682 lines
17 KiB
C
682 lines
17 KiB
C
/*
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* File: sound/soc/codecs/ad1938.c
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* Author: Barry Song <Barry.Song@analog.com>
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*
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* Created: June 04 2009
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* Description: Driver for AD1938 sound chip
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*
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* Modified:
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* Copyright 2009 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.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/initval.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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#include <sound/soc-dapm.h>
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#include <linux/spi/spi.h>
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#include "ad1938.h"
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/* codec private data */
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struct ad1938_priv {
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struct snd_soc_codec codec;
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u8 reg_cache[AD1938_NUM_REGS];
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};
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static struct snd_soc_codec *ad1938_codec;
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struct snd_soc_codec_device soc_codec_dev_ad1938;
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static int ad1938_register(struct ad1938_priv *ad1938);
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static void ad1938_unregister(struct ad1938_priv *ad1938);
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/*
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* AD1938 volume/mute/de-emphasis etc. controls
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*/
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static const char *ad1938_deemp[] = {"None", "48kHz", "44.1kHz", "32kHz"};
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static const struct soc_enum ad1938_deemp_enum =
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SOC_ENUM_SINGLE(AD1938_DAC_CTRL2, 1, 4, ad1938_deemp);
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static const struct snd_kcontrol_new ad1938_snd_controls[] = {
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/* DAC volume control */
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SOC_DOUBLE_R("DAC1 Volume", AD1938_DAC_L1_VOL,
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AD1938_DAC_R1_VOL, 0, 0xFF, 1),
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SOC_DOUBLE_R("DAC2 Volume", AD1938_DAC_L2_VOL,
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AD1938_DAC_R2_VOL, 0, 0xFF, 1),
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SOC_DOUBLE_R("DAC3 Volume", AD1938_DAC_L3_VOL,
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AD1938_DAC_R3_VOL, 0, 0xFF, 1),
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SOC_DOUBLE_R("DAC4 Volume", AD1938_DAC_L4_VOL,
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AD1938_DAC_R4_VOL, 0, 0xFF, 1),
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/* ADC switch control */
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SOC_DOUBLE("ADC1 Switch", AD1938_ADC_CTRL0, AD1938_ADCL1_MUTE,
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AD1938_ADCR1_MUTE, 1, 1),
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SOC_DOUBLE("ADC2 Switch", AD1938_ADC_CTRL0, AD1938_ADCL2_MUTE,
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AD1938_ADCR2_MUTE, 1, 1),
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/* DAC switch control */
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SOC_DOUBLE("DAC1 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL1_MUTE,
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AD1938_DACR1_MUTE, 1, 1),
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SOC_DOUBLE("DAC2 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL2_MUTE,
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AD1938_DACR2_MUTE, 1, 1),
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SOC_DOUBLE("DAC3 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL3_MUTE,
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AD1938_DACR3_MUTE, 1, 1),
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SOC_DOUBLE("DAC4 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL4_MUTE,
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AD1938_DACR4_MUTE, 1, 1),
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/* ADC high-pass filter */
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SOC_SINGLE("ADC High Pass Filter Switch", AD1938_ADC_CTRL0,
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AD1938_ADC_HIGHPASS_FILTER, 1, 0),
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/* DAC de-emphasis */
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SOC_ENUM("Playback Deemphasis", ad1938_deemp_enum),
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};
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static const struct snd_soc_dapm_widget ad1938_dapm_widgets[] = {
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SND_SOC_DAPM_DAC("DAC", "Playback", AD1938_DAC_CTRL0, 0, 1),
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SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1938_ADC_CTRL0, 0, 1, NULL, 0),
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SND_SOC_DAPM_OUTPUT("DAC1OUT"),
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SND_SOC_DAPM_OUTPUT("DAC2OUT"),
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SND_SOC_DAPM_OUTPUT("DAC3OUT"),
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SND_SOC_DAPM_OUTPUT("DAC4OUT"),
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SND_SOC_DAPM_INPUT("ADC1IN"),
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SND_SOC_DAPM_INPUT("ADC2IN"),
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};
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static const struct snd_soc_dapm_route audio_paths[] = {
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{ "DAC", NULL, "ADC_PWR" },
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{ "ADC", NULL, "ADC_PWR" },
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{ "DAC1OUT", "DAC1 Switch", "DAC" },
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{ "DAC2OUT", "DAC2 Switch", "DAC" },
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{ "DAC3OUT", "DAC3 Switch", "DAC" },
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{ "DAC4OUT", "DAC4 Switch", "DAC" },
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{ "ADC", "ADC1 Switch", "ADC1IN" },
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{ "ADC", "ADC2 Switch", "ADC2IN" },
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};
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/*
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* DAI ops entries
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*/
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static int ad1938_mute(struct snd_soc_dai *dai, int mute)
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{
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struct snd_soc_codec *codec = dai->codec;
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int reg;
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reg = codec->read(codec, AD1938_DAC_CTRL2);
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reg = (mute > 0) ? reg | AD1938_DAC_MASTER_MUTE : reg &
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(~AD1938_DAC_MASTER_MUTE);
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codec->write(codec, AD1938_DAC_CTRL2, reg);
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return 0;
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}
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static inline int ad1938_pll_powerctrl(struct snd_soc_codec *codec, int cmd)
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{
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int reg = codec->read(codec, AD1938_PLL_CLK_CTRL0);
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reg = (cmd > 0) ? reg & (~AD1938_PLL_POWERDOWN) : reg |
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AD1938_PLL_POWERDOWN;
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codec->write(codec, AD1938_PLL_CLK_CTRL0, reg);
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return 0;
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}
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static int ad1938_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
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unsigned int mask, int slots, int width)
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{
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struct snd_soc_codec *codec = dai->codec;
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int dac_reg = codec->read(codec, AD1938_DAC_CTRL1);
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int adc_reg = codec->read(codec, AD1938_ADC_CTRL2);
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dac_reg &= ~AD1938_DAC_CHAN_MASK;
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adc_reg &= ~AD1938_ADC_CHAN_MASK;
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switch (slots) {
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case 2:
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dac_reg |= AD1938_DAC_2_CHANNELS << AD1938_DAC_CHAN_SHFT;
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adc_reg |= AD1938_ADC_2_CHANNELS << AD1938_ADC_CHAN_SHFT;
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break;
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case 4:
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dac_reg |= AD1938_DAC_4_CHANNELS << AD1938_DAC_CHAN_SHFT;
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adc_reg |= AD1938_ADC_4_CHANNELS << AD1938_ADC_CHAN_SHFT;
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break;
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case 8:
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dac_reg |= AD1938_DAC_8_CHANNELS << AD1938_DAC_CHAN_SHFT;
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adc_reg |= AD1938_ADC_8_CHANNELS << AD1938_ADC_CHAN_SHFT;
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break;
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case 16:
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dac_reg |= AD1938_DAC_16_CHANNELS << AD1938_DAC_CHAN_SHFT;
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adc_reg |= AD1938_ADC_16_CHANNELS << AD1938_ADC_CHAN_SHFT;
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break;
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default:
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return -EINVAL;
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}
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codec->write(codec, AD1938_DAC_CTRL1, dac_reg);
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codec->write(codec, AD1938_ADC_CTRL2, adc_reg);
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return 0;
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}
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static int ad1938_set_dai_fmt(struct snd_soc_dai *codec_dai,
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unsigned int fmt)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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int adc_reg, dac_reg;
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adc_reg = codec->read(codec, AD1938_ADC_CTRL2);
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dac_reg = codec->read(codec, AD1938_DAC_CTRL1);
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/* At present, the driver only support AUX ADC mode(SND_SOC_DAIFMT_I2S
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* with TDM) and ADC&DAC TDM mode(SND_SOC_DAIFMT_DSP_A)
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*/
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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adc_reg &= ~AD1938_ADC_SERFMT_MASK;
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adc_reg |= AD1938_ADC_SERFMT_TDM;
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break;
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case SND_SOC_DAIFMT_DSP_A:
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adc_reg &= ~AD1938_ADC_SERFMT_MASK;
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adc_reg |= AD1938_ADC_SERFMT_AUX;
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_NB_NF: /* normal bit clock + frame */
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adc_reg &= ~AD1938_ADC_LEFT_HIGH;
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adc_reg &= ~AD1938_ADC_BCLK_INV;
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dac_reg &= ~AD1938_DAC_LEFT_HIGH;
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dac_reg &= ~AD1938_DAC_BCLK_INV;
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break;
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case SND_SOC_DAIFMT_NB_IF: /* normal bclk + invert frm */
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adc_reg |= AD1938_ADC_LEFT_HIGH;
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adc_reg &= ~AD1938_ADC_BCLK_INV;
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dac_reg |= AD1938_DAC_LEFT_HIGH;
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dac_reg &= ~AD1938_DAC_BCLK_INV;
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break;
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case SND_SOC_DAIFMT_IB_NF: /* invert bclk + normal frm */
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adc_reg &= ~AD1938_ADC_LEFT_HIGH;
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adc_reg |= AD1938_ADC_BCLK_INV;
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dac_reg &= ~AD1938_DAC_LEFT_HIGH;
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dac_reg |= AD1938_DAC_BCLK_INV;
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break;
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case SND_SOC_DAIFMT_IB_IF: /* invert bclk + frm */
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adc_reg |= AD1938_ADC_LEFT_HIGH;
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adc_reg |= AD1938_ADC_BCLK_INV;
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dac_reg |= AD1938_DAC_LEFT_HIGH;
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dac_reg |= AD1938_DAC_BCLK_INV;
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBM_CFM: /* codec clk & frm master */
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adc_reg |= AD1938_ADC_LCR_MASTER;
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adc_reg |= AD1938_ADC_BCLK_MASTER;
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dac_reg |= AD1938_DAC_LCR_MASTER;
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dac_reg |= AD1938_DAC_BCLK_MASTER;
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break;
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case SND_SOC_DAIFMT_CBS_CFM: /* codec clk slave & frm master */
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adc_reg |= AD1938_ADC_LCR_MASTER;
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adc_reg &= ~AD1938_ADC_BCLK_MASTER;
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dac_reg |= AD1938_DAC_LCR_MASTER;
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dac_reg &= ~AD1938_DAC_BCLK_MASTER;
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break;
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case SND_SOC_DAIFMT_CBM_CFS: /* codec clk master & frame slave */
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adc_reg &= ~AD1938_ADC_LCR_MASTER;
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adc_reg |= AD1938_ADC_BCLK_MASTER;
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dac_reg &= ~AD1938_DAC_LCR_MASTER;
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dac_reg |= AD1938_DAC_BCLK_MASTER;
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break;
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case SND_SOC_DAIFMT_CBS_CFS: /* codec clk & frm slave */
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adc_reg &= ~AD1938_ADC_LCR_MASTER;
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adc_reg &= ~AD1938_ADC_BCLK_MASTER;
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dac_reg &= ~AD1938_DAC_LCR_MASTER;
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dac_reg &= ~AD1938_DAC_BCLK_MASTER;
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break;
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default:
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return -EINVAL;
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}
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codec->write(codec, AD1938_ADC_CTRL2, adc_reg);
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codec->write(codec, AD1938_DAC_CTRL1, dac_reg);
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return 0;
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}
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static int ad1938_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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{
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int word_len = 0, reg = 0;
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_device *socdev = rtd->socdev;
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struct snd_soc_codec *codec = socdev->card->codec;
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/* bit size */
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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word_len = 3;
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break;
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case SNDRV_PCM_FORMAT_S20_3LE:
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word_len = 1;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S32_LE:
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word_len = 0;
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break;
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}
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reg = codec->read(codec, AD1938_DAC_CTRL2);
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reg = (reg & (~AD1938_DAC_WORD_LEN_MASK)) | word_len;
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codec->write(codec, AD1938_DAC_CTRL2, reg);
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reg = codec->read(codec, AD1938_ADC_CTRL1);
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reg = (reg & (~AD1938_ADC_WORD_LEN_MASK)) | word_len;
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codec->write(codec, AD1938_ADC_CTRL1, reg);
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return 0;
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}
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static int ad1938_set_bias_level(struct snd_soc_codec *codec,
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enum snd_soc_bias_level level)
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{
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switch (level) {
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case SND_SOC_BIAS_ON:
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ad1938_pll_powerctrl(codec, 1);
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break;
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case SND_SOC_BIAS_PREPARE:
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break;
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case SND_SOC_BIAS_STANDBY:
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case SND_SOC_BIAS_OFF:
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ad1938_pll_powerctrl(codec, 0);
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break;
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}
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codec->bias_level = level;
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return 0;
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}
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/*
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* interface to read/write ad1938 register
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*/
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#define AD1938_SPI_ADDR 0x4
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#define AD1938_SPI_READ 0x1
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#define AD1938_SPI_BUFLEN 3
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/*
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* write to the ad1938 register space
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*/
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static int ad1938_write_reg(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int value)
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{
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u8 *reg_cache = codec->reg_cache;
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int ret = 0;
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if (value != reg_cache[reg]) {
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uint8_t buf[AD1938_SPI_BUFLEN];
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struct spi_transfer t = {
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.tx_buf = buf,
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.len = AD1938_SPI_BUFLEN,
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};
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struct spi_message m;
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buf[0] = AD1938_SPI_ADDR << 1;
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buf[1] = reg;
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buf[2] = value;
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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ret = spi_sync(codec->control_data, &m);
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if (ret == 0)
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reg_cache[reg] = value;
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}
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return ret;
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}
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/*
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* read from the ad1938 register space cache
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*/
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static unsigned int ad1938_read_reg_cache(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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u8 *reg_cache = codec->reg_cache;
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if (reg >= codec->reg_cache_size)
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return -EINVAL;
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return reg_cache[reg];
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}
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/*
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* read from the ad1938 register space
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*/
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static unsigned int ad1938_read_reg(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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char w_buf[AD1938_SPI_BUFLEN];
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char r_buf[AD1938_SPI_BUFLEN];
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int ret;
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struct spi_transfer t = {
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.tx_buf = w_buf,
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.rx_buf = r_buf,
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.len = AD1938_SPI_BUFLEN,
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};
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struct spi_message m;
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w_buf[0] = (AD1938_SPI_ADDR << 1) | AD1938_SPI_READ;
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w_buf[1] = reg;
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w_buf[2] = 0;
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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ret = spi_sync(codec->control_data, &m);
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if (ret == 0)
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return r_buf[2];
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else
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return -EIO;
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}
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static int ad1938_fill_cache(struct snd_soc_codec *codec)
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{
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int i;
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u8 *reg_cache = codec->reg_cache;
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struct spi_device *spi = codec->control_data;
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for (i = 0; i < codec->reg_cache_size; i++) {
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int ret = ad1938_read_reg(codec, i);
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if (ret == -EIO) {
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dev_err(&spi->dev, "AD1938 SPI read failure\n");
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return ret;
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}
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reg_cache[i] = ret;
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}
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return 0;
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}
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static int __devinit ad1938_spi_probe(struct spi_device *spi)
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{
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struct snd_soc_codec *codec;
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struct ad1938_priv *ad1938;
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ad1938 = kzalloc(sizeof(struct ad1938_priv), GFP_KERNEL);
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if (ad1938 == NULL)
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return -ENOMEM;
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codec = &ad1938->codec;
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codec->control_data = spi;
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codec->dev = &spi->dev;
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dev_set_drvdata(&spi->dev, ad1938);
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return ad1938_register(ad1938);
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}
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static int __devexit ad1938_spi_remove(struct spi_device *spi)
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{
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struct ad1938_priv *ad1938 = dev_get_drvdata(&spi->dev);
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ad1938_unregister(ad1938);
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return 0;
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}
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static struct spi_driver ad1938_spi_driver = {
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.driver = {
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.name = "ad1938",
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.owner = THIS_MODULE,
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},
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.probe = ad1938_spi_probe,
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.remove = __devexit_p(ad1938_spi_remove),
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};
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static struct snd_soc_dai_ops ad1938_dai_ops = {
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.hw_params = ad1938_hw_params,
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.digital_mute = ad1938_mute,
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.set_tdm_slot = ad1938_set_tdm_slot,
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.set_fmt = ad1938_set_dai_fmt,
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};
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/* codec DAI instance */
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struct snd_soc_dai ad1938_dai = {
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.name = "AD1938",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 2,
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.channels_max = 8,
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.rates = SNDRV_PCM_RATE_48000,
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.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
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},
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.capture = {
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.stream_name = "Capture",
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.channels_min = 2,
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.channels_max = 4,
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.rates = SNDRV_PCM_RATE_48000,
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.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
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},
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.ops = &ad1938_dai_ops,
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};
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EXPORT_SYMBOL_GPL(ad1938_dai);
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static int ad1938_register(struct ad1938_priv *ad1938)
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{
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int ret;
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struct snd_soc_codec *codec = &ad1938->codec;
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if (ad1938_codec) {
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dev_err(codec->dev, "Another ad1938 is registered\n");
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return -EINVAL;
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}
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|
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mutex_init(&codec->mutex);
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INIT_LIST_HEAD(&codec->dapm_widgets);
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INIT_LIST_HEAD(&codec->dapm_paths);
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codec->private_data = ad1938;
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codec->reg_cache = ad1938->reg_cache;
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codec->reg_cache_size = AD1938_NUM_REGS;
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codec->name = "AD1938";
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codec->owner = THIS_MODULE;
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codec->dai = &ad1938_dai;
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codec->num_dai = 1;
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codec->write = ad1938_write_reg;
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codec->read = ad1938_read_reg_cache;
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codec->set_bias_level = ad1938_set_bias_level;
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INIT_LIST_HEAD(&codec->dapm_widgets);
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INIT_LIST_HEAD(&codec->dapm_paths);
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ad1938_dai.dev = codec->dev;
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ad1938_codec = codec;
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/* default setting for ad1938 */
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/* unmute dac channels */
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codec->write(codec, AD1938_DAC_CHNL_MUTE, 0x0);
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/* de-emphasis: 48kHz, powedown dac */
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codec->write(codec, AD1938_DAC_CTRL2, 0x1A);
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/* powerdown dac, dac in tdm mode */
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codec->write(codec, AD1938_DAC_CTRL0, 0x41);
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/* high-pass filter enable */
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codec->write(codec, AD1938_ADC_CTRL0, 0x3);
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/* sata delay=1, adc aux mode */
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codec->write(codec, AD1938_ADC_CTRL1, 0x43);
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/* pll input: mclki/xi */
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codec->write(codec, AD1938_PLL_CLK_CTRL0, 0x9D);
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codec->write(codec, AD1938_PLL_CLK_CTRL1, 0x04);
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ad1938_fill_cache(codec);
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ret = snd_soc_register_codec(codec);
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if (ret != 0) {
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dev_err(codec->dev, "Failed to register codec: %d\n", ret);
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kfree(ad1938);
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return ret;
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}
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ret = snd_soc_register_dai(&ad1938_dai);
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if (ret != 0) {
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dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
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snd_soc_unregister_codec(codec);
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kfree(ad1938);
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return ret;
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}
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return 0;
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}
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|
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static void ad1938_unregister(struct ad1938_priv *ad1938)
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{
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ad1938_set_bias_level(&ad1938->codec, SND_SOC_BIAS_OFF);
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snd_soc_unregister_dai(&ad1938_dai);
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snd_soc_unregister_codec(&ad1938->codec);
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kfree(ad1938);
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ad1938_codec = NULL;
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}
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|
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static int ad1938_probe(struct platform_device *pdev)
|
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{
|
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_codec *codec;
|
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int ret = 0;
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|
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if (ad1938_codec == NULL) {
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dev_err(&pdev->dev, "Codec device not registered\n");
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return -ENODEV;
|
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}
|
|
|
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socdev->card->codec = ad1938_codec;
|
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codec = ad1938_codec;
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|
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/* register pcms */
|
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ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
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if (ret < 0) {
|
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dev_err(codec->dev, "failed to create pcms: %d\n", ret);
|
|
goto pcm_err;
|
|
}
|
|
|
|
snd_soc_add_controls(codec, ad1938_snd_controls,
|
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ARRAY_SIZE(ad1938_snd_controls));
|
|
snd_soc_dapm_new_controls(codec, ad1938_dapm_widgets,
|
|
ARRAY_SIZE(ad1938_dapm_widgets));
|
|
snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
|
|
snd_soc_dapm_new_widgets(codec);
|
|
|
|
ad1938_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
|
|
|
|
ret = snd_soc_init_card(socdev);
|
|
if (ret < 0) {
|
|
dev_err(codec->dev, "failed to register card: %d\n", ret);
|
|
goto card_err;
|
|
}
|
|
|
|
return ret;
|
|
|
|
card_err:
|
|
snd_soc_free_pcms(socdev);
|
|
snd_soc_dapm_free(socdev);
|
|
pcm_err:
|
|
return ret;
|
|
}
|
|
|
|
/* power down chip */
|
|
static int ad1938_remove(struct platform_device *pdev)
|
|
{
|
|
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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|
|
|
snd_soc_free_pcms(socdev);
|
|
snd_soc_dapm_free(socdev);
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|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
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static int ad1938_suspend(struct platform_device *pdev,
|
|
pm_message_t state)
|
|
{
|
|
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
|
|
struct snd_soc_codec *codec = socdev->card->codec;
|
|
|
|
ad1938_set_bias_level(codec, SND_SOC_BIAS_OFF);
|
|
return 0;
|
|
}
|
|
|
|
static int ad1938_resume(struct platform_device *pdev)
|
|
{
|
|
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
|
|
struct snd_soc_codec *codec = socdev->card->codec;
|
|
|
|
if (codec->suspend_bias_level == SND_SOC_BIAS_ON)
|
|
ad1938_set_bias_level(codec, SND_SOC_BIAS_ON);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define ad1938_suspend NULL
|
|
#define ad1938_resume NULL
|
|
#endif
|
|
|
|
struct snd_soc_codec_device soc_codec_dev_ad1938 = {
|
|
.probe = ad1938_probe,
|
|
.remove = ad1938_remove,
|
|
.suspend = ad1938_suspend,
|
|
.resume = ad1938_resume,
|
|
};
|
|
EXPORT_SYMBOL_GPL(soc_codec_dev_ad1938);
|
|
|
|
static int __init ad1938_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = spi_register_driver(&ad1938_spi_driver);
|
|
if (ret != 0) {
|
|
printk(KERN_ERR "Failed to register ad1938 SPI driver: %d\n",
|
|
ret);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
module_init(ad1938_init);
|
|
|
|
static void __exit ad1938_exit(void)
|
|
{
|
|
spi_unregister_driver(&ad1938_spi_driver);
|
|
}
|
|
module_exit(ad1938_exit);
|
|
|
|
MODULE_DESCRIPTION("ASoC ad1938 driver");
|
|
MODULE_AUTHOR("Barry Song ");
|
|
MODULE_LICENSE("GPL");
|