wm8728.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * wm8728.c  --  WM8728 ALSA SoC Audio driver
  4 *
  5 * Copyright 2008 Wolfson Microelectronics plc
  6 *
  7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  8 */
  9
 10#include <linux/mod_devicetable.h>
 11#include <linux/module.h>
 12#include <linux/moduleparam.h>
 13#include <linux/init.h>
 14#include <linux/delay.h>
 15#include <linux/pm.h>
 16#include <linux/i2c.h>
 17#include <linux/platform_device.h>
 18#include <linux/regmap.h>
 19#include <linux/spi/spi.h>
 20#include <linux/slab.h>
 21#include <sound/core.h>
 22#include <sound/pcm.h>
 23#include <sound/pcm_params.h>
 24#include <sound/soc.h>
 25#include <sound/initval.h>
 26#include <sound/tlv.h>
 27
 28#include "wm8728.h"
 29
 30/*
 31 * We can't read the WM8728 register space so we cache them instead.
 32 * Note that the defaults here aren't the physical defaults, we latch
 33 * the volume update bits, mute the output and enable infinite zero
 34 * detect.
 35 */
 36static const struct reg_default wm8728_reg_defaults[] = {
 37	{ 0, 0x1ff },
 38	{ 1, 0x1ff },
 39	{ 2, 0x001 },
 40	{ 3, 0x100 },
 41};
 42
 43/* codec private data */
 44struct wm8728_priv {
 45	struct regmap *regmap;
 46};
 47
 48static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
 49
 50static const struct snd_kcontrol_new wm8728_snd_controls[] = {
 51
 52SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
 53		 0, 255, 0, wm8728_tlv),
 54
 55SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
 56};
 57
 58/*
 59 * DAPM controls.
 60 */
 61static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
 62SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
 63SND_SOC_DAPM_OUTPUT("VOUTL"),
 64SND_SOC_DAPM_OUTPUT("VOUTR"),
 65};
 66
 67static const struct snd_soc_dapm_route wm8728_intercon[] = {
 68	{"VOUTL", NULL, "DAC"},
 69	{"VOUTR", NULL, "DAC"},
 70};
 71
 72static int wm8728_mute(struct snd_soc_dai *dai, int mute, int direction)
 73{
 74	struct snd_soc_component *component = dai->component;
 75	u16 mute_reg = snd_soc_component_read(component, WM8728_DACCTL);
 76
 77	if (mute)
 78		snd_soc_component_write(component, WM8728_DACCTL, mute_reg | 1);
 79	else
 80		snd_soc_component_write(component, WM8728_DACCTL, mute_reg & ~1);
 81
 82	return 0;
 83}
 84
 85static int wm8728_hw_params(struct snd_pcm_substream *substream,
 86	struct snd_pcm_hw_params *params,
 87	struct snd_soc_dai *dai)
 88{
 89	struct snd_soc_component *component = dai->component;
 90	u16 dac = snd_soc_component_read(component, WM8728_DACCTL);
 91
 92	dac &= ~0x18;
 93
 94	switch (params_width(params)) {
 95	case 16:
 96		break;
 97	case 20:
 98		dac |= 0x10;
 99		break;
100	case 24:
101		dac |= 0x08;
102		break;
103	default:
104		return -EINVAL;
105	}
106
107	snd_soc_component_write(component, WM8728_DACCTL, dac);
108
109	return 0;
110}
111
112static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
113		unsigned int fmt)
114{
115	struct snd_soc_component *component = codec_dai->component;
116	u16 iface = snd_soc_component_read(component, WM8728_IFCTL);
117
118	/* Currently only I2S is supported by the driver, though the
119	 * hardware is more flexible.
120	 */
121	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
122	case SND_SOC_DAIFMT_I2S:
123		iface |= 1;
124		break;
125	default:
126		return -EINVAL;
127	}
128
129	/* The hardware only support full slave mode */
130	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
131	case SND_SOC_DAIFMT_CBC_CFC:
132		break;
133	default:
134		return -EINVAL;
135	}
136
137	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
138	case SND_SOC_DAIFMT_NB_NF:
139		iface &= ~0x22;
140		break;
141	case SND_SOC_DAIFMT_IB_NF:
142		iface |=  0x20;
143		iface &= ~0x02;
144		break;
145	case SND_SOC_DAIFMT_NB_IF:
146		iface |= 0x02;
147		iface &= ~0x20;
148		break;
149	case SND_SOC_DAIFMT_IB_IF:
150		iface |= 0x22;
151		break;
152	default:
153		return -EINVAL;
154	}
155
156	snd_soc_component_write(component, WM8728_IFCTL, iface);
157	return 0;
158}
159
160static int wm8728_set_bias_level(struct snd_soc_component *component,
161				 enum snd_soc_bias_level level)
162{
163	struct wm8728_priv *wm8728 = snd_soc_component_get_drvdata(component);
164	struct snd_soc_dapm_context *dapm = snd_soc_component_to_dapm(component);
165	u16 reg;
166
167	switch (level) {
168	case SND_SOC_BIAS_ON:
169	case SND_SOC_BIAS_PREPARE:
170	case SND_SOC_BIAS_STANDBY:
171		if (snd_soc_dapm_get_bias_level(dapm) == SND_SOC_BIAS_OFF) {
172			/* Power everything up... */
173			reg = snd_soc_component_read(component, WM8728_DACCTL);
174			snd_soc_component_write(component, WM8728_DACCTL, reg & ~0x4);
175
176			/* ..then sync in the register cache. */
177			regcache_sync(wm8728->regmap);
178		}
179		break;
180
181	case SND_SOC_BIAS_OFF:
182		reg = snd_soc_component_read(component, WM8728_DACCTL);
183		snd_soc_component_write(component, WM8728_DACCTL, reg | 0x4);
184		break;
185	}
186	return 0;
187}
188
189#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
190
191#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
192	SNDRV_PCM_FMTBIT_S24_LE)
193
194static const struct snd_soc_dai_ops wm8728_dai_ops = {
195	.hw_params	= wm8728_hw_params,
196	.mute_stream	= wm8728_mute,
197	.set_fmt	= wm8728_set_dai_fmt,
198	.no_capture_mute = 1,
199};
200
201static struct snd_soc_dai_driver wm8728_dai = {
202	.name = "wm8728-hifi",
203	.playback = {
204		.stream_name = "Playback",
205		.channels_min = 2,
206		.channels_max = 2,
207		.rates = WM8728_RATES,
208		.formats = WM8728_FORMATS,
209	},
210	.ops = &wm8728_dai_ops,
211};
212
213static const struct snd_soc_component_driver soc_component_dev_wm8728 = {
214	.set_bias_level		= wm8728_set_bias_level,
215	.controls		= wm8728_snd_controls,
216	.num_controls		= ARRAY_SIZE(wm8728_snd_controls),
217	.dapm_widgets		= wm8728_dapm_widgets,
218	.num_dapm_widgets	= ARRAY_SIZE(wm8728_dapm_widgets),
219	.dapm_routes		= wm8728_intercon,
220	.num_dapm_routes	= ARRAY_SIZE(wm8728_intercon),
221	.suspend_bias_off	= 1,
222	.idle_bias_on		= 1,
223	.use_pmdown_time	= 1,
224	.endianness		= 1,
225};
226
227static const struct of_device_id wm8728_of_match[] = {
228	{ .compatible = "wlf,wm8728", },
229	{ }
230};
231MODULE_DEVICE_TABLE(of, wm8728_of_match);
232
233static const struct regmap_config wm8728_regmap = {
234	.reg_bits = 7,
235	.val_bits = 9,
236	.max_register = WM8728_IFCTL,
237
238	.reg_defaults = wm8728_reg_defaults,
239	.num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
240	.cache_type = REGCACHE_MAPLE,
241};
242
243#if defined(CONFIG_SPI_MASTER)
244static int wm8728_spi_probe(struct spi_device *spi)
245{
246	struct wm8728_priv *wm8728;
247	int ret;
248
249	wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
250			      GFP_KERNEL);
251	if (wm8728 == NULL)
252		return -ENOMEM;
253
254	wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
255	if (IS_ERR(wm8728->regmap))
256		return PTR_ERR(wm8728->regmap);
257
258	spi_set_drvdata(spi, wm8728);
259
260	ret = devm_snd_soc_register_component(&spi->dev,
261			&soc_component_dev_wm8728, &wm8728_dai, 1);
262
263	return ret;
264}
265
266static struct spi_driver wm8728_spi_driver = {
267	.driver = {
268		.name	= "wm8728",
269		.of_match_table = wm8728_of_match,
270	},
271	.probe		= wm8728_spi_probe,
272};
273#endif /* CONFIG_SPI_MASTER */
274
275#if IS_ENABLED(CONFIG_I2C)
276static int wm8728_i2c_probe(struct i2c_client *i2c)
277{
278	struct wm8728_priv *wm8728;
279	int ret;
280
281	wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
282			      GFP_KERNEL);
283	if (wm8728 == NULL)
284		return -ENOMEM;
285
286	wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
287	if (IS_ERR(wm8728->regmap))
288		return PTR_ERR(wm8728->regmap);
289
290	i2c_set_clientdata(i2c, wm8728);
291
292	ret =  devm_snd_soc_register_component(&i2c->dev,
293			&soc_component_dev_wm8728, &wm8728_dai, 1);
294
295	return ret;
296}
297
298static const struct i2c_device_id wm8728_i2c_id[] = {
299	{ "wm8728" },
300	{ }
301};
302MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
303
304static struct i2c_driver wm8728_i2c_driver = {
305	.driver = {
306		.name = "wm8728",
307		.of_match_table = wm8728_of_match,
308	},
309	.probe = wm8728_i2c_probe,
310	.id_table = wm8728_i2c_id,
311};
312#endif
313
314static int __init wm8728_modinit(void)
315{
316	int ret = 0;
317#if IS_ENABLED(CONFIG_I2C)
318	ret = i2c_add_driver(&wm8728_i2c_driver);
319	if (ret != 0) {
320		printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
321		       ret);
322	}
323#endif
324#if defined(CONFIG_SPI_MASTER)
325	ret = spi_register_driver(&wm8728_spi_driver);
326	if (ret != 0) {
327		printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
328		       ret);
329	}
330#endif
331	return ret;
332}
333module_init(wm8728_modinit);
334
335static void __exit wm8728_exit(void)
336{
337#if IS_ENABLED(CONFIG_I2C)
338	i2c_del_driver(&wm8728_i2c_driver);
339#endif
340#if defined(CONFIG_SPI_MASTER)
341	spi_unregister_driver(&wm8728_spi_driver);
342#endif
343}
344module_exit(wm8728_exit);
345
346MODULE_DESCRIPTION("ASoC WM8728 driver");
347MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
348MODULE_LICENSE("GPL");