diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2012-12-21 09:43:59 (GMT) |
|---|---|---|
| committer | Bryan Wu <cooloney@gmail.com> | 2013-02-02 01:47:05 (GMT) |
| commit | 261a5edd3ac77ecb4b33310a1dd1ed8d656f0569 (patch) | |
| tree | 61e966d8cdd8c116f128cbe3843841661f0f254c | |
| parent | 8eb9612799605a7988d1c97cdc5980a5b8f04c56 (diff) | |
| download | linux-fsl-qoriq-261a5edd3ac77ecb4b33310a1dd1ed8d656f0569.tar.xz | |
pwm: Add devm_of_pwm_get() as exported API for users
When booted with DT users can use devm version of of_pwm_get() to benefit
from automatic resource release.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
| -rw-r--r-- | drivers/pwm/core.c | 30 | ||||
| -rw-r--r-- | include/linux/pwm.h | 9 |
2 files changed, 39 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 3cb741d..4a13da4 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -708,6 +708,36 @@ struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id) } EXPORT_SYMBOL_GPL(devm_pwm_get); +/** + * devm_of_pwm_get() - resource managed of_pwm_get() + * @dev: device for PWM consumer + * @np: device node to get the PWM from + * @con_id: consumer name + * + * This function performs like of_pwm_get() but the acquired PWM device will + * automatically be released on driver detach. + */ +struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np, + const char *con_id) +{ + struct pwm_device **ptr, *pwm; + + ptr = devres_alloc(devm_pwm_release, sizeof(**ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + pwm = of_pwm_get(np, con_id); + if (!IS_ERR(pwm)) { + *ptr = pwm; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return pwm; +} +EXPORT_SYMBOL_GPL(devm_of_pwm_get); + static int devm_pwm_match(struct device *dev, void *res, void *data) { struct pwm_device **p = res; diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 76a1959..70655a2 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -179,6 +179,8 @@ struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id); void pwm_put(struct pwm_device *pwm); struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id); +struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np, + const char *con_id); 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) @@ -230,6 +232,13 @@ static inline struct pwm_device *devm_pwm_get(struct device *dev, return ERR_PTR(-ENODEV); } +static inline struct pwm_device *devm_of_pwm_get(struct device *dev, + struct device_node *np, + const char *con_id) +{ + return ERR_PTR(-ENODEV); +} + static inline void devm_pwm_put(struct device *dev, struct pwm_device *pwm) { } |