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/device-internal.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 int led_default_state(void)
  68 {
  69         struct udevice *dev;
  70         struct uclass *uc;
  71         const char *default_state;
  72         int ret;
  73
  74         ret = uclass_get(UCLASS_LED, &uc);
  75         if (ret)
  76                 return ret;
  77         for (uclass_find_first_device(UCLASS_LED, &dev);
  78              dev;
  79              uclass_find_next_device(&dev)) {
  80                 default_state = dev_read_string(dev, "default-state");
  81                 if (!default_state)
  82                         continue;
  83                 ret = device_probe(dev);
  84                 if (ret)
  85                         return ret;
  86                 if (!strncmp(default_state, "on", 2))
  87                         led_set_state(dev, LEDST_ON);
  88                 else if (!strncmp(default_state, "off", 3))
  89                         led_set_state(dev, LEDST_OFF);
  90                 /* default-state = "keep" : device is only probed */
  91         }
  92
  93         return ret;
  94 }
  95
  96 UCLASS_DRIVER(led) = {
  97         .id             = UCLASS_LED,
  98         .name           = "led",
  99         .per_device_platdata_auto_alloc_size = sizeof(struct led_uc_plat),
 100 };