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via82xx_modem.c
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1 /*
2  * ALSA modem driver for VIA VT82xx (South Bridge)
3  *
4  * VT82C686A/B/C, VT8233A/C, VT8235
5  *
6  * Copyright (c) 2000 Jaroslav Kysela <[email protected]>
7  * Tjeerd.Mulder <[email protected]>
8  * 2002 Takashi Iwai <[email protected]>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23  *
24  */
25 
26 /*
27  * Changes:
28  *
29  * Sep. 2, 2004 Sasha Khapyorsky <[email protected]>
30  * Modified from original audio driver 'via82xx.c' to support AC97
31  * modems.
32  */
33 
34 #include <asm/io.h>
35 #include <linux/delay.h>
36 #include <linux/interrupt.h>
37 #include <linux/init.h>
38 #include <linux/pci.h>
39 #include <linux/slab.h>
40 #include <linux/module.h>
41 #include <sound/core.h>
42 #include <sound/pcm.h>
43 #include <sound/pcm_params.h>
44 #include <sound/info.h>
45 #include <sound/ac97_codec.h>
46 #include <sound/initval.h>
47 
48 #if 0
49 #define POINTER_DEBUG
50 #endif
51 
52 MODULE_AUTHOR("Jaroslav Kysela <[email protected]>");
53 MODULE_DESCRIPTION("VIA VT82xx modem");
54 MODULE_LICENSE("GPL");
55 MODULE_SUPPORTED_DEVICE("{{VIA,VT82C686A/B/C modem,pci}}");
56 
57 static int index = -2; /* Exclude the first card */
58 static char *id = SNDRV_DEFAULT_STR1; /* ID for this card */
59 static int ac97_clock = 48000;
60 
61 module_param(index, int, 0444);
62 MODULE_PARM_DESC(index, "Index value for VIA 82xx bridge.");
63 module_param(id, charp, 0444);
64 MODULE_PARM_DESC(id, "ID string for VIA 82xx bridge.");
65 module_param(ac97_clock, int, 0444);
66 MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
67 
68 /* just for backward compatibility */
69 static bool enable;
70 module_param(enable, bool, 0444);
71 
72 
73 /*
74  * Direct registers
75  */
76 
77 #define VIAREG(via, x) ((via)->port + VIA_REG_##x)
78 #define VIADEV_REG(viadev, x) ((viadev)->port + VIA_REG_##x)
79 
80 /* common offsets */
81 #define VIA_REG_OFFSET_STATUS 0x00 /* byte - channel status */
82 #define VIA_REG_STAT_ACTIVE 0x80 /* RO */
83 #define VIA_REG_STAT_PAUSED 0x40 /* RO */
84 #define VIA_REG_STAT_TRIGGER_QUEUED 0x08 /* RO */
85 #define VIA_REG_STAT_STOPPED 0x04 /* RWC */
86 #define VIA_REG_STAT_EOL 0x02 /* RWC */
87 #define VIA_REG_STAT_FLAG 0x01 /* RWC */
88 #define VIA_REG_OFFSET_CONTROL 0x01 /* byte - channel control */
89 #define VIA_REG_CTRL_START 0x80 /* WO */
90 #define VIA_REG_CTRL_TERMINATE 0x40 /* WO */
91 #define VIA_REG_CTRL_AUTOSTART 0x20
92 #define VIA_REG_CTRL_PAUSE 0x08 /* RW */
93 #define VIA_REG_CTRL_INT_STOP 0x04
94 #define VIA_REG_CTRL_INT_EOL 0x02
95 #define VIA_REG_CTRL_INT_FLAG 0x01
96 #define VIA_REG_CTRL_RESET 0x01 /* RW - probably reset? undocumented */
97 #define VIA_REG_CTRL_INT (VIA_REG_CTRL_INT_FLAG | VIA_REG_CTRL_INT_EOL | VIA_REG_CTRL_AUTOSTART)
98 #define VIA_REG_OFFSET_TYPE 0x02 /* byte - channel type (686 only) */
99 #define VIA_REG_TYPE_AUTOSTART 0x80 /* RW - autostart at EOL */
100 #define VIA_REG_TYPE_16BIT 0x20 /* RW */
101 #define VIA_REG_TYPE_STEREO 0x10 /* RW */
102 #define VIA_REG_TYPE_INT_LLINE 0x00
103 #define VIA_REG_TYPE_INT_LSAMPLE 0x04
104 #define VIA_REG_TYPE_INT_LESSONE 0x08
105 #define VIA_REG_TYPE_INT_MASK 0x0c
106 #define VIA_REG_TYPE_INT_EOL 0x02
107 #define VIA_REG_TYPE_INT_FLAG 0x01
108 #define VIA_REG_OFFSET_TABLE_PTR 0x04 /* dword - channel table pointer */
109 #define VIA_REG_OFFSET_CURR_PTR 0x04 /* dword - channel current pointer */
110 #define VIA_REG_OFFSET_STOP_IDX 0x08 /* dword - stop index, channel type, sample rate */
111 #define VIA_REG_OFFSET_CURR_COUNT 0x0c /* dword - channel current count (24 bit) */
112 #define VIA_REG_OFFSET_CURR_INDEX 0x0f /* byte - channel current index (for via8233 only) */
113 
114 #define DEFINE_VIA_REGSET(name,val) \
115 enum {\
116  VIA_REG_##name##_STATUS = (val),\
117  VIA_REG_##name##_CONTROL = (val) + 0x01,\
118  VIA_REG_##name##_TYPE = (val) + 0x02,\
119  VIA_REG_##name##_TABLE_PTR = (val) + 0x04,\
120  VIA_REG_##name##_CURR_PTR = (val) + 0x04,\
121  VIA_REG_##name##_STOP_IDX = (val) + 0x08,\
122  VIA_REG_##name##_CURR_COUNT = (val) + 0x0c,\
123 }
124 
125 /* modem block */
126 DEFINE_VIA_REGSET(MO, 0x40);
127 DEFINE_VIA_REGSET(MI, 0x50);
128 
129 /* AC'97 */
130 #define VIA_REG_AC97 0x80 /* dword */
131 #define VIA_REG_AC97_CODEC_ID_MASK (3<<30)
132 #define VIA_REG_AC97_CODEC_ID_SHIFT 30
133 #define VIA_REG_AC97_CODEC_ID_PRIMARY 0x00
134 #define VIA_REG_AC97_CODEC_ID_SECONDARY 0x01
135 #define VIA_REG_AC97_SECONDARY_VALID (1<<27)
136 #define VIA_REG_AC97_PRIMARY_VALID (1<<25)
137 #define VIA_REG_AC97_BUSY (1<<24)
138 #define VIA_REG_AC97_READ (1<<23)
139 #define VIA_REG_AC97_CMD_SHIFT 16
140 #define VIA_REG_AC97_CMD_MASK 0x7e
141 #define VIA_REG_AC97_DATA_SHIFT 0
142 #define VIA_REG_AC97_DATA_MASK 0xffff
143 
144 #define VIA_REG_SGD_SHADOW 0x84 /* dword */
145 #define VIA_REG_SGD_STAT_PB_FLAG (1<<0)
146 #define VIA_REG_SGD_STAT_CP_FLAG (1<<1)
147 #define VIA_REG_SGD_STAT_FM_FLAG (1<<2)
148 #define VIA_REG_SGD_STAT_PB_EOL (1<<4)
149 #define VIA_REG_SGD_STAT_CP_EOL (1<<5)
150 #define VIA_REG_SGD_STAT_FM_EOL (1<<6)
151 #define VIA_REG_SGD_STAT_PB_STOP (1<<8)
152 #define VIA_REG_SGD_STAT_CP_STOP (1<<9)
153 #define VIA_REG_SGD_STAT_FM_STOP (1<<10)
154 #define VIA_REG_SGD_STAT_PB_ACTIVE (1<<12)
155 #define VIA_REG_SGD_STAT_CP_ACTIVE (1<<13)
156 #define VIA_REG_SGD_STAT_FM_ACTIVE (1<<14)
157 #define VIA_REG_SGD_STAT_MR_FLAG (1<<16)
158 #define VIA_REG_SGD_STAT_MW_FLAG (1<<17)
159 #define VIA_REG_SGD_STAT_MR_EOL (1<<20)
160 #define VIA_REG_SGD_STAT_MW_EOL (1<<21)
161 #define VIA_REG_SGD_STAT_MR_STOP (1<<24)
162 #define VIA_REG_SGD_STAT_MW_STOP (1<<25)
163 #define VIA_REG_SGD_STAT_MR_ACTIVE (1<<28)
164 #define VIA_REG_SGD_STAT_MW_ACTIVE (1<<29)
165 
166 #define VIA_REG_GPI_STATUS 0x88
167 #define VIA_REG_GPI_INTR 0x8c
168 
169 #define VIA_TBL_BIT_FLAG 0x40000000
170 #define VIA_TBL_BIT_EOL 0x80000000
171 
172 /* pci space */
173 #define VIA_ACLINK_STAT 0x40
174 #define VIA_ACLINK_C11_READY 0x20
175 #define VIA_ACLINK_C10_READY 0x10
176 #define VIA_ACLINK_C01_READY 0x04 /* secondary codec ready */
177 #define VIA_ACLINK_LOWPOWER 0x02 /* low-power state */
178 #define VIA_ACLINK_C00_READY 0x01 /* primary codec ready */
179 #define VIA_ACLINK_CTRL 0x41
180 #define VIA_ACLINK_CTRL_ENABLE 0x80 /* 0: disable, 1: enable */
181 #define VIA_ACLINK_CTRL_RESET 0x40 /* 0: assert, 1: de-assert */
182 #define VIA_ACLINK_CTRL_SYNC 0x20 /* 0: release SYNC, 1: force SYNC hi */
183 #define VIA_ACLINK_CTRL_SDO 0x10 /* 0: release SDO, 1: force SDO hi */
184 #define VIA_ACLINK_CTRL_VRA 0x08 /* 0: disable VRA, 1: enable VRA */
185 #define VIA_ACLINK_CTRL_PCM 0x04 /* 0: disable PCM, 1: enable PCM */
186 #define VIA_ACLINK_CTRL_FM 0x02 /* via686 only */
187 #define VIA_ACLINK_CTRL_SB 0x01 /* via686 only */
188 #define VIA_ACLINK_CTRL_INIT (VIA_ACLINK_CTRL_ENABLE|\
189  VIA_ACLINK_CTRL_RESET|\
190  VIA_ACLINK_CTRL_PCM)
191 #define VIA_FUNC_ENABLE 0x42
192 #define VIA_FUNC_MIDI_PNP 0x80 /* FIXME: it's 0x40 in the datasheet! */
193 #define VIA_FUNC_MIDI_IRQMASK 0x40 /* FIXME: not documented! */
194 #define VIA_FUNC_RX2C_WRITE 0x20
195 #define VIA_FUNC_SB_FIFO_EMPTY 0x10
196 #define VIA_FUNC_ENABLE_GAME 0x08
197 #define VIA_FUNC_ENABLE_FM 0x04
198 #define VIA_FUNC_ENABLE_MIDI 0x02
199 #define VIA_FUNC_ENABLE_SB 0x01
200 #define VIA_PNP_CONTROL 0x43
201 #define VIA_MC97_CTRL 0x44
202 #define VIA_MC97_CTRL_ENABLE 0x80
203 #define VIA_MC97_CTRL_SECONDARY 0x40
204 #define VIA_MC97_CTRL_INIT (VIA_MC97_CTRL_ENABLE|\
205  VIA_MC97_CTRL_SECONDARY)
206 
207 
208 /*
209  * pcm stream
210  */
211 
212 struct snd_via_sg_table {
213  unsigned int offset;
214  unsigned int size;
215 } ;
216 
217 #define VIA_TABLE_SIZE 255
218 
219 struct viadev {
220  unsigned int reg_offset;
221  unsigned long port;
222  int direction; /* playback = 0, capture = 1 */
223  struct snd_pcm_substream *substream;
224  int running;
225  unsigned int tbl_entries; /* # descriptors */
226  struct snd_dma_buffer table;
227  struct snd_via_sg_table *idx_table;
228  /* for recovery from the unexpected pointer */
229  unsigned int lastpos;
230  unsigned int bufsize;
231  unsigned int bufsize2;
232 };
233 
234 enum { TYPE_CARD_VIA82XX_MODEM = 1 };
235 
236 #define VIA_MAX_MODEM_DEVS 2
237 
238 struct via82xx_modem {
239  int irq;
240 
241  unsigned long port;
242 
243  unsigned int intr_mask; /* SGD_SHADOW mask to check interrupts */
244 
245  struct pci_dev *pci;
246  struct snd_card *card;
247 
248  unsigned int num_devs;
249  unsigned int playback_devno, capture_devno;
250  struct viadev devs[VIA_MAX_MODEM_DEVS];
251 
252  struct snd_pcm *pcms[2];
253 
254  struct snd_ac97_bus *ac97_bus;
255  struct snd_ac97 *ac97;
256  unsigned int ac97_clock;
257  unsigned int ac97_secondary; /* secondary AC'97 codec is present */
258 
259  spinlock_t reg_lock;
260  struct snd_info_entry *proc_entry;
261 };
262 
263 static DEFINE_PCI_DEVICE_TABLE(snd_via82xx_modem_ids) = {
264  { PCI_VDEVICE(VIA, 0x3068), TYPE_CARD_VIA82XX_MODEM, },
265  { 0, }
266 };
267 
268 MODULE_DEVICE_TABLE(pci, snd_via82xx_modem_ids);
269 
270 /*
271  */
272 
273 /*
274  * allocate and initialize the descriptor buffers
275  * periods = number of periods
276  * fragsize = period size in bytes
277  */
278 static int build_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
279  struct pci_dev *pci,
280  unsigned int periods, unsigned int fragsize)
281 {
282  unsigned int i, idx, ofs, rest;
283  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
284 
285  if (dev->table.area == NULL) {
286  /* the start of each lists must be aligned to 8 bytes,
287  * but the kernel pages are much bigger, so we don't care
288  */
289  if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
290  PAGE_ALIGN(VIA_TABLE_SIZE * 2 * 8),
291  &dev->table) < 0)
292  return -ENOMEM;
293  }
294  if (! dev->idx_table) {
295  dev->idx_table = kmalloc(sizeof(*dev->idx_table) * VIA_TABLE_SIZE, GFP_KERNEL);
296  if (! dev->idx_table)
297  return -ENOMEM;
298  }
299 
300  /* fill the entries */
301  idx = 0;
302  ofs = 0;
303  for (i = 0; i < periods; i++) {
304  rest = fragsize;
305  /* fill descriptors for a period.
306  * a period can be split to several descriptors if it's
307  * over page boundary.
308  */
309  do {
310  unsigned int r;
311  unsigned int flag;
312  unsigned int addr;
313 
314  if (idx >= VIA_TABLE_SIZE) {
315  snd_printk(KERN_ERR "via82xx: too much table size!\n");
316  return -EINVAL;
317  }
318  addr = snd_pcm_sgbuf_get_addr(substream, ofs);
319  ((u32 *)dev->table.area)[idx << 1] = cpu_to_le32(addr);
320  r = PAGE_SIZE - (ofs % PAGE_SIZE);
321  if (rest < r)
322  r = rest;
323  rest -= r;
324  if (! rest) {
325  if (i == periods - 1)
326  flag = VIA_TBL_BIT_EOL; /* buffer boundary */
327  else
328  flag = VIA_TBL_BIT_FLAG; /* period boundary */
329  } else
330  flag = 0; /* period continues to the next */
331  /*
332  printk(KERN_DEBUG "via: tbl %d: at %d size %d "
333  "(rest %d)\n", idx, ofs, r, rest);
334  */
335  ((u32 *)dev->table.area)[(idx<<1) + 1] = cpu_to_le32(r | flag);
336  dev->idx_table[idx].offset = ofs;
337  dev->idx_table[idx].size = r;
338  ofs += r;
339  idx++;
340  } while (rest > 0);
341  }
342  dev->tbl_entries = idx;
343  dev->bufsize = periods * fragsize;
344  dev->bufsize2 = dev->bufsize / 2;
345  return 0;
346 }
347 
348 
349 static int clean_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
350  struct pci_dev *pci)
351 {
352  if (dev->table.area) {
353  snd_dma_free_pages(&dev->table);
354  dev->table.area = NULL;
355  }
356  kfree(dev->idx_table);
357  dev->idx_table = NULL;
358  return 0;
359 }
360 
361 /*
362  * Basic I/O
363  */
364 
365 static inline unsigned int snd_via82xx_codec_xread(struct via82xx_modem *chip)
366 {
367  return inl(VIAREG(chip, AC97));
368 }
369 
370 static inline void snd_via82xx_codec_xwrite(struct via82xx_modem *chip, unsigned int val)
371 {
372  outl(val, VIAREG(chip, AC97));
373 }
374 
375 static int snd_via82xx_codec_ready(struct via82xx_modem *chip, int secondary)
376 {
377  unsigned int timeout = 1000; /* 1ms */
378  unsigned int val;
379 
380  while (timeout-- > 0) {
381  udelay(1);
382  if (!((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY))
383  return val & 0xffff;
384  }
385  snd_printk(KERN_ERR "codec_ready: codec %i is not ready [0x%x]\n",
386  secondary, snd_via82xx_codec_xread(chip));
387  return -EIO;
388 }
389 
390 static int snd_via82xx_codec_valid(struct via82xx_modem *chip, int secondary)
391 {
392  unsigned int timeout = 1000; /* 1ms */
393  unsigned int val, val1;
394  unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
395  VIA_REG_AC97_SECONDARY_VALID;
396 
397  while (timeout-- > 0) {
398  val = snd_via82xx_codec_xread(chip);
399  val1 = val & (VIA_REG_AC97_BUSY | stat);
400  if (val1 == stat)
401  return val & 0xffff;
402  udelay(1);
403  }
404  return -EIO;
405 }
406 
407 static void snd_via82xx_codec_wait(struct snd_ac97 *ac97)
408 {
409  struct via82xx_modem *chip = ac97->private_data;
410  int err;
411  err = snd_via82xx_codec_ready(chip, ac97->num);
412  /* here we need to wait fairly for long time.. */
413  msleep(500);
414 }
415 
416 static void snd_via82xx_codec_write(struct snd_ac97 *ac97,
417  unsigned short reg,
418  unsigned short val)
419 {
420  struct via82xx_modem *chip = ac97->private_data;
421  unsigned int xval;
422  if(reg == AC97_GPIO_STATUS) {
423  outl(val, VIAREG(chip, GPI_STATUS));
424  return;
425  }
426  xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
427  xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
428  xval |= reg << VIA_REG_AC97_CMD_SHIFT;
429  xval |= val << VIA_REG_AC97_DATA_SHIFT;
430  snd_via82xx_codec_xwrite(chip, xval);
431  snd_via82xx_codec_ready(chip, ac97->num);
432 }
433 
434 static unsigned short snd_via82xx_codec_read(struct snd_ac97 *ac97, unsigned short reg)
435 {
436  struct via82xx_modem *chip = ac97->private_data;
437  unsigned int xval, val = 0xffff;
438  int again = 0;
439 
440  xval = ac97->num << VIA_REG_AC97_CODEC_ID_SHIFT;
441  xval |= ac97->num ? VIA_REG_AC97_SECONDARY_VALID : VIA_REG_AC97_PRIMARY_VALID;
442  xval |= VIA_REG_AC97_READ;
443  xval |= (reg & 0x7f) << VIA_REG_AC97_CMD_SHIFT;
444  while (1) {
445  if (again++ > 3) {
446  snd_printk(KERN_ERR "codec_read: codec %i is not valid [0x%x]\n",
447  ac97->num, snd_via82xx_codec_xread(chip));
448  return 0xffff;
449  }
450  snd_via82xx_codec_xwrite(chip, xval);
451  udelay (20);
452  if (snd_via82xx_codec_valid(chip, ac97->num) >= 0) {
453  udelay(25);
454  val = snd_via82xx_codec_xread(chip);
455  break;
456  }
457  }
458  return val & 0xffff;
459 }
460 
461 static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
462 {
463  outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
464  VIADEV_REG(viadev, OFFSET_CONTROL));
465  inb(VIADEV_REG(viadev, OFFSET_CONTROL));
466  udelay(50);
467  /* disable interrupts */
468  outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
469  /* clear interrupts */
470  outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
471  outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
472  // outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
473  viadev->lastpos = 0;
474 }
475 
476 
477 /*
478  * Interrupt handler
479  */
480 
481 static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id)
482 {
483  struct via82xx_modem *chip = dev_id;
484  unsigned int status;
485  unsigned int i;
486 
487  status = inl(VIAREG(chip, SGD_SHADOW));
488  if (! (status & chip->intr_mask)) {
489  return IRQ_NONE;
490  }
491 // _skip_sgd:
492 
493  /* check status for each stream */
494  spin_lock(&chip->reg_lock);
495  for (i = 0; i < chip->num_devs; i++) {
496  struct viadev *viadev = &chip->devs[i];
497  unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
498  c_status &= (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED);
499  if (! c_status)
500  continue;
501  if (viadev->substream && viadev->running) {
502  spin_unlock(&chip->reg_lock);
503  snd_pcm_period_elapsed(viadev->substream);
504  spin_lock(&chip->reg_lock);
505  }
506  outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
507  }
508  spin_unlock(&chip->reg_lock);
509  return IRQ_HANDLED;
510 }
511 
512 /*
513  * PCM callbacks
514  */
515 
516 /*
517  * trigger callback
518  */
519 static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
520 {
521  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
522  struct viadev *viadev = substream->runtime->private_data;
523  unsigned char val = 0;
524 
525  switch (cmd) {
526  case SNDRV_PCM_TRIGGER_START:
527  case SNDRV_PCM_TRIGGER_SUSPEND:
528  val |= VIA_REG_CTRL_START;
529  viadev->running = 1;
530  break;
531  case SNDRV_PCM_TRIGGER_STOP:
532  val = VIA_REG_CTRL_TERMINATE;
533  viadev->running = 0;
534  break;
535  case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
536  val |= VIA_REG_CTRL_PAUSE;
537  viadev->running = 0;
538  break;
539  case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
540  viadev->running = 1;
541  break;
542  default:
543  return -EINVAL;
544  }
545  outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
546  if (cmd == SNDRV_PCM_TRIGGER_STOP)
547  snd_via82xx_channel_reset(chip, viadev);
548  return 0;
549 }
550 
551 /*
552  * pointer callbacks
553  */
554 
555 /*
556  * calculate the linear position at the given sg-buffer index and the rest count
557  */
558 
559 #define check_invalid_pos(viadev,pos) \
560  ((pos) < viadev->lastpos && ((pos) >= viadev->bufsize2 ||\
561  viadev->lastpos < viadev->bufsize2))
562 
563 static inline unsigned int calc_linear_pos(struct viadev *viadev, unsigned int idx,
564  unsigned int count)
565 {
566  unsigned int size, res;
567 
568  size = viadev->idx_table[idx].size;
569  res = viadev->idx_table[idx].offset + size - count;
570 
571  /* check the validity of the calculated position */
572  if (size < count) {
573  snd_printd(KERN_ERR "invalid via82xx_cur_ptr (size = %d, count = %d)\n",
574  (int)size, (int)count);
575  res = viadev->lastpos;
576  } else if (check_invalid_pos(viadev, res)) {
577 #ifdef POINTER_DEBUG
578  printk(KERN_DEBUG "fail: idx = %i/%i, lastpos = 0x%x, "
579  "bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, "
580  "count = 0x%x\n", idx, viadev->tbl_entries, viadev->lastpos,
581  viadev->bufsize2, viadev->idx_table[idx].offset,
582  viadev->idx_table[idx].size, count);
583 #endif
584  if (count && size < count) {
585  snd_printd(KERN_ERR "invalid via82xx_cur_ptr, "
586  "using last valid pointer\n");
587  res = viadev->lastpos;
588  } else {
589  if (! count)
590  /* bogus count 0 on the DMA boundary? */
591  res = viadev->idx_table[idx].offset;
592  else
593  /* count register returns full size
594  * when end of buffer is reached
595  */
596  res = viadev->idx_table[idx].offset + size;
597  if (check_invalid_pos(viadev, res)) {
598  snd_printd(KERN_ERR "invalid via82xx_cur_ptr (2), "
599  "using last valid pointer\n");
600  res = viadev->lastpos;
601  }
602  }
603  }
604  viadev->lastpos = res; /* remember the last position */
605  if (res >= viadev->bufsize)
606  res -= viadev->bufsize;
607  return res;
608 }
609 
610 /*
611  * get the current pointer on via686
612  */
613 static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
614 {
615  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
616  struct viadev *viadev = substream->runtime->private_data;
617  unsigned int idx, ptr, count, res;
618 
619  if (snd_BUG_ON(!viadev->tbl_entries))
620  return 0;
621  if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
622  return 0;
623 
624  spin_lock(&chip->reg_lock);
625  count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
626  /* The via686a does not have the current index register,
627  * so we need to calculate the index from CURR_PTR.
628  */
629  ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
630  if (ptr <= (unsigned int)viadev->table.addr)
631  idx = 0;
632  else /* CURR_PTR holds the address + 8 */
633  idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) %
634  viadev->tbl_entries;
635  res = calc_linear_pos(viadev, idx, count);
636  spin_unlock(&chip->reg_lock);
637 
638  return bytes_to_frames(substream->runtime, res);
639 }
640 
641 /*
642  * hw_params callback:
643  * allocate the buffer and build up the buffer description table
644  */
645 static int snd_via82xx_hw_params(struct snd_pcm_substream *substream,
646  struct snd_pcm_hw_params *hw_params)
647 {
648  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
649  struct viadev *viadev = substream->runtime->private_data;
650  int err;
651 
652  err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
653  if (err < 0)
654  return err;
655  err = build_via_table(viadev, substream, chip->pci,
656  params_periods(hw_params),
657  params_period_bytes(hw_params));
658  if (err < 0)
659  return err;
660 
661  snd_ac97_write(chip->ac97, AC97_LINE1_RATE, params_rate(hw_params));
662  snd_ac97_write(chip->ac97, AC97_LINE1_LEVEL, 0);
663 
664  return 0;
665 }
666 
667 /*
668  * hw_free callback:
669  * clean up the buffer description table and release the buffer
670  */
671 static int snd_via82xx_hw_free(struct snd_pcm_substream *substream)
672 {
673  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
674  struct viadev *viadev = substream->runtime->private_data;
675 
676  clean_via_table(viadev, substream, chip->pci);
677  snd_pcm_lib_free_pages(substream);
678  return 0;
679 }
680 
681 
682 /*
683  * set up the table pointer
684  */
685 static void snd_via82xx_set_table_ptr(struct via82xx_modem *chip, struct viadev *viadev)
686 {
687  snd_via82xx_codec_ready(chip, chip->ac97_secondary);
688  outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
689  udelay(20);
690  snd_via82xx_codec_ready(chip, chip->ac97_secondary);
691 }
692 
693 /*
694  * prepare callback for playback and capture
695  */
696 static int snd_via82xx_pcm_prepare(struct snd_pcm_substream *substream)
697 {
698  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
699  struct viadev *viadev = substream->runtime->private_data;
700 
701  snd_via82xx_channel_reset(chip, viadev);
702  /* this must be set after channel_reset */
703  snd_via82xx_set_table_ptr(chip, viadev);
704  outb(VIA_REG_TYPE_AUTOSTART|VIA_REG_TYPE_INT_EOL|VIA_REG_TYPE_INT_FLAG,
705  VIADEV_REG(viadev, OFFSET_TYPE));
706  return 0;
707 }
708 
709 /*
710  * pcm hardware definition, identical for both playback and capture
711  */
712 static struct snd_pcm_hardware snd_via82xx_hw =
713 {
714  .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
715  SNDRV_PCM_INFO_BLOCK_TRANSFER |
716  SNDRV_PCM_INFO_MMAP_VALID |
717  /* SNDRV_PCM_INFO_RESUME | */
718  SNDRV_PCM_INFO_PAUSE),
719  .formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
720  .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_KNOT,
721  .rate_min = 8000,
722  .rate_max = 16000,
723  .channels_min = 1,
724  .channels_max = 1,
725  .buffer_bytes_max = 128 * 1024,
726  .period_bytes_min = 32,
727  .period_bytes_max = 128 * 1024,
728  .periods_min = 2,
729  .periods_max = VIA_TABLE_SIZE / 2,
730  .fifo_size = 0,
731 };
732 
733 
734 /*
735  * open callback skeleton
736  */
737 static int snd_via82xx_modem_pcm_open(struct via82xx_modem *chip, struct viadev *viadev,
738  struct snd_pcm_substream *substream)
739 {
740  struct snd_pcm_runtime *runtime = substream->runtime;
741  int err;
742  static unsigned int rates[] = { 8000, 9600, 12000, 16000 };
743  static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
744  .count = ARRAY_SIZE(rates),
745  .list = rates,
746  .mask = 0,
747  };
748 
749  runtime->hw = snd_via82xx_hw;
750 
751  if ((err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
752  &hw_constraints_rates)) < 0)
753  return err;
754 
755  /* we may remove following constaint when we modify table entries
756  in interrupt */
757  if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
758  return err;
759 
760  runtime->private_data = viadev;
761  viadev->substream = substream;
762 
763  return 0;
764 }
765 
766 
767 /*
768  * open callback for playback
769  */
770 static int snd_via82xx_playback_open(struct snd_pcm_substream *substream)
771 {
772  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
773  struct viadev *viadev = &chip->devs[chip->playback_devno + substream->number];
774 
775  return snd_via82xx_modem_pcm_open(chip, viadev, substream);
776 }
777 
778 /*
779  * open callback for capture
780  */
781 static int snd_via82xx_capture_open(struct snd_pcm_substream *substream)
782 {
783  struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
784  struct viadev *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];
785 
786  return snd_via82xx_modem_pcm_open(chip, viadev, substream);
787 }
788 
789 /*
790  * close callback
791  */
792 static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream)
793 {
794  struct viadev *viadev = substream->runtime->private_data;
795 
796  viadev->substream = NULL;
797  return 0;
798 }
799 
800 
801 /* via686 playback callbacks */
802 static struct snd_pcm_ops snd_via686_playback_ops = {
803  .open = snd_via82xx_playback_open,
804  .close = snd_via82xx_pcm_close,
805  .ioctl = snd_pcm_lib_ioctl,
806  .hw_params = snd_via82xx_hw_params,
807  .hw_free = snd_via82xx_hw_free,
808  .prepare = snd_via82xx_pcm_prepare,
809  .trigger = snd_via82xx_pcm_trigger,
810  .pointer = snd_via686_pcm_pointer,
811  .page = snd_pcm_sgbuf_ops_page,
812 };
813 
814 /* via686 capture callbacks */
815 static struct snd_pcm_ops snd_via686_capture_ops = {
816  .open = snd_via82xx_capture_open,
817  .close = snd_via82xx_pcm_close,
818  .ioctl = snd_pcm_lib_ioctl,
819  .hw_params = snd_via82xx_hw_params,
820  .hw_free = snd_via82xx_hw_free,
821  .prepare = snd_via82xx_pcm_prepare,
822  .trigger = snd_via82xx_pcm_trigger,
823  .pointer = snd_via686_pcm_pointer,
824  .page = snd_pcm_sgbuf_ops_page,
825 };
826 
827 
828 static void init_viadev(struct via82xx_modem *chip, int idx, unsigned int reg_offset,
829  int direction)
830 {
831  chip->devs[idx].reg_offset = reg_offset;
832  chip->devs[idx].direction = direction;
833  chip->devs[idx].port = chip->port + reg_offset;
834 }
835 
836 /*
837  * create a pcm instance for via686a/b
838  */
839 static int __devinit snd_via686_pcm_new(struct via82xx_modem *chip)
840 {
841  struct snd_pcm *pcm;
842  int err;
843 
844  chip->playback_devno = 0;
845  chip->capture_devno = 1;
846  chip->num_devs = 2;
847  chip->intr_mask = 0x330000; /* FLAGS | EOL for MR, MW */
848 
849  err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
850  if (err < 0)
851  return err;
852  snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via686_playback_ops);
853  snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via686_capture_ops);
854  pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
855  pcm->private_data = chip;
856  strcpy(pcm->name, chip->card->shortname);
857  chip->pcms[0] = pcm;
858  init_viadev(chip, 0, VIA_REG_MO_STATUS, 0);
859  init_viadev(chip, 1, VIA_REG_MI_STATUS, 1);
860 
861  if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
862  snd_dma_pci_data(chip->pci),
863  64*1024, 128*1024)) < 0)
864  return err;
865 
866  return 0;
867 }
868 
869 
870 /*
871  * Mixer part
872  */
873 
874 
875 static void snd_via82xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
876 {
877  struct via82xx_modem *chip = bus->private_data;
878  chip->ac97_bus = NULL;
879 }
880 
881 static void snd_via82xx_mixer_free_ac97(struct snd_ac97 *ac97)
882 {
883  struct via82xx_modem *chip = ac97->private_data;
884  chip->ac97 = NULL;
885 }
886 
887 
888 static int __devinit snd_via82xx_mixer_new(struct via82xx_modem *chip)
889 {
890  struct snd_ac97_template ac97;
891  int err;
892  static struct snd_ac97_bus_ops ops = {
893  .write = snd_via82xx_codec_write,
894  .read = snd_via82xx_codec_read,
895  .wait = snd_via82xx_codec_wait,
896  };
897 
898  if ((err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus)) < 0)
899  return err;
900  chip->ac97_bus->private_free = snd_via82xx_mixer_free_ac97_bus;
901  chip->ac97_bus->clock = chip->ac97_clock;
902 
903  memset(&ac97, 0, sizeof(ac97));
904  ac97.private_data = chip;
905  ac97.private_free = snd_via82xx_mixer_free_ac97;
906  ac97.pci = chip->pci;
907  ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
908  ac97.num = chip->ac97_secondary;
909 
910  if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
911  return err;
912 
913  return 0;
914 }
915 
916 
917 /*
918  * proc interface
919  */
920 static void snd_via82xx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
921 {
922  struct via82xx_modem *chip = entry->private_data;
923  int i;
924 
925  snd_iprintf(buffer, "%s\n\n", chip->card->longname);
926  for (i = 0; i < 0xa0; i += 4) {
927  snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
928  }
929 }
930 
931 static void __devinit snd_via82xx_proc_init(struct via82xx_modem *chip)
932 {
933  struct snd_info_entry *entry;
934 
935  if (! snd_card_proc_new(chip->card, "via82xx", &entry))
936  snd_info_set_text_ops(entry, chip, snd_via82xx_proc_read);
937 }
938 
939 /*
940  *
941  */
942 
943 static int snd_via82xx_chip_init(struct via82xx_modem *chip)
944 {
945  unsigned int val;
946  unsigned long end_time;
947  unsigned char pval;
948 
949  pci_read_config_byte(chip->pci, VIA_MC97_CTRL, &pval);
950  if((pval & VIA_MC97_CTRL_INIT) != VIA_MC97_CTRL_INIT) {
951  pci_write_config_byte(chip->pci, 0x44, pval|VIA_MC97_CTRL_INIT);
952  udelay(100);
953  }
954 
955  pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
956  if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
957  /* deassert ACLink reset, force SYNC */
958  pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
959  VIA_ACLINK_CTRL_ENABLE |
960  VIA_ACLINK_CTRL_RESET |
961  VIA_ACLINK_CTRL_SYNC);
962  udelay(100);
963 #if 1 /* FIXME: should we do full reset here for all chip models? */
964  pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
965  udelay(100);
966 #else
967  /* deassert ACLink reset, force SYNC (warm AC'97 reset) */
968  pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
969  VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
970  udelay(2);
971 #endif
972  /* ACLink on, deassert ACLink reset, VSR, SGD data out */
973  pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
974  udelay(100);
975  }
976 
977  pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
978  if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
979  /* ACLink on, deassert ACLink reset, VSR, SGD data out */
980  pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
981  udelay(100);
982  }
983 
984  /* wait until codec ready */
985  end_time = jiffies + msecs_to_jiffies(750);
986  do {
987  pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
988  if (pval & VIA_ACLINK_C00_READY) /* primary codec ready */
989  break;
990  schedule_timeout_uninterruptible(1);
991  } while (time_before(jiffies, end_time));
992 
993  if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY)
994  snd_printk(KERN_ERR "AC'97 codec is not ready [0x%x]\n", val);
995 
996  snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
997  VIA_REG_AC97_SECONDARY_VALID |
998  (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
999  end_time = jiffies + msecs_to_jiffies(750);
1000  snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
1001  VIA_REG_AC97_SECONDARY_VALID |
1002  (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
1003  do {
1004  if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_SECONDARY_VALID) {
1005  chip->ac97_secondary = 1;
1006  goto __ac97_ok2;
1007  }
1008  schedule_timeout_uninterruptible(1);
1009  } while (time_before(jiffies, end_time));
1010  /* This is ok, the most of motherboards have only one codec */
1011 
1012  __ac97_ok2:
1013 
1014  /* route FM trap to IRQ, disable FM trap */
1015  // pci_write_config_byte(chip->pci, VIA_FM_NMI_CTRL, 0);
1016  /* disable all GPI interrupts */
1017  outl(0, VIAREG(chip, GPI_INTR));
1018 
1019  return 0;
1020 }
1021 
1022 #ifdef CONFIG_PM_SLEEP
1023 /*
1024  * power management
1025  */
1026 static int snd_via82xx_suspend(struct device *dev)
1027 {
1028  struct pci_dev *pci = to_pci_dev(dev);
1029  struct snd_card *card = dev_get_drvdata(dev);
1030  struct via82xx_modem *chip = card->private_data;
1031  int i;
1032 
1033  snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1034  for (i = 0; i < 2; i++)
1035  snd_pcm_suspend_all(chip->pcms[i]);
1036  for (i = 0; i < chip->num_devs; i++)
1037  snd_via82xx_channel_reset(chip, &chip->devs[i]);
1038  synchronize_irq(chip->irq);
1039  snd_ac97_suspend(chip->ac97);
1040 
1041  pci_disable_device(pci);
1042  pci_save_state(pci);
1043  pci_set_power_state(pci, PCI_D3hot);
1044  return 0;
1045 }
1046 
1047 static int snd_via82xx_resume(struct device *dev)
1048 {
1049  struct pci_dev *pci = to_pci_dev(dev);
1050  struct snd_card *card = dev_get_drvdata(dev);
1051  struct via82xx_modem *chip = card->private_data;
1052  int i;
1053 
1054  pci_set_power_state(pci, PCI_D0);
1055  pci_restore_state(pci);
1056  if (pci_enable_device(pci) < 0) {
1057  printk(KERN_ERR "via82xx-modem: pci_enable_device failed, "
1058  "disabling device\n");
1059  snd_card_disconnect(card);
1060  return -EIO;
1061  }
1062  pci_set_master(pci);
1063 
1064  snd_via82xx_chip_init(chip);
1065 
1066  snd_ac97_resume(chip->ac97);
1067 
1068  for (i = 0; i < chip->num_devs; i++)
1069  snd_via82xx_channel_reset(chip, &chip->devs[i]);
1070 
1071  snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1072  return 0;
1073 }
1074 
1075 static SIMPLE_DEV_PM_OPS(snd_via82xx_pm, snd_via82xx_suspend, snd_via82xx_resume);
1076 #define SND_VIA82XX_PM_OPS &snd_via82xx_pm
1077 #else
1078 #define SND_VIA82XX_PM_OPS NULL
1079 #endif /* CONFIG_PM_SLEEP */
1080 
1081 static int snd_via82xx_free(struct via82xx_modem *chip)
1082 {
1083  unsigned int i;
1084 
1085  if (chip->irq < 0)
1086  goto __end_hw;
1087  /* disable interrupts */
1088  for (i = 0; i < chip->num_devs; i++)
1089  snd_via82xx_channel_reset(chip, &chip->devs[i]);
1090 
1091  __end_hw:
1092  if (chip->irq >= 0)
1093  free_irq(chip->irq, chip);
1094  pci_release_regions(chip->pci);
1095  pci_disable_device(chip->pci);
1096  kfree(chip);
1097  return 0;
1098 }
1099 
1100 static int snd_via82xx_dev_free(struct snd_device *device)
1101 {
1102  struct via82xx_modem *chip = device->device_data;
1103  return snd_via82xx_free(chip);
1104 }
1105 
1106 static int __devinit snd_via82xx_create(struct snd_card *card,
1107  struct pci_dev *pci,
1108  int chip_type,
1109  int revision,
1110  unsigned int ac97_clock,
1111  struct via82xx_modem ** r_via)
1112 {
1113  struct via82xx_modem *chip;
1114  int err;
1115  static struct snd_device_ops ops = {
1116  .dev_free = snd_via82xx_dev_free,
1117  };
1118 
1119  if ((err = pci_enable_device(pci)) < 0)
1120  return err;
1121 
1122  if ((chip = kzalloc(sizeof(*chip), GFP_KERNEL)) == NULL) {
1123  pci_disable_device(pci);
1124  return -ENOMEM;
1125  }
1126 
1127  spin_lock_init(&chip->reg_lock);
1128  chip->card = card;
1129  chip->pci = pci;
1130  chip->irq = -1;
1131 
1132  if ((err = pci_request_regions(pci, card->driver)) < 0) {
1133  kfree(chip);
1134  pci_disable_device(pci);
1135  return err;
1136  }
1137  chip->port = pci_resource_start(pci, 0);
1138  if (request_irq(pci->irq, snd_via82xx_interrupt, IRQF_SHARED,
1139  KBUILD_MODNAME, chip)) {
1140  snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
1141  snd_via82xx_free(chip);
1142  return -EBUSY;
1143  }
1144  chip->irq = pci->irq;
1145  if (ac97_clock >= 8000 && ac97_clock <= 48000)
1146  chip->ac97_clock = ac97_clock;
1147  synchronize_irq(chip->irq);
1148 
1149  if ((err = snd_via82xx_chip_init(chip)) < 0) {
1150  snd_via82xx_free(chip);
1151  return err;
1152  }
1153 
1154  if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
1155  snd_via82xx_free(chip);
1156  return err;
1157  }
1158 
1159  /* The 8233 ac97 controller does not implement the master bit
1160  * in the pci command register. IMHO this is a violation of the PCI spec.
1161  * We call pci_set_master here because it does not hurt. */
1162  pci_set_master(pci);
1163 
1164  snd_card_set_dev(card, &pci->dev);
1165 
1166  *r_via = chip;
1167  return 0;
1168 }
1169 
1170 
1171 static int __devinit snd_via82xx_probe(struct pci_dev *pci,
1172  const struct pci_device_id *pci_id)
1173 {
1174  struct snd_card *card;
1175  struct via82xx_modem *chip;
1176  int chip_type = 0, card_type;
1177  unsigned int i;
1178  int err;
1179 
1180  err = snd_card_create(index, id, THIS_MODULE, 0, &card);
1181  if (err < 0)
1182  return err;
1183 
1184  card_type = pci_id->driver_data;
1185  switch (card_type) {
1186  case TYPE_CARD_VIA82XX_MODEM:
1187  strcpy(card->driver, "VIA82XX-MODEM");
1188  sprintf(card->shortname, "VIA 82XX modem");
1189  break;
1190  default:
1191  snd_printk(KERN_ERR "invalid card type %d\n", card_type);
1192  err = -EINVAL;
1193  goto __error;
1194  }
1195 
1196  if ((err = snd_via82xx_create(card, pci, chip_type, pci->revision,
1197  ac97_clock, &chip)) < 0)
1198  goto __error;
1199  card->private_data = chip;
1200  if ((err = snd_via82xx_mixer_new(chip)) < 0)
1201  goto __error;
1202 
1203  if ((err = snd_via686_pcm_new(chip)) < 0 )
1204  goto __error;
1205 
1206  /* disable interrupts */
1207  for (i = 0; i < chip->num_devs; i++)
1208  snd_via82xx_channel_reset(chip, &chip->devs[i]);
1209 
1210  sprintf(card->longname, "%s at 0x%lx, irq %d",
1211  card->shortname, chip->port, chip->irq);
1212 
1213  snd_via82xx_proc_init(chip);
1214 
1215  if ((err = snd_card_register(card)) < 0) {
1216  snd_card_free(card);
1217  return err;
1218  }
1219  pci_set_drvdata(pci, card);
1220  return 0;
1221 
1222  __error:
1223  snd_card_free(card);
1224  return err;
1225 }
1226 
1227 static void __devexit snd_via82xx_remove(struct pci_dev *pci)
1228 {
1229  snd_card_free(pci_get_drvdata(pci));
1230  pci_set_drvdata(pci, NULL);
1231 }
1232 
1233 static struct pci_driver via82xx_modem_driver = {
1234  .name = KBUILD_MODNAME,
1235  .id_table = snd_via82xx_modem_ids,
1236  .probe = snd_via82xx_probe,
1237  .remove = __devexit_p(snd_via82xx_remove),
1238  .driver = {
1239  .pm = SND_VIA82XX_PM_OPS,
1240  },
1241 };
1242 
1243 module_pci_driver(via82xx_modem_driver);
Generated on Thu Jan 10 2013 15:07:14 for Linux Kernel by   doxygen 1.8.2