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usb: gadget: uvc: configfs: Add bFormatIndex attributes 

The UVC format description are numbered using the descriptor's
bFormatIndex field. The index is used in UVC requests, and is thus
needed to handle requests in userspace. Make it dynamically discoverable
by exposing it in a bFormatIndex configfs attribute of the uncompressed
and mjpeg format config items.

The bFormatIndex value exposed through the attribute is stored in the
config item private data. However, that value is never set: the driver
instead computes the bFormatIndex value when linking the stream class
header in the configfs hierarchy and stores it directly in the class
descriptors in a separate structure. In order to expose the value
through the configfs attribute, store it in the config item private data
as well. This results in a small code simplification.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Laurent Pinchart 2018-05-27 00:51:57 +03:00
parent bf71544883
commit 61ff10e0ea
2 changed files with 16 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Documentation/ABI/testing/configfs-usb-gadget-uvc
View File

@ -168,6 +168,10 @@ Description: Specific MJPEG format descriptors
All attributes read only,
except bmaControls and bDefaultFrameIndex:
bFormatIndex - unique id for this format descriptor;
only defined after parent header is
linked into the streaming class;
read-only
bmaControls - this format's data for bmaControls in
the streaming header
bmInterfaceFlags - specifies interlace information,
@ -212,6 +216,10 @@ Date: Dec 2014
KernelVersion: 4.0
Description: Specific uncompressed format descriptors
bFormatIndex - unique id for this format descriptor;
only defined after parent header is
linked into the streaming class;
read-only
bmaControls - this format's data for bmaControls in
the streaming header
bmInterfaceFlags - specifies interlace information,

14
drivers/usb/gadget/function/uvc_configfs.c
View File

@ -1538,6 +1538,7 @@ UVC_ATTR(uvcg_uncompressed_, cname, aname);
#define identity_conv(x) (x)
UVCG_UNCOMPRESSED_ATTR_RO(b_format_index, bFormatIndex, identity_conv);
UVCG_UNCOMPRESSED_ATTR(b_bits_per_pixel, bBitsPerPixel, identity_conv);
UVCG_UNCOMPRESSED_ATTR(b_default_frame_index, bDefaultFrameIndex,
identity_conv);
@ -1568,6 +1569,7 @@ uvcg_uncompressed_bma_controls_store(struct config_item *item,
UVC_ATTR(uvcg_uncompressed_, bma_controls, bmaControls);
static struct configfs_attribute *uvcg_uncompressed_attrs[] = {
&uvcg_uncompressed_attr_b_format_index,
&uvcg_uncompressed_attr_guid_format,
&uvcg_uncompressed_attr_b_bits_per_pixel,
&uvcg_uncompressed_attr_b_default_frame_index,
@ -1738,6 +1740,7 @@ UVC_ATTR(uvcg_mjpeg_, cname, aname)
#define identity_conv(x) (x)
UVCG_MJPEG_ATTR_RO(b_format_index, bFormatIndex, identity_conv);
UVCG_MJPEG_ATTR(b_default_frame_index, bDefaultFrameIndex,
identity_conv);
UVCG_MJPEG_ATTR_RO(bm_flags, bmFlags, identity_conv);
@ -1768,6 +1771,7 @@ uvcg_mjpeg_bma_controls_store(struct config_item *item,
UVC_ATTR(uvcg_mjpeg_, bma_controls, bmaControls);
static struct configfs_attribute *uvcg_mjpeg_attrs[] = {
&uvcg_mjpeg_attr_b_format_index,
&uvcg_mjpeg_attr_b_default_frame_index,
&uvcg_mjpeg_attr_bm_flags,
&uvcg_mjpeg_attr_b_aspect_ratio_x,
@ -2079,24 +2083,22 @@ static int __uvcg_fill_strm(void *priv1, void *priv2, void *priv3, int n,
struct uvcg_format *fmt = priv1;
if (fmt->type == UVCG_UNCOMPRESSED) {
struct uvc_format_uncompressed *unc = *dest;
struct uvcg_uncompressed *u =
container_of(fmt, struct uvcg_uncompressed,
fmt);
u->desc.bFormatIndex = n + 1;
u->desc.bNumFrameDescriptors = fmt->num_frames;
memcpy(*dest, &u->desc, sizeof(u->desc));
*dest += sizeof(u->desc);
unc->bNumFrameDescriptors = fmt->num_frames;
unc->bFormatIndex = n + 1;
} else if (fmt->type == UVCG_MJPEG) {
struct uvc_format_mjpeg *mjp = *dest;
struct uvcg_mjpeg *m =
container_of(fmt, struct uvcg_mjpeg, fmt);
m->desc.bFormatIndex = n + 1;
m->desc.bNumFrameDescriptors = fmt->num_frames;
memcpy(*dest, &m->desc, sizeof(m->desc));
*dest += sizeof(m->desc);
mjp->bNumFrameDescriptors = fmt->num_frames;
mjp->bFormatIndex = n + 1;
} else {
return -EINVAL;
}