include/led.h

   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 #ifndef __LED_H
   8 #define __LED_H
   9
  10 /**
  11  * struct led_uc_plat - Platform data the uclass stores about each device
  12  *
  13  * @label:      LED label
  14  */
  15 struct led_uc_plat {
  16         const char *label;
  17 };
  18
  19 /**
  20  * struct led_uc_priv - Private data the uclass stores about each device
  21  *
  22  * @period_ms:  Flash period in milliseconds
  23  */
  24 struct led_uc_priv {
  25         int period_ms;
  26 };
  27
  28 enum led_state_t {
  29         LEDST_OFF = 0,
  30         LEDST_ON = 1,
  31         LEDST_TOGGLE,
  32 #ifdef CONFIG_LED_BLINK
  33         LEDST_BLINK,
  34 #endif
  35
  36         LEDST_COUNT,
  37 };
  38
  39 struct led_ops {
  40         /**
  41          * set_state() - set the state of an LED
  42          *
  43          * @dev:        LED device to change
  44          * @state:      LED state to set
  45          * @return 0 if OK, -ve on error
  46          */
  47         int (*set_state)(struct udevice *dev, enum led_state_t state);
  48
  49         /**
  50          * led_get_state() - get the state of an LED
  51          *
  52          * @dev:        LED device to change
  53          * @return LED state led_state_t, or -ve on error
  54          */
  55         enum led_state_t (*get_state)(struct udevice *dev);
  56
  57 #ifdef CONFIG_LED_BLINK
  58         /**
  59          * led_set_period() - set the blink period of an LED
  60          *
  61          * Thie records the period if supported, or returns -ENOSYS if not.
  62          * To start the LED blinking, use set_state().
  63          *
  64          * @dev:        LED device to change
  65          * @period_ms:  LED blink period in milliseconds
  66          * @return 0 if OK, -ve on error
  67          */
  68         int (*set_period)(struct udevice *dev, int period_ms);
  69 #endif
  70 };
  71
  72 #define led_get_ops(dev)        ((struct led_ops *)(dev)->driver->ops)
  73
  74 /**
  75  * led_get_by_label() - Find an LED device by label
  76  *
  77  * @label:      LED label to look up
  78  * @devp:       Returns the associated device, if found
  79  * @return 0 if found, -ENODEV if not found, other -ve on error
  80  */
  81 int led_get_by_label(const char *label, struct udevice **devp);
  82
  83 /**
  84  * led_set_state() - set the state of an LED
  85  *
  86  * @dev:        LED device to change
  87  * @state:      LED state to set
  88  * @return 0 if OK, -ve on error
  89  */
  90 int led_set_state(struct udevice *dev, enum led_state_t state);
  91
  92 /**
  93  * led_get_state() - get the state of an LED
  94  *
  95  * @dev:        LED device to change
  96  * @return LED state led_state_t, or -ve on error
  97  */
  98 enum led_state_t led_get_state(struct udevice *dev);
  99
 100 /**
 101  * led_set_period() - set the blink period of an LED
 102  *
 103  * @dev:        LED device to change
 104  * @period_ms:  LED blink period in milliseconds
 105  * @return 0 if OK, -ve on error
 106  */
 107 int led_set_period(struct udevice *dev, int period_ms);
 108
 109 /**
 110  * led_default_state() - set the default state for all the LED
 111  *
 112  * This enables all leds which have default state.
 113  * see Documentation/devicetree/bindings/leds/common.txt
 114  *
 115  */
 116 int led_default_state(void);
 117
 118 #endif