@@ -474,6 +474,25 @@ uvc_register_video(struct uvc_device *uvc)
} \
} while (0)
+#define UVC_COPY_XU_DESCRIPTOR(mem, dst, desc) \
+ do { \
+ *(dst)++ = mem; \
+ memcpy(mem, desc, 22); /* bLength to bNrInPins */ \
+ mem += 22; \
+ \
+ memcpy(mem, (desc)->baSourceID, (desc)->bNrInPins); \
+ mem += (desc)->bNrInPins; \
+ \
+ memcpy(mem, &(desc)->bControlSize, 1); \
+ mem++; \
+ \
+ memcpy(mem, (desc)->bmControls, (desc)->bControlSize); \
+ mem += (desc)->bControlSize; \
+ \
+ memcpy(mem, &(desc)->iExtension, 1); \
+ mem++; \
+ } while (0)
+
static struct usb_descriptor_header **
uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
{
@@ -485,6 +504,7 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
const struct usb_descriptor_header * const *src;
struct usb_descriptor_header **dst;
struct usb_descriptor_header **hdr;
+ struct uvcg_extension *xu;
unsigned int control_size;
unsigned int streaming_size;
unsigned int n_desc;
@@ -549,6 +569,13 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
bytes += (*src)->bLength;
n_desc++;
}
+
+ list_for_each_entry(xu, uvc->desc.extension_units, list) {
+ control_size += xu->desc.bLength;
+ bytes += xu->desc.bLength;
+ n_desc++;
+ }
+
for (src = (const struct usb_descriptor_header **)uvc_streaming_cls;
*src; ++src) {
streaming_size += (*src)->bLength;
@@ -575,6 +602,10 @@ uvc_copy_descriptors(struct uvc_device *uvc, enum usb_device_speed speed)
uvc_control_header = mem;
UVC_COPY_DESCRIPTORS(mem, dst,
(const struct usb_descriptor_header **)uvc_control_desc);
+
+ list_for_each_entry(xu, uvc->desc.extension_units, list)
+ UVC_COPY_XU_DESCRIPTOR(mem, dst, &xu->desc);
+
uvc_control_header->wTotalLength = cpu_to_le16(control_size);
uvc_control_header->bInCollection = 1;
uvc_control_header->baInterfaceNr[0] = uvc->streaming_intf;
@@ -1020,6 +1051,8 @@ static struct usb_function *uvc_alloc(struct usb_function_instance *fi)
return ERR_PTR(-EBUSY);
}
+ uvc->desc.extension_units = &opts->extension_units;
+
++opts->refcnt;
mutex_unlock(&opts->lock);
@@ -143,6 +143,7 @@ struct uvc_device {
const struct uvc_descriptor_header * const *fs_streaming;
const struct uvc_descriptor_header * const *hs_streaming;
const struct uvc_descriptor_header * const *ss_streaming;
+ struct list_head *extension_units;
} desc;
unsigned int control_intf;
Now that extension unit support is available through configfs we need to copy the descriptors for the XUs during uvc_function_bind() so that they're exposed to the usb subsystem. Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com> --- Laurent - I didn't add your tag because having switched it to a function I actually decided I preferred it this way and switched it back; too many pointers to pointers of things made it less easy to follow I think, but if you disagree let me know and I'll go ahead. Changes in v3: - Dropped a local variable. Changes in v2: - none drivers/usb/gadget/function/f_uvc.c | 33 +++++++++++++++++++++++++++++ drivers/usb/gadget/function/uvc.h | 1 + 2 files changed, 34 insertions(+)