1/*
2 * sound/soc/codecs/si476x.c -- Codec driver for SI476X chips
3 *
4 * Copyright (C) 2012 Innovative Converged Devices(ICD)
5 * Copyright (C) 2013 Andrey Smirnov
6 *
7 * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 */
19
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <sound/pcm.h>
23#include <sound/pcm_params.h>
24#include <linux/regmap.h>
25#include <sound/soc.h>
26#include <sound/initval.h>
27
28#include <linux/i2c.h>
29
30#include <linux/mfd/si476x-core.h>
31
32enum si476x_audio_registers {
33	SI476X_DIGITAL_IO_OUTPUT_FORMAT		= 0x0203,
34	SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE	= 0x0202,
35};
36
37enum si476x_digital_io_output_format {
38	SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT	= 11,
39	SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT	= 8,
40};
41
42#define SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK	((0x7 << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) | \
43						  (0x7 << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT))
44#define SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK	(0x7e)
45
46enum si476x_daudio_formats {
47	SI476X_DAUDIO_MODE_I2S		= (0x0 << 1),
48	SI476X_DAUDIO_MODE_DSP_A	= (0x6 << 1),
49	SI476X_DAUDIO_MODE_DSP_B	= (0x7 << 1),
50	SI476X_DAUDIO_MODE_LEFT_J	= (0x8 << 1),
51	SI476X_DAUDIO_MODE_RIGHT_J	= (0x9 << 1),
52
53	SI476X_DAUDIO_MODE_IB		= (1 << 5),
54	SI476X_DAUDIO_MODE_IF		= (1 << 6),
55};
56
57enum si476x_pcm_format {
58	SI476X_PCM_FORMAT_S8		= 2,
59	SI476X_PCM_FORMAT_S16_LE	= 4,
60	SI476X_PCM_FORMAT_S20_3LE	= 5,
61	SI476X_PCM_FORMAT_S24_LE	= 6,
62};
63
64static const struct snd_soc_dapm_widget si476x_dapm_widgets[] = {
65SND_SOC_DAPM_OUTPUT("LOUT"),
66SND_SOC_DAPM_OUTPUT("ROUT"),
67};
68
69static const struct snd_soc_dapm_route si476x_dapm_routes[] = {
70	{ "Capture", NULL, "LOUT" },
71	{ "Capture", NULL, "ROUT" },
72};
73
74static int si476x_codec_set_dai_fmt(struct snd_soc_dai *codec_dai,
75				    unsigned int fmt)
76{
77	struct si476x_core *core = i2c_mfd_cell_to_core(codec_dai->dev);
78	int err;
79	u16 format = 0;
80
81	if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
82		return -EINVAL;
83
84	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
85	case SND_SOC_DAIFMT_DSP_A:
86		format |= SI476X_DAUDIO_MODE_DSP_A;
87		break;
88	case SND_SOC_DAIFMT_DSP_B:
89		format |= SI476X_DAUDIO_MODE_DSP_B;
90		break;
91	case SND_SOC_DAIFMT_I2S:
92		format |= SI476X_DAUDIO_MODE_I2S;
93		break;
94	case SND_SOC_DAIFMT_RIGHT_J:
95		format |= SI476X_DAUDIO_MODE_RIGHT_J;
96		break;
97	case SND_SOC_DAIFMT_LEFT_J:
98		format |= SI476X_DAUDIO_MODE_LEFT_J;
99		break;
100	default:
101		return -EINVAL;
102	}
103
104	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
105	case SND_SOC_DAIFMT_DSP_A:
106	case SND_SOC_DAIFMT_DSP_B:
107		switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
108		case SND_SOC_DAIFMT_NB_NF:
109			break;
110		case SND_SOC_DAIFMT_IB_NF:
111			format |= SI476X_DAUDIO_MODE_IB;
112			break;
113		default:
114			return -EINVAL;
115		}
116		break;
117	case SND_SOC_DAIFMT_I2S:
118	case SND_SOC_DAIFMT_RIGHT_J:
119	case SND_SOC_DAIFMT_LEFT_J:
120		switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
121		case SND_SOC_DAIFMT_NB_NF:
122			break;
123		case SND_SOC_DAIFMT_IB_IF:
124			format |= SI476X_DAUDIO_MODE_IB |
125				SI476X_DAUDIO_MODE_IF;
126			break;
127		case SND_SOC_DAIFMT_IB_NF:
128			format |= SI476X_DAUDIO_MODE_IB;
129			break;
130		case SND_SOC_DAIFMT_NB_IF:
131			format |= SI476X_DAUDIO_MODE_IF;
132			break;
133		default:
134			return -EINVAL;
135		}
136		break;
137	default:
138		return -EINVAL;
139	}
140
141	si476x_core_lock(core);
142
143	err = snd_soc_update_bits(codec_dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
144				  SI476X_DIGITAL_IO_OUTPUT_FORMAT_MASK,
145				  format);
146
147	si476x_core_unlock(core);
148
149	if (err < 0) {
150		dev_err(codec_dai->codec->dev, "Failed to set output format\n");
151		return err;
152	}
153
154	return 0;
155}
156
157static int si476x_codec_hw_params(struct snd_pcm_substream *substream,
158				  struct snd_pcm_hw_params *params,
159				  struct snd_soc_dai *dai)
160{
161	struct si476x_core *core = i2c_mfd_cell_to_core(dai->dev);
162	int rate, width, err;
163
164	rate = params_rate(params);
165	if (rate < 32000 || rate > 48000) {
166		dev_err(dai->codec->dev, "Rate: %d is not supported\n", rate);
167		return -EINVAL;
168	}
169
170	switch (params_width(params)) {
171	case 8:
172		width = SI476X_PCM_FORMAT_S8;
173		break;
174	case 16:
175		width = SI476X_PCM_FORMAT_S16_LE;
176		break;
177	case 20:
178		width = SI476X_PCM_FORMAT_S20_3LE;
179		break;
180	case 24:
181		width = SI476X_PCM_FORMAT_S24_LE;
182		break;
183	default:
184		return -EINVAL;
185	}
186
187	si476x_core_lock(core);
188
189	err = snd_soc_write(dai->codec, SI476X_DIGITAL_IO_OUTPUT_SAMPLE_RATE,
190			    rate);
191	if (err < 0) {
192		dev_err(dai->codec->dev, "Failed to set sample rate\n");
193		goto out;
194	}
195
196	err = snd_soc_update_bits(dai->codec, SI476X_DIGITAL_IO_OUTPUT_FORMAT,
197				  SI476X_DIGITAL_IO_OUTPUT_WIDTH_MASK,
198				  (width << SI476X_DIGITAL_IO_SLOT_SIZE_SHIFT) |
199				  (width << SI476X_DIGITAL_IO_SAMPLE_SIZE_SHIFT));
200	if (err < 0) {
201		dev_err(dai->codec->dev, "Failed to set output width\n");
202		goto out;
203	}
204
205out:
206	si476x_core_unlock(core);
207
208	return err;
209}
210
211static struct snd_soc_dai_ops si476x_dai_ops = {
212	.hw_params	= si476x_codec_hw_params,
213	.set_fmt	= si476x_codec_set_dai_fmt,
214};
215
216static struct snd_soc_dai_driver si476x_dai = {
217	.name		= "si476x-codec",
218	.capture	= {
219		.stream_name	= "Capture",
220		.channels_min	= 2,
221		.channels_max	= 2,
222
223		.rates = SNDRV_PCM_RATE_32000 |
224		SNDRV_PCM_RATE_44100 |
225		SNDRV_PCM_RATE_48000,
226		.formats = SNDRV_PCM_FMTBIT_S8 |
227		SNDRV_PCM_FMTBIT_S16_LE |
228		SNDRV_PCM_FMTBIT_S20_3LE |
229		SNDRV_PCM_FMTBIT_S24_LE
230	},
231	.ops		= &si476x_dai_ops,
232};
233
234static struct regmap *si476x_get_regmap(struct device *dev)
235{
236	return dev_get_regmap(dev->parent, NULL);
237}
238
239static struct snd_soc_codec_driver soc_codec_dev_si476x = {
240	.get_regmap = si476x_get_regmap,
241	.dapm_widgets = si476x_dapm_widgets,
242	.num_dapm_widgets = ARRAY_SIZE(si476x_dapm_widgets),
243	.dapm_routes = si476x_dapm_routes,
244	.num_dapm_routes = ARRAY_SIZE(si476x_dapm_routes),
245};
246
247static int si476x_platform_probe(struct platform_device *pdev)
248{
249	return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_si476x,
250				      &si476x_dai, 1);
251}
252
253static int si476x_platform_remove(struct platform_device *pdev)
254{
255	snd_soc_unregister_codec(&pdev->dev);
256	return 0;
257}
258
259MODULE_ALIAS("platform:si476x-codec");
260
261static struct platform_driver si476x_platform_driver = {
262	.driver		= {
263		.name	= "si476x-codec",
264	},
265	.probe		= si476x_platform_probe,
266	.remove		= si476x_platform_remove,
267};
268module_platform_driver(si476x_platform_driver);
269
270MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
271MODULE_DESCRIPTION("ASoC Si4761/64 codec driver");
272MODULE_LICENSE("GPL");
273