[media] staging: media: go7007: Adlink MPG24 board issues

This issuses applyed only for Adlink MPG24 board with go7007
 & wis2804, all whese changes was tested for continuos
 load&restart mode

This is minimal changes needed for start up go7007&wis2804 to work correctly
  in 3.4 branch

Changes:
  - When go7007 reset device, i2c was not worked (need rewrite GPIO5)
  - As wis2804 has i2c_addr=0x00/*really*/, so Need set I2C_CLIENT_TEN flag for validity
  - some main nonzero initialization, rewrites with kzalloc instead kmalloc
  - STATUS_SHUTDOWN was placed in incorrect place, so if firmware wasn`t loaded, we
    failed v4l2_device_unregister with kernel panic (OOPS)
  - some new v4l2 style features as call_all(...s_stream...) for using subdev calls
  - wis-tw2804.ko module code was incompatible with 3.4 branch in initialization v4l2_subdev parts.
    now i2c_get_clientdata(...) contains v4l2_subdev struct instead non standart wis_tw2804 struct

Adds:
  - Additional chipset tw2804 controls with: gain,auto gain,inputs[0,1],color kill,chroma gain,gain balances,
    for all 4 channels (from tw2804.pdf)
  - Power control for each 4 ADC (tw2804) up when s_stream(...,1), down otherwise

  Signed-off-by: Volokh Konstantin <volokh84@gmail.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

6 files changed, 407 insertions, 164 deletions

diff --git a/drivers/staging/media/go7007/README b/drivers/staging/media/go7007/README
index 48f447637817..082a6818c64e 100644
--- a/drivers/staging/media/go7007/README
+++ b/drivers/staging/media/go7007/README
@@ -5,6 +5,24 @@ Todo:
 	  and added to the build.
 	- testing?
 	- handle churn in v4l layer.
+	- Some features for wis-tw2804 subdev control (comb filter,motion detector sensitive & mask,more over...)
+	- go7007-v4l2.c need rewrite with new v4l2 style without nonstandart IO controls (set detector & bitrate)
+
+05/05/2012 3.4.0-rc+:
+Changes:
+  - When go7007 reset device, i2c was not worked (need rewrite GPIO5)
+  - As wis2804 has i2c_addr=0x00/*really*/, so Need set I2C_CLIENT_TEN flag for validity
+  - Some main nonzero initialization, rewrites with kzalloc instead kmalloc
+  - STATUS_SHUTDOWN was placed in incorrect place, so if firmware wasn`t loaded, we
+    failed v4l2_device_unregister with kernel panic (OOPS)
+  - Some new v4l2 style features as call_all(...s_stream...) for using subdev calls
+  - wis-tw2804.ko module code was incompatible with 3.4.x branch in initialization v4l2_subdev parts.
+    now i2c_get_clientdata(...) contains v4l2_subdev struct instead non standart wis_tw2804 struct
+
+Adds:
+  - Additional chipset wis2804 controls with: gain,auto gain,inputs[0,1],color kill,chroma gain,gain balances,
+    for all 4 channels (from tw2804.pdf)
+  - Power control for each 4 ADC up when s_stream(...,1), down otherwise in wis-tw2804 module
 
 Please send patchs to Greg Kroah-Hartman <greg@kroah.com> and Cc: Ross
 Cohen <rcohen@snurgle.org> as well.
diff --git a/drivers/staging/media/go7007/go7007-driver.c b/drivers/staging/media/go7007/go7007-driver.c
index ece2dd146487..2dff9b5906b9 100644
--- a/drivers/staging/media/go7007/go7007-driver.c
+++ b/drivers/staging/media/go7007/go7007-driver.c
@@ -173,6 +173,11 @@ static int go7007_init_encoder(struct go7007 *go)
 		go7007_write_addr(go, 0x3c82, 0x0001);
 		go7007_write_addr(go, 0x3c80, 0x00fe);
 	}
+	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
+		/* set GPIO5 to be an output, currently low */
+		go7007_write_addr(go, 0x3c82, 0x0000);
+		go7007_write_addr(go, 0x3c80, 0x00df);
+	}
 	return 0;
 }
 
@@ -192,17 +197,23 @@ int go7007_reset_encoder(struct go7007 *go)
 /*
  * Attempt to instantiate an I2C client by ID, probably loading a module.
  */
-static int init_i2c_module(struct i2c_adapter *adapter, const char *type,
-			   int addr)
+static int init_i2c_module(struct i2c_adapter *adapter, const struct go_i2c *const i2c)
 {
 	struct go7007 *go = i2c_get_adapdata(adapter);
 	struct v4l2_device *v4l2_dev = &go->v4l2_dev;
+	struct i2c_board_info info;
+
+	memset(&info, 0, sizeof(info));
+	strlcpy(info.type, i2c->type, sizeof(info.type));
+	info.addr = i2c->addr;
 
-	if (v4l2_i2c_new_subdev(v4l2_dev, adapter, type, addr, NULL))
+	if (i2c->id == I2C_DRIVERID_WIS_TW2804)
+		info.flags |= I2C_CLIENT_TEN;
+	if (v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, NULL))
 		return 0;
 
-	printk(KERN_INFO "go7007: probing for module i2c:%s failed\n", type);
-	return -1;
+	printk(KERN_INFO "go7007: probing for module i2c:%s failed\n", i2c->type);
+	return -EINVAL;
 }
 
 /*
@@ -238,9 +249,7 @@ int go7007_register_encoder(struct go7007 *go)
 	}
 	if (go->i2c_adapter_online) {
 		for (i = 0; i < go->board_info->num_i2c_devs; ++i)
-			init_i2c_module(&go->i2c_adapter,
-					go->board_info->i2c_devs[i].type,
-					go->board_info->i2c_devs[i].addr);
+			init_i2c_module(&go->i2c_adapter, &go->board_info->i2c_devs[i]);
 		if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)
 			i2c_clients_command(&go->i2c_adapter,
 				DECODER_SET_CHANNEL, &go->channel_number);
@@ -571,7 +580,7 @@ struct go7007 *go7007_alloc(struct go7007_board_info *board, struct device *dev)
 	struct go7007 *go;
 	int i;
 
-	go = kmalloc(sizeof(struct go7007), GFP_KERNEL);
+	go = kzalloc(sizeof(struct go7007), GFP_KERNEL);
 	if (go == NULL)
 		return NULL;
 	go->dev = dev;
diff --git a/drivers/staging/media/go7007/go7007-priv.h b/drivers/staging/media/go7007/go7007-priv.h
index b58c394c6555..b7b939a1967e 100644
--- a/drivers/staging/media/go7007/go7007-priv.h
+++ b/drivers/staging/media/go7007/go7007-priv.h
@@ -88,7 +88,7 @@ struct go7007_board_info {
 	int audio_bclk_div;
 	int audio_main_div;
 	int num_i2c_devs;
-	struct {
+	struct go_i2c {
 		const char *type;
 		int id;
 		int addr;
diff --git a/drivers/staging/media/go7007/go7007-usb.c b/drivers/staging/media/go7007/go7007-usb.c
index 5443e25086e9..9dbf5ecd05a2 100644
--- a/drivers/staging/media/go7007/go7007-usb.c
+++ b/drivers/staging/media/go7007/go7007-usb.c
@@ -1110,9 +1110,6 @@ static int go7007_usb_probe(struct usb_interface *intf,
 			} else {
 				u16 channel;
 
-				/* set GPIO5 to be an output, currently low */
-				go7007_write_addr(go, 0x3c82, 0x0000);
-				go7007_write_addr(go, 0x3c80, 0x00df);
 				/* read channel number from GPIO[1:0] */
 				go7007_read_addr(go, 0x3c81, &channel);
 				channel &= 0x3;
@@ -1245,7 +1242,6 @@ static void go7007_usb_disconnect(struct usb_interface *intf)
 	struct urb *vurb, *aurb;
 	int i;
 
-	go->status = STATUS_SHUTDOWN;
 	usb_kill_urb(usb->intr_urb);
 
 	/* Free USB-related structs */
@@ -1269,6 +1265,7 @@ static void go7007_usb_disconnect(struct usb_interface *intf)
 	kfree(go->hpi_context);
 
 	go7007_remove(go);
+	go->status = STATUS_SHUTDOWN;
 }
 
 static struct usb_driver go7007_usb_driver = {
diff --git a/drivers/staging/media/go7007/go7007-v4l2.c b/drivers/staging/media/go7007/go7007-v4l2.c
index c184ad30fbd8..b8f2eb6bc3ef 100644
--- a/drivers/staging/media/go7007/go7007-v4l2.c
+++ b/drivers/staging/media/go7007/go7007-v4l2.c
@@ -98,7 +98,7 @@ static int go7007_open(struct file *file)
 
 	if (go->status != STATUS_ONLINE)
 		return -EBUSY;
-	gofh = kmalloc(sizeof(struct go7007_file), GFP_KERNEL);
+	gofh = kzalloc(sizeof(struct go7007_file), GFP_KERNEL);
 	if (gofh == NULL)
 		return -ENOMEM;
 	++go->ref_count;
@@ -953,6 +953,7 @@ static int vidioc_streamon(struct file *file, void *priv,
 	}
 	mutex_unlock(&go->hw_lock);
 	mutex_unlock(&gofh->lock);
+	call_all(&go->v4l2_dev, video, s_stream, 1);
 
 	return retval;
 }
@@ -968,6 +969,7 @@ static int vidioc_streamoff(struct file *file, void *priv,
 	mutex_lock(&gofh->lock);
 	go7007_streamoff(go);
 	mutex_unlock(&gofh->lock);
+	call_all(&go->v4l2_dev, video, s_stream, 0);
 
 	return 0;
 }
@@ -1832,5 +1834,6 @@ void go7007_v4l2_remove(struct go7007 *go)
 	mutex_unlock(&go->hw_lock);
 	if (go->video_dev)
 		video_unregister_device(go->video_dev);
-	v4l2_device_unregister(&go->v4l2_dev);
+	if (go->status != STATUS_SHUTDOWN)
+		v4l2_device_unregister(&go->v4l2_dev);
 }
diff --git a/drivers/staging/media/go7007/wis-tw2804.c b/drivers/staging/media/go7007/wis-tw2804.c
index 9134f03e3cf0..9afc5df5902e 100644
--- a/drivers/staging/media/go7007/wis-tw2804.c
+++ b/drivers/staging/media/go7007/wis-tw2804.c
@@ -21,16 +21,27 @@
 #include <linux/videodev2.h>
 #include <linux/ioctl.h>
 #include <linux/slab.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-device.h>
 
 #include "wis-i2c.h"
 
 struct wis_tw2804 {
-	int channel;
+	struct v4l2_subdev sd;
+	u8 channel:2;
+	u8 input:1;
+	u8 update:1;
+	u8 auto_gain:1;
+	u8 ckil:1;
 	int norm;
-	int brightness;
-	int contrast;
-	int saturation;
-	int hue;
+	u8 brightness;
+	u8 contrast;
+	u8 saturation;
+	u8 hue;
+	u8 gain;
+	u8 cr_gain;
+	u8 r_balance;
+	u8 b_balance;
 };
 
 static u8 global_registers[] = {
@@ -41,6 +52,7 @@ static u8 global_registers[] = {
 	0x3d, 0x80,
 	0x3e, 0x82,
 	0x3f, 0x82,
+	0x78, 0x0f,
 	0xff, 0xff, /* Terminator (reg 0xff does not exist) */
 };
 
@@ -103,29 +115,358 @@ static u8 channel_registers[] = {
 	0xff, 0xff, /* Terminator (reg 0xff does not exist) */
 };
 
-static int write_reg(struct i2c_client *client, u8 reg, u8 value, int channel)
+static s32 write_reg(struct i2c_client *client, u8 reg, u8 value, u8 channel)
 {
 	return i2c_smbus_write_byte_data(client, reg | (channel << 6), value);
 }
 
-static int write_regs(struct i2c_client *client, u8 *regs, int channel)
+static int write_regs(struct i2c_client *client, u8 *regs, u8 channel)
 {
 	int i;
 
 	for (i = 0; regs[i] != 0xff; i += 2)
 		if (i2c_smbus_write_byte_data(client,
 				regs[i] | (channel << 6), regs[i + 1]) < 0)
-			return -1;
+			return -EINVAL;
 	return 0;
 }
 
+static s32 read_reg(struct i2c_client *client, u8 reg, u8 channel)
+{
+	return i2c_smbus_read_byte_data(client, (reg) | (channel << 6));
+}
+
+static inline struct wis_tw2804 *to_state(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct wis_tw2804, sd);
+}
+
+static int tw2804_log_status(struct v4l2_subdev *sd)
+{
+	struct wis_tw2804 *state = to_state(sd);
+	v4l2_info(sd, "Standard: %s\n", state->norm == V4L2_STD_NTSC ? "NTSC" :
+					state->norm == V4L2_STD_PAL ? "PAL" : "unknown");
+	v4l2_info(sd, "Channel: %d\n", state->channel);
+	v4l2_info(sd, "Input: %d\n", state->input);
+	v4l2_info(sd, "Brightness: %d\n", state->brightness);
+	v4l2_info(sd, "Contrast: %d\n", state->contrast);
+	v4l2_info(sd, "Saturation: %d\n", state->saturation);
+	v4l2_info(sd, "Hue: %d\n", state->hue);
+	return 0;
+}
+
+static int tw2804_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *query)
+{
+	static const u32 user_ctrls[] = {
+		V4L2_CID_USER_CLASS,
+		V4L2_CID_BRIGHTNESS,
+		V4L2_CID_CONTRAST,
+		V4L2_CID_SATURATION,
+		V4L2_CID_HUE,
+		V4L2_CID_AUTOGAIN,
+		V4L2_CID_COLOR_KILLER,
+		V4L2_CID_GAIN,
+		V4L2_CID_CHROMA_GAIN,
+		V4L2_CID_BLUE_BALANCE,
+		V4L2_CID_RED_BALANCE,
+		0
+	};
+
+	static const u32 *ctrl_classes[] = {
+		user_ctrls,
+		NULL
+	};
+
+	query->id = v4l2_ctrl_next(ctrl_classes, query->id);
+
+	switch (query->id) {
+	case V4L2_CID_USER_CLASS:
+		return v4l2_ctrl_query_fill(query, 0, 0, 0, 0);
+	case V4L2_CID_BRIGHTNESS:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 128);
+	case V4L2_CID_CONTRAST:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 128);
+	case V4L2_CID_SATURATION:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 128);
+	case V4L2_CID_HUE:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 128);
+	case V4L2_CID_AUTOGAIN:
+		return v4l2_ctrl_query_fill(query, 0, 1, 1, 0);
+	case V4L2_CID_COLOR_KILLER:
+		return v4l2_ctrl_query_fill(query, 0, 1, 1, 0);
+	case V4L2_CID_GAIN:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 128);
+	case V4L2_CID_CHROMA_GAIN:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 128);
+	case V4L2_CID_BLUE_BALANCE:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 122);
+	case V4L2_CID_RED_BALANCE:
+		return v4l2_ctrl_query_fill(query, 0, 255, 1, 122);
+	default:
+		return -EINVAL;
+	}
+}
+
+s32 get_ctrl_addr(int ctrl)
+{
+	switch (ctrl) {
+	case V4L2_CID_BRIGHTNESS:
+		return 0x12;
+	case V4L2_CID_CONTRAST:
+		return 0x11;
+	case V4L2_CID_SATURATION:
+		return 0x10;
+	case V4L2_CID_HUE:
+		return 0x0f;
+	case V4L2_CID_AUTOGAIN:
+		return 0x02;
+	case V4L2_CID_COLOR_KILLER:
+		return 0x14;
+	case V4L2_CID_GAIN:
+		return 0x3c;
+	case V4L2_CID_CHROMA_GAIN:
+		return 0x3d;
+	case V4L2_CID_RED_BALANCE:
+		return 0x3f;
+	case V4L2_CID_BLUE_BALANCE:
+		return 0x3e;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int tw2804_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+	struct wis_tw2804 *state = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	s32 addr = get_ctrl_addr(ctrl->id);
+	s32 val = 0;
+
+	if (addr == -EINVAL)
+		return -EINVAL;
+
+	if (state->update) {
+		val = read_reg(client, addr, ctrl->id == V4L2_CID_GAIN ||
+					ctrl->id == V4L2_CID_CHROMA_GAIN ||
+					ctrl->id == V4L2_CID_RED_BALANCE ||
+					ctrl->id == V4L2_CID_BLUE_BALANCE ? 0 : state->channel);
+		if (val < 0)
+			return val;
+	}
+
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		if (state->update)
+			state->brightness = val;
+		ctrl->value = state->brightness;
+		break;
+	case V4L2_CID_CONTRAST:
+		if (state->update)
+			state->contrast = val;
+		ctrl->value = state->contrast;
+		break;
+	case V4L2_CID_SATURATION:
+		if (state->update)
+			state->saturation = val;
+		ctrl->value = state->saturation;
+		break;
+	case V4L2_CID_HUE:
+		if (state->update)
+			state->hue = val;
+		ctrl->value = state->hue;
+		break;
+	case V4L2_CID_AUTOGAIN:
+		if (state->update)
+			state->auto_gain = val & (1<<7) ? 1 : 0;
+		ctrl->value = state->auto_gain;
+		break;
+	case V4L2_CID_COLOR_KILLER:
+		if (state->update)
+			state->ckil = (val & 0x03) == 0x03 ? 1 : 0;
+		ctrl->value = state->ckil;
+		break;
+	case V4L2_CID_GAIN:
+		if (state->update)
+			state->gain = val;
+		ctrl->value = state->gain;
+		break;
+	case V4L2_CID_CHROMA_GAIN:
+		if (state->update)
+			state->cr_gain = val;
+		ctrl->value = state->cr_gain;
+		break;
+	case V4L2_CID_RED_BALANCE:
+		if (state->update)
+			state->r_balance = val;
+		ctrl->value = state->r_balance;
+		break;
+	case V4L2_CID_BLUE_BALANCE:
+		if (state->update)
+			state->b_balance = val;
+		ctrl->value = state->b_balance;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	state->update = 0;
+	return 0;
+}
+
+static int tw2804_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+	struct wis_tw2804 *dec = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	s32 reg = 0;
+	s32 addr = get_ctrl_addr(ctrl->id);
+
+	if (addr == -EINVAL)
+		return -EINVAL;
+
+	switch (ctrl->id) {
+	case V4L2_CID_AUTOGAIN:
+		reg = read_reg(client, addr, dec->channel);
+		if (reg > 0) {
+			if (ctrl->value == 0)
+				ctrl->value = reg & ~(1<<7);
+			else
+				ctrl->value = reg | 1<<7;
+		} else
+			return reg;
+		break;
+	case V4L2_CID_COLOR_KILLER:
+		reg = read_reg(client, addr, dec->channel);
+		if (reg > 0)
+			ctrl->value = (reg & ~(0x03)) | (ctrl->value == 0 ? 0x02 : 0x03);
+		else
+			return reg;
+		break;
+	default:
+		break;
+	}
+
+	ctrl->value = ctrl->value > 255 ? 255 : (ctrl->value < 0 ? 0 : ctrl->value);
+	reg = write_reg(client, addr, (u8)ctrl->value, ctrl->id == V4L2_CID_GAIN ||
+						ctrl->id == V4L2_CID_CHROMA_GAIN ||
+						ctrl->id == V4L2_CID_RED_BALANCE ||
+						ctrl->id == V4L2_CID_BLUE_BALANCE ? 0 : dec->channel);
+
+	if (reg < 0) {
+		v4l2_err(&dec->sd, "Can`t set_ctrl value:id=%d;value=%d\n", ctrl->id, ctrl->value);
+		return reg;
+	}
+
+	dec->update = 1;
+	return tw2804_g_ctrl(sd, ctrl);
+}
+
+static int tw2804_s_std(struct v4l2_subdev *sd, v4l2_std_id norm)
+{
+	struct wis_tw2804 *dec = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	u8 regs[] = {
+		0x01, norm&V4L2_STD_NTSC ? 0xc4 : 0x84,
+		0x09, norm&V4L2_STD_NTSC ? 0x07 : 0x04,
+		0x0a, norm&V4L2_STD_NTSC ? 0xf0 : 0x20,
+		0x0b, norm&V4L2_STD_NTSC ? 0x07 : 0x04,
+		0x0c, norm&V4L2_STD_NTSC ? 0xf0 : 0x20,
+		0x0d, norm&V4L2_STD_NTSC ? 0x40 : 0x4a,
+		0x16, norm&V4L2_STD_NTSC ? 0x00 : 0x40,
+		0x17, norm&V4L2_STD_NTSC ? 0x00 : 0x40,
+		0x20, norm&V4L2_STD_NTSC ? 0x07 : 0x0f,
+		0x21, norm&V4L2_STD_NTSC ? 0x07 : 0x0f,
+		0xff, 0xff,
+	};
+	write_regs(client, regs, dec->channel);
+	dec->norm = norm;
+	return 0;
+}
+
+static const struct v4l2_subdev_core_ops tw2804_core_ops = {
+	.log_status = tw2804_log_status,
+	.g_ctrl = tw2804_g_ctrl,
+	.s_ctrl = tw2804_s_ctrl,
+	.queryctrl = tw2804_queryctrl,
+	.s_std = tw2804_s_std,
+};
+
+static int tw2804_s_video_routing(struct v4l2_subdev *sd, u32 input, u32 output,
+	u32 config)
+{
+	struct wis_tw2804 *dec = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	s32 reg = 0;
+
+	if (0 > input || input > 1)
+		return -EINVAL;
+
+	if (input == dec->input && !dec->update)
+		return 0;
+
+	reg = read_reg(client, 0x22, dec->channel);
+
+	if (reg >= 0) {
+		if (input == 0)
+			reg &= ~(1<<2);
+		else
+			reg |= 1<<2;
+		reg = write_reg(client, 0x22, (u8)reg, dec->channel);
+	}
+
+	if (reg >= 0) {
+		dec->input = input;
+		dec->update = 0;
+	} else
+		return reg;
+	return 0;
+}
+
+static int tw2804_s_mbus_fmt(struct v4l2_subdev *sd,
+	struct v4l2_mbus_framefmt *fmt)
+{
+	/*TODO need select between 3fmt:
+	 * bt_656,
+	 * bt_601_8bit,
+	 * bt_656_dual,
+	 */
+	return 0;
+}
+
+int tw2804_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct wis_tw2804 *dec = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	u32 reg = read_reg(client, 0x78, 0);
+
+	if (enable == 1)
+		write_reg(client, 0x78, reg & ~(1<<dec->channel), 0);
+	else
+		write_reg(client, 0x78, reg | (1<<dec->channel), 0);
+
+	return 0;
+}
+
+static const struct v4l2_subdev_video_ops tw2804_video_ops = {
+	.s_routing = tw2804_s_video_routing,
+	.s_mbus_fmt = tw2804_s_mbus_fmt,
+	.s_stream = tw2804_s_stream,
+};
+
+static const struct v4l2_subdev_ops tw2804_ops = {
+	.core = &tw2804_core_ops,
+	.video = &tw2804_video_ops,
+};
+
 static int wis_tw2804_command(struct i2c_client *client,
 				unsigned int cmd, void *arg)
 {
-	struct wis_tw2804 *dec = i2c_get_clientdata(client);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct wis_tw2804 *dec = to_state(sd);
+	int *input;
 
 	if (cmd == DECODER_SET_CHANNEL) {
-		int *input = arg;
+		input = arg;
 
 		if (*input < 0 || *input > 3) {
 			printk(KERN_ERR "wis-tw2804: channel %d is not "
@@ -154,139 +495,6 @@ static int wis_tw2804_command(struct i2c_client *client,
 				"channel number is set\n", cmd);
 		return 0;
 	}
-
-	switch (cmd) {
-	case VIDIOC_S_STD:
-	{
-		v4l2_std_id *input = arg;
-		u8 regs[] = {
-			0x01, *input & V4L2_STD_NTSC ? 0xc4 : 0x84,
-			0x09, *input & V4L2_STD_NTSC ? 0x07 : 0x04,
-			0x0a, *input & V4L2_STD_NTSC ? 0xf0 : 0x20,
-			0x0b, *input & V4L2_STD_NTSC ? 0x07 : 0x04,
-			0x0c, *input & V4L2_STD_NTSC ? 0xf0 : 0x20,
-			0x0d, *input & V4L2_STD_NTSC ? 0x40 : 0x4a,
-			0x16, *input & V4L2_STD_NTSC ? 0x00 : 0x40,
-			0x17, *input & V4L2_STD_NTSC ? 0x00 : 0x40,
-			0x20, *input & V4L2_STD_NTSC ? 0x07 : 0x0f,
-			0x21, *input & V4L2_STD_NTSC ? 0x07 : 0x0f,
-			0xff,	0xff,
-		};
-		write_regs(client, regs, dec->channel);
-		dec->norm = *input;
-		break;
-	}
-	case VIDIOC_QUERYCTRL:
-	{
-		struct v4l2_queryctrl *ctrl = arg;
-
-		switch (ctrl->id) {
-		case V4L2_CID_BRIGHTNESS:
-			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
-			strncpy(ctrl->name, "Brightness", sizeof(ctrl->name));
-			ctrl->minimum = 0;
-			ctrl->maximum = 255;
-			ctrl->step = 1;
-			ctrl->default_value = 128;
-			ctrl->flags = 0;
-			break;
-		case V4L2_CID_CONTRAST:
-			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
-			strncpy(ctrl->name, "Contrast", sizeof(ctrl->name));
-			ctrl->minimum = 0;
-			ctrl->maximum = 255;
-			ctrl->step = 1;
-			ctrl->default_value = 128;
-			ctrl->flags = 0;
-			break;
-		case V4L2_CID_SATURATION:
-			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
-			strncpy(ctrl->name, "Saturation", sizeof(ctrl->name));
-			ctrl->minimum = 0;
-			ctrl->maximum = 255;
-			ctrl->step = 1;
-			ctrl->default_value = 128;
-			ctrl->flags = 0;
-			break;
-		case V4L2_CID_HUE:
-			ctrl->type = V4L2_CTRL_TYPE_INTEGER;
-			strncpy(ctrl->name, "Hue", sizeof(ctrl->name));
-			ctrl->minimum = 0;
-			ctrl->maximum = 255;
-			ctrl->step = 1;
-			ctrl->default_value = 128;
-			ctrl->flags = 0;
-			break;
-		}
-		break;
-	}
-	case VIDIOC_S_CTRL:
-	{
-		struct v4l2_control *ctrl = arg;
-
-		switch (ctrl->id) {
-		case V4L2_CID_BRIGHTNESS:
-			if (ctrl->value > 255)
-				dec->brightness = 255;
-			else if (ctrl->value < 0)
-				dec->brightness = 0;
-			else
-				dec->brightness = ctrl->value;
-			write_reg(client, 0x12, dec->brightness, dec->channel);
-			break;
-		case V4L2_CID_CONTRAST:
-			if (ctrl->value > 255)
-				dec->contrast = 255;
-			else if (ctrl->value < 0)
-				dec->contrast = 0;
-			else
-				dec->contrast = ctrl->value;
-			write_reg(client, 0x11, dec->contrast, dec->channel);
-			break;
-		case V4L2_CID_SATURATION:
-			if (ctrl->value > 255)
-				dec->saturation = 255;
-			else if (ctrl->value < 0)
-				dec->saturation = 0;
-			else
-				dec->saturation = ctrl->value;
-			write_reg(client, 0x10, dec->saturation, dec->channel);
-			break;
-		case V4L2_CID_HUE:
-			if (ctrl->value > 255)
-				dec->hue = 255;
-			else if (ctrl->value < 0)
-				dec->hue = 0;
-			else
-				dec->hue = ctrl->value;
-			write_reg(client, 0x0f, dec->hue, dec->channel);
-			break;
-		}
-		break;
-	}
-	case VIDIOC_G_CTRL:
-	{
-		struct v4l2_control *ctrl = arg;
-
-		switch (ctrl->id) {
-		case V4L2_CID_BRIGHTNESS:
-			ctrl->value = dec->brightness;
-			break;
-		case V4L2_CID_CONTRAST:
-			ctrl->value = dec->contrast;
-			break;
-		case V4L2_CID_SATURATION:
-			ctrl->value = dec->saturation;
-			break;
-		case V4L2_CID_HUE:
-			ctrl->value = dec->hue;
-			break;
-		}
-		break;
-	}
-	default:
-		break;
-	}
 	return 0;
 }
 
@@ -295,21 +503,28 @@ static int wis_tw2804_probe(struct i2c_client *client,
 {
 	struct i2c_adapter *adapter = client->adapter;
 	struct wis_tw2804 *dec;
+	struct v4l2_subdev *sd;
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -ENODEV;
 
-	dec = kmalloc(sizeof(struct wis_tw2804), GFP_KERNEL);
+	dec = kzalloc(sizeof(struct wis_tw2804), GFP_KERNEL);
+
 	if (dec == NULL)
 		return -ENOMEM;
-
+	sd = &dec->sd;
+	dec->update = 1;
 	dec->channel = -1;
 	dec->norm = V4L2_STD_NTSC;
 	dec->brightness = 128;
 	dec->contrast = 128;
 	dec->saturation = 128;
 	dec->hue = 128;
-	i2c_set_clientdata(client, dec);
+	dec->gain = 128;
+	dec->cr_gain = 128;
+	dec->b_balance = 122;
+	dec->r_balance = 122;
+	v4l2_i2c_subdev_init(sd, client, &tw2804_ops);
 
 	printk(KERN_DEBUG "wis-tw2804: creating TW2804 at address %d on %s\n",
 		client->addr, adapter->name);
@@ -319,9 +534,10 @@ static int wis_tw2804_probe(struct i2c_client *client,
 
 static int wis_tw2804_remove(struct i2c_client *client)
 {
-	struct wis_tw2804 *dec = i2c_get_clientdata(client);
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 
-	kfree(dec);
+	v4l2_device_unregister_subdev(sd);
+	kfree(to_state(sd));
 	return 0;
 }