commit 588b9e85609b ("usb: gadget: uvc: add v4l2 enumeration api calls")
has rendered the precomposed (aka legacy) webcam gadget unloadable.
uvc_alloc() since then has depended on certain config groups being
available in configfs tree related to the UVC function. However, legacy
gadgets do not create anything in configfs, so uvc_alloc() must fail
with -ENOENT no matter what.
This patch mimics the required configfs hierarchy to satisfy the code which
inspects formats and frames found in uvcg_streaming_header.
This has been tested with guvcview on the host side, using vivid as a
source of video stream on the device side and using the userspace program
found at https://gitlab.freedesktop.org/camera/uvc-gadget.git.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx>
Fixes: 588b9e85609b ("usb: gadget: uvc: add v4l2 enumeration api calls")
---
drivers/usb/gadget/function/f_uvc.c | 45 +++---
drivers/usb/gadget/function/u_uvc.h | 6 +
drivers/usb/gadget/legacy/webcam.c | 232 ++++++++++++++++++++++------
3 files changed, 215 insertions(+), 68 deletions(-)
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 786379f1b7b7..3b46de85ca01 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -960,7 +960,8 @@ static void uvc_free(struct usb_function *f)
struct uvc_device *uvc = to_uvc(f);
struct f_uvc_opts *opts = container_of(f->fi, struct f_uvc_opts,
func_inst);
- config_item_put(&uvc->header->item);
+ if (!opts->header)
+ config_item_put(&uvc->header->item);
--opts->refcnt;
kfree(uvc);
}
@@ -1052,25 +1053,29 @@ static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
uvc->desc.hs_streaming = opts->hs_streaming;
uvc->desc.ss_streaming = opts->ss_streaming;
- streaming = config_group_find_item(&opts->func_inst.group, "streaming");
- if (!streaming)
- goto err_config;
-
- header = config_group_find_item(to_config_group(streaming), "header");
- config_item_put(streaming);
- if (!header)
- goto err_config;
-
- h = config_group_find_item(to_config_group(header), "h");
- config_item_put(header);
- if (!h)
- goto err_config;
-
- uvc->header = to_uvcg_streaming_header(h);
- if (!uvc->header->linked) {
- mutex_unlock(&opts->lock);
- kfree(uvc);
- return ERR_PTR(-EBUSY);
+ if (opts->header) {
+ uvc->header = opts->header;
+ } else {
+ streaming = config_group_find_item(&opts->func_inst.group, "streaming");
+ if (!streaming)
+ goto err_config;
+
+ header = config_group_find_item(to_config_group(streaming), "header");
+ config_item_put(streaming);
+ if (!header)
+ goto err_config;
+
+ h = config_group_find_item(to_config_group(header), "h");
+ config_item_put(header);
+ if (!h)
+ goto err_config;
+
+ uvc->header = to_uvcg_streaming_header(h);
+ if (!uvc->header->linked) {
+ mutex_unlock(&opts->lock);
+ kfree(uvc);
+ return ERR_PTR(-EBUSY);
+ }
}
uvc->desc.extension_units = &opts->extension_units;
diff --git a/drivers/usb/gadget/function/u_uvc.h b/drivers/usb/gadget/function/u_uvc.h
index 1ce58f61253c..3ac392cbb779 100644
--- a/drivers/usb/gadget/function/u_uvc.h
+++ b/drivers/usb/gadget/function/u_uvc.h
@@ -98,6 +98,12 @@ struct f_uvc_opts {
*/
struct mutex lock;
int refcnt;
+
+ /*
+ * Only for legacy gadget. Shall be NULL for configfs-composed gadgets,
+ * which is guaranteed by alloc_inst implementation of f_uvc doing kzalloc.
+ */
+ struct uvcg_streaming_header *header;
};
#endif /* U_UVC_H */
diff --git a/drivers/usb/gadget/legacy/webcam.c b/drivers/usb/gadget/legacy/webcam.c
index c06dd1af7a0c..6700c5e17055 100644
--- a/drivers/usb/gadget/legacy/webcam.c
+++ b/drivers/usb/gadget/legacy/webcam.c
@@ -12,6 +12,7 @@
#include <linux/usb/video.h>
#include "u_uvc.h"
+#include "uvc_configfs.h"
USB_GADGET_COMPOSITE_OPTIONS();
@@ -84,8 +85,6 @@ static struct usb_device_descriptor webcam_device_descriptor = {
.bNumConfigurations = 0, /* dynamic */
};
-DECLARE_UVC_HEADER_DESCRIPTOR(1);
-
static const struct UVC_HEADER_DESCRIPTOR(1) uvc_control_header = {
.bLength = UVC_DT_HEADER_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
@@ -158,21 +157,44 @@ static const struct UVC_INPUT_HEADER_DESCRIPTOR(1, 2) uvc_input_header = {
.bmaControls[1][0] = 4,
};
-static const struct uvc_format_uncompressed uvc_format_yuv = {
- .bLength = UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubType = UVC_VS_FORMAT_UNCOMPRESSED,
- .bFormatIndex = 1,
- .bNumFrameDescriptors = 2,
- .guidFormat =
- { 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00,
- 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71},
- .bBitsPerPixel = 16,
- .bDefaultFrameIndex = 1,
- .bAspectRatioX = 0,
- .bAspectRatioY = 0,
- .bmInterlaceFlags = 0,
- .bCopyProtect = 0,
+static const struct uvcg_color_matching uvcg_color_matching = {
+ .desc = {
+ .bLength = UVC_DT_COLOR_MATCHING_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = UVC_VS_COLORFORMAT,
+ .bColorPrimaries = 1,
+ .bTransferCharacteristics = 1,
+ .bMatrixCoefficients = 4,
+ },
+};
+
+static struct uvcg_uncompressed uvcg_format_yuv = {
+ .fmt = {
+ .type = UVCG_UNCOMPRESSED,
+ /* add to .frames and fill .num_frames at runtime */
+ .color_matching = (struct uvcg_color_matching *)&uvcg_color_matching,
+ },
+ .desc = {
+ .bLength = UVC_DT_FORMAT_UNCOMPRESSED_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = UVC_VS_FORMAT_UNCOMPRESSED,
+ .bFormatIndex = 1,
+ .bNumFrameDescriptors = 2,
+ .guidFormat = {
+ 'Y', 'U', 'Y', '2', 0x00, 0x00, 0x10, 0x00,
+ 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71
+ },
+ .bBitsPerPixel = 16,
+ .bDefaultFrameIndex = 1,
+ .bAspectRatioX = 0,
+ .bAspectRatioY = 0,
+ .bmInterlaceFlags = 0,
+ .bCopyProtect = 0,
+ },
+};
+
+static struct uvcg_format_ptr uvcg_format_ptr_yuv = {
+ .fmt = &uvcg_format_yuv.fmt,
};
DECLARE_UVC_FRAME_UNCOMPRESSED(1);
@@ -196,6 +218,29 @@ static const struct UVC_FRAME_UNCOMPRESSED(3) uvc_frame_yuv_360p = {
.dwFrameInterval[2] = cpu_to_le32(5000000),
};
+static const struct uvcg_frame uvcg_frame_yuv_360p = {
+ .fmt_type = UVCG_UNCOMPRESSED,
+ .frame = {
+ .b_length = uvc_frame_yuv_360p.bLength,
+ .b_descriptor_type = uvc_frame_yuv_360p.bDescriptorType,
+ .b_descriptor_subtype = uvc_frame_yuv_360p.bDescriptorSubType,
+ .b_frame_index = uvc_frame_yuv_360p.bFrameIndex,
+ .bm_capabilities = uvc_frame_yuv_360p.bmCapabilities,
+ .w_width = uvc_frame_yuv_360p.wWidth,
+ .w_height = uvc_frame_yuv_360p.wHeight,
+ .dw_min_bit_rate = uvc_frame_yuv_360p.dwMinBitRate,
+ .dw_max_bit_rate = uvc_frame_yuv_360p.dwMaxBitRate,
+ .dw_max_video_frame_buffer_size = uvc_frame_yuv_360p.dwMaxVideoFrameBufferSize,
+ .dw_default_frame_interval = uvc_frame_yuv_360p.dwDefaultFrameInterval,
+ .b_frame_interval_type = uvc_frame_yuv_360p.bFrameIntervalType,
+ },
+ .dw_frame_interval = (u32 *)uvc_frame_yuv_360p.dwFrameInterval,
+};
+
+static struct uvcg_frame_ptr uvcg_frame_ptr_yuv_360p = {
+ .frm = (struct uvcg_frame *)&uvcg_frame_yuv_360p,
+};
+
static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
.bLength = UVC_DT_FRAME_UNCOMPRESSED_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
@@ -212,18 +257,52 @@ static const struct UVC_FRAME_UNCOMPRESSED(1) uvc_frame_yuv_720p = {
.dwFrameInterval[0] = cpu_to_le32(5000000),
};
-static const struct uvc_format_mjpeg uvc_format_mjpg = {
- .bLength = UVC_DT_FORMAT_MJPEG_SIZE,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubType = UVC_VS_FORMAT_MJPEG,
- .bFormatIndex = 2,
- .bNumFrameDescriptors = 2,
- .bmFlags = 0,
- .bDefaultFrameIndex = 1,
- .bAspectRatioX = 0,
- .bAspectRatioY = 0,
- .bmInterlaceFlags = 0,
- .bCopyProtect = 0,
+static const struct uvcg_frame uvcg_frame_yuv_720p = {
+ .fmt_type = UVCG_UNCOMPRESSED,
+ .frame = {
+ .b_length = uvc_frame_yuv_720p.bLength,
+ .b_descriptor_type = uvc_frame_yuv_720p.bDescriptorType,
+ .b_descriptor_subtype = uvc_frame_yuv_720p.bDescriptorSubType,
+ .b_frame_index = uvc_frame_yuv_720p.bFrameIndex,
+ .bm_capabilities = uvc_frame_yuv_720p.bmCapabilities,
+ .w_width = uvc_frame_yuv_720p.wWidth,
+ .w_height = uvc_frame_yuv_720p.wHeight,
+ .dw_min_bit_rate = uvc_frame_yuv_720p.dwMinBitRate,
+ .dw_max_bit_rate = uvc_frame_yuv_720p.dwMaxBitRate,
+ .dw_max_video_frame_buffer_size = uvc_frame_yuv_720p.dwMaxVideoFrameBufferSize,
+ .dw_default_frame_interval = uvc_frame_yuv_720p.dwDefaultFrameInterval,
+ .b_frame_interval_type = uvc_frame_yuv_720p.bFrameIntervalType,
+ },
+ .dw_frame_interval = (u32 *)uvc_frame_yuv_720p.dwFrameInterval,
+};
+
+static struct uvcg_frame_ptr uvcg_frame_ptr_yuv_720p = {
+ .frm = (struct uvcg_frame *)&uvcg_frame_yuv_720p,
+};
+
+static struct uvcg_mjpeg uvcg_format_mjpeg = {
+ .fmt = {
+ .type = UVCG_MJPEG,
+ /* add to .frames and fill .num_frames at runtime */
+ .color_matching = (struct uvcg_color_matching *)&uvcg_color_matching,
+ },
+ .desc = {
+ .bLength = UVC_DT_FORMAT_MJPEG_SIZE,
+ .bDescriptorType = USB_DT_CS_INTERFACE,
+ .bDescriptorSubType = UVC_VS_FORMAT_MJPEG,
+ .bFormatIndex = 2,
+ .bNumFrameDescriptors = 2,
+ .bmFlags = 0,
+ .bDefaultFrameIndex = 1,
+ .bAspectRatioX = 0,
+ .bAspectRatioY = 0,
+ .bmInterlaceFlags = 0,
+ .bCopyProtect = 0,
+ },
+};
+
+static struct uvcg_format_ptr uvcg_format_ptr_mjpeg = {
+ .fmt = &uvcg_format_mjpeg.fmt,
};
DECLARE_UVC_FRAME_MJPEG(1);
@@ -247,6 +326,29 @@ static const struct UVC_FRAME_MJPEG(3) uvc_frame_mjpg_360p = {
.dwFrameInterval[2] = cpu_to_le32(5000000),
};
+static const struct uvcg_frame uvcg_frame_mjpeg_360p = {
+ .fmt_type = UVCG_MJPEG,
+ .frame = {
+ .b_length = uvc_frame_mjpg_360p.bLength,
+ .b_descriptor_type = uvc_frame_mjpg_360p.bDescriptorType,
+ .b_descriptor_subtype = uvc_frame_mjpg_360p.bDescriptorSubType,
+ .b_frame_index = uvc_frame_mjpg_360p.bFrameIndex,
+ .bm_capabilities = uvc_frame_mjpg_360p.bmCapabilities,
+ .w_width = uvc_frame_mjpg_360p.wWidth,
+ .w_height = uvc_frame_mjpg_360p.wHeight,
+ .dw_min_bit_rate = uvc_frame_mjpg_360p.dwMinBitRate,
+ .dw_max_bit_rate = uvc_frame_mjpg_360p.dwMaxBitRate,
+ .dw_max_video_frame_buffer_size = uvc_frame_mjpg_360p.dwMaxVideoFrameBufferSize,
+ .dw_default_frame_interval = uvc_frame_mjpg_360p.dwDefaultFrameInterval,
+ .b_frame_interval_type = uvc_frame_mjpg_360p.bFrameIntervalType,
+ },
+ .dw_frame_interval = (u32 *)uvc_frame_mjpg_360p.dwFrameInterval,
+};
+
+static struct uvcg_frame_ptr uvcg_frame_ptr_mjpeg_360p = {
+ .frm = (struct uvcg_frame *)&uvcg_frame_mjpeg_360p,
+};
+
static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
.bLength = UVC_DT_FRAME_MJPEG_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
@@ -263,13 +365,30 @@ static const struct UVC_FRAME_MJPEG(1) uvc_frame_mjpg_720p = {
.dwFrameInterval[0] = cpu_to_le32(5000000),
};
-static const struct uvc_color_matching_descriptor uvc_color_matching = {
- .bLength = UVC_DT_COLOR_MATCHING_SIZE,
- .bDescriptorType = USB_DT_CS_INTERFACE,
- .bDescriptorSubType = UVC_VS_COLORFORMAT,
- .bColorPrimaries = 1,
- .bTransferCharacteristics = 1,
- .bMatrixCoefficients = 4,
+static const struct uvcg_frame uvcg_frame_mjpeg_720p = {
+ .fmt_type = UVCG_MJPEG,
+ .frame = {
+ .b_length = uvc_frame_mjpg_720p.bLength,
+ .b_descriptor_type = uvc_frame_mjpg_720p.bDescriptorType,
+ .b_descriptor_subtype = uvc_frame_mjpg_720p.bDescriptorSubType,
+ .b_frame_index = uvc_frame_mjpg_720p.bFrameIndex,
+ .bm_capabilities = uvc_frame_mjpg_720p.bmCapabilities,
+ .w_width = uvc_frame_mjpg_720p.wWidth,
+ .w_height = uvc_frame_mjpg_720p.wHeight,
+ .dw_min_bit_rate = uvc_frame_mjpg_720p.dwMinBitRate,
+ .dw_max_bit_rate = uvc_frame_mjpg_720p.dwMaxBitRate,
+ .dw_max_video_frame_buffer_size = uvc_frame_mjpg_720p.dwMaxVideoFrameBufferSize,
+ .dw_default_frame_interval = uvc_frame_mjpg_720p.dwDefaultFrameInterval,
+ .b_frame_interval_typ = uvc_frame_mjpg_720p.bFrameIntervalType,
+ },
+ .dw_frame_interval = (u32 *)uvc_frame_mjpg_720p.dwFrameInterval,
+};
+
+static struct uvcg_frame_ptr uvcg_frame_ptr_mjpeg_720p = {
+ .frm = (struct uvcg_frame *)&uvcg_frame_mjpeg_360p,
+};
+
+static struct uvcg_streaming_header uvcg_streaming_header = {
};
static const struct uvc_descriptor_header * const uvc_fs_control_cls[] = {
@@ -290,40 +409,40 @@ static const struct uvc_descriptor_header * const uvc_ss_control_cls[] = {
static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
- (const struct uvc_descriptor_header *) &uvc_format_yuv,
+ (const struct uvc_descriptor_header *) &uvcg_format_yuv.desc,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
- (const struct uvc_descriptor_header *) &uvc_color_matching,
- (const struct uvc_descriptor_header *) &uvc_format_mjpg,
+ (const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
+ (const struct uvc_descriptor_header *) &uvcg_format_mjpeg.desc,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
- (const struct uvc_descriptor_header *) &uvc_color_matching,
+ (const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
NULL,
};
static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
- (const struct uvc_descriptor_header *) &uvc_format_yuv,
+ (const struct uvc_descriptor_header *) &uvcg_format_yuv.desc,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
- (const struct uvc_descriptor_header *) &uvc_color_matching,
- (const struct uvc_descriptor_header *) &uvc_format_mjpg,
+ (const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
+ (const struct uvc_descriptor_header *) &uvcg_format_mjpeg.desc,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
- (const struct uvc_descriptor_header *) &uvc_color_matching,
+ (const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
NULL,
};
static const struct uvc_descriptor_header * const uvc_ss_streaming_cls[] = {
(const struct uvc_descriptor_header *) &uvc_input_header,
- (const struct uvc_descriptor_header *) &uvc_format_yuv,
+ (const struct uvc_descriptor_header *) &uvcg_format_yuv.desc,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
(const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
- (const struct uvc_descriptor_header *) &uvc_color_matching,
- (const struct uvc_descriptor_header *) &uvc_format_mjpg,
+ (const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
+ (const struct uvc_descriptor_header *) &uvcg_format_mjpeg.desc,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
(const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
- (const struct uvc_descriptor_header *) &uvc_color_matching,
+ (const struct uvc_descriptor_header *) &uvcg_color_matching.desc,
NULL,
};
@@ -387,6 +506,23 @@ webcam_bind(struct usb_composite_dev *cdev)
uvc_opts->hs_streaming = uvc_hs_streaming_cls;
uvc_opts->ss_streaming = uvc_ss_streaming_cls;
+ INIT_LIST_HEAD(&uvcg_format_yuv.fmt.frames);
+ list_add_tail(&uvcg_frame_ptr_yuv_360p.entry, &uvcg_format_yuv.fmt.frames);
+ list_add_tail(&uvcg_frame_ptr_yuv_720p.entry, &uvcg_format_yuv.fmt.frames);
+ uvcg_format_yuv.fmt.num_frames = 2;
+
+ INIT_LIST_HEAD(&uvcg_format_mjpeg.fmt.frames);
+ list_add_tail(&uvcg_frame_ptr_mjpeg_360p.entry, &uvcg_format_mjpeg.fmt.frames);
+ list_add_tail(&uvcg_frame_ptr_mjpeg_720p.entry, &uvcg_format_mjpeg.fmt.frames);
+ uvcg_format_mjpeg.fmt.num_frames = 2;
+
+ INIT_LIST_HEAD(&uvcg_streaming_header.formats);
+ list_add_tail(&uvcg_format_ptr_yuv.entry, &uvcg_streaming_header.formats);
+ list_add_tail(&uvcg_format_ptr_mjpeg.entry, &uvcg_streaming_header.formats);
+ uvcg_streaming_header.num_fmt = 2;
+
+ uvc_opts->header = &uvcg_streaming_header;
+
/* Allocate string descriptor numbers ... note that string contents
* can be overridden by the composite_dev glue.
*/
base-commit: 33cc938e65a98f1d29d0a18403dbbee050dcad9a
--
2.25.1
