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...)                             \
  35 do {                                                            \
  36         if (debug >= level)                                     \
  37                 pr_info("%s/1: " fmt, chip->dev->name, ##arg);  \
  38 } while (0)
  39 #define dprintk_core(level, fmt, arg...)                                \
  40 do {                                                                    \
  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
  49 static int devno;
  50
  51 struct 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
  60 struct 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
  90 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  91 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  92 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  93
  94 module_param_array(enable, bool, NULL, 0444);
  95 MODULE_PARM_DESC(enable, "Enable cx25821 soundcard. default enabled.");
  96
  97 module_param_array(index, int, NULL, 0444);
  98 MODULE_PARM_DESC(index, "Index value for cx25821 capture interface(s).");
  99
 100 /****************************************************************************
 101                                 Module macros
 102  ****************************************************************************/
 103
 104 MODULE_DESCRIPTION("ALSA driver module for cx25821 based capture cards");
 105 MODULE_AUTHOR("Hiep Huynh");
 106 MODULE_LICENSE("GPL");
 107 MODULE_SUPPORTED_DEVICE("{{Conexant,25821}");   /* "{{Conexant,23881}," */
 108
 109 static unsigned int debug;
 110 module_param(debug, int, 0644);
 111 MODULE_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
 134 static 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
 166 vmalloc_to_page_err:
 167         vfree(buf->sglist);
 168         buf->sglist = NULL;
 169 vzalloc_err:
 170         vfree(buf->vaddr);
 171         buf->vaddr = NULL;
 172         return -ENOMEM;
 173 }
 174
 175 static 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
 189 static 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
 201 static 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
 214 static 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  */
 275 static 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  */
 296 static 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  */
 312 static 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  */
 350 static 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
 392 out:
 393         return IRQ_RETVAL(handled);
 394 }
 395
 396 static 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
 422 static 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  */
 445 static 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  */
 488 static int snd_cx25821_close(struct snd_pcm_substream *substream)
 489 {
 490         return 0;
 491 }
 492
 493 /*
 494  * hw_params callback
 495  */
 496 static 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
 552 error:
 553         chip->buf = NULL;
 554         kfree(buf);
 555         return ret;
 556 }
 557
 558 /*
 559  * hw free callback
 560  */
 561 static 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  */
 576 static int snd_cx25821_prepare(struct snd_pcm_substream *substream)
 577 {
 578         return 0;
 579 }
 580
 581 /*
 582  * trigger callback
 583  */
 584 static 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  */
 613 static 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  */
 628 static 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  */
 639 static const struct snd_pcm_ops snd_cx25821_pcm_ops = {
 640         .open = snd_cx25821_pcm_open,
 641         .close = snd_cx25821_close,
 642         .hw_params = snd_cx25821_hw_params,
 643         .hw_free = snd_cx25821_hw_free,
 644         .prepare = snd_cx25821_prepare,
 645         .trigger = snd_cx25821_card_trigger,
 646         .pointer = snd_cx25821_pointer,
 647         .page = snd_cx25821_page,
 648 };
 649
 650 /*
 651  * ALSA create a PCM device:  Called when initializing the board.
 652  * Sets up the name and hooks up the callbacks
 653  */
 654 static int snd_cx25821_pcm(struct cx25821_audio_dev *chip, int device,
 655                            char *name)
 656 {
 657         struct snd_pcm *pcm;
 658         int err;
 659
 660         err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 661         if (err < 0) {
 662                 pr_info("ERROR: FAILED snd_pcm_new() in %s\n", __func__);
 663                 return err;
 664         }
 665         pcm->private_data = chip;
 666         pcm->info_flags = 0;
 667         strscpy(pcm->name, name, sizeof(pcm->name));
 668         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx25821_pcm_ops);
 669
 670         return 0;
 671 }
 672
 673 /****************************************************************************
 674                         Basic Flow for Sound Devices
 675  ****************************************************************************/
 676
 677 /*
 678  * PCI ID Table - 14f1:8801 and 14f1:8811 means function 1: Audio
 679  * Only boards with eeprom and byte 1 at eeprom=1 have it
 680  */
 681
 682 static const struct pci_device_id __maybe_unused cx25821_audio_pci_tbl[] = {
 683         {0x14f1, 0x0920, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 684         {0,}
 685 };
 686
 687 MODULE_DEVICE_TABLE(pci, cx25821_audio_pci_tbl);
 688
 689 /*
 690  * Alsa Constructor - Component probe
 691  */
 692 static int cx25821_audio_initdev(struct cx25821_dev *dev)
 693 {
 694         struct snd_card *card;
 695         struct cx25821_audio_dev *chip;
 696         int err;
 697
 698         if (devno >= SNDRV_CARDS) {
 699                 pr_info("DEBUG ERROR: devno >= SNDRV_CARDS %s\n", __func__);
 700                 return -ENODEV;
 701         }
 702
 703         if (!enable[devno]) {
 704                 ++devno;
 705                 pr_info("DEBUG ERROR: !enable[devno] %s\n", __func__);
 706                 return -ENOENT;
 707         }
 708
 709         err = snd_card_new(&dev->pci->dev, index[devno], id[devno],
 710                            THIS_MODULE,
 711                            sizeof(struct cx25821_audio_dev), &card);
 712         if (err < 0) {
 713                 pr_info("DEBUG ERROR: cannot create snd_card_new in %s\n",
 714                         __func__);
 715                 return err;
 716         }
 717
 718         strscpy(card->driver, "cx25821", sizeof(card->driver));
 719
 720         /* Card "creation" */
 721         chip = card->private_data;
 722         spin_lock_init(&chip->reg_lock);
 723
 724         chip->dev = dev;
 725         chip->card = card;
 726         chip->pci = dev->pci;
 727         chip->iobase = pci_resource_start(dev->pci, 0);
 728
 729         chip->irq = dev->pci->irq;
 730
 731         err = request_irq(dev->pci->irq, cx25821_irq,
 732                           IRQF_SHARED, chip->dev->name, chip);
 733
 734         if (err < 0) {
 735                 pr_err("ERROR %s: can't get IRQ %d for ALSA\n", chip->dev->name,
 736                         dev->pci->irq);
 737                 goto error;
 738         }
 739
 740         err = snd_cx25821_pcm(chip, 0, "cx25821 Digital");
 741         if (err < 0) {
 742                 pr_info("DEBUG ERROR: cannot create snd_cx25821_pcm %s\n",
 743                         __func__);
 744                 goto error;
 745         }
 746
 747         strscpy(card->shortname, "cx25821", sizeof(card->shortname));
 748         sprintf(card->longname, "%s at 0x%lx irq %d", chip->dev->name,
 749                 chip->iobase, chip->irq);
 750         strscpy(card->mixername, "CX25821", sizeof(card->mixername));
 751
 752         pr_info("%s/%i: ALSA support for cx25821 boards\n", card->driver,
 753                 devno);
 754
 755         err = snd_card_register(card);
 756         if (err < 0) {
 757                 pr_info("DEBUG ERROR: cannot register sound card %s\n",
 758                         __func__);
 759                 goto error;
 760         }
 761
 762         dev->card = card;
 763         devno++;
 764         return 0;
 765
 766 error:
 767         snd_card_free(card);
 768         return err;
 769 }
 770
 771 /****************************************************************************
 772                                 LINUX MODULE INIT
 773  ****************************************************************************/
 774
 775 static int cx25821_alsa_exit_callback(struct device *dev, void *data)
 776 {
 777         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 778         struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
 779
 780         snd_card_free(cxdev->card);
 781         return 0;
 782 }
 783
 784 static void cx25821_audio_fini(void)
 785 {
 786         struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
 787         int ret;
 788
 789         ret = driver_for_each_device(drv, NULL, NULL, cx25821_alsa_exit_callback);
 790         if (ret)
 791                 pr_err("%s failed to find a cx25821 driver.\n", __func__);
 792 }
 793
 794 static int cx25821_alsa_init_callback(struct device *dev, void *data)
 795 {
 796         struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
 797         struct cx25821_dev *cxdev = get_cx25821(v4l2_dev);
 798
 799         cx25821_audio_initdev(cxdev);
 800         return 0;
 801 }
 802
 803 /*
 804  * Module initializer
 805  *
 806  * Loops through present saa7134 cards, and assigns an ALSA device
 807  * to each one
 808  *
 809  */
 810 static int cx25821_alsa_init(void)
 811 {
 812         struct device_driver *drv = driver_find("cx25821", &pci_bus_type);
 813
 814         return driver_for_each_device(drv, NULL, NULL, cx25821_alsa_init_callback);
 815
 816 }
 817
 818 late_initcall(cx25821_alsa_init);
 819 module_exit(cx25821_audio_fini);