diff options
Diffstat (limited to 'ANDROID_3.4.5/sound/soc/codecs/cs4270.c')
| -rw-r--r-- | ANDROID_3.4.5/sound/soc/codecs/cs4270.c | 740 |
1 files changed, 0 insertions, 740 deletions
diff --git a/ANDROID_3.4.5/sound/soc/codecs/cs4270.c b/ANDROID_3.4.5/sound/soc/codecs/cs4270.c deleted file mode 100644 index 1d672f52..00000000 --- a/ANDROID_3.4.5/sound/soc/codecs/cs4270.c +++ /dev/null @@ -1,740 +0,0 @@ -/* - * CS4270 ALSA SoC (ASoC) codec driver - * - * Author: Timur Tabi <timur@freescale.com> - * - * Copyright 2007-2009 Freescale Semiconductor, Inc. This file is licensed - * under the terms of the GNU General Public License version 2. This - * program is licensed "as is" without any warranty of any kind, whether - * express or implied. - * - * This is an ASoC device driver for the Cirrus Logic CS4270 codec. - * - * Current features/limitations: - * - * - Software mode is supported. Stand-alone mode is not supported. - * - Only I2C is supported, not SPI - * - Support for master and slave mode - * - The machine driver's 'startup' function must call - * cs4270_set_dai_sysclk() with the value of MCLK. - * - Only I2S and left-justified modes are supported - * - Power management is supported - */ - -#include <linux/module.h> -#include <linux/slab.h> -#include <sound/core.h> -#include <sound/soc.h> -#include <sound/initval.h> -#include <linux/i2c.h> -#include <linux/delay.h> -#include <linux/regulator/consumer.h> - -/* - * The codec isn't really big-endian or little-endian, since the I2S - * interface requires data to be sent serially with the MSbit first. - * However, to support BE and LE I2S devices, we specify both here. That - * way, ALSA will always match the bit patterns. - */ -#define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ - SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \ - SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \ - SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \ - SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \ - SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE) - -/* CS4270 registers addresses */ -#define CS4270_CHIPID 0x01 /* Chip ID */ -#define CS4270_PWRCTL 0x02 /* Power Control */ -#define CS4270_MODE 0x03 /* Mode Control */ -#define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */ -#define CS4270_TRANS 0x05 /* Transition Control */ -#define CS4270_MUTE 0x06 /* Mute Control */ -#define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */ -#define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */ - -#define CS4270_FIRSTREG 0x01 -#define CS4270_LASTREG 0x08 -#define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1) -#define CS4270_I2C_INCR 0x80 - -/* Bit masks for the CS4270 registers */ -#define CS4270_CHIPID_ID 0xF0 -#define CS4270_CHIPID_REV 0x0F -#define CS4270_PWRCTL_FREEZE 0x80 -#define CS4270_PWRCTL_PDN_ADC 0x20 -#define CS4270_PWRCTL_PDN_DAC 0x02 -#define CS4270_PWRCTL_PDN 0x01 -#define CS4270_PWRCTL_PDN_ALL \ - (CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | CS4270_PWRCTL_PDN) -#define CS4270_MODE_SPEED_MASK 0x30 -#define CS4270_MODE_1X 0x00 -#define CS4270_MODE_2X 0x10 -#define CS4270_MODE_4X 0x20 -#define CS4270_MODE_SLAVE 0x30 -#define CS4270_MODE_DIV_MASK 0x0E -#define CS4270_MODE_DIV1 0x00 -#define CS4270_MODE_DIV15 0x02 -#define CS4270_MODE_DIV2 0x04 -#define CS4270_MODE_DIV3 0x06 -#define CS4270_MODE_DIV4 0x08 -#define CS4270_MODE_POPGUARD 0x01 -#define CS4270_FORMAT_FREEZE_A 0x80 -#define CS4270_FORMAT_FREEZE_B 0x40 -#define CS4270_FORMAT_LOOPBACK 0x20 -#define CS4270_FORMAT_DAC_MASK 0x18 -#define CS4270_FORMAT_DAC_LJ 0x00 -#define CS4270_FORMAT_DAC_I2S 0x08 -#define CS4270_FORMAT_DAC_RJ16 0x18 -#define CS4270_FORMAT_DAC_RJ24 0x10 -#define CS4270_FORMAT_ADC_MASK 0x01 -#define CS4270_FORMAT_ADC_LJ 0x00 -#define CS4270_FORMAT_ADC_I2S 0x01 -#define CS4270_TRANS_ONE_VOL 0x80 -#define CS4270_TRANS_SOFT 0x40 -#define CS4270_TRANS_ZERO 0x20 -#define CS4270_TRANS_INV_ADC_A 0x08 -#define CS4270_TRANS_INV_ADC_B 0x10 -#define CS4270_TRANS_INV_DAC_A 0x02 -#define CS4270_TRANS_INV_DAC_B 0x04 -#define CS4270_TRANS_DEEMPH 0x01 -#define CS4270_MUTE_AUTO 0x20 -#define CS4270_MUTE_ADC_A 0x08 -#define CS4270_MUTE_ADC_B 0x10 -#define CS4270_MUTE_POLARITY 0x04 -#define CS4270_MUTE_DAC_A 0x01 -#define CS4270_MUTE_DAC_B 0x02 - -/* Power-on default values for the registers - * - * This array contains the power-on default values of the registers, with the - * exception of the "CHIPID" register (01h). The lower four bits of that - * register contain the hardware revision, so it is treated as volatile. - * - * Also note that on the CS4270, the first readable register is 1, but ASoC - * assumes the first register is 0. Therfore, the array must have an entry for - * register 0, but we use cs4270_reg_is_readable() to tell ASoC that it can't - * be read. - */ -static const u8 cs4270_default_reg_cache[CS4270_LASTREG + 1] = { - 0x00, 0x00, 0x00, 0x30, 0x00, 0x60, 0x20, 0x00, 0x00 -}; - -static const char *supply_names[] = { - "va", "vd", "vlc" -}; - -/* Private data for the CS4270 */ -struct cs4270_private { - enum snd_soc_control_type control_type; - unsigned int mclk; /* Input frequency of the MCLK pin */ - unsigned int mode; /* The mode (I2S or left-justified) */ - unsigned int slave_mode; - unsigned int manual_mute; - - /* power domain regulators */ - struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; -}; - -/** - * struct cs4270_mode_ratios - clock ratio tables - * @ratio: the ratio of MCLK to the sample rate - * @speed_mode: the Speed Mode bits to set in the Mode Control register for - * this ratio - * @mclk: the Ratio Select bits to set in the Mode Control register for this - * ratio - * - * The data for this chart is taken from Table 5 of the CS4270 reference - * manual. - * - * This table is used to determine how to program the Mode Control register. - * It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling - * rates the CS4270 currently supports. - * - * @speed_mode is the corresponding bit pattern to be written to the - * MODE bits of the Mode Control Register - * - * @mclk is the corresponding bit pattern to be wirten to the MCLK bits of - * the Mode Control Register. - * - * In situations where a single ratio is represented by multiple speed - * modes, we favor the slowest speed. E.g, for a ratio of 128, we pick - * double-speed instead of quad-speed. However, the CS4270 errata states - * that divide-By-1.5 can cause failures, so we avoid that mode where - * possible. - * - * Errata: There is an errata for the CS4270 where divide-by-1.5 does not - * work if Vd is 3.3V. If this effects you, select the - * CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will - * never select any sample rates that require divide-by-1.5. - */ -struct cs4270_mode_ratios { - unsigned int ratio; - u8 speed_mode; - u8 mclk; -}; - -static struct cs4270_mode_ratios cs4270_mode_ratios[] = { - {64, CS4270_MODE_4X, CS4270_MODE_DIV1}, -#ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA - {96, CS4270_MODE_4X, CS4270_MODE_DIV15}, -#endif - {128, CS4270_MODE_2X, CS4270_MODE_DIV1}, - {192, CS4270_MODE_4X, CS4270_MODE_DIV3}, - {256, CS4270_MODE_1X, CS4270_MODE_DIV1}, - {384, CS4270_MODE_2X, CS4270_MODE_DIV3}, - {512, CS4270_MODE_1X, CS4270_MODE_DIV2}, - {768, CS4270_MODE_1X, CS4270_MODE_DIV3}, - {1024, CS4270_MODE_1X, CS4270_MODE_DIV4} -}; - -/* The number of MCLK/LRCK ratios supported by the CS4270 */ -#define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios) - -static int cs4270_reg_is_readable(struct snd_soc_codec *codec, unsigned int reg) -{ - return (reg >= CS4270_FIRSTREG) && (reg <= CS4270_LASTREG); -} - -static int cs4270_reg_is_volatile(struct snd_soc_codec *codec, unsigned int reg) -{ - /* Unreadable registers are considered volatile */ - if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) - return 1; - - return reg == CS4270_CHIPID; -} - -/** - * cs4270_set_dai_sysclk - determine the CS4270 samples rates. - * @codec_dai: the codec DAI - * @clk_id: the clock ID (ignored) - * @freq: the MCLK input frequency - * @dir: the clock direction (ignored) - * - * This function is used to tell the codec driver what the input MCLK - * frequency is. - * - * The value of MCLK is used to determine which sample rates are supported - * by the CS4270. The ratio of MCLK / Fs must be equal to one of nine - * supported values - 64, 96, 128, 192, 256, 384, 512, 768, and 1024. - * - * This function calculates the nine ratios and determines which ones match - * a standard sample rate. If there's a match, then it is added to the list - * of supported sample rates. - * - * This function must be called by the machine driver's 'startup' function, - * otherwise the list of supported sample rates will not be available in - * time for ALSA. - * - * For setups with variable MCLKs, pass 0 as 'freq' argument. This will cause - * theoretically possible sample rates to be enabled. Call it again with a - * proper value set one the external clock is set (most probably you would do - * that from a machine's driver 'hw_param' hook. - */ -static int cs4270_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 cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - - cs4270->mclk = freq; - return 0; -} - -/** - * cs4270_set_dai_fmt - configure the codec for the selected audio format - * @codec_dai: the codec DAI - * @format: a SND_SOC_DAIFMT_x value indicating the data format - * - * This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the - * codec accordingly. - * - * Currently, this function only supports SND_SOC_DAIFMT_I2S and - * SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified - * data for playback only, but ASoC currently does not support different - * formats for playback vs. record. - */ -static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai, - unsigned int format) -{ - struct snd_soc_codec *codec = codec_dai->codec; - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - - /* set DAI format */ - switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { - case SND_SOC_DAIFMT_I2S: - case SND_SOC_DAIFMT_LEFT_J: - cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK; - break; - default: - dev_err(codec->dev, "invalid dai format\n"); - return -EINVAL; - } - - /* set master/slave audio interface */ - switch (format & SND_SOC_DAIFMT_MASTER_MASK) { - case SND_SOC_DAIFMT_CBS_CFS: - cs4270->slave_mode = 1; - break; - case SND_SOC_DAIFMT_CBM_CFM: - cs4270->slave_mode = 0; - break; - default: - /* all other modes are unsupported by the hardware */ - dev_err(codec->dev, "Unknown master/slave configuration\n"); - return -EINVAL; - } - - return 0; -} - -/** - * cs4270_hw_params - program the CS4270 with the given hardware parameters. - * @substream: the audio stream - * @params: the hardware parameters to set - * @dai: the SOC DAI (ignored) - * - * This function programs the hardware with the values provided. - * Specifically, the sample rate and the data format. - * - * The .ops functions are used to provide board-specific data, like input - * frequencies, to this driver. This function takes that information, - * combines it with the hardware parameters provided, and programs the - * hardware accordingly. - */ -static int cs4270_hw_params(struct snd_pcm_substream *substream, - struct snd_pcm_hw_params *params, - struct snd_soc_dai *dai) -{ - struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct snd_soc_codec *codec = rtd->codec; - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - int ret; - unsigned int i; - unsigned int rate; - unsigned int ratio; - int reg; - - /* Figure out which MCLK/LRCK ratio to use */ - - rate = params_rate(params); /* Sampling rate, in Hz */ - ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */ - - for (i = 0; i < NUM_MCLK_RATIOS; i++) { - if (cs4270_mode_ratios[i].ratio == ratio) - break; - } - - if (i == NUM_MCLK_RATIOS) { - /* We did not find a matching ratio */ - dev_err(codec->dev, "could not find matching ratio\n"); - return -EINVAL; - } - - /* Set the sample rate */ - - reg = snd_soc_read(codec, CS4270_MODE); - reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK); - reg |= cs4270_mode_ratios[i].mclk; - - if (cs4270->slave_mode) - reg |= CS4270_MODE_SLAVE; - else - reg |= cs4270_mode_ratios[i].speed_mode; - - ret = snd_soc_write(codec, CS4270_MODE, reg); - if (ret < 0) { - dev_err(codec->dev, "i2c write failed\n"); - return ret; - } - - /* Set the DAI format */ - - reg = snd_soc_read(codec, CS4270_FORMAT); - reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK); - - switch (cs4270->mode) { - case SND_SOC_DAIFMT_I2S: - reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S; - break; - case SND_SOC_DAIFMT_LEFT_J: - reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ; - break; - default: - dev_err(codec->dev, "unknown dai format\n"); - return -EINVAL; - } - - ret = snd_soc_write(codec, CS4270_FORMAT, reg); - if (ret < 0) { - dev_err(codec->dev, "i2c write failed\n"); - return ret; - } - - return ret; -} - -/** - * cs4270_dai_mute - enable/disable the CS4270 external mute - * @dai: the SOC DAI - * @mute: 0 = disable mute, 1 = enable mute - * - * This function toggles the mute bits in the MUTE register. The CS4270's - * mute capability is intended for external muting circuitry, so if the - * board does not have the MUTEA or MUTEB pins connected to such circuitry, - * then this function will do nothing. - */ -static int cs4270_dai_mute(struct snd_soc_dai *dai, int mute) -{ - struct snd_soc_codec *codec = dai->codec; - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - int reg6; - - reg6 = snd_soc_read(codec, CS4270_MUTE); - - if (mute) - reg6 |= CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B; - else { - reg6 &= ~(CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B); - reg6 |= cs4270->manual_mute; - } - - return snd_soc_write(codec, CS4270_MUTE, reg6); -} - -/** - * cs4270_soc_put_mute - put callback for the 'Master Playback switch' - * alsa control. - * @kcontrol: mixer control - * @ucontrol: control element information - * - * This function basically passes the arguments on to the generic - * snd_soc_put_volsw() function and saves the mute information in - * our private data structure. This is because we want to prevent - * cs4270_dai_mute() neglecting the user's decision to manually - * mute the codec's output. - * - * Returns 0 for success. - */ -static int cs4270_soc_put_mute(struct snd_kcontrol *kcontrol, - struct snd_ctl_elem_value *ucontrol) -{ - struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol); - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - int left = !ucontrol->value.integer.value[0]; - int right = !ucontrol->value.integer.value[1]; - - cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) | - (right ? CS4270_MUTE_DAC_B : 0); - - return snd_soc_put_volsw(kcontrol, ucontrol); -} - -/* A list of non-DAPM controls that the CS4270 supports */ -static const struct snd_kcontrol_new cs4270_snd_controls[] = { - SOC_DOUBLE_R("Master Playback Volume", - CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 1), - SOC_SINGLE("Digital Sidetone Switch", CS4270_FORMAT, 5, 1, 0), - SOC_SINGLE("Soft Ramp Switch", CS4270_TRANS, 6, 1, 0), - SOC_SINGLE("Zero Cross Switch", CS4270_TRANS, 5, 1, 0), - SOC_SINGLE("De-emphasis filter", CS4270_TRANS, 0, 1, 0), - SOC_SINGLE("Popguard Switch", CS4270_MODE, 0, 1, 1), - SOC_SINGLE("Auto-Mute Switch", CS4270_MUTE, 5, 1, 0), - SOC_DOUBLE("Master Capture Switch", CS4270_MUTE, 3, 4, 1, 1), - SOC_DOUBLE_EXT("Master Playback Switch", CS4270_MUTE, 0, 1, 1, 1, - snd_soc_get_volsw, cs4270_soc_put_mute), -}; - -static const struct snd_soc_dai_ops cs4270_dai_ops = { - .hw_params = cs4270_hw_params, - .set_sysclk = cs4270_set_dai_sysclk, - .set_fmt = cs4270_set_dai_fmt, - .digital_mute = cs4270_dai_mute, -}; - -static struct snd_soc_dai_driver cs4270_dai = { - .name = "cs4270-hifi", - .playback = { - .stream_name = "Playback", - .channels_min = 1, - .channels_max = 2, - .rates = SNDRV_PCM_RATE_CONTINUOUS, - .rate_min = 4000, - .rate_max = 216000, - .formats = CS4270_FORMATS, - }, - .capture = { - .stream_name = "Capture", - .channels_min = 1, - .channels_max = 2, - .rates = SNDRV_PCM_RATE_CONTINUOUS, - .rate_min = 4000, - .rate_max = 216000, - .formats = CS4270_FORMATS, - }, - .ops = &cs4270_dai_ops, -}; - -/** - * cs4270_probe - ASoC probe function - * @pdev: platform device - * - * This function is called when ASoC has all the pieces it needs to - * instantiate a sound driver. - */ -static int cs4270_probe(struct snd_soc_codec *codec) -{ - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - int i, ret; - - /* Tell ASoC what kind of I/O to use to read the registers. ASoC will - * then do the I2C transactions itself. - */ - ret = snd_soc_codec_set_cache_io(codec, 8, 8, cs4270->control_type); - if (ret < 0) { - dev_err(codec->dev, "failed to set cache I/O (ret=%i)\n", ret); - return ret; - } - - /* Disable auto-mute. This feature appears to be buggy. In some - * situations, auto-mute will not deactivate when it should, so we want - * this feature disabled by default. An application (e.g. alsactl) can - * re-enabled it by using the controls. - */ - ret = snd_soc_update_bits(codec, CS4270_MUTE, CS4270_MUTE_AUTO, 0); - if (ret < 0) { - dev_err(codec->dev, "i2c write failed\n"); - return ret; - } - - /* Disable automatic volume control. The hardware enables, and it - * causes volume change commands to be delayed, sometimes until after - * playback has started. An application (e.g. alsactl) can - * re-enabled it by using the controls. - */ - ret = snd_soc_update_bits(codec, CS4270_TRANS, - CS4270_TRANS_SOFT | CS4270_TRANS_ZERO, 0); - if (ret < 0) { - dev_err(codec->dev, "i2c write failed\n"); - return ret; - } - - /* Add the non-DAPM controls */ - ret = snd_soc_add_codec_controls(codec, cs4270_snd_controls, - ARRAY_SIZE(cs4270_snd_controls)); - if (ret < 0) { - dev_err(codec->dev, "failed to add controls\n"); - return ret; - } - - /* get the power supply regulators */ - for (i = 0; i < ARRAY_SIZE(supply_names); i++) - cs4270->supplies[i].supply = supply_names[i]; - - ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(cs4270->supplies), - cs4270->supplies); - if (ret < 0) - return ret; - - ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), - cs4270->supplies); - if (ret < 0) - goto error_free_regulators; - - return 0; - -error_free_regulators: - regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), - cs4270->supplies); - - return ret; -} - -/** - * cs4270_remove - ASoC remove function - * @pdev: platform device - * - * This function is the counterpart to cs4270_probe(). - */ -static int cs4270_remove(struct snd_soc_codec *codec) -{ - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - - regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); - regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); - - return 0; -}; - -#ifdef CONFIG_PM - -/* This suspend/resume implementation can handle both - a simple standby - * where the codec remains powered, and a full suspend, where the voltage - * domain the codec is connected to is teared down and/or any other hardware - * reset condition is asserted. - * - * The codec's own power saving features are enabled in the suspend callback, - * and all registers are written back to the hardware when resuming. - */ - -static int cs4270_soc_suspend(struct snd_soc_codec *codec) -{ - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - int reg, ret; - - reg = snd_soc_read(codec, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL; - if (reg < 0) - return reg; - - ret = snd_soc_write(codec, CS4270_PWRCTL, reg); - if (ret < 0) - return ret; - - regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), - cs4270->supplies); - - return 0; -} - -static int cs4270_soc_resume(struct snd_soc_codec *codec) -{ - struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec); - int reg; - - regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), - cs4270->supplies); - - /* In case the device was put to hard reset during sleep, we need to - * wait 500ns here before any I2C communication. */ - ndelay(500); - - /* first restore the entire register cache ... */ - snd_soc_cache_sync(codec); - - /* ... then disable the power-down bits */ - reg = snd_soc_read(codec, CS4270_PWRCTL); - reg &= ~CS4270_PWRCTL_PDN_ALL; - - return snd_soc_write(codec, CS4270_PWRCTL, reg); -} -#else -#define cs4270_soc_suspend NULL -#define cs4270_soc_resume NULL -#endif /* CONFIG_PM */ - -/* - * ASoC codec driver structure - */ -static const struct snd_soc_codec_driver soc_codec_device_cs4270 = { - .probe = cs4270_probe, - .remove = cs4270_remove, - .suspend = cs4270_soc_suspend, - .resume = cs4270_soc_resume, - .volatile_register = cs4270_reg_is_volatile, - .readable_register = cs4270_reg_is_readable, - .reg_cache_size = CS4270_LASTREG + 1, - .reg_word_size = sizeof(u8), - .reg_cache_default = cs4270_default_reg_cache, -}; - -/** - * cs4270_i2c_probe - initialize the I2C interface of the CS4270 - * @i2c_client: the I2C client object - * @id: the I2C device ID (ignored) - * - * This function is called whenever the I2C subsystem finds a device that - * matches the device ID given via a prior call to i2c_add_driver(). - */ -static int cs4270_i2c_probe(struct i2c_client *i2c_client, - const struct i2c_device_id *id) -{ - struct cs4270_private *cs4270; - int ret; - - /* Verify that we have a CS4270 */ - - ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID); - if (ret < 0) { - dev_err(&i2c_client->dev, "failed to read i2c at addr %X\n", - i2c_client->addr); - return ret; - } - /* The top four bits of the chip ID should be 1100. */ - if ((ret & 0xF0) != 0xC0) { - dev_err(&i2c_client->dev, "device at addr %X is not a CS4270\n", - i2c_client->addr); - return -ENODEV; - } - - dev_info(&i2c_client->dev, "found device at i2c address %X\n", - i2c_client->addr); - dev_info(&i2c_client->dev, "hardware revision %X\n", ret & 0xF); - - cs4270 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs4270_private), - GFP_KERNEL); - if (!cs4270) { - dev_err(&i2c_client->dev, "could not allocate codec\n"); - return -ENOMEM; - } - - i2c_set_clientdata(i2c_client, cs4270); - cs4270->control_type = SND_SOC_I2C; - - ret = snd_soc_register_codec(&i2c_client->dev, - &soc_codec_device_cs4270, &cs4270_dai, 1); - return ret; -} - -/** - * cs4270_i2c_remove - remove an I2C device - * @i2c_client: the I2C client object - * - * This function is the counterpart to cs4270_i2c_probe(). - */ -static int cs4270_i2c_remove(struct i2c_client *i2c_client) -{ - snd_soc_unregister_codec(&i2c_client->dev); - return 0; -} - -/* - * cs4270_id - I2C device IDs supported by this driver - */ -static const struct i2c_device_id cs4270_id[] = { - {"cs4270", 0}, - {} -}; -MODULE_DEVICE_TABLE(i2c, cs4270_id); - -/* - * cs4270_i2c_driver - I2C device identification - * - * This structure tells the I2C subsystem how to identify and support a - * given I2C device type. - */ -static struct i2c_driver cs4270_i2c_driver = { - .driver = { - .name = "cs4270", - .owner = THIS_MODULE, - }, - .id_table = cs4270_id, - .probe = cs4270_i2c_probe, - .remove = cs4270_i2c_remove, -}; - -static int __init cs4270_init(void) -{ - return i2c_add_driver(&cs4270_i2c_driver); -} -module_init(cs4270_init); - -static void __exit cs4270_exit(void) -{ - i2c_del_driver(&cs4270_i2c_driver); -} -module_exit(cs4270_exit); - -MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); -MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); -MODULE_LICENSE("GPL"); |