2 * wm8741.c -- WM8741 ALSA SoC Audio driver
4 * Copyright 2010 Wolfson Microelectronics plc
6 * Author: Ian Lartey <ian@opensource.wolfsonmicro.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/module.h>
15 #include <linux/moduleparam.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
19 #include <linux/i2c.h>
20 #include <linux/platform_device.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/slab.h>
23 #include <sound/core.h>
24 #include <sound/pcm.h>
25 #include <sound/pcm_params.h>
26 #include <sound/soc.h>
27 #include <sound/soc-dapm.h>
28 #include <sound/initval.h>
29 #include <sound/tlv.h>
33 #define WM8741_NUM_SUPPLIES 2
34 static const char *wm8741_supply_names[WM8741_NUM_SUPPLIES] = {
39 #define WM8741_NUM_RATES 6
41 /* codec private data */
43 enum snd_soc_control_type control_type;
44 u16 reg_cache[WM8741_REGISTER_COUNT];
45 struct regulator_bulk_data supplies[WM8741_NUM_SUPPLIES];
47 struct snd_pcm_hw_constraint_list *sysclk_constraints;
50 static const u16 wm8741_reg_defaults[WM8741_REGISTER_COUNT] = {
51 0x0000, /* R0 - DACLLSB Attenuation */
52 0x0000, /* R1 - DACLMSB Attenuation */
53 0x0000, /* R2 - DACRLSB Attenuation */
54 0x0000, /* R3 - DACRMSB Attenuation */
55 0x0000, /* R4 - Volume Control */
56 0x000A, /* R5 - Format Control */
57 0x0000, /* R6 - Filter Control */
58 0x0000, /* R7 - Mode Control 1 */
59 0x0002, /* R8 - Mode Control 2 */
60 0x0000, /* R9 - Reset */
61 0x0002, /* R32 - ADDITONAL_CONTROL_1 */
65 static int wm8741_reset(struct snd_soc_codec *codec)
67 return snd_soc_write(codec, WM8741_RESET, 0);
70 static const DECLARE_TLV_DB_SCALE(dac_tlv_fine, -12700, 13, 0);
71 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12700, 400, 0);
73 static const struct snd_kcontrol_new wm8741_snd_controls[] = {
74 SOC_DOUBLE_R_TLV("Fine Playback Volume", WM8741_DACLLSB_ATTENUATION,
75 WM8741_DACRLSB_ATTENUATION, 1, 255, 1, dac_tlv_fine),
76 SOC_DOUBLE_R_TLV("Playback Volume", WM8741_DACLMSB_ATTENUATION,
77 WM8741_DACRMSB_ATTENUATION, 0, 511, 1, dac_tlv),
80 static const struct snd_soc_dapm_widget wm8741_dapm_widgets[] = {
81 SND_SOC_DAPM_DAC("DACL", "Playback", SND_SOC_NOPM, 0, 0),
82 SND_SOC_DAPM_DAC("DACR", "Playback", SND_SOC_NOPM, 0, 0),
83 SND_SOC_DAPM_OUTPUT("VOUTLP"),
84 SND_SOC_DAPM_OUTPUT("VOUTLN"),
85 SND_SOC_DAPM_OUTPUT("VOUTRP"),
86 SND_SOC_DAPM_OUTPUT("VOUTRN"),
89 static const struct snd_soc_dapm_route intercon[] = {
90 { "VOUTLP", NULL, "DACL" },
91 { "VOUTLN", NULL, "DACL" },
92 { "VOUTRP", NULL, "DACR" },
93 { "VOUTRN", NULL, "DACR" },
96 static int wm8741_add_widgets(struct snd_soc_codec *codec)
98 snd_soc_dapm_new_controls(codec, wm8741_dapm_widgets,
99 ARRAY_SIZE(wm8741_dapm_widgets));
101 snd_soc_dapm_add_routes(codec, intercon, ARRAY_SIZE(intercon));
109 } lrclk_ratios[WM8741_NUM_RATES] = {
118 static unsigned int rates_11289[] = {
122 static struct snd_pcm_hw_constraint_list constraints_11289 = {
123 .count = ARRAY_SIZE(rates_11289),
127 static unsigned int rates_12288[] = {
131 static struct snd_pcm_hw_constraint_list constraints_12288 = {
132 .count = ARRAY_SIZE(rates_12288),
136 static unsigned int rates_16384[] = {
140 static struct snd_pcm_hw_constraint_list constraints_16384 = {
141 .count = ARRAY_SIZE(rates_16384),
145 static unsigned int rates_16934[] = {
149 static struct snd_pcm_hw_constraint_list constraints_16934 = {
150 .count = ARRAY_SIZE(rates_16934),
154 static unsigned int rates_18432[] = {
158 static struct snd_pcm_hw_constraint_list constraints_18432 = {
159 .count = ARRAY_SIZE(rates_18432),
163 static unsigned int rates_22579[] = {
164 44100, 88235, 1764000
167 static struct snd_pcm_hw_constraint_list constraints_22579 = {
168 .count = ARRAY_SIZE(rates_22579),
172 static unsigned int rates_24576[] = {
173 32000, 48000, 96000, 192000
176 static struct snd_pcm_hw_constraint_list constraints_24576 = {
177 .count = ARRAY_SIZE(rates_24576),
181 static unsigned int rates_36864[] = {
185 static struct snd_pcm_hw_constraint_list constraints_36864 = {
186 .count = ARRAY_SIZE(rates_36864),
191 static int wm8741_startup(struct snd_pcm_substream *substream,
192 struct snd_soc_dai *dai)
194 struct snd_soc_codec *codec = dai->codec;
195 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
197 /* The set of sample rates that can be supported depends on the
198 * MCLK supplied to the CODEC - enforce this.
200 if (!wm8741->sysclk) {
202 "No MCLK configured, call set_sysclk() on init\n");
206 snd_pcm_hw_constraint_list(substream->runtime, 0,
207 SNDRV_PCM_HW_PARAM_RATE,
208 wm8741->sysclk_constraints);
213 static int wm8741_hw_params(struct snd_pcm_substream *substream,
214 struct snd_pcm_hw_params *params,
215 struct snd_soc_dai *dai)
217 struct snd_soc_pcm_runtime *rtd = substream->private_data;
218 struct snd_soc_codec *codec = rtd->codec;
219 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
220 u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1FC;
223 /* Find a supported LRCLK ratio */
224 for (i = 0; i < ARRAY_SIZE(lrclk_ratios); i++) {
225 if (wm8741->sysclk / params_rate(params) ==
226 lrclk_ratios[i].ratio)
230 /* Should never happen, should be handled by constraints */
231 if (i == ARRAY_SIZE(lrclk_ratios)) {
232 dev_err(codec->dev, "MCLK/fs ratio %d unsupported\n",
233 wm8741->sysclk / params_rate(params));
238 switch (params_format(params)) {
239 case SNDRV_PCM_FORMAT_S16_LE:
241 case SNDRV_PCM_FORMAT_S20_3LE:
244 case SNDRV_PCM_FORMAT_S24_LE:
247 case SNDRV_PCM_FORMAT_S32_LE:
251 dev_dbg(codec->dev, "wm8741_hw_params: Unsupported bit size param = %d",
252 params_format(params));
256 dev_dbg(codec->dev, "wm8741_hw_params: bit size param = %d",
257 params_format(params));
259 snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
263 static int wm8741_set_dai_sysclk(struct snd_soc_dai *codec_dai,
264 int clk_id, unsigned int freq, int dir)
266 struct snd_soc_codec *codec = codec_dai->codec;
267 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
269 dev_dbg(codec->dev, "wm8741_set_dai_sysclk info: freq=%dHz\n", freq);
273 wm8741->sysclk_constraints = &constraints_11289;
274 wm8741->sysclk = freq;
278 wm8741->sysclk_constraints = &constraints_12288;
279 wm8741->sysclk = freq;
283 wm8741->sysclk_constraints = &constraints_16384;
284 wm8741->sysclk = freq;
288 wm8741->sysclk_constraints = &constraints_16934;
289 wm8741->sysclk = freq;
293 wm8741->sysclk_constraints = &constraints_18432;
294 wm8741->sysclk = freq;
299 wm8741->sysclk_constraints = &constraints_22579;
300 wm8741->sysclk = freq;
304 wm8741->sysclk_constraints = &constraints_24576;
305 wm8741->sysclk = freq;
309 wm8741->sysclk_constraints = &constraints_36864;
310 wm8741->sysclk = freq;
316 static int wm8741_set_dai_fmt(struct snd_soc_dai *codec_dai,
319 struct snd_soc_codec *codec = codec_dai->codec;
320 u16 iface = snd_soc_read(codec, WM8741_FORMAT_CONTROL) & 0x1C3;
322 /* check master/slave audio interface */
323 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
324 case SND_SOC_DAIFMT_CBS_CFS:
330 /* interface format */
331 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
332 case SND_SOC_DAIFMT_I2S:
335 case SND_SOC_DAIFMT_RIGHT_J:
337 case SND_SOC_DAIFMT_LEFT_J:
340 case SND_SOC_DAIFMT_DSP_A:
343 case SND_SOC_DAIFMT_DSP_B:
350 /* clock inversion */
351 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
352 case SND_SOC_DAIFMT_NB_NF:
354 case SND_SOC_DAIFMT_IB_IF:
357 case SND_SOC_DAIFMT_IB_NF:
360 case SND_SOC_DAIFMT_NB_IF:
368 dev_dbg(codec->dev, "wm8741_set_dai_fmt: Format=%x, Clock Inv=%x\n",
369 fmt & SND_SOC_DAIFMT_FORMAT_MASK,
370 ((fmt & SND_SOC_DAIFMT_INV_MASK)));
372 snd_soc_write(codec, WM8741_FORMAT_CONTROL, iface);
376 #define WM8741_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
377 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \
378 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \
379 SNDRV_PCM_RATE_192000)
381 #define WM8741_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
382 SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)
384 static struct snd_soc_dai_ops wm8741_dai_ops = {
385 .startup = wm8741_startup,
386 .hw_params = wm8741_hw_params,
387 .set_sysclk = wm8741_set_dai_sysclk,
388 .set_fmt = wm8741_set_dai_fmt,
391 static struct snd_soc_dai_driver wm8741_dai = {
394 .stream_name = "Playback",
395 .channels_min = 2, /* Mono modes not yet supported */
397 .rates = WM8741_RATES,
398 .formats = WM8741_FORMATS,
400 .ops = &wm8741_dai_ops,
404 static int wm8741_resume(struct snd_soc_codec *codec)
406 u16 *cache = codec->reg_cache;
409 /* RESTORE REG Cache */
410 for (i = 0; i < WM8741_REGISTER_COUNT; i++) {
411 if (cache[i] == wm8741_reg_defaults[i] || WM8741_RESET == i)
413 snd_soc_write(codec, i, cache[i]);
418 #define wm8741_suspend NULL
419 #define wm8741_resume NULL
422 static int wm8741_probe(struct snd_soc_codec *codec)
424 struct wm8741_priv *wm8741 = snd_soc_codec_get_drvdata(codec);
427 ret = snd_soc_codec_set_cache_io(codec, 7, 9, wm8741->control_type);
429 dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
433 ret = wm8741_reset(codec);
435 dev_err(codec->dev, "Failed to issue reset\n");
439 /* Change some default settings - latch VU */
440 wm8741->reg_cache[WM8741_DACLLSB_ATTENUATION] |= WM8741_UPDATELL;
441 wm8741->reg_cache[WM8741_DACLMSB_ATTENUATION] |= WM8741_UPDATELM;
442 wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERL;
443 wm8741->reg_cache[WM8741_DACRLSB_ATTENUATION] |= WM8741_UPDATERM;
445 snd_soc_add_controls(codec, wm8741_snd_controls,
446 ARRAY_SIZE(wm8741_snd_controls));
447 wm8741_add_widgets(codec);
449 dev_dbg(codec->dev, "Successful registration\n");
453 static struct snd_soc_codec_driver soc_codec_dev_wm8741 = {
454 .probe = wm8741_probe,
455 .resume = wm8741_resume,
456 .reg_cache_size = ARRAY_SIZE(wm8741_reg_defaults),
457 .reg_word_size = sizeof(u16),
458 .reg_cache_default = &wm8741_reg_defaults,
461 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
462 static int wm8741_i2c_probe(struct i2c_client *i2c,
463 const struct i2c_device_id *id)
465 struct wm8741_priv *wm8741;
468 wm8741 = kzalloc(sizeof(struct wm8741_priv), GFP_KERNEL);
472 for (i = 0; i < ARRAY_SIZE(wm8741->supplies); i++)
473 wm8741->supplies[i].supply = wm8741_supply_names[i];
475 ret = regulator_bulk_get(&i2c->dev, ARRAY_SIZE(wm8741->supplies),
478 dev_err(&i2c->dev, "Failed to request supplies: %d\n", ret);
482 ret = regulator_bulk_enable(ARRAY_SIZE(wm8741->supplies),
485 dev_err(&i2c->dev, "Failed to enable supplies: %d\n", ret);
489 i2c_set_clientdata(i2c, wm8741);
490 wm8741->control_type = SND_SOC_I2C;
492 ret = snd_soc_register_codec(&i2c->dev,
493 &soc_codec_dev_wm8741, &wm8741_dai, 1);
499 regulator_bulk_disable(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
502 regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
508 static int wm8741_i2c_remove(struct i2c_client *client)
510 struct wm8741_priv *wm8741 = i2c_get_clientdata(client);
512 snd_soc_unregister_codec(&client->dev);
513 regulator_bulk_free(ARRAY_SIZE(wm8741->supplies), wm8741->supplies);
514 kfree(i2c_get_clientdata(client));
518 static const struct i2c_device_id wm8741_i2c_id[] = {
522 MODULE_DEVICE_TABLE(i2c, wm8741_i2c_id);
524 static struct i2c_driver wm8741_i2c_driver = {
526 .name = "wm8741-codec",
527 .owner = THIS_MODULE,
529 .probe = wm8741_i2c_probe,
530 .remove = wm8741_i2c_remove,
531 .id_table = wm8741_i2c_id,
535 static int __init wm8741_modinit(void)
539 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
540 ret = i2c_add_driver(&wm8741_i2c_driver);
542 pr_err("Failed to register WM8741 I2C driver: %d\n", ret);
547 module_init(wm8741_modinit);
549 static void __exit wm8741_exit(void)
551 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
552 i2c_del_driver(&wm8741_i2c_driver);
555 module_exit(wm8741_exit);
557 MODULE_DESCRIPTION("ASoC WM8741 driver");
558 MODULE_AUTHOR("Ian Lartey <ian@opensource.wolfsonmicro.com>");
559 MODULE_LICENSE("GPL");