/* cx25840 - Conexant CX25840 audio/video decoder driver
 *
 * Copyright (C) 2004 Ulf Eklund
 *
 * Based on the saa7115 driver and on the first verison of Chris Kennedy's
 * cx25840 driver.
 *
 * Changes by Tyler Trafford <tatrafford@comcast.net>
 *    - cleanup/rewrite for V4L2 API (2005)
 *
 * VBI support by Hans Verkuil <hverkuil@xs4all.nl>.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/videodev2.h>
#include <linux/i2c.h>
#include <media/audiochip.h>
#include <media/v4l2-common.h>

#include "cx25840.h"

MODULE_DESCRIPTION("Conexant CX25840 audio/video decoder driver");
MODULE_AUTHOR("Ulf Eklund, Chris Kennedy, Hans Verkuil, Tyler Trafford");
MODULE_LICENSE("GPL");

static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };


int cx25840_debug = 0;

module_param(cx25840_debug, bool, 0644);

MODULE_PARM_DESC(cx25840_debug, "Debugging messages [0=Off (default) 1=On]");

I2C_CLIENT_INSMOD;

/* ----------------------------------------------------------------------- */

int cx25840_write(struct i2c_client *client, u16 addr, u8 value)
{
	u8 buffer[3];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;
	buffer[2] = value;
	return i2c_master_send(client, buffer, 3);
}

int cx25840_write4(struct i2c_client *client, u16 addr, u32 value)
{
	u8 buffer[6];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;
	buffer[2] = value >> 24;
	buffer[3] = (value >> 16) & 0xff;
	buffer[4] = (value >> 8) & 0xff;
	buffer[5] = value & 0xff;
	return i2c_master_send(client, buffer, 6);
}

u8 cx25840_read(struct i2c_client * client, u16 addr)
{
	u8 buffer[2];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;

	if (i2c_master_send(client, buffer, 2) < 2)
		return 0;

	if (i2c_master_recv(client, buffer, 1) < 1)
		return 0;

	return buffer[0];
}

u32 cx25840_read4(struct i2c_client * client, u16 addr)
{
	u8 buffer[4];
	buffer[0] = addr >> 8;
	buffer[1] = addr & 0xff;

	if (i2c_master_send(client, buffer, 2) < 2)
		return 0;

	if (i2c_master_recv(client, buffer, 4) < 4)
		return 0;

	return (buffer[0] << 24) | (buffer[1] << 16) |
	    (buffer[2] << 8) | buffer[3];
}

int cx25840_and_or(struct i2c_client *client, u16 addr, u8 and_mask,
		   u8 or_value)
{
	return cx25840_write(client, addr,
			     (cx25840_read(client, addr) & and_mask) |
			     or_value);
}

/* ----------------------------------------------------------------------- */

static int set_input(struct i2c_client *, enum cx25840_input);
static void input_change(struct i2c_client *);
static void log_status(struct i2c_client *client);

/* ----------------------------------------------------------------------- */

static inline void init_dll1(struct i2c_client *client)
{
	/* This is the Hauppauge sequence used to
	 * initialize the Delay Lock Loop 1 (ADC DLL). */
	cx25840_write(client, 0x159, 0x23);
	cx25840_write(client, 0x15a, 0x87);
	cx25840_write(client, 0x15b, 0x06);
	cx25840_write(client, 0x159, 0xe1);
	cx25840_write(client, 0x15a, 0x86);
	cx25840_write(client, 0x159, 0xe0);
	cx25840_write(client, 0x159, 0xe1);
	cx25840_write(client, 0x15b, 0x10);
}

static inline void init_dll2(struct i2c_client *client)
{
	/* This is the Hauppauge sequence used to
	 * initialize the Delay Lock Loop 2 (ADC DLL). */
	cx25840_write(client, 0x15d, 0xe3);
	cx25840_write(client, 0x15e, 0x86);
	cx25840_write(client, 0x15f, 0x06);
	cx25840_write(client, 0x15d, 0xe1);
	cx25840_write(client, 0x15d, 0xe0);
	cx25840_write(client, 0x15d, 0xe1);
}

static void cx25840_initialize(struct i2c_client *client, int loadfw)
{
	struct cx25840_state *state = i2c_get_clientdata(client);

	/* datasheet startup in numbered steps, refer to page 3-77 */
	/* 2. */
	cx25840_and_or(client, 0x803, ~0x10, 0x00);
	/* The default of this register should be 4, but I get 0 instead.
	 * Set this register to 4 manually. */
	cx25840_write(client, 0x000, 0x04);
	/* 3. */
	init_dll1(client);
	init_dll2(client);
	cx25840_write(client, 0x136, 0x0a);
	/* 4. */
	cx25840_write(client, 0x13c, 0x01);
	cx25840_write(client, 0x13c, 0x00);
	/* 5. */
	if (loadfw)
		cx25840_loadfw(client);
	/* 6. */
	cx25840_write(client, 0x115, 0x8c);
	cx25840_write(client, 0x116, 0x07);
	cx25840_write(client, 0x118, 0x02);
	/* 7. */
	cx25840_write(client, 0x4a5, 0x80);
	cx25840_write(client, 0x4a5, 0x00);
	cx25840_write(client, 0x402, 0x00);
	/* 8. */
	cx25840_write(client, 0x401, 0x18);
	cx25840_write(client, 0x4a2, 0x10);
	cx25840_write(client, 0x402, 0x04);
	/* 10. */
	cx25840_write(client, 0x8d3, 0x1f);
	cx25840_write(client, 0x8e3, 0x03);

	cx25840_vbi_setup(client);

	/* trial and error says these are needed to get audio */
	cx25840_write(client, 0x914, 0xa0);
	cx25840_write(client, 0x918, 0xa0);
	cx25840_write(client, 0x919, 0x01);

	/* stereo prefered */
	cx25840_write(client, 0x809, 0x04);
	/* AC97 shift */
	cx25840_write(client, 0x8cf, 0x0f);

	/* (re)set video input */
	set_input(client, state->input);
	/* (re)set audio input */
	cx25840_audio(client, AUDC_SET_INPUT, &state->audio_input);

	/* start microcontroller */
	cx25840_and_or(client, 0x803, ~0x10, 0x10);
}

/* ----------------------------------------------------------------------- */

static void input_change(struct i2c_client *client)
{
	struct cx25840_state *state = i2c_get_clientdata(client);
	v4l2_std_id std = cx25840_get_v4lstd(client);

	/* Note: perhaps V4L2_STD_PAL_M should be handled as V4L2_STD_NTSC
	   instead of V4L2_STD_PAL. Someone needs to test this. */
	if (std & V4L2_STD_PAL) {
		/* Follow tuner change procedure for PAL */
		cx25840_write(client, 0x808, 0xff);
		cx25840_write(client, 0x80b, 0x10);
	} else if (std & V4L2_STD_SECAM) {
		/* Select autodetect for SECAM */
		cx25840_write(client, 0x808, 0xff);
		cx25840_write(client, 0x80b, 0x10);
	} else if (std & V4L2_STD_NTSC) {
		/* NTSC */
		if (state->cardtype == CARDTYPE_PVR150_WORKAROUND) {
			/* Certain Hauppauge PVR150 models have a hardware bug
			   that causes audio to drop out. For these models the
			   audio standard must be set explicitly.
			   To be precise: it affects cards with tuner models
			   85, 99 and 112 (model numbers from tveeprom). */
			if (std == V4L2_STD_NTSC_M_JP) {
				/* Japan uses EIAJ audio standard */
				cx25840_write(client, 0x808, 0x2f);
			} else {
				/* Others use the BTSC audio standard */
				cx25840_write(client, 0x808, 0x1f);
			}
			/* South Korea uses the A2-M (aka Zweiton M) audio
			   standard, and should set 0x808 to 0x3f, but I don't
			   know how to detect this. */
		} else if (std == V4L2_STD_NTSC_M_JP) {
			/* Japan uses EIAJ audio standard */
			cx25840_write(client, 0x808, 0xf7);
		} else {
			/* Others use the BTSC audio standard */
			cx25840_write(client, 0x808, 0xf6);
		}
		/* South Korea uses the A2-M (aka Zweiton M) audio standard,
		   and should set 0x808 to 0xf8, but I don't know how to
		   detect this. */
		cx25840_write(client, 0x80b, 0x00);
	}

	if (cx25840_read(client, 0x803) & 0x10) {
		/* restart audio decoder microcontroller */
		cx25840_and_or(client, 0x803, ~0x10, 0x00);
		cx25840_and_or(client, 0x803, ~0x10, 0x10);
	}
}

static int set_input(struct i2c_client *client, enum cx25840_input input)
{
	struct cx25840_state *state = i2c_get_clientdata(client);

	cx25840_dbg("decoder set input (%d)\n", input);

	switch (input) {
	case CX25840_TUNER:
		cx25840_dbg("now setting Tuner input\n");

		if (state->cardtype == CARDTYPE_PVR150 ||
		    state->cardtype == CARDTYPE_PVR150_WORKAROUND) {
			/* CH_SEL_ADC2=1 */
			cx25840_and_or(client, 0x102, ~0x2, 0x02);
		}

		/* Video Input Control */
		if (state->cardtype == CARDTYPE_PG600) {
			cx25840_write(client, 0x103, 0x11);
		} else {
			cx25840_write(client, 0x103, 0x46);
		}

		/* INPUT_MODE=0 */
		cx25840_and_or(client, 0x401, ~0x6, 0x00);
		break;

	case CX25840_COMPOSITE0:
	case CX25840_COMPOSITE1:
		cx25840_dbg("now setting Composite input\n");

		/* Video Input Control */
		if (state->cardtype == CARDTYPE_PG600) {
			cx25840_write(client, 0x103, 0x00);
		} else {
			cx25840_write(client, 0x103, 0x02);
		}

		/* INPUT_MODE=0 */
		cx25840_and_or(client, 0x401, ~0x6, 0x00);
		break;

	case CX25840_SVIDEO0:
	case CX25840_SVIDEO1:
		cx25840_dbg("now setting S-Video input\n");

		/* CH_SEL_ADC2=0 */
		cx25840_and_or(client, 0x102, ~0x2, 0x00);

		/* Video Input Control */
		if (state->cardtype == CARDTYPE_PG600) {
			cx25840_write(client, 0x103, 0x02);
		} else {
			cx25840_write(client, 0x103, 0x10);
		}

		/* INPUT_MODE=1 */
		cx25840_and_or(client, 0x401, ~0x6, 0x02);
		break;

	default:
		cx25840_err("%d is not a valid input!\n", input);
		return -EINVAL;
	}

	state->input = input;
	input_change(client);
	return 0;
}

/* ----------------------------------------------------------------------- */

static int set_v4lstd(struct i2c_client *client, v4l2_std_id std)
{
	u8 fmt;

	switch (std) {
	/* zero is autodetect */
	case 0: fmt = 0x0; break;
	/* default ntsc to ntsc-m */
	case V4L2_STD_NTSC:
	case V4L2_STD_NTSC_M: fmt = 0x1; break;
	case V4L2_STD_NTSC_M_JP: fmt = 0x2; break;
	case V4L2_STD_NTSC_443: fmt = 0x3; break;
	case V4L2_STD_PAL: fmt = 0x4; break;
	case V4L2_STD_PAL_M: fmt = 0x5; break;
	case V4L2_STD_PAL_N: fmt = 0x6; break;
	case V4L2_STD_PAL_Nc: fmt = 0x7; break;
	case V4L2_STD_PAL_60: fmt = 0x8; break;
	case V4L2_STD_SECAM: fmt = 0xc; break;
	default:
		return -ERANGE;
	}

	cx25840_and_or(client, 0x400, ~0xf, fmt);
	cx25840_vbi_setup(client);
	return 0;
}

v4l2_std_id cx25840_get_v4lstd(struct i2c_client * client)
{
	/* check VID_FMT_SEL first */
	u8 fmt = cx25840_read(client, 0x400) & 0xf;

	if (!fmt) {
		/* check AFD_FMT_STAT if set to autodetect */
		fmt = cx25840_read(client, 0x40d) & 0xf;
	}

	switch (fmt) {
	case 0x1: return V4L2_STD_NTSC_M;
	case 0x2: return V4L2_STD_NTSC_M_JP;
	case 0x3: return V4L2_STD_NTSC_443;
	case 0x4: return V4L2_STD_PAL;
	case 0x5: return V4L2_STD_PAL_M;
	case 0x6: return V4L2_STD_PAL_N;
	case 0x7: return V4L2_STD_PAL_Nc;
	case 0x8: return V4L2_STD_PAL_60;
	case 0xc: return V4L2_STD_SECAM;
	default: return V4L2_STD_UNKNOWN;
	}
}

/* ----------------------------------------------------------------------- */

static int set_v4lctrl(struct i2c_client *client, struct v4l2_control *ctrl)
{
	struct cx25840_state *state = i2c_get_clientdata(client);

	switch (ctrl->id) {
	case CX25840_CID_CARDTYPE:
		switch (ctrl->value) {
		case CARDTYPE_PVR150:
		case CARDTYPE_PVR150_WORKAROUND:
		case CARDTYPE_PG600:
			state->cardtype = ctrl->value;
			break;
		default:
			return -ERANGE;
		}

		set_input(client, state->input);
		break;

	case V4L2_CID_BRIGHTNESS:
		if (ctrl->value < 0 || ctrl->value > 255) {
			cx25840_err("invalid brightness setting %d\n",
				    ctrl->value);
			return -ERANGE;
		}

		cx25840_write(client, 0x414, ctrl->value - 128);
		break;

	case V4L2_CID_CONTRAST:
		if (ctrl->value < 0 || ctrl->value > 127) {
			cx25840_err("invalid contrast setting %d\n",
				    ctrl->value);
			return -ERANGE;
		}

		cx25840_write(client, 0x415, ctrl->value << 1);
		break;

	case V4L2_CID_SATURATION:
		if (ctrl->value < 0 || ctrl->value > 127) {
			cx25840_err("invalid saturation setting %d\n",
				    ctrl->value);
			return -ERANGE;
		}

		cx25840_write(client, 0x420, ctrl->value << 1);
		cx25840_write(client, 0x421, ctrl->value << 1);
		break;

	case V4L2_CID_HUE:
		if (ctrl->value < -127 || ctrl->value > 127) {
			cx25840_err("invalid hue setting %d\n", ctrl->value);
			return -ERANGE;
		}

		cx25840_write(client, 0x422, ctrl->value);
		break;

	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_MUTE:
		return cx25840_audio(client, VIDIOC_S_CTRL, ctrl);
	}

	return 0;
}

static int get_v4lctrl(struct i2c_client *client, struct v4l2_control *ctrl)
{
	struct cx25840_state *state = i2c_get_clientdata(client);

	switch (ctrl->id) {
	case CX25840_CID_CARDTYPE:
		ctrl->value = state->cardtype;
		break;
	case V4L2_CID_BRIGHTNESS:
		ctrl->value = cx25840_read(client, 0x414) + 128;
		break;
	case V4L2_CID_CONTRAST:
		ctrl->value = cx25840_read(client, 0x415) >> 1;
		break;
	case V4L2_CID_SATURATION:
		ctrl->value = cx25840_read(client, 0x420) >> 1;
		break;
	case V4L2_CID_HUE:
		ctrl->value = cx25840_read(client, 0x422);
		break;
	case V4L2_CID_AUDIO_VOLUME:
	case V4L2_CID_AUDIO_BASS:
	case V4L2_CID_AUDIO_TREBLE:
	case V4L2_CID_AUDIO_BALANCE:
	case V4L2_CID_AUDIO_MUTE:
		return cx25840_audio(client, VIDIOC_G_CTRL, ctrl);
	default:
		return -EINVAL;
	}

	return 0;
}

/* ----------------------------------------------------------------------- */

static int get_v4lfmt(struct i2c_client *client, struct v4l2_format *fmt)
{
	switch (fmt->type) {
	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
		return cx25840_vbi(client, VIDIOC_G_FMT, fmt);
	default:
		return -EINVAL;
	}

	return 0;
}

static int set_v4lfmt(struct i2c_client *client, struct v4l2_format *fmt)
{
	struct v4l2_pix_format *pix;
	int HSC, VSC, Vsrc, Hsrc, filter, Vlines;
	int is_pal = !(cx25840_get_v4lstd(client) & V4L2_STD_NTSC);

	switch (fmt->type) {
	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
		pix = &(fmt->fmt.pix);

		Vsrc = (cx25840_read(client, 0x476) & 0x3f) << 4;
		Vsrc |= (cx25840_read(client, 0x475) & 0xf0) >> 4;

		Hsrc = (cx25840_read(client, 0x472) & 0x3f) << 4;
		Hsrc |= (cx25840_read(client, 0x471) & 0xf0) >> 4;

		Vlines = pix->height + (is_pal ? 4 : 7);

		if ((pix->width * 16 < Hsrc) || (Hsrc < pix->width) ||
		    (Vlines * 8 < Vsrc) || (Vsrc < Vlines)) {
			cx25840_err("%dx%d is not a valid size!\n",
				    pix->width, pix->height);
			return -ERANGE;
		}

		HSC = (Hsrc * (1 << 20)) / pix->width - (1 << 20);
		VSC = (1 << 16) - (Vsrc * (1 << 9) / Vlines - (1 << 9));
		VSC &= 0x1fff;

		if (pix->width >= 385)
			filter = 0;
		else if (pix->width > 192)
			filter = 1;
		else if (pix->width > 96)
			filter = 2;
		else
			filter = 3;

		cx25840_dbg("decoder set size %dx%d -> scale  %ux%u\n",
			    pix->width, pix->height, HSC, VSC);

		/* HSCALE=HSC */
		cx25840_write(client, 0x418, HSC & 0xff);
		cx25840_write(client, 0x419, (HSC >> 8) & 0xff);
		cx25840_write(client, 0x41a, HSC >> 16);
		/* VSCALE=VSC */
		cx25840_write(client, 0x41c, VSC & 0xff);
		cx25840_write(client, 0x41d, VSC >> 8);
		/* VS_INTRLACE=1 VFILT=filter */
		cx25840_write(client, 0x41e, 0x8 | filter);
		break;

	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
		return cx25840_vbi(client, VIDIOC_S_FMT, fmt);

	case V4L2_BUF_TYPE_VBI_CAPTURE:
		return cx25840_vbi(client, VIDIOC_S_FMT, fmt);

	default:
		return -EINVAL;
	}

	return 0;
}

/* ----------------------------------------------------------------------- */

static int cx25840_command(struct i2c_client *client, unsigned int cmd,
			   void *arg)
{
	struct cx25840_state *state = i2c_get_clientdata(client);
	struct v4l2_tuner *vt = arg;
	int result = 0;

	switch (cmd) {
	case 0:
		break;

#ifdef CONFIG_VIDEO_ADV_DEBUG
	/* ioctls to allow direct access to the
	 * cx25840 registers for testing */
	case VIDIOC_INT_G_REGISTER:
	{
		struct v4l2_register *reg = arg;

		if (reg->i2c_id != I2C_DRIVERID_CX25840)
			return -EINVAL;
		reg->val = cx25840_read(client, reg->reg & 0x0fff);
		break;
	}

	case VIDIOC_INT_S_REGISTER:
	{
		struct v4l2_register *reg = arg;

		if (reg->i2c_id != I2C_DRIVERID_CX25840)
			return -EINVAL;
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		cx25840_write(client, reg->reg & 0x0fff, reg->val & 0xff);
		break;
	}
#endif

	case VIDIOC_INT_DECODE_VBI_LINE:
		return cx25840_vbi(client, cmd, arg);

	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
	case AUDC_SET_INPUT:
		result = cx25840_audio(client, cmd, arg);
		break;

	case VIDIOC_STREAMON:
		cx25840_dbg("enable output\n");
		cx25840_write(client, 0x115, 0x8c);
		cx25840_write(client, 0x116, 0x07);
		break;

	case VIDIOC_STREAMOFF:
		cx25840_dbg("disable output\n");
		cx25840_write(client, 0x115, 0x00);
		cx25840_write(client, 0x116, 0x00);
		break;

	case VIDIOC_LOG_STATUS:
		log_status(client);
		break;

	case VIDIOC_G_CTRL:
		result = get_v4lctrl(client, (struct v4l2_control *)arg);
		break;

	case VIDIOC_S_CTRL:
		result = set_v4lctrl(client, (struct v4l2_control *)arg);
		break;

	case VIDIOC_G_STD:
		*(v4l2_std_id *)arg = cx25840_get_v4lstd(client);
		break;

	case VIDIOC_S_STD:
		result = set_v4lstd(client, *(v4l2_std_id *)arg);
		break;

	case VIDIOC_G_INPUT:
		*(int *)arg = state->input;
		break;

	case VIDIOC_S_INPUT:
		result = set_input(client, *(int *)arg);
		break;

	case VIDIOC_S_FREQUENCY:
		input_change(client);
		break;

	case VIDIOC_G_TUNER:
	{
		u8 mode = cx25840_read(client, 0x804);
		u8 pref = cx25840_read(client, 0x809) & 0xf;
		u8 vpres = cx25840_read(client, 0x80a) & 0x10;
		int val = 0;

		vt->capability |=
		    V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LANG1 |
		    V4L2_TUNER_CAP_LANG2 | V4L2_TUNER_CAP_SAP;

		vt->signal = vpres ? 0xffff : 0x0;

		/* get rxsubchans and audmode */
		if ((mode & 0xf) == 1)
			val |= V4L2_TUNER_SUB_STEREO;
		else
			val |= V4L2_TUNER_SUB_MONO;

		if (mode == 2 || mode == 4)
			val |= V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;

		if (mode & 0x10)
			val |= V4L2_TUNER_SUB_SAP;

		vt->rxsubchans = val;

		switch (pref) {
		case 0:
			vt->audmode = V4L2_TUNER_MODE_MONO;
			break;
		case 1:
		case 2:
			vt->audmode = V4L2_TUNER_MODE_LANG2;
			break;
		case 4:
		default:
			vt->audmode = V4L2_TUNER_MODE_STEREO;
		}
		break;
	}

	case VIDIOC_S_TUNER:
		switch (vt->audmode) {
		case V4L2_TUNER_MODE_MONO:
		case V4L2_TUNER_MODE_LANG1:
			/* Force PREF_MODE to MONO */
			cx25840_and_or(client, 0x809, ~0xf, 0x00);
			break;
		case V4L2_TUNER_MODE_STEREO:
			/* Force PREF_MODE to STEREO */
			cx25840_and_or(client, 0x809, ~0xf, 0x04);
			break;
		case V4L2_TUNER_MODE_LANG2:
			/* Force PREF_MODE to LANG2 */
			cx25840_and_or(client, 0x809, ~0xf, 0x01);
			break;
		}
		break;

	case VIDIOC_G_FMT:
		result = get_v4lfmt(client, (struct v4l2_format *)arg);
		break;

	case VIDIOC_S_FMT:
		result = set_v4lfmt(client, (struct v4l2_format *)arg);
		break;

	case VIDIOC_INT_RESET:
		cx25840_initialize(client, 0);
		break;

	case VIDIOC_INT_G_CHIP_IDENT:
		*(enum v4l2_chip_ident *)arg =
			V4L2_IDENT_CX25840 + ((cx25840_read(client, 0x100) >> 4) & 0xf);
		break;

	default:
		cx25840_err("invalid ioctl %x\n", cmd);
		return -EINVAL;
	}

	return result;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver i2c_driver_cx25840;

static int cx25840_detect_client(struct i2c_adapter *adapter, int address,
				 int kind)
{
	struct i2c_client *client;
	struct cx25840_state *state;
	u16 device_id;

	/* Check if the adapter supports the needed features
	 * Not until kernel version 2.6.11 did the bit-algo
	 * correctly report that it would do an I2C-level xfer */
	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
		return 0;

	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (client == 0)
		return -ENOMEM;

	memset(client, 0, sizeof(struct i2c_client));
	client->addr = address;
	client->adapter = adapter;
	client->driver = &i2c_driver_cx25840;
	client->flags = I2C_CLIENT_ALLOW_USE;
	snprintf(client->name, sizeof(client->name) - 1, "cx25840");

	cx25840_dbg("detecting cx25840 client on address 0x%x\n", address << 1);

	device_id = cx25840_read(client, 0x101) << 8;
	device_id |= cx25840_read(client, 0x100);

	/* The high byte of the device ID should be
	 * 0x84 if chip is present */
	if ((device_id & 0xff00) != 0x8400) {
		cx25840_dbg("cx25840 not found\n");
		kfree(client);
		return 0;
	}

	cx25840_info("cx25%3x-2%x found @ 0x%x (%s)\n",
		    (device_id & 0xfff0) >> 4,
		    (device_id & 0x0f) < 3 ? (device_id & 0x0f) + 1 : 3,
		    address << 1, adapter->name);

	state = kmalloc(sizeof(struct cx25840_state), GFP_KERNEL);
	if (state == NULL) {
		kfree(client);
		return -ENOMEM;
	}

	i2c_set_clientdata(client, state);
	memset(state, 0, sizeof(struct cx25840_state));
	state->input = CX25840_TUNER;
	state->audclk_freq = V4L2_AUDCLK_48_KHZ;
	state->audio_input = AUDIO_TUNER;
	state->cardtype = CARDTYPE_PVR150;

	cx25840_initialize(client, 1);

	i2c_attach_client(client);

	return 0;
}

static int cx25840_attach_adapter(struct i2c_adapter *adapter)
{
#ifdef I2C_CLASS_TV_ANALOG
	if (adapter->class & I2C_CLASS_TV_ANALOG)
#else
	if (adapter->id == I2C_HW_B_BT848)
#endif
		return i2c_probe(adapter, &addr_data, &cx25840_detect_client);
	return 0;
}

static int cx25840_detach_client(struct i2c_client *client)
{
	struct cx25840_state *state = i2c_get_clientdata(client);
	int err;

	err = i2c_detach_client(client);
	if (err) {
		return err;
	}

	kfree(state);
	kfree(client);

	return 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver i2c_driver_cx25840 = {
	.name = "cx25840",

	.id = I2C_DRIVERID_CX25840,
	.flags = I2C_DF_NOTIFY,

	.attach_adapter = cx25840_attach_adapter,
	.detach_client = cx25840_detach_client,
	.command = cx25840_command,
	.owner = THIS_MODULE,
};


static int __init m__init(void)
{
	return i2c_add_driver(&i2c_driver_cx25840);
}

static void __exit m__exit(void)
{
	i2c_del_driver(&i2c_driver_cx25840);
}

module_init(m__init);
module_exit(m__exit);

/* ----------------------------------------------------------------------- */

static void log_status(struct i2c_client *client)
{
	static const char *const fmt_strs[] = {
		"0x0",
		"NTSC-M", "NTSC-J", "NTSC-4.43",
		"PAL-BDGHI", "PAL-M", "PAL-N", "PAL-Nc", "PAL-60",
		"0x9", "0xA", "0xB",
		"SECAM",
		"0xD", "0xE", "0xF"
	};

	struct cx25840_state *state = i2c_get_clientdata(client);
	u8 microctrl_vidfmt = cx25840_read(client, 0x80a);
	u8 vidfmt_sel = cx25840_read(client, 0x400) & 0xf;
	u8 gen_stat1 = cx25840_read(client, 0x40d);
	u8 download_ctl = cx25840_read(client, 0x803);
	u8 mod_det_stat0 = cx25840_read(client, 0x804);
	u8 mod_det_stat1 = cx25840_read(client, 0x805);
	u8 audio_config = cx25840_read(client, 0x808);
	u8 pref_mode = cx25840_read(client, 0x809);
	u8 afc0 = cx25840_read(client, 0x80b);
	u8 mute_ctl = cx25840_read(client, 0x8d3);
	char *p;

	cx25840_info("Video signal:              %spresent\n",
		    (microctrl_vidfmt & 0x10) ? "" : "not ");
	cx25840_info("Detected format:           %s\n",
		    fmt_strs[gen_stat1 & 0xf]);

	switch (mod_det_stat0) {
	case 0x00: p = "mono"; break;
	case 0x01: p = "stereo"; break;
	case 0x02: p = "dual"; break;
	case 0x04: p = "tri"; break;
	case 0x10: p = "mono with SAP"; break;
	case 0x11: p = "stereo with SAP"; break;
	case 0x12: p = "dual with SAP"; break;
	case 0x14: p = "tri with SAP"; break;
	case 0xfe: p = "forced mode"; break;
	default: p = "not defined";
	}
	cx25840_info("Detected audio mode:       %s\n", p);

	switch (mod_det_stat1) {
	case 0x00: p = "not defined"; break;
	case 0x01: p = "EIAJ"; break;
	case 0x02: p = "A2-M"; break;
	case 0x03: p = "A2-BG"; break;
	case 0x04: p = "A2-DK1"; break;
	case 0x05: p = "A2-DK2"; break;
	case 0x06: p = "A2-DK3"; break;
	case 0x07: p = "A1 (6.0 MHz FM Mono)"; break;
	case 0x08: p = "AM-L"; break;
	case 0x09: p = "NICAM-BG"; break;
	case 0x0a: p = "NICAM-DK"; break;
	case 0x0b: p = "NICAM-I"; break;
	case 0x0c: p = "NICAM-L"; break;
	case 0x0d: p = "BTSC/EIAJ/A2-M Mono (4.5 MHz FMMono)"; break;
	case 0x0e: p = "IF FM Radio"; break;
	case 0x0f: p = "BTSC"; break;
	case 0x10: p = "high-deviation FM"; break;
	case 0x11: p = "very high-deviation FM"; break;
	case 0xfd: p = "unknown audio standard"; break;
	case 0xfe: p = "forced audio standard"; break;
	case 0xff: p = "no detected audio standard"; break;
	default: p = "not defined";
	}
	cx25840_info("Detected audio standard:   %s\n", p);
	cx25840_info("Audio muted:               %s\n",
		    (mute_ctl & 0x2) ? "yes" : "no");
	cx25840_info("Audio microcontroller:     %s\n",
		    (download_ctl & 0x10) ? "running" : "stopped");

	switch (audio_config >> 4) {
	case 0x00: p = "undefined"; break;
	case 0x01: p = "BTSC"; break;
	case 0x02: p = "EIAJ"; break;
	case 0x03: p = "A2-M"; break;
	case 0x04: p = "A2-BG"; break;
	case 0x05: p = "A2-DK1"; break;
	case 0x06: p = "A2-DK2"; break;
	case 0x07: p = "A2-DK3"; break;
	case 0x08: p = "A1 (6.0 MHz FM Mono)"; break;
	case 0x09: p = "AM-L"; break;
	case 0x0a: p = "NICAM-BG"; break;
	case 0x0b: p = "NICAM-DK"; break;
	case 0x0c: p = "NICAM-I"; break;
	case 0x0d: p = "NICAM-L"; break;
	case 0x0e: p = "FM radio"; break;
	case 0x0f: p = "automatic detection"; break;
	default: p = "undefined";
	}
	cx25840_info("Configured audio standard: %s\n", p);

	if ((audio_config >> 4) < 0xF) {
		switch (audio_config & 0xF) {
		case 0x00: p = "MONO1 (LANGUAGE A/Mono L+R channel for BTSC, EIAJ, A2)"; break;
		case 0x01: p = "MONO2 (LANGUAGE B)"; break;
		case 0x02: p = "MONO3 (STEREO forced MONO)"; break;
		case 0x03: p = "MONO4 (NICAM ANALOG-Language C/Analog Fallback)"; break;
		case 0x04: p = "STEREO"; break;
		case 0x05: p = "DUAL1 (AB)"; break;
		case 0x06: p = "DUAL2 (AC) (FM)"; break;
		case 0x07: p = "DUAL3 (BC) (FM)"; break;
		case 0x08: p = "DUAL4 (AC) (AM)"; break;
		case 0x09: p = "DUAL5 (BC) (AM)"; break;
		case 0x0a: p = "SAP"; break;
		default: p = "undefined";
		}
		cx25840_info("Configured audio mode:     %s\n", p);
	} else {
		switch (audio_config & 0xF) {
		case 0x00: p = "BG"; break;
		case 0x01: p = "DK1"; break;
		case 0x02: p = "DK2"; break;
		case 0x03: p = "DK3"; break;
		case 0x04: p = "I"; break;
		case 0x05: p = "L"; break;
		case 0x06: p = "BTSC"; break;
		case 0x07: p = "EIAJ"; break;
		case 0x08: p = "A2-M"; break;
		case 0x09: p = "FM Radio"; break;
		case 0x0f: p = "automatic standard and mode detection"; break;
		default: p = "undefined";
		}
		cx25840_info("Configured audio system:   %s\n", p);
	}

	cx25840_info("Specified standard:        %s\n",
		    vidfmt_sel ? fmt_strs[vidfmt_sel] : "automatic detection");

	switch (state->input) {
	case CX25840_COMPOSITE0: p = "Composite 0"; break;
	case CX25840_COMPOSITE1: p = "Composite 1"; break;
	case CX25840_SVIDEO0: p = "S-Video 0"; break;
	case CX25840_SVIDEO1: p = "S-Video 1"; break;
	case CX25840_TUNER: p = "Tuner"; break;
	}
	cx25840_info("Specified input:           %s\n", p);
	cx25840_info("Specified audio input:     %s\n",
		    state->audio_input == 0 ? "Tuner" : "External");

	switch (state->audclk_freq) {
	case V4L2_AUDCLK_441_KHZ: p = "44.1 kHz"; break;
	case V4L2_AUDCLK_48_KHZ: p = "48 kHz"; break;
	case V4L2_AUDCLK_32_KHZ: p = "32 kHz"; break;
	default: p = "undefined";
	}
	cx25840_info("Specified audioclock freq: %s\n", p);

	switch (pref_mode & 0xf) {
	case 0: p = "mono/language A"; break;
	case 1: p = "language B"; break;
	case 2: p = "language C"; break;
	case 3: p = "analog fallback"; break;
	case 4: p = "stereo"; break;
	case 5: p = "language AC"; break;
	case 6: p = "language BC"; break;
	case 7: p = "language AB"; break;
	default: p = "undefined";
	}
	cx25840_info("Preferred audio mode:      %s\n", p);

	if ((audio_config & 0xf) == 0xf) {
		switch ((afc0 >> 3) & 0x3) {
		case 0: p = "system DK"; break;
		case 1: p = "system L"; break;
		case 2: p = "autodetect"; break;
		default: p = "undefined";
		}
		cx25840_info("Selected 65 MHz format:    %s\n", p);

		switch (afc0 & 0x7) {
		case 0: p = "chroma"; break;
		case 1: p = "BTSC"; break;
		case 2: p = "EIAJ"; break;
		case 3: p = "A2-M"; break;
		case 4: p = "autodetect"; break;
		default: p = "undefined";
		}
		cx25840_info("Selected 45 MHz format:    %s\n", p);
	}
}