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TOMOYO Linux Cross Reference
Linux/sound/pci/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 <perex@perex.cz>
  7  *                         Tjeerd.Mulder <Tjeerd.Mulder@fujitsu-siemens.com>
  8  *                    2002 Takashi Iwai <tiwai@suse.de>
  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 <sashak@alsa-project.org>
 30  *      Modified from original audio driver 'via82xx.c' to support AC97
 31  *      modems.
 32  */
 33 
 34 #include <linux/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 <perex@perex.cz>");
 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 const struct pci_device_id 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_array(VIA_TABLE_SIZE,
296                                                sizeof(*dev->idx_table),
297                                                GFP_KERNEL);
298                 if (! dev->idx_table)
299                         return -ENOMEM;
300         }
301 
302         /* fill the entries */
303         idx = 0;
304         ofs = 0;
305         for (i = 0; i < periods; i++) {
306                 rest = fragsize;
307                 /* fill descriptors for a period.
308                  * a period can be split to several descriptors if it's
309                  * over page boundary.
310                  */
311                 do {
312                         unsigned int r;
313                         unsigned int flag;
314                         unsigned int addr;
315 
316                         if (idx >= VIA_TABLE_SIZE) {
317                                 dev_err(&pci->dev, "too much table size!\n");
318                                 return -EINVAL;
319                         }
320                         addr = snd_pcm_sgbuf_get_addr(substream, ofs);
321                         ((u32 *)dev->table.area)[idx << 1] = cpu_to_le32(addr);
322                         r = PAGE_SIZE - (ofs % PAGE_SIZE);
323                         if (rest < r)
324                                 r = rest;
325                         rest -= r;
326                         if (! rest) {
327                                 if (i == periods - 1)
328                                         flag = VIA_TBL_BIT_EOL; /* buffer boundary */
329                                 else
330                                         flag = VIA_TBL_BIT_FLAG; /* period boundary */
331                         } else
332                                 flag = 0; /* period continues to the next */
333                         /*
334                         dev_dbg(&pci->dev,
335                                 "tbl %d: at %d  size %d (rest %d)\n",
336                                 idx, ofs, r, rest);
337                         */
338                         ((u32 *)dev->table.area)[(idx<<1) + 1] = cpu_to_le32(r | flag);
339                         dev->idx_table[idx].offset = ofs;
340                         dev->idx_table[idx].size = r;
341                         ofs += r;
342                         idx++;
343                 } while (rest > 0);
344         }
345         dev->tbl_entries = idx;
346         dev->bufsize = periods * fragsize;
347         dev->bufsize2 = dev->bufsize / 2;
348         return 0;
349 }
350 
351 
352 static int clean_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
353                            struct pci_dev *pci)
354 {
355         if (dev->table.area) {
356                 snd_dma_free_pages(&dev->table);
357                 dev->table.area = NULL;
358         }
359         kfree(dev->idx_table);
360         dev->idx_table = NULL;
361         return 0;
362 }
363 
364 /*
365  *  Basic I/O
366  */
367 
368 static inline unsigned int snd_via82xx_codec_xread(struct via82xx_modem *chip)
369 {
370         return inl(VIAREG(chip, AC97));
371 }
372  
373 static inline void snd_via82xx_codec_xwrite(struct via82xx_modem *chip, unsigned int val)
374 {
375         outl(val, VIAREG(chip, AC97));
376 }
377  
378 static int snd_via82xx_codec_ready(struct via82xx_modem *chip, int secondary)
379 {
380         unsigned int timeout = 1000;    /* 1ms */
381         unsigned int val;
382         
383         while (timeout-- > 0) {
384                 udelay(1);
385                 if (!((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY))
386                         return val & 0xffff;
387         }
388         dev_err(chip->card->dev, "codec_ready: codec %i is not ready [0x%x]\n",
389                    secondary, snd_via82xx_codec_xread(chip));
390         return -EIO;
391 }
392  
393 static int snd_via82xx_codec_valid(struct via82xx_modem *chip, int secondary)
394 {
395         unsigned int timeout = 1000;    /* 1ms */
396         unsigned int val, val1;
397         unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
398                                          VIA_REG_AC97_SECONDARY_VALID;
399         
400         while (timeout-- > 0) {
401                 val = snd_via82xx_codec_xread(chip);
402                 val1 = val & (VIA_REG_AC97_BUSY | stat);
403                 if (val1 == stat)
404                         return val & 0xffff;
405                 udelay(1);
406         }
407         return -EIO;
408 }
409  
410 static void snd_via82xx_codec_wait(struct snd_ac97 *ac97)
411 {
412         struct via82xx_modem *chip = ac97->private_data;
413         int err;
414         err = snd_via82xx_codec_ready(chip, ac97->num);
415         /* here we need to wait fairly for long time.. */
416         msleep(500);
417 }
418 
419 static void snd_via82xx_codec_write(struct snd_ac97 *ac97,
420                                     unsigned short reg,
421                                     unsigned short val)
422 {
423         struct via82xx_modem *chip = ac97->private_data;
424         unsigned int xval;
425         if(reg == AC97_GPIO_STATUS) {
426                 outl(val, VIAREG(chip, GPI_STATUS));
427                 return;
428         }       
429         xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
430         xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
431         xval |= reg << VIA_REG_AC97_CMD_SHIFT;
432         xval |= val << VIA_REG_AC97_DATA_SHIFT;
433         snd_via82xx_codec_xwrite(chip, xval);
434         snd_via82xx_codec_ready(chip, ac97->num);
435 }
436 
437 static unsigned short snd_via82xx_codec_read(struct snd_ac97 *ac97, unsigned short reg)
438 {
439         struct via82xx_modem *chip = ac97->private_data;
440         unsigned int xval, val = 0xffff;
441         int again = 0;
442 
443         xval = ac97->num << VIA_REG_AC97_CODEC_ID_SHIFT;
444         xval |= ac97->num ? VIA_REG_AC97_SECONDARY_VALID : VIA_REG_AC97_PRIMARY_VALID;
445         xval |= VIA_REG_AC97_READ;
446         xval |= (reg & 0x7f) << VIA_REG_AC97_CMD_SHIFT;
447         while (1) {
448                 if (again++ > 3) {
449                         dev_err(chip->card->dev,
450                                 "codec_read: codec %i is not valid [0x%x]\n",
451                                    ac97->num, snd_via82xx_codec_xread(chip));
452                         return 0xffff;
453                 }
454                 snd_via82xx_codec_xwrite(chip, xval);
455                 udelay (20);
456                 if (snd_via82xx_codec_valid(chip, ac97->num) >= 0) {
457                         udelay(25);
458                         val = snd_via82xx_codec_xread(chip);
459                         break;
460                 }
461         }
462         return val & 0xffff;
463 }
464 
465 static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
466 {
467         outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
468              VIADEV_REG(viadev, OFFSET_CONTROL));
469         inb(VIADEV_REG(viadev, OFFSET_CONTROL));
470         udelay(50);
471         /* disable interrupts */
472         outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
473         /* clear interrupts */
474         outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
475         outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
476         // outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
477         viadev->lastpos = 0;
478 }
479 
480 
481 /*
482  *  Interrupt handler
483  */
484 
485 static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id)
486 {
487         struct via82xx_modem *chip = dev_id;
488         unsigned int status;
489         unsigned int i;
490 
491         status = inl(VIAREG(chip, SGD_SHADOW));
492         if (! (status & chip->intr_mask)) {
493                 return IRQ_NONE;
494         }
495 // _skip_sgd:
496 
497         /* check status for each stream */
498         spin_lock(&chip->reg_lock);
499         for (i = 0; i < chip->num_devs; i++) {
500                 struct viadev *viadev = &chip->devs[i];
501                 unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
502                 c_status &= (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED);
503                 if (! c_status)
504                         continue;
505                 if (viadev->substream && viadev->running) {
506                         spin_unlock(&chip->reg_lock);
507                         snd_pcm_period_elapsed(viadev->substream);
508                         spin_lock(&chip->reg_lock);
509                 }
510                 outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
511         }
512         spin_unlock(&chip->reg_lock);
513         return IRQ_HANDLED;
514 }
515 
516 /*
517  *  PCM callbacks
518  */
519 
520 /*
521  * trigger callback
522  */
523 static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
524 {
525         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
526         struct viadev *viadev = substream->runtime->private_data;
527         unsigned char val = 0;
528 
529         switch (cmd) {
530         case SNDRV_PCM_TRIGGER_START:
531         case SNDRV_PCM_TRIGGER_SUSPEND:
532                 val |= VIA_REG_CTRL_START;
533                 viadev->running = 1;
534                 break;
535         case SNDRV_PCM_TRIGGER_STOP:
536                 val = VIA_REG_CTRL_TERMINATE;
537                 viadev->running = 0;
538                 break;
539         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
540                 val |= VIA_REG_CTRL_PAUSE;
541                 viadev->running = 0;
542                 break;
543         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
544                 viadev->running = 1;
545                 break;
546         default:
547                 return -EINVAL;
548         }
549         outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
550         if (cmd == SNDRV_PCM_TRIGGER_STOP)
551                 snd_via82xx_channel_reset(chip, viadev);
552         return 0;
553 }
554 
555 /*
556  * pointer callbacks
557  */
558 
559 /*
560  * calculate the linear position at the given sg-buffer index and the rest count
561  */
562 
563 #define check_invalid_pos(viadev,pos) \
564         ((pos) < viadev->lastpos && ((pos) >= viadev->bufsize2 ||\
565                                      viadev->lastpos < viadev->bufsize2))
566 
567 static inline unsigned int calc_linear_pos(struct via82xx_modem *chip,
568                                            struct viadev *viadev,
569                                            unsigned int idx,
570                                            unsigned int count)
571 {
572         unsigned int size, res;
573 
574         size = viadev->idx_table[idx].size;
575         res = viadev->idx_table[idx].offset + size - count;
576 
577         /* check the validity of the calculated position */
578         if (size < count) {
579                 dev_err(chip->card->dev,
580                         "invalid via82xx_cur_ptr (size = %d, count = %d)\n",
581                            (int)size, (int)count);
582                 res = viadev->lastpos;
583         } else if (check_invalid_pos(viadev, res)) {
584 #ifdef POINTER_DEBUG
585                 dev_dbg(chip->card->dev,
586                         "fail: idx = %i/%i, lastpos = 0x%x, bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, count = 0x%x\n",
587                         idx, viadev->tbl_entries, viadev->lastpos,
588                        viadev->bufsize2, viadev->idx_table[idx].offset,
589                        viadev->idx_table[idx].size, count);
590 #endif
591                 if (count && size < count) {
592                         dev_dbg(chip->card->dev,
593                                 "invalid via82xx_cur_ptr, using last valid pointer\n");
594                         res = viadev->lastpos;
595                 } else {
596                         if (! count)
597                                 /* bogus count 0 on the DMA boundary? */
598                                 res = viadev->idx_table[idx].offset;
599                         else
600                                 /* count register returns full size
601                                  * when end of buffer is reached
602                                  */
603                                 res = viadev->idx_table[idx].offset + size;
604                         if (check_invalid_pos(viadev, res)) {
605                                 dev_dbg(chip->card->dev,
606                                         "invalid via82xx_cur_ptr (2), using last valid pointer\n");
607                                 res = viadev->lastpos;
608                         }
609                 }
610         }
611         viadev->lastpos = res; /* remember the last position */
612         if (res >= viadev->bufsize)
613                 res -= viadev->bufsize;
614         return res;
615 }
616 
617 /*
618  * get the current pointer on via686
619  */
620 static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
621 {
622         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
623         struct viadev *viadev = substream->runtime->private_data;
624         unsigned int idx, ptr, count, res;
625 
626         if (snd_BUG_ON(!viadev->tbl_entries))
627                 return 0;
628         if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
629                 return 0;
630 
631         spin_lock(&chip->reg_lock);
632         count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
633         /* The via686a does not have the current index register,
634          * so we need to calculate the index from CURR_PTR.
635          */
636         ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
637         if (ptr <= (unsigned int)viadev->table.addr)
638                 idx = 0;
639         else /* CURR_PTR holds the address + 8 */
640                 idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) %
641                         viadev->tbl_entries;
642         res = calc_linear_pos(chip, viadev, idx, count);
643         spin_unlock(&chip->reg_lock);
644 
645         return bytes_to_frames(substream->runtime, res);
646 }
647 
648 /*
649  * hw_params callback:
650  * allocate the buffer and build up the buffer description table
651  */
652 static int snd_via82xx_hw_params(struct snd_pcm_substream *substream,
653                                  struct snd_pcm_hw_params *hw_params)
654 {
655         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
656         struct viadev *viadev = substream->runtime->private_data;
657         int err;
658 
659         err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
660         if (err < 0)
661                 return err;
662         err = build_via_table(viadev, substream, chip->pci,
663                               params_periods(hw_params),
664                               params_period_bytes(hw_params));
665         if (err < 0)
666                 return err;
667 
668         snd_ac97_write(chip->ac97, AC97_LINE1_RATE, params_rate(hw_params));
669         snd_ac97_write(chip->ac97, AC97_LINE1_LEVEL, 0);
670 
671         return 0;
672 }
673 
674 /*
675  * hw_free callback:
676  * clean up the buffer description table and release the buffer
677  */
678 static int snd_via82xx_hw_free(struct snd_pcm_substream *substream)
679 {
680         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
681         struct viadev *viadev = substream->runtime->private_data;
682 
683         clean_via_table(viadev, substream, chip->pci);
684         snd_pcm_lib_free_pages(substream);
685         return 0;
686 }
687 
688 
689 /*
690  * set up the table pointer
691  */
692 static void snd_via82xx_set_table_ptr(struct via82xx_modem *chip, struct viadev *viadev)
693 {
694         snd_via82xx_codec_ready(chip, chip->ac97_secondary);
695         outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
696         udelay(20);
697         snd_via82xx_codec_ready(chip, chip->ac97_secondary);
698 }
699 
700 /*
701  * prepare callback for playback and capture
702  */
703 static int snd_via82xx_pcm_prepare(struct snd_pcm_substream *substream)
704 {
705         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
706         struct viadev *viadev = substream->runtime->private_data;
707 
708         snd_via82xx_channel_reset(chip, viadev);
709         /* this must be set after channel_reset */
710         snd_via82xx_set_table_ptr(chip, viadev);
711         outb(VIA_REG_TYPE_AUTOSTART|VIA_REG_TYPE_INT_EOL|VIA_REG_TYPE_INT_FLAG,
712              VIADEV_REG(viadev, OFFSET_TYPE));
713         return 0;
714 }
715 
716 /*
717  * pcm hardware definition, identical for both playback and capture
718  */
719 static const struct snd_pcm_hardware snd_via82xx_hw =
720 {
721         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
722                                  SNDRV_PCM_INFO_BLOCK_TRANSFER |
723                                  SNDRV_PCM_INFO_MMAP_VALID |
724                                  /* SNDRV_PCM_INFO_RESUME | */
725                                  SNDRV_PCM_INFO_PAUSE),
726         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
727         .rates =                SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_KNOT,
728         .rate_min =             8000,
729         .rate_max =             16000,
730         .channels_min =         1,
731         .channels_max =         1,
732         .buffer_bytes_max =     128 * 1024,
733         .period_bytes_min =     32,
734         .period_bytes_max =     128 * 1024,
735         .periods_min =          2,
736         .periods_max =          VIA_TABLE_SIZE / 2,
737         .fifo_size =            0,
738 };
739 
740 
741 /*
742  * open callback skeleton
743  */
744 static int snd_via82xx_modem_pcm_open(struct via82xx_modem *chip, struct viadev *viadev,
745                                       struct snd_pcm_substream *substream)
746 {
747         struct snd_pcm_runtime *runtime = substream->runtime;
748         int err;
749         static const unsigned int rates[] = { 8000,  9600, 12000, 16000 };
750         static const struct snd_pcm_hw_constraint_list hw_constraints_rates = {
751                 .count = ARRAY_SIZE(rates),
752                 .list = rates,
753                 .mask = 0,
754         };
755 
756         runtime->hw = snd_via82xx_hw;
757         
758         if ((err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
759                                               &hw_constraints_rates)) < 0)
760                 return err;
761 
762         /* we may remove following constaint when we modify table entries
763            in interrupt */
764         if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
765                 return err;
766 
767         runtime->private_data = viadev;
768         viadev->substream = substream;
769 
770         return 0;
771 }
772 
773 
774 /*
775  * open callback for playback
776  */
777 static int snd_via82xx_playback_open(struct snd_pcm_substream *substream)
778 {
779         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
780         struct viadev *viadev = &chip->devs[chip->playback_devno + substream->number];
781 
782         return snd_via82xx_modem_pcm_open(chip, viadev, substream);
783 }
784 
785 /*
786  * open callback for capture
787  */
788 static int snd_via82xx_capture_open(struct snd_pcm_substream *substream)
789 {
790         struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
791         struct viadev *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];
792 
793         return snd_via82xx_modem_pcm_open(chip, viadev, substream);
794 }
795 
796 /*
797  * close callback
798  */
799 static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream)
800 {
801         struct viadev *viadev = substream->runtime->private_data;
802 
803         viadev->substream = NULL;
804         return 0;
805 }
806 
807 
808 /* via686 playback callbacks */
809 static const struct snd_pcm_ops snd_via686_playback_ops = {
810         .open =         snd_via82xx_playback_open,
811         .close =        snd_via82xx_pcm_close,
812         .ioctl =        snd_pcm_lib_ioctl,
813         .hw_params =    snd_via82xx_hw_params,
814         .hw_free =      snd_via82xx_hw_free,
815         .prepare =      snd_via82xx_pcm_prepare,
816         .trigger =      snd_via82xx_pcm_trigger,
817         .pointer =      snd_via686_pcm_pointer,
818         .page =         snd_pcm_sgbuf_ops_page,
819 };
820 
821 /* via686 capture callbacks */
822 static const struct snd_pcm_ops snd_via686_capture_ops = {
823         .open =         snd_via82xx_capture_open,
824         .close =        snd_via82xx_pcm_close,
825         .ioctl =        snd_pcm_lib_ioctl,
826         .hw_params =    snd_via82xx_hw_params,
827         .hw_free =      snd_via82xx_hw_free,
828         .prepare =      snd_via82xx_pcm_prepare,
829         .trigger =      snd_via82xx_pcm_trigger,
830         .pointer =      snd_via686_pcm_pointer,
831         .page =         snd_pcm_sgbuf_ops_page,
832 };
833 
834 
835 static void init_viadev(struct via82xx_modem *chip, int idx, unsigned int reg_offset,
836                         int direction)
837 {
838         chip->devs[idx].reg_offset = reg_offset;
839         chip->devs[idx].direction = direction;
840         chip->devs[idx].port = chip->port + reg_offset;
841 }
842 
843 /*
844  * create a pcm instance for via686a/b
845  */
846 static int snd_via686_pcm_new(struct via82xx_modem *chip)
847 {
848         struct snd_pcm *pcm;
849         int err;
850 
851         chip->playback_devno = 0;
852         chip->capture_devno = 1;
853         chip->num_devs = 2;
854         chip->intr_mask = 0x330000; /* FLAGS | EOL for MR, MW */
855 
856         err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
857         if (err < 0)
858                 return err;
859         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via686_playback_ops);
860         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via686_capture_ops);
861         pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
862         pcm->private_data = chip;
863         strcpy(pcm->name, chip->card->shortname);
864         chip->pcms[0] = pcm;
865         init_viadev(chip, 0, VIA_REG_MO_STATUS, 0);
866         init_viadev(chip, 1, VIA_REG_MI_STATUS, 1);
867 
868         if ((err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
869                                                          snd_dma_pci_data(chip->pci),
870                                                          64*1024, 128*1024)) < 0)
871                 return err;
872 
873         return 0;
874 }
875 
876 
877 /*
878  *  Mixer part
879  */
880 
881 
882 static void snd_via82xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
883 {
884         struct via82xx_modem *chip = bus->private_data;
885         chip->ac97_bus = NULL;
886 }
887 
888 static void snd_via82xx_mixer_free_ac97(struct snd_ac97 *ac97)
889 {
890         struct via82xx_modem *chip = ac97->private_data;
891         chip->ac97 = NULL;
892 }
893 
894 
895 static int snd_via82xx_mixer_new(struct via82xx_modem *chip)
896 {
897         struct snd_ac97_template ac97;
898         int err;
899         static struct snd_ac97_bus_ops ops = {
900                 .write = snd_via82xx_codec_write,
901                 .read = snd_via82xx_codec_read,
902                 .wait = snd_via82xx_codec_wait,
903         };
904 
905         if ((err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus)) < 0)
906                 return err;
907         chip->ac97_bus->private_free = snd_via82xx_mixer_free_ac97_bus;
908         chip->ac97_bus->clock = chip->ac97_clock;
909 
910         memset(&ac97, 0, sizeof(ac97));
911         ac97.private_data = chip;
912         ac97.private_free = snd_via82xx_mixer_free_ac97;
913         ac97.pci = chip->pci;
914         ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
915         ac97.num = chip->ac97_secondary;
916 
917         if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
918                 return err;
919 
920         return 0;
921 }
922 
923 
924 /*
925  * proc interface
926  */
927 static void snd_via82xx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
928 {
929         struct via82xx_modem *chip = entry->private_data;
930         int i;
931         
932         snd_iprintf(buffer, "%s\n\n", chip->card->longname);
933         for (i = 0; i < 0xa0; i += 4) {
934                 snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
935         }
936 }
937 
938 static void snd_via82xx_proc_init(struct via82xx_modem *chip)
939 {
940         struct snd_info_entry *entry;
941 
942         if (! snd_card_proc_new(chip->card, "via82xx", &entry))
943                 snd_info_set_text_ops(entry, chip, snd_via82xx_proc_read);
944 }
945 
946 /*
947  *
948  */
949 
950 static int snd_via82xx_chip_init(struct via82xx_modem *chip)
951 {
952         unsigned int val;
953         unsigned long end_time;
954         unsigned char pval;
955 
956         pci_read_config_byte(chip->pci, VIA_MC97_CTRL, &pval);
957         if((pval & VIA_MC97_CTRL_INIT) != VIA_MC97_CTRL_INIT) {
958                 pci_write_config_byte(chip->pci, 0x44, pval|VIA_MC97_CTRL_INIT);
959                 udelay(100);
960         }
961 
962         pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
963         if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
964                 /* deassert ACLink reset, force SYNC */
965                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
966                                       VIA_ACLINK_CTRL_ENABLE |
967                                       VIA_ACLINK_CTRL_RESET |
968                                       VIA_ACLINK_CTRL_SYNC);
969                 udelay(100);
970 #if 1 /* FIXME: should we do full reset here for all chip models? */
971                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
972                 udelay(100);
973 #else
974                 /* deassert ACLink reset, force SYNC (warm AC'97 reset) */
975                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
976                                       VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
977                 udelay(2);
978 #endif
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         pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
985         if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
986                 /* ACLink on, deassert ACLink reset, VSR, SGD data out */
987                 pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
988                 udelay(100);
989         }
990 
991         /* wait until codec ready */
992         end_time = jiffies + msecs_to_jiffies(750);
993         do {
994                 pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
995                 if (pval & VIA_ACLINK_C00_READY) /* primary codec ready */
996                         break;
997                 schedule_timeout_uninterruptible(1);
998         } while (time_before(jiffies, end_time));
999 
1000         if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY)
1001                 dev_err(chip->card->dev,
1002                         "AC'97 codec is not ready [0x%x]\n", val);
1003 
1004         snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
1005                                  VIA_REG_AC97_SECONDARY_VALID |
1006                                  (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
1007         end_time = jiffies + msecs_to_jiffies(750);
1008         snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
1009                                  VIA_REG_AC97_SECONDARY_VALID |
1010                                  (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
1011         do {
1012                 if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_SECONDARY_VALID) {
1013                         chip->ac97_secondary = 1;
1014                         goto __ac97_ok2;
1015                 }
1016                 schedule_timeout_uninterruptible(1);
1017         } while (time_before(jiffies, end_time));
1018         /* This is ok, the most of motherboards have only one codec */
1019 
1020       __ac97_ok2:
1021 
1022         /* route FM trap to IRQ, disable FM trap */
1023         // pci_write_config_byte(chip->pci, VIA_FM_NMI_CTRL, 0);
1024         /* disable all GPI interrupts */
1025         outl(0, VIAREG(chip, GPI_INTR));
1026 
1027         return 0;
1028 }
1029 
1030 #ifdef CONFIG_PM_SLEEP
1031 /*
1032  * power management
1033  */
1034 static int snd_via82xx_suspend(struct device *dev)
1035 {
1036         struct snd_card *card = dev_get_drvdata(dev);
1037         struct via82xx_modem *chip = card->private_data;
1038         int i;
1039 
1040         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1041         for (i = 0; i < 2; i++)
1042                 snd_pcm_suspend_all(chip->pcms[i]);
1043         for (i = 0; i < chip->num_devs; i++)
1044                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1045         synchronize_irq(chip->irq);
1046         snd_ac97_suspend(chip->ac97);
1047         return 0;
1048 }
1049 
1050 static int snd_via82xx_resume(struct device *dev)
1051 {
1052         struct snd_card *card = dev_get_drvdata(dev);
1053         struct via82xx_modem *chip = card->private_data;
1054         int i;
1055 
1056         snd_via82xx_chip_init(chip);
1057 
1058         snd_ac97_resume(chip->ac97);
1059 
1060         for (i = 0; i < chip->num_devs; i++)
1061                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1062 
1063         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1064         return 0;
1065 }
1066 
1067 static SIMPLE_DEV_PM_OPS(snd_via82xx_pm, snd_via82xx_suspend, snd_via82xx_resume);
1068 #define SND_VIA82XX_PM_OPS      &snd_via82xx_pm
1069 #else
1070 #define SND_VIA82XX_PM_OPS      NULL
1071 #endif /* CONFIG_PM_SLEEP */
1072 
1073 static int snd_via82xx_free(struct via82xx_modem *chip)
1074 {
1075         unsigned int i;
1076 
1077         if (chip->irq < 0)
1078                 goto __end_hw;
1079         /* disable interrupts */
1080         for (i = 0; i < chip->num_devs; i++)
1081                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1082 
1083       __end_hw:
1084         if (chip->irq >= 0)
1085                 free_irq(chip->irq, chip);
1086         pci_release_regions(chip->pci);
1087         pci_disable_device(chip->pci);
1088         kfree(chip);
1089         return 0;
1090 }
1091 
1092 static int snd_via82xx_dev_free(struct snd_device *device)
1093 {
1094         struct via82xx_modem *chip = device->device_data;
1095         return snd_via82xx_free(chip);
1096 }
1097 
1098 static int snd_via82xx_create(struct snd_card *card,
1099                               struct pci_dev *pci,
1100                               int chip_type,
1101                               int revision,
1102                               unsigned int ac97_clock,
1103                               struct via82xx_modem **r_via)
1104 {
1105         struct via82xx_modem *chip;
1106         int err;
1107         static struct snd_device_ops ops = {
1108                 .dev_free =     snd_via82xx_dev_free,
1109         };
1110 
1111         if ((err = pci_enable_device(pci)) < 0)
1112                 return err;
1113 
1114         if ((chip = kzalloc(sizeof(*chip), GFP_KERNEL)) == NULL) {
1115                 pci_disable_device(pci);
1116                 return -ENOMEM;
1117         }
1118 
1119         spin_lock_init(&chip->reg_lock);
1120         chip->card = card;
1121         chip->pci = pci;
1122         chip->irq = -1;
1123 
1124         if ((err = pci_request_regions(pci, card->driver)) < 0) {
1125                 kfree(chip);
1126                 pci_disable_device(pci);
1127                 return err;
1128         }
1129         chip->port = pci_resource_start(pci, 0);
1130         if (request_irq(pci->irq, snd_via82xx_interrupt, IRQF_SHARED,
1131                         KBUILD_MODNAME, chip)) {
1132                 dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
1133                 snd_via82xx_free(chip);
1134                 return -EBUSY;
1135         }
1136         chip->irq = pci->irq;
1137         if (ac97_clock >= 8000 && ac97_clock <= 48000)
1138                 chip->ac97_clock = ac97_clock;
1139         synchronize_irq(chip->irq);
1140 
1141         if ((err = snd_via82xx_chip_init(chip)) < 0) {
1142                 snd_via82xx_free(chip);
1143                 return err;
1144         }
1145 
1146         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
1147                 snd_via82xx_free(chip);
1148                 return err;
1149         }
1150 
1151         /* The 8233 ac97 controller does not implement the master bit
1152          * in the pci command register. IMHO this is a violation of the PCI spec.
1153          * We call pci_set_master here because it does not hurt. */
1154         pci_set_master(pci);
1155 
1156         *r_via = chip;
1157         return 0;
1158 }
1159 
1160 
1161 static int snd_via82xx_probe(struct pci_dev *pci,
1162                              const struct pci_device_id *pci_id)
1163 {
1164         struct snd_card *card;
1165         struct via82xx_modem *chip;
1166         int chip_type = 0, card_type;
1167         unsigned int i;
1168         int err;
1169 
1170         err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
1171         if (err < 0)
1172                 return err;
1173 
1174         card_type = pci_id->driver_data;
1175         switch (card_type) {
1176         case TYPE_CARD_VIA82XX_MODEM:
1177                 strcpy(card->driver, "VIA82XX-MODEM");
1178                 sprintf(card->shortname, "VIA 82XX modem");
1179                 break;
1180         default:
1181                 dev_err(card->dev, "invalid card type %d\n", card_type);
1182                 err = -EINVAL;
1183                 goto __error;
1184         }
1185                 
1186         if ((err = snd_via82xx_create(card, pci, chip_type, pci->revision,
1187                                       ac97_clock, &chip)) < 0)
1188                 goto __error;
1189         card->private_data = chip;
1190         if ((err = snd_via82xx_mixer_new(chip)) < 0)
1191                 goto __error;
1192 
1193         if ((err = snd_via686_pcm_new(chip)) < 0 )
1194                 goto __error;
1195 
1196         /* disable interrupts */
1197         for (i = 0; i < chip->num_devs; i++)
1198                 snd_via82xx_channel_reset(chip, &chip->devs[i]);
1199 
1200         sprintf(card->longname, "%s at 0x%lx, irq %d",
1201                 card->shortname, chip->port, chip->irq);
1202 
1203         snd_via82xx_proc_init(chip);
1204 
1205         if ((err = snd_card_register(card)) < 0) {
1206                 snd_card_free(card);
1207                 return err;
1208         }
1209         pci_set_drvdata(pci, card);
1210         return 0;
1211 
1212  __error:
1213         snd_card_free(card);
1214         return err;
1215 }
1216 
1217 static void snd_via82xx_remove(struct pci_dev *pci)
1218 {
1219         snd_card_free(pci_get_drvdata(pci));
1220 }
1221 
1222 static struct pci_driver via82xx_modem_driver = {
1223         .name = KBUILD_MODNAME,
1224         .id_table = snd_via82xx_modem_ids,
1225         .probe = snd_via82xx_probe,
1226         .remove = snd_via82xx_remove,
1227         .driver = {
1228                 .pm = SND_VIA82XX_PM_OPS,
1229         },
1230 };
1231 
1232 module_pci_driver(via82xx_modem_driver);
1233 

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