1/*
2 * max9850.c  --  codec driver for max9850
3 *
4 * Copyright (C) 2011 taskit GmbH
5 *
6 * Author: Christian Glindkamp <christian.glindkamp@taskit.de>
7 *
8 * Initial development of this code was funded by
9 * MICRONIC Computer Systeme GmbH, http://www.mcsberlin.de/
10 *
11 * This program is free software; you can redistribute  it and/or modify it
12 * under  the terms of  the GNU General  Public License as published by the
13 * Free Software Foundation;  either version 2 of the  License, or (at your
14 * option) any later version.
15 *
16 */
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/i2c.h>
21#include <linux/regmap.h>
22#include <linux/slab.h>
23#include <sound/pcm.h>
24#include <sound/pcm_params.h>
25#include <sound/soc.h>
26#include <sound/tlv.h>
27
28#include "max9850.h"
29
30struct max9850_priv {
31	struct regmap *regmap;
32	unsigned int sysclk;
33};
34
35/* max9850 register cache */
36static const struct reg_default max9850_reg[] = {
37	{  2, 0x0c },
38	{  3, 0x00 },
39	{  4, 0x00 },
40	{  5, 0x00 },
41	{  6, 0x00 },
42	{  7, 0x00 },
43	{  8, 0x00 },
44	{  9, 0x00 },
45	{ 10, 0x00 },
46};
47
48/* these registers are not used at the moment but provided for the sake of
49 * completeness */
50static bool max9850_volatile_register(struct device *dev, unsigned int reg)
51{
52	switch (reg) {
53	case MAX9850_STATUSA:
54	case MAX9850_STATUSB:
55		return 1;
56	default:
57		return 0;
58	}
59}
60
61static const struct regmap_config max9850_regmap = {
62	.reg_bits = 8,
63	.val_bits = 8,
64
65	.max_register = MAX9850_DIGITAL_AUDIO,
66	.volatile_reg = max9850_volatile_register,
67	.cache_type = REGCACHE_RBTREE,
68};
69
70static const DECLARE_TLV_DB_RANGE(max9850_tlv,
71	0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
72	0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
73	0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
74	0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0)
75);
76
77static const struct snd_kcontrol_new max9850_controls[] = {
78SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
79SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
80SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
81};
82
83static const struct snd_kcontrol_new max9850_mixer_controls[] = {
84	SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
85};
86
87static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
88SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
89SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
90SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
91SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
92SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
93		&max9850_mixer_controls[0],
94		ARRAY_SIZE(max9850_mixer_controls)),
95SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
96SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
97SND_SOC_DAPM_OUTPUT("OUTL"),
98SND_SOC_DAPM_OUTPUT("HPL"),
99SND_SOC_DAPM_OUTPUT("OUTR"),
100SND_SOC_DAPM_OUTPUT("HPR"),
101SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
102SND_SOC_DAPM_INPUT("INL"),
103SND_SOC_DAPM_INPUT("INR"),
104};
105
106static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
107	/* output mixer */
108	{"Output Mixer", NULL, "DAC"},
109	{"Output Mixer", "Line In Switch", "Line Input"},
110
111	/* outputs */
112	{"Headphone Output", NULL, "Output Mixer"},
113	{"HPL", NULL, "Headphone Output"},
114	{"HPR", NULL, "Headphone Output"},
115	{"OUTL", NULL, "Output Mixer"},
116	{"OUTR", NULL, "Output Mixer"},
117
118	/* inputs */
119	{"Line Input", NULL, "INL"},
120	{"Line Input", NULL, "INR"},
121
122	/* supplies */
123	{"Output Mixer", NULL, "Charge Pump 1"},
124	{"Output Mixer", NULL, "Charge Pump 2"},
125	{"Output Mixer", NULL, "SHDN"},
126	{"DAC", NULL, "MCLK"},
127};
128
129static int max9850_hw_params(struct snd_pcm_substream *substream,
130			     struct snd_pcm_hw_params *params,
131			     struct snd_soc_dai *dai)
132{
133	struct snd_soc_codec *codec = dai->codec;
134	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
135	u64 lrclk_div;
136	u8 sf, da;
137
138	if (!max9850->sysclk)
139		return -EINVAL;
140
141	/* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
142	sf = (snd_soc_read(codec, MAX9850_CLOCK) >> 2) + 1;
143	lrclk_div = (1 << 22);
144	lrclk_div *= params_rate(params);
145	lrclk_div *= sf;
146	do_div(lrclk_div, max9850->sysclk);
147
148	snd_soc_write(codec, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
149	snd_soc_write(codec, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
150
151	switch (params_width(params)) {
152	case 16:
153		da = 0;
154		break;
155	case 20:
156		da = 0x2;
157		break;
158	case 24:
159		da = 0x3;
160		break;
161	default:
162		return -EINVAL;
163	}
164	snd_soc_update_bits(codec, MAX9850_DIGITAL_AUDIO, 0x3, da);
165
166	return 0;
167}
168
169static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
170		int clk_id, unsigned int freq, int dir)
171{
172	struct snd_soc_codec *codec = codec_dai->codec;
173	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
174
175	/* calculate mclk -> iclk divider */
176	if (freq <= 13000000)
177		snd_soc_write(codec, MAX9850_CLOCK, 0x0);
178	else if (freq <= 26000000)
179		snd_soc_write(codec, MAX9850_CLOCK, 0x4);
180	else if (freq <= 40000000)
181		snd_soc_write(codec, MAX9850_CLOCK, 0x8);
182	else
183		return -EINVAL;
184
185	max9850->sysclk = freq;
186	return 0;
187}
188
189static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
190{
191	struct snd_soc_codec *codec = codec_dai->codec;
192	u8 da = 0;
193
194	/* set master/slave audio interface */
195	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
196	case SND_SOC_DAIFMT_CBM_CFM:
197		da |= MAX9850_MASTER;
198		break;
199	case SND_SOC_DAIFMT_CBS_CFS:
200		break;
201	default:
202		return -EINVAL;
203	}
204
205	/* interface format */
206	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
207	case SND_SOC_DAIFMT_I2S:
208		da |= MAX9850_DLY;
209		break;
210	case SND_SOC_DAIFMT_RIGHT_J:
211		da |= MAX9850_RTJ;
212		break;
213	case SND_SOC_DAIFMT_LEFT_J:
214		break;
215	default:
216		return -EINVAL;
217	}
218
219	/* clock inversion */
220	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
221	case SND_SOC_DAIFMT_NB_NF:
222		break;
223	case SND_SOC_DAIFMT_IB_IF:
224		da |= MAX9850_BCINV | MAX9850_INV;
225		break;
226	case SND_SOC_DAIFMT_IB_NF:
227		da |= MAX9850_BCINV;
228		break;
229	case SND_SOC_DAIFMT_NB_IF:
230		da |= MAX9850_INV;
231		break;
232	default:
233		return -EINVAL;
234	}
235
236	/* set da */
237	snd_soc_write(codec, MAX9850_DIGITAL_AUDIO, da);
238
239	return 0;
240}
241
242static int max9850_set_bias_level(struct snd_soc_codec *codec,
243				  enum snd_soc_bias_level level)
244{
245	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
246	int ret;
247
248	switch (level) {
249	case SND_SOC_BIAS_ON:
250		break;
251	case SND_SOC_BIAS_PREPARE:
252		break;
253	case SND_SOC_BIAS_STANDBY:
254		if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) {
255			ret = regcache_sync(max9850->regmap);
256			if (ret) {
257				dev_err(codec->dev,
258					"Failed to sync cache: %d\n", ret);
259				return ret;
260			}
261		}
262		break;
263	case SND_SOC_BIAS_OFF:
264		break;
265	}
266	return 0;
267}
268
269#define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
270
271#define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
272	SNDRV_PCM_FMTBIT_S24_LE)
273
274static const struct snd_soc_dai_ops max9850_dai_ops = {
275	.hw_params	= max9850_hw_params,
276	.set_sysclk	= max9850_set_dai_sysclk,
277	.set_fmt	= max9850_set_dai_fmt,
278};
279
280static struct snd_soc_dai_driver max9850_dai = {
281	.name = "max9850-hifi",
282	.playback = {
283		.stream_name = "Playback",
284		.channels_min = 1,
285		.channels_max = 2,
286		.rates = MAX9850_RATES,
287		.formats = MAX9850_FORMATS
288	},
289	.ops = &max9850_dai_ops,
290};
291
292static int max9850_probe(struct snd_soc_codec *codec)
293{
294	/* enable zero-detect */
295	snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
296	/* enable slew-rate control */
297	snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
298	/* set slew-rate 125ms */
299	snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
300
301	return 0;
302}
303
304static struct snd_soc_codec_driver soc_codec_dev_max9850 = {
305	.probe =	max9850_probe,
306	.set_bias_level = max9850_set_bias_level,
307	.suspend_bias_off = true,
308
309	.controls = max9850_controls,
310	.num_controls = ARRAY_SIZE(max9850_controls),
311	.dapm_widgets = max9850_dapm_widgets,
312	.num_dapm_widgets = ARRAY_SIZE(max9850_dapm_widgets),
313	.dapm_routes = max9850_dapm_routes,
314	.num_dapm_routes = ARRAY_SIZE(max9850_dapm_routes),
315};
316
317static int max9850_i2c_probe(struct i2c_client *i2c,
318			     const struct i2c_device_id *id)
319{
320	struct max9850_priv *max9850;
321	int ret;
322
323	max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
324			       GFP_KERNEL);
325	if (max9850 == NULL)
326		return -ENOMEM;
327
328	max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap);
329	if (IS_ERR(max9850->regmap))
330		return PTR_ERR(max9850->regmap);
331
332	i2c_set_clientdata(i2c, max9850);
333
334	ret = snd_soc_register_codec(&i2c->dev,
335			&soc_codec_dev_max9850, &max9850_dai, 1);
336	return ret;
337}
338
339static int max9850_i2c_remove(struct i2c_client *client)
340{
341	snd_soc_unregister_codec(&client->dev);
342	return 0;
343}
344
345static const struct i2c_device_id max9850_i2c_id[] = {
346	{ "max9850", 0 },
347	{ }
348};
349MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
350
351static struct i2c_driver max9850_i2c_driver = {
352	.driver = {
353		.name = "max9850",
354	},
355	.probe = max9850_i2c_probe,
356	.remove = max9850_i2c_remove,
357	.id_table = max9850_i2c_id,
358};
359
360module_i2c_driver(max9850_i2c_driver);
361
362MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
363MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
364MODULE_LICENSE("GPL");
365