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>

1 files changed, 1120 insertions, 0 deletions

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");