ALSA: ALS4000 driver work, step 2
[linux-2.6.git] / sound / pci / als4000.c
1 /*
2  *  card-als4000.c - driver for Avance Logic ALS4000 based soundcards.
3  *  Copyright (C) 2000 by Bart Hartgers <bart@etpmod.phys.tue.nl>,
4  *                        Jaroslav Kysela <perex@perex.cz>
5  *  Copyright (C) 2002, 2008 by Andreas Mohr <hw7oshyuv3001@sneakemail.com>
6  *
7  *  Framework borrowed from Massimo Piccioni's card-als100.c.
8  *
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  * NOTES
25  *
26  *  Since Avance does not provide any meaningful documentation, and I
27  *  bought an ALS4000 based soundcard, I was forced to base this driver
28  *  on reverse engineering.
29  *
30  *  Note: this is no longer true (thank you!):
31  *  pretty verbose chip docu (ALS4000a.PDF) can be found on the ALSA web site.
32  *  Page numbers stated anywhere below with the "SPECS_PAGE:" tag
33  *  refer to: ALS4000a.PDF specs Ver 1.0, May 28th, 1998.
34  *
35  *  The ALS4000 seems to be the PCI-cousin of the ALS100. It contains an
36  *  ALS100-like SB DSP/mixer, an OPL3 synth, a MPU401 and a gameport 
37  *  interface. These subsystems can be mapped into ISA io-port space, 
38  *  using the PCI-interface. In addition, the PCI-bit provides DMA and IRQ 
39  *  services to the subsystems.
40  * 
41  * While ALS4000 is very similar to a SoundBlaster, the differences in
42  * DMA and capturing require more changes to the SoundBlaster than
43  * desirable, so I made this separate driver.
44  * 
45  * The ALS4000 can do real full duplex playback/capture.
46  *
47  * FMDAC:
48  * - 0x4f -> port 0x14
49  * - port 0x15 |= 1
50  *
51  * Enable/disable 3D sound:
52  * - 0x50 -> port 0x14
53  * - change bit 6 (0x40) of port 0x15
54  *
55  * Set QSound:
56  * - 0xdb -> port 0x14
57  * - set port 0x15:
58  *   0x3e (mode 3), 0x3c (mode 2), 0x3a (mode 1), 0x38 (mode 0)
59  *
60  * Set KSound:
61  * - value -> some port 0x0c0d
62  *
63  * ToDo:
64  * - by default, don't enable legacy game and use PCI game I/O
65  * - power management? (card can do voice wakeup according to datasheet!!)
66  */
67
68 #include <asm/io.h>
69 #include <linux/init.h>
70 #include <linux/pci.h>
71 #include <linux/slab.h>
72 #include <linux/gameport.h>
73 #include <linux/moduleparam.h>
74 #include <linux/dma-mapping.h>
75 #include <sound/core.h>
76 #include <sound/pcm.h>
77 #include <sound/rawmidi.h>
78 #include <sound/mpu401.h>
79 #include <sound/opl3.h>
80 #include <sound/sb.h>
81 #include <sound/initval.h>
82
83 MODULE_AUTHOR("Bart Hartgers <bart@etpmod.phys.tue.nl>, Andreas Mohr");
84 MODULE_DESCRIPTION("Avance Logic ALS4000");
85 MODULE_LICENSE("GPL");
86 MODULE_SUPPORTED_DEVICE("{{Avance Logic,ALS4000}}");
87
88 #if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
89 #define SUPPORT_JOYSTICK 1
90 #endif
91
92 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
93 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
94 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;      /* Enable this card */
95 #ifdef SUPPORT_JOYSTICK
96 static int joystick_port[SNDRV_CARDS];
97 #endif
98
99 module_param_array(index, int, NULL, 0444);
100 MODULE_PARM_DESC(index, "Index value for ALS4000 soundcard.");
101 module_param_array(id, charp, NULL, 0444);
102 MODULE_PARM_DESC(id, "ID string for ALS4000 soundcard.");
103 module_param_array(enable, bool, NULL, 0444);
104 MODULE_PARM_DESC(enable, "Enable ALS4000 soundcard.");
105 #ifdef SUPPORT_JOYSTICK
106 module_param_array(joystick_port, int, NULL, 0444);
107 MODULE_PARM_DESC(joystick_port, "Joystick port address for ALS4000 soundcard. (0 = disabled)");
108 #endif
109
110 struct snd_card_als4000 {
111         /* most frequent access first */
112         unsigned long iobase;
113         struct pci_dev *pci;
114         struct snd_sb *chip;
115 #ifdef SUPPORT_JOYSTICK
116         struct gameport *gameport;
117 #endif
118 };
119
120 static struct pci_device_id snd_als4000_ids[] = {
121         { 0x4005, 0x4000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },   /* ALS4000 */
122         { 0, }
123 };
124
125 MODULE_DEVICE_TABLE(pci, snd_als4000_ids);
126
127 enum als4k_iobase_t {
128         /* IOx: B == Byte, W = Word, D = DWord; SPECS_PAGE: 37 */
129         ALS4K_IOD_00_AC97_ACCESS = 0x00,
130         ALS4K_IOW_04_AC97_READ = 0x04,
131         ALS4K_IOB_06_AC97_STATUS = 0x06,
132         ALS4K_IOB_07_IRQSTATUS = 0x07,
133         ALS4K_IOD_08_GCR_DATA = 0x08,
134         ALS4K_IOB_0C_GCR_INDEX = 0x0c,
135         ALS4K_IOB_0E_IRQTYPE_SB_CR1E_MPU = 0x0e,
136         ALS4K_IOB_10_ADLIB_ADDR0 = 0x10,
137         ALS4K_IOB_11_ADLIB_ADDR1 = 0x11,
138         ALS4K_IOB_12_ADLIB_ADDR2 = 0x12,
139         ALS4K_IOB_13_ADLIB_ADDR3 = 0x13,
140         ALS4K_IOB_14_MIXER_INDEX = 0x14,
141         ALS4K_IOB_15_MIXER_DATA = 0x15,
142         ALS4K_IOB_16_ESP_RESET = 0x16,
143         ALS4K_IOB_16_ACK_FOR_CR1E = 0x16, /* 2nd function */
144         ALS4K_IOB_18_OPL_ADDR0 = 0x18,
145         ALS4K_IOB_19_OPL_ADDR1 = 0x19,
146         ALS4K_IOB_1A_ESP_RD_DATA = 0x1a,
147         ALS4K_IOB_1C_ESP_CMD_DATA = 0x1c,
148         ALS4K_IOB_1C_ESP_WR_STATUS = 0x1c, /* 2nd function */
149         ALS4K_IOB_1E_ESP_RD_STATUS8 = 0x1e,
150         ALS4K_IOB_1F_ESP_RD_STATUS16 = 0x1f,
151         ALS4K_IOB_20_ESP_GAMEPORT_200 = 0x20,
152         ALS4K_IOB_21_ESP_GAMEPORT_201 = 0x21,
153         ALS4K_IOB_30_MIDI_DATA = 0x30,
154         ALS4K_IOB_31_MIDI_STATUS = 0x31,
155         ALS4K_IOB_31_MIDI_COMMAND = 0x31, /* 2nd function */
156 };
157
158 enum als4k_iobase_0e_t {
159         ALS4K_IOB_0E_MPU_IRQ = 0x10,
160         ALS4K_IOB_0E_CR1E_IRQ = 0x40,
161         ALS4K_IOB_0E_SB_DMA_IRQ = 0x80,
162 };
163
164 enum als4k_gcr_t { /* all registers 32bit wide; SPECS_PAGE: 38 to 42 */
165         ALS4K_GCR8C_MISC_CTRL = 0x8c,
166         ALS4K_GCR90_TEST_MODE_REG = 0x90,
167         ALS4K_GCR91_DMA0_ADDR = 0x91,
168         ALS4K_GCR92_DMA0_MODE_COUNT = 0x92,
169         ALS4K_GCR93_DMA1_ADDR = 0x93,
170         ALS4K_GCR94_DMA1_MODE_COUNT = 0x94,
171         ALS4K_GCR95_DMA3_ADDR = 0x95,
172         ALS4K_GCR96_DMA3_MODE_COUNT = 0x96,
173         ALS4K_GCR99_DMA_EMULATION_CTRL = 0x99,
174         ALS4K_GCRA0_FIFO1_CURRENT_ADDR = 0xa0,
175         ALS4K_GCRA1_FIFO1_STATUS_BYTECOUNT = 0xa1,
176         ALS4K_GCRA2_FIFO2_PCIADDR = 0xa2,
177         ALS4K_GCRA3_FIFO2_COUNT = 0xa3,
178         ALS4K_GCRA4_FIFO2_CURRENT_ADDR = 0xa4,
179         ALS4K_GCRA5_FIFO1_STATUS_BYTECOUNT = 0xa5,
180         ALS4K_GCRA6_PM_CTRL = 0xa6,
181         ALS4K_GCRA7_PCI_ACCESS_STORAGE = 0xa7,
182         ALS4K_GCRA8_LEGACY_CFG1 = 0xa8,
183         ALS4K_GCRA9_LEGACY_CFG2 = 0xa9,
184         ALS4K_GCRFF_DUMMY_SCRATCH = 0xff,
185 };
186
187 enum als4k_gcr8c_t {
188         ALS4K_GCR8C_IRQ_MASK_CTRL_ENABLE = 0x8000,
189         ALS4K_GCR8C_CHIP_REV_MASK = 0xf0000
190 };
191
192 static inline void snd_als4k_iobase_writeb(unsigned long iobase,
193                                                 enum als4k_iobase_t reg,
194                                                 u8 val)
195 {
196         outb(val, iobase + reg);
197 }
198
199 static inline void snd_als4k_iobase_writel(unsigned long iobase,
200                                                 enum als4k_iobase_t reg,
201                                                 u32 val)
202 {
203         outl(val, iobase + reg);
204 }
205
206 static inline u8 snd_als4k_iobase_readb(unsigned long iobase,
207                                                 enum als4k_iobase_t reg)
208 {
209         return inb(iobase + reg);
210 }
211
212 static inline u32 snd_als4k_iobase_readl(unsigned long iobase,
213                                                 enum als4k_iobase_t reg)
214 {
215         return inl(iobase + reg);
216 }
217
218 static inline void snd_als4k_gcr_write_addr(unsigned long iobase,
219                                                  enum als4k_gcr_t reg,
220                                                  u32 val)
221 {
222         snd_als4k_iobase_writeb(iobase, ALS4K_IOB_0C_GCR_INDEX, reg);
223         snd_als4k_iobase_writel(iobase, ALS4K_IOD_08_GCR_DATA, val);
224 }
225
226 static inline void snd_als4k_gcr_write(struct snd_sb *sb,
227                                          enum als4k_gcr_t reg,
228                                          u32 val)
229 {
230         snd_als4k_gcr_write_addr(sb->alt_port, reg, val);
231 }       
232
233 static inline u32 snd_als4k_gcr_read_addr(unsigned long iobase,
234                                                  enum als4k_gcr_t reg)
235 {
236         /* SPECS_PAGE: 37/38 */
237         snd_als4k_iobase_writeb(iobase, ALS4K_IOB_0C_GCR_INDEX, reg);
238         return snd_als4k_iobase_readl(iobase, ALS4K_IOD_08_GCR_DATA);
239 }
240
241 static inline u32 snd_als4k_gcr_read(struct snd_sb *sb, enum als4k_gcr_t reg)
242 {
243         return snd_als4k_gcr_read_addr(sb->alt_port, reg);
244 }
245
246 enum als4k_cr_t { /* all registers 8bit wide; SPECS_PAGE: 20 to 23 */
247         ALS4K_CR0_SB_CONFIG = 0x00,
248         ALS4K_CR2_MISC_CONTROL = 0x02,
249         ALS4K_CR3_CONFIGURATION = 0x03,
250         ALS4K_CR17_FIFO_STATUS = 0x17,
251         ALS4K_CR18_ESP_MAJOR_VERSION = 0x18,
252         ALS4K_CR19_ESP_MINOR_VERSION = 0x19,
253         ALS4K_CR1A_MPU401_UART_MODE_CONTROL = 0x1a,
254         ALS4K_CR1C_FIFO2_BLOCK_LENGTH_LO = 0x1c,
255         ALS4K_CR1D_FIFO2_BLOCK_LENGTH_HI = 0x1d,
256         ALS4K_CR1E_FIFO2_CONTROL = 0x1e, /* secondary PCM FIFO (recording) */
257         ALS4K_CR3A_MISC_CONTROL = 0x3a,
258         ALS4K_CR3B_CRC32_BYTE0 = 0x3b, /* for testing, activate via CR3A */
259         ALS4K_CR3C_CRC32_BYTE1 = 0x3c,
260         ALS4K_CR3D_CRC32_BYTE2 = 0x3d,
261         ALS4K_CR3E_CRC32_BYTE3 = 0x3e,
262 };
263
264 enum als4k_cr0_t {
265         ALS4K_CR0_DMA_CONTIN_MODE_CTRL = 0x02, /* IRQ/FIFO controlled for 0/1 */
266         ALS4K_CR0_DMA_90H_MODE_CTRL = 0x04, /* IRQ/FIFO controlled for 0/1 */
267         ALS4K_CR0_MX80_81_REG_WRITE_ENABLE = 0x80,
268 };
269
270 static inline void snd_als4_cr_write(struct snd_sb *chip,
271                                         enum als4k_cr_t reg,
272                                         u8 data)
273 {
274         /* Control Register is reg | 0xc0 (bit 7, 6 set) on sbmixer_index
275          * NOTE: assumes chip->mixer_lock to be locked externally already!
276          * SPECS_PAGE: 6 */
277         snd_sbmixer_write(chip, reg | 0xc0, data);
278 }
279
280 static inline u8 snd_als4_cr_read(struct snd_sb *chip,
281                                         enum als4k_cr_t reg)
282 {
283         /* NOTE: assumes chip->mixer_lock to be locked externally already! */
284         return snd_sbmixer_read(chip, reg | 0xc0);
285 }
286
287
288
289 static void snd_als4000_set_rate(struct snd_sb *chip, unsigned int rate)
290 {
291         if (!(chip->mode & SB_RATE_LOCK)) {
292                 snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE_OUT);
293                 snd_sbdsp_command(chip, rate>>8);
294                 snd_sbdsp_command(chip, rate);
295         }
296 }
297
298 static inline void snd_als4000_set_capture_dma(struct snd_sb *chip,
299                                                dma_addr_t addr, unsigned size)
300 {
301         /* SPECS_PAGE: 40 */
302         snd_als4k_gcr_write(chip, ALS4K_GCRA2_FIFO2_PCIADDR, addr);
303         snd_als4k_gcr_write(chip, ALS4K_GCRA3_FIFO2_COUNT, (size-1));
304 }
305
306 static inline void snd_als4000_set_playback_dma(struct snd_sb *chip,
307                                                 dma_addr_t addr,
308                                                 unsigned size)
309 {
310         /* SPECS_PAGE: 38 */
311         snd_als4k_gcr_write(chip, ALS4K_GCR91_DMA0_ADDR, addr);
312         snd_als4k_gcr_write(chip, ALS4K_GCR92_DMA0_MODE_COUNT,
313                                                         (size-1)|0x180000);
314 }
315
316 #define ALS4000_FORMAT_SIGNED   (1<<0)
317 #define ALS4000_FORMAT_16BIT    (1<<1)
318 #define ALS4000_FORMAT_STEREO   (1<<2)
319
320 static int snd_als4000_get_format(struct snd_pcm_runtime *runtime)
321 {
322         int result;
323
324         result = 0;
325         if (snd_pcm_format_signed(runtime->format))
326                 result |= ALS4000_FORMAT_SIGNED;
327         if (snd_pcm_format_physical_width(runtime->format) == 16)
328                 result |= ALS4000_FORMAT_16BIT;
329         if (runtime->channels > 1)
330                 result |= ALS4000_FORMAT_STEREO;
331         return result;
332 }
333
334 /* structure for setting up playback */
335 static const struct {
336         unsigned char dsp_cmd, dma_on, dma_off, format;
337 } playback_cmd_vals[]={
338 /* ALS4000_FORMAT_U8_MONO */
339 { SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_UNS_MONO },
340 /* ALS4000_FORMAT_S8_MONO */    
341 { SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_SIGN_MONO },
342 /* ALS4000_FORMAT_U16L_MONO */
343 { SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_UNS_MONO },
344 /* ALS4000_FORMAT_S16L_MONO */
345 { SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_SIGN_MONO },
346 /* ALS4000_FORMAT_U8_STEREO */
347 { SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_UNS_STEREO },
348 /* ALS4000_FORMAT_S8_STEREO */  
349 { SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_SIGN_STEREO },
350 /* ALS4000_FORMAT_U16L_STEREO */
351 { SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_UNS_STEREO },
352 /* ALS4000_FORMAT_S16L_STEREO */
353 { SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_SIGN_STEREO },
354 };
355 #define playback_cmd(chip) (playback_cmd_vals[(chip)->playback_format])
356
357 /* structure for setting up capture */
358 enum { CMD_WIDTH8=0x04, CMD_SIGNED=0x10, CMD_MONO=0x80, CMD_STEREO=0xA0 };
359 static const unsigned char capture_cmd_vals[]=
360 {
361 CMD_WIDTH8|CMD_MONO,                    /* ALS4000_FORMAT_U8_MONO */
362 CMD_WIDTH8|CMD_SIGNED|CMD_MONO,         /* ALS4000_FORMAT_S8_MONO */    
363 CMD_MONO,                               /* ALS4000_FORMAT_U16L_MONO */
364 CMD_SIGNED|CMD_MONO,                    /* ALS4000_FORMAT_S16L_MONO */
365 CMD_WIDTH8|CMD_STEREO,                  /* ALS4000_FORMAT_U8_STEREO */
366 CMD_WIDTH8|CMD_SIGNED|CMD_STEREO,       /* ALS4000_FORMAT_S8_STEREO */  
367 CMD_STEREO,                             /* ALS4000_FORMAT_U16L_STEREO */
368 CMD_SIGNED|CMD_STEREO,                  /* ALS4000_FORMAT_S16L_STEREO */
369 };      
370 #define capture_cmd(chip) (capture_cmd_vals[(chip)->capture_format])
371
372 static int snd_als4000_hw_params(struct snd_pcm_substream *substream,
373                                  struct snd_pcm_hw_params *hw_params)
374 {
375         return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
376 }
377
378 static int snd_als4000_hw_free(struct snd_pcm_substream *substream)
379 {
380         snd_pcm_lib_free_pages(substream);
381         return 0;
382 }
383
384 static int snd_als4000_capture_prepare(struct snd_pcm_substream *substream)
385 {
386         struct snd_sb *chip = snd_pcm_substream_chip(substream);
387         struct snd_pcm_runtime *runtime = substream->runtime;
388         unsigned long size;
389         unsigned count;
390
391         chip->capture_format = snd_als4000_get_format(runtime);
392                 
393         size = snd_pcm_lib_buffer_bytes(substream);
394         count = snd_pcm_lib_period_bytes(substream);
395         
396         if (chip->capture_format & ALS4000_FORMAT_16BIT)
397                 count >>= 1;
398         count--;
399
400         spin_lock_irq(&chip->reg_lock);
401         snd_als4000_set_rate(chip, runtime->rate);
402         snd_als4000_set_capture_dma(chip, runtime->dma_addr, size);
403         spin_unlock_irq(&chip->reg_lock);
404         spin_lock_irq(&chip->mixer_lock);
405         snd_als4_cr_write(chip, ALS4K_CR1C_FIFO2_BLOCK_LENGTH_LO, count & 0xff);
406         snd_als4_cr_write(chip, ALS4K_CR1D_FIFO2_BLOCK_LENGTH_HI, count >> 8);
407         spin_unlock_irq(&chip->mixer_lock);
408         return 0;
409 }
410
411 static int snd_als4000_playback_prepare(struct snd_pcm_substream *substream)
412 {
413         struct snd_sb *chip = snd_pcm_substream_chip(substream);
414         struct snd_pcm_runtime *runtime = substream->runtime;
415         unsigned long size;
416         unsigned count;
417
418         chip->playback_format = snd_als4000_get_format(runtime);
419         
420         size = snd_pcm_lib_buffer_bytes(substream);
421         count = snd_pcm_lib_period_bytes(substream);
422         
423         if (chip->playback_format & ALS4000_FORMAT_16BIT)
424                 count >>= 1;
425         count--;
426         
427         /* FIXME: from second playback on, there's a lot more clicks and pops
428          * involved here than on first playback. Fiddling with
429          * tons of different settings didn't help (DMA, speaker on/off,
430          * reordering, ...). Something seems to get enabled on playback
431          * that I haven't found out how to disable again, which then causes
432          * the switching pops to reach the speakers the next time here. */
433         spin_lock_irq(&chip->reg_lock);
434         snd_als4000_set_rate(chip, runtime->rate);
435         snd_als4000_set_playback_dma(chip, runtime->dma_addr, size);
436         
437         /* SPEAKER_ON not needed, since dma_on seems to also enable speaker */
438         /* snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON); */
439         snd_sbdsp_command(chip, playback_cmd(chip).dsp_cmd);
440         snd_sbdsp_command(chip, playback_cmd(chip).format);
441         snd_sbdsp_command(chip, count & 0xff);
442         snd_sbdsp_command(chip, count >> 8);
443         snd_sbdsp_command(chip, playback_cmd(chip).dma_off);    
444         spin_unlock_irq(&chip->reg_lock);
445         
446         return 0;
447 }
448
449 static int snd_als4000_capture_trigger(struct snd_pcm_substream *substream, int cmd)
450 {
451         struct snd_sb *chip = snd_pcm_substream_chip(substream);
452         int result = 0;
453         
454         /* FIXME race condition in here!!!
455            chip->mode non-atomic update gets consistently protected
456            by reg_lock always, _except_ for this place!!
457            Probably need to take reg_lock as outer (or inner??) lock, too.
458            (or serialize both lock operations? probably not, though... - racy?)
459         */
460         spin_lock(&chip->mixer_lock);
461         switch (cmd) {
462         case SNDRV_PCM_TRIGGER_START:
463         case SNDRV_PCM_TRIGGER_RESUME:
464                 chip->mode |= SB_RATE_LOCK_CAPTURE;
465                 snd_als4_cr_write(chip, ALS4K_CR1E_FIFO2_CONTROL,
466                                                          capture_cmd(chip));
467                 break;
468         case SNDRV_PCM_TRIGGER_STOP:
469         case SNDRV_PCM_TRIGGER_SUSPEND:
470                 chip->mode &= ~SB_RATE_LOCK_CAPTURE;
471                 snd_als4_cr_write(chip, ALS4K_CR1E_FIFO2_CONTROL,
472                                                          capture_cmd(chip));
473                 break;
474         default:
475                 result = -EINVAL;
476                 break;
477         }
478         spin_unlock(&chip->mixer_lock);
479         return result;
480 }
481
482 static int snd_als4000_playback_trigger(struct snd_pcm_substream *substream, int cmd)
483 {
484         struct snd_sb *chip = snd_pcm_substream_chip(substream);
485         int result = 0;
486
487         spin_lock(&chip->reg_lock);
488         switch (cmd) {
489         case SNDRV_PCM_TRIGGER_START:
490         case SNDRV_PCM_TRIGGER_RESUME:
491                 chip->mode |= SB_RATE_LOCK_PLAYBACK;
492                 snd_sbdsp_command(chip, playback_cmd(chip).dma_on);
493                 break;
494         case SNDRV_PCM_TRIGGER_STOP:
495         case SNDRV_PCM_TRIGGER_SUSPEND:
496                 snd_sbdsp_command(chip, playback_cmd(chip).dma_off);
497                 chip->mode &= ~SB_RATE_LOCK_PLAYBACK;
498                 break;
499         default:
500                 result = -EINVAL;
501                 break;
502         }
503         spin_unlock(&chip->reg_lock);
504         return result;
505 }
506
507 static snd_pcm_uframes_t snd_als4000_capture_pointer(struct snd_pcm_substream *substream)
508 {
509         struct snd_sb *chip = snd_pcm_substream_chip(substream);
510         unsigned int result;
511
512         spin_lock(&chip->reg_lock);     
513         result = snd_als4k_gcr_read(chip, ALS4K_GCRA4_FIFO2_CURRENT_ADDR);
514         spin_unlock(&chip->reg_lock);
515         result &= 0xffff;
516         return bytes_to_frames( substream->runtime, result );
517 }
518
519 static snd_pcm_uframes_t snd_als4000_playback_pointer(struct snd_pcm_substream *substream)
520 {
521         struct snd_sb *chip = snd_pcm_substream_chip(substream);
522         unsigned result;
523
524         spin_lock(&chip->reg_lock);     
525         result = snd_als4k_gcr_read(chip, ALS4K_GCRA0_FIFO1_CURRENT_ADDR);
526         spin_unlock(&chip->reg_lock);
527         result &= 0xffff;
528         return bytes_to_frames( substream->runtime, result );
529 }
530
531 /* FIXME: this IRQ routine doesn't really support IRQ sharing (we always
532  * return IRQ_HANDLED no matter whether we actually had an IRQ flag or not).
533  * ALS4000a.PDF writes that while ACKing IRQ in PCI block will *not* ACK
534  * the IRQ in the SB core, ACKing IRQ in SB block *will* ACK the PCI IRQ
535  * register (alt_port + ALS4K_IOB_0E_IRQTYPE_SB_CR1E_MPU). Probably something
536  * could be optimized here to query/write one register only...
537  * And even if both registers need to be queried, then there's still the
538  * question of whether it's actually correct to ACK PCI IRQ before reading
539  * SB IRQ like we do now, since ALS4000a.PDF mentions that PCI IRQ will *clear*
540  * SB IRQ status.
541  * (hmm, SPECS_PAGE: 38 mentions it the other way around!)
542  * And do we *really* need the lock here for *reading* SB_DSP4_IRQSTATUS??
543  * */
544 static irqreturn_t snd_als4000_interrupt(int irq, void *dev_id)
545 {
546         struct snd_sb *chip = dev_id;
547         unsigned pci_irqstatus;
548         unsigned sb_irqstatus;
549
550         /* find out which bit of the ALS4000 PCI block produced the interrupt,
551            SPECS_PAGE: 38, 5 */
552         pci_irqstatus = snd_als4k_iobase_readb(chip->alt_port,
553                                  ALS4K_IOB_0E_IRQTYPE_SB_CR1E_MPU);
554         if ((pci_irqstatus & ALS4K_IOB_0E_SB_DMA_IRQ)
555          && (chip->playback_substream)) /* playback */
556                 snd_pcm_period_elapsed(chip->playback_substream);
557         if ((pci_irqstatus & ALS4K_IOB_0E_CR1E_IRQ)
558          && (chip->capture_substream)) /* capturing */
559                 snd_pcm_period_elapsed(chip->capture_substream);
560         if ((pci_irqstatus & ALS4K_IOB_0E_MPU_IRQ)
561          && (chip->rmidi)) /* MPU401 interrupt */
562                 snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);
563         /* ACK the PCI block IRQ */
564         snd_als4k_iobase_writeb(chip->alt_port,
565                          ALS4K_IOB_0E_IRQTYPE_SB_CR1E_MPU, pci_irqstatus);
566         
567         spin_lock(&chip->mixer_lock);
568         /* SPECS_PAGE: 20 */
569         sb_irqstatus = snd_sbmixer_read(chip, SB_DSP4_IRQSTATUS);
570         spin_unlock(&chip->mixer_lock);
571         
572         if (sb_irqstatus & SB_IRQTYPE_8BIT)
573                 snd_sb_ack_8bit(chip);
574         if (sb_irqstatus & SB_IRQTYPE_16BIT)
575                 snd_sb_ack_16bit(chip);
576         if (sb_irqstatus & SB_IRQTYPE_MPUIN)
577                 inb(chip->mpu_port);
578         if (sb_irqstatus & ALS4K_IRQTYPE_CR1E_DMA)
579                 snd_als4k_iobase_readb(chip->alt_port,
580                                         ALS4K_IOB_16_ACK_FOR_CR1E);
581
582         /* printk(KERN_INFO "als4000: irq 0x%04x 0x%04x\n",
583                                          pci_irqstatus, sb_irqstatus); */
584
585         /* only ack the things we actually handled above */
586         return IRQ_RETVAL(
587              (pci_irqstatus & (ALS4K_IOB_0E_SB_DMA_IRQ|ALS4K_IOB_0E_CR1E_IRQ|
588                                 ALS4K_IOB_0E_MPU_IRQ))
589           || (sb_irqstatus & (SB_IRQTYPE_8BIT|SB_IRQTYPE_16BIT|
590                                 SB_IRQTYPE_MPUIN|ALS4K_IRQTYPE_CR1E_DMA))
591         );
592 }
593
594 /*****************************************************************/
595
596 static struct snd_pcm_hardware snd_als4000_playback =
597 {
598         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
599                                  SNDRV_PCM_INFO_MMAP_VALID),
600         .formats =              SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
601                                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE,      /* formats */
602         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
603         .rate_min =             4000,
604         .rate_max =             48000,
605         .channels_min =         1,
606         .channels_max =         2,
607         .buffer_bytes_max =     65536,
608         .period_bytes_min =     64,
609         .period_bytes_max =     65536,
610         .periods_min =          1,
611         .periods_max =          1024,
612         .fifo_size =            0
613 };
614
615 static struct snd_pcm_hardware snd_als4000_capture =
616 {
617         .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
618                                  SNDRV_PCM_INFO_MMAP_VALID),
619         .formats =              SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
620                                 SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE,      /* formats */
621         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
622         .rate_min =             4000,
623         .rate_max =             48000,
624         .channels_min =         1,
625         .channels_max =         2,
626         .buffer_bytes_max =     65536,
627         .period_bytes_min =     64,
628         .period_bytes_max =     65536,
629         .periods_min =          1,
630         .periods_max =          1024,
631         .fifo_size =            0
632 };
633
634 /*****************************************************************/
635
636 static int snd_als4000_playback_open(struct snd_pcm_substream *substream)
637 {
638         struct snd_sb *chip = snd_pcm_substream_chip(substream);
639         struct snd_pcm_runtime *runtime = substream->runtime;
640
641         chip->playback_substream = substream;
642         runtime->hw = snd_als4000_playback;
643         return 0;
644 }
645
646 static int snd_als4000_playback_close(struct snd_pcm_substream *substream)
647 {
648         struct snd_sb *chip = snd_pcm_substream_chip(substream);
649
650         chip->playback_substream = NULL;
651         snd_pcm_lib_free_pages(substream);
652         return 0;
653 }
654
655 static int snd_als4000_capture_open(struct snd_pcm_substream *substream)
656 {
657         struct snd_sb *chip = snd_pcm_substream_chip(substream);
658         struct snd_pcm_runtime *runtime = substream->runtime;
659
660         chip->capture_substream = substream;
661         runtime->hw = snd_als4000_capture;
662         return 0;
663 }
664
665 static int snd_als4000_capture_close(struct snd_pcm_substream *substream)
666 {
667         struct snd_sb *chip = snd_pcm_substream_chip(substream);
668
669         chip->capture_substream = NULL;
670         snd_pcm_lib_free_pages(substream);
671         return 0;
672 }
673
674 /******************************************************************/
675
676 static struct snd_pcm_ops snd_als4000_playback_ops = {
677         .open =         snd_als4000_playback_open,
678         .close =        snd_als4000_playback_close,
679         .ioctl =        snd_pcm_lib_ioctl,
680         .hw_params =    snd_als4000_hw_params,
681         .hw_free =      snd_als4000_hw_free,
682         .prepare =      snd_als4000_playback_prepare,
683         .trigger =      snd_als4000_playback_trigger,
684         .pointer =      snd_als4000_playback_pointer
685 };
686
687 static struct snd_pcm_ops snd_als4000_capture_ops = {
688         .open =         snd_als4000_capture_open,
689         .close =        snd_als4000_capture_close,
690         .ioctl =        snd_pcm_lib_ioctl,
691         .hw_params =    snd_als4000_hw_params,
692         .hw_free =      snd_als4000_hw_free,
693         .prepare =      snd_als4000_capture_prepare,
694         .trigger =      snd_als4000_capture_trigger,
695         .pointer =      snd_als4000_capture_pointer
696 };
697
698 static int __devinit snd_als4000_pcm(struct snd_sb *chip, int device)
699 {
700         struct snd_pcm *pcm;
701         int err;
702
703         err = snd_pcm_new(chip->card, "ALS4000 DSP", device, 1, 1, &pcm);
704         if (err < 0)
705                 return err;
706         pcm->private_data = chip;
707         pcm->info_flags = SNDRV_PCM_INFO_JOINT_DUPLEX;
708         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_als4000_playback_ops);
709         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_als4000_capture_ops);
710
711         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
712                                               64*1024, 64*1024);
713
714         chip->pcm = pcm;
715
716         return 0;
717 }
718
719 /******************************************************************/
720
721 static void snd_als4000_set_addr(unsigned long iobase,
722                                         unsigned int sb_io,
723                                         unsigned int mpu_io,
724                                         unsigned int opl_io,
725                                         unsigned int game_io)
726 {
727         u32 cfg1 = 0;
728         u32 cfg2 = 0;
729
730         if (mpu_io > 0)
731                 cfg2 |= (mpu_io | 1) << 16;
732         if (sb_io > 0)
733                 cfg2 |= (sb_io | 1);
734         if (game_io > 0)
735                 cfg1 |= (game_io | 1) << 16;
736         if (opl_io > 0)
737                 cfg1 |= (opl_io | 1);
738         snd_als4k_gcr_write_addr(iobase, ALS4K_GCRA8_LEGACY_CFG1, cfg1);
739         snd_als4k_gcr_write_addr(iobase, ALS4K_GCRA9_LEGACY_CFG2, cfg2);
740 }
741
742 static void snd_als4000_configure(struct snd_sb *chip)
743 {
744         u8 tmp;
745         int i;
746
747         /* do some more configuration */
748         spin_lock_irq(&chip->mixer_lock);
749         tmp = snd_als4_cr_read(chip, ALS4K_CR0_SB_CONFIG);
750         snd_als4_cr_write(chip, ALS4K_CR0_SB_CONFIG,
751                                 tmp|ALS4K_CR0_MX80_81_REG_WRITE_ENABLE);
752         /* always select DMA channel 0, since we do not actually use DMA
753          * SPECS_PAGE: 19/20 */
754         snd_sbmixer_write(chip, SB_DSP4_DMASETUP, SB_DMASETUP_DMA0);
755         snd_als4_cr_write(chip, ALS4K_CR0_SB_CONFIG,
756                                  tmp & ~ALS4K_CR0_MX80_81_REG_WRITE_ENABLE);
757         spin_unlock_irq(&chip->mixer_lock);
758         
759         spin_lock_irq(&chip->reg_lock);
760         /* enable interrupts */
761         snd_als4k_gcr_write(chip, ALS4K_GCR8C_MISC_CTRL,
762                                         ALS4K_GCR8C_IRQ_MASK_CTRL_ENABLE);
763
764         /* SPECS_PAGE: 39 */
765         for (i = ALS4K_GCR91_DMA0_ADDR; i <= ALS4K_GCR96_DMA3_MODE_COUNT; ++i)
766                 snd_als4k_gcr_write(chip, i, 0);
767         
768         snd_als4k_gcr_write(chip, ALS4K_GCR99_DMA_EMULATION_CTRL,
769                 snd_als4k_gcr_read(chip, ALS4K_GCR99_DMA_EMULATION_CTRL));
770         spin_unlock_irq(&chip->reg_lock);
771 }
772
773 #ifdef SUPPORT_JOYSTICK
774 static int __devinit snd_als4000_create_gameport(struct snd_card_als4000 *acard, int dev)
775 {
776         struct gameport *gp;
777         struct resource *r;
778         int io_port;
779
780         if (joystick_port[dev] == 0)
781                 return -ENODEV;
782
783         if (joystick_port[dev] == 1) { /* auto-detect */
784                 for (io_port = 0x200; io_port <= 0x218; io_port += 8) {
785                         r = request_region(io_port, 8, "ALS4000 gameport");
786                         if (r)
787                                 break;
788                 }
789         } else {
790                 io_port = joystick_port[dev];
791                 r = request_region(io_port, 8, "ALS4000 gameport");
792         }
793
794         if (!r) {
795                 printk(KERN_WARNING "als4000: cannot reserve joystick ports\n");
796                 return -EBUSY;
797         }
798
799         acard->gameport = gp = gameport_allocate_port();
800         if (!gp) {
801                 printk(KERN_ERR "als4000: cannot allocate memory for gameport\n");
802                 release_and_free_resource(r);
803                 return -ENOMEM;
804         }
805
806         gameport_set_name(gp, "ALS4000 Gameport");
807         gameport_set_phys(gp, "pci%s/gameport0", pci_name(acard->pci));
808         gameport_set_dev_parent(gp, &acard->pci->dev);
809         gp->io = io_port;
810         gameport_set_port_data(gp, r);
811
812         /* Enable legacy joystick port */
813         snd_als4000_set_addr(acard->iobase, 0, 0, 0, 1);
814
815         gameport_register_port(acard->gameport);
816
817         return 0;
818 }
819
820 static void snd_als4000_free_gameport(struct snd_card_als4000 *acard)
821 {
822         if (acard->gameport) {
823                 struct resource *r = gameport_get_port_data(acard->gameport);
824
825                 gameport_unregister_port(acard->gameport);
826                 acard->gameport = NULL;
827
828                 /* disable joystick */
829                 snd_als4000_set_addr(acard->iobase, 0, 0, 0, 0);
830
831                 release_and_free_resource(r);
832         }
833 }
834 #else
835 static inline int snd_als4000_create_gameport(struct snd_card_als4000 *acard, int dev) { return -ENOSYS; }
836 static inline void snd_als4000_free_gameport(struct snd_card_als4000 *acard) { }
837 #endif
838
839 static void snd_card_als4000_free( struct snd_card *card )
840 {
841         struct snd_card_als4000 *acard = card->private_data;
842
843         /* make sure that interrupts are disabled */
844         snd_als4k_gcr_write_addr(acard->iobase, ALS4K_GCR8C_MISC_CTRL, 0);
845         /* free resources */
846         snd_als4000_free_gameport(acard);
847         pci_release_regions(acard->pci);
848         pci_disable_device(acard->pci);
849 }
850
851 static int __devinit snd_card_als4000_probe(struct pci_dev *pci,
852                                           const struct pci_device_id *pci_id)
853 {
854         static int dev;
855         struct snd_card *card;
856         struct snd_card_als4000 *acard;
857         unsigned long iobase;
858         struct snd_sb *chip;
859         struct snd_opl3 *opl3;
860         unsigned short word;
861         int err;
862
863         if (dev >= SNDRV_CARDS)
864                 return -ENODEV;
865         if (!enable[dev]) {
866                 dev++;
867                 return -ENOENT;
868         }
869
870         /* enable PCI device */
871         if ((err = pci_enable_device(pci)) < 0) {
872                 return err;
873         }
874         /* check, if we can restrict PCI DMA transfers to 24 bits */
875         if (pci_set_dma_mask(pci, DMA_24BIT_MASK) < 0 ||
876             pci_set_consistent_dma_mask(pci, DMA_24BIT_MASK) < 0) {
877                 snd_printk(KERN_ERR "architecture does not support 24bit PCI busmaster DMA\n");
878                 pci_disable_device(pci);
879                 return -ENXIO;
880         }
881
882         if ((err = pci_request_regions(pci, "ALS4000")) < 0) {
883                 pci_disable_device(pci);
884                 return err;
885         }
886         iobase = pci_resource_start(pci, 0);
887
888         pci_read_config_word(pci, PCI_COMMAND, &word);
889         pci_write_config_word(pci, PCI_COMMAND, word | PCI_COMMAND_IO);
890         pci_set_master(pci);
891         
892         card = snd_card_new(index[dev], id[dev], THIS_MODULE, 
893                             sizeof(*acard) /* private_data: acard */);
894         if (card == NULL) {
895                 pci_release_regions(pci);
896                 pci_disable_device(pci);
897                 return -ENOMEM;
898         }
899
900         acard = card->private_data;
901         acard->pci = pci;
902         acard->iobase = iobase;
903         card->private_free = snd_card_als4000_free;
904
905         /* disable all legacy ISA stuff */
906         snd_als4000_set_addr(acard->iobase, 0, 0, 0, 0);
907
908         if ((err = snd_sbdsp_create(card,
909                                     iobase + ALS4K_IOB_10_ADLIB_ADDR0,
910                                     pci->irq,
911                 /* internally registered as IRQF_SHARED in case of ALS4000 SB */
912                                     snd_als4000_interrupt,
913                                     -1,
914                                     -1,
915                                     SB_HW_ALS4000,
916                                     &chip)) < 0) {
917                 goto out_err;
918         }
919         acard->chip = chip;
920
921         chip->pci = pci;
922         chip->alt_port = iobase;
923         snd_card_set_dev(card, &pci->dev);
924
925         snd_als4000_configure(chip);
926
927         strcpy(card->driver, "ALS4000");
928         strcpy(card->shortname, "Avance Logic ALS4000");
929         sprintf(card->longname, "%s at 0x%lx, irq %i",
930                 card->shortname, chip->alt_port, chip->irq);
931
932         if ((err = snd_mpu401_uart_new( card, 0, MPU401_HW_ALS4000,
933                                         iobase + ALS4K_IOB_30_MIDI_DATA,
934                                         MPU401_INFO_INTEGRATED,
935                                         pci->irq, 0, &chip->rmidi)) < 0) {
936                 printk(KERN_ERR "als4000: no MPU-401 device at 0x%lx?\n",
937                                 iobase + ALS4K_IOB_30_MIDI_DATA);
938                 goto out_err;
939         }
940         /* FIXME: ALS4000 has interesting MPU401 configuration features
941          * at ALS4K_CR1A_MPU401_UART_MODE_CONTROL
942          * (pass-thru / UART switching, fast MIDI clock, etc.),
943          * however there doesn't seem to be an ALSA API for this...
944          * SPECS_PAGE: 21 */
945
946         if ((err = snd_als4000_pcm(chip, 0)) < 0) {
947                 goto out_err;
948         }
949         if ((err = snd_sbmixer_new(chip)) < 0) {
950                 goto out_err;
951         }           
952
953         if (snd_opl3_create(card,
954                                 iobase + ALS4K_IOB_10_ADLIB_ADDR0,
955                                 iobase + ALS4K_IOB_12_ADLIB_ADDR2,
956                             OPL3_HW_AUTO, 1, &opl3) < 0) {
957                 printk(KERN_ERR "als4000: no OPL device at 0x%lx-0x%lx?\n",
958                            iobase + ALS4K_IOB_10_ADLIB_ADDR0,
959                            iobase + ALS4K_IOB_12_ADLIB_ADDR2);
960         } else {
961                 if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
962                         goto out_err;
963                 }
964         }
965
966         snd_als4000_create_gameport(acard, dev);
967
968         if ((err = snd_card_register(card)) < 0) {
969                 goto out_err;
970         }
971         pci_set_drvdata(pci, card);
972         dev++;
973         err = 0;
974         goto out;
975
976 out_err:
977         snd_card_free(card);
978         
979 out:
980         return err;
981 }
982
983 static void __devexit snd_card_als4000_remove(struct pci_dev *pci)
984 {
985         snd_card_free(pci_get_drvdata(pci));
986         pci_set_drvdata(pci, NULL);
987 }
988
989 #ifdef CONFIG_PM
990 static int snd_als4000_suspend(struct pci_dev *pci, pm_message_t state)
991 {
992         struct snd_card *card = pci_get_drvdata(pci);
993         struct snd_card_als4000 *acard = card->private_data;
994         struct snd_sb *chip = acard->chip;
995
996         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
997         
998         snd_pcm_suspend_all(chip->pcm);
999         snd_sbmixer_suspend(chip);
1000
1001         pci_disable_device(pci);
1002         pci_save_state(pci);
1003         pci_set_power_state(pci, pci_choose_state(pci, state));
1004         return 0;
1005 }
1006
1007 static int snd_als4000_resume(struct pci_dev *pci)
1008 {
1009         struct snd_card *card = pci_get_drvdata(pci);
1010         struct snd_card_als4000 *acard = card->private_data;
1011         struct snd_sb *chip = acard->chip;
1012
1013         pci_set_power_state(pci, PCI_D0);
1014         pci_restore_state(pci);
1015         if (pci_enable_device(pci) < 0) {
1016                 printk(KERN_ERR "als4000: pci_enable_device failed, "
1017                        "disabling device\n");
1018                 snd_card_disconnect(card);
1019                 return -EIO;
1020         }
1021         pci_set_master(pci);
1022
1023         snd_als4000_configure(chip);
1024         snd_sbdsp_reset(chip);
1025         snd_sbmixer_resume(chip);
1026
1027 #ifdef SUPPORT_JOYSTICK
1028         if (acard->gameport)
1029                 snd_als4000_set_addr(acard->iobase, 0, 0, 0, 1);
1030 #endif
1031
1032         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1033         return 0;
1034 }
1035 #endif /* CONFIG_PM */
1036
1037
1038 static struct pci_driver driver = {
1039         .name = "ALS4000",
1040         .id_table = snd_als4000_ids,
1041         .probe = snd_card_als4000_probe,
1042         .remove = __devexit_p(snd_card_als4000_remove),
1043 #ifdef CONFIG_PM
1044         .suspend = snd_als4000_suspend,
1045         .resume = snd_als4000_resume,
1046 #endif
1047 };
1048
1049 static int __init alsa_card_als4000_init(void)
1050 {
1051         return pci_register_driver(&driver);
1052 }
1053
1054 static void __exit alsa_card_als4000_exit(void)
1055 {
1056         pci_unregister_driver(&driver);
1057 }
1058
1059 module_init(alsa_card_als4000_init)
1060 module_exit(alsa_card_als4000_exit)