| /* |
| * 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> |
| #include <linux/of_device.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_codec *codec = dai->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, ret; |
| |
| ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), |
| cs4270->supplies); |
| if (ret != 0) |
| return ret; |
| |
| /* 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_of_match - the device tree bindings |
| */ |
| static const struct of_device_id cs4270_of_match[] = { |
| { .compatible = "cirrus,cs4270", }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, cs4270_of_match); |
| |
| /** |
| * 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, |
| .of_match_table = cs4270_of_match, |
| }, |
| .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"); |