smackfs: do not trust `count' in inodes write()s
[sfrench/cifs-2.6.git] / sound / mips / au1x00.c
1 /*
2  * BRIEF MODULE DESCRIPTION
3  *  Driver for AMD Au1000 MIPS Processor, AC'97 Sound Port
4  *
5  * Copyright 2004 Cooper Street Innovations Inc.
6  * Author: Charles Eidsness     <charles@cooper-street.com>
7  *
8  *  This program is free software; you can redistribute  it and/or modify it
9  *  under  the terms of  the GNU General  Public License as published by the
10  *  Free Software Foundation;  either version 2 of the  License, or (at your
11  *  option) any later version.
12  *
13  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
14  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
15  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
16  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
17  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
19  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
21  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23  *
24  *  You should have received a copy of the  GNU General Public License along
25  *  with this program; if not, write  to the Free Software Foundation, Inc.,
26  *  675 Mass Ave, Cambridge, MA 02139, USA.
27  *
28  * History:
29  *
30  * 2004-09-09 Charles Eidsness  -- Original verion -- based on
31  *                                sa11xx-uda1341.c ALSA driver and the
32  *                                au1000.c OSS driver.
33  * 2004-09-09 Matt Porter       -- Added support for ALSA 1.0.6
34  *
35  */
36
37 #include <linux/ioport.h>
38 #include <linux/interrupt.h>
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/version.h>
42 #include <sound/core.h>
43 #include <sound/initval.h>
44 #include <sound/pcm.h>
45 #include <sound/pcm_params.h>
46 #include <sound/ac97_codec.h>
47 #include <asm/mach-au1x00/au1000.h>
48 #include <asm/mach-au1x00/au1000_dma.h>
49
50 MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
51 MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
52 MODULE_LICENSE("GPL");
53 MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
54
55 #define PLAYBACK 0
56 #define CAPTURE 1
57 #define AC97_SLOT_3 0x01
58 #define AC97_SLOT_4 0x02
59 #define AC97_SLOT_6 0x08
60 #define AC97_CMD_IRQ 31
61 #define READ 0
62 #define WRITE 1
63 #define READ_WAIT 2
64 #define RW_DONE 3
65
66 struct au1000_period
67 {
68         u32 start;
69         u32 relative_end;       /*realtive to start of buffer*/
70         struct au1000_period * next;
71 };
72
73 /*Au1000 AC97 Port Control Reisters*/
74 struct au1000_ac97_reg {
75         u32 volatile config;
76         u32 volatile status;
77         u32 volatile data;
78         u32 volatile cmd;
79         u32 volatile cntrl;
80 };
81
82 struct audio_stream {
83         struct snd_pcm_substream *substream;
84         int dma;
85         spinlock_t dma_lock;
86         struct au1000_period * buffer;
87         unsigned int period_size;
88         unsigned int periods;
89 };
90
91 struct snd_au1000 {
92         struct snd_card *card;
93         struct au1000_ac97_reg volatile *ac97_ioport;
94
95         struct resource *ac97_res_port;
96         spinlock_t ac97_lock;
97         struct snd_ac97 *ac97;
98
99         struct snd_pcm *pcm;
100         struct audio_stream *stream[2]; /* playback & capture */
101 };
102
103 /*--------------------------- Local Functions --------------------------------*/
104 static void
105 au1000_set_ac97_xmit_slots(struct snd_au1000 *au1000, long xmit_slots)
106 {
107         u32 volatile ac97_config;
108
109         spin_lock(&au1000->ac97_lock);
110         ac97_config = au1000->ac97_ioport->config;
111         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
112         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
113         au1000->ac97_ioport->config = ac97_config;
114         spin_unlock(&au1000->ac97_lock);
115 }
116
117 static void
118 au1000_set_ac97_recv_slots(struct snd_au1000 *au1000, long recv_slots)
119 {
120         u32 volatile ac97_config;
121
122         spin_lock(&au1000->ac97_lock);
123         ac97_config = au1000->ac97_ioport->config;
124         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
125         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
126         au1000->ac97_ioport->config = ac97_config;
127         spin_unlock(&au1000->ac97_lock);
128 }
129
130
131 static void
132 au1000_release_dma_link(struct audio_stream *stream)
133 {
134         struct au1000_period * pointer;
135         struct au1000_period * pointer_next;
136
137         stream->period_size = 0;
138         stream->periods = 0;
139         pointer = stream->buffer;
140         if (! pointer)
141                 return;
142         do {
143                 pointer_next = pointer->next;
144                 kfree(pointer);
145                 pointer = pointer_next;
146         } while (pointer != stream->buffer);
147         stream->buffer = NULL;
148 }
149
150 static int
151 au1000_setup_dma_link(struct audio_stream *stream, unsigned int period_bytes,
152                       unsigned int periods)
153 {
154         struct snd_pcm_substream *substream = stream->substream;
155         struct snd_pcm_runtime *runtime = substream->runtime;
156         struct au1000_period *pointer;
157         unsigned long dma_start;
158         int i;
159
160         dma_start = virt_to_phys(runtime->dma_area);
161
162         if (stream->period_size == period_bytes &&
163             stream->periods == periods)
164                 return 0; /* not changed */
165
166         au1000_release_dma_link(stream);
167
168         stream->period_size = period_bytes;
169         stream->periods = periods;
170
171         stream->buffer = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
172         if (! stream->buffer)
173                 return -ENOMEM;
174         pointer = stream->buffer;
175         for (i = 0; i < periods; i++) {
176                 pointer->start = (u32)(dma_start + (i * period_bytes));
177                 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
178                 if (i < periods - 1) {
179                         pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
180                         if (! pointer->next) {
181                                 au1000_release_dma_link(stream);
182                                 return -ENOMEM;
183                         }
184                         pointer = pointer->next;
185                 }
186         }
187         pointer->next = stream->buffer;
188         return 0;
189 }
190
191 static void
192 au1000_dma_stop(struct audio_stream *stream)
193 {
194         snd_assert(stream->buffer, return);
195         disable_dma(stream->dma);
196 }
197
198 static void
199 au1000_dma_start(struct audio_stream *stream)
200 {
201         snd_assert(stream->buffer, return);
202
203         init_dma(stream->dma);
204         if (get_dma_active_buffer(stream->dma) == 0) {
205                 clear_dma_done0(stream->dma);
206                 set_dma_addr0(stream->dma, stream->buffer->start);
207                 set_dma_count0(stream->dma, stream->period_size >> 1);
208                 set_dma_addr1(stream->dma, stream->buffer->next->start);
209                 set_dma_count1(stream->dma, stream->period_size >> 1);
210         } else {
211                 clear_dma_done1(stream->dma);
212                 set_dma_addr1(stream->dma, stream->buffer->start);
213                 set_dma_count1(stream->dma, stream->period_size >> 1);
214                 set_dma_addr0(stream->dma, stream->buffer->next->start);
215                 set_dma_count0(stream->dma, stream->period_size >> 1);
216         }
217         enable_dma_buffers(stream->dma);
218         start_dma(stream->dma);
219 }
220
221 static irqreturn_t
222 au1000_dma_interrupt(int irq, void *dev_id)
223 {
224         struct audio_stream *stream = (struct audio_stream *) dev_id;
225         struct snd_pcm_substream *substream = stream->substream;
226
227         spin_lock(&stream->dma_lock);
228         switch (get_dma_buffer_done(stream->dma)) {
229         case DMA_D0:
230                 stream->buffer = stream->buffer->next;
231                 clear_dma_done0(stream->dma);
232                 set_dma_addr0(stream->dma, stream->buffer->next->start);
233                 set_dma_count0(stream->dma, stream->period_size >> 1);
234                 enable_dma_buffer0(stream->dma);
235                 break;
236         case DMA_D1:
237                 stream->buffer = stream->buffer->next;
238                 clear_dma_done1(stream->dma);
239                 set_dma_addr1(stream->dma, stream->buffer->next->start);
240                 set_dma_count1(stream->dma, stream->period_size >> 1);
241                 enable_dma_buffer1(stream->dma);
242                 break;
243         case (DMA_D0 | DMA_D1):
244                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
245                 au1000_dma_stop(stream);
246                 au1000_dma_start(stream);
247                 break;
248         case (~DMA_D0 & ~DMA_D1):
249                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
250         }
251         spin_unlock(&stream->dma_lock);
252         snd_pcm_period_elapsed(substream);
253         return IRQ_HANDLED;
254 }
255
256 /*-------------------------- PCM Audio Streams -------------------------------*/
257
258 static unsigned int rates[] = {8000, 11025, 16000, 22050};
259 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
260         .count  = ARRAY_SIZE(rates),
261         .list   = rates,
262         .mask   = 0,
263 };
264
265 static struct snd_pcm_hardware snd_au1000_hw =
266 {
267         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
268                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
269         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
270         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
271                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
272         .rate_min               = 8000,
273         .rate_max               = 22050,
274         .channels_min           = 1,
275         .channels_max           = 2,
276         .buffer_bytes_max       = 128*1024,
277         .period_bytes_min       = 32,
278         .period_bytes_max       = 16*1024,
279         .periods_min            = 8,
280         .periods_max            = 255,
281         .fifo_size              = 16,
282 };
283
284 static int
285 snd_au1000_playback_open(struct snd_pcm_substream *substream)
286 {
287         struct snd_au1000 *au1000 = substream->pcm->private_data;
288
289         au1000->stream[PLAYBACK]->substream = substream;
290         au1000->stream[PLAYBACK]->buffer = NULL;
291         substream->private_data = au1000->stream[PLAYBACK];
292         substream->runtime->hw = snd_au1000_hw;
293         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
294                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
295 }
296
297 static int
298 snd_au1000_capture_open(struct snd_pcm_substream *substream)
299 {
300         struct snd_au1000 *au1000 = substream->pcm->private_data;
301
302         au1000->stream[CAPTURE]->substream = substream;
303         au1000->stream[CAPTURE]->buffer = NULL;
304         substream->private_data = au1000->stream[CAPTURE];
305         substream->runtime->hw = snd_au1000_hw;
306         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
307                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
308 }
309
310 static int
311 snd_au1000_playback_close(struct snd_pcm_substream *substream)
312 {
313         struct snd_au1000 *au1000 = substream->pcm->private_data;
314
315         au1000->stream[PLAYBACK]->substream = NULL;
316         return 0;
317 }
318
319 static int
320 snd_au1000_capture_close(struct snd_pcm_substream *substream)
321 {
322         struct snd_au1000 *au1000 = substream->pcm->private_data;
323
324         au1000->stream[CAPTURE]->substream = NULL;
325         return 0;
326 }
327
328 static int
329 snd_au1000_hw_params(struct snd_pcm_substream *substream,
330                                         struct snd_pcm_hw_params *hw_params)
331 {
332         struct audio_stream *stream = substream->private_data;
333         int err;
334
335         err = snd_pcm_lib_malloc_pages(substream,
336                                        params_buffer_bytes(hw_params));
337         if (err < 0)
338                 return err;
339         return au1000_setup_dma_link(stream,
340                                      params_period_bytes(hw_params),
341                                      params_periods(hw_params));
342 }
343
344 static int
345 snd_au1000_hw_free(struct snd_pcm_substream *substream)
346 {
347         struct audio_stream *stream = substream->private_data;
348         au1000_release_dma_link(stream);
349         return snd_pcm_lib_free_pages(substream);
350 }
351
352 static int
353 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
354 {
355         struct snd_au1000 *au1000 = substream->pcm->private_data;
356         struct snd_pcm_runtime *runtime = substream->runtime;
357
358         if (runtime->channels == 1)
359                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
360         else
361                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
362         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
363         return 0;
364 }
365
366 static int
367 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
368 {
369         struct snd_au1000 *au1000 = substream->pcm->private_data;
370         struct snd_pcm_runtime *runtime = substream->runtime;
371
372         if (runtime->channels == 1)
373                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
374         else
375                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
376         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
377         return 0;
378 }
379
380 static int
381 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
382 {
383         struct audio_stream *stream = substream->private_data;
384         int err = 0;
385
386         spin_lock(&stream->dma_lock);
387         switch (cmd) {
388         case SNDRV_PCM_TRIGGER_START:
389                 au1000_dma_start(stream);
390                 break;
391         case SNDRV_PCM_TRIGGER_STOP:
392                 au1000_dma_stop(stream);
393                 break;
394         default:
395                 err = -EINVAL;
396                 break;
397         }
398         spin_unlock(&stream->dma_lock);
399         return err;
400 }
401
402 static snd_pcm_uframes_t
403 snd_au1000_pointer(struct snd_pcm_substream *substream)
404 {
405         struct audio_stream *stream = substream->private_data;
406         struct snd_pcm_runtime *runtime = substream->runtime;
407         long location;
408
409         spin_lock(&stream->dma_lock);
410         location = get_dma_residue(stream->dma);
411         spin_unlock(&stream->dma_lock);
412         location = stream->buffer->relative_end - location;
413         if (location == -1)
414                 location = 0;
415         return bytes_to_frames(runtime,location);
416 }
417
418 static struct snd_pcm_ops snd_card_au1000_playback_ops = {
419         .open                   = snd_au1000_playback_open,
420         .close                  = snd_au1000_playback_close,
421         .ioctl                  = snd_pcm_lib_ioctl,
422         .hw_params              = snd_au1000_hw_params,
423         .hw_free                = snd_au1000_hw_free,
424         .prepare                = snd_au1000_playback_prepare,
425         .trigger                = snd_au1000_trigger,
426         .pointer                = snd_au1000_pointer,
427 };
428
429 static struct snd_pcm_ops snd_card_au1000_capture_ops = {
430         .open                   = snd_au1000_capture_open,
431         .close                  = snd_au1000_capture_close,
432         .ioctl                  = snd_pcm_lib_ioctl,
433         .hw_params              = snd_au1000_hw_params,
434         .hw_free                = snd_au1000_hw_free,
435         .prepare                = snd_au1000_capture_prepare,
436         .trigger                = snd_au1000_trigger,
437         .pointer                = snd_au1000_pointer,
438 };
439
440 static int __devinit
441 snd_au1000_pcm_new(struct snd_au1000 *au1000)
442 {
443         struct snd_pcm *pcm;
444         int err;
445         unsigned long flags;
446
447         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
448                 return err;
449
450         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
451                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
452
453         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
454                 &snd_card_au1000_playback_ops);
455         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
456                 &snd_card_au1000_capture_ops);
457
458         pcm->private_data = au1000;
459         pcm->info_flags = 0;
460         strcpy(pcm->name, "Au1000 AC97 PCM");
461
462         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
463         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
464
465         flags = claim_dma_lock();
466         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
467                         "AC97 TX", au1000_dma_interrupt, IRQF_DISABLED,
468                         au1000->stream[PLAYBACK])) < 0) {
469                 release_dma_lock(flags);
470                 return -EBUSY;
471         }
472         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
473                         "AC97 RX", au1000_dma_interrupt, IRQF_DISABLED,
474                         au1000->stream[CAPTURE])) < 0){
475                 release_dma_lock(flags);
476                 return -EBUSY;
477         }
478         /* enable DMA coherency in read/write DMA channels */
479         set_dma_mode(au1000->stream[PLAYBACK]->dma,
480                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
481         set_dma_mode(au1000->stream[CAPTURE]->dma,
482                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
483         release_dma_lock(flags);
484         au1000->pcm = pcm;
485         return 0;
486 }
487
488
489 /*-------------------------- AC97 CODEC Control ------------------------------*/
490
491 static unsigned short
492 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
493 {
494         struct snd_au1000 *au1000 = ac97->private_data;
495         u32 volatile cmd;
496         u16 volatile data;
497         int             i;
498
499         spin_lock(&au1000->ac97_lock);
500 /* would rather use the interrupt than this polling but it works and I can't
501 get the interrupt driven case to work efficiently */
502         for (i = 0; i < 0x5000; i++)
503                 if (!(au1000->ac97_ioport->status & AC97C_CP))
504                         break;
505         if (i == 0x5000)
506                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
507
508         cmd = (u32) reg & AC97C_INDEX_MASK;
509         cmd |= AC97C_READ;
510         au1000->ac97_ioport->cmd = cmd;
511
512         /* now wait for the data */
513         for (i = 0; i < 0x5000; i++)
514                 if (!(au1000->ac97_ioport->status & AC97C_CP))
515                         break;
516         if (i == 0x5000) {
517                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
518                 return 0;
519         }
520
521         data = au1000->ac97_ioport->cmd & 0xffff;
522         spin_unlock(&au1000->ac97_lock);
523
524         return data;
525
526 }
527
528
529 static void
530 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
531 {
532         struct snd_au1000 *au1000 = ac97->private_data;
533         u32 cmd;
534         int i;
535
536         spin_lock(&au1000->ac97_lock);
537 /* would rather use the interrupt than this polling but it works and I can't
538 get the interrupt driven case to work efficiently */
539         for (i = 0; i < 0x5000; i++)
540                 if (!(au1000->ac97_ioport->status & AC97C_CP))
541                         break;
542         if (i == 0x5000)
543                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
544
545         cmd = (u32) reg & AC97C_INDEX_MASK;
546         cmd &= ~AC97C_READ;
547         cmd |= ((u32) val << AC97C_WD_BIT);
548         au1000->ac97_ioport->cmd = cmd;
549         spin_unlock(&au1000->ac97_lock);
550 }
551
552 static int __devinit
553 snd_au1000_ac97_new(struct snd_au1000 *au1000)
554 {
555         int err;
556         struct snd_ac97_bus *pbus;
557         struct snd_ac97_template ac97;
558         static struct snd_ac97_bus_ops ops = {
559                 .write = snd_au1000_ac97_write,
560                 .read = snd_au1000_ac97_read,
561         };
562
563         if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
564                         0x100000, "Au1x00 AC97")) == NULL) {
565                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
566                 return -EBUSY;
567         }
568         au1000->ac97_ioport = (struct au1000_ac97_reg *)
569                 KSEG1ADDR(au1000->ac97_res_port->start);
570
571         spin_lock_init(&au1000->ac97_lock);
572
573         /* configure pins for AC'97
574         TODO: move to board_setup.c */
575         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
576
577         /* Initialise Au1000's AC'97 Control Block */
578         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
579         udelay(10);
580         au1000->ac97_ioport->cntrl = AC97C_CE;
581         udelay(10);
582
583         /* Initialise External CODEC -- cold reset */
584         au1000->ac97_ioport->config = AC97C_RESET;
585         udelay(10);
586         au1000->ac97_ioport->config = 0x0;
587         mdelay(5);
588
589         /* Initialise AC97 middle-layer */
590         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
591                 return err;
592
593         memset(&ac97, 0, sizeof(ac97));
594         ac97.private_data = au1000;
595         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
596                 return err;
597
598         return 0;
599 }
600
601 /*------------------------------ Setup / Destroy ----------------------------*/
602
603 void
604 snd_au1000_free(struct snd_card *card)
605 {
606         struct snd_au1000 *au1000 = card->private_data;
607
608         if (au1000->ac97_res_port) {
609                 /* put internal AC97 block into reset */
610                 au1000->ac97_ioport->cntrl = AC97C_RS;
611                 au1000->ac97_ioport = NULL;
612                 release_and_free_resource(au1000->ac97_res_port);
613         }
614
615         if (au1000->stream[PLAYBACK]) {
616                 if (au1000->stream[PLAYBACK]->dma >= 0)
617                         free_au1000_dma(au1000->stream[PLAYBACK]->dma);
618                 kfree(au1000->stream[PLAYBACK]);
619         }
620
621         if (au1000->stream[CAPTURE]) {
622                 if (au1000->stream[CAPTURE]->dma >= 0)
623                         free_au1000_dma(au1000->stream[CAPTURE]->dma);
624                 kfree(au1000->stream[CAPTURE]);
625         }
626 }
627
628
629 static struct snd_card *au1000_card;
630
631 static int __init
632 au1000_init(void)
633 {
634         int err;
635         struct snd_card *card;
636         struct snd_au1000 *au1000;
637
638         card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(struct snd_au1000));
639         if (card == NULL)
640                 return -ENOMEM;
641
642         card->private_free = snd_au1000_free;
643         au1000 = card->private_data;
644         au1000->card = card;
645
646         au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
647         au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
648         /* so that snd_au1000_free will work as intended */
649         au1000->ac97_res_port = NULL;
650         if (au1000->stream[PLAYBACK])
651                 au1000->stream[PLAYBACK]->dma = -1;
652         if (au1000->stream[CAPTURE ])
653                 au1000->stream[CAPTURE ]->dma = -1;
654
655         if (au1000->stream[PLAYBACK] == NULL ||
656             au1000->stream[CAPTURE ] == NULL) {
657                 snd_card_free(card);
658                 return -ENOMEM;
659         }
660
661         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
662                 snd_card_free(card);
663                 return err;
664         }
665
666         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
667                 snd_card_free(card);
668                 return err;
669         }
670
671         strcpy(card->driver, "Au1000-AC97");
672         strcpy(card->shortname, "AMD Au1000-AC97");
673         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
674
675         if ((err = snd_card_register(card)) < 0) {
676                 snd_card_free(card);
677                 return err;
678         }
679
680         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
681         au1000_card = card;
682         return 0;
683 }
684
685 static void __exit au1000_exit(void)
686 {
687         snd_card_free(au1000_card);
688 }
689
690 module_init(au1000_init);
691 module_exit(au1000_exit);
692