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| author | Florian Vaussard <florian.vaussard@epfl.ch> | 2013-01-28 18:00:57 +0400 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@avionic-design.de> | 2013-01-30 12:12:18 +0400 |
| commit | 6e69ab1361c44e3ee1398158b56d114b1aef8179 (patch) | |
| tree | 44994b7b6cdfebaf1de44473597bb5a9adf2f912 | |
| parent | 0132267d659107616eb044777f1b0be55381129a (diff) | |
| download | linux-6e69ab1361c44e3ee1398158b56d114b1aef8179.tar.xz | |
pwm: Add pwm_can_sleep() as exported API to users
Calls to some external PWM chips can sleep. To help users,
add pwm_can_sleep() API.
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Florian Vaussard <florian.vaussard@epfl.ch>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
| -rw-r--r-- | drivers/pwm/core.c | 12 | ||||
| -rw-r--r-- | include/linux/pwm.h | 10 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 903138b18842..ffbef95e88dc 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -733,6 +733,18 @@ void devm_pwm_put(struct device *dev, struct pwm_device *pwm) } EXPORT_SYMBOL_GPL(devm_pwm_put); +/** + * pwm_can_sleep() - report whether PWM access will sleep + * @pwm: PWM device + * + * It returns true if accessing the PWM can sleep, false otherwise. + */ +bool pwm_can_sleep(struct pwm_device *pwm) +{ + return pwm->chip->can_sleep; +} +EXPORT_SYMBOL_GPL(pwm_can_sleep); + #ifdef CONFIG_DEBUG_FS static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s) { diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 6d661f32e0e4..3fef47733ea3 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -146,6 +146,8 @@ struct pwm_ops { * @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 + * @can_sleep: must be true if the .config(), .enable() or .disable() + * operations may sleep */ struct pwm_chip { struct device *dev; @@ -159,6 +161,7 @@ struct pwm_chip { struct pwm_device * (*of_xlate)(struct pwm_chip *pc, const struct of_phandle_args *args); unsigned int of_pwm_n_cells; + bool can_sleep; }; #if IS_ENABLED(CONFIG_PWM) @@ -179,6 +182,8 @@ 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); + +bool pwm_can_sleep(struct pwm_device *pwm); #else static inline int pwm_set_chip_data(struct pwm_device *pwm, void *data) { @@ -226,6 +231,11 @@ static inline struct pwm_device *devm_pwm_get(struct device *dev, 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 struct pwm_lookup { |