1 #include <linux/module.h>
2 #include <linux/kernel.h>
3 #include <linux/sched.h>
4 #include <linux/string.h>
5 #include <linux/timer.h>
6 #include <linux/delay.h>
7 #include <linux/errno.h>
8 #include <linux/slab.h>
9 #include <linux/poll.h>
10 #include <linux/i2c.h>
11 #include <linux/types.h>
12 #include <linux/videodev.h>
13 #include <linux/init.h>
14 #include <linux/crc32.h>
18 #define MPEG_VIDEO_TARGET_BITRATE_MAX 27000
19 #define MPEG_VIDEO_MAX_BITRATE_MAX 27000
20 #define MPEG_TOTAL_TARGET_BITRATE_MAX 27000
21 #define MPEG_PID_MAX ((1 << 14) - 1)
23 /* Addresses to scan */
24 static unsigned short normal_i2c[] = {0x20, I2C_CLIENT_END};
27 MODULE_DESCRIPTION("device driver for saa6752hs MPEG2 encoder");
28 MODULE_AUTHOR("Andrew de Quincey");
29 MODULE_LICENSE("GPL");
31 static struct i2c_driver driver;
32 static struct i2c_client client_template;
34 enum saa6752hs_videoformat {
35 SAA6752HS_VF_D1 = 0, /* standard D1 video format: 720x576 */
36 SAA6752HS_VF_2_3_D1 = 1,/* 2/3D1 video format: 480x576 */
37 SAA6752HS_VF_1_2_D1 = 2,/* 1/2D1 video format: 352x576 */
38 SAA6752HS_VF_SIF = 3, /* SIF video format: 352x288 */
42 static const struct v4l2_format v4l2_format_table[] =
45 .fmt = { .pix = { .width = 720, .height = 576 }, }, },
46 [SAA6752HS_VF_2_3_D1] = {
47 .fmt = { .pix = { .width = 480, .height = 576 }, }, },
48 [SAA6752HS_VF_1_2_D1] = {
49 .fmt = { .pix = { .width = 352, .height = 576 }, }, },
50 [SAA6752HS_VF_SIF] = {
51 .fmt = { .pix = { .width = 352, .height = 288 }, }, },
52 [SAA6752HS_VF_UNKNOWN] = {
53 .fmt = { .pix = { .width = 0, .height = 0 }, }, },
56 struct saa6752hs_state {
57 struct i2c_client client;
58 struct v4l2_mpeg_compression params;
59 enum saa6752hs_videoformat video_format;
62 enum saa6752hs_command {
63 SAA6752HS_COMMAND_RESET = 0,
64 SAA6752HS_COMMAND_STOP = 1,
65 SAA6752HS_COMMAND_START = 2,
66 SAA6752HS_COMMAND_PAUSE = 3,
67 SAA6752HS_COMMAND_RECONFIGURE = 4,
68 SAA6752HS_COMMAND_SLEEP = 5,
69 SAA6752HS_COMMAND_RECONFIGURE_FORCE = 6,
74 /* ---------------------------------------------------------------------- */
78 0x00, // table number for encoder
81 0x40, 0x00, // transport_error_indicator(0), payload_unit_start(1), transport_priority(0), pid(0)
82 0x10, // transport_scrambling_control(00), adaptation_field_control(01), continuity_counter(0)
84 0x00, // PSI pointer to start of table
87 0xb0, 0x0d, // section_syntax_indicator(1), section_length(13)
89 0x00, 0x01, // transport_stream_id(1)
91 0xc1, // version_number(0), current_next_indicator(1)
93 0x00, 0x00, // section_number(0), last_section_number(0)
95 0x00, 0x01, // program_number(1)
97 0xe0, 0x00, // PMT PID
99 0x00, 0x00, 0x00, 0x00 // CRC32
103 0xc2, // i2c register
104 0x01, // table number for encoder
107 0x40, 0x00, // transport_error_indicator(0), payload_unit_start(1), transport_priority(0), pid
108 0x10, // transport_scrambling_control(00), adaptation_field_control(01), continuity_counter(0)
110 0x00, // PSI pointer to start of table
113 0xb0, 0x17, // section_syntax_indicator(1), section_length(23)
115 0x00, 0x01, // program_number(1)
117 0xc1, // version_number(0), current_next_indicator(1)
119 0x00, 0x00, // section_number(0), last_section_number(0)
121 0xe0, 0x00, // PCR_PID
123 0xf0, 0x00, // program_info_length(0)
125 0x02, 0xe0, 0x00, 0xf0, 0x00, // video stream type(2), pid
126 0x04, 0xe0, 0x00, 0xf0, 0x00, // audio stream type(4), pid
128 0x00, 0x00, 0x00, 0x00 // CRC32
131 static struct v4l2_mpeg_compression param_defaults =
133 .st_type = V4L2_MPEG_TS_2,
135 .mode = V4L2_BITRATE_CBR,
144 .vi_type = V4L2_MPEG_VI_2,
145 .vi_aspect_ratio = V4L2_MPEG_ASPECT_4_3,
147 .mode = V4L2_BITRATE_VBR,
152 .au_type = V4L2_MPEG_AU_2_II,
154 .mode = V4L2_BITRATE_CBR,
159 /* FIXME: size? via S_FMT? */
160 .video_format = MPEG_VIDEO_FORMAT_D1,
164 /* ---------------------------------------------------------------------- */
166 static int saa6752hs_chip_command(struct i2c_client* client,
167 enum saa6752hs_command command)
169 unsigned char buf[3];
170 unsigned long timeout;
173 // execute the command
175 case SAA6752HS_COMMAND_RESET:
179 case SAA6752HS_COMMAND_STOP:
183 case SAA6752HS_COMMAND_START:
187 case SAA6752HS_COMMAND_PAUSE:
191 case SAA6752HS_COMMAND_RECONFIGURE:
195 case SAA6752HS_COMMAND_SLEEP:
199 case SAA6752HS_COMMAND_RECONFIGURE_FORCE:
207 // set it and wait for it to be so
208 i2c_master_send(client, buf, 1);
209 timeout = jiffies + HZ * 3;
211 // get the current status
213 i2c_master_send(client, buf, 1);
214 i2c_master_recv(client, buf, 1);
216 if (!(buf[0] & 0x20))
218 if (time_after(jiffies,timeout)) {
227 // delay a bit to let encoder settle
235 static int saa6752hs_set_bitrate(struct i2c_client* client,
236 struct v4l2_mpeg_compression* params)
240 // set the bitrate mode
242 buf[1] = (params->vi_bitrate.mode == V4L2_BITRATE_VBR) ? 0 : 1;
243 i2c_master_send(client, buf, 2);
245 // set the video bitrate
246 if (params->vi_bitrate.mode == V4L2_BITRATE_VBR) {
247 // set the target bitrate
249 buf[1] = params->vi_bitrate.target >> 8;
250 buf[2] = params->vi_bitrate.target & 0xff;
251 i2c_master_send(client, buf, 3);
253 // set the max bitrate
255 buf[1] = params->vi_bitrate.max >> 8;
256 buf[2] = params->vi_bitrate.max & 0xff;
257 i2c_master_send(client, buf, 3);
259 // set the target bitrate (no max bitrate for CBR)
261 buf[1] = params->vi_bitrate.target >> 8;
262 buf[2] = params->vi_bitrate.target & 0xff;
263 i2c_master_send(client, buf, 3);
266 // set the audio bitrate
268 buf[1] = (256 == params->au_bitrate.target) ? 0 : 1;
269 i2c_master_send(client, buf, 2);
271 // set the total bitrate
273 buf[1] = params->st_bitrate.target >> 8;
274 buf[2] = params->st_bitrate.target & 0xff;
275 i2c_master_send(client, buf, 3);
281 static void saa6752hs_set_subsampling(struct i2c_client* client,
282 struct v4l2_format* f)
284 struct saa6752hs_state *h = i2c_get_clientdata(client);
285 int dist_352, dist_480, dist_720;
288 FIXME: translate and round width/height into EMPRESS
292 ---------------------------
293 SIF | 352x288 | 352x240
294 1/2 D1 | 352x576 | 352x480
295 2/3 D1 | 480x576 | 480x480
296 D1 | 720x576 | 720x480
299 dist_352 = abs(f->fmt.pix.width - 352);
300 dist_480 = abs(f->fmt.pix.width - 480);
301 dist_720 = abs(f->fmt.pix.width - 720);
302 if (dist_720 < dist_480) {
303 f->fmt.pix.width = 720;
304 f->fmt.pix.height = 576;
305 h->video_format = SAA6752HS_VF_D1;
307 else if (dist_480 < dist_352) {
308 f->fmt.pix.width = 480;
309 f->fmt.pix.height = 576;
310 h->video_format = SAA6752HS_VF_2_3_D1;
313 f->fmt.pix.width = 352;
314 if (abs(f->fmt.pix.height - 576) <
315 abs(f->fmt.pix.height - 288)) {
316 f->fmt.pix.height = 576;
317 h->video_format = SAA6752HS_VF_1_2_D1;
320 f->fmt.pix.height = 288;
321 h->video_format = SAA6752HS_VF_SIF;
327 static void saa6752hs_set_params(struct i2c_client* client,
328 struct v4l2_mpeg_compression* params)
330 struct saa6752hs_state *h = i2c_get_clientdata(client);
333 if (params->ts_pid_pmt <= MPEG_PID_MAX)
334 h->params.ts_pid_pmt = params->ts_pid_pmt;
335 if (params->ts_pid_pcr <= MPEG_PID_MAX)
336 h->params.ts_pid_pcr = params->ts_pid_pcr;
337 if (params->ts_pid_video <= MPEG_PID_MAX)
338 h->params.ts_pid_video = params->ts_pid_video;
339 if (params->ts_pid_audio <= MPEG_PID_MAX)
340 h->params.ts_pid_audio = params->ts_pid_audio;
342 /* check bitrate parameters */
343 if ((params->vi_bitrate.mode == V4L2_BITRATE_CBR) ||
344 (params->vi_bitrate.mode == V4L2_BITRATE_VBR))
345 h->params.vi_bitrate.mode = params->vi_bitrate.mode;
346 if (params->vi_bitrate.mode != V4L2_BITRATE_NONE)
347 h->params.st_bitrate.target = params->st_bitrate.target;
348 if (params->vi_bitrate.mode != V4L2_BITRATE_NONE)
349 h->params.vi_bitrate.target = params->vi_bitrate.target;
350 if (params->vi_bitrate.mode == V4L2_BITRATE_VBR)
351 h->params.vi_bitrate.max = params->vi_bitrate.max;
352 if (params->au_bitrate.mode != V4L2_BITRATE_NONE)
353 h->params.au_bitrate.target = params->au_bitrate.target;
356 if (params->vi_aspect_ratio == V4L2_MPEG_ASPECT_4_3 ||
357 params->vi_aspect_ratio == V4L2_MPEG_ASPECT_16_9)
358 h->params.vi_aspect_ratio = params->vi_aspect_ratio;
361 if (h->params.st_bitrate.target > MPEG_TOTAL_TARGET_BITRATE_MAX)
362 h->params.st_bitrate.target = MPEG_TOTAL_TARGET_BITRATE_MAX;
363 if (h->params.vi_bitrate.target > MPEG_VIDEO_TARGET_BITRATE_MAX)
364 h->params.vi_bitrate.target = MPEG_VIDEO_TARGET_BITRATE_MAX;
365 if (h->params.vi_bitrate.max > MPEG_VIDEO_MAX_BITRATE_MAX)
366 h->params.vi_bitrate.max = MPEG_VIDEO_MAX_BITRATE_MAX;
367 if (h->params.au_bitrate.target <= 256)
368 h->params.au_bitrate.target = 256;
370 h->params.au_bitrate.target = 384;
373 static int saa6752hs_init(struct i2c_client* client)
375 unsigned char buf[9], buf2[4];
376 struct saa6752hs_state *h;
378 unsigned char localPAT[256];
379 unsigned char localPMT[256];
381 h = i2c_get_clientdata(client);
383 // Set video format - must be done first as it resets other settings
385 buf[1] = h->video_format;
386 i2c_master_send(client, buf, 2);
389 saa6752hs_set_bitrate(client, &h->params);
391 // Set GOP structure {3, 13}
395 i2c_master_send(client,buf,3);
397 // Set minimum Q-scale {4}
400 i2c_master_send(client,buf,2);
402 // Set maximum Q-scale {12}
405 i2c_master_send(client,buf,2);
407 // Set Output Protocol
410 i2c_master_send(client,buf,2);
412 // Set video output stream format {TS}
415 i2c_master_send(client,buf,2);
418 memcpy(localPAT, PAT, sizeof(PAT));
419 localPAT[17] = 0xe0 | ((h->params.ts_pid_pmt >> 8) & 0x0f);
420 localPAT[18] = h->params.ts_pid_pmt & 0xff;
421 crc = crc32_be(~0, &localPAT[7], sizeof(PAT) - 7 - 4);
422 localPAT[sizeof(PAT) - 4] = (crc >> 24) & 0xFF;
423 localPAT[sizeof(PAT) - 3] = (crc >> 16) & 0xFF;
424 localPAT[sizeof(PAT) - 2] = (crc >> 8) & 0xFF;
425 localPAT[sizeof(PAT) - 1] = crc & 0xFF;
428 memcpy(localPMT, PMT, sizeof(PMT));
429 localPMT[3] = 0x40 | ((h->params.ts_pid_pmt >> 8) & 0x0f);
430 localPMT[4] = h->params.ts_pid_pmt & 0xff;
431 localPMT[15] = 0xE0 | ((h->params.ts_pid_pcr >> 8) & 0x0F);
432 localPMT[16] = h->params.ts_pid_pcr & 0xFF;
433 localPMT[20] = 0xE0 | ((h->params.ts_pid_video >> 8) & 0x0F);
434 localPMT[21] = h->params.ts_pid_video & 0xFF;
435 localPMT[25] = 0xE0 | ((h->params.ts_pid_audio >> 8) & 0x0F);
436 localPMT[26] = h->params.ts_pid_audio & 0xFF;
437 crc = crc32_be(~0, &localPMT[7], sizeof(PMT) - 7 - 4);
438 localPMT[sizeof(PMT) - 4] = (crc >> 24) & 0xFF;
439 localPMT[sizeof(PMT) - 3] = (crc >> 16) & 0xFF;
440 localPMT[sizeof(PMT) - 2] = (crc >> 8) & 0xFF;
441 localPMT[sizeof(PMT) - 1] = crc & 0xFF;
445 buf[1] = (h->params.ts_pid_audio >> 8) & 0xFF;
446 buf[2] = h->params.ts_pid_audio & 0xFF;
447 i2c_master_send(client,buf,3);
451 buf[1] = (h->params.ts_pid_video >> 8) & 0xFF;
452 buf[2] = h->params.ts_pid_video & 0xFF;
453 i2c_master_send(client,buf,3);
457 buf[1] = (h->params.ts_pid_pcr >> 8) & 0xFF;
458 buf[2] = h->params.ts_pid_pcr & 0xFF;
459 i2c_master_send(client,buf,3);
462 i2c_master_send(client,localPAT,sizeof(PAT));
463 i2c_master_send(client,localPMT,sizeof(PMT));
465 // mute then unmute audio. This removes buzzing artefacts
468 i2c_master_send(client, buf, 2);
470 i2c_master_send(client, buf, 2);
473 saa6752hs_chip_command(client, SAA6752HS_COMMAND_START);
475 // readout current state
481 i2c_master_send(client, buf, 5);
482 i2c_master_recv(client, buf2, 4);
484 // change aspect ratio
491 switch(h->params.vi_aspect_ratio) {
492 case V4L2_MPEG_ASPECT_16_9:
493 buf[6] = buf2[1] | 0x40;
495 case V4L2_MPEG_ASPECT_4_3:
497 buf[6] = buf2[1] & 0xBF;
503 i2c_master_send(client, buf, 9);
509 static int saa6752hs_attach(struct i2c_adapter *adap, int addr, int kind)
511 struct saa6752hs_state *h;
513 printk("saa6752hs: chip found @ 0x%x\n", addr<<1);
515 if (NULL == (h = kmalloc(sizeof(*h), GFP_KERNEL)))
517 memset(h,0,sizeof(*h));
518 h->client = client_template;
519 h->params = param_defaults;
520 h->client.adapter = adap;
521 h->client.addr = addr;
523 i2c_set_clientdata(&h->client, h);
524 i2c_attach_client(&h->client);
528 static int saa6752hs_probe(struct i2c_adapter *adap)
530 if (adap->class & I2C_CLASS_TV_ANALOG)
531 return i2c_probe(adap, &addr_data, saa6752hs_attach);
535 static int saa6752hs_detach(struct i2c_client *client)
537 struct saa6752hs_state *h;
539 h = i2c_get_clientdata(client);
540 i2c_detach_client(client);
546 saa6752hs_command(struct i2c_client *client, unsigned int cmd, void *arg)
548 struct saa6752hs_state *h = i2c_get_clientdata(client);
549 struct v4l2_mpeg_compression *params = arg;
553 case VIDIOC_S_MPEGCOMP:
554 if (NULL == params) {
555 /* apply settings and start encoder */
556 saa6752hs_init(client);
559 saa6752hs_set_params(client, params);
561 case VIDIOC_G_MPEGCOMP:
566 struct v4l2_format *f = arg;
568 if (h->video_format == SAA6752HS_VF_UNKNOWN)
569 h->video_format = SAA6752HS_VF_D1;
571 v4l2_format_table[h->video_format].fmt.pix.width;
573 v4l2_format_table[h->video_format].fmt.pix.height;
578 struct v4l2_format *f = arg;
580 saa6752hs_set_subsampling(client, f);
591 /* ----------------------------------------------------------------------- */
593 static struct i2c_driver driver = {
594 .owner = THIS_MODULE,
595 .name = "i2c saa6752hs MPEG encoder",
596 .id = I2C_DRIVERID_SAA6752HS,
597 .flags = I2C_DF_NOTIFY,
598 .attach_adapter = saa6752hs_probe,
599 .detach_client = saa6752hs_detach,
600 .command = saa6752hs_command,
603 static struct i2c_client client_template =
605 I2C_DEVNAME("saa6752hs"),
606 .flags = I2C_CLIENT_ALLOW_USE,
610 static int __init saa6752hs_init_module(void)
612 return i2c_add_driver(&driver);
615 static void __exit saa6752hs_cleanup_module(void)
617 i2c_del_driver(&driver);
620 module_init(saa6752hs_init_module);
621 module_exit(saa6752hs_cleanup_module);
624 * Overrides for Emacs so that we follow Linus's tabbing style.
625 * ---------------------------------------------------------------------------