1 /* 2 Driver for SAA6588 RDS decoder 3 4 (c) 2005 Hans J. Koch 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21 22 #include <linux/module.h> 23 #include <linux/kernel.h> 24 #include <linux/i2c.h> 25 #include <linux/types.h> 26 #include <linux/videodev2.h> 27 #include <linux/init.h> 28 #include <linux/errno.h> 29 #include <linux/slab.h> 30 #include <linux/poll.h> 31 #include <linux/wait.h> 32 #include <asm/uaccess.h> 33 34 #include <media/saa6588.h> 35 #include <media/v4l2-device.h> 36 #include <media/v4l2-chip-ident.h> 37 38 39 /* insmod options */ 40 static unsigned int debug; 41 static unsigned int xtal; 42 static unsigned int mmbs; 43 static unsigned int plvl; 44 static unsigned int bufblocks = 100; 45 46 module_param(debug, int, 0644); 47 MODULE_PARM_DESC(debug, "enable debug messages"); 48 module_param(xtal, int, 0); 49 MODULE_PARM_DESC(xtal, "select oscillator frequency (0..3), default 0"); 50 module_param(mmbs, int, 0); 51 MODULE_PARM_DESC(mmbs, "enable MMBS mode: 0=off (default), 1=on"); 52 module_param(plvl, int, 0); 53 MODULE_PARM_DESC(plvl, "select pause level (0..3), default 0"); 54 module_param(bufblocks, int, 0); 55 MODULE_PARM_DESC(bufblocks, "number of buffered blocks, default 100"); 56 57 MODULE_DESCRIPTION("v4l2 driver module for SAA6588 RDS decoder"); 58 MODULE_AUTHOR("Hans J. Koch <koch@hjk-az.de>"); 59 60 MODULE_LICENSE("GPL"); 61 62 /* ---------------------------------------------------------------------- */ 63 64 #define UNSET (-1U) 65 #define PREFIX "saa6588: " 66 #define dprintk if (debug) printk 67 68 struct saa6588 { 69 struct v4l2_subdev sd; 70 struct delayed_work work; 71 spinlock_t lock; 72 unsigned char *buffer; 73 unsigned int buf_size; 74 unsigned int rd_index; 75 unsigned int wr_index; 76 unsigned int block_count; 77 unsigned char last_blocknum; 78 wait_queue_head_t read_queue; 79 int data_available_for_read; 80 u8 sync; 81 }; 82 83 static inline struct saa6588 *to_saa6588(struct v4l2_subdev *sd) 84 { 85 return container_of(sd, struct saa6588, sd); 86 } 87 88 /* ---------------------------------------------------------------------- */ 89 90 /* 91 * SAA6588 defines 92 */ 93 94 /* Initialization and mode control byte (0w) */ 95 96 /* bit 0+1 (DAC0/DAC1) */ 97 #define cModeStandard 0x00 98 #define cModeFastPI 0x01 99 #define cModeReducedRequest 0x02 100 #define cModeInvalid 0x03 101 102 /* bit 2 (RBDS) */ 103 #define cProcessingModeRDS 0x00 104 #define cProcessingModeRBDS 0x04 105 106 /* bit 3+4 (SYM0/SYM1) */ 107 #define cErrCorrectionNone 0x00 108 #define cErrCorrection2Bits 0x08 109 #define cErrCorrection5Bits 0x10 110 #define cErrCorrectionNoneRBDS 0x18 111 112 /* bit 5 (NWSY) */ 113 #define cSyncNormal 0x00 114 #define cSyncRestart 0x20 115 116 /* bit 6 (TSQD) */ 117 #define cSigQualityDetectOFF 0x00 118 #define cSigQualityDetectON 0x40 119 120 /* bit 7 (SQCM) */ 121 #define cSigQualityTriggered 0x00 122 #define cSigQualityContinous 0x80 123 124 /* Pause level and flywheel control byte (1w) */ 125 126 /* bits 0..5 (FEB0..FEB5) */ 127 #define cFlywheelMaxBlocksMask 0x3F 128 #define cFlywheelDefault 0x20 129 130 /* bits 6+7 (PL0/PL1) */ 131 #define cPauseLevel_11mV 0x00 132 #define cPauseLevel_17mV 0x40 133 #define cPauseLevel_27mV 0x80 134 #define cPauseLevel_43mV 0xC0 135 136 /* Pause time/oscillator frequency/quality detector control byte (1w) */ 137 138 /* bits 0..4 (SQS0..SQS4) */ 139 #define cQualityDetectSensMask 0x1F 140 #define cQualityDetectDefault 0x0F 141 142 /* bit 5 (SOSC) */ 143 #define cSelectOscFreqOFF 0x00 144 #define cSelectOscFreqON 0x20 145 146 /* bit 6+7 (PTF0/PTF1) */ 147 #define cOscFreq_4332kHz 0x00 148 #define cOscFreq_8664kHz 0x40 149 #define cOscFreq_12996kHz 0x80 150 #define cOscFreq_17328kHz 0xC0 151 152 /* ---------------------------------------------------------------------- */ 153 154 static int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf) 155 { 156 int i; 157 158 if (s->rd_index == s->wr_index) { 159 if (debug > 2) 160 dprintk(PREFIX "Read: buffer empty.\n"); 161 return 0; 162 } 163 164 if (debug > 2) { 165 dprintk(PREFIX "Read: "); 166 for (i = s->rd_index; i < s->rd_index + 3; i++) 167 dprintk("0x%02x ", s->buffer[i]); 168 } 169 170 if (copy_to_user(user_buf, &s->buffer[s->rd_index], 3)) 171 return -EFAULT; 172 173 s->rd_index += 3; 174 if (s->rd_index >= s->buf_size) 175 s->rd_index = 0; 176 s->block_count--; 177 178 if (debug > 2) 179 dprintk("%d blocks total.\n", s->block_count); 180 181 return 1; 182 } 183 184 static void read_from_buf(struct saa6588 *s, struct saa6588_command *a) 185 { 186 unsigned long flags; 187 188 unsigned char __user *buf_ptr = a->buffer; 189 unsigned int i; 190 unsigned int rd_blocks; 191 192 a->result = 0; 193 if (!a->buffer) 194 return; 195 196 while (!s->data_available_for_read) { 197 int ret = wait_event_interruptible(s->read_queue, 198 s->data_available_for_read); 199 if (ret == -ERESTARTSYS) { 200 a->result = -EINTR; 201 return; 202 } 203 } 204 205 spin_lock_irqsave(&s->lock, flags); 206 rd_blocks = a->block_count; 207 if (rd_blocks > s->block_count) 208 rd_blocks = s->block_count; 209 210 if (!rd_blocks) { 211 spin_unlock_irqrestore(&s->lock, flags); 212 return; 213 } 214 215 for (i = 0; i < rd_blocks; i++) { 216 if (block_to_user_buf(s, buf_ptr)) { 217 buf_ptr += 3; 218 a->result++; 219 } else 220 break; 221 } 222 a->result *= 3; 223 s->data_available_for_read = (s->block_count > 0); 224 spin_unlock_irqrestore(&s->lock, flags); 225 } 226 227 static void block_to_buf(struct saa6588 *s, unsigned char *blockbuf) 228 { 229 unsigned int i; 230 231 if (debug > 3) 232 dprintk(PREFIX "New block: "); 233 234 for (i = 0; i < 3; ++i) { 235 if (debug > 3) 236 dprintk("0x%02x ", blockbuf[i]); 237 s->buffer[s->wr_index] = blockbuf[i]; 238 s->wr_index++; 239 } 240 241 if (s->wr_index >= s->buf_size) 242 s->wr_index = 0; 243 244 if (s->wr_index == s->rd_index) { 245 s->rd_index += 3; 246 if (s->rd_index >= s->buf_size) 247 s->rd_index = 0; 248 } else 249 s->block_count++; 250 251 if (debug > 3) 252 dprintk("%d blocks total.\n", s->block_count); 253 } 254 255 static void saa6588_i2c_poll(struct saa6588 *s) 256 { 257 struct i2c_client *client = v4l2_get_subdevdata(&s->sd); 258 unsigned long flags; 259 unsigned char tmpbuf[6]; 260 unsigned char blocknum; 261 unsigned char tmp; 262 263 /* Although we only need 3 bytes, we have to read at least 6. 264 SAA6588 returns garbage otherwise. */ 265 if (6 != i2c_master_recv(client, &tmpbuf[0], 6)) { 266 if (debug > 1) 267 dprintk(PREFIX "read error!\n"); 268 return; 269 } 270 271 s->sync = tmpbuf[0] & 0x10; 272 if (!s->sync) 273 return; 274 blocknum = tmpbuf[0] >> 5; 275 if (blocknum == s->last_blocknum) { 276 if (debug > 3) 277 dprintk("Saw block %d again.\n", blocknum); 278 return; 279 } 280 281 s->last_blocknum = blocknum; 282 283 /* 284 Byte order according to v4l2 specification: 285 286 Byte 0: Least Significant Byte of RDS Block 287 Byte 1: Most Significant Byte of RDS Block 288 Byte 2 Bit 7: Error bit. Indicates that an uncorrectable error 289 occurred during reception of this block. 290 Bit 6: Corrected bit. Indicates that an error was 291 corrected for this data block. 292 Bits 5-3: Same as bits 0-2. 293 Bits 2-0: Block number. 294 295 SAA6588 byte order is Status-MSB-LSB, so we have to swap the 296 first and the last of the 3 bytes block. 297 */ 298 299 tmp = tmpbuf[2]; 300 tmpbuf[2] = tmpbuf[0]; 301 tmpbuf[0] = tmp; 302 303 /* Map 'Invalid block E' to 'Invalid Block' */ 304 if (blocknum == 6) 305 blocknum = V4L2_RDS_BLOCK_INVALID; 306 /* And if are not in mmbs mode, then 'Block E' is also mapped 307 to 'Invalid Block'. As far as I can tell MMBS is discontinued, 308 and if there is ever a need to support E blocks, then please 309 contact the linux-media mailinglist. */ 310 else if (!mmbs && blocknum == 5) 311 blocknum = V4L2_RDS_BLOCK_INVALID; 312 tmp = blocknum; 313 tmp |= blocknum << 3; /* Received offset == Offset Name (OK ?) */ 314 if ((tmpbuf[2] & 0x03) == 0x03) 315 tmp |= V4L2_RDS_BLOCK_ERROR; /* uncorrectable error */ 316 else if ((tmpbuf[2] & 0x03) != 0x00) 317 tmp |= V4L2_RDS_BLOCK_CORRECTED; /* corrected error */ 318 tmpbuf[2] = tmp; /* Is this enough ? Should we also check other bits ? */ 319 320 spin_lock_irqsave(&s->lock, flags); 321 block_to_buf(s, tmpbuf); 322 spin_unlock_irqrestore(&s->lock, flags); 323 s->data_available_for_read = 1; 324 wake_up_interruptible(&s->read_queue); 325 } 326 327 static void saa6588_work(struct work_struct *work) 328 { 329 struct saa6588 *s = container_of(work, struct saa6588, work.work); 330 331 saa6588_i2c_poll(s); 332 schedule_delayed_work(&s->work, msecs_to_jiffies(20)); 333 } 334 335 static void saa6588_configure(struct saa6588 *s) 336 { 337 struct i2c_client *client = v4l2_get_subdevdata(&s->sd); 338 unsigned char buf[3]; 339 int rc; 340 341 buf[0] = cSyncRestart; 342 if (mmbs) 343 buf[0] |= cProcessingModeRBDS; 344 345 buf[1] = cFlywheelDefault; 346 switch (plvl) { 347 case 0: 348 buf[1] |= cPauseLevel_11mV; 349 break; 350 case 1: 351 buf[1] |= cPauseLevel_17mV; 352 break; 353 case 2: 354 buf[1] |= cPauseLevel_27mV; 355 break; 356 case 3: 357 buf[1] |= cPauseLevel_43mV; 358 break; 359 default: /* nothing */ 360 break; 361 } 362 363 buf[2] = cQualityDetectDefault | cSelectOscFreqON; 364 365 switch (xtal) { 366 case 0: 367 buf[2] |= cOscFreq_4332kHz; 368 break; 369 case 1: 370 buf[2] |= cOscFreq_8664kHz; 371 break; 372 case 2: 373 buf[2] |= cOscFreq_12996kHz; 374 break; 375 case 3: 376 buf[2] |= cOscFreq_17328kHz; 377 break; 378 default: /* nothing */ 379 break; 380 } 381 382 dprintk(PREFIX "writing: 0w=0x%02x 1w=0x%02x 2w=0x%02x\n", 383 buf[0], buf[1], buf[2]); 384 385 rc = i2c_master_send(client, buf, 3); 386 if (rc != 3) 387 printk(PREFIX "i2c i/o error: rc == %d (should be 3)\n", rc); 388 } 389 390 /* ---------------------------------------------------------------------- */ 391 392 static long saa6588_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg) 393 { 394 struct saa6588 *s = to_saa6588(sd); 395 struct saa6588_command *a = arg; 396 397 switch (cmd) { 398 /* --- open() for /dev/radio --- */ 399 case SAA6588_CMD_OPEN: 400 a->result = 0; /* return error if chip doesn't work ??? */ 401 break; 402 /* --- close() for /dev/radio --- */ 403 case SAA6588_CMD_CLOSE: 404 s->data_available_for_read = 1; 405 wake_up_interruptible(&s->read_queue); 406 a->result = 0; 407 break; 408 /* --- read() for /dev/radio --- */ 409 case SAA6588_CMD_READ: 410 read_from_buf(s, a); 411 break; 412 /* --- poll() for /dev/radio --- */ 413 case SAA6588_CMD_POLL: 414 a->result = 0; 415 if (s->data_available_for_read) { 416 a->result |= POLLIN | POLLRDNORM; 417 } 418 poll_wait(a->instance, &s->read_queue, a->event_list); 419 break; 420 421 default: 422 /* nothing */ 423 return -ENOIOCTLCMD; 424 } 425 return 0; 426 } 427 428 static int saa6588_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt) 429 { 430 struct saa6588 *s = to_saa6588(sd); 431 432 vt->capability |= V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO; 433 if (s->sync) 434 vt->rxsubchans |= V4L2_TUNER_SUB_RDS; 435 return 0; 436 } 437 438 static int saa6588_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt) 439 { 440 struct saa6588 *s = to_saa6588(sd); 441 442 saa6588_configure(s); 443 return 0; 444 } 445 446 static int saa6588_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 447 { 448 struct i2c_client *client = v4l2_get_subdevdata(sd); 449 450 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_SAA6588, 0); 451 } 452 453 /* ----------------------------------------------------------------------- */ 454 455 static const struct v4l2_subdev_core_ops saa6588_core_ops = { 456 .g_chip_ident = saa6588_g_chip_ident, 457 .ioctl = saa6588_ioctl, 458 }; 459 460 static const struct v4l2_subdev_tuner_ops saa6588_tuner_ops = { 461 .g_tuner = saa6588_g_tuner, 462 .s_tuner = saa6588_s_tuner, 463 }; 464 465 static const struct v4l2_subdev_ops saa6588_ops = { 466 .core = &saa6588_core_ops, 467 .tuner = &saa6588_tuner_ops, 468 }; 469 470 /* ---------------------------------------------------------------------- */ 471 472 static int saa6588_probe(struct i2c_client *client, 473 const struct i2c_device_id *id) 474 { 475 struct saa6588 *s; 476 struct v4l2_subdev *sd; 477 478 v4l_info(client, "saa6588 found @ 0x%x (%s)\n", 479 client->addr << 1, client->adapter->name); 480 481 s = kzalloc(sizeof(*s), GFP_KERNEL); 482 if (s == NULL) 483 return -ENOMEM; 484 485 s->buf_size = bufblocks * 3; 486 487 s->buffer = kmalloc(s->buf_size, GFP_KERNEL); 488 if (s->buffer == NULL) { 489 kfree(s); 490 return -ENOMEM; 491 } 492 sd = &s->sd; 493 v4l2_i2c_subdev_init(sd, client, &saa6588_ops); 494 spin_lock_init(&s->lock); 495 s->block_count = 0; 496 s->wr_index = 0; 497 s->rd_index = 0; 498 s->last_blocknum = 0xff; 499 init_waitqueue_head(&s->read_queue); 500 s->data_available_for_read = 0; 501 502 saa6588_configure(s); 503 504 /* start polling via eventd */ 505 INIT_DELAYED_WORK(&s->work, saa6588_work); 506 schedule_delayed_work(&s->work, 0); 507 return 0; 508 } 509 510 static int saa6588_remove(struct i2c_client *client) 511 { 512 struct v4l2_subdev *sd = i2c_get_clientdata(client); 513 struct saa6588 *s = to_saa6588(sd); 514 515 v4l2_device_unregister_subdev(sd); 516 517 cancel_delayed_work_sync(&s->work); 518 519 kfree(s->buffer); 520 kfree(s); 521 return 0; 522 } 523 524 /* ----------------------------------------------------------------------- */ 525 526 static const struct i2c_device_id saa6588_id[] = { 527 { "saa6588", 0 }, 528 { } 529 }; 530 MODULE_DEVICE_TABLE(i2c, saa6588_id); 531 532 static struct i2c_driver saa6588_driver = { 533 .driver = { 534 .owner = THIS_MODULE, 535 .name = "saa6588", 536 }, 537 .probe = saa6588_probe, 538 .remove = saa6588_remove, 539 .id_table = saa6588_id, 540 }; 541 542 module_i2c_driver(saa6588_driver); 543