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1a189b97 RK |
1 | #ifndef __LINUX_PWM_H |
2 | #define __LINUX_PWM_H | |
3 | ||
4 | struct pwm_device; | |
62099abf | 5 | struct seq_file; |
1a189b97 RK |
6 | |
7 | /* | |
8 | * pwm_request - request a PWM device | |
9 | */ | |
10 | struct pwm_device *pwm_request(int pwm_id, const char *label); | |
11 | ||
12 | /* | |
13 | * pwm_free - free a PWM device | |
14 | */ | |
15 | void pwm_free(struct pwm_device *pwm); | |
16 | ||
17 | /* | |
18 | * pwm_config - change a PWM device configuration | |
19 | */ | |
20 | int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns); | |
21 | ||
22 | /* | |
23 | * pwm_enable - start a PWM output toggling | |
24 | */ | |
25 | int pwm_enable(struct pwm_device *pwm); | |
26 | ||
27 | /* | |
28 | * pwm_disable - stop a PWM output toggling | |
29 | */ | |
30 | void pwm_disable(struct pwm_device *pwm); | |
31 | ||
0c2498f1 SH |
32 | #ifdef CONFIG_PWM |
33 | struct pwm_chip; | |
34 | ||
f051c466 TR |
35 | enum { |
36 | PWMF_REQUESTED = 1 << 0, | |
37 | PWMF_ENABLED = 1 << 1, | |
38 | }; | |
39 | ||
40 | struct pwm_device { | |
41 | const char *label; | |
42 | unsigned long flags; | |
43 | unsigned int hwpwm; | |
44 | unsigned int pwm; | |
45 | struct pwm_chip *chip; | |
46 | void *chip_data; | |
47 | ||
48 | unsigned int period; /* in nanoseconds */ | |
49 | }; | |
50 | ||
51 | static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period) | |
52 | { | |
53 | if (pwm) | |
54 | pwm->period = period; | |
55 | } | |
56 | ||
57 | static inline unsigned int pwm_get_period(struct pwm_device *pwm) | |
58 | { | |
59 | return pwm ? pwm->period : 0; | |
60 | } | |
61 | ||
0c2498f1 SH |
62 | /** |
63 | * struct pwm_ops - PWM controller operations | |
64 | * @request: optional hook for requesting a PWM | |
65 | * @free: optional hook for freeing a PWM | |
66 | * @config: configure duty cycles and period length for this PWM | |
67 | * @enable: enable PWM output toggling | |
68 | * @disable: disable PWM output toggling | |
62099abf | 69 | * @dbg_show: optional routine to show contents in debugfs |
0c2498f1 SH |
70 | * @owner: helps prevent removal of modules exporting active PWMs |
71 | */ | |
72 | struct pwm_ops { | |
f051c466 TR |
73 | int (*request)(struct pwm_chip *chip, |
74 | struct pwm_device *pwm); | |
75 | void (*free)(struct pwm_chip *chip, | |
76 | struct pwm_device *pwm); | |
77 | int (*config)(struct pwm_chip *chip, | |
78 | struct pwm_device *pwm, | |
79 | int duty_ns, int period_ns); | |
80 | int (*enable)(struct pwm_chip *chip, | |
81 | struct pwm_device *pwm); | |
82 | void (*disable)(struct pwm_chip *chip, | |
83 | struct pwm_device *pwm); | |
62099abf TR |
84 | #ifdef CONFIG_DEBUG_FS |
85 | void (*dbg_show)(struct pwm_chip *chip, | |
86 | struct seq_file *s); | |
87 | #endif | |
0c2498f1 SH |
88 | struct module *owner; |
89 | }; | |
90 | ||
91 | /** | |
f051c466 TR |
92 | * struct pwm_chip - abstract a PWM controller |
93 | * @dev: device providing the PWMs | |
94 | * @list: list node for internal use | |
95 | * @ops: callbacks for this PWM controller | |
96 | * @base: number of first PWM controlled by this chip | |
97 | * @npwm: number of PWMs controlled by this chip | |
98 | * @pwms: array of PWM devices allocated by the framework | |
0c2498f1 SH |
99 | */ |
100 | struct pwm_chip { | |
f051c466 TR |
101 | struct device *dev; |
102 | struct list_head list; | |
103 | const struct pwm_ops *ops; | |
104 | int base; | |
105 | unsigned int npwm; | |
106 | ||
107 | struct pwm_device *pwms; | |
0c2498f1 SH |
108 | }; |
109 | ||
f051c466 TR |
110 | int pwm_set_chip_data(struct pwm_device *pwm, void *data); |
111 | void *pwm_get_chip_data(struct pwm_device *pwm); | |
112 | ||
0c2498f1 SH |
113 | int pwmchip_add(struct pwm_chip *chip); |
114 | int pwmchip_remove(struct pwm_chip *chip); | |
f051c466 TR |
115 | struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, |
116 | unsigned int index, | |
117 | const char *label); | |
0c2498f1 SH |
118 | #endif |
119 | ||
5243ef8b | 120 | #endif /* __LINUX_PWM_H */ |