1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * cxd2880-spi.c 4 * Sony CXD2880 DVB-T2/T tuner + demodulator driver 5 * SPI adapter 6 * 7 * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__ 11 12 #include <linux/spi/spi.h> 13 #include <linux/regulator/consumer.h> 14 #include <linux/ktime.h> 15 16 #include <media/dvb_demux.h> 17 #include <media/dmxdev.h> 18 #include <media/dvb_frontend.h> 19 #include "cxd2880.h" 20 21 #define CXD2880_MAX_FILTER_SIZE 32 22 #define BURST_WRITE_MAX 128 23 #define MAX_TRANS_PKT 300 24 25 struct cxd2880_ts_buf_info { 26 u8 read_ready:1; 27 u8 almost_full:1; 28 u8 almost_empty:1; 29 u8 overflow:1; 30 u8 underflow:1; 31 u16 pkt_num; 32 }; 33 34 struct cxd2880_pid_config { 35 u8 is_enable; 36 u16 pid; 37 }; 38 39 struct cxd2880_pid_filter_config { 40 u8 is_negative; 41 struct cxd2880_pid_config pid_config[CXD2880_MAX_FILTER_SIZE]; 42 }; 43 44 struct cxd2880_dvb_spi { 45 struct dvb_frontend dvb_fe; 46 struct dvb_adapter adapter; 47 struct dvb_demux demux; 48 struct dmxdev dmxdev; 49 struct dmx_frontend dmx_fe; 50 struct task_struct *cxd2880_ts_read_thread; 51 struct spi_device *spi; 52 struct mutex spi_mutex; /* For SPI access exclusive control */ 53 int feed_count; 54 int all_pid_feed_count; 55 struct regulator *vcc_supply; 56 u8 *ts_buf; 57 struct cxd2880_pid_filter_config filter_config; 58 }; 59 60 DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr); 61 62 static int cxd2880_write_spi(struct spi_device *spi, u8 *data, u32 size) 63 { 64 struct spi_message msg; 65 struct spi_transfer tx = {}; 66 67 if (!spi || !data) { 68 pr_err("invalid arg\n"); 69 return -EINVAL; 70 } 71 72 tx.tx_buf = data; 73 tx.len = size; 74 75 spi_message_init(&msg); 76 spi_message_add_tail(&tx, &msg); 77 78 return spi_sync(spi, &msg); 79 } 80 81 static int cxd2880_write_reg(struct spi_device *spi, 82 u8 sub_address, const u8 *data, u32 size) 83 { 84 u8 send_data[BURST_WRITE_MAX + 4]; 85 const u8 *write_data_top = NULL; 86 int ret = 0; 87 88 if (!spi || !data) { 89 pr_err("invalid arg\n"); 90 return -EINVAL; 91 } 92 if (size > BURST_WRITE_MAX || size > U8_MAX) { 93 pr_err("data size > WRITE_MAX\n"); 94 return -EINVAL; 95 } 96 97 if (sub_address + size > 0x100) { 98 pr_err("out of range\n"); 99 return -EINVAL; 100 } 101 102 send_data[0] = 0x0e; 103 write_data_top = data; 104 105 send_data[1] = sub_address; 106 send_data[2] = (u8)size; 107 108 memcpy(&send_data[3], write_data_top, send_data[2]); 109 110 ret = cxd2880_write_spi(spi, send_data, send_data[2] + 3); 111 if (ret) 112 pr_err("write spi failed %d\n", ret); 113 114 return ret; 115 } 116 117 static int cxd2880_spi_read_ts(struct spi_device *spi, 118 u8 *read_data, 119 u32 packet_num) 120 { 121 int ret; 122 u8 data[3]; 123 struct spi_message message; 124 struct spi_transfer transfer[2] = {}; 125 126 if (!spi || !read_data || !packet_num) { 127 pr_err("invalid arg\n"); 128 return -EINVAL; 129 } 130 if (packet_num > 0xffff) { 131 pr_err("packet num > 0xffff\n"); 132 return -EINVAL; 133 } 134 135 data[0] = 0x10; 136 data[1] = packet_num >> 8; 137 data[2] = packet_num; 138 139 spi_message_init(&message); 140 141 transfer[0].len = 3; 142 transfer[0].tx_buf = data; 143 spi_message_add_tail(&transfer[0], &message); 144 transfer[1].len = packet_num * 188; 145 transfer[1].rx_buf = read_data; 146 spi_message_add_tail(&transfer[1], &message); 147 148 ret = spi_sync(spi, &message); 149 if (ret) 150 pr_err("spi_sync failed\n"); 151 152 return ret; 153 } 154 155 static int cxd2880_spi_read_ts_buffer_info(struct spi_device *spi, 156 struct cxd2880_ts_buf_info *info) 157 { 158 u8 send_data = 0x20; 159 u8 recv_data[2]; 160 int ret; 161 162 if (!spi || !info) { 163 pr_err("invalid arg\n"); 164 return -EINVAL; 165 } 166 167 ret = spi_write_then_read(spi, &send_data, 1, 168 recv_data, sizeof(recv_data)); 169 if (ret) 170 pr_err("spi_write_then_read failed\n"); 171 172 info->read_ready = (recv_data[0] & 0x80) ? 1 : 0; 173 info->almost_full = (recv_data[0] & 0x40) ? 1 : 0; 174 info->almost_empty = (recv_data[0] & 0x20) ? 1 : 0; 175 info->overflow = (recv_data[0] & 0x10) ? 1 : 0; 176 info->underflow = (recv_data[0] & 0x08) ? 1 : 0; 177 info->pkt_num = ((recv_data[0] & 0x07) << 8) | recv_data[1]; 178 179 return ret; 180 } 181 182 static int cxd2880_spi_clear_ts_buffer(struct spi_device *spi) 183 { 184 u8 data = 0x03; 185 int ret; 186 187 ret = cxd2880_write_spi(spi, &data, 1); 188 189 if (ret) 190 pr_err("write spi failed\n"); 191 192 return ret; 193 } 194 195 static int cxd2880_set_pid_filter(struct spi_device *spi, 196 struct cxd2880_pid_filter_config *cfg) 197 { 198 u8 data[65]; 199 int i; 200 u16 pid = 0; 201 int ret; 202 203 if (!spi) { 204 pr_err("invalid arg\n"); 205 return -EINVAL; 206 } 207 208 data[0] = 0x00; 209 ret = cxd2880_write_reg(spi, 0x00, &data[0], 1); 210 if (ret) 211 return ret; 212 if (!cfg) { 213 data[0] = 0x02; 214 ret = cxd2880_write_reg(spi, 0x50, &data[0], 1); 215 } else { 216 data[0] = cfg->is_negative ? 0x01 : 0x00; 217 218 for (i = 0; i < CXD2880_MAX_FILTER_SIZE; i++) { 219 pid = cfg->pid_config[i].pid; 220 if (cfg->pid_config[i].is_enable) { 221 data[1 + (i * 2)] = (pid >> 8) | 0x20; 222 data[2 + (i * 2)] = pid & 0xff; 223 } else { 224 data[1 + (i * 2)] = 0x00; 225 data[2 + (i * 2)] = 0x00; 226 } 227 } 228 ret = cxd2880_write_reg(spi, 0x50, data, 65); 229 } 230 231 return ret; 232 } 233 234 static int cxd2880_update_pid_filter(struct cxd2880_dvb_spi *dvb_spi, 235 struct cxd2880_pid_filter_config *cfg, 236 bool is_all_pid_filter) 237 { 238 int ret; 239 240 if (!dvb_spi || !cfg) { 241 pr_err("invalid arg.\n"); 242 return -EINVAL; 243 } 244 245 mutex_lock(&dvb_spi->spi_mutex); 246 if (is_all_pid_filter) { 247 struct cxd2880_pid_filter_config tmpcfg; 248 249 memset(&tmpcfg, 0, sizeof(tmpcfg)); 250 tmpcfg.is_negative = 1; 251 tmpcfg.pid_config[0].is_enable = 1; 252 tmpcfg.pid_config[0].pid = 0x1fff; 253 254 ret = cxd2880_set_pid_filter(dvb_spi->spi, &tmpcfg); 255 } else { 256 ret = cxd2880_set_pid_filter(dvb_spi->spi, cfg); 257 } 258 mutex_unlock(&dvb_spi->spi_mutex); 259 260 if (ret) 261 pr_err("set_pid_filter failed\n"); 262 263 return ret; 264 } 265 266 static int cxd2880_ts_read(void *arg) 267 { 268 struct cxd2880_dvb_spi *dvb_spi = NULL; 269 struct cxd2880_ts_buf_info info; 270 ktime_t start; 271 u32 i; 272 int ret; 273 274 dvb_spi = arg; 275 if (!dvb_spi) { 276 pr_err("invalid arg\n"); 277 return -EINVAL; 278 } 279 280 ret = cxd2880_spi_clear_ts_buffer(dvb_spi->spi); 281 if (ret) { 282 pr_err("set_clear_ts_buffer failed\n"); 283 return ret; 284 } 285 286 start = ktime_get(); 287 while (!kthread_should_stop()) { 288 ret = cxd2880_spi_read_ts_buffer_info(dvb_spi->spi, 289 &info); 290 if (ret) { 291 pr_err("spi_read_ts_buffer_info error\n"); 292 return ret; 293 } 294 295 if (info.pkt_num > MAX_TRANS_PKT) { 296 for (i = 0; i < info.pkt_num / MAX_TRANS_PKT; i++) { 297 cxd2880_spi_read_ts(dvb_spi->spi, 298 dvb_spi->ts_buf, 299 MAX_TRANS_PKT); 300 dvb_dmx_swfilter(&dvb_spi->demux, 301 dvb_spi->ts_buf, 302 MAX_TRANS_PKT * 188); 303 } 304 start = ktime_get(); 305 } else if ((info.pkt_num > 0) && 306 (ktime_to_ms(ktime_sub(ktime_get(), start)) >= 500)) { 307 cxd2880_spi_read_ts(dvb_spi->spi, 308 dvb_spi->ts_buf, 309 info.pkt_num); 310 dvb_dmx_swfilter(&dvb_spi->demux, 311 dvb_spi->ts_buf, 312 info.pkt_num * 188); 313 start = ktime_get(); 314 } else { 315 usleep_range(10000, 11000); 316 } 317 } 318 319 return 0; 320 } 321 322 static int cxd2880_start_feed(struct dvb_demux_feed *feed) 323 { 324 int ret = 0; 325 int i = 0; 326 struct dvb_demux *demux = NULL; 327 struct cxd2880_dvb_spi *dvb_spi = NULL; 328 329 if (!feed) { 330 pr_err("invalid arg\n"); 331 return -EINVAL; 332 } 333 334 demux = feed->demux; 335 if (!demux) { 336 pr_err("feed->demux is NULL\n"); 337 return -EINVAL; 338 } 339 dvb_spi = demux->priv; 340 341 if (dvb_spi->feed_count == CXD2880_MAX_FILTER_SIZE) { 342 pr_err("Exceeded maximum PID count (32)."); 343 pr_err("Selected PID cannot be enabled.\n"); 344 return -EINVAL; 345 } 346 347 if (feed->pid == 0x2000) { 348 if (dvb_spi->all_pid_feed_count == 0) { 349 ret = cxd2880_update_pid_filter(dvb_spi, 350 &dvb_spi->filter_config, 351 true); 352 if (ret) { 353 pr_err("update pid filter failed\n"); 354 return ret; 355 } 356 } 357 dvb_spi->all_pid_feed_count++; 358 359 pr_debug("all PID feed (count = %d)\n", 360 dvb_spi->all_pid_feed_count); 361 } else { 362 struct cxd2880_pid_filter_config cfgtmp; 363 364 cfgtmp = dvb_spi->filter_config; 365 366 for (i = 0; i < CXD2880_MAX_FILTER_SIZE; i++) { 367 if (cfgtmp.pid_config[i].is_enable == 0) { 368 cfgtmp.pid_config[i].is_enable = 1; 369 cfgtmp.pid_config[i].pid = feed->pid; 370 pr_debug("store PID %d to #%d\n", 371 feed->pid, i); 372 break; 373 } 374 } 375 if (i == CXD2880_MAX_FILTER_SIZE) { 376 pr_err("PID filter is full.\n"); 377 return -EINVAL; 378 } 379 if (!dvb_spi->all_pid_feed_count) 380 ret = cxd2880_update_pid_filter(dvb_spi, 381 &cfgtmp, 382 false); 383 if (ret) 384 return ret; 385 386 dvb_spi->filter_config = cfgtmp; 387 } 388 389 if (dvb_spi->feed_count == 0) { 390 dvb_spi->ts_buf = 391 kmalloc(MAX_TRANS_PKT * 188, 392 GFP_KERNEL | GFP_DMA); 393 if (!dvb_spi->ts_buf) { 394 pr_err("ts buffer allocate failed\n"); 395 memset(&dvb_spi->filter_config, 0, 396 sizeof(dvb_spi->filter_config)); 397 dvb_spi->all_pid_feed_count = 0; 398 return -ENOMEM; 399 } 400 dvb_spi->cxd2880_ts_read_thread = kthread_run(cxd2880_ts_read, 401 dvb_spi, 402 "cxd2880_ts_read"); 403 if (IS_ERR(dvb_spi->cxd2880_ts_read_thread)) { 404 pr_err("kthread_run failed\n"); 405 kfree(dvb_spi->ts_buf); 406 dvb_spi->ts_buf = NULL; 407 memset(&dvb_spi->filter_config, 0, 408 sizeof(dvb_spi->filter_config)); 409 dvb_spi->all_pid_feed_count = 0; 410 return PTR_ERR(dvb_spi->cxd2880_ts_read_thread); 411 } 412 } 413 414 dvb_spi->feed_count++; 415 416 pr_debug("start feed (count %d)\n", dvb_spi->feed_count); 417 return 0; 418 } 419 420 static int cxd2880_stop_feed(struct dvb_demux_feed *feed) 421 { 422 int i = 0; 423 int ret; 424 struct dvb_demux *demux = NULL; 425 struct cxd2880_dvb_spi *dvb_spi = NULL; 426 427 if (!feed) { 428 pr_err("invalid arg\n"); 429 return -EINVAL; 430 } 431 432 demux = feed->demux; 433 if (!demux) { 434 pr_err("feed->demux is NULL\n"); 435 return -EINVAL; 436 } 437 dvb_spi = demux->priv; 438 439 if (!dvb_spi->feed_count) { 440 pr_err("no feed is started\n"); 441 return -EINVAL; 442 } 443 444 if (feed->pid == 0x2000) { 445 /* 446 * Special PID case. 447 * Number of 0x2000 feed request was stored 448 * in dvb_spi->all_pid_feed_count. 449 */ 450 if (dvb_spi->all_pid_feed_count <= 0) { 451 pr_err("PID %d not found\n", feed->pid); 452 return -EINVAL; 453 } 454 dvb_spi->all_pid_feed_count--; 455 } else { 456 struct cxd2880_pid_filter_config cfgtmp; 457 458 cfgtmp = dvb_spi->filter_config; 459 460 for (i = 0; i < CXD2880_MAX_FILTER_SIZE; i++) { 461 if (feed->pid == cfgtmp.pid_config[i].pid && 462 cfgtmp.pid_config[i].is_enable != 0) { 463 cfgtmp.pid_config[i].is_enable = 0; 464 cfgtmp.pid_config[i].pid = 0; 465 pr_debug("removed PID %d from #%d\n", 466 feed->pid, i); 467 break; 468 } 469 } 470 dvb_spi->filter_config = cfgtmp; 471 472 if (i == CXD2880_MAX_FILTER_SIZE) { 473 pr_err("PID %d not found\n", feed->pid); 474 return -EINVAL; 475 } 476 } 477 478 ret = cxd2880_update_pid_filter(dvb_spi, 479 &dvb_spi->filter_config, 480 dvb_spi->all_pid_feed_count > 0); 481 dvb_spi->feed_count--; 482 483 if (dvb_spi->feed_count == 0) { 484 int ret_stop = 0; 485 486 ret_stop = kthread_stop(dvb_spi->cxd2880_ts_read_thread); 487 if (ret_stop) { 488 pr_err("kthread_stop failed. (%d)\n", ret_stop); 489 ret = ret_stop; 490 } 491 kfree(dvb_spi->ts_buf); 492 dvb_spi->ts_buf = NULL; 493 } 494 495 pr_debug("stop feed ok.(count %d)\n", dvb_spi->feed_count); 496 497 return ret; 498 } 499 500 static const struct of_device_id cxd2880_spi_of_match[] = { 501 { .compatible = "sony,cxd2880" }, 502 { /* sentinel */ } 503 }; 504 505 MODULE_DEVICE_TABLE(of, cxd2880_spi_of_match); 506 507 static int 508 cxd2880_spi_probe(struct spi_device *spi) 509 { 510 int ret; 511 struct cxd2880_dvb_spi *dvb_spi = NULL; 512 struct cxd2880_config config; 513 514 if (!spi) { 515 pr_err("invalid arg\n"); 516 return -EINVAL; 517 } 518 519 dvb_spi = kzalloc(sizeof(struct cxd2880_dvb_spi), GFP_KERNEL); 520 if (!dvb_spi) 521 return -ENOMEM; 522 523 dvb_spi->vcc_supply = devm_regulator_get_optional(&spi->dev, "vcc"); 524 if (IS_ERR(dvb_spi->vcc_supply)) { 525 if (PTR_ERR(dvb_spi->vcc_supply) == -EPROBE_DEFER) { 526 ret = -EPROBE_DEFER; 527 goto fail_regulator; 528 } 529 dvb_spi->vcc_supply = NULL; 530 } else { 531 ret = regulator_enable(dvb_spi->vcc_supply); 532 if (ret) 533 goto fail_regulator; 534 } 535 536 dvb_spi->spi = spi; 537 mutex_init(&dvb_spi->spi_mutex); 538 spi_set_drvdata(spi, dvb_spi); 539 config.spi = spi; 540 config.spi_mutex = &dvb_spi->spi_mutex; 541 542 ret = dvb_register_adapter(&dvb_spi->adapter, 543 "CXD2880", 544 THIS_MODULE, 545 &spi->dev, 546 adapter_nr); 547 if (ret < 0) { 548 pr_err("dvb_register_adapter() failed\n"); 549 goto fail_adapter; 550 } 551 552 if (!dvb_attach(cxd2880_attach, &dvb_spi->dvb_fe, &config)) { 553 pr_err("cxd2880_attach failed\n"); 554 ret = -ENODEV; 555 goto fail_attach; 556 } 557 558 ret = dvb_register_frontend(&dvb_spi->adapter, 559 &dvb_spi->dvb_fe); 560 if (ret < 0) { 561 pr_err("dvb_register_frontend() failed\n"); 562 goto fail_frontend; 563 } 564 565 dvb_spi->demux.dmx.capabilities = DMX_TS_FILTERING; 566 dvb_spi->demux.priv = dvb_spi; 567 dvb_spi->demux.filternum = CXD2880_MAX_FILTER_SIZE; 568 dvb_spi->demux.feednum = CXD2880_MAX_FILTER_SIZE; 569 dvb_spi->demux.start_feed = cxd2880_start_feed; 570 dvb_spi->demux.stop_feed = cxd2880_stop_feed; 571 572 ret = dvb_dmx_init(&dvb_spi->demux); 573 if (ret < 0) { 574 pr_err("dvb_dmx_init() failed\n"); 575 goto fail_dmx; 576 } 577 578 dvb_spi->dmxdev.filternum = CXD2880_MAX_FILTER_SIZE; 579 dvb_spi->dmxdev.demux = &dvb_spi->demux.dmx; 580 dvb_spi->dmxdev.capabilities = 0; 581 ret = dvb_dmxdev_init(&dvb_spi->dmxdev, 582 &dvb_spi->adapter); 583 if (ret < 0) { 584 pr_err("dvb_dmxdev_init() failed\n"); 585 goto fail_dmxdev; 586 } 587 588 dvb_spi->dmx_fe.source = DMX_FRONTEND_0; 589 ret = dvb_spi->demux.dmx.add_frontend(&dvb_spi->demux.dmx, 590 &dvb_spi->dmx_fe); 591 if (ret < 0) { 592 pr_err("add_frontend() failed\n"); 593 goto fail_dmx_fe; 594 } 595 596 ret = dvb_spi->demux.dmx.connect_frontend(&dvb_spi->demux.dmx, 597 &dvb_spi->dmx_fe); 598 if (ret < 0) { 599 pr_err("connect_frontend() failed\n"); 600 goto fail_fe_conn; 601 } 602 603 pr_info("Sony CXD2880 has successfully attached.\n"); 604 605 return 0; 606 607 fail_fe_conn: 608 dvb_spi->demux.dmx.remove_frontend(&dvb_spi->demux.dmx, 609 &dvb_spi->dmx_fe); 610 fail_dmx_fe: 611 dvb_dmxdev_release(&dvb_spi->dmxdev); 612 fail_dmxdev: 613 dvb_dmx_release(&dvb_spi->demux); 614 fail_dmx: 615 dvb_unregister_frontend(&dvb_spi->dvb_fe); 616 fail_frontend: 617 dvb_frontend_detach(&dvb_spi->dvb_fe); 618 fail_attach: 619 dvb_unregister_adapter(&dvb_spi->adapter); 620 fail_adapter: 621 if (!dvb_spi->vcc_supply) 622 regulator_disable(dvb_spi->vcc_supply); 623 fail_regulator: 624 kfree(dvb_spi); 625 return ret; 626 } 627 628 static int 629 cxd2880_spi_remove(struct spi_device *spi) 630 { 631 struct cxd2880_dvb_spi *dvb_spi; 632 633 if (!spi) { 634 pr_err("invalid arg\n"); 635 return -EINVAL; 636 } 637 638 dvb_spi = spi_get_drvdata(spi); 639 640 if (!dvb_spi) { 641 pr_err("failed\n"); 642 return -EINVAL; 643 } 644 dvb_spi->demux.dmx.remove_frontend(&dvb_spi->demux.dmx, 645 &dvb_spi->dmx_fe); 646 dvb_dmxdev_release(&dvb_spi->dmxdev); 647 dvb_dmx_release(&dvb_spi->demux); 648 dvb_unregister_frontend(&dvb_spi->dvb_fe); 649 dvb_frontend_detach(&dvb_spi->dvb_fe); 650 dvb_unregister_adapter(&dvb_spi->adapter); 651 652 if (dvb_spi->vcc_supply) 653 regulator_disable(dvb_spi->vcc_supply); 654 655 kfree(dvb_spi); 656 pr_info("cxd2880_spi remove ok.\n"); 657 658 return 0; 659 } 660 661 static const struct spi_device_id cxd2880_spi_id[] = { 662 { "cxd2880", 0 }, 663 { /* sentinel */ } 664 }; 665 MODULE_DEVICE_TABLE(spi, cxd2880_spi_id); 666 667 static struct spi_driver cxd2880_spi_driver = { 668 .driver = { 669 .name = "cxd2880", 670 .of_match_table = cxd2880_spi_of_match, 671 }, 672 .id_table = cxd2880_spi_id, 673 .probe = cxd2880_spi_probe, 674 .remove = cxd2880_spi_remove, 675 }; 676 module_spi_driver(cxd2880_spi_driver); 677 678 MODULE_DESCRIPTION("Sony CXD2880 DVB-T2/T tuner + demod driver SPI adapter"); 679 MODULE_AUTHOR("Sony Semiconductor Solutions Corporation"); 680 MODULE_LICENSE("GPL v2"); 681