diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/core.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 85592e97ef2d..92b1782d0d8e 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -646,6 +646,64 @@ out: } EXPORT_SYMBOL_GPL(pwm_put); +static void devm_pwm_release(struct device *dev, void *res) +{ + pwm_put(*(struct pwm_device **)res); +} + +/** + * devm_pwm_get() - resource managed pwm_get() + * @dev: device for PWM consumer + * @con_id: consumer name + * + * This function performs like pwm_get() but the acquired PWM device will + * automatically be released on driver detach. + */ +struct pwm_device *devm_pwm_get(struct device *dev, 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 = pwm_get(dev, con_id); + if (!IS_ERR(pwm)) { + *ptr = pwm; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return pwm; +} +EXPORT_SYMBOL_GPL(devm_pwm_get); + +static int devm_pwm_match(struct device *dev, void *res, void *data) +{ + struct pwm_device **p = res; + + if (WARN_ON(!p || !*p)) + return 0; + + return *p == data; +} + +/** + * devm_pwm_put() - resource managed pwm_put() + * @dev: device for PWM consumer + * @pwm: PWM device + * + * Release a PWM previously allocated using devm_pwm_get(). Calling this + * function is usually not needed because devm-allocated resources are + * automatically released on driver detach. + */ +void devm_pwm_put(struct device *dev, struct pwm_device *pwm) +{ + WARN_ON(devres_release(dev, devm_pwm_release, devm_pwm_match, pwm)); +} +EXPORT_SYMBOL_GPL(devm_pwm_put); + #ifdef CONFIG_DEBUG_FS static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s) { |