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>

4 files changed, 66 insertions, 141 deletions

diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 11398ee66320..1e3b4fe5ae93 100644
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -1726,24 +1726,6 @@ static int uvc_reset_resume(struct usb_interface *intf)
  * though they are compliant.
  */
 static struct usb_device_id uvc_ids[] = {
-        /* ALi M5606 (Clevo M540SR) */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x0402,
-          .idProduct            = 0x5606,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Creative Live! Optia */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x041e,
-          .idProduct            = 0x4057,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
         /* Microsoft Lifecam NX-6000 */
         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
                                 | USB_DEVICE_ID_MATCH_INT_INFO,
@@ -1829,15 +1811,6 @@ static struct usb_device_id uvc_ids[] = {
           .bInterfaceSubClass   = 1,
           .bInterfaceProtocol   = 0,
           .driver_info          = UVC_QUIRK_STREAM_NO_FID },
-        /* Silicon Motion SM371 */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x090c,
-          .idProduct            = 0xb371,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
         /* MT6227 */
         { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
                                 | USB_DEVICE_ID_MATCH_INT_INFO,
@@ -1922,105 +1895,6 @@ static struct usb_device_id uvc_ids[] = {
           .bInterfaceProtocol   = 0,
           .driver_info          = UVC_QUIRK_PROBE_MINMAX
                                 | UVC_QUIRK_IGNORE_SELECTOR_UNIT},
-        /* Acer OEM Webcam - Unknown vendor */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0100,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Packard Bell OEM Webcam - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0101,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Acer Crystal Eye webcam - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0102,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Compaq Presario B1200 - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0104,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Acer Travelmate 7720 - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0105,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Medion Akoya Mini E1210 - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0141,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Acer OrbiCam - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0200,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /*  Fujitsu Amilo SI2636 - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0202,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /*  Advent 4211 - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0203,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0300,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
-        /* Clevo M570TU - Bison Electronics */
-        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
-                                | USB_DEVICE_ID_MATCH_INT_INFO,
-          .idVendor             = 0x5986,
-          .idProduct            = 0x0303,
-          .bInterfaceClass      = USB_CLASS_VIDEO,
-          .bInterfaceSubClass   = 1,
-          .bInterfaceProtocol   = 0,
-          .driver_info          = UVC_QUIRK_PROBE_MINMAX },
         /* Generic USB Video Class */
         { USB_INTERFACE_INFO(USB_CLASS_VIDEO, 1, 0) },
         {}
diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c
index 8361367806a9..624bf74de673 100644
--- a/drivers/media/video/uvc/uvc_v4l2.c
+++ b/drivers/media/video/uvc/uvc_v4l2.c
@@ -252,7 +252,7 @@ static int uvc_v4l2_set_format(struct uvc_video_device *video,
         if (ret < 0)
                 return ret;
 
-        if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
+        if ((ret = uvc_commit_video(video, &probe)) < 0)
                 return ret;
 
         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
@@ -316,7 +316,7 @@ static int uvc_v4l2_set_streamparm(struct uvc_video_device *video,
                 return ret;
 
         /* Commit the new settings. */
-        if ((ret = uvc_set_video_ctrl(video, &probe, 0)) < 0)
+        if ((ret = uvc_commit_video(video, &probe)) < 0)
                 return ret;
 
         memcpy(&video->streaming->ctrl, &probe, sizeof probe);
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index b7bb23820d80..4af94707ef69 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
  */
diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
index 9a6bc1aafb16..595b90ee6528 100644
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -617,6 +617,7 @@ enum uvc_device_state {
 struct uvc_device {
         struct usb_device *udev;
         struct usb_interface *intf;
+        unsigned long warnings;
         __u32 quirks;
         int intfnum;
         char name[32];
@@ -679,6 +680,9 @@ struct uvc_driver {
 #define UVC_TRACE_SUSPEND       (1 << 8)
 #define UVC_TRACE_STATUS        (1 << 9)
 
+#define UVC_WARN_MINMAX         0
+#define UVC_WARN_PROBE_DEF      1
+
 extern unsigned int uvc_trace_param;
 
 #define uvc_trace(flag, msg...) \
@@ -687,6 +691,12 @@ extern unsigned int uvc_trace_param;
                         printk(KERN_DEBUG "uvcvideo: " msg); \
         } while (0)
 
+#define uvc_warn_once(dev, warn, msg...) \
+        do { \
+                if (!test_and_set_bit(warn, &dev->warnings)) \
+                        printk(KERN_INFO "uvcvideo: " msg); \
+        } while (0)
+
 #define uvc_printk(level, msg...) \
         printk(level "uvcvideo: " msg)
 
@@ -740,10 +750,10 @@ extern int uvc_video_resume(struct uvc_video_device *video);
 extern int uvc_video_enable(struct uvc_video_device *video, int enable);
 extern int uvc_probe_video(struct uvc_video_device *video,
                 struct uvc_streaming_control *probe);
+extern int uvc_commit_video(struct uvc_video_device *video,
+                struct uvc_streaming_control *ctrl);
 extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit,
                 __u8 intfnum, __u8 cs, void *data, __u16 size);
-extern int uvc_set_video_ctrl(struct uvc_video_device *video,
-                struct uvc_streaming_control *ctrl, int probe);
 
 /* Status */
 extern int uvc_status_init(struct uvc_device *dev);