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_uclass_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_on(struct udevice *dev, int on)
  36 {
  37         struct led_ops *ops = led_get_ops(dev);
  38
  39         if (!ops->set_on)
  40                 return -ENOSYS;
  41
  42         return ops->set_on(dev, on);
  43 }
  44
  45 UCLASS_DRIVER(led) = {
  46         .id             = UCLASS_LED,
  47         .name           = "led",
  48         .per_device_platdata_auto_alloc_size = sizeof(struct led_uclass_plat),
  49 };