LXR uboot/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#define LOG_CATEGORY UCLASS_LED
   8
   9#include <common.h>
  10#include <dm.h>
  11#include <errno.h>
  12#include <led.h>
  13#include <dm/device-internal.h>
  14#include <dm/root.h>
  15#include <dm/uclass-internal.h>
  16
  17int led_get_by_label(const char *label, struct udevice **devp)
  18{
  19        struct udevice *dev;
  20        struct uclass *uc;
  21        int ret;
  22
  23        ret = uclass_get(UCLASS_LED, &uc);
  24        if (ret)
  25                return ret;
  26        uclass_foreach_dev(dev, uc) {
  27                struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
  28
  29                /* Ignore the top-level LED node */
  30                if (uc_plat->label && !strcmp(label, uc_plat->label))
  31                        return uclass_get_device_tail(dev, 0, devp);
  32        }
  33
  34        return -ENODEV;
  35}
  36
  37int led_set_state(struct udevice *dev, enum led_state_t state)
  38{
  39        struct led_ops *ops = led_get_ops(dev);
  40
  41        if (!ops->set_state)
  42                return -ENOSYS;
  43
  44        return ops->set_state(dev, state);
  45}
  46
  47enum led_state_t led_get_state(struct udevice *dev)
  48{
  49        struct led_ops *ops = led_get_ops(dev);
  50
  51        if (!ops->get_state)
  52                return -ENOSYS;
  53
  54        return ops->get_state(dev);
  55}
  56
  57#ifdef CONFIG_LED_BLINK
  58int led_set_period(struct udevice *dev, int period_ms)
  59{
  60        struct led_ops *ops = led_get_ops(dev);
  61
  62        if (!ops->set_period)
  63                return -ENOSYS;
  64
  65        return ops->set_period(dev, period_ms);
  66}
  67#endif
  68
  69static int led_post_bind(struct udevice *dev)
  70{
  71        struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
  72        const char *default_state;
  73
  74        uc_plat->label = dev_read_string(dev, "label");
  75        if (!uc_plat->label)
  76                uc_plat->label = ofnode_get_name(dev_ofnode(dev));
  77
  78        uc_plat->default_state = LEDST_COUNT;
  79
  80        default_state = dev_read_string(dev, "default-state");
  81        if (!default_state)
  82                return 0;
  83
  84        if (!strncmp(default_state, "on", 2))
  85                uc_plat->default_state = LEDST_ON;
  86        else if (!strncmp(default_state, "off", 3))
  87                uc_plat->default_state = LEDST_OFF;
  88        else
  89                return 0;
  90
  91        /*
  92         * In case the LED has default-state DT property, trigger
  93         * probe() to configure its default state during startup.
  94         */
  95        dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);
  96
  97        return 0;
  98}
  99
 100static int led_post_probe(struct udevice *dev)
 101{
 102        struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
 103
 104        if (uc_plat->default_state == LEDST_ON ||
 105            uc_plat->default_state == LEDST_OFF)
 106                led_set_state(dev, uc_plat->default_state);
 107
 108        return 0;
 109}
 110
 111UCLASS_DRIVER(led) = {
 112        .id             = UCLASS_LED,
 113        .name           = "led",
 114        .per_device_plat_auto   = sizeof(struct led_uc_plat),
 115        .post_bind      = led_post_bind,
 116        .post_probe     = led_post_probe,
 117};
 118