saa6752hs.c

trident tm5600的linux驱动

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

    Copyright (C) 2004 Andrew de Quincey

    AC-3 support:

    Copyright (C) 2008 Hans Verkuil <[e-mail]>

    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 "compat.h"
#include <linux/videodev2.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 {
	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 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 void saa6752hs_set_subsampling(struct i2c_client *client,
				      struct v4l2_format *f)
{
	struct saa6752hs_state *h = i2c_get_clientdata(client);
	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;
		}
	}
}


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

	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 &&