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pinctrl: Add devm_ apis for pinctrl_{register, unregister}

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Add device managed APIs devm_pinctrl_register() and
devm_pinctrl_unregister() for the APIs pinctrl_register()
and pinctrl_unregister().

This helps in reducing code in error path and sometimes
removal of .remove callback for driver unbind.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Laxman Dewangan 2016-02-24 14:12:59 +05:30 committed by Linus Walleij
parent 1417b35e29
commit 80e0f8d94d
2 changed files with 69 additions and 0 deletions
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63
drivers/pinctrl/core.c
View File

@ -1872,6 +1872,69 @@ void pinctrl_unregister(struct pinctrl_dev *pctldev)
}
EXPORT_SYMBOL_GPL(pinctrl_unregister);
static void devm_pinctrl_dev_release(struct device *dev, void *res)
{
struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res;
pinctrl_unregister(pctldev);
}
static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data)
{
struct pctldev **r = res;
if (WARN_ON(!r || !*r)
return 0;
return *r == data;
}
/**
* devm_pinctrl_register() - Resource managed version of pinctrl_register().
* @dev: parent device for this pin controller
* @pctldesc: descriptor for this pin controller
* @driver_data: private pin controller data for this pin controller
*
* Returns an error pointer if pincontrol register failed. Otherwise
* it returns valid pinctrl handle.
*
* The pinctrl device will be automatically released when the device is unbound.
*/
struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
struct pinctrl_desc *pctldesc,
void *driver_data)
{
struct pinctrl_dev **ptr, *pctldev;
ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
pctldev = pinctrl_register(pctldesc, dev, driver_data);
if (IS_ERR(pctldev)) {
devres_free(ptr);
return pctldev;
}
*ptr = pctldev;
devres_add(dev, ptr);
return pctldev;
}
EXPORT_SYMBOL_GPL(devm_pinctrl_register);
/**
* devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
* @dev: device for which which resource was allocated
* @pctldev: the pinctrl device to unregister.
*/
void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev)
{
WARN_ON(devres_release(dev, devm_pinctrl_dev_release,
devm_pinctrl_dev_match, pctldev));
}
EXPORT_SYMBOL_GPL(devm_pinctrl_unregister);
static int __init pinctrl_init(void)
{
pr_info("initialized pinctrl subsystem\n");

6
include/linux/pinctrl/pinctrl.h
View File

@ -144,6 +144,12 @@ struct pinctrl_desc {
extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
struct device *dev, void *driver_data);
extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
struct pinctrl_desc *pctldesc,
void *driver_data);
extern void devm_pinctrl_unregister(struct device *dev,
struct pinctrl_dev *pctldev);
extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range);