drivers/media/i2c/msp3400-driver.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Programming the mspx4xx sound processor family
 *
 * (c) 1997-2001 Gerd Knorr <kraxel@bytesex.org>
 *
 * what works and what doesn't:
 *
 *  AM-Mono
 *      Support for Hauppauge cards added (decoding handled by tuner) added by
 *      Frederic Crozat <fcrozat@mail.dotcom.fr>
 *
 *  FM-Mono
 *      should work. The stereo modes are backward compatible to FM-mono,
 *      therefore FM-Mono should be always available.
 *
 *  FM-Stereo (B/G, used in germany)
 *      should work, with autodetect
 *
 *  FM-Stereo (satellite)
 *      should work, no autodetect (i.e. default is mono, but you can
 *      switch to stereo -- untested)
 *
 *  NICAM (B/G, L , used in UK, Scandinavia, Spain and France)
 *      should work, with autodetect. Support for NICAM was added by
 *      Pekka Pietikainen <pp@netppl.fi>
 *
 * TODO:
 *   - better SAT support
 *
 * 980623  Thomas Sailer (sailer@ife.ee.ethz.ch)
 *         using soundcore instead of OSS
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/drv-intf/msp3400.h>
#include <media/i2c/tvaudio.h>
#include "msp3400-driver.h"

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

MODULE_DESCRIPTION("device driver for msp34xx TV sound processor");
MODULE_AUTHOR("Gerd Knorr");
MODULE_LICENSE("GPL");

/* module parameters */
static int opmode   = OPMODE_AUTO;
int msp_debug;		 /* msp_debug output */
bool msp_once;		 /* no continuous stereo monitoring */
bool msp_amsound;	 /* hard-wire AM sound at 6.5 Hz (france),
			    the autoscan seems work well only with FM... */
int msp_standard = 1;    /* Override auto detect of audio msp_standard,
			    if needed. */
bool msp_dolby;

int msp_stereo_thresh = 0x190; /* a2 threshold for stereo/bilingual
					(msp34xxg only) 0x00a0-0x03c0 */

/* read-only */
module_param(opmode,           int, 0444);

/* read-write */
module_param_named(once, msp_once,                      bool, 0644);
module_param_named(debug, msp_debug,                    int,  0644);
module_param_named(stereo_threshold, msp_stereo_thresh, int,  0644);
module_param_named(standard, msp_standard,              int,  0644);
module_param_named(amsound, msp_amsound,                bool, 0644);
module_param_named(dolby, msp_dolby,                    bool, 0644);

MODULE_PARM_DESC(opmode, "Forces a MSP3400 opmode. 0=Manual, 1=Autodetect, 2=Autodetect and autoselect");
MODULE_PARM_DESC(once, "No continuous stereo monitoring");
MODULE_PARM_DESC(debug, "Enable debug messages [0-3]");
MODULE_PARM_DESC(stereo_threshold, "Sets signal threshold to activate stereo");
MODULE_PARM_DESC(standard, "Specify audio standard: 32 = NTSC, 64 = radio, Default: Autodetect");
MODULE_PARM_DESC(amsound, "Hardwire AM sound at 6.5Hz (France), FM can autoscan");
MODULE_PARM_DESC(dolby, "Activates Dolby processing");

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

/* control subaddress */
#define I2C_MSP_CONTROL 0x00
/* demodulator unit subaddress */
#define I2C_MSP_DEM     0x10
/* DSP unit subaddress */
#define I2C_MSP_DSP     0x12


/* ----------------------------------------------------------------------- */
/* functions for talking to the MSP3400C Sound processor                   */

int msp_reset(struct i2c_client *client)
{
	/* reset and read revision code */
	static u8 reset_off[3] = { I2C_MSP_CONTROL, 0x80, 0x00 };
	static u8 reset_on[3]  = { I2C_MSP_CONTROL, 0x00, 0x00 };
	static u8 write[3]     = { I2C_MSP_DSP + 1, 0x00, 0x1e };
	u8 read[2];
	struct i2c_msg reset[2] = {
		{
			.addr = client->addr,
			.flags = I2C_M_IGNORE_NAK,
			.len = 3,
			.buf = reset_off
		},
		{
			.addr = client->addr,
			.flags = I2C_M_IGNORE_NAK,
			.len = 3,
			.buf = reset_on
		},
	};
	struct i2c_msg test[2] = {
		{
			.addr = client->addr,
			.len = 3,
			.buf = write
		},
		{
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = 2,
			.buf = read
		},
	};

	dev_dbg_lvl(&client->dev, 3, msp_debug, "msp_reset\n");
	if (i2c_transfer(client->adapter, &reset[0], 1) != 1 ||
	    i2c_transfer(client->adapter, &reset[1], 1) != 1 ||
	    i2c_transfer(client->adapter, test, 2) != 2) {
		dev_err(&client->dev, "chip reset failed\n");
		return -1;
	}
	return 0;
}

static int msp_read(struct i2c_client *client, int dev, int addr)
{
	int err, retval;
	u8 write[3];
	u8 read[2];
	struct i2c_msg msgs[2] = {
		{
			.addr = client->addr,
			.len = 3,
			.buf = write
		},
		{
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = 2,
			.buf = read
		}
	};

	write[0] = dev + 1;
	write[1] = addr >> 8;
	write[2] = addr & 0xff;

	for (err = 0; err < 3; err++) {
		if (i2c_transfer(client->adapter, msgs, 2) == 2)
			break;
		dev_warn(&client->dev, "I/O error #%d (read 0x%02x/0x%02x)\n", err,
		       dev, addr);
		schedule_timeout_interruptible(msecs_to_jiffies(10));
	}
	if (err == 3) {
		dev_warn(&client->dev, "resetting chip, sound will go off.\n");
		msp_reset(client);
		return -1;
	}
	retval = read[0] << 8 | read[1];
	dev_dbg_lvl(&client->dev, 3, msp_debug, "msp_read(0x%x, 0x%x): 0x%x\n",
			dev, addr, retval);
	return retval;
}

int msp_read_dem(struct i2c_client *client, int addr)
{
	return msp_read(client, I2C_MSP_DEM, addr);
}

int msp_read_dsp(struct i2c_client *client, int addr)
{
	return msp_read(client, I2C_MSP_DSP, addr);
}

static int msp_write(struct i2c_client *client, int dev, int addr, int val)
{
	int err;
	u8 buffer[5];

	buffer[0] = dev;
	buffer[1] = addr >> 8;
	buffer[2] = addr &  0xff;
	buffer[3] = val  >> 8;
	buffer[4] = val  &  0xff;

	dev_dbg_lvl(&client->dev, 3, msp_debug, "msp_write(0x%x, 0x%x, 0x%x)\n",
			dev, addr, val);
	for (err = 0; err < 3; err++) {
		if (i2c_master_send(client, buffer, 5) == 5)
			break;
		dev_warn(&client->dev, "I/O error #%d (write 0x%02x/0x%02x)\n", err,
		       dev, addr);
		schedule_timeout_interruptible(msecs_to_jiffies(10));
	}
	if (err == 3) {
		dev_warn(&client->dev, "resetting chip, sound will go off.\n");
		msp_reset(client);
		return -1;
	}
	return 0;
}

int msp_write_dem(struct i2c_client *client, int addr, int val)
{
	return msp_write(client, I2C_MSP_DEM, addr, val);
}

int msp_write_dsp(struct i2c_client *client, int addr, int val)
{
	return msp_write(client, I2C_MSP_DSP, addr, val);
}

/* ----------------------------------------------------------------------- *
 * bits  9  8  5 - SCART DSP input Select:
 *       0  0  0 - SCART 1 to DSP input (reset position)
 *       0  1  0 - MONO to DSP input
 *       1  0  0 - SCART 2 to DSP input
 *       1  1  1 - Mute DSP input
 *
 * bits 11 10  6 - SCART 1 Output Select:
 *       0  0  0 - undefined (reset position)
 *       0  1  0 - SCART 2 Input to SCART 1 Output (for devices with 2 SCARTS)
 *       1  0  0 - MONO input to SCART 1 Output
 *       1  1  0 - SCART 1 DA to SCART 1 Output
 *       0  0  1 - SCART 2 DA to SCART 1 Output
 *       0  1  1 - SCART 1 Input to SCART 1 Output
 *       1  1  1 - Mute SCART 1 Output
 *
 * bits 13 12  7 - SCART 2 Output Select (for devices with 2 Output SCART):
 *       0  0  0 - SCART 1 DA to SCART 2 Output (reset position)
 *       0  1  0 - SCART 1 Input to SCART 2 Output
 *       1  0  0 - MONO input to SCART 2 Output
 *       0  0  1 - SCART 2 DA to SCART 2 Output
 *       0  1  1 - SCART 2 Input to SCART 2 Output
 *       1  1  0 - Mute SCART 2 Output
 *
 * Bits 4 to 0 should be zero.
 * ----------------------------------------------------------------------- */

static int scarts[3][9] = {
	/* MASK   IN1     IN2     IN3     IN4     IN1_DA  IN2_DA  MONO    MUTE   */
	/* SCART DSP Input select */
	{ 0x0320, 0x0000, 0x0200, 0x0300, 0x0020, -1,     -1,     0x0100, 0x0320 },
	/* SCART1 Output select */
	{ 0x0c40, 0x0440, 0x0400, 0x0000, 0x0840, 0x0c00, 0x0040, 0x0800, 0x0c40 },
	/* SCART2 Output select */
	{ 0x3080, 0x1000, 0x1080, 0x2080, 0x3080, 0x0000, 0x0080, 0x2000, 0x3000 },
};

static char *scart_names[] = {
	"in1", "in2", "in3", "in4", "in1 da", "in2 da", "mono", "mute"
};

void msp_set_scart(struct i2c_client *client, int in, int out)
{
	struct msp_state *state = to_state(i2c_get_clientdata(client));

	state->in_scart = in;

	if (in >= 0 && in <= 7 && out >= 0 && out <= 2) {
		if (-1 == scarts[out][in + 1])
			return;

		state->acb &= ~scarts[out][0];
		state->acb |=  scarts[out][in + 1];
	} else
		state->acb = 0xf60; /* Mute Input and SCART 1 Output */

	dev_dbg_lvl(&client->dev, 1, msp_debug, "scart switch: %s => %d (ACB=0x%04x)\n",
					scart_names[in], out, state->acb);
	msp_write_dsp(client, 0x13, state->acb);

	/* Sets I2S speed 0 = 1.024 Mbps, 1 = 2.048 Mbps */
	if (state->has_i2s_conf)
		msp_write_dem(client, 0x40, state->i2s_mode);
}

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

static void msp_wake_thread(struct i2c_client *client)
{
	struct msp_state *state = to_state(i2c_get_clientdata(client));

	if (NULL == state->kthread)
		return;
	state->watch_stereo = 0;
	state->restart = 1;
	wake_up_interruptible(&state->wq);
}

int msp_sleep(struct msp_state *state, int timeout)
{
	DECLARE_WAITQUEUE(wait, current);

	add_wait_queue(&state->wq, &wait);
	if (!kthread_should_stop()) {
		if (timeout < 0) {
			set_current_state(TASK_INTERRUPTIBLE);
			schedule();
		} else {
			schedule_timeout_interruptible
						(msecs_to_jiffies(timeout));
		}
	}

	remove_wait_queue(&state->wq, &wait);
	try_to_freeze();
	return state->restart;
}

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

static int msp_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct msp_state *state = ctrl_to_state(ctrl);
	struct i2c_client *client = v4l2_get_subdevdata(&state->sd);
	int val = ctrl->val;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME: {
		/* audio volume cluster */
		int reallymuted = state->muted->val | state->scan_in_progress;

		if (!reallymuted)
			val = (val * 0x7f / 65535) << 8;

		dev_dbg_lvl(&client->dev, 1, msp_debug, "mute=%s scanning=%s volume=%d\n",
				state->muted->val ? "on" : "off",
				state->scan_in_progress ? "yes" : "no",
				state->volume->val);

		msp_write_dsp(client, 0x0000, val);
		msp_write_dsp(client, 0x0007, reallymuted ? 0x1 : (val | 0x1));
		if (state->has_scart2_out_volume)
			msp_write_dsp(client, 0x0040, reallymuted ? 0x1 : (val | 0x1));
		if (state->has_headphones)
			msp_write_dsp(client, 0x0006, val);
		break;
	}

	case V4L2_CID_AUDIO_BASS:
		val = ((val - 32768) * 0x60 / 65535) << 8;
		msp_write_dsp(client, 0x0002, val);
		if (state->has_headphones)
			msp_write_dsp(client, 0x0031, val);
		break;

	case V4L2_CID_AUDIO_TREBLE:
		val = ((val - 32768) * 0x60 / 65535) << 8;
		msp_write_dsp(client, 0x0003, val);
		if (state->has_headphones)
			msp_write_dsp(client, 0x0032, val);
		break;

	case V4L2_CID_AUDIO_LOUDNESS:
		val = val ? ((5 * 4) << 8) : 0;
		msp_write_dsp(client, 0x0004, val);
		if (state->has_headphones)
			msp_write_dsp(client, 0x0033, val);
		break;

	case V4L2_CID_AUDIO_BALANCE:
		val = (u8)((val / 256) - 128);
		msp_write_dsp(client, 0x0001, val << 8);
		if (state->has_headphones)
			msp_write_dsp(client, 0x0030, val << 8);
		break;

	default:
		return -EINVAL;
	}
	return 0;
}

void msp_update_volume(struct msp_state *state)
{
	/* Force an update of the volume/mute cluster */
	v4l2_ctrl_lock(state->volume);
	state->volume->val = state->volume->cur.val;
	state->muted->val = state->muted->cur.val;
	msp_s_ctrl(state->volume);
	v4l2_ctrl_unlock(state->volume);
}

/* --- v4l2 ioctls --- */
static int msp_s_radio(struct v4l2_subdev *sd)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (state->radio)
		return 0;
	state->radio = 1;
	dev_dbg_lvl(&client->dev, 1, msp_debug, "switching to radio mode\n");
	state->watch_stereo = 0;
	switch (state->opmode) {
	case OPMODE_MANUAL:
		/* set msp3400 to FM radio mode */
		msp3400c_set_mode(client, MSP_MODE_FM_RADIO);
		msp3400c_set_carrier(client, MSP_CARRIER(10.7),
				MSP_CARRIER(10.7));
		msp_update_volume(state);
		break;
	case OPMODE_AUTODETECT:
	case OPMODE_AUTOSELECT:
		/* the thread will do for us */
		msp_wake_thread(client);
		break;
	}
	return 0;
}

static int msp_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *freq)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	/* new channel -- kick audio carrier scan */
	msp_wake_thread(client);
	return 0;
}

static int msp_querystd(struct v4l2_subdev *sd, v4l2_std_id *id)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	*id &= state->detected_std;

	dev_dbg_lvl(&client->dev, 2, msp_debug,
		"detected standard: %s(0x%08Lx)\n",
		msp_standard_std_name(state->std), state->detected_std);

	return 0;
}

static int msp_s_std(struct v4l2_subdev *sd, v4l2_std_id id)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int update = state->radio || state->v4l2_std != id;

	state->v4l2_std = id;
	state->radio = 0;
	if (update)
		msp_wake_thread(client);
	return 0;
}

static int msp_s_routing(struct v4l2_subdev *sd,
			 u32 input, u32 output, u32 config)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int tuner = (input >> 3) & 1;
	int sc_in = input & 0x7;
	int sc1_out = output & 0xf;
	int sc2_out = (output >> 4) & 0xf;
	u16 val, reg;
	int i;
	int extern_input = 1;

	if (state->route_in == input && state->route_out == output)
		return 0;
	state->route_in = input;
	state->route_out = output;
	/* check if the tuner input is used */
	for (i = 0; i < 5; i++) {
		if (((input >> (4 + i * 4)) & 0xf) == 0)
			extern_input = 0;
	}
	state->mode = extern_input ? MSP_MODE_EXTERN : MSP_MODE_AM_DETECT;
	state->rxsubchans = V4L2_TUNER_SUB_STEREO;
	msp_set_scart(client, sc_in, 0);
	msp_set_scart(client, sc1_out, 1);
	msp_set_scart(client, sc2_out, 2);
	msp_set_audmode(client);
	reg = (state->opmode == OPMODE_AUTOSELECT) ? 0x30 : 0xbb;
	val = msp_read_dem(client, reg);
	msp_write_dem(client, reg, (val & ~0x100) | (tuner << 8));
	/* wake thread when a new input is chosen */
	msp_wake_thread(client);
	return 0;
}

static int msp_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (vt->type != V4L2_TUNER_ANALOG_TV)
		return 0;
	if (!state->radio) {
		if (state->opmode == OPMODE_AUTOSELECT)
			msp_detect_stereo(client);
		vt->rxsubchans = state->rxsubchans;
	}
	vt->audmode = state->audmode;
	vt->capability |= V4L2_TUNER_CAP_STEREO |
		V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
	return 0;
}

static int msp_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (state->radio)  /* TODO: add mono/stereo support for radio */
		return 0;
	if (state->audmode == vt->audmode)
		return 0;
	state->audmode = vt->audmode;
	/* only set audmode */
	msp_set_audmode(client);
	return 0;
}

static int msp_s_i2s_clock_freq(struct v4l2_subdev *sd, u32 freq)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	dev_dbg_lvl(&client->dev, 1, msp_debug, "Setting I2S speed to %d\n", freq);

	switch (freq) {
		case 1024000:
			state->i2s_mode = 0;
			break;
		case 2048000:
			state->i2s_mode = 1;
			break;
		default:
			return -EINVAL;
	}
	return 0;
}

static int msp_log_status(struct v4l2_subdev *sd)
{
	struct msp_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	const char *p;
	char prefix[V4L2_SUBDEV_NAME_SIZE + 20];

	if (state->opmode == OPMODE_AUTOSELECT)
		msp_detect_stereo(client);
	dev_info(&client->dev, "%s rev1 = 0x%04x rev2 = 0x%04x\n",
			client->name, state->rev1, state->rev2);
	snprintf(prefix, sizeof(prefix), "%s: Audio:    ", sd->name);
	v4l2_ctrl_handler_log_status(&state->hdl, prefix);
	switch (state->mode) {
		case MSP_MODE_AM_DETECT: p = "AM (for carrier detect)"; break;
		case MSP_MODE_FM_RADIO: p = "FM Radio"; break;
		case MSP_MODE_FM_TERRA: p = "Terrestrial FM-mono/stereo"; break;
		case MSP_MODE_FM_SAT: p = "Satellite FM-mono"; break;
		case MSP_MODE_FM_NICAM1: p = "NICAM/FM (B/G, D/K)"; break;
		case MSP_MODE_FM_NICAM2: p = "NICAM/FM (I)"; break;
		case MSP_MODE_AM_NICAM: p = "NICAM/AM (L)"; break;
		case MSP_MODE_BTSC: p = "BTSC"; break;
		case MSP_MODE_EXTERN: p = "External input"; break;
		default: p = "unknown"; break;
	}
	if (state->mode == MSP_MODE_EXTERN) {
		dev_info(&client->dev, "Mode:     %s\n", p);
	} else if (state->opmode == OPMODE_MANUAL) {
		dev_info(&client->dev, "Mode:     %s (%s%s)\n", p,
				(state->rxsubchans & V4L2_TUNER_SUB_STEREO) ? "stereo" : "mono",
				(state->rxsubchans & V4L2_TUNER_SUB_LANG2) ? ", dual" : "");
	} else {
		if (state->opmode == OPMODE_AUTODETECT)
			dev_info(&client->dev, "Mode:     %s\n", p);
		dev_info(&client->dev, "Standard: %s (%s%s)\n",
				msp_standard_std_name(state->std),
				(state->rxsubchans & V4L2_TUNER_SUB_STEREO) ? "stereo" : "mono",
				(state->rxsubchans & V4L2_TUNER_SUB_LANG2) ? ", dual" : "");
	}
	dev_info(&client->dev, "Audmode:  0x%04x\n", state->audmode);
	dev_info(&client->dev, "Routing:  0x%08x (input) 0x%08x (output)\n",
			state->route_in, state->route_out);
	dev_info(&client->dev, "ACB:      0x%04x\n", state->acb);
	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int msp_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	dev_dbg_lvl(&client->dev, 1, msp_debug, "suspend\n");
	msp_reset(client);
	return 0;
}

static int msp_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	dev_dbg_lvl(&client->dev, 1, msp_debug, "resume\n");
	msp_wake_thread(client);
	return 0;
}
#endif

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

static const struct v4l2_ctrl_ops msp_ctrl_ops = {
	.s_ctrl = msp_s_ctrl,
};

static const struct v4l2_subdev_core_ops msp_core_ops = {
	.log_status = msp_log_status,
};

static const struct v4l2_subdev_video_ops msp_video_ops = {
	.s_std = msp_s_std,
	.querystd = msp_querystd,
};

static const struct v4l2_subdev_tuner_ops msp_tuner_ops = {
	.s_frequency = msp_s_frequency,
	.g_tuner = msp_g_tuner,
	.s_tuner = msp_s_tuner,
	.s_radio = msp_s_radio,
};

static const struct v4l2_subdev_audio_ops msp_audio_ops = {
	.s_routing = msp_s_routing,
	.s_i2s_clock_freq = msp_s_i2s_clock_freq,
};

static const struct v4l2_subdev_ops msp_ops = {
	.core = &msp_core_ops,
	.video = &msp_video_ops,
	.tuner = &msp_tuner_ops,
	.audio = &msp_audio_ops,
};

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


static const char * const opmode_str[] = {
	[OPMODE_MANUAL] = "manual",
	[OPMODE_AUTODETECT] = "autodetect",
	[OPMODE_AUTOSELECT] = "autodetect and autoselect",
};

static int msp_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct msp_state *state;
	struct v4l2_subdev *sd;
	struct v4l2_ctrl_handler *hdl;
	int (*thread_func)(void *data) = NULL;
	int msp_hard;
	int msp_family;
	int msp_revision;
	int msp_product, msp_prod_hi, msp_prod_lo;
	int msp_rom;
#if defined(CONFIG_MEDIA_CONTROLLER)
	int ret;
#endif

	if (!id)
		strscpy(client->name, "msp3400", sizeof(client->name));

	if (msp_reset(client) == -1) {
		dev_dbg_lvl(&client->dev, 1, msp_debug, "msp3400 not found\n");
		return -ENODEV;
	}

	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
	if (!state)
		return -ENOMEM;

	sd = &state->sd;
	v4l2_i2c_subdev_init(sd, client, &msp_ops);

#if defined(CONFIG_MEDIA_CONTROLLER)
	state->pads[MSP3400_PAD_IF_INPUT].flags = MEDIA_PAD_FL_SINK;
	state->pads[MSP3400_PAD_IF_INPUT].sig_type = PAD_SIGNAL_AUDIO;
	state->pads[MSP3400_PAD_OUT].flags = MEDIA_PAD_FL_SOURCE;
	state->pads[MSP3400_PAD_OUT].sig_type = PAD_SIGNAL_AUDIO;

	sd->entity.function = MEDIA_ENT_F_IF_AUD_DECODER;

	ret = media_entity_pads_init(&sd->entity, 2, state->pads);
	if (ret < 0)
		return ret;
#endif

	state->v4l2_std = V4L2_STD_NTSC;
	state->detected_std = V4L2_STD_ALL;
	state->audmode = V4L2_TUNER_MODE_STEREO;
	state->input = -1;
	state->i2s_mode = 0;
	init_waitqueue_head(&state->wq);
	/* These are the reset input/output positions */
	state->route_in = MSP_INPUT_DEFAULT;
	state->route_out = MSP_OUTPUT_DEFAULT;

	state->rev1 = msp_read_dsp(client, 0x1e);
	if (state->rev1 != -1)
		state->rev2 = msp_read_dsp(client, 0x1f);
	dev_dbg_lvl(&client->dev, 1, msp_debug, "rev1=0x%04x, rev2=0x%04x\n",
			state->rev1, state->rev2);
	if (state->rev1 == -1 || (state->rev1 == 0 && state->rev2 == 0)) {
		dev_dbg_lvl(&client->dev, 1, msp_debug,
				"not an msp3400 (cannot read chip version)\n");
		return -ENODEV;
	}

	msp_family = ((state->rev1 >> 4) & 0x0f) + 3;
	msp_product = (state->rev2 >> 8) & 0xff;
	msp_prod_hi = msp_product / 10;
	msp_prod_lo = msp_product % 10;
	msp_revision = (state->rev1 & 0x0f) + '@';
	msp_hard = ((state->rev1 >> 8) & 0xff) + '@';
	msp_rom = state->rev2 & 0x1f;
	/* Rev B=2, C=3, D=4, G=7 */
	state->ident = msp_family * 10000 + 4000 + msp_product * 10 +
			msp_revision - '@';

	/* Has NICAM support: all mspx41x and mspx45x products have NICAM */
	state->has_nicam =
		msp_prod_hi == 1 || msp_prod_hi == 5;
	/* Has radio support: was added with revision G */
	state->has_radio =
		msp_revision >= 'G';
	/* Has headphones output: not for stripped down products */
	state->has_headphones =
		msp_prod_lo < 5;
	/* Has scart2 input: not in stripped down products of the '3' family */
	state->has_scart2 =
		msp_family >= 4 || msp_prod_lo < 7;
	/* Has scart3 input: not in stripped down products of the '3' family */
	state->has_scart3 =
		msp_family >= 4 || msp_prod_lo < 5;
	/* Has scart4 input: not in pre D revisions, not in stripped D revs */
	state->has_scart4 =
		msp_family >= 4 || (msp_revision >= 'D' && msp_prod_lo < 5);
	/* Has scart2 output: not in stripped down products of
	 * the '3' family */
	state->has_scart2_out =
		msp_family >= 4 || msp_prod_lo < 5;
	/* Has scart2 a volume control? Not in pre-D revisions. */
	state->has_scart2_out_volume =
		msp_revision > 'C' && state->has_scart2_out;
	/* Has a configurable i2s out? */
	state->has_i2s_conf =
		msp_revision >= 'G' && msp_prod_lo < 7;
	/* Has subwoofer output: not in pre-D revs and not in stripped down
	 * products */
	state->has_subwoofer =
		msp_revision >= 'D' && msp_prod_lo < 5;
	/* Has soundprocessing (bass/treble/balance/loudness/equalizer):
	 *  not in stripped down products */
	state->has_sound_processing =
		msp_prod_lo < 7;
	/* Has Virtual Dolby Surround: only in msp34x1 */
	state->has_virtual_dolby_surround =
		msp_revision == 'G' && msp_prod_lo == 1;
	/* Has Virtual Dolby Surround & Dolby Pro Logic: only in msp34x2 */
	state->has_dolby_pro_logic =
		msp_revision == 'G' && msp_prod_lo == 2;
	/* The msp343xG supports BTSC only and cannot do Automatic Standard
	 * Detection. */
	state->force_btsc =
		msp_family == 3 && msp_revision == 'G' && msp_prod_hi == 3;

	state->opmode = opmode;
	if (state->opmode < OPMODE_MANUAL
	    || state->opmode > OPMODE_AUTOSELECT) {
		/* MSP revision G and up have both autodetect and autoselect */
		if (msp_revision >= 'G')
			state->opmode = OPMODE_AUTOSELECT;
		/* MSP revision D and up have autodetect */
		else if (msp_revision >= 'D')
			state->opmode = OPMODE_AUTODETECT;
		else
			state->opmode = OPMODE_MANUAL;
	}

	hdl = &state->hdl;
	v4l2_ctrl_handler_init(hdl, 6);
	if (state->has_sound_processing) {
		v4l2_ctrl_new_std(hdl, &msp_ctrl_ops,
			V4L2_CID_AUDIO_BASS, 0, 65535, 65535 / 100, 32768);
		v4l2_ctrl_new_std(hdl, &msp_ctrl_ops,
			V4L2_CID_AUDIO_TREBLE, 0, 65535, 65535 / 100, 32768);
		v4l2_ctrl_new_std(hdl, &msp_ctrl_ops,
			V4L2_CID_AUDIO_LOUDNESS, 0, 1, 1, 0);
	}
	state->volume = v4l2_ctrl_new_std(hdl, &msp_ctrl_ops,
			V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 58880);
	v4l2_ctrl_new_std(hdl, &msp_ctrl_ops,
			V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
	state->muted = v4l2_ctrl_new_std(hdl, &msp_ctrl_ops,
			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
	sd->ctrl_handler = hdl;
	if (hdl->error) {
		int err = hdl->error;

		v4l2_ctrl_handler_free(hdl);
		return err;
	}

	v4l2_ctrl_cluster(2, &state->volume);
	v4l2_ctrl_handler_setup(hdl);

	dev_info(&client->dev,
		 "MSP%d4%02d%c-%c%d found on %s: supports %s%s%s, mode is %s\n",
		 msp_family, msp_product,
		 msp_revision, msp_hard, msp_rom,
		 client->adapter->name,
		 (state->has_nicam) ? "nicam" : "",
		 (state->has_nicam && state->has_radio) ? " and " : "",
		 (state->has_radio) ? "radio" : "",
		 opmode_str[state->opmode]);

	/* version-specific initialization */
	switch (state->opmode) {
	case OPMODE_MANUAL:
		thread_func = msp3400c_thread;
		break;
	case OPMODE_AUTODETECT:
		thread_func = msp3410d_thread;
		break;
	case OPMODE_AUTOSELECT:
		thread_func = msp34xxg_thread;
		break;
	}

	/* startup control thread if needed */
	if (thread_func) {
		state->kthread = kthread_run(thread_func, client, "msp34xx");

		if (IS_ERR(state->kthread))
			dev_warn(&client->dev, "kernel_thread() failed\n");
		msp_wake_thread(client);
	}
	return 0;
}

static int msp_remove(struct i2c_client *client)
{
	struct msp_state *state = to_state(i2c_get_clientdata(client));

	v4l2_device_unregister_subdev(&state->sd);
	/* shutdown control thread */
	if (state->kthread) {
		state->restart = 1;
		kthread_stop(state->kthread);
	}
	msp_reset(client);

	v4l2_ctrl_handler_free(&state->hdl);
	return 0;
}

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

static const struct dev_pm_ops msp3400_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(msp_suspend, msp_resume)
};

static const struct i2c_device_id msp_id[] = {
	{ "msp3400", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, msp_id);

static struct i2c_driver msp_driver = {
	.driver = {
		.name	= "msp3400",
		.pm	= &msp3400_pm_ops,
	},
	.probe		= msp_probe,
	.remove		= msp_remove,
	.id_table	= msp_id,
};

module_i2c_driver(msp_driver);