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_CBS_CFS:
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	u16 reg;
165
166	switch (level) {
167	case SND_SOC_BIAS_ON:
168	case SND_SOC_BIAS_PREPARE:
169	case SND_SOC_BIAS_STANDBY:
170		if (snd_soc_component_get_bias_level(component) == SND_SOC_BIAS_OFF) {
171			/* Power everything up... */
172			reg = snd_soc_component_read(component, WM8728_DACCTL);
173			snd_soc_component_write(component, WM8728_DACCTL, reg & ~0x4);
174
175			/* ..then sync in the register cache. */
176			regcache_sync(wm8728->regmap);
177		}
178		break;
179
180	case SND_SOC_BIAS_OFF:
181		reg = snd_soc_component_read(component, WM8728_DACCTL);
182		snd_soc_component_write(component, WM8728_DACCTL, reg | 0x4);
183		break;
184	}
185	return 0;
186}
187
188#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
189
190#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
191	SNDRV_PCM_FMTBIT_S24_LE)
192
193static const struct snd_soc_dai_ops wm8728_dai_ops = {
194	.hw_params	= wm8728_hw_params,
195	.mute_stream	= wm8728_mute,
196	.set_fmt	= wm8728_set_dai_fmt,
197	.no_capture_mute = 1,
198};
199
200static struct snd_soc_dai_driver wm8728_dai = {
201	.name = "wm8728-hifi",
202	.playback = {
203		.stream_name = "Playback",
204		.channels_min = 2,
205		.channels_max = 2,
206		.rates = WM8728_RATES,
207		.formats = WM8728_FORMATS,
208	},
209	.ops = &wm8728_dai_ops,
210};
211
212static const struct snd_soc_component_driver soc_component_dev_wm8728 = {
213	.set_bias_level		= wm8728_set_bias_level,
214	.controls		= wm8728_snd_controls,
215	.num_controls		= ARRAY_SIZE(wm8728_snd_controls),
216	.dapm_widgets		= wm8728_dapm_widgets,
217	.num_dapm_widgets	= ARRAY_SIZE(wm8728_dapm_widgets),
218	.dapm_routes		= wm8728_intercon,
219	.num_dapm_routes	= ARRAY_SIZE(wm8728_intercon),
220	.suspend_bias_off	= 1,
221	.idle_bias_on		= 1,
222	.use_pmdown_time	= 1,
223	.endianness		= 1,
224};
225
226static const struct of_device_id wm8728_of_match[] = {
227	{ .compatible = "wlf,wm8728", },
228	{ }
229};
230MODULE_DEVICE_TABLE(of, wm8728_of_match);
231
232static const struct regmap_config wm8728_regmap = {
233	.reg_bits = 7,
234	.val_bits = 9,
235	.max_register = WM8728_IFCTL,
236
237	.reg_defaults = wm8728_reg_defaults,
238	.num_reg_defaults = ARRAY_SIZE(wm8728_reg_defaults),
239	.cache_type = REGCACHE_MAPLE,
240};
241
242#if defined(CONFIG_SPI_MASTER)
243static int wm8728_spi_probe(struct spi_device *spi)
244{
245	struct wm8728_priv *wm8728;
246	int ret;
247
248	wm8728 = devm_kzalloc(&spi->dev, sizeof(struct wm8728_priv),
249			      GFP_KERNEL);
250	if (wm8728 == NULL)
251		return -ENOMEM;
252
253	wm8728->regmap = devm_regmap_init_spi(spi, &wm8728_regmap);
254	if (IS_ERR(wm8728->regmap))
255		return PTR_ERR(wm8728->regmap);
256
257	spi_set_drvdata(spi, wm8728);
258
259	ret = devm_snd_soc_register_component(&spi->dev,
260			&soc_component_dev_wm8728, &wm8728_dai, 1);
261
262	return ret;
263}
264
265static struct spi_driver wm8728_spi_driver = {
266	.driver = {
267		.name	= "wm8728",
268		.of_match_table = wm8728_of_match,
269	},
270	.probe		= wm8728_spi_probe,
271};
272#endif /* CONFIG_SPI_MASTER */
273
274#if IS_ENABLED(CONFIG_I2C)
275static int wm8728_i2c_probe(struct i2c_client *i2c)
276{
277	struct wm8728_priv *wm8728;
278	int ret;
279
280	wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
281			      GFP_KERNEL);
282	if (wm8728 == NULL)
283		return -ENOMEM;
284
285	wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
286	if (IS_ERR(wm8728->regmap))
287		return PTR_ERR(wm8728->regmap);
288
289	i2c_set_clientdata(i2c, wm8728);
290
291	ret =  devm_snd_soc_register_component(&i2c->dev,
292			&soc_component_dev_wm8728, &wm8728_dai, 1);
293
294	return ret;
295}
296
297static const struct i2c_device_id wm8728_i2c_id[] = {
298	{ "wm8728", 0 },
299	{ }
300};
301MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
302
303static struct i2c_driver wm8728_i2c_driver = {
304	.driver = {
305		.name = "wm8728",
306		.of_match_table = wm8728_of_match,
307	},
308	.probe = wm8728_i2c_probe,
309	.id_table = wm8728_i2c_id,
310};
311#endif
312
313static int __init wm8728_modinit(void)
314{
315	int ret = 0;
316#if IS_ENABLED(CONFIG_I2C)
317	ret = i2c_add_driver(&wm8728_i2c_driver);
318	if (ret != 0) {
319		printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
320		       ret);
321	}
322#endif
323#if defined(CONFIG_SPI_MASTER)
324	ret = spi_register_driver(&wm8728_spi_driver);
325	if (ret != 0) {
326		printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
327		       ret);
328	}
329#endif
330	return ret;
331}
332module_init(wm8728_modinit);
333
334static void __exit wm8728_exit(void)
335{
336#if IS_ENABLED(CONFIG_I2C)
337	i2c_del_driver(&wm8728_i2c_driver);
338#endif
339#if defined(CONFIG_SPI_MASTER)
340	spi_unregister_driver(&wm8728_spi_driver);
341#endif
342}
343module_exit(wm8728_exit);
344
345MODULE_DESCRIPTION("ASoC WM8728 driver");
346MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
347MODULE_LICENSE("GPL");
348