drivers/media/video/saa7134/saa6752hs.c

 /*
    saa6752hs - i2c-driver for the saa6752hs by Philips

    Copyright (C) 2004 Andrew de Quincey

    AC-3 support:

    Copyright (C) 2008 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 vs 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., 675 Mvss Ave, Cambridge, MA 02139, USA.
  */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-common.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-i2c-drv-legacy.h>
#include <linux/init.h>
#include <linux/crc32.h>

#define MPEG_VIDEO_TARGET_BITRATE_MAX  27000
#define MPEG_VIDEO_MAX_BITRATE_MAX     27000
#define MPEG_TOTAL_TARGET_BITRATE_MAX  27000
#define MPEG_PID_MAX ((1 << 14) - 1)

/* Addresses to scan */
static unsigned short normal_i2c[] = {0x20, I2C_CLIENT_END};

I2C_CLIENT_INSMOD;

MODULE_DESCRIPTION("device driver for saa6752hs MPEG2 encoder");
MODULE_AUTHOR("Andrew de Quincey");
MODULE_LICENSE("GPL");

enum saa6752hs_videoformat {
	SAA6752HS_VF_D1 = 0,    /* standard D1 video format: 720x576 */
	SAA6752HS_VF_2_3_D1 = 1,/* 2/3D1 video format: 480x576 */
	SAA6752HS_VF_1_2_D1 = 2,/* 1/2D1 video format: 352x576 */
	SAA6752HS_VF_SIF = 3,   /* SIF video format: 352x288 */
	SAA6752HS_VF_UNKNOWN,
};

struct saa6752hs_mpeg_params {
	/* transport streams */
	__u16				ts_pid_pmt;
	__u16				ts_pid_audio;
	__u16				ts_pid_video;
	__u16				ts_pid_pcr;

	/* audio */
	enum v4l2_mpeg_audio_encoding    au_encoding;
	enum v4l2_mpeg_audio_l2_bitrate  au_l2_bitrate;
	enum v4l2_mpeg_audio_ac3_bitrate au_ac3_bitrate;

	/* video */
	enum v4l2_mpeg_video_aspect	vi_aspect;
	enum v4l2_mpeg_video_bitrate_mode vi_bitrate_mode;
	__u32 				vi_bitrate;
	__u32 				vi_bitrate_peak;
};

static const struct v4l2_format v4l2_format_table[] =
{
	[SAA6752HS_VF_D1] =
		{ .fmt = { .pix = { .width = 720, .height = 576 }}},
	[SAA6752HS_VF_2_3_D1] =
		{ .fmt = { .pix = { .width = 480, .height = 576 }}},
	[SAA6752HS_VF_1_2_D1] =
		{ .fmt = { .pix = { .width = 352, .height = 576 }}},
	[SAA6752HS_VF_SIF] =
		{ .fmt = { .pix = { .width = 352, .height = 288 }}},
	[SAA6752HS_VF_UNKNOWN] =
		{ .fmt = { .pix = { .width = 0, .height = 0}}},
};

struct saa6752hs_state {
	struct v4l2_subdev            sd;
	int 			      chip;
	u32 			      revision;
	int 			      has_ac3;
	struct saa6752hs_mpeg_params  params;
	enum saa6752hs_videoformat    video_format;
	v4l2_std_id                   standard;
};

enum saa6752hs_command {
	SAA6752HS_COMMAND_RESET = 0,
	SAA6752HS_COMMAND_STOP = 1,
	SAA6752HS_COMMAND_START = 2,
	SAA6752HS_COMMAND_PAUSE = 3,
	SAA6752HS_COMMAND_RECONFIGURE = 4,
	SAA6752HS_COMMAND_SLEEP = 5,
	SAA6752HS_COMMAND_RECONFIGURE_FORCE = 6,

	SAA6752HS_COMMAND_MAX
};

static inline struct saa6752hs_state *to_state(struct v4l2_subdev *sd)
{
	return container_of(sd, struct saa6752hs_state, sd);
}

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

static u8 PAT[] = {
	0xc2, /* i2c register */
	0x00, /* table number for encoder */

	0x47, /* sync */
	0x40, 0x00, /* transport_error_indicator(0), payload_unit_start(1), transport_priority(0), pid(0) */
	0x10, /* transport_scrambling_control(00), adaptation_field_control(01), continuity_counter(0) */

	0x00, /* PSI pointer to start of table */

	0x00, /* tid(0) */
	0xb0, 0x0d, /* section_syntax_indicator(1), section_length(13) */

	0x00, 0x01, /* transport_stream_id(1) */

	0xc1, /* version_number(0), current_next_indicator(1) */

	0x00, 0x00, /* section_number(0), last_section_number(0) */

	0x00, 0x01, /* program_number(1) */

	0xe0, 0x00, /* PMT PID */

	0x00, 0x00, 0x00, 0x00 /* CRC32 */
};

static u8 PMT[] = {
	0xc2, /* i2c register */
	0x01, /* table number for encoder */

	0x47, /* sync */
	0x40, 0x00, /* transport_error_indicator(0), payload_unit_start(1), transport_priority(0), pid */
	0x10, /* transport_scrambling_control(00), adaptation_field_control(01), continuity_counter(0) */

	0x00, /* PSI pointer to start of table */

	0x02, /* tid(2) */
	0xb0, 0x17, /* section_syntax_indicator(1), section_length(23) */

	0x00, 0x01, /* program_number(1) */

	0xc1, /* version_number(0), current_next_indicator(1) */

	0x00, 0x00, /* section_number(0), last_section_number(0) */

	0xe0, 0x00, /* PCR_PID */

	0xf0, 0x00, /* program_info_length(0) */

	0x02, 0xe0, 0x00, 0xf0, 0x00, /* video stream type(2), pid */
	0x04, 0xe0, 0x00, 0xf0, 0x00, /* audio stream type(4), pid */

	0x00, 0x00, 0x00, 0x00 /* CRC32 */
};

static u8 PMT_AC3[] = {
	0xc2, /* i2c register */
	0x01, /* table number for encoder(1) */
	0x47, /* sync */

	0x40, /* transport_error_indicator(0), payload_unit_start(1), transport_priority(0) */
	0x10, /* PMT PID (0x0010) */
	0x10, /* transport_scrambling_control(00), adaptation_field_control(01), continuity_counter(0) */

	0x00, /* PSI pointer to start of table */

	0x02, /* TID (2) */
	0xb0, 0x1a, /* section_syntax_indicator(1), section_length(26) */

	0x00, 0x01, /* program_number(1) */

	0xc1, /* version_number(0), current_next_indicator(1) */

	0x00, 0x00, /* section_number(0), last_section_number(0) */

	0xe1, 0x04, /* PCR_PID (0x0104) */

	0xf0, 0x00, /* program_info_length(0) */

	0x02, 0xe1, 0x00, 0xf0, 0x00, /* video stream type(2), pid */
	0x06, 0xe1, 0x03, 0xf0, 0x03, /* audio stream type(6), pid */
	0x6a, /* AC3 */
	0x01, /* Descriptor_length(1) */
	0x00, /* component_type_flag(0), bsid_flag(0), mainid_flag(0), asvc_flag(0), reserved flags(0) */

	0xED, 0xDE, 0x2D, 0xF3 /* CRC32 BE */
};

static struct saa6752hs_mpeg_params param_defaults =
{
	.ts_pid_pmt      = 16,
	.ts_pid_video    = 260,
	.ts_pid_audio    = 256,
	.ts_pid_pcr      = 259,

	.vi_aspect       = V4L2_MPEG_VIDEO_ASPECT_4x3,
	.vi_bitrate      = 4000,
	.vi_bitrate_peak = 6000,
	.vi_bitrate_mode = V4L2_MPEG_VIDEO_BITRATE_MODE_VBR,

	.au_encoding     = V4L2_MPEG_AUDIO_ENCODING_LAYER_2,
	.au_l2_bitrate   = V4L2_MPEG_AUDIO_L2_BITRATE_256K,
	.au_ac3_bitrate  = V4L2_MPEG_AUDIO_AC3_BITRATE_256K,
};

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

static int saa6752hs_chip_command(struct i2c_client *client,
				  enum saa6752hs_command command)
{
	unsigned char buf[3];
	unsigned long timeout;
	int status = 0;

	/* execute the command */
	switch(command) {
	case SAA6752HS_COMMAND_RESET:
		buf[0] = 0x00;
		break;

	case SAA6752HS_COMMAND_STOP:
		buf[0] = 0x03;
		break;

	case SAA6752HS_COMMAND_START:
		buf[0] = 0x02;
		break;

	case SAA6752HS_COMMAND_PAUSE:
		buf[0] = 0x04;
		break;

	case SAA6752HS_COMMAND_RECONFIGURE:
		buf[0] = 0x05;
		break;

	case SAA6752HS_COMMAND_SLEEP:
		buf[0] = 0x06;
		break;

	case SAA6752HS_COMMAND_RECONFIGURE_FORCE:
		buf[0] = 0x07;
		break;

	default:
		return -EINVAL;
	}

	/* set it and wait for it to be so */
	i2c_master_send(client, buf, 1);
	timeout = jiffies + HZ * 3;
	for (;;) {
		/* get the current status */
		buf[0] = 0x10;
		i2c_master_send(client, buf, 1);
		i2c_master_recv(client, buf, 1);

		if (!(buf[0] & 0x20))
			break;
		if (time_after(jiffies,timeout)) {
			status = -ETIMEDOUT;
			break;
		}

		msleep(10);
	}

	/* delay a bit to let encoder settle */
	msleep(50);

	return status;
}


static inline void set_reg8(struct i2c_client *client, uint8_t reg, uint8_t val)
{
	u8 buf[2];

	buf[0] = reg;
	buf[1] = val;
	i2c_master_send(client, buf, 2);
}

static inline void set_reg16(struct i2c_client *client, uint8_t reg, uint16_t val)
{
	u8 buf[3];

	buf[0] = reg;
	buf[1] = val >> 8;
	buf[2] = val & 0xff;
	i2c_master_send(client, buf, 3);
}

static int saa6752hs_set_bitrate(struct i2c_client *client,
				 struct saa6752hs_state *h)
{
	struct saa6752hs_mpeg_params *params = &h->params;
	int tot_bitrate;
	int is_384k;

	/* set the bitrate mode */
	set_reg8(client, 0x71,
		params->vi_bitrate_mode != V4L2_MPEG_VIDEO_BITRATE_MODE_VBR);

	/* set the video bitrate */
	if (params->vi_bitrate_mode == V4L2_MPEG_VIDEO_BITRATE_MODE_VBR) {
		/* set the target bitrate */
		set_reg16(client, 0x80, params->vi_bitrate);

		/* set the max bitrate */
		set_reg16(client, 0x81, params->vi_bitrate_peak);
		tot_bitrate = params->vi_bitrate_peak;
	} else {
		/* set the target bitrate (no max bitrate for CBR) */
		set_reg16(client, 0x81, params->vi_bitrate);
		tot_bitrate = params->vi_bitrate;
	}

	/* set the audio encoding */
	set_reg8(client, 0x93,
			params->au_encoding == V4L2_MPEG_AUDIO_ENCODING_AC3);

	/* set the audio bitrate */
	if (params->au_encoding == V4L2_MPEG_AUDIO_ENCODING_AC3)
		is_384k = V4L2_MPEG_AUDIO_AC3_BITRATE_384K == params->au_ac3_bitrate;
	else
		is_384k = V4L2_MPEG_AUDIO_L2_BITRATE_384K == params->au_l2_bitrate;
	set_reg8(client, 0x94, is_384k);
	tot_bitrate += is_384k ? 384 : 256;

	/* Note: the total max bitrate is determined by adding the video and audio
	   bitrates together and also adding an extra 768kbit/s to stay on the
	   safe side. If more control should be required, then an extra MPEG control
	   should be added. */
	tot_bitrate += 768;
	if (tot_bitrate > MPEG_TOTAL_TARGET_BITRATE_MAX)
		tot_bitrate = MPEG_TOTAL_TARGET_BITRATE_MAX;

	/* set the total bitrate */
	set_reg16(client, 0xb1, tot_bitrate);
	return 0;
}


static int get_ctrl(int has_ac3, struct saa6752hs_mpeg_params *params,
		struct v4l2_ext_control *ctrl)
{
	switch (ctrl->id) {
	case V4L2_CID_MPEG_STREAM_TYPE:
		ctrl->value = V4L2_MPEG_STREAM_TYPE_MPEG2_TS;
		break;
	case V4L2_CID_MPEG_STREAM_PID_PMT:
		ctrl->value = params->ts_pid_pmt;
		break;
	case V4L2_CID_MPEG_STREAM_PID_AUDIO:
		ctrl->value = params->ts_pid_audio;
		break;
	case V4L2_CID_MPEG_STREAM_PID_VIDEO:
		ctrl->value = params->ts_pid_video;
		break;
	case V4L2_CID_MPEG_STREAM_PID_PCR:
		ctrl->value = params->ts_pid_pcr;
		break;
	case V4L2_CID_MPEG_AUDIO_ENCODING:
		ctrl->value = params->au_encoding;
		break;
	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
		ctrl->value = params->au_l2_bitrate;
		break;
	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
		if (!has_ac3)
			return -EINVAL;
		ctrl->value = params->au_ac3_bitrate;
		break;
	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
		ctrl->value = V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000;
		break;
	case V4L2_CID_MPEG_VIDEO_ENCODING:
		ctrl->value = V4L2_MPEG_VIDEO_ENCODING_MPEG_2;
		break;
	case V4L2_CID_MPEG_VIDEO_ASPECT:
		ctrl->value = params->vi_aspect;
		break;
	case V4L2_CID_MPEG_VIDEO_BITRATE:
		ctrl->value = params->vi_bitrate * 1000;
		break;
	case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
		ctrl->value = params->vi_bitrate_peak * 1000;
		break;
	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
		ctrl->value = params->vi_bitrate_mode;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int handle_ctrl(int has_ac3, struct saa6752hs_mpeg_params *params,
		struct v4l2_ext_control *ctrl, int set)
{
	int old = 0, new;

	new = ctrl->value;
	switch (ctrl->id) {
	case V4L2_CID_MPEG_STREAM_TYPE:
		old = V4L2_MPEG_STREAM_TYPE_MPEG2_TS;
		if (set && new != old)
			return -ERANGE;
		new = old;
		break;
	case V4L2_CID_MPEG_STREAM_PID_PMT:
		old = params->ts_pid_pmt;
		if (set && new > MPEG_PID_MAX)
			return -ERANGE;
		if (new > MPEG_PID_MAX)
			new = MPEG_PID_MAX;
		params->ts_pid_pmt = new;
		break;
	case V4L2_CID_MPEG_STREAM_PID_AUDIO:
		old = params->ts_pid_audio;
		if (set && new > MPEG_PID_MAX)
			return -ERANGE;
		if (new > MPEG_PID_MAX)
			new = MPEG_PID_MAX;
		params->ts_pid_audio = new;
		break;
	case V4L2_CID_MPEG_STREAM_PID_VIDEO:
		old = params->ts_pid_video;
		if (set && new > MPEG_PID_MAX)
			return -ERANGE;
		if (new > MPEG_PID_MAX)
			new = MPEG_PID_MAX;
		params->ts_pid_video = new;
		break;
	case V4L2_CID_MPEG_STREAM_PID_PCR:
		old = params->ts_pid_pcr;
		if (set && new > MPEG_PID_MAX)
			return -ERANGE;
		if (new > MPEG_PID_MAX)
			new = MPEG_PID_MAX;
		params->ts_pid_pcr = new;
		break;
	case V4L2_CID_MPEG_AUDIO_ENCODING:
		old = params->au_encoding;
		if (set && new != V4L2_MPEG_AUDIO_ENCODING_LAYER_2 &&
		    (!has_ac3 || new != V4L2_MPEG_AUDIO_ENCODING_AC3))
			return -ERANGE;
		new = old;
		break;
	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
		old = params->au_l2_bitrate;
		if (set && new != V4L2_MPEG_AUDIO_L2_BITRATE_256K &&
			   new != V4L2_MPEG_AUDIO_L2_BITRATE_384K)
			return -ERANGE;
		if (new <= V4L2_MPEG_AUDIO_L2_BITRATE_256K)
			new = V4L2_MPEG_AUDIO_L2_BITRATE_256K;
		else
			new = V4L2_MPEG_AUDIO_L2_BITRATE_384K;
		params->au_l2_bitrate = new;
		break;
	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
		if (!has_ac3)
			return -EINVAL;
		old = params->au_ac3_bitrate;
		if (set && new != V4L2_MPEG_AUDIO_AC3_BITRATE_256K &&
			   new != V4L2_MPEG_AUDIO_AC3_BITRATE_384K)
			return -ERANGE;
		if (new <= V4L2_MPEG_AUDIO_AC3_BITRATE_256K)
			new = V4L2_MPEG_AUDIO_AC3_BITRATE_256K;
		else
			new = V4L2_MPEG_AUDIO_AC3_BITRATE_384K;
		params->au_ac3_bitrate = new;
		break;
	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
		old = V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000;
		if (set && new != old)
			return -ERANGE;
		new = old;
		break;
	case V4L2_CID_MPEG_VIDEO_ENCODING:
		old = V4L2_MPEG_VIDEO_ENCODING_MPEG_2;
		if (set && new != old)
			return -ERANGE;
		new = old;
		break;
	case V4L2_CID_MPEG_VIDEO_ASPECT:
		old = params->vi_aspect;
		if (set && new != V4L2_MPEG_VIDEO_ASPECT_16x9 &&
			   new != V4L2_MPEG_VIDEO_ASPECT_4x3)
			return -ERANGE;
		if (new != V4L2_MPEG_VIDEO_ASPECT_16x9)
			new = V4L2_MPEG_VIDEO_ASPECT_4x3;
		params->vi_aspect = new;
		break;
	case V4L2_CID_MPEG_VIDEO_BITRATE:
		old = params->vi_bitrate * 1000;
		new = 1000 * (new / 1000);
		if (set && new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
			return -ERANGE;
		if (new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
			new = MPEG_VIDEO_TARGET_BITRATE_MAX * 1000;
		params->vi_bitrate = new / 1000;
		break;
	case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
		old = params->vi_bitrate_peak * 1000;
		new = 1000 * (new / 1000);
		if (set && new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
			return -ERANGE;
		if (new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
			new = MPEG_VIDEO_TARGET_BITRATE_MAX * 1000;
		params->vi_bitrate_peak = new / 1000;
		break;
	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
		old = params->vi_bitrate_mode;
		params->vi_bitrate_mode = new;
		break;
	default:
		return -EINVAL;
	}
	ctrl->value = new;
	return 0;
}


static int saa6752hs_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qctrl)
{
	struct saa6752hs_state *h = to_state(sd);
	struct saa6752hs_mpeg_params *params = &h->params;
	int err;

	switch (qctrl->id) {
	case V4L2_CID_MPEG_AUDIO_ENCODING:
		return v4l2_ctrl_query_fill(qctrl,
				V4L2_MPEG_AUDIO_ENCODING_LAYER_2,
				h->has_ac3 ? V4L2_MPEG_AUDIO_ENCODING_AC3 :
					V4L2_MPEG_AUDIO_ENCODING_LAYER_2,
				1, V4L2_MPEG_AUDIO_ENCODING_LAYER_2);

	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
		return v4l2_ctrl_query_fill(qctrl,
				V4L2_MPEG_AUDIO_L2_BITRATE_256K,
				V4L2_MPEG_AUDIO_L2_BITRATE_384K, 1,
				V4L2_MPEG_AUDIO_L2_BITRATE_256K);

	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
		if (!h->has_ac3)
			return -EINVAL;
		return v4l2_ctrl_query_fill(qctrl,
				V4L2_MPEG_AUDIO_AC3_BITRATE_256K,
				V4L2_MPEG_AUDIO_AC3_BITRATE_384K, 1,
				V4L2_MPEG_AUDIO_AC3_BITRATE_256K);

	case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
		return v4l2_ctrl_query_fill(qctrl,
				V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000,
				V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000, 1,
				V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000);

	case V4L2_CID_MPEG_VIDEO_ENCODING:
		return v4l2_ctrl_query_fill(qctrl,
				V4L2_MPEG_VIDEO_ENCODING_MPEG_2,
				V4L2_MPEG_VIDEO_ENCODING_MPEG_2, 1,
				V4L2_MPEG_VIDEO_ENCODING_MPEG_2);

	case V4L2_CID_MPEG_VIDEO_ASPECT:
		return v4l2_ctrl_query_fill(qctrl,
				V4L2_MPEG_VIDEO_ASPECT_4x3,
				V4L2_MPEG_VIDEO_ASPECT_16x9, 1,
				V4L2_MPEG_VIDEO_ASPECT_4x3);

	case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
		err = v4l2_ctrl_query_fill_std(qctrl);
		if (err == 0 &&
		    params->vi_bitrate_mode ==
				V4L2_MPEG_VIDEO_BITRATE_MODE_CBR)
			qctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
		return err;

	case V4L2_CID_MPEG_STREAM_TYPE:
		return v4l2_ctrl_query_fill(qctrl,
				V4L2_MPEG_STREAM_TYPE_MPEG2_TS,
				V4L2_MPEG_STREAM_TYPE_MPEG2_TS, 1,
				V4L2_MPEG_STREAM_TYPE_MPEG2_TS);

	case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
	case V4L2_CID_MPEG_VIDEO_BITRATE:
	case V4L2_CID_MPEG_STREAM_PID_PMT:
	case V4L2_CID_MPEG_STREAM_PID_AUDIO:
	case V4L2_CID_MPEG_STREAM_PID_VIDEO:
	case V4L2_CID_MPEG_STREAM_PID_PCR:
		return v4l2_ctrl_query_fill_std(qctrl);

	default:
		break;
	}
	return -EINVAL;
}

static int saa6752hs_querymenu(struct v4l2_subdev *sd, struct v4l2_querymenu *qmenu)
{
	static const u32 mpeg_audio_encoding[] = {
		V4L2_MPEG_AUDIO_ENCODING_LAYER_2,
		V4L2_CTRL_MENU_IDS_END
	};
	static const u32 mpeg_audio_ac3_encoding[] = {
		V4L2_MPEG_AUDIO_ENCODING_LAYER_2,
		V4L2_MPEG_AUDIO_ENCODING_AC3,
		V4L2_CTRL_MENU_IDS_END
	};
	static u32 mpeg_audio_l2_bitrate[] = {
		V4L2_MPEG_AUDIO_L2_BITRATE_256K,
		V4L2_MPEG_AUDIO_L2_BITRATE_384K,
		V4L2_CTRL_MENU_IDS_END
	};
	static u32 mpeg_audio_ac3_bitrate[] = {
		V4L2_MPEG_AUDIO_AC3_BITRATE_256K,
		V4L2_MPEG_AUDIO_AC3_BITRATE_384K,
		V4L2_CTRL_MENU_IDS_END
	};
	struct saa6752hs_state *h = to_state(sd);
	struct v4l2_queryctrl qctrl;
	int err;

	qctrl.id = qmenu->id;
	err = saa6752hs_queryctrl(sd, &qctrl);
	if (err)
		return err;
	switch (qmenu->id) {
	case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
		return v4l2_ctrl_query_menu_valid_items(qmenu,
				mpeg_audio_l2_bitrate);
	case V4L2_CID_MPEG_AUDIO_AC3_BITRATE:
		if (!h->has_ac3)
			return -EINVAL;
		return v4l2_ctrl_query_menu_valid_items(qmenu,
				mpeg_audio_ac3_bitrate);
	case V4L2_CID_MPEG_AUDIO_ENCODING:
		return v4l2_ctrl_query_menu_valid_items(qmenu,
			h->has_ac3 ? mpeg_audio_ac3_encoding :
				mpeg_audio_encoding);
	}
	return v4l2_ctrl_query_menu(qmenu, &qctrl, NULL);
}

static int saa6752hs_init(struct v4l2_subdev *sd, u32 leading_null_bytes)
{
	unsigned char buf[9], buf2[4];
	struct saa6752hs_state *h = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	unsigned size;
	u32 crc;
	unsigned char localPAT[256];
	unsigned char localPMT[256];

	/* Set video format - must be done first as it resets other settings */
	set_reg8(client, 0x41, h->video_format);

	/* Set number of lines in input signal */
	set_reg8(client, 0x40, (h->standard & V4L2_STD_525_60) ? 1 : 0);

	/* set bitrate */
	saa6752hs_set_bitrate(client, h);

	/* Set GOP structure {3, 13} */
	set_reg16(client, 0x72, 0x030d);

	/* Set minimum Q-scale {4} */
	set_reg8(client, 0x82, 0x04);

	/* Set maximum Q-scale {12} */
	set_reg8(client, 0x83, 0x0c);

	/* Set Output Protocol */
	set_reg8(client, 0xd0, 0x81);

	/* Set video output stream format {TS} */
	set_reg8(client, 0xb0, 0x05);

	/* Set leading null byte for TS */
	set_reg16(client, 0xf6, leading_null_bytes);

	/* compute PAT */
	memcpy(localPAT, PAT, sizeof(PAT));
	localPAT[17] = 0xe0 | ((h->params.ts_pid_pmt >> 8) & 0x0f);
	localPAT[18] = h->params.ts_pid_pmt & 0xff;
	crc = crc32_be(~0, &localPAT[7], sizeof(PAT) - 7 - 4);
	localPAT[sizeof(PAT) - 4] = (crc >> 24) & 0xFF;
	localPAT[sizeof(PAT) - 3] = (crc >> 16) & 0xFF;
	localPAT[sizeof(PAT) - 2] = (crc >> 8) & 0xFF;
	localPAT[sizeof(PAT) - 1] = crc & 0xFF;

	/* compute PMT */
	if (h->params.au_encoding == V4L2_MPEG_AUDIO_ENCODING_AC3) {
		size = sizeof(PMT_AC3);
		memcpy(localPMT, PMT_AC3, size);
	} else {
		size = sizeof(PMT);
		memcpy(localPMT, PMT, size);
	}
	localPMT[3] = 0x40 | ((h->params.ts_pid_pmt >> 8) & 0x0f);
	localPMT[4] = h->params.ts_pid_pmt & 0xff;
	localPMT[15] = 0xE0 | ((h->params.ts_pid_pcr >> 8) & 0x0F);
	localPMT[16] = h->params.ts_pid_pcr & 0xFF;
	localPMT[20] = 0xE0 | ((h->params.ts_pid_video >> 8) & 0x0F);
	localPMT[21] = h->params.ts_pid_video & 0xFF;
	localPMT[25] = 0xE0 | ((h->params.ts_pid_audio >> 8) & 0x0F);
	localPMT[26] = h->params.ts_pid_audio & 0xFF;
	crc = crc32_be(~0, &localPMT[7], size - 7 - 4);
	localPMT[size - 4] = (crc >> 24) & 0xFF;
	localPMT[size - 3] = (crc >> 16) & 0xFF;
	localPMT[size - 2] = (crc >> 8) & 0xFF;
	localPMT[size - 1] = crc & 0xFF;

	/* Set Audio PID */
	set_reg16(client, 0xc1, h->params.ts_pid_audio);

	/* Set Video PID */
	set_reg16(client, 0xc0, h->params.ts_pid_video);

	/* Set PCR PID */
	set_reg16(client, 0xc4, h->params.ts_pid_pcr);

	/* Send SI tables */
	i2c_master_send(client, localPAT, sizeof(PAT));
	i2c_master_send(client, localPMT, size);

	/* mute then unmute audio. This removes buzzing artefacts */
	set_reg8(client, 0xa4, 1);
	set_reg8(client, 0xa4, 0);

	/* start it going */
	saa6752hs_chip_command(client, SAA6752HS_COMMAND_START);

	/* readout current state */
	buf[0] = 0xE1;
	buf[1] = 0xA7;
	buf[2] = 0xFE;
	buf[3] = 0x82;
	buf[4] = 0xB0;
	i2c_master_send(client, buf, 5);
	i2c_master_recv(client, buf2, 4);

	/* change aspect ratio */
	buf[0] = 0xE0;
	buf[1] = 0xA7;
	buf[2] = 0xFE;
	buf[3] = 0x82;
	buf[4] = 0xB0;
	buf[5] = buf2[0];
	switch (h->params.vi_aspect) {
	case V4L2_MPEG_VIDEO_ASPECT_16x9:
		buf[6] = buf2[1] | 0x40;
		break;
	case V4L2_MPEG_VIDEO_ASPECT_4x3:
	default:
		buf[6] = buf2[1] & 0xBF;
		break;
	}
	buf[7] = buf2[2];
	buf[8] = buf2[3];
	i2c_master_send(client, buf, 9);

	return 0;
}

static int saa6752hs_do_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls, int set)
{
	struct saa6752hs_state *h = to_state(sd);
	struct saa6752hs_mpeg_params params;
	int i;

	if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
		return -EINVAL;

	params = h->params;
	for (i = 0; i < ctrls->count; i++) {
		int err = handle_ctrl(h->has_ac3, &params, ctrls->controls + i, set);

		if (err) {
			ctrls->error_idx = i;
			return err;
		}
	}
	if (set)
		h->params = params;
	return 0;
}

static int saa6752hs_s_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls)
{
	return saa6752hs_do_ext_ctrls(sd, ctrls, 1);
}

static int saa6752hs_try_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls)
{
	return saa6752hs_do_ext_ctrls(sd, ctrls, 0);
}

static int saa6752hs_g_ext_ctrls(struct v4l2_subdev *sd, struct v4l2_ext_controls *ctrls)
{
	struct saa6752hs_state *h = to_state(sd);
	int i;

	if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
		return -EINVAL;

	for (i = 0; i < ctrls->count; i++) {
		int err = get_ctrl(h->has_ac3, &h->params, ctrls->controls + i);

		if (err) {
			ctrls->error_idx = i;
			return err;
		}
	}
	return 0;
}

static int saa6752hs_g_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
{
	struct saa6752hs_state *h = to_state(sd);

	if (h->video_format == SAA6752HS_VF_UNKNOWN)
		h->video_format = SAA6752HS_VF_D1;
	f->fmt.pix.width =
		v4l2_format_table[h->video_format].fmt.pix.width;
	f->fmt.pix.height =
		v4l2_format_table[h->video_format].fmt.pix.height;
	return 0;
}

static int saa6752hs_s_fmt(struct v4l2_subdev *sd, struct v4l2_format *f)
{
	struct saa6752hs_state *h = to_state(sd);
	int dist_352, dist_480, dist_720;

	/*
	  FIXME: translate and round width/height into EMPRESS
	  subsample type:

	  type   |   PAL   |  NTSC
	  ---------------------------
	  SIF    | 352x288 | 352x240
	  1/2 D1 | 352x576 | 352x480
	  2/3 D1 | 480x576 | 480x480
	  D1     | 720x576 | 720x480
	*/

	dist_352 = abs(f->fmt.pix.width - 352);
	dist_480 = abs(f->fmt.pix.width - 480);
	dist_720 = abs(f->fmt.pix.width - 720);
	if (dist_720 < dist_480) {
		f->fmt.pix.width = 720;
		f->fmt.pix.height = 576;
		h->video_format = SAA6752HS_VF_D1;
	} else if (dist_480 < dist_352) {
		f->fmt.pix.width = 480;
		f->fmt.pix.height = 576;
		h->video_format = SAA6752HS_VF_2_3_D1;
	} else {
		f->fmt.pix.width = 352;
		if (abs(f->fmt.pix.height - 576) <
		    abs(f->fmt.pix.height - 288)) {
			f->fmt.pix.height = 576;
			h->video_format = SAA6752HS_VF_1_2_D1;
		} else {
			f->fmt.pix.height = 288;
			h->video_format = SAA6752HS_VF_SIF;
		}
	}
	return 0;
}

static int saa6752hs_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
{
	struct saa6752hs_state *h = to_state(sd);

	h->standard = std;
	return 0;
}

static int saa6752hs_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	struct saa6752hs_state *h = to_state(sd);

	return v4l2_chip_ident_i2c_client(client,
			chip, h->chip, h->revision);
}

static int saa6752hs_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
}

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

static const struct v4l2_subdev_core_ops saa6752hs_core_ops = {
	.g_chip_ident = saa6752hs_g_chip_ident,
	.init = saa6752hs_init,
	.queryctrl = saa6752hs_queryctrl,
	.querymenu = saa6752hs_querymenu,
	.g_ext_ctrls = saa6752hs_g_ext_ctrls,
	.s_ext_ctrls = saa6752hs_s_ext_ctrls,
	.try_ext_ctrls = saa6752hs_try_ext_ctrls,
};

static const struct v4l2_subdev_tuner_ops saa6752hs_tuner_ops = {
	.s_std = saa6752hs_s_std,
};

static const struct v4l2_subdev_video_ops saa6752hs_video_ops = {
	.s_fmt = saa6752hs_s_fmt,
	.g_fmt = saa6752hs_g_fmt,
};

static const struct v4l2_subdev_ops saa6752hs_ops = {
	.core = &saa6752hs_core_ops,
	.tuner = &saa6752hs_tuner_ops,
	.video = &saa6752hs_video_ops,
};

static int saa6752hs_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	struct saa6752hs_state *h = kzalloc(sizeof(*h), GFP_KERNEL);
	struct v4l2_subdev *sd;
	u8 addr = 0x13;
	u8 data[12];

	v4l_info(client, "chip found @ 0x%x (%s)\n",
			client->addr << 1, client->adapter->name);
	if (h == NULL)
		return -ENOMEM;
	sd = &h->sd;
	v4l2_i2c_subdev_init(sd, client, &saa6752hs_ops);

	i2c_master_send(client, &addr, 1);
	i2c_master_recv(client, data, sizeof(data));
	h->chip = V4L2_IDENT_SAA6752HS;
	h->revision = (data[8] << 8) | data[9];
	h->has_ac3 = 0;
	if (h->revision == 0x0206) {
		h->chip = V4L2_IDENT_SAA6752HS_AC3;
		h->has_ac3 = 1;
		v4l_info(client, "support AC-3\n");
	}
	h->params = param_defaults;
	h->standard = 0; /* Assume 625 input lines */
	return 0;
}

static int saa6752hs_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	kfree(to_state(sd));
	return 0;
}

static const struct i2c_device_id saa6752hs_id[] = {
	{ "saa6752hs", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, saa6752hs_id);

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "saa6752hs",
	.driverid = I2C_DRIVERID_SAA6752HS,
	.command = saa6752hs_command,
	.probe = saa6752hs_probe,
	.remove = saa6752hs_remove,
	.id_table = saa6752hs_id,
};

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */