This patch add APIs to control the extcon device on extcon provider driver. The extcon_dev_allocate() allocates the memory of extcon device and initializes supported cables. And then extcon_dev_free() decrement the reference of the device of extcon device and free the memory of the extcon device. This APIs must need to implement devm_extcon_dev_allocate()/free() APIs.
Signed-off-by: Chanwoo Choi <[email protected]> --- drivers/extcon/extcon-class.c | 39 +++++++++++++++++++++++++++++++++++++++ include/linux/extcon.h | 13 +++++++++++++ 2 files changed, 52 insertions(+) diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c index f6df689..bec66d4 100644 --- a/drivers/extcon/extcon-class.c +++ b/drivers/extcon/extcon-class.c @@ -565,6 +565,45 @@ 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) { + pr_err("Failed to allocate the memory for extcon device\n"); + 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) +{ + if (edev) + kfree(edev); +} +EXPORT_SYMBOL_GPL(extcon_dev_free); + /** * extcon_dev_register() - Register a new extcon device * @edev : the new extcon device (should be allocated before calling) diff --git a/include/linux/extcon.h b/include/linux/extcon.h index 548447b..f4fc983 100644 --- a/include/linux/extcon.h +++ b/include/linux/extcon.h @@ -192,6 +192,12 @@ extern void devm_extcon_dev_unregister(struct device *dev, extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name); /* + * Following APIs control the memory of extcon device. + */ +extern struct extcon_dev *extcon_dev_allocate(const char **cables); +extern void extcon_dev_free(struct extcon_dev *edev); + +/* * get/set/update_state access the 32b encoded state value, which represents * states of all possible cables of the multistate port. For example, if one * calls extcon_set_state(edev, 0x7), it may mean that all the three cables @@ -267,6 +273,13 @@ static inline int devm_extcon_dev_register(struct device *dev, static inline void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev) { } +static inline struct extcon_dev *extcon_dev_allocate(const char **cables) +{ + return ERR_PTR(-ENOMEM); +} + +static inline void extcon_dev_free(struct extcon_dev *edev) { } + static inline u32 extcon_get_state(struct extcon_dev *edev) { return 0; -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
