V4L/DVB (12082): gspca_stv06xx: Add support for st6422 bridge and sensor

Add support for st6422 bridge and sensor to the stv06xx gspca sub driver,
tested with:
Logitech QuickCam Messenger     046d:08f0       ST6422  integrated
Logitech QuickCam Mess. Plus    046d:08f6       ST6422  integrated
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/stv06xx/Makefile

@@ -3,7 +3,8 @@ obj-$(CONFIG_USB_STV06XX) += gspca_stv06xx.o
 gspca_stv06xx-objs := stv06xx.o \
 		      stv06xx_vv6410.o \
 		      stv06xx_hdcs.o \
-		      stv06xx_pb0100.o
+		      stv06xx_pb0100.o \
+		      stv06xx_st6422.o
 
 EXTRA_CFLAGS += -Idrivers/media/video/gspca
 

drivers/media/video/gspca/stv06xx/stv06xx.c

@@ -92,11 +92,10 @@ static int stv06xx_write_sensor_finish(struct sd *sd)
 {
 	int err = 0;
 
-	if (IS_850(sd)) {
+	if (sd->bridge == BRIDGE_STV610) {
 		struct usb_device *udev = sd->gspca_dev.dev;
 		__u8 *buf = sd->gspca_dev.usb_buf;
 
-		/* Quickam Web needs an extra packet */
 		buf[0] = 0;
 		err = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 				      0x04, 0x40, 0x1704, 0, buf, 1,
@@ -253,7 +252,7 @@ static int stv06xx_init(struct gspca_dev *gspca_dev)
 
 	err = sd->sensor->init(sd);
 
-	if (dump_sensor)
+	if (dump_sensor && sd->sensor->dump)
 		sd->sensor->dump(sd);
 
 	return (err < 0) ? err : 0;
@@ -318,6 +317,8 @@ static void stv06xx_pkt_scan(struct gspca_dev *gspca_dev,
 			__u8 *data,			/* isoc packet */
 			int len)			/* iso packet length */
 {
+	struct sd *sd = (struct sd *) gspca_dev;
+
 	PDEBUG(D_PACK, "Packet of length %d arrived", len);
 
 	/* A packet may contain several frames
@@ -343,14 +344,29 @@ static void stv06xx_pkt_scan(struct gspca_dev *gspca_dev,
 		if (len < chunk_len) {
 			PDEBUG(D_ERR, "URB packet length is smaller"
 				" than the specified chunk length");
+			gspca_dev->last_packet_type = DISCARD_PACKET;
 			return;
 		}
 
+		/* First byte seem to be 02=data 2nd byte is unknown??? */
+		if (sd->bridge == BRIDGE_ST6422 && (id & 0xFF00) == 0x0200)
+			goto frame_data;
+
 		switch (id) {
 		case 0x0200:
 		case 0x4200:
+frame_data:
 			PDEBUG(D_PACK, "Frame data packet detected");
 
+			if (sd->to_skip) {
+				int skip = (sd->to_skip < chunk_len) ?
+					    sd->to_skip : chunk_len;
+				data += skip;
+				len -= skip;
+				chunk_len -= skip;
+				sd->to_skip -= skip;
+			}
+
 			gspca_frame_add(gspca_dev, INTER_PACKET, frame,
 					data, chunk_len);
 			break;
@@ -365,6 +381,9 @@ static void stv06xx_pkt_scan(struct gspca_dev *gspca_dev,
 			gspca_frame_add(gspca_dev, FIRST_PACKET,
 					frame, data, 0);
 
+			if (sd->bridge == BRIDGE_ST6422)
+				sd->to_skip = gspca_dev->width * 4;
+
 			if (chunk_len)
 				PDEBUG(D_ERR, "Chunk length is "
 					      "non-zero on a SOF");
@@ -395,8 +414,12 @@ static void stv06xx_pkt_scan(struct gspca_dev *gspca_dev,
 			/* Unknown chunk with 2 bytes of data,
 			   occurs 2-3 times per USB interrupt */
 			break;
+		case 0x42ff:
+			PDEBUG(D_PACK, "Chunk 0x42ff detected");
+			/* Special chunk seen sometimes on the ST6422 */
+			break;
 		default:
-			PDEBUG(D_PACK, "Unknown chunk %d detected", id);
+			PDEBUG(D_PACK, "Unknown chunk 0x%04x detected", id);
 			/* Unknown chunk */
 		}
 		data    += chunk_len;
@@ -428,11 +451,16 @@ static int stv06xx_config(struct gspca_dev *gspca_dev,
 
 	cam = &gspca_dev->cam;
 	sd->desc = sd_desc;
+	sd->bridge = id->driver_info;
 	gspca_dev->sd_desc = &sd->desc;
 
 	if (dump_bridge)
 		stv06xx_dump_bridge(sd);
 
+	sd->sensor = &stv06xx_sensor_st6422;
+	if (!sd->sensor->probe(sd))
+		return 0;
+
 	sd->sensor = &stv06xx_sensor_vv6410;
 	if (!sd->sensor->probe(sd))
 		return 0;
@@ -457,9 +485,20 @@ static int stv06xx_config(struct gspca_dev *gspca_dev,
 
 /* -- module initialisation -- */
 static const __devinitdata struct usb_device_id device_table[] = {
-	{USB_DEVICE(0x046d, 0x0840)}, /* QuickCam Express */
-	{USB_DEVICE(0x046d, 0x0850)}, /* LEGO cam / QuickCam Web */
-	{USB_DEVICE(0x046d, 0x0870)}, /* Dexxa WebCam USB */
+	/* QuickCam Express */
+	{USB_DEVICE(0x046d, 0x0840), .driver_info = BRIDGE_STV600 },
+	/* LEGO cam / QuickCam Web */
+	{USB_DEVICE(0x046d, 0x0850), .driver_info = BRIDGE_STV610 },
+	/* Dexxa WebCam USB */
+	{USB_DEVICE(0x046d, 0x0870), .driver_info = BRIDGE_STV602 },
+	/* QuickCam Messenger */
+	{USB_DEVICE(0x046D, 0x08F0), .driver_info = BRIDGE_ST6422 },
+	/* QuickCam Communicate */
+	{USB_DEVICE(0x046D, 0x08F5), .driver_info = BRIDGE_ST6422 },
+	/* QuickCam Messenger (new) */
+	{USB_DEVICE(0x046D, 0x08F6), .driver_info = BRIDGE_ST6422 },
+	/* QuickCam Messenger (new) */
+	{USB_DEVICE(0x046D, 0x08DA), .driver_info = BRIDGE_ST6422 },
 	{}
 };
 MODULE_DEVICE_TABLE(usb, device_table);

drivers/media/video/gspca/stv06xx/stv06xx.h

@@ -93,6 +93,17 @@ struct sd {
 
 	/* Sensor private data */
 	void *sensor_priv;
+
+	/* The first 4 lines produced by the stv6422 are no good, this keeps
+	   track of how many bytes we still need to skip during a frame */
+	int to_skip;
+
+	/* Bridge / Camera type */
+	u8 bridge;
+	#define BRIDGE_STV600 0
+	#define BRIDGE_STV602 1
+	#define BRIDGE_STV610 2
+	#define BRIDGE_ST6422 3 /* With integrated sensor */
 };
 
 int stv06xx_write_bridge(struct sd *sd, u16 address, u16 i2c_data);

drivers/media/video/gspca/stv06xx/stv06xx_hdcs.c

@@ -434,7 +434,7 @@ static int hdcs_probe_1x00(struct sd *sd)
 	hdcs->exp.er = 100;
 
 	/*
-	 * Frame rate on HDCS-1000 0x46D:0x840 depends on PSMP:
+	 * Frame rate on HDCS-1000 with STV600 depends on PSMP:
 	 *  4 = doesn't work at all
 	 *  5 = 7.8 fps,
 	 *  6 = 6.9 fps,
@@ -443,7 +443,7 @@ static int hdcs_probe_1x00(struct sd *sd)
 	 * 15 = 4.4 fps,
 	 * 31 = 2.8 fps
 	 *
-	 * Frame rate on HDCS-1000 0x46D:0x870 depends on PSMP:
+	 * Frame rate on HDCS-1000 with STV602 depends on PSMP:
 	 * 15 = doesn't work at all
 	 * 18 = doesn't work at all
 	 * 19 = 7.3 fps
@@ -453,7 +453,7 @@ static int hdcs_probe_1x00(struct sd *sd)
 	 * 24 = 6.3 fps
 	 * 30 = 5.4 fps
 	 */
-	hdcs->psmp = IS_870(sd) ? 20 : 5;
+	hdcs->psmp = (sd->bridge == BRIDGE_STV602) ? 20 : 5;
 
 	sd->sensor_priv = hdcs;
 
@@ -530,7 +530,7 @@ static int hdcs_init(struct sd *sd)
 	int i, err = 0;
 
 	/* Set the STV0602AA in STV0600 emulation mode */
-	if (IS_870(sd))
+	if (sd->bridge == BRIDGE_STV602)
 		stv06xx_write_bridge(sd, STV_STV0600_EMULATION, 1);
 
 	/* Execute the bridge init */
@@ -558,7 +558,7 @@ static int hdcs_init(struct sd *sd)
 		return err;
 
 	/* Set PGA sample duration
-	(was 0x7E for IS_870, but caused slow framerate with HDCS-1020) */
+	(was 0x7E for the STV602, but caused slow framerate with HDCS-1020) */
 	if (IS_1020(sd))
 		err = stv06xx_write_sensor(sd, HDCS_TCTRL,
 				(HDCS_ADC_START_SIG_DUR << 6) | hdcs->psmp);

drivers/media/video/gspca/stv06xx/stv06xx_sensor.h

@@ -32,14 +32,13 @@
 
 #include "stv06xx.h"
 
-#define IS_850(sd)	((sd)->gspca_dev.dev->descriptor.idProduct == 0x850)
-#define IS_870(sd)	((sd)->gspca_dev.dev->descriptor.idProduct == 0x870)
 #define IS_1020(sd)	((sd)->sensor == &stv06xx_sensor_hdcs1020)
 
 extern const struct stv06xx_sensor stv06xx_sensor_vv6410;
 extern const struct stv06xx_sensor stv06xx_sensor_hdcs1x00;
 extern const struct stv06xx_sensor stv06xx_sensor_hdcs1020;
 extern const struct stv06xx_sensor stv06xx_sensor_pb0100;
+extern const struct stv06xx_sensor stv06xx_sensor_st6422;
 
 struct stv06xx_sensor {
 	/* Defines the name of a sensor */

drivers/media/video/gspca/stv06xx/stv06xx_st6422.c

+/*
+ * Support for the sensor part which is integrated (I think) into the
+ * st6422 stv06xx alike bridge, as its integrated there are no i2c writes
+ * but instead direct bridge writes.
+ *
+ * Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Strongly based on qc-usb-messenger, which is:
+ * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
+ *		      Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
+ * Copyright (c) 2002, 2003 Tuukka Toivonen
+ *
+ * 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 "stv06xx_st6422.h"
+
+static struct v4l2_pix_format st6422_mode[] = {
+	/* Note we actually get 124 lines of data, of which we skip the 4st
+	   4 as they are garbage */
+	{
+		162,
+		120,
+		V4L2_PIX_FMT_SGRBG8,
+		V4L2_FIELD_NONE,
+		.sizeimage = 162 * 120,
+		.bytesperline = 162,
+		.colorspace = V4L2_COLORSPACE_SRGB,
+		.priv = 1
+	},
+	/* Note we actually get 248 lines of data, of which we skip the 4st
+	   4 as they are garbage, and we tell the app it only gets the
+	   first 240 of the 244 lines it actually gets, so that it ignores
+	   the last 4. */
+	{
+		324,
+		240,
+		V4L2_PIX_FMT_SGRBG8,
+		V4L2_FIELD_NONE,
+		.sizeimage = 324 * 244,
+		.bytesperline = 324,
+		.colorspace = V4L2_COLORSPACE_SRGB,
+		.priv = 0
+	},
+};
+
+static const struct ctrl st6422_ctrl[] = {
+#define BRIGHTNESS_IDX 0
+	{
+		{
+			.id		= V4L2_CID_BRIGHTNESS,
+			.type		= V4L2_CTRL_TYPE_INTEGER,
+			.name		= "Brightness",
+			.minimum	= 0,
+			.maximum	= 31,
+			.step		= 1,
+			.default_value  = 3
+		},
+		.set = st6422_set_brightness,
+		.get = st6422_get_brightness
+	},
+#define CONTRAST_IDX 1
+	{
+		{
+			.id		= V4L2_CID_CONTRAST,
+			.type		= V4L2_CTRL_TYPE_INTEGER,
+			.name		= "Contrast",
+			.minimum	= 0,
+			.maximum	= 15,
+			.step		= 1,
+			.default_value  = 11
+		},
+		.set = st6422_set_contrast,
+		.get = st6422_get_contrast
+	},
+#define GAIN_IDX 2
+	{
+		{
+			.id		= V4L2_CID_GAIN,
+			.type		= V4L2_CTRL_TYPE_INTEGER,
+			.name		= "Gain",
+			.minimum	= 0,
+			.maximum	= 255,
+			.step		= 1,
+			.default_value  = 64
+		},
+		.set = st6422_set_gain,
+		.get = st6422_get_gain
+	},
+#define EXPOSURE_IDX 3
+	{
+		{
+			.id		= V4L2_CID_EXPOSURE,
+			.type		= V4L2_CTRL_TYPE_INTEGER,
+			.name		= "Exposure",
+			.minimum	= 0,
+			.maximum	= 1023,
+			.step		= 1,
+			.default_value  = 256
+		},
+		.set = st6422_set_exposure,
+		.get = st6422_get_exposure
+	},
+};
+
+static int st6422_probe(struct sd *sd)
+{
+	int i;
+	s32 *sensor_settings;
+
+	if (sd->bridge != BRIDGE_ST6422)
+		return -ENODEV;
+
+	info("st6422 sensor detected");
+
+	sensor_settings = kmalloc(ARRAY_SIZE(st6422_ctrl) * sizeof(s32),
+				  GFP_KERNEL);
+	if (!sensor_settings)
+		return -ENOMEM;
+
+	sd->gspca_dev.cam.cam_mode = st6422_mode;
+	sd->gspca_dev.cam.nmodes = ARRAY_SIZE(st6422_mode);
+	sd->desc.ctrls = st6422_ctrl;
+	sd->desc.nctrls = ARRAY_SIZE(st6422_ctrl);
+	sd->sensor_priv = sensor_settings;
+
+	for (i = 0; i < sd->desc.nctrls; i++)
+		sensor_settings[i] = st6422_ctrl[i].qctrl.default_value;
+
+	return 0;
+}
+
+static int st6422_init(struct sd *sd)
+{
+	int err = 0, i;
+
+	const u16 st6422_bridge_init[][2] = {
+		{ STV_ISO_ENABLE, 0x00 }, /* disable capture */
+		{ 0x1436, 0x00 },
+		{ 0x1432, 0x03 },	/* 0x00-0x1F brightness */
+		{ 0x143a, 0xF9 },	/* 0x00-0x0F contrast */
+		{ 0x0509, 0x38 },	/* R */
+		{ 0x050a, 0x38 },	/* G */
+		{ 0x050b, 0x38 },	/* B */
+		{ 0x050c, 0x2A },
+		{ 0x050d, 0x01 },
+
+
+		{ 0x1431, 0x00 },	/* 0x00-0x07 ??? */
+		{ 0x1433, 0x34 },	/* 160x120, 0x00-0x01 night filter */
+		{ 0x1438, 0x18 },	/* 640x480 */
+/* 18 bayes */
+/* 10 compressed? */
+
+		{ 0x1439, 0x00 },
+/* antiflimmer??  0xa2 ger perfekt bild mot monitor */
+
+		{ 0x143b, 0x05 },
+		{ 0x143c, 0x00 },	/* 0x00-0x01 - ??? */
+
+
+/* shutter time 0x0000-0x03FF */
+/* low value  give good picures on moving objects (but requires much light) */
+/* high value gives good picures in darkness (but tends to be overexposed) */
+		{ 0x143e, 0x01 },
+		{ 0x143d, 0x00 },
+
+		{ 0x1442, 0xe2 },
+/* write: 1x1x xxxx */
+/* read:  1x1x xxxx */
+/*        bit 5 == button pressed and hold if 0 */
+/* write 0xe2,0xea */
+
+/* 0x144a */
+/* 0x00 init */
+/* bit 7 == button has been pressed, but not handled */
+
+/* interrupt */
+/* if(urb->iso_frame_desc[i].status == 0x80) { */
+/* if(urb->iso_frame_desc[i].status == 0x88) { */
+
+		{ 0x1500, 0xd0 },
+		{ 0x1500, 0xd0 },
+		{ 0x1500, 0x50 },	/* 0x00 - 0xFF  0x80 == compr ? */
+
+		{ 0x1501, 0xaf },
+/* high val-> ljus area blir morkare. */
+/* low val -> ljus area blir ljusare. */
+		{ 0x1502, 0xc2 },
+/* high val-> ljus area blir morkare. */
+/* low val -> ljus area blir ljusare. */
+		{ 0x1503, 0x45 },
+/* high val-> ljus area blir morkare. */
+/* low val -> ljus area blir ljusare. */
+
+		{ 0x1505, 0x02 },
+/* 2  : 324x248  80352 bytes */
+/* 7  : 248x162  40176 bytes */
+/* c+f: 162*124  20088 bytes */
+
+		{ 0x150e, 0x8e },
+		{ 0x150f, 0x37 },
+		{ 0x15c0, 0x00 },
+		{ 0x15c1, 1023 }, /* 160x120, ISOC_PACKET_SIZE */
+		{ 0x15c3, 0x08 },	/* 0x04/0x14 ... test pictures ??? */
+
+
+		{ 0x143f, 0x01 },	/* commit settings */
+
+	};
+
+	for (i = 0; i < ARRAY_SIZE(st6422_bridge_init) && !err; i++) {
+		err = stv06xx_write_bridge(sd, st6422_bridge_init[i][0],
+					       st6422_bridge_init[i][1]);
+	}
+
+	return err;
+}
+
+static void st6422_disconnect(struct sd *sd)
+{
+	sd->sensor = NULL;
+	kfree(sd->sensor_priv);
+}
+
+static int st6422_start(struct sd *sd)
+{
+	int err, packet_size;
+	struct cam *cam = &sd->gspca_dev.cam;
+	s32 *sensor_settings = sd->sensor_priv;
+	struct usb_host_interface *alt;
+	struct usb_interface *intf;
+
+	intf = usb_ifnum_to_if(sd->gspca_dev.dev, sd->gspca_dev.iface);
+	alt = usb_altnum_to_altsetting(intf, sd->gspca_dev.alt);
+	if (!alt) {
+		PDEBUG(D_ERR, "Couldn't get altsetting");
+		return -EIO;
+	}
+
+	packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize);
+	err = stv06xx_write_bridge(sd, 0x15c1, packet_size);
+	if (err < 0)
+		return err;
+
+	if (cam->cam_mode[sd->gspca_dev.curr_mode].priv)
+		err = stv06xx_write_bridge(sd, 0x1505, 0x0f);
+	else
+		err = stv06xx_write_bridge(sd, 0x1505, 0x02);
+	if (err < 0)
+		return err;
+
+	err = st6422_set_brightness(&sd->gspca_dev,
+				    sensor_settings[BRIGHTNESS_IDX]);
+	if (err < 0)
+		return err;
+
+	err = st6422_set_contrast(&sd->gspca_dev,
+				  sensor_settings[CONTRAST_IDX]);
+	if (err < 0)
+		return err;
+
+	err = st6422_set_exposure(&sd->gspca_dev,
+				  sensor_settings[EXPOSURE_IDX]);
+	if (err < 0)
+		return err;
+
+	err = st6422_set_gain(&sd->gspca_dev,
+			      sensor_settings[GAIN_IDX]);
+	if (err < 0)
+		return err;
+
+	PDEBUG(D_STREAM, "Starting stream");
+
+	return 0;
+}
+
+static int st6422_stop(struct sd *sd)
+{
+	PDEBUG(D_STREAM, "Halting stream");
+
+	return 0;
+}
+
+static int st6422_get_brightness(struct gspca_dev *gspca_dev, __s32 *val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	*val = sensor_settings[BRIGHTNESS_IDX];
+
+	PDEBUG(D_V4L2, "Read brightness %d", *val);
+
+	return 0;
+}
+
+static int st6422_set_brightness(struct gspca_dev *gspca_dev, __s32 val)
+{
+	int err;
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	sensor_settings[BRIGHTNESS_IDX] = val;
+
+	if (!gspca_dev->streaming)
+		return 0;
+
+	/* val goes from 0 -> 31 */
+	PDEBUG(D_V4L2, "Set brightness to %d", val);
+	err = stv06xx_write_bridge(sd, 0x1432, val);
+	if (err < 0)
+		return err;
+
+	/* commit settings */
+	err = stv06xx_write_bridge(sd, 0x143f, 0x01);
+	return (err < 0) ? err : 0;
+}
+
+static int st6422_get_contrast(struct gspca_dev *gspca_dev, __s32 *val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	*val = sensor_settings[CONTRAST_IDX];
+
+	PDEBUG(D_V4L2, "Read contrast %d", *val);
+
+	return 0;
+}
+
+static int st6422_set_contrast(struct gspca_dev *gspca_dev, __s32 val)
+{
+	int err;
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	sensor_settings[CONTRAST_IDX] = val;
+
+	if (!gspca_dev->streaming)
+		return 0;
+
+	/* Val goes from 0 -> 15 */
+	PDEBUG(D_V4L2, "Set contrast to %d\n", val);
+	err = stv06xx_write_bridge(sd, 0x143a, 0xf0 | val);
+	if (err < 0)
+		return err;
+
+	/* commit settings */
+	err = stv06xx_write_bridge(sd, 0x143f, 0x01);
+	return (err < 0) ? err : 0;
+}
+
+static int st6422_get_gain(struct gspca_dev *gspca_dev, __s32 *val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	*val = sensor_settings[GAIN_IDX];
+
+	PDEBUG(D_V4L2, "Read gain %d", *val);
+
+	return 0;
+}
+
+static int st6422_set_gain(struct gspca_dev *gspca_dev, __s32 val)
+{
+	int err;
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	sensor_settings[GAIN_IDX] = val;
+
+	if (!gspca_dev->streaming)
+		return 0;
+
+	PDEBUG(D_V4L2, "Set gain to %d", val);
+
+	/* Set red, green, blue, gain */
+	err = stv06xx_write_bridge(sd, 0x0509, val);
+	if (err < 0)
+		return err;
+
+	err = stv06xx_write_bridge(sd, 0x050a, val);
+	if (err < 0)
+		return err;
+
+	err = stv06xx_write_bridge(sd, 0x050b, val);
+	if (err < 0)
+		return err;
+
+	/* 2 mystery writes */
+	err = stv06xx_write_bridge(sd, 0x050c, 0x2a);
+	if (err < 0)
+		return err;
+
+	err = stv06xx_write_bridge(sd, 0x050d, 0x01);
+	if (err < 0)
+		return err;
+
+	/* commit settings */
+	err = stv06xx_write_bridge(sd, 0x143f, 0x01);
+	return (err < 0) ? err : 0;
+}
+
+static int st6422_get_exposure(struct gspca_dev *gspca_dev, __s32 *val)
+{
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	*val = sensor_settings[EXPOSURE_IDX];
+
+	PDEBUG(D_V4L2, "Read exposure %d", *val);
+
+	return 0;
+}
+
+static int st6422_set_exposure(struct gspca_dev *gspca_dev, __s32 val)
+{
+	int err;
+	struct sd *sd = (struct sd *) gspca_dev;
+	s32 *sensor_settings = sd->sensor_priv;
+
+	sensor_settings[EXPOSURE_IDX] = val;
+
+	if (!gspca_dev->streaming)
+		return 0;
+
+	PDEBUG(D_V4L2, "Set exposure to %d\n", val);
+	err = stv06xx_write_bridge(sd, 0x143d, val & 0xff);
+	if (err < 0)
+		return err;
+
+	err = stv06xx_write_bridge(sd, 0x143e, val >> 8);
+	if (err < 0)
+		return err;
+
+	/* commit settings */
+	err = stv06xx_write_bridge(sd, 0x143f, 0x01);
+	return (err < 0) ? err : 0;
+}

drivers/media/video/gspca/stv06xx/stv06xx_st6422.h

+/*
+ * Support for the sensor part which is integrated (I think) into the
+ * st6422 stv06xx alike bridge, as its integrated there are no i2c writes
+ * but instead direct bridge writes.
+ *
+ * Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
+ *
+ * Strongly based on qc-usb-messenger, which is:
+ * Copyright (c) 2001 Jean-Fredric Clere, Nikolas Zimmermann, Georg Acher
+ *		      Mark Cave-Ayland, Carlo E Prelz, Dick Streefland
+ * Copyright (c) 2002, 2003 Tuukka Toivonen
+ *
+ * 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
+ *
+ */
+
+#ifndef STV06XX_ST6422_H_
+#define STV06XX_ST6422_H_
+
+#include "stv06xx_sensor.h"
+
+static int st6422_probe(struct sd *sd);
+static int st6422_start(struct sd *sd);
+static int st6422_init(struct sd *sd);
+static int st6422_stop(struct sd *sd);
+static void st6422_disconnect(struct sd *sd);
+
+/* V4L2 controls supported by the driver */
+static int st6422_get_brightness(struct gspca_dev *gspca_dev, __s32 *val);
+static int st6422_set_brightness(struct gspca_dev *gspca_dev, __s32 val);
+static int st6422_get_contrast(struct gspca_dev *gspca_dev, __s32 *val);
+static int st6422_set_contrast(struct gspca_dev *gspca_dev, __s32 val);
+static int st6422_get_gain(struct gspca_dev *gspca_dev, __s32 *val);
+static int st6422_set_gain(struct gspca_dev *gspca_dev, __s32 val);
+static int st6422_get_exposure(struct gspca_dev *gspca_dev, __s32 *val);
+static int st6422_set_exposure(struct gspca_dev *gspca_dev, __s32 val);
+
+const struct stv06xx_sensor stv06xx_sensor_st6422 = {
+	.name = "ST6422",
+	.init = st6422_init,
+	.probe = st6422_probe,
+	.start = st6422_start,
+	.stop = st6422_stop,
+	.disconnect = st6422_disconnect,
+};
+
+#endif