drivers/led/led-uclass.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <led.h>
  12 #include <dm/root.h>
  13 #include <dm/uclass-internal.h>
  14
  15 int led_get_by_label(const char *label, struct udevice **devp)
  16 {
  17         struct udevice *dev;
  18         struct uclass *uc;
  19         int ret;
  20
  21         ret = uclass_get(UCLASS_LED, &uc);
  22         if (ret)
  23                 return ret;
  24         uclass_foreach_dev(dev, uc) {
  25                 struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
  26
  27                 /* Ignore the top-level LED node */
  28                 if (uc_plat->label && !strcmp(label, uc_plat->label))
  29                         return uclass_get_device_tail(dev, 0, devp);
  30         }
  31
  32         return -ENODEV;
  33 }
  34
  35 int led_set_state(struct udevice *dev, enum led_state_t state)
  36 {
  37         struct led_ops *ops = led_get_ops(dev);
  38
  39         if (!ops->set_state)
  40                 return -ENOSYS;
  41
  42         return ops->set_state(dev, state);
  43 }
  44
  45 enum led_state_t led_get_state(struct udevice *dev)
  46 {
  47         struct led_ops *ops = led_get_ops(dev);
  48
  49         if (!ops->get_state)
  50                 return -ENOSYS;
  51
  52         return ops->get_state(dev);
  53 }
  54
  55 #ifdef CONFIG_LED_BLINK
  56 int led_set_period(struct udevice *dev, int period_ms)
  57 {
  58         struct led_ops *ops = led_get_ops(dev);
  59
  60         if (!ops->set_period)
  61                 return -ENOSYS;
  62
  63         return ops->set_period(dev, period_ms);
  64 }
  65 #endif
  66
  67 UCLASS_DRIVER(led) = {
  68         .id             = UCLASS_LED,
  69         .name           = "led",
  70         .per_device_platdata_auto_alloc_size = sizeof(struct led_uc_plat),
  71 };