CoCalc -- ak4531

GitHub Repository: torvalds/linux
Path: blob/master/sound/pci/ak4531_codec.c
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1
// SPDX-License-Identifier: GPL-2.0-or-later
2
/*
3
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
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 <[email protected]>");
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++)
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		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, \
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  .info = snd_ak4531_info_single, \
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  .get = snd_ak4531_get_single, .put = snd_ak4531_put_single, \
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  .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, \
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  .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
54
  .name = xname, .index = xindex, \
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  .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;
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}
110

111
#define AK4531_DOUBLE(xname, xindex, left_reg, right_reg, left_shift, right_shift, mask, invert) \
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{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
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  .info = snd_ak4531_info_double, \
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  .get = snd_ak4531_get_double, .put = snd_ak4531_put_double, \
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  .private_value = left_reg | (right_reg << 8) | (left_shift << 16) | (right_shift << 19) | (mask << 24) | (invert << 22) }
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#define AK4531_DOUBLE_TLV(xname, xindex, left_reg, right_reg, left_shift, right_shift, mask, invert, xtlv) \
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{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
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  .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, \
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  .name = xname, .index = xindex, \
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  .info = snd_ak4531_info_double, \
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  .get = snd_ak4531_get_double, .put = snd_ak4531_put_double, \
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  .private_value = left_reg | (right_reg << 8) | (left_shift << 16) | (right_shift << 19) | (mask << 24) | (invert << 22), \
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  .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, \
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  .info = snd_ak4531_info_input_sw, \
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  .get = snd_ak4531_get_input_sw, .put = snd_ak4531_put_input_sw, \
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  .private_value = reg1 | (reg2 << 8) | (left_shift << 16) | (right_shift << 24) }
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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

469
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