1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2015 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __LED_H
#define __LED_H
struct udevice;
enum led_state_t {
LEDST_OFF = 0,
LEDST_ON = 1,
LEDST_TOGGLE,
#ifdef CONFIG_LED_BLINK
LEDST_BLINK,
#endif
LEDST_COUNT,
};
/**
* struct led_uc_plat - Platform data the uclass stores about each device
*
* @label: LED label
* @default_state: LED default state
*/
struct led_uc_plat {
const char *label;
enum led_state_t default_state;
};
/**
* struct led_uc_priv - Private data the uclass stores about each device
*
* @period_ms: Flash period in milliseconds
*/
struct led_uc_priv {
int period_ms;
};
struct led_ops {
/**
* set_state() - set the state of an LED
*
* @dev: LED device to change
* @state: LED state to set
* @return 0 if OK, -ve on error
*/
int (*set_state)(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* @return LED state led_state_t, or -ve on error
*/
enum led_state_t (*get_state)(struct udevice *dev);
#ifdef CONFIG_LED_BLINK
/**
* led_set_period() - set the blink period of an LED
*
* Thie records the period if supported, or returns -ENOSYS if not.
* To start the LED blinking, use set_state().
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* @return 0 if OK, -ve on error
*/
int (*set_period)(struct udevice *dev, int period_ms);
#endif
};
#define led_get_ops(dev) ((struct led_ops *)(dev)->driver->ops)
/**
* led_get_by_label() - Find an LED device by label
*
* @label: LED label to look up
* @devp: Returns the associated device, if found
* Return: 0 if found, -ENODEV if not found, other -ve on error
*/
int led_get_by_label(const char *label, struct udevice **devp);
/**
* led_set_state() - set the state of an LED
*
* @dev: LED device to change
* @state: LED state to set
* Return: 0 if OK, -ve on error
*/
int led_set_state(struct udevice *dev, enum led_state_t state);
/**
* led_get_state() - get the state of an LED
*
* @dev: LED device to change
* Return: LED state led_state_t, or -ve on error
*/
enum led_state_t led_get_state(struct udevice *dev);
/**
* led_set_period() - set the blink period of an LED
*
* @dev: LED device to change
* @period_ms: LED blink period in milliseconds
* Return: 0 if OK, -ve on error
*/
int led_set_period(struct udevice *dev, int period_ms);
#endif
|
