LXR linux/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...)                             \
  48do {                                                            \
  49        if (debug >= level)                                     \
  50                pr_info("%s/1: " fmt, chip->dev->name, ##arg);  \
  51} while (0)
  52#define dprintk_core(level, fmt, arg...)                                \
  53do {                                                                    \
  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
  62static int devno;
  63
  64struct cx25821_audio_buffer {
  65        unsigned int bpl;
  66        struct btcx_riscmem risc;
  67        struct videobuf_dmabuf dma;
  68};
  69
  70struct 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
 102static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
 103static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
 104static bool enable[SNDRV_CARDS] = { 1, [1 ... (SNDRV_CARDS - 1)] = 1 };
 105
 106module_param_array(enable, bool, NULL, 0444);
 107MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
 108
 109module_param_array(index, int, NULL, 0444);
 110MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
 111
 112/****************************************************************************
 113                                Module macros
 114 ****************************************************************************/
 115
 116MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
 117MODULE_AUTHOR("Hiep Huynh");
 118MODULE_LICENSE("GPL");
 119MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");   /* "{{Conexant,23881}," */
 120
 121static unsigned int debug;
 122module_param(debug, int, 0644);
 123MODULE_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
 149static 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 */
 210static 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 */
 231static 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 */
 247static 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 */
 285static 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
 327out:
 328        return IRQ_RETVAL(handled);
 329}
 330
 331static 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
 355static 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 */
 378static 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 */
 421static int snd_cx25821_close(struct snd_pcm_substream *substream)
 422{
 423        return 0;
 424}
 425
 426/*
 427 * hw_params callback
 428 */
 429static 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
 491error:
 492        kfree(buf);
 493        return ret;
 494}
 495
 496/*
 497 * hw free callback
 498 */
 499static 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 */
 514static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
 515{
 516        return 0;
 517}
 518
 519/*
 520 * trigger callback
 521 */
 522static 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 */
 551static 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 */
 566static 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 */
 577static 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 */
 593static 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
 621static DEFINE_PCI_DEVICE_TABLE(cx25821_audio_pci_tbl) = {
 622        {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 623        {0,}
 624};
 625
 626MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
 627
 628/*
 629 * Alsa Constructor - Component probe
 630 */
 631static 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
 706error:
 707        snd_card_free(card);
 708        return err;
 709}
 710
 711/****************************************************************************
 712                                LINUX MODULE INIT
 713 ****************************************************************************/
 714
 715static 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
 724static 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
 734static 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 */
 750static 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
 758late_initcall(cx25821_alsa_init);
 759module_exit(cx25821_audio_fini);
 760