sound/pci/ac97/ak4531_codec.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   3  *  Universal routines for AK4531 codec
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/delay.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <sound/core.h>
  27 #include <sound/ak4531_codec.h>
  28
  29 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  30 MODULE_DESCRIPTION("Universal routines for AK4531 codec");
  31 MODULE_LICENSE("GPL");
  32
  33 static void snd_ak4531_proc_init(snd_card_t * card, ak4531_t * ak4531);
  34
  35 /*
  36  *
  37  */
  38
  39 #if 0
  40
  41 static void snd_ak4531_dump(ak4531_t *ak4531)
  42 {
  43         int idx;
  44
  45         for (idx = 0; idx < 0x19; idx++)
  46                 printk("ak4531 0x%x: 0x%x\n", idx, ak4531->regs[idx]);
  47 }
  48
  49 #endif
  50
  51 /*
  52  *
  53  */
  54
  55 #define AK4531_SINGLE(xname, xindex, reg, shift, mask, invert) \
  56 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  57   .info = snd_ak4531_info_single, \
  58   .get = snd_ak4531_get_single, .put = snd_ak4531_put_single, \
  59   .private_value = reg | (shift << 16) | (mask << 24) | (invert << 22) }
  60
  61 static int snd_ak4531_info_single(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
  62 {
  63         int mask = (kcontrol->private_value >> 24) & 0xff;
  64
  65         uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
  66         uinfo->count = 1;
  67         uinfo->value.integer.min = 0;
  68         uinfo->value.integer.max = mask;
  69         return 0;
  70 }
  71
  72 static int snd_ak4531_get_single(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
  73 {
  74         ak4531_t *ak4531 = snd_kcontrol_chip(kcontrol);
  75         unsigned long flags;
  76         int reg = kcontrol->private_value & 0xff;
  77         int shift = (kcontrol->private_value >> 16) & 0x07;
  78         int mask = (kcontrol->private_value >> 24) & 0xff;
  79         int invert = (kcontrol->private_value >> 22) & 1;
  80         int val;
  81
  82         spin_lock_irqsave(&ak4531->reg_lock, flags);
  83         val = (ak4531->regs[reg] >> shift) & mask;
  84         spin_unlock_irqrestore(&ak4531->reg_lock, flags);
  85         if (invert) {
  86                 val = mask - val;
  87         }
  88         ucontrol->value.integer.value[0] = val;
  89         return 0;
  90 }
  91
  92 static int snd_ak4531_put_single(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
  93 {
  94         ak4531_t *ak4531 = snd_kcontrol_chip(kcontrol);
  95         unsigned long flags;
  96         int reg = kcontrol->private_value & 0xff;
  97         int shift = (kcontrol->private_value >> 16) & 0x07;
  98         int mask = (kcontrol->private_value >> 24) & 0xff;
  99         int invert = (kcontrol->private_value >> 22) & 1;
 100         int change;
 101         int val;
 102
 103         val = ucontrol->value.integer.value[0] & mask;
 104         if (invert) {
 105                 val = mask - val;
 106         }
 107         val <<= shift;
 108         spin_lock_irqsave(&ak4531->reg_lock, flags);
 109         val = (ak4531->regs[reg] & ~(mask << shift)) | val;
 110         change = val != ak4531->regs[reg];
 111         ak4531->write(ak4531, reg, ak4531->regs[reg] = val);
 112         spin_unlock_irqrestore(&ak4531->reg_lock, flags);
 113         return change;
 114 }
 115
 116 #define AK4531_DOUBLE(xname, xindex, left_reg, right_reg, left_shift, right_shift, mask, invert) \
 117 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 118   .info = snd_ak4531_info_double, \
 119   .get = snd_ak4531_get_double, .put = snd_ak4531_put_double, \
 120   .private_value = left_reg | (right_reg << 8) | (left_shift << 16) | (right_shift << 19) | (mask << 24) | (invert << 22) }
 121
 122 static int snd_ak4531_info_double(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 123 {
 124         int mask = (kcontrol->private_value >> 24) & 0xff;
 125
 126         uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
 127         uinfo->count = 2;
 128         uinfo->value.integer.min = 0;
 129         uinfo->value.integer.max = mask;
 130         return 0;
 131 }
 132
 133 static int snd_ak4531_get_double(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 134 {
 135         ak4531_t *ak4531 = snd_kcontrol_chip(kcontrol);
 136         unsigned long flags;
 137         int left_reg = kcontrol->private_value & 0xff;
 138         int right_reg = (kcontrol->private_value >> 8) & 0xff;
 139         int left_shift = (kcontrol->private_value >> 16) & 0x07;
 140         int right_shift = (kcontrol->private_value >> 19) & 0x07;
 141         int mask = (kcontrol->private_value >> 24) & 0xff;
 142         int invert = (kcontrol->private_value >> 22) & 1;
 143         int left, right;
 144
 145         spin_lock_irqsave(&ak4531->reg_lock, flags);
 146         left = (ak4531->regs[left_reg] >> left_shift) & mask;
 147         right = (ak4531->regs[right_reg] >> right_shift) & mask;
 148         spin_unlock_irqrestore(&ak4531->reg_lock, flags);
 149         if (invert) {
 150                 left = mask - left;
 151                 right = mask - right;
 152         }
 153         ucontrol->value.integer.value[0] = left;
 154         ucontrol->value.integer.value[1] = right;
 155         return 0;
 156 }
 157
 158 static int snd_ak4531_put_double(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 159 {
 160         ak4531_t *ak4531 = snd_kcontrol_chip(kcontrol);
 161         unsigned long flags;
 162         int left_reg = kcontrol->private_value & 0xff;
 163         int right_reg = (kcontrol->private_value >> 8) & 0xff;
 164         int left_shift = (kcontrol->private_value >> 16) & 0x07;
 165         int right_shift = (kcontrol->private_value >> 19) & 0x07;
 166         int mask = (kcontrol->private_value >> 24) & 0xff;
 167         int invert = (kcontrol->private_value >> 22) & 1;
 168         int change;
 169         int left, right;
 170
 171         left = ucontrol->value.integer.value[0] & mask;
 172         right = ucontrol->value.integer.value[1] & mask;
 173         if (invert) {
 174                 left = mask - left;
 175                 right = mask - right;
 176         }
 177         left <<= left_shift;
 178         right <<= right_shift;
 179         spin_lock_irqsave(&ak4531->reg_lock, flags);
 180         if (left_reg == right_reg) {
 181                 left = (ak4531->regs[left_reg] & ~((mask << left_shift) | (mask << right_shift))) | left | right;
 182                 change = left != ak4531->regs[left_reg];
 183                 ak4531->write(ak4531, left_reg, ak4531->regs[left_reg] = left);
 184         } else {
 185                 left = (ak4531->regs[left_reg] & ~(mask << left_shift)) | left;
 186                 right = (ak4531->regs[right_reg] & ~(mask << right_shift)) | right;
 187                 change = left != ak4531->regs[left_reg] || right != ak4531->regs[right_reg];
 188                 ak4531->write(ak4531, left_reg, ak4531->regs[left_reg] = left);
 189                 ak4531->write(ak4531, right_reg, ak4531->regs[right_reg] = right);
 190         }
 191         spin_unlock_irqrestore(&ak4531->reg_lock, flags);
 192         return change;
 193 }
 194
 195 #define AK4531_INPUT_SW(xname, xindex, reg1, reg2, left_shift, right_shift) \
 196 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 197   .info = snd_ak4531_info_input_sw, \
 198   .get = snd_ak4531_get_input_sw, .put = snd_ak4531_put_input_sw, \
 199   .private_value = reg1 | (reg2 << 8) | (left_shift << 16) | (right_shift << 24) }
 200
 201 static int snd_ak4531_info_input_sw(snd_kcontrol_t * kcontrol, snd_ctl_elem_info_t * uinfo)
 202 {
 203         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 204         uinfo->count = 4;
 205         uinfo->value.integer.min = 0;
 206         uinfo->value.integer.max = 1;
 207         return 0;
 208 }
 209
 210 static int snd_ak4531_get_input_sw(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 211 {
 212         ak4531_t *ak4531 = snd_kcontrol_chip(kcontrol);
 213         unsigned long flags;
 214         int reg1 = kcontrol->private_value & 0xff;
 215         int reg2 = (kcontrol->private_value >> 8) & 0xff;
 216         int left_shift = (kcontrol->private_value >> 16) & 0x0f;
 217         int right_shift = (kcontrol->private_value >> 24) & 0x0f;
 218
 219         spin_lock_irqsave(&ak4531->reg_lock, flags);
 220         ucontrol->value.integer.value[0] = (ak4531->regs[reg1] >> left_shift) & 1;
 221         ucontrol->value.integer.value[1] = (ak4531->regs[reg2] >> left_shift) & 1;
 222         ucontrol->value.integer.value[2] = (ak4531->regs[reg1] >> right_shift) & 1;
 223         ucontrol->value.integer.value[3] = (ak4531->regs[reg2] >> right_shift) & 1;
 224         spin_unlock_irqrestore(&ak4531->reg_lock, flags);
 225         return 0;
 226 }
 227
 228 static int snd_ak4531_put_input_sw(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 229 {
 230         ak4531_t *ak4531 = snd_kcontrol_chip(kcontrol);
 231         unsigned long flags;
 232         int reg1 = kcontrol->private_value & 0xff;
 233         int reg2 = (kcontrol->private_value >> 8) & 0xff;
 234         int left_shift = (kcontrol->private_value >> 16) & 0x0f;
 235         int right_shift = (kcontrol->private_value >> 24) & 0x0f;
 236         int change;
 237         int val1, val2;
 238
 239         spin_lock_irqsave(&ak4531->reg_lock, flags);
 240         val1 = ak4531->regs[reg1] & ~((1 << left_shift) | (1 << right_shift));
 241         val2 = ak4531->regs[reg2] & ~((1 << left_shift) | (1 << right_shift));
 242         val1 |= (ucontrol->value.integer.value[0] & 1) << left_shift;
 243         val2 |= (ucontrol->value.integer.value[1] & 1) << left_shift;
 244         val1 |= (ucontrol->value.integer.value[2] & 1) << right_shift;
 245         val2 |= (ucontrol->value.integer.value[3] & 1) << right_shift;
 246         change = val1 != ak4531->regs[reg1] || val2 != ak4531->regs[reg2];
 247         ak4531->write(ak4531, reg1, ak4531->regs[reg1] = val1);
 248         ak4531->write(ak4531, reg2, ak4531->regs[reg2] = val2);
 249         spin_unlock_irqrestore(&ak4531->reg_lock, flags);
 250         return change;
 251 }
 252
 253 static snd_kcontrol_new_t snd_ak4531_controls[] = {
 254
 255 AK4531_DOUBLE("Master Playback Switch", 0, AK4531_LMASTER, AK4531_RMASTER, 7, 7, 1, 1),
 256 AK4531_DOUBLE("Master Playback Volume", 0, AK4531_LMASTER, AK4531_RMASTER, 0, 0, 0x1f, 1),
 257
 258 AK4531_SINGLE("Master Mono Playback Switch", 0, AK4531_MONO_OUT, 7, 1, 1),
 259 AK4531_SINGLE("Master Mono Playback Volume", 0, AK4531_MONO_OUT, 0, 0x07, 1),
 260
 261 AK4531_DOUBLE("PCM Switch", 0, AK4531_LVOICE, AK4531_RVOICE, 7, 7, 1, 1),
 262 AK4531_DOUBLE("PCM Volume", 0, AK4531_LVOICE, AK4531_RVOICE, 0, 0, 0x1f, 1),
 263 AK4531_DOUBLE("PCM Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 3, 2, 1, 0),
 264 AK4531_DOUBLE("PCM Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 2, 2, 1, 0),
 265
 266 AK4531_DOUBLE("PCM Switch", 1, AK4531_LFM, AK4531_RFM, 7, 7, 1, 1),
 267 AK4531_DOUBLE("PCM Volume", 1, AK4531_LFM, AK4531_RFM, 0, 0, 0x1f, 1),
 268 AK4531_DOUBLE("PCM Playback Switch", 1, AK4531_OUT_SW1, AK4531_OUT_SW1, 6, 5, 1, 0),
 269 AK4531_INPUT_SW("PCM Capture Route", 1, AK4531_LIN_SW1, AK4531_RIN_SW1, 6, 5),
 270
 271 AK4531_DOUBLE("CD Switch", 0, AK4531_LCD, AK4531_RCD, 7, 7, 1, 1),
 272 AK4531_DOUBLE("CD Volume", 0, AK4531_LCD, AK4531_RCD, 0, 0, 0x1f, 1),
 273 AK4531_DOUBLE("CD Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 2, 1, 1, 0),
 274 AK4531_INPUT_SW("CD Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 2, 1),
 275
 276 AK4531_DOUBLE("Line Switch", 0, AK4531_LLINE, AK4531_RLINE, 7, 7, 1, 1),
 277 AK4531_DOUBLE("Line Volume", 0, AK4531_LLINE, AK4531_RLINE, 0, 0, 0x1f, 1),
 278 AK4531_DOUBLE("Line Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 4, 3, 1, 0),
 279 AK4531_INPUT_SW("Line Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 4, 3),
 280
 281 AK4531_DOUBLE("Aux Switch", 0, AK4531_LAUXA, AK4531_RAUXA, 7, 7, 1, 1),
 282 AK4531_DOUBLE("Aux Volume", 0, AK4531_LAUXA, AK4531_RAUXA, 0, 0, 0x1f, 1),
 283 AK4531_DOUBLE("Aux Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 5, 4, 1, 0),
 284 AK4531_INPUT_SW("Aux Capture Route", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 4, 3),
 285
 286 AK4531_SINGLE("Mono Switch", 0, AK4531_MONO1, 7, 1, 1),
 287 AK4531_SINGLE("Mono Volume", 0, AK4531_MONO1, 0, 0x1f, 1),
 288 AK4531_SINGLE("Mono Playback Switch", 0, AK4531_OUT_SW2, 0, 1, 0),
 289 AK4531_DOUBLE("Mono Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 0, 0, 1, 0),
 290
 291 AK4531_SINGLE("Mono Switch", 1, AK4531_MONO2, 7, 1, 1),
 292 AK4531_SINGLE("Mono Volume", 1, AK4531_MONO2, 0, 0x1f, 1),
 293 AK4531_SINGLE("Mono Playback Switch", 1, AK4531_OUT_SW2, 1, 1, 0),
 294 AK4531_DOUBLE("Mono Capture Switch", 1, AK4531_LIN_SW2, AK4531_RIN_SW2, 1, 1, 1, 0),
 295
 296 AK4531_SINGLE("Mic Volume", 0, AK4531_MIC, 0, 0x1f, 1),
 297 AK4531_SINGLE("Mic Switch", 0, AK4531_MIC, 7, 1, 1),
 298 AK4531_SINGLE("Mic Playback Switch", 0, AK4531_OUT_SW1, 0, 1, 0),
 299 AK4531_DOUBLE("Mic Capture Switch", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 0, 0, 1, 0),
 300
 301 AK4531_DOUBLE("Mic Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 7, 7, 1, 0),
 302 AK4531_DOUBLE("Mono1 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 6, 6, 1, 0),
 303 AK4531_DOUBLE("Mono2 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 5, 5, 1, 0),
 304
 305 AK4531_SINGLE("AD Input Select", 0, AK4531_AD_IN, 0, 1, 0),
 306 AK4531_SINGLE("Mic Boost (+30dB)", 0, AK4531_MIC_GAIN, 0, 1, 0)
 307 };
 308
 309 static int snd_ak4531_free(ak4531_t *ak4531)
 310 {
 311         if (ak4531) {
 312                 if (ak4531->private_free)
 313                         ak4531->private_free(ak4531);
 314                 kfree(ak4531);
 315         }
 316         return 0;
 317 }
 318
 319 static int snd_ak4531_dev_free(snd_device_t *device)
 320 {
 321         ak4531_t *ak4531 = device->device_data;
 322         return snd_ak4531_free(ak4531);
 323 }
 324
 325 static u8 snd_ak4531_initial_map[0x19 + 1] = {
 326         0x9f,           /* 00: Master Volume Lch */
 327         0x9f,           /* 01: Master Volume Rch */
 328         0x9f,           /* 02: Voice Volume Lch */
 329         0x9f,           /* 03: Voice Volume Rch */
 330         0x9f,           /* 04: FM Volume Lch */
 331         0x9f,           /* 05: FM Volume Rch */
 332         0x9f,           /* 06: CD Audio Volume Lch */
 333         0x9f,           /* 07: CD Audio Volume Rch */
 334         0x9f,           /* 08: Line Volume Lch */
 335         0x9f,           /* 09: Line Volume Rch */
 336         0x9f,           /* 0a: Aux Volume Lch */
 337         0x9f,           /* 0b: Aux Volume Rch */
 338         0x9f,           /* 0c: Mono1 Volume */
 339         0x9f,           /* 0d: Mono2 Volume */
 340         0x9f,           /* 0e: Mic Volume */
 341         0x87,           /* 0f: Mono-out Volume */
 342         0x00,           /* 10: Output Mixer SW1 */
 343         0x00,           /* 11: Output Mixer SW2 */
 344         0x00,           /* 12: Lch Input Mixer SW1 */
 345         0x00,           /* 13: Rch Input Mixer SW1 */
 346         0x00,           /* 14: Lch Input Mixer SW2 */
 347         0x00,           /* 15: Rch Input Mixer SW2 */
 348         0x00,           /* 16: Reset & Power Down */
 349         0x00,           /* 17: Clock Select */
 350         0x00,           /* 18: AD Input Select */
 351         0x01            /* 19: Mic Amp Setup */
 352 };
 353
 354 int snd_ak4531_mixer(snd_card_t * card, ak4531_t * _ak4531, ak4531_t ** rak4531)
 355 {
 356         unsigned int idx;
 357         int err;
 358         ak4531_t * ak4531;
 359         static snd_device_ops_t ops = {
 360                 .dev_free =     snd_ak4531_dev_free,
 361         };
 362
 363         snd_assert(rak4531 != NULL, return -EINVAL);
 364         *rak4531 = NULL;
 365         snd_assert(card != NULL && _ak4531 != NULL, return -EINVAL);
 366         ak4531 = kcalloc(1, sizeof(*ak4531), GFP_KERNEL);
 367         if (ak4531 == NULL)
 368                 return -ENOMEM;
 369         *ak4531 = *_ak4531;
 370         spin_lock_init(&ak4531->reg_lock);
 371         if ((err = snd_component_add(card, "AK4531")) < 0) {
 372                 snd_ak4531_free(ak4531);
 373                 return err;
 374         }
 375         strcpy(card->mixername, "Asahi Kasei AK4531");
 376         ak4531->write(ak4531, AK4531_RESET, 0x03);      /* no RST, PD */
 377         udelay(100);
 378         ak4531->write(ak4531, AK4531_CLOCK, 0x00);      /* CODEC ADC and CODEC DAC use {LR,B}CLK2 and run off LRCLK2 PLL */
 379         for (idx = 0; idx < 0x19; idx++) {
 380                 if (idx == AK4531_RESET || idx == AK4531_CLOCK)
 381                         continue;
 382                 ak4531->write(ak4531, idx, ak4531->regs[idx] = snd_ak4531_initial_map[idx]);    /* recording source is mixer */
 383         }
 384         for (idx = 0; idx < ARRAY_SIZE(snd_ak4531_controls); idx++) {
 385                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_ak4531_controls[idx], ak4531))) < 0) {
 386                         snd_ak4531_free(ak4531);
 387                         return err;
 388                 }
 389         }
 390         snd_ak4531_proc_init(card, ak4531);
 391         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, ak4531, &ops)) < 0) {
 392                 snd_ak4531_free(ak4531);
 393                 return err;
 394         }
 395
 396 #if 0
 397         snd_ak4531_dump(ak4531);
 398 #endif
 399         *rak4531 = ak4531;
 400         return 0;
 401 }
 402
 403 /*
 404
 405  */
 406
 407 static void snd_ak4531_proc_read(snd_info_entry_t *entry,
 408                                  snd_info_buffer_t * buffer)
 409 {
 410         ak4531_t *ak4531 = entry->private_data;
 411
 412         snd_iprintf(buffer, "Asahi Kasei AK4531\n\n");
 413         snd_iprintf(buffer, "Recording source   : %s\n"
 414                     "MIC gain           : %s\n",
 415                     ak4531->regs[AK4531_AD_IN] & 1 ? "external" : "mixer",
 416                     ak4531->regs[AK4531_MIC_GAIN] & 1 ? "+30dB" : "+0dB");
 417 }
 418
 419 static void snd_ak4531_proc_init(snd_card_t * card, ak4531_t * ak4531)
 420 {
 421         snd_info_entry_t *entry;
 422
 423         if (! snd_card_proc_new(card, "ak4531", &entry))
 424                 snd_info_set_text_ops(entry, ak4531, 1024, snd_ak4531_proc_read);
 425 }
 426
 427 EXPORT_SYMBOL(snd_ak4531_mixer);
 428
 429 /*
 430  *  INIT part
 431  */
 432
 433 static int __init alsa_ak4531_init(void)
 434 {
 435         return 0;
 436 }
 437
 438 static void __exit alsa_ak4531_exit(void)
 439 {
 440 }
 441
 442 module_init(alsa_ak4531_init)
 443 module_exit(alsa_ak4531_exit)