#ifndef __LINUX_PWM_H #define __LINUX_PWM_H #include <linux/of.h> struct pwm_device; struct seq_file; /* * pwm_request - request a PWM device */ struct pwm_device *pwm_request(int pwm_id, const char *label); /* * pwm_free - free a PWM device */ void pwm_free(struct pwm_device *pwm); /* * 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); #ifdef CONFIG_PWM struct pwm_chip; enum { PWMF_REQUESTED = 1 << 0, PWMF_ENABLED = 1 << 1, }; struct pwm_device { const char *label; unsigned long flags; unsigned int hwpwm; unsigned int pwm; struct pwm_chip *chip; void *chip_data; unsigned int period; /* in nanoseconds */ }; static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period) { if (pwm) pwm->period = period; } static inline unsigned int pwm_get_period(struct pwm_device *pwm) { return pwm ? pwm->period : 0; } /** * struct pwm_ops - PWM controller operations * @request: optional hook for requesting a PWM * @free: optional hook for freeing a PWM * @config: configure duty cycles and period length for this PWM * @enable: enable PWM output toggling * @disable: disable PWM output toggling * @dbg_show: optional routine to show contents in debugfs * @owner: helps prevent removal of modules exporting active PWMs */ struct pwm_ops { int (*request)(struct pwm_chip *chip, struct pwm_device *pwm); void (*free)(struct pwm_chip *chip, struct pwm_device *pwm); int (*config)(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns); int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm); void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm); #ifdef CONFIG_DEBUG_FS void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s); #endif struct module *owner; }; /** * struct pwm_chip - abstract a PWM controller * @dev: device providing the PWMs * @list: list node for internal use * @ops: callbacks for this PWM controller * @base: number of first PWM controlled by this chip * @npwm: number of PWMs controlled by this chip * @pwms: array of PWM devices allocated by the framework */ struct pwm_chip { struct device *dev; struct list_head list; const struct pwm_ops *ops; int base; unsigned int npwm; struct pwm_device *pwms; struct pwm_device * (*of_xlate)(struct pwm_chip *pc, const struct of_phandle_args *args); unsigned int of_pwm_n_cells; }; int pwm_set_chip_data(struct pwm_device *pwm, void *data); void *pwm_get_chip_data(struct pwm_device *pwm); int pwmchip_add(struct pwm_chip *chip); int pwmchip_remove(struct pwm_chip *chip); struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, unsigned int index, const char *label); struct pwm_device *pwm_get(struct device *dev, const char *consumer); void pwm_put(struct pwm_device *pwm); struct pwm_lookup { struct list_head list; const char *provider; unsigned int index; const char *dev_id; const char *con_id; }; #define PWM_LOOKUP(_provider, _index, _dev_id, _con_id) \ { \ .provider = _provider, \ .index = _index, \ .dev_id = _dev_id, \ .con_id = _con_id, \ } void pwm_add_table(struct pwm_lookup *table, size_t num); #endif #endif /* __LINUX_PWM_H */