V4L/DVB (10829): Support alternate resolutions for sq905

Add support for the alternate resolutions offered by SQ-905 based cameras. As
well as 320x240 all cameras can do 160x120 and some can do 640x480.

Signed-off-by: Adam Baker <linux@baker-net.org.uk>
Signed-off-by: Theodore Kilgore <kilgota@auburn.edu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 59 insertions, 41 deletions

diff --git a/drivers/media/video/gspca/sq905.c b/drivers/media/video/gspca/sq905.c
index dafaed69e9d0..da60eea51e44 100644
--- a/drivers/media/video/gspca/sq905.c
+++ b/drivers/media/video/gspca/sq905.c
@@ -60,23 +60,29 @@ MODULE_LICENSE("GPL");
 #define SQ905_PING      0x07    /* when reading an "idling" command */
 #define SQ905_READ_DONE 0xc0    /* ack bulk read completed */
 
+/* Any non-zero value in the bottom 2 bits of the 2nd byte of
+ * the ID appears to indicate the camera can do 640*480. If the
+ * LSB of that byte is set the image is just upside down, otherwise
+ * it is rotated 180 degrees. */
+#define SQ905_HIRES_MASK        0x00000300
+#define SQ905_ORIENTATION_MASK  0x00000100
+
 /* Some command codes. These go in the "index" slot. */
 
 #define SQ905_ID      0xf0      /* asks for model string */
 #define SQ905_CONFIG  0x20      /* gets photo alloc. table, not used here */
 #define SQ905_DATA    0x30      /* accesses photo data, not used here */
 #define SQ905_CLEAR   0xa0      /* clear everything */
-#define SQ905_CAPTURE_LOW 0x60  /* Starts capture at 160x120 */
-#define SQ905_CAPTURE_MED 0x61  /* Starts capture at 320x240 */
+#define SQ905_CAPTURE_LOW  0x60 /* Starts capture at 160x120 */
+#define SQ905_CAPTURE_MED  0x61 /* Starts capture at 320x240 */
+#define SQ905_CAPTURE_HIGH 0x62 /* Starts capture at 640x480 (some cams only) */
 /* note that the capture command also controls the output dimensions */
-/* 0x60 -> 160x120, 0x61 -> 320x240 0x62 -> 640x480 depends on camera */
-/* 0x62 is not correct, at least for some cams. Should be 0x63 ? */
 
 /* Structure to hold all of our device specific stuff */
 struct sd {
         struct gspca_dev gspca_dev;     /* !! must be the first item */
 
-        u8 cam_type;
+        const struct v4l2_pix_format *cap_mode;
 
         /*
          * Driver stuff
@@ -85,33 +91,24 @@ struct sd {
         struct workqueue_struct *work_thread;
 };
 
-/* The driver only supports 320x240 so far. */
-static struct v4l2_pix_format sq905_mode[1] = {
+static struct v4l2_pix_format sq905_mode[] = {
+        { 160, 120, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
+                .bytesperline = 160,
+                .sizeimage = 160 * 120,
+                .colorspace = V4L2_COLORSPACE_SRGB,
+                .priv = 0},
         { 320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
                 .bytesperline = 320,
                 .sizeimage = 320 * 240,
                 .colorspace = V4L2_COLORSPACE_SRGB,
+                .priv = 0},
+        { 640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
+                .bytesperline = 640,
+                .sizeimage = 640 * 480,
+                .colorspace = V4L2_COLORSPACE_SRGB,
                 .priv = 0}
 };
 
-struct cam_type {
-        u32 ident_word;
-        char *name;
-        struct v4l2_pix_format *min_mode;
-        u8 num_modes;
-        u8 sensor_flags;
-};
-
-#define SQ905_FLIP_HORIZ (1 << 0)
-#define SQ905_FLIP_VERT  (1 << 1)
-
-/* Last entry is default if nothing else matches */
-static struct cam_type cam_types[] = {
-        { 0x19010509, "PocketCam", &sq905_mode[0], 1, SQ905_FLIP_HORIZ },
-        { 0x32010509, "Magpix", &sq905_mode[0], 1, SQ905_FLIP_HORIZ },
-        { 0, "Default", &sq905_mode[0], 1, SQ905_FLIP_HORIZ | SQ905_FLIP_VERT }
-};
-
 /*
  * Send a command to the camera.
  */
@@ -240,7 +237,7 @@ static void sq905_dostream(struct work_struct *work)
 
                 /* request some data and then read it until we have
                  * a complete frame. */
-                bytes_left = sq905_mode[0].sizeimage + FRAME_HEADER_LEN;
+                bytes_left = dev->cap_mode->sizeimage + FRAME_HEADER_LEN;
                 header_read = 0;
                 discarding = 0;
 
@@ -272,11 +269,18 @@ static void sq905_dostream(struct work_struct *work)
                                 packet_type = INTER_PACKET;
                         }
                         frame = gspca_get_i_frame(gspca_dev);
-                        if (frame && !discarding)
+                        if (frame && !discarding) {
                                 gspca_frame_add(gspca_dev, packet_type,
                                                 frame, data, data_len);
-                        else
+                                /* If entire frame fits in one packet we still
+                                   need to add a LAST_PACKET */
+                                if ((packet_type == FIRST_PACKET) &&
+                                    (bytes_left == 0))
+                                        gspca_frame_add(gspca_dev, LAST_PACKET,
+                                                        frame, data, 0);
+                        } else {
                                 discarding = 1;
+                        }
                 }
                 /* acknowledge the frame */
                 mutex_lock(&gspca_dev->usb_lock);
@@ -301,8 +305,6 @@ static int sd_config(struct gspca_dev *gspca_dev,
         struct cam *cam = &gspca_dev->cam;
         struct sd *dev = (struct sd *) gspca_dev;
 
-        cam->cam_mode = sq905_mode;
-        cam->nmodes = 1;
         /* We don't use the buffer gspca allocates so make it small. */
         cam->bulk_size = 64;
 
@@ -328,7 +330,6 @@ static void sd_stop0(struct gspca_dev *gspca_dev)
 /* this function is called at probe and resume time */
 static int sd_init(struct gspca_dev *gspca_dev)
 {
-        struct sd *dev = (struct sd *) gspca_dev;
         u32 ident;
         int ret;
 
@@ -344,17 +345,18 @@ static int sd_init(struct gspca_dev *gspca_dev)
         ret = sq905_read_data(gspca_dev, gspca_dev->usb_buf, 4);
         if (ret < 0)
                 return ret;
-        /* usb_buf is allocated with kmalloc so is aligned. */
-        ident = le32_to_cpup((u32 *)gspca_dev->usb_buf);
+        /* usb_buf is allocated with kmalloc so is aligned.
+         * Camera model number is the right way round if we assume this
+         * reverse engineered ID is supposed to be big endian. */
+        ident = be32_to_cpup((__be32 *)gspca_dev->usb_buf);
         ret = sq905_command(gspca_dev, SQ905_CLEAR);
         if (ret < 0)
                 return ret;
-        dev->cam_type = 0;
-        while (dev->cam_type < ARRAY_SIZE(cam_types) - 1 &&
-               ident != cam_types[dev->cam_type].ident_word)
-                dev->cam_type++;
-        PDEBUG(D_CONF, "SQ905 camera %s, ID %08x detected",
-               cam_types[dev->cam_type].name, ident);
+        PDEBUG(D_CONF, "SQ905 camera ID %08x detected", ident);
+        gspca_dev->cam.cam_mode = sq905_mode;
+        gspca_dev->cam.nmodes = ARRAY_SIZE(sq905_mode);
+        if (!(ident & SQ905_HIRES_MASK))
+                gspca_dev->cam.nmodes--;
         return 0;
 }
 
@@ -364,13 +366,29 @@ static int sd_start(struct gspca_dev *gspca_dev)
         struct sd *dev = (struct sd *) gspca_dev;
         int ret;
 
+        /* Set capture mode based on selected resolution. */
+        dev->cap_mode = gspca_dev->cam.cam_mode;
         /* "Open the shutter" and set size, to start capture */
-        ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_MED);
+        switch (gspca_dev->width) {
+        case 640:
+                PDEBUG(D_STREAM, "Start streaming at high resolution");
+                dev->cap_mode += 2;
+                ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_HIGH);
+                break;
+        case 320:
+                PDEBUG(D_STREAM, "Start streaming at medium resolution");
+                dev->cap_mode++;
+                ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_MED);
+                break;
+        default:
+                PDEBUG(D_STREAM, "Start streaming at low resolution");
+                ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_LOW);
+        }
+
         if (ret < 0) {
                 PDEBUG(D_ERR, "Start streaming command failed");
                 return ret;
         }
-
         /* Start the workqueue function to do the streaming */
         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
         queue_work(dev->work_thread, &dev->work_struct);