sound/pci/via82xx_modem.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   ALSA modem driver for VIA VT82xx (South Bridge)
   4  *
   5  *   VT82C686A/B/C, VT8233A/C, VT8235
   6  *
   7  *      Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
   8  *                         Tjeerd.Mulder <Tjeerd.Mulder@fujitsu-siemens.com>
   9  *                    2002 Takashi Iwai <tiwai@suse.de>
  10  */
  11
  12 /*
  13  * Changes:
  14  *
  15  * Sep. 2,  2004  Sasha Khapyorsky <sashak@alsa-project.org>
  16  *      Modified from original audio driver 'via82xx.c' to support AC97
  17  *      modems.
  18  */
  19
  20 #include <linux/io.h>
  21 #include <linux/delay.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/init.h>
  24 #include <linux/pci.h>
  25 #include <linux/slab.h>
  26 #include <linux/module.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/info.h>
  31 #include <sound/ac97_codec.h>
  32 #include <sound/initval.h>
  33
  34 #if 0
  35 #define POINTER_DEBUG
  36 #endif
  37
  38 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  39 MODULE_DESCRIPTION("VIA VT82xx modem");
  40 MODULE_LICENSE("GPL");
  41 MODULE_SUPPORTED_DEVICE("{{VIA,VT82C686A/B/C modem,pci}}");
  42
  43 static int index = -2; /* Exclude the first card */
  44 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  45 static int ac97_clock = 48000;
  46
  47 module_param(index, int, 0444);
  48 MODULE_PARM_DESC(index, "Index value for VIA 82xx bridge.");
  49 module_param(id, charp, 0444);
  50 MODULE_PARM_DESC(id, "ID string for VIA 82xx bridge.");
  51 module_param(ac97_clock, int, 0444);
  52 MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
  53
  54 /* just for backward compatibility */
  55 static bool enable;
  56 module_param(enable, bool, 0444);
  57
  58
  59 /*
  60  *  Direct registers
  61  */
  62
  63 #define VIAREG(via, x) ((via)->port + VIA_REG_##x)
  64 #define VIADEV_REG(viadev, x) ((viadev)->port + VIA_REG_##x)
  65
  66 /* common offsets */
  67 #define VIA_REG_OFFSET_STATUS           0x00    /* byte - channel status */
  68 #define   VIA_REG_STAT_ACTIVE           0x80    /* RO */
  69 #define   VIA_REG_STAT_PAUSED           0x40    /* RO */
  70 #define   VIA_REG_STAT_TRIGGER_QUEUED   0x08    /* RO */
  71 #define   VIA_REG_STAT_STOPPED          0x04    /* RWC */
  72 #define   VIA_REG_STAT_EOL              0x02    /* RWC */
  73 #define   VIA_REG_STAT_FLAG             0x01    /* RWC */
  74 #define VIA_REG_OFFSET_CONTROL          0x01    /* byte - channel control */
  75 #define   VIA_REG_CTRL_START            0x80    /* WO */
  76 #define   VIA_REG_CTRL_TERMINATE        0x40    /* WO */
  77 #define   VIA_REG_CTRL_AUTOSTART        0x20
  78 #define   VIA_REG_CTRL_PAUSE            0x08    /* RW */
  79 #define   VIA_REG_CTRL_INT_STOP         0x04
  80 #define   VIA_REG_CTRL_INT_EOL          0x02
  81 #define   VIA_REG_CTRL_INT_FLAG         0x01
  82 #define   VIA_REG_CTRL_RESET            0x01    /* RW - probably reset? undocumented */
  83 #define   VIA_REG_CTRL_INT (VIA_REG_CTRL_INT_FLAG | VIA_REG_CTRL_INT_EOL | VIA_REG_CTRL_AUTOSTART)
  84 #define VIA_REG_OFFSET_TYPE             0x02    /* byte - channel type (686 only) */
  85 #define   VIA_REG_TYPE_AUTOSTART        0x80    /* RW - autostart at EOL */
  86 #define   VIA_REG_TYPE_16BIT            0x20    /* RW */
  87 #define   VIA_REG_TYPE_STEREO           0x10    /* RW */
  88 #define   VIA_REG_TYPE_INT_LLINE        0x00
  89 #define   VIA_REG_TYPE_INT_LSAMPLE      0x04
  90 #define   VIA_REG_TYPE_INT_LESSONE      0x08
  91 #define   VIA_REG_TYPE_INT_MASK         0x0c
  92 #define   VIA_REG_TYPE_INT_EOL          0x02
  93 #define   VIA_REG_TYPE_INT_FLAG         0x01
  94 #define VIA_REG_OFFSET_TABLE_PTR        0x04    /* dword - channel table pointer */
  95 #define VIA_REG_OFFSET_CURR_PTR         0x04    /* dword - channel current pointer */
  96 #define VIA_REG_OFFSET_STOP_IDX         0x08    /* dword - stop index, channel type, sample rate */
  97 #define VIA_REG_OFFSET_CURR_COUNT       0x0c    /* dword - channel current count (24 bit) */
  98 #define VIA_REG_OFFSET_CURR_INDEX       0x0f    /* byte - channel current index (for via8233 only) */
  99
 100 #define DEFINE_VIA_REGSET(name,val) \
 101 enum {\
 102         VIA_REG_##name##_STATUS         = (val),\
 103         VIA_REG_##name##_CONTROL        = (val) + 0x01,\
 104         VIA_REG_##name##_TYPE           = (val) + 0x02,\
 105         VIA_REG_##name##_TABLE_PTR      = (val) + 0x04,\
 106         VIA_REG_##name##_CURR_PTR       = (val) + 0x04,\
 107         VIA_REG_##name##_STOP_IDX       = (val) + 0x08,\
 108         VIA_REG_##name##_CURR_COUNT     = (val) + 0x0c,\
 109 }
 110
 111 /* modem block */
 112 DEFINE_VIA_REGSET(MO, 0x40);
 113 DEFINE_VIA_REGSET(MI, 0x50);
 114
 115 /* AC'97 */
 116 #define VIA_REG_AC97                    0x80    /* dword */
 117 #define   VIA_REG_AC97_CODEC_ID_MASK    (3<<30)
 118 #define   VIA_REG_AC97_CODEC_ID_SHIFT   30
 119 #define   VIA_REG_AC97_CODEC_ID_PRIMARY 0x00
 120 #define   VIA_REG_AC97_CODEC_ID_SECONDARY 0x01
 121 #define   VIA_REG_AC97_SECONDARY_VALID  (1<<27)
 122 #define   VIA_REG_AC97_PRIMARY_VALID    (1<<25)
 123 #define   VIA_REG_AC97_BUSY             (1<<24)
 124 #define   VIA_REG_AC97_READ             (1<<23)
 125 #define   VIA_REG_AC97_CMD_SHIFT        16
 126 #define   VIA_REG_AC97_CMD_MASK         0x7e
 127 #define   VIA_REG_AC97_DATA_SHIFT       0
 128 #define   VIA_REG_AC97_DATA_MASK        0xffff
 129
 130 #define VIA_REG_SGD_SHADOW              0x84    /* dword */
 131 #define   VIA_REG_SGD_STAT_PB_FLAG      (1<<0)
 132 #define   VIA_REG_SGD_STAT_CP_FLAG      (1<<1)
 133 #define   VIA_REG_SGD_STAT_FM_FLAG      (1<<2)
 134 #define   VIA_REG_SGD_STAT_PB_EOL       (1<<4)
 135 #define   VIA_REG_SGD_STAT_CP_EOL       (1<<5)
 136 #define   VIA_REG_SGD_STAT_FM_EOL       (1<<6)
 137 #define   VIA_REG_SGD_STAT_PB_STOP      (1<<8)
 138 #define   VIA_REG_SGD_STAT_CP_STOP      (1<<9)
 139 #define   VIA_REG_SGD_STAT_FM_STOP      (1<<10)
 140 #define   VIA_REG_SGD_STAT_PB_ACTIVE    (1<<12)
 141 #define   VIA_REG_SGD_STAT_CP_ACTIVE    (1<<13)
 142 #define   VIA_REG_SGD_STAT_FM_ACTIVE    (1<<14)
 143 #define   VIA_REG_SGD_STAT_MR_FLAG      (1<<16)
 144 #define   VIA_REG_SGD_STAT_MW_FLAG      (1<<17)
 145 #define   VIA_REG_SGD_STAT_MR_EOL       (1<<20)
 146 #define   VIA_REG_SGD_STAT_MW_EOL       (1<<21)
 147 #define   VIA_REG_SGD_STAT_MR_STOP      (1<<24)
 148 #define   VIA_REG_SGD_STAT_MW_STOP      (1<<25)
 149 #define   VIA_REG_SGD_STAT_MR_ACTIVE    (1<<28)
 150 #define   VIA_REG_SGD_STAT_MW_ACTIVE    (1<<29)
 151
 152 #define VIA_REG_GPI_STATUS              0x88
 153 #define VIA_REG_GPI_INTR                0x8c
 154
 155 #define VIA_TBL_BIT_FLAG        0x40000000
 156 #define VIA_TBL_BIT_EOL         0x80000000
 157
 158 /* pci space */
 159 #define VIA_ACLINK_STAT         0x40
 160 #define  VIA_ACLINK_C11_READY   0x20
 161 #define  VIA_ACLINK_C10_READY   0x10
 162 #define  VIA_ACLINK_C01_READY   0x04 /* secondary codec ready */
 163 #define  VIA_ACLINK_LOWPOWER    0x02 /* low-power state */
 164 #define  VIA_ACLINK_C00_READY   0x01 /* primary codec ready */
 165 #define VIA_ACLINK_CTRL         0x41
 166 #define  VIA_ACLINK_CTRL_ENABLE 0x80 /* 0: disable, 1: enable */
 167 #define  VIA_ACLINK_CTRL_RESET  0x40 /* 0: assert, 1: de-assert */
 168 #define  VIA_ACLINK_CTRL_SYNC   0x20 /* 0: release SYNC, 1: force SYNC hi */
 169 #define  VIA_ACLINK_CTRL_SDO    0x10 /* 0: release SDO, 1: force SDO hi */
 170 #define  VIA_ACLINK_CTRL_VRA    0x08 /* 0: disable VRA, 1: enable VRA */
 171 #define  VIA_ACLINK_CTRL_PCM    0x04 /* 0: disable PCM, 1: enable PCM */
 172 #define  VIA_ACLINK_CTRL_FM     0x02 /* via686 only */
 173 #define  VIA_ACLINK_CTRL_SB     0x01 /* via686 only */
 174 #define  VIA_ACLINK_CTRL_INIT   (VIA_ACLINK_CTRL_ENABLE|\
 175                                  VIA_ACLINK_CTRL_RESET|\
 176                                  VIA_ACLINK_CTRL_PCM)
 177 #define VIA_FUNC_ENABLE         0x42
 178 #define  VIA_FUNC_MIDI_PNP      0x80 /* FIXME: it's 0x40 in the datasheet! */
 179 #define  VIA_FUNC_MIDI_IRQMASK  0x40 /* FIXME: not documented! */
 180 #define  VIA_FUNC_RX2C_WRITE    0x20
 181 #define  VIA_FUNC_SB_FIFO_EMPTY 0x10
 182 #define  VIA_FUNC_ENABLE_GAME   0x08
 183 #define  VIA_FUNC_ENABLE_FM     0x04
 184 #define  VIA_FUNC_ENABLE_MIDI   0x02
 185 #define  VIA_FUNC_ENABLE_SB     0x01
 186 #define VIA_PNP_CONTROL         0x43
 187 #define VIA_MC97_CTRL           0x44
 188 #define  VIA_MC97_CTRL_ENABLE   0x80
 189 #define  VIA_MC97_CTRL_SECONDARY 0x40
 190 #define  VIA_MC97_CTRL_INIT     (VIA_MC97_CTRL_ENABLE|\
 191                                  VIA_MC97_CTRL_SECONDARY)
 192
 193
 194 /*
 195  * pcm stream
 196  */
 197
 198 struct snd_via_sg_table {
 199         unsigned int offset;
 200         unsigned int size;
 201 } ;
 202
 203 #define VIA_TABLE_SIZE  255
 204
 205 struct viadev {
 206         unsigned int reg_offset;
 207         unsigned long port;
 208         int direction;  /* playback = 0, capture = 1 */
 209         struct snd_pcm_substream *substream;
 210         int running;
 211         unsigned int tbl_entries; /* # descriptors */
 212         struct snd_dma_buffer table;
 213         struct snd_via_sg_table *idx_table;
 214         /* for recovery from the unexpected pointer */
 215         unsigned int lastpos;
 216         unsigned int bufsize;
 217         unsigned int bufsize2;
 218 };
 219
 220 enum { TYPE_CARD_VIA82XX_MODEM = 1 };
 221
 222 #define VIA_MAX_MODEM_DEVS      2
 223
 224 struct via82xx_modem {
 225         int irq;
 226
 227         unsigned long port;
 228
 229         unsigned int intr_mask; /* SGD_SHADOW mask to check interrupts */
 230
 231         struct pci_dev *pci;
 232         struct snd_card *card;
 233
 234         unsigned int num_devs;
 235         unsigned int playback_devno, capture_devno;
 236         struct viadev devs[VIA_MAX_MODEM_DEVS];
 237
 238         struct snd_pcm *pcms[2];
 239
 240         struct snd_ac97_bus *ac97_bus;
 241         struct snd_ac97 *ac97;
 242         unsigned int ac97_clock;
 243         unsigned int ac97_secondary;    /* secondary AC'97 codec is present */
 244
 245         spinlock_t reg_lock;
 246         struct snd_info_entry *proc_entry;
 247 };
 248
 249 static const struct pci_device_id snd_via82xx_modem_ids[] = {
 250         { PCI_VDEVICE(VIA, 0x3068), TYPE_CARD_VIA82XX_MODEM, },
 251         { 0, }
 252 };
 253
 254 MODULE_DEVICE_TABLE(pci, snd_via82xx_modem_ids);
 255
 256 /*
 257  */
 258
 259 /*
 260  * allocate and initialize the descriptor buffers
 261  * periods = number of periods
 262  * fragsize = period size in bytes
 263  */
 264 static int build_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
 265                            struct pci_dev *pci,
 266                            unsigned int periods, unsigned int fragsize)
 267 {
 268         unsigned int i, idx, ofs, rest;
 269         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 270         __le32 *pgtbl;
 271
 272         if (dev->table.area == NULL) {
 273                 /* the start of each lists must be aligned to 8 bytes,
 274                  * but the kernel pages are much bigger, so we don't care
 275                  */
 276                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, &chip->pci->dev,
 277                                         PAGE_ALIGN(VIA_TABLE_SIZE * 2 * 8),
 278                                         &dev->table) < 0)
 279                         return -ENOMEM;
 280         }
 281         if (! dev->idx_table) {
 282                 dev->idx_table = kmalloc_array(VIA_TABLE_SIZE,
 283                                                sizeof(*dev->idx_table),
 284                                                GFP_KERNEL);
 285                 if (! dev->idx_table)
 286                         return -ENOMEM;
 287         }
 288
 289         /* fill the entries */
 290         idx = 0;
 291         ofs = 0;
 292         pgtbl = (__le32 *)dev->table.area;
 293         for (i = 0; i < periods; i++) {
 294                 rest = fragsize;
 295                 /* fill descriptors for a period.
 296                  * a period can be split to several descriptors if it's
 297                  * over page boundary.
 298                  */
 299                 do {
 300                         unsigned int r;
 301                         unsigned int flag;
 302                         unsigned int addr;
 303
 304                         if (idx >= VIA_TABLE_SIZE) {
 305                                 dev_err(&pci->dev, "too much table size!\n");
 306                                 return -EINVAL;
 307                         }
 308                         addr = snd_pcm_sgbuf_get_addr(substream, ofs);
 309                         pgtbl[idx << 1] = cpu_to_le32(addr);
 310                         r = PAGE_SIZE - (ofs % PAGE_SIZE);
 311                         if (rest < r)
 312                                 r = rest;
 313                         rest -= r;
 314                         if (! rest) {
 315                                 if (i == periods - 1)
 316                                         flag = VIA_TBL_BIT_EOL; /* buffer boundary */
 317                                 else
 318                                         flag = VIA_TBL_BIT_FLAG; /* period boundary */
 319                         } else
 320                                 flag = 0; /* period continues to the next */
 321                         /*
 322                         dev_dbg(&pci->dev,
 323                                 "tbl %d: at %d  size %d (rest %d)\n",
 324                                 idx, ofs, r, rest);
 325                         */
 326                         pgtbl[(idx<<1) + 1] = cpu_to_le32(r | flag);
 327                         dev->idx_table[idx].offset = ofs;
 328                         dev->idx_table[idx].size = r;
 329                         ofs += r;
 330                         idx++;
 331                 } while (rest > 0);
 332         }
 333         dev->tbl_entries = idx;
 334         dev->bufsize = periods * fragsize;
 335         dev->bufsize2 = dev->bufsize / 2;
 336         return 0;
 337 }
 338
 339
 340 static int clean_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
 341                            struct pci_dev *pci)
 342 {
 343         if (dev->table.area) {
 344                 snd_dma_free_pages(&dev->table);
 345                 dev->table.area = NULL;
 346         }
 347         kfree(dev->idx_table);
 348         dev->idx_table = NULL;
 349         return 0;
 350 }
 351
 352 /*
 353  *  Basic I/O
 354  */
 355
 356 static inline unsigned int snd_via82xx_codec_xread(struct via82xx_modem *chip)
 357 {
 358         return inl(VIAREG(chip, AC97));
 359 }
 360
 361 static inline void snd_via82xx_codec_xwrite(struct via82xx_modem *chip, unsigned int val)
 362 {
 363         outl(val, VIAREG(chip, AC97));
 364 }
 365
 366 static int snd_via82xx_codec_ready(struct via82xx_modem *chip, int secondary)
 367 {
 368         unsigned int timeout = 1000;    /* 1ms */
 369         unsigned int val;
 370
 371         while (timeout-- > 0) {
 372                 udelay(1);
 373                 if (!((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY))
 374                         return val & 0xffff;
 375         }
 376         dev_err(chip->card->dev, "codec_ready: codec %i is not ready [0x%x]\n",
 377                    secondary, snd_via82xx_codec_xread(chip));
 378         return -EIO;
 379 }
 380
 381 static int snd_via82xx_codec_valid(struct via82xx_modem *chip, int secondary)
 382 {
 383         unsigned int timeout = 1000;    /* 1ms */
 384         unsigned int val, val1;
 385         unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
 386                                          VIA_REG_AC97_SECONDARY_VALID;
 387
 388         while (timeout-- > 0) {
 389                 val = snd_via82xx_codec_xread(chip);
 390                 val1 = val & (VIA_REG_AC97_BUSY | stat);
 391                 if (val1 == stat)
 392                         return val & 0xffff;
 393                 udelay(1);
 394         }
 395         return -EIO;
 396 }
 397
 398 static void snd_via82xx_codec_wait(struct snd_ac97 *ac97)
 399 {
 400         struct via82xx_modem *chip = ac97->private_data;
 401         __always_unused int err;
 402         err = snd_via82xx_codec_ready(chip, ac97->num);
 403         /* here we need to wait fairly for long time.. */
 404         msleep(500);
 405 }
 406
 407 static void snd_via82xx_codec_write(struct snd_ac97 *ac97,
 408                                     unsigned short reg,
 409                                     unsigned short val)
 410 {
 411         struct via82xx_modem *chip = ac97->private_data;
 412         unsigned int xval;
 413         if(reg == AC97_GPIO_STATUS) {
 414                 outl(val, VIAREG(chip, GPI_STATUS));
 415                 return;
 416         }
 417         xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
 418         xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
 419         xval |= reg << VIA_REG_AC97_CMD_SHIFT;
 420         xval |= val << VIA_REG_AC97_DATA_SHIFT;
 421         snd_via82xx_codec_xwrite(chip, xval);
 422         snd_via82xx_codec_ready(chip, ac97->num);
 423 }
 424
 425 static unsigned short snd_via82xx_codec_read(struct snd_ac97 *ac97, unsigned short reg)
 426 {
 427         struct via82xx_modem *chip = ac97->private_data;
 428         unsigned int xval, val = 0xffff;
 429         int again = 0;
 430
 431         xval = ac97->num << VIA_REG_AC97_CODEC_ID_SHIFT;
 432         xval |= ac97->num ? VIA_REG_AC97_SECONDARY_VALID : VIA_REG_AC97_PRIMARY_VALID;
 433         xval |= VIA_REG_AC97_READ;
 434         xval |= (reg & 0x7f) << VIA_REG_AC97_CMD_SHIFT;
 435         while (1) {
 436                 if (again++ > 3) {
 437                         dev_err(chip->card->dev,
 438                                 "codec_read: codec %i is not valid [0x%x]\n",
 439                                    ac97->num, snd_via82xx_codec_xread(chip));
 440                         return 0xffff;
 441                 }
 442                 snd_via82xx_codec_xwrite(chip, xval);
 443                 udelay (20);
 444                 if (snd_via82xx_codec_valid(chip, ac97->num) >= 0) {
 445                         udelay(25);
 446                         val = snd_via82xx_codec_xread(chip);
 447                         break;
 448                 }
 449         }
 450         return val & 0xffff;
 451 }
 452
 453 static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
 454 {
 455         outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
 456              VIADEV_REG(viadev, OFFSET_CONTROL));
 457         inb(VIADEV_REG(viadev, OFFSET_CONTROL));
 458         udelay(50);
 459         /* disable interrupts */
 460         outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
 461         /* clear interrupts */
 462         outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
 463         outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
 464         // outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
 465         viadev->lastpos = 0;
 466 }
 467
 468
 469 /*
 470  *  Interrupt handler
 471  */
 472
 473 static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id)
 474 {
 475         struct via82xx_modem *chip = dev_id;
 476         unsigned int status;
 477         unsigned int i;
 478
 479         status = inl(VIAREG(chip, SGD_SHADOW));
 480         if (! (status & chip->intr_mask)) {
 481                 return IRQ_NONE;
 482         }
 483 // _skip_sgd:
 484
 485         /* check status for each stream */
 486         spin_lock(&chip->reg_lock);
 487         for (i = 0; i < chip->num_devs; i++) {
 488                 struct viadev *viadev = &chip->devs[i];
 489                 unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
 490                 c_status &= (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED);
 491                 if (! c_status)
 492                         continue;
 493                 if (viadev->substream && viadev->running) {
 494                         spin_unlock(&chip->reg_lock);
 495                         snd_pcm_period_elapsed(viadev->substream);
 496                         spin_lock(&chip->reg_lock);
 497                 }
 498                 outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
 499         }
 500         spin_unlock(&chip->reg_lock);
 501         return IRQ_HANDLED;
 502 }
 503
 504 /*
 505  *  PCM callbacks
 506  */
 507
 508 /*
 509  * trigger callback
 510  */
 511 static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 512 {
 513         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 514         struct viadev *viadev = substream->runtime->private_data;
 515         unsigned char val = 0;
 516
 517         switch (cmd) {
 518         case SNDRV_PCM_TRIGGER_START:
 519         case SNDRV_PCM_TRIGGER_SUSPEND:
 520                 val |= VIA_REG_CTRL_START;
 521                 viadev->running = 1;
 522                 break;
 523         case SNDRV_PCM_TRIGGER_STOP:
 524                 val = VIA_REG_CTRL_TERMINATE;
 525                 viadev->running = 0;
 526                 break;
 527         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 528                 val |= VIA_REG_CTRL_PAUSE;
 529                 viadev->running = 0;
 530                 break;
 531         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 532                 viadev->running = 1;
 533                 break;
 534         default:
 535                 return -EINVAL;
 536         }
 537         outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
 538         if (cmd == SNDRV_PCM_TRIGGER_STOP)
 539                 snd_via82xx_channel_reset(chip, viadev);
 540         return 0;
 541 }
 542
 543 /*
 544  * pointer callbacks
 545  */
 546
 547 /*
 548  * calculate the linear position at the given sg-buffer index and the rest count
 549  */
 550
 551 #define check_invalid_pos(viadev,pos) \
 552         ((pos) < viadev->lastpos && ((pos) >= viadev->bufsize2 ||\
 553                                      viadev->lastpos < viadev->bufsize2))
 554
 555 static inline unsigned int calc_linear_pos(struct via82xx_modem *chip,
 556                                            struct viadev *viadev,
 557                                            unsigned int idx,
 558                                            unsigned int count)
 559 {
 560         unsigned int size, res;
 561
 562         size = viadev->idx_table[idx].size;
 563         res = viadev->idx_table[idx].offset + size - count;
 564
 565         /* check the validity of the calculated position */
 566         if (size < count) {
 567                 dev_err(chip->card->dev,
 568                         "invalid via82xx_cur_ptr (size = %d, count = %d)\n",
 569                            (int)size, (int)count);
 570                 res = viadev->lastpos;
 571         } else if (check_invalid_pos(viadev, res)) {
 572 #ifdef POINTER_DEBUG
 573                 dev_dbg(chip->card->dev,
 574                         "fail: idx = %i/%i, lastpos = 0x%x, bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, count = 0x%x\n",
 575                         idx, viadev->tbl_entries, viadev->lastpos,
 576                        viadev->bufsize2, viadev->idx_table[idx].offset,
 577                        viadev->idx_table[idx].size, count);
 578 #endif
 579                 if (count && size < count) {
 580                         dev_dbg(chip->card->dev,
 581                                 "invalid via82xx_cur_ptr, using last valid pointer\n");
 582                         res = viadev->lastpos;
 583                 } else {
 584                         if (! count)
 585                                 /* bogus count 0 on the DMA boundary? */
 586                                 res = viadev->idx_table[idx].offset;
 587                         else
 588                                 /* count register returns full size
 589                                  * when end of buffer is reached
 590                                  */
 591                                 res = viadev->idx_table[idx].offset + size;
 592                         if (check_invalid_pos(viadev, res)) {
 593                                 dev_dbg(chip->card->dev,
 594                                         "invalid via82xx_cur_ptr (2), using last valid pointer\n");
 595                                 res = viadev->lastpos;
 596                         }
 597                 }
 598         }
 599         viadev->lastpos = res; /* remember the last position */
 600         if (res >= viadev->bufsize)
 601                 res -= viadev->bufsize;
 602         return res;
 603 }
 604
 605 /*
 606  * get the current pointer on via686
 607  */
 608 static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
 609 {
 610         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 611         struct viadev *viadev = substream->runtime->private_data;
 612         unsigned int idx, ptr, count, res;
 613
 614         if (snd_BUG_ON(!viadev->tbl_entries))
 615                 return 0;
 616         if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
 617                 return 0;
 618
 619         spin_lock(&chip->reg_lock);
 620         count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
 621         /* The via686a does not have the current index register,
 622          * so we need to calculate the index from CURR_PTR.
 623          */
 624         ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
 625         if (ptr <= (unsigned int)viadev->table.addr)
 626                 idx = 0;
 627         else /* CURR_PTR holds the address + 8 */
 628                 idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) %
 629                         viadev->tbl_entries;
 630         res = calc_linear_pos(chip, viadev, idx, count);
 631         spin_unlock(&chip->reg_lock);
 632
 633         return bytes_to_frames(substream->runtime, res);
 634 }
 635
 636 /*
 637  * hw_params callback:
 638  * allocate the buffer and build up the buffer description table
 639  */
 640 static int snd_via82xx_hw_params(struct snd_pcm_substream *substream,
 641                                  struct snd_pcm_hw_params *hw_params)
 642 {
 643         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 644         struct viadev *viadev = substream->runtime->private_data;
 645         int err;
 646
 647         err = build_via_table(viadev, substream, chip->pci,
 648                               params_periods(hw_params),
 649                               params_period_bytes(hw_params));
 650         if (err < 0)
 651                 return err;
 652
 653         snd_ac97_write(chip->ac97, AC97_LINE1_RATE, params_rate(hw_params));
 654         snd_ac97_write(chip->ac97, AC97_LINE1_LEVEL, 0);
 655
 656         return 0;
 657 }
 658
 659 /*
 660  * hw_free callback:
 661  * clean up the buffer description table and release the buffer
 662  */
 663 static int snd_via82xx_hw_free(struct snd_pcm_substream *substream)
 664 {
 665         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 666         struct viadev *viadev = substream->runtime->private_data;
 667
 668         clean_via_table(viadev, substream, chip->pci);
 669         return 0;
 670 }
 671
 672
 673 /*
 674  * set up the table pointer
 675  */
 676 static void snd_via82xx_set_table_ptr(struct via82xx_modem *chip, struct viadev *viadev)
 677 {
 678         snd_via82xx_codec_ready(chip, chip->ac97_secondary);
 679         outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
 680         udelay(20);
 681         snd_via82xx_codec_ready(chip, chip->ac97_secondary);
 682 }
 683
 684 /*
 685  * prepare callback for playback and capture
 686  */
 687 static int snd_via82xx_pcm_prepare(struct snd_pcm_substream *substream)
 688 {
 689         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 690         struct viadev *viadev = substream->runtime->private_data;
 691
 692         snd_via82xx_channel_reset(chip, viadev);
 693         /* this must be set after channel_reset */
 694         snd_via82xx_set_table_ptr(chip, viadev);
 695         outb(VIA_REG_TYPE_AUTOSTART|VIA_REG_TYPE_INT_EOL|VIA_REG_TYPE_INT_FLAG,
 696              VIADEV_REG(viadev, OFFSET_TYPE));
 697         return 0;
 698 }
 699
 700 /*
 701  * pcm hardware definition, identical for both playback and capture
 702  */
 703 static const struct snd_pcm_hardware snd_via82xx_hw =
 704 {
 705         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
 706                                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
 707                                  SNDRV_PCM_INFO_MMAP_VALID |
 708                                  /* SNDRV_PCM_INFO_RESUME | */
 709                                  SNDRV_PCM_INFO_PAUSE),
 710         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 711         .rates =                SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_KNOT,
 712         .rate_min =             8000,
 713         .rate_max =             16000,
 714         .channels_min =         1,
 715         .channels_max =         1,
 716         .buffer_bytes_max =     128 * 1024,
 717         .period_bytes_min =     32,
 718         .period_bytes_max =     128 * 1024,
 719         .periods_min =          2,
 720         .periods_max =          VIA_TABLE_SIZE / 2,
 721         .fifo_size =            0,
 722 };
 723
 724
 725 /*
 726  * open callback skeleton
 727  */
 728 static int snd_via82xx_modem_pcm_open(struct via82xx_modem *chip, struct viadev *viadev,
 729                                       struct snd_pcm_substream *substream)
 730 {
 731         struct snd_pcm_runtime *runtime = substream->runtime;
 732         int err;
 733         static const unsigned int rates[] = { 8000,  9600, 12000, 16000 };
 734         static const struct snd_pcm_hw_constraint_list hw_constraints_rates = {
 735                 .count = ARRAY_SIZE(rates),
 736                 .list = rates,
 737                 .mask = 0,
 738         };
 739
 740         runtime->hw = snd_via82xx_hw;
 741
 742         if ((err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 743                                               &hw_constraints_rates)) < 0)
 744                 return err;
 745
 746         /* we may remove following constaint when we modify table entries
 747            in interrupt */
 748         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
 749                 return err;
 750
 751         runtime->private_data = viadev;
 752         viadev->substream = substream;
 753
 754         return 0;
 755 }
 756
 757
 758 /*
 759  * open callback for playback
 760  */
 761 static int snd_via82xx_playback_open(struct snd_pcm_substream *substream)
 762 {
 763         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 764         struct viadev *viadev = &chip->devs[chip->playback_devno + substream->number];
 765
 766         return snd_via82xx_modem_pcm_open(chip, viadev, substream);
 767 }
 768
 769 /*
 770  * open callback for capture
 771  */
 772 static int snd_via82xx_capture_open(struct snd_pcm_substream *substream)
 773 {
 774         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
 775         struct viadev *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];
 776
 777         return snd_via82xx_modem_pcm_open(chip, viadev, substream);
 778 }
 779
 780 /*
 781  * close callback
 782  */
 783 static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream)
 784 {
 785         struct viadev *viadev = substream->runtime->private_data;
 786
 787         viadev->substream = NULL;
 788         return 0;
 789 }
 790
 791
 792 /* via686 playback callbacks */
 793 static const struct snd_pcm_ops snd_via686_playback_ops = {
 794         .open =         snd_via82xx_playback_open,
 795         .close =        snd_via82xx_pcm_close,
 796         .hw_params =    snd_via82xx_hw_params,
 797         .hw_free =      snd_via82xx_hw_free,
 798         .prepare =      snd_via82xx_pcm_prepare,
 799         .trigger =      snd_via82xx_pcm_trigger,
 800         .pointer =      snd_via686_pcm_pointer,
 801 };
 802
 803 /* via686 capture callbacks */
 804 static const struct snd_pcm_ops snd_via686_capture_ops = {
 805         .open =         snd_via82xx_capture_open,
 806         .close =        snd_via82xx_pcm_close,
 807         .hw_params =    snd_via82xx_hw_params,
 808         .hw_free =      snd_via82xx_hw_free,
 809         .prepare =      snd_via82xx_pcm_prepare,
 810         .trigger =      snd_via82xx_pcm_trigger,
 811         .pointer =      snd_via686_pcm_pointer,
 812 };
 813
 814
 815 static void init_viadev(struct via82xx_modem *chip, int idx, unsigned int reg_offset,
 816                         int direction)
 817 {
 818         chip->devs[idx].reg_offset = reg_offset;
 819         chip->devs[idx].direction = direction;
 820         chip->devs[idx].port = chip->port + reg_offset;
 821 }
 822
 823 /*
 824  * create a pcm instance for via686a/b
 825  */
 826 static int snd_via686_pcm_new(struct via82xx_modem *chip)
 827 {
 828         struct snd_pcm *pcm;
 829         int err;
 830
 831         chip->playback_devno = 0;
 832         chip->capture_devno = 1;
 833         chip->num_devs = 2;
 834         chip->intr_mask = 0x330000; /* FLAGS | EOL for MR, MW */
 835
 836         err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
 837         if (err < 0)
 838                 return err;
 839         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via686_playback_ops);
 840         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via686_capture_ops);
 841         pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
 842         pcm->private_data = chip;
 843         strcpy(pcm->name, chip->card->shortname);
 844         chip->pcms[0] = pcm;
 845         init_viadev(chip, 0, VIA_REG_MO_STATUS, 0);
 846         init_viadev(chip, 1, VIA_REG_MI_STATUS, 1);
 847
 848         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
 849                                        &chip->pci->dev, 64*1024, 128*1024);
 850         return 0;
 851 }
 852
 853
 854 /*
 855  *  Mixer part
 856  */
 857
 858
 859 static void snd_via82xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
 860 {
 861         struct via82xx_modem *chip = bus->private_data;
 862         chip->ac97_bus = NULL;
 863 }
 864
 865 static void snd_via82xx_mixer_free_ac97(struct snd_ac97 *ac97)
 866 {
 867         struct via82xx_modem *chip = ac97->private_data;
 868         chip->ac97 = NULL;
 869 }
 870
 871
 872 static int snd_via82xx_mixer_new(struct via82xx_modem *chip)
 873 {
 874         struct snd_ac97_template ac97;
 875         int err;
 876         static const struct snd_ac97_bus_ops ops = {
 877                 .write = snd_via82xx_codec_write,
 878                 .read = snd_via82xx_codec_read,
 879                 .wait = snd_via82xx_codec_wait,
 880         };
 881
 882         if ((err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus)) < 0)
 883                 return err;
 884         chip->ac97_bus->private_free = snd_via82xx_mixer_free_ac97_bus;
 885         chip->ac97_bus->clock = chip->ac97_clock;
 886
 887         memset(&ac97, 0, sizeof(ac97));
 888         ac97.private_data = chip;
 889         ac97.private_free = snd_via82xx_mixer_free_ac97;
 890         ac97.pci = chip->pci;
 891         ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
 892         ac97.num = chip->ac97_secondary;
 893
 894         if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
 895                 return err;
 896
 897         return 0;
 898 }
 899
 900
 901 /*
 902  * proc interface
 903  */
 904 static void snd_via82xx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 905 {
 906         struct via82xx_modem *chip = entry->private_data;
 907         int i;
 908
 909         snd_iprintf(buffer, "%s\n\n", chip->card->longname);
 910         for (i = 0; i < 0xa0; i += 4) {
 911                 snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
 912         }
 913 }
 914
 915 static void snd_via82xx_proc_init(struct via82xx_modem *chip)
 916 {
 917         snd_card_ro_proc_new(chip->card, "via82xx", chip,
 918                              snd_via82xx_proc_read);
 919 }
 920
 921 /*
 922  *
 923  */
 924
 925 static int snd_via82xx_chip_init(struct via82xx_modem *chip)
 926 {
 927         unsigned int val;
 928         unsigned long end_time;
 929         unsigned char pval;
 930
 931         pci_read_config_byte(chip->pci, VIA_MC97_CTRL, &pval);
 932         if((pval & VIA_MC97_CTRL_INIT) != VIA_MC97_CTRL_INIT) {
 933                 pci_write_config_byte(chip->pci, 0x44, pval|VIA_MC97_CTRL_INIT);
 934                 udelay(100);
 935         }
 936
 937         pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
 938         if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
 939                 /* deassert ACLink reset, force SYNC */
 940                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
 941                                       VIA_ACLINK_CTRL_ENABLE |
 942                                       VIA_ACLINK_CTRL_RESET |
 943                                       VIA_ACLINK_CTRL_SYNC);
 944                 udelay(100);
 945 #if 1 /* FIXME: should we do full reset here for all chip models? */
 946                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
 947                 udelay(100);
 948 #else
 949                 /* deassert ACLink reset, force SYNC (warm AC'97 reset) */
 950                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
 951                                       VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
 952                 udelay(2);
 953 #endif
 954                 /* ACLink on, deassert ACLink reset, VSR, SGD data out */
 955                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
 956                 udelay(100);
 957         }
 958
 959         pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
 960         if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
 961                 /* ACLink on, deassert ACLink reset, VSR, SGD data out */
 962                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
 963                 udelay(100);
 964         }
 965
 966         /* wait until codec ready */
 967         end_time = jiffies + msecs_to_jiffies(750);
 968         do {
 969                 pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
 970                 if (pval & VIA_ACLINK_C00_READY) /* primary codec ready */
 971                         break;
 972                 schedule_timeout_uninterruptible(1);
 973         } while (time_before(jiffies, end_time));
 974
 975         if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY)
 976                 dev_err(chip->card->dev,
 977                         "AC'97 codec is not ready [0x%x]\n", val);
 978
 979         snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
 980                                  VIA_REG_AC97_SECONDARY_VALID |
 981                                  (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
 982         end_time = jiffies + msecs_to_jiffies(750);
 983         snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
 984                                  VIA_REG_AC97_SECONDARY_VALID |
 985                                  (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
 986         do {
 987                 if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_SECONDARY_VALID) {
 988                         chip->ac97_secondary = 1;
 989                         goto __ac97_ok2;
 990                 }
 991                 schedule_timeout_uninterruptible(1);
 992         } while (time_before(jiffies, end_time));
 993         /* This is ok, the most of motherboards have only one codec */
 994
 995       __ac97_ok2:
 996
 997         /* route FM trap to IRQ, disable FM trap */
 998         // pci_write_config_byte(chip->pci, VIA_FM_NMI_CTRL, 0);
 999         /* disable all GPI interrupts */
1000         outl(0, VIAREG(chip, GPI_INTR));
1001
1002         return 0;
1003 }
1004
1005 #ifdef CONFIG_PM_SLEEP
1006 /*
1007  * power management
1008  */
1009 static int snd_via82xx_suspend(struct device *dev)
1010 {
1011         struct snd_card *card = dev_get_drvdata(dev);
1012         struct via82xx_modem *chip = card->private_data;
1013         int i;
1014
1015         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1016         for (i = 0; i < chip->num_devs; i++)
1017                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1018         snd_ac97_suspend(chip->ac97);
1019         return 0;
1020 }
1021
1022 static int snd_via82xx_resume(struct device *dev)
1023 {
1024         struct snd_card *card = dev_get_drvdata(dev);
1025         struct via82xx_modem *chip = card->private_data;
1026         int i;
1027
1028         snd_via82xx_chip_init(chip);
1029
1030         snd_ac97_resume(chip->ac97);
1031
1032         for (i = 0; i < chip->num_devs; i++)
1033                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1034
1035         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1036         return 0;
1037 }
1038
1039 static SIMPLE_DEV_PM_OPS(snd_via82xx_pm, snd_via82xx_suspend, snd_via82xx_resume);
1040 #define SND_VIA82XX_PM_OPS      &snd_via82xx_pm
1041 #else
1042 #define SND_VIA82XX_PM_OPS      NULL
1043 #endif /* CONFIG_PM_SLEEP */
1044
1045 static int snd_via82xx_free(struct via82xx_modem *chip)
1046 {
1047         unsigned int i;
1048
1049         if (chip->irq < 0)
1050                 goto __end_hw;
1051         /* disable interrupts */
1052         for (i = 0; i < chip->num_devs; i++)
1053                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1054
1055       __end_hw:
1056         if (chip->irq >= 0)
1057                 free_irq(chip->irq, chip);
1058         pci_release_regions(chip->pci);
1059         pci_disable_device(chip->pci);
1060         kfree(chip);
1061         return 0;
1062 }
1063
1064 static int snd_via82xx_dev_free(struct snd_device *device)
1065 {
1066         struct via82xx_modem *chip = device->device_data;
1067         return snd_via82xx_free(chip);
1068 }
1069
1070 static int snd_via82xx_create(struct snd_card *card,
1071                               struct pci_dev *pci,
1072                               int chip_type,
1073                               int revision,
1074                               unsigned int ac97_clock,
1075                               struct via82xx_modem **r_via)
1076 {
1077         struct via82xx_modem *chip;
1078         int err;
1079         static const struct snd_device_ops ops = {
1080                 .dev_free =     snd_via82xx_dev_free,
1081         };
1082
1083         if ((err = pci_enable_device(pci)) < 0)
1084                 return err;
1085
1086         if ((chip = kzalloc(sizeof(*chip), GFP_KERNEL)) == NULL) {
1087                 pci_disable_device(pci);
1088                 return -ENOMEM;
1089         }
1090
1091         spin_lock_init(&chip->reg_lock);
1092         chip->card = card;
1093         chip->pci = pci;
1094         chip->irq = -1;
1095
1096         if ((err = pci_request_regions(pci, card->driver)) < 0) {
1097                 kfree(chip);
1098                 pci_disable_device(pci);
1099                 return err;
1100         }
1101         chip->port = pci_resource_start(pci, 0);
1102         if (request_irq(pci->irq, snd_via82xx_interrupt, IRQF_SHARED,
1103                         KBUILD_MODNAME, chip)) {
1104                 dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
1105                 snd_via82xx_free(chip);
1106                 return -EBUSY;
1107         }
1108         chip->irq = pci->irq;
1109         card->sync_irq = chip->irq;
1110         if (ac97_clock >= 8000 && ac97_clock <= 48000)
1111                 chip->ac97_clock = ac97_clock;
1112
1113         if ((err = snd_via82xx_chip_init(chip)) < 0) {
1114                 snd_via82xx_free(chip);
1115                 return err;
1116         }
1117
1118         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
1119                 snd_via82xx_free(chip);
1120                 return err;
1121         }
1122
1123         /* The 8233 ac97 controller does not implement the master bit
1124          * in the pci command register. IMHO this is a violation of the PCI spec.
1125          * We call pci_set_master here because it does not hurt. */
1126         pci_set_master(pci);
1127
1128         *r_via = chip;
1129         return 0;
1130 }
1131
1132
1133 static int snd_via82xx_probe(struct pci_dev *pci,
1134                              const struct pci_device_id *pci_id)
1135 {
1136         struct snd_card *card;
1137         struct via82xx_modem *chip;
1138         int chip_type = 0, card_type;
1139         unsigned int i;
1140         int err;
1141
1142         err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
1143         if (err < 0)
1144                 return err;
1145
1146         card_type = pci_id->driver_data;
1147         switch (card_type) {
1148         case TYPE_CARD_VIA82XX_MODEM:
1149                 strcpy(card->driver, "VIA82XX-MODEM");
1150                 sprintf(card->shortname, "VIA 82XX modem");
1151                 break;
1152         default:
1153                 dev_err(card->dev, "invalid card type %d\n", card_type);
1154                 err = -EINVAL;
1155                 goto __error;
1156         }
1157
1158         if ((err = snd_via82xx_create(card, pci, chip_type, pci->revision,
1159                                       ac97_clock, &chip)) < 0)
1160                 goto __error;
1161         card->private_data = chip;
1162         if ((err = snd_via82xx_mixer_new(chip)) < 0)
1163                 goto __error;
1164
1165         if ((err = snd_via686_pcm_new(chip)) < 0 )
1166                 goto __error;
1167
1168         /* disable interrupts */
1169         for (i = 0; i < chip->num_devs; i++)
1170                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1171
1172         sprintf(card->longname, "%s at 0x%lx, irq %d",
1173                 card->shortname, chip->port, chip->irq);
1174
1175         snd_via82xx_proc_init(chip);
1176
1177         if ((err = snd_card_register(card)) < 0) {
1178                 snd_card_free(card);
1179                 return err;
1180         }
1181         pci_set_drvdata(pci, card);
1182         return 0;
1183
1184  __error:
1185         snd_card_free(card);
1186         return err;
1187 }
1188
1189 static void snd_via82xx_remove(struct pci_dev *pci)
1190 {
1191         snd_card_free(pci_get_drvdata(pci));
1192 }
1193
1194 static struct pci_driver via82xx_modem_driver = {
1195         .name = KBUILD_MODNAME,
1196         .id_table = snd_via82xx_modem_ids,
1197         .probe = snd_via82xx_probe,
1198         .remove = snd_via82xx_remove,
1199         .driver = {
1200                 .pm = SND_VIA82XX_PM_OPS,
1201         },
1202 };
1203
1204 module_pci_driver(via82xx_modem_driver);