dm: button: add an uclass for button
Add a new uclass for button that implements two functions:
- button_get_by_label
- button_get_status
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/drivers/button/button-uclass.c b/drivers/button/button-uclass.c
new file mode 100644
index 0000000..1c742c2
--- /dev/null
+++ b/drivers/button/button-uclass.c
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com>
+ *
+ * Based on led-uclass.c
+ */
+
+#include <common.h>
+#include <button.h>
+#include <dm.h>
+#include <dm/uclass-internal.h>
+
+int button_get_by_label(const char *label, struct udevice **devp)
+{
+ struct udevice *dev;
+ struct uclass *uc;
+
+ uclass_id_foreach_dev(UCLASS_BUTTON, dev, uc) {
+ struct button_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
+
+ /* Ignore the top-level button node */
+ if (uc_plat->label && !strcmp(label, uc_plat->label))
+ return uclass_get_device_tail(dev, 0, devp);
+ }
+
+ return -ENODEV;
+}
+
+enum button_state_t button_get_state(struct udevice *dev)
+{
+ struct button_ops *ops = button_get_ops(dev);
+
+ if (!ops->get_state)
+ return -ENOSYS;
+
+ return ops->get_state(dev);
+}
+
+UCLASS_DRIVER(button) = {
+ .id = UCLASS_BUTTON,
+ .name = "button",
+ .per_device_platdata_auto_alloc_size = sizeof(struct button_uc_plat),
+};