diff options
Diffstat (limited to 'drivers/pwm/core.c')
| -rw-r--r-- | drivers/pwm/core.c | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index ba34c7d89042..3a7769fe53de 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -223,13 +223,16 @@ void *pwm_get_chip_data(struct pwm_device *pwm) EXPORT_SYMBOL_GPL(pwm_get_chip_data); /** - * pwmchip_add() - register a new PWM chip + * pwmchip_add_with_polarity() - register a new PWM chip * @chip: the PWM chip to add + * @polarity: initial polarity of PWM channels * * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base - * will be used. + * will be used. The initial polarity for all channels is specified by the + * @polarity parameter. */ -int pwmchip_add(struct pwm_chip *chip) +int pwmchip_add_with_polarity(struct pwm_chip *chip, + enum pwm_polarity polarity) { struct pwm_device *pwm; unsigned int i; @@ -259,6 +262,7 @@ int pwmchip_add(struct pwm_chip *chip) pwm->chip = chip; pwm->pwm = chip->base + i; pwm->hwpwm = i; + pwm->polarity = polarity; radix_tree_insert(&pwm_tree, pwm->pwm, pwm); } @@ -279,6 +283,19 @@ out: mutex_unlock(&pwm_lock); return ret; } +EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity); + +/** + * pwmchip_add() - register a new PWM chip + * @chip: the PWM chip to add + * + * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base + * will be used. The initial polarity for all channels is normal. + */ +int pwmchip_add(struct pwm_chip *chip) +{ + return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL); +} EXPORT_SYMBOL_GPL(pwmchip_add); /** @@ -586,6 +603,23 @@ void pwm_add_table(struct pwm_lookup *table, size_t num) } /** + * pwm_remove_table() - unregister PWM device consumers + * @table: array of consumers to unregister + * @num: number of consumers in table + */ +void pwm_remove_table(struct pwm_lookup *table, size_t num) +{ + mutex_lock(&pwm_lookup_lock); + + while (num--) { + list_del(&table->list); + table++; + } + + mutex_unlock(&pwm_lookup_lock); +} + +/** * pwm_get() - look up and request a PWM device * @dev: device for PWM consumer * @con_id: consumer name |