/* * 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/regmap.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 { struct regmap *regmap; unsigned int sysclk; }; /* max9850 register cache */ static const struct reg_default max9850_reg[] = { { 2, 0x0c }, { 3, 0x00 }, { 4, 0x00 }, { 5, 0x00 }, { 6, 0x00 }, { 7, 0x00 }, { 8, 0x00 }, { 9, 0x00 }, { 10, 0x00 }, }; /* these registers are not used at the moment but provided for the sake of * completeness */ static bool max9850_volatile_register(struct device *dev, unsigned int reg) { switch (reg) { case MAX9850_STATUSA: case MAX9850_STATUSB: return 1; default: return 0; } } static const struct regmap_config max9850_regmap = { .reg_bits = 8, .val_bits = 8, .max_register = MAX9850_DIGITAL_AUDIO, .volatile_reg = max9850_volatile_register, .cache_type = REGCACHE_RBTREE, }; 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 max9850_dapm_routes[] = { /* 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_width(params)) { case 16: da = 0; break; case 20: da = 0x2; break; case 24: 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) { struct max9850_priv *max9850 = snd_soc_codec_get_drvdata(codec); int ret; switch (level) { case SND_SOC_BIAS_ON: break; case SND_SOC_BIAS_PREPARE: break; case SND_SOC_BIAS_STANDBY: if (snd_soc_codec_get_bias_level(codec) == SND_SOC_BIAS_OFF) { ret = regcache_sync(max9850->regmap); if (ret) { dev_err(codec->dev, "Failed to sync cache: %d\n", ret); return ret; } } break; case SND_SOC_BIAS_OFF: break; } 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 const 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, }; static int max9850_probe(struct snd_soc_codec *codec) { /* 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); return 0; } static struct snd_soc_codec_driver soc_codec_dev_max9850 = { .probe = max9850_probe, .set_bias_level = max9850_set_bias_level, .suspend_bias_off = true, .controls = max9850_controls, .num_controls = ARRAY_SIZE(max9850_controls), .dapm_widgets = max9850_dapm_widgets, .num_dapm_widgets = ARRAY_SIZE(max9850_dapm_widgets), .dapm_routes = max9850_dapm_routes, .num_dapm_routes = ARRAY_SIZE(max9850_dapm_routes), }; static int max9850_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct max9850_priv *max9850; int ret; max9850 = devm_kzalloc(&i2c->dev, sizeof(struct max9850_priv), GFP_KERNEL); if (max9850 == NULL) return -ENOMEM; max9850->regmap = devm_regmap_init_i2c(i2c, &max9850_regmap); if (IS_ERR(max9850->regmap)) return PTR_ERR(max9850->regmap); i2c_set_clientdata(i2c, max9850); ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_max9850, &max9850_dai, 1); return ret; } static int max9850_i2c_remove(struct i2c_client *client) { snd_soc_unregister_codec(&client->dev); 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 = max9850_i2c_remove, .id_table = max9850_i2c_id, }; module_i2c_driver(max9850_i2c_driver); MODULE_AUTHOR("Christian Glindkamp <christian.glindkamp@taskit.de>"); MODULE_DESCRIPTION("ASoC MAX9850 codec driver"); MODULE_LICENSE("GPL");