V4L/DVB (10719): bt819: convert to v4l2_subdev.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/bt819.c

@@ -29,15 +29,14 @@
  */
 
 #include <linux/module.h>
-#include <linux/delay.h>
 #include <linux/types.h>
 #include <linux/ioctl.h>
 #include <asm/uaccess.h>
 #include <linux/i2c.h>
 #include <linux/i2c-id.h>
-#include <linux/videodev.h>
-#include <linux/video_decoder.h>
-#include <media/v4l2-common.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
 #include <media/v4l2-i2c-drv-legacy.h>
 
 MODULE_DESCRIPTION("Brooktree-819 video decoder driver");
@@ -48,13 +47,18 @@ static int debug;
 module_param(debug, int, 0);
 MODULE_PARM_DESC(debug, "Debug level (0-1)");
 
+static unsigned short normal_i2c[] = { 0x8a >> 1, I2C_CLIENT_END };
+
+I2C_CLIENT_INSMOD;
+
 /* ----------------------------------------------------------------------- */
 
 struct bt819 {
+	struct v4l2_subdev sd;
 	unsigned char reg[32];
 
-	int initialized;
 	v4l2_std_id norm;
+	int ident;
 	int input;
 	int enable;
 	int bright;
@@ -63,6 +67,11 @@ struct bt819 {
 	int sat;
 };
 
+static inline struct bt819 *to_bt819(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct bt819, sd);
+}
+
 struct timing {
 	int hactive;
 	int hdelay;
@@ -80,24 +89,23 @@ static struct timing timing_data[] = {
 
 /* ----------------------------------------------------------------------- */
 
-static inline int bt819_write(struct i2c_client *client, u8 reg, u8 value)
+static inline int bt819_write(struct bt819 *decoder, u8 reg, u8 value)
 {
-	struct bt819 *decoder = i2c_get_clientdata(client);
+	struct i2c_client *client = v4l2_get_subdevdata(&decoder->sd);
 
 	decoder->reg[reg] = value;
 	return i2c_smbus_write_byte_data(client, reg, value);
 }
 
-static inline int bt819_setbit(struct i2c_client *client, u8 reg, u8 bit, u8 value)
+static inline int bt819_setbit(struct bt819 *decoder, u8 reg, u8 bit, u8 value)
 {
-	struct bt819 *decoder = i2c_get_clientdata(client);
-
-	return bt819_write(client, reg,
+	return bt819_write(decoder, reg,
 		(decoder->reg[reg] & ~(1 << bit)) | (value ? (1 << bit) : 0));
 }
 
-static int bt819_write_block(struct i2c_client *client, const u8 *data, unsigned int len)
+static int bt819_write_block(struct bt819 *decoder, const u8 *data, unsigned int len)
 {
+	struct i2c_client *client = v4l2_get_subdevdata(&decoder->sd);
 	int ret = -1;
 	u8 reg;
 
@@ -105,7 +113,6 @@ static int bt819_write_block(struct i2c_client *client, const u8 *data, unsigned
 	 * the adapter understands raw I2C */
 	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		/* do raw I2C, not smbus compatible */
-		struct bt819 *decoder = i2c_get_clientdata(client);
 		u8 block_data[32];
 		int block_len;
 
@@ -126,7 +133,8 @@ static int bt819_write_block(struct i2c_client *client, const u8 *data, unsigned
 		/* do some slow I2C emulation kind of thing */
 		while (len >= 2) {
 			reg = *data++;
-			if ((ret = bt819_write(client, reg, *data++)) < 0)
+			ret = bt819_write(decoder, reg, *data++);
+			if (ret < 0)
 				break;
 			len -= 2;
 		}
@@ -135,15 +143,15 @@ static int bt819_write_block(struct i2c_client *client, const u8 *data, unsigned
 	return ret;
 }
 
-static inline int bt819_read(struct i2c_client *client, u8 reg)
+static inline int bt819_read(struct bt819 *decoder, u8 reg)
 {
+	struct i2c_client *client = v4l2_get_subdevdata(&decoder->sd);
+
 	return i2c_smbus_read_byte_data(client, reg);
 }
 
-static int bt819_init(struct i2c_client *client)
+static int bt819_init(struct v4l2_subdev *sd)
 {
-	struct bt819 *decoder = i2c_get_clientdata(client);
-
 	static unsigned char init[] = {
 		/*0x1f, 0x00,*/     /* Reset */
 		0x01, 0x59,	/* 0x01 input format */
@@ -178,6 +186,7 @@ static int bt819_init(struct i2c_client *client)
 		0x1a, 0x80,	/* 0x1a ADC Interface */
 	};
 
+	struct bt819 *decoder = to_bt819(sd);
 	struct timing *timing = &timing_data[(decoder->norm & V4L2_STD_525_60) ? 1 : 0];
 
 	init[0x03 * 2 - 1] =
@@ -194,277 +203,297 @@ static int bt819_init(struct i2c_client *client)
 	/* 0x15 in array is address 0x19 */
 	init[0x15 * 2 - 1] = (decoder->norm & V4L2_STD_625_50) ? 115 : 93;	/* Chroma burst delay */
 	/* reset */
-	bt819_write(client, 0x1f, 0x00);
+	bt819_write(decoder, 0x1f, 0x00);
 	mdelay(1);
 
 	/* init */
-	return bt819_write_block(client, init, sizeof(init));
+	return bt819_write_block(decoder, init, sizeof(init));
 }
 
 /* ----------------------------------------------------------------------- */
 
-static int bt819_command(struct i2c_client *client, unsigned cmd, void *arg)
+static int bt819_status(struct v4l2_subdev *sd, u32 *pstatus, v4l2_std_id *pstd)
 {
-	int temp;
+	struct bt819 *decoder = to_bt819(sd);
+	int status = bt819_read(decoder, 0x00);
+	int res = V4L2_IN_ST_NO_SIGNAL;
+	v4l2_std_id std;
+
+	if ((status & 0x80))
+		res = 0;
+
+	if ((status & 0x10))
+		std = V4L2_STD_PAL;
+	else
+		std = V4L2_STD_NTSC;
+	if (pstd)
+		*pstd = std;
+	if (pstatus)
+		*pstatus = status;
+
+	v4l2_dbg(1, debug, sd, "get status %x\n", status);
+	return 0;
+}
 
-	struct bt819 *decoder = i2c_get_clientdata(client);
+static int bt819_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
+{
+	return bt819_status(sd, NULL, std);
+}
 
-	if (!decoder->initialized) {	/* First call to bt819_init could be */
-		bt819_init(client);	/* without #FRST = 0 */
-		decoder->initialized = 1;
+static int bt819_g_input_status(struct v4l2_subdev *sd, u32 *status)
+{
+	return bt819_status(sd, status, NULL);
+}
+
+static int bt819_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
+{
+	struct bt819 *decoder = to_bt819(sd);
+	struct timing *timing = NULL;
+
+	v4l2_dbg(1, debug, sd, "set norm %llx\n", std);
+
+	if (std & V4L2_STD_NTSC) {
+		bt819_setbit(decoder, 0x01, 0, 1);
+		bt819_setbit(decoder, 0x01, 1, 0);
+		bt819_setbit(decoder, 0x01, 5, 0);
+		bt819_write(decoder, 0x18, 0x68);
+		bt819_write(decoder, 0x19, 0x5d);
+		/* bt819_setbit(decoder, 0x1a,  5, 1); */
+		timing = &timing_data[1];
+	} else if (std & V4L2_STD_PAL) {
+		bt819_setbit(decoder, 0x01, 0, 1);
+		bt819_setbit(decoder, 0x01, 1, 1);
+		bt819_setbit(decoder, 0x01, 5, 1);
+		bt819_write(decoder, 0x18, 0x7f);
+		bt819_write(decoder, 0x19, 0x72);
+		/* bt819_setbit(decoder, 0x1a,  5, 0); */
+		timing = &timing_data[0];
+	} else {
+		v4l2_dbg(1, debug, sd, "unsupported norm %llx\n", std);
+		return -EINVAL;
 	}
+	bt819_write(decoder, 0x03,
+			(((timing->vdelay >> 8) & 0x03) << 6) |
+			(((timing->vactive >> 8) & 0x03) << 4) |
+			(((timing->hdelay >> 8) & 0x03) << 2) |
+			((timing->hactive >> 8) & 0x03));
+	bt819_write(decoder, 0x04, timing->vdelay & 0xff);
+	bt819_write(decoder, 0x05, timing->vactive & 0xff);
+	bt819_write(decoder, 0x06, timing->hdelay & 0xff);
+	bt819_write(decoder, 0x07, timing->hactive & 0xff);
+	bt819_write(decoder, 0x08, (timing->hscale >> 8) & 0xff);
+	bt819_write(decoder, 0x09, timing->hscale & 0xff);
+	decoder->norm = std;
+	return 0;
+}
 
-	switch (cmd) {
-	case VIDIOC_INT_INIT:
-		/* This is just for testing!!! */
-		bt819_init(client);
-		break;
+static int bt819_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
+{
+	struct bt819 *decoder = to_bt819(sd);
 
-	case VIDIOC_QUERYSTD:
-	case VIDIOC_INT_G_INPUT_STATUS: {
-		int *iarg = arg;
-		v4l2_std_id *istd = arg;
-		int status;
-		int res = V4L2_IN_ST_NO_SIGNAL;
-		v4l2_std_id std;
-
-		status = bt819_read(client, 0x00);
-		if ((status & 0x80))
-			res = 0;
-
-		if ((status & 0x10))
-			std = V4L2_STD_PAL;
-		else
-			std = V4L2_STD_NTSC;
-		if (cmd == VIDIOC_QUERYSTD)
-			*istd = std;
-		else
-			*iarg = res;
-
-		v4l_dbg(1, debug, client, "get status %x\n", *iarg);
-		break;
-	}
+	v4l2_dbg(1, debug, sd, "set input %x\n", route->input);
 
-	case VIDIOC_S_STD:
-	{
-		v4l2_std_id *iarg = arg;
-		struct timing *timing = NULL;
-
-		v4l_dbg(1, debug, client, "set norm %llx\n", *iarg);
-
-		if (*iarg & V4L2_STD_NTSC) {
-			bt819_setbit(client, 0x01, 0, 1);
-			bt819_setbit(client, 0x01, 1, 0);
-			bt819_setbit(client, 0x01, 5, 0);
-			bt819_write(client, 0x18, 0x68);
-			bt819_write(client, 0x19, 0x5d);
-			/* bt819_setbit(client, 0x1a,  5, 1); */
-			timing = &timing_data[1];
-		} else if (*iarg & V4L2_STD_PAL) {
-			bt819_setbit(client, 0x01, 0, 1);
-			bt819_setbit(client, 0x01, 1, 1);
-			bt819_setbit(client, 0x01, 5, 1);
-			bt819_write(client, 0x18, 0x7f);
-			bt819_write(client, 0x19, 0x72);
-			/* bt819_setbit(client, 0x1a,  5, 0); */
-			timing = &timing_data[0];
-		} else {
-			v4l_dbg(1, debug, client, "unsupported norm %llx\n", *iarg);
-			return -EINVAL;
-		}
-/*		case VIDEO_MODE_AUTO:
-			bt819_setbit(client, 0x01, 0, 0);
-			bt819_setbit(client, 0x01, 1, 0);*/
-
-		bt819_write(client, 0x03,
-			    (((timing->vdelay >> 8) & 0x03) << 6) |
-			    (((timing->vactive >> 8) & 0x03) << 4) |
-			    (((timing->hdelay >> 8) & 0x03) << 2) |
-			     ((timing->hactive >> 8) & 0x03));
-		bt819_write(client, 0x04, timing->vdelay & 0xff);
-		bt819_write(client, 0x05, timing->vactive & 0xff);
-		bt819_write(client, 0x06, timing->hdelay & 0xff);
-		bt819_write(client, 0x07, timing->hactive & 0xff);
-		bt819_write(client, 0x08, (timing->hscale >> 8) & 0xff);
-		bt819_write(client, 0x09, timing->hscale & 0xff);
-		decoder->norm = *iarg;
-		break;
-	}
+	if (route->input < 0 || route->input > 7)
+		return -EINVAL;
 
-	case VIDIOC_INT_S_VIDEO_ROUTING:
-	{
-		struct v4l2_routing *route = arg;
-
-		v4l_dbg(1, debug, client, "set input %x\n", route->input);
-
-		if (route->input < 0 || route->input > 7)
-			return -EINVAL;
-
-		if (decoder->input != route->input) {
-			decoder->input = route->input;
-			/* select mode */
-			if (decoder->input == 0) {
-				bt819_setbit(client, 0x0b, 6, 0);
-				bt819_setbit(client, 0x1a, 1, 1);
-			} else {
-				bt819_setbit(client, 0x0b, 6, 1);
-				bt819_setbit(client, 0x1a, 1, 0);
-			}
+	if (decoder->input != route->input) {
+		decoder->input = route->input;
+		/* select mode */
+		if (decoder->input == 0) {
+			bt819_setbit(decoder, 0x0b, 6, 0);
+			bt819_setbit(decoder, 0x1a, 1, 1);
+		} else {
+			bt819_setbit(decoder, 0x0b, 6, 1);
+			bt819_setbit(decoder, 0x1a, 1, 0);
 		}
-		break;
 	}
+	return 0;
+}
 
-	case VIDIOC_STREAMON:
-	case VIDIOC_STREAMOFF:
-	{
-		int enable = cmd == VIDIOC_STREAMON;
+static int bt819_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct bt819 *decoder = to_bt819(sd);
 
-		v4l_dbg(1, debug, client, "enable output %x\n", enable);
+	v4l2_dbg(1, debug, sd, "enable output %x\n", enable);
 
-		if (decoder->enable != enable) {
-			decoder->enable = enable;
-			bt819_setbit(client, 0x16, 7, !enable);
-		}
-		break;
+	if (decoder->enable != enable) {
+		decoder->enable = enable;
+		bt819_setbit(decoder, 0x16, 7, !enable);
 	}
+	return 0;
+}
 
-	case VIDIOC_QUERYCTRL:
-	{
-		struct v4l2_queryctrl *qc = arg;
-
-		switch (qc->id) {
-		case V4L2_CID_BRIGHTNESS:
-			v4l2_ctrl_query_fill(qc, -128, 127, 1, 0);
-			break;
-
-		case V4L2_CID_CONTRAST:
-			v4l2_ctrl_query_fill(qc, 0, 511, 1, 256);
-			break;
+static int bt819_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
+{
+	switch (qc->id) {
+	case V4L2_CID_BRIGHTNESS:
+		v4l2_ctrl_query_fill(qc, -128, 127, 1, 0);
+		break;
 
-		case V4L2_CID_SATURATION:
-			v4l2_ctrl_query_fill(qc, 0, 511, 1, 256);
-			break;
+	case V4L2_CID_CONTRAST:
+		v4l2_ctrl_query_fill(qc, 0, 511, 1, 256);
+		break;
 
-		case V4L2_CID_HUE:
-			v4l2_ctrl_query_fill(qc, -128, 127, 1, 0);
-			break;
+	case V4L2_CID_SATURATION:
+		v4l2_ctrl_query_fill(qc, 0, 511, 1, 256);
+		break;
 
-		default:
-			return -EINVAL;
-		}
+	case V4L2_CID_HUE:
+		v4l2_ctrl_query_fill(qc, -128, 127, 1, 0);
 		break;
+
+	default:
+		return -EINVAL;
 	}
+	return 0;
+}
 
-	case VIDIOC_S_CTRL:
-	{
-		struct v4l2_control *ctrl = arg;
+static int bt819_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+	struct bt819 *decoder = to_bt819(sd);
+	int temp;
 
-		switch (ctrl->id) {
-		case V4L2_CID_BRIGHTNESS:
-			if (decoder->bright != ctrl->value) {
-				decoder->bright = ctrl->value;
-				bt819_write(client, 0x0a, decoder->bright);
-			}
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		if (decoder->bright == ctrl->value)
 			break;
+		decoder->bright = ctrl->value;
+		bt819_write(decoder, 0x0a, decoder->bright);
+		break;
 
-		case V4L2_CID_CONTRAST:
-			if (decoder->contrast != ctrl->value) {
-				decoder->contrast = ctrl->value;
-				bt819_write(client, 0x0c,
-						decoder->contrast & 0xff);
-				bt819_setbit(client, 0x0b, 2,
-						((decoder->contrast >> 8) & 0x01));
-			}
+	case V4L2_CID_CONTRAST:
+		if (decoder->contrast == ctrl->value)
 			break;
+		decoder->contrast = ctrl->value;
+		bt819_write(decoder, 0x0c, decoder->contrast & 0xff);
+		bt819_setbit(decoder, 0x0b, 2, ((decoder->contrast >> 8) & 0x01));
+		break;
 
-		case V4L2_CID_SATURATION:
-			if (decoder->sat != ctrl->value) {
-				decoder->sat = ctrl->value;
-				bt819_write(client, 0x0d,
-						(decoder->sat >> 7) & 0xff);
-				bt819_setbit(client, 0x0b, 1,
-						((decoder->sat >> 15) & 0x01));
-
-				/* Ratio between U gain and V gain must stay the same as
-				   the ratio between the default U and V gain values. */
-				temp = (decoder->sat * 180) / 254;
-				bt819_write(client, 0x0e, (temp >> 7) & 0xff);
-				bt819_setbit(client, 0x0b, 0, (temp >> 15) & 0x01);
-			}
+	case V4L2_CID_SATURATION:
+		if (decoder->sat == ctrl->value)
 			break;
+		decoder->sat = ctrl->value;
+		bt819_write(decoder, 0x0d, (decoder->sat >> 7) & 0xff);
+		bt819_setbit(decoder, 0x0b, 1, ((decoder->sat >> 15) & 0x01));
+
+		/* Ratio between U gain and V gain must stay the same as
+		   the ratio between the default U and V gain values. */
+		temp = (decoder->sat * 180) / 254;
+		bt819_write(decoder, 0x0e, (temp >> 7) & 0xff);
+		bt819_setbit(decoder, 0x0b, 0, (temp >> 15) & 0x01);
+		break;
 
-		case V4L2_CID_HUE:
-			if (decoder->hue != ctrl->value) {
-				decoder->hue = ctrl->value;
-				bt819_write(client, 0x0f, decoder->hue);
-			}
+	case V4L2_CID_HUE:
+		if (decoder->hue == ctrl->value)
 			break;
-		default:
-			return -EINVAL;
-		}
+		decoder->hue = ctrl->value;
+		bt819_write(decoder, 0x0f, decoder->hue);
 		break;
+
+	default:
+		return -EINVAL;
 	}
+	return 0;
+}
 
-	case VIDIOC_G_CTRL:
-	{
-		struct v4l2_control *ctrl = arg;
+static int bt819_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
+{
+	struct bt819 *decoder = to_bt819(sd);
 
-		switch (ctrl->id) {
-		case V4L2_CID_BRIGHTNESS:
-			ctrl->value = decoder->bright;
-			break;
-		case V4L2_CID_CONTRAST:
-			ctrl->value = decoder->contrast;
-			break;
-		case V4L2_CID_SATURATION:
-			ctrl->value = decoder->sat;
-			break;
-		case V4L2_CID_HUE:
-			ctrl->value = decoder->hue;
-			break;
-		default:
-			return -EINVAL;
-		}
+	switch (ctrl->id) {
+	case V4L2_CID_BRIGHTNESS:
+		ctrl->value = decoder->bright;
+		break;
+	case V4L2_CID_CONTRAST:
+		ctrl->value = decoder->contrast;
+		break;
+	case V4L2_CID_SATURATION:
+		ctrl->value = decoder->sat;
+		break;
+	case V4L2_CID_HUE:
+		ctrl->value = decoder->hue;
 		break;
-	}
-
 	default:
 		return -EINVAL;
 	}
-
 	return 0;
 }
 
+static int bt819_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
+{
+	struct bt819 *decoder = to_bt819(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	return v4l2_chip_ident_i2c_client(client, chip, decoder->ident, 0);
+}
+
+static int bt819_command(struct i2c_client *client, unsigned cmd, void *arg)
+{
+	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
+}
+
 /* ----------------------------------------------------------------------- */
 
-static unsigned short normal_i2c[] = { 0x8a >> 1, I2C_CLIENT_END };
+static const struct v4l2_subdev_core_ops bt819_core_ops = {
+	.g_chip_ident = bt819_g_chip_ident,
+	.g_ctrl = bt819_g_ctrl,
+	.s_ctrl = bt819_s_ctrl,
+	.queryctrl = bt819_queryctrl,
+};
 
-I2C_CLIENT_INSMOD;
+static const struct v4l2_subdev_tuner_ops bt819_tuner_ops = {
+	.s_std = bt819_s_std,
+};
+
+static const struct v4l2_subdev_video_ops bt819_video_ops = {
+	.s_routing = bt819_s_routing,
+	.s_stream = bt819_s_stream,
+	.querystd = bt819_querystd,
+	.g_input_status = bt819_g_input_status,
+};
+
+static const struct v4l2_subdev_ops bt819_ops = {
+	.core = &bt819_core_ops,
+	.tuner = &bt819_tuner_ops,
+	.video = &bt819_video_ops,
+};
+
+/* ----------------------------------------------------------------------- */
 
 static int bt819_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	int i, ver;
 	struct bt819 *decoder;
+	struct v4l2_subdev *sd;
 	const char *name;
 
 	/* Check if the adapter supports the needed features */
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 		return -ENODEV;
 
-	ver = bt819_read(client, 0x17);
+	decoder = kzalloc(sizeof(struct bt819), GFP_KERNEL);
+	if (decoder == NULL)
+		return -ENOMEM;
+	sd = &decoder->sd;
+	v4l2_i2c_subdev_init(sd, client, &bt819_ops);
+
+	ver = bt819_read(decoder, 0x17);
 	switch (ver & 0xf0) {
 	case 0x70:
 		name = "bt819a";
+		decoder->ident = V4L2_IDENT_BT819A;
 		break;
 	case 0x60:
 		name = "bt817a";
+		decoder->ident = V4L2_IDENT_BT817A;
 		break;
 	case 0x20:
 		name = "bt815a";
+		decoder->ident = V4L2_IDENT_BT815A;
 		break;
 	default:
-		v4l_dbg(1, debug, client,
+		v4l2_dbg(1, debug, sd,
 			"unknown chip version 0x%02x\n", ver);
 		return -ENODEV;
 	}
@@ -472,28 +501,26 @@ static int bt819_probe(struct i2c_client *client,
 	v4l_info(client, "%s found @ 0x%x (%s)\n", name,
 			client->addr << 1, client->adapter->name);
 
-	decoder = kzalloc(sizeof(struct bt819), GFP_KERNEL);
-	if (decoder == NULL)
-		return -ENOMEM;
 	decoder->norm = V4L2_STD_NTSC;
 	decoder->input = 0;
 	decoder->enable = 1;
 	decoder->bright = 0;
 	decoder->contrast = 0xd8;	/* 100% of original signal */
 	decoder->hue = 0;
-	decoder->sat = 0xfe;	/* 100% of original signal */
-	decoder->initialized = 0;
-	i2c_set_clientdata(client, decoder);
+	decoder->sat = 0xfe;		/* 100% of original signal */
 
-	i = bt819_init(client);
+	i = bt819_init(sd);
 	if (i < 0)
-		v4l_dbg(1, debug, client, "init status %d\n", i);
+		v4l2_dbg(1, debug, sd, "init status %d\n", i);
 	return 0;
 }
 
 static int bt819_remove(struct i2c_client *client)
 {
-	kfree(i2c_get_clientdata(client));
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+	v4l2_device_unregister_subdev(sd);
+	kfree(to_bt819(sd));
 	return 0;
 }
 

include/media/v4l2-chip-ident.h

@@ -71,6 +71,11 @@ enum {
 	V4L2_IDENT_CX23416 = 416,
 	V4L2_IDENT_CX23418 = 418,
 
+	/* module bt819: reserved range 810-819 */
+	V4L2_IDENT_BT815A = 815,
+	V4L2_IDENT_BT817A = 817,
+	V4L2_IDENT_BT819A = 819,
+
 	/* module bt866: just ident 866 */
 	V4L2_IDENT_BT866 = 866,