diff options
Diffstat (limited to 'drivers/extcon/extcon-class.c')
| -rw-r--r-- | drivers/extcon/extcon-class.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c index 7ab21aa6eaa..18d42c0e458 100644 --- a/drivers/extcon/extcon-class.c +++ b/drivers/extcon/extcon-class.c @@ -565,6 +565,100 @@ static void dummy_sysfs_dev_release(struct device *dev) { } +/* + * extcon_dev_allocate() - Allocate the memory of extcon device. + * @supported_cable: Array of supported cable names ending with NULL. + * If supported_cable is NULL, cable name related APIs + * are disabled. + * + * This function allocates the memory for extcon device without allocating + * memory in each extcon provider driver and initialize default setting for + * extcon device. + * + * Return the pointer of extcon device if success or ERR_PTR(err) if fail + */ +struct extcon_dev *extcon_dev_allocate(const char **supported_cable) +{ + struct extcon_dev *edev; + + edev = kzalloc(sizeof(*edev), GFP_KERNEL); + if (!edev) + return ERR_PTR(-ENOMEM); + + edev->max_supported = 0; + edev->supported_cable = supported_cable; + + return edev; +} + +/* + * extcon_dev_free() - Free the memory of extcon device. + * @edev: the extcon device to free + */ +void extcon_dev_free(struct extcon_dev *edev) +{ + kfree(edev); +} +EXPORT_SYMBOL_GPL(extcon_dev_free); + +static int devm_extcon_dev_match(struct device *dev, void *res, void *data) +{ + struct extcon_dev **r = res; + + if (WARN_ON(!r || !*r)) + return 0; + + return *r == data; +} + +static void devm_extcon_dev_release(struct device *dev, void *res) +{ + extcon_dev_free(*(struct extcon_dev **)res); +} + +/** + * devm_extcon_dev_allocate - Allocate managed extcon device + * @dev: device owning the extcon device being created + * @supported_cable: Array of supported cable names ending with NULL. + * If supported_cable is NULL, cable name related APIs + * are disabled. + * + * This function manages automatically the memory of extcon device using device + * resource management and simplify the control of freeing the memory of extcon + * device. + * + * Returns the pointer memory of allocated extcon_dev if success + * or ERR_PTR(err) if fail + */ +struct extcon_dev *devm_extcon_dev_allocate(struct device *dev, + const char **supported_cable) +{ + struct extcon_dev **ptr, *edev; + + ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + edev = extcon_dev_allocate(supported_cable); + if (IS_ERR(edev)) { + devres_free(ptr); + return edev; + } + + *ptr = edev; + devres_add(dev, ptr); + + return edev; +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate); + +void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev) +{ + WARN_ON(devres_release(dev, devm_extcon_dev_release, + devm_extcon_dev_match, edev)); +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_free); + /** * extcon_dev_register() - Register a new extcon device * @edev : the new extcon device (should be allocated before calling) @@ -819,6 +913,63 @@ void extcon_dev_unregister(struct extcon_dev *edev) } EXPORT_SYMBOL_GPL(extcon_dev_unregister); +static void devm_extcon_dev_unreg(struct device *dev, void *res) +{ + extcon_dev_unregister(*(struct extcon_dev **)res); +} + +/** + * devm_extcon_dev_register() - Resource-managed extcon_dev_register() + * @dev: device to allocate extcon device + * @edev: the new extcon device to register + * + * Managed extcon_dev_register() function. If extcon device is attached with + * this function, that extcon device is automatically unregistered on driver + * detach. Internally this function calls extcon_dev_register() function. + * To get more information, refer that function. + * + * If extcon device is registered with this function and the device needs to be + * unregistered separately, devm_extcon_dev_unregister() should be used. + * + * Returns 0 if success or negaive error number if failure. + */ +int devm_extcon_dev_register(struct device *dev, struct extcon_dev *edev) +{ + struct extcon_dev **ptr; + int ret; + + ptr = devres_alloc(devm_extcon_dev_unreg, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + ret = extcon_dev_register(edev); + if (ret) { + devres_free(ptr); + return ret; + } + + *ptr = edev; + devres_add(dev, ptr); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_register); + +/** + * devm_extcon_dev_unregister() - Resource-managed extcon_dev_unregister() + * @dev: device the extcon belongs to + * @edev: the extcon device to unregister + * + * Unregister extcon device that is registered with devm_extcon_dev_register() + * function. + */ +void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) +{ + WARN_ON(devres_release(dev, devm_extcon_dev_unreg, + devm_extcon_dev_match, edev)); +} +EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister); + #ifdef CONFIG_OF /* * extcon_get_edev_by_phandle - Get the extcon device from devicetree |