ASoC: Add MAX9850 codec driver
This patch adds ASoC support for the MAX9850 codec with headphone
amplifier.
Supported features:
- Playback
- 16, 20 and 24 bit audio
- 8k - 48k sample rates
- DAPM
Signed-off-by: Christian Glindkamp <christian.glindkamp@taskit.de>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/max9850.c b/sound/soc/codecs/max9850.c
new file mode 100644
index 0000000..6d2c5a3
--- /dev/null
+++ b/sound/soc/codecs/max9850.c
@@ -0,0 +1,389 @@
+/*
+ * max9850.c -- codec driver for max9850
+ *
+ * Copyright (C) 2011 taskit GmbH
+ *
+ * Author: Christian Glindkamp <christian.glindkamp@taskit.de>
+ *
+ * Initial development of this code was funded by
+ * MICRONIC Computer Systeme GmbH, http://www.mcsberlin.de/
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#include "max9850.h"
+
+struct max9850_priv {
+ unsigned int sysclk;
+};
+
+/* max9850 register cache */
+static const u8 max9850_reg[MAX9850_CACHEREGNUM] = {
+ 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+/* these registers are not used at the moment but provided for the sake of
+ * completeness */
+static int max9850_volatile_register(struct snd_soc_codec *codec,
+ unsigned int reg)
+{
+ switch (reg) {
+ case MAX9850_STATUSA:
+ case MAX9850_STATUSB:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static const unsigned int max9850_tlv[] = {
+ TLV_DB_RANGE_HEAD(4),
+ 0x18, 0x1f, TLV_DB_SCALE_ITEM(-7450, 400, 0),
+ 0x20, 0x33, TLV_DB_SCALE_ITEM(-4150, 200, 0),
+ 0x34, 0x37, TLV_DB_SCALE_ITEM(-150, 100, 0),
+ 0x38, 0x3f, TLV_DB_SCALE_ITEM(250, 50, 0),
+};
+
+static const struct snd_kcontrol_new max9850_controls[] = {
+SOC_SINGLE_TLV("Headphone Volume", MAX9850_VOLUME, 0, 0x3f, 1, max9850_tlv),
+SOC_SINGLE("Headphone Switch", MAX9850_VOLUME, 7, 1, 1),
+SOC_SINGLE("Mono Switch", MAX9850_GENERAL_PURPOSE, 2, 1, 0),
+};
+
+static const struct snd_kcontrol_new max9850_mixer_controls[] = {
+ SOC_DAPM_SINGLE("Line In Switch", MAX9850_ENABLE, 1, 1, 0),
+};
+
+static const struct snd_soc_dapm_widget max9850_dapm_widgets[] = {
+SND_SOC_DAPM_SUPPLY("Charge Pump 1", MAX9850_ENABLE, 4, 0, NULL, 0),
+SND_SOC_DAPM_SUPPLY("Charge Pump 2", MAX9850_ENABLE, 5, 0, NULL, 0),
+SND_SOC_DAPM_SUPPLY("MCLK", MAX9850_ENABLE, 6, 0, NULL, 0),
+SND_SOC_DAPM_SUPPLY("SHDN", MAX9850_ENABLE, 7, 0, NULL, 0),
+SND_SOC_DAPM_MIXER_NAMED_CTL("Output Mixer", MAX9850_ENABLE, 2, 0,
+ &max9850_mixer_controls[0],
+ ARRAY_SIZE(max9850_mixer_controls)),
+SND_SOC_DAPM_PGA("Headphone Output", MAX9850_ENABLE, 3, 0, NULL, 0),
+SND_SOC_DAPM_DAC("DAC", "HiFi Playback", MAX9850_ENABLE, 0, 0),
+SND_SOC_DAPM_OUTPUT("OUTL"),
+SND_SOC_DAPM_OUTPUT("HPL"),
+SND_SOC_DAPM_OUTPUT("OUTR"),
+SND_SOC_DAPM_OUTPUT("HPR"),
+SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
+SND_SOC_DAPM_INPUT("INL"),
+SND_SOC_DAPM_INPUT("INR"),
+};
+
+static const struct snd_soc_dapm_route intercon[] = {
+ /* output mixer */
+ {"Output Mixer", NULL, "DAC"},
+ {"Output Mixer", "Line In Switch", "Line Input"},
+
+ /* outputs */
+ {"Headphone Output", NULL, "Output Mixer"},
+ {"HPL", NULL, "Headphone Output"},
+ {"HPR", NULL, "Headphone Output"},
+ {"OUTL", NULL, "Output Mixer"},
+ {"OUTR", NULL, "Output Mixer"},
+
+ /* inputs */
+ {"Line Input", NULL, "INL"},
+ {"Line Input", NULL, "INR"},
+
+ /* supplies */
+ {"Output Mixer", NULL, "Charge Pump 1"},
+ {"Output Mixer", NULL, "Charge Pump 2"},
+ {"Output Mixer", NULL, "SHDN"},
+ {"DAC", NULL, "MCLK"},
+};
+
+static int max9850_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_codec *codec = dai->codec;
+ struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
+ u64 lrclk_div;
+ u8 sf, da;
+
+ if(!max9850->sysclk)
+ return -EINVAL;
+
+ /* lrclk_div = 2^22 * rate / iclk with iclk = mclk / sf */
+ sf = (snd_soc_read(codec, MAX9850_CLOCK) >> 2) + 1;
+ lrclk_div = (1 << 22);
+ lrclk_div *= params_rate(params);
+ lrclk_div *= sf;
+ do_div(lrclk_div, max9850->sysclk);
+
+ snd_soc_write(codec, MAX9850_LRCLK_MSB, (lrclk_div >> 8) & 0x7f);
+ snd_soc_write(codec, MAX9850_LRCLK_LSB, lrclk_div & 0xff);
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ da = 0;
+ break;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ da = 0x2;
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ da = 0x3;
+ break;
+ default:
+ return -EINVAL;
+ }
+ snd_soc_update_bits(codec, MAX9850_DIGITAL_AUDIO, 0x3, da);
+
+ return 0;
+}
+
+static int max9850_set_dai_sysclk(struct snd_soc_dai *codec_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec);
+
+ /* calculate mclk -> iclk divider */
+ if (freq <= 13000000)
+ snd_soc_write(codec, MAX9850_CLOCK, 0x0);
+ else if (freq <= 26000000)
+ snd_soc_write(codec, MAX9850_CLOCK, 0x4);
+ else if (freq <= 40000000)
+ snd_soc_write(codec, MAX9850_CLOCK, 0x8);
+ else
+ return -EINVAL;
+
+ max9850->sysclk = freq;
+ return 0;
+}
+
+static int max9850_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ u8 da = 0;
+
+ /* set master/slave audio interface */
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ da |= MAX9850_MASTER;
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* interface format */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ da |= MAX9850_DLY;
+ break;
+ case SND_SOC_DAIFMT_RIGHT_J:
+ da |= MAX9850_RTJ;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* clock inversion */
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ case SND_SOC_DAIFMT_IB_IF:
+ da |= MAX9850_BCINV | MAX9850_INV;
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ da |= MAX9850_BCINV;
+ break;
+ case SND_SOC_DAIFMT_NB_IF:
+ da |= MAX9850_INV;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* set da */
+ snd_soc_write(codec, MAX9850_DIGITAL_AUDIO, da);
+
+ return 0;
+}
+
+static int max9850_set_bias_level(struct snd_soc_codec *codec,
+ enum snd_soc_bias_level level)
+{
+ int ret;
+
+ switch (level) {
+ case SND_SOC_BIAS_ON:
+ break;
+ case SND_SOC_BIAS_PREPARE:
+ break;
+ case SND_SOC_BIAS_STANDBY:
+ if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
+ ret = snd_soc_cache_sync(codec);
+ if (ret) {
+ dev_err(codec->dev,
+ "Failed to sync cache: %d\n", ret);
+ return ret;
+ }
+ }
+ break;
+ case SND_SOC_BIAS_OFF:
+ break;
+ }
+ codec->dapm.bias_level = level;
+ return 0;
+}
+
+#define MAX9850_RATES SNDRV_PCM_RATE_8000_48000
+
+#define MAX9850_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
+ SNDRV_PCM_FMTBIT_S24_LE)
+
+static struct snd_soc_dai_ops max9850_dai_ops = {
+ .hw_params = max9850_hw_params,
+ .set_sysclk = max9850_set_dai_sysclk,
+ .set_fmt = max9850_set_dai_fmt,
+};
+
+static struct snd_soc_dai_driver max9850_dai = {
+ .name = "max9850-hifi",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = MAX9850_RATES,
+ .formats = MAX9850_FORMATS
+ },
+ .ops = &max9850_dai_ops,
+};
+
+#ifdef CONFIG_PM
+static int max9850_suspend(struct snd_soc_codec *codec, pm_message_t state)
+{
+ max9850_set_bias_level(codec, SND_SOC_BIAS_OFF);
+
+ return 0;
+}
+
+static int max9850_resume(struct snd_soc_codec *codec)
+{
+ max9850_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
+
+ return 0;
+}
+#else
+#define max9850_suspend NULL
+#define max9850_resume NULL
+#endif
+
+static int max9850_probe(struct snd_soc_codec *codec)
+{
+ struct snd_soc_dapm_context *dapm = &codec->dapm;
+ int ret;
+
+ ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_I2C);
+ if (ret < 0) {
+ dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
+ return ret;
+ }
+
+ /* enable zero-detect */
+ snd_soc_update_bits(codec, MAX9850_GENERAL_PURPOSE, 1, 1);
+ /* enable slew-rate control */
+ snd_soc_update_bits(codec, MAX9850_VOLUME, 0x40, 0x40);
+ /* set slew-rate 125ms */
+ snd_soc_update_bits(codec, MAX9850_CHARGE_PUMP, 0xff, 0xc0);
+
+ snd_soc_dapm_new_controls(dapm, max9850_dapm_widgets,
+ ARRAY_SIZE(max9850_dapm_widgets));
+ snd_soc_dapm_add_routes(dapm, intercon, ARRAY_SIZE(intercon));
+
+ snd_soc_add_controls(codec, max9850_controls,
+ ARRAY_SIZE(max9850_controls));
+
+ return 0;
+}
+
+static struct snd_soc_codec_driver soc_codec_dev_max9850 = {
+ .probe = max9850_probe,
+ .suspend = max9850_suspend,
+ .resume = max9850_resume,
+ .set_bias_level = max9850_set_bias_level,
+ .reg_cache_size = ARRAY_SIZE(max9850_reg),
+ .reg_word_size = sizeof(u8),
+ .reg_cache_default = max9850_reg,
+ .volatile_register = max9850_volatile_register,
+};
+
+static int __devinit max9850_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct max9850_priv *max9850;
+ int ret;
+
+ max9850 = kzalloc(sizeof(struct max9850_priv), GFP_KERNEL);
+ if (max9850 == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, max9850);
+
+ ret = snd_soc_register_codec(&i2c->dev,
+ &soc_codec_dev_max9850, &max9850_dai, 1);
+ if (ret < 0)
+ kfree(max9850);
+ return ret;
+}
+
+static __devexit int max9850_i2c_remove(struct i2c_client *client)
+{
+ snd_soc_unregister_codec(&client->dev);
+ kfree(i2c_get_clientdata(client));
+ return 0;
+}
+
+static const struct i2c_device_id max9850_i2c_id[] = {
+ { "max9850", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max9850_i2c_id);
+
+static struct i2c_driver max9850_i2c_driver = {
+ .driver = {
+ .name = "max9850",
+ .owner = THIS_MODULE,
+ },
+ .probe = max9850_i2c_probe,
+ .remove = __devexit_p(max9850_i2c_remove),
+ .id_table = max9850_i2c_id,
+};
+
+static int __init max9850_init(void)
+{
+ return i2c_add_driver(&max9850_i2c_driver);
+}
+module_init(max9850_init);
+
+static void __exit max9850_exit(void)
+{
+ i2c_del_driver(&max9850_i2c_driver);
+}
+module_exit(max9850_exit);
+
+MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>");
+MODULE_DESCRIPTION("ASoC MAX9850 codec driver");
+MODULE_LICENSE("GPL");