[ALSA] au1x00 - Code clean up
[linux-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 <sound/driver.h>
40 #include <linux/init.h>
41 #include <linux/slab.h>
42 #include <linux/version.h>
43 #include <sound/core.h>
44 #include <sound/initval.h>
45 #include <sound/pcm.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 typedef struct au1000_period au1000_period_t;
67 struct au1000_period
68 {
69         u32 start;
70         u32 relative_end;       /*realtive to start of buffer*/
71         au1000_period_t * next;
72 };
73
74 /*Au1000 AC97 Port Control Reisters*/
75 typedef struct au1000_ac97_reg au1000_ac97_reg_t;
76 struct au1000_ac97_reg {
77         u32 volatile config;
78         u32 volatile status;
79         u32 volatile data;
80         u32 volatile cmd;
81         u32 volatile cntrl;
82 };
83
84 typedef struct audio_stream audio_stream_t;
85 struct audio_stream {
86         snd_pcm_substream_t * substream;
87         int dma;
88         spinlock_t dma_lock;
89         au1000_period_t * buffer;
90         unsigned int period_size;
91         unsigned int periods;
92 };
93
94 typedef struct snd_card_au1000 {
95         snd_card_t *card;
96         au1000_ac97_reg_t volatile *ac97_ioport;
97
98         struct resource *ac97_res_port;
99         spinlock_t ac97_lock;
100         ac97_t *ac97;
101
102         snd_pcm_t *pcm;
103         audio_stream_t *stream[2];      /* playback & capture */
104 } au1000_t;
105
106 /*--------------------------- Local Functions --------------------------------*/
107 static void
108 au1000_set_ac97_xmit_slots(au1000_t *au1000, long xmit_slots)
109 {
110         u32 volatile ac97_config;
111
112         spin_lock(&au1000->ac97_lock);
113         ac97_config = au1000->ac97_ioport->config;
114         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
115         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
116         au1000->ac97_ioport->config = ac97_config;
117         spin_unlock(&au1000->ac97_lock);
118 }
119
120 static void
121 au1000_set_ac97_recv_slots(au1000_t *au1000, long recv_slots)
122 {
123         u32 volatile ac97_config;
124
125         spin_lock(&au1000->ac97_lock);
126         ac97_config = au1000->ac97_ioport->config;
127         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
128         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
129         au1000->ac97_ioport->config = ac97_config;
130         spin_unlock(&au1000->ac97_lock);
131 }
132
133
134 static void
135 au1000_release_dma_link(audio_stream_t *stream)
136 {
137         au1000_period_t * pointer;
138         au1000_period_t * pointer_next;
139
140         stream->period_size = 0;
141         stream->periods = 0;
142         pointer = stream->buffer;
143         if (! pointer)
144                 return;
145         do {
146                 pointer_next = pointer->next;
147                 kfree(pointer);
148                 pointer = pointer_next;
149         } while (pointer != stream->buffer);
150         stream->buffer = NULL;
151 }
152
153 static int
154 au1000_setup_dma_link(audio_stream_t *stream, unsigned int period_bytes,
155                       unsigned int periods)
156 {
157         snd_pcm_substream_t *substream = stream->substream;
158         snd_pcm_runtime_t *runtime = substream->runtime;
159         unsigned long dma_start;
160         int i;
161
162         dma_start = virt_to_phys(runtime->dma_area);
163
164         if (stream->period_size == period_bytes &&
165             stream->periods == periods)
166                 return 0; /* not changed */
167
168         au1000_release_dma_link(stream);
169
170         stream->period_size = period_bytes;
171         stream->periods = periods;
172
173         stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
174         if (! stream->buffer)
175                 return -ENOMEM;
176         pointer = stream->buffer;
177         for (i = 0; i < periods; i++) {
178                 pointer->start = (u32)(dma_start + (i * period_bytes));
179                 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
180                 if (i < periods - 1) {
181                         pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
182                         if (! pointer->next) {
183                                 au1000_release_dma_link(stream);
184                                 return -ENOMEM;
185                         }
186                         pointer = pointer->next;
187                 }
188         }
189         pointer->next = stream->buffer;
190         return 0;
191 }
192
193 static void
194 au1000_dma_stop(audio_stream_t *stream)
195 {
196         snd_assert(stream->buffer, return);
197         disable_dma(stream->dma);
198 }
199
200 static void
201 au1000_dma_start(audio_stream_t *stream)
202 {
203         snd_assert(stream->buffer, return);
204
205         init_dma(stream->dma);
206         if (get_dma_active_buffer(stream->dma) == 0) {
207                 clear_dma_done0(stream->dma);
208                 set_dma_addr0(stream->dma, stream->buffer->start);
209                 set_dma_count0(stream->dma, stream->period_size >> 1);
210                 set_dma_addr1(stream->dma, stream->buffer->next->start);
211                 set_dma_count1(stream->dma, stream->period_size >> 1);
212         } else {
213                 clear_dma_done1(stream->dma);
214                 set_dma_addr1(stream->dma, stream->buffer->start);
215                 set_dma_count1(stream->dma, stream->period_size >> 1);
216                 set_dma_addr0(stream->dma, stream->buffer->next->start);
217                 set_dma_count0(stream->dma, stream->period_size >> 1);
218         }
219         enable_dma_buffers(stream->dma);
220         start_dma(stream->dma);
221 }
222
223 static irqreturn_t
224 au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
225 {
226         audio_stream_t *stream = (audio_stream_t *) dev_id;
227         snd_pcm_substream_t *substream = stream->substream;
228
229         spin_lock(&stream->dma_lock);
230         switch (get_dma_buffer_done(stream->dma)) {
231         case DMA_D0:
232                 stream->buffer = stream->buffer->next;
233                 clear_dma_done0(stream->dma);
234                 set_dma_addr0(stream->dma, stream->buffer->next->start);
235                 set_dma_count0(stream->dma, stream->period_size >> 1);
236                 enable_dma_buffer0(stream->dma);
237                 break;
238         case DMA_D1:
239                 stream->buffer = stream->buffer->next;
240                 clear_dma_done1(stream->dma);
241                 set_dma_addr1(stream->dma, stream->buffer->next->start);
242                 set_dma_count1(stream->dma, stream->period_size >> 1);
243                 enable_dma_buffer1(stream->dma);
244                 break;
245         case (DMA_D0 | DMA_D1):
246                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
247                 au1000_dma_stop(stream);
248                 au1000_dma_start(stream);
249                 break;
250         case (~DMA_D0 & ~DMA_D1):
251                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
252         }
253         spin_unlock(&stream->dma_lock);
254         snd_pcm_period_elapsed(substream);
255         return IRQ_HANDLED;
256 }
257
258 /*-------------------------- PCM Audio Streams -------------------------------*/
259
260 static unsigned int rates[] = {8000, 11025, 16000, 22050};
261 static snd_pcm_hw_constraint_list_t hw_constraints_rates = {
262         .count  =  sizeof(rates) / sizeof(rates[0]),
263         .list   = rates,
264         .mask   = 0,
265 };
266
267 static snd_pcm_hardware_t snd_au1000_hw =
268 {
269         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
270                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
271         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
272         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
273                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
274         .rate_min               = 8000,
275         .rate_max               = 22050,
276         .channels_min           = 1,
277         .channels_max           = 2,
278         .buffer_bytes_max       = 128*1024,
279         .period_bytes_min       = 32,
280         .period_bytes_max       = 16*1024,
281         .periods_min            = 8,
282         .periods_max            = 255,
283         .fifo_size              = 16,
284 };
285
286 static int
287 snd_au1000_playback_open(snd_pcm_substream_t * substream)
288 {
289         au1000_t *au1000 = substream->pcm->private_data;
290
291         au1000->stream[PLAYBACK]->substream = substream;
292         au1000->stream[PLAYBACK]->buffer = NULL;
293         substream->private_data = au1000->stream[PLAYBACK];
294         substream->runtime->hw = snd_au1000_hw;
295         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
296                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
297 }
298
299 static int
300 snd_au1000_capture_open(snd_pcm_substream_t * substream)
301 {
302         au1000_t *au1000 = substream->pcm->private_data;
303
304         au1000->stream[CAPTURE]->substream = substream;
305         au1000->stream[CAPTURE]->buffer = NULL;
306         substream->private_data = au1000->stream[CAPTURE];
307         substream->runtime->hw = snd_au1000_hw;
308         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
309                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
310
311 }
312
313 static int
314 snd_au1000_playback_close(snd_pcm_substream_t * substream)
315 {
316         au1000_t *au1000 = substream->pcm->private_data;
317
318         au1000->stream[PLAYBACK]->substream = NULL;
319         return 0;
320 }
321
322 static int
323 snd_au1000_capture_close(snd_pcm_substream_t * substream)
324 {
325         au1000_t *au1000 = substream->pcm->private_data;
326
327         au1000->stream[CAPTURE]->substream = NULL;
328         return 0;
329 }
330
331 static int
332 snd_au1000_hw_params(snd_pcm_substream_t * substream,
333                                         snd_pcm_hw_params_t * hw_params)
334 {
335         audio_stream_t *stream = substream->private_data;
336         int err;
337
338         err = snd_pcm_lib_malloc_pages(substream,
339                                        params_buffer_bytes(hw_params));
340         if (err < 0)
341                 return err;
342         return au1000_setup_dma_link(stream,
343                                      params_period_bytes(hw_params),
344                                      params_periods(hw_params));
345 }
346
347 static int
348 snd_au1000_hw_free(snd_pcm_substream_t * substream)
349 {
350         audio_stream_t *stream = substream->private_data;
351         au1000_release_dma_link(stream);
352         return snd_pcm_lib_free_pages(substream);
353 }
354
355 static int
356 snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
357 {
358         au1000_t *au1000 = substream->pcm->private_data;
359         snd_pcm_runtime_t *runtime = substream->runtime;
360
361         if (runtime->channels == 1)
362                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
363         else
364                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
365         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
366         return 0;
367 }
368
369 static int
370 snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
371 {
372         au1000_t *au1000 = substream->pcm->private_data;
373         snd_pcm_runtime_t *runtime = substream->runtime;
374
375         if (runtime->channels == 1)
376                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
377         else
378                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
379         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
380         return 0;
381 }
382
383 static int
384 snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
385 {
386         audio_stream_t *stream = substream->private_data;
387         int err = 0;
388
389         spin_lock(&stream->dma_lock);
390         switch (cmd) {
391         case SNDRV_PCM_TRIGGER_START:
392                 au1000_dma_start(stream);
393                 break;
394         case SNDRV_PCM_TRIGGER_STOP:
395                 au1000_dma_stop(stream);
396                 break;
397         default:
398                 err = -EINVAL;
399                 break;
400         }
401         spin_unlock(&stream->dma_lock);
402         return err;
403 }
404
405 static snd_pcm_uframes_t
406 snd_au1000_pointer(snd_pcm_substream_t * substream)
407 {
408         audio_stream_t *stream = substream->private_data;
409         snd_pcm_runtime_t *runtime = substream->runtime;
410         long location;
411
412         spin_lock(&stream->dma_lock);
413         location = get_dma_residue(stream->dma);
414         spin_unlock(&stream->dma_lock);
415         location = stream->buffer->relative_end - location;
416         if (location == -1)
417                 location = 0;
418         return bytes_to_frames(runtime,location);
419 }
420
421 static snd_pcm_ops_t snd_card_au1000_playback_ops = {
422         .open                   = snd_au1000_playback_open,
423         .close                  = snd_au1000_playback_close,
424         .ioctl                  = snd_pcm_lib_ioctl,
425         .hw_params              = snd_au1000_hw_params,
426         .hw_free                = snd_au1000_hw_free,
427         .prepare                = snd_au1000_playback_prepare,
428         .trigger                = snd_au1000_trigger,
429         .pointer                = snd_au1000_pointer,
430 };
431
432 static snd_pcm_ops_t snd_card_au1000_capture_ops = {
433         .open                   = snd_au1000_capture_open,
434         .close                  = snd_au1000_capture_close,
435         .ioctl                  = snd_pcm_lib_ioctl,
436         .hw_params              = snd_au1000_hw_params,
437         .hw_free                = snd_au1000_hw_free,
438         .prepare                = snd_au1000_capture_prepare,
439         .trigger                = snd_au1000_trigger,
440         .pointer                = snd_au1000_pointer,
441 };
442
443 static int __devinit
444 snd_au1000_pcm_new(void)
445 {
446         snd_pcm_t *pcm;
447         int err;
448         unsigned long flags;
449
450         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
451                 return err;
452
453         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
454                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
455
456         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
457                 &snd_card_au1000_playback_ops);
458         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
459                 &snd_card_au1000_capture_ops);
460
461         pcm->private_data = au1000;
462         pcm->info_flags = 0;
463         strcpy(pcm->name, "Au1000 AC97 PCM");
464
465         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
466         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
467
468         flags = claim_dma_lock();
469         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
470                         "AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
471                         au1000->stream[PLAYBACK])) < 0) {
472                 release_dma_lock(flags);
473                 return -EBUSY;
474         }
475         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
476                         "AC97 RX", au1000_dma_interrupt, SA_INTERRUPT,
477                         au1000->stream[CAPTURE])) < 0){
478                 release_dma_lock(flags);
479                 return -EBUSY;
480         }
481         /* enable DMA coherency in read/write DMA channels */
482         set_dma_mode(au1000->stream[PLAYBACK]->dma,
483                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
484         set_dma_mode(au1000->stream[CAPTURE]->dma,
485                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
486         release_dma_lock(flags);
487         au1000->pcm = pcm;
488         return 0;
489 }
490
491
492 /*-------------------------- AC97 CODEC Control ------------------------------*/
493
494 static unsigned short
495 snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
496 {
497         au1000_t *au1000 = ac97->private_data;
498         u32 volatile cmd;
499         u16 volatile data;
500         int             i;
501
502         spin_lock(&au1000->ac97_lock);
503 /* would rather use the interupt than this polling but it works and I can't
504 get the interupt driven case to work efficiently */
505         for (i = 0; i < 0x5000; i++)
506                 if (!(au1000->ac97_ioport->status & AC97C_CP))
507                         break;
508         if (i == 0x5000)
509                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
510
511         cmd = (u32) reg & AC97C_INDEX_MASK;
512         cmd |= AC97C_READ;
513         au1000->ac97_ioport->cmd = cmd;
514
515         /* now wait for the data */
516         for (i = 0; i < 0x5000; i++)
517                 if (!(au1000->ac97_ioport->status & AC97C_CP))
518                         break;
519         if (i == 0x5000) {
520                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
521                 return 0;
522         }
523
524         data = au1000->ac97_ioport->cmd & 0xffff;
525         spin_unlock(&au1000->ac97_lock);
526
527         return data;
528
529 }
530
531
532 static void
533 snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
534 {
535         au1000_t *au1000 = ac97->private_data;
536         u32 cmd;
537         int i;
538
539         spin_lock(&au1000->ac97_lock);
540 /* would rather use the interupt than this polling but it works and I can't
541 get the interupt driven case to work efficiently */
542         for (i = 0; i < 0x5000; i++)
543                 if (!(au1000->ac97_ioport->status & AC97C_CP))
544                         break;
545         if (i == 0x5000)
546                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
547
548         cmd = (u32) reg & AC97C_INDEX_MASK;
549         cmd &= ~AC97C_READ;
550         cmd |= ((u32) val << AC97C_WD_BIT);
551         au1000->ac97_ioport->cmd = cmd;
552         spin_unlock(&au1000->ac97_lock);
553 }
554
555 static int __devinit
556 snd_au1000_ac97_new(au1000_t *au1000)
557 {
558         int err;
559         ac97_bus_t bus, *pbus;
560         ac97_t ac97;
561
562         if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
563                         sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
564                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
565                 return -EBUSY;
566         }
567         au1000->ac97_ioport = (au1000_ac97_reg_t *) au1000->ac97_res_port->start;
568
569         spin_lock_init(&au1000->ac97_lock);
570
571         /* configure pins for AC'97
572         TODO: move to board_setup.c */
573         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
574
575         /* Initialise Au1000's AC'97 Control Block */
576         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
577         udelay(10);
578         au1000->ac97_ioport->cntrl = AC97C_CE;
579         udelay(10);
580
581         /* Initialise External CODEC -- cold reset */
582         au1000->ac97_ioport->config = AC97C_RESET;
583         udelay(10);
584         au1000->ac97_ioport->config = 0x0;
585         mdelay(5);
586
587         /* Initialise AC97 middle-layer */
588         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
589                 return err;
590
591         memset(&ac97, 0, sizeof(ac97));
592         ac97.private_data = au1000;
593         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
594                 return err;
595
596         return 0;
597 }
598
599 /*------------------------------ Setup / Destroy ----------------------------*/
600
601 void
602 snd_au1000_free(snd_card_t *card)
603 {
604         au1000_t *au1000 = card->private_data;
605
606         if (au1000->ac97_res_port) {
607                 /* put internal AC97 block into reset */
608                 au1000->ac97_ioport->cntrl = AC97C_RS;
609                 au1000->ac97_ioport = NULL;
610                 release_and_free_resource(au1000->ac97_res_port);
611         }
612
613         if (au1000->stream[PLAYBACK]->dma >= 0)
614                 free_au1000_dma(au1000->stream[PLAYBACK]->dma);
615
616         if (au1000->stream[CAPTURE]->dma >= 0)
617                 free_au1000_dma(au1000->stream[CAPTURE]->dma);
618
619         kfree(au1000->stream[PLAYBACK]);
620         kfree(au1000->stream[CAPTURE]);
621 }
622
623
624 static snd_card_t *au1000_card;
625
626 static int __init
627 au1000_init(void)
628 {
629         int err;
630         snd_card_t *card;
631         au1000_t *au1000;
632
633         card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
634         if (card == NULL)
635                 return -ENOMEM;
636
637         card->private_free = snd_au1000_free;
638         au1000 = card->private_data;
639         /* so that snd_au1000_free will work as intended */
640         au1000->card = card;
641         au1000->stream[PLAYBACK]->dma = -1;
642         au1000->stream[CAPTURE]->dma = -1;
643         au1000->ac97_res_port = NULL;
644         au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
645         au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
646         if (au1000->stream[PLAYBACK] == NULL ||
647             au1000->stream[CAPTURE] == NULL) {
648                 snd_card_free(card);
649                 return -ENOMEM;
650         }
651
652         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
653                 snd_card_free(card);
654                 return err;
655         }
656
657         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
658                 snd_card_free(card);
659                 return err;
660         }
661
662         strcpy(card->driver, "Au1000-AC97");
663         strcpy(card->shortname, "AMD Au1000-AC97");
664         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
665
666         if ((err = snd_card_set_generic_dev(card)) < 0) {
667                 snd_card_free(card);
668                 return err;
669         }
670
671         if ((err = snd_card_register(card)) < 0) {
672                 snd_card_free(card);
673                 return err;
674         }
675
676         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
677         au1000_card = card;
678         return 0;
679 }
680
681 static void __exit au1000_exit(void)
682 {
683         snd_card_free(au1000_card);
684 }
685
686 module_init(au1000_init);
687 module_exit(au1000_exit);
688