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 #ifdef CONFIG_PROC_FS
  34 static void snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531);
  35 #else
  36 #define snd_ak4531_proc_init(card,ak)
  37 #endif
  38
  39 /*
  40  *
  41  */
  42
  43 #if 0
  44
  45 static void snd_ak4531_dump(struct snd_ak4531 *ak4531)
  46 {
  47         int idx;
  48
  49         for (idx = 0; idx < 0x19; idx++)
  50                 printk("ak4531 0x%x: 0x%x\n", idx, ak4531->regs[idx]);
  51 }
  52
  53 #endif
  54
  55 /*
  56  *
  57  */
  58
  59 #define AK4531_SINGLE(xname, xindex, reg, shift, mask, invert) \
  60 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  61   .info = snd_ak4531_info_single, \
  62   .get = snd_ak4531_get_single, .put = snd_ak4531_put_single, \
  63   .private_value = reg | (shift << 16) | (mask << 24) | (invert << 22) }
  64
  65 static int snd_ak4531_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
  66 {
  67         int mask = (kcontrol->private_value >> 24) & 0xff;
  68
  69         uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
  70         uinfo->count = 1;
  71         uinfo->value.integer.min = 0;
  72         uinfo->value.integer.max = mask;
  73         return 0;
  74 }
  75
  76 static int snd_ak4531_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  77 {
  78         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
  79         int reg = kcontrol->private_value & 0xff;
  80         int shift = (kcontrol->private_value >> 16) & 0x07;
  81         int mask = (kcontrol->private_value >> 24) & 0xff;
  82         int invert = (kcontrol->private_value >> 22) & 1;
  83         int val;
  84
  85         down(&ak4531->reg_mutex);
  86         val = (ak4531->regs[reg] >> shift) & mask;
  87         up(&ak4531->reg_mutex);
  88         if (invert) {
  89                 val = mask - val;
  90         }
  91         ucontrol->value.integer.value[0] = val;
  92         return 0;
  93 }
  94
  95 static int snd_ak4531_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  96 {
  97         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
  98         int reg = kcontrol->private_value & 0xff;
  99         int shift = (kcontrol->private_value >> 16) & 0x07;
 100         int mask = (kcontrol->private_value >> 24) & 0xff;
 101         int invert = (kcontrol->private_value >> 22) & 1;
 102         int change;
 103         int val;
 104
 105         val = ucontrol->value.integer.value[0] & mask;
 106         if (invert) {
 107                 val = mask - val;
 108         }
 109         val <<= shift;
 110         down(&ak4531->reg_mutex);
 111         val = (ak4531->regs[reg] & ~(mask << shift)) | val;
 112         change = val != ak4531->regs[reg];
 113         ak4531->write(ak4531, reg, ak4531->regs[reg] = val);
 114         up(&ak4531->reg_mutex);
 115         return change;
 116 }
 117
 118 #define AK4531_DOUBLE(xname, xindex, left_reg, right_reg, left_shift, right_shift, mask, invert) \
 119 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 120   .info = snd_ak4531_info_double, \
 121   .get = snd_ak4531_get_double, .put = snd_ak4531_put_double, \
 122   .private_value = left_reg | (right_reg << 8) | (left_shift << 16) | (right_shift << 19) | (mask << 24) | (invert << 22) }
 123
 124 static int snd_ak4531_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 125 {
 126         int mask = (kcontrol->private_value >> 24) & 0xff;
 127
 128         uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
 129         uinfo->count = 2;
 130         uinfo->value.integer.min = 0;
 131         uinfo->value.integer.max = mask;
 132         return 0;
 133 }
 134
 135 static int snd_ak4531_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 136 {
 137         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 138         int left_reg = kcontrol->private_value & 0xff;
 139         int right_reg = (kcontrol->private_value >> 8) & 0xff;
 140         int left_shift = (kcontrol->private_value >> 16) & 0x07;
 141         int right_shift = (kcontrol->private_value >> 19) & 0x07;
 142         int mask = (kcontrol->private_value >> 24) & 0xff;
 143         int invert = (kcontrol->private_value >> 22) & 1;
 144         int left, right;
 145
 146         down(&ak4531->reg_mutex);
 147         left = (ak4531->regs[left_reg] >> left_shift) & mask;
 148         right = (ak4531->regs[right_reg] >> right_shift) & mask;
 149         up(&ak4531->reg_mutex);
 150         if (invert) {
 151                 left = mask - left;
 152                 right = mask - right;
 153         }
 154         ucontrol->value.integer.value[0] = left;
 155         ucontrol->value.integer.value[1] = right;
 156         return 0;
 157 }
 158
 159 static int snd_ak4531_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 160 {
 161         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 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         down(&ak4531->reg_mutex);
 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         up(&ak4531->reg_mutex);
 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(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *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(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 211 {
 212         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 213         int reg1 = kcontrol->private_value & 0xff;
 214         int reg2 = (kcontrol->private_value >> 8) & 0xff;
 215         int left_shift = (kcontrol->private_value >> 16) & 0x0f;
 216         int right_shift = (kcontrol->private_value >> 24) & 0x0f;
 217
 218         down(&ak4531->reg_mutex);
 219         ucontrol->value.integer.value[0] = (ak4531->regs[reg1] >> left_shift) & 1;
 220         ucontrol->value.integer.value[1] = (ak4531->regs[reg2] >> left_shift) & 1;
 221         ucontrol->value.integer.value[2] = (ak4531->regs[reg1] >> right_shift) & 1;
 222         ucontrol->value.integer.value[3] = (ak4531->regs[reg2] >> right_shift) & 1;
 223         up(&ak4531->reg_mutex);
 224         return 0;
 225 }
 226
 227 static int snd_ak4531_put_input_sw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 228 {
 229         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 230         int reg1 = kcontrol->private_value & 0xff;
 231         int reg2 = (kcontrol->private_value >> 8) & 0xff;
 232         int left_shift = (kcontrol->private_value >> 16) & 0x0f;
 233         int right_shift = (kcontrol->private_value >> 24) & 0x0f;
 234         int change;
 235         int val1, val2;
 236
 237         down(&ak4531->reg_mutex);
 238         val1 = ak4531->regs[reg1] & ~((1 << left_shift) | (1 << right_shift));
 239         val2 = ak4531->regs[reg2] & ~((1 << left_shift) | (1 << right_shift));
 240         val1 |= (ucontrol->value.integer.value[0] & 1) << left_shift;
 241         val2 |= (ucontrol->value.integer.value[1] & 1) << left_shift;
 242         val1 |= (ucontrol->value.integer.value[2] & 1) << right_shift;
 243         val2 |= (ucontrol->value.integer.value[3] & 1) << right_shift;
 244         change = val1 != ak4531->regs[reg1] || val2 != ak4531->regs[reg2];
 245         ak4531->write(ak4531, reg1, ak4531->regs[reg1] = val1);
 246         ak4531->write(ak4531, reg2, ak4531->regs[reg2] = val2);
 247         up(&ak4531->reg_mutex);
 248         return change;
 249 }
 250
 251 static struct snd_kcontrol_new snd_ak4531_controls[] = {
 252
 253 AK4531_DOUBLE("Master Playback Switch", 0, AK4531_LMASTER, AK4531_RMASTER, 7, 7, 1, 1),
 254 AK4531_DOUBLE("Master Playback Volume", 0, AK4531_LMASTER, AK4531_RMASTER, 0, 0, 0x1f, 1),
 255
 256 AK4531_SINGLE("Master Mono Playback Switch", 0, AK4531_MONO_OUT, 7, 1, 1),
 257 AK4531_SINGLE("Master Mono Playback Volume", 0, AK4531_MONO_OUT, 0, 0x07, 1),
 258
 259 AK4531_DOUBLE("PCM Switch", 0, AK4531_LVOICE, AK4531_RVOICE, 7, 7, 1, 1),
 260 AK4531_DOUBLE("PCM Volume", 0, AK4531_LVOICE, AK4531_RVOICE, 0, 0, 0x1f, 1),
 261 AK4531_DOUBLE("PCM Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 3, 2, 1, 0),
 262 AK4531_DOUBLE("PCM Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 2, 2, 1, 0),
 263
 264 AK4531_DOUBLE("PCM Switch", 1, AK4531_LFM, AK4531_RFM, 7, 7, 1, 1),
 265 AK4531_DOUBLE("PCM Volume", 1, AK4531_LFM, AK4531_RFM, 0, 0, 0x1f, 1),
 266 AK4531_DOUBLE("PCM Playback Switch", 1, AK4531_OUT_SW1, AK4531_OUT_SW1, 6, 5, 1, 0),
 267 AK4531_INPUT_SW("PCM Capture Route", 1, AK4531_LIN_SW1, AK4531_RIN_SW1, 6, 5),
 268
 269 AK4531_DOUBLE("CD Switch", 0, AK4531_LCD, AK4531_RCD, 7, 7, 1, 1),
 270 AK4531_DOUBLE("CD Volume", 0, AK4531_LCD, AK4531_RCD, 0, 0, 0x1f, 1),
 271 AK4531_DOUBLE("CD Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 2, 1, 1, 0),
 272 AK4531_INPUT_SW("CD Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 2, 1),
 273
 274 AK4531_DOUBLE("Line Switch", 0, AK4531_LLINE, AK4531_RLINE, 7, 7, 1, 1),
 275 AK4531_DOUBLE("Line Volume", 0, AK4531_LLINE, AK4531_RLINE, 0, 0, 0x1f, 1),
 276 AK4531_DOUBLE("Line Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 4, 3, 1, 0),
 277 AK4531_INPUT_SW("Line Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 4, 3),
 278
 279 AK4531_DOUBLE("Aux Switch", 0, AK4531_LAUXA, AK4531_RAUXA, 7, 7, 1, 1),
 280 AK4531_DOUBLE("Aux Volume", 0, AK4531_LAUXA, AK4531_RAUXA, 0, 0, 0x1f, 1),
 281 AK4531_DOUBLE("Aux Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 5, 4, 1, 0),
 282 AK4531_INPUT_SW("Aux Capture Route", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 4, 3),
 283
 284 AK4531_SINGLE("Mono Switch", 0, AK4531_MONO1, 7, 1, 1),
 285 AK4531_SINGLE("Mono Volume", 0, AK4531_MONO1, 0, 0x1f, 1),
 286 AK4531_SINGLE("Mono Playback Switch", 0, AK4531_OUT_SW2, 0, 1, 0),
 287 AK4531_DOUBLE("Mono Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 0, 0, 1, 0),
 288
 289 AK4531_SINGLE("Mono Switch", 1, AK4531_MONO2, 7, 1, 1),
 290 AK4531_SINGLE("Mono Volume", 1, AK4531_MONO2, 0, 0x1f, 1),
 291 AK4531_SINGLE("Mono Playback Switch", 1, AK4531_OUT_SW2, 1, 1, 0),
 292 AK4531_DOUBLE("Mono Capture Switch", 1, AK4531_LIN_SW2, AK4531_RIN_SW2, 1, 1, 1, 0),
 293
 294 AK4531_SINGLE("Mic Volume", 0, AK4531_MIC, 0, 0x1f, 1),
 295 AK4531_SINGLE("Mic Switch", 0, AK4531_MIC, 7, 1, 1),
 296 AK4531_SINGLE("Mic Playback Switch", 0, AK4531_OUT_SW1, 0, 1, 0),
 297 AK4531_DOUBLE("Mic Capture Switch", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 0, 0, 1, 0),
 298
 299 AK4531_DOUBLE("Mic Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 7, 7, 1, 0),
 300 AK4531_DOUBLE("Mono1 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 6, 6, 1, 0),
 301 AK4531_DOUBLE("Mono2 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 5, 5, 1, 0),
 302
 303 AK4531_SINGLE("AD Input Select", 0, AK4531_AD_IN, 0, 1, 0),
 304 AK4531_SINGLE("Mic Boost (+30dB)", 0, AK4531_MIC_GAIN, 0, 1, 0)
 305 };
 306
 307 static int snd_ak4531_free(struct snd_ak4531 *ak4531)
 308 {
 309         if (ak4531) {
 310                 if (ak4531->private_free)
 311                         ak4531->private_free(ak4531);
 312                 kfree(ak4531);
 313         }
 314         return 0;
 315 }
 316
 317 static int snd_ak4531_dev_free(struct snd_device *device)
 318 {
 319         struct snd_ak4531 *ak4531 = device->device_data;
 320         return snd_ak4531_free(ak4531);
 321 }
 322
 323 static u8 snd_ak4531_initial_map[0x19 + 1] = {
 324         0x9f,           /* 00: Master Volume Lch */
 325         0x9f,           /* 01: Master Volume Rch */
 326         0x9f,           /* 02: Voice Volume Lch */
 327         0x9f,           /* 03: Voice Volume Rch */
 328         0x9f,           /* 04: FM Volume Lch */
 329         0x9f,           /* 05: FM Volume Rch */
 330         0x9f,           /* 06: CD Audio Volume Lch */
 331         0x9f,           /* 07: CD Audio Volume Rch */
 332         0x9f,           /* 08: Line Volume Lch */
 333         0x9f,           /* 09: Line Volume Rch */
 334         0x9f,           /* 0a: Aux Volume Lch */
 335         0x9f,           /* 0b: Aux Volume Rch */
 336         0x9f,           /* 0c: Mono1 Volume */
 337         0x9f,           /* 0d: Mono2 Volume */
 338         0x9f,           /* 0e: Mic Volume */
 339         0x87,           /* 0f: Mono-out Volume */
 340         0x00,           /* 10: Output Mixer SW1 */
 341         0x00,           /* 11: Output Mixer SW2 */
 342         0x00,           /* 12: Lch Input Mixer SW1 */
 343         0x00,           /* 13: Rch Input Mixer SW1 */
 344         0x00,           /* 14: Lch Input Mixer SW2 */
 345         0x00,           /* 15: Rch Input Mixer SW2 */
 346         0x00,           /* 16: Reset & Power Down */
 347         0x00,           /* 17: Clock Select */
 348         0x00,           /* 18: AD Input Select */
 349         0x01            /* 19: Mic Amp Setup */
 350 };
 351
 352 int snd_ak4531_mixer(struct snd_card *card, struct snd_ak4531 *_ak4531,
 353                      struct snd_ak4531 **rak4531)
 354 {
 355         unsigned int idx;
 356         int err;
 357         struct snd_ak4531 *ak4531;
 358         static struct snd_device_ops ops = {
 359                 .dev_free =     snd_ak4531_dev_free,
 360         };
 361
 362         snd_assert(rak4531 != NULL, return -EINVAL);
 363         *rak4531 = NULL;
 364         snd_assert(card != NULL && _ak4531 != NULL, return -EINVAL);
 365         ak4531 = kzalloc(sizeof(*ak4531), GFP_KERNEL);
 366         if (ak4531 == NULL)
 367                 return -ENOMEM;
 368         *ak4531 = *_ak4531;
 369         init_MUTEX(&ak4531->reg_mutex);
 370         if ((err = snd_component_add(card, "AK4531")) < 0) {
 371                 snd_ak4531_free(ak4531);
 372                 return err;
 373         }
 374         strcpy(card->mixername, "Asahi Kasei AK4531");
 375         ak4531->write(ak4531, AK4531_RESET, 0x03);      /* no RST, PD */
 376         udelay(100);
 377         ak4531->write(ak4531, AK4531_CLOCK, 0x00);      /* CODEC ADC and CODEC DAC use {LR,B}CLK2 and run off LRCLK2 PLL */
 378         for (idx = 0; idx <= 0x19; idx++) {
 379                 if (idx == AK4531_RESET || idx == AK4531_CLOCK)
 380                         continue;
 381                 ak4531->write(ak4531, idx, ak4531->regs[idx] = snd_ak4531_initial_map[idx]);    /* recording source is mixer */
 382         }
 383         for (idx = 0; idx < ARRAY_SIZE(snd_ak4531_controls); idx++) {
 384                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_ak4531_controls[idx], ak4531))) < 0) {
 385                         snd_ak4531_free(ak4531);
 386                         return err;
 387                 }
 388         }
 389         snd_ak4531_proc_init(card, ak4531);
 390         if ((err = snd_device_new(card, SNDRV_DEV_CODEC, ak4531, &ops)) < 0) {
 391                 snd_ak4531_free(ak4531);
 392                 return err;
 393         }
 394
 395 #if 0
 396         snd_ak4531_dump(ak4531);
 397 #endif
 398         *rak4531 = ak4531;
 399         return 0;
 400 }
 401
 402 /*
 403  * power management
 404  */
 405 #ifdef CONFIG_PM
 406 void snd_ak4531_suspend(struct snd_ak4531 *ak4531)
 407 {
 408         /* mute */
 409         ak4531->write(ak4531, AK4531_LMASTER, 0x9f);
 410         ak4531->write(ak4531, AK4531_RMASTER, 0x9f);
 411         /* powerdown */
 412         ak4531->write(ak4531, AK4531_RESET, 0x01);
 413 }
 414
 415 void snd_ak4531_resume(struct snd_ak4531 *ak4531)
 416 {
 417         int idx;
 418
 419         /* initialize */
 420         ak4531->write(ak4531, AK4531_RESET, 0x03);
 421         udelay(100);
 422         ak4531->write(ak4531, AK4531_CLOCK, 0x00);
 423         /* restore mixer registers */
 424         for (idx = 0; idx <= 0x19; idx++) {
 425                 if (idx == AK4531_RESET || idx == AK4531_CLOCK)
 426                         continue;
 427                 ak4531->write(ak4531, idx, ak4531->regs[idx]);
 428         }
 429 }
 430 #endif
 431
 432 #ifdef CONFIG_PROC_FS
 433 /*
 434  * /proc interface
 435  */
 436
 437 static void snd_ak4531_proc_read(struct snd_info_entry *entry,
 438                                  struct snd_info_buffer *buffer)
 439 {
 440         struct snd_ak4531 *ak4531 = entry->private_data;
 441
 442         snd_iprintf(buffer, "Asahi Kasei AK4531\n\n");
 443         snd_iprintf(buffer, "Recording source   : %s\n"
 444                     "MIC gain           : %s\n",
 445                     ak4531->regs[AK4531_AD_IN] & 1 ? "external" : "mixer",
 446                     ak4531->regs[AK4531_MIC_GAIN] & 1 ? "+30dB" : "+0dB");
 447 }
 448
 449 static void snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531)
 450 {
 451         struct snd_info_entry *entry;
 452
 453         if (! snd_card_proc_new(card, "ak4531", &entry))
 454                 snd_info_set_text_ops(entry, ak4531, 1024, snd_ak4531_proc_read);
 455 }
 456 #endif
 457
 458 EXPORT_SYMBOL(snd_ak4531_mixer);
 459 #ifdef CONFIG_PM
 460 EXPORT_SYMBOL(snd_ak4531_suspend);
 461 EXPORT_SYMBOL(snd_ak4531_resume);
 462 #endif
 463
 464 /*
 465  *  INIT part
 466  */
 467
 468 static int __init alsa_ak4531_init(void)
 469 {
 470         return 0;
 471 }
 472
 473 static void __exit alsa_ak4531_exit(void)
 474 {
 475 }
 476
 477 module_init(alsa_ak4531_init)
 478 module_exit(alsa_ak4531_exit)