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author | Laurent Pinchart <laurent.pinchart@skynet.be> | 2008-11-08 19:14:50 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-12-29 17:53:31 -0200 |
commit | 44f0079ec74330b457d990072c13cbe28b0f1abf (patch) | |
tree | a5af6ae41c4ff9dabc882d08cfda79a791d56430 /drivers/media/video/uvc/uvc_video.c | |
parent | 7e21fda17e7f6156e2ad66ca4f76abcbe1063eb2 (diff) | |
download | kernel_samsung_smdk4412-44f0079ec74330b457d990072c13cbe28b0f1abf.zip kernel_samsung_smdk4412-44f0079ec74330b457d990072c13cbe28b0f1abf.tar.gz kernel_samsung_smdk4412-44f0079ec74330b457d990072c13cbe28b0f1abf.tar.bz2 |
V4L/DVB (9570): uvcvideo: Handle failed video GET_{MIN|MAX|DEF} requests more gracefully
Failed requests will now generate a one-time warning message instead of the
usual "Failed to query..." error, which should be more user-friendly. The
driver will also recover automatically from failed GET_MIN/GET_MAX requests
when the device is half-broken without requiring the MINMAX quirk (fully
broken devices still need the quirk).
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/uvc/uvc_video.c')
-rw-r--r-- | drivers/media/video/uvc/uvc_video.c | 63 |
1 files changed, 52 insertions, 11 deletions
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c index b7bb238..4af9470 100644 --- a/drivers/media/video/uvc/uvc_video.c +++ b/drivers/media/video/uvc/uvc_video.c @@ -36,15 +36,22 @@ static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, { __u8 type = USB_TYPE_CLASS | USB_RECIP_INTERFACE; unsigned int pipe; - int ret; pipe = (query & 0x80) ? usb_rcvctrlpipe(dev->udev, 0) : usb_sndctrlpipe(dev->udev, 0); type |= (query & 0x80) ? USB_DIR_IN : USB_DIR_OUT; - ret = usb_control_msg(dev->udev, pipe, query, type, cs << 8, + return usb_control_msg(dev->udev, pipe, query, type, cs << 8, unit << 8 | intfnum, data, size, timeout); +} + +int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, + __u8 intfnum, __u8 cs, void *data, __u16 size) +{ + int ret; + ret = __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, + UVC_CTRL_CONTROL_TIMEOUT); if (ret != size) { uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u " "(unit %u) : %d (exp. %u).\n", query, cs, unit, ret, @@ -55,13 +62,6 @@ static int __uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, return 0; } -int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, - __u8 intfnum, __u8 cs, void *data, __u16 size) -{ - return __uvc_query_ctrl(dev, query, unit, intfnum, cs, data, size, - UVC_CTRL_CONTROL_TIMEOUT); -} - static void uvc_fixup_buffer_size(struct uvc_video_device *video, struct uvc_streaming_control *ctrl) { @@ -102,8 +102,36 @@ static int uvc_get_video_ctrl(struct uvc_video_device *video, ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum, probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, UVC_CTRL_STREAMING_TIMEOUT); - if (ret < 0) + + if ((query == GET_MIN || query == GET_MAX) && ret == 2) { + /* Some cameras, mostly based on Bison Electronics chipsets, + * answer a GET_MIN or GET_MAX request with the wCompQuality + * field only. + */ + uvc_warn_once(video->dev, UVC_WARN_MINMAX, "UVC non " + "compliance - GET_MIN/MAX(PROBE) incorrectly " + "supported. Enabling workaround.\n"); + memset(ctrl, 0, sizeof ctrl); + ctrl->wCompQuality = le16_to_cpup((__le16 *)data); + ret = 0; goto out; + } else if (query == GET_DEF && probe == 1) { + /* Many cameras don't support the GET_DEF request on their + * video probe control. Warn once and return, the caller will + * fall back to GET_CUR. + */ + uvc_warn_once(video->dev, UVC_WARN_PROBE_DEF, "UVC non " + "compliance - GET_DEF(PROBE) not supported. " + "Enabling workaround.\n"); + ret = -EIO; + goto out; + } else if (ret != size) { + uvc_printk(KERN_ERR, "Failed to query (%u) UVC %s control : " + "%d (exp. %u).\n", query, probe ? "probe" : "commit", + ret, size); + ret = -EIO; + goto out; + } ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]); ctrl->bFormatIndex = data[2]; @@ -138,13 +166,14 @@ static int uvc_get_video_ctrl(struct uvc_video_device *video, * Try to get the value from the format and frame descriptor. */ uvc_fixup_buffer_size(video, ctrl); + ret = 0; out: kfree(data); return ret; } -int uvc_set_video_ctrl(struct uvc_video_device *video, +static int uvc_set_video_ctrl(struct uvc_video_device *video, struct uvc_streaming_control *ctrl, int probe) { __u8 *data; @@ -186,6 +215,12 @@ int uvc_set_video_ctrl(struct uvc_video_device *video, video->streaming->intfnum, probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size, UVC_CTRL_STREAMING_TIMEOUT); + if (ret != size) { + uvc_printk(KERN_ERR, "Failed to set UVC %s control : " + "%d (exp. %u).\n", probe ? "probe" : "commit", + ret, size); + ret = -EIO; + } kfree(data); return ret; @@ -252,6 +287,12 @@ done: return ret; } +int uvc_commit_video(struct uvc_video_device *video, + struct uvc_streaming_control *probe) +{ + return uvc_set_video_ctrl(video, probe, 0); +} + /* ------------------------------------------------------------------------ * Video codecs */ |