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Commit 6e69ab13 authored by Florian Vaussard's avatar Florian Vaussard Committed by Thierry Reding
Browse files

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: default avatarFlorian Vaussard <florian.vaussard@epfl.ch>
Reviewed-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
parent 0132267d

drivers/pwm/core.c

+12 −0
Original line number Diff line number Diff line
@@ -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)

{

include/linux/pwm.h

+10 −0
Original line number Diff line number Diff line
@@ -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 {