diff options
| author | Lee Jones <lee.jones@linaro.org> | 2016-06-08 11:21:23 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2016-06-10 16:01:35 +0200 |
| commit | 3a3d1a4e32ab47323d7b8c8b7631a8d36a3098b2 (patch) | |
| tree | a79165beca06b134c36ac6dd6ebbcd82e36d3206 /include | |
| parent | Linux 4.7-rc1 (diff) | |
| download | linux-3a3d1a4e32ab47323d7b8c8b7631a8d36a3098b2.tar.xz linux-3a3d1a4e32ab47323d7b8c8b7631a8d36a3098b2.zip | |
pwm: Add PWM capture support
Supply a PWM capture callback op in order to pass back information
obtained by running analysis on a PWM signal. This would normally (at
least during testing) be called from the sysfs routines with a view to
printing out PWM capture data which has been encoded into a string.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
[thierry.reding@gmail.com: make capture data unsigned int for symmetry]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pwm.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 17018f3c066e..8402b5dd3e06 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -5,7 +5,9 @@ #include <linux/mutex.h> #include <linux/of.h> +struct pwm_capture; struct seq_file; + struct pwm_chip; /** @@ -153,6 +155,7 @@ static inline void pwm_get_args(const struct pwm_device *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 + * @capture: capture and report PWM signal * @enable: enable PWM output toggling * @disable: disable PWM output toggling * @apply: atomically apply a new PWM config. The state argument @@ -172,6 +175,8 @@ struct pwm_ops { int duty_ns, int period_ns); int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm, enum pwm_polarity polarity); + int (*capture)(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_capture *result, unsigned long timeout); int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm); void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm); int (*apply)(struct pwm_chip *chip, struct pwm_device *pwm, @@ -212,6 +217,16 @@ struct pwm_chip { bool can_sleep; }; +/** + * struct pwm_capture - PWM capture data + * @period: period of the PWM signal (in nanoseconds) + * @duty_cycle: duty cycle of the PWM signal (in nanoseconds) + */ +struct pwm_capture { + unsigned int period; + unsigned int duty_cycle; +}; + #if IS_ENABLED(CONFIG_PWM) /* PWM user APIs */ struct pwm_device *pwm_request(int pwm_id, const char *label); @@ -322,6 +337,8 @@ static inline void pwm_disable(struct pwm_device *pwm) /* PWM provider APIs */ +int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, + unsigned long timeout); int pwm_set_chip_data(struct pwm_device *pwm, void *data); void *pwm_get_chip_data(struct pwm_device *pwm); @@ -373,6 +390,13 @@ static inline int pwm_config(struct pwm_device *pwm, int duty_ns, return -EINVAL; } +static inline int pwm_capture(struct pwm_device *pwm, + struct pwm_capture *result, + unsigned long timeout) +{ + return -EINVAL; +} + static inline int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity) { |