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- // 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,
- };
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