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 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 const 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);