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 <linux/mutex.h>
  27
  28 #include <sound/core.h>
  29 #include <sound/ak4531_codec.h>
  30
  31 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  32 MODULE_DESCRIPTION("Universal routines for AK4531 codec");
  33 MODULE_LICENSE("GPL");
  34
  35 #ifdef CONFIG_PROC_FS
  36 static void snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531);
  37 #else
  38 #define snd_ak4531_proc_init(card,ak)
  39 #endif
  40
  41 /*
  42  *
  43  */
  44
  45 #if 0
  46
  47 static void snd_ak4531_dump(struct snd_ak4531 *ak4531)
  48 {
  49         int idx;
  50
  51         for (idx = 0; idx < 0x19; idx++)
  52                 printk("ak4531 0x%x: 0x%x\n", idx, ak4531->regs[idx]);
  53 }
  54
  55 #endif
  56
  57 /*
  58  *
  59  */
  60
  61 #define AK4531_SINGLE(xname, xindex, reg, shift, mask, invert) \
  62 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
  63   .info = snd_ak4531_info_single, \
  64   .get = snd_ak4531_get_single, .put = snd_ak4531_put_single, \
  65   .private_value = reg | (shift << 16) | (mask << 24) | (invert << 22) }
  66
  67 static int snd_ak4531_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
  68 {
  69         int mask = (kcontrol->private_value >> 24) & 0xff;
  70
  71         uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
  72         uinfo->count = 1;
  73         uinfo->value.integer.min = 0;
  74         uinfo->value.integer.max = mask;
  75         return 0;
  76 }
  77
  78 static int snd_ak4531_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  79 {
  80         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
  81         int reg = kcontrol->private_value & 0xff;
  82         int shift = (kcontrol->private_value >> 16) & 0x07;
  83         int mask = (kcontrol->private_value >> 24) & 0xff;
  84         int invert = (kcontrol->private_value >> 22) & 1;
  85         int val;
  86
  87         mutex_lock(&ak4531->reg_mutex);
  88         val = (ak4531->regs[reg] >> shift) & mask;
  89         mutex_unlock(&ak4531->reg_mutex);
  90         if (invert) {
  91                 val = mask - val;
  92         }
  93         ucontrol->value.integer.value[0] = val;
  94         return 0;
  95 }
  96
  97 static int snd_ak4531_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
  98 {
  99         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 100         int reg = kcontrol->private_value & 0xff;
 101         int shift = (kcontrol->private_value >> 16) & 0x07;
 102         int mask = (kcontrol->private_value >> 24) & 0xff;
 103         int invert = (kcontrol->private_value >> 22) & 1;
 104         int change;
 105         int val;
 106
 107         val = ucontrol->value.integer.value[0] & mask;
 108         if (invert) {
 109                 val = mask - val;
 110         }
 111         val <<= shift;
 112         mutex_lock(&ak4531->reg_mutex);
 113         val = (ak4531->regs[reg] & ~(mask << shift)) | val;
 114         change = val != ak4531->regs[reg];
 115         ak4531->write(ak4531, reg, ak4531->regs[reg] = val);
 116         mutex_unlock(&ak4531->reg_mutex);
 117         return change;
 118 }
 119
 120 #define AK4531_DOUBLE(xname, xindex, left_reg, right_reg, left_shift, right_shift, mask, invert) \
 121 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 122   .info = snd_ak4531_info_double, \
 123   .get = snd_ak4531_get_double, .put = snd_ak4531_put_double, \
 124   .private_value = left_reg | (right_reg << 8) | (left_shift << 16) | (right_shift << 19) | (mask << 24) | (invert << 22) }
 125
 126 static int snd_ak4531_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 127 {
 128         int mask = (kcontrol->private_value >> 24) & 0xff;
 129
 130         uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
 131         uinfo->count = 2;
 132         uinfo->value.integer.min = 0;
 133         uinfo->value.integer.max = mask;
 134         return 0;
 135 }
 136
 137 static int snd_ak4531_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 138 {
 139         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 140         int left_reg = kcontrol->private_value & 0xff;
 141         int right_reg = (kcontrol->private_value >> 8) & 0xff;
 142         int left_shift = (kcontrol->private_value >> 16) & 0x07;
 143         int right_shift = (kcontrol->private_value >> 19) & 0x07;
 144         int mask = (kcontrol->private_value >> 24) & 0xff;
 145         int invert = (kcontrol->private_value >> 22) & 1;
 146         int left, right;
 147
 148         mutex_lock(&ak4531->reg_mutex);
 149         left = (ak4531->regs[left_reg] >> left_shift) & mask;
 150         right = (ak4531->regs[right_reg] >> right_shift) & mask;
 151         mutex_unlock(&ak4531->reg_mutex);
 152         if (invert) {
 153                 left = mask - left;
 154                 right = mask - right;
 155         }
 156         ucontrol->value.integer.value[0] = left;
 157         ucontrol->value.integer.value[1] = right;
 158         return 0;
 159 }
 160
 161 static int snd_ak4531_put_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 162 {
 163         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 164         int left_reg = kcontrol->private_value & 0xff;
 165         int right_reg = (kcontrol->private_value >> 8) & 0xff;
 166         int left_shift = (kcontrol->private_value >> 16) & 0x07;
 167         int right_shift = (kcontrol->private_value >> 19) & 0x07;
 168         int mask = (kcontrol->private_value >> 24) & 0xff;
 169         int invert = (kcontrol->private_value >> 22) & 1;
 170         int change;
 171         int left, right;
 172
 173         left = ucontrol->value.integer.value[0] & mask;
 174         right = ucontrol->value.integer.value[1] & mask;
 175         if (invert) {
 176                 left = mask - left;
 177                 right = mask - right;
 178         }
 179         left <<= left_shift;
 180         right <<= right_shift;
 181         mutex_lock(&ak4531->reg_mutex);
 182         if (left_reg == right_reg) {
 183                 left = (ak4531->regs[left_reg] & ~((mask << left_shift) | (mask << right_shift))) | left | right;
 184                 change = left != ak4531->regs[left_reg];
 185                 ak4531->write(ak4531, left_reg, ak4531->regs[left_reg] = left);
 186         } else {
 187                 left = (ak4531->regs[left_reg] & ~(mask << left_shift)) | left;
 188                 right = (ak4531->regs[right_reg] & ~(mask << right_shift)) | right;
 189                 change = left != ak4531->regs[left_reg] || right != ak4531->regs[right_reg];
 190                 ak4531->write(ak4531, left_reg, ak4531->regs[left_reg] = left);
 191                 ak4531->write(ak4531, right_reg, ak4531->regs[right_reg] = right);
 192         }
 193         mutex_unlock(&ak4531->reg_mutex);
 194         return change;
 195 }
 196
 197 #define AK4531_INPUT_SW(xname, xindex, reg1, reg2, left_shift, right_shift) \
 198 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
 199   .info = snd_ak4531_info_input_sw, \
 200   .get = snd_ak4531_get_input_sw, .put = snd_ak4531_put_input_sw, \
 201   .private_value = reg1 | (reg2 << 8) | (left_shift << 16) | (right_shift << 24) }
 202
 203 static int snd_ak4531_info_input_sw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
 204 {
 205         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
 206         uinfo->count = 4;
 207         uinfo->value.integer.min = 0;
 208         uinfo->value.integer.max = 1;
 209         return 0;
 210 }
 211
 212 static int snd_ak4531_get_input_sw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 213 {
 214         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 215         int reg1 = kcontrol->private_value & 0xff;
 216         int reg2 = (kcontrol->private_value >> 8) & 0xff;
 217         int left_shift = (kcontrol->private_value >> 16) & 0x0f;
 218         int right_shift = (kcontrol->private_value >> 24) & 0x0f;
 219
 220         mutex_lock(&ak4531->reg_mutex);
 221         ucontrol->value.integer.value[0] = (ak4531->regs[reg1] >> left_shift) & 1;
 222         ucontrol->value.integer.value[1] = (ak4531->regs[reg2] >> left_shift) & 1;
 223         ucontrol->value.integer.value[2] = (ak4531->regs[reg1] >> right_shift) & 1;
 224         ucontrol->value.integer.value[3] = (ak4531->regs[reg2] >> right_shift) & 1;
 225         mutex_unlock(&ak4531->reg_mutex);
 226         return 0;
 227 }
 228
 229 static int snd_ak4531_put_input_sw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
 230 {
 231         struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol);
 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         mutex_lock(&ak4531->reg_mutex);
 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         mutex_unlock(&ak4531->reg_mutex);
 250         return change;
 251 }
 252
 253 static struct snd_kcontrol_new 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(struct snd_ak4531 *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(struct snd_device *device)
 320 {
 321         struct snd_ak4531 *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(struct snd_card *card, struct snd_ak4531 *_ak4531,
 355                      struct snd_ak4531 **rak4531)
 356 {
 357         unsigned int idx;
 358         int err;
 359         struct snd_ak4531 *ak4531;
 360         static struct snd_device_ops ops = {
 361                 .dev_free =     snd_ak4531_dev_free,
 362         };
 363
 364         snd_assert(rak4531 != NULL, return -EINVAL);
 365         *rak4531 = NULL;
 366         snd_assert(card != NULL && _ak4531 != NULL, return -EINVAL);
 367         ak4531 = kzalloc(sizeof(*ak4531), GFP_KERNEL);
 368         if (ak4531 == NULL)
 369                 return -ENOMEM;
 370         *ak4531 = *_ak4531;
 371         mutex_init(&ak4531->reg_mutex);
 372         if ((err = snd_component_add(card, "AK4531")) < 0) {
 373                 snd_ak4531_free(ak4531);
 374                 return err;
 375         }
 376         strcpy(card->mixername, "Asahi Kasei AK4531");
 377         ak4531->write(ak4531, AK4531_RESET, 0x03);      /* no RST, PD */
 378         udelay(100);
 379         ak4531->write(ak4531, AK4531_CLOCK, 0x00);      /* CODEC ADC and CODEC DAC use {LR,B}CLK2 and run off LRCLK2 PLL */
 380         for (idx = 0; idx <= 0x19; idx++) {
 381                 if (idx == AK4531_RESET || idx == AK4531_CLOCK)
 382                         continue;
 383                 ak4531->write(ak4531, idx, ak4531->regs[idx] = snd_ak4531_initial_map[idx]);    /* recording source is mixer */
 384         }
 385         for (idx = 0; idx < ARRAY_SIZE(snd_ak4531_controls); idx++) {
 386                 if ((err = snd_ctl_add(card, snd_ctl_new1(&snd_ak4531_controls[idx], ak4531))) < 0) {
 387                         snd_ak4531_free(ak4531);
 388                         return err;
 389                 }
 390         }
 391         snd_ak4531_proc_init(card, ak4531);
 392         if ((err = snd_device_new(card, SNDRV_DEV_CODEC, ak4531, &ops)) < 0) {
 393                 snd_ak4531_free(ak4531);
 394                 return err;
 395         }
 396
 397 #if 0
 398         snd_ak4531_dump(ak4531);
 399 #endif
 400         *rak4531 = ak4531;
 401         return 0;
 402 }
 403
 404 /*
 405  * power management
 406  */
 407 #ifdef CONFIG_PM
 408 void snd_ak4531_suspend(struct snd_ak4531 *ak4531)
 409 {
 410         /* mute */
 411         ak4531->write(ak4531, AK4531_LMASTER, 0x9f);
 412         ak4531->write(ak4531, AK4531_RMASTER, 0x9f);
 413         /* powerdown */
 414         ak4531->write(ak4531, AK4531_RESET, 0x01);
 415 }
 416
 417 void snd_ak4531_resume(struct snd_ak4531 *ak4531)
 418 {
 419         int idx;
 420
 421         /* initialize */
 422         ak4531->write(ak4531, AK4531_RESET, 0x03);
 423         udelay(100);
 424         ak4531->write(ak4531, AK4531_CLOCK, 0x00);
 425         /* restore mixer registers */
 426         for (idx = 0; idx <= 0x19; idx++) {
 427                 if (idx == AK4531_RESET || idx == AK4531_CLOCK)
 428                         continue;
 429                 ak4531->write(ak4531, idx, ak4531->regs[idx]);
 430         }
 431 }
 432 #endif
 433
 434 #ifdef CONFIG_PROC_FS
 435 /*
 436  * /proc interface
 437  */
 438
 439 static void snd_ak4531_proc_read(struct snd_info_entry *entry,
 440                                  struct snd_info_buffer *buffer)
 441 {
 442         struct snd_ak4531 *ak4531 = entry->private_data;
 443
 444         snd_iprintf(buffer, "Asahi Kasei AK4531\n\n");
 445         snd_iprintf(buffer, "Recording source   : %s\n"
 446                     "MIC gain           : %s\n",
 447                     ak4531->regs[AK4531_AD_IN] & 1 ? "external" : "mixer",
 448                     ak4531->regs[AK4531_MIC_GAIN] & 1 ? "+30dB" : "+0dB");
 449 }
 450
 451 static void snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531)
 452 {
 453         struct snd_info_entry *entry;
 454
 455         if (! snd_card_proc_new(card, "ak4531", &entry))
 456                 snd_info_set_text_ops(entry, ak4531, snd_ak4531_proc_read);
 457 }
 458 #endif
 459
 460 EXPORT_SYMBOL(snd_ak4531_mixer);
 461 #ifdef CONFIG_PM
 462 EXPORT_SYMBOL(snd_ak4531_suspend);
 463 EXPORT_SYMBOL(snd_ak4531_resume);
 464 #endif
 465
 466 /*
 467  *  INIT part
 468  */
 469
 470 static int __init alsa_ak4531_init(void)
 471 {
 472         return 0;
 473 }
 474
 475 static void __exit alsa_ak4531_exit(void)
 476 {
 477 }
 478
 479 module_init(alsa_ak4531_init)
 480 module_exit(alsa_ak4531_exit)