diff options
Diffstat (limited to 'include/linux/pwm.h')
| -rw-r--r-- | include/linux/pwm.h | 108 |
1 files changed, 106 insertions, 2 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 21d076c5089e..112b31436848 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -1,11 +1,13 @@ #ifndef __LINUX_PWM_H #define __LINUX_PWM_H +#include <linux/err.h> #include <linux/of.h> struct pwm_device; struct seq_file; +#if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM) /* * pwm_request - request a PWM device */ @@ -30,10 +32,47 @@ 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 -#ifdef CONFIG_PWM 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, @@ -61,11 +100,17 @@ static inline unsigned int pwm_get_period(struct pwm_device *pwm) return pwm ? pwm->period : 0; } +/* + * pwm_set_polarity - configure the polarity of a PWM signal + */ +int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity); + /** * 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 @@ -79,6 +124,9 @@ struct pwm_ops { 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, @@ -113,6 +161,7 @@ struct pwm_chip { unsigned int of_pwm_n_cells; }; +#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); @@ -125,6 +174,57 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, struct pwm_device *pwm_get(struct device *dev, const char *consumer); void pwm_put(struct pwm_device *pwm); +struct pwm_device *devm_pwm_get(struct device *dev, const char *consumer); +void devm_pwm_put(struct device *dev, 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 int pwmchip_add(struct pwm_chip *chip) +{ + return -EINVAL; +} + +static inline int pwmchip_remove(struct pwm_chip *chip) +{ + return -EINVAL; +} + +static inline struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, + unsigned int index, + const char *label) +{ + return ERR_PTR(-ENODEV); +} + +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) +{ +} +#endif + struct pwm_lookup { struct list_head list; const char *provider; @@ -141,8 +241,12 @@ struct pwm_lookup { .con_id = _con_id, \ } +#if IS_ENABLED(CONFIG_PWM) void pwm_add_table(struct pwm_lookup *table, size_t num); - +#else +static inline void pwm_add_table(struct pwm_lookup *table, size_t num) +{ +} #endif #endif /* __LINUX_PWM_H */ |