drivers/led/led-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <errno.h>
  10 #include <led.h>
  11 #include <dm/root.h>
  12 #include <dm/uclass-internal.h>
  13
  14 int led_get_by_label(const char *label, struct udevice **devp)
  15 {
  16         struct udevice *dev;
  17         struct uclass *uc;
  18         int ret;
  19
  20         ret = uclass_get(UCLASS_LED, &uc);
  21         if (ret)
  22                 return ret;
  23         uclass_foreach_dev(dev, uc) {
  24                 struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
  25
  26                 /* Ignore the top-level LED node */
  27                 if (uc_plat->label && !strcmp(label, uc_plat->label))
  28                         return uclass_get_device_tail(dev, 0, devp);
  29         }
  30
  31         return -ENODEV;
  32 }
  33
  34 int led_set_state(struct udevice *dev, enum led_state_t state)
  35 {
  36         struct led_ops *ops = led_get_ops(dev);
  37
  38         if (!ops->set_state)
  39                 return -ENOSYS;
  40
  41         return ops->set_state(dev, state);
  42 }
  43
  44 enum led_state_t led_get_state(struct udevice *dev)
  45 {
  46         struct led_ops *ops = led_get_ops(dev);
  47
  48         if (!ops->get_state)
  49                 return -ENOSYS;
  50
  51         return ops->get_state(dev);
  52 }
  53
  54 #ifdef CONFIG_LED_BLINK
  55 int led_set_period(struct udevice *dev, int period_ms)
  56 {
  57         struct led_ops *ops = led_get_ops(dev);
  58
  59         if (!ops->set_period)
  60                 return -ENOSYS;
  61
  62         return ops->set_period(dev, period_ms);
  63 }
  64 #endif
  65
  66 UCLASS_DRIVER(led) = {
  67         .id             = UCLASS_LED,
  68         .name           = "led",
  69         .per_device_platdata_auto_alloc_size = sizeof(struct led_uc_plat),
  70 };