1/*
2 * Texas Instruments TLV320AIC26 low power audio CODEC
3 * ALSA SoC CODEC driver
4 *
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
6 */
7
8#include <linux/module.h>
9#include <linux/moduleparam.h>
10#include <linux/init.h>
11#include <linux/delay.h>
12#include <linux/pm.h>
13#include <linux/device.h>
14#include <linux/sysfs.h>
15#include <linux/spi/spi.h>
16#include <linux/slab.h>
17#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/pcm_params.h>
20#include <sound/soc.h>
21#include <sound/initval.h>
22
23#include "tlv320aic26.h"
24
25MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver");
26MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
27MODULE_LICENSE("GPL");
28
29/* AIC26 driver private data */
30struct aic26 {
31	struct spi_device *spi;
32	struct regmap *regmap;
33	struct snd_soc_codec *codec;
34	int master;
35	int datfm;
36	int mclk;
37
38	/* Keyclick parameters */
39	int keyclick_amplitude;
40	int keyclick_freq;
41	int keyclick_len;
42};
43
44static const struct snd_soc_dapm_widget tlv320aic26_dapm_widgets[] = {
45SND_SOC_DAPM_INPUT("MICIN"),
46SND_SOC_DAPM_INPUT("AUX"),
47
48SND_SOC_DAPM_OUTPUT("HPL"),
49SND_SOC_DAPM_OUTPUT("HPR"),
50};
51
52static const struct snd_soc_dapm_route tlv320aic26_dapm_routes[] = {
53	{ "Capture", NULL, "MICIN" },
54	{ "Capture", NULL, "AUX" },
55
56	{ "HPL", NULL, "Playback" },
57	{ "HPR", NULL, "Playback" },
58};
59
60/* ---------------------------------------------------------------------
61 * Digital Audio Interface Operations
62 */
63static int aic26_hw_params(struct snd_pcm_substream *substream,
64			   struct snd_pcm_hw_params *params,
65			   struct snd_soc_dai *dai)
66{
67	struct snd_soc_codec *codec = dai->codec;
68	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
69	int fsref, divisor, wlen, pval, jval, dval, qval;
70	u16 reg;
71
72	dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
73		substream, params);
74	dev_dbg(&aic26->spi->dev, "rate=%i width=%d\n", params_rate(params),
75		params_width(params));
76
77	switch (params_rate(params)) {
78	case 8000:  fsref = 48000; divisor = AIC26_DIV_6; break;
79	case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
80	case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
81	case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
82	case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
83	case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
84	case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
85	case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
86	case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
87	default:
88		dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
89	}
90
91	/* select data word length */
92	switch (params_width(params)) {
93	case 8:  wlen = AIC26_WLEN_16; break;
94	case 16: wlen = AIC26_WLEN_16; break;
95	case 24: wlen = AIC26_WLEN_24; break;
96	case 32: wlen = AIC26_WLEN_32; break;
97	default:
98		dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
99	}
100
101	/**
102	 * Configure PLL
103	 * fsref = (mclk * PLLM) / 2048
104	 * where PLLM = J.DDDD (DDDD register ranges from 0 to 9999, decimal)
105	 */
106	pval = 1;
107	/* compute J portion of multiplier */
108	jval = fsref / (aic26->mclk / 2048);
109	/* compute fractional DDDD component of multiplier */
110	dval = fsref - (jval * (aic26->mclk / 2048));
111	dval = (10000 * dval) / (aic26->mclk / 2048);
112	dev_dbg(&aic26->spi->dev, "Setting PLLM to %d.%04d\n", jval, dval);
113	qval = 0;
114	reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
115	snd_soc_write(codec, AIC26_REG_PLL_PROG1, reg);
116	reg = dval << 2;
117	snd_soc_write(codec, AIC26_REG_PLL_PROG2, reg);
118
119	/* Audio Control 3 (master mode, fsref rate) */
120	if (aic26->master)
121		reg = 0x0800;
122	if (fsref == 48000)
123		reg = 0x2000;
124	snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL3, 0xf800, reg);
125
126	/* Audio Control 1 (FSref divisor) */
127	reg = wlen | aic26->datfm | (divisor << 3) | divisor;
128	snd_soc_update_bits(codec, AIC26_REG_AUDIO_CTRL1, 0xfff, reg);
129
130	return 0;
131}
132
133/**
134 * aic26_mute - Mute control to reduce noise when changing audio format
135 */
136static int aic26_mute(struct snd_soc_dai *dai, int mute)
137{
138	struct snd_soc_codec *codec = dai->codec;
139	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
140	u16 reg;
141
142	dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
143		dai, mute);
144
145	if (mute)
146		reg = 0x8080;
147	else
148		reg = 0;
149	snd_soc_update_bits(codec, AIC26_REG_DAC_GAIN, 0x8000, reg);
150
151	return 0;
152}
153
154static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
155			    int clk_id, unsigned int freq, int dir)
156{
157	struct snd_soc_codec *codec = codec_dai->codec;
158	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
159
160	dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
161		" freq=%i, dir=%i)\n",
162		codec_dai, clk_id, freq, dir);
163
164	/* MCLK needs to fall between 2MHz and 50 MHz */
165	if ((freq < 2000000) || (freq > 50000000))
166		return -EINVAL;
167
168	aic26->mclk = freq;
169	return 0;
170}
171
172static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
173{
174	struct snd_soc_codec *codec = codec_dai->codec;
175	struct aic26 *aic26 = snd_soc_codec_get_drvdata(codec);
176
177	dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
178		codec_dai, fmt);
179
180	/* set master/slave audio interface */
181	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
182	case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
183	case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
184	default:
185		dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
186	}
187
188	/* interface format */
189	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
190	case SND_SOC_DAIFMT_I2S:     aic26->datfm = AIC26_DATFM_I2S; break;
191	case SND_SOC_DAIFMT_DSP_A:   aic26->datfm = AIC26_DATFM_DSP; break;
192	case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
193	case SND_SOC_DAIFMT_LEFT_J:  aic26->datfm = AIC26_DATFM_LEFTJ; break;
194	default:
195		dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
196	}
197
198	return 0;
199}
200
201/* ---------------------------------------------------------------------
202 * Digital Audio Interface Definition
203 */
204#define AIC26_RATES	(SNDRV_PCM_RATE_8000  | SNDRV_PCM_RATE_11025 |\
205			 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
206			 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
207			 SNDRV_PCM_RATE_48000)
208#define AIC26_FORMATS	(SNDRV_PCM_FMTBIT_S8     | SNDRV_PCM_FMTBIT_S16_BE |\
209			 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
210
211static const struct snd_soc_dai_ops aic26_dai_ops = {
212	.hw_params	= aic26_hw_params,
213	.digital_mute	= aic26_mute,
214	.set_sysclk	= aic26_set_sysclk,
215	.set_fmt	= aic26_set_fmt,
216};
217
218static struct snd_soc_dai_driver aic26_dai = {
219	.name = "tlv320aic26-hifi",
220	.playback = {
221		.stream_name = "Playback",
222		.channels_min = 2,
223		.channels_max = 2,
224		.rates = AIC26_RATES,
225		.formats = AIC26_FORMATS,
226	},
227	.capture = {
228		.stream_name = "Capture",
229		.channels_min = 2,
230		.channels_max = 2,
231		.rates = AIC26_RATES,
232		.formats = AIC26_FORMATS,
233	},
234	.ops = &aic26_dai_ops,
235};
236
237/* ---------------------------------------------------------------------
238 * ALSA controls
239 */
240static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
241static SOC_ENUM_SINGLE_DECL(aic26_capture_src_enum,
242			    AIC26_REG_AUDIO_CTRL1, 12,
243			    aic26_capture_src_text);
244
245static const struct snd_kcontrol_new aic26_snd_controls[] = {
246	/* Output */
247	SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
248	SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
249	SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
250	SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
251	SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
252	SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
253	SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
254	SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
255	SOC_ENUM("Capture Source", aic26_capture_src_enum),
256};
257
258/* ---------------------------------------------------------------------
259 * SPI device portion of driver: sysfs files for debugging
260 */
261
262static ssize_t aic26_keyclick_show(struct device *dev,
263				   struct device_attribute *attr, char *buf)
264{
265	struct aic26 *aic26 = dev_get_drvdata(dev);
266	int val, amp, freq, len;
267
268	val = snd_soc_read(aic26->codec, AIC26_REG_AUDIO_CTRL2);
269	amp = (val >> 12) & 0x7;
270	freq = (125 << ((val >> 8) & 0x7)) >> 1;
271	len = 2 * (1 + ((val >> 4) & 0xf));
272
273	return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
274}
275
276/* Any write to the keyclick attribute will trigger the keyclick event */
277static ssize_t aic26_keyclick_set(struct device *dev,
278				  struct device_attribute *attr,
279				  const char *buf, size_t count)
280{
281	struct aic26 *aic26 = dev_get_drvdata(dev);
282
283	snd_soc_update_bits(aic26->codec, AIC26_REG_AUDIO_CTRL2,
284			    0x8000, 0x800);
285
286	return count;
287}
288
289static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);
290
291/* ---------------------------------------------------------------------
292 * SoC CODEC portion of driver: probe and release routines
293 */
294static int aic26_probe(struct snd_soc_codec *codec)
295{
296	struct aic26 *aic26 = dev_get_drvdata(codec->dev);
297	int ret, reg;
298
299	aic26->codec = codec;
300
301	/* Reset the codec to power on defaults */
302	snd_soc_write(codec, AIC26_REG_RESET, 0xBB00);
303
304	/* Power up CODEC */
305	snd_soc_write(codec, AIC26_REG_POWER_CTRL, 0);
306
307	/* Audio Control 3 (master mode, fsref rate) */
308	reg = snd_soc_read(codec, AIC26_REG_AUDIO_CTRL3);
309	reg &= ~0xf800;
310	reg |= 0x0800; /* set master mode */
311	snd_soc_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
312
313	/* Register the sysfs files for debugging */
314	/* Create SysFS files */
315	ret = device_create_file(codec->dev, &dev_attr_keyclick);
316	if (ret)
317		dev_info(codec->dev, "error creating sysfs files\n");
318
319	return 0;
320}
321
322static struct snd_soc_codec_driver aic26_soc_codec_dev = {
323	.probe = aic26_probe,
324	.controls = aic26_snd_controls,
325	.num_controls = ARRAY_SIZE(aic26_snd_controls),
326	.dapm_widgets = tlv320aic26_dapm_widgets,
327	.num_dapm_widgets = ARRAY_SIZE(tlv320aic26_dapm_widgets),
328	.dapm_routes = tlv320aic26_dapm_routes,
329	.num_dapm_routes = ARRAY_SIZE(tlv320aic26_dapm_routes),
330};
331
332static const struct regmap_config aic26_regmap = {
333	.reg_bits = 16,
334	.val_bits = 16,
335};
336
337/* ---------------------------------------------------------------------
338 * SPI device portion of driver: probe and release routines and SPI
339 * 				 driver registration.
340 */
341static int aic26_spi_probe(struct spi_device *spi)
342{
343	struct aic26 *aic26;
344	int ret;
345
346	dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");
347
348	/* Allocate driver data */
349	aic26 = devm_kzalloc(&spi->dev, sizeof *aic26, GFP_KERNEL);
350	if (!aic26)
351		return -ENOMEM;
352
353	aic26->regmap = devm_regmap_init_spi(spi, &aic26_regmap);
354	if (IS_ERR(aic26->regmap))
355		return PTR_ERR(aic26->regmap);
356
357	/* Initialize the driver data */
358	aic26->spi = spi;
359	dev_set_drvdata(&spi->dev, aic26);
360	aic26->master = 1;
361
362	ret = snd_soc_register_codec(&spi->dev,
363			&aic26_soc_codec_dev, &aic26_dai, 1);
364	return ret;
365}
366
367static int aic26_spi_remove(struct spi_device *spi)
368{
369	snd_soc_unregister_codec(&spi->dev);
370	return 0;
371}
372
373static struct spi_driver aic26_spi = {
374	.driver = {
375		.name = "tlv320aic26-codec",
376		.owner = THIS_MODULE,
377	},
378	.probe = aic26_spi_probe,
379	.remove = aic26_spi_remove,
380};
381
382module_spi_driver(aic26_spi);
383