Commit 1d0c48e6 authored by Jingoo Han's avatar Jingoo Han Committed by Linus Torvalds
Browse files

lcd: add devm_lcd_device_{register,unregister}()

These functions allow the driver core to automatically clean up any
allocation made by lcd drivers.  Thus it simplifies the error paths.
Signed-off-by: default avatarJingoo Han <>
Cc: Tejun Heo <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 8318fde4
......@@ -260,6 +260,76 @@ void lcd_device_unregister(struct lcd_device *ld)
static void devm_lcd_device_release(struct device *dev, void *res)
struct lcd_device *lcd = *(struct lcd_device **)res;
static int devm_lcd_device_match(struct device *dev, void *res, void *data)
struct lcd_device **r = res;
return *r == data;
* devm_lcd_device_register - resource managed lcd_device_register()
* @dev: the device to register
* @name: the name of the device
* @parent: a pointer to the parent device
* @devdata: an optional pointer to be stored for private driver use
* @ops: the lcd operations structure
* @return a struct lcd on success, or an ERR_PTR on error
* Managed lcd_device_register(). The lcd_device returned from this function
* are automatically freed on driver detach. See lcd_device_register()
* for more information.
struct lcd_device *devm_lcd_device_register(struct device *dev,
const char *name, struct device *parent,
void *devdata, struct lcd_ops *ops)
struct lcd_device **ptr, *lcd;
ptr = devres_alloc(devm_lcd_device_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
lcd = lcd_device_register(name, parent, devdata, ops);
if (!IS_ERR(lcd)) {
*ptr = lcd;
devres_add(dev, ptr);
} else {
return lcd;
* devm_lcd_device_unregister - resource managed lcd_device_unregister()
* @dev: the device to unregister
* @ld: the lcd device to unregister
* Deallocated a lcd allocated with devm_lcd_device_register(). Normally
* this function will not need to be called and the resource management
* code will ensure that the resource is freed.
void devm_lcd_device_unregister(struct device *dev, struct lcd_device *ld)
int rc;
rc = devres_release(dev, devm_lcd_device_release,
devm_lcd_device_match, ld);
static void __exit lcd_class_exit(void)
......@@ -112,7 +112,12 @@ static inline void lcd_set_power(struct lcd_device *ld, int power)
extern struct lcd_device *lcd_device_register(const char *name,
struct device *parent, void *devdata, struct lcd_ops *ops);
extern struct lcd_device *devm_lcd_device_register(struct device *dev,
const char *name, struct device *parent,
void *devdata, struct lcd_ops *ops);
extern void lcd_device_unregister(struct lcd_device *ld);
extern void devm_lcd_device_unregister(struct device *dev,
struct lcd_device *ld);
#define to_lcd_device(obj) container_of(obj, struct lcd_device, dev)
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