1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  cht_bsw_rt5672.c - ASoc Machine driver for Intel Cherryview-based platforms
4  *                     Cherrytrail and Braswell, with RT5672 codec.
5  *
6  *  Copyright (C) 2014 Intel Corp
7  *  Author: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
8  *          Mengdong Lin <mengdong.lin@intel.com>
9  */
10 
11 #include <linux/gpio/consumer.h>
12 #include <linux/input.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/slab.h>
16 #include <linux/clk.h>
17 #include <sound/pcm.h>
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20 #include <sound/jack.h>
21 #include <sound/soc-acpi.h>
22 #include "../../codecs/rt5670.h"
23 #include "../atom/sst-atom-controls.h"
24 
25 
26 /* The platform clock #3 outputs 19.2Mhz clock to codec as I2S MCLK */
27 #define CHT_PLAT_CLK_3_HZ	19200000
28 #define CHT_CODEC_DAI	"rt5670-aif1"
29 
30 struct cht_mc_private {
31 	struct snd_soc_jack headset;
32 	char codec_name[SND_ACPI_I2C_ID_LEN];
33 	struct clk *mclk;
34 };
35 
36 /* Headset jack detection DAPM pins */
37 static struct snd_soc_jack_pin cht_bsw_headset_pins[] = {
38 	{
39 		.pin = "Headset Mic",
40 		.mask = SND_JACK_MICROPHONE,
41 	},
42 	{
43 		.pin = "Headphone",
44 		.mask = SND_JACK_HEADPHONE,
45 	},
46 };
47 
48 static int platform_clock_control(struct snd_soc_dapm_widget *w,
49 		struct snd_kcontrol *k, int  event)
50 {
51 	struct snd_soc_dapm_context *dapm = w->dapm;
52 	struct snd_soc_card *card = dapm->card;
53 	struct snd_soc_dai *codec_dai;
54 	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(card);
55 	int ret;
56 
57 	codec_dai = snd_soc_card_get_codec_dai(card, CHT_CODEC_DAI);
58 	if (!codec_dai) {
59 		dev_err(card->dev, "Codec dai not found; Unable to set platform clock\n");
60 		return -EIO;
61 	}
62 
63 	if (SND_SOC_DAPM_EVENT_ON(event)) {
64 		if (ctx->mclk) {
65 			ret = clk_prepare_enable(ctx->mclk);
66 			if (ret < 0) {
67 				dev_err(card->dev,
68 					"could not configure MCLK state");
69 				return ret;
70 			}
71 		}
72 
73 		/* set codec PLL source to the 19.2MHz platform clock (MCLK) */
74 		ret = snd_soc_dai_set_pll(codec_dai, 0, RT5670_PLL1_S_MCLK,
75 				CHT_PLAT_CLK_3_HZ, 48000 * 512);
76 		if (ret < 0) {
77 			dev_err(card->dev, "can't set codec pll: %d\n", ret);
78 			return ret;
79 		}
80 
81 		/* set codec sysclk source to PLL */
82 		ret = snd_soc_dai_set_sysclk(codec_dai, RT5670_SCLK_S_PLL1,
83 			48000 * 512, SND_SOC_CLOCK_IN);
84 		if (ret < 0) {
85 			dev_err(card->dev, "can't set codec sysclk: %d\n", ret);
86 			return ret;
87 		}
88 	} else {
89 		/* Set codec sysclk source to its internal clock because codec
90 		 * PLL will be off when idle and MCLK will also be off by ACPI
91 		 * when codec is runtime suspended. Codec needs clock for jack
92 		 * detection and button press.
93 		 */
94 		snd_soc_dai_set_sysclk(codec_dai, RT5670_SCLK_S_RCCLK,
95 				       48000 * 512, SND_SOC_CLOCK_IN);
96 
97 		if (ctx->mclk)
98 			clk_disable_unprepare(ctx->mclk);
99 	}
100 	return 0;
101 }
102 
103 static const struct snd_soc_dapm_widget cht_dapm_widgets[] = {
104 	SND_SOC_DAPM_HP("Headphone", NULL),
105 	SND_SOC_DAPM_MIC("Headset Mic", NULL),
106 	SND_SOC_DAPM_MIC("Int Mic", NULL),
107 	SND_SOC_DAPM_SPK("Ext Spk", NULL),
108 	SND_SOC_DAPM_SUPPLY("Platform Clock", SND_SOC_NOPM, 0, 0,
109 			platform_clock_control, SND_SOC_DAPM_PRE_PMU |
110 			SND_SOC_DAPM_POST_PMD),
111 };
112 
113 static const struct snd_soc_dapm_route cht_audio_map[] = {
114 	{"IN1P", NULL, "Headset Mic"},
115 	{"IN1N", NULL, "Headset Mic"},
116 	{"DMIC L1", NULL, "Int Mic"},
117 	{"DMIC R1", NULL, "Int Mic"},
118 	{"Headphone", NULL, "HPOL"},
119 	{"Headphone", NULL, "HPOR"},
120 	{"Ext Spk", NULL, "SPOLP"},
121 	{"Ext Spk", NULL, "SPOLN"},
122 	{"Ext Spk", NULL, "SPORP"},
123 	{"Ext Spk", NULL, "SPORN"},
124 	{"AIF1 Playback", NULL, "ssp2 Tx"},
125 	{"ssp2 Tx", NULL, "codec_out0"},
126 	{"ssp2 Tx", NULL, "codec_out1"},
127 	{"codec_in0", NULL, "ssp2 Rx"},
128 	{"codec_in1", NULL, "ssp2 Rx"},
129 	{"ssp2 Rx", NULL, "AIF1 Capture"},
130 	{"Headphone", NULL, "Platform Clock"},
131 	{"Headset Mic", NULL, "Platform Clock"},
132 	{"Int Mic", NULL, "Platform Clock"},
133 	{"Ext Spk", NULL, "Platform Clock"},
134 };
135 
136 static const struct snd_kcontrol_new cht_mc_controls[] = {
137 	SOC_DAPM_PIN_SWITCH("Headphone"),
138 	SOC_DAPM_PIN_SWITCH("Headset Mic"),
139 	SOC_DAPM_PIN_SWITCH("Int Mic"),
140 	SOC_DAPM_PIN_SWITCH("Ext Spk"),
141 };
142 
143 static int cht_aif1_hw_params(struct snd_pcm_substream *substream,
144 					struct snd_pcm_hw_params *params)
145 {
146 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
147 	struct snd_soc_dai *codec_dai = rtd->codec_dai;
148 	int ret;
149 
150 	/* set codec PLL source to the 19.2MHz platform clock (MCLK) */
151 	ret = snd_soc_dai_set_pll(codec_dai, 0, RT5670_PLL1_S_MCLK,
152 				  CHT_PLAT_CLK_3_HZ, params_rate(params) * 512);
153 	if (ret < 0) {
154 		dev_err(rtd->dev, "can't set codec pll: %d\n", ret);
155 		return ret;
156 	}
157 
158 	/* set codec sysclk source to PLL */
159 	ret = snd_soc_dai_set_sysclk(codec_dai, RT5670_SCLK_S_PLL1,
160 				     params_rate(params) * 512,
161 				     SND_SOC_CLOCK_IN);
162 	if (ret < 0) {
163 		dev_err(rtd->dev, "can't set codec sysclk: %d\n", ret);
164 		return ret;
165 	}
166 	return 0;
167 }
168 
169 static const struct acpi_gpio_params headset_gpios = { 0, 0, false };
170 
171 static const struct acpi_gpio_mapping cht_rt5672_gpios[] = {
172 	{ "headset-gpios", &headset_gpios, 1 },
173 	{},
174 };
175 
176 static int cht_codec_init(struct snd_soc_pcm_runtime *runtime)
177 {
178 	int ret;
179 	struct snd_soc_dai *codec_dai = runtime->codec_dai;
180 	struct snd_soc_component *component = codec_dai->component;
181 	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(runtime->card);
182 
183 	if (devm_acpi_dev_add_driver_gpios(component->dev, cht_rt5672_gpios))
184 		dev_warn(runtime->dev, "Unable to add GPIO mapping table\n");
185 
186 	/* Select codec ASRC clock source to track I2S1 clock, because codec
187 	 * is in slave mode and 100fs I2S format (BCLK = 100 * LRCLK) cannot
188 	 * be supported by RT5672. Otherwise, ASRC will be disabled and cause
189 	 * noise.
190 	 */
191 	rt5670_sel_asrc_clk_src(component,
192 				RT5670_DA_STEREO_FILTER
193 				| RT5670_DA_MONO_L_FILTER
194 				| RT5670_DA_MONO_R_FILTER
195 				| RT5670_AD_STEREO_FILTER
196 				| RT5670_AD_MONO_L_FILTER
197 				| RT5670_AD_MONO_R_FILTER,
198 				RT5670_CLK_SEL_I2S1_ASRC);
199 
200         ret = snd_soc_card_jack_new(runtime->card, "Headset",
201 				    SND_JACK_HEADSET | SND_JACK_BTN_0 |
202 				    SND_JACK_BTN_1 | SND_JACK_BTN_2,
203 				    &ctx->headset,
204 				    cht_bsw_headset_pins,
205 				    ARRAY_SIZE(cht_bsw_headset_pins));
206         if (ret)
207                 return ret;
208 
209 	snd_jack_set_key(ctx->headset.jack, SND_JACK_BTN_0, KEY_PLAYPAUSE);
210 	snd_jack_set_key(ctx->headset.jack, SND_JACK_BTN_1, KEY_VOLUMEUP);
211 	snd_jack_set_key(ctx->headset.jack, SND_JACK_BTN_2, KEY_VOLUMEDOWN);
212 
213 	rt5670_set_jack_detect(component, &ctx->headset);
214 	if (ctx->mclk) {
215 		/*
216 		 * The firmware might enable the clock at
217 		 * boot (this information may or may not
218 		 * be reflected in the enable clock register).
219 		 * To change the rate we must disable the clock
220 		 * first to cover these cases. Due to common
221 		 * clock framework restrictions that do not allow
222 		 * to disable a clock that has not been enabled,
223 		 * we need to enable the clock first.
224 		 */
225 		ret = clk_prepare_enable(ctx->mclk);
226 		if (!ret)
227 			clk_disable_unprepare(ctx->mclk);
228 
229 		ret = clk_set_rate(ctx->mclk, CHT_PLAT_CLK_3_HZ);
230 
231 		if (ret) {
232 			dev_err(runtime->dev, "unable to set MCLK rate\n");
233 			return ret;
234 		}
235 	}
236 	return 0;
237 }
238 
239 static int cht_codec_fixup(struct snd_soc_pcm_runtime *rtd,
240 			    struct snd_pcm_hw_params *params)
241 {
242 	struct snd_interval *rate = hw_param_interval(params,
243 			SNDRV_PCM_HW_PARAM_RATE);
244 	struct snd_interval *channels = hw_param_interval(params,
245 						SNDRV_PCM_HW_PARAM_CHANNELS);
246 	int ret;
247 
248 	/* The DSP will covert the FE rate to 48k, stereo, 24bits */
249 	rate->min = rate->max = 48000;
250 	channels->min = channels->max = 2;
251 
252 	/* set SSP2 to 24-bit */
253 	params_set_format(params, SNDRV_PCM_FORMAT_S24_LE);
254 
255 	/*
256 	 * Default mode for SSP configuration is TDM 4 slot
257 	 */
258 	ret = snd_soc_dai_set_fmt(rtd->codec_dai,
259 				  SND_SOC_DAIFMT_DSP_B |
260 				  SND_SOC_DAIFMT_IB_NF |
261 				  SND_SOC_DAIFMT_CBS_CFS);
262 	if (ret < 0) {
263 		dev_err(rtd->dev, "can't set format to TDM %d\n", ret);
264 		return ret;
265 	}
266 
267 	/* TDM 4 slots 24 bit, set Rx & Tx bitmask to 4 active slots */
268 	ret = snd_soc_dai_set_tdm_slot(rtd->codec_dai, 0xF, 0xF, 4, 24);
269 	if (ret < 0) {
270 		dev_err(rtd->dev, "can't set codec TDM slot %d\n", ret);
271 		return ret;
272 	}
273 
274 	return 0;
275 }
276 
277 static int cht_aif1_startup(struct snd_pcm_substream *substream)
278 {
279 	return snd_pcm_hw_constraint_single(substream->runtime,
280 			SNDRV_PCM_HW_PARAM_RATE, 48000);
281 }
282 
283 static const struct snd_soc_ops cht_aif1_ops = {
284 	.startup = cht_aif1_startup,
285 };
286 
287 static const struct snd_soc_ops cht_be_ssp2_ops = {
288 	.hw_params = cht_aif1_hw_params,
289 };
290 
291 SND_SOC_DAILINK_DEF(dummy,
292 	DAILINK_COMP_ARRAY(COMP_DUMMY()));
293 
294 SND_SOC_DAILINK_DEF(media,
295 	DAILINK_COMP_ARRAY(COMP_CPU("media-cpu-dai")));
296 
297 SND_SOC_DAILINK_DEF(deepbuffer,
298 	DAILINK_COMP_ARRAY(COMP_CPU("deepbuffer-cpu-dai")));
299 
300 SND_SOC_DAILINK_DEF(ssp2_port,
301 	DAILINK_COMP_ARRAY(COMP_CPU("ssp2-port")));
302 SND_SOC_DAILINK_DEF(ssp2_codec,
303 	DAILINK_COMP_ARRAY(COMP_CODEC("i2c-10EC5670:00",
304 				      "rt5670-aif1")));
305 
306 SND_SOC_DAILINK_DEF(platform,
307 	DAILINK_COMP_ARRAY(COMP_PLATFORM("sst-mfld-platform")));
308 
309 static struct snd_soc_dai_link cht_dailink[] = {
310 	/* Front End DAI links */
311 	[MERR_DPCM_AUDIO] = {
312 		.name = "Audio Port",
313 		.stream_name = "Audio",
314 		.nonatomic = true,
315 		.dynamic = 1,
316 		.dpcm_playback = 1,
317 		.dpcm_capture = 1,
318 		.ops = &cht_aif1_ops,
319 		SND_SOC_DAILINK_REG(media, dummy, platform),
320 	},
321 	[MERR_DPCM_DEEP_BUFFER] = {
322 		.name = "Deep-Buffer Audio Port",
323 		.stream_name = "Deep-Buffer Audio",
324 		.nonatomic = true,
325 		.dynamic = 1,
326 		.dpcm_playback = 1,
327 		.ops = &cht_aif1_ops,
328 		SND_SOC_DAILINK_REG(deepbuffer, dummy, platform),
329 	},
330 
331 	/* Back End DAI links */
332 	{
333 		/* SSP2 - Codec */
334 		.name = "SSP2-Codec",
335 		.id = 0,
336 		.no_pcm = 1,
337 		.nonatomic = true,
338 		.init = cht_codec_init,
339 		.be_hw_params_fixup = cht_codec_fixup,
340 		.dpcm_playback = 1,
341 		.dpcm_capture = 1,
342 		.ops = &cht_be_ssp2_ops,
343 		SND_SOC_DAILINK_REG(ssp2_port, ssp2_codec, platform),
344 	},
345 };
346 
347 static int cht_suspend_pre(struct snd_soc_card *card)
348 {
349 	struct snd_soc_component *component;
350 	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(card);
351 
352 	for_each_card_components(card, component) {
353 		if (!strncmp(component->name,
354 			     ctx->codec_name, sizeof(ctx->codec_name))) {
355 
356 			dev_dbg(component->dev, "disabling jack detect before going to suspend.\n");
357 			rt5670_jack_suspend(component);
358 			break;
359 		}
360 	}
361 	return 0;
362 }
363 
364 static int cht_resume_post(struct snd_soc_card *card)
365 {
366 	struct snd_soc_component *component;
367 	struct cht_mc_private *ctx = snd_soc_card_get_drvdata(card);
368 
369 	for_each_card_components(card, component) {
370 		if (!strncmp(component->name,
371 			     ctx->codec_name, sizeof(ctx->codec_name))) {
372 
373 			dev_dbg(component->dev, "enabling jack detect for resume.\n");
374 			rt5670_jack_resume(component);
375 			break;
376 		}
377 	}
378 
379 	return 0;
380 }
381 
382 /* SoC card */
383 static struct snd_soc_card snd_soc_card_cht = {
384 	.name = "cht-bsw-rt5672",
385 	.owner = THIS_MODULE,
386 	.dai_link = cht_dailink,
387 	.num_links = ARRAY_SIZE(cht_dailink),
388 	.dapm_widgets = cht_dapm_widgets,
389 	.num_dapm_widgets = ARRAY_SIZE(cht_dapm_widgets),
390 	.dapm_routes = cht_audio_map,
391 	.num_dapm_routes = ARRAY_SIZE(cht_audio_map),
392 	.controls = cht_mc_controls,
393 	.num_controls = ARRAY_SIZE(cht_mc_controls),
394 	.suspend_pre = cht_suspend_pre,
395 	.resume_post = cht_resume_post,
396 };
397 
398 #define RT5672_I2C_DEFAULT	"i2c-10EC5670:00"
399 
400 static int snd_cht_mc_probe(struct platform_device *pdev)
401 {
402 	int ret_val = 0;
403 	struct cht_mc_private *drv;
404 	struct snd_soc_acpi_mach *mach = pdev->dev.platform_data;
405 	const char *platform_name;
406 	struct acpi_device *adev;
407 	int i;
408 
409 	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
410 	if (!drv)
411 		return -ENOMEM;
412 
413 	strcpy(drv->codec_name, RT5672_I2C_DEFAULT);
414 
415 	/* fixup codec name based on HID */
416 	adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1);
417 	if (adev) {
418 		snprintf(drv->codec_name, sizeof(drv->codec_name),
419 			 "i2c-%s", acpi_dev_name(adev));
420 		put_device(&adev->dev);
421 		for (i = 0; i < ARRAY_SIZE(cht_dailink); i++) {
422 			if (!strcmp(cht_dailink[i].codecs->name,
423 				    RT5672_I2C_DEFAULT)) {
424 				cht_dailink[i].codecs->name = drv->codec_name;
425 				break;
426 			}
427 		}
428 	}
429 
430 	/* override plaform name, if required */
431 	snd_soc_card_cht.dev = &pdev->dev;
432 	platform_name = mach->mach_params.platform;
433 
434 	ret_val = snd_soc_fixup_dai_links_platform_name(&snd_soc_card_cht,
435 							platform_name);
436 	if (ret_val)
437 		return ret_val;
438 
439 	drv->mclk = devm_clk_get(&pdev->dev, "pmc_plt_clk_3");
440 	if (IS_ERR(drv->mclk)) {
441 		dev_err(&pdev->dev,
442 			"Failed to get MCLK from pmc_plt_clk_3: %ld\n",
443 			PTR_ERR(drv->mclk));
444 		return PTR_ERR(drv->mclk);
445 	}
446 	snd_soc_card_set_drvdata(&snd_soc_card_cht, drv);
447 
448 	/* register the soc card */
449 	ret_val = devm_snd_soc_register_card(&pdev->dev, &snd_soc_card_cht);
450 	if (ret_val) {
451 		dev_err(&pdev->dev,
452 			"snd_soc_register_card failed %d\n", ret_val);
453 		return ret_val;
454 	}
455 	platform_set_drvdata(pdev, &snd_soc_card_cht);
456 	return ret_val;
457 }
458 
459 static struct platform_driver snd_cht_mc_driver = {
460 	.driver = {
461 		.name = "cht-bsw-rt5672",
462 	},
463 	.probe = snd_cht_mc_probe,
464 };
465 
466 module_platform_driver(snd_cht_mc_driver);
467 
468 MODULE_DESCRIPTION("ASoC Intel(R) Baytrail CR Machine driver");
469 MODULE_AUTHOR("Subhransu S. Prusty, Mengdong Lin");
470 MODULE_LICENSE("GPL v2");
471 MODULE_ALIAS("platform:cht-bsw-rt5672");
472