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usb: gadget: udc-core: introduce usb_add_gadget_udc_release()

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not all UDC drivers need a proper release function,
for those which don't need it, we udc-core will provide
a no-op release method so we can remove "redefinition"
of such methods in almost every UDC driver.

Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi 2013-02-26 14:47:44 +02:00
parent 8707d5abbd
commit 792bfcf7a1
2 changed files with 36 additions and 5 deletions
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39
drivers/usb/gadget/udc-core.c
View file

@ -166,15 +166,23 @@ static void usb_udc_release(struct device *dev)
}
static const struct attribute_group *usb_udc_attr_groups[];
static void usb_udc_nop_release(struct device *dev)
{
dev_vdbg(dev, "%s\n", __func__);
}
/**
* usb_add_gadget_udc - adds a new gadget to the udc class driver list
* @parent: the parent device to this udc. Usually the controller
* driver's device.
* @gadget: the gadget to be added to the list
* usb_add_gadget_udc_release - adds a new gadget to the udc class driver list
* @parent: the parent device to this udc. Usually the controller driver's
* device.
* @gadget: the gadget to be added to the list.
* @release: a gadget release function.
*
* Returns zero on success, negative errno otherwise.
*/
int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget,
void (*release)(struct device *dev))
{
struct usb_udc *udc;
int ret = -ENOMEM;
@ -190,6 +198,13 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
gadget->dev.dma_parms = parent->dma_parms;
gadget->dev.dma_mask = parent->dma_mask;
if (release) {
gadget->dev.release = release;
} else {
if (!gadget->dev.release)
gadget->dev.release = usb_udc_nop_release;
}
ret = device_register(&gadget->dev);
if (ret)
goto err2;
@ -231,6 +246,20 @@ err2:
err1:
return ret;
}
EXPORT_SYMBOL_GPL(usb_add_gadget_udc_release);
/**
* usb_add_gadget_udc - adds a new gadget to the udc class driver list
* @parent: the parent device to this udc. Usually the controller
* driver's device.
* @gadget: the gadget to be added to the list
*
* Returns zero on success, negative errno otherwise.
*/
int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
{
return usb_add_gadget_udc_release(parent, gadget, NULL);
}
EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
static void usb_gadget_remove_driver(struct usb_udc *udc)

2
include/linux/usb/gadget.h
View file

@ -874,6 +874,8 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver);
*/
int usb_gadget_unregister_driver(struct usb_gadget_driver *driver);
extern int usb_add_gadget_udc_release(struct device *parent,
struct usb_gadget *gadget, void (*release)(struct device *dev));
extern int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget);
extern void usb_del_gadget_udc(struct usb_gadget *gadget);
extern int udc_attach_driver(const char *name,