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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Driver for the Conexant CX25821 PCIe bridge
   4 *
   5 *  Copyright (C) 2009 Conexant Systems Inc.
   6 *  Authors  <shu.lin@conexant.com>, <hiep.huynh@conexant.com>
   7 *      Based on SAA713x ALSA driver and CX88 driver
   8 */
   9
  10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/device.h>
  15#include <linux/interrupt.h>
  16#include <linux/vmalloc.h>
  17#include <linux/dma-mapping.h>
  18#include <linux/pci.h>
  19#include <linux/slab.h>
  20
  21#include <linux/delay.h>
  22#include <sound/core.h>
  23#include <sound/pcm.h>
  24#include <sound/pcm_params.h>
  25#include <sound/control.h>
  26#include <sound/initval.h>
  27#include <sound/tlv.h>
  28
  29#include "cx25821.h"
  30#include "cx25821-reg.h"
  31
  32#define AUDIO_SRAM_CHANNEL      SRAM_CH08
  33
  34#define dprintk(level, fmt, arg...)                             \
  35do {                                                            \
  36        if (debug >= level)                                     \
  37                pr_info("%s/1: " fmt, chip->dev->name, ##arg);  \
  38} while (0)
  39#define dprintk_core(level, fmt, arg...)                                \
  40do {                                                                    \
  41        if (debug >= level)                                             \
  42                printk(KERN_DEBUG "%s/1: " fmt, chip->dev->name, ##arg); \
  43} while (0)
  44
  45/****************************************************************************
  46        Data type declarations - Can be moded to a header file later
  47 ****************************************************************************/
  48
  49static int devno;
  50
  51struct cx25821_audio_buffer {
  52        unsigned int bpl;
  53        struct cx25821_riscmem risc;
  54        void                    *vaddr;
  55        struct scatterlist      *sglist;
  56        int                     sglen;
  57        int                     nr_pages;
  58};
  59
  60struct cx25821_audio_dev {
  61        struct cx25821_dev *dev;
  62        struct cx25821_dmaqueue q;
  63
  64        /* pci i/o */
  65        struct pci_dev *pci;
  66
  67        /* audio controls */
  68        int irq;
  69
  70        struct snd_card *card;
  71
  72        unsigned long iobase;
  73        spinlock_t reg_lock;
  74        atomic_t count;
  75
  76        unsigned int dma_size;
  77        unsigned int period_size;
  78        unsigned int num_periods;
  79
  80        struct cx25821_audio_buffer *buf;
  81
  82        struct snd_pcm_substream *substream;
  83};
  84
  85
  86/****************************************************************************
  87                        Module global static vars
  88 ****************************************************************************/
  89
  90static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  91static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  92static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  93
  94module_param_array(enable, bool, NULL, 0444);
  95MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
  96
  97module_param_array(index, int, NULL, 0444);
  98MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
  99
 100/****************************************************************************
 101                                Module macros
 102 ****************************************************************************/
 103
 104MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
 105MODULE_AUTHOR("Hiep Huynh");
 106MODULE_LICENSE("GPL");
 107MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");   /* "{{Conexant,23881}," */
 108
 109static unsigned int debug;
 110module_param(debug, int, 0644);
 111MODULE_PARM_DESC(debug, "enable debug messages");
 112
 113/****************************************************************************
 114                        Module specific functions
 115 ****************************************************************************/
 116/* Constants taken from cx88-reg.h */
 117#define AUD_INT_DN_RISCI1       (1 <<  0)
 118#define AUD_INT_UP_RISCI1       (1 <<  1)
 119#define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
 120#define AUD_INT_DN_RISCI2       (1 <<  4)       /* yes, 3 is skipped */
 121#define AUD_INT_UP_RISCI2       (1 <<  5)
 122#define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
 123#define AUD_INT_DN_SYNC         (1 << 12)
 124#define AUD_INT_UP_SYNC         (1 << 13)
 125#define AUD_INT_RDS_DN_SYNC     (1 << 14)
 126#define AUD_INT_OPC_ERR         (1 << 16)
 127#define AUD_INT_BER_IRQ         (1 << 20)
 128#define AUD_INT_MCHG_IRQ        (1 << 21)
 129#define GP_COUNT_CONTROL_RESET  0x3
 130
 131#define PCI_MSK_AUD_EXT   (1 <<  4)
 132#define PCI_MSK_AUD_INT   (1 <<  3)
 133
 134static int cx25821_alsa_dma_init(struct cx25821_audio_dev *chip, int nr_pages)
 135{
 136        struct cx25821_audio_buffer *buf = chip->buf;
 137        struct page *pg;
 138        int i;
 139
 140        buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
 141        if (NULL == buf->vaddr) {
 142                dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
 143                return -ENOMEM;
 144        }
 145
 146        dprintk(1, "vmalloc is at addr 0x%p, size=%d\n",
 147                                buf->vaddr,
 148                                nr_pages << PAGE_SHIFT);
 149
 150        memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
 151        buf->nr_pages = nr_pages;
 152
 153        buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
 154        if (NULL == buf->sglist)
 155                goto vzalloc_err;
 156
 157        sg_init_table(buf->sglist, buf->nr_pages);
 158        for (i = 0; i < buf->nr_pages; i++) {
 159                pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
 160                if (NULL == pg)
 161                        goto vmalloc_to_page_err;
 162                sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
 163        }
 164        return 0;
 165
 166vmalloc_to_page_err:
 167        vfree(buf->sglist);
 168        buf->sglist = NULL;
 169vzalloc_err:
 170        vfree(buf->vaddr);
 171        buf->vaddr = NULL;
 172        return -ENOMEM;
 173}
 174
 175static int cx25821_alsa_dma_map(struct cx25821_audio_dev *dev)
 176{
 177        struct cx25821_audio_buffer *buf = dev->buf;
 178
 179        buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
 180                        buf->nr_pages, PCI_DMA_FROMDEVICE);
 181
 182        if (0 == buf->sglen) {
 183                pr_warn("%s: cx25821_alsa_map_sg failed\n", __func__);
 184                return -ENOMEM;
 185        }
 186        return 0;
 187}
 188
 189static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev)
 190{
 191        struct cx25821_audio_buffer *buf = dev->buf;
 192
 193        if (!buf->sglen)
 194                return 0;
 195
 196        dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE);
 197        buf->sglen = 0;
 198        return 0;
 199}
 200
 201static int cx25821_alsa_dma_free(struct cx25821_audio_buffer *buf)
 202{
 203        vfree(buf->sglist);
 204        buf->sglist = NULL;
 205        vfree(buf->vaddr);
 206        buf->vaddr = NULL;
 207        return 0;
 208}
 209
 210/*
 211 * BOARD Specific: Sets audio DMA
 212 */
 213
 214static int _cx25821_start_audio_dma(struct cx25821_audio_dev *chip)
 215{
 216        struct cx25821_audio_buffer *buf = chip->buf;
 217        struct cx25821_dev *dev = chip->dev;
 218        const struct sram_channel *audio_ch =
 219            &cx25821_sram_channels[AUDIO_SRAM_CHANNEL];
 220        u32 tmp = 0;
 221
 222        /* enable output on the GPIO 0 for the MCLK ADC (Audio) */
 223        cx25821_set_gpiopin_direction(chip->dev, 0, 0);
 224
 225        /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
 226        cx_clear(AUD_INT_DMA_CTL,
 227                 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
 228
 229        /* setup fifo + format - out channel */
 230        cx25821_sram_channel_setup_audio(chip->dev, audio_ch, buf->bpl,
 231                                         buf->risc.dma);
 232
 233        /* sets bpl size */
 234        cx_write(AUD_A_LNGTH, buf->bpl);
 235
 236        /* reset counter */
 237        /* GP_COUNT_CONTROL_RESET = 0x3 */
 238        cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 239        atomic_set(&chip->count, 0);
 240
 241        /* Set the input mode to 16-bit */
 242        tmp = cx_read(AUD_A_CFG);
 243        cx_write(AUD_A_CFG, tmp | FLD_AUD_DST_PK_MODE | FLD_AUD_DST_ENABLE |
 244                 FLD_AUD_CLK_ENABLE);
 245
 246        /*
 247        pr_info("DEBUG: Start audio DMA, %d B/line, cmds_start(0x%x)= %d lines/FIFO, %d periods, %d byte buffer\n",
 248                buf->bpl, audio_ch->cmds_start,
 249                cx_read(audio_ch->cmds_start + 12)>>1,
 250                chip->num_periods, buf->bpl * chip->num_periods);
 251        */
 252
 253        /* Enables corresponding bits at AUD_INT_STAT */
 254        cx_write(AUD_A_INT_MSK, FLD_AUD_DST_RISCI1 | FLD_AUD_DST_OF |
 255                 FLD_AUD_DST_SYNC | FLD_AUD_DST_OPC_ERR);
 256
 257        /* Clean any pending interrupt bits already set */
 258        cx_write(AUD_A_INT_STAT, ~0);
 259
 260        /* enable audio irqs */
 261        cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
 262
 263        /* Turn on audio downstream fifo and risc enable 0x101 */
 264        tmp = cx_read(AUD_INT_DMA_CTL);
 265        cx_set(AUD_INT_DMA_CTL, tmp |
 266               (FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN));
 267
 268        mdelay(100);
 269        return 0;
 270}
 271
 272/*
 273 * BOARD Specific: Resets audio DMA
 274 */
 275static int _cx25821_stop_audio_dma(struct cx25821_audio_dev *chip)
 276{
 277        struct cx25821_dev *dev = chip->dev;
 278
 279        /* stop dma */
 280        cx_clear(AUD_INT_DMA_CTL,
 281                 FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
 282
 283        /* disable irqs */
 284        cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
 285        cx_clear(AUD_A_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 286                 AUD_INT_DN_RISCI2 | AUD_INT_DN_RISCI1);
 287
 288        return 0;
 289}
 290
 291#define MAX_IRQ_LOOP 50
 292
 293/*
 294 * BOARD Specific: IRQ dma bits
 295 */
 296static char *cx25821_aud_irqs[32] = {
 297        "dn_risci1", "up_risci1", "rds_dn_risc1",       /* 0-2 */
 298        NULL,                                           /* reserved */
 299        "dn_risci2", "up_risci2", "rds_dn_risc2",       /* 4-6 */
 300        NULL,                                           /* reserved */
 301        "dnf_of", "upf_uf", "rds_dnf_uf",               /* 8-10 */
 302        NULL,                                           /* reserved */
 303        "dn_sync", "up_sync", "rds_dn_sync",            /* 12-14 */
 304        NULL,                                           /* reserved */
 305        "opc_err", "par_err", "rip_err",                /* 16-18 */
 306        "pci_abort", "ber_irq", "mchg_irq"              /* 19-21 */
 307};
 308
 309/*
 310 * BOARD Specific: Threats IRQ audio specific calls
 311 */
 312static void cx25821_aud_irq(struct cx25821_audio_dev *chip, u32 status,
 313                            u32 mask)
 314{
 315        struct cx25821_dev *dev = chip->dev;
 316
 317        if (0 == (status & mask))
 318                return;
 319
 320        cx_write(AUD_A_INT_STAT, status);
 321        if (debug > 1 || (status & mask & ~0xff))
 322                cx25821_print_irqbits(dev->name, "irq aud", cx25821_aud_irqs,
 323                                ARRAY_SIZE(cx25821_aud_irqs), status, mask);
 324
 325        /* risc op code error */
 326        if (status & AUD_INT_OPC_ERR) {
 327                pr_warn("WARNING %s/1: Audio risc op code error\n", dev->name);
 328
 329                cx_clear(AUD_INT_DMA_CTL,
 330                         FLD_AUD_DST_A_RISC_EN | FLD_AUD_DST_A_FIFO_EN);
 331                cx25821_sram_channel_dump_audio(dev,
 332                                &cx25821_sram_channels[AUDIO_SRAM_CHANNEL]);
 333        }
 334        if (status & AUD_INT_DN_SYNC) {
 335                pr_warn("WARNING %s: Downstream sync error!\n", dev->name);
 336                cx_write(AUD_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 337                return;
 338        }
 339
 340        /* risc1 downstream */
 341        if (status & AUD_INT_DN_RISCI1) {
 342                atomic_set(&chip->count, cx_read(AUD_A_GPCNT));
 343                snd_pcm_period_elapsed(chip->substream);
 344        }
 345}
 346
 347/*
 348 * BOARD Specific: Handles IRQ calls
 349 */
 350static irqreturn_t cx25821_irq(int irq, void *dev_id)
 351{
 352        struct cx25821_audio_dev *chip = dev_id;
 353        struct cx25821_dev *dev = chip->dev;
 354        u32 status, pci_status;
 355        u32 audint_status, audint_mask;
 356        int loop, handled = 0;
 357
 358        audint_status = cx_read(AUD_A_INT_STAT);
 359        audint_mask = cx_read(AUD_A_INT_MSK);
 360        status = cx_read(PCI_INT_STAT);
 361
 362        for (loop = 0; loop < 1; loop++) {
 363                status = cx_read(PCI_INT_STAT);
 364                if (0 == status) {
 365                        status = cx_read(PCI_INT_STAT);
 366                        audint_status = cx_read(AUD_A_INT_STAT);
 367                        audint_mask = cx_read(AUD_A_INT_MSK);
 368
 369                        if (status) {
 370                                handled = 1;
 371                                cx_write(PCI_INT_STAT, status);
 372
 373                                cx25821_aud_irq(chip, audint_status,
 374                                                audint_mask);
 375                                break;
 376                        } else {
 377                                goto out;
 378                        }
 379                }
 380
 381                handled = 1;
 382                cx_write(PCI_INT_STAT, status);
 383
 384                cx25821_aud_irq(chip, audint_status, audint_mask);
 385        }
 386
 387        pci_status = cx_read(PCI_INT_STAT);
 388
 389        if (handled)
 390                cx_write(PCI_INT_STAT, pci_status);
 391
 392out:
 393        return IRQ_RETVAL(handled);
 394}
 395
 396static int dsp_buffer_free(struct cx25821_audio_dev *chip)
 397{
 398        struct cx25821_riscmem *risc = &chip->buf->risc;
 399
 400        BUG_ON(!chip->dma_size);
 401
 402        dprintk(2, "Freeing buffer\n");
 403        cx25821_alsa_dma_unmap(chip);
 404        cx25821_alsa_dma_free(chip->buf);
 405        pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma);
 406        kfree(chip->buf);
 407
 408        chip->buf = NULL;
 409        chip->dma_size = 0;
 410
 411        return 0;
 412}
 413
 414/****************************************************************************
 415                                ALSA PCM Interface
 416 ****************************************************************************/
 417
 418/*
 419 * Digital hardware definition
 420 */
 421#define DEFAULT_FIFO_SIZE       384
 422static const struct snd_pcm_hardware snd_cx25821_digital_hw = {
 423        .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 424                SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID,
 425        .formats = SNDRV_PCM_FMTBIT_S16_LE,
 426
 427        .rates = SNDRV_PCM_RATE_48000,
 428        .rate_min = 48000,
 429        .rate_max = 48000,
 430        .channels_min = 2,
 431        .channels_max = 2,
 432        /* Analog audio output will be full of clicks and pops if there
 433           are not exactly four lines in the SRAM FIFO buffer.  */
 434        .period_bytes_min = DEFAULT_FIFO_SIZE / 3,
 435        .period_bytes_max = DEFAULT_FIFO_SIZE / 3,
 436        .periods_min = 1,
 437        .periods_max = AUDIO_LINE_SIZE,
 438        /* 128 * 128 = 16384 = 1024 * 16 */
 439        .buffer_bytes_max = (AUDIO_LINE_SIZE * AUDIO_LINE_SIZE),
 440};
 441
 442/*
 443 * audio pcm capture open callback
 444 */
 445static int snd_cx25821_pcm_open(struct snd_pcm_substream *substream)
 446{
 447        struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
 448        struct snd_pcm_runtime *runtime = substream->runtime;
 449        int err;
 450        unsigned int bpl = 0;
 451
 452        if (!chip) {
 453                pr_err("DEBUG: cx25821 can't find device struct. Can't proceed with open\n");
 454                return -ENODEV;
 455        }
 456
 457        err = snd_pcm_hw_constraint_pow2(runtime, 0,
 458                                         SNDRV_PCM_HW_PARAM_PERIODS);
 459        if (err < 0)
 460                goto _error;
 461
 462        chip->substream = substream;
 463
 464        runtime->hw = snd_cx25821_digital_hw;
 465
 466        if (cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
 467            DEFAULT_FIFO_SIZE) {
 468                /* since there are 3 audio Clusters */
 469                bpl = cx25821_sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 3;
 470                bpl &= ~7;      /* must be multiple of 8 */
 471
 472                if (bpl > AUDIO_LINE_SIZE)
 473                        bpl = AUDIO_LINE_SIZE;
 474
 475                runtime->hw.period_bytes_min = bpl;
 476                runtime->hw.period_bytes_max = bpl;
 477        }
 478
 479        return 0;
 480_error:
 481        dprintk(1, "Error opening PCM!\n");
 482        return err;
 483}
 484
 485/*
 486 * audio close callback
 487 */
 488static int snd_cx25821_close(struct snd_pcm_substream *substream)
 489{
 490        return 0;
 491}
 492
 493/*
 494 * hw_params callback
 495 */
 496static int snd_cx25821_hw_params(struct snd_pcm_substream *substream,
 497                                 struct snd_pcm_hw_params *hw_params)
 498{
 499        struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
 500        struct cx25821_audio_buffer *buf;
 501        int ret;
 502
 503        if (substream->runtime->dma_area) {
 504                dsp_buffer_free(chip);
 505                substream->runtime->dma_area = NULL;
 506        }
 507
 508        chip->period_size = params_period_bytes(hw_params);
 509        chip->num_periods = params_periods(hw_params);
 510        chip->dma_size = chip->period_size * params_periods(hw_params);
 511
 512        BUG_ON(!chip->dma_size);
 513        BUG_ON(chip->num_periods & (chip->num_periods - 1));
 514
 515        buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 516        if (NULL == buf)
 517                return -ENOMEM;
 518
 519        if (chip->period_size > AUDIO_LINE_SIZE)
 520                chip->period_size = AUDIO_LINE_SIZE;
 521
 522        buf->bpl = chip->period_size;
 523        chip->buf = buf;
 524
 525        ret = cx25821_alsa_dma_init(chip,
 526                        (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
 527        if (ret < 0)
 528                goto error;
 529
 530        ret = cx25821_alsa_dma_map(chip);
 531        if (ret < 0)
 532                goto error;
 533
 534        ret = cx25821_risc_databuffer_audio(chip->pci, &buf->risc, buf->sglist,
 535                        chip->period_size, chip->num_periods, 1);
 536        if (ret < 0) {
 537                pr_info("DEBUG: ERROR after cx25821_risc_databuffer_audio()\n");
 538                goto error;
 539        }
 540
 541        /* Loop back to start of program */
 542        buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
 543        buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 544        buf->risc.jmp[2] = cpu_to_le32(0);      /* bits 63-32 */
 545
 546        substream->runtime->dma_area = chip->buf->vaddr;
 547        substream->runtime->dma_bytes = chip->dma_size;
 548        substream->runtime->dma_addr = 0;
 549
 550        return 0;
 551
 552error:
 553        chip->buf = NULL;
 554        kfree(buf);
 555        return ret;
 556}
 557
 558/*
 559 * hw free callback
 560 */
 561static int snd_cx25821_hw_free(struct snd_pcm_substream *substream)
 562{
 563        struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
 564
 565        if (substream->runtime->dma_area) {
 566                dsp_buffer_free(chip);
 567                substream->runtime->dma_area = NULL;
 568        }
 569
 570        return 0;
 571}
 572
 573/*
 574 * prepare callback
 575 */
 576static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
 577{
 578        return 0;
 579}
 580
 581/*
 582 * trigger callback
 583 */
 584static int snd_cx25821_card_trigger(struct snd_pcm_substream *substream,
 585                                    int cmd)
 586{
 587        struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
 588        int err = 0;
 589
 590        /* Local interrupts are already disabled by ALSA */
 591        spin_lock(&chip->reg_lock);
 592
 593        switch (cmd) {
 594        case SNDRV_PCM_TRIGGER_START:
 595                err = _cx25821_start_audio_dma(chip);
 596                break;
 597        case SNDRV_PCM_TRIGGER_STOP:
 598                err = _cx25821_stop_audio_dma(chip);
 599                break;
 600        default:
 601                err = -EINVAL;
 602                break;
 603        }
 604
 605        spin_unlock(&chip->reg_lock);
 606
 607        return err;
 608}
 609
 610/*
 611 * pointer callback
 612 */
 613static snd_pcm_uframes_t snd_cx25821_pointer(struct snd_pcm_substream
 614                                             *substream)
 615{
 616        struct cx25821_audio_dev *chip = snd_pcm_substream_chip(substream);
 617        struct snd_pcm_runtime *runtime = substream->runtime;
 618        u16 count;
 619
 620        count = atomic_read(&chip->count);
 621
 622        return runtime->period_size * (count & (runtime->periods - 1));
 623}
 624
 625/*
 626 * page callback (needed for mmap)
 627 */
 628static struct page *snd_cx25821_page(struct snd_pcm_substream *substream,
 629                                     unsigned long offset)
 630{
 631        void *pageptr = substream->runtime->dma_area + offset;
 632
 633        return vmalloc_to_page(pageptr);
 634}
 635
 636/*
 637 * operators
 638 */
 639static const struct snd_pcm_ops snd_cx25821_pcm_ops = {
 640        .open = snd_cx25821_pcm_open,
 641        .close = snd_cx25821_close,
 642        .ioctl = snd_pcm_lib_ioctl,
 643        .hw_params = snd_cx25821_hw_params,
 644        .hw_free = snd_cx25821_hw_free,
 645        .prepare = snd_cx25821_prepare,
 646        .trigger = snd_cx25821_card_trigger,
 647        .pointer = snd_cx25821_pointer,
 648        .page = snd_cx25821_page,
 649};
 650
 651/*
 652 * ALSA create a PCM device:  Called when initializing the board.
 653 * Sets up the name and hooks up the callbacks
 654 */
 655static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device,
 656                           char *name)
 657{
 658        struct snd_pcm *pcm;
 659        int err;
 660
 661        err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 662        if (err < 0) {
 663                pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);
 664                return err;
 665        }
 666        pcm->private_data = chip;
 667        pcm->info_flags = 0;
 668        strscpy(pcm->name, name, sizeof(pcm->name));
 669        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);
 670
 671        return 0;
 672}
 673
 674/****************************************************************************
 675                        Basic Flow for Sound Devices
 676 ****************************************************************************/
 677
 678/*
 679 * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
 680 * Only boards with eeprom and byte 1 at eeprom=1 have it
 681 */
 682
 683static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = {
 684        {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 685        {0,}
 686};
 687
 688MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
 689
 690/*
 691 * Alsa Constructor - Component probe
 692 */
 693static int cx25821_audio_initdev(struct cx25821_dev *dev)
 694{
 695        struct snd_card *card;
 696        struct cx25821_audio_dev *chip;
 697        int err;
 698
 699        if (devno >= SNDRV_CARDS) {
 700                pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);
 701                return -ENODEV;
 702        }
 703
 704        if (!enable[devno]) {
 705                ++devno;
 706                pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);
 707                return -ENOENT;
 708        }
 709
 710        err = snd_card_new(&dev->pci->dev, index[devno], id[devno],
 711                           THIS_MODULE,
 712                           sizeof(struct cx25821_audio_dev), &card);
 713        if (err < 0) {
 714                pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",
 715                        __func__);
 716                return err;
 717        }
 718
 719        strscpy(card->driver, "cx25821", sizeof(card->driver));
 720
 721        /* Card "creation" */
 722        chip = card->private_data;
 723        spin_lock_init(&chip->reg_lock);
 724
 725        chip->dev = dev;
 726        chip->card = card;
 727        chip->pci = dev->pci;
 728        chip->iobase = pci_resource_start(dev->pci, 0);
 729
 730        chip->irq = dev->pci->irq;
 731
 732        err = request_irq(dev->pci->irq, cx25821_irq,
 733                          IRQF_SHARED, chip->dev->name, chip);
 734
 735        if (err < 0) {
 736                pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,
 737                        dev->pci->irq);
 738                goto error;
 739        }
 740
 741        err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");
 742        if (err < 0) {
 743                pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
 744                        __func__);
 745                goto error;
 746        }
 747
 748        strscpy(card->shortname, "cx25821", sizeof(card->shortname));
 749        sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
 750                chip->iobase, chip->irq);
 751        strscpy(card->mixername, "CX25821", sizeof(card->mixername));
 752
 753        pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,
 754                devno);
 755
 756        err = snd_card_register(card);
 757        if (err < 0) {
 758                pr_info("DEBUG ERROR: cannot register sound card %s\n",
 759                        __func__);
 760                goto error;
 761        }
 762
 763        dev->card = card;
 764        devno++;
 765        return 0;
 766
 767error:
 768        snd_card_free(card);
 769        return err;
 770}
 771
 772/****************************************************************************
 773                                LINUX MODULE INIT
 774 ****************************************************************************/
 775
 776static int cx25821_alsa_exit_callback(struct device *dev, void *data)
 777{
 778        struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 779        struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
 780
 781        snd_card_free(cxdev->card);
 782        return 0;
 783}
 784
 785static void cx25821_audio_fini(void)
 786{
 787        struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
 788        int ret;
 789
 790        ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback);
 791        if (ret)
 792                pr_err("%s failed to find a cx25821 driver.\n", __func__);
 793}
 794
 795static int cx25821_alsa_init_callback(struct device *dev, void *data)
 796{
 797        struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 798        struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
 799
 800        cx25821_audio_initdev(cxdev);
 801        return 0;
 802}
 803
 804/*
 805 * Module initializer
 806 *
 807 * Loops through present saa7134 cards, and assigns an ALSA device
 808 * to each one
 809 *
 810 */
 811static int cx25821_alsa_init(void)
 812{
 813        struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
 814
 815        return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback);
 816
 817}
 818
 819late_initcall(cx25821_alsa_init);
 820module_exit(cx25821_audio_fini);
 821