V4L/DVB (8153): Subdriver pac207 added and minor changes.
Hans de Goede [Wed, 23 Apr 2008 11:09:12 +0000 (08:09 -0300)]
pac207 added.
Check status on mutex lock.
Call back on frame dequeue.
Free the resources on last close only.
Avoid URB and ISOC errors on close.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/gspca/Makefile
drivers/media/video/gspca/gspca.c
drivers/media/video/gspca/gspca.h
drivers/media/video/gspca/pac207.c [new file with mode: 0644]

index 885d445..81170c1 100644 (file)
@@ -1,4 +1,5 @@
-obj-$(CONFIG_GSPCA)    += gspca_main.o gspca_stk014.o
+obj-$(CONFIG_GSPCA)    += gspca_main.o gspca_pac207.o gspca_stk014.o
 
 gspca_main-objs := gspca.o
+gspca_pac207-objs := pac207.o
 gspca_stk014-objs := stk014.o
index 4fe082f..c4735e1 100644 (file)
@@ -39,8 +39,8 @@ MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
 MODULE_DESCRIPTION("GSPCA USB Camera Driver");
 MODULE_LICENSE("GPL");
 
-#define DRIVER_VERSION_NUMBER  KERNEL_VERSION(0, 0, 26)
-static const char version[] = "0.0.26";
+#define DRIVER_VERSION_NUMBER  KERNEL_VERSION(0, 0, 30)
+static const char version[] = "0.0.30";
 
 static int video_nr = -1;
 
@@ -172,8 +172,7 @@ struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
 {
        int i, j;
 
-       PDEBUG(D_PACK, "add t:%d l:%d %02x %02x %02x %02x...",
-               packet_type, len, data[0], data[1], data[2], data[3]);
+       PDEBUG(D_PACK, "add t:%d l:%d", packet_type, len);
 
        /* when start of a new frame, if the current frame buffer
         * is not queued, discard the whole frame */
@@ -346,7 +345,6 @@ static int gspca_kill_transfer(struct gspca_dev *gspca_dev)
        unsigned int i;
 
        PDEBUG(D_STREAM, "kill transfer");
-       gspca_dev->streaming = 0;
        for (i = 0; i < NURBS; ++i) {
                urb = gspca_dev->pktbuf[i].urb;
                if (urb == NULL)
@@ -501,9 +499,8 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
        struct usb_host_endpoint *ep;
        int n, ret;
 
-       ret = mutex_lock_interruptible(&gspca_dev->usb_lock);
-       if (ret < 0)
-               return ret;
+       if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+               return -ERESTARTSYS;
 
        /* set the max alternate setting and loop until urb submit succeeds */
        intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
@@ -531,6 +528,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
                        if (ret < 0) {
                                PDEBUG(D_ERR|D_STREAM,
                                        "usb_submit_urb [%d] err %d", n, ret);
+                               gspca_dev->streaming = 0;
                                gspca_kill_transfer(gspca_dev);
                                if (ret == -ENOSPC)
                                        break;  /* try the previous alt */
@@ -555,9 +553,9 @@ static int gspca_set_alt0(struct gspca_dev *gspca_dev)
        return ret;
 }
 
+/* Note both the queue and the usb lock should be hold when calling this */
 static void gspca_stream_off(struct gspca_dev *gspca_dev)
 {
-       mutex_lock_interruptible(&gspca_dev->usb_lock);
        gspca_dev->streaming = 0;
        if (gspca_dev->present) {
                gspca_dev->sd_desc->stopN(gspca_dev);
@@ -571,7 +569,6 @@ static void gspca_stream_off(struct gspca_dev *gspca_dev)
                wake_up_interruptible(&gspca_dev->wq);
                PDEBUG(D_ERR|D_STREAM, "stream off no device ??");
        }
-       mutex_unlock(&gspca_dev->usb_lock);
 }
 
 static int gspca_set_default_mode(struct gspca_dev *gspca_dev)
@@ -791,9 +788,7 @@ static int vidioc_try_fmt_cap(struct file *file,
 {
        int ret;
 
-/*     mutex_lock_interruptible(&gspca_dev->queue_lock); */
        ret = try_fmt_cap(file, priv, fmt);
-/*     mutex_unlock(&gspca_dev->queue_lock); */
        if (ret < 0)
                return ret;
        return 0;
@@ -812,7 +807,8 @@ static int vidioc_s_fmt_cap(struct file *file, void *priv,
                        fmt->fmt.pix.width, fmt->fmt.pix.height);
        }
 #endif
-       mutex_lock_interruptible(&gspca_dev->queue_lock);
+       if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+               return -ERESTARTSYS;
        ret = try_fmt_cap(file, priv, fmt);
        if (ret < 0)
                goto out;
@@ -820,8 +816,14 @@ static int vidioc_s_fmt_cap(struct file *file, void *priv,
        if (ret == gspca_dev->curr_mode)
                goto out;                       /* same mode */
        was_streaming = gspca_dev->streaming;
-       if (was_streaming != 0)
+       if (was_streaming != 0) {
+               if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
+                       ret = -ERESTARTSYS;
+                       goto out;
+               }
                gspca_stream_off(gspca_dev);
+               mutex_unlock(&gspca_dev->usb_lock);
+       }
        gspca_dev->width = (int) fmt->fmt.pix.width;
        gspca_dev->height = (int) fmt->fmt.pix.height;
        gspca_dev->pixfmt = fmt->fmt.pix.pixelformat;
@@ -840,9 +842,8 @@ static int dev_open(struct inode *inode, struct file *file)
 
        PDEBUG(D_STREAM, "opening");
        gspca_dev = (struct gspca_dev *) video_devdata(file);
-       ret = mutex_lock_interruptible(&gspca_dev->queue_lock);
-       if (ret < 0)
-               return ret;
+       if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+               return -ERESTARTSYS;
        if (!gspca_dev->present) {
                ret = -ENODEV;
                goto out;
@@ -850,16 +851,17 @@ static int dev_open(struct inode *inode, struct file *file)
 
        /* if not done yet, initialize the sensor */
        if (gspca_dev->users == 0) {
-               ret = mutex_lock_interruptible(&gspca_dev->usb_lock);
-               if (ret < 0)
+               if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
+                       ret = -ERESTARTSYS;
                        goto out;
+               }
                ret = gspca_dev->sd_desc->open(gspca_dev);
                mutex_unlock(&gspca_dev->usb_lock);
                if (ret != 0) {
                        PDEBUG(D_ERR|D_CONF, "init device failed %d", ret);
                        goto out;
                }
-       } else if (gspca_dev->users > 8) {      /* (arbitrary value) */
+       } else if (gspca_dev->users > 4) {      /* (arbitrary value) */
                ret = -EBUSY;
                goto out;
        }
@@ -886,21 +888,20 @@ static int dev_close(struct inode *inode, struct file *file)
        struct gspca_dev *gspca_dev = file->private_data;
 
        PDEBUG(D_STREAM, "closing");
-       if (gspca_dev->streaming) {
-               mutex_lock_interruptible(&gspca_dev->queue_lock);
-               gspca_stream_off(gspca_dev);
+       if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+               return -ERESTARTSYS;
+       gspca_dev->users--;
+       if (gspca_dev->users > 0) {
                mutex_unlock(&gspca_dev->queue_lock);
+               return 0;
        }
-       mutex_lock_interruptible(&gspca_dev->usb_lock);
+
+       if (gspca_dev->streaming)
+               gspca_stream_off(gspca_dev);
        gspca_dev->sd_desc->close(gspca_dev);
-       mutex_unlock(&gspca_dev->usb_lock);
-       atomic_inc(&gspca_dev->nevent);
-       wake_up_interruptible(&gspca_dev->wq);  /* wake blocked processes */
-       schedule();
-       mutex_lock_interruptible(&gspca_dev->queue_lock);
+
        frame_free(gspca_dev);
        file->private_data = NULL;
-       gspca_dev->users--;
        mutex_unlock(&gspca_dev->queue_lock);
        PDEBUG(D_STREAM, "closed");
        return 0;
@@ -964,7 +965,8 @@ static int vidioc_s_ctrl(struct file *file, void *priv,
                    && ctrl->value > ctrls->qctrl.maximum)
                        return -ERANGE;
                PDEBUG(D_CONF, "set ctrl [%08x] = %d", ctrl->id, ctrl->value);
-               mutex_lock_interruptible(&gspca_dev->usb_lock);
+               if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+                       return -ERESTARTSYS;
                ret = ctrls->set(gspca_dev, ctrl->value);
                mutex_unlock(&gspca_dev->usb_lock);
                return ret;
@@ -985,7 +987,8 @@ static int vidioc_g_ctrl(struct file *file, void *priv,
             i++, ctrls++) {
                if (ctrl->id != ctrls->qctrl.id)
                        continue;
-               mutex_lock_interruptible(&gspca_dev->usb_lock);
+               if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+                       return -ERESTARTSYS;
                ret = ctrls->get(gspca_dev, &ctrl->value);
                mutex_unlock(&gspca_dev->usb_lock);
                return ret;
@@ -1047,9 +1050,8 @@ static int vidioc_reqbufs(struct file *file, void *priv,
        frsz = gspca_get_buff_size(gspca_dev);
        if (frsz < 0)
                return frsz;
-       ret = mutex_lock_interruptible(&gspca_dev->queue_lock);
-       if (ret < 0)
-               return ret;
+       if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+               return -ERESTARTSYS;
        ret = frame_alloc(gspca_dev,
                                rb->count,
                                (unsigned int) frsz,
@@ -1087,9 +1089,8 @@ static int vidioc_streamon(struct file *file, void *priv,
        PDEBUG(D_STREAM, "stream on");
        if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                return -EINVAL;
-       ret = mutex_lock_interruptible(&gspca_dev->queue_lock);
-       if (ret < 0)
-               return ret;
+       if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+               return -ERESTARTSYS;
        if (!gspca_dev->present) {
                ret = -ENODEV;
                goto out;
@@ -1111,6 +1112,7 @@ static int vidioc_streamon(struct file *file, void *priv,
                        gspca_dev->height);
        }
 #endif
+       ret = 0;
 out:
        mutex_unlock(&gspca_dev->queue_lock);
        return ret;
@@ -1125,8 +1127,14 @@ static int vidioc_streamoff(struct file *file, void *priv,
        if (buf_type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
                return -EINVAL;
        if (gspca_dev->streaming) {
-               mutex_lock_interruptible(&gspca_dev->queue_lock);
+               if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+                       return -ERESTARTSYS;
+               if (mutex_lock_interruptible(&gspca_dev->usb_lock)) {
+                       mutex_unlock(&gspca_dev->queue_lock);
+                       return -ERESTARTSYS;
+               }
                gspca_stream_off(gspca_dev);
+               mutex_unlock(&gspca_dev->usb_lock);
                mutex_unlock(&gspca_dev->queue_lock);
        }
        return 0;
@@ -1140,7 +1148,8 @@ static int vidioc_g_jpegcomp(struct file *file, void *priv,
 
        if (!gspca_dev->sd_desc->get_jcomp)
                return -EINVAL;
-       mutex_lock_interruptible(&gspca_dev->usb_lock);
+       if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+               return -ERESTARTSYS;
        ret = gspca_dev->sd_desc->get_jcomp(gspca_dev, jpegcomp);
        mutex_unlock(&gspca_dev->usb_lock);
        return ret;
@@ -1152,7 +1161,8 @@ static int vidioc_s_jpegcomp(struct file *file, void *priv,
        struct gspca_dev *gspca_dev = priv;
        int ret;
 
-       mutex_lock_interruptible(&gspca_dev->usb_lock);
+       if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+               return -ERESTARTSYS;
        if (!gspca_dev->sd_desc->set_jcomp)
                return -EINVAL;
        ret = gspca_dev->sd_desc->set_jcomp(gspca_dev, jpegcomp);
@@ -1177,7 +1187,8 @@ static int vidioc_s_parm(struct file *filp, void *priv,
        struct gspca_dev *gspca_dev = priv;
        int n;
 
-       mutex_lock_interruptible(&gspca_dev->usb_lock);
+       if (mutex_lock_interruptible(&gspca_dev->usb_lock))
+               return -ERESTARTSYS;
        n = parm->parm.capture.readbuffers;
        if (n == 0 || n > GSPCA_MAX_FRAMES)
                parm->parm.capture.readbuffers = gspca_dev->nbufread;
@@ -1230,10 +1241,8 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma)
        size = vma->vm_end - vma->vm_start;
        PDEBUG(D_STREAM, "mmap start:%08x size:%d", (int) start, (int) size);
 
-       ret = mutex_lock_interruptible(&gspca_dev->queue_lock);
-       if (ret < 0)
-               return ret;
-/* sanity check disconnect, in use, no memory available */
+       if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+               return -ERESTARTSYS;
        if (!gspca_dev->present) {
                ret = -ENODEV;
                goto done;
@@ -1294,6 +1303,7 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma)
                                                V4L2_BUF_FLAG_MAPPED;
        }
 #endif
+       ret = 0;
 done:
        mutex_unlock(&gspca_dev->queue_lock);
        return ret;
@@ -1350,6 +1360,8 @@ static int gspca_frame_wait(struct gspca_dev *gspca_dev,
                                        atomic_read(&gspca_dev->nevent) > 0);
                if (ret != 0)
                        return ret;
+               if (!gspca_dev->streaming || !gspca_dev->present)
+                       return -EIO;
                i = gspca_dev->fr_o;
                j = gspca_dev->fr_queue[i];
                frame = &gspca_dev->frame[j];
@@ -1364,6 +1376,10 @@ ok:
                gspca_dev->fr_q,
                gspca_dev->fr_i,
                gspca_dev->fr_o);
+
+       if (gspca_dev->sd_desc->dq_callback)
+               gspca_dev->sd_desc->dq_callback(gspca_dev);
+
        return j;
 }
 
@@ -1435,9 +1451,9 @@ static int vidioc_qbuf(struct file *file, void *priv,
                return -EINVAL;
        }
 
-       ret = mutex_lock_interruptible(&gspca_dev->queue_lock);
-       if (ret < 0)
-               return ret;
+       if (mutex_lock_interruptible(&gspca_dev->queue_lock))
+               return -ERESTARTSYS;
+
        if (frame->v4l2_buf.flags
                        & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE)) {
                PDEBUG(D_STREAM, "qbuf bad state");
@@ -1708,11 +1724,12 @@ void gspca_disconnect(struct usb_interface *intf)
        if (!gspca_dev)
                return;
        gspca_dev->present = 0;
-       mutex_lock_interruptible(&gspca_dev->queue_lock);
-       mutex_lock_interruptible(&gspca_dev->usb_lock);
+       mutex_lock(&gspca_dev->queue_lock);
+       mutex_lock(&gspca_dev->usb_lock);
+       gspca_dev->streaming = 0;
        gspca_kill_transfer(gspca_dev);
-       mutex_unlock(&gspca_dev->queue_lock);
        mutex_unlock(&gspca_dev->usb_lock);
+       mutex_unlock(&gspca_dev->queue_lock);
        while (gspca_dev->users != 0) {         /* wait until fully closed */
                atomic_inc(&gspca_dev->nevent);
                wake_up_interruptible(&gspca_dev->wq);  /* wake processes */
index 1394ab1..3bfb364 100644 (file)
@@ -90,17 +90,18 @@ struct ctrl {
 /* subdriver description */
 struct sd_desc {
 /* information */
-       char *name;                     /* sub-driver name */
+       char *name;             /* sub-driver name */
 /* controls */
        struct ctrl *ctrls;
        int nctrls;
 /* operations */
-       cam_cf_op config;               /* called on probe */
-       cam_op open;                    /* called on open */
-       cam_v_op start;                 /* called on stream on */
-       cam_v_op stopN;                 /* called on stream off - main alt */
-       cam_v_op stop0;                 /* called on stream off - alt 0 */
-       cam_v_op close;                 /* called on close */
+       cam_cf_op config;       /* called on probe */
+       cam_op open;            /* called on open */
+       cam_v_op start;         /* called on stream on */
+       cam_v_op stopN;         /* called on stream off - main alt */
+       cam_v_op stop0;         /* called on stream off - alt 0 */
+       cam_v_op close;         /* called on close */
+       cam_v_op dq_callback;   /* called when a frame has been dequeued */
        cam_pkt_op pkt_scan;
        cam_jpg_op get_jcomp;
        cam_jpg_op set_jcomp;
@@ -167,8 +168,6 @@ int gspca_dev_probe(struct usb_interface *intf,
                const struct usb_device_id *id,
                const struct sd_desc *sd_desc,
                int dev_size);
-int gspca_dev_init(struct gspca_dev *gspca_dev,
-                  struct usb_interface *intf);
 void gspca_disconnect(struct usb_interface *intf);
 struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
                                    int packet_type,
diff --git a/drivers/media/video/gspca/pac207.c b/drivers/media/video/gspca/pac207.c
new file mode 100644 (file)
index 0000000..ac16c73
--- /dev/null
@@ -0,0 +1,939 @@
+/*
+ * Pixart PAC207BCA library
+ *
+ * Copyright (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
+ * Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
+ * Copyleft (C) 2005 Michel Xhaard mxhaard@magic.fr
+ *
+ * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#define MODULE_NAME "pac207"
+
+#include "gspca.h"
+
+#define DRIVER_VERSION_NUMBER  KERNEL_VERSION(0, 0, 30)
+static const char version[] = "0.0.30";
+
+MODULE_AUTHOR("Hans de Goede <j.w.r.degoede@hhs.nl>");
+MODULE_DESCRIPTION("Pixart PAC207");
+MODULE_LICENSE("GPL");
+
+#define PAC207_CTRL_TIMEOUT            100  /* ms */
+
+#define PAC207_BRIGHTNESS_MIN          0
+#define PAC207_BRIGHTNESS_MAX          255
+#define PAC207_BRIGHTNESS_DEFAULT      4 /* power on default: 4 */
+
+#define PAC207_EXPOSURE_MIN            4
+#define PAC207_EXPOSURE_MAX            26
+#define PAC207_EXPOSURE_DEFAULT                4 /* power on default: 3 ?? */
+#define PAC207_EXPOSURE_KNEE           11 /* 4 = 30 fps, 11 = 8, 15 = 6 */
+
+#define PAC207_GAIN_MIN                        0
+#define PAC207_GAIN_MAX                        31
+#define PAC207_GAIN_DEFAULT            9 /* power on default: 9 */
+#define PAC207_GAIN_KNEE               20
+
+#define PAC207_AUTOGAIN_DEADZONE       30
+/* We calculating the autogain at the end of the transfer of a frame, at this
+   moment a frame with the old settings is being transmitted, and a frame is
+   being captured with the old settings. So if we adjust the autogain we must
+   ignore atleast the 2 next frames for the new settings to come into effect
+   before doing any other adjustments */
+#define PAC207_AUTOGAIN_IGNORE_FRAMES  3
+
+enum pac207_line_state {
+       LINE_HEADER1,
+       LINE_HEADER2,
+       LINE_UNCOMPRESSED,
+       LINE_COMPRESSED,
+};
+
+struct pac207_decoder_state {
+       /* generic state */
+       u16 line_read;
+       u16 line_marker;
+       u8 line_state;
+       u8 header_read;
+       /* compression state */
+       u16 processed_bytes;
+       u8 remaining_bits;
+       s8 no_remaining_bits;
+       u8 get_abs;
+       u8 discard_byte;
+       u8 line_decode_buf[352];
+};
+
+/* specific webcam descriptor */
+struct sd {
+       struct gspca_dev gspca_dev;             /* !! must be the first item */
+
+       struct pac207_decoder_state decoder_state;
+
+       u8 mode;
+
+       u8 brightness;
+       u8 exposure;
+       u8 autogain;
+       u8 gain;
+
+       u8 sof_read;
+       u8 autogain_ignore_frames;
+
+       atomic_t avg_lum;
+};
+
+/* V4L2 controls supported by the driver */
+static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val);
+static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val);
+static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val);
+static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val);
+static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val);
+static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val);
+static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val);
+static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val);
+
+static struct ctrl sd_ctrls[] = {
+#define SD_BRIGHTNESS 0
+       {
+           {
+               .id      = V4L2_CID_BRIGHTNESS,
+               .type    = V4L2_CTRL_TYPE_INTEGER,
+               .name    = "Brightness",
+               .minimum = PAC207_BRIGHTNESS_MIN,
+               .maximum = PAC207_BRIGHTNESS_MAX,
+               .step = 1,
+               .default_value = PAC207_BRIGHTNESS_DEFAULT,
+               .flags = 0,
+           },
+           .set = sd_setbrightness,
+           .get = sd_getbrightness,
+       },
+#define SD_EXPOSURE 1
+       {
+           {
+               .id = V4L2_CID_EXPOSURE,
+               .type = V4L2_CTRL_TYPE_INTEGER,
+               .name = "exposure",
+               .minimum = PAC207_EXPOSURE_MIN,
+               .maximum = PAC207_EXPOSURE_MAX,
+               .step = 1,
+               .default_value = PAC207_EXPOSURE_DEFAULT,
+               .flags = 0,
+           },
+           .set = sd_setexposure,
+           .get = sd_getexposure,
+       },
+#define SD_AUTOGAIN 2
+       {
+           {
+               .id       = V4L2_CID_AUTOGAIN,
+               .type   = V4L2_CTRL_TYPE_BOOLEAN,
+               .name   = "Auto Gain",
+               .minimum = 0,
+               .maximum = 1,
+               .step   = 1,
+               .default_value = 1,
+               .flags = 0,
+           },
+           .set = sd_setautogain,
+           .get = sd_getautogain,
+       },
+#define SD_GAIN 3
+       {
+           {
+               .id = V4L2_CID_GAIN,
+               .type = V4L2_CTRL_TYPE_INTEGER,
+               .name = "gain",
+               .minimum = PAC207_GAIN_MIN,
+               .maximum = PAC207_GAIN_MAX,
+               .step = 1,
+               .default_value = PAC207_GAIN_DEFAULT,
+               .flags = 0,
+           },
+           .set = sd_setgain,
+           .get = sd_getgain,
+       },
+};
+
+static struct cam_mode sif_mode[] = {
+       {V4L2_PIX_FMT_SBGGR8, 176, 144, 1},
+       {V4L2_PIX_FMT_SBGGR8, 352, 288, 0},
+};
+
+static const __u8 pac207_sensor_init[][8] = {
+       {0x10, 0x12, 0x0d, 0x12, 0x0c, 0x01, 0x29, 0xf0},
+       {0x00, 0x64, 0x64, 0x64, 0x04, 0x10, 0xf0, 0x30},
+       {0x00, 0x00, 0x00, 0x70, 0xa0, 0xf8, 0x00, 0x00},
+       {0x00, 0x00, 0x32, 0x00, 0x96, 0x00, 0xa2, 0x02},
+       {0x32, 0x00, 0x96, 0x00, 0xA2, 0x02, 0xaf, 0x00},
+};
+
+                       /* 48 reg_72 Rate Control end BalSize_4a =0x36 */
+static const __u8 PacReg72[] = { 0x00, 0x00, 0x36, 0x00 };
+
+static const char pac207_sof_marker[5] = { 0xff, 0xff, 0x00, 0xff, 0x96 };
+
+int pac207_write_regs(struct gspca_dev *gspca_dev, u16 index,
+       const u8 *buffer, u16 length)
+{
+       struct usb_device *udev = gspca_dev->dev;
+       int err;
+       u8 kbuf[8];
+
+       memcpy(kbuf, buffer, length);
+
+       err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x01,
+                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
+                       0x00, index, kbuf, length, PAC207_CTRL_TIMEOUT);
+       if (err < 0)
+               PDEBUG(D_ERR,
+                       "Failed to write registers to index 0x%04X, error %d)",
+                       index, err);
+
+       return err;
+}
+
+
+int pac207_write_reg(struct gspca_dev *gspca_dev, u16 index, u16 value)
+{
+       struct usb_device *udev = gspca_dev->dev;
+       int err;
+
+       err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x00,
+                       USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
+                       value, index, NULL, 0, PAC207_CTRL_TIMEOUT);
+       if (err)
+               PDEBUG(D_ERR, "Failed to write a register (index 0x%04X,"
+                       " value 0x%02X, error %d)", index, value, err);
+
+       return err;
+}
+
+
+int pac207_read_reg(struct gspca_dev *gspca_dev, u16 index)
+{
+       struct usb_device *udev = gspca_dev->dev;
+       u8 buff;
+       int res;
+
+       res = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 0x00,
+                       USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
+                       0x00, index, &buff, 1, PAC207_CTRL_TIMEOUT);
+       if (res < 0) {
+               PDEBUG(D_ERR,
+                       "Failed to read a register (index 0x%04X, error %d)",
+                       index, res);
+               return res;
+       }
+
+       return buff;
+}
+
+
+/* this function is called at probe time */
+static int sd_config(struct gspca_dev *gspca_dev,
+                       const struct usb_device_id *id)
+{
+       struct cam *cam;
+       u8 idreg[2];
+
+       idreg[0] = pac207_read_reg(gspca_dev, 0x0000);
+       idreg[1] = pac207_read_reg(gspca_dev, 0x0001);
+       idreg[0] = ((idreg[0] & 0x0F) << 4) | ((idreg[1] & 0xf0) >> 4);
+       idreg[1] = idreg[1] & 0x0f;
+       PDEBUG(D_PROBE, "Pixart Sensor ID 0x%02X Chips ID 0x%02X",
+               idreg[0], idreg[1]);
+
+       if (idreg[0] != 0x27) {
+               PDEBUG(D_PROBE, "Error invalid sensor ID!");
+               return -ENODEV;
+       }
+
+       pac207_write_reg(gspca_dev, 0x41, 0x00);
+                               /* Bit_0=Image Format,
+                                * Bit_1=LED,
+                                * Bit_2=Compression test mode enable */
+       pac207_write_reg(gspca_dev, 0x0f, 0x00); /* Power Control */
+       pac207_write_reg(gspca_dev, 0x11, 0x30); /* Analog Bias */
+
+       PDEBUG(D_PROBE,
+               "Pixart PAC207BCA Image Processor and Control Chip detected"
+               " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
+
+       cam = &gspca_dev->cam;
+       cam->dev_name = (char *) id->driver_info;
+       cam->epaddr = 0x05;
+       cam->cam_mode = sif_mode;
+       cam->nmodes = ARRAY_SIZE(sif_mode);
+
+       return 0;
+}
+
+/* this function is called at open time */
+static int sd_open(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       sd->brightness = PAC207_BRIGHTNESS_DEFAULT;
+       sd->exposure = PAC207_EXPOSURE_DEFAULT;
+       sd->gain = PAC207_GAIN_DEFAULT;
+       sd->autogain = 1;
+
+       return 0;
+}
+
+/* -- start the camera -- */
+static void sd_start(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       __u8 mode;
+
+       pac207_write_reg(gspca_dev, 0x0f, 0x10); /* Power control (Bit 6-0) */
+       pac207_write_regs(gspca_dev, 0x0002, pac207_sensor_init[0], 8);
+       pac207_write_regs(gspca_dev, 0x000a, pac207_sensor_init[1], 8);
+       pac207_write_regs(gspca_dev, 0x0012, pac207_sensor_init[2], 8);
+       pac207_write_regs(gspca_dev, 0x0040, pac207_sensor_init[3], 8);
+       pac207_write_regs(gspca_dev, 0x0042, pac207_sensor_init[4], 8);
+       pac207_write_regs(gspca_dev, 0x0048, PacReg72, 4);
+
+       /* Compression Balance */
+       if (gspca_dev->width == 176)
+               pac207_write_reg(gspca_dev, 0x4a, 0xff);
+       else
+               pac207_write_reg(gspca_dev, 0x4a, 0x88);
+       pac207_write_reg(gspca_dev, 0x4b, 0x00); /* Sram test value */
+       pac207_write_reg(gspca_dev, 0x08, sd->brightness);
+
+       /* PGA global gain (Bit 4-0) */
+       pac207_write_reg(gspca_dev, 0x0e, sd->gain);
+       pac207_write_reg(gspca_dev, 0x02, sd->exposure); /* PXCK = 12MHz /n */
+
+       mode = 0x02; /* Image Format (Bit 0), LED (1), Compr. test mode (2) */
+       if (gspca_dev->width == 176) { /* 176x144 */
+               mode |= 0x01;
+               PDEBUG(D_STREAM, "pac207_start mode 176x144");
+       } else/* 352x288 */
+               PDEBUG(D_STREAM, "pac207_start mode 352x288");
+       pac207_write_reg(gspca_dev, 0x41, mode);
+
+       pac207_write_reg(gspca_dev, 0x13, 0x01); /* Bit 0, auto clear */
+       pac207_write_reg(gspca_dev, 0x1c, 0x01); /* not documented */
+       udelay(1000); /* taken from gspca */
+       pac207_write_reg(gspca_dev, 0x40, 0x01); /* Start ISO pipe */
+
+       sd->sof_read = 0;
+       sd->autogain_ignore_frames = 0;
+       atomic_set(&sd->avg_lum, -1);
+}
+
+static void sd_stopN(struct gspca_dev *gspca_dev)
+{
+       pac207_write_reg(gspca_dev, 0x40, 0x00); /* Stop ISO pipe */
+       pac207_write_reg(gspca_dev, 0x41, 0x00); /* Turn of LED */
+       pac207_write_reg(gspca_dev, 0x0f, 0x00); /* Power Control */
+}
+
+static void sd_stop0(struct gspca_dev *gspca_dev)
+{
+}
+
+/* this function is called at close time */
+static void sd_close(struct gspca_dev *gspca_dev)
+{
+}
+
+/* -- convert pixart frames to Bayer -- */
+/* Sonix decompressor struct B.S.(2004) */
+static struct {
+       u8 is_abs;
+       u8 len;
+       s8 val;
+} table[256];
+
+void init_pixart_decoder(void)
+{
+       int i, is_abs, val, len;
+
+       for (i = 0; i < 256; i++) {
+               is_abs = 0;
+               val = 0;
+               len = 0;
+               if ((i & 0xC0) == 0) {
+                       /* code 00 */
+                       val = 0;
+                       len = 2;
+               } else if ((i & 0xC0) == 0x40) {
+                       /* code 01 */
+                       val = -5;
+                       len = 2;
+               } else if ((i & 0xC0) == 0x80) {
+                       /* code 10 */
+                       val = 5;
+                       len = 2;
+               } else if ((i & 0xF0) == 0xC0) {
+                       /* code 1100 */
+                       val = -10;
+                       len = 4;
+               } else if ((i & 0xF0) == 0xD0) {
+                       /* code 1101 */
+                       val = 10;
+                       len = 4;
+               } else if ((i & 0xF8) == 0xE0) {
+                       /* code 11100 */
+                       val = -15;
+                       len = 5;
+               } else if ((i & 0xF8) == 0xE8) {
+                       /* code 11101 */
+                       val = 15;
+                       len = 5;
+               } else if ((i & 0xFC) == 0xF0) {
+                       /* code 111100 */
+                       val = -20;
+                       len = 6;
+               } else if ((i & 0xFC) == 0xF4) {
+                       /* code 111101 */
+                       val = 20;
+                       len = 6;
+               } else if ((i & 0xF8) == 0xF8) {
+                       /* code 11111xxxxxx */
+                       is_abs = 1;
+                       val = 0;
+                       len = 5;
+               }
+               table[i].is_abs = is_abs;
+               table[i].val = val;
+               table[i].len = len;
+       }
+}
+
+/* auto gain and exposure algorithm based on the knee algorithm described here:
+   http://ytse.tricolour.net/docs/LowLightOptimization.html */
+static void pac207_do_auto_gain(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       int i, steps, desired_avg_lum;
+       int orig_gain = sd->gain;
+       int orig_exposure = sd->exposure;
+       int avg_lum = atomic_read(&sd->avg_lum);
+
+       if (!sd->autogain || avg_lum == -1)
+               return;
+
+       if (sd->autogain_ignore_frames > 0) {
+               sd->autogain_ignore_frames--;
+               return;
+       }
+
+       /* correct desired lumination for the configured brightness */
+       desired_avg_lum = 100 + sd->brightness / 2;
+
+       /* If we are of a multiple of deadzone, do multiple step to reach the
+          desired lumination fast (with the risc of a slight overshoot) */
+       steps = abs(desired_avg_lum - avg_lum) / PAC207_AUTOGAIN_DEADZONE;
+
+       for (i = 0; i < steps; i++) {
+               if (avg_lum > desired_avg_lum) {
+                       if (sd->gain > PAC207_GAIN_KNEE) {
+                               sd->gain--;
+                       } else if (sd->exposure > PAC207_EXPOSURE_KNEE) {
+                               sd->exposure--;
+                       } else if (sd->gain > PAC207_GAIN_DEFAULT) {
+                               sd->gain--;
+                       } else if (sd->exposure > PAC207_EXPOSURE_MIN) {
+                               sd->exposure--;
+                       } else if (sd->gain > PAC207_GAIN_MIN) {
+                               sd->gain--;
+                       } else
+                               break;
+               } else {
+                       if (sd->gain < PAC207_GAIN_DEFAULT) {
+                               sd->gain++;
+                       } else if (sd->exposure < PAC207_EXPOSURE_KNEE) {
+                               sd->exposure++;
+                       } else if (sd->gain < PAC207_GAIN_KNEE) {
+                               sd->gain++;
+                       } else if (sd->exposure < PAC207_EXPOSURE_MAX) {
+                               sd->exposure++;
+                       } else if (sd->gain < PAC207_GAIN_MAX) {
+                               sd->gain++;
+                       } else
+                               break;
+               }
+       }
+
+       if (sd->exposure != orig_exposure || sd->gain != orig_gain) {
+               if (sd->exposure != orig_exposure)
+                       pac207_write_reg(gspca_dev, 0x0002, sd->exposure);
+               if (sd->gain != orig_gain)
+                       pac207_write_reg(gspca_dev, 0x000e, sd->gain);
+               pac207_write_reg(gspca_dev, 0x13, 0x01); /* load reg to sen */
+               pac207_write_reg(gspca_dev, 0x1c, 0x01); /* not documented */
+               sd->autogain_ignore_frames = PAC207_AUTOGAIN_IGNORE_FRAMES;
+       }
+}
+
+static unsigned char *pac207_find_sof(struct gspca_dev *gspca_dev,
+       unsigned char *m, int len)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       int i;
+
+       /* Search for the SOF marker (fixed part) in the header */
+       for (i = 0; i < len; i++) {
+               if (m[i] == pac207_sof_marker[sd->sof_read]) {
+                       sd->sof_read++;
+                       if (sd->sof_read == sizeof(pac207_sof_marker)) {
+                               PDEBUG(D_STREAM,
+                                       "SOF found, bytes to analyze: %u."
+                                       " Frame starts at byte #%u",
+                                       len, i + 1);
+                               sd->sof_read = 0;
+                               return m + i + 1;
+                       }
+               } else
+                       sd->sof_read = 0;
+       }
+
+       return NULL;
+}
+
+static int pac207_decompress_row(struct gspca_dev *gspca_dev,
+       struct gspca_frame *f, unsigned char *cdata, int len)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       struct pac207_decoder_state *decoder_state = &sd->decoder_state;
+       unsigned char *outp = decoder_state->line_decode_buf +
+                               decoder_state->line_read;
+       int val, bitlen, bitpos = -decoder_state->no_remaining_bits;
+       u8 code;
+
+       /* first two pixels are stored as raw 8-bit */
+       while (decoder_state->line_read < 2) {
+               *outp++ = *cdata++;
+               decoder_state->line_read++;
+               len--;
+               if (len == 0)
+                       return 0;
+       }
+
+       while (decoder_state->line_read < gspca_dev->width) {
+               if (bitpos < 0) {
+                       code = decoder_state->remaining_bits << (8 + bitpos) |
+                               cdata[0] >> -bitpos;
+               } else {
+                       u8 *addr = cdata + bitpos / 8;
+                       code = addr[0] << (bitpos & 7) |
+                               addr[1] >> (8 - (bitpos & 7));
+               }
+
+               bitlen = decoder_state->get_abs ?
+                               6 : table[code].len;
+
+               /* Stop decompressing if we're out of input data */
+               if ((bitpos + bitlen) > (len * 8))
+                       break;
+
+               if (decoder_state->get_abs) {
+                       *outp++ = code & 0xFC;
+                       decoder_state->line_read++;
+                       decoder_state->get_abs = 0;
+               } else {
+                       if (table[code].is_abs)
+                               decoder_state->get_abs = 1;
+                       else {
+                               /* relative to left pixel */
+                               val = outp[-2] +
+                                       table[code].val;
+                               if (val > 0xff)
+                                       val = 0xff;
+                               else if (val < 0)
+                                       val = 0;
+                               *outp++ = val;
+                               decoder_state->line_read++;
+                       }
+               }
+               bitpos += bitlen;
+       }
+
+       if (decoder_state->line_read == gspca_dev->width) {
+               int compressed_line_len;
+
+               gspca_frame_add(gspca_dev, INTER_PACKET, f,
+                               decoder_state->line_decode_buf,
+                               gspca_dev->width);
+
+               /* completely decompressed line, round pos to nearest word */
+               compressed_line_len = ((decoder_state->processed_bytes * 8 +
+                       bitpos + 15) / 16) * 2;
+
+               len -= compressed_line_len - decoder_state->processed_bytes;
+               if (len < 0) {
+                       decoder_state->discard_byte = 1;
+                       len = 0;
+               }
+       } else {
+               decoder_state->processed_bytes += len;
+               decoder_state->remaining_bits = cdata[bitpos/8];
+               decoder_state->no_remaining_bits = (8 - bitpos) & 7;
+               len = 0;
+       }
+
+       return len;
+}
+
+static void pac207_decode_line_init(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       struct pac207_decoder_state *decoder_state = &sd->decoder_state;
+
+       decoder_state->line_read = 0;
+       decoder_state->line_state = LINE_HEADER1;
+       decoder_state->processed_bytes = 0;
+       decoder_state->no_remaining_bits = 0;
+       decoder_state->get_abs = 0;
+}
+
+static void pac207_decode_frame_init(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       struct pac207_decoder_state *decoder_state = &sd->decoder_state;
+
+       decoder_state->header_read = 0;
+       decoder_state->discard_byte = 0;
+
+       pac207_decode_line_init(gspca_dev);
+}
+
+static int pac207_decode_frame_data(struct gspca_dev *gspca_dev,
+       struct gspca_frame *f, unsigned char *data, int len)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+       struct pac207_decoder_state *decoder_state = &sd->decoder_state;
+       int needed = 0;
+
+       /* first 11 bytes after sof marker: frame header */
+       if (decoder_state->header_read < 11) {
+               /* get average lumination from frame header (byte 5) */
+               if (decoder_state->header_read < 5) {
+                       needed = 5 - decoder_state->header_read;
+                       if (len >= needed)
+                               atomic_set(&sd->avg_lum, data[needed-1]);
+               }
+               /* skip the rest of the header */
+               needed = 11 - decoder_state->header_read;
+               if (len <= needed) {
+                       decoder_state->header_read += len;
+                       return 0;
+               }
+               data += needed;
+               len -= needed;
+               decoder_state->header_read = 11;
+       }
+
+       while (len) {
+               if (decoder_state->discard_byte) {
+                       data++;
+                       len--;
+                       decoder_state->discard_byte = 0;
+                       continue;
+               }
+
+               switch (decoder_state->line_state) {
+               case LINE_HEADER1:
+                       decoder_state->line_marker = data[0] << 8;
+                       decoder_state->line_state = LINE_HEADER2;
+                       needed = 1;
+                       break;
+               case LINE_HEADER2:
+                       decoder_state->line_marker |= data[0];
+                       switch (decoder_state->line_marker) {
+                       case 0x0FF0:
+                               decoder_state->line_state = LINE_UNCOMPRESSED;
+                               break;
+                       case 0x1EE1:
+                               decoder_state->line_state = LINE_COMPRESSED;
+                               break;
+                       default:
+                               PDEBUG(D_STREAM,
+                                       "Error unknown line-header %04X",
+                                       (int) decoder_state->line_marker);
+                               gspca_dev->last_packet_type = DISCARD_PACKET;
+                               return 0;
+                       }
+                       needed = 1;
+                       break;
+               case LINE_UNCOMPRESSED:
+                       needed = gspca_dev->width - decoder_state->line_read;
+                       if (needed > len)
+                               needed = len;
+                       gspca_frame_add(gspca_dev, INTER_PACKET, f, data,
+                               needed);
+                       decoder_state->line_read += needed;
+                       break;
+               case LINE_COMPRESSED:
+                       needed = len -
+                               pac207_decompress_row(gspca_dev, f, data, len);
+                       break;
+               }
+
+               data += needed;
+               len -= needed;
+
+               if (decoder_state->line_read == gspca_dev->width) {
+                       if ((f->data_end - f->data) ==
+                               (gspca_dev->width * gspca_dev->height)) {
+                               /* eureka we've got a frame */
+                               return 1;
+                       }
+                       pac207_decode_line_init(gspca_dev);
+               }
+       }
+
+       return 0;
+}
+
+static void sd_pkt_scan(struct gspca_dev *gspca_dev,
+                       struct gspca_frame *frame,
+                       unsigned char *data,
+                       int len)
+{
+       unsigned char *sof;
+       int n;
+
+       sof = pac207_find_sof(gspca_dev, data, len);
+
+       if (sof) {
+               /* finish decoding current frame */
+               if (gspca_dev->last_packet_type == INTER_PACKET) {
+                       n = sof - data;
+                       if (n > sizeof(pac207_sof_marker))
+                               n -= sizeof(pac207_sof_marker);
+                       else
+                               n = 0;
+                       n = pac207_decode_frame_data(gspca_dev, frame,
+                                                       data, n);
+                       if (n)
+                               frame = gspca_frame_add(gspca_dev,
+                                               LAST_PACKET,
+                                               frame,
+                                               NULL,
+                                               0);
+                       else
+                               PDEBUG(D_STREAM, "Incomplete frame");
+               }
+               pac207_decode_frame_init(gspca_dev);
+               gspca_frame_add(gspca_dev, FIRST_PACKET, frame, NULL,
+                               0);
+               len -= sof - data;
+               data = sof;
+       }
+
+       if (gspca_dev->last_packet_type == DISCARD_PACKET)
+               return;
+
+       n = pac207_decode_frame_data(gspca_dev, frame, data, len);
+       if (n)
+               frame = gspca_frame_add(gspca_dev, LAST_PACKET,
+                                       frame, NULL, 0);
+}
+
+static void setbrightness(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       pac207_write_reg(gspca_dev, 0x08, sd->brightness);
+       pac207_write_reg(gspca_dev, 0x13, 0x01);        /* Bit 0, auto clear */
+       pac207_write_reg(gspca_dev, 0x1c, 0x01);        /* not documented */
+}
+
+static void setexposure(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       pac207_write_reg(gspca_dev, 0x02, sd->exposure);
+       pac207_write_reg(gspca_dev, 0x13, 0x01);        /* Bit 0, auto clear */
+       pac207_write_reg(gspca_dev, 0x1c, 0x01);        /* not documented */
+}
+
+static void setgain(struct gspca_dev *gspca_dev)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       pac207_write_reg(gspca_dev, 0x0e, sd->gain);
+       pac207_write_reg(gspca_dev, 0x13, 0x01);        /* Bit 0, auto clear */
+       pac207_write_reg(gspca_dev, 0x1c, 0x01);        /* not documented */
+}
+
+static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       sd->brightness = val;
+       if (gspca_dev->streaming)
+               setbrightness(gspca_dev);
+       return 0;
+}
+
+static int sd_getbrightness(struct gspca_dev *gspca_dev, __s32 *val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       *val = sd->brightness;
+       return 0;
+}
+
+static int sd_setexposure(struct gspca_dev *gspca_dev, __s32 val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       /* don't allow mucking with exposure when using autogain */
+       if (sd->autogain)
+               return -EINVAL;
+
+       sd->exposure = val;
+       if (gspca_dev->streaming)
+               setexposure(gspca_dev);
+       return 0;
+}
+
+static int sd_getexposure(struct gspca_dev *gspca_dev, __s32 *val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       *val = sd->exposure;
+       return 0;
+}
+
+static int sd_setgain(struct gspca_dev *gspca_dev, __s32 val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       /* don't allow mucking with gain when using autogain */
+       if (sd->autogain)
+               return -EINVAL;
+
+       sd->gain = val;
+       if (gspca_dev->streaming)
+               setgain(gspca_dev);
+       return 0;
+}
+
+static int sd_getgain(struct gspca_dev *gspca_dev, __s32 *val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       *val = sd->gain;
+       return 0;
+}
+
+static int sd_setautogain(struct gspca_dev *gspca_dev, __s32 val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       sd->autogain = val;
+       /* when switching to autogain set defaults to make sure
+          we are on a valid point of the autogain gain /
+          exposure knee graph, and give this change time to
+          take effect before doing autogain. */
+       if (sd->autogain) {
+               sd->exposure = PAC207_EXPOSURE_DEFAULT;
+               sd->gain = PAC207_GAIN_DEFAULT;
+               if (gspca_dev->streaming) {
+                       sd->autogain_ignore_frames =
+                               PAC207_AUTOGAIN_IGNORE_FRAMES;
+                       setexposure(gspca_dev);
+                       setgain(gspca_dev);
+               }
+       }
+
+       return 0;
+}
+
+static int sd_getautogain(struct gspca_dev *gspca_dev, __s32 *val)
+{
+       struct sd *sd = (struct sd *) gspca_dev;
+
+       *val = sd->autogain;
+       return 0;
+}
+
+/* sub-driver description */
+static struct sd_desc sd_desc = {
+       .name = MODULE_NAME,
+       .ctrls = sd_ctrls,
+       .nctrls = ARRAY_SIZE(sd_ctrls),
+       .config = sd_config,
+       .open = sd_open,
+       .start = sd_start,
+       .stopN = sd_stopN,
+       .stop0 = sd_stop0,
+       .close = sd_close,
+       .dq_callback = pac207_do_auto_gain,
+       .pkt_scan = sd_pkt_scan,
+};
+
+/* -- module initialisation -- */
+#define DVNM(name) .driver_info = (kernel_ulong_t) name
+static __devinitdata struct usb_device_id device_table[] = {
+       {USB_DEVICE(0x041e, 0x4028), DVNM("Creative Webcam Vista Plus")},
+       {USB_DEVICE(0x093a, 0x2460), DVNM("PAC207 Qtec Webcam 100")},
+       {USB_DEVICE(0x093a, 0x2463), DVNM("Philips spc200nc pac207")},
+       {USB_DEVICE(0x093a, 0x2464), DVNM("Labtec Webcam 1200")},
+       {USB_DEVICE(0x093a, 0x2468), DVNM("PAC207")},
+       {USB_DEVICE(0x093a, 0x2470), DVNM("Genius GF112")},
+       {USB_DEVICE(0x093a, 0x2471), DVNM("PAC207 Genius VideoCam ge111")},
+       {USB_DEVICE(0x093a, 0x2472), DVNM("PAC207 Genius VideoCam ge110")},
+       {USB_DEVICE(0x2001, 0xf115), DVNM("D-Link DSB-C120")},
+       {}
+};
+MODULE_DEVICE_TABLE(usb, device_table);
+
+/* -- device connect -- */
+static int sd_probe(struct usb_interface *intf,
+                       const struct usb_device_id *id)
+{
+       PDEBUG(D_PROBE, "camera probe");
+       return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd));
+}
+
+static struct usb_driver sd_driver = {
+       .name = MODULE_NAME,
+       .id_table = device_table,
+       .probe = sd_probe,
+       .disconnect = gspca_disconnect,
+};
+
+/* -- module insert / remove -- */
+static int __init sd_mod_init(void)
+{
+       init_pixart_decoder();
+       if (usb_register(&sd_driver) < 0)
+               return -1;
+       PDEBUG(D_PROBE, "v%s registered", version);
+       return 0;
+}
+static void __exit sd_mod_exit(void)
+{
+       usb_deregister(&sd_driver);
+       PDEBUG(D_PROBE, "deregistered");
+}
+
+module_init(sd_mod_init);
+module_exit(sd_mod_exit);