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pwm: Add pwm_can_sleep() as exported API to users

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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>
This commit is contained in:
Florian Vaussard 2013-01-28 15:00:57 +01:00 committed by Thierry Reding
parent 0132267d65
commit 6e69ab1361
2 changed files with 22 additions and 0 deletions
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12
drivers/pwm/core.c
View File

@ -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)
{

10
include/linux/pwm.h
View File

@ -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 {