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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (c) 2015 Google, Inc
- * Written by Simon Glass <sjg@chromium.org>
- */
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <led.h>
- #include <log.h>
- #include <malloc.h>
- #include <asm/gpio.h>
- #include <dm/lists.h>
- struct led_gpio_priv {
- struct gpio_desc gpio;
- };
- static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
- {
- struct led_gpio_priv *priv = dev_get_priv(dev);
- int ret;
- if (!dm_gpio_is_valid(&priv->gpio))
- return -EREMOTEIO;
- switch (state) {
- case LEDST_OFF:
- case LEDST_ON:
- break;
- case LEDST_TOGGLE:
- ret = dm_gpio_get_value(&priv->gpio);
- if (ret < 0)
- return ret;
- state = !ret;
- break;
- default:
- return -ENOSYS;
- }
- return dm_gpio_set_value(&priv->gpio, state);
- }
- static enum led_state_t gpio_led_get_state(struct udevice *dev)
- {
- struct led_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 ? LEDST_ON : LEDST_OFF;
- }
- static int led_gpio_probe(struct udevice *dev)
- {
- struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
- struct led_gpio_priv *priv = dev_get_priv(dev);
- int ret;
- /* Ignore the top-level LED node */
- if (!uc_plat->label)
- return 0;
- ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
- if (ret)
- return ret;
- return 0;
- }
- static int led_gpio_remove(struct udevice *dev)
- {
- /*
- * The GPIO driver may have already been removed. We will need to
- * address this more generally.
- */
- #ifndef CONFIG_SANDBOX
- struct led_gpio_priv *priv = dev_get_priv(dev);
- if (dm_gpio_is_valid(&priv->gpio))
- dm_gpio_free(dev, &priv->gpio);
- #endif
- return 0;
- }
- static int led_gpio_bind(struct udevice *parent)
- {
- struct udevice *dev;
- ofnode node;
- int ret;
- dev_for_each_subnode(node, parent) {
- struct led_uc_plat *uc_plat;
- const char *label;
- label = ofnode_read_string(node, "label");
- if (!label)
- label = ofnode_get_name(node);
- ret = device_bind_driver_to_node(parent, "gpio_led",
- 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 led_ops gpio_led_ops = {
- .set_state = gpio_led_set_state,
- .get_state = gpio_led_get_state,
- };
- static const struct udevice_id led_gpio_ids[] = {
- { .compatible = "gpio-leds" },
- { }
- };
- U_BOOT_DRIVER(led_gpio) = {
- .name = "gpio_led",
- .id = UCLASS_LED,
- .of_match = led_gpio_ids,
- .ops = &gpio_led_ops,
- .priv_auto_alloc_size = sizeof(struct led_gpio_priv),
- .bind = led_gpio_bind,
- .probe = led_gpio_probe,
- .remove = led_gpio_remove,
- };
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