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usb: gadget: uvc: Expose configuration name through video node

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When utilising multiple instantiations of a UVC gadget on a composite
device, there is no clear method to link a particular configuration to
its respective video node.

Provide a means for identifying the correct video node by exposing the
name of the function configuration through sysfs.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Kieran Bingham 2018-05-24 17:16:12 +01:00 committed by Felipe Balbi
parent c728effd56
commit d7af78b924
2 changed files with 28 additions and 1 deletions
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5
Documentation/ABI/testing/configfs-usb-gadget-uvc
View File

@ -263,3 +263,8 @@ Description: Specific streaming header descriptors
is connected
bmInfo - capabilities of this video streaming
interface
What: /sys/class/udc/udc.name/device/gadget/video4linux/video.name/function_name
Date: May 2018
KernelVersion: 4.19
Description: UVC configfs function instance name

24
drivers/usb/gadget/function/f_uvc.c
View File

@ -413,10 +413,21 @@ uvc_function_disconnect(struct uvc_device *uvc)
* USB probe and disconnect
*/
static ssize_t function_name_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct uvc_device *uvc = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", uvc->func.fi->group.cg_item.ci_name);
}
static DEVICE_ATTR_RO(function_name);
static int
uvc_register_video(struct uvc_device *uvc)
{
struct usb_composite_dev *cdev = uvc->func.config->cdev;
int ret;
/* TODO reference counting. */
uvc->vdev.v4l2_dev = &uvc->v4l2_dev;
@ -429,7 +440,17 @@ uvc_register_video(struct uvc_device *uvc)
video_set_drvdata(&uvc->vdev, uvc);
return video_register_device(&uvc->vdev, VFL_TYPE_GRABBER, -1);
ret = video_register_device(&uvc->vdev, VFL_TYPE_GRABBER, -1);
if (ret < 0)
return ret;
ret = device_create_file(&uvc->vdev.dev, &dev_attr_function_name);
if (ret < 0) {
video_unregister_device(&uvc->vdev);
return ret;
}
return 0;
}
#define UVC_COPY_DESCRIPTOR(mem, dst, desc) \
@ -867,6 +888,7 @@ static void uvc_unbind(struct usb_configuration *c, struct usb_function *f)
INFO(cdev, "%s\n", __func__);
device_remove_file(&uvc->vdev.dev, &dev_attr_function_name);
video_unregister_device(&uvc->vdev);
v4l2_device_unregister(&uvc->v4l2_dev);