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path: root/drivers/media/video/uvc/uvc_video.c
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Diffstat (limited to 'drivers/media/video/uvc/uvc_video.c')
-rw-r--r--drivers/media/video/uvc/uvc_video.c39
1 files changed, 36 insertions, 3 deletions
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index 6f147de..af5c040 100644
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -19,7 +19,7 @@
#include <linux/videodev2.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
#include <asm/unaligned.h>
#include <media/v4l2-common.h>
@@ -790,8 +790,12 @@ static void uvc_free_urb_buffers(struct uvc_streaming *stream)
for (i = 0; i < UVC_URBS; ++i) {
if (stream->urb_buffer[i]) {
+#ifndef CONFIG_DMA_NONCOHERENT
usb_free_coherent(stream->dev->udev, stream->urb_size,
stream->urb_buffer[i], stream->urb_dma[i]);
+#else
+ kfree(stream->urb_buffer[i]);
+#endif
stream->urb_buffer[i] = NULL;
}
}
@@ -831,9 +835,14 @@ static int uvc_alloc_urb_buffers(struct uvc_streaming *stream,
for (; npackets > 1; npackets /= 2) {
for (i = 0; i < UVC_URBS; ++i) {
stream->urb_size = psize * npackets;
+#ifndef CONFIG_DMA_NONCOHERENT
stream->urb_buffer[i] = usb_alloc_coherent(
stream->dev->udev, stream->urb_size,
gfp_flags | __GFP_NOWARN, &stream->urb_dma[i]);
+#else
+ stream->urb_buffer[i] =
+ kmalloc(stream->urb_size, gfp_flags | __GFP_NOWARN);
+#endif
if (!stream->urb_buffer[i]) {
uvc_free_urb_buffers(stream);
break;
@@ -908,10 +917,14 @@ static int uvc_init_video_isoc(struct uvc_streaming *stream,
urb->context = stream;
urb->pipe = usb_rcvisocpipe(stream->dev->udev,
ep->desc.bEndpointAddress);
+#ifndef CONFIG_DMA_NONCOHERENT
urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+ urb->transfer_dma = stream->urb_dma[i];
+#else
+ urb->transfer_flags = URB_ISO_ASAP;
+#endif
urb->interval = ep->desc.bInterval;
urb->transfer_buffer = stream->urb_buffer[i];
- urb->transfer_dma = stream->urb_dma[i];
urb->complete = uvc_video_complete;
urb->number_of_packets = npackets;
urb->transfer_buffer_length = size;
@@ -969,8 +982,10 @@ static int uvc_init_video_bulk(struct uvc_streaming *stream,
usb_fill_bulk_urb(urb, stream->dev->udev, pipe,
stream->urb_buffer[i], size, uvc_video_complete,
stream);
+#ifndef CONFIG_DMA_NONCOHERENT
urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
urb->transfer_dma = stream->urb_dma[i];
+#endif
stream->urb[i] = urb;
}
@@ -1252,7 +1267,25 @@ int uvc_video_enable(struct uvc_streaming *stream, int enable)
if (!enable) {
uvc_uninit_video(stream, 1);
- usb_set_interface(stream->dev->udev, stream->intfnum, 0);
+ if (stream->intf->num_altsetting > 1) {
+ usb_set_interface(stream->dev->udev,
+ stream->intfnum, 0);
+ } else {
+ /* UVC doesn't specify how to inform a bulk-based device
+ * when the video stream is stopped. Windows sends a
+ * CLEAR_FEATURE(HALT) request to the video streaming
+ * bulk endpoint, mimic the same behaviour.
+ */
+ unsigned int epnum = stream->header.bEndpointAddress
+ & USB_ENDPOINT_NUMBER_MASK;
+ unsigned int dir = stream->header.bEndpointAddress
+ & USB_ENDPOINT_DIR_MASK;
+ unsigned int pipe;
+
+ pipe = usb_sndbulkpipe(stream->dev->udev, epnum) | dir;
+ usb_clear_halt(stream->dev->udev, pipe);
+ }
+
uvc_queue_enable(&stream->queue, 0);
return 0;
}