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usb: gadget: f_fs: add ioctl returning ep descriptor

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This patch introduces ioctl named FUNCTIONFS_ENDPOINT_DESC, which
returns endpoint descriptor to userspace. It works only if function
is active.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Robert Baldyga 2014-09-09 08:23:16 +02:00 committed by Felipe Balbi
parent e45cfa2051
commit c559a35341
2 changed files with 29 additions and 0 deletions
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23
drivers/usb/gadget/function/f_fs.c
View File

@ -1026,6 +1026,29 @@ static long ffs_epfile_ioctl(struct file *file, unsigned code,
case FUNCTIONFS_ENDPOINT_REVMAP:
ret = epfile->ep->num;
break;
case FUNCTIONFS_ENDPOINT_DESC:
{
int desc_idx;
struct usb_endpoint_descriptor *desc;
switch (epfile->ffs->gadget->speed) {
case USB_SPEED_SUPER:
desc_idx = 2;
break;
case USB_SPEED_HIGH:
desc_idx = 1;
break;
default:
desc_idx = 0;
}
desc = epfile->ep->descs[desc_idx];
spin_unlock_irq(&epfile->ffs->eps_lock);
ret = copy_to_user((void *)value, desc, sizeof(*desc));
if (ret)
ret = -EFAULT;
return ret;
}
default:
ret = -ENOTTY;
}

6
include/uapi/linux/usb/functionfs.h
View File

@ -275,6 +275,12 @@ struct usb_functionfs_event {
*/
#define FUNCTIONFS_ENDPOINT_REVMAP _IO('g', 129)
/*
* Returns endpoint descriptor. If function is not active returns -ENODEV.
*/
#define FUNCTIONFS_ENDPOINT_DESC _IOR('g', 130, \
struct usb_endpoint_descriptor)
#endif /* _UAPI__LINUX_FUNCTIONFS_H__ */