xref: /openbmc/linux/sound/soc/codecs/max98926.c (revision 4f205687)
1 /*
2  * max98926.c -- ALSA SoC MAX98926 driver
3  * Copyright 2013-15 Maxim Integrated Products
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 #include <linux/delay.h>
9 #include <linux/i2c.h>
10 #include <linux/module.h>
11 #include <linux/regmap.h>
12 #include <linux/slab.h>
13 #include <linux/cdev.h>
14 #include <sound/pcm.h>
15 #include <sound/pcm_params.h>
16 #include <sound/soc.h>
17 #include <sound/tlv.h>
18 #include "max98926.h"
19 
20 static const char * const max98926_boost_voltage_txt[] = {
21 	"8.5V", "8.25V", "8.0V", "7.75V", "7.5V", "7.25V", "7.0V", "6.75V",
22 	"6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V", "6.5V"
23 };
24 
25 static const char * const max98926_boost_current_txt[] = {
26 	"0.6", "0.8", "1.0", "1.2", "1.4", "1.6", "1.8", "2.0",
27 	"2.2", "2.4", "2.6", "2.8", "3.2", "3.6", "4.0", "4.4"
28 };
29 
30 static const char *const max98926_dai_txt[] = {
31 	"Left", "Right", "LeftRight", "LeftRightDiv2",
32 };
33 
34 static const char *const max98926_pdm_ch_text[] = {
35 	"Current", "Voltage",
36 };
37 
38 static const char *const max98926_hpf_cutoff_txt[] = {
39 	"Disable", "DC Block", "100Hz",
40 	"200Hz", "400Hz", "800Hz",
41 };
42 
43 static const struct reg_default max98926_reg[] = {
44 	{ 0x0B, 0x00 }, /* IRQ Enable0 */
45 	{ 0x0C, 0x00 }, /* IRQ Enable1 */
46 	{ 0x0D, 0x00 }, /* IRQ Enable2 */
47 	{ 0x0E, 0x00 }, /* IRQ Clear0 */
48 	{ 0x0F, 0x00 }, /* IRQ Clear1 */
49 	{ 0x10, 0x00 }, /* IRQ Clear2 */
50 	{ 0x11, 0xC0 }, /* Map0 */
51 	{ 0x12, 0x00 }, /* Map1 */
52 	{ 0x13, 0x00 }, /* Map2 */
53 	{ 0x14, 0xF0 }, /* Map3 */
54 	{ 0x15, 0x00 }, /* Map4 */
55 	{ 0x16, 0xAB }, /* Map5 */
56 	{ 0x17, 0x89 }, /* Map6 */
57 	{ 0x18, 0x00 }, /* Map7 */
58 	{ 0x19, 0x00 }, /* Map8 */
59 	{ 0x1A, 0x04 }, /* DAI Clock Mode 1 */
60 	{ 0x1B, 0x00 }, /* DAI Clock Mode 2 */
61 	{ 0x1C, 0x00 }, /* DAI Clock Divider Denominator MSBs */
62 	{ 0x1D, 0x00 }, /* DAI Clock Divider Denominator LSBs */
63 	{ 0x1E, 0xF0 }, /* DAI Clock Divider Numerator MSBs */
64 	{ 0x1F, 0x00 }, /* DAI Clock Divider Numerator LSBs */
65 	{ 0x20, 0x50 }, /* Format */
66 	{ 0x21, 0x00 }, /* TDM Slot Select */
67 	{ 0x22, 0x00 }, /* DOUT Configuration VMON */
68 	{ 0x23, 0x00 }, /* DOUT Configuration IMON */
69 	{ 0x24, 0x00 }, /* DOUT Configuration VBAT */
70 	{ 0x25, 0x00 }, /* DOUT Configuration VBST */
71 	{ 0x26, 0x00 }, /* DOUT Configuration FLAG */
72 	{ 0x27, 0xFF }, /* DOUT HiZ Configuration 1 */
73 	{ 0x28, 0xFF }, /* DOUT HiZ Configuration 2 */
74 	{ 0x29, 0xFF }, /* DOUT HiZ Configuration 3 */
75 	{ 0x2A, 0xFF }, /* DOUT HiZ Configuration 4 */
76 	{ 0x2B, 0x02 }, /* DOUT Drive Strength */
77 	{ 0x2C, 0x90 }, /* Filters */
78 	{ 0x2D, 0x00 }, /* Gain */
79 	{ 0x2E, 0x02 }, /* Gain Ramping */
80 	{ 0x2F, 0x00 }, /* Speaker Amplifier */
81 	{ 0x30, 0x0A }, /* Threshold */
82 	{ 0x31, 0x00 }, /* ALC Attack */
83 	{ 0x32, 0x80 }, /* ALC Atten and Release */
84 	{ 0x33, 0x00 }, /* ALC Infinite Hold Release */
85 	{ 0x34, 0x92 }, /* ALC Configuration */
86 	{ 0x35, 0x01 }, /* Boost Converter */
87 	{ 0x36, 0x00 }, /* Block Enable */
88 	{ 0x37, 0x00 }, /* Configuration */
89 	{ 0x38, 0x00 }, /* Global Enable */
90 	{ 0x3A, 0x00 }, /* Boost Limiter */
91 };
92 
93 static const struct soc_enum max98926_voltage_enum[] = {
94 	SOC_ENUM_SINGLE(MAX98926_DAI_CLK_DIV_N_LSBS, 0,
95 		ARRAY_SIZE(max98926_pdm_ch_text),
96 		max98926_pdm_ch_text),
97 };
98 
99 static const struct snd_kcontrol_new max98926_voltage_control =
100 	SOC_DAPM_ENUM("Route", max98926_voltage_enum);
101 
102 static const struct soc_enum max98926_current_enum[] = {
103 	SOC_ENUM_SINGLE(MAX98926_DAI_CLK_DIV_N_LSBS,
104 		MAX98926_PDM_SOURCE_1_SHIFT,
105 		ARRAY_SIZE(max98926_pdm_ch_text),
106 		max98926_pdm_ch_text),
107 };
108 
109 static const struct snd_kcontrol_new max98926_current_control =
110 	SOC_DAPM_ENUM("Route", max98926_current_enum);
111 
112 static const struct snd_kcontrol_new max98926_mixer_controls[] = {
113 	SOC_DAPM_SINGLE("PCM Single Switch", MAX98926_SPK_AMP,
114 		MAX98926_INSELECT_MODE_SHIFT, 0, 0),
115 	SOC_DAPM_SINGLE("PDM Single Switch", MAX98926_SPK_AMP,
116 		MAX98926_INSELECT_MODE_SHIFT, 1, 0),
117 };
118 
119 static const struct snd_kcontrol_new max98926_dai_controls[] = {
120 	SOC_DAPM_SINGLE("Left", MAX98926_GAIN,
121 		MAX98926_DAC_IN_SEL_SHIFT, 0, 0),
122 	SOC_DAPM_SINGLE("Right", MAX98926_GAIN,
123 		MAX98926_DAC_IN_SEL_SHIFT, 1, 0),
124 	SOC_DAPM_SINGLE("LeftRight", MAX98926_GAIN,
125 		MAX98926_DAC_IN_SEL_SHIFT, 2, 0),
126 	SOC_DAPM_SINGLE("(Left+Right)/2 Switch", MAX98926_GAIN,
127 		MAX98926_DAC_IN_SEL_SHIFT, 3, 0),
128 };
129 
130 static const struct snd_soc_dapm_widget max98926_dapm_widgets[] = {
131 	SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0,
132 		SND_SOC_NOPM, 0, 0),
133 	SND_SOC_DAPM_DAC("Amp Enable", NULL, MAX98926_BLOCK_ENABLE,
134 		MAX98926_SPK_EN_SHIFT, 0),
135 	SND_SOC_DAPM_SUPPLY("Global Enable", MAX98926_GLOBAL_ENABLE,
136 		MAX98926_EN_SHIFT, 0, NULL, 0),
137 	SND_SOC_DAPM_SUPPLY("VI Enable", MAX98926_BLOCK_ENABLE,
138 		MAX98926_ADC_IMON_EN_WIDTH |
139 		MAX98926_ADC_VMON_EN_SHIFT,
140 		0, NULL, 0),
141 	SND_SOC_DAPM_PGA("BST Enable", MAX98926_BLOCK_ENABLE,
142 		MAX98926_BST_EN_SHIFT, 0, NULL, 0),
143 	SND_SOC_DAPM_OUTPUT("BE_OUT"),
144 	SND_SOC_DAPM_MIXER("PCM Sel", MAX98926_SPK_AMP,
145 		MAX98926_INSELECT_MODE_SHIFT, 0,
146 		&max98926_mixer_controls[0],
147 		ARRAY_SIZE(max98926_mixer_controls)),
148 	SND_SOC_DAPM_MIXER("DAI Sel",
149 		MAX98926_GAIN, MAX98926_DAC_IN_SEL_SHIFT, 0,
150 		&max98926_dai_controls[0],
151 		ARRAY_SIZE(max98926_dai_controls)),
152 	SND_SOC_DAPM_MUX("PDM CH1 Source",
153 		MAX98926_DAI_CLK_DIV_N_LSBS,
154 		MAX98926_PDM_CURRENT_SHIFT,
155 		0, &max98926_current_control),
156 	SND_SOC_DAPM_MUX("PDM CH0 Source",
157 		MAX98926_DAI_CLK_DIV_N_LSBS,
158 		MAX98926_PDM_VOLTAGE_SHIFT,
159 		0, &max98926_voltage_control),
160 };
161 
162 static const struct snd_soc_dapm_route max98926_audio_map[] = {
163 	{"VI Enable", NULL, "DAI_OUT"},
164 	{"DAI Sel", "Left", "VI Enable"},
165 	{"DAI Sel", "Right", "VI Enable"},
166 	{"DAI Sel", "LeftRight", "VI Enable"},
167 	{"DAI Sel", "LeftRightDiv2", "VI Enable"},
168 	{"PCM Sel", "PCM", "DAI Sel"},
169 
170 	{"PDM CH1 Source", "Current", "DAI_OUT"},
171 	{"PDM CH1 Source", "Voltage", "DAI_OUT"},
172 	{"PDM CH0 Source", "Current", "DAI_OUT"},
173 	{"PDM CH0 Source", "Voltage", "DAI_OUT"},
174 	{"PCM Sel", "Analog", "PDM CH1 Source"},
175 	{"PCM Sel", "Analog", "PDM CH0 Source"},
176 	{"Amp Enable", NULL, "PCM Sel"},
177 
178 	{"BST Enable", NULL, "Amp Enable"},
179 	{"BE_OUT", NULL, "BST Enable"},
180 };
181 
182 static bool max98926_volatile_register(struct device *dev, unsigned int reg)
183 {
184 	switch (reg) {
185 	case MAX98926_VBAT_DATA:
186 	case MAX98926_VBST_DATA:
187 	case MAX98926_LIVE_STATUS0:
188 	case MAX98926_LIVE_STATUS1:
189 	case MAX98926_LIVE_STATUS2:
190 	case MAX98926_STATE0:
191 	case MAX98926_STATE1:
192 	case MAX98926_STATE2:
193 	case MAX98926_FLAG0:
194 	case MAX98926_FLAG1:
195 	case MAX98926_FLAG2:
196 	case MAX98926_VERSION:
197 		return true;
198 	default:
199 		return false;
200 	}
201 }
202 
203 static bool max98926_readable_register(struct device *dev, unsigned int reg)
204 {
205 	switch (reg) {
206 	case MAX98926_IRQ_CLEAR0:
207 	case MAX98926_IRQ_CLEAR1:
208 	case MAX98926_IRQ_CLEAR2:
209 	case MAX98926_ALC_HOLD_RLS:
210 		return false;
211 	default:
212 		return true;
213 	}
214 };
215 
216 DECLARE_TLV_DB_SCALE(max98926_spk_tlv, -600, 100, 0);
217 DECLARE_TLV_DB_RANGE(max98926_current_tlv,
218 	0, 11, TLV_DB_SCALE_ITEM(20, 20, 0),
219 	12, 15, TLV_DB_SCALE_ITEM(320, 40, 0),
220 );
221 
222 static SOC_ENUM_SINGLE_DECL(max98926_dac_hpf_cutoff,
223 		MAX98926_FILTERS, MAX98926_DAC_HPF_SHIFT,
224 		max98926_hpf_cutoff_txt);
225 
226 static SOC_ENUM_SINGLE_DECL(max98926_boost_voltage,
227 		MAX98926_CONFIGURATION, MAX98926_BST_VOUT_SHIFT,
228 		max98926_boost_voltage_txt);
229 
230 static const struct snd_kcontrol_new max98926_snd_controls[] = {
231 	SOC_SINGLE_TLV("Speaker Volume", MAX98926_GAIN,
232 		MAX98926_SPK_GAIN_SHIFT,
233 		(1<<MAX98926_SPK_GAIN_WIDTH)-1, 0,
234 		max98926_spk_tlv),
235 	SOC_SINGLE("Ramp Switch", MAX98926_GAIN_RAMPING,
236 		MAX98926_SPK_RMP_EN_SHIFT, 1, 0),
237 	SOC_SINGLE("ZCD Switch", MAX98926_GAIN_RAMPING,
238 		MAX98926_SPK_ZCD_EN_SHIFT, 1, 0),
239 	SOC_SINGLE("ALC Switch", MAX98926_THRESHOLD,
240 		MAX98926_ALC_EN_SHIFT, 1, 0),
241 	SOC_SINGLE("ALC Threshold", MAX98926_THRESHOLD,
242 		MAX98926_ALC_TH_SHIFT,
243 		(1<<MAX98926_ALC_TH_WIDTH)-1, 0),
244 	SOC_ENUM("Boost Output Voltage", max98926_boost_voltage),
245 	SOC_SINGLE_TLV("Boost Current Limit", MAX98926_BOOST_LIMITER,
246 		MAX98926_BST_ILIM_SHIFT,
247 		(1<<MAX98926_BST_ILIM_SHIFT)-1, 0,
248 		max98926_current_tlv),
249 	SOC_ENUM("DAC HPF Cutoff", max98926_dac_hpf_cutoff),
250 	SOC_DOUBLE("PDM Channel One", MAX98926_DAI_CLK_DIV_N_LSBS,
251 		MAX98926_PDM_CHANNEL_1_SHIFT,
252 		MAX98926_PDM_CHANNEL_1_HIZ, 1, 0),
253 	SOC_DOUBLE("PDM Channel Zero", MAX98926_DAI_CLK_DIV_N_LSBS,
254 		MAX98926_PDM_CHANNEL_0_SHIFT,
255 		MAX98926_PDM_CHANNEL_0_HIZ, 1, 0),
256 };
257 
258 static const struct {
259 	int rate;
260 	int  sr;
261 } rate_table[] = {
262 	{
263 		.rate = 8000,
264 		.sr = 0,
265 	},
266 	{
267 		.rate = 11025,
268 		.sr = 1,
269 	},
270 	{
271 		.rate = 12000,
272 		.sr = 2,
273 	},
274 	{
275 		.rate = 16000,
276 		.sr = 3,
277 	},
278 	{
279 		.rate = 22050,
280 		.sr = 4,
281 	},
282 	{
283 		.rate = 24000,
284 		.sr = 5,
285 	},
286 	{
287 		.rate = 32000,
288 		.sr = 6,
289 	},
290 	{
291 		.rate = 44100,
292 		.sr = 7,
293 	},
294 	{
295 		.rate = 48000,
296 		.sr = 8,
297 	},
298 };
299 
300 static void max98926_set_sense_data(struct max98926_priv *max98926)
301 {
302 	regmap_update_bits(max98926->regmap,
303 		MAX98926_DOUT_CFG_VMON,
304 		MAX98926_DAI_VMON_EN_MASK,
305 		MAX98926_DAI_VMON_EN_MASK);
306 	regmap_update_bits(max98926->regmap,
307 		MAX98926_DOUT_CFG_IMON,
308 		MAX98926_DAI_IMON_EN_MASK,
309 		MAX98926_DAI_IMON_EN_MASK);
310 
311 	if (!max98926->interleave_mode) {
312 		/* set VMON slots */
313 		regmap_update_bits(max98926->regmap,
314 			MAX98926_DOUT_CFG_VMON,
315 			MAX98926_DAI_VMON_SLOT_MASK,
316 			max98926->v_slot);
317 		/* set IMON slots */
318 		regmap_update_bits(max98926->regmap,
319 			MAX98926_DOUT_CFG_IMON,
320 			MAX98926_DAI_IMON_SLOT_MASK,
321 			max98926->i_slot);
322 	} else {
323 		/* enable interleave mode */
324 		regmap_update_bits(max98926->regmap,
325 			MAX98926_FORMAT,
326 			MAX98926_DAI_INTERLEAVE_MASK,
327 			MAX98926_DAI_INTERLEAVE_MASK);
328 		/* set interleave slots */
329 		regmap_update_bits(max98926->regmap,
330 			MAX98926_DOUT_CFG_VBAT,
331 			MAX98926_DAI_INTERLEAVE_SLOT_MASK,
332 			max98926->v_slot);
333 	}
334 }
335 
336 static int max98926_dai_set_fmt(struct snd_soc_dai *codec_dai,
337 		unsigned int fmt)
338 {
339 	struct snd_soc_codec *codec = codec_dai->codec;
340 	struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
341 	unsigned int invert = 0;
342 
343 	dev_dbg(codec->dev, "%s: fmt 0x%08X\n", __func__, fmt);
344 
345 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
346 	case SND_SOC_DAIFMT_CBS_CFS:
347 		max98926_set_sense_data(max98926);
348 		break;
349 	default:
350 		dev_err(codec->dev, "DAI clock mode unsupported");
351 		return -EINVAL;
352 	}
353 
354 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
355 	case SND_SOC_DAIFMT_NB_NF:
356 		break;
357 	case SND_SOC_DAIFMT_NB_IF:
358 		invert = MAX98926_DAI_WCI_MASK;
359 		break;
360 	case SND_SOC_DAIFMT_IB_NF:
361 		invert = MAX98926_DAI_BCI_MASK;
362 		break;
363 	case SND_SOC_DAIFMT_IB_IF:
364 		invert = MAX98926_DAI_BCI_MASK | MAX98926_DAI_WCI_MASK;
365 		break;
366 	default:
367 		dev_err(codec->dev, "DAI invert mode unsupported");
368 		return -EINVAL;
369 	}
370 
371 	regmap_write(max98926->regmap,
372 			MAX98926_FORMAT, MAX98926_DAI_DLY_MASK);
373 	regmap_update_bits(max98926->regmap, MAX98926_FORMAT,
374 			MAX98926_DAI_BCI_MASK, invert);
375 	return 0;
376 }
377 
378 static int max98926_dai_hw_params(struct snd_pcm_substream *substream,
379 		struct snd_pcm_hw_params *params,
380 		struct snd_soc_dai *dai)
381 {
382 	int dai_sr = -EINVAL;
383 	int rate = params_rate(params), i;
384 	struct snd_soc_codec *codec = dai->codec;
385 	struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
386 	int blr_clk_ratio;
387 
388 	switch (params_format(params)) {
389 	case SNDRV_PCM_FORMAT_S16_LE:
390 		regmap_update_bits(max98926->regmap,
391 			MAX98926_FORMAT,
392 			MAX98926_DAI_CHANSZ_MASK,
393 			MAX98926_DAI_CHANSZ_16);
394 		max98926->ch_size = 16;
395 		break;
396 	case SNDRV_PCM_FORMAT_S24_LE:
397 		regmap_update_bits(max98926->regmap,
398 			MAX98926_FORMAT,
399 			MAX98926_DAI_CHANSZ_MASK,
400 			MAX98926_DAI_CHANSZ_24);
401 		max98926->ch_size = 24;
402 		break;
403 	case SNDRV_PCM_FORMAT_S32_LE:
404 		regmap_update_bits(max98926->regmap,
405 			MAX98926_FORMAT,
406 			MAX98926_DAI_CHANSZ_MASK,
407 			MAX98926_DAI_CHANSZ_32);
408 		max98926->ch_size = 32;
409 		break;
410 	default:
411 		dev_dbg(codec->dev, "format unsupported %d",
412 			params_format(params));
413 		return -EINVAL;
414 	}
415 
416 	/* BCLK/LRCLK ratio calculation */
417 	blr_clk_ratio = params_channels(params) * max98926->ch_size;
418 
419 	switch (blr_clk_ratio) {
420 	case 32:
421 		regmap_update_bits(max98926->regmap,
422 			MAX98926_DAI_CLK_MODE2,
423 			MAX98926_DAI_BSEL_MASK,
424 			MAX98926_DAI_BSEL_32);
425 		break;
426 	case 48:
427 		regmap_update_bits(max98926->regmap,
428 			MAX98926_DAI_CLK_MODE2,
429 			MAX98926_DAI_BSEL_MASK,
430 			MAX98926_DAI_BSEL_48);
431 		break;
432 	case 64:
433 		regmap_update_bits(max98926->regmap,
434 			MAX98926_DAI_CLK_MODE2,
435 			MAX98926_DAI_BSEL_MASK,
436 			MAX98926_DAI_BSEL_64);
437 		break;
438 	default:
439 		return -EINVAL;
440 	}
441 
442 	/* find the closest rate */
443 	for (i = 0; i < ARRAY_SIZE(rate_table); i++) {
444 		if (rate_table[i].rate >= rate) {
445 			dai_sr = rate_table[i].sr;
446 			break;
447 		}
448 	}
449 	if (dai_sr < 0)
450 		return -EINVAL;
451 
452 	/* set DAI_SR to correct LRCLK frequency */
453 	regmap_update_bits(max98926->regmap,
454 		MAX98926_DAI_CLK_MODE2,
455 		MAX98926_DAI_SR_MASK, dai_sr << MAX98926_DAI_SR_SHIFT);
456 	return 0;
457 }
458 
459 #define MAX98926_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
460 		SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
461 
462 static struct snd_soc_dai_ops max98926_dai_ops = {
463 	.set_fmt = max98926_dai_set_fmt,
464 	.hw_params = max98926_dai_hw_params,
465 };
466 
467 static struct snd_soc_dai_driver max98926_dai[] = {
468 {
469 	.name = "max98926-aif1",
470 	.playback = {
471 		.stream_name = "HiFi Playback",
472 		.channels_min = 1,
473 		.channels_max = 2,
474 		.rates = SNDRV_PCM_RATE_8000_48000,
475 		.formats = MAX98926_FORMATS,
476 	},
477 	.capture = {
478 		.stream_name = "HiFi Capture",
479 		.channels_min = 1,
480 		.channels_max = 2,
481 		.rates = SNDRV_PCM_RATE_8000_48000,
482 		.formats = MAX98926_FORMATS,
483 	},
484 	.ops = &max98926_dai_ops,
485 }
486 };
487 
488 static int max98926_probe(struct snd_soc_codec *codec)
489 {
490 	struct max98926_priv *max98926 = snd_soc_codec_get_drvdata(codec);
491 
492 	max98926->codec = codec;
493 	codec->control_data = max98926->regmap;
494 	/* Hi-Z all the slots */
495 	regmap_write(max98926->regmap, MAX98926_DOUT_HIZ_CFG4, 0xF0);
496 	return 0;
497 }
498 
499 static struct snd_soc_codec_driver soc_codec_dev_max98926 = {
500 	.probe	= max98926_probe,
501 	.controls = max98926_snd_controls,
502 	.num_controls = ARRAY_SIZE(max98926_snd_controls),
503 	.dapm_routes = max98926_audio_map,
504 	.num_dapm_routes = ARRAY_SIZE(max98926_audio_map),
505 	.dapm_widgets = max98926_dapm_widgets,
506 	.num_dapm_widgets = ARRAY_SIZE(max98926_dapm_widgets),
507 };
508 
509 static const struct regmap_config max98926_regmap = {
510 	.reg_bits	= 8,
511 	.val_bits	= 8,
512 	.max_register	= MAX98926_VERSION,
513 	.reg_defaults	= max98926_reg,
514 	.num_reg_defaults = ARRAY_SIZE(max98926_reg),
515 	.volatile_reg	= max98926_volatile_register,
516 	.readable_reg	= max98926_readable_register,
517 	.cache_type		= REGCACHE_RBTREE,
518 };
519 
520 static int max98926_i2c_probe(struct i2c_client *i2c,
521 		const struct i2c_device_id *id)
522 {
523 	int ret, reg;
524 	u32 value;
525 	struct max98926_priv *max98926;
526 
527 	max98926 = devm_kzalloc(&i2c->dev,
528 			sizeof(*max98926), GFP_KERNEL);
529 	if (!max98926)
530 		return -ENOMEM;
531 
532 	i2c_set_clientdata(i2c, max98926);
533 	max98926->regmap = devm_regmap_init_i2c(i2c, &max98926_regmap);
534 	if (IS_ERR(max98926->regmap)) {
535 		ret = PTR_ERR(max98926->regmap);
536 		dev_err(&i2c->dev,
537 				"Failed to allocate regmap: %d\n", ret);
538 		goto err_out;
539 	}
540 	if (of_property_read_bool(i2c->dev.of_node, "interleave-mode"))
541 		max98926->interleave_mode = true;
542 
543 	if (!of_property_read_u32(i2c->dev.of_node, "vmon-slot-no", &value)) {
544 		if (value > MAX98926_DAI_VMON_SLOT_1E_1F) {
545 			dev_err(&i2c->dev, "vmon slot number is wrong:\n");
546 			return -EINVAL;
547 		}
548 		max98926->v_slot = value;
549 	}
550 	if (!of_property_read_u32(i2c->dev.of_node, "imon-slot-no", &value)) {
551 		if (value > MAX98926_DAI_IMON_SLOT_1E_1F) {
552 			dev_err(&i2c->dev, "imon slot number is wrong:\n");
553 			return -EINVAL;
554 		}
555 		max98926->i_slot = value;
556 	}
557 	ret = regmap_read(max98926->regmap,
558 			MAX98926_VERSION, &reg);
559 	if (ret < 0) {
560 		dev_err(&i2c->dev, "Failed to read: %x\n", reg);
561 		return ret;
562 	}
563 
564 	ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_max98926,
565 			max98926_dai, ARRAY_SIZE(max98926_dai));
566 	if (ret < 0)
567 		dev_err(&i2c->dev,
568 				"Failed to register codec: %d\n", ret);
569 	dev_info(&i2c->dev, "device version: %x\n", reg);
570 err_out:
571 	return ret;
572 }
573 
574 static int max98926_i2c_remove(struct i2c_client *client)
575 {
576 	snd_soc_unregister_codec(&client->dev);
577 	return 0;
578 }
579 
580 static const struct i2c_device_id max98926_i2c_id[] = {
581 	{ "max98926", 0 },
582 	{ }
583 };
584 MODULE_DEVICE_TABLE(i2c, max98926_i2c_id);
585 
586 static const struct of_device_id max98926_of_match[] = {
587 	{ .compatible = "maxim,max98926", },
588 	{ }
589 };
590 MODULE_DEVICE_TABLE(of, max98926_of_match);
591 
592 static struct i2c_driver max98926_i2c_driver = {
593 	.driver = {
594 		.name = "max98926",
595 		.of_match_table = of_match_ptr(max98926_of_match),
596 		.pm = NULL,
597 	},
598 	.probe	= max98926_i2c_probe,
599 	.remove = max98926_i2c_remove,
600 	.id_table = max98926_i2c_id,
601 };
602 
603 module_i2c_driver(max98926_i2c_driver)
604 MODULE_DESCRIPTION("ALSA SoC MAX98926 driver");
605 MODULE_AUTHOR("Anish kumar <anish.kumar@maximintegrated.com>");
606 MODULE_LICENSE("GPL");
607