blob: b67ab13d2e2dcd0a2df23ee84524ae73f17ee5df (
plain)
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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __PWM_H
#define __PWM_H
#include <dt-bindings/pwm/pwm.h>
struct pwm_device;
struct device_d;
#define PWM_POLARITY_NORMAL 0
/*
* struct pwm_state - state of a PWM channel
* @period_ns: PWM period (in nanoseconds)
* @duty_ns: PWM duty cycle (in nanoseconds)
* @polarity: PWM polarity
* @p_enable: PWM enabled status
*/
struct pwm_state {
unsigned int period_ns;
unsigned int duty_ns;
unsigned int polarity;
unsigned int p_enable;
};
/*
* pwm_request - request a PWM device
*/
struct pwm_device *pwm_request(const char *pwmname);
struct pwm_device *of_pwm_request(struct device_node *np, const char *con_id);
/*
* pwm_free - free a PWM device
*/
void pwm_free(struct pwm_device *pwm);
/*
* pwm_init_state - prepare a new state from device tree args
*/
void pwm_init_state(const struct pwm_device *pwm,
struct pwm_state *state);
/*
* pwm_config - change a PWM device configuration
*/
int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state);
/*
* pwm_config - change a PWM device configuration
*/
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
/*
* pwm_enable - start a PWM output toggling
*/
int pwm_enable(struct pwm_device *pwm);
/*
* pwm_disable - stop a PWM output toggling
*/
void pwm_disable(struct pwm_device *pwm);
unsigned int pwm_get_period(struct pwm_device *pwm);
struct pwm_chip;
/**
* pwm_get_state() - retrieve the current PWM state
* @pwm: PWM device
* @state: state to fill with the current PWM state
*/
void pwm_get_state(const struct pwm_device *pwm, struct pwm_state *state);
/**
* pwm_apply_state() - apply the passed PWM state
* @pwm: PWM device
* @state: state to apply to pwm device
*/
int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state);
/**
* struct pwm_ops - PWM operations
* @request: optional hook for requesting a PWM
* @free: optional hook for freeing a PWM
* @apply: apply specified pwm state
*/
struct pwm_ops {
int (*request)(struct pwm_chip *chip);
void (*free)(struct pwm_chip *chip);
int (*apply)(struct pwm_chip *chip, const struct pwm_state *state);
};
/**
* struct pwm_chip - abstract a PWM
* @id: The id of this pwm
* @devname: unique identifier for this pwm
* @ops: The callbacks for this PWM
* @state: current state of the PWM
*/
struct pwm_chip {
int id;
const char *devname;
const struct pwm_ops *ops;
struct pwm_state state;
};
int pwmchip_add(struct pwm_chip *chip, struct device_d *dev);
int pwmchip_remove(struct pwm_chip *chip);
#endif /* __PWM_H */
|
