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* ak4535.c -- AK4535 ALSA Soc Audio driver
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* Copyright 2005 Openedhand Ltd.
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* Author: Richard Purdie <richard@openedhand.com>
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* Based on wm8753.c by Liam Girdwood
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/initval.h>
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#define AK4535_VERSION "0.3"
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/* codec private data */
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enum snd_soc_control_type control_type;
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* ak4535 register cache
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static const u8 ak4535_reg[AK4535_CACHEREGNUM] = {
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0x00, 0x80, 0x00, 0x03,
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0x02, 0x00, 0x11, 0x01,
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0x00, 0x40, 0x36, 0x10,
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0x00, 0x00, 0x57, 0x00,
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static const char *ak4535_mono_gain[] = {"+6dB", "-17dB"};
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static const char *ak4535_mono_out[] = {"(L + R)/2", "Hi-Z"};
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static const char *ak4535_hp_out[] = {"Stereo", "Mono"};
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static const char *ak4535_deemp[] = {"44.1kHz", "Off", "48kHz", "32kHz"};
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static const char *ak4535_mic_select[] = {"Internal", "External"};
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static const struct soc_enum ak4535_enum[] = {
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SOC_ENUM_SINGLE(AK4535_SIG1, 7, 2, ak4535_mono_gain),
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SOC_ENUM_SINGLE(AK4535_SIG1, 6, 2, ak4535_mono_out),
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SOC_ENUM_SINGLE(AK4535_MODE2, 2, 2, ak4535_hp_out),
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SOC_ENUM_SINGLE(AK4535_DAC, 0, 4, ak4535_deemp),
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SOC_ENUM_SINGLE(AK4535_MIC, 1, 2, ak4535_mic_select),
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static const struct snd_kcontrol_new ak4535_snd_controls[] = {
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SOC_SINGLE("ALC2 Switch", AK4535_SIG1, 1, 1, 0),
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SOC_ENUM("Mono 1 Output", ak4535_enum[1]),
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SOC_ENUM("Mono 1 Gain", ak4535_enum[0]),
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SOC_ENUM("Headphone Output", ak4535_enum[2]),
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SOC_ENUM("Playback Deemphasis", ak4535_enum[3]),
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SOC_SINGLE("Bass Volume", AK4535_DAC, 2, 3, 0),
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SOC_SINGLE("Mic Boost (+20dB) Switch", AK4535_MIC, 0, 1, 0),
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SOC_ENUM("Mic Select", ak4535_enum[4]),
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SOC_SINGLE("ALC Operation Time", AK4535_TIMER, 0, 3, 0),
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SOC_SINGLE("ALC Recovery Time", AK4535_TIMER, 2, 3, 0),
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SOC_SINGLE("ALC ZC Time", AK4535_TIMER, 4, 3, 0),
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SOC_SINGLE("ALC 1 Switch", AK4535_ALC1, 5, 1, 0),
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SOC_SINGLE("ALC 2 Switch", AK4535_ALC1, 6, 1, 0),
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SOC_SINGLE("ALC Volume", AK4535_ALC2, 0, 127, 0),
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SOC_SINGLE("Capture Volume", AK4535_PGA, 0, 127, 0),
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SOC_SINGLE("Left Playback Volume", AK4535_LATT, 0, 127, 1),
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SOC_SINGLE("Right Playback Volume", AK4535_RATT, 0, 127, 1),
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SOC_SINGLE("AUX Bypass Volume", AK4535_VOL, 0, 15, 0),
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SOC_SINGLE("Mic Sidetone Volume", AK4535_VOL, 4, 7, 0),
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static const struct snd_kcontrol_new ak4535_mono1_mixer_controls[] = {
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SOC_DAPM_SINGLE("Mic Sidetone Switch", AK4535_SIG1, 4, 1, 0),
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SOC_DAPM_SINGLE("Mono Playback Switch", AK4535_SIG1, 5, 1, 0),
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static const struct snd_kcontrol_new ak4535_stereo_mixer_controls[] = {
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SOC_DAPM_SINGLE("Mic Sidetone Switch", AK4535_SIG2, 4, 1, 0),
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SOC_DAPM_SINGLE("Playback Switch", AK4535_SIG2, 7, 1, 0),
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SOC_DAPM_SINGLE("Aux Bypass Switch", AK4535_SIG2, 5, 1, 0),
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static const struct snd_kcontrol_new ak4535_input_mixer_controls[] = {
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SOC_DAPM_SINGLE("Mic Capture Switch", AK4535_MIC, 2, 1, 0),
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SOC_DAPM_SINGLE("Aux Capture Switch", AK4535_MIC, 5, 1, 0),
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static const struct snd_kcontrol_new ak4535_input_mux_control =
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SOC_DAPM_ENUM("Input Select", ak4535_enum[4]);
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static const struct snd_kcontrol_new ak4535_hpl_control =
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SOC_DAPM_SINGLE("Switch", AK4535_SIG2, 1, 1, 1);
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static const struct snd_kcontrol_new ak4535_hpr_control =
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SOC_DAPM_SINGLE("Switch", AK4535_SIG2, 0, 1, 1);
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static const struct snd_kcontrol_new ak4535_mono2_control =
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SOC_DAPM_SINGLE("Switch", AK4535_SIG1, 0, 1, 0);
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/* Line out switch */
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static const struct snd_kcontrol_new ak4535_line_control =
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SOC_DAPM_SINGLE("Switch", AK4535_SIG2, 6, 1, 0);
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/* ak4535 dapm widgets */
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static const struct snd_soc_dapm_widget ak4535_dapm_widgets[] = {
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SND_SOC_DAPM_MIXER("Stereo Mixer", SND_SOC_NOPM, 0, 0,
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&ak4535_stereo_mixer_controls[0],
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ARRAY_SIZE(ak4535_stereo_mixer_controls)),
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SND_SOC_DAPM_MIXER("Mono1 Mixer", SND_SOC_NOPM, 0, 0,
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&ak4535_mono1_mixer_controls[0],
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ARRAY_SIZE(ak4535_mono1_mixer_controls)),
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SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0,
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&ak4535_input_mixer_controls[0],
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ARRAY_SIZE(ak4535_input_mixer_controls)),
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SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
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&ak4535_input_mux_control),
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SND_SOC_DAPM_DAC("DAC", "Playback", AK4535_PM2, 0, 0),
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SND_SOC_DAPM_SWITCH("Mono 2 Enable", SND_SOC_NOPM, 0, 0,
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&ak4535_mono2_control),
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/* speaker powersave bit */
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SND_SOC_DAPM_PGA("Speaker Enable", AK4535_MODE2, 0, 0, NULL, 0),
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SND_SOC_DAPM_SWITCH("Line Out Enable", SND_SOC_NOPM, 0, 0,
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&ak4535_line_control),
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SND_SOC_DAPM_SWITCH("Left HP Enable", SND_SOC_NOPM, 0, 0,
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&ak4535_hpl_control),
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SND_SOC_DAPM_SWITCH("Right HP Enable", SND_SOC_NOPM, 0, 0,
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&ak4535_hpr_control),
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SND_SOC_DAPM_OUTPUT("LOUT"),
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SND_SOC_DAPM_OUTPUT("HPL"),
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SND_SOC_DAPM_OUTPUT("ROUT"),
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SND_SOC_DAPM_OUTPUT("HPR"),
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SND_SOC_DAPM_OUTPUT("SPP"),
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SND_SOC_DAPM_OUTPUT("SPN"),
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SND_SOC_DAPM_OUTPUT("MOUT1"),
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SND_SOC_DAPM_OUTPUT("MOUT2"),
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SND_SOC_DAPM_OUTPUT("MICOUT"),
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SND_SOC_DAPM_ADC("ADC", "Capture", AK4535_PM1, 0, 0),
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SND_SOC_DAPM_PGA("Spk Amp", AK4535_PM2, 3, 0, NULL, 0),
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SND_SOC_DAPM_PGA("HP R Amp", AK4535_PM2, 1, 0, NULL, 0),
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SND_SOC_DAPM_PGA("HP L Amp", AK4535_PM2, 2, 0, NULL, 0),
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SND_SOC_DAPM_PGA("Mic", AK4535_PM1, 1, 0, NULL, 0),
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SND_SOC_DAPM_PGA("Line Out", AK4535_PM1, 4, 0, NULL, 0),
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SND_SOC_DAPM_PGA("Mono Out", AK4535_PM1, 3, 0, NULL, 0),
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SND_SOC_DAPM_PGA("AUX In", AK4535_PM1, 2, 0, NULL, 0),
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SND_SOC_DAPM_MICBIAS("Mic Int Bias", AK4535_MIC, 3, 0),
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SND_SOC_DAPM_MICBIAS("Mic Ext Bias", AK4535_MIC, 4, 0),
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SND_SOC_DAPM_INPUT("MICIN"),
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SND_SOC_DAPM_INPUT("MICEXT"),
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SND_SOC_DAPM_INPUT("AUX"),
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SND_SOC_DAPM_INPUT("MIN"),
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SND_SOC_DAPM_INPUT("AIN"),
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static const struct snd_soc_dapm_route ak4535_audio_map[] = {
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{"Stereo Mixer", "Playback Switch", "DAC"},
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{"Stereo Mixer", "Mic Sidetone Switch", "Mic"},
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{"Stereo Mixer", "Aux Bypass Switch", "AUX In"},
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{"Mono1 Mixer", "Mic Sidetone Switch", "Mic"},
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{"Mono1 Mixer", "Mono Playback Switch", "DAC"},
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{"Mic", NULL, "AIN"},
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{"Input Mux", "Internal", "Mic Int Bias"},
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{"Input Mux", "External", "Mic Ext Bias"},
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{"Mic Int Bias", NULL, "MICIN"},
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{"Mic Ext Bias", NULL, "MICEXT"},
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{"MICOUT", NULL, "Input Mux"},
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{"LOUT", NULL, "Line Out Enable"},
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{"ROUT", NULL, "Line Out Enable"},
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{"Line Out Enable", "Switch", "Line Out"},
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{"Line Out", NULL, "Stereo Mixer"},
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{"MOUT1", NULL, "Mono Out"},
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{"Mono Out", NULL, "Mono1 Mixer"},
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{"HPL", NULL, "Left HP Enable"},
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{"Left HP Enable", "Switch", "HP L Amp"},
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{"HP L Amp", NULL, "Stereo Mixer"},
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{"HPR", NULL, "Right HP Enable"},
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{"Right HP Enable", "Switch", "HP R Amp"},
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{"HP R Amp", NULL, "Stereo Mixer"},
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{"SPP", NULL, "Speaker Enable"},
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{"SPN", NULL, "Speaker Enable"},
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{"Speaker Enable", "Switch", "Spk Amp"},
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{"Spk Amp", NULL, "MIN"},
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{"MOUT2", NULL, "Mono 2 Enable"},
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{"Mono 2 Enable", "Switch", "Stereo Mixer"},
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{"Aux In", NULL, "AUX"},
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{"ADC", NULL, "Input Mixer"},
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{"Input Mixer", "Mic Capture Switch", "Mic"},
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{"Input Mixer", "Aux Capture Switch", "Aux In"},
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static int ak4535_set_dai_sysclk(struct snd_soc_dai *codec_dai,
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int clk_id, unsigned int freq, int dir)
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struct snd_soc_codec *codec = codec_dai->codec;
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struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
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ak4535->sysclk = freq;
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static int ak4535_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_codec *codec = rtd->codec;
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struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
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u8 mode2 = snd_soc_read(codec, AK4535_MODE2) & ~(0x3 << 5);
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int rate = params_rate(params), fs = 256;
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fs = ak4535->sysclk / rate;
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snd_soc_write(codec, AK4535_MODE2, mode2);
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static int ak4535_set_dai_fmt(struct snd_soc_dai *codec_dai,
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struct snd_soc_codec *codec = codec_dai->codec;
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/* interface format */
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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case SND_SOC_DAIFMT_LEFT_J:
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/* use 32 fs for BCLK to save power */
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snd_soc_write(codec, AK4535_MODE1, mode1);
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static int ak4535_mute(struct snd_soc_dai *dai, int mute)
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struct snd_soc_codec *codec = dai->codec;
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u16 mute_reg = snd_soc_read(codec, AK4535_DAC);
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snd_soc_write(codec, AK4535_DAC, mute_reg & ~0x20);
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snd_soc_write(codec, AK4535_DAC, mute_reg | 0x20);
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static int ak4535_set_bias_level(struct snd_soc_codec *codec,
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enum snd_soc_bias_level level)
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case SND_SOC_BIAS_ON:
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snd_soc_update_bits(codec, AK4535_DAC, 0x20, 0);
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case SND_SOC_BIAS_PREPARE:
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snd_soc_update_bits(codec, AK4535_DAC, 0x20, 0x20);
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case SND_SOC_BIAS_STANDBY:
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snd_soc_update_bits(codec, AK4535_PM1, 0x80, 0x80);
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snd_soc_update_bits(codec, AK4535_PM2, 0x80, 0);
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case SND_SOC_BIAS_OFF:
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snd_soc_update_bits(codec, AK4535_PM1, 0x80, 0);
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codec->dapm.bias_level = level;
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#define AK4535_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
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SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000)
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static struct snd_soc_dai_ops ak4535_dai_ops = {
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.hw_params = ak4535_hw_params,
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.set_fmt = ak4535_set_dai_fmt,
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.digital_mute = ak4535_mute,
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.set_sysclk = ak4535_set_dai_sysclk,
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static struct snd_soc_dai_driver ak4535_dai = {
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.name = "ak4535-hifi",
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.stream_name = "Playback",
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.rates = AK4535_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.stream_name = "Capture",
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.rates = AK4535_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.ops = &ak4535_dai_ops,
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static int ak4535_suspend(struct snd_soc_codec *codec, pm_message_t state)
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ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
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static int ak4535_resume(struct snd_soc_codec *codec)
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snd_soc_cache_sync(codec);
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ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
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static int ak4535_probe(struct snd_soc_codec *codec)
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struct ak4535_priv *ak4535 = snd_soc_codec_get_drvdata(codec);
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printk(KERN_INFO "AK4535 Audio Codec %s", AK4535_VERSION);
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ret = snd_soc_codec_set_cache_io(codec, 8, 8, ak4535->control_type);
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dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
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/* power on device */
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ak4535_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
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snd_soc_add_controls(codec, ak4535_snd_controls,
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ARRAY_SIZE(ak4535_snd_controls));
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/* power down chip */
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static int ak4535_remove(struct snd_soc_codec *codec)
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ak4535_set_bias_level(codec, SND_SOC_BIAS_OFF);
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static struct snd_soc_codec_driver soc_codec_dev_ak4535 = {
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.probe = ak4535_probe,
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.remove = ak4535_remove,
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.suspend = ak4535_suspend,
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.resume = ak4535_resume,
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.set_bias_level = ak4535_set_bias_level,
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.reg_cache_size = ARRAY_SIZE(ak4535_reg),
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.reg_word_size = sizeof(u8),
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.reg_cache_default = ak4535_reg,
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.dapm_widgets = ak4535_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(ak4535_dapm_widgets),
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.dapm_routes = ak4535_audio_map,
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.num_dapm_routes = ARRAY_SIZE(ak4535_audio_map),
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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static __devinit int ak4535_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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struct ak4535_priv *ak4535;
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ak4535 = kzalloc(sizeof(struct ak4535_priv), GFP_KERNEL);
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i2c_set_clientdata(i2c, ak4535);
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ak4535->control_type = SND_SOC_I2C;
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ret = snd_soc_register_codec(&i2c->dev,
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&soc_codec_dev_ak4535, &ak4535_dai, 1);
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static __devexit int ak4535_i2c_remove(struct i2c_client *client)
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snd_soc_unregister_codec(&client->dev);
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kfree(i2c_get_clientdata(client));
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static const struct i2c_device_id ak4535_i2c_id[] = {
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MODULE_DEVICE_TABLE(i2c, ak4535_i2c_id);
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static struct i2c_driver ak4535_i2c_driver = {
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.name = "ak4535-codec",
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.owner = THIS_MODULE,
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.probe = ak4535_i2c_probe,
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.remove = __devexit_p(ak4535_i2c_remove),
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.id_table = ak4535_i2c_id,
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static int __init ak4535_modinit(void)
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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ret = i2c_add_driver(&ak4535_i2c_driver);
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printk(KERN_ERR "Failed to register AK4535 I2C driver: %d\n",
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module_init(ak4535_modinit);
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static void __exit ak4535_exit(void)
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#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
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i2c_del_driver(&ak4535_i2c_driver);
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module_exit(ak4535_exit);
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MODULE_DESCRIPTION("Soc AK4535 driver");
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MODULE_AUTHOR("Richard Purdie");
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MODULE_LICENSE("GPL");