1/*
2 * PCM1681 ASoC codec driver
3 *
4 * Copyright (c) StreamUnlimited GmbH 2013
5 *	Marek Belisko <marek.belisko@streamunlimited.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/module.h>
19#include <linux/slab.h>
20#include <linux/delay.h>
21#include <linux/gpio.h>
22#include <linux/i2c.h>
23#include <linux/regmap.h>
24#include <linux/of.h>
25#include <linux/of_device.h>
26#include <linux/of_gpio.h>
27#include <sound/pcm.h>
28#include <sound/pcm_params.h>
29#include <sound/soc.h>
30#include <sound/tlv.h>
31
32#define PCM1681_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE  |		\
33			     SNDRV_PCM_FMTBIT_S24_LE)
34
35#define PCM1681_PCM_RATES   (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | \
36			     SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100  | \
37			     SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200  | \
38			     SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000)
39
40#define PCM1681_SOFT_MUTE_ALL		0xff
41#define PCM1681_DEEMPH_RATE_MASK	0x18
42#define PCM1681_DEEMPH_MASK		0x01
43
44#define PCM1681_ATT_CONTROL(X)	(X <= 6 ? X : X + 9) /* Attenuation level */
45#define PCM1681_SOFT_MUTE	0x07	/* Soft mute control register */
46#define PCM1681_DAC_CONTROL	0x08	/* DAC operation control */
47#define PCM1681_FMT_CONTROL	0x09	/* Audio interface data format */
48#define PCM1681_DEEMPH_CONTROL	0x0a	/* De-emphasis control */
49#define PCM1681_ZERO_DETECT_STATUS	0x0e	/* Zero detect status reg */
50
51static const struct reg_default pcm1681_reg_defaults[] = {
52	{ 0x01,	0xff },
53	{ 0x02,	0xff },
54	{ 0x03,	0xff },
55	{ 0x04,	0xff },
56	{ 0x05,	0xff },
57	{ 0x06,	0xff },
58	{ 0x07,	0x00 },
59	{ 0x08,	0x00 },
60	{ 0x09,	0x06 },
61	{ 0x0A,	0x00 },
62	{ 0x0B,	0xff },
63	{ 0x0C,	0x0f },
64	{ 0x0D,	0x00 },
65	{ 0x10,	0xff },
66	{ 0x11,	0xff },
67	{ 0x12,	0x00 },
68	{ 0x13,	0x00 },
69};
70
71static bool pcm1681_accessible_reg(struct device *dev, unsigned int reg)
72{
73	return !((reg == 0x00) || (reg == 0x0f));
74}
75
76static bool pcm1681_writeable_reg(struct device *dev, unsigned register reg)
77{
78	return pcm1681_accessible_reg(dev, reg) &&
79		(reg != PCM1681_ZERO_DETECT_STATUS);
80}
81
82struct pcm1681_private {
83	struct regmap *regmap;
84	unsigned int format;
85	/* Current deemphasis status */
86	unsigned int deemph;
87	/* Current rate for deemphasis control */
88	unsigned int rate;
89};
90
91static const int pcm1681_deemph[] = { 44100, 48000, 32000 };
92
93static int pcm1681_set_deemph(struct snd_soc_codec *codec)
94{
95	struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
96	int i = 0, val = -1, enable = 0;
97
98	if (priv->deemph) {
99		for (i = 0; i < ARRAY_SIZE(pcm1681_deemph); i++) {
100			if (pcm1681_deemph[i] == priv->rate) {
101				val = i;
102				break;
103			}
104		}
105	}
106
107	if (val != -1) {
108		regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
109				   PCM1681_DEEMPH_RATE_MASK, val << 3);
110		enable = 1;
111	} else {
112		enable = 0;
113	}
114
115	/* enable/disable deemphasis functionality */
116	return regmap_update_bits(priv->regmap, PCM1681_DEEMPH_CONTROL,
117					PCM1681_DEEMPH_MASK, enable);
118}
119
120static int pcm1681_get_deemph(struct snd_kcontrol *kcontrol,
121			      struct snd_ctl_elem_value *ucontrol)
122{
123	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
124	struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
125
126	ucontrol->value.integer.value[0] = priv->deemph;
127
128	return 0;
129}
130
131static int pcm1681_put_deemph(struct snd_kcontrol *kcontrol,
132			      struct snd_ctl_elem_value *ucontrol)
133{
134	struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
135	struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
136
137	priv->deemph = ucontrol->value.integer.value[0];
138
139	return pcm1681_set_deemph(codec);
140}
141
142static int pcm1681_set_dai_fmt(struct snd_soc_dai *codec_dai,
143			      unsigned int format)
144{
145	struct snd_soc_codec *codec = codec_dai->codec;
146	struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
147
148	/* The PCM1681 can only be slave to all clocks */
149	if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS) {
150		dev_err(codec->dev, "Invalid clocking mode\n");
151		return -EINVAL;
152	}
153
154	priv->format = format;
155
156	return 0;
157}
158
159static int pcm1681_digital_mute(struct snd_soc_dai *dai, int mute)
160{
161	struct snd_soc_codec *codec = dai->codec;
162	struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
163	int val;
164
165	if (mute)
166		val = PCM1681_SOFT_MUTE_ALL;
167	else
168		val = 0;
169
170	return regmap_write(priv->regmap, PCM1681_SOFT_MUTE, val);
171}
172
173static int pcm1681_hw_params(struct snd_pcm_substream *substream,
174			     struct snd_pcm_hw_params *params,
175			     struct snd_soc_dai *dai)
176{
177	struct snd_soc_codec *codec = dai->codec;
178	struct pcm1681_private *priv = snd_soc_codec_get_drvdata(codec);
179	int val = 0, ret;
180
181	priv->rate = params_rate(params);
182
183	switch (priv->format & SND_SOC_DAIFMT_FORMAT_MASK) {
184	case SND_SOC_DAIFMT_RIGHT_J:
185		switch (params_width(params)) {
186		case 24:
187			val = 0;
188			break;
189		case 16:
190			val = 3;
191			break;
192		default:
193			return -EINVAL;
194		}
195		break;
196	case SND_SOC_DAIFMT_I2S:
197		val = 0x04;
198		break;
199	case SND_SOC_DAIFMT_LEFT_J:
200		val = 0x05;
201		break;
202	default:
203		dev_err(codec->dev, "Invalid DAI format\n");
204		return -EINVAL;
205	}
206
207	ret = regmap_update_bits(priv->regmap, PCM1681_FMT_CONTROL, 0x0f, val);
208	if (ret < 0)
209		return ret;
210
211	return pcm1681_set_deemph(codec);
212}
213
214static const struct snd_soc_dai_ops pcm1681_dai_ops = {
215	.set_fmt	= pcm1681_set_dai_fmt,
216	.hw_params	= pcm1681_hw_params,
217	.digital_mute	= pcm1681_digital_mute,
218};
219
220static const struct snd_soc_dapm_widget pcm1681_dapm_widgets[] = {
221SND_SOC_DAPM_OUTPUT("VOUT1"),
222SND_SOC_DAPM_OUTPUT("VOUT2"),
223SND_SOC_DAPM_OUTPUT("VOUT3"),
224SND_SOC_DAPM_OUTPUT("VOUT4"),
225SND_SOC_DAPM_OUTPUT("VOUT5"),
226SND_SOC_DAPM_OUTPUT("VOUT6"),
227SND_SOC_DAPM_OUTPUT("VOUT7"),
228SND_SOC_DAPM_OUTPUT("VOUT8"),
229};
230
231static const struct snd_soc_dapm_route pcm1681_dapm_routes[] = {
232	{ "VOUT1", NULL, "Playback" },
233	{ "VOUT2", NULL, "Playback" },
234	{ "VOUT3", NULL, "Playback" },
235	{ "VOUT4", NULL, "Playback" },
236	{ "VOUT5", NULL, "Playback" },
237	{ "VOUT6", NULL, "Playback" },
238	{ "VOUT7", NULL, "Playback" },
239	{ "VOUT8", NULL, "Playback" },
240};
241
242static const DECLARE_TLV_DB_SCALE(pcm1681_dac_tlv, -6350, 50, 1);
243
244static const struct snd_kcontrol_new pcm1681_controls[] = {
245	SOC_DOUBLE_R_TLV("Channel 1/2 Playback Volume",
246			PCM1681_ATT_CONTROL(1), PCM1681_ATT_CONTROL(2), 0,
247			0x7f, 0, pcm1681_dac_tlv),
248	SOC_DOUBLE_R_TLV("Channel 3/4 Playback Volume",
249			PCM1681_ATT_CONTROL(3), PCM1681_ATT_CONTROL(4), 0,
250			0x7f, 0, pcm1681_dac_tlv),
251	SOC_DOUBLE_R_TLV("Channel 5/6 Playback Volume",
252			PCM1681_ATT_CONTROL(5), PCM1681_ATT_CONTROL(6), 0,
253			0x7f, 0, pcm1681_dac_tlv),
254	SOC_DOUBLE_R_TLV("Channel 7/8 Playback Volume",
255			PCM1681_ATT_CONTROL(7), PCM1681_ATT_CONTROL(8), 0,
256			0x7f, 0, pcm1681_dac_tlv),
257	SOC_SINGLE_BOOL_EXT("De-emphasis Switch", 0,
258			    pcm1681_get_deemph, pcm1681_put_deemph),
259};
260
261static struct snd_soc_dai_driver pcm1681_dai = {
262	.name = "pcm1681-hifi",
263	.playback = {
264		.stream_name = "Playback",
265		.channels_min = 2,
266		.channels_max = 8,
267		.rates = PCM1681_PCM_RATES,
268		.formats = PCM1681_PCM_FORMATS,
269	},
270	.ops = &pcm1681_dai_ops,
271};
272
273#ifdef CONFIG_OF
274static const struct of_device_id pcm1681_dt_ids[] = {
275	{ .compatible = "ti,pcm1681", },
276	{ }
277};
278MODULE_DEVICE_TABLE(of, pcm1681_dt_ids);
279#endif
280
281static const struct regmap_config pcm1681_regmap = {
282	.reg_bits		= 8,
283	.val_bits		= 8,
284	.max_register		= 0x13,
285	.reg_defaults		= pcm1681_reg_defaults,
286	.num_reg_defaults	= ARRAY_SIZE(pcm1681_reg_defaults),
287	.writeable_reg		= pcm1681_writeable_reg,
288	.readable_reg		= pcm1681_accessible_reg,
289};
290
291static struct snd_soc_codec_driver soc_codec_dev_pcm1681 = {
292	.controls		= pcm1681_controls,
293	.num_controls		= ARRAY_SIZE(pcm1681_controls),
294	.dapm_widgets		= pcm1681_dapm_widgets,
295	.num_dapm_widgets	= ARRAY_SIZE(pcm1681_dapm_widgets),
296	.dapm_routes		= pcm1681_dapm_routes,
297	.num_dapm_routes	= ARRAY_SIZE(pcm1681_dapm_routes),
298};
299
300static const struct i2c_device_id pcm1681_i2c_id[] = {
301	{"pcm1681", 0},
302	{}
303};
304MODULE_DEVICE_TABLE(i2c, pcm1681_i2c_id);
305
306static int pcm1681_i2c_probe(struct i2c_client *client,
307			      const struct i2c_device_id *id)
308{
309	int ret;
310	struct pcm1681_private *priv;
311
312	priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
313	if (!priv)
314		return -ENOMEM;
315
316	priv->regmap = devm_regmap_init_i2c(client, &pcm1681_regmap);
317	if (IS_ERR(priv->regmap)) {
318		ret = PTR_ERR(priv->regmap);
319		dev_err(&client->dev, "Failed to create regmap: %d\n", ret);
320		return ret;
321	}
322
323	i2c_set_clientdata(client, priv);
324
325	return snd_soc_register_codec(&client->dev, &soc_codec_dev_pcm1681,
326		&pcm1681_dai, 1);
327}
328
329static int pcm1681_i2c_remove(struct i2c_client *client)
330{
331	snd_soc_unregister_codec(&client->dev);
332	return 0;
333}
334
335static struct i2c_driver pcm1681_i2c_driver = {
336	.driver = {
337		.name	= "pcm1681",
338		.of_match_table = of_match_ptr(pcm1681_dt_ids),
339	},
340	.id_table	= pcm1681_i2c_id,
341	.probe		= pcm1681_i2c_probe,
342	.remove		= pcm1681_i2c_remove,
343};
344
345module_i2c_driver(pcm1681_i2c_driver);
346
347MODULE_DESCRIPTION("Texas Instruments PCM1681 ALSA SoC Codec Driver");
348MODULE_AUTHOR("Marek Belisko <marek.belisko@streamunlimited.com>");
349MODULE_LICENSE("GPL");
350