1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * Universal routines for AK4531 codec 5 */ 6 7 #include <linux/delay.h> 8 #include <linux/init.h> 9 #include <linux/slab.h> 10 #include <linux/mutex.h> 11 #include <linux/module.h> 12 13 #include <sound/core.h> 14 #include <sound/ak4531_codec.h> 15 #include <sound/tlv.h> 16 17 /* 18 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 19 MODULE_DESCRIPTION("Universal routines for AK4531 codec"); 20 MODULE_LICENSE("GPL"); 21 */ 22 23 static void snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531); 24 25 /* 26 * 27 */ 28 29 #if 0 30 31 static void snd_ak4531_dump(struct snd_ak4531 *ak4531) 32 { 33 int idx; 34 35 for (idx = 0; idx < 0x19; idx++) 36 printk(KERN_DEBUG "ak4531 0x%x: 0x%x\n", 37 idx, ak4531->regs[idx]); 38 } 39 40 #endif 41 42 /* 43 * 44 */ 45 46 #define AK4531_SINGLE(xname, xindex, reg, shift, mask, invert) \ 47 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ 48 .info = snd_ak4531_info_single, \ 49 .get = snd_ak4531_get_single, .put = snd_ak4531_put_single, \ 50 .private_value = reg | (shift << 16) | (mask << 24) | (invert << 22) } 51 #define AK4531_SINGLE_TLV(xname, xindex, reg, shift, mask, invert, xtlv) \ 52 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 53 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \ 54 .name = xname, .index = xindex, \ 55 .info = snd_ak4531_info_single, \ 56 .get = snd_ak4531_get_single, .put = snd_ak4531_put_single, \ 57 .private_value = reg | (shift << 16) | (mask << 24) | (invert << 22), \ 58 .tlv = { .p = (xtlv) } } 59 60 static int snd_ak4531_info_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 61 { 62 int mask = (kcontrol->private_value >> 24) & 0xff; 63 64 uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER; 65 uinfo->count = 1; 66 uinfo->value.integer.min = 0; 67 uinfo->value.integer.max = mask; 68 return 0; 69 } 70 71 static int snd_ak4531_get_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 72 { 73 struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol); 74 int reg = kcontrol->private_value & 0xff; 75 int shift = (kcontrol->private_value >> 16) & 0x07; 76 int mask = (kcontrol->private_value >> 24) & 0xff; 77 int invert = (kcontrol->private_value >> 22) & 1; 78 int val; 79 80 guard(mutex)(&ak4531->reg_mutex); 81 val = (ak4531->regs[reg] >> shift) & mask; 82 if (invert) { 83 val = mask - val; 84 } 85 ucontrol->value.integer.value[0] = val; 86 return 0; 87 } 88 89 static int snd_ak4531_put_single(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 90 { 91 struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol); 92 int reg = kcontrol->private_value & 0xff; 93 int shift = (kcontrol->private_value >> 16) & 0x07; 94 int mask = (kcontrol->private_value >> 24) & 0xff; 95 int invert = (kcontrol->private_value >> 22) & 1; 96 int change; 97 int val; 98 99 val = ucontrol->value.integer.value[0] & mask; 100 if (invert) { 101 val = mask - val; 102 } 103 val <<= shift; 104 guard(mutex)(&ak4531->reg_mutex); 105 val = (ak4531->regs[reg] & ~(mask << shift)) | val; 106 change = val != ak4531->regs[reg]; 107 ak4531->write(ak4531, reg, ak4531->regs[reg] = val); 108 return change; 109 } 110 111 #define AK4531_DOUBLE(xname, xindex, left_reg, right_reg, left_shift, right_shift, mask, invert) \ 112 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ 113 .info = snd_ak4531_info_double, \ 114 .get = snd_ak4531_get_double, .put = snd_ak4531_put_double, \ 115 .private_value = left_reg | (right_reg << 8) | (left_shift << 16) | (right_shift << 19) | (mask << 24) | (invert << 22) } 116 #define AK4531_DOUBLE_TLV(xname, xindex, left_reg, right_reg, left_shift, right_shift, mask, invert, xtlv) \ 117 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \ 118 .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \ 119 .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 .tlv = { .p = (xtlv) } } 124 125 static int snd_ak4531_info_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 126 { 127 int mask = (kcontrol->private_value >> 24) & 0xff; 128 129 uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER; 130 uinfo->count = 2; 131 uinfo->value.integer.min = 0; 132 uinfo->value.integer.max = mask; 133 return 0; 134 } 135 136 static int snd_ak4531_get_double(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 137 { 138 struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol); 139 int left_reg = kcontrol->private_value & 0xff; 140 int right_reg = (kcontrol->private_value >> 8) & 0xff; 141 int left_shift = (kcontrol->private_value >> 16) & 0x07; 142 int right_shift = (kcontrol->private_value >> 19) & 0x07; 143 int mask = (kcontrol->private_value >> 24) & 0xff; 144 int invert = (kcontrol->private_value >> 22) & 1; 145 int left, right; 146 147 guard(mutex)(&ak4531->reg_mutex); 148 left = (ak4531->regs[left_reg] >> left_shift) & mask; 149 right = (ak4531->regs[right_reg] >> right_shift) & mask; 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 guard(mutex)(&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 return change; 192 } 193 194 #define AK4531_INPUT_SW(xname, xindex, reg1, reg2, left_shift, right_shift) \ 195 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \ 196 .info = snd_ak4531_info_input_sw, \ 197 .get = snd_ak4531_get_input_sw, .put = snd_ak4531_put_input_sw, \ 198 .private_value = reg1 | (reg2 << 8) | (left_shift << 16) | (right_shift << 24) } 199 200 static int snd_ak4531_info_input_sw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) 201 { 202 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN; 203 uinfo->count = 4; 204 uinfo->value.integer.min = 0; 205 uinfo->value.integer.max = 1; 206 return 0; 207 } 208 209 static int snd_ak4531_get_input_sw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 210 { 211 struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol); 212 int reg1 = kcontrol->private_value & 0xff; 213 int reg2 = (kcontrol->private_value >> 8) & 0xff; 214 int left_shift = (kcontrol->private_value >> 16) & 0x0f; 215 int right_shift = (kcontrol->private_value >> 24) & 0x0f; 216 217 guard(mutex)(&ak4531->reg_mutex); 218 ucontrol->value.integer.value[0] = (ak4531->regs[reg1] >> left_shift) & 1; 219 ucontrol->value.integer.value[1] = (ak4531->regs[reg2] >> left_shift) & 1; 220 ucontrol->value.integer.value[2] = (ak4531->regs[reg1] >> right_shift) & 1; 221 ucontrol->value.integer.value[3] = (ak4531->regs[reg2] >> right_shift) & 1; 222 return 0; 223 } 224 225 static int snd_ak4531_put_input_sw(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) 226 { 227 struct snd_ak4531 *ak4531 = snd_kcontrol_chip(kcontrol); 228 int reg1 = kcontrol->private_value & 0xff; 229 int reg2 = (kcontrol->private_value >> 8) & 0xff; 230 int left_shift = (kcontrol->private_value >> 16) & 0x0f; 231 int right_shift = (kcontrol->private_value >> 24) & 0x0f; 232 int change; 233 int val1, val2; 234 235 guard(mutex)(&ak4531->reg_mutex); 236 val1 = ak4531->regs[reg1] & ~((1 << left_shift) | (1 << right_shift)); 237 val2 = ak4531->regs[reg2] & ~((1 << left_shift) | (1 << right_shift)); 238 val1 |= (ucontrol->value.integer.value[0] & 1) << left_shift; 239 val2 |= (ucontrol->value.integer.value[1] & 1) << left_shift; 240 val1 |= (ucontrol->value.integer.value[2] & 1) << right_shift; 241 val2 |= (ucontrol->value.integer.value[3] & 1) << right_shift; 242 change = val1 != ak4531->regs[reg1] || val2 != ak4531->regs[reg2]; 243 ak4531->write(ak4531, reg1, ak4531->regs[reg1] = val1); 244 ak4531->write(ak4531, reg2, ak4531->regs[reg2] = val2); 245 return change; 246 } 247 248 static const DECLARE_TLV_DB_SCALE(db_scale_master, -6200, 200, 0); 249 static const DECLARE_TLV_DB_SCALE(db_scale_mono, -2800, 400, 0); 250 static const DECLARE_TLV_DB_SCALE(db_scale_input, -5000, 200, 0); 251 252 static const struct snd_kcontrol_new snd_ak4531_controls[] = { 253 254 AK4531_DOUBLE_TLV("Master Playback Switch", 0, 255 AK4531_LMASTER, AK4531_RMASTER, 7, 7, 1, 1, 256 db_scale_master), 257 AK4531_DOUBLE("Master Playback Volume", 0, AK4531_LMASTER, AK4531_RMASTER, 0, 0, 0x1f, 1), 258 259 AK4531_SINGLE_TLV("Master Mono Playback Switch", 0, AK4531_MONO_OUT, 7, 1, 1, 260 db_scale_mono), 261 AK4531_SINGLE("Master Mono Playback Volume", 0, AK4531_MONO_OUT, 0, 0x07, 1), 262 263 AK4531_DOUBLE("PCM Switch", 0, AK4531_LVOICE, AK4531_RVOICE, 7, 7, 1, 1), 264 AK4531_DOUBLE_TLV("PCM Volume", 0, AK4531_LVOICE, AK4531_RVOICE, 0, 0, 0x1f, 1, 265 db_scale_input), 266 AK4531_DOUBLE("PCM Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 3, 2, 1, 0), 267 AK4531_DOUBLE("PCM Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 2, 2, 1, 0), 268 269 AK4531_DOUBLE("PCM Switch", 1, AK4531_LFM, AK4531_RFM, 7, 7, 1, 1), 270 AK4531_DOUBLE_TLV("PCM Volume", 1, AK4531_LFM, AK4531_RFM, 0, 0, 0x1f, 1, 271 db_scale_input), 272 AK4531_DOUBLE("PCM Playback Switch", 1, AK4531_OUT_SW1, AK4531_OUT_SW1, 6, 5, 1, 0), 273 AK4531_INPUT_SW("PCM Capture Route", 1, AK4531_LIN_SW1, AK4531_RIN_SW1, 6, 5), 274 275 AK4531_DOUBLE("CD Switch", 0, AK4531_LCD, AK4531_RCD, 7, 7, 1, 1), 276 AK4531_DOUBLE_TLV("CD Volume", 0, AK4531_LCD, AK4531_RCD, 0, 0, 0x1f, 1, 277 db_scale_input), 278 AK4531_DOUBLE("CD Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 2, 1, 1, 0), 279 AK4531_INPUT_SW("CD Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 2, 1), 280 281 AK4531_DOUBLE("Line Switch", 0, AK4531_LLINE, AK4531_RLINE, 7, 7, 1, 1), 282 AK4531_DOUBLE_TLV("Line Volume", 0, AK4531_LLINE, AK4531_RLINE, 0, 0, 0x1f, 1, 283 db_scale_input), 284 AK4531_DOUBLE("Line Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 4, 3, 1, 0), 285 AK4531_INPUT_SW("Line Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 4, 3), 286 287 AK4531_DOUBLE("Aux Switch", 0, AK4531_LAUXA, AK4531_RAUXA, 7, 7, 1, 1), 288 AK4531_DOUBLE_TLV("Aux Volume", 0, AK4531_LAUXA, AK4531_RAUXA, 0, 0, 0x1f, 1, 289 db_scale_input), 290 AK4531_DOUBLE("Aux Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 5, 4, 1, 0), 291 AK4531_INPUT_SW("Aux Capture Route", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 4, 3), 292 293 AK4531_SINGLE("Mono Switch", 0, AK4531_MONO1, 7, 1, 1), 294 AK4531_SINGLE_TLV("Mono Volume", 0, AK4531_MONO1, 0, 0x1f, 1, db_scale_input), 295 AK4531_SINGLE("Mono Playback Switch", 0, AK4531_OUT_SW2, 0, 1, 0), 296 AK4531_DOUBLE("Mono Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 0, 0, 1, 0), 297 298 AK4531_SINGLE("Mono Switch", 1, AK4531_MONO2, 7, 1, 1), 299 AK4531_SINGLE_TLV("Mono Volume", 1, AK4531_MONO2, 0, 0x1f, 1, db_scale_input), 300 AK4531_SINGLE("Mono Playback Switch", 1, AK4531_OUT_SW2, 1, 1, 0), 301 AK4531_DOUBLE("Mono Capture Switch", 1, AK4531_LIN_SW2, AK4531_RIN_SW2, 1, 1, 1, 0), 302 303 AK4531_SINGLE_TLV("Mic Volume", 0, AK4531_MIC, 0, 0x1f, 1, db_scale_input), 304 AK4531_SINGLE("Mic Switch", 0, AK4531_MIC, 7, 1, 1), 305 AK4531_SINGLE("Mic Playback Switch", 0, AK4531_OUT_SW1, 0, 1, 0), 306 AK4531_DOUBLE("Mic Capture Switch", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 0, 0, 1, 0), 307 308 AK4531_DOUBLE("Mic Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 7, 7, 1, 0), 309 AK4531_DOUBLE("Mono1 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 6, 6, 1, 0), 310 AK4531_DOUBLE("Mono2 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 5, 5, 1, 0), 311 312 AK4531_SINGLE("AD Input Select", 0, AK4531_AD_IN, 0, 1, 0), 313 AK4531_SINGLE("Mic Boost (+30dB)", 0, AK4531_MIC_GAIN, 0, 1, 0) 314 }; 315 316 static int snd_ak4531_free(struct snd_ak4531 *ak4531) 317 { 318 if (ak4531) { 319 if (ak4531->private_free) 320 ak4531->private_free(ak4531); 321 kfree(ak4531); 322 } 323 return 0; 324 } 325 326 static int snd_ak4531_dev_free(struct snd_device *device) 327 { 328 struct snd_ak4531 *ak4531 = device->device_data; 329 return snd_ak4531_free(ak4531); 330 } 331 332 static const u8 snd_ak4531_initial_map[0x19 + 1] = { 333 0x9f, /* 00: Master Volume Lch */ 334 0x9f, /* 01: Master Volume Rch */ 335 0x9f, /* 02: Voice Volume Lch */ 336 0x9f, /* 03: Voice Volume Rch */ 337 0x9f, /* 04: FM Volume Lch */ 338 0x9f, /* 05: FM Volume Rch */ 339 0x9f, /* 06: CD Audio Volume Lch */ 340 0x9f, /* 07: CD Audio Volume Rch */ 341 0x9f, /* 08: Line Volume Lch */ 342 0x9f, /* 09: Line Volume Rch */ 343 0x9f, /* 0a: Aux Volume Lch */ 344 0x9f, /* 0b: Aux Volume Rch */ 345 0x9f, /* 0c: Mono1 Volume */ 346 0x9f, /* 0d: Mono2 Volume */ 347 0x9f, /* 0e: Mic Volume */ 348 0x87, /* 0f: Mono-out Volume */ 349 0x00, /* 10: Output Mixer SW1 */ 350 0x00, /* 11: Output Mixer SW2 */ 351 0x00, /* 12: Lch Input Mixer SW1 */ 352 0x00, /* 13: Rch Input Mixer SW1 */ 353 0x00, /* 14: Lch Input Mixer SW2 */ 354 0x00, /* 15: Rch Input Mixer SW2 */ 355 0x00, /* 16: Reset & Power Down */ 356 0x00, /* 17: Clock Select */ 357 0x00, /* 18: AD Input Select */ 358 0x01 /* 19: Mic Amp Setup */ 359 }; 360 361 int snd_ak4531_mixer(struct snd_card *card, 362 struct snd_ak4531 *_ak4531, 363 struct snd_ak4531 **rak4531) 364 { 365 unsigned int idx; 366 int err; 367 struct snd_ak4531 *ak4531; 368 static const struct snd_device_ops ops = { 369 .dev_free = snd_ak4531_dev_free, 370 }; 371 372 if (snd_BUG_ON(!card || !_ak4531)) 373 return -EINVAL; 374 if (rak4531) 375 *rak4531 = NULL; 376 ak4531 = kzalloc(sizeof(*ak4531), GFP_KERNEL); 377 if (ak4531 == NULL) 378 return -ENOMEM; 379 *ak4531 = *_ak4531; 380 mutex_init(&ak4531->reg_mutex); 381 err = snd_component_add(card, "AK4531"); 382 if (err < 0) { 383 snd_ak4531_free(ak4531); 384 return err; 385 } 386 strscpy(card->mixername, "Asahi Kasei AK4531"); 387 ak4531->write(ak4531, AK4531_RESET, 0x03); /* no RST, PD */ 388 udelay(100); 389 ak4531->write(ak4531, AK4531_CLOCK, 0x00); /* CODEC ADC and CODEC DAC use {LR,B}CLK2 and run off LRCLK2 PLL */ 390 for (idx = 0; idx <= 0x19; idx++) { 391 if (idx == AK4531_RESET || idx == AK4531_CLOCK) 392 continue; 393 ak4531->write(ak4531, idx, ak4531->regs[idx] = snd_ak4531_initial_map[idx]); /* recording source is mixer */ 394 } 395 for (idx = 0; idx < ARRAY_SIZE(snd_ak4531_controls); idx++) { 396 err = snd_ctl_add(card, snd_ctl_new1(&snd_ak4531_controls[idx], ak4531)); 397 if (err < 0) { 398 snd_ak4531_free(ak4531); 399 return err; 400 } 401 } 402 snd_ak4531_proc_init(card, ak4531); 403 err = snd_device_new(card, SNDRV_DEV_CODEC, ak4531, &ops); 404 if (err < 0) { 405 snd_ak4531_free(ak4531); 406 return err; 407 } 408 409 #if 0 410 snd_ak4531_dump(ak4531); 411 #endif 412 if (rak4531) 413 *rak4531 = ak4531; 414 return 0; 415 } 416 417 /* 418 * power management 419 */ 420 #ifdef CONFIG_PM 421 void snd_ak4531_suspend(struct snd_ak4531 *ak4531) 422 { 423 /* mute */ 424 ak4531->write(ak4531, AK4531_LMASTER, 0x9f); 425 ak4531->write(ak4531, AK4531_RMASTER, 0x9f); 426 /* powerdown */ 427 ak4531->write(ak4531, AK4531_RESET, 0x01); 428 } 429 430 void snd_ak4531_resume(struct snd_ak4531 *ak4531) 431 { 432 int idx; 433 434 /* initialize */ 435 ak4531->write(ak4531, AK4531_RESET, 0x03); 436 udelay(100); 437 ak4531->write(ak4531, AK4531_CLOCK, 0x00); 438 /* restore mixer registers */ 439 for (idx = 0; idx <= 0x19; idx++) { 440 if (idx == AK4531_RESET || idx == AK4531_CLOCK) 441 continue; 442 ak4531->write(ak4531, idx, ak4531->regs[idx]); 443 } 444 } 445 #endif 446 447 /* 448 * /proc interface 449 */ 450 451 static void snd_ak4531_proc_read(struct snd_info_entry *entry, 452 struct snd_info_buffer *buffer) 453 { 454 struct snd_ak4531 *ak4531 = entry->private_data; 455 456 snd_iprintf(buffer, "Asahi Kasei AK4531\n\n"); 457 snd_iprintf(buffer, "Recording source : %s\n" 458 "MIC gain : %s\n", 459 ak4531->regs[AK4531_AD_IN] & 1 ? "external" : "mixer", 460 ak4531->regs[AK4531_MIC_GAIN] & 1 ? "+30dB" : "+0dB"); 461 } 462 463 static void 464 snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531) 465 { 466 snd_card_ro_proc_new(card, "ak4531", ak4531, snd_ak4531_proc_read); 467 } 468