|
@@ -0,0 +1,112 @@
|
|
|
+// SPDX-License-Identifier: GPL-2.0
|
|
|
+/*
|
|
|
+ * Copyright (C) 2020 Philippe Reynes <philippe.reynes@softathome.com>
|
|
|
+ */
|
|
|
+
|
|
|
+#include <common.h>
|
|
|
+#include <button.h>
|
|
|
+#include <dm.h>
|
|
|
+#include <dm/lists.h>
|
|
|
+#include <dm/uclass-internal.h>
|
|
|
+#include <log.h>
|
|
|
+#include <asm/gpio.h>
|
|
|
+
|
|
|
+struct button_gpio_priv {
|
|
|
+ struct gpio_desc gpio;
|
|
|
+};
|
|
|
+
|
|
|
+static enum button_state_t button_gpio_get_state(struct udevice *dev)
|
|
|
+{
|
|
|
+ struct button_gpio_priv *priv = dev_get_priv(dev);
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (!dm_gpio_is_valid(&priv->gpio))
|
|
|
+ return -EREMOTEIO;
|
|
|
+ ret = dm_gpio_get_value(&priv->gpio);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ return ret ? BUTTON_ON : BUTTON_OFF;
|
|
|
+}
|
|
|
+
|
|
|
+static int button_gpio_probe(struct udevice *dev)
|
|
|
+{
|
|
|
+ struct button_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
|
|
|
+ struct button_gpio_priv *priv = dev_get_priv(dev);
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ /* Ignore the top-level button node */
|
|
|
+ if (!uc_plat->label)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_IN);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int button_gpio_remove(struct udevice *dev)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * The GPIO driver may have already been removed. We will need to
|
|
|
+ * address this more generally.
|
|
|
+ */
|
|
|
+ if (!IS_ENABLED(CONFIG_SANDBOX)) {
|
|
|
+ struct button_gpio_priv *priv = dev_get_priv(dev);
|
|
|
+
|
|
|
+ if (dm_gpio_is_valid(&priv->gpio))
|
|
|
+ dm_gpio_free(dev, &priv->gpio);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int button_gpio_bind(struct udevice *parent)
|
|
|
+{
|
|
|
+ struct udevice *dev;
|
|
|
+ ofnode node;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ dev_for_each_subnode(node, parent) {
|
|
|
+ struct button_uc_plat *uc_plat;
|
|
|
+ const char *label;
|
|
|
+
|
|
|
+ label = ofnode_read_string(node, "label");
|
|
|
+ if (!label) {
|
|
|
+ debug("%s: node %s has no label\n", __func__,
|
|
|
+ ofnode_get_name(node));
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ ret = device_bind_driver_to_node(parent, "button_gpio",
|
|
|
+ ofnode_get_name(node),
|
|
|
+ node, &dev);
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+ uc_plat = dev_get_uclass_platdata(dev);
|
|
|
+ uc_plat->label = label;
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct button_ops button_gpio_ops = {
|
|
|
+ .get_state = button_gpio_get_state,
|
|
|
+};
|
|
|
+
|
|
|
+static const struct udevice_id button_gpio_ids[] = {
|
|
|
+ { .compatible = "gpio-keys" },
|
|
|
+ { .compatible = "gpio-keys-polled" },
|
|
|
+ { }
|
|
|
+};
|
|
|
+
|
|
|
+U_BOOT_DRIVER(button_gpio) = {
|
|
|
+ .name = "button_gpio",
|
|
|
+ .id = UCLASS_BUTTON,
|
|
|
+ .of_match = button_gpio_ids,
|
|
|
+ .ops = &button_gpio_ops,
|
|
|
+ .priv_auto_alloc_size = sizeof(struct button_gpio_priv),
|
|
|
+ .bind = button_gpio_bind,
|
|
|
+ .probe = button_gpio_probe,
|
|
|
+ .remove = button_gpio_remove,
|
|
|
+};
|