1 /* 2 * Driver for the Conexant CX25821 PCIe bridge 3 * 4 * Copyright (C) 2009 Conexant Systems Inc. 5 * Authors <shu.lin@conexant.com>, <hiep.huynh@conexant.com> 6 * Based on SAA713x ALSA driver and CX88 driver 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation, version 2 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25 #include <linux/module.h> 26 #include <linux/init.h> 27 #include <linux/device.h> 28 #include <linux/interrupt.h> 29 #include <linux/vmalloc.h> 30 #include <linux/dma-mapping.h> 31 #include <linux/pci.h> 32 #include <linux/slab.h> 33 34 #include <linux/delay.h> 35 #include <sound/core.h> 36 #include <sound/pcm.h> 37 #include <sound/pcm_params.h> 38 #include <sound/control.h> 39 #include <sound/initval.h> 40 #include <sound/tlv.h> 41 42 #include "cx25821.h" 43 #include "cx25821-reg.h" 44 45 #define AUDIO_SRAM_CHANNEL SRAM_CH08 46 47 #define dprintk(level, fmt, arg...) \ 48 do { \ 49 if (debug >= level) \ 50 pr_info("%s/1: " fmt, chip->dev->name, ##arg); \ 51 } while (0) 52 #define dprintk_core(level, fmt, arg...) \ 53 do { \ 54 if (debug >= level) \ 55 printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \ 56 } while (0) 57 58 /**************************************************************************** 59 Data type declarations - Can be moded to a header file later 60 ****************************************************************************/ 61 62 static int devno; 63 64 struct cx25821_audio_buffer { 65 unsigned int bpl; 66 struct cx25821_riscmem risc; 67 void *vaddr; 68 struct scatterlist *sglist; 69 int sglen; 70 int nr_pages; 71 }; 72 73 struct cx25821_audio_dev { 74 struct cx25821_dev *dev; 75 struct cx25821_dmaqueue q; 76 77 /* pci i/o */ 78 struct pci_dev *pci; 79 80 /* audio controls */ 81 int irq; 82 83 struct snd_card *card; 84 85 unsigned long iobase; 86 spinlock_t reg_lock; 87 atomic_t count; 88 89 unsigned int dma_size; 90 unsigned int period_size; 91 unsigned int num_periods; 92 93 struct cx25821_audio_buffer *buf; 94 95 struct snd_pcm_substream *substream; 96 }; 97 98 99 /**************************************************************************** 100 Module global static vars 101 ****************************************************************************/ 102 103 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ 104 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ 105 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; 106 107 module_param_array(enable, bool, NULL, 0444); 108 MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled."); 109 110 module_param_array(index, int, NULL, 0444); 111 MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s)."); 112 113 /**************************************************************************** 114 Module macros 115 ****************************************************************************/ 116 117 MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards"); 118 MODULE_AUTHOR("Hiep Huynh"); 119 MODULE_LICENSE("GPL"); 120 MODULE_SUPPORTED_DEVICE("{{Conexant,25821}"); /* "{{Conexant,23881}," */ 121 122 static unsigned int debug; 123 module_param(debug, int, 0644); 124 MODULE_PARM_DESC(debug, "enable debug messages"); 125 126 /**************************************************************************** 127 Module specific funtions 128 ****************************************************************************/ 129 /* Constants taken from cx88-reg.h */ 130 #define AUD_INT_DN_RISCI1 (1 << 0) 131 #define AUD_INT_UP_RISCI1 (1 << 1) 132 #define AUD_INT_RDS_DN_RISCI1 (1 << 2) 133 #define AUD_INT_DN_RISCI2 (1 << 4) /* yes, 3 is skipped */ 134 #define AUD_INT_UP_RISCI2 (1 << 5) 135 #define AUD_INT_RDS_DN_RISCI2 (1 << 6) 136 #define AUD_INT_DN_SYNC (1 << 12) 137 #define AUD_INT_UP_SYNC (1 << 13) 138 #define AUD_INT_RDS_DN_SYNC (1 << 14) 139 #define AUD_INT_OPC_ERR (1 << 16) 140 #define AUD_INT_BER_IRQ (1 << 20) 141 #define AUD_INT_MCHG_IRQ (1 << 21) 142 #define GP_COUNT_CONTROL_RESET 0x3 143 144 #define PCI_MSK_AUD_EXT (1 << 4) 145 #define PCI_MSK_AUD_INT (1 << 3) 146 147 static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip, int nr_pages) 148 { 149 struct cx25821_audio_buffer *buf = chip->buf; 150 struct page *pg; 151 int i; 152 153 buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT); 154 if (NULL == buf->vaddr) { 155 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages); 156 return -ENOMEM; 157 } 158 159 dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n", 160 (unsigned long)buf->vaddr, 161 nr_pages << PAGE_SHIFT); 162 163 memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT); 164 buf->nr_pages = nr_pages; 165 166 buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist)); 167 if (NULL == buf->sglist) 168 goto vzalloc_err; 169 170 sg_init_table(buf->sglist, buf->nr_pages); 171 for (i = 0; i < buf->nr_pages; i++) { 172 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE); 173 if (NULL == pg) 174 goto vmalloc_to_page_err; 175 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0); 176 } 177 return 0; 178 179 vmalloc_to_page_err: 180 vfree(buf->sglist); 181 buf->sglist = NULL; 182 vzalloc_err: 183 vfree(buf->vaddr); 184 buf->vaddr = NULL; 185 return -ENOMEM; 186 } 187 188 static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev) 189 { 190 struct cx25821_audio_buffer *buf = dev->buf; 191 192 buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist, 193 buf->nr_pages, PCI_DMA_FROMDEVICE); 194 195 if (0 == buf->sglen) { 196 pr_warn("%s: cx25821_alsa_map_sg failed\n", __func__); 197 return -ENOMEM; 198 } 199 return 0; 200 } 201 202 static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev) 203 { 204 struct cx25821_audio_buffer *buf = dev->buf; 205 206 if (!buf->sglen) 207 return 0; 208 209 dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE); 210 buf->sglen = 0; 211 return 0; 212 } 213 214 static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf) 215 { 216 vfree(buf->sglist); 217 buf->sglist = NULL; 218 vfree(buf->vaddr); 219 buf->vaddr = NULL; 220 return 0; 221 } 222 223 /* 224 * BOARD Specific: Sets audio DMA 225 */ 226 227 static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip) 228 { 229 struct cx25821_audio_buffer *buf = chip->buf; 230 struct cx25821_dev *dev = chip->dev; 231 const struct sram_channel *audio_ch = 232 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]; 233 u32 tmp = 0; 234 235 /* enable output on the GPIO 0 for the MCLK ADC (Audio) */ 236 cx25821_set_gpiopin_direction(chip->dev, 0, 0); 237 238 /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */ 239 cx_clear(AUD_INT_DMA_CTL, 240 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN); 241 242 /* setup fifo + format - out channel */ 243 cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl, 244 buf->risc.dma); 245 246 /* sets bpl size */ 247 cx_write(AUD_A_LNGTH, buf->bpl); 248 249 /* reset counter */ 250 /* GP_COUNT_CONTROL_RESET = 0x3 */ 251 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 252 atomic_set(&chip->count, 0); 253 254 /* Set the input mode to 16-bit */ 255 tmp = cx_read(AUD_A_CFG); 256 cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE | 257 FLD_AUD_CLK_ENABLE); 258 259 /* 260 pr_info("DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d byte buffer\n", 261 buf->bpl, audio_ch->cmds_start, 262 cx_read(audio_ch->cmds_start + 12)>>1, 263 chip->num_periods, buf->bpl * chip->num_periods); 264 */ 265 266 /* Enables corresponding bits at AUD_INT_STAT */ 267 cx_write(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF | 268 FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR); 269 270 /* Clean any pending interrupt bits already set */ 271 cx_write(AUD_A_INT_STAT, ~0); 272 273 /* enable audio irqs */ 274 cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT); 275 276 /* Turn on audio downstream fifo and risc enable 0x101 */ 277 tmp = cx_read(AUD_INT_DMA_CTL); 278 cx_set(AUD_INT_DMA_CTL, tmp | 279 (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN)); 280 281 mdelay(100); 282 return 0; 283 } 284 285 /* 286 * BOARD Specific: Resets audio DMA 287 */ 288 static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip) 289 { 290 struct cx25821_dev *dev = chip->dev; 291 292 /* stop dma */ 293 cx_clear(AUD_INT_DMA_CTL, 294 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN); 295 296 /* disable irqs */ 297 cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT); 298 cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC | 299 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1); 300 301 return 0; 302 } 303 304 #define MAX_IRQ_LOOP 50 305 306 /* 307 * BOARD Specific: IRQ dma bits 308 */ 309 static char *cx25821_aud_irqs[32] = { 310 "dn_risci1", "up_risci1", "rds_dn_risc1", /* 0-2 */ 311 NULL, /* reserved */ 312 "dn_risci2", "up_risci2", "rds_dn_risc2", /* 4-6 */ 313 NULL, /* reserved */ 314 "dnf_of", "upf_uf", "rds_dnf_uf", /* 8-10 */ 315 NULL, /* reserved */ 316 "dn_sync", "up_sync", "rds_dn_sync", /* 12-14 */ 317 NULL, /* reserved */ 318 "opc_err", "par_err", "rip_err", /* 16-18 */ 319 "pci_abort", "ber_irq", "mchg_irq" /* 19-21 */ 320 }; 321 322 /* 323 * BOARD Specific: Threats IRQ audio specific calls 324 */ 325 static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status, 326 u32 mask) 327 { 328 struct cx25821_dev *dev = chip->dev; 329 330 if (0 == (status & mask)) 331 return; 332 333 cx_write(AUD_A_INT_STAT, status); 334 if (debug > 1 || (status & mask & ~0xff)) 335 cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs, 336 ARRAY_SIZE(cx25821_aud_irqs), status, mask); 337 338 /* risc op code error */ 339 if (status & AUD_INT_OPC_ERR) { 340 pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name); 341 342 cx_clear(AUD_INT_DMA_CTL, 343 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN); 344 cx25821_sram_channel_dump_audio(dev, 345 &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]); 346 } 347 if (status & AUD_INT_DN_SYNC) { 348 pr_warn("WARNING %s: Downstream sync error!\n", dev->name); 349 cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET); 350 return; 351 } 352 353 /* risc1 downstream */ 354 if (status & AUD_INT_DN_RISCI1) { 355 atomic_set(&chip->count, cx_read(AUD_A_GPCNT)); 356 snd_pcm_period_elapsed(chip->substream); 357 } 358 } 359 360 /* 361 * BOARD Specific: Handles IRQ calls 362 */ 363 static irqreturn_t cx25821_irq(int irq, void *dev_id) 364 { 365 struct cx25821_audio_dev *chip = dev_id; 366 struct cx25821_dev *dev = chip->dev; 367 u32 status, pci_status; 368 u32 audint_status, audint_mask; 369 int loop, handled = 0; 370 371 audint_status = cx_read(AUD_A_INT_STAT); 372 audint_mask = cx_read(AUD_A_INT_MSK); 373 status = cx_read(PCI_INT_STAT); 374 375 for (loop = 0; loop < 1; loop++) { 376 status = cx_read(PCI_INT_STAT); 377 if (0 == status) { 378 status = cx_read(PCI_INT_STAT); 379 audint_status = cx_read(AUD_A_INT_STAT); 380 audint_mask = cx_read(AUD_A_INT_MSK); 381 382 if (status) { 383 handled = 1; 384 cx_write(PCI_INT_STAT, status); 385 386 cx25821_aud_irq(chip, audint_status, 387 audint_mask); 388 break; 389 } else { 390 goto out; 391 } 392 } 393 394 handled = 1; 395 cx_write(PCI_INT_STAT, status); 396 397 cx25821_aud_irq(chip, audint_status, audint_mask); 398 } 399 400 pci_status = cx_read(PCI_INT_STAT); 401 402 if (handled) 403 cx_write(PCI_INT_STAT, pci_status); 404 405 out: 406 return IRQ_RETVAL(handled); 407 } 408 409 static int dsp_buffer_free(struct cx25821_audio_dev *chip) 410 { 411 struct cx25821_riscmem *risc = &chip->buf->risc; 412 413 BUG_ON(!chip->dma_size); 414 415 dprintk(2, "Freeing buffer\n"); 416 cx25821_alsa_dma_unmap(chip); 417 cx25821_alsa_dma_free(chip->buf); 418 pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma); 419 kfree(chip->buf); 420 421 chip->buf = NULL; 422 chip->dma_size = 0; 423 424 return 0; 425 } 426 427 /**************************************************************************** 428 ALSA PCM Interface 429 ****************************************************************************/ 430 431 /* 432 * Digital hardware definition 433 */ 434 #define DEFAULT_FIFO_SIZE 384 435 static struct snd_pcm_hardware snd_cx25821_digital_hw = { 436 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | 437 SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID, 438 .formats = SNDRV_PCM_FMTBIT_S16_LE, 439 440 .rates = SNDRV_PCM_RATE_48000, 441 .rate_min = 48000, 442 .rate_max = 48000, 443 .channels_min = 2, 444 .channels_max = 2, 445 /* Analog audio output will be full of clicks and pops if there 446 are not exactly four lines in the SRAM FIFO buffer. */ 447 .period_bytes_min = DEFAULT_FIFO_SIZE / 3, 448 .period_bytes_max = DEFAULT_FIFO_SIZE / 3, 449 .periods_min = 1, 450 .periods_max = AUDIO_LINE_SIZE, 451 /* 128 * 128 = 16384 = 1024 * 16 */ 452 .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE), 453 }; 454 455 /* 456 * audio pcm capture open callback 457 */ 458 static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream) 459 { 460 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); 461 struct snd_pcm_runtime *runtime = substream->runtime; 462 int err; 463 unsigned int bpl = 0; 464 465 if (!chip) { 466 pr_err("DEBUG: cx25821 can't find device struct. Can't proceed with open\n"); 467 return -ENODEV; 468 } 469 470 err = snd_pcm_hw_constraint_pow2(runtime, 0, 471 SNDRV_PCM_HW_PARAM_PERIODS); 472 if (err < 0) 473 goto _error; 474 475 chip->substream = substream; 476 477 runtime->hw = snd_cx25821_digital_hw; 478 479 if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size != 480 DEFAULT_FIFO_SIZE) { 481 /* since there are 3 audio Clusters */ 482 bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3; 483 bpl &= ~7; /* must be multiple of 8 */ 484 485 if (bpl > AUDIO_LINE_SIZE) 486 bpl = AUDIO_LINE_SIZE; 487 488 runtime->hw.period_bytes_min = bpl; 489 runtime->hw.period_bytes_max = bpl; 490 } 491 492 return 0; 493 _error: 494 dprintk(1, "Error opening PCM!\n"); 495 return err; 496 } 497 498 /* 499 * audio close callback 500 */ 501 static int snd_cx25821_close(struct snd_pcm_substream *substream) 502 { 503 return 0; 504 } 505 506 /* 507 * hw_params callback 508 */ 509 static int snd_cx25821_hw_params(struct snd_pcm_substream *substream, 510 struct snd_pcm_hw_params *hw_params) 511 { 512 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); 513 struct cx25821_audio_buffer *buf; 514 int ret; 515 516 if (substream->runtime->dma_area) { 517 dsp_buffer_free(chip); 518 substream->runtime->dma_area = NULL; 519 } 520 521 chip->period_size = params_period_bytes(hw_params); 522 chip->num_periods = params_periods(hw_params); 523 chip->dma_size = chip->period_size * params_periods(hw_params); 524 525 BUG_ON(!chip->dma_size); 526 BUG_ON(chip->num_periods & (chip->num_periods - 1)); 527 528 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 529 if (NULL == buf) 530 return -ENOMEM; 531 532 if (chip->period_size > AUDIO_LINE_SIZE) 533 chip->period_size = AUDIO_LINE_SIZE; 534 535 buf->bpl = chip->period_size; 536 chip->buf = buf; 537 538 ret = cx25821_alsa_dma_init(chip, 539 (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT)); 540 if (ret < 0) 541 goto error; 542 543 ret = cx25821_alsa_dma_map(chip); 544 if (ret < 0) 545 goto error; 546 547 ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, buf->sglist, 548 chip->period_size, chip->num_periods, 1); 549 if (ret < 0) { 550 pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n"); 551 goto error; 552 } 553 554 /* Loop back to start of program */ 555 buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC); 556 buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma); 557 buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */ 558 559 substream->runtime->dma_area = chip->buf->vaddr; 560 substream->runtime->dma_bytes = chip->dma_size; 561 substream->runtime->dma_addr = 0; 562 563 return 0; 564 565 error: 566 chip->buf = NULL; 567 kfree(buf); 568 return ret; 569 } 570 571 /* 572 * hw free callback 573 */ 574 static int snd_cx25821_hw_free(struct snd_pcm_substream *substream) 575 { 576 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); 577 578 if (substream->runtime->dma_area) { 579 dsp_buffer_free(chip); 580 substream->runtime->dma_area = NULL; 581 } 582 583 return 0; 584 } 585 586 /* 587 * prepare callback 588 */ 589 static int snd_cx25821_prepare(struct snd_pcm_substream *substream) 590 { 591 return 0; 592 } 593 594 /* 595 * trigger callback 596 */ 597 static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream, 598 int cmd) 599 { 600 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); 601 int err = 0; 602 603 /* Local interrupts are already disabled by ALSA */ 604 spin_lock(&chip->reg_lock); 605 606 switch (cmd) { 607 case SNDRV_PCM_TRIGGER_START: 608 err = _cx25821_start_audio_dma(chip); 609 break; 610 case SNDRV_PCM_TRIGGER_STOP: 611 err = _cx25821_stop_audio_dma(chip); 612 break; 613 default: 614 err = -EINVAL; 615 break; 616 } 617 618 spin_unlock(&chip->reg_lock); 619 620 return err; 621 } 622 623 /* 624 * pointer callback 625 */ 626 static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream 627 *substream) 628 { 629 struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream); 630 struct snd_pcm_runtime *runtime = substream->runtime; 631 u16 count; 632 633 count = atomic_read(&chip->count); 634 635 return runtime->period_size * (count & (runtime->periods - 1)); 636 } 637 638 /* 639 * page callback (needed for mmap) 640 */ 641 static struct page *snd_cx25821_page(struct snd_pcm_substream *substream, 642 unsigned long offset) 643 { 644 void *pageptr = substream->runtime->dma_area + offset; 645 646 return vmalloc_to_page(pageptr); 647 } 648 649 /* 650 * operators 651 */ 652 static struct snd_pcm_ops snd_cx25821_pcm_ops = { 653 .open = snd_cx25821_pcm_open, 654 .close = snd_cx25821_close, 655 .ioctl = snd_pcm_lib_ioctl, 656 .hw_params = snd_cx25821_hw_params, 657 .hw_free = snd_cx25821_hw_free, 658 .prepare = snd_cx25821_prepare, 659 .trigger = snd_cx25821_card_trigger, 660 .pointer = snd_cx25821_pointer, 661 .page = snd_cx25821_page, 662 }; 663 664 /* 665 * ALSA create a PCM device: Called when initializing the board. 666 * Sets up the name and hooks up the callbacks 667 */ 668 static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device, 669 char *name) 670 { 671 struct snd_pcm *pcm; 672 int err; 673 674 err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm); 675 if (err < 0) { 676 pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__); 677 return err; 678 } 679 pcm->private_data = chip; 680 pcm->info_flags = 0; 681 strcpy(pcm->name, name); 682 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops); 683 684 return 0; 685 } 686 687 /**************************************************************************** 688 Basic Flow for Sound Devices 689 ****************************************************************************/ 690 691 /* 692 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio 693 * Only boards with eeprom and byte 1 at eeprom=1 have it 694 */ 695 696 static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = { 697 {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, 698 {0,} 699 }; 700 701 MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl); 702 703 /* 704 * Alsa Constructor - Component probe 705 */ 706 static int cx25821_audio_initdev(struct cx25821_dev *dev) 707 { 708 struct snd_card *card; 709 struct cx25821_audio_dev *chip; 710 int err; 711 712 if (devno >= SNDRV_CARDS) { 713 pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__); 714 return -ENODEV; 715 } 716 717 if (!enable[devno]) { 718 ++devno; 719 pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__); 720 return -ENOENT; 721 } 722 723 err = snd_card_new(&dev->pci->dev, index[devno], id[devno], 724 THIS_MODULE, 725 sizeof(struct cx25821_audio_dev), &card); 726 if (err < 0) { 727 pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n", 728 __func__); 729 return err; 730 } 731 732 strcpy(card->driver, "cx25821"); 733 734 /* Card "creation" */ 735 chip = card->private_data; 736 spin_lock_init(&chip->reg_lock); 737 738 chip->dev = dev; 739 chip->card = card; 740 chip->pci = dev->pci; 741 chip->iobase = pci_resource_start(dev->pci, 0); 742 743 chip->irq = dev->pci->irq; 744 745 err = request_irq(dev->pci->irq, cx25821_irq, 746 IRQF_SHARED, chip->dev->name, chip); 747 748 if (err < 0) { 749 pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name, 750 dev->pci->irq); 751 goto error; 752 } 753 754 err = snd_cx25821_pcm(chip, 0, "cx25821 Digital"); 755 if (err < 0) { 756 pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n", 757 __func__); 758 goto error; 759 } 760 761 strcpy(card->shortname, "cx25821"); 762 sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name, 763 chip->iobase, chip->irq); 764 strcpy(card->mixername, "CX25821"); 765 766 pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver, 767 devno); 768 769 err = snd_card_register(card); 770 if (err < 0) { 771 pr_info("DEBUG ERROR: cannot register sound card %s\n", 772 __func__); 773 goto error; 774 } 775 776 dev->card = card; 777 devno++; 778 return 0; 779 780 error: 781 snd_card_free(card); 782 return err; 783 } 784 785 /**************************************************************************** 786 LINUX MODULE INIT 787 ****************************************************************************/ 788 789 static int cx25821_alsa_exit_callback(struct device *dev, void *data) 790 { 791 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); 792 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev); 793 794 snd_card_free(cxdev->card); 795 return 0; 796 } 797 798 static void cx25821_audio_fini(void) 799 { 800 struct device_driver *drv = driver_find("cx25821", &pci_bus_type); 801 int ret; 802 803 ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback); 804 if (ret) 805 pr_err("%s failed to find a cx25821 driver.\n", __func__); 806 } 807 808 static int cx25821_alsa_init_callback(struct device *dev, void *data) 809 { 810 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev); 811 struct cx25821_dev *cxdev = get_cx25821(v4l2_dev); 812 813 cx25821_audio_initdev(cxdev); 814 return 0; 815 } 816 817 /* 818 * Module initializer 819 * 820 * Loops through present saa7134 cards, and assigns an ALSA device 821 * to each one 822 * 823 */ 824 static int cx25821_alsa_init(void) 825 { 826 struct device_driver *drv = driver_find("cx25821", &pci_bus_type); 827 828 return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback); 829 830 } 831 832 late_initcall(cx25821_alsa_init); 833 module_exit(cx25821_audio_fini); 834