8 * pwm_request - request a PWM device
10 struct pwm_device *pwm_request(int pwm_id, const char *label);
13 * pwm_free - free a PWM device
15 void pwm_free(struct pwm_device *pwm);
18 * pwm_config - change a PWM device configuration
20 int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
23 * pwm_enable - start a PWM output toggling
25 int pwm_enable(struct pwm_device *pwm);
28 * pwm_disable - stop a PWM output toggling
30 void pwm_disable(struct pwm_device *pwm);
36 PWMF_REQUESTED = 1 << 0,
37 PWMF_ENABLED = 1 << 1,
45 struct pwm_chip *chip;
48 unsigned int period; /* in nanoseconds */
51 static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)
57 static inline unsigned int pwm_get_period(struct pwm_device *pwm)
59 return pwm ? pwm->period : 0;
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
69 * @dbg_show: optional routine to show contents in debugfs
70 * @owner: helps prevent removal of modules exporting active PWMs
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);
84 #ifdef CONFIG_DEBUG_FS
85 void (*dbg_show)(struct pwm_chip *chip,
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
102 struct list_head list;
103 const struct pwm_ops *ops;
107 struct pwm_device *pwms;
110 int pwm_set_chip_data(struct pwm_device *pwm, void *data);
111 void *pwm_get_chip_data(struct pwm_device *pwm);
113 int pwmchip_add(struct pwm_chip *chip);
114 int pwmchip_remove(struct pwm_chip *chip);
115 struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
120 #endif /* __LINUX_PWM_H */