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 unsigned int max9850_tlv[] = {
71	TLV_DB_RANGE_HEAD(4),
72	0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
73	0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
74	0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
75	0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0),
76};
77
78static const struct snd_kcontrol_new max9850_controls[] = {
79SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
80SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
81SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
82};
83
84static const struct snd_kcontrol_new max9850_mixer_controls[] = {
85	SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
86};
87
88static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
89SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
90SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
91SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
92SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
93SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
94		&max9850_mixer_controls[0],
95		ARRAY_SIZE(max9850_mixer_controls)),
96SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
97SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
98SND_SOC_DAPM_OUTPUT("OUTL"),
99SND_SOC_DAPM_OUTPUT("HPL"),
100SND_SOC_DAPM_OUTPUT("OUTR"),
101SND_SOC_DAPM_OUTPUT("HPR"),
102SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
103SND_SOC_DAPM_INPUT("INL"),
104SND_SOC_DAPM_INPUT("INR"),
105};
106
107static const struct snd_soc_dapm_route max9850_dapm_routes[] = {
108	/* output mixer */
109	{"Output Mixer", NULL, "DAC"},
110	{"Output Mixer", "Line In Switch", "Line Input"},
111
112	/* outputs */
113	{"Headphone Output", NULL, "Output Mixer"},
114	{"HPL", NULL, "Headphone Output"},
115	{"HPR", NULL, "Headphone Output"},
116	{"OUTL", NULL, "Output Mixer"},
117	{"OUTR", NULL, "Output Mixer"},
118
119	/* inputs */
120	{"Line Input", NULL, "INL"},
121	{"Line Input", NULL, "INR"},
122
123	/* supplies */
124	{"Output Mixer", NULL, "Charge Pump 1"},
125	{"Output Mixer", NULL, "Charge Pump 2"},
126	{"Output Mixer", NULL, "SHDN"},
127	{"DAC", NULL, "MCLK"},
128};
129
130static int max9850_hw_params(struct snd_pcm_substream *substream,
131			     struct snd_pcm_hw_params *params,
132			     struct snd_soc_dai *dai)
133{
134	struct snd_soc_codec *codec = dai->codec;
135	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
136	u64 lrclk_div;
137	u8 sf, da;
138
139	if (!max9850->sysclk)
140		return -EINVAL;
141
142	/* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
143	sf = (snd_soc_read(codec, MAX9850_CLOCK) >> 2) + 1;
144	lrclk_div = (1 << 22);
145	lrclk_div *= params_rate(params);
146	lrclk_div *= sf;
147	do_div(lrclk_div, max9850->sysclk);
148
149	snd_soc_write(codec, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
150	snd_soc_write(codec, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
151
152	switch (params_width(params)) {
153	case 16:
154		da = 0;
155		break;
156	case 20:
157		da = 0x2;
158		break;
159	case 24:
160		da = 0x3;
161		break;
162	default:
163		return -EINVAL;
164	}
165	snd_soc_update_bits(codec, MAX9850_DIGITAL_AUDIO, 0x3, da);
166
167	return 0;
168}
169
170static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
171		int clk_id, unsigned int freq, int dir)
172{
173	struct snd_soc_codec *codec = codec_dai->codec;
174	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
175
176	/* calculate mclk -> iclk divider */
177	if (freq <= 13000000)
178		snd_soc_write(codec, MAX9850_CLOCK, 0x0);
179	else if (freq <= 26000000)
180		snd_soc_write(codec, MAX9850_CLOCK, 0x4);
181	else if (freq <= 40000000)
182		snd_soc_write(codec, MAX9850_CLOCK, 0x8);
183	else
184		return -EINVAL;
185
186	max9850->sysclk = freq;
187	return 0;
188}
189
190static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
191{
192	struct snd_soc_codec *codec = codec_dai->codec;
193	u8 da = 0;
194
195	/* set master/slave audio interface */
196	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
197	case SND_SOC_DAIFMT_CBM_CFM:
198		da |= MAX9850_MASTER;
199		break;
200	case SND_SOC_DAIFMT_CBS_CFS:
201		break;
202	default:
203		return -EINVAL;
204	}
205
206	/* interface format */
207	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
208	case SND_SOC_DAIFMT_I2S:
209		da |= MAX9850_DLY;
210		break;
211	case SND_SOC_DAIFMT_RIGHT_J:
212		da |= MAX9850_RTJ;
213		break;
214	case SND_SOC_DAIFMT_LEFT_J:
215		break;
216	default:
217		return -EINVAL;
218	}
219
220	/* clock inversion */
221	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
222	case SND_SOC_DAIFMT_NB_NF:
223		break;
224	case SND_SOC_DAIFMT_IB_IF:
225		da |= MAX9850_BCINV | MAX9850_INV;
226		break;
227	case SND_SOC_DAIFMT_IB_NF:
228		da |= MAX9850_BCINV;
229		break;
230	case SND_SOC_DAIFMT_NB_IF:
231		da |= MAX9850_INV;
232		break;
233	default:
234		return -EINVAL;
235	}
236
237	/* set da */
238	snd_soc_write(codec, MAX9850_DIGITAL_AUDIO, da);
239
240	return 0;
241}
242
243static int max9850_set_bias_level(struct snd_soc_codec *codec,
244				  enum snd_soc_bias_level level)
245{
246	struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
247	int ret;
248
249	switch (level) {
250	case SND_SOC_BIAS_ON:
251		break;
252	case SND_SOC_BIAS_PREPARE:
253		break;
254	case SND_SOC_BIAS_STANDBY:
255		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
256			ret = regcache_sync(max9850->regmap);
257			if (ret) {
258				dev_err(codec->dev,
259					"Failed to sync cache: %d\n", ret);
260				return ret;
261			}
262		}
263		break;
264	case SND_SOC_BIAS_OFF:
265		break;
266	}
267	codec->dapm.bias_level = level;
268	return 0;
269}
270
271#define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
272
273#define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
274	SNDRV_PCM_FMTBIT_S24_LE)
275
276static const struct snd_soc_dai_ops max9850_dai_ops = {
277	.hw_params	= max9850_hw_params,
278	.set_sysclk	= max9850_set_dai_sysclk,
279	.set_fmt	= max9850_set_dai_fmt,
280};
281
282static struct snd_soc_dai_driver max9850_dai = {
283	.name = "max9850-hifi",
284	.playback = {
285		.stream_name = "Playback",
286		.channels_min = 1,
287		.channels_max = 2,
288		.rates = MAX9850_RATES,
289		.formats = MAX9850_FORMATS
290	},
291	.ops = &max9850_dai_ops,
292};
293
294static int max9850_probe(struct snd_soc_codec *codec)
295{
296	/* enable zero-detect */
297	snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
298	/* enable slew-rate control */
299	snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
300	/* set slew-rate 125ms */
301	snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
302
303	return 0;
304}
305
306static struct snd_soc_codec_driver soc_codec_dev_max9850 = {
307	.probe =	max9850_probe,
308	.set_bias_level = max9850_set_bias_level,
309	.suspend_bias_off = true,
310
311	.controls = max9850_controls,
312	.num_controls = ARRAY_SIZE(max9850_controls),
313	.dapm_widgets = max9850_dapm_widgets,
314	.num_dapm_widgets = ARRAY_SIZE(max9850_dapm_widgets),
315	.dapm_routes = max9850_dapm_routes,
316	.num_dapm_routes = ARRAY_SIZE(max9850_dapm_routes),
317};
318
319static int max9850_i2c_probe(struct i2c_client *i2c,
320			     const struct i2c_device_id *id)
321{
322	struct max9850_priv *max9850;
323	int ret;
324
325	max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv),
326			       GFP_KERNEL);
327	if (max9850 == NULL)
328		return -ENOMEM;
329
330	max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap);
331	if (IS_ERR(max9850->regmap))
332		return PTR_ERR(max9850->regmap);
333
334	i2c_set_clientdata(i2c, max9850);
335
336	ret = snd_soc_register_codec(&i2c->dev,
337			&soc_codec_dev_max9850, &max9850_dai, 1);
338	return ret;
339}
340
341static int max9850_i2c_remove(struct i2c_client *client)
342{
343	snd_soc_unregister_codec(&client->dev);
344	return 0;
345}
346
347static const struct i2c_device_id max9850_i2c_id[] = {
348	{ "max9850", 0 },
349	{ }
350};
351MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
352
353static struct i2c_driver max9850_i2c_driver = {
354	.driver = {
355		.name = "max9850",
356		.owner = THIS_MODULE,
357	},
358	.probe = max9850_i2c_probe,
359	.remove = max9850_i2c_remove,
360	.id_table = max9850_i2c_id,
361};
362
363module_i2c_driver(max9850_i2c_driver);
364
365MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
366MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
367MODULE_LICENSE("GPL");
368