#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.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/videodev.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <media/id.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");
static struct i2c_driver driver;
static struct i2c_client client_template;
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,
};
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 i2c_client client;
struct v4l2_mpeg_compression params;
enum saa6752hs_videoformat video_format;
};
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 struct v4l2_mpeg_compression param_defaults =
{
.st_type = V4L2_MPEG_TS_2,
.st_bitrate = {
.mode = V4L2_BITRATE_CBR,
.target = 7000,
},
.ts_pid_pmt = 16,
.ts_pid_video = 260,
.ts_pid_audio = 256,
.ts_pid_pcr = 259,
.vi_type = V4L2_MPEG_VI_2,
.vi_aspect_ratio = V4L2_MPEG_ASPECT_4_3,
.vi_bitrate = {
.mode = V4L2_BITRATE_VBR,
.target = 4000,
.max = 6000,
},
.au_type = V4L2_MPEG_AU_2_II,
.au_bitrate = {
.mode = V4L2_BITRATE_CBR,
.target = 256,
},
#if 0
/* FIXME: size? via S_FMT? */
.video_format = MPEG_VIDEO_FORMAT_D1,
#endif
};
/* ---------------------------------------------------------------------- */
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;
}
// wait a bit
msleep(10);
}
// delay a bit to let encoder settle
msleep(50);
// done
return status;
}
static int saa6752hs_set_bitrate(struct i2c_client* client,
struct v4l2_mpeg_compression* params)
{
u8 buf[3];
// set the bitrate mode
buf[0] = 0x71;
buf[1] = (params->vi_bitrate.mode == V4L2_BITRATE_VBR) ? 0 : 1;
i2c_master_send(client, buf, 2);
// set the video bitrate
if (params->vi_bitrate.mode == V4L2_BITRATE_VBR) {
// set the target bitrate
buf[0] = 0x80;
buf[1] = params->vi_bitrate.target >> 8;
buf[2] = params->vi_bitrate.target & 0xff;
i2c_master_send(client, buf, 3);
// set the max bitrate
buf[0] = 0x81;
buf[1] = params->vi_bitrate.max >> 8;
buf[2] = params->vi_bitrate.max & 0xff;
i2c_master_send(client, buf, 3);
} else {
// set the target bitrate (no max bitrate for CBR)
buf[0] = 0x81;
buf[1] = params->vi_bitrate.target >> 8;
buf[2] = params->vi_bitrate.target & 0xff;
i2c_master_send(client, buf, 3);
}
// set the audio bitrate
buf[0] = 0x94;
buf[1] = (256 == params->au_bitrate.target) ? 0 : 1;
i2c_master_send(client, buf, 2);
// set the total bitrate
buf[0] = 0xb1;
buf[1] = params->st_bitrate.target >> 8;
buf[2] = params->st_bitrate.target & 0xff;
i2c_master_send(client, buf, 3);
// return success
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 void saa6752hs_set_params(struct i2c_client* client,
struct v4l2_mpeg_compression* params)
{
struct saa6752hs_state *h = i2c_get_clientdata(client);
/* check PIDs */
if (params->ts_pid_pmt <= MPEG_PID_MAX)
h->params.ts_pid_pmt = params->ts_pid_pmt;
if (params->ts_pid_pcr <= MPEG_PID_MAX)
h->params.ts_pid_pcr = params->ts_pid_pcr;
if (params->ts_pid_video <= MPEG_PID_MAX)
h->params.ts_pid_video = params->ts_pid_video;
if (params->ts_pid_audio <= MPEG_PID_MAX)
h->params.ts_pid_audio = params->ts_pid_audio;
/* check bitrate parameters */
if ((params->vi_bitrate.mode == V4L2_BITRATE_CBR) ||
(params->vi_bitrate.mode == V4L2_BITRATE_VBR))
h->params.vi_bitrate.mode = params->vi_bitrate.mode;
if (params->vi_bitrate.mode != V4L2_BITRATE_NONE)
h->params.st_bitrate.target = params->st_bitrate.target;
if (params->vi_bitrate.mode != V4L2_BITRATE_NONE)
h->params.vi_bitrate.target = params->vi_bitrate.target;
if (params->vi_bitrate.mode == V4L2_BITRATE_VBR)
h->params.vi_bitrate.max = params->vi_bitrate.max;
if (params->au_bitrate.mode != V4L2_BITRATE_NONE)
h->params.au_bitrate.target = params->au_bitrate.target;
/* aspect ratio */
if (params->vi_aspect_ratio == V4L2_MPEG_ASPECT_4_3 ||
params->vi_aspect_ratio == V4L2_MPEG_ASPECT_16_9)
h->params.vi_aspect_ratio = params->vi_aspect_ratio;
/* range checks */
if (h->params.st_bitrate.target > MPEG_TOTAL_TARGET_BITRATE_MAX)
h->params.st_bitrate.target = MPEG_TOTAL_TARGET_BITRATE_MAX;
if (h->params.vi_bitrate.target > MPEG_VIDEO_TARGET_BITRATE_MAX)
h->params.vi_bitrate.target = MPEG_VIDEO_TARGET_BITRATE_MAX;
if (h->params.vi_bitrate.max > MPEG_VIDEO_MAX_BITRATE_MAX)
h->params.vi_bitrate.max = MPEG_VIDEO_MAX_BITRATE_MAX;
if (h->params.au_bitrate.target <= 256)
h->params.au_bitrate.target = 256;
else
h->params.au_bitrate.target = 384;
}
static int saa6752hs_init(struct i2c_client* client)
{
unsigned char buf[9], buf2[4];
struct saa6752hs_state *h;
u32 crc;
unsigned char localPAT[256];
unsigned char localPMT[256];
h = i2c_get_clientdata(client);
// Set video format - must be done first as it resets other settings
buf[0] = 0x41;
buf[1] = h->video_format;
i2c_master_send(client, buf, 2);
// set bitrate
saa6752hs_set_bitrate(client, &h->params);
// Set GOP structure {3, 13}
buf[0] = 0x72;
buf[1] = 0x03;
buf[2] = 0x0D;
i2c_master_send(client,buf,3);
// Set minimum Q-scale {4}
buf[0] = 0x82;
buf[1] = 0x04;
i2c_master_send(client,buf,2);
// Set maximum Q-scale {12}
buf[0] = 0x83;
buf[1] = 0x0C;
i2c_master_send(client,buf,2);
// Set Output Protocol
buf[0] = 0xD0;
buf[1] = 0x81;
i2c_master_send(client,buf,2);
// Set video output stream format {TS}
buf[0] = 0xB0;
buf[1] = 0x05;
i2c_master_send(client,buf,2);
/* 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 */
memcpy(localPMT, PMT, sizeof(PMT));
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], sizeof(PMT) - 7 - 4);
localPMT[sizeof(PMT) - 4] = (crc >> 24) & 0xFF;
localPMT[sizeof(PMT) - 3] = (crc >> 16) & 0xFF;
localPMT[sizeof(PMT) - 2] = (crc >> 8) & 0xFF;
localPMT[sizeof(PMT) - 1] = crc & 0xFF;
// Set Audio PID
buf[0] = 0xC1;
buf[1] = (h->params.ts_pid_audio >> 8) & 0xFF;
buf[2] = h->params.ts_pid_audio & 0xFF;
i2c_master_send(client,buf,3);
// Set Video PID
buf[0] = 0xC0;
buf[1] = (h->params.ts_pid_video >> 8) & 0xFF;
buf[2] = h->params.ts_pid_video & 0xFF;
i2c_master_send(client,buf,3);
// Set PCR PID
buf[0] = 0xC4;
buf[1] = (h->params.ts_pid_pcr >> 8) & 0xFF;
buf[2] = h->params.ts_pid_pcr & 0xFF;
i2c_master_send(client,buf,3);
// Send SI tables
i2c_master_send(client,localPAT,sizeof(PAT));
i2c_master_send(client,localPMT,sizeof(PMT));
// mute then unmute audio. This removes buzzing artefacts
buf[0] = 0xa4;
buf[1] = 1;
i2c_master_send(client, buf, 2);
buf[1] = 0;
i2c_master_send(client, buf, 2);
// 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_ratio) {
case V4L2_MPEG_ASPECT_16_9:
buf[6] = buf2[1] | 0x40;
break;
case V4L2_MPEG_ASPECT_4_3:
default:
buf[6] = buf2[1] & 0xBF;
break;
break;
}
buf[7] = buf2[2];
buf[8] = buf2[3];
i2c_master_send(client, buf, 9);
// return success
return 0;
}
static int saa6752hs_attach(struct i2c_adapter *adap, int addr, int kind)
{
struct saa6752hs_state *h;
printk("saa6752hs: chip found @ 0x%x\n", addr<<1);
if (NULL == (h = kmalloc(sizeof(*h), GFP_KERNEL)))
return -ENOMEM;
memset(h,0,sizeof(*h));
h->client = client_template;
h->params = param_defaults;
h->client.adapter = adap;
h->client.addr = addr;
i2c_set_clientdata(&h->client, h);
i2c_attach_client(&h->client);
return 0;
}
static int saa6752hs_probe(struct i2c_adapter *adap)
{
if (adap->class & I2C_CLASS_TV_ANALOG)
return i2c_probe(adap, &addr_data, saa6752hs_attach);
return 0;
}
static int saa6752hs_detach(struct i2c_client *client)
{
struct saa6752hs_state *h;
h = i2c_get_clientdata(client);
i2c_detach_client(client);
kfree(h);
return 0;
}
static int
saa6752hs_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
struct saa6752hs_state *h = i2c_get_clientdata(client);
struct v4l2_mpeg_compression *params = arg;
int err = 0;
switch (cmd) {
case VIDIOC_S_MPEGCOMP:
if (NULL == params) {
/* apply settings and start encoder */
saa6752hs_init(client);
break;
}
saa6752hs_set_params(client, params);
/* fall through */
case VIDIOC_G_MPEGCOMP:
*params = h->params;
break;
case VIDIOC_G_FMT:
{
struct v4l2_format *f = arg;
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;
break ;
}
case VIDIOC_S_FMT:
{
struct v4l2_format *f = arg;
saa6752hs_set_subsampling(client, f);
break;
}
default:
/* nothing */
break;
}
return err;
}
/* ----------------------------------------------------------------------- */
static struct i2c_driver driver = {
.owner = THIS_MODULE,
.name = "i2c saa6752hs MPEG encoder",
.id = I2C_DRIVERID_SAA6752HS,
.flags = I2C_DF_NOTIFY,
.attach_adapter = saa6752hs_probe,
.detach_client = saa6752hs_detach,
.command = saa6752hs_command,
};
static struct i2c_client client_template =
{
I2C_DEVNAME("saa6752hs"),
.flags = I2C_CLIENT_ALLOW_USE,
.driver = &driver,
};
static int __init saa6752hs_init_module(void)
{
return i2c_add_driver(&driver);
}
static void __exit saa6752hs_cleanup_module(void)
{
i2c_del_driver(&driver);
}
module_init(saa6752hs_init_module);
module_exit(saa6752hs_cleanup_module);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* ---------------------------------------------------------------------------
* Local variables:
* c-basic-offset: 8
* End:
*/
