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USB: expand autosuspend/autoresume API 

This patch (as814) adds usb_autopm_set_interface() to the autosuspend
API.  It also provides convenient wrapper routines,
usb_autopm_enable() and usb_autopm_disable(), for drivers that want
to specify directly whether autosuspend should be allowed.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2006-10-30 17:07:51 -05:00 committed by Greg Kroah-Hartman
parent af4f76066d
commit 692a186c9d
2 changed files with 49 additions and 4 deletions
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22
drivers/usb/core/driver.c
View File

@ -1322,6 +1322,28 @@ int usb_autopm_get_interface(struct usb_interface *intf)
}
EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
/**
* usb_autopm_set_interface - set a USB interface's autosuspend state
* @intf: the usb_interface whose state should be set
*
* This routine sets the autosuspend state of @intf's device according
* to @intf's usage counter, which the caller must have set previously.
* If the counter is <= 0, the device is autosuspended (if it isn't
* already suspended and if nothing else prevents the autosuspend). If
* the counter is > 0, the device is autoresumed (if it isn't already
* awake).
*/
int usb_autopm_set_interface(struct usb_interface *intf)
{
int status;
status = usb_autopm_do_interface(intf, 0);
// dev_dbg(&intf->dev, "%s: status %d cnt %d\n",
// __FUNCTION__, status, intf->pm_usage_cnt);
return status;
}
EXPORT_SYMBOL_GPL(usb_autopm_set_interface);
#endif /* CONFIG_USB_SUSPEND */
static int usb_suspend(struct device *dev, pm_message_t message)

31
include/linux/usb.h
View File

@ -415,14 +415,37 @@ extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
/* USB autosuspend and autoresume */
#ifdef CONFIG_USB_SUSPEND
extern int usb_autopm_set_interface(struct usb_interface *intf);
extern int usb_autopm_get_interface(struct usb_interface *intf);
extern void usb_autopm_put_interface(struct usb_interface *intf);
#else
#define usb_autopm_get_interface(intf) 0
#define usb_autopm_put_interface(intf) do {} while (0)
#endif
static inline void usb_autopm_enable(struct usb_interface *intf)
{
intf->pm_usage_cnt = 0;
usb_autopm_set_interface(intf);
}
static inline void usb_autopm_disable(struct usb_interface *intf)
{
intf->pm_usage_cnt = 1;
usb_autopm_set_interface(intf);
}
#else
static inline int usb_autopm_set_interface(struct usb_interface *intf)
{ return 0; }
static inline int usb_autopm_get_interface(struct usb_interface *intf)
{ return 0; }
static inline void usb_autopm_put_interface(struct usb_interface *intf)
{ }
static inline void usb_autopm_enable(struct usb_interface *intf)
{ }
static inline void usb_autopm_disable(struct usb_interface *intf)
{ }
#endif
/*-------------------------------------------------------------------------*/