diff options
Diffstat (limited to 'sound/soc/codecs/ad1938.c')
| -rw-r--r-- | sound/soc/codecs/ad1938.c | 682 |
1 files changed, 682 insertions, 0 deletions
diff --git a/sound/soc/codecs/ad1938.c b/sound/soc/codecs/ad1938.c new file mode 100644 index 0000000..e62b277 --- /dev/null +++ b/sound/soc/codecs/ad1938.c @@ -0,0 +1,682 @@ +/* + * File: sound/soc/codecs/ad1938.c + * Author: Barry Song <Barry.Song@analog.com> + * + * Created: June 04 2009 + * Description: Driver for AD1938 sound chip + * + * Modified: + * Copyright 2009 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/version.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/initval.h> +#include <sound/soc.h> +#include <sound/tlv.h> +#include <sound/soc-dapm.h> +#include <linux/spi/spi.h> +#include "ad1938.h" + +/* codec private data */ +struct ad1938_priv { + struct snd_soc_codec codec; + u8 reg_cache[AD1938_NUM_REGS]; +}; + +static struct snd_soc_codec *ad1938_codec; +struct snd_soc_codec_device soc_codec_dev_ad1938; +static int ad1938_register(struct ad1938_priv *ad1938); +static void ad1938_unregister(struct ad1938_priv *ad1938); + +/* + * AD1938 volume/mute/de-emphasis etc. controls + */ +static const char *ad1938_deemp[] = {"None", "48kHz", "44.1kHz", "32kHz"}; + +static const struct soc_enum ad1938_deemp_enum = + SOC_ENUM_SINGLE(AD1938_DAC_CTRL2, 1, 4, ad1938_deemp); + +static const struct snd_kcontrol_new ad1938_snd_controls[] = { + /* DAC volume control */ + SOC_DOUBLE_R("DAC1 Volume", AD1938_DAC_L1_VOL, + AD1938_DAC_R1_VOL, 0, 0xFF, 1), + SOC_DOUBLE_R("DAC2 Volume", AD1938_DAC_L2_VOL, + AD1938_DAC_R2_VOL, 0, 0xFF, 1), + SOC_DOUBLE_R("DAC3 Volume", AD1938_DAC_L3_VOL, + AD1938_DAC_R3_VOL, 0, 0xFF, 1), + SOC_DOUBLE_R("DAC4 Volume", AD1938_DAC_L4_VOL, + AD1938_DAC_R4_VOL, 0, 0xFF, 1), + + /* ADC switch control */ + SOC_DOUBLE("ADC1 Switch", AD1938_ADC_CTRL0, AD1938_ADCL1_MUTE, + AD1938_ADCR1_MUTE, 1, 1), + SOC_DOUBLE("ADC2 Switch", AD1938_ADC_CTRL0, AD1938_ADCL2_MUTE, + AD1938_ADCR2_MUTE, 1, 1), + + /* DAC switch control */ + SOC_DOUBLE("DAC1 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL1_MUTE, + AD1938_DACR1_MUTE, 1, 1), + SOC_DOUBLE("DAC2 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL2_MUTE, + AD1938_DACR2_MUTE, 1, 1), + SOC_DOUBLE("DAC3 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL3_MUTE, + AD1938_DACR3_MUTE, 1, 1), + SOC_DOUBLE("DAC4 Switch", AD1938_DAC_CHNL_MUTE, AD1938_DACL4_MUTE, + AD1938_DACR4_MUTE, 1, 1), + + /* ADC high-pass filter */ + SOC_SINGLE("ADC High Pass Filter Switch", AD1938_ADC_CTRL0, + AD1938_ADC_HIGHPASS_FILTER, 1, 0), + + /* DAC de-emphasis */ + SOC_ENUM("Playback Deemphasis", ad1938_deemp_enum), +}; + +static const struct snd_soc_dapm_widget ad1938_dapm_widgets[] = { + SND_SOC_DAPM_DAC("DAC", "Playback", AD1938_DAC_CTRL0, 0, 1), + SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0), + SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1938_ADC_CTRL0, 0, 1, NULL, 0), + SND_SOC_DAPM_OUTPUT("DAC1OUT"), + SND_SOC_DAPM_OUTPUT("DAC2OUT"), + SND_SOC_DAPM_OUTPUT("DAC3OUT"), + SND_SOC_DAPM_OUTPUT("DAC4OUT"), + SND_SOC_DAPM_INPUT("ADC1IN"), + SND_SOC_DAPM_INPUT("ADC2IN"), +}; + +static const struct snd_soc_dapm_route audio_paths[] = { + { "DAC", NULL, "ADC_PWR" }, + { "ADC", NULL, "ADC_PWR" }, + { "DAC1OUT", "DAC1 Switch", "DAC" }, + { "DAC2OUT", "DAC2 Switch", "DAC" }, + { "DAC3OUT", "DAC3 Switch", "DAC" }, + { "DAC4OUT", "DAC4 Switch", "DAC" }, + { "ADC", "ADC1 Switch", "ADC1IN" }, + { "ADC", "ADC2 Switch", "ADC2IN" }, +}; + +/* + * DAI ops entries + */ + +static int ad1938_mute(struct snd_soc_dai *dai, int mute) +{ + struct snd_soc_codec *codec = dai->codec; + int reg; + + reg = codec->read(codec, AD1938_DAC_CTRL2); + reg = (mute > 0) ? reg | AD1938_DAC_MASTER_MUTE : reg & + (~AD1938_DAC_MASTER_MUTE); + codec->write(codec, AD1938_DAC_CTRL2, reg); + + return 0; +} + +static inline int ad1938_pll_powerctrl(struct snd_soc_codec *codec, int cmd) +{ + int reg = codec->read(codec, AD1938_PLL_CLK_CTRL0); + reg = (cmd > 0) ? reg & (~AD1938_PLL_POWERDOWN) : reg | + AD1938_PLL_POWERDOWN; + codec->write(codec, AD1938_PLL_CLK_CTRL0, reg); + + return 0; +} + +static int ad1938_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask, + unsigned int mask, int slots, int width) +{ + struct snd_soc_codec *codec = dai->codec; + int dac_reg = codec->read(codec, AD1938_DAC_CTRL1); + int adc_reg = codec->read(codec, AD1938_ADC_CTRL2); + + dac_reg &= ~AD1938_DAC_CHAN_MASK; + adc_reg &= ~AD1938_ADC_CHAN_MASK; + + switch (slots) { + case 2: + dac_reg |= AD1938_DAC_2_CHANNELS << AD1938_DAC_CHAN_SHFT; + adc_reg |= AD1938_ADC_2_CHANNELS << AD1938_ADC_CHAN_SHFT; + break; + case 4: + dac_reg |= AD1938_DAC_4_CHANNELS << AD1938_DAC_CHAN_SHFT; + adc_reg |= AD1938_ADC_4_CHANNELS << AD1938_ADC_CHAN_SHFT; + break; + case 8: + dac_reg |= AD1938_DAC_8_CHANNELS << AD1938_DAC_CHAN_SHFT; + adc_reg |= AD1938_ADC_8_CHANNELS << AD1938_ADC_CHAN_SHFT; + break; + case 16: + dac_reg |= AD1938_DAC_16_CHANNELS << AD1938_DAC_CHAN_SHFT; + adc_reg |= AD1938_ADC_16_CHANNELS << AD1938_ADC_CHAN_SHFT; + break; + default: + return -EINVAL; + } + + codec->write(codec, AD1938_DAC_CTRL1, dac_reg); + codec->write(codec, AD1938_ADC_CTRL2, adc_reg); + + return 0; +} + +static int ad1938_set_dai_fmt(struct snd_soc_dai *codec_dai, + unsigned int fmt) +{ + struct snd_soc_codec *codec = codec_dai->codec; + int adc_reg, dac_reg; + + adc_reg = codec->read(codec, AD1938_ADC_CTRL2); + dac_reg = codec->read(codec, AD1938_DAC_CTRL1); + + /* At present, the driver only support AUX ADC mode(SND_SOC_DAIFMT_I2S + * with TDM) and ADC&DAC TDM mode(SND_SOC_DAIFMT_DSP_A) + */ + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + adc_reg &= ~AD1938_ADC_SERFMT_MASK; + adc_reg |= AD1938_ADC_SERFMT_TDM; + break; + case SND_SOC_DAIFMT_DSP_A: + adc_reg &= ~AD1938_ADC_SERFMT_MASK; + adc_reg |= AD1938_ADC_SERFMT_AUX; + break; + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: /* normal bit clock + frame */ + adc_reg &= ~AD1938_ADC_LEFT_HIGH; + adc_reg &= ~AD1938_ADC_BCLK_INV; + dac_reg &= ~AD1938_DAC_LEFT_HIGH; + dac_reg &= ~AD1938_DAC_BCLK_INV; + break; + case SND_SOC_DAIFMT_NB_IF: /* normal bclk + invert frm */ + adc_reg |= AD1938_ADC_LEFT_HIGH; + adc_reg &= ~AD1938_ADC_BCLK_INV; + dac_reg |= AD1938_DAC_LEFT_HIGH; + dac_reg &= ~AD1938_DAC_BCLK_INV; + break; + case SND_SOC_DAIFMT_IB_NF: /* invert bclk + normal frm */ + adc_reg &= ~AD1938_ADC_LEFT_HIGH; + adc_reg |= AD1938_ADC_BCLK_INV; + dac_reg &= ~AD1938_DAC_LEFT_HIGH; + dac_reg |= AD1938_DAC_BCLK_INV; + break; + + case SND_SOC_DAIFMT_IB_IF: /* invert bclk + frm */ + adc_reg |= AD1938_ADC_LEFT_HIGH; + adc_reg |= AD1938_ADC_BCLK_INV; + dac_reg |= AD1938_DAC_LEFT_HIGH; + dac_reg |= AD1938_DAC_BCLK_INV; + break; + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: /* codec clk & frm master */ + adc_reg |= AD1938_ADC_LCR_MASTER; + adc_reg |= AD1938_ADC_BCLK_MASTER; + dac_reg |= AD1938_DAC_LCR_MASTER; + dac_reg |= AD1938_DAC_BCLK_MASTER; + break; + case SND_SOC_DAIFMT_CBS_CFM: /* codec clk slave & frm master */ + adc_reg |= AD1938_ADC_LCR_MASTER; + adc_reg &= ~AD1938_ADC_BCLK_MASTER; + dac_reg |= AD1938_DAC_LCR_MASTER; + dac_reg &= ~AD1938_DAC_BCLK_MASTER; + break; + case SND_SOC_DAIFMT_CBM_CFS: /* codec clk master & frame slave */ + adc_reg &= ~AD1938_ADC_LCR_MASTER; + adc_reg |= AD1938_ADC_BCLK_MASTER; + dac_reg &= ~AD1938_DAC_LCR_MASTER; + dac_reg |= AD1938_DAC_BCLK_MASTER; + break; + case SND_SOC_DAIFMT_CBS_CFS: /* codec clk & frm slave */ + adc_reg &= ~AD1938_ADC_LCR_MASTER; + adc_reg &= ~AD1938_ADC_BCLK_MASTER; + dac_reg &= ~AD1938_DAC_LCR_MASTER; + dac_reg &= ~AD1938_DAC_BCLK_MASTER; + break; + default: + return -EINVAL; + } + + codec->write(codec, AD1938_ADC_CTRL2, adc_reg); + codec->write(codec, AD1938_DAC_CTRL1, dac_reg); + + return 0; +} + +static int ad1938_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + int word_len = 0, reg = 0; + + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_device *socdev = rtd->socdev; + struct snd_soc_codec *codec = socdev->card->codec; + + /* bit size */ + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S16_LE: + word_len = 3; + break; + case SNDRV_PCM_FORMAT_S20_3LE: + word_len = 1; + break; + case SNDRV_PCM_FORMAT_S24_LE: + case SNDRV_PCM_FORMAT_S32_LE: + word_len = 0; + break; + } + + reg = codec->read(codec, AD1938_DAC_CTRL2); + reg = (reg & (~AD1938_DAC_WORD_LEN_MASK)) | word_len; + codec->write(codec, AD1938_DAC_CTRL2, reg); + + reg = codec->read(codec, AD1938_ADC_CTRL1); + reg = (reg & (~AD1938_ADC_WORD_LEN_MASK)) | word_len; + codec->write(codec, AD1938_ADC_CTRL1, reg); + + return 0; +} + +static int ad1938_set_bias_level(struct snd_soc_codec *codec, + enum snd_soc_bias_level level) +{ + switch (level) { + case SND_SOC_BIAS_ON: + ad1938_pll_powerctrl(codec, 1); + break; + case SND_SOC_BIAS_PREPARE: + break; + case SND_SOC_BIAS_STANDBY: + case SND_SOC_BIAS_OFF: + ad1938_pll_powerctrl(codec, 0); + break; + } + codec->bias_level = level; + return 0; +} + +/* + * interface to read/write ad1938 register + */ + +#define AD1938_SPI_ADDR 0x4 +#define AD1938_SPI_READ 0x1 +#define AD1938_SPI_BUFLEN 3 + +/* + * write to the ad1938 register space + */ + +static int ad1938_write_reg(struct snd_soc_codec *codec, unsigned int reg, + unsigned int value) +{ + u8 *reg_cache = codec->reg_cache; + int ret = 0; + + if (value != reg_cache[reg]) { + uint8_t buf[AD1938_SPI_BUFLEN]; + struct spi_transfer t = { + .tx_buf = buf, + .len = AD1938_SPI_BUFLEN, + }; + struct spi_message m; + + buf[0] = AD1938_SPI_ADDR << 1; + buf[1] = reg; + buf[2] = value; + spi_message_init(&m); + spi_message_add_tail(&t, &m); + ret = spi_sync(codec->control_data, &m); + if (ret == 0) + reg_cache[reg] = value; + } + + return ret; +} + +/* + * read from the ad1938 register space cache + */ + +static unsigned int ad1938_read_reg_cache(struct snd_soc_codec *codec, + unsigned int reg) +{ + u8 *reg_cache = codec->reg_cache; + + if (reg >= codec->reg_cache_size) + return -EINVAL; + + return reg_cache[reg]; +} + +/* + * read from the ad1938 register space + */ + +static unsigned int ad1938_read_reg(struct snd_soc_codec *codec, + unsigned int reg) +{ + char w_buf[AD1938_SPI_BUFLEN]; + char r_buf[AD1938_SPI_BUFLEN]; + int ret; + + struct spi_transfer t = { + .tx_buf = w_buf, + .rx_buf = r_buf, + .len = AD1938_SPI_BUFLEN, + }; + struct spi_message m; + + w_buf[0] = (AD1938_SPI_ADDR << 1) | AD1938_SPI_READ; + w_buf[1] = reg; + w_buf[2] = 0; + + spi_message_init(&m); + spi_message_add_tail(&t, &m); + ret = spi_sync(codec->control_data, &m); + if (ret == 0) + return r_buf[2]; + else + return -EIO; +} + +static int ad1938_fill_cache(struct snd_soc_codec *codec) +{ + int i; + u8 *reg_cache = codec->reg_cache; + struct spi_device *spi = codec->control_data; + + for (i = 0; i < codec->reg_cache_size; i++) { + int ret = ad1938_read_reg(codec, i); + if (ret == -EIO) { + dev_err(&spi->dev, "AD1938 SPI read failure\n"); + return ret; + } + reg_cache[i] = ret; + } + + return 0; +} + +static int __devinit ad1938_spi_probe(struct spi_device *spi) +{ + struct snd_soc_codec *codec; + struct ad1938_priv *ad1938; + + ad1938 = kzalloc(sizeof(struct ad1938_priv), GFP_KERNEL); + if (ad1938 == NULL) + return -ENOMEM; + + codec = &ad1938->codec; + codec->control_data = spi; + codec->dev = &spi->dev; + + dev_set_drvdata(&spi->dev, ad1938); + + return ad1938_register(ad1938); +} + +static int __devexit ad1938_spi_remove(struct spi_device *spi) +{ + struct ad1938_priv *ad1938 = dev_get_drvdata(&spi->dev); + + ad1938_unregister(ad1938); + return 0; +} + +static struct spi_driver ad1938_spi_driver = { + .driver = { + .name = "ad1938", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = ad1938_spi_probe, + .remove = __devexit_p(ad1938_spi_remove), +}; + +static struct snd_soc_dai_ops ad1938_dai_ops = { + .hw_params = ad1938_hw_params, + .digital_mute = ad1938_mute, + .set_tdm_slot = ad1938_set_tdm_slot, + .set_fmt = ad1938_set_dai_fmt, +}; + +/* codec DAI instance */ +struct snd_soc_dai ad1938_dai = { + .name = "AD1938", + .playback = { + .stream_name = "Playback", + .channels_min = 2, + .channels_max = 8, + .rates = SNDRV_PCM_RATE_48000, + .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE, + }, + .capture = { + .stream_name = "Capture", + .channels_min = 2, + .channels_max = 4, + .rates = SNDRV_PCM_RATE_48000, + .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE, + }, + .ops = &ad1938_dai_ops, +}; +EXPORT_SYMBOL_GPL(ad1938_dai); + +static int ad1938_register(struct ad1938_priv *ad1938) +{ + int ret; + struct snd_soc_codec *codec = &ad1938->codec; + + if (ad1938_codec) { + dev_err(codec->dev, "Another ad1938 is registered\n"); + return -EINVAL; + } + + mutex_init(&codec->mutex); + INIT_LIST_HEAD(&codec->dapm_widgets); + INIT_LIST_HEAD(&codec->dapm_paths); + codec->private_data = ad1938; + codec->reg_cache = ad1938->reg_cache; + codec->reg_cache_size = AD1938_NUM_REGS; + codec->name = "AD1938"; + codec->owner = THIS_MODULE; + codec->dai = &ad1938_dai; + codec->num_dai = 1; + codec->write = ad1938_write_reg; + codec->read = ad1938_read_reg_cache; + INIT_LIST_HEAD(&codec->dapm_widgets); + INIT_LIST_HEAD(&codec->dapm_paths); + + ad1938_dai.dev = codec->dev; + ad1938_codec = codec; + + /* default setting for ad1938 */ + + /* unmute dac channels */ + codec->write(codec, AD1938_DAC_CHNL_MUTE, 0x0); + /* de-emphasis: 48kHz, powedown dac */ + codec->write(codec, AD1938_DAC_CTRL2, 0x1A); + /* powerdown dac, dac in tdm mode */ + codec->write(codec, AD1938_DAC_CTRL0, 0x41); + /* high-pass filter enable */ + codec->write(codec, AD1938_ADC_CTRL0, 0x3); + /* sata delay=1, adc aux mode */ + codec->write(codec, AD1938_ADC_CTRL1, 0x43); + /* pll input: mclki/xi */ + codec->write(codec, AD1938_PLL_CLK_CTRL0, 0x9D); + codec->write(codec, AD1938_PLL_CLK_CTRL1, 0x04); + + ad1938_fill_cache(codec); + + ret = snd_soc_register_codec(codec); + if (ret != 0) { + dev_err(codec->dev, "Failed to register codec: %d\n", ret); + kfree(ad1938); + return ret; + } + + ret = snd_soc_register_dai(&ad1938_dai); + if (ret != 0) { + dev_err(codec->dev, "Failed to register DAI: %d\n", ret); + snd_soc_unregister_codec(codec); + kfree(ad1938); + return ret; + } + + return 0; +} + +static void ad1938_unregister(struct ad1938_priv *ad1938) +{ + ad1938_set_bias_level(&ad1938->codec, SND_SOC_BIAS_OFF); + snd_soc_unregister_dai(&ad1938_dai); + snd_soc_unregister_codec(&ad1938->codec); + kfree(ad1938); + ad1938_codec = NULL; +} + +static int ad1938_probe(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec; + int ret = 0; + + if (ad1938_codec == NULL) { + dev_err(&pdev->dev, "Codec device not registered\n"); + return -ENODEV; + } + + socdev->card->codec = ad1938_codec; + codec = ad1938_codec; + + /* register pcms */ + ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); + if (ret < 0) { + dev_err(codec->dev, "failed to create pcms: %d\n", ret); + goto pcm_err; + } + + snd_soc_add_controls(codec, ad1938_snd_controls, + 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); + + snd_soc_free_pcms(socdev); + snd_soc_dapm_free(socdev); + + return 0; +} + +#ifdef CONFIG_PM +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"); |
