midas_wm1811.c

  1// SPDX-License-Identifier: GPL-2.0+
  2//
  3// Midas audio support
  4//
  5// Copyright (C) 2018 Simon Shields <simon@lineageos.org>
  6// Copyright (C) 2020 Samsung Electronics Co., Ltd.
  7
  8#include <linux/clk.h>
  9#include <linux/gpio/consumer.h>
 10#include <linux/iio/consumer.h>
 11#include <linux/mfd/wm8994/registers.h>
 12#include <linux/input-event-codes.h>
 13#include <linux/module.h>
 14#include <linux/of.h>
 15#include <sound/jack.h>
 16#include <sound/soc.h>
 17#include <sound/soc-dapm.h>
 18
 19#include "i2s.h"
 20#include "../codecs/wm8994.h"
 21
 22/*
 23 * The MCLK1 clock source is XCLKOUT with its mux set to the external fixed rate
 24 * oscillator (XXTI).
 25 */
 26#define MCLK1_RATE 24000000U
 27#define MCLK2_RATE 32768U
 28#define DEFAULT_FLL1_RATE 11289600U
 29
 30struct midas_priv {
 31	struct gpio_desc *gpio_fm_sel;
 32	struct gpio_desc *gpio_lineout_sel;
 33	struct gpio_desc *gpio_headset_detect;
 34	struct gpio_desc *gpio_headset_key;
 35	struct iio_channel *adc_headset_detect;
 36	unsigned int fll1_rate;
 37
 38	struct snd_soc_jack headset_jack;
 39};
 40
 41static struct snd_soc_jack_pin headset_jack_pins[] = {
 42	{
 43		.pin = "Headphone",
 44		.mask = SND_JACK_HEADPHONE,
 45	},
 46	{
 47		.pin = "Headset Mic",
 48		.mask = SND_JACK_MICROPHONE,
 49	},
 50};
 51
 52/*
 53 * min_mv/max_mv values in this struct are set up based on DT values.
 54 */
 55static struct snd_soc_jack_zone headset_jack_zones[] = {
 56	{ .jack_type = SND_JACK_HEADPHONE, },
 57	{ .jack_type = SND_JACK_HEADSET, },
 58	{ .jack_type = SND_JACK_HEADPHONE, },
 59};
 60
 61/*
 62 * This is used for manual detection in headset_key_check, we reuse the
 63 * structure since it's convenient.
 64 *
 65 * min_mv/max_mv values in this struct are set up based on DT values.
 66 */
 67static struct snd_soc_jack_zone headset_key_zones[] = {
 68	{ .jack_type = SND_JACK_BTN_0, },  /* Media */
 69	{ .jack_type = SND_JACK_BTN_1, },  /* Volume Up */
 70	{ .jack_type = SND_JACK_BTN_2, },  /* Volume Down */
 71};
 72
 73static int headset_jack_check(void *data)
 74{
 75	struct snd_soc_component *codec = data;
 76	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(codec);
 77	struct midas_priv *priv = snd_soc_card_get_drvdata(codec->card);
 78	int adc, ret;
 79	int jack_type = 0;
 80
 81	if (!gpiod_get_value_cansleep(priv->gpio_headset_detect))
 82		return 0;
 83
 84	/* Enable headset mic bias regulator so that the ADC reading works */
 85	ret = snd_soc_dapm_force_enable_pin(dapm, "headset-mic-bias");
 86	if (ret < 0) {
 87		pr_err("%s: Failed to enable headset mic bias regulator (%d), assuming headphones\n",
 88		       __func__, ret);
 89		return SND_JACK_HEADPHONE;
 90	}
 91	snd_soc_dapm_sync(dapm);
 92
 93	/* Sleep for a small amount of time to get the value to stabilize */
 94	msleep(20);
 95
 96	ret = iio_read_channel_processed(priv->adc_headset_detect, &adc);
 97	if (ret) {
 98		pr_err("%s: Failed to read ADC (%d), assuming headphones\n",
 99		       __func__, ret);
100		jack_type = SND_JACK_HEADPHONE;
101		goto out;
102	}
103	pr_debug("%s: ADC value is %d\n", __func__, adc);
104
105	jack_type = snd_soc_jack_get_type(&priv->headset_jack, adc);
106
107out:
108	ret = snd_soc_dapm_disable_pin(dapm, "headset-mic-bias");
109	if (ret < 0)
110		pr_err("%s: Failed to disable headset mic bias regulator (%d)\n",
111		       __func__, ret);
112	snd_soc_dapm_sync(dapm);
113
114	return jack_type;
115}
116
117static int headset_key_check(void *data)
118{
119	struct snd_soc_component *codec = data;
120	struct midas_priv *priv = snd_soc_card_get_drvdata(codec->card);
121	int adc, i, ret;
122
123	if (!gpiod_get_value_cansleep(priv->gpio_headset_key))
124		return 0;
125
126	/* Filter out keypresses when 4 pole jack not detected */
127	if (!(priv->headset_jack.status & SND_JACK_MICROPHONE))
128		return 0;
129
130	ret = iio_read_channel_processed(priv->adc_headset_detect, &adc);
131	if (ret) {
132		pr_err("%s: Failed to read ADC (%d), can't detect key type\n",
133		       __func__, ret);
134		return 0;
135	}
136	pr_debug("%s: ADC value is %d\n", __func__, adc);
137
138	for (i = 0; i < ARRAY_SIZE(headset_key_zones); i++) {
139		if (adc >= headset_key_zones[i].min_mv &&
140		    adc <= headset_key_zones[i].max_mv) {
141			return headset_key_zones[i].jack_type;
142		}
143	}
144
145	return 0;
146}
147
148static struct snd_soc_jack_gpio headset_gpio[] = {
149	{
150		.name = "Headset Jack",
151		.report = SND_JACK_HEADSET,
152		.debounce_time = 150,
153		.jack_status_check = headset_jack_check,
154	},
155	{
156		.name = "Headset Key",
157		.report = SND_JACK_BTN_0 | SND_JACK_BTN_1 | SND_JACK_BTN_2,
158		.debounce_time = 30,
159		.jack_status_check = headset_key_check,
160	},
161};
162
163static int midas_start_fll1(struct snd_soc_pcm_runtime *rtd, unsigned int rate)
164{
165	struct snd_soc_card *card = rtd->card;
166	struct midas_priv *priv = snd_soc_card_get_drvdata(card);
167	struct snd_soc_dai *aif1_dai = snd_soc_rtd_to_codec(rtd, 0);
168	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
169	int ret;
170
171	if (!rate)
172		rate = priv->fll1_rate;
173	/*
174	 * If no new rate is requested, set FLL1 to a sane default for jack
175	 * detection.
176	 */
177	if (!rate)
178		rate = DEFAULT_FLL1_RATE;
179
180	if (rate != priv->fll1_rate && priv->fll1_rate) {
181		/* while reconfiguring, switch to MCLK2 for SYSCLK */
182		ret = snd_soc_dai_set_sysclk(aif1_dai, WM8994_SYSCLK_MCLK2,
183					     MCLK2_RATE, SND_SOC_CLOCK_IN);
184		if (ret < 0) {
185			dev_err(card->dev, "Unable to switch to MCLK2: %d\n", ret);
186			return ret;
187		}
188	}
189
190	ret = snd_soc_dai_set_pll(aif1_dai, WM8994_FLL1, WM8994_FLL_SRC_MCLK1,
191				  MCLK1_RATE, rate);
192	if (ret < 0) {
193		dev_err(card->dev, "Failed to set FLL1 rate: %d\n", ret);
194		return ret;
195	}
196	priv->fll1_rate = rate;
197
198	ret = snd_soc_dai_set_sysclk(aif1_dai, WM8994_SYSCLK_FLL1,
199				     priv->fll1_rate, SND_SOC_CLOCK_IN);
200	if (ret < 0) {
201		dev_err(card->dev, "Failed to set SYSCLK source: %d\n", ret);
202		return ret;
203	}
204
205	ret = snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_OPCLK, 0,
206				     SAMSUNG_I2S_OPCLK_PCLK);
207	if (ret < 0) {
208		dev_err(card->dev, "Failed to set OPCLK source: %d\n", ret);
209		return ret;
210	}
211
212	return 0;
213}
214
215static int midas_stop_fll1(struct snd_soc_pcm_runtime *rtd)
216{
217	struct snd_soc_card *card = rtd->card;
218	struct midas_priv *priv = snd_soc_card_get_drvdata(card);
219	struct snd_soc_dai *aif1_dai = snd_soc_rtd_to_codec(rtd, 0);
220	int ret;
221
222	ret = snd_soc_dai_set_sysclk(aif1_dai, WM8994_SYSCLK_MCLK2,
223				     MCLK2_RATE, SND_SOC_CLOCK_IN);
224	if (ret < 0) {
225		dev_err(card->dev, "Unable to switch to MCLK2: %d\n", ret);
226		return ret;
227	}
228
229	ret = snd_soc_dai_set_pll(aif1_dai, WM8994_FLL1, 0, 0, 0);
230	if (ret < 0) {
231		dev_err(card->dev, "Unable to stop FLL1: %d\n", ret);
232		return ret;
233	}
234
235	priv->fll1_rate = 0;
236
237	return 0;
238}
239
240static int midas_aif1_hw_params(struct snd_pcm_substream *substream,
241				struct snd_pcm_hw_params *params)
242{
243	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
244	unsigned int pll_out;
245
246	/* AIF1CLK should be at least 3MHz for "optimal performance" */
247	if (params_rate(params) == 8000 || params_rate(params) == 11025)
248		pll_out = params_rate(params) * 512;
249	else
250		pll_out = params_rate(params) * 256;
251
252	return midas_start_fll1(rtd, pll_out);
253}
254
255static const struct snd_soc_ops midas_aif1_ops = {
256	.hw_params = midas_aif1_hw_params,
257};
258
259/*
260 * We only have a single external speaker, so mix stereo data
261 * to a single mono stream.
262 */
263static int midas_ext_spkmode(struct snd_soc_dapm_widget *w,
264			     struct snd_kcontrol *kcontrol, int event)
265{
266	struct snd_soc_component *codec = snd_soc_dapm_to_component(w->dapm);
267	int ret = 0;
268
269	switch (event) {
270	case SND_SOC_DAPM_PRE_PMU:
271		ret = snd_soc_component_update_bits(codec, WM8994_SPKOUT_MIXERS,
272				  WM8994_SPKMIXR_TO_SPKOUTL_MASK,
273				  WM8994_SPKMIXR_TO_SPKOUTL);
274		break;
275	case SND_SOC_DAPM_POST_PMD:
276		ret = snd_soc_component_update_bits(codec, WM8994_SPKOUT_MIXERS,
277				  WM8994_SPKMIXR_TO_SPKOUTL_MASK,
278				  0);
279		break;
280	}
281
282	return ret;
283}
284
285static int midas_fm_set(struct snd_soc_dapm_widget *w,
286			struct snd_kcontrol *kcontrol, int event)
287{
288	struct snd_soc_card *card = snd_soc_dapm_to_card(w->dapm);
289	struct midas_priv *priv = snd_soc_card_get_drvdata(card);
290
291	if (!priv->gpio_fm_sel)
292		return 0;
293
294	switch (event) {
295	case SND_SOC_DAPM_PRE_PMU:
296		gpiod_set_value_cansleep(priv->gpio_fm_sel, 1);
297		break;
298	case SND_SOC_DAPM_POST_PMD:
299		gpiod_set_value_cansleep(priv->gpio_fm_sel, 0);
300		break;
301	}
302
303	return 0;
304}
305
306static int midas_line_set(struct snd_soc_dapm_widget *w,
307			  struct snd_kcontrol *kcontrol, int event)
308{
309	struct snd_soc_card *card = snd_soc_dapm_to_card(w->dapm);
310	struct midas_priv *priv = snd_soc_card_get_drvdata(card);
311
312	if (!priv->gpio_lineout_sel)
313		return 0;
314
315	switch (event) {
316	case SND_SOC_DAPM_PRE_PMU:
317		gpiod_set_value_cansleep(priv->gpio_lineout_sel, 1);
318		break;
319	case SND_SOC_DAPM_POST_PMD:
320		gpiod_set_value_cansleep(priv->gpio_lineout_sel, 0);
321		break;
322	}
323
324	return 0;
325}
326
327static const struct snd_kcontrol_new midas_controls[] = {
328	SOC_DAPM_PIN_SWITCH("HP"),
329
330	SOC_DAPM_PIN_SWITCH("SPK"),
331	SOC_DAPM_PIN_SWITCH("RCV"),
332
333	SOC_DAPM_PIN_SWITCH("LINE"),
334	SOC_DAPM_PIN_SWITCH("HDMI"),
335
336	SOC_DAPM_PIN_SWITCH("Main Mic"),
337	SOC_DAPM_PIN_SWITCH("Sub Mic"),
338	SOC_DAPM_PIN_SWITCH("Headset Mic"),
339
340	SOC_DAPM_PIN_SWITCH("FM In"),
341};
342
343static const struct snd_soc_dapm_widget midas_dapm_widgets[] = {
344	SND_SOC_DAPM_HP("HP", NULL),
345
346	SND_SOC_DAPM_SPK("SPK", midas_ext_spkmode),
347	SND_SOC_DAPM_SPK("RCV", NULL),
348
349	/* FIXME: toggle MAX77693 on i9300/i9305 */
350	SND_SOC_DAPM_LINE("LINE", midas_line_set),
351	SND_SOC_DAPM_LINE("HDMI", NULL),
352	SND_SOC_DAPM_LINE("FM In", midas_fm_set),
353
354	SND_SOC_DAPM_HP("Headphone", NULL),
355	SND_SOC_DAPM_MIC("Headset Mic", NULL),
356	SND_SOC_DAPM_REGULATOR_SUPPLY("headset-mic-bias", 0, 0),
357	SND_SOC_DAPM_MIC("Main Mic", NULL),
358	SND_SOC_DAPM_REGULATOR_SUPPLY("mic-bias", 0, 0),
359	SND_SOC_DAPM_MIC("Sub Mic", NULL),
360	SND_SOC_DAPM_REGULATOR_SUPPLY("submic-bias", 0, 0),
361};
362
363/* Default routing; supplemented by audio-routing DT property */
364static const struct snd_soc_dapm_route midas_dapm_routes[] = {
365	/* Bind microphones with their respective regulator supplies */
366	{"Main Mic", NULL, "mic-bias"},
367	{"Sub Mic", NULL, "submic-bias"},
368	{"Headset Mic", NULL, "headset-mic-bias"},
369};
370
371static int midas_set_bias_level(struct snd_soc_card *card,
372				struct snd_soc_dapm_context *dapm,
373				enum snd_soc_bias_level level)
374{
375	struct snd_soc_pcm_runtime *rtd = snd_soc_get_pcm_runtime(card,
376						  &card->dai_link[0]);
377	struct snd_soc_dai *aif1_dai = snd_soc_rtd_to_codec(rtd, 0);
378
379	if (snd_soc_dapm_to_dev(dapm) != aif1_dai->dev)
380		return 0;
381
382	switch (level) {
383	case SND_SOC_BIAS_STANDBY:
384		return midas_stop_fll1(rtd);
385	case SND_SOC_BIAS_PREPARE:
386		return midas_start_fll1(rtd, 0);
387	default:
388		break;
389	}
390
391	return 0;
392}
393
394static int midas_late_probe(struct snd_soc_card *card)
395{
396	struct snd_soc_pcm_runtime *rtd = snd_soc_get_pcm_runtime(card,
397							&card->dai_link[0]);
398	struct snd_soc_dai *aif1_dai = snd_soc_rtd_to_codec(rtd, 0);
399	struct midas_priv *priv = snd_soc_card_get_drvdata(card);
400	int ret;
401
402	/* Use MCLK2 as SYSCLK for boot */
403	ret = snd_soc_dai_set_sysclk(aif1_dai, WM8994_SYSCLK_MCLK2, MCLK2_RATE,
404				     SND_SOC_CLOCK_IN);
405	if (ret < 0) {
406		dev_err(aif1_dai->dev, "Failed to switch to MCLK2: %d\n", ret);
407		return ret;
408	}
409
410	if (!priv->gpio_headset_detect) {
411		ret = snd_soc_card_jack_new_pins(card, "Headset",
412				 SND_JACK_HEADSET | SND_JACK_MECHANICAL |
413				 SND_JACK_BTN_0 | SND_JACK_BTN_1 |
414				 SND_JACK_BTN_2 | SND_JACK_BTN_3 |
415				 SND_JACK_BTN_4 | SND_JACK_BTN_5,
416				 &priv->headset_jack,
417				 headset_jack_pins,
418				 ARRAY_SIZE(headset_jack_pins));
419		if (ret)
420			return ret;
421
422		wm8958_mic_detect(aif1_dai->component, &priv->headset_jack,
423				  NULL, NULL, NULL, NULL);
424	} else {
425		/* Some devices (n8000, t310) use a GPIO to detect the jack. */
426		ret = snd_soc_card_jack_new_pins(card, "Headset",
427				SND_JACK_HEADSET | SND_JACK_BTN_0 |
428				SND_JACK_BTN_1 | SND_JACK_BTN_2,
429				&priv->headset_jack,
430				headset_jack_pins,
431				ARRAY_SIZE(headset_jack_pins));
432		if (ret) {
433			dev_err(card->dev,
434				"Failed to set up headset pins: %d\n", ret);
435			return ret;
436		}
437
438		ret = snd_soc_jack_add_zones(&priv->headset_jack,
439				ARRAY_SIZE(headset_jack_zones),
440				headset_jack_zones);
441		if (ret) {
442			dev_err(card->dev,
443				"Failed to set up headset zones: %d\n", ret);
444			return ret;
445		}
446
447		headset_gpio[0].data = aif1_dai->component;
448		headset_gpio[0].desc = priv->gpio_headset_detect;
449
450		headset_gpio[1].data = aif1_dai->component;
451		headset_gpio[1].desc = priv->gpio_headset_key;
452
453		snd_jack_set_key(priv->headset_jack.jack,
454				 SND_JACK_BTN_0, KEY_MEDIA);
455		snd_jack_set_key(priv->headset_jack.jack,
456				 SND_JACK_BTN_1, KEY_VOLUMEUP);
457		snd_jack_set_key(priv->headset_jack.jack,
458				 SND_JACK_BTN_2, KEY_VOLUMEDOWN);
459
460		ret = snd_soc_jack_add_gpios(&priv->headset_jack,
461				ARRAY_SIZE(headset_gpio),
462				headset_gpio);
463		if (ret)
464			dev_err(card->dev,
465				"Failed to set up headset jack GPIOs: %d\n",
466				ret);
467
468		return ret;
469	}
470
471	return 0;
472}
473
474static struct snd_soc_dai_driver midas_ext_dai[] = {
475	{
476		.name = "Voice call",
477		.playback = {
478			.channels_min = 1,
479			.channels_max = 2,
480			.rate_min = 8000,
481			.rate_max = 16000,
482			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000),
483			.formats = SNDRV_PCM_FMTBIT_S16_LE,
484		},
485		.capture = {
486			.channels_min = 1,
487			.channels_max = 2,
488			.rate_min = 8000,
489			.rate_max = 16000,
490			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000),
491			.formats = SNDRV_PCM_FMTBIT_S16_LE,
492		},
493	},
494	{
495		.name = "Bluetooth",
496		.playback = {
497			.channels_min = 1,
498			.channels_max = 2,
499			.rate_min = 8000,
500			.rate_max = 16000,
501			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000),
502			.formats = SNDRV_PCM_FMTBIT_S16_LE,
503		},
504		.capture = {
505			.channels_min = 1,
506			.channels_max = 2,
507			.rate_min = 8000,
508			.rate_max = 16000,
509			.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000),
510			.formats = SNDRV_PCM_FMTBIT_S16_LE,
511		},
512	},
513};
514
515static const struct snd_soc_component_driver midas_component = {
516	.name	= "midas-audio",
517};
518
519SND_SOC_DAILINK_DEFS(wm1811_hifi,
520	DAILINK_COMP_ARRAY(COMP_EMPTY()),
521	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8994-aif1")),
522	DAILINK_COMP_ARRAY(COMP_EMPTY()));
523
524SND_SOC_DAILINK_DEFS(wm1811_voice,
525	DAILINK_COMP_ARRAY(COMP_EMPTY()),
526	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8994-aif2")),
527	DAILINK_COMP_ARRAY(COMP_EMPTY()));
528
529SND_SOC_DAILINK_DEFS(wm1811_bt,
530	DAILINK_COMP_ARRAY(COMP_EMPTY()),
531	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "wm8994-aif3")),
532	DAILINK_COMP_ARRAY(COMP_EMPTY()));
533
534static struct snd_soc_dai_link midas_dai[] = {
535	{
536		.name = "WM8994 AIF1",
537		.stream_name = "HiFi Primary",
538		.ops = &midas_aif1_ops,
539		.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
540			SND_SOC_DAIFMT_CBP_CFP,
541		SND_SOC_DAILINK_REG(wm1811_hifi),
542	}, {
543		.name = "WM1811 Voice",
544		.stream_name = "Voice call",
545		.ignore_suspend = 1,
546		SND_SOC_DAILINK_REG(wm1811_voice),
547	}, {
548		.name = "WM1811 BT",
549		.stream_name = "Bluetooth",
550		.ignore_suspend = 1,
551		SND_SOC_DAILINK_REG(wm1811_bt),
552	},
553};
554
555static struct snd_soc_card midas_card = {
556	.name = "Midas WM1811",
557	.owner = THIS_MODULE,
558
559	.dai_link = midas_dai,
560	.num_links = ARRAY_SIZE(midas_dai),
561	.controls = midas_controls,
562	.num_controls = ARRAY_SIZE(midas_controls),
563	.dapm_widgets = midas_dapm_widgets,
564	.num_dapm_widgets = ARRAY_SIZE(midas_dapm_widgets),
565	.dapm_routes = midas_dapm_routes,
566	.num_dapm_routes = ARRAY_SIZE(midas_dapm_routes),
567
568	.set_bias_level = midas_set_bias_level,
569	.late_probe = midas_late_probe,
570};
571
572static int midas_probe(struct platform_device *pdev)
573{
574	struct device_node *cpu_dai_node = NULL, *codec_dai_node = NULL;
575	struct device_node *cpu = NULL, *codec = NULL;
576	struct snd_soc_card *card = &midas_card;
577	struct device *dev = &pdev->dev;
578	static struct snd_soc_dai_link *dai_link;
579	enum iio_chan_type channel_type;
580	u32 fourpole_threshold[2];
581	u32 button_threshold[3];
582	struct midas_priv *priv;
583	int ret, i;
584
585	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
586	if (!priv)
587		return -ENOMEM;
588
589	snd_soc_card_set_drvdata(card, priv);
590	card->dev = dev;
591
592	priv->gpio_fm_sel = devm_gpiod_get_optional(dev, "fm-sel", GPIOD_OUT_HIGH);
593	if (IS_ERR(priv->gpio_fm_sel))
594		return dev_err_probe(dev, PTR_ERR(priv->gpio_fm_sel),
595				     "Failed to get FM selection GPIO\n");
596
597	priv->gpio_lineout_sel = devm_gpiod_get_optional(dev, "lineout-sel",
598						    GPIOD_OUT_HIGH);
599	if (IS_ERR(priv->gpio_lineout_sel))
600		return dev_err_probe(dev, PTR_ERR(priv->gpio_lineout_sel),
601				     "Failed to get line out selection GPIO\n");
602
603	priv->gpio_headset_detect = devm_gpiod_get_optional(dev,
604				"headset-detect", GPIOD_IN);
605	if (IS_ERR(priv->gpio_headset_detect))
606		return dev_err_probe(dev, PTR_ERR(priv->gpio_headset_detect),
607				     "Failed to get headset jack detect GPIO\n");
608
609	if (priv->gpio_headset_detect) {
610		priv->adc_headset_detect = devm_iio_channel_get(dev,
611							"headset-detect");
612		if (IS_ERR(priv->adc_headset_detect))
613			return dev_err_probe(dev,
614					     PTR_ERR(priv->adc_headset_detect),
615					     "Failed to get ADC channel\n");
616
617		ret = iio_get_channel_type(priv->adc_headset_detect,
618					   &channel_type);
619		if (ret) {
620			dev_err(dev, "Failed to get ADC channel type\n");
621			return ret;
622		}
623
624		if (channel_type != IIO_VOLTAGE) {
625			dev_err(dev, "ADC channel is not voltage\n");
626			return -EINVAL;
627		}
628
629		priv->gpio_headset_key = devm_gpiod_get(dev, "headset-key",
630							GPIOD_IN);
631		if (IS_ERR(priv->gpio_headset_key))
632			return dev_err_probe(dev,
633					     PTR_ERR(priv->gpio_headset_key),
634					     "Failed to get headset key GPIO\n");
635
636		ret = of_property_read_u32_array(dev->of_node,
637				"samsung,headset-4pole-threshold-microvolt",
638				fourpole_threshold,
639				ARRAY_SIZE(fourpole_threshold));
640		if (ret) {
641			dev_err(dev, "Failed to get 4-pole jack detection threshold\n");
642			return ret;
643		}
644
645		if (fourpole_threshold[0] > fourpole_threshold[1]) {
646			dev_err(dev, "Invalid 4-pole jack detection threshold value\n");
647			return -EINVAL;
648		}
649
650		headset_jack_zones[0].max_mv = (fourpole_threshold[0]);
651		headset_jack_zones[1].min_mv = (fourpole_threshold[0] + 1);
652
653		headset_jack_zones[1].max_mv = (fourpole_threshold[1]);
654		headset_jack_zones[2].min_mv = (fourpole_threshold[1] + 1);
655
656		ret = of_property_read_u32_array(dev->of_node,
657				"samsung,headset-button-threshold-microvolt",
658				button_threshold,
659				ARRAY_SIZE(button_threshold));
660		if (ret) {
661			dev_err(dev, "Failed to get headset button detection threshold\n");
662			return ret;
663		}
664
665		if (button_threshold[0] > button_threshold[1] ||
666		    button_threshold[1] > button_threshold[2]) {
667			dev_err(dev, "Invalid headset button detection threshold value\n");
668			return -EINVAL;
669		}
670
671		for (i = 0; i < 3; i++) {
672			if (i != 0 && button_threshold[i] <= 0) {
673				dev_err(dev, "Invalid headset button detection threshold value\n");
674				return -EINVAL;
675			}
676
677			headset_key_zones[i].min_mv = button_threshold[i];
678
679			if (i == 2)
680				headset_key_zones[i].max_mv = UINT_MAX;
681			else
682				headset_key_zones[i].max_mv = \
683						(button_threshold[i+1] - 1);
684		}
685	}
686
687	ret = snd_soc_of_parse_card_name(card, "model");
688	if (ret < 0) {
689		dev_err(dev, "Card name is not specified\n");
690		return ret;
691	}
692
693	ret = snd_soc_of_parse_audio_routing(card, "audio-routing");
694	if (ret < 0) {
695		/* Backwards compatible way */
696		ret = snd_soc_of_parse_audio_routing(card, "samsung,audio-routing");
697		if (ret < 0) {
698			dev_err(dev, "Audio routing invalid/unspecified\n");
699			return ret;
700		}
701	}
702
703	cpu = of_get_child_by_name(dev->of_node, "cpu");
704	if (!cpu)
705		return -EINVAL;
706
707	codec = of_get_child_by_name(dev->of_node, "codec");
708	if (!codec) {
709		of_node_put(cpu);
710		return -EINVAL;
711	}
712
713	cpu_dai_node = of_parse_phandle(cpu, "sound-dai", 0);
714	of_node_put(cpu);
715	if (!cpu_dai_node) {
716		dev_err(dev, "parsing cpu/sound-dai failed\n");
717		of_node_put(codec);
718		return -EINVAL;
719	}
720
721	codec_dai_node = of_parse_phandle(codec, "sound-dai", 0);
722	of_node_put(codec);
723	if (!codec_dai_node) {
724		dev_err(dev, "audio-codec property invalid/missing\n");
725		ret = -EINVAL;
726		goto put_cpu_dai_node;
727	}
728
729	for_each_card_prelinks(card, i, dai_link) {
730		dai_link->codecs->of_node = codec_dai_node;
731		dai_link->cpus->of_node = cpu_dai_node;
732		dai_link->platforms->of_node = cpu_dai_node;
733	}
734
735	ret = devm_snd_soc_register_component(dev, &midas_component,
736			midas_ext_dai, ARRAY_SIZE(midas_ext_dai));
737	if (ret < 0) {
738		dev_err(dev, "Failed to register component: %d\n", ret);
739		goto put_codec_dai_node;
740	}
741
742	ret = devm_snd_soc_register_card(dev, card);
743	if (ret < 0) {
744		dev_err(dev, "Failed to register card: %d\n", ret);
745		goto put_codec_dai_node;
746	}
747
748	return 0;
749
750put_codec_dai_node:
751	of_node_put(codec_dai_node);
752put_cpu_dai_node:
753	of_node_put(cpu_dai_node);
754	return ret;
755}
756
757static const struct of_device_id midas_of_match[] = {
758	{ .compatible = "samsung,midas-audio" },
759	{ },
760};
761MODULE_DEVICE_TABLE(of, midas_of_match);
762
763static struct platform_driver midas_driver = {
764	.driver = {
765		.name = "midas-audio",
766		.of_match_table = midas_of_match,
767		.pm = &snd_soc_pm_ops,
768	},
769	.probe = midas_probe,
770};
771module_platform_driver(midas_driver);
772
773MODULE_AUTHOR("Simon Shields <simon@lineageos.org>");
774MODULE_DESCRIPTION("ASoC support for Midas");
775MODULE_LICENSE("GPL v2");