1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * wm8524.c  --  WM8524 ALSA SoC Audio driver
  4 *
  5 * Copyright 2009 Wolfson Microelectronics plc
  6 * Copyright 2017 NXP
  7 *
  8 * Based on WM8523 ALSA SoC Audio driver written by Mark Brown
  9 */
 10
 11#include <linux/mod_devicetable.h>
 12#include <linux/module.h>
 13#include <linux/moduleparam.h>
 14#include <linux/init.h>
 15#include <linux/delay.h>
 16#include <linux/slab.h>
 17#include <linux/gpio/consumer.h>
 18#include <sound/core.h>
 19#include <sound/pcm.h>
 20#include <sound/pcm_params.h>
 21#include <sound/soc.h>
 22#include <sound/initval.h>
 23
 24#define WM8524_NUM_RATES 7
 25
 26/* codec private data */
 27struct wm8524_priv {
 28	struct gpio_desc *mute;
 29	unsigned int sysclk;
 30	unsigned int rate_constraint_list[WM8524_NUM_RATES];
 31	struct snd_pcm_hw_constraint_list rate_constraint;
 32};
 33
 34
 35static const struct snd_soc_dapm_widget wm8524_dapm_widgets[] = {
 36SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
 37SND_SOC_DAPM_OUTPUT("LINEVOUTL"),
 38SND_SOC_DAPM_OUTPUT("LINEVOUTR"),
 39};
 40
 41static const struct snd_soc_dapm_route wm8524_dapm_routes[] = {
 42	{ "LINEVOUTL", NULL, "DAC" },
 43	{ "LINEVOUTR", NULL, "DAC" },
 44};
 45
 46static const struct {
 47	int value;
 48	int ratio;
 49} lrclk_ratios[WM8524_NUM_RATES] = {
 50	{ 1, 128 },
 51	{ 2, 192 },
 52	{ 3, 256 },
 53	{ 4, 384 },
 54	{ 5, 512 },
 55	{ 6, 768 },
 56	{ 7, 1152 },
 57};
 58
 59static int wm8524_startup(struct snd_pcm_substream *substream,
 60			  struct snd_soc_dai *dai)
 61{
 62	struct snd_soc_component *component = dai->component;
 63	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
 64
 65	/* The set of sample rates that can be supported depends on the
 66	 * MCLK supplied to the CODEC - enforce this.
 67	 */
 68	if (!wm8524->sysclk) {
 69		dev_err(component->dev,
 70			"No MCLK configured, call set_sysclk() on init\n");
 71		return -EINVAL;
 72	}
 73
 74	snd_pcm_hw_constraint_list(substream->runtime, 0,
 75				   SNDRV_PCM_HW_PARAM_RATE,
 76				   &wm8524->rate_constraint);
 77
 78	gpiod_set_value_cansleep(wm8524->mute, 1);
 79
 80	return 0;
 81}
 82
 83static void wm8524_shutdown(struct snd_pcm_substream *substream,
 84			  struct snd_soc_dai *dai)
 85{
 86	struct snd_soc_component *component = dai->component;
 87	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
 88
 89	gpiod_set_value_cansleep(wm8524->mute, 0);
 90}
 91
 92static int wm8524_set_dai_sysclk(struct snd_soc_dai *codec_dai,
 93		int clk_id, unsigned int freq, int dir)
 94{
 95	struct snd_soc_component *component = codec_dai->component;
 96	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
 97	unsigned int val;
 98	int i, j = 0;
 99
100	wm8524->sysclk = freq;
101
102	wm8524->rate_constraint.count = 0;
103	for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
104		val = freq / lrclk_ratios[i].ratio;
105		/* Check that it's a standard rate since core can't
106		 * cope with others and having the odd rates confuses
107		 * constraint matching.
108		 */
109		switch (val) {
110		case 8000:
111		case 32000:
112		case 44100:
113		case 48000:
114		case 88200:
115		case 96000:
116		case 176400:
117		case 192000:
118			dev_dbg(component->dev, "Supported sample rate: %dHz\n",
119				val);
120			wm8524->rate_constraint_list[j++] = val;
121			wm8524->rate_constraint.count++;
122			break;
123		default:
124			dev_dbg(component->dev, "Skipping sample rate: %dHz\n",
125				val);
126		}
127	}
128
129	/* Need at least one supported rate... */
130	if (wm8524->rate_constraint.count == 0)
131		return -EINVAL;
132
133	return 0;
134}
135
136static int wm8524_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
137{
138	fmt &= (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK |
139		SND_SOC_DAIFMT_MASTER_MASK);
140
141	if (fmt != (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
142		    SND_SOC_DAIFMT_CBS_CFS)) {
143		dev_err(codec_dai->dev, "Invalid DAI format\n");
144		return -EINVAL;
145	}
146
147	return 0;
148}
149
150static int wm8524_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
151{
152	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(dai->component);
153
154	if (wm8524->mute)
155		gpiod_set_value_cansleep(wm8524->mute, mute);
156
157	return 0;
158}
159
160#define WM8524_RATES SNDRV_PCM_RATE_8000_192000
161
162#define WM8524_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
163			SNDRV_PCM_FMTBIT_S24_LE |\
164			SNDRV_PCM_FMTBIT_S32_LE)
165
166static const struct snd_soc_dai_ops wm8524_dai_ops = {
167	.startup	= wm8524_startup,
168	.shutdown	= wm8524_shutdown,
169	.set_sysclk	= wm8524_set_dai_sysclk,
170	.set_fmt	= wm8524_set_fmt,
171	.mute_stream	= wm8524_mute_stream,
172};
173
174static struct snd_soc_dai_driver wm8524_dai = {
175	.name = "wm8524-hifi",
176	.playback = {
177		.stream_name = "Playback",
178		.channels_min = 2,
179		.channels_max = 2,
180		.rates = WM8524_RATES,
181		.formats = WM8524_FORMATS,
182	},
183	.ops = &wm8524_dai_ops,
184};
185
186static int wm8524_probe(struct snd_soc_component *component)
187{
188	struct wm8524_priv *wm8524 = snd_soc_component_get_drvdata(component);
189
190	wm8524->rate_constraint.list = &wm8524->rate_constraint_list[0];
191	wm8524->rate_constraint.count =
192		ARRAY_SIZE(wm8524->rate_constraint_list);
193
194	return 0;
195}
196
197static const struct snd_soc_component_driver soc_component_dev_wm8524 = {
198	.probe			= wm8524_probe,
199	.dapm_widgets		= wm8524_dapm_widgets,
200	.num_dapm_widgets	= ARRAY_SIZE(wm8524_dapm_widgets),
201	.dapm_routes		= wm8524_dapm_routes,
202	.num_dapm_routes	= ARRAY_SIZE(wm8524_dapm_routes),
203	.idle_bias_on		= 1,
204	.use_pmdown_time	= 1,
205	.endianness		= 1,
206};
207
208static const struct of_device_id wm8524_of_match[] = {
209	{ .compatible = "wlf,wm8524" },
210	{ /* sentinel*/ }
211};
212MODULE_DEVICE_TABLE(of, wm8524_of_match);
213
214static int wm8524_codec_probe(struct platform_device *pdev)
215{
216	struct wm8524_priv *wm8524;
217	int ret;
218
219	wm8524 = devm_kzalloc(&pdev->dev, sizeof(struct wm8524_priv),
220						  GFP_KERNEL);
221	if (wm8524 == NULL)
222		return -ENOMEM;
223
224	platform_set_drvdata(pdev, wm8524);
225
226	wm8524->mute = devm_gpiod_get(&pdev->dev, "wlf,mute", GPIOD_OUT_LOW);
227	if (IS_ERR(wm8524->mute)) {
228		ret = PTR_ERR(wm8524->mute);
229		dev_err_probe(&pdev->dev, ret, "Failed to get mute line\n");
230		return ret;
231	}
232
233	ret = devm_snd_soc_register_component(&pdev->dev,
234			&soc_component_dev_wm8524, &wm8524_dai, 1);
235	if (ret < 0)
236		dev_err(&pdev->dev, "Failed to register component: %d\n", ret);
237
238	return ret;
239}
240
241static struct platform_driver wm8524_codec_driver = {
242	.probe		= wm8524_codec_probe,
243	.driver		= {
244		.name	= "wm8524-codec",
245		.of_match_table = wm8524_of_match,
246	},
247};
248module_platform_driver(wm8524_codec_driver);
249
250MODULE_DESCRIPTION("ASoC WM8524 driver");
251MODULE_AUTHOR("Mihai Serban <mihai.serban@nxp.com>");
252MODULE_ALIAS("platform:wm8524-codec");
253MODULE_LICENSE("GPL");