* usb: gadget: uvc: Utilise instance name in video name
@ 2018-05-22 19:05 Laurent Pinchart
0 siblings, 0 replies; 2+ messages in thread
From: Laurent Pinchart @ 2018-05-22 19:05 UTC (permalink / raw)
To: Kieran Bingham; +Cc: Paul Elder, linux-usb, balbi, Kieran Bingham
Hi Kieran,
Thank you for the patch.
On Tuesday, 22 May 2018 18:29:49 EEST Kieran Bingham wrote:
> From: Kieran Bingham <kieran.bingham@ideasonboard.com>
>
> With multiple UVC gadgets on a composite device, the device names become
> indistinguishable from one another.
>
> Extend the gadget video name to incorporate the function instance name,
> along side the existing UDC controller name.
>
> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
> ---
> drivers/usb/gadget/function/f_uvc.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/function/f_uvc.c
> b/drivers/usb/gadget/function/f_uvc.c index 1affa8e3a974..65454a31ad68
> 100644
> --- a/drivers/usb/gadget/function/f_uvc.c
> +++ b/drivers/usb/gadget/function/f_uvc.c
> @@ -433,7 +433,9 @@ uvc_register_video(struct uvc_device *uvc)
> uvc->vdev.release = video_device_release_empty;
> uvc->vdev.vfl_dir = VFL_DIR_TX;
> uvc->vdev.lock = &uvc->video.mutex;
> - strlcpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name));
> +
> + snprintf(uvc->vdev.name, sizeof(uvc->vdev.name), "%s:%s",
> + cdev->gadget->name, uvc->func.fi->group.cg_item.ci_name);
If the function is instantiated from the legacy g_webcam, the whole group
structure will be zero, so ci_name will be empty. I think you should omit the
":" in that case.
I also wonder whether the vdev.name field will always be long enough. If we
can't guarantee that, would it make sense to instead expose the config item
name through a custom sysfs property for the video device ?
> video_set_drvdata(&uvc->vdev, uvc);
^ permalink raw reply [flat|nested] 2+ messages in thread
* usb: gadget: uvc: Utilise instance name in video name
@ 2018-05-22 15:29 Kieran Bingham
0 siblings, 0 replies; 2+ messages in thread
From: Kieran Bingham @ 2018-05-22 15:29 UTC (permalink / raw)
To: Laurent Pinchart, Paul Elder; +Cc: linux-usb, balbi, Kieran Bingham
From: Kieran Bingham <kieran.bingham@ideasonboard.com>
With multiple UVC gadgets on a composite device, the device names become
indistinguishable from one another.
Extend the gadget video name to incorporate the function instance name,
along side the existing UDC controller name.
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
drivers/usb/gadget/function/f_uvc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 1affa8e3a974..65454a31ad68 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -433,7 +433,9 @@ uvc_register_video(struct uvc_device *uvc)
uvc->vdev.release = video_device_release_empty;
uvc->vdev.vfl_dir = VFL_DIR_TX;
uvc->vdev.lock = &uvc->video.mutex;
- strlcpy(uvc->vdev.name, cdev->gadget->name, sizeof(uvc->vdev.name));
+
+ snprintf(uvc->vdev.name, sizeof(uvc->vdev.name), "%s:%s",
+ cdev->gadget->name, uvc->func.fi->group.cg_item.ci_name);
video_set_drvdata(&uvc->vdev, uvc);
^ permalink raw reply related [flat|nested] 2+ messages in thread
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