2 * Texas Instruments TLV320AIC26 low power audio CODEC
3 * ALSA SoC CODEC driver
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
8 #include <linux/module.h>
9 #include <linux/moduleparam.h>
10 #include <linux/init.h>
11 #include <linux/delay.h>
13 #include <linux/device.h>
14 #include <linux/sysfs.h>
15 #include <linux/spi/spi.h>
16 #include <sound/core.h>
17 #include <sound/pcm.h>
18 #include <sound/pcm_params.h>
19 #include <sound/soc.h>
20 #include <sound/soc-dapm.h>
21 #include <sound/soc-of-simple.h>
22 #include <sound/initval.h>
24 #include "tlv320aic26.h"
26 MODULE_DESCRIPTION("ASoC TLV320AIC26 codec driver");
27 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
28 MODULE_LICENSE("GPL");
30 /* AIC26 driver private data */
32 struct spi_device *spi;
33 struct snd_soc_codec codec;
34 u16 reg_cache[AIC26_NUM_REGS]; /* shadow registers */
39 /* Keyclick parameters */
40 int keyclick_amplitude;
45 /* ---------------------------------------------------------------------
46 * Register access routines
48 static unsigned int aic26_reg_read(struct snd_soc_codec *codec,
51 struct aic26 *aic26 = codec->private_data;
52 u16 *cache = codec->reg_cache;
57 if (reg >= AIC26_NUM_REGS) {
62 /* Do SPI transfer; first 16bits are command; remaining is
63 * register contents */
64 cmd = AIC26_READ_COMMAND_WORD(reg);
65 buffer[0] = (cmd >> 8) & 0xff;
66 buffer[1] = cmd & 0xff;
67 rc = spi_write_then_read(aic26->spi, buffer, 2, buffer, 2);
69 dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
72 value = (buffer[0] << 8) | buffer[1];
74 /* Update the cache before returning with the value */
79 static unsigned int aic26_reg_read_cache(struct snd_soc_codec *codec,
82 u16 *cache = codec->reg_cache;
84 if (reg >= AIC26_NUM_REGS) {
92 static int aic26_reg_write(struct snd_soc_codec *codec, unsigned int reg,
95 struct aic26 *aic26 = codec->private_data;
96 u16 *cache = codec->reg_cache;
101 if (reg >= AIC26_NUM_REGS) {
106 /* Do SPI transfer; first 16bits are command; remaining is data
107 * to write into register */
108 cmd = AIC26_WRITE_COMMAND_WORD(reg);
109 buffer[0] = (cmd >> 8) & 0xff;
110 buffer[1] = cmd & 0xff;
111 buffer[2] = value >> 8;
113 rc = spi_write(aic26->spi, buffer, 4);
115 dev_err(&aic26->spi->dev, "AIC26 reg read error\n");
119 /* update cache before returning */
124 /* ---------------------------------------------------------------------
125 * Digital Audio Interface Operations
127 static int aic26_hw_params(struct snd_pcm_substream *substream,
128 struct snd_pcm_hw_params *params,
129 struct snd_soc_dai *dai)
131 struct snd_soc_pcm_runtime *rtd = substream->private_data;
132 struct snd_soc_device *socdev = rtd->socdev;
133 struct snd_soc_codec *codec = socdev->codec;
134 struct aic26 *aic26 = codec->private_data;
135 int fsref, divisor, wlen, pval, jval, dval, qval;
138 dev_dbg(&aic26->spi->dev, "aic26_hw_params(substream=%p, params=%p)\n",
140 dev_dbg(&aic26->spi->dev, "rate=%i format=%i\n", params_rate(params),
141 params_format(params));
143 switch (params_rate(params)) {
144 case 8000: fsref = 48000; divisor = AIC26_DIV_6; break;
145 case 11025: fsref = 44100; divisor = AIC26_DIV_4; break;
146 case 12000: fsref = 48000; divisor = AIC26_DIV_4; break;
147 case 16000: fsref = 48000; divisor = AIC26_DIV_3; break;
148 case 22050: fsref = 44100; divisor = AIC26_DIV_2; break;
149 case 24000: fsref = 48000; divisor = AIC26_DIV_2; break;
150 case 32000: fsref = 48000; divisor = AIC26_DIV_1_5; break;
151 case 44100: fsref = 44100; divisor = AIC26_DIV_1; break;
152 case 48000: fsref = 48000; divisor = AIC26_DIV_1; break;
154 dev_dbg(&aic26->spi->dev, "bad rate\n"); return -EINVAL;
157 /* select data word length */
158 switch (params_format(params)) {
159 case SNDRV_PCM_FORMAT_S8: wlen = AIC26_WLEN_16; break;
160 case SNDRV_PCM_FORMAT_S16_BE: wlen = AIC26_WLEN_16; break;
161 case SNDRV_PCM_FORMAT_S24_BE: wlen = AIC26_WLEN_24; break;
162 case SNDRV_PCM_FORMAT_S32_BE: wlen = AIC26_WLEN_32; break;
164 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
169 jval = (fsref == 44100) ? 7 : 8;
170 dval = (fsref == 44100) ? 5264 : 1920;
172 reg = 0x8000 | qval << 11 | pval << 8 | jval << 2;
173 aic26_reg_write(codec, AIC26_REG_PLL_PROG1, reg);
175 aic26_reg_write(codec, AIC26_REG_PLL_PROG2, reg);
177 /* Audio Control 3 (master mode, fsref rate) */
178 reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL3);
184 aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL3, reg);
186 /* Audio Control 1 (FSref divisor) */
187 reg = aic26_reg_read_cache(codec, AIC26_REG_AUDIO_CTRL1);
189 reg |= wlen | aic26->datfm | (divisor << 3) | divisor;
190 aic26_reg_write(codec, AIC26_REG_AUDIO_CTRL1, reg);
196 * aic26_mute - Mute control to reduce noise when changing audio format
198 static int aic26_mute(struct snd_soc_dai *dai, int mute)
200 struct snd_soc_codec *codec = dai->codec;
201 struct aic26 *aic26 = codec->private_data;
202 u16 reg = aic26_reg_read_cache(codec, AIC26_REG_DAC_GAIN);
204 dev_dbg(&aic26->spi->dev, "aic26_mute(dai=%p, mute=%i)\n",
211 aic26_reg_write(codec, AIC26_REG_DAC_GAIN, reg);
216 static int aic26_set_sysclk(struct snd_soc_dai *codec_dai,
217 int clk_id, unsigned int freq, int dir)
219 struct snd_soc_codec *codec = codec_dai->codec;
220 struct aic26 *aic26 = codec->private_data;
222 dev_dbg(&aic26->spi->dev, "aic26_set_sysclk(dai=%p, clk_id==%i,"
223 " freq=%i, dir=%i)\n",
224 codec_dai, clk_id, freq, dir);
226 /* MCLK needs to fall between 2MHz and 50 MHz */
227 if ((freq < 2000000) || (freq > 50000000))
234 static int aic26_set_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
236 struct snd_soc_codec *codec = codec_dai->codec;
237 struct aic26 *aic26 = codec->private_data;
239 dev_dbg(&aic26->spi->dev, "aic26_set_fmt(dai=%p, fmt==%i)\n",
242 /* set master/slave audio interface */
243 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
244 case SND_SOC_DAIFMT_CBM_CFM: aic26->master = 1; break;
245 case SND_SOC_DAIFMT_CBS_CFS: aic26->master = 0; break;
247 dev_dbg(&aic26->spi->dev, "bad master\n"); return -EINVAL;
250 /* interface format */
251 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
252 case SND_SOC_DAIFMT_I2S: aic26->datfm = AIC26_DATFM_I2S; break;
253 case SND_SOC_DAIFMT_DSP_A: aic26->datfm = AIC26_DATFM_DSP; break;
254 case SND_SOC_DAIFMT_RIGHT_J: aic26->datfm = AIC26_DATFM_RIGHTJ; break;
255 case SND_SOC_DAIFMT_LEFT_J: aic26->datfm = AIC26_DATFM_LEFTJ; break;
257 dev_dbg(&aic26->spi->dev, "bad format\n"); return -EINVAL;
263 /* ---------------------------------------------------------------------
264 * Digital Audio Interface Definition
266 #define AIC26_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
267 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
268 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
269 SNDRV_PCM_RATE_48000)
270 #define AIC26_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |\
271 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)
273 struct snd_soc_dai aic26_dai = {
274 .name = "tlv320aic26",
276 .stream_name = "Playback",
279 .rates = AIC26_RATES,
280 .formats = AIC26_FORMATS,
283 .stream_name = "Capture",
286 .rates = AIC26_RATES,
287 .formats = AIC26_FORMATS,
290 .hw_params = aic26_hw_params,
291 .digital_mute = aic26_mute,
292 .set_sysclk = aic26_set_sysclk,
293 .set_fmt = aic26_set_fmt,
296 EXPORT_SYMBOL_GPL(aic26_dai);
298 /* ---------------------------------------------------------------------
301 static const char *aic26_capture_src_text[] = {"Mic", "Aux"};
302 static const struct soc_enum aic26_capture_src_enum =
303 SOC_ENUM_SINGLE(AIC26_REG_AUDIO_CTRL1, 12, 2, aic26_capture_src_text);
305 static const struct snd_kcontrol_new aic26_snd_controls[] = {
307 SOC_DOUBLE("PCM Playback Volume", AIC26_REG_DAC_GAIN, 8, 0, 0x7f, 1),
308 SOC_DOUBLE("PCM Playback Switch", AIC26_REG_DAC_GAIN, 15, 7, 1, 1),
309 SOC_SINGLE("PCM Capture Volume", AIC26_REG_ADC_GAIN, 8, 0x7f, 0),
310 SOC_SINGLE("PCM Capture Mute", AIC26_REG_ADC_GAIN, 15, 1, 1),
311 SOC_SINGLE("Keyclick activate", AIC26_REG_AUDIO_CTRL2, 15, 0x1, 0),
312 SOC_SINGLE("Keyclick amplitude", AIC26_REG_AUDIO_CTRL2, 12, 0x7, 0),
313 SOC_SINGLE("Keyclick frequency", AIC26_REG_AUDIO_CTRL2, 8, 0x7, 0),
314 SOC_SINGLE("Keyclick period", AIC26_REG_AUDIO_CTRL2, 4, 0xf, 0),
315 SOC_ENUM("Capture Source", aic26_capture_src_enum),
318 /* ---------------------------------------------------------------------
319 * SoC CODEC portion of driver: probe and release routines
321 static int aic26_probe(struct platform_device *pdev)
323 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
324 struct snd_soc_codec *codec;
325 struct snd_kcontrol *kcontrol;
329 dev_info(&pdev->dev, "Probing AIC26 SoC CODEC driver\n");
330 dev_dbg(&pdev->dev, "socdev=%p\n", socdev);
331 dev_dbg(&pdev->dev, "codec_data=%p\n", socdev->codec_data);
333 /* Fetch the relevant aic26 private data here (it's already been
334 * stored in the .codec pointer) */
335 aic26 = socdev->codec_data;
337 dev_err(&pdev->dev, "aic26: missing codec pointer\n");
340 codec = &aic26->codec;
341 socdev->codec = codec;
343 dev_dbg(&pdev->dev, "Registering PCMs, dev=%p, socdev->dev=%p\n",
344 &pdev->dev, socdev->dev);
346 ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
348 dev_err(&pdev->dev, "aic26: failed to create pcms\n");
352 /* register controls */
353 dev_dbg(&pdev->dev, "Registering controls\n");
354 for (i = 0; i < ARRAY_SIZE(aic26_snd_controls); i++) {
355 kcontrol = snd_soc_cnew(&aic26_snd_controls[i], codec, NULL);
356 err = snd_ctl_add(codec->card, kcontrol);
360 /* CODEC is setup, we can register the card now */
361 dev_dbg(&pdev->dev, "Registering card\n");
362 ret = snd_soc_init_card(socdev);
364 dev_err(&pdev->dev, "aic26: failed to register card\n");
370 snd_soc_free_pcms(socdev);
374 static int aic26_remove(struct platform_device *pdev)
376 struct snd_soc_device *socdev = platform_get_drvdata(pdev);
377 snd_soc_free_pcms(socdev);
381 struct snd_soc_codec_device aic26_soc_codec_dev = {
382 .probe = aic26_probe,
383 .remove = aic26_remove,
385 EXPORT_SYMBOL_GPL(aic26_soc_codec_dev);
387 /* ---------------------------------------------------------------------
388 * SPI device portion of driver: sysfs files for debugging
391 static ssize_t aic26_keyclick_show(struct device *dev,
392 struct device_attribute *attr, char *buf)
394 struct aic26 *aic26 = dev_get_drvdata(dev);
395 int val, amp, freq, len;
397 val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
398 amp = (val >> 12) & 0x7;
399 freq = (125 << ((val >> 8) & 0x7)) >> 1;
400 len = 2 * (1 + ((val >> 4) & 0xf));
402 return sprintf(buf, "amp=%x freq=%iHz len=%iclks\n", amp, freq, len);
405 /* Any write to the keyclick attribute will trigger the keyclick event */
406 static ssize_t aic26_keyclick_set(struct device *dev,
407 struct device_attribute *attr,
408 const char *buf, size_t count)
410 struct aic26 *aic26 = dev_get_drvdata(dev);
413 val = aic26_reg_read_cache(&aic26->codec, AIC26_REG_AUDIO_CTRL2);
415 aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL2, val);
420 static DEVICE_ATTR(keyclick, 0644, aic26_keyclick_show, aic26_keyclick_set);
422 /* ---------------------------------------------------------------------
423 * SPI device portion of driver: probe and release routines and SPI
424 * driver registration.
426 static int aic26_spi_probe(struct spi_device *spi)
431 dev_dbg(&spi->dev, "probing tlv320aic26 spi device\n");
433 /* Allocate driver data */
434 aic26 = kzalloc(sizeof *aic26, GFP_KERNEL);
438 /* Initialize the driver data */
440 dev_set_drvdata(&spi->dev, aic26);
442 /* Setup what we can in the codec structure so that the register
443 * access functions will work as expected. More will be filled
444 * out when it is probed by the SoC CODEC part of this driver */
445 aic26->codec.private_data = aic26;
446 aic26->codec.name = "aic26";
447 aic26->codec.owner = THIS_MODULE;
448 aic26->codec.dai = &aic26_dai;
449 aic26->codec.num_dai = 1;
450 aic26->codec.read = aic26_reg_read;
451 aic26->codec.write = aic26_reg_write;
453 mutex_init(&aic26->codec.mutex);
454 INIT_LIST_HEAD(&aic26->codec.dapm_widgets);
455 INIT_LIST_HEAD(&aic26->codec.dapm_paths);
456 aic26->codec.reg_cache_size = AIC26_NUM_REGS;
457 aic26->codec.reg_cache = aic26->reg_cache;
459 aic26_dai.dev = &spi->dev;
460 ret = snd_soc_register_dai(&aic26_dai);
462 dev_err(&spi->dev, "Failed to register DAI: %d\n", ret);
467 /* Reset the codec to power on defaults */
468 aic26_reg_write(&aic26->codec, AIC26_REG_RESET, 0xBB00);
471 aic26_reg_write(&aic26->codec, AIC26_REG_POWER_CTRL, 0);
473 /* Audio Control 3 (master mode, fsref rate) */
474 reg = aic26_reg_read(&aic26->codec, AIC26_REG_AUDIO_CTRL3);
476 reg |= 0x0800; /* set master mode */
477 aic26_reg_write(&aic26->codec, AIC26_REG_AUDIO_CTRL3, reg);
479 /* Fill register cache */
480 for (i = 0; i < ARRAY_SIZE(aic26->reg_cache); i++)
481 aic26_reg_read(&aic26->codec, i);
483 /* Register the sysfs files for debugging */
484 /* Create SysFS files */
485 ret = device_create_file(&spi->dev, &dev_attr_keyclick);
487 dev_info(&spi->dev, "error creating sysfs files\n");
489 #if defined(CONFIG_SND_SOC_OF_SIMPLE)
490 /* Tell the of_soc helper about this codec */
491 of_snd_soc_register_codec(&aic26_soc_codec_dev, aic26, &aic26_dai,
492 spi->dev.archdata.of_node);
495 dev_dbg(&spi->dev, "SPI device initialized\n");
499 static int aic26_spi_remove(struct spi_device *spi)
501 struct aic26 *aic26 = dev_get_drvdata(&spi->dev);
503 snd_soc_unregister_dai(&aic26_dai);
509 static struct spi_driver aic26_spi = {
511 .name = "tlv320aic26",
512 .owner = THIS_MODULE,
514 .probe = aic26_spi_probe,
515 .remove = aic26_spi_remove,
518 static int __init aic26_init(void)
520 return spi_register_driver(&aic26_spi);
522 module_init(aic26_init);
524 static void __exit aic26_exit(void)
526 spi_unregister_driver(&aic26_spi);
528 module_exit(aic26_exit);