ak4531_codec.c

  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/*
 18MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 19MODULE_DESCRIPTION("Universal routines for AK4531 codec");
 20MODULE_LICENSE("GPL");
 21*/
 22
 23static void snd_ak4531_proc_init(struct snd_card *card, struct snd_ak4531 *ak4531);
 24
 25/*
 26 *
 27 */
 28 
 29#if 0
 30
 31static 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
 60static 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 
 71static 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
 89static 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
125static 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 
136static 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
159static 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
200static 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 
209static 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
225static 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
248static const DECLARE_TLV_DB_SCALE(db_scale_master, -6200, 200, 0);
249static const DECLARE_TLV_DB_SCALE(db_scale_mono, -2800, 400, 0);
250static const DECLARE_TLV_DB_SCALE(db_scale_input, -5000, 200, 0);
251
252static const struct snd_kcontrol_new snd_ak4531_controls[] = {
253
254AK4531_DOUBLE_TLV("Master Playback Switch", 0,
255		  AK4531_LMASTER, AK4531_RMASTER, 7, 7, 1, 1,
256		  db_scale_master),
257AK4531_DOUBLE("Master Playback Volume", 0, AK4531_LMASTER, AK4531_RMASTER, 0, 0, 0x1f, 1),
258
259AK4531_SINGLE_TLV("Master Mono Playback Switch", 0, AK4531_MONO_OUT, 7, 1, 1,
260		  db_scale_mono),
261AK4531_SINGLE("Master Mono Playback Volume", 0, AK4531_MONO_OUT, 0, 0x07, 1),
262
263AK4531_DOUBLE("PCM Switch", 0, AK4531_LVOICE, AK4531_RVOICE, 7, 7, 1, 1),
264AK4531_DOUBLE_TLV("PCM Volume", 0, AK4531_LVOICE, AK4531_RVOICE, 0, 0, 0x1f, 1,
265		  db_scale_input),
266AK4531_DOUBLE("PCM Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 3, 2, 1, 0),
267AK4531_DOUBLE("PCM Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 2, 2, 1, 0),
268
269AK4531_DOUBLE("PCM Switch", 1, AK4531_LFM, AK4531_RFM, 7, 7, 1, 1),
270AK4531_DOUBLE_TLV("PCM Volume", 1, AK4531_LFM, AK4531_RFM, 0, 0, 0x1f, 1,
271		  db_scale_input),
272AK4531_DOUBLE("PCM Playback Switch", 1, AK4531_OUT_SW1, AK4531_OUT_SW1, 6, 5, 1, 0),
273AK4531_INPUT_SW("PCM Capture Route", 1, AK4531_LIN_SW1, AK4531_RIN_SW1, 6, 5),
274
275AK4531_DOUBLE("CD Switch", 0, AK4531_LCD, AK4531_RCD, 7, 7, 1, 1),
276AK4531_DOUBLE_TLV("CD Volume", 0, AK4531_LCD, AK4531_RCD, 0, 0, 0x1f, 1,
277		  db_scale_input),
278AK4531_DOUBLE("CD Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 2, 1, 1, 0),
279AK4531_INPUT_SW("CD Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 2, 1),
280
281AK4531_DOUBLE("Line Switch", 0, AK4531_LLINE, AK4531_RLINE, 7, 7, 1, 1),
282AK4531_DOUBLE_TLV("Line Volume", 0, AK4531_LLINE, AK4531_RLINE, 0, 0, 0x1f, 1,
283		  db_scale_input),
284AK4531_DOUBLE("Line Playback Switch", 0, AK4531_OUT_SW1, AK4531_OUT_SW1, 4, 3, 1, 0),
285AK4531_INPUT_SW("Line Capture Route", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 4, 3),
286
287AK4531_DOUBLE("Aux Switch", 0, AK4531_LAUXA, AK4531_RAUXA, 7, 7, 1, 1),
288AK4531_DOUBLE_TLV("Aux Volume", 0, AK4531_LAUXA, AK4531_RAUXA, 0, 0, 0x1f, 1,
289		  db_scale_input),
290AK4531_DOUBLE("Aux Playback Switch", 0, AK4531_OUT_SW2, AK4531_OUT_SW2, 5, 4, 1, 0),
291AK4531_INPUT_SW("Aux Capture Route", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 4, 3),
292
293AK4531_SINGLE("Mono Switch", 0, AK4531_MONO1, 7, 1, 1),
294AK4531_SINGLE_TLV("Mono Volume", 0, AK4531_MONO1, 0, 0x1f, 1, db_scale_input),
295AK4531_SINGLE("Mono Playback Switch", 0, AK4531_OUT_SW2, 0, 1, 0),
296AK4531_DOUBLE("Mono Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 0, 0, 1, 0),
297
298AK4531_SINGLE("Mono Switch", 1, AK4531_MONO2, 7, 1, 1),
299AK4531_SINGLE_TLV("Mono Volume", 1, AK4531_MONO2, 0, 0x1f, 1, db_scale_input),
300AK4531_SINGLE("Mono Playback Switch", 1, AK4531_OUT_SW2, 1, 1, 0),
301AK4531_DOUBLE("Mono Capture Switch", 1, AK4531_LIN_SW2, AK4531_RIN_SW2, 1, 1, 1, 0),
302
303AK4531_SINGLE_TLV("Mic Volume", 0, AK4531_MIC, 0, 0x1f, 1, db_scale_input),
304AK4531_SINGLE("Mic Switch", 0, AK4531_MIC, 7, 1, 1),
305AK4531_SINGLE("Mic Playback Switch", 0, AK4531_OUT_SW1, 0, 1, 0),
306AK4531_DOUBLE("Mic Capture Switch", 0, AK4531_LIN_SW1, AK4531_RIN_SW1, 0, 0, 1, 0),
307
308AK4531_DOUBLE("Mic Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 7, 7, 1, 0),
309AK4531_DOUBLE("Mono1 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 6, 6, 1, 0),
310AK4531_DOUBLE("Mono2 Bypass Capture Switch", 0, AK4531_LIN_SW2, AK4531_RIN_SW2, 5, 5, 1, 0),
311
312AK4531_SINGLE("AD Input Select", 0, AK4531_AD_IN, 0, 1, 0),
313AK4531_SINGLE("Mic Boost (+30dB)", 0, AK4531_MIC_GAIN, 0, 1, 0)
314};
315
316static 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
326static 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
332static 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
361int 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
421void 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
430void 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
451static 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
463static void
464snd_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}