| 0,0 → 1,219 |
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| #ifndef __LINUX_PWM_H |
| #define __LINUX_PWM_H |
| |
| #include <linux/err.h> |
| #include <linux/mutex.h> |
| //#include <linux/of.h> |
| |
| struct device; |
| struct pwm_device; |
| struct seq_file; |
| |
| #if IS_ENABLED(CONFIG_PWM) |
| /* |
| * 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); |
| #else |
| static inline struct pwm_device *pwm_request(int pwm_id, const char *label) |
| { |
| return ERR_PTR(-ENODEV); |
| } |
| |
| static inline void pwm_free(struct pwm_device *pwm) |
| { |
| } |
| |
| static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) |
| { |
| return -EINVAL; |
| } |
| |
| static inline int pwm_enable(struct pwm_device *pwm) |
| { |
| return -EINVAL; |
| } |
| |
| static inline void pwm_disable(struct pwm_device *pwm) |
| { |
| } |
| #endif |
| |
| struct pwm_chip; |
| |
| /** |
| * enum pwm_polarity - polarity of a PWM signal |
| * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty- |
| * cycle, followed by a low signal for the remainder of the pulse |
| * period |
| * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty- |
| * cycle, followed by a high signal for the remainder of the pulse |
| * period |
| */ |
| enum pwm_polarity { |
| PWM_POLARITY_NORMAL, |
| PWM_POLARITY_INVERSED, |
| }; |
| |
| enum { |
| PWMF_REQUESTED = 1 << 0, |
| PWMF_ENABLED = 1 << 1, |
| PWMF_EXPORTED = 1 << 2, |
| }; |
| |
| /** |
| * struct pwm_device - PWM channel object |
| * @label: name of the PWM device |
| * @flags: flags associated with the PWM device |
| * @hwpwm: per-chip relative index of the PWM device |
| * @pwm: global index of the PWM device |
| * @chip: PWM chip providing this PWM device |
| * @chip_data: chip-private data associated with the PWM device |
| * @lock: used to serialize accesses to the PWM device where necessary |
| * @period: period of the PWM signal (in nanoseconds) |
| * @duty_cycle: duty cycle of the PWM signal (in nanoseconds) |
| * @polarity: polarity of the PWM signal |
| */ |
| struct pwm_device { |
| const char *label; |
| unsigned long flags; |
| unsigned int hwpwm; |
| unsigned int pwm; |
| struct pwm_chip *chip; |
| void *chip_data; |
| struct mutex lock; |
| |
| unsigned int period; |
| unsigned int duty_cycle; |
| enum pwm_polarity polarity; |
| }; |
| |
| static inline bool pwm_is_enabled(const struct pwm_device *pwm) |
| { |
| return test_bit(PWMF_ENABLED, &pwm->flags); |
| } |
| |
| 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(const struct pwm_device *pwm) |
| { |
| return pwm ? pwm->period : 0; |
| } |
| |
| static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty) |
| { |
| if (pwm) |
| pwm->duty_cycle = duty; |
| } |
| |
| static inline unsigned int pwm_get_duty_cycle(const struct pwm_device *pwm) |
| { |
| return pwm ? pwm->duty_cycle : 0; |
| } |
| |
| /* |
| * pwm_set_polarity - configure the polarity of a PWM signal |
| */ |
| int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity); |
| |
| static inline enum pwm_polarity pwm_get_polarity(const struct pwm_device *pwm) |
| { |
| return pwm ? pwm->polarity : PWM_POLARITY_NORMAL; |
| } |
| |
| /** |
| * 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 |
| * @set_polarity: configure the polarity of 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 (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm, |
| enum pwm_polarity polarity); |
| 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; |
| }; |
| |
| #if IS_ENABLED(CONFIG_PWM) |
| int pwm_set_chip_data(struct pwm_device *pwm, void *data); |
| void *pwm_get_chip_data(struct pwm_device *pwm); |
| struct pwm_device *pwm_get(struct device *dev, const char *con_id); |
| struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id); |
| void pwm_put(struct pwm_device *pwm); |
| |
| struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id); |
| void devm_pwm_put(struct device *dev, struct pwm_device *pwm); |
| |
| bool pwm_can_sleep(struct pwm_device *pwm); |
| #else |
| static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data) |
| { |
| return -EINVAL; |
| } |
| |
| static inline void *pwm_get_chip_data(struct pwm_device *pwm) |
| { |
| return NULL; |
| } |
| static inline struct pwm_device *pwm_get(struct device *dev, |
| const char *consumer) |
| { |
| return ERR_PTR(-ENODEV); |
| } |
| static inline void pwm_put(struct pwm_device *pwm) |
| { |
| } |
| |
| static inline struct pwm_device *devm_pwm_get(struct device *dev, |
| const char *consumer) |
| { |
| return ERR_PTR(-ENODEV); |
| } |
| static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm) |
| { |
| } |
| |
| static inline bool pwm_can_sleep(struct pwm_device *pwm) |
| { |
| return false; |
| } |
| #endif |
| |
| #endif /* __LINUX_PWM_H */ |