drivers/media/pci/cx25821/cx25821-alsa.c

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