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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2018-05-26 23:51:57 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2018-09-24 17:54:32 +0200
commit61ff10e0ea0cb39c737eab7e4fc5f0ae4d0fff33 (patch)
tree8e223ae0ac15fa3eaddddb4ca32a63b861ae7a64 /drivers
parentusb: gadget: uvc: configfs: Add interface number attributes (diff)
downloadlinux-61ff10e0ea0cb39c737eab7e4fc5f0ae4d0fff33.tar.xz
linux-61ff10e0ea0cb39c737eab7e4fc5f0ae4d0fff33.zip
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/gadget/function/uvc_configfs.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index fa8d2e1f54ba..5cee8aca3734 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -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;
}