| // 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 <dm/device-internal.h> |
| #include <dm/root.h> |
| #include <dm/uclass-internal.h> |
| |
| int led_get_by_label(const char *label, struct udevice **devp) |
| { |
| struct udevice *dev; |
| struct uclass *uc; |
| int ret; |
| |
| ret = uclass_get(UCLASS_LED, &uc); |
| if (ret) |
| return ret; |
| uclass_foreach_dev(dev, uc) { |
| struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev); |
| |
| /* Ignore the top-level LED node */ |
| if (uc_plat->label && !strcmp(label, uc_plat->label)) |
| return uclass_get_device_tail(dev, 0, devp); |
| } |
| |
| return -ENODEV; |
| } |
| |
| int led_set_state(struct udevice *dev, enum led_state_t state) |
| { |
| struct led_ops *ops = led_get_ops(dev); |
| |
| if (!ops->set_state) |
| return -ENOSYS; |
| |
| return ops->set_state(dev, state); |
| } |
| |
| enum led_state_t led_get_state(struct udevice *dev) |
| { |
| struct led_ops *ops = led_get_ops(dev); |
| |
| if (!ops->get_state) |
| return -ENOSYS; |
| |
| return ops->get_state(dev); |
| } |
| |
| #ifdef CONFIG_AML_LED_PWM |
| int led_set_brightness(struct udevice *dev, int brightness) |
| { |
| struct led_ops *ops = led_get_ops(dev); |
| |
| if (!ops->set_brightness) |
| return -ENOSYS; |
| |
| return ops->set_brightness(dev, brightness); |
| } |
| |
| int led_get_brightness(struct udevice *dev) |
| { |
| struct led_ops *ops = led_get_ops(dev); |
| |
| if (!ops->set_brightness) |
| return -ENOSYS; |
| |
| return ops->get_brightness(dev); |
| } |
| #endif |
| |
| #ifdef CONFIG_LED_BLINK |
| int led_set_period(struct udevice *dev, int period_ms) |
| { |
| struct led_ops *ops = led_get_ops(dev); |
| |
| if (!ops->set_period) |
| return -ENOSYS; |
| |
| return ops->set_period(dev, period_ms); |
| } |
| #endif |
| |
| int led_default_state(void) |
| { |
| struct udevice *dev; |
| struct uclass *uc; |
| const char *default_state; |
| int ret; |
| |
| ret = uclass_get(UCLASS_LED, &uc); |
| if (ret) |
| return ret; |
| for (uclass_find_first_device(UCLASS_LED, &dev); |
| dev; |
| uclass_find_next_device(&dev)) { |
| default_state = dev_read_string(dev, "default-state"); |
| if (!default_state) |
| continue; |
| ret = device_probe(dev); |
| if (ret) |
| return ret; |
| if (!strncmp(default_state, "on", 2)) |
| led_set_state(dev, LEDST_ON); |
| else if (!strncmp(default_state, "off", 3)) |
| led_set_state(dev, LEDST_OFF); |
| /* default-state = "keep" : device is only probed */ |
| } |
| |
| return ret; |
| } |
| |
| UCLASS_DRIVER(led) = { |
| .id = UCLASS_LED, |
| .name = "led", |
| .per_device_platdata_auto_alloc_size = sizeof(struct led_uc_plat), |
| }; |