V4L/DVB (4018): Usbvideo/quickcam_messenger driver v4l

Adds a usbvideo driver for the Logitech Quickcam Messenger USB webcam.

Signed-off-by: Jaya Kumar <jayakumar.video@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

4 files changed, 1259 insertions, 0 deletions

diff --git a/drivers/media/video/usbvideo/Kconfig b/drivers/media/video/usbvideo/Kconfig
index 39269a2c5635..59fb899f31f3 100644
--- a/drivers/media/video/usbvideo/Kconfig
+++ b/drivers/media/video/usbvideo/Kconfig
@@ -36,3 +36,15 @@ config USB_KONICAWC
 
           To compile this driver as a module, choose M here: the
           module will be called konicawc.
+
+config USB_QUICKCAM_MESSENGER
+        tristate "USB Logitech Quickcam Messenger"
+        depends on USB && VIDEO_DEV
+        select VIDEO_USBVIDEO
+        ---help---
+          Say Y or M here to enable support for the USB Logitech Quickcam
+          Messenger webcam.
+
+          To compile this driver as a module, choose M here: the
+          module will be called quickcam_messenger.
+
diff --git a/drivers/media/video/usbvideo/Makefile b/drivers/media/video/usbvideo/Makefile
index bb52eb8dc2f9..4a1b144bee4d 100644
--- a/drivers/media/video/usbvideo/Makefile
+++ b/drivers/media/video/usbvideo/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_VIDEO_USBVIDEO)    += usbvideo.o
 obj-$(CONFIG_USB_IBMCAM)        += ibmcam.o ultracam.o
 obj-$(CONFIG_USB_KONICAWC)      += konicawc.o
 obj-$(CONFIG_USB_VICAM)         += vicam.o
+obj-$(CONFIG_USB_QUICKCAM_MESSENGER)    += quickcam_messenger.o
diff --git a/drivers/media/video/usbvideo/quickcam_messenger.c b/drivers/media/video/usbvideo/quickcam_messenger.c
new file mode 100644
index 000000000000..8ad9f6af89af
--- /dev/null
+++ b/drivers/media/video/usbvideo/quickcam_messenger.c
@@ -0,0 +1,1120 @@
+/*
+ * Driver for Logitech Quickcam Messenger usb video camera
+ * Copyright (C) Jaya Kumar
+ *
+ * This work was sponsored by CIS(M) Sdn Bhd.
+ * History:
+ * 05/08/2006 - Jaya Kumar
+ * I wrote this based on the konicawc by Simon Evans.
+ * -
+ * Full credit for reverse engineering and creating an initial
+ * working linux driver for the VV6422 goes to the qce-ga project by
+ * Tuukka Toivonen, Jochen Hoenicke, Peter McConnell,
+ * Cristiano De Michele, Georg Acher, Jean-Frederic Clere as well as
+ * others.
+ * ---
+ * 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
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/usb_input.h>
+
+#include "usbvideo.h"
+#include "quickcam_messenger.h"
+
+/*
+ * Version Information
+ */
+
+#ifdef CONFIG_USB_DEBUG
+static int debug;
+#define DEBUG(n, format, arg...) \
+        if (n <= debug) {        \
+                printk(KERN_DEBUG __FILE__ ":%s(): " format "\n", __FUNCTION__ , ## arg); \
+        }
+#else
+#define DEBUG(n, arg...)
+static const int debug = 0;
+#endif
+
+#define DRIVER_VERSION "v0.01"
+#define DRIVER_DESC "Logitech Quickcam Messenger USB"
+
+#define USB_LOGITECH_VENDOR_ID  0x046D
+#define USB_QCM_PRODUCT_ID      0x08F0
+
+#define MAX_CAMERAS     1
+
+#define MAX_COLOUR      32768
+#define MAX_HUE         32768
+#define MAX_BRIGHTNESS  32768
+#define MAX_CONTRAST    32768
+#define MAX_WHITENESS   32768
+
+static int size = SIZE_320X240;
+static int colour = MAX_COLOUR;
+static int hue = MAX_HUE;
+static int brightness = MAX_BRIGHTNESS;
+static int contrast =   MAX_CONTRAST;
+static int whiteness =  MAX_WHITENESS;
+
+static struct usbvideo *cams;
+
+static struct usb_device_id qcm_table [] = {
+        { USB_DEVICE(USB_LOGITECH_VENDOR_ID, USB_QCM_PRODUCT_ID) },
+        { }
+};
+MODULE_DEVICE_TABLE(usb, qcm_table);
+
+#ifdef CONFIG_INPUT
+static void qcm_register_input(struct qcm *cam, struct usb_device *dev)
+{
+        struct input_dev *input_dev;
+
+        usb_make_path(dev, cam->input_physname, sizeof(cam->input_physname));
+        strncat(cam->input_physname, "/input0", sizeof(cam->input_physname));
+
+        cam->input = input_dev = input_allocate_device();
+        if (!input_dev) {
+                warn("insufficient mem for cam input device");
+                return;
+        }
+
+        input_dev->name = "QCM button";
+        input_dev->phys = cam->input_physname;
+        usb_to_input_id(dev, &input_dev->id);
+        input_dev->cdev.dev = &dev->dev;
+
+        input_dev->evbit[0] = BIT(EV_KEY);
+        input_dev->keybit[LONG(BTN_0)] = BIT(BTN_0);
+
+        input_dev->private = cam;
+
+        input_register_device(cam->input);
+}
+
+static void qcm_unregister_input(struct qcm *cam)
+{
+        if (cam->input) {
+                input_unregister_device(cam->input);
+                cam->input = NULL;
+        }
+}
+
+static void qcm_report_buttonstat(struct qcm *cam)
+{
+        if (cam->input) {
+                input_report_key(cam->input, BTN_0, cam->button_sts);
+                input_sync(cam->input);
+        }
+}
+
+static void qcm_int_irq(struct urb *urb, struct pt_regs *regs)
+{
+        int ret;
+        struct uvd *uvd = urb->context;
+        struct qcm *cam;
+
+        if (!CAMERA_IS_OPERATIONAL(uvd))
+                return;
+
+        if (!uvd->streaming)
+                return;
+
+        uvd->stats.urb_count++;
+
+        if (urb->status < 0)
+                uvd->stats.iso_err_count++;
+        else {
+                if (urb->actual_length > 0 ) {
+                        cam = (struct qcm *) uvd->user_data;
+                        if (cam->button_sts_buf == 0x88)
+                                cam->button_sts = 0x0;
+                        else if (cam->button_sts_buf == 0x80)
+                                cam->button_sts = 0x1;
+                        qcm_report_buttonstat(cam);
+                }
+        }
+
+        ret = usb_submit_urb(urb, GFP_ATOMIC);
+        if (ret < 0)
+                err("usb_submit_urb error (%d)", ret);
+}
+
+static int qcm_setup_input_int(struct qcm *cam, struct uvd *uvd)
+{
+        int errflag;
+        usb_fill_int_urb(cam->button_urb, uvd->dev,
+                        usb_rcvintpipe(uvd->dev, uvd->video_endp + 1),
+                        &cam->button_sts_buf,
+                        1,
+                        qcm_int_irq,
+                        uvd, 16);
+
+        errflag = usb_submit_urb(cam->button_urb, GFP_KERNEL);
+        if (errflag)
+                err ("usb_submit_int ret %d", errflag);
+        return errflag;
+}
+
+static void qcm_stop_int_data(struct qcm *cam)
+{
+        usb_kill_urb(cam->button_urb);
+}
+
+static int qcm_alloc_int_urb(struct qcm *cam)
+{
+        cam->button_urb = usb_alloc_urb(0, GFP_KERNEL);
+
+        if (!cam->button_urb)
+                return -ENOMEM;
+
+        return 0;
+}
+
+static void qcm_free_int(struct qcm *cam)
+{
+        if (cam->button_urb)
+                usb_free_urb(cam->button_urb);
+}
+#endif /* CONFIG_INPUT */
+
+static int qcm_stv_setb(struct usb_device *dev, u16 reg, u8 val)
+{
+        int ret;
+
+        /* we'll wait up to 3 slices but no more */
+        ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+                0x04, USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
+                reg, 0, &val, 1, 3*HZ);
+        return ret;
+}
+
+static int qcm_stv_setw(struct usb_device *dev, u16 reg, u16 val)
+{
+        int ret;
+
+        /* we'll wait up to 3 slices but no more */
+        ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+                0x04, USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_DEVICE,
+                reg, 0, &val, 2, 3*HZ);
+        return ret;
+}
+
+static int qcm_stv_getw(struct usb_device *dev, unsigned short reg,
+                                                        __le16 *val)
+{
+        int ret;
+
+        /* we'll wait up to 3 slices but no more */
+        ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
+                0x04, USB_TYPE_VENDOR | USB_DIR_IN | USB_RECIP_DEVICE,
+                reg, 0, val, 2, 3*HZ);
+        return ret;
+}
+
+static int qcm_camera_on(struct uvd *uvd)
+{
+        int ret;
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x01));
+        return 0;
+}
+
+static int qcm_camera_off(struct uvd *uvd)
+{
+        int ret;
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x00));
+        return 0;
+}
+
+static void qcm_hsv2rgb(u16 hue, u16 sat, u16 val, u16 *r, u16 *g, u16 *b)
+{
+        unsigned int segment, valsat;
+        signed int   h = (signed int) hue;
+        unsigned int s = (sat - 32768) * 2;     /* rescale */
+        unsigned int v = val;
+        unsigned int p;
+
+        /*
+        the registers controling gain are 8 bit of which
+        we affect only the last 4 bits with our gain.
+        we know that if saturation is 0, (unsaturated) then
+        we're grayscale (center axis of the colour cone) so
+        we set rgb=value. we use a formula obtained from
+        wikipedia to map the cone to the RGB plane. it's
+        as follows for the human value case of h=0..360,
+        s=0..1, v=0..1
+        h_i = h/60 % 6 , f = h/60 - h_i , p = v(1-s)
+        q = v(1 - f*s) , t = v(1 - (1-f)s)
+        h_i==0 => r=v , g=t, b=p
+        h_i==1 => r=q , g=v, b=p
+        h_i==2 => r=p , g=v, b=t
+        h_i==3 => r=p , g=q, b=v
+        h_i==4 => r=t , g=p, b=v
+        h_i==5 => r=v , g=p, b=q
+        the bottom side (the point) and the stuff just up
+        of that is black so we simplify those two cases.
+        */
+        if (sat < 32768) {
+                /* anything less than this is unsaturated */
+                *r = val;
+                *g = val;
+                *b = val;
+                return;
+        }
+        if (val <= (0xFFFF/8)) {
+                /* anything less than this is black */
+                *r = 0;
+                *g = 0;
+                *b = 0;
+                return;
+        }
+
+        /* the rest of this code is copying tukkat's
+        implementation of the hsv2rgb conversion as taken
+        from qc-usb-messenger code. the 10923 is 0xFFFF/6
+        to divide the cone into 6 sectors.  */
+
+        segment = (h + 10923) & 0xFFFF;
+        segment = segment*3 >> 16;              /* 0..2: 0=R, 1=G, 2=B */
+        hue -= segment * 21845;                 /* -10923..10923 */
+        h = hue;
+        h *= 3;
+        valsat = v*s >> 16;                     /* 0..65534 */
+        p = v - valsat;
+        if (h >= 0) {
+                unsigned int t = v - (valsat * (32769 - h) >> 15);
+                switch (segment) {
+                case 0: /* R-> */
+                        *r = v;
+                        *g = t;
+                        *b = p;
+                        break;
+                case 1: /* G-> */
+                        *r = p;
+                        *g = v;
+                        *b = t;
+                        break;
+                case 2: /* B-> */
+                        *r = t;
+                        *g = p;
+                        *b = v;
+                        break;
+                }
+        } else {
+                unsigned int q = v - (valsat * (32769 + h) >> 15);
+                switch (segment) {
+                case 0: /* ->R */
+                        *r = v;
+                        *g = p;
+                        *b = q;
+                        break;
+                case 1: /* ->G */
+                        *r = q;
+                        *g = v;
+                        *b = p;
+                        break;
+                case 2: /* ->B */
+                        *r = p;
+                        *g = q;
+                        *b = v;
+                        break;
+                }
+        }
+}
+
+static int qcm_sensor_set_gains(struct uvd *uvd, u16 hue,
+        u16 saturation, u16 value)
+{
+        int ret;
+        u16 r,g,b;
+
+        /* this code is based on qc-usb-messenger */
+        qcm_hsv2rgb(hue, saturation, value, &r, &g, &b);
+
+        r >>= 12;
+        g >>= 12;
+        b >>= 12;
+
+        /* min val is 8 */
+        r = max((u16) 8, r);
+        g = max((u16) 8, g);
+        b = max((u16) 8, b);
+
+        r |= 0x30;
+        g |= 0x30;
+        b |= 0x30;
+
+        /* set the r,g,b gain registers */
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x0509, r));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050A, g));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050B, b));
+
+        /* doing as qc-usb did */
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050C, 0x2A));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x050D, 0x01));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));
+
+        return 0;
+}
+
+static int qcm_sensor_set_exposure(struct uvd *uvd, int exposure)
+{
+        int ret;
+        int formedval;
+
+        /* calculation was from qc-usb-messenger driver */
+        formedval = ( exposure >> 12 );
+
+        /* max value for formedval is 14 */
+        formedval = min(formedval, 14);
+
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev,
+                        0x143A, 0xF0 | formedval));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));
+        return 0;
+}
+
+static int qcm_sensor_setlevels(struct uvd *uvd, int brightness, int contrast,
+                                        int hue, int colour)
+{
+        int ret;
+        /* brightness is exposure, contrast is gain, colour is saturation */
+        CHECK_RET(ret,
+                qcm_sensor_set_exposure(uvd, brightness));
+        CHECK_RET(ret, qcm_sensor_set_gains(uvd, hue, colour, contrast));
+
+        return 0;
+}
+
+static int qcm_sensor_setsize(struct uvd *uvd, u8 size)
+{
+        int ret;
+
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x1505, size));
+        return 0;
+}
+
+static int qcm_sensor_set_shutter(struct uvd *uvd, int whiteness)
+{
+        int ret;
+        /* some rescaling as done by the qc-usb-messenger code */
+        if (whiteness > 0xC000)
+                whiteness = 0xC000 + (whiteness & 0x3FFF)*8;
+
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143D,
+                                (whiteness >> 8) & 0xFF));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143E,
+                                (whiteness >> 16) & 0x03));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x143F, 0x01));
+
+        return 0;
+}
+
+static int qcm_sensor_init(struct uvd *uvd)
+{
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+        int ret;
+        int i;
+
+        for (i=0; i < sizeof(regval_table)/sizeof(regval_table[0]) ; i++) {
+                CHECK_RET(ret, qcm_stv_setb(uvd->dev,
+                                        regval_table[i].reg,
+                                        regval_table[i].val));
+        }
+
+        CHECK_RET(ret, qcm_stv_setw(uvd->dev, 0x15c1,
+                                cpu_to_le16(ISOC_PACKET_SIZE)));
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, 0x15c3, 0x08));
+        CHECK_RET(ret, ret = qcm_stv_setb(uvd->dev, 0x143f, 0x01));
+
+        CHECK_RET(ret, qcm_stv_setb(uvd->dev, STV_ISO_ENABLE, 0x00));
+
+        CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));
+
+        CHECK_RET(ret, qcm_sensor_setlevels(uvd, uvd->vpic.brightness,
+                        uvd->vpic.contrast, uvd->vpic.hue, uvd->vpic.colour));
+
+        CHECK_RET(ret, qcm_sensor_set_shutter(uvd, uvd->vpic.whiteness));
+        CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));
+
+        return 0;
+}
+
+static int qcm_set_camera_size(struct uvd *uvd)
+{
+        int ret;
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+
+        CHECK_RET(ret, qcm_sensor_setsize(uvd, camera_sizes[cam->size].cmd));
+        cam->width = camera_sizes[cam->size].width;
+        cam->height = camera_sizes[cam->size].height;
+        uvd->videosize = VIDEOSIZE(cam->width, cam->height);
+
+        return 0;
+}
+
+static int qcm_setup_on_open(struct uvd *uvd)
+{
+        int ret;
+
+        CHECK_RET(ret, qcm_sensor_set_gains(uvd, uvd->vpic.hue,
+                                uvd->vpic.colour, uvd->vpic.contrast));
+        CHECK_RET(ret, qcm_sensor_set_exposure(uvd, uvd->vpic.brightness));
+        CHECK_RET(ret, qcm_sensor_set_shutter(uvd, uvd->vpic.whiteness));
+        CHECK_RET(ret, qcm_set_camera_size(uvd));
+        CHECK_RET(ret, qcm_camera_on(uvd));
+        return 0;
+}
+
+static void qcm_adjust_picture(struct uvd *uvd)
+{
+        int ret;
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+
+        ret = qcm_camera_off(uvd);
+        if (ret) {
+                err("can't turn camera off. abandoning pic adjustment");
+                return;
+        }
+
+        /* if there's been a change in contrast, hue, or
+        colour then we need to recalculate hsv in order
+        to update gains */
+        if ((cam->contrast != uvd->vpic.contrast) ||
+                (cam->hue != uvd->vpic.hue) ||
+                (cam->colour != uvd->vpic.colour)) {
+                cam->contrast = uvd->vpic.contrast;
+                cam->hue = uvd->vpic.hue;
+                cam->colour = uvd->vpic.colour;
+                ret = qcm_sensor_set_gains(uvd, cam->hue, cam->colour,
+                                                cam->contrast);
+                if (ret) {
+                        err("can't set gains. abandoning pic adjustment");
+                        return;
+                }
+        }
+
+        if (cam->brightness != uvd->vpic.brightness) {
+                cam->brightness = uvd->vpic.brightness;
+                ret = qcm_sensor_set_exposure(uvd, cam->brightness);
+                if (ret) {
+                        err("can't set exposure. abandoning pic adjustment");
+                        return;
+                }
+        }
+
+        if (cam->whiteness != uvd->vpic.whiteness) {
+                cam->whiteness = uvd->vpic.whiteness;
+                qcm_sensor_set_shutter(uvd, cam->whiteness);
+                if (ret) {
+                        err("can't set shutter. abandoning pic adjustment");
+                        return;
+                }
+        }
+
+        ret = qcm_camera_on(uvd);
+        if (ret) {
+                err("can't reenable camera. pic adjustment failed");
+                return;
+        }
+}
+
+static int qcm_process_frame(struct uvd *uvd, u8 *cdata, int framelen)
+{
+        int datalen;
+        int totaldata;
+        struct framehdr {
+                __be16 id;
+                __be16 len;
+        };
+        struct framehdr *fhdr;
+
+        totaldata = 0;
+        while (framelen) {
+                fhdr = (struct framehdr *) cdata;
+                datalen = be16_to_cpu(fhdr->len);
+                framelen -= 4;
+                cdata += 4;
+
+                if ((fhdr->id) == cpu_to_be16(0x8001)) {
+                        RingQueue_Enqueue(&uvd->dp, marker, 4);
+                        totaldata += 4;
+                        continue;
+                }
+                if ((fhdr->id & cpu_to_be16(0xFF00)) == cpu_to_be16(0x0200)) {
+                        RingQueue_Enqueue(&uvd->dp, cdata, datalen);
+                        totaldata += datalen;
+                }
+                framelen -= datalen;
+                cdata += datalen;
+        }
+        return totaldata;
+}
+
+static int qcm_compress_iso(struct uvd *uvd, struct urb *dataurb)
+{
+        int totlen;
+        int i;
+        unsigned char *cdata;
+
+        totlen=0;
+        for (i = 0; i < dataurb->number_of_packets; i++) {
+                int n = dataurb->iso_frame_desc[i].actual_length;
+                int st = dataurb->iso_frame_desc[i].status;
+
+                cdata = dataurb->transfer_buffer +
+                        dataurb->iso_frame_desc[i].offset;
+
+                if (st < 0) {
+                        warn("Data error: packet=%d. len=%d. status=%d.",
+                              i, n, st);
+                        uvd->stats.iso_err_count++;
+                        continue;
+                }
+                if (!n)
+                        continue;
+
+                totlen += qcm_process_frame(uvd, cdata, n);
+        }
+        return totlen;
+}
+
+static void resubmit_urb(struct uvd *uvd, struct urb *urb)
+{
+        int ret;
+
+        urb->dev = uvd->dev;
+        ret = usb_submit_urb(urb, GFP_ATOMIC);
+        if (ret)
+                err("usb_submit_urb error (%d)", ret);
+}
+
+static void qcm_isoc_irq(struct urb *urb, struct pt_regs *regs)
+{
+        int len;
+        struct uvd *uvd = urb->context;
+
+        if (!CAMERA_IS_OPERATIONAL(uvd))
+                return;
+
+        if (!uvd->streaming)
+                return;
+
+        uvd->stats.urb_count++;
+
+        if (!urb->actual_length) {
+                resubmit_urb(uvd, urb);
+                return;
+        }
+
+        len = qcm_compress_iso(uvd, urb);
+        resubmit_urb(uvd, urb);
+        uvd->stats.urb_length = len;
+        uvd->stats.data_count += len;
+        if (len)
+                RingQueue_WakeUpInterruptible(&uvd->dp);
+}
+
+static int qcm_start_data(struct uvd *uvd)
+{
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+        int i;
+        int errflag;
+        int pktsz;
+        int err;
+
+        pktsz = uvd->iso_packet_len;
+        if (!CAMERA_IS_OPERATIONAL(uvd)) {
+                err("Camera is not operational");
+                return -EFAULT;
+        }
+
+        err = usb_set_interface(uvd->dev, uvd->iface, uvd->ifaceAltActive);
+        if (err < 0) {
+                err("usb_set_interface error");
+                uvd->last_error = err;
+                return -EBUSY;
+        }
+
+        for (i=0; i < USBVIDEO_NUMSBUF; i++) {
+                int j, k;
+                struct urb *urb = uvd->sbuf[i].urb;
+                urb->dev = uvd->dev;
+                urb->context = uvd;
+                urb->pipe = usb_rcvisocpipe(uvd->dev, uvd->video_endp);
+                urb->interval = 1;
+                urb->transfer_flags = URB_ISO_ASAP;
+                urb->transfer_buffer = uvd->sbuf[i].data;
+                urb->complete = qcm_isoc_irq;
+                urb->number_of_packets = FRAMES_PER_DESC;
+                urb->transfer_buffer_length = pktsz * FRAMES_PER_DESC;
+                for (j=k=0; j < FRAMES_PER_DESC; j++, k += pktsz) {
+                        urb->iso_frame_desc[j].offset = k;
+                        urb->iso_frame_desc[j].length = pktsz;
+                }
+        }
+
+        uvd->streaming = 1;
+        uvd->curframe = -1;
+        for (i=0; i < USBVIDEO_NUMSBUF; i++) {
+                errflag = usb_submit_urb(uvd->sbuf[i].urb, GFP_KERNEL);
+                if (errflag)
+                        err ("usb_submit_isoc(%d) ret %d", i, errflag);
+        }
+
+        CHECK_RET(err, qcm_setup_input_int(cam, uvd));
+        CHECK_RET(err, qcm_camera_on(uvd));
+        return 0;
+}
+
+static void qcm_stop_data(struct uvd *uvd)
+{
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+        int i, j;
+        int ret;
+
+        if ((uvd == NULL) || (!uvd->streaming) || (uvd->dev == NULL))
+                return;
+
+        ret = qcm_camera_off(uvd);
+        if (ret)
+                warn("couldn't turn the cam off.");
+
+        uvd->streaming = 0;
+
+        /* Unschedule all of the iso td's */
+        for (i=0; i < USBVIDEO_NUMSBUF; i++)
+                usb_kill_urb(uvd->sbuf[i].urb);
+
+        qcm_stop_int_data(cam);
+
+        if (!uvd->remove_pending) {
+                /* Set packet size to 0 */
+                j = usb_set_interface(uvd->dev, uvd->iface,
+                                        uvd->ifaceAltInactive);
+                if (j < 0) {
+                        err("usb_set_interface() error %d.", j);
+                        uvd->last_error = j;
+                }
+        }
+}
+
+static void qcm_process_isoc(struct uvd *uvd, struct usbvideo_frame *frame)
+{
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+        int x;
+        struct rgb *rgbL0;
+        struct rgb *rgbL1;
+        struct bayL0 *bayL0;
+        struct bayL1 *bayL1;
+        int hor,ver,hordel,verdel;
+        assert(frame != NULL);
+
+        switch (cam->size) {
+        case SIZE_160X120:
+                hor = 162; ver = 124; hordel = 1; verdel = 2;
+                break;
+        case SIZE_320X240:
+        default:
+                hor = 324; ver = 248; hordel = 2; verdel = 4;
+                break;
+        }
+
+        if (frame->scanstate == ScanState_Scanning) {
+                while (RingQueue_GetLength(&uvd->dp) >=
+                         4 + (hor*verdel + hordel)) {
+                        if ((RING_QUEUE_PEEK(&uvd->dp, 0) == 0x00) &&
+                            (RING_QUEUE_PEEK(&uvd->dp, 1) == 0xff) &&
+                            (RING_QUEUE_PEEK(&uvd->dp, 2) == 0x00) &&
+                            (RING_QUEUE_PEEK(&uvd->dp, 3) == 0xff)) {
+                                frame->curline = 0;
+                                frame->scanstate = ScanState_Lines;
+                                frame->frameState = FrameState_Grabbing;
+                                RING_QUEUE_DEQUEUE_BYTES(&uvd->dp, 4);
+                        /*
+                        * if we're starting, we need to discard the first
+                        * 4 lines of y bayer data
+                        * and the first 2 gr elements of x bayer data
+                        */
+                                RING_QUEUE_DEQUEUE_BYTES(&uvd->dp,
+                                                        (hor*verdel + hordel));
+                                break;
+                        }
+                        RING_QUEUE_DEQUEUE_BYTES(&uvd->dp, 1);
+                }
+        }
+
+        if (frame->scanstate == ScanState_Scanning)
+                return;
+
+        /* now we can start processing bayer data so long as we have at least
+        * 2 lines worth of data. this is the simplest demosaicing method that
+        * I could think of. I use each 2x2 bayer element without interpolation
+        * to generate 4 rgb pixels.
+        */
+        while ( frame->curline < cam->height &&
+                (RingQueue_GetLength(&uvd->dp) >= hor*2)) {
+                /* get 2 lines of bayer for demosaicing
+                 * into 2 lines of RGB */
+                RingQueue_Dequeue(&uvd->dp, cam->scratch, hor*2);
+                bayL0 = (struct bayL0 *) cam->scratch;
+                bayL1 = (struct bayL1 *) (cam->scratch + hor);
+                /* frame->curline is the rgb y line */
+                rgbL0 = (struct rgb *)
+                                ( frame->data + (cam->width*3*frame->curline));
+                /* w/2 because we're already doing 2 pixels */
+                rgbL1 = rgbL0 + (cam->width/2);
+
+                for (x=0; x < cam->width; x+=2) {
+                        rgbL0->r = bayL0->r;
+                        rgbL0->g = bayL0->g;
+                        rgbL0->b = bayL1->b;
+
+                        rgbL0->r2 = bayL0->r;
+                        rgbL0->g2 = bayL1->g;
+                        rgbL0->b2 = bayL1->b;
+
+                        rgbL1->r = bayL0->r;
+                        rgbL1->g = bayL1->g;
+                        rgbL1->b = bayL1->b;
+
+                        rgbL1->r2 = bayL0->r;
+                        rgbL1->g2 = bayL1->g;
+                        rgbL1->b2 = bayL1->b;
+
+                        rgbL0++;
+                        rgbL1++;
+
+                        bayL0++;
+                        bayL1++;
+                }
+
+                frame->seqRead_Length += cam->width*3*2;
+                frame->curline += 2;
+        }
+        /* See if we filled the frame */
+        if (frame->curline == cam->height) {
+                frame->frameState = FrameState_Done_Hold;
+                frame->curline = 0;
+                uvd->curframe = -1;
+                uvd->stats.frame_num++;
+        }
+}
+
+/* taken from konicawc */
+static int qcm_set_video_mode(struct uvd *uvd, struct video_window *vw)
+{
+        int ret;
+        int newsize;
+        int oldsize;
+        int x = vw->width;
+        int y = vw->height;
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+
+        if (x > 0 && y > 0) {
+                DEBUG(2, "trying to find size %d,%d", x, y);
+                for (newsize = 0; newsize <= MAX_FRAME_SIZE; newsize++) {
+                        if ((camera_sizes[newsize].width == x) &&
+                                (camera_sizes[newsize].height == y))
+                                break;
+                }
+        } else
+                newsize = cam->size;
+
+        if (newsize > MAX_FRAME_SIZE) {
+                DEBUG(1, "couldn't find size %d,%d", x, y);
+                return -EINVAL;
+        }
+
+        if (newsize == cam->size) {
+                DEBUG(1, "Nothing to do");
+                return 0;
+        }
+
+        qcm_stop_data(uvd);
+
+        if (cam->size != newsize) {
+                oldsize = cam->size;
+                cam->size = newsize;
+                ret = qcm_set_camera_size(uvd);
+                if (ret) {
+                        err("Couldn't set camera size, err=%d",ret);
+                        /* restore the original size */
+                        cam->size = oldsize;
+                        return ret;
+                }
+        }
+
+        /* Flush the input queue and clear any current frame in progress */
+
+        RingQueue_Flush(&uvd->dp);
+        if (uvd->curframe != -1) {
+                uvd->frame[uvd->curframe].curline = 0;
+                uvd->frame[uvd->curframe].seqRead_Length = 0;
+                uvd->frame[uvd->curframe].seqRead_Index = 0;
+        }
+
+        CHECK_RET(ret, qcm_start_data(uvd));
+        return 0;
+}
+
+static int qcm_configure_video(struct uvd *uvd)
+{
+        int ret;
+        memset(&uvd->vpic, 0, sizeof(uvd->vpic));
+        memset(&uvd->vpic_old, 0x55, sizeof(uvd->vpic_old));
+
+        uvd->vpic.colour = colour;
+        uvd->vpic.hue = hue;
+        uvd->vpic.brightness = brightness;
+        uvd->vpic.contrast = contrast;
+        uvd->vpic.whiteness = whiteness;
+        uvd->vpic.depth = 24;
+        uvd->vpic.palette = VIDEO_PALETTE_RGB24;
+
+        memset(&uvd->vcap, 0, sizeof(uvd->vcap));
+        strcpy(uvd->vcap.name, "QCM USB Camera");
+        uvd->vcap.type = VID_TYPE_CAPTURE;
+        uvd->vcap.channels = 1;
+        uvd->vcap.audios = 0;
+
+        uvd->vcap.minwidth = camera_sizes[SIZE_160X120].width;
+        uvd->vcap.minheight = camera_sizes[SIZE_160X120].height;
+        uvd->vcap.maxwidth = camera_sizes[SIZE_320X240].width;
+        uvd->vcap.maxheight = camera_sizes[SIZE_320X240].height;
+
+        memset(&uvd->vchan, 0, sizeof(uvd->vchan));
+        uvd->vchan.flags = 0 ;
+        uvd->vchan.tuners = 0;
+        uvd->vchan.channel = 0;
+        uvd->vchan.type = VIDEO_TYPE_CAMERA;
+        strcpy(uvd->vchan.name, "Camera");
+
+        CHECK_RET(ret, qcm_sensor_init(uvd));
+        return 0;
+}
+
+static int qcm_probe(struct usb_interface *intf,
+                        const struct usb_device_id *devid)
+{
+        int err;
+        struct uvd *uvd;
+        struct usb_device *dev = interface_to_usbdev(intf);
+        struct qcm *cam;
+        size_t buffer_size;
+        unsigned char video_ep;
+        struct usb_host_interface *interface;
+        struct usb_endpoint_descriptor *endpoint;
+        int i,j;
+        unsigned int ifacenum, ifacenum_inact=0;
+        __le16 sensor_id;
+
+        /* we don't support multiconfig cams */
+        if (dev->descriptor.bNumConfigurations != 1)
+                return -ENODEV;
+
+        /* first check for the video interface and not
+        * the audio interface */
+        interface = &intf->cur_altsetting[0];
+        if ((interface->desc.bInterfaceClass != USB_CLASS_VENDOR_SPEC)
+                || (interface->desc.bInterfaceSubClass !=
+                        USB_CLASS_VENDOR_SPEC))
+                return -ENODEV;
+
+        /*
+        walk through each endpoint in each setting in the interface
+        stop when we find the one that's an isochronous IN endpoint.
+        */
+        for (i=0; i < intf->num_altsetting; i++) {
+                interface = &intf->cur_altsetting[i];
+                ifacenum = interface->desc.bAlternateSetting;
+                /* walk the end points */
+                for (j=0; j < interface->desc.bNumEndpoints; j++) {
+                        endpoint = &interface->endpoint[j].desc;
+
+                        if ((endpoint->bEndpointAddress &
+                                USB_ENDPOINT_DIR_MASK) != USB_DIR_IN)
+                                continue; /* not input then not good */
+
+                        buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
+                        if (!buffer_size) {
+                                ifacenum_inact = ifacenum;
+                                continue; /* 0 pkt size is not what we want */
+                        }
+
+                        if ((endpoint->bmAttributes &
+                                USB_ENDPOINT_XFERTYPE_MASK) ==
+                                USB_ENDPOINT_XFER_ISOC) {
+                                video_ep = endpoint->bEndpointAddress;
+                                /* break out of the search */
+                                goto good_videoep;
+                        }
+                }
+        }
+        /* failed out since nothing useful was found */
+        err("No suitable endpoint was found\n");
+        return -ENODEV;
+
+good_videoep:
+        /* disable isochronous stream before doing anything else */
+        err = qcm_stv_setb(dev, STV_ISO_ENABLE, 0);
+        if (err < 0) {
+                err("Failed to disable sensor stream");
+                return -EIO;
+        }
+
+        /*
+        Check that this is the same unknown sensor that is known to work. This
+        sensor is suspected to be the ST VV6422C001. I'll check the same value
+        that the qc-usb driver checks. This value is probably not even the
+        sensor ID since it matches the USB dev ID. Oh well. If it doesn't
+        match, it's probably a diff sensor so exit and apologize.
+        */
+        err = qcm_stv_getw(dev, CMOS_SENSOR_IDREV, &sensor_id);
+        if (err < 0) {
+                err("Couldn't read sensor values. Err %d\n",err);
+                return err;
+        }
+        if (sensor_id != cpu_to_le16(0x08F0)) {
+                err("Sensor ID %x != %x. Unsupported. Sorry\n",
+                        le16_to_cpu(sensor_id), (0x08F0));
+                return -ENODEV;
+        }
+
+        uvd = usbvideo_AllocateDevice(cams);
+        if (!uvd)
+                return -ENOMEM;
+
+        cam = (struct qcm *) uvd->user_data;
+
+        /* buf for doing demosaicing */
+        cam->scratch = kmalloc(324*2, GFP_KERNEL);
+        if (!cam->scratch) /* uvd freed in dereg */
+                return -ENOMEM;
+
+        /* yes, if we fail after here, cam->scratch gets freed
+        by qcm_free_uvd */
+
+        err = qcm_alloc_int_urb(cam);
+        if (err < 0)
+                return err;
+
+        /* yes, if we fail after here, int urb gets freed
+        by qcm_free_uvd */
+
+        RESTRICT_TO_RANGE(size, SIZE_160X120, SIZE_320X240);
+        cam->width = camera_sizes[size].width;
+        cam->height = camera_sizes[size].height;
+        cam->size = size;
+
+        uvd->debug = debug;
+        uvd->flags = 0;
+        uvd->dev = dev;
+        uvd->iface = intf->altsetting->desc.bInterfaceNumber;
+        uvd->ifaceAltActive = ifacenum;
+        uvd->ifaceAltInactive = ifacenum_inact;
+        uvd->video_endp = video_ep;
+        uvd->iso_packet_len = buffer_size;
+        uvd->paletteBits = 1L << VIDEO_PALETTE_RGB24;
+        uvd->defaultPalette = VIDEO_PALETTE_RGB24;
+        uvd->canvas = VIDEOSIZE(320, 240);
+        uvd->videosize = VIDEOSIZE(cam->width, cam->height);
+        err = qcm_configure_video(uvd);
+        if (err) {
+                err("failed to configure video settings");
+                return err;
+        }
+
+        err = usbvideo_RegisterVideoDevice(uvd);
+        if (err) { /* the uvd gets freed in Deregister */
+                err("usbvideo_RegisterVideoDevice() failed.");
+                return err;
+        }
+
+        uvd->max_frame_size = (320 * 240 * 3);
+        qcm_register_input(cam, dev);
+        usb_set_intfdata(intf, uvd);
+        return 0;
+}
+
+static void qcm_free_uvd(struct uvd *uvd)
+{
+        struct qcm *cam = (struct qcm *) uvd->user_data;
+
+        kfree(cam->scratch);
+        qcm_unregister_input(cam);
+        qcm_free_int(cam);
+}
+
+static struct usbvideo_cb qcm_driver = {
+        .probe =                qcm_probe,
+        .setupOnOpen =          qcm_setup_on_open,
+        .processData =          qcm_process_isoc,
+        .setVideoMode =         qcm_set_video_mode,
+        .startDataPump =        qcm_start_data,
+        .stopDataPump =         qcm_stop_data,
+        .adjustPicture =        qcm_adjust_picture,
+        .userFree =             qcm_free_uvd
+};
+
+static int __init qcm_init(void)
+{
+        info(DRIVER_DESC " " DRIVER_VERSION);
+
+        return usbvideo_register(
+                &cams,
+                MAX_CAMERAS,
+                sizeof(struct qcm),
+                "QCM",
+                &qcm_driver,
+                THIS_MODULE,
+                qcm_table);
+}
+
+static void __exit qcm_exit(void)
+{
+        usbvideo_Deregister(&cams);
+}
+
+module_param(size, int, 0);
+MODULE_PARM_DESC(size, "Initial Size 0: 160x120 1: 320x240");
+module_param(colour, int, 0);
+MODULE_PARM_DESC(colour, "Initial colour");
+module_param(hue, int, 0);
+MODULE_PARM_DESC(hue, "Initial hue");
+module_param(brightness, int, 0);
+MODULE_PARM_DESC(brightness, "Initial brightness");
+module_param(contrast, int, 0);
+MODULE_PARM_DESC(contrast, "Initial contrast");
+module_param(whiteness, int, 0);
+MODULE_PARM_DESC(whiteness, "Initial whiteness");
+
+#ifdef CONFIG_USB_DEBUG
+module_param(debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug level: 0-9 (default=0)");
+#endif
+
+module_init(qcm_init);
+module_exit(qcm_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_DESCRIPTION("QCM USB Camera");
+MODULE_SUPPORTED_DEVICE("QCM USB Camera");
diff --git a/drivers/media/video/usbvideo/quickcam_messenger.h b/drivers/media/video/usbvideo/quickcam_messenger.h
new file mode 100644
index 000000000000..baab9c081b52
--- /dev/null
+++ b/drivers/media/video/usbvideo/quickcam_messenger.h
@@ -0,0 +1,126 @@
+#ifndef quickcam_messenger_h
+#define quickcam_messenger_h
+
+#ifndef CONFIG_INPUT
+/* if we're not using input we dummy out these functions */
+#define qcm_register_input(...)
+#define qcm_unregister_input(...)
+#define qcm_report_buttonstat(...)
+#define qcm_setup_input_int(...) 0
+#define qcm_stop_int_data(...)
+#define qcm_alloc_int_urb(...) 0
+#define qcm_free_int(...)
+#endif
+
+
+#define CHECK_RET(ret, expr) \
+        if ((ret = expr) < 0) return ret
+
+/* Control Registers for the STVV6422 ASIC
+ * - this define is taken from the qc-usb-messenger code
+ */
+#define STV_ISO_ENABLE          0x1440
+#define ISOC_PACKET_SIZE        1023
+
+/* Chip identification number including revision indicator */
+#define CMOS_SENSOR_IDREV       0xE00A
+
+struct rgb {
+        u8 b;
+        u8 g;
+        u8 r;
+        u8 b2;
+        u8 g2;
+        u8 r2;
+};
+
+struct bayL0 {
+#ifdef __BIG_ENDIAN
+        u8 r;
+        u8 g;
+#elif __LITTLE_ENDIAN
+        u8 g;
+        u8 r;
+#else
+#error not byte order defined
+#endif
+};
+
+struct bayL1 {
+#ifdef __BIG_ENDIAN
+        u8 g;
+        u8 b;
+#elif __LITTLE_ENDIAN
+        u8 b;
+        u8 g;
+#else
+#error not byte order defined
+#endif
+};
+
+struct cam_size {
+        u16     width;
+        u16     height;
+        u8      cmd;
+};
+
+static const struct cam_size camera_sizes[] = {
+        { 160, 120, 0xf },
+        { 320, 240, 0x2 },
+};
+
+enum frame_sizes {
+        SIZE_160X120    = 0,
+        SIZE_320X240    = 1,
+};
+
+#define MAX_FRAME_SIZE SIZE_320X240
+
+struct qcm {
+        u16 colour;
+        u16 hue;
+        u16 brightness;
+        u16 contrast;
+        u16 whiteness;
+
+        u8 size;
+        int height;
+        int width;
+        u8 *scratch;
+        struct urb *button_urb;
+        u8 button_sts;
+        u8 button_sts_buf;
+
+#ifdef CONFIG_INPUT
+        struct input_dev *input;
+        char input_physname[64];
+#endif
+};
+
+struct regval {
+        u16 reg;
+        u8 val;
+};
+/* this table is derived from the
+qc-usb-messenger code */
+static const struct regval regval_table[] = {
+        { STV_ISO_ENABLE, 0x00 },
+        { 0x1436, 0x00 }, { 0x1432, 0x03 },
+        { 0x143a, 0xF9 }, { 0x0509, 0x38 },
+        { 0x050a, 0x38 }, { 0x050b, 0x38 },
+        { 0x050c, 0x2A }, { 0x050d, 0x01 },
+        { 0x1431, 0x00 }, { 0x1433, 0x34 },
+        { 0x1438, 0x18 }, { 0x1439, 0x00 },
+        { 0x143b, 0x05 }, { 0x143c, 0x00 },
+        { 0x143e, 0x01 }, { 0x143d, 0x00 },
+        { 0x1442, 0xe2 }, { 0x1500, 0xd0 },
+        { 0x1500, 0xd0 }, { 0x1500, 0x50 },
+        { 0x1501, 0xaf }, { 0x1502, 0xc2 },
+        { 0x1503, 0x45 }, { 0x1505, 0x02 },
+        { 0x150e, 0x8e }, { 0x150f, 0x37 },
+        { 0x15c0, 0x00 },
+};
+
+static const unsigned char marker[] = { 0x00, 0xff, 0x00, 0xFF };
+
+#endif /* quickcam_messenger_h */