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usb: gadget: udc-core: add "new-style" registration interface

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udc_start() should only trigger the internal state machine and make
minimal house keeping. Before that call udc-core calls the bind()
callback and after the callback the pullup().

udc_stop() is simillar, udc-core calls pullup(), unbind() and finally
udc_stop().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sebastian Andrzej Siewior 2011-06-23 14:26:15 +02:00 committed by Greg Kroah-Hartman
parent b5738413c9
commit 352c2dc8b0
2 changed files with 77 additions and 4 deletions
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75
drivers/usb/gadget/udc-core.c
View File

@ -72,6 +72,26 @@ static inline int usb_gadget_start(struct usb_gadget *gadget,
return gadget->ops->start(driver, bind);
}
/**
* usb_gadget_udc_start - tells usb device controller to start up
* @gadget: The gadget we want to get started
* @driver: The driver we want to bind to @gadget
*
* This call is issued by the UDC Class driver when it's about
* to register a gadget driver to the device controller, before
* calling gadget driver's bind() method.
*
* It allows the controller to be powered off until strictly
* necessary to have it powered on.
*
* Returns zero on success, else negative errno.
*/
static inline int usb_gadget_udc_start(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
return gadget->ops->udc_start(gadget, driver);
}
/**
* usb_gadget_stop - tells usb device controller we don't need it anymore
* @gadget: The device we want to stop activity
@ -90,6 +110,24 @@ static inline void usb_gadget_stop(struct usb_gadget *gadget,
gadget->ops->stop(driver);
}
/**
* usb_gadget_udc_stop - tells usb device controller we don't need it anymore
* @gadget: The device we want to stop activity
* @driver: The driver to unbind from @gadget
*
* This call is issued by the UDC Class driver after calling
* gadget driver's unbind() method.
*
* The details are implementation specific, but it can go as
* far as powering off UDC completely and disable its data
* line pullups.
*/
static inline void usb_gadget_udc_stop(struct usb_gadget *gadget,
struct usb_gadget_driver *driver)
{
gadget->ops->udc_stop(gadget, driver);
}
/**
* usb_udc_release - release the usb_udc struct
* @dev: the dev member within usb_udc
@ -155,6 +193,14 @@ int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
}
EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
static int udc_is_newstyle(struct usb_udc *udc)
{
if (udc->gadget->ops->udc_start && udc->gadget->ops->udc_stop)
return 1;
return 0;
}
static void usb_gadget_remove_driver(struct usb_udc *udc)
{
dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
@ -162,7 +208,14 @@ static void usb_gadget_remove_driver(struct usb_udc *udc)
kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
usb_gadget_stop(udc->gadget, udc->driver);
if (udc_is_newstyle(udc)) {
usb_gadget_disconnect(udc->gadget);
udc->driver->unbind(udc->gadget);
usb_gadget_udc_stop(udc->gadget, udc->driver);
} else {
usb_gadget_stop(udc->gadget, udc->driver);
}
udc->driver = NULL;
udc->dev.driver = NULL;
@ -232,9 +285,23 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
udc->driver = driver;
udc->dev.driver = &driver->driver;
ret = usb_gadget_start(udc->gadget, driver, bind);
if (ret)
goto err1;
if (udc_is_newstyle(udc)) {
ret = bind(udc->gadget);
if (ret)
goto err1;
ret = usb_gadget_udc_start(udc->gadget, driver);
if (ret) {
driver->unbind(udc->gadget);
goto err1;
}
usb_gadget_connect(udc->gadget);
} else {
ret = usb_gadget_start(udc->gadget, driver, bind);
if (ret)
goto err1;
}
kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
mutex_unlock(&udc_lock);

6
include/linux/usb/gadget.h
View File

@ -459,6 +459,12 @@ struct usb_gadget_ops {
int (*ioctl)(struct usb_gadget *,
unsigned code, unsigned long param);
void (*get_config_params)(struct usb_dcd_config_params *);
int (*udc_start)(struct usb_gadget *,
struct usb_gadget_driver *);
int (*udc_stop)(struct usb_gadget *,
struct usb_gadget_driver *);
/* Those two are deprecated */
int (*start)(struct usb_gadget_driver *,
int (*bind)(struct usb_gadget *));
int (*stop)(struct usb_gadget_driver *);