Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
Lv Zheng | a8d4fc2 | 2015-02-05 16:27:35 +0800 | [diff] [blame] | 3 | * ec.c - ACPI Embedded Controller Driver (v3) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Lv Zheng | a8d4fc2 | 2015-02-05 16:27:35 +0800 | [diff] [blame] | 5 | * Copyright (C) 2001-2015 Intel Corporation |
| 6 | * Author: 2014, 2015 Lv Zheng <lv.zheng@intel.com> |
Lv Zheng | 4a3f6b5 | 2014-06-15 08:42:19 +0800 | [diff] [blame] | 7 | * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
| 8 | * 2006 Denis Sadykov <denis.m.sadykov@intel.com> |
| 9 | * 2004 Luming Yu <luming.yu@intel.com> |
| 10 | * 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 11 | * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 12 | * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | */ |
| 14 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 15 | /* Uncomment next line to get verbose printout */ |
Márton Németh | d772b3b | 2008-01-23 22:34:09 -0500 | [diff] [blame] | 16 | /* #define DEBUG */ |
Vincent Legoll | b6aeab4 | 2017-05-20 20:38:13 +0200 | [diff] [blame] | 17 | #define pr_fmt(fmt) "ACPI: EC: " fmt |
Márton Németh | d772b3b | 2008-01-23 22:34:09 -0500 | [diff] [blame] | 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/types.h> |
| 23 | #include <linux/delay.h> |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame] | 24 | #include <linux/interrupt.h> |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 25 | #include <linux/list.h> |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 26 | #include <linux/spinlock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/slab.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 28 | #include <linux/acpi.h> |
Len Brown | eb27cae | 2009-07-06 23:40:19 -0400 | [diff] [blame] | 29 | #include <linux/dmi.h> |
Lv Zheng | 8b48463 | 2013-12-03 08:49:16 +0800 | [diff] [blame] | 30 | #include <asm/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Thomas Renninger | 1195a09 | 2010-07-16 13:11:31 +0200 | [diff] [blame] | 32 | #include "internal.h" |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #define ACPI_EC_CLASS "embedded_controller" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
| 36 | #define ACPI_EC_FILE_INFO "info" |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 37 | |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 38 | /* EC status register */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
| 40 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ |
Lv Zheng | dd43de2 | 2014-06-15 08:42:42 +0800 | [diff] [blame] | 41 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame] | 42 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
Alexey Starikovskiy | 4350933 | 2007-05-29 16:42:57 +0400 | [diff] [blame] | 44 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 45 | /* |
| 46 | * The SCI_EVT clearing timing is not defined by the ACPI specification. |
| 47 | * This leads to lots of practical timing issues for the host EC driver. |
| 48 | * The following variations are defined (from the target EC firmware's |
| 49 | * perspective): |
| 50 | * STATUS: After indicating SCI_EVT edge triggered IRQ to the host, the |
| 51 | * target can clear SCI_EVT at any time so long as the host can see |
| 52 | * the indication by reading the status register (EC_SC). So the |
| 53 | * host should re-check SCI_EVT after the first time the SCI_EVT |
| 54 | * indication is seen, which is the same time the query request |
| 55 | * (QR_EC) is written to the command register (EC_CMD). SCI_EVT set |
| 56 | * at any later time could indicate another event. Normally such |
| 57 | * kind of EC firmware has implemented an event queue and will |
| 58 | * return 0x00 to indicate "no outstanding event". |
| 59 | * QUERY: After seeing the query request (QR_EC) written to the command |
| 60 | * register (EC_CMD) by the host and having prepared the responding |
| 61 | * event value in the data register (EC_DATA), the target can safely |
| 62 | * clear SCI_EVT because the target can confirm that the current |
| 63 | * event is being handled by the host. The host then should check |
| 64 | * SCI_EVT right after reading the event response from the data |
| 65 | * register (EC_DATA). |
| 66 | * EVENT: After seeing the event response read from the data register |
| 67 | * (EC_DATA) by the host, the target can clear SCI_EVT. As the |
| 68 | * target requires time to notice the change in the data register |
| 69 | * (EC_DATA), the host may be required to wait additional guarding |
| 70 | * time before checking the SCI_EVT again. Such guarding may not be |
| 71 | * necessary if the host is notified via another IRQ. |
| 72 | */ |
| 73 | #define ACPI_EC_EVT_TIMING_STATUS 0x00 |
| 74 | #define ACPI_EC_EVT_TIMING_QUERY 0x01 |
| 75 | #define ACPI_EC_EVT_TIMING_EVENT 0x02 |
| 76 | |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 77 | /* EC commands */ |
Alexey Starikovskiy | 3261ff4 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 78 | enum ec_command { |
Alexey Starikovskiy | 6ccedb1 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 79 | ACPI_EC_COMMAND_READ = 0x80, |
| 80 | ACPI_EC_COMMAND_WRITE = 0x81, |
| 81 | ACPI_EC_BURST_ENABLE = 0x82, |
| 82 | ACPI_EC_BURST_DISABLE = 0x83, |
| 83 | ACPI_EC_COMMAND_QUERY = 0x84, |
Alexey Starikovskiy | 3261ff4 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 84 | }; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 85 | |
Alexey Starikovskiy | 5c40641 | 2006-12-07 18:42:16 +0300 | [diff] [blame] | 86 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 87 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 88 | #define ACPI_EC_UDELAY_POLL 550 /* Wait 1ms for EC transaction polling */ |
Kieran Clancy | ad332c8 | 2014-03-01 00:42:28 +1030 | [diff] [blame] | 89 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
| 90 | * when trying to clear the EC */ |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 91 | #define ACPI_EC_MAX_QUERIES 16 /* Maximum number of parallel queries */ |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 92 | |
Alexey Starikovskiy | 080e412 | 2007-10-22 14:18:30 +0400 | [diff] [blame] | 93 | enum { |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 94 | EC_FLAGS_QUERY_ENABLED, /* Query is enabled */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 95 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 96 | EC_FLAGS_QUERY_GUARDING, /* Guard for SCI_EVT check */ |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 97 | EC_FLAGS_GPE_HANDLER_INSTALLED, /* GPE handler installed */ |
| 98 | EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */ |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 99 | EC_FLAGS_EVT_HANDLER_INSTALLED, /* _Qxx handlers installed */ |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 100 | EC_FLAGS_STARTED, /* Driver is started */ |
| 101 | EC_FLAGS_STOPPED, /* Driver is stopped */ |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 102 | EC_FLAGS_GPE_MASKED, /* GPE masked */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | }; |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 104 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 105 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
| 106 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ |
| 107 | |
Thomas Renninger | 7a18e96 | 2010-10-21 18:24:57 +0200 | [diff] [blame] | 108 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
| 109 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; |
| 110 | module_param(ec_delay, uint, 0644); |
| 111 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); |
| 112 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 113 | static unsigned int ec_max_queries __read_mostly = ACPI_EC_MAX_QUERIES; |
| 114 | module_param(ec_max_queries, uint, 0644); |
| 115 | MODULE_PARM_DESC(ec_max_queries, "Maximum parallel _Qxx evaluations"); |
| 116 | |
Lv Zheng | 15de603 | 2015-05-15 14:16:48 +0800 | [diff] [blame] | 117 | static bool ec_busy_polling __read_mostly; |
| 118 | module_param(ec_busy_polling, bool, 0644); |
| 119 | MODULE_PARM_DESC(ec_busy_polling, "Use busy polling to advance EC transaction"); |
| 120 | |
| 121 | static unsigned int ec_polling_guard __read_mostly = ACPI_EC_UDELAY_POLL; |
| 122 | module_param(ec_polling_guard, uint, 0644); |
| 123 | MODULE_PARM_DESC(ec_polling_guard, "Guard time(us) between EC accesses in polling modes"); |
| 124 | |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 125 | static unsigned int ec_event_clearing __read_mostly = ACPI_EC_EVT_TIMING_QUERY; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 126 | |
Feng Tang | a520d52 | 2012-09-28 15:22:00 +0800 | [diff] [blame] | 127 | /* |
| 128 | * If the number of false interrupts per one transaction exceeds |
| 129 | * this threshold, will think there is a GPE storm happened and |
| 130 | * will disable the GPE for normal transaction. |
| 131 | */ |
| 132 | static unsigned int ec_storm_threshold __read_mostly = 8; |
| 133 | module_param(ec_storm_threshold, uint, 0644); |
| 134 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); |
| 135 | |
Lv Zheng | 9c40f95 | 2017-07-12 11:09:17 +0800 | [diff] [blame] | 136 | static bool ec_freeze_events __read_mostly = false; |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 137 | module_param(ec_freeze_events, bool, 0644); |
| 138 | MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); |
| 139 | |
Rafael J. Wysocki | 7638063 | 2017-07-19 14:41:58 +0200 | [diff] [blame] | 140 | static bool ec_no_wakeup __read_mostly; |
| 141 | module_param(ec_no_wakeup, bool, 0644); |
| 142 | MODULE_PARM_DESC(ec_no_wakeup, "Do not wake up from suspend-to-idle"); |
| 143 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 144 | struct acpi_ec_query_handler { |
| 145 | struct list_head node; |
| 146 | acpi_ec_query_func func; |
| 147 | acpi_handle handle; |
| 148 | void *data; |
| 149 | u8 query_bit; |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 150 | struct kref kref; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 151 | }; |
| 152 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 153 | struct transaction { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 154 | const u8 *wdata; |
| 155 | u8 *rdata; |
| 156 | unsigned short irq_count; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 157 | u8 command; |
Alexey Starikovskiy | a2f93ae | 2008-11-12 01:40:19 +0300 | [diff] [blame] | 158 | u8 wi; |
| 159 | u8 ri; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 160 | u8 wlen; |
| 161 | u8 rlen; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 162 | u8 flags; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 163 | }; |
| 164 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 165 | struct acpi_ec_query { |
| 166 | struct transaction transaction; |
| 167 | struct work_struct work; |
| 168 | struct acpi_ec_query_handler *handler; |
| 169 | }; |
| 170 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 171 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 172 | static void advance_transaction(struct acpi_ec *ec); |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 173 | static void acpi_ec_event_handler(struct work_struct *work); |
| 174 | static void acpi_ec_event_processor(struct work_struct *work); |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 175 | |
Rafael J. Wysocki | a9c3076 | 2019-02-01 10:57:01 +0100 | [diff] [blame] | 176 | struct acpi_ec *first_ec; |
Thomas Renninger | 1195a09 | 2010-07-16 13:11:31 +0200 | [diff] [blame] | 177 | EXPORT_SYMBOL(first_ec); |
Rafael J. Wysocki | a9c3076 | 2019-02-01 10:57:01 +0100 | [diff] [blame] | 178 | |
| 179 | static struct acpi_ec *boot_ec; |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 180 | static bool boot_ec_is_ecdt = false; |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 181 | static struct workqueue_struct *ec_query_wq; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 182 | |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 183 | static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 184 | static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ |
Chris Chiu | 440f53d | 2017-06-15 09:41:47 +0800 | [diff] [blame] | 185 | static int EC_FLAGS_IGNORE_DSDT_GPE; /* Needs ECDT GPE as correction setting */ |
Zhang Rui | b6a3e14 | 2019-02-01 14:13:41 +0800 | [diff] [blame] | 186 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
Alexey Starikovskiy | 5423a0c | 2009-02-21 12:18:13 -0500 | [diff] [blame] | 187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | /* -------------------------------------------------------------------------- |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 189 | * Logging/Debugging |
| 190 | * -------------------------------------------------------------------------- */ |
| 191 | |
| 192 | /* |
| 193 | * Splitters used by the developers to track the boundary of the EC |
| 194 | * handling processes. |
| 195 | */ |
| 196 | #ifdef DEBUG |
| 197 | #define EC_DBG_SEP " " |
| 198 | #define EC_DBG_DRV "+++++" |
| 199 | #define EC_DBG_STM "=====" |
| 200 | #define EC_DBG_REQ "*****" |
| 201 | #define EC_DBG_EVT "#####" |
| 202 | #else |
| 203 | #define EC_DBG_SEP "" |
| 204 | #define EC_DBG_DRV |
| 205 | #define EC_DBG_STM |
| 206 | #define EC_DBG_REQ |
| 207 | #define EC_DBG_EVT |
| 208 | #endif |
| 209 | |
| 210 | #define ec_log_raw(fmt, ...) \ |
| 211 | pr_info(fmt "\n", ##__VA_ARGS__) |
| 212 | #define ec_dbg_raw(fmt, ...) \ |
| 213 | pr_debug(fmt "\n", ##__VA_ARGS__) |
| 214 | #define ec_log(filter, fmt, ...) \ |
| 215 | ec_log_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) |
| 216 | #define ec_dbg(filter, fmt, ...) \ |
| 217 | ec_dbg_raw(filter EC_DBG_SEP fmt EC_DBG_SEP filter, ##__VA_ARGS__) |
| 218 | |
| 219 | #define ec_log_drv(fmt, ...) \ |
| 220 | ec_log(EC_DBG_DRV, fmt, ##__VA_ARGS__) |
| 221 | #define ec_dbg_drv(fmt, ...) \ |
| 222 | ec_dbg(EC_DBG_DRV, fmt, ##__VA_ARGS__) |
| 223 | #define ec_dbg_stm(fmt, ...) \ |
| 224 | ec_dbg(EC_DBG_STM, fmt, ##__VA_ARGS__) |
| 225 | #define ec_dbg_req(fmt, ...) \ |
| 226 | ec_dbg(EC_DBG_REQ, fmt, ##__VA_ARGS__) |
| 227 | #define ec_dbg_evt(fmt, ...) \ |
| 228 | ec_dbg(EC_DBG_EVT, fmt, ##__VA_ARGS__) |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 229 | #define ec_dbg_ref(ec, fmt, ...) \ |
| 230 | ec_dbg_raw("%lu: " fmt, ec->reference_count, ## __VA_ARGS__) |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 231 | |
| 232 | /* -------------------------------------------------------------------------- |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 233 | * Device Flags |
| 234 | * -------------------------------------------------------------------------- */ |
| 235 | |
| 236 | static bool acpi_ec_started(struct acpi_ec *ec) |
| 237 | { |
| 238 | return test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 239 | !test_bit(EC_FLAGS_STOPPED, &ec->flags); |
| 240 | } |
| 241 | |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 242 | static bool acpi_ec_event_enabled(struct acpi_ec *ec) |
| 243 | { |
| 244 | /* |
| 245 | * There is an OSPM early stage logic. During the early stages |
| 246 | * (boot/resume), OSPMs shouldn't enable the event handling, only |
| 247 | * the EC transactions are allowed to be performed. |
| 248 | */ |
| 249 | if (!test_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 250 | return false; |
| 251 | /* |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 252 | * However, disabling the event handling is experimental for late |
| 253 | * stage (suspend), and is controlled by the boot parameter of |
| 254 | * "ec_freeze_events": |
| 255 | * 1. true: The EC event handling is disabled before entering |
| 256 | * the noirq stage. |
| 257 | * 2. false: The EC event handling is automatically disabled as |
| 258 | * soon as the EC driver is stopped. |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 259 | */ |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 260 | if (ec_freeze_events) |
| 261 | return acpi_ec_started(ec); |
| 262 | else |
| 263 | return test_bit(EC_FLAGS_STARTED, &ec->flags); |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 264 | } |
| 265 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 266 | static bool acpi_ec_flushed(struct acpi_ec *ec) |
| 267 | { |
| 268 | return ec->reference_count == 1; |
| 269 | } |
| 270 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 271 | /* -------------------------------------------------------------------------- |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 272 | * EC Registers |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 273 | * -------------------------------------------------------------------------- */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 275 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 277 | u8 x = inb(ec->command_addr); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 278 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 279 | ec_dbg_raw("EC_SC(R) = 0x%2.2x " |
| 280 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d", |
| 281 | x, |
| 282 | !!(x & ACPI_EC_FLAG_SCI), |
| 283 | !!(x & ACPI_EC_FLAG_BURST), |
| 284 | !!(x & ACPI_EC_FLAG_CMD), |
| 285 | !!(x & ACPI_EC_FLAG_IBF), |
| 286 | !!(x & ACPI_EC_FLAG_OBF)); |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 287 | return x; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 290 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 291 | { |
Márton Németh | 3ebe08a | 2007-11-21 03:23:26 +0300 | [diff] [blame] | 292 | u8 x = inb(ec->data_addr); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 293 | |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 294 | ec->timestamp = jiffies; |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 295 | ec_dbg_raw("EC_DATA(R) = 0x%2.2x", x); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 296 | return x; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 297 | } |
| 298 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 299 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 300 | { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 301 | ec_dbg_raw("EC_SC(W) = 0x%2.2x", command); |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 302 | outb(command, ec->command_addr); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 303 | ec->timestamp = jiffies; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 304 | } |
| 305 | |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 306 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 307 | { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 308 | ec_dbg_raw("EC_DATA(W) = 0x%2.2x", data); |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 309 | outb(data, ec->data_addr); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 310 | ec->timestamp = jiffies; |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 311 | } |
| 312 | |
Lv Zheng | 4625d75 | 2017-06-14 13:59:18 +0800 | [diff] [blame] | 313 | #if defined(DEBUG) || defined(CONFIG_DYNAMIC_DEBUG) |
Lv Zheng | e34c0e2 | 2014-10-14 14:23:49 +0800 | [diff] [blame] | 314 | static const char *acpi_ec_cmd_string(u8 cmd) |
| 315 | { |
| 316 | switch (cmd) { |
| 317 | case 0x80: |
| 318 | return "RD_EC"; |
| 319 | case 0x81: |
| 320 | return "WR_EC"; |
| 321 | case 0x82: |
| 322 | return "BE_EC"; |
| 323 | case 0x83: |
| 324 | return "BD_EC"; |
| 325 | case 0x84: |
| 326 | return "QR_EC"; |
| 327 | } |
| 328 | return "UNKNOWN"; |
| 329 | } |
| 330 | #else |
| 331 | #define acpi_ec_cmd_string(cmd) "UNDEF" |
| 332 | #endif |
| 333 | |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 334 | /* -------------------------------------------------------------------------- |
| 335 | * GPE Registers |
| 336 | * -------------------------------------------------------------------------- */ |
| 337 | |
| 338 | static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) |
| 339 | { |
| 340 | acpi_event_status gpe_status = 0; |
| 341 | |
| 342 | (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); |
Lv Zheng | 7c0b259 | 2015-05-15 14:16:17 +0800 | [diff] [blame] | 343 | return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) |
| 347 | { |
| 348 | if (open) |
| 349 | acpi_enable_gpe(NULL, ec->gpe); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 350 | else { |
| 351 | BUG_ON(ec->reference_count < 1); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 352 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 353 | } |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 354 | if (acpi_ec_is_gpe_raised(ec)) { |
| 355 | /* |
| 356 | * On some platforms, EN=1 writes cannot trigger GPE. So |
| 357 | * software need to manually trigger a pseudo GPE event on |
| 358 | * EN=1 writes. |
| 359 | */ |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 360 | ec_dbg_raw("Polling quirk"); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 361 | advance_transaction(ec); |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) |
| 366 | { |
| 367 | if (close) |
| 368 | acpi_disable_gpe(NULL, ec->gpe); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 369 | else { |
| 370 | BUG_ON(ec->reference_count < 1); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 371 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 372 | } |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 373 | } |
| 374 | |
| 375 | static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) |
| 376 | { |
| 377 | /* |
| 378 | * GPE STS is a W1C register, which means: |
| 379 | * 1. Software can clear it without worrying about clearing other |
| 380 | * GPEs' STS bits when the hardware sets them in parallel. |
| 381 | * 2. As long as software can ensure only clearing it when it is |
| 382 | * set, hardware won't set it in parallel. |
| 383 | * So software can clear GPE in any contexts. |
| 384 | * Warning: do not move the check into advance_transaction() as the |
| 385 | * EC commands will be sent without GPE raised. |
| 386 | */ |
| 387 | if (!acpi_ec_is_gpe_raised(ec)) |
| 388 | return; |
| 389 | acpi_clear_gpe(NULL, ec->gpe); |
| 390 | } |
| 391 | |
| 392 | /* -------------------------------------------------------------------------- |
| 393 | * Transaction Management |
| 394 | * -------------------------------------------------------------------------- */ |
| 395 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 396 | static void acpi_ec_submit_request(struct acpi_ec *ec) |
| 397 | { |
| 398 | ec->reference_count++; |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 399 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
| 400 | ec->reference_count == 1) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 401 | acpi_ec_enable_gpe(ec, true); |
| 402 | } |
| 403 | |
| 404 | static void acpi_ec_complete_request(struct acpi_ec *ec) |
| 405 | { |
| 406 | bool flushed = false; |
| 407 | |
| 408 | ec->reference_count--; |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 409 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && |
| 410 | ec->reference_count == 0) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 411 | acpi_ec_disable_gpe(ec, true); |
| 412 | flushed = acpi_ec_flushed(ec); |
| 413 | if (flushed) |
| 414 | wake_up(&ec->wait); |
| 415 | } |
| 416 | |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 417 | static void acpi_ec_mask_gpe(struct acpi_ec *ec) |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 418 | { |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 419 | if (!test_bit(EC_FLAGS_GPE_MASKED, &ec->flags)) { |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 420 | acpi_ec_disable_gpe(ec, false); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 421 | ec_dbg_drv("Polling enabled"); |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 422 | set_bit(EC_FLAGS_GPE_MASKED, &ec->flags); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 423 | } |
| 424 | } |
| 425 | |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 426 | static void acpi_ec_unmask_gpe(struct acpi_ec *ec) |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 427 | { |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 428 | if (test_bit(EC_FLAGS_GPE_MASKED, &ec->flags)) { |
| 429 | clear_bit(EC_FLAGS_GPE_MASKED, &ec->flags); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 430 | acpi_ec_enable_gpe(ec, false); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 431 | ec_dbg_drv("Polling disabled"); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 432 | } |
| 433 | } |
| 434 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 435 | /* |
| 436 | * acpi_ec_submit_flushable_request() - Increase the reference count unless |
| 437 | * the flush operation is not in |
| 438 | * progress |
| 439 | * @ec: the EC device |
| 440 | * |
| 441 | * This function must be used before taking a new action that should hold |
| 442 | * the reference count. If this function returns false, then the action |
| 443 | * must be discarded or it will prevent the flush operation from being |
| 444 | * completed. |
| 445 | */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 446 | static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 447 | { |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 448 | if (!acpi_ec_started(ec)) |
| 449 | return false; |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 450 | acpi_ec_submit_request(ec); |
| 451 | return true; |
| 452 | } |
| 453 | |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 454 | static void acpi_ec_submit_query(struct acpi_ec *ec) |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 455 | { |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 456 | acpi_ec_mask_gpe(ec); |
Lv Zheng | 1ab69f2 | 2017-06-14 13:59:09 +0800 | [diff] [blame] | 457 | if (!acpi_ec_event_enabled(ec)) |
| 458 | return; |
| 459 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 460 | ec_dbg_evt("Command(%s) submitted/blocked", |
| 461 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
| 462 | ec->nr_pending_queries++; |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 463 | schedule_work(&ec->work); |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 464 | } |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 465 | } |
| 466 | |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 467 | static void acpi_ec_complete_query(struct acpi_ec *ec) |
Lv Zheng | f252cb0 | 2015-02-06 08:58:10 +0800 | [diff] [blame] | 468 | { |
Lv Zheng | 1ab69f2 | 2017-06-14 13:59:09 +0800 | [diff] [blame] | 469 | if (test_and_clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 470 | ec_dbg_evt("Command(%s) unblocked", |
| 471 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 472 | acpi_ec_unmask_gpe(ec); |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 473 | } |
| 474 | |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 475 | static inline void __acpi_ec_enable_event(struct acpi_ec *ec) |
| 476 | { |
| 477 | if (!test_and_set_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 478 | ec_log_drv("event unblocked"); |
Lv Zheng | 53c5eaa | 2017-09-26 16:54:03 +0800 | [diff] [blame] | 479 | /* |
| 480 | * Unconditionally invoke this once after enabling the event |
| 481 | * handling mechanism to detect the pending events. |
| 482 | */ |
| 483 | advance_transaction(ec); |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | static inline void __acpi_ec_disable_event(struct acpi_ec *ec) |
| 487 | { |
| 488 | if (test_and_clear_bit(EC_FLAGS_QUERY_ENABLED, &ec->flags)) |
| 489 | ec_log_drv("event blocked"); |
| 490 | } |
| 491 | |
Zhang Rui | b6a3e14 | 2019-02-01 14:13:41 +0800 | [diff] [blame] | 492 | /* |
| 493 | * Process _Q events that might have accumulated in the EC. |
| 494 | * Run with locked ec mutex. |
| 495 | */ |
| 496 | static void acpi_ec_clear(struct acpi_ec *ec) |
| 497 | { |
| 498 | int i, status; |
| 499 | u8 value = 0; |
| 500 | |
| 501 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { |
| 502 | status = acpi_ec_query(ec, &value); |
| 503 | if (status || !value) |
| 504 | break; |
| 505 | } |
| 506 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) |
| 507 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); |
| 508 | else |
| 509 | pr_info("%d stale EC events cleared\n", i); |
| 510 | } |
| 511 | |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 512 | static void acpi_ec_enable_event(struct acpi_ec *ec) |
| 513 | { |
| 514 | unsigned long flags; |
| 515 | |
| 516 | spin_lock_irqsave(&ec->lock, flags); |
| 517 | if (acpi_ec_started(ec)) |
| 518 | __acpi_ec_enable_event(ec); |
| 519 | spin_unlock_irqrestore(&ec->lock, flags); |
Zhang Rui | b6a3e14 | 2019-02-01 14:13:41 +0800 | [diff] [blame] | 520 | |
| 521 | /* Drain additional events if hardware requires that */ |
| 522 | if (EC_FLAGS_CLEAR_ON_RESUME) |
| 523 | acpi_ec_clear(ec); |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 524 | } |
| 525 | |
Eric Biggers | eab05ec | 2016-10-05 10:33:16 -0700 | [diff] [blame] | 526 | #ifdef CONFIG_PM_SLEEP |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 527 | static bool acpi_ec_query_flushed(struct acpi_ec *ec) |
| 528 | { |
| 529 | bool flushed; |
| 530 | unsigned long flags; |
| 531 | |
| 532 | spin_lock_irqsave(&ec->lock, flags); |
| 533 | flushed = !ec->nr_pending_queries; |
| 534 | spin_unlock_irqrestore(&ec->lock, flags); |
| 535 | return flushed; |
| 536 | } |
| 537 | |
| 538 | static void __acpi_ec_flush_event(struct acpi_ec *ec) |
| 539 | { |
| 540 | /* |
| 541 | * When ec_freeze_events is true, we need to flush events in |
| 542 | * the proper position before entering the noirq stage. |
| 543 | */ |
| 544 | wait_event(ec->wait, acpi_ec_query_flushed(ec)); |
| 545 | if (ec_query_wq) |
| 546 | flush_workqueue(ec_query_wq); |
| 547 | } |
| 548 | |
| 549 | static void acpi_ec_disable_event(struct acpi_ec *ec) |
| 550 | { |
| 551 | unsigned long flags; |
| 552 | |
| 553 | spin_lock_irqsave(&ec->lock, flags); |
| 554 | __acpi_ec_disable_event(ec); |
| 555 | spin_unlock_irqrestore(&ec->lock, flags); |
| 556 | __acpi_ec_flush_event(ec); |
| 557 | } |
Rafael J. Wysocki | 880a662 | 2017-07-20 03:43:12 +0200 | [diff] [blame] | 558 | |
| 559 | void acpi_ec_flush_work(void) |
| 560 | { |
| 561 | if (first_ec) |
| 562 | __acpi_ec_flush_event(first_ec); |
| 563 | |
| 564 | flush_scheduled_work(); |
| 565 | } |
Eric Biggers | eab05ec | 2016-10-05 10:33:16 -0700 | [diff] [blame] | 566 | #endif /* CONFIG_PM_SLEEP */ |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 567 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 568 | static bool acpi_ec_guard_event(struct acpi_ec *ec) |
| 569 | { |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 570 | bool guarded = true; |
| 571 | unsigned long flags; |
| 572 | |
| 573 | spin_lock_irqsave(&ec->lock, flags); |
| 574 | /* |
| 575 | * If firmware SCI_EVT clearing timing is "event", we actually |
| 576 | * don't know when the SCI_EVT will be cleared by firmware after |
| 577 | * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an |
| 578 | * acceptable period. |
| 579 | * |
| 580 | * The guarding period begins when EC_FLAGS_QUERY_PENDING is |
| 581 | * flagged, which means SCI_EVT check has just been performed. |
| 582 | * But if the current transaction is ACPI_EC_COMMAND_QUERY, the |
| 583 | * guarding should have already been performed (via |
| 584 | * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the |
| 585 | * ACPI_EC_COMMAND_QUERY transaction can be transitioned into |
| 586 | * ACPI_EC_COMMAND_POLL state immediately. |
| 587 | */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 588 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
| 589 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || |
| 590 | !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || |
| 591 | (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 592 | guarded = false; |
| 593 | spin_unlock_irqrestore(&ec->lock, flags); |
| 594 | return guarded; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 595 | } |
| 596 | |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 597 | static int ec_transaction_polled(struct acpi_ec *ec) |
| 598 | { |
| 599 | unsigned long flags; |
| 600 | int ret = 0; |
| 601 | |
| 602 | spin_lock_irqsave(&ec->lock, flags); |
| 603 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_POLL)) |
| 604 | ret = 1; |
| 605 | spin_unlock_irqrestore(&ec->lock, flags); |
| 606 | return ret; |
| 607 | } |
| 608 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 609 | static int ec_transaction_completed(struct acpi_ec *ec) |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 610 | { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 611 | unsigned long flags; |
| 612 | int ret = 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 613 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 614 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 615 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 616 | ret = 1; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 617 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 618 | return ret; |
| 619 | } |
Denis M. Sadykov | 7c6db5e | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 620 | |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 621 | static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) |
| 622 | { |
| 623 | ec->curr->flags |= flag; |
| 624 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 625 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && |
| 626 | flag == ACPI_EC_COMMAND_POLL) |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 627 | acpi_ec_complete_query(ec); |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 628 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && |
| 629 | flag == ACPI_EC_COMMAND_COMPLETE) |
| 630 | acpi_ec_complete_query(ec); |
| 631 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
| 632 | flag == ACPI_EC_COMMAND_COMPLETE) |
| 633 | set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 634 | } |
| 635 | } |
| 636 | |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 637 | static void advance_transaction(struct acpi_ec *ec) |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 638 | { |
Puneet Kumar | 36b1587 | 2013-11-15 11:41:29 -0800 | [diff] [blame] | 639 | struct transaction *t; |
Lv Zheng | 66b42b7 | 2014-06-15 08:41:17 +0800 | [diff] [blame] | 640 | u8 status; |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 641 | bool wakeup = false; |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 642 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 643 | ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", |
| 644 | smp_processor_id()); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 645 | /* |
| 646 | * By always clearing STS before handling all indications, we can |
| 647 | * ensure a hardware STS 0->1 change after this clearing can always |
| 648 | * trigger a GPE interrupt. |
| 649 | */ |
| 650 | acpi_ec_clear_gpe(ec); |
Lv Zheng | 66b42b7 | 2014-06-15 08:41:17 +0800 | [diff] [blame] | 651 | status = acpi_ec_read_status(ec); |
Puneet Kumar | 36b1587 | 2013-11-15 11:41:29 -0800 | [diff] [blame] | 652 | t = ec->curr; |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 653 | /* |
| 654 | * Another IRQ or a guarded polling mode advancement is detected, |
| 655 | * the next QR_EC submission is then allowed. |
| 656 | */ |
| 657 | if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { |
| 658 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && |
Lv Zheng | 66db383 | 2015-06-11 13:21:51 +0800 | [diff] [blame] | 659 | (!ec->nr_pending_queries || |
| 660 | test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 661 | clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); |
| 662 | acpi_ec_complete_query(ec); |
| 663 | } |
| 664 | } |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 665 | if (!t) |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 666 | goto err; |
| 667 | if (t->flags & ACPI_EC_COMMAND_POLL) { |
| 668 | if (t->wlen > t->wi) { |
| 669 | if ((status & ACPI_EC_FLAG_IBF) == 0) |
| 670 | acpi_ec_write_data(ec, t->wdata[t->wi++]); |
| 671 | else |
| 672 | goto err; |
| 673 | } else if (t->rlen > t->ri) { |
| 674 | if ((status & ACPI_EC_FLAG_OBF) == 1) { |
| 675 | t->rdata[t->ri++] = acpi_ec_read_data(ec); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 676 | if (t->rlen == t->ri) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 677 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 678 | if (t->command == ACPI_EC_COMMAND_QUERY) |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 679 | ec_dbg_evt("Command(%s) completed by hardware", |
| 680 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 681 | wakeup = true; |
| 682 | } |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 683 | } else |
| 684 | goto err; |
| 685 | } else if (t->wlen == t->wi && |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 686 | (status & ACPI_EC_FLAG_IBF) == 0) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 687 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 688 | wakeup = true; |
| 689 | } |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 690 | goto out; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 691 | } else { |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 692 | if (EC_FLAGS_QUERY_HANDSHAKE && |
| 693 | !(status & ACPI_EC_FLAG_SCI) && |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 694 | (t->command == ACPI_EC_COMMAND_QUERY)) { |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 695 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 696 | t->rdata[t->ri++] = 0x00; |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 697 | ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 698 | ec_dbg_evt("Command(%s) completed by software", |
| 699 | acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); |
Lv Zheng | 3afcf2e | 2014-08-21 14:41:13 +0800 | [diff] [blame] | 700 | wakeup = true; |
| 701 | } else if ((status & ACPI_EC_FLAG_IBF) == 0) { |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 702 | acpi_ec_write_cmd(ec, t->command); |
Lv Zheng | f8b8eb7 | 2015-06-11 13:21:23 +0800 | [diff] [blame] | 703 | ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 704 | } else |
Alexey Starikovskiy | dd15f8c | 2008-11-08 21:42:30 +0300 | [diff] [blame] | 705 | goto err; |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 706 | goto out; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 707 | } |
Alexey Starikovskiy | dd15f8c | 2008-11-08 21:42:30 +0300 | [diff] [blame] | 708 | err: |
Feng Tang | a3cd8d2 | 2012-10-23 01:30:12 +0200 | [diff] [blame] | 709 | /* |
| 710 | * If SCI bit is set, then don't think it's a false IRQ |
| 711 | * otherwise will take a not handled IRQ as a false one. |
| 712 | */ |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 713 | if (!(status & ACPI_EC_FLAG_SCI)) { |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 714 | if (in_interrupt() && t) { |
| 715 | if (t->irq_count < ec_storm_threshold) |
| 716 | ++t->irq_count; |
| 717 | /* Allow triggering on 0 threshold */ |
| 718 | if (t->irq_count == ec_storm_threshold) |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 719 | acpi_ec_mask_gpe(ec); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 720 | } |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 721 | } |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 722 | out: |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 723 | if (status & ACPI_EC_FLAG_SCI) |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 724 | acpi_ec_submit_query(ec); |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 725 | if (wakeup && in_interrupt()) |
| 726 | wake_up(&ec->wait); |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 727 | } |
Feng Tang | a3cd8d2 | 2012-10-23 01:30:12 +0200 | [diff] [blame] | 728 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 729 | static void start_transaction(struct acpi_ec *ec) |
| 730 | { |
| 731 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; |
| 732 | ec->curr->flags = 0; |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | static int ec_guard(struct acpi_ec *ec) |
| 736 | { |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 737 | unsigned long guard = usecs_to_jiffies(ec->polling_guard); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 738 | unsigned long timeout = ec->timestamp + guard; |
| 739 | |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 740 | /* Ensure guarding period before polling EC status */ |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 741 | do { |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 742 | if (ec->busy_polling) { |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 743 | /* Perform busy polling */ |
| 744 | if (ec_transaction_completed(ec)) |
| 745 | return 0; |
| 746 | udelay(jiffies_to_usecs(guard)); |
| 747 | } else { |
| 748 | /* |
| 749 | * Perform wait polling |
Lv Zheng | 6119754 | 2015-09-24 14:54:54 +0800 | [diff] [blame] | 750 | * 1. Wait the transaction to be completed by the |
| 751 | * GPE handler after the transaction enters |
| 752 | * ACPI_EC_COMMAND_POLL state. |
| 753 | * 2. A special guarding logic is also required |
| 754 | * for event clearing mode "event" before the |
| 755 | * transaction enters ACPI_EC_COMMAND_POLL |
| 756 | * state. |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 757 | */ |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 758 | if (!ec_transaction_polled(ec) && |
| 759 | !acpi_ec_guard_event(ec)) |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 760 | break; |
| 761 | if (wait_event_timeout(ec->wait, |
| 762 | ec_transaction_completed(ec), |
| 763 | guard)) |
| 764 | return 0; |
| 765 | } |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 766 | } while (time_before(jiffies, timeout)); |
| 767 | return -ETIME; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 768 | } |
| 769 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 770 | static int ec_poll(struct acpi_ec *ec) |
Alexey Starikovskiy | 845625c | 2008-03-21 17:07:03 +0300 | [diff] [blame] | 771 | { |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 772 | unsigned long flags; |
Lan Tianyu | 28fe5c8 | 2013-05-06 03:23:40 +0000 | [diff] [blame] | 773 | int repeat = 5; /* number of command restarts */ |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 774 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 775 | while (repeat--) { |
| 776 | unsigned long delay = jiffies + |
Thomas Renninger | 7a18e96 | 2010-10-21 18:24:57 +0200 | [diff] [blame] | 777 | msecs_to_jiffies(ec_delay); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 778 | do { |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 779 | if (!ec_guard(ec)) |
| 780 | return 0; |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 781 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 782 | advance_transaction(ec); |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 783 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 784 | } while (time_before(jiffies, delay)); |
Lan Tianyu | 16a26e8 | 2013-09-12 03:32:04 -0400 | [diff] [blame] | 785 | pr_debug("controller reset, restart transaction\n"); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 786 | spin_lock_irqsave(&ec->lock, flags); |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 787 | start_transaction(ec); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 788 | spin_unlock_irqrestore(&ec->lock, flags); |
Alexey Starikovskiy | af3fd14 | 2006-12-07 18:42:16 +0300 | [diff] [blame] | 789 | } |
Alexey Starikovskiy | b77d81b | 2008-03-21 17:07:15 +0300 | [diff] [blame] | 790 | return -ETIME; |
Dmitry Torokhov | 451566f | 2005-03-19 01:10:05 -0500 | [diff] [blame] | 791 | } |
| 792 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 793 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 794 | struct transaction *t) |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 795 | { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 796 | unsigned long tmp; |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 797 | int ret = 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 798 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 799 | /* start transaction */ |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 800 | spin_lock_irqsave(&ec->lock, tmp); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 801 | /* Enable GPE for command processing (IBF=0/OBF=1) */ |
Rafael J. Wysocki | 37d1139 | 2015-02-11 17:35:05 +0100 | [diff] [blame] | 802 | if (!acpi_ec_submit_flushable_request(ec)) { |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 803 | ret = -EINVAL; |
| 804 | goto unlock; |
| 805 | } |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 806 | ec_dbg_ref(ec, "Increase command"); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 807 | /* following two actions should be kept atomic */ |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 808 | ec->curr = t; |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 809 | ec_dbg_req("Command(%s) started", acpi_ec_cmd_string(t->command)); |
Alexey Starikovskiy | a2f93ae | 2008-11-12 01:40:19 +0300 | [diff] [blame] | 810 | start_transaction(ec); |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 811 | spin_unlock_irqrestore(&ec->lock, tmp); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 812 | |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 813 | ret = ec_poll(ec); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 814 | |
Lv Zheng | df9ff91 | 2014-10-29 11:33:43 +0800 | [diff] [blame] | 815 | spin_lock_irqsave(&ec->lock, tmp); |
Lv Zheng | e1d4d90 | 2015-02-06 08:58:05 +0800 | [diff] [blame] | 816 | if (t->irq_count == ec_storm_threshold) |
Lv Zheng | 56f77ee | 2017-08-11 14:36:28 +0800 | [diff] [blame] | 817 | acpi_ec_unmask_gpe(ec); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 818 | ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 819 | ec->curr = NULL; |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 820 | /* Disable GPE for command processing (IBF=0/OBF=1) */ |
| 821 | acpi_ec_complete_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 822 | ec_dbg_ref(ec, "Decrease command"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 823 | unlock: |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 824 | spin_unlock_irqrestore(&ec->lock, tmp); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 825 | return ret; |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 826 | } |
| 827 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 828 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 829 | { |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 830 | int status; |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 831 | u32 glk; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 832 | |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 833 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 834 | return -EINVAL; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 835 | if (t->rdata) |
| 836 | memset(t->rdata, 0, t->rlen); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 837 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 838 | mutex_lock(&ec->mutex); |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 839 | if (ec->global_lock) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
Alexey Starikovskiy | c24e912 | 2007-02-15 23:16:18 +0300 | [diff] [blame] | 841 | if (ACPI_FAILURE(status)) { |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 842 | status = -ENODEV; |
| 843 | goto unlock; |
Alexey Starikovskiy | c24e912 | 2007-02-15 23:16:18 +0300 | [diff] [blame] | 844 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | } |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 846 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 847 | status = acpi_ec_transaction_unlocked(ec, t); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 848 | |
Denis M. Sadykov | 703959d | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 849 | if (ec->global_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | acpi_release_global_lock(glk); |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 851 | unlock: |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 852 | mutex_unlock(&ec->mutex); |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 853 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | } |
| 855 | |
Roel Kluin | 8a383ef | 2008-12-09 20:45:30 +0100 | [diff] [blame] | 856 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 857 | { |
| 858 | u8 d; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 859 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
| 860 | .wdata = NULL, .rdata = &d, |
| 861 | .wlen = 0, .rlen = 1}; |
| 862 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 863 | return acpi_ec_transaction(ec, &t); |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 864 | } |
| 865 | |
Roel Kluin | 8a383ef | 2008-12-09 20:45:30 +0100 | [diff] [blame] | 866 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 867 | { |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 868 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
| 869 | .wdata = NULL, .rdata = NULL, |
| 870 | .wlen = 0, .rlen = 0}; |
| 871 | |
Alexey Starikovskiy | 7c6db4e | 2008-09-25 21:00:31 +0400 | [diff] [blame] | 872 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 873 | acpi_ec_transaction(ec, &t) : 0; |
Alexey Starikovskiy | c45aac4 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 874 | } |
| 875 | |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 876 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 877 | { |
| 878 | int result; |
| 879 | u8 d; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 880 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
| 881 | .wdata = &address, .rdata = &d, |
| 882 | .wlen = 1, .rlen = 1}; |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 883 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 884 | result = acpi_ec_transaction(ec, &t); |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 885 | *data = d; |
| 886 | return result; |
| 887 | } |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 888 | |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 889 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
| 890 | { |
Alexey Starikovskiy | 6ccedb1 | 2006-12-07 18:42:17 +0300 | [diff] [blame] | 891 | u8 wdata[2] = { address, data }; |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 892 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
| 893 | .wdata = wdata, .rdata = NULL, |
| 894 | .wlen = 2, .rlen = 0}; |
| 895 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 896 | return acpi_ec_transaction(ec, &t); |
Denis M. Sadykov | 3576cf6 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 897 | } |
| 898 | |
Feng Tang | b76b51b | 2012-10-23 01:29:38 +0200 | [diff] [blame] | 899 | int ec_read(u8 addr, u8 *val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | int err; |
Denis M. Sadykov | 6ffb221 | 2006-09-26 19:50:33 +0400 | [diff] [blame] | 902 | u8 temp_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
| 904 | if (!first_ec) |
| 905 | return -ENODEV; |
| 906 | |
Alexey Starikovskiy | d033879 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 907 | err = acpi_ec_read(first_ec, addr, &temp_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
| 909 | if (!err) { |
| 910 | *val = temp_data; |
| 911 | return 0; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 912 | } |
| 913 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } |
| 915 | EXPORT_SYMBOL(ec_read); |
| 916 | |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 917 | int ec_write(u8 addr, u8 val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | int err; |
| 920 | |
| 921 | if (!first_ec) |
| 922 | return -ENODEV; |
| 923 | |
Alexey Starikovskiy | d033879 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 924 | err = acpi_ec_write(first_ec, addr, val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | |
| 926 | return err; |
| 927 | } |
| 928 | EXPORT_SYMBOL(ec_write); |
| 929 | |
Randy Dunlap | 616362d | 2006-10-27 01:47:34 -0400 | [diff] [blame] | 930 | int ec_transaction(u8 command, |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 931 | const u8 *wdata, unsigned wdata_len, |
| 932 | u8 *rdata, unsigned rdata_len) |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 933 | { |
Alexey Starikovskiy | 8463200 | 2008-09-26 00:54:28 +0400 | [diff] [blame] | 934 | struct transaction t = {.command = command, |
| 935 | .wdata = wdata, .rdata = rdata, |
| 936 | .wlen = wdata_len, .rlen = rdata_len}; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 937 | |
Lennart Poettering | d7a76e4 | 2006-09-05 12:12:24 -0400 | [diff] [blame] | 938 | if (!first_ec) |
| 939 | return -ENODEV; |
| 940 | |
Alexey Starikovskiy | 2a84cb9 | 2009-08-30 03:06:14 +0400 | [diff] [blame] | 941 | return acpi_ec_transaction(first_ec, &t); |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 942 | } |
Lennart Poettering | ab9e43c | 2006-10-03 22:49:00 -0400 | [diff] [blame] | 943 | EXPORT_SYMBOL(ec_transaction); |
| 944 | |
Seth Forshee | 3e2abc5 | 2012-01-18 13:44:08 -0600 | [diff] [blame] | 945 | /* Get the handle to the EC device */ |
| 946 | acpi_handle ec_get_handle(void) |
| 947 | { |
| 948 | if (!first_ec) |
| 949 | return NULL; |
| 950 | return first_ec->handle; |
| 951 | } |
Seth Forshee | 3e2abc5 | 2012-01-18 13:44:08 -0600 | [diff] [blame] | 952 | EXPORT_SYMBOL(ec_get_handle); |
| 953 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 954 | static void acpi_ec_start(struct acpi_ec *ec, bool resuming) |
| 955 | { |
| 956 | unsigned long flags; |
| 957 | |
| 958 | spin_lock_irqsave(&ec->lock, flags); |
| 959 | if (!test_and_set_bit(EC_FLAGS_STARTED, &ec->flags)) { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 960 | ec_dbg_drv("Starting EC"); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 961 | /* Enable GPE for event processing (SCI_EVT=1) */ |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 962 | if (!resuming) { |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 963 | acpi_ec_submit_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 964 | ec_dbg_ref(ec, "Increase driver"); |
Lv Zheng | c2b46d6 | 2016-08-03 16:01:36 +0800 | [diff] [blame] | 965 | } |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 966 | ec_log_drv("EC started"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 967 | } |
| 968 | spin_unlock_irqrestore(&ec->lock, flags); |
| 969 | } |
| 970 | |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 971 | static bool acpi_ec_stopped(struct acpi_ec *ec) |
| 972 | { |
| 973 | unsigned long flags; |
| 974 | bool flushed; |
| 975 | |
| 976 | spin_lock_irqsave(&ec->lock, flags); |
| 977 | flushed = acpi_ec_flushed(ec); |
| 978 | spin_unlock_irqrestore(&ec->lock, flags); |
| 979 | return flushed; |
| 980 | } |
| 981 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 982 | static void acpi_ec_stop(struct acpi_ec *ec, bool suspending) |
| 983 | { |
| 984 | unsigned long flags; |
| 985 | |
| 986 | spin_lock_irqsave(&ec->lock, flags); |
| 987 | if (acpi_ec_started(ec)) { |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 988 | ec_dbg_drv("Stopping EC"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 989 | set_bit(EC_FLAGS_STOPPED, &ec->flags); |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 990 | spin_unlock_irqrestore(&ec->lock, flags); |
| 991 | wait_event(ec->wait, acpi_ec_stopped(ec)); |
| 992 | spin_lock_irqsave(&ec->lock, flags); |
| 993 | /* Disable GPE for event processing (SCI_EVT=1) */ |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 994 | if (!suspending) { |
Lv Zheng | 9887d22 | 2015-02-06 08:57:59 +0800 | [diff] [blame] | 995 | acpi_ec_complete_request(ec); |
Lv Zheng | 770970f | 2015-02-27 14:48:24 +0800 | [diff] [blame] | 996 | ec_dbg_ref(ec, "Decrease driver"); |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 997 | } else if (!ec_freeze_events) |
Lv Zheng | 750f628b | 2016-08-03 16:01:24 +0800 | [diff] [blame] | 998 | __acpi_ec_disable_event(ec); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 999 | clear_bit(EC_FLAGS_STARTED, &ec->flags); |
| 1000 | clear_bit(EC_FLAGS_STOPPED, &ec->flags); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 1001 | ec_log_drv("EC stopped"); |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1002 | } |
| 1003 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1004 | } |
| 1005 | |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1006 | static void acpi_ec_enter_noirq(struct acpi_ec *ec) |
| 1007 | { |
| 1008 | unsigned long flags; |
| 1009 | |
| 1010 | spin_lock_irqsave(&ec->lock, flags); |
| 1011 | ec->busy_polling = true; |
| 1012 | ec->polling_guard = 0; |
| 1013 | ec_log_drv("interrupt blocked"); |
| 1014 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1015 | } |
| 1016 | |
| 1017 | static void acpi_ec_leave_noirq(struct acpi_ec *ec) |
| 1018 | { |
| 1019 | unsigned long flags; |
| 1020 | |
| 1021 | spin_lock_irqsave(&ec->lock, flags); |
| 1022 | ec->busy_polling = ec_busy_polling; |
| 1023 | ec->polling_guard = ec_polling_guard; |
| 1024 | ec_log_drv("interrupt unblocked"); |
| 1025 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1026 | } |
| 1027 | |
Rafael J. Wysocki | fe95568 | 2010-04-09 01:40:38 +0200 | [diff] [blame] | 1028 | void acpi_ec_block_transactions(void) |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1029 | { |
| 1030 | struct acpi_ec *ec = first_ec; |
| 1031 | |
| 1032 | if (!ec) |
| 1033 | return; |
| 1034 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1035 | mutex_lock(&ec->mutex); |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1036 | /* Prevent transactions from being carried out */ |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1037 | acpi_ec_stop(ec, true); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1038 | mutex_unlock(&ec->mutex); |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1039 | } |
| 1040 | |
Rafael J. Wysocki | fe95568 | 2010-04-09 01:40:38 +0200 | [diff] [blame] | 1041 | void acpi_ec_unblock_transactions(void) |
Rafael J. Wysocki | f6bb13a | 2010-03-04 01:52:58 +0100 | [diff] [blame] | 1042 | { |
Rafael J. Wysocki | d5a6451 | 2010-04-09 01:39:40 +0200 | [diff] [blame] | 1043 | /* |
| 1044 | * Allow transactions to happen again (this function is called from |
| 1045 | * atomic context during wakeup, so we don't need to acquire the mutex). |
| 1046 | */ |
| 1047 | if (first_ec) |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1048 | acpi_ec_start(first_ec, true); |
Rafael J. Wysocki | d5a6451 | 2010-04-09 01:39:40 +0200 | [diff] [blame] | 1049 | } |
| 1050 | |
Rafael J. Wysocki | f941d3e | 2018-12-17 12:21:55 +0100 | [diff] [blame] | 1051 | void acpi_ec_mark_gpe_for_wake(void) |
| 1052 | { |
| 1053 | if (first_ec && !ec_no_wakeup) |
| 1054 | acpi_mark_gpe_for_wake(NULL, first_ec->gpe); |
| 1055 | } |
| 1056 | |
| 1057 | void acpi_ec_set_gpe_wake_mask(u8 action) |
| 1058 | { |
| 1059 | if (first_ec && !ec_no_wakeup) |
| 1060 | acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action); |
| 1061 | } |
| 1062 | |
Rafael J. Wysocki | 68e2201 | 2018-05-16 14:13:21 +0200 | [diff] [blame] | 1063 | void acpi_ec_dispatch_gpe(void) |
| 1064 | { |
| 1065 | if (first_ec) |
| 1066 | acpi_dispatch_gpe(NULL, first_ec->gpe); |
| 1067 | } |
| 1068 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | /* -------------------------------------------------------------------------- |
| 1070 | Event Management |
| 1071 | -------------------------------------------------------------------------- */ |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1072 | static struct acpi_ec_query_handler * |
| 1073 | acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) |
| 1074 | { |
| 1075 | if (handler) |
| 1076 | kref_get(&handler->kref); |
| 1077 | return handler; |
| 1078 | } |
| 1079 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1080 | static struct acpi_ec_query_handler * |
| 1081 | acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) |
| 1082 | { |
| 1083 | struct acpi_ec_query_handler *handler; |
| 1084 | bool found = false; |
| 1085 | |
| 1086 | mutex_lock(&ec->mutex); |
| 1087 | list_for_each_entry(handler, &ec->list, node) { |
| 1088 | if (value == handler->query_bit) { |
| 1089 | found = true; |
| 1090 | break; |
| 1091 | } |
| 1092 | } |
| 1093 | mutex_unlock(&ec->mutex); |
| 1094 | return found ? acpi_ec_get_query_handler(handler) : NULL; |
| 1095 | } |
| 1096 | |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1097 | static void acpi_ec_query_handler_release(struct kref *kref) |
| 1098 | { |
| 1099 | struct acpi_ec_query_handler *handler = |
| 1100 | container_of(kref, struct acpi_ec_query_handler, kref); |
| 1101 | |
| 1102 | kfree(handler); |
| 1103 | } |
| 1104 | |
| 1105 | static void acpi_ec_put_query_handler(struct acpi_ec_query_handler *handler) |
| 1106 | { |
| 1107 | kref_put(&handler->kref, acpi_ec_query_handler_release); |
| 1108 | } |
| 1109 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1110 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
| 1111 | acpi_handle handle, acpi_ec_query_func func, |
| 1112 | void *data) |
| 1113 | { |
| 1114 | struct acpi_ec_query_handler *handler = |
| 1115 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1116 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1117 | if (!handler) |
| 1118 | return -ENOMEM; |
| 1119 | |
| 1120 | handler->query_bit = query_bit; |
| 1121 | handler->handle = handle; |
| 1122 | handler->func = func; |
| 1123 | handler->data = data; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1124 | mutex_lock(&ec->mutex); |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1125 | kref_init(&handler->kref); |
Alexey Starikovskiy | 30c0857 | 2007-09-26 19:43:22 +0400 | [diff] [blame] | 1126 | list_add(&handler->node, &ec->list); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1127 | mutex_unlock(&ec->mutex); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1128 | return 0; |
| 1129 | } |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1130 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); |
| 1131 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1132 | static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, |
| 1133 | bool remove_all, u8 query_bit) |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1134 | { |
Adrian Bunk | 1544fdb | 2007-10-24 18:26:00 +0200 | [diff] [blame] | 1135 | struct acpi_ec_query_handler *handler, *tmp; |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1136 | LIST_HEAD(free_list); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1137 | |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1138 | mutex_lock(&ec->mutex); |
Adrian Bunk | 1544fdb | 2007-10-24 18:26:00 +0200 | [diff] [blame] | 1139 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1140 | if (remove_all || query_bit == handler->query_bit) { |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1141 | list_del_init(&handler->node); |
| 1142 | list_add(&handler->node, &free_list); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1143 | } |
| 1144 | } |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1145 | mutex_unlock(&ec->mutex); |
Chris Bainbridge | 6b5eab5 | 2015-04-22 00:25:36 +0100 | [diff] [blame] | 1146 | list_for_each_entry_safe(handler, tmp, &free_list, node) |
Lv Zheng | 01305d4 | 2015-01-14 19:28:28 +0800 | [diff] [blame] | 1147 | acpi_ec_put_query_handler(handler); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1148 | } |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1149 | |
| 1150 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) |
| 1151 | { |
| 1152 | acpi_ec_remove_query_handlers(ec, false, query_bit); |
| 1153 | } |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1154 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1156 | static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | { |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1158 | struct acpi_ec_query *q; |
| 1159 | struct transaction *t; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1160 | |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1161 | q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); |
| 1162 | if (!q) |
| 1163 | return NULL; |
| 1164 | INIT_WORK(&q->work, acpi_ec_event_processor); |
| 1165 | t = &q->transaction; |
| 1166 | t->command = ACPI_EC_COMMAND_QUERY; |
| 1167 | t->rdata = pval; |
| 1168 | t->rlen = 1; |
| 1169 | return q; |
| 1170 | } |
| 1171 | |
| 1172 | static void acpi_ec_delete_query(struct acpi_ec_query *q) |
| 1173 | { |
| 1174 | if (q) { |
| 1175 | if (q->handler) |
| 1176 | acpi_ec_put_query_handler(q->handler); |
| 1177 | kfree(q); |
| 1178 | } |
| 1179 | } |
| 1180 | |
| 1181 | static void acpi_ec_event_processor(struct work_struct *work) |
| 1182 | { |
| 1183 | struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); |
| 1184 | struct acpi_ec_query_handler *handler = q->handler; |
| 1185 | |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 1186 | ec_dbg_evt("Query(0x%02x) started", handler->query_bit); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1187 | if (handler->func) |
| 1188 | handler->func(handler->data); |
| 1189 | else if (handler->handle) |
| 1190 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); |
Lv Zheng | 3535a3c | 2015-02-27 14:48:15 +0800 | [diff] [blame] | 1191 | ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1192 | acpi_ec_delete_query(q); |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1193 | } |
| 1194 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1195 | static int acpi_ec_query(struct acpi_ec *ec, u8 *data) |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1196 | { |
| 1197 | u8 value = 0; |
Lv Zheng | c2cf576 | 2015-01-14 19:28:33 +0800 | [diff] [blame] | 1198 | int result; |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1199 | struct acpi_ec_query *q; |
| 1200 | |
| 1201 | q = acpi_ec_create_query(&value); |
| 1202 | if (!q) |
| 1203 | return -ENOMEM; |
Kieran Clancy | 3eba563 | 2014-04-30 00:21:20 +0930 | [diff] [blame] | 1204 | |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1205 | /* |
| 1206 | * Query the EC to find out which _Qxx method we need to evaluate. |
| 1207 | * Note that successful completion of the query causes the ACPI_EC_SCI |
| 1208 | * bit to be cleared (and thus clearing the interrupt source). |
| 1209 | */ |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1210 | result = acpi_ec_transaction(ec, &q->transaction); |
Lv Zheng | 550b3aac | 2015-01-14 19:28:53 +0800 | [diff] [blame] | 1211 | if (!value) |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1212 | result = -ENODATA; |
| 1213 | if (result) |
| 1214 | goto err_exit; |
Kieran Clancy | 3eba563 | 2014-04-30 00:21:20 +0930 | [diff] [blame] | 1215 | |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1216 | q->handler = acpi_ec_get_query_handler_by_value(ec, value); |
| 1217 | if (!q->handler) { |
| 1218 | result = -ENODATA; |
| 1219 | goto err_exit; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1220 | } |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1221 | |
| 1222 | /* |
| 1223 | * It is reported that _Qxx are evaluated in a parallel way on |
| 1224 | * Windows: |
| 1225 | * https://bugzilla.kernel.org/show_bug.cgi?id=94411 |
| 1226 | * |
| 1227 | * Put this log entry before schedule_work() in order to make |
| 1228 | * it appearing before any other log entries occurred during the |
| 1229 | * work queue execution. |
| 1230 | */ |
| 1231 | ec_dbg_evt("Query(0x%02x) scheduled", value); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 1232 | if (!queue_work(ec_query_wq, &q->work)) { |
Lv Zheng | 0700c04 | 2015-09-24 14:54:48 +0800 | [diff] [blame] | 1233 | ec_dbg_evt("Query(0x%02x) overlapped", value); |
| 1234 | result = -EBUSY; |
| 1235 | } |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1236 | |
| 1237 | err_exit: |
Markus Elfring | 4981c2b | 2015-11-15 22:42:27 +0100 | [diff] [blame] | 1238 | if (result) |
Lv Zheng | 02b771b | 2015-08-12 11:12:02 +0800 | [diff] [blame] | 1239 | acpi_ec_delete_query(q); |
| 1240 | if (data) |
| 1241 | *data = value; |
Lv Zheng | c2cf576 | 2015-01-14 19:28:33 +0800 | [diff] [blame] | 1242 | return result; |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1243 | } |
| 1244 | |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1245 | static void acpi_ec_check_event(struct acpi_ec *ec) |
| 1246 | { |
| 1247 | unsigned long flags; |
| 1248 | |
| 1249 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { |
| 1250 | if (ec_guard(ec)) { |
| 1251 | spin_lock_irqsave(&ec->lock, flags); |
| 1252 | /* |
| 1253 | * Take care of the SCI_EVT unless no one else is |
| 1254 | * taking care of it. |
| 1255 | */ |
| 1256 | if (!ec->curr) |
| 1257 | advance_transaction(ec); |
| 1258 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1259 | } |
| 1260 | } |
| 1261 | } |
| 1262 | |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1263 | static void acpi_ec_event_handler(struct work_struct *work) |
Alexey Starikovskiy | a62e8f1 | 2009-12-24 11:34:16 +0300 | [diff] [blame] | 1264 | { |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1265 | unsigned long flags; |
Lv Zheng | 74443bb | 2015-01-14 19:28:47 +0800 | [diff] [blame] | 1266 | struct acpi_ec *ec = container_of(work, struct acpi_ec, work); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1267 | |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1268 | ec_dbg_evt("Event started"); |
| 1269 | |
| 1270 | spin_lock_irqsave(&ec->lock, flags); |
| 1271 | while (ec->nr_pending_queries) { |
| 1272 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1273 | (void)acpi_ec_query(ec, NULL); |
| 1274 | spin_lock_irqsave(&ec->lock, flags); |
| 1275 | ec->nr_pending_queries--; |
Lv Zheng | 66db383 | 2015-06-11 13:21:51 +0800 | [diff] [blame] | 1276 | /* |
| 1277 | * Before exit, make sure that this work item can be |
| 1278 | * scheduled again. There might be QR_EC failures, leaving |
| 1279 | * EC_FLAGS_QUERY_PENDING uncleared and preventing this work |
| 1280 | * item from being scheduled again. |
| 1281 | */ |
| 1282 | if (!ec->nr_pending_queries) { |
| 1283 | if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || |
| 1284 | ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) |
| 1285 | acpi_ec_complete_query(ec); |
| 1286 | } |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1287 | } |
| 1288 | spin_unlock_irqrestore(&ec->lock, flags); |
| 1289 | |
| 1290 | ec_dbg_evt("Event stopped"); |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1291 | |
| 1292 | acpi_ec_check_event(ec); |
Luming Yu | 45bea15 | 2005-07-23 04:08:00 -0400 | [diff] [blame] | 1293 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | |
Lin Ming | 8b6cd8a | 2010-12-13 13:38:46 +0800 | [diff] [blame] | 1295 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
| 1296 | u32 gpe_number, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | { |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 1298 | unsigned long flags; |
Alexey Starikovskiy | 3d02b90 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1299 | struct acpi_ec *ec = data; |
Lennart Poettering | 00eb43a | 2007-05-04 14:16:19 +0200 | [diff] [blame] | 1300 | |
Lv Zheng | f92fca0 | 2014-06-15 08:41:35 +0800 | [diff] [blame] | 1301 | spin_lock_irqsave(&ec->lock, flags); |
Lv Zheng | 0c78808 | 2015-01-14 19:28:22 +0800 | [diff] [blame] | 1302 | advance_transaction(ec); |
Lv Zheng | c0d6534 | 2014-06-15 08:42:07 +0800 | [diff] [blame] | 1303 | spin_unlock_irqrestore(&ec->lock, flags); |
Lv Zheng | ca37bfd | 2015-02-05 16:27:22 +0800 | [diff] [blame] | 1304 | return ACPI_INTERRUPT_HANDLED; |
Alexey Starikovskiy | 845625c | 2008-03-21 17:07:03 +0300 | [diff] [blame] | 1305 | } |
| 1306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | /* -------------------------------------------------------------------------- |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1308 | * Address Space Management |
| 1309 | * -------------------------------------------------------------------------- */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | |
| 1311 | static acpi_status |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1312 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1313 | u32 bits, u64 *value64, |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 1314 | void *handler_context, void *region_context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | { |
Alexey Starikovskiy | 3d02b90 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1316 | struct acpi_ec *ec = handler_context; |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1317 | int result = 0, i, bytes = bits / 8; |
| 1318 | u8 *value = (u8 *)value64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | if ((address > 0xFF) || !value || !handler_context) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1321 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1323 | if (function != ACPI_READ && function != ACPI_WRITE) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1324 | return AE_BAD_PARAMETER; |
Alexey Starikovskiy | 5b7734b | 2007-05-29 16:42:52 +0400 | [diff] [blame] | 1325 | |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1326 | if (ec->busy_polling || bits > 8) |
Alexey Starikovskiy | 6a63b06f | 2009-08-28 23:29:44 +0400 | [diff] [blame] | 1327 | acpi_ec_burst_enable(ec); |
Alexey Starikovskiy | b3b233c | 2008-01-11 02:42:57 +0300 | [diff] [blame] | 1328 | |
Alexey Starikovskiy | dadf28a | 2010-03-17 13:14:13 -0400 | [diff] [blame] | 1329 | for (i = 0; i < bytes; ++i, ++address, ++value) |
| 1330 | result = (function == ACPI_READ) ? |
| 1331 | acpi_ec_read(ec, address, value) : |
| 1332 | acpi_ec_write(ec, address, *value); |
Alexey Starikovskiy | 3e71a87 | 2008-01-11 02:42:51 +0300 | [diff] [blame] | 1333 | |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1334 | if (ec->busy_polling || bits > 8) |
Alexey Starikovskiy | 6a63b06f | 2009-08-28 23:29:44 +0400 | [diff] [blame] | 1335 | acpi_ec_burst_disable(ec); |
Alexey Starikovskiy | b3b233c | 2008-01-11 02:42:57 +0300 | [diff] [blame] | 1336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | switch (result) { |
| 1338 | case -EINVAL: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1339 | return AE_BAD_PARAMETER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | case -ENODEV: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1341 | return AE_NOT_FOUND; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | case -ETIME: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1343 | return AE_TIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | default: |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1345 | return AE_OK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | } |
| 1348 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | /* -------------------------------------------------------------------------- |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1350 | * Driver Interface |
| 1351 | * -------------------------------------------------------------------------- */ |
| 1352 | |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1353 | static acpi_status |
| 1354 | ec_parse_io_ports(struct acpi_resource *resource, void *context); |
| 1355 | |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1356 | static void acpi_ec_free(struct acpi_ec *ec) |
| 1357 | { |
| 1358 | if (first_ec == ec) |
| 1359 | first_ec = NULL; |
| 1360 | if (boot_ec == ec) |
| 1361 | boot_ec = NULL; |
| 1362 | kfree(ec); |
| 1363 | } |
| 1364 | |
| 1365 | static struct acpi_ec *acpi_ec_alloc(void) |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1366 | { |
| 1367 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1368 | |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1369 | if (!ec) |
| 1370 | return NULL; |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1371 | mutex_init(&ec->mutex); |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1372 | init_waitqueue_head(&ec->wait); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1373 | INIT_LIST_HEAD(&ec->list); |
Feng Tang | f351d02 | 2012-10-23 01:29:27 +0200 | [diff] [blame] | 1374 | spin_lock_init(&ec->lock); |
Lv Zheng | 9d8993b | 2015-06-11 13:21:32 +0800 | [diff] [blame] | 1375 | INIT_WORK(&ec->work, acpi_ec_event_handler); |
Lv Zheng | d8d031a | 2015-05-15 14:16:42 +0800 | [diff] [blame] | 1376 | ec->timestamp = jiffies; |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1377 | ec->busy_polling = true; |
| 1378 | ec->polling_guard = 0; |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1379 | return ec; |
| 1380 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1382 | static acpi_status |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1383 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, |
| 1384 | void *context, void **return_value) |
| 1385 | { |
Lin Ming | 0175d56 | 2008-12-16 16:46:12 +0800 | [diff] [blame] | 1386 | char node_name[5]; |
| 1387 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1388 | struct acpi_ec *ec = context; |
| 1389 | int value = 0; |
Lin Ming | 0175d56 | 2008-12-16 16:46:12 +0800 | [diff] [blame] | 1390 | acpi_status status; |
| 1391 | |
| 1392 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); |
| 1393 | |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1394 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1395 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
Alexey Starikovskiy | c019b19 | 2007-08-14 01:03:42 -0400 | [diff] [blame] | 1396 | return AE_OK; |
| 1397 | } |
| 1398 | |
| 1399 | static acpi_status |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1400 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1401 | { |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1402 | acpi_status status; |
Alexey Starikovskiy | d21cf3c | 2008-11-03 14:26:40 -0500 | [diff] [blame] | 1403 | unsigned long long tmp = 0; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1404 | struct acpi_ec *ec = context; |
Alexey Starikovskiy | a5032bf | 2009-04-01 01:33:15 -0400 | [diff] [blame] | 1405 | |
| 1406 | /* clear addr values, ec_parse_io_ports depend on it */ |
| 1407 | ec->command_addr = ec->data_addr = 0; |
| 1408 | |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1409 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| 1410 | ec_parse_io_ports, ec); |
| 1411 | if (ACPI_FAILURE(status)) |
| 1412 | return status; |
Lv Zheng | ae56c9f | 2017-06-15 09:41:35 +0800 | [diff] [blame] | 1413 | if (ec->data_addr == 0 || ec->command_addr == 0) |
| 1414 | return AE_OK; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1415 | |
Chris Chiu | 440f53d | 2017-06-15 09:41:47 +0800 | [diff] [blame] | 1416 | if (boot_ec && boot_ec_is_ecdt && EC_FLAGS_IGNORE_DSDT_GPE) { |
| 1417 | /* |
| 1418 | * Always inherit the GPE number setting from the ECDT |
| 1419 | * EC. |
| 1420 | */ |
| 1421 | ec->gpe = boot_ec->gpe; |
| 1422 | } else { |
| 1423 | /* Get GPE bit assignment (EC events). */ |
| 1424 | /* TODO: Add support for _GPE returning a package */ |
| 1425 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
| 1426 | if (ACPI_FAILURE(status)) |
| 1427 | return status; |
| 1428 | ec->gpe = tmp; |
| 1429 | } |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1430 | /* Use the global lock for all EC transactions? */ |
Alexey Starikovskiy | d21cf3c | 2008-11-03 14:26:40 -0500 | [diff] [blame] | 1431 | tmp = 0; |
Matthew Wilcox | 27663c5 | 2008-10-10 02:22:59 -0400 | [diff] [blame] | 1432 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
| 1433 | ec->global_lock = tmp; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1434 | ec->handle = handle; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1435 | return AE_CTRL_TERMINATE; |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1436 | } |
| 1437 | |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1438 | /* |
| 1439 | * Note: This function returns an error code only when the address space |
| 1440 | * handler is not installed, which means "not able to handle |
| 1441 | * transactions". |
| 1442 | */ |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1443 | static int ec_install_handlers(struct acpi_ec *ec, bool handle_events) |
Alexey Starikovskiy | e828432 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1444 | { |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1445 | acpi_status status; |
Lv Zheng | 7a73e60 | 2014-10-14 14:24:01 +0800 | [diff] [blame] | 1446 | |
Lv Zheng | ad479e7 | 2015-02-06 08:57:52 +0800 | [diff] [blame] | 1447 | acpi_ec_start(ec, false); |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1448 | |
| 1449 | if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1450 | acpi_ec_enter_noirq(ec); |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1451 | status = acpi_install_address_space_handler(ec->handle, |
| 1452 | ACPI_ADR_SPACE_EC, |
| 1453 | &acpi_ec_space_handler, |
| 1454 | NULL, ec); |
| 1455 | if (ACPI_FAILURE(status)) { |
| 1456 | if (status == AE_NOT_FOUND) { |
| 1457 | /* |
| 1458 | * Maybe OS fails in evaluating the _REG |
| 1459 | * object. The AE_NOT_FOUND error will be |
| 1460 | * ignored and OS * continue to initialize |
| 1461 | * EC. |
| 1462 | */ |
| 1463 | pr_err("Fail in evaluating the _REG object" |
| 1464 | " of EC device. Broken bios is suspected.\n"); |
| 1465 | } else { |
| 1466 | acpi_ec_stop(ec, false); |
| 1467 | return -ENODEV; |
| 1468 | } |
| 1469 | } |
| 1470 | set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); |
| 1471 | } |
| 1472 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1473 | if (!handle_events) |
| 1474 | return 0; |
| 1475 | |
| 1476 | if (!test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { |
| 1477 | /* Find and register all query methods */ |
| 1478 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, |
| 1479 | acpi_ec_register_query_methods, |
| 1480 | NULL, ec, NULL); |
| 1481 | set_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); |
| 1482 | } |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1483 | if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
| 1484 | status = acpi_install_gpe_raw_handler(NULL, ec->gpe, |
| 1485 | ACPI_GPE_EDGE_TRIGGERED, |
| 1486 | &acpi_ec_gpe_handler, ec); |
| 1487 | /* This is not fatal as we can poll EC events */ |
| 1488 | if (ACPI_SUCCESS(status)) { |
| 1489 | set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); |
Lv Zheng | c3a696b | 2017-01-20 16:42:48 +0800 | [diff] [blame] | 1490 | acpi_ec_leave_noirq(ec); |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1491 | if (test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 1492 | ec->reference_count >= 1) |
| 1493 | acpi_ec_enable_gpe(ec, true); |
Zhao Yakui | 20edd74 | 2008-10-17 02:02:44 -0400 | [diff] [blame] | 1494 | } |
Alexey Starikovskiy | e828432 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1495 | } |
Lv Zheng | 53c5eaa | 2017-09-26 16:54:03 +0800 | [diff] [blame] | 1496 | /* EC is fully operational, allow queries */ |
| 1497 | acpi_ec_enable_event(ec); |
Alexey Starikovskiy | e828432 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1498 | |
| 1499 | return 0; |
| 1500 | } |
| 1501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | static void ec_remove_handlers(struct acpi_ec *ec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | { |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1504 | if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { |
| 1505 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
| 1506 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) |
| 1507 | pr_err("failed to remove space handler\n"); |
| 1508 | clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); |
| 1509 | } |
| 1510 | |
Lv Zheng | fa5b4a5 | 2016-07-08 09:25:05 +0800 | [diff] [blame] | 1511 | /* |
| 1512 | * Stops handling the EC transactions after removing the operation |
| 1513 | * region handler. This is required because _REG(DISCONNECT) |
| 1514 | * invoked during the removal can result in new EC transactions. |
| 1515 | * |
| 1516 | * Flushes the EC requests and thus disables the GPE before |
| 1517 | * removing the GPE handler. This is required by the current ACPICA |
| 1518 | * GPE core. ACPICA GPE core will automatically disable a GPE when |
| 1519 | * it is indicated but there is no way to handle it. So the drivers |
| 1520 | * must disable the GPEs prior to removing the GPE handlers. |
| 1521 | */ |
| 1522 | acpi_ec_stop(ec, false); |
| 1523 | |
Lv Zheng | 0e1affe | 2016-03-24 10:42:47 +0800 | [diff] [blame] | 1524 | if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { |
| 1525 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
| 1526 | &acpi_ec_gpe_handler))) |
| 1527 | pr_err("failed to remove gpe handler\n"); |
| 1528 | clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); |
| 1529 | } |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1530 | if (test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { |
| 1531 | acpi_ec_remove_query_handlers(ec, true, 0); |
| 1532 | clear_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); |
| 1533 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1536 | static int acpi_ec_setup(struct acpi_ec *ec, bool handle_events) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | { |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1538 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1540 | ret = ec_install_handlers(ec, handle_events); |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1541 | if (ret) |
| 1542 | return ret; |
| 1543 | |
| 1544 | /* First EC capable of handling transactions */ |
| 1545 | if (!first_ec) { |
| 1546 | first_ec = ec; |
| 1547 | acpi_handle_info(first_ec->handle, "Used as first EC\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | } |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1549 | |
| 1550 | acpi_handle_info(ec->handle, |
Geert Uytterhoeven | 3522f86 | 2018-01-02 16:26:31 +0100 | [diff] [blame] | 1551 | "GPE=0x%x, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1552 | ec->gpe, ec->command_addr, ec->data_addr); |
| 1553 | return ret; |
| 1554 | } |
| 1555 | |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1556 | static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle) |
| 1557 | { |
| 1558 | struct acpi_table_ecdt *ecdt_ptr; |
| 1559 | acpi_status status; |
| 1560 | acpi_handle handle; |
| 1561 | |
| 1562 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
| 1563 | (struct acpi_table_header **)&ecdt_ptr); |
| 1564 | if (ACPI_FAILURE(status)) |
| 1565 | return false; |
| 1566 | |
| 1567 | status = acpi_get_handle(NULL, ecdt_ptr->id, &handle); |
| 1568 | if (ACPI_FAILURE(status)) |
| 1569 | return false; |
| 1570 | |
| 1571 | *phandle = handle; |
| 1572 | return true; |
| 1573 | } |
| 1574 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1575 | static int acpi_ec_add(struct acpi_device *device) |
| 1576 | { |
| 1577 | struct acpi_ec *ec = NULL; |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1578 | bool dep_update = true; |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1579 | acpi_status status; |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1580 | int ret; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1581 | |
| 1582 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
| 1583 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); |
| 1584 | |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1585 | if (!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) { |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1586 | boot_ec_is_ecdt = true; |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1587 | ec = boot_ec; |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1588 | dep_update = false; |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1589 | } else { |
| 1590 | ec = acpi_ec_alloc(); |
| 1591 | if (!ec) |
| 1592 | return -ENOMEM; |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1593 | |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1594 | status = ec_parse_device(device->handle, 0, ec, NULL); |
| 1595 | if (status != AE_CTRL_TERMINATE) { |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1596 | ret = -EINVAL; |
| 1597 | goto err_alloc; |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1598 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1600 | if (boot_ec && ec->command_addr == boot_ec->command_addr && |
| 1601 | ec->data_addr == boot_ec->data_addr) { |
| 1602 | boot_ec_is_ecdt = false; |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1603 | /* |
| 1604 | * Trust PNP0C09 namespace location rather than |
| 1605 | * ECDT ID. But trust ECDT GPE rather than _GPE |
| 1606 | * because of ASUS quirks, so do not change |
| 1607 | * boot_ec->gpe to ec->gpe. |
| 1608 | */ |
| 1609 | boot_ec->handle = ec->handle; |
| 1610 | acpi_handle_debug(ec->handle, "duplicated.\n"); |
| 1611 | acpi_ec_free(ec); |
| 1612 | ec = boot_ec; |
| 1613 | } |
Rafael J. Wysocki | d2c62ae | 2019-02-01 12:55:31 +0100 | [diff] [blame] | 1614 | } |
| 1615 | |
| 1616 | ret = acpi_ec_setup(ec, true); |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1617 | if (ret) |
| 1618 | goto err_query; |
| 1619 | |
Rafael J. Wysocki | d2c62ae | 2019-02-01 12:55:31 +0100 | [diff] [blame] | 1620 | if (ec == boot_ec) |
| 1621 | acpi_handle_info(boot_ec->handle, |
| 1622 | "Boot %s EC used to handle transactions and events\n", |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1623 | boot_ec_is_ecdt ? "ECDT" : "DSDT"); |
Rafael J. Wysocki | d2c62ae | 2019-02-01 12:55:31 +0100 | [diff] [blame] | 1624 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | device->driver_data = ec; |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1626 | |
Andi Kleen | d6795fe3 | 2012-02-06 08:17:08 -0800 | [diff] [blame] | 1627 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
| 1628 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); |
| 1629 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); |
| 1630 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1631 | |
Rafael J. Wysocki | 116f2b3 | 2019-02-01 12:56:03 +0100 | [diff] [blame] | 1632 | if (dep_update) { |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1633 | /* Reprobe devices depending on the EC */ |
| 1634 | acpi_walk_dep_device_list(ec->handle); |
| 1635 | } |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1636 | acpi_handle_debug(ec->handle, "enumerated.\n"); |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1637 | return 0; |
| 1638 | |
| 1639 | err_query: |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1640 | if (ec != boot_ec) |
| 1641 | acpi_ec_remove_query_handlers(ec, true, 0); |
Lv Zheng | 46922d2 | 2016-09-07 16:50:14 +0800 | [diff] [blame] | 1642 | err_alloc: |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1643 | if (ec != boot_ec) |
| 1644 | acpi_ec_free(ec); |
Alexey Starikovskiy | 837012e | 2007-05-29 16:43:02 +0400 | [diff] [blame] | 1645 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | } |
| 1647 | |
Rafael J. Wysocki | 51fac83 | 2013-01-24 00:24:48 +0100 | [diff] [blame] | 1648 | static int acpi_ec_remove(struct acpi_device *device) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | { |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1650 | struct acpi_ec *ec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | if (!device) |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1653 | return -EINVAL; |
Alexey Starikovskiy | f9319f9 | 2007-08-24 08:10:11 +0400 | [diff] [blame] | 1654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | ec = acpi_driver_data(device); |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1656 | release_region(ec->data_addr, 1); |
| 1657 | release_region(ec->command_addr, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | device->driver_data = NULL; |
Lv Zheng | 97cb159 | 2016-09-07 16:50:27 +0800 | [diff] [blame] | 1659 | if (ec != boot_ec) { |
| 1660 | ec_remove_handlers(ec); |
| 1661 | acpi_ec_free(ec); |
| 1662 | } |
Patrick Mochel | d550d98 | 2006-06-27 00:41:40 -0400 | [diff] [blame] | 1663 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | } |
| 1665 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | static acpi_status |
| 1667 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
| 1668 | { |
| 1669 | struct acpi_ec *ec = context; |
| 1670 | |
| 1671 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
| 1672 | return AE_OK; |
| 1673 | |
| 1674 | /* |
| 1675 | * The first address region returned is the data port, and |
| 1676 | * the second address region returned is the status/command |
| 1677 | * port. |
| 1678 | */ |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1679 | if (ec->data_addr == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | ec->data_addr = resource->data.io.minimum; |
Thomas Renninger | de4f104 | 2010-07-29 22:08:44 +0200 | [diff] [blame] | 1681 | else if (ec->command_addr == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | ec->command_addr = resource->data.io.minimum; |
| 1683 | else |
| 1684 | return AE_CTRL_TERMINATE; |
| 1685 | |
| 1686 | return AE_OK; |
| 1687 | } |
| 1688 | |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1689 | static const struct acpi_device_id ec_device_ids[] = { |
| 1690 | {"PNP0C09", 0}, |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1691 | {ACPI_ECDT_HID, 0}, |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1692 | {"", 0}, |
| 1693 | }; |
| 1694 | |
Lv Zheng | c712bb5 | 2017-06-15 09:41:41 +0800 | [diff] [blame] | 1695 | /* |
| 1696 | * This function is not Windows-compatible as Windows never enumerates the |
| 1697 | * namespace EC before the main ACPI device enumeration process. It is |
| 1698 | * retained for historical reason and will be deprecated in the future. |
| 1699 | */ |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1700 | void __init acpi_ec_dsdt_probe(void) |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1701 | { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1702 | struct acpi_ec *ec; |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1703 | acpi_status status; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1704 | int ret; |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1705 | |
Lv Zheng | c712bb5 | 2017-06-15 09:41:41 +0800 | [diff] [blame] | 1706 | /* |
| 1707 | * If a platform has ECDT, there is no need to proceed as the |
| 1708 | * following probe is not a part of the ACPI device enumeration, |
| 1709 | * executing _STA is not safe, and thus this probe may risk of |
| 1710 | * picking up an invalid EC device. |
| 1711 | */ |
| 1712 | if (boot_ec) |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1713 | return; |
Lv Zheng | c712bb5 | 2017-06-15 09:41:41 +0800 | [diff] [blame] | 1714 | |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1715 | ec = acpi_ec_alloc(); |
| 1716 | if (!ec) |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1717 | return; |
| 1718 | |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1719 | /* |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1720 | * At this point, the namespace is initialized, so start to find |
| 1721 | * the namespace objects. |
Lv Zheng | dcf15cb | 2016-06-03 10:26:12 +0800 | [diff] [blame] | 1722 | */ |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1723 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, ec, NULL); |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1724 | if (ACPI_FAILURE(status) || !ec->handle) { |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1725 | acpi_ec_free(ec); |
| 1726 | return; |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1727 | } |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1728 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1729 | /* |
| 1730 | * When the DSDT EC is available, always re-configure boot EC to |
| 1731 | * have _REG evaluated. _REG can only be evaluated after the |
| 1732 | * namespace initialization. |
| 1733 | * At this point, the GPE is not fully initialized, so do not to |
| 1734 | * handle the events. |
| 1735 | */ |
Rafael J. Wysocki | c746b6b | 2019-02-01 10:59:42 +0100 | [diff] [blame] | 1736 | ret = acpi_ec_setup(ec, false); |
| 1737 | if (ret) { |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1738 | acpi_ec_free(ec); |
Rafael J. Wysocki | c746b6b | 2019-02-01 10:59:42 +0100 | [diff] [blame] | 1739 | return; |
| 1740 | } |
| 1741 | |
| 1742 | boot_ec = ec; |
| 1743 | |
| 1744 | acpi_handle_info(ec->handle, |
| 1745 | "Boot DSDT EC used to handle transactions\n"); |
Alexey Starikovskiy | c04209a | 2008-01-01 14:12:55 -0500 | [diff] [blame] | 1746 | } |
| 1747 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1748 | /* |
| 1749 | * If the DSDT EC is not functioning, we still need to prepare a fully |
| 1750 | * functioning ECDT EC first in order to handle the events. |
| 1751 | * https://bugzilla.kernel.org/show_bug.cgi?id=115021 |
| 1752 | */ |
Lv Zheng | 98529b9 | 2017-08-16 15:29:49 +0800 | [diff] [blame] | 1753 | static int __init acpi_ec_ecdt_start(void) |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1754 | { |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1755 | acpi_handle handle; |
| 1756 | |
| 1757 | if (!boot_ec) |
| 1758 | return -ENODEV; |
Lv Zheng | 69b957c | 2017-08-17 10:21:12 +0800 | [diff] [blame] | 1759 | /* In case acpi_ec_ecdt_start() is called after acpi_ec_add() */ |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1760 | if (!boot_ec_is_ecdt) |
| 1761 | return -ENODEV; |
| 1762 | |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1763 | /* |
| 1764 | * At this point, the namespace and the GPE is initialized, so |
| 1765 | * start to find the namespace objects and handle the events. |
Lv Zheng | 69b957c | 2017-08-17 10:21:12 +0800 | [diff] [blame] | 1766 | * |
| 1767 | * Note: ec->handle can be valid if this function is called after |
| 1768 | * acpi_ec_add(), hence the fast path. |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1769 | */ |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 1770 | if (boot_ec->handle == ACPI_ROOT_OBJECT) { |
| 1771 | if (!acpi_ec_ecdt_get_handle(&handle)) |
| 1772 | return -ENODEV; |
| 1773 | boot_ec->handle = handle; |
| 1774 | } |
| 1775 | |
| 1776 | /* Register to ACPI bus with PM ops attached */ |
| 1777 | return acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC); |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1778 | } |
| 1779 | |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1780 | #if 0 |
Feng Tang | 67bfa9b | 2012-09-28 15:22:01 +0800 | [diff] [blame] | 1781 | /* |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1782 | * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not |
| 1783 | * set, for which case, we complete the QR_EC without issuing it to the |
| 1784 | * firmware. |
| 1785 | * https://bugzilla.kernel.org/show_bug.cgi?id=82611 |
| 1786 | * https://bugzilla.kernel.org/show_bug.cgi?id=97381 |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 1787 | */ |
| 1788 | static int ec_flag_query_handshake(const struct dmi_system_id *id) |
| 1789 | { |
| 1790 | pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); |
| 1791 | EC_FLAGS_QUERY_HANDSHAKE = 1; |
| 1792 | return 0; |
| 1793 | } |
Lv Zheng | 3cb02ae | 2015-06-11 13:21:45 +0800 | [diff] [blame] | 1794 | #endif |
Lv Zheng | 7914900 | 2014-10-29 11:33:49 +0800 | [diff] [blame] | 1795 | |
| 1796 | /* |
Zhang Rui | b6a3e14 | 2019-02-01 14:13:41 +0800 | [diff] [blame] | 1797 | * On some hardware it is necessary to clear events accumulated by the EC during |
| 1798 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too |
| 1799 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) |
| 1800 | * |
| 1801 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 |
| 1802 | * |
| 1803 | * Ideally, the EC should also be instructed NOT to accumulate events during |
| 1804 | * sleep (which Windows seems to do somehow), but the interface to control this |
| 1805 | * behaviour is not known at this time. |
| 1806 | * |
| 1807 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, |
| 1808 | * however it is very likely that other Samsung models are affected. |
| 1809 | * |
| 1810 | * On systems which don't accumulate _Q events during sleep, this extra check |
| 1811 | * should be harmless. |
| 1812 | */ |
| 1813 | static int ec_clear_on_resume(const struct dmi_system_id *id) |
| 1814 | { |
| 1815 | pr_debug("Detected system needing EC poll on resume.\n"); |
| 1816 | EC_FLAGS_CLEAR_ON_RESUME = 1; |
| 1817 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
| 1818 | return 0; |
| 1819 | } |
| 1820 | |
| 1821 | /* |
Lv Zheng | bc53956 | 2016-06-21 17:42:12 +0800 | [diff] [blame] | 1822 | * Some ECDTs contain wrong register addresses. |
| 1823 | * MSI MS-171F |
| 1824 | * https://bugzilla.kernel.org/show_bug.cgi?id=12461 |
| 1825 | */ |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1826 | static int ec_correct_ecdt(const struct dmi_system_id *id) |
| 1827 | { |
| 1828 | pr_debug("Detected system needing ECDT address correction.\n"); |
| 1829 | EC_FLAGS_CORRECT_ECDT = 1; |
| 1830 | return 0; |
| 1831 | } |
| 1832 | |
Chris Chiu | 440f53d | 2017-06-15 09:41:47 +0800 | [diff] [blame] | 1833 | /* |
| 1834 | * Some DSDTs contain wrong GPE setting. |
Carlo Caione | ef75040 | 2017-06-15 09:41:53 +0800 | [diff] [blame] | 1835 | * Asus FX502VD/VE, GL702VMK, X550VXK, X580VD |
Chris Chiu | 440f53d | 2017-06-15 09:41:47 +0800 | [diff] [blame] | 1836 | * https://bugzilla.kernel.org/show_bug.cgi?id=195651 |
| 1837 | */ |
| 1838 | static int ec_honor_ecdt_gpe(const struct dmi_system_id *id) |
| 1839 | { |
| 1840 | pr_debug("Detected system needing ignore DSDT GPE setting.\n"); |
| 1841 | EC_FLAGS_IGNORE_DSDT_GPE = 1; |
| 1842 | return 0; |
| 1843 | } |
| 1844 | |
Christoph Hellwig | 6faadbb | 2017-09-14 11:59:30 +0200 | [diff] [blame] | 1845 | static const struct dmi_system_id ec_dmi_table[] __initconst = { |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1846 | { |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1847 | ec_correct_ecdt, "MSI MS-171F", { |
Lv Zheng | 3174abc | 2015-05-15 14:37:11 +0800 | [diff] [blame] | 1848 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), |
| 1849 | DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, |
Chris Chiu | 440f53d | 2017-06-15 09:41:47 +0800 | [diff] [blame] | 1850 | { |
| 1851 | ec_honor_ecdt_gpe, "ASUS FX502VD", { |
| 1852 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| 1853 | DMI_MATCH(DMI_PRODUCT_NAME, "FX502VD"),}, NULL}, |
| 1854 | { |
| 1855 | ec_honor_ecdt_gpe, "ASUS FX502VE", { |
| 1856 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| 1857 | DMI_MATCH(DMI_PRODUCT_NAME, "FX502VE"),}, NULL}, |
| 1858 | { |
Carlo Caione | ef75040 | 2017-06-15 09:41:53 +0800 | [diff] [blame] | 1859 | ec_honor_ecdt_gpe, "ASUS GL702VMK", { |
| 1860 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| 1861 | DMI_MATCH(DMI_PRODUCT_NAME, "GL702VMK"),}, NULL}, |
| 1862 | { |
Chris Chiu | 440f53d | 2017-06-15 09:41:47 +0800 | [diff] [blame] | 1863 | ec_honor_ecdt_gpe, "ASUS X550VXK", { |
| 1864 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| 1865 | DMI_MATCH(DMI_PRODUCT_NAME, "X550VXK"),}, NULL}, |
| 1866 | { |
| 1867 | ec_honor_ecdt_gpe, "ASUS X580VD", { |
| 1868 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), |
| 1869 | DMI_MATCH(DMI_PRODUCT_NAME, "X580VD"),}, NULL}, |
Zhang Rui | b6a3e14 | 2019-02-01 14:13:41 +0800 | [diff] [blame] | 1870 | { |
| 1871 | ec_clear_on_resume, "Samsung hardware", { |
| 1872 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1873 | {}, |
| 1874 | }; |
| 1875 | |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1876 | void __init acpi_ec_ecdt_probe(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | { |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1878 | struct acpi_table_ecdt *ecdt_ptr; |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1879 | struct acpi_ec *ec; |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1880 | acpi_status status; |
| 1881 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1883 | /* Generate a boot ec context. */ |
Alexey Starikovskiy | 0adf3c7 | 2009-10-02 20:21:33 +0400 | [diff] [blame] | 1884 | dmi_check_system(ec_dmi_table); |
Alexey Starikovskiy | c0900c3 | 2007-03-07 22:28:00 +0300 | [diff] [blame] | 1885 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
| 1886 | (struct acpi_table_header **)&ecdt_ptr); |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1887 | if (ACPI_FAILURE(status)) |
| 1888 | return; |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1889 | |
| 1890 | if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { |
| 1891 | /* |
| 1892 | * Asus X50GL: |
| 1893 | * https://bugzilla.kernel.org/show_bug.cgi?id=11880 |
| 1894 | */ |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1895 | return; |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1896 | } |
| 1897 | |
Rafael J. Wysocki | fdb3c177 | 2019-01-21 13:07:50 +0100 | [diff] [blame] | 1898 | ec = acpi_ec_alloc(); |
| 1899 | if (!ec) |
| 1900 | return; |
| 1901 | |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1902 | if (EC_FLAGS_CORRECT_ECDT) { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1903 | ec->command_addr = ecdt_ptr->data.address; |
| 1904 | ec->data_addr = ecdt_ptr->control.address; |
Lv Zheng | 59f0aa9 | 2016-03-24 10:42:53 +0800 | [diff] [blame] | 1905 | } else { |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1906 | ec->command_addr = ecdt_ptr->control.address; |
| 1907 | ec->data_addr = ecdt_ptr->data.address; |
Alexey Starikovskiy | cd8c93a | 2007-08-03 17:52:48 -0400 | [diff] [blame] | 1908 | } |
Lv Zheng | fd6231e | 2016-06-21 17:42:05 +0800 | [diff] [blame] | 1909 | ec->gpe = ecdt_ptr->gpe; |
Rafael J. Wysocki | 1568426 | 2019-02-01 10:58:20 +0100 | [diff] [blame] | 1910 | ec->handle = ACPI_ROOT_OBJECT; |
Lv Zheng | 2a57084 | 2016-09-07 16:50:21 +0800 | [diff] [blame] | 1911 | |
| 1912 | /* |
| 1913 | * At this point, the namespace is not initialized, so do not find |
| 1914 | * the namespace objects, or handle the events. |
| 1915 | */ |
Rafael J. Wysocki | 1568426 | 2019-02-01 10:58:20 +0100 | [diff] [blame] | 1916 | ret = acpi_ec_setup(ec, false); |
| 1917 | if (ret) { |
Lv Zheng | 72c77b7 | 2016-09-07 16:50:08 +0800 | [diff] [blame] | 1918 | acpi_ec_free(ec); |
Rafael J. Wysocki | 1568426 | 2019-02-01 10:58:20 +0100 | [diff] [blame] | 1919 | return; |
| 1920 | } |
| 1921 | |
| 1922 | boot_ec = ec; |
| 1923 | boot_ec_is_ecdt = true; |
| 1924 | |
| 1925 | pr_info("Boot ECDT EC used to handle transactions\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | } |
| 1927 | |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1928 | #ifdef CONFIG_PM_SLEEP |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 1929 | static int acpi_ec_suspend(struct device *dev) |
| 1930 | { |
| 1931 | struct acpi_ec *ec = |
| 1932 | acpi_driver_data(to_acpi_device(dev)); |
| 1933 | |
Rafael J. Wysocki | 8110dd28 | 2017-06-23 15:24:32 +0200 | [diff] [blame] | 1934 | if (acpi_sleep_no_ec_events() && ec_freeze_events) |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 1935 | acpi_ec_disable_event(ec); |
| 1936 | return 0; |
| 1937 | } |
| 1938 | |
Rafael J. Wysocki | 7638063 | 2017-07-19 14:41:58 +0200 | [diff] [blame] | 1939 | static int acpi_ec_suspend_noirq(struct device *dev) |
| 1940 | { |
| 1941 | struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); |
| 1942 | |
| 1943 | /* |
| 1944 | * The SCI handler doesn't run at this point, so the GPE can be |
| 1945 | * masked at the low level without side effects. |
| 1946 | */ |
| 1947 | if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 1948 | ec->reference_count >= 1) |
| 1949 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); |
| 1950 | |
Rafael J. Wysocki | 3cd091a | 2018-02-09 22:55:28 +0100 | [diff] [blame] | 1951 | if (acpi_sleep_no_ec_events()) |
| 1952 | acpi_ec_enter_noirq(ec); |
| 1953 | |
Rafael J. Wysocki | 7638063 | 2017-07-19 14:41:58 +0200 | [diff] [blame] | 1954 | return 0; |
| 1955 | } |
| 1956 | |
| 1957 | static int acpi_ec_resume_noirq(struct device *dev) |
| 1958 | { |
| 1959 | struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); |
| 1960 | |
Rafael J. Wysocki | 3cd091a | 2018-02-09 22:55:28 +0100 | [diff] [blame] | 1961 | if (acpi_sleep_no_ec_events()) |
| 1962 | acpi_ec_leave_noirq(ec); |
| 1963 | |
Rafael J. Wysocki | 7638063 | 2017-07-19 14:41:58 +0200 | [diff] [blame] | 1964 | if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && |
| 1965 | ec->reference_count >= 1) |
| 1966 | acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); |
| 1967 | |
| 1968 | return 0; |
| 1969 | } |
| 1970 | |
Lv Zheng | c2b46d6 | 2016-08-03 16:01:36 +0800 | [diff] [blame] | 1971 | static int acpi_ec_resume(struct device *dev) |
| 1972 | { |
| 1973 | struct acpi_ec *ec = |
| 1974 | acpi_driver_data(to_acpi_device(dev)); |
| 1975 | |
| 1976 | acpi_ec_enable_event(ec); |
| 1977 | return 0; |
| 1978 | } |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1979 | #endif |
| 1980 | |
| 1981 | static const struct dev_pm_ops acpi_ec_pm = { |
Rafael J. Wysocki | 7638063 | 2017-07-19 14:41:58 +0200 | [diff] [blame] | 1982 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) |
Lv Zheng | 39a2a2a | 2016-08-03 16:01:43 +0800 | [diff] [blame] | 1983 | SET_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend, acpi_ec_resume) |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 1984 | }; |
| 1985 | |
Kees Cook | e4dca7b | 2017-10-17 19:04:42 -0700 | [diff] [blame] | 1986 | static int param_set_event_clearing(const char *val, |
| 1987 | const struct kernel_param *kp) |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 1988 | { |
| 1989 | int result = 0; |
| 1990 | |
| 1991 | if (!strncmp(val, "status", sizeof("status") - 1)) { |
| 1992 | ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; |
| 1993 | pr_info("Assuming SCI_EVT clearing on EC_SC accesses\n"); |
| 1994 | } else if (!strncmp(val, "query", sizeof("query") - 1)) { |
| 1995 | ec_event_clearing = ACPI_EC_EVT_TIMING_QUERY; |
| 1996 | pr_info("Assuming SCI_EVT clearing on QR_EC writes\n"); |
| 1997 | } else if (!strncmp(val, "event", sizeof("event") - 1)) { |
| 1998 | ec_event_clearing = ACPI_EC_EVT_TIMING_EVENT; |
| 1999 | pr_info("Assuming SCI_EVT clearing on event reads\n"); |
| 2000 | } else |
| 2001 | result = -EINVAL; |
| 2002 | return result; |
| 2003 | } |
| 2004 | |
Kees Cook | e4dca7b | 2017-10-17 19:04:42 -0700 | [diff] [blame] | 2005 | static int param_get_event_clearing(char *buffer, |
| 2006 | const struct kernel_param *kp) |
Lv Zheng | 1d68d26 | 2015-06-11 13:21:38 +0800 | [diff] [blame] | 2007 | { |
| 2008 | switch (ec_event_clearing) { |
| 2009 | case ACPI_EC_EVT_TIMING_STATUS: |
| 2010 | return sprintf(buffer, "status"); |
| 2011 | case ACPI_EC_EVT_TIMING_QUERY: |
| 2012 | return sprintf(buffer, "query"); |
| 2013 | case ACPI_EC_EVT_TIMING_EVENT: |
| 2014 | return sprintf(buffer, "event"); |
| 2015 | default: |
| 2016 | return sprintf(buffer, "invalid"); |
| 2017 | } |
| 2018 | return 0; |
| 2019 | } |
| 2020 | |
| 2021 | module_param_call(ec_event_clearing, param_set_event_clearing, param_get_event_clearing, |
| 2022 | NULL, 0644); |
| 2023 | MODULE_PARM_DESC(ec_event_clearing, "Assumed SCI_EVT clearing timing"); |
| 2024 | |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 2025 | static struct acpi_driver acpi_ec_driver = { |
| 2026 | .name = "ec", |
| 2027 | .class = ACPI_EC_CLASS, |
| 2028 | .ids = ec_device_ids, |
| 2029 | .ops = { |
| 2030 | .add = acpi_ec_add, |
| 2031 | .remove = acpi_ec_remove, |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 2032 | }, |
Lv Zheng | df45db6 | 2016-08-03 09:07:58 +0800 | [diff] [blame] | 2033 | .drv.pm = &acpi_ec_pm, |
Alexey Starikovskiy | 223883b | 2008-03-21 17:07:21 +0300 | [diff] [blame] | 2034 | }; |
| 2035 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 2036 | static inline int acpi_ec_query_init(void) |
| 2037 | { |
| 2038 | if (!ec_query_wq) { |
| 2039 | ec_query_wq = alloc_workqueue("kec_query", 0, |
| 2040 | ec_max_queries); |
| 2041 | if (!ec_query_wq) |
| 2042 | return -ENODEV; |
| 2043 | } |
| 2044 | return 0; |
| 2045 | } |
| 2046 | |
| 2047 | static inline void acpi_ec_query_exit(void) |
| 2048 | { |
| 2049 | if (ec_query_wq) { |
| 2050 | destroy_workqueue(ec_query_wq); |
| 2051 | ec_query_wq = NULL; |
| 2052 | } |
| 2053 | } |
| 2054 | |
Mika Westerberg | 8195a65 | 2018-06-18 14:17:16 +0300 | [diff] [blame] | 2055 | static const struct dmi_system_id acpi_ec_no_wakeup[] = { |
| 2056 | { |
| 2057 | .ident = "Thinkpad X1 Carbon 6th", |
| 2058 | .matches = { |
| 2059 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
Robin H. Johnson | 2c4d6ba | 2018-07-13 20:50:47 +0000 | [diff] [blame] | 2060 | DMI_MATCH(DMI_PRODUCT_FAMILY, "Thinkpad X1 Carbon 6th"), |
Mika Westerberg | 8195a65 | 2018-06-18 14:17:16 +0300 | [diff] [blame] | 2061 | }, |
| 2062 | }, |
Aaron Ma | b047c62 | 2018-07-31 18:52:39 +0800 | [diff] [blame] | 2063 | { |
Mika Westerberg | 4c3be61e | 2018-08-08 12:50:37 +0300 | [diff] [blame] | 2064 | .ident = "ThinkPad X1 Carbon 6th", |
| 2065 | .matches = { |
| 2066 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| 2067 | DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Carbon 6th"), |
| 2068 | }, |
| 2069 | }, |
| 2070 | { |
Aaron Ma | b047c62 | 2018-07-31 18:52:39 +0800 | [diff] [blame] | 2071 | .ident = "ThinkPad X1 Yoga 3rd", |
| 2072 | .matches = { |
| 2073 | DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
| 2074 | DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Yoga 3rd"), |
| 2075 | }, |
| 2076 | }, |
Mika Westerberg | 8195a65 | 2018-06-18 14:17:16 +0300 | [diff] [blame] | 2077 | { }, |
| 2078 | }; |
| 2079 | |
Bjorn Helgaas | a5f820f | 2009-03-24 16:49:48 -0600 | [diff] [blame] | 2080 | int __init acpi_ec_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | { |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 2082 | int result; |
Lv Zheng | 98529b9 | 2017-08-16 15:29:49 +0800 | [diff] [blame] | 2083 | int ecdt_fail, dsdt_fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 2085 | /* register workqueue for _Qxx evaluations */ |
| 2086 | result = acpi_ec_query_init(); |
| 2087 | if (result) |
Lv Zheng | 98529b9 | 2017-08-16 15:29:49 +0800 | [diff] [blame] | 2088 | return result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2089 | |
Mika Westerberg | 8195a65 | 2018-06-18 14:17:16 +0300 | [diff] [blame] | 2090 | /* |
| 2091 | * Disable EC wakeup on following systems to prevent periodic |
| 2092 | * wakeup from EC GPE. |
| 2093 | */ |
| 2094 | if (dmi_check_system(acpi_ec_no_wakeup)) { |
| 2095 | ec_no_wakeup = true; |
| 2096 | pr_debug("Disabling EC wakeup on suspend-to-idle\n"); |
| 2097 | } |
| 2098 | |
Lv Zheng | 98529b9 | 2017-08-16 15:29:49 +0800 | [diff] [blame] | 2099 | /* Drivers must be started after acpi_ec_query_init() */ |
Lv Zheng | 98529b9 | 2017-08-16 15:29:49 +0800 | [diff] [blame] | 2100 | dsdt_fail = acpi_bus_register_driver(&acpi_ec_driver); |
Lv Zheng | a64a62c | 2017-09-26 16:54:09 +0800 | [diff] [blame] | 2101 | /* |
| 2102 | * Register ECDT to ACPI bus only when PNP0C09 probe fails. This is |
| 2103 | * useful for platforms (confirmed on ASUS X550ZE) with valid ECDT |
| 2104 | * settings but invalid DSDT settings. |
| 2105 | * https://bugzilla.kernel.org/show_bug.cgi?id=196847 |
| 2106 | */ |
Lv Zheng | 69b957c | 2017-08-17 10:21:12 +0800 | [diff] [blame] | 2107 | ecdt_fail = acpi_ec_ecdt_start(); |
Lv Zheng | 98529b9 | 2017-08-16 15:29:49 +0800 | [diff] [blame] | 2108 | return ecdt_fail && dsdt_fail ? -ENODEV : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | } |
| 2110 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2111 | /* EC driver currently not unloadable */ |
| 2112 | #if 0 |
Len Brown | 50526df | 2005-08-11 17:32:05 -0400 | [diff] [blame] | 2113 | static void __exit acpi_ec_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | |
| 2116 | acpi_bus_unregister_driver(&acpi_ec_driver); |
Lv Zheng | e1191bd | 2016-08-03 09:00:14 +0800 | [diff] [blame] | 2117 | acpi_ec_query_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | } |
Alexey Starikovskiy | 7843932 | 2007-10-22 14:18:43 +0400 | [diff] [blame] | 2119 | #endif /* 0 */ |