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1 /*
2  * max9867.c -- max9867 ALSA SoC Audio driver
3  *
4  * Copyright 2013-15 Maxim Integrated Products
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 version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/delay.h>
12 #include <linux/i2c.h>
13 #include <linux/module.h>
14 #include <linux/regmap.h>
15 #include <sound/pcm_params.h>
16 #include <sound/soc.h>
17 #include <sound/tlv.h>
18 #include "max9867.h"
19 
20 static const char *const max9867_spmode[] = {
21 	"Stereo Diff", "Mono Diff",
22 	"Stereo Cap", "Mono Cap",
23 	"Stereo Single", "Mono Single",
24 	"Stereo Single Fast", "Mono Single Fast"
25 };
26 static const char *const max9867_sidetone_text[] = {
27 	"None", "Left", "Right", "LeftRight", "LeftRightDiv2",
28 };
29 static const char *const max9867_filter_text[] = {"IIR", "FIR"};
30 
31 static SOC_ENUM_SINGLE_DECL(max9867_filter, MAX9867_CODECFLTR, 7,
32 	max9867_filter_text);
33 static SOC_ENUM_SINGLE_DECL(max9867_spkmode, MAX9867_MODECONFIG, 0,
34 	max9867_spmode);
35 static SOC_ENUM_SINGLE_DECL(max9867_sidetone, MAX9867_DACGAIN, 6,
36 	max9867_sidetone_text);
37 static DECLARE_TLV_DB_SCALE(max9860_capture_tlv, -600, 200, 0);
38 static DECLARE_TLV_DB_SCALE(max9860_mic_tlv, 2000, 100, 1);
39 static DECLARE_TLV_DB_SCALE(max9860_adc_left_tlv, -1200, 100, 1);
40 static DECLARE_TLV_DB_SCALE(max9860_adc_right_tlv, -1200, 100, 1);
41 static const SNDRV_CTL_TLVD_DECLARE_DB_RANGE(max98088_micboost_tlv,
42 	0, 1, TLV_DB_SCALE_ITEM(0, 2000, 0),
43 	2, 2, TLV_DB_SCALE_ITEM(3000, 0, 0),
44 );
45 
46 static const struct snd_kcontrol_new max9867_snd_controls[] = {
47 	SOC_DOUBLE_R("Master Playback Volume", MAX9867_LEFTVOL,
48 				MAX9867_RIGHTVOL, 0, 63, 1),
49 	SOC_DOUBLE_R_TLV("Capture Volume", MAX9867_LEFTMICGAIN,
50 			MAX9867_RIGHTMICGAIN,
51 			0, 15, 1, max9860_capture_tlv),
52 	SOC_DOUBLE_R_TLV("Mic Volume", MAX9867_LEFTMICGAIN,
53 			MAX9867_RIGHTMICGAIN, 0, 31, 1, max9860_mic_tlv),
54 	SOC_DOUBLE_R_TLV("Mic Boost Volume", MAX9867_LEFTMICGAIN,
55 			MAX9867_RIGHTMICGAIN, 5, 3, 0, max98088_micboost_tlv),
56 	SOC_ENUM("Digital Sidetone Src", max9867_sidetone),
57 	SOC_SINGLE("Sidetone Volume", MAX9867_DACGAIN, 0, 31, 1),
58 	SOC_SINGLE("DAC Volume", MAX9867_DACLEVEL, 4, 3, 0),
59 	SOC_SINGLE("DAC Attenuation", MAX9867_DACLEVEL, 0, 15, 1),
60 	SOC_SINGLE_TLV("ADC Left Volume", MAX9867_ADCLEVEL,
61 			4, 15, 1, max9860_adc_left_tlv),
62 	SOC_SINGLE_TLV("ADC Right Volume", MAX9867_ADCLEVEL,
63 			0, 15, 1, max9860_adc_right_tlv),
64 	SOC_ENUM("Speaker Mode", max9867_spkmode),
65 	SOC_SINGLE("Volume Smoothing Switch", MAX9867_MODECONFIG, 6, 1, 0),
66 	SOC_SINGLE("ZCD Switch", MAX9867_MODECONFIG, 5, 1, 0),
67 	SOC_ENUM("DSP Filter", max9867_filter),
68 };
69 
70 static const char *const max9867_mux[] = {"None", "Mic", "Line", "Mic_Line"};
71 
72 static SOC_ENUM_SINGLE_DECL(max9867_mux_enum,
73 	MAX9867_INPUTCONFIG, MAX9867_INPUT_SHIFT,
74 	max9867_mux);
75 
76 static const struct snd_kcontrol_new max9867_dapm_mux_controls =
77 	SOC_DAPM_ENUM("Route", max9867_mux_enum);
78 
79 static const struct snd_kcontrol_new max9867_left_dapm_control =
80 	SOC_DAPM_SINGLE("Switch", MAX9867_PWRMAN, 6, 1, 0);
81 static const struct snd_kcontrol_new max9867_right_dapm_control =
82 	SOC_DAPM_SINGLE("Switch", MAX9867_PWRMAN, 5, 1, 0);
83 static const struct snd_kcontrol_new max9867_line_dapm_control =
84 	SOC_DAPM_SINGLE("Switch", MAX9867_LEFTLINELVL, 6, 1, 1);
85 
86 static const struct snd_soc_dapm_widget max9867_dapm_widgets[] = {
87 	SND_SOC_DAPM_AIF_IN("DAI_OUT", "HiFi Playback", 0, SND_SOC_NOPM, 0, 0),
88 	SND_SOC_DAPM_DAC("Left DAC", NULL, MAX9867_PWRMAN, 3, 0),
89 	SND_SOC_DAPM_DAC("Right DAC", NULL, MAX9867_PWRMAN, 2, 0),
90 	SND_SOC_DAPM_MIXER("Output Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
91 	SND_SOC_DAPM_OUTPUT("HPOUT"),
92 
93 	SND_SOC_DAPM_AIF_IN("DAI_IN", "HiFi Capture", 0, SND_SOC_NOPM, 0, 0),
94 	SND_SOC_DAPM_ADC("Left ADC", "HiFi Capture", MAX9867_PWRMAN, 1, 0),
95 	SND_SOC_DAPM_ADC("Right ADC", "HiFi Capture", MAX9867_PWRMAN, 0, 0),
96 	SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
97 		&max9867_dapm_mux_controls),
98 
99 	SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
100 	SND_SOC_DAPM_SWITCH("Left Line", MAX9867_LEFTLINELVL, 6, 1,
101 		&max9867_left_dapm_control),
102 	SND_SOC_DAPM_SWITCH("Right Line", MAX9867_RIGTHLINELVL, 6, 1,
103 		&max9867_right_dapm_control),
104 	SND_SOC_DAPM_SWITCH("Line Mixer", SND_SOC_NOPM, 0, 0,
105 		&max9867_line_dapm_control),
106 	SND_SOC_DAPM_INPUT("LINE_IN"),
107 };
108 
109 static const struct snd_soc_dapm_route max9867_audio_map[] = {
110 	{"Left DAC", NULL, "DAI_OUT"},
111 	{"Right DAC", NULL, "DAI_OUT"},
112 	{"Output Mixer", NULL, "Left DAC"},
113 	{"Output Mixer", NULL, "Right DAC"},
114 	{"HPOUT", NULL, "Output Mixer"},
115 
116 	{"Left ADC", NULL, "DAI_IN"},
117 	{"Right ADC", NULL, "DAI_IN"},
118 	{"Input Mixer", NULL, "Left ADC"},
119 	{"Input Mixer", NULL, "Right ADC"},
120 	{"Input Mux", "Line", "Input Mixer"},
121 	{"Input Mux", "Mic", "Input Mixer"},
122 	{"Input Mux", "Mic_Line", "Input Mixer"},
123 	{"Right Line", "Switch", "Input Mux"},
124 	{"Left Line", "Switch", "Input Mux"},
125 	{"LINE_IN", NULL, "Left Line"},
126 	{"LINE_IN", NULL, "Right Line"},
127 };
128 
129 enum rates {
130 	pcm_rate_8, pcm_rate_16, pcm_rate_24,
131 	pcm_rate_32, pcm_rate_44,
132 	pcm_rate_48, max_pcm_rate,
133 };
134 
135 static const struct ni_div_rates {
136 	u32 mclk;
137 	u16 ni[max_pcm_rate];
138 } ni_div[] = {
139 	{11289600, {0x116A, 0x22D4, 0x343F, 0x45A9, 0x6000, 0x687D} },
140 	{12000000, {0x1062, 0x20C5, 0x3127, 0x4189, 0x5A51, 0x624E} },
141 	{12288000, {0x1000, 0x2000, 0x3000, 0x4000, 0x5833, 0x6000} },
142 	{13000000, {0x0F20, 0x1E3F, 0x2D5F, 0x3C7F, 0x535F, 0x5ABE} },
143 	{19200000, {0x0A3D, 0x147B, 0x1EB8, 0x28F6, 0x3873, 0x3D71} },
144 	{24000000, {0x1062, 0x20C5, 0x1893, 0x4189, 0x5A51, 0x624E} },
145 	{26000000, {0x0F20, 0x1E3F, 0x16AF, 0x3C7F, 0x535F, 0x5ABE} },
146 	{27000000, {0x0E90, 0x1D21, 0x15D8, 0x3A41, 0x5048, 0x5762} },
147 };
148 
get_ni_value(int mclk,int rate)149 static inline int get_ni_value(int mclk, int rate)
150 {
151 	int i, ret = 0;
152 
153 	/* find the closest rate index*/
154 	for (i = 0; i < ARRAY_SIZE(ni_div); i++) {
155 		if (ni_div[i].mclk >= mclk)
156 			break;
157 	}
158 	if (i == ARRAY_SIZE(ni_div))
159 		return -EINVAL;
160 
161 	switch (rate) {
162 	case 8000:
163 		return ni_div[i].ni[pcm_rate_8];
164 	case 16000:
165 		return ni_div[i].ni[pcm_rate_16];
166 	case 32000:
167 		return ni_div[i].ni[pcm_rate_32];
168 	case 44100:
169 		return ni_div[i].ni[pcm_rate_44];
170 	case 48000:
171 		return ni_div[i].ni[pcm_rate_48];
172 	default:
173 		pr_err("%s wrong rate %d\n", __func__, rate);
174 		ret = -EINVAL;
175 	}
176 	return ret;
177 }
178 
max9867_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)179 static int max9867_dai_hw_params(struct snd_pcm_substream *substream,
180 		struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
181 {
182 	struct snd_soc_component *component = dai->component;
183 	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
184 	unsigned int ni_h, ni_l;
185 	int value;
186 
187 	value = get_ni_value(max9867->sysclk, params_rate(params));
188 	if (value < 0)
189 		return value;
190 
191 	ni_h = (0xFF00 & value) >> 8;
192 	ni_l = 0x00FF & value;
193 	/* set up the ni value */
194 	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
195 		MAX9867_NI_HIGH_MASK, ni_h);
196 	regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
197 		MAX9867_NI_LOW_MASK, ni_l);
198 	if (!max9867->master) {
199 		/*
200 		 * digital pll locks on to any externally supplied LRCLK signal
201 		 * and also enable rapid lock mode.
202 		 */
203 		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKLOW,
204 			MAX9867_RAPID_LOCK, MAX9867_RAPID_LOCK);
205 		regmap_update_bits(max9867->regmap, MAX9867_AUDIOCLKHIGH,
206 			MAX9867_PLL, MAX9867_PLL);
207 	} else {
208 		unsigned long int bclk_rate, pclk_bclk_ratio;
209 		int bclk_value;
210 
211 		bclk_rate = params_rate(params) * 2 * params_width(params);
212 		pclk_bclk_ratio = max9867->pclk/bclk_rate;
213 		switch (params_width(params)) {
214 		case 8:
215 		case 16:
216 			switch (pclk_bclk_ratio) {
217 			case 2:
218 				bclk_value = MAX9867_IFC1B_PCLK_2;
219 				break;
220 			case 4:
221 				bclk_value = MAX9867_IFC1B_PCLK_4;
222 				break;
223 			case 8:
224 				bclk_value = MAX9867_IFC1B_PCLK_8;
225 				break;
226 			case 16:
227 				bclk_value = MAX9867_IFC1B_PCLK_16;
228 				break;
229 			default:
230 				dev_err(component->dev,
231 					"unsupported sampling rate\n");
232 				return -EINVAL;
233 			}
234 			break;
235 		case 24:
236 			bclk_value = MAX9867_IFC1B_24BIT;
237 			break;
238 		case 32:
239 			bclk_value = MAX9867_IFC1B_32BIT;
240 			break;
241 		default:
242 			dev_err(component->dev, "unsupported sampling rate\n");
243 			return -EINVAL;
244 		}
245 		regmap_update_bits(max9867->regmap, MAX9867_IFC1B,
246 			MAX9867_IFC1B_BCLK_MASK, bclk_value);
247 	}
248 	return 0;
249 }
250 
max9867_mute(struct snd_soc_dai * dai,int mute)251 static int max9867_mute(struct snd_soc_dai *dai, int mute)
252 {
253 	struct snd_soc_component *component = dai->component;
254 	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
255 
256 	if (mute)
257 		regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
258 			MAX9867_DAC_MUTE_MASK, MAX9867_DAC_MUTE_MASK);
259 	else
260 		regmap_update_bits(max9867->regmap, MAX9867_DACLEVEL,
261 			MAX9867_DAC_MUTE_MASK, 0);
262 	return 0;
263 }
264 
max9867_set_dai_sysclk(struct snd_soc_dai * codec_dai,int clk_id,unsigned int freq,int dir)265 static int max9867_set_dai_sysclk(struct snd_soc_dai *codec_dai,
266 		int clk_id, unsigned int freq, int dir)
267 {
268 	struct snd_soc_component *component = codec_dai->component;
269 	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
270 	int value = 0;
271 
272 	/* Set the prescaler based on the master clock frequency*/
273 	if (freq >= 10000000 && freq <= 20000000) {
274 		value |= MAX9867_PSCLK_10_20;
275 		max9867->pclk =  freq;
276 	} else if (freq >= 20000000 && freq <= 40000000) {
277 		value |= MAX9867_PSCLK_20_40;
278 		max9867->pclk =  freq/2;
279 	} else if (freq >= 40000000 && freq <= 60000000) {
280 		value |= MAX9867_PSCLK_40_60;
281 		max9867->pclk =  freq/4;
282 	} else {
283 		dev_err(component->dev,
284 			"Invalid clock frequency %uHz (required 10-60MHz)\n",
285 			freq);
286 		return -EINVAL;
287 	}
288 	value = value << MAX9867_PSCLK_SHIFT;
289 	max9867->sysclk = freq;
290 	/* exact integer mode is not supported */
291 	value &= ~MAX9867_FREQ_MASK;
292 	regmap_update_bits(max9867->regmap, MAX9867_SYSCLK,
293 			MAX9867_PSCLK_MASK, value);
294 	return 0;
295 }
296 
max9867_dai_set_fmt(struct snd_soc_dai * codec_dai,unsigned int fmt)297 static int max9867_dai_set_fmt(struct snd_soc_dai *codec_dai,
298 		unsigned int fmt)
299 {
300 	struct snd_soc_component *component = codec_dai->component;
301 	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
302 	u8 iface1A = 0, iface1B = 0;
303 
304 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
305 	case SND_SOC_DAIFMT_CBM_CFM:
306 		max9867->master = 1;
307 		iface1A |= MAX9867_MASTER;
308 		break;
309 	case SND_SOC_DAIFMT_CBS_CFS:
310 		max9867->master = 0;
311 		iface1A &= ~MAX9867_MASTER;
312 		break;
313 	default:
314 		return -EINVAL;
315 	}
316 
317 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
318 	case SND_SOC_DAIFMT_I2S:
319 		iface1A |= MAX9867_I2S_DLY;
320 		break;
321 	case SND_SOC_DAIFMT_DSP_A:
322 		iface1A |= MAX9867_TDM_MODE | MAX9867_SDOUT_HIZ;
323 		break;
324 	default:
325 		return -EINVAL;
326 	}
327 
328 	/* Clock inversion bits, BCI and WCI */
329 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
330 	case SND_SOC_DAIFMT_NB_NF:
331 		break;
332 	case SND_SOC_DAIFMT_IB_IF:
333 		iface1A |= MAX9867_WCI_MODE | MAX9867_BCI_MODE;
334 		break;
335 	case SND_SOC_DAIFMT_IB_NF:
336 		iface1A |= MAX9867_BCI_MODE;
337 		break;
338 	case SND_SOC_DAIFMT_NB_IF:
339 		iface1A |= MAX9867_WCI_MODE;
340 		break;
341 	default:
342 		return -EINVAL;
343 	}
344 
345 	regmap_write(max9867->regmap, MAX9867_IFC1A, iface1A);
346 	regmap_write(max9867->regmap, MAX9867_IFC1B, iface1B);
347 	return 0;
348 }
349 
350 static const struct snd_soc_dai_ops max9867_dai_ops = {
351 	.set_fmt = max9867_dai_set_fmt,
352 	.set_sysclk	= max9867_set_dai_sysclk,
353 	.digital_mute	= max9867_mute,
354 	.hw_params = max9867_dai_hw_params,
355 };
356 
357 #define MAX9867_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
358 	SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
359 #define MAX9867_FORMATS (SNDRV_PCM_FMTBIT_S16_LE)
360 
361 static struct snd_soc_dai_driver max9867_dai[] = {
362 	{
363 	.name = "max9867-aif1",
364 	.playback = {
365 		.stream_name = "HiFi Playback",
366 		.channels_min = 2,
367 		.channels_max = 2,
368 		.rates = MAX9867_RATES,
369 		.formats = MAX9867_FORMATS,
370 	},
371 	.capture = {
372 		.stream_name = "HiFi Capture",
373 		.channels_min = 2,
374 		.channels_max = 2,
375 		.rates = MAX9867_RATES,
376 		.formats = MAX9867_FORMATS,
377 	},
378 	.ops = &max9867_dai_ops,
379 	.symmetric_rates = 1,
380 	}
381 };
382 
383 #ifdef CONFIG_PM
max9867_suspend(struct snd_soc_component * component)384 static int max9867_suspend(struct snd_soc_component *component)
385 {
386 	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_OFF);
387 
388 	return 0;
389 }
390 
max9867_resume(struct snd_soc_component * component)391 static int max9867_resume(struct snd_soc_component *component)
392 {
393 	snd_soc_component_force_bias_level(component, SND_SOC_BIAS_STANDBY);
394 
395 	return 0;
396 }
397 #else
398 #define max9867_suspend	NULL
399 #define max9867_resume	NULL
400 #endif
401 
max9867_set_bias_level(struct snd_soc_component * component,enum snd_soc_bias_level level)402 static int max9867_set_bias_level(struct snd_soc_component *component,
403 				  enum snd_soc_bias_level level)
404 {
405 	int err;
406 	struct max9867_priv *max9867 = snd_soc_component_get_drvdata(component);
407 
408 	switch (level) {
409 	case SND_SOC_BIAS_STANDBY:
410 		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
411 			err = regcache_sync(max9867->regmap);
412 			if (err)
413 				return err;
414 
415 			err = regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
416 						 MAX9867_SHTDOWN, MAX9867_SHTDOWN);
417 			if (err)
418 				return err;
419 		}
420 		break;
421 	case SND_SOC_BIAS_OFF:
422 		err = regmap_update_bits(max9867->regmap, MAX9867_PWRMAN,
423 					 MAX9867_SHTDOWN, 0);
424 		if (err)
425 			return err;
426 
427 		regcache_mark_dirty(max9867->regmap);
428 		break;
429 	default:
430 		break;
431 	}
432 
433 	return 0;
434 }
435 
436 static const struct snd_soc_component_driver max9867_component = {
437 	.controls		= max9867_snd_controls,
438 	.num_controls		= ARRAY_SIZE(max9867_snd_controls),
439 	.dapm_routes		= max9867_audio_map,
440 	.num_dapm_routes	= ARRAY_SIZE(max9867_audio_map),
441 	.dapm_widgets		= max9867_dapm_widgets,
442 	.num_dapm_widgets	= ARRAY_SIZE(max9867_dapm_widgets),
443 	.suspend		= max9867_suspend,
444 	.resume			= max9867_resume,
445 	.set_bias_level		= max9867_set_bias_level,
446 	.idle_bias_on		= 1,
447 	.use_pmdown_time	= 1,
448 	.endianness		= 1,
449 	.non_legacy_dai_naming	= 1,
450 };
451 
max9867_volatile_register(struct device * dev,unsigned int reg)452 static bool max9867_volatile_register(struct device *dev, unsigned int reg)
453 {
454 	switch (reg) {
455 	case MAX9867_STATUS:
456 	case MAX9867_JACKSTATUS:
457 	case MAX9867_AUXHIGH:
458 	case MAX9867_AUXLOW:
459 		return true;
460 	default:
461 		return false;
462 	}
463 }
464 
465 static const struct reg_default max9867_reg[] = {
466 	{ 0x04, 0x00 },
467 	{ 0x05, 0x00 },
468 	{ 0x06, 0x00 },
469 	{ 0x07, 0x00 },
470 	{ 0x08, 0x00 },
471 	{ 0x09, 0x00 },
472 	{ 0x0A, 0x00 },
473 	{ 0x0B, 0x00 },
474 	{ 0x0C, 0x00 },
475 	{ 0x0D, 0x00 },
476 	{ 0x0E, 0x00 },
477 	{ 0x0F, 0x00 },
478 	{ 0x10, 0x00 },
479 	{ 0x11, 0x00 },
480 	{ 0x12, 0x00 },
481 	{ 0x13, 0x00 },
482 	{ 0x14, 0x00 },
483 	{ 0x15, 0x00 },
484 	{ 0x16, 0x00 },
485 	{ 0x17, 0x00 },
486 };
487 
488 static const struct regmap_config max9867_regmap = {
489 	.reg_bits	= 8,
490 	.val_bits	= 8,
491 	.max_register	= MAX9867_REVISION,
492 	.reg_defaults	= max9867_reg,
493 	.num_reg_defaults = ARRAY_SIZE(max9867_reg),
494 	.volatile_reg	= max9867_volatile_register,
495 	.cache_type	= REGCACHE_RBTREE,
496 };
497 
max9867_i2c_probe(struct i2c_client * i2c,const struct i2c_device_id * id)498 static int max9867_i2c_probe(struct i2c_client *i2c,
499 		const struct i2c_device_id *id)
500 {
501 	struct max9867_priv *max9867;
502 	int ret = 0, reg;
503 
504 	max9867 = devm_kzalloc(&i2c->dev,
505 			sizeof(*max9867), GFP_KERNEL);
506 	if (!max9867)
507 		return -ENOMEM;
508 
509 	i2c_set_clientdata(i2c, max9867);
510 	max9867->regmap = devm_regmap_init_i2c(i2c, &max9867_regmap);
511 	if (IS_ERR(max9867->regmap)) {
512 		ret = PTR_ERR(max9867->regmap);
513 		dev_err(&i2c->dev, "Failed to allocate regmap: %d\n", ret);
514 		return ret;
515 	}
516 	ret = regmap_read(max9867->regmap,
517 			MAX9867_REVISION, &reg);
518 	if (ret < 0) {
519 		dev_err(&i2c->dev, "Failed to read: %d\n", ret);
520 		return ret;
521 	}
522 	dev_info(&i2c->dev, "device revision: %x\n", reg);
523 	ret = devm_snd_soc_register_component(&i2c->dev, &max9867_component,
524 			max9867_dai, ARRAY_SIZE(max9867_dai));
525 	if (ret < 0) {
526 		dev_err(&i2c->dev, "Failed to register component: %d\n", ret);
527 		return ret;
528 	}
529 	return ret;
530 }
531 
532 static const struct i2c_device_id max9867_i2c_id[] = {
533 	{ "max9867", 0 },
534 	{ }
535 };
536 MODULE_DEVICE_TABLE(i2c, max9867_i2c_id);
537 
538 static const struct of_device_id max9867_of_match[] = {
539 	{ .compatible = "maxim,max9867", },
540 	{ }
541 };
542 MODULE_DEVICE_TABLE(of, max9867_of_match);
543 
544 static struct i2c_driver max9867_i2c_driver = {
545 	.driver = {
546 		.name = "max9867",
547 		.of_match_table = of_match_ptr(max9867_of_match),
548 	},
549 	.probe  = max9867_i2c_probe,
550 	.id_table = max9867_i2c_id,
551 };
552 
553 module_i2c_driver(max9867_i2c_driver);
554 
555 MODULE_AUTHOR("anish kumar <yesanishhere@gmail.com>");
556 MODULE_DESCRIPTION("ALSA SoC MAX9867 driver");
557 MODULE_LICENSE("GPL");
558