1/*
2 * wm8728.c  --  WM8728 ALSA SoC Audio driver
3 *
4 * Copyright 2008 Wolfson Microelectronics plc
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/pm.h>
18#include <linux/i2c.h>
19#include <linux/platform_device.h>
20#include <linux/regmap.h>
21#include <linux/spi/spi.h>
22#include <linux/slab.h>
23#include <linux/of_device.h>
24#include <sound/core.h>
25#include <sound/pcm.h>
26#include <sound/pcm_params.h>
27#include <sound/soc.h>
28#include <sound/initval.h>
29#include <sound/tlv.h>
30
31#include "wm8728.h"
32
33/*
34 * We can't read the WM8728 register space so we cache them instead.
35 * Note that the defaults here aren't the physical defaults, we latch
36 * the volume update bits, mute the output and enable infinite zero
37 * detect.
38 */
39static const struct reg_default wm8728_reg_defaults[] = {
40	{ 0, 0x1ff },
41	{ 1, 0x1ff },
42	{ 2, 0x001 },
43	{ 3, 0x100 },
44};
45
46/* codec private data */
47struct wm8728_priv {
48	struct regmap *regmap;
49};
50
51static const DECLARE_TLV_DB_SCALE(wm8728_tlv, -12750, 50, 1);
52
53static const struct snd_kcontrol_new wm8728_snd_controls[] = {
54
55SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8728_DACLVOL, WM8728_DACRVOL,
56		 0, 255, 0, wm8728_tlv),
57
58SOC_SINGLE("Deemphasis", WM8728_DACCTL, 1, 1, 0),
59};
60
61/*
62 * DAPM controls.
63 */
64static const struct snd_soc_dapm_widget wm8728_dapm_widgets[] = {
65SND_SOC_DAPM_DAC("DAC", "HiFi Playback", SND_SOC_NOPM, 0, 0),
66SND_SOC_DAPM_OUTPUT("VOUTL"),
67SND_SOC_DAPM_OUTPUT("VOUTR"),
68};
69
70static const struct snd_soc_dapm_route wm8728_intercon[] = {
71	{"VOUTL", NULL, "DAC"},
72	{"VOUTR", NULL, "DAC"},
73};
74
75static int wm8728_mute(struct snd_soc_dai *dai, int mute)
76{
77	struct snd_soc_codec *codec = dai->codec;
78	u16 mute_reg = snd_soc_read(codec, WM8728_DACCTL);
79
80	if (mute)
81		snd_soc_write(codec, WM8728_DACCTL, mute_reg | 1);
82	else
83		snd_soc_write(codec, WM8728_DACCTL, mute_reg & ~1);
84
85	return 0;
86}
87
88static int wm8728_hw_params(struct snd_pcm_substream *substream,
89	struct snd_pcm_hw_params *params,
90	struct snd_soc_dai *dai)
91{
92	struct snd_soc_codec *codec = dai->codec;
93	u16 dac = snd_soc_read(codec, WM8728_DACCTL);
94
95	dac &= ~0x18;
96
97	switch (params_width(params)) {
98	case 16:
99		break;
100	case 20:
101		dac |= 0x10;
102		break;
103	case 24:
104		dac |= 0x08;
105		break;
106	default:
107		return -EINVAL;
108	}
109
110	snd_soc_write(codec, WM8728_DACCTL, dac);
111
112	return 0;
113}
114
115static int wm8728_set_dai_fmt(struct snd_soc_dai *codec_dai,
116		unsigned int fmt)
117{
118	struct snd_soc_codec *codec = codec_dai->codec;
119	u16 iface = snd_soc_read(codec, WM8728_IFCTL);
120
121	/* Currently only I2S is supported by the driver, though the
122	 * hardware is more flexible.
123	 */
124	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
125	case SND_SOC_DAIFMT_I2S:
126		iface |= 1;
127		break;
128	default:
129		return -EINVAL;
130	}
131
132	/* The hardware only support full slave mode */
133	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
134	case SND_SOC_DAIFMT_CBS_CFS:
135		break;
136	default:
137		return -EINVAL;
138	}
139
140	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
141	case SND_SOC_DAIFMT_NB_NF:
142		iface &= ~0x22;
143		break;
144	case SND_SOC_DAIFMT_IB_NF:
145		iface |=  0x20;
146		iface &= ~0x02;
147		break;
148	case SND_SOC_DAIFMT_NB_IF:
149		iface |= 0x02;
150		iface &= ~0x20;
151		break;
152	case SND_SOC_DAIFMT_IB_IF:
153		iface |= 0x22;
154		break;
155	default:
156		return -EINVAL;
157	}
158
159	snd_soc_write(codec, WM8728_IFCTL, iface);
160	return 0;
161}
162
163static int wm8728_set_bias_level(struct snd_soc_codec *codec,
164				 enum snd_soc_bias_level level)
165{
166	struct wm8728_priv *wm8728 = snd_soc_codec_get_drvdata(codec);
167	u16 reg;
168
169	switch (level) {
170	case SND_SOC_BIAS_ON:
171	case SND_SOC_BIAS_PREPARE:
172	case SND_SOC_BIAS_STANDBY:
173		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
174			/* Power everything up... */
175			reg = snd_soc_read(codec, WM8728_DACCTL);
176			snd_soc_write(codec, WM8728_DACCTL, reg & ~0x4);
177
178			/* ..then sync in the register cache. */
179			regcache_sync(wm8728->regmap);
180		}
181		break;
182
183	case SND_SOC_BIAS_OFF:
184		reg = snd_soc_read(codec, WM8728_DACCTL);
185		snd_soc_write(codec, WM8728_DACCTL, reg | 0x4);
186		break;
187	}
188	codec->dapm.bias_level = level;
189	return 0;
190}
191
192#define WM8728_RATES (SNDRV_PCM_RATE_8000_192000)
193
194#define WM8728_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
195	SNDRV_PCM_FMTBIT_S24_LE)
196
197static const struct snd_soc_dai_ops wm8728_dai_ops = {
198	.hw_params	= wm8728_hw_params,
199	.digital_mute	= wm8728_mute,
200	.set_fmt	= wm8728_set_dai_fmt,
201};
202
203static struct snd_soc_dai_driver wm8728_dai = {
204	.name = "wm8728-hifi",
205	.playback = {
206		.stream_name = "Playback",
207		.channels_min = 2,
208		.channels_max = 2,
209		.rates = WM8728_RATES,
210		.formats = WM8728_FORMATS,
211	},
212	.ops = &wm8728_dai_ops,
213};
214
215static struct snd_soc_codec_driver soc_codec_dev_wm8728 = {
216	.set_bias_level = wm8728_set_bias_level,
217	.suspend_bias_off = true,
218
219	.controls = wm8728_snd_controls,
220	.num_controls = ARRAY_SIZE(wm8728_snd_controls),
221	.dapm_widgets = wm8728_dapm_widgets,
222	.num_dapm_widgets = ARRAY_SIZE(wm8728_dapm_widgets),
223	.dapm_routes = wm8728_intercon,
224	.num_dapm_routes = ARRAY_SIZE(wm8728_intercon),
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_RBTREE,
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 = snd_soc_register_codec(&spi->dev,
261			&soc_codec_dev_wm8728, &wm8728_dai, 1);
262
263	return ret;
264}
265
266static int wm8728_spi_remove(struct spi_device *spi)
267{
268	snd_soc_unregister_codec(&spi->dev);
269
270	return 0;
271}
272
273static struct spi_driver wm8728_spi_driver = {
274	.driver = {
275		.name	= "wm8728",
276		.owner	= THIS_MODULE,
277		.of_match_table = wm8728_of_match,
278	},
279	.probe		= wm8728_spi_probe,
280	.remove		= wm8728_spi_remove,
281};
282#endif /* CONFIG_SPI_MASTER */
283
284#if IS_ENABLED(CONFIG_I2C)
285static int wm8728_i2c_probe(struct i2c_client *i2c,
286			    const struct i2c_device_id *id)
287{
288	struct wm8728_priv *wm8728;
289	int ret;
290
291	wm8728 = devm_kzalloc(&i2c->dev, sizeof(struct wm8728_priv),
292			      GFP_KERNEL);
293	if (wm8728 == NULL)
294		return -ENOMEM;
295
296	wm8728->regmap = devm_regmap_init_i2c(i2c, &wm8728_regmap);
297	if (IS_ERR(wm8728->regmap))
298		return PTR_ERR(wm8728->regmap);
299
300	i2c_set_clientdata(i2c, wm8728);
301
302	ret =  snd_soc_register_codec(&i2c->dev,
303			&soc_codec_dev_wm8728, &wm8728_dai, 1);
304
305	return ret;
306}
307
308static int wm8728_i2c_remove(struct i2c_client *client)
309{
310	snd_soc_unregister_codec(&client->dev);
311	return 0;
312}
313
314static const struct i2c_device_id wm8728_i2c_id[] = {
315	{ "wm8728", 0 },
316	{ }
317};
318MODULE_DEVICE_TABLE(i2c, wm8728_i2c_id);
319
320static struct i2c_driver wm8728_i2c_driver = {
321	.driver = {
322		.name = "wm8728",
323		.owner = THIS_MODULE,
324		.of_match_table = wm8728_of_match,
325	},
326	.probe =    wm8728_i2c_probe,
327	.remove =   wm8728_i2c_remove,
328	.id_table = wm8728_i2c_id,
329};
330#endif
331
332static int __init wm8728_modinit(void)
333{
334	int ret = 0;
335#if IS_ENABLED(CONFIG_I2C)
336	ret = i2c_add_driver(&wm8728_i2c_driver);
337	if (ret != 0) {
338		printk(KERN_ERR "Failed to register wm8728 I2C driver: %d\n",
339		       ret);
340	}
341#endif
342#if defined(CONFIG_SPI_MASTER)
343	ret = spi_register_driver(&wm8728_spi_driver);
344	if (ret != 0) {
345		printk(KERN_ERR "Failed to register wm8728 SPI driver: %d\n",
346		       ret);
347	}
348#endif
349	return ret;
350}
351module_init(wm8728_modinit);
352
353static void __exit wm8728_exit(void)
354{
355#if IS_ENABLED(CONFIG_I2C)
356	i2c_del_driver(&wm8728_i2c_driver);
357#endif
358#if defined(CONFIG_SPI_MASTER)
359	spi_unregister_driver(&wm8728_spi_driver);
360#endif
361}
362module_exit(wm8728_exit);
363
364MODULE_DESCRIPTION("ASoC WM8728 driver");
365MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
366MODULE_LICENSE("GPL");
367