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USB: UDC: Expand device model API interface

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The routines used by the UDC core to interface with the kernel's
device model, namely usb_add_gadget_udc(),
usb_add_gadget_udc_release(), and usb_del_gadget_udc(), provide access
to only a subset of the device model's full API.  They include
functionality equivalent to device_register() and device_unregister()
for gadgets, but they omit device_initialize(), device_add(),
device_del(), get_device(), and put_device().

This patch expands the UDC API by adding usb_initialize_gadget(),
usb_add_gadget(), usb_del_gadget(), usb_get_gadget(), and
usb_put_gadget() to fill in the gap.  It rewrites the existing
routines to call the new ones.

CC: Anton Vasilyev <vasilyev@ispras.ru>
CC: Evgeny Novikov <novikov@ispras.ru>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Alan Stern
2020-08-21 10:55:44 +08:00
committed by Felipe Balbi
parent 8dafb3c04d
commit 3301c215a2
2 changed files with 84 additions and 21 deletions
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27
include/linux/usb/gadget.h
View File

@@ -436,6 +436,7 @@ struct usb_gadget {
};
#define work_to_gadget(w) (container_of((w), struct usb_gadget, work))
/* Interface to the device model */
static inline void set_gadget_data(struct usb_gadget *gadget, void *data)
{ dev_set_drvdata(&gadget->dev, data); }
static inline void *get_gadget_data(struct usb_gadget *gadget)
@@ -444,6 +445,26 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
{
return container_of(dev, struct usb_gadget, dev);
}
static inline struct usb_gadget *usb_get_gadget(struct usb_gadget *gadget)
{
get_device(&gadget->dev);
return gadget;
}
static inline void usb_put_gadget(struct usb_gadget *gadget)
{
put_device(&gadget->dev);
}
extern void usb_initialize_gadget(struct device *parent,
struct usb_gadget *gadget, void (*release)(struct device *dev));
extern int usb_add_gadget(struct usb_gadget *gadget);
extern void usb_del_gadget(struct usb_gadget *gadget);
/* Legacy device-model interface */
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 char *usb_get_gadget_udc_name(void);
/* iterates the non-control endpoints; 'tmp' is a struct usb_ep pointer */
#define gadget_for_each_ep(tmp, gadget) \
@@ -735,12 +756,6 @@ 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 char *usb_get_gadget_udc_name(void);
/*-------------------------------------------------------------------------*/
/* utility to simplify dealing with string descriptors */