On Thu, Jul 11, 2024 at 01:53:04PM +0530, Akash Kumar wrote:
> Add support for framebased frame format which can be used to support
> multiple formats like H264 or H265 other than mjpeg and YUV frames.
>
> Framebased format is set to H264 by default, which can be updated to
> other formats by updating the GUID through guid configfs attribute.
> Using Different structures for all 3 formats as H264 has different
> structure than mjpeg and uncompressed which will be paased to
> frame make func based on active format instead of common frame
> structure, have updated all apis in driver accordingly.
> h264 is not recognized by hosts machine during enumeration
> with common frame structure, so we need to pass h264 frame
> structure separately.
>
> Signed-off-by: Akash Kumar <quic_akakum@xxxxxxxxxxx>
> ---
> .../ABI/testing/configfs-usb-gadget-uvc | 88 ++-
> drivers/usb/gadget/function/uvc_configfs.c | 570 +++++++++++++++---
> drivers/usb/gadget/function/uvc_configfs.h | 34 +-
> drivers/usb/gadget/function/uvc_v4l2.c | 80 ++-
> include/uapi/linux/usb/video.h | 62 ++
> 5 files changed, 714 insertions(+), 120 deletions(-)
>
> Changes for v2:
> - Added H264 frame format Details in Documentation/ABI/
> and new configsfs attribute path for mjpeg and
> uncompresseed formats.
>
> diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc b/Documentation/ABI/testing/configfs-usb-gadget-uvc
> index 4feb692c4c1d..2580083cdcc5 100644
> --- a/Documentation/ABI/testing/configfs-usb-gadget-uvc
> +++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc
> @@ -224,13 +224,13 @@ Description: Additional color matching descriptors
> white
> ======================== ======================================
>
> -What: /config/usb-gadget/gadget/functions/uvc.name/streaming/mjpeg
> -Date: Dec 2014
> +What: /config/usb-gadget/gadget/functions/uvc.name/streaming/mjpeg/name
You are changing an existing api, how will all existing code handle
this? Will it not break? What is ensuring that this will work as-is
ok?
> -#define UVCG_FRAME_ATTR(cname, aname, bits) \
> -static ssize_t uvcg_frame_##cname##_show(struct config_item *item, char *page)\
> +#define UVCG_FRAME_ATTR(cname, fname, bits) \
> +static ssize_t uvcg_frame_##fname##_##cname##_show(struct config_item *item, char *page)\
> { \
> struct uvcg_frame *f = to_uvcg_frame(item); \
> struct f_uvc_opts *opts; \
> @@ -1936,14 +1941,14 @@ static ssize_t uvcg_frame_##cname##_show(struct config_item *item, char *page)\
> opts = to_f_uvc_opts(opts_item); \
> \
> mutex_lock(&opts->lock); \
> - result = sprintf(page, "%u\n", f->frame.cname); \
> + result = scnprintf(page, PAGE_SIZE, "%u\n", f->frame.fname.cname);\
sysfs_emit() is made for this.
thanks,
greg k-h
