| /* |
| * 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: |
| * |
| * 1) Software mode is supported. Stand-alone mode is not supported. |
| * 2) Only I2C is supported, not SPI |
| * 3) Only Master mode is supported, not Slave. |
| * 4) The machine driver's 'startup' function must call |
| * cs4270_set_dai_sysclk() with the value of MCLK. |
| * 5) Only I2S and left-justified modes are supported |
| * 6) Power management is not supported |
| * 7) The only supported control is volume and hardware mute (if enabled) |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <sound/core.h> |
| #include <sound/soc.h> |
| #include <sound/initval.h> |
| #include <linux/i2c.h> |
| |
| #include "cs4270.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) |
| |
| /* 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_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 |
| |
| /* Private data for the CS4270 */ |
| struct cs4270_private { |
| struct snd_soc_codec codec; |
| u8 reg_cache[CS4270_NUMREGS]; |
| unsigned int mclk; /* Input frequency of the MCLK pin */ |
| unsigned int mode; /* The mode (I2S or left-justified) */ |
| unsigned int slave_mode; |
| }; |
| |
| /** |
| * 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) |
| |
| /** |
| * 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. |
| */ |
| 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 = codec->private_data; |
| unsigned int rates = 0; |
| unsigned int rate_min = -1; |
| unsigned int rate_max = 0; |
| unsigned int i; |
| |
| cs4270->mclk = freq; |
| |
| for (i = 0; i < NUM_MCLK_RATIOS; i++) { |
| unsigned int rate = freq / cs4270_mode_ratios[i].ratio; |
| rates |= snd_pcm_rate_to_rate_bit(rate); |
| if (rate < rate_min) |
| rate_min = rate; |
| if (rate > rate_max) |
| rate_max = rate; |
| } |
| /* FIXME: soc should support a rate list */ |
| rates &= ~SNDRV_PCM_RATE_KNOT; |
| |
| if (!rates) { |
| dev_err(codec->dev, "could not find a valid sample rate\n"); |
| return -EINVAL; |
| } |
| |
| codec_dai->playback.rates = rates; |
| codec_dai->playback.rate_min = rate_min; |
| codec_dai->playback.rate_max = rate_max; |
| |
| codec_dai->capture.rates = rates; |
| codec_dai->capture.rate_min = rate_min; |
| codec_dai->capture.rate_max = rate_max; |
| |
| 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 = codec->private_data; |
| int ret = 0; |
| |
| /* 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"); |
| ret = -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 */ |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| /** |
| * cs4270_fill_cache - pre-fill the CS4270 register cache. |
| * @codec: the codec for this CS4270 |
| * |
| * This function fills in the CS4270 register cache by reading the register |
| * values from the hardware. |
| * |
| * This CS4270 registers are cached to avoid excessive I2C I/O operations. |
| * After the initial read to pre-fill the cache, the CS4270 never updates |
| * the register values, so we won't have a cache coherency problem. |
| * |
| * We use the auto-increment feature of the CS4270 to read all registers in |
| * one shot. |
| */ |
| static int cs4270_fill_cache(struct snd_soc_codec *codec) |
| { |
| u8 *cache = codec->reg_cache; |
| struct i2c_client *i2c_client = codec->control_data; |
| s32 length; |
| |
| length = i2c_smbus_read_i2c_block_data(i2c_client, |
| CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache); |
| |
| if (length != CS4270_NUMREGS) { |
| dev_err(codec->dev, "i2c read failure, addr=0x%x\n", |
| i2c_client->addr); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * cs4270_read_reg_cache - read from the CS4270 register cache. |
| * @codec: the codec for this CS4270 |
| * @reg: the register to read |
| * |
| * This function returns the value for a given register. It reads only from |
| * the register cache, not the hardware itself. |
| * |
| * This CS4270 registers are cached to avoid excessive I2C I/O operations. |
| * After the initial read to pre-fill the cache, the CS4270 never updates |
| * the register values, so we won't have a cache coherency problem. |
| */ |
| static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec, |
| unsigned int reg) |
| { |
| u8 *cache = codec->reg_cache; |
| |
| if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) |
| return -EIO; |
| |
| return cache[reg - CS4270_FIRSTREG]; |
| } |
| |
| /** |
| * cs4270_i2c_write - write to a CS4270 register via the I2C bus. |
| * @codec: the codec for this CS4270 |
| * @reg: the register to write |
| * @value: the value to write to the register |
| * |
| * This function writes the given value to the given CS4270 register, and |
| * also updates the register cache. |
| * |
| * Note that we don't use the hw_write function pointer of snd_soc_codec. |
| * That's because it's too clunky: the hw_write_t prototype does not match |
| * i2c_smbus_write_byte_data(), and it's just another layer of overhead. |
| */ |
| static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg, |
| unsigned int value) |
| { |
| u8 *cache = codec->reg_cache; |
| |
| if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) |
| return -EIO; |
| |
| /* Only perform an I2C operation if the new value is different */ |
| if (cache[reg - CS4270_FIRSTREG] != value) { |
| struct i2c_client *client = codec->control_data; |
| if (i2c_smbus_write_byte_data(client, reg, value)) { |
| dev_err(codec->dev, "i2c write failed\n"); |
| return -EIO; |
| } |
| |
| /* We've written to the hardware, so update the cache */ |
| cache[reg - CS4270_FIRSTREG] = value; |
| } |
| |
| 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_device *socdev = rtd->socdev; |
| struct snd_soc_codec *codec = socdev->card->codec; |
| struct cs4270_private *cs4270 = codec->private_data; |
| 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_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_mute(struct snd_soc_dai *dai, int mute) |
| { |
| struct snd_soc_codec *codec = dai->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); |
| |
| return snd_soc_write(codec, CS4270_MUTE, reg6); |
| } |
| |
| /* 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("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, 0) |
| }; |
| |
| /* |
| * cs4270_codec - global variable to store codec for the ASoC probe function |
| * |
| * If struct i2c_driver had a private_data field, we wouldn't need to use |
| * cs4270_codec. This is the only way to pass the codec structure from |
| * cs4270_i2c_probe() to cs4270_probe(). Unfortunately, there is no good |
| * way to synchronize these two functions. cs4270_i2c_probe() can be called |
| * multiple times before cs4270_probe() is called even once. So for now, we |
| * also only allow cs4270_i2c_probe() to be run once. That means that we do |
| * not support more than one cs4270 device in the system, at least for now. |
| */ |
| static struct snd_soc_codec *cs4270_codec; |
| |
| struct snd_soc_dai cs4270_dai = { |
| .name = "cs4270", |
| .playback = { |
| .stream_name = "Playback", |
| .channels_min = 1, |
| .channels_max = 2, |
| .rates = 0, |
| .formats = CS4270_FORMATS, |
| }, |
| .capture = { |
| .stream_name = "Capture", |
| .channels_min = 1, |
| .channels_max = 2, |
| .rates = 0, |
| .formats = CS4270_FORMATS, |
| }, |
| .ops = { |
| .hw_params = cs4270_hw_params, |
| .set_sysclk = cs4270_set_dai_sysclk, |
| .set_fmt = cs4270_set_dai_fmt, |
| .digital_mute = cs4270_mute, |
| }, |
| }; |
| EXPORT_SYMBOL_GPL(cs4270_dai); |
| |
| /** |
| * 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 platform_device *pdev) |
| { |
| struct snd_soc_device *socdev = platform_get_drvdata(pdev); |
| struct snd_soc_codec *codec = cs4270_codec; |
| unsigned int i; |
| int ret; |
| |
| /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */ |
| socdev->card->codec = 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\n"); |
| return ret; |
| } |
| |
| /* Add the non-DAPM controls */ |
| for (i = 0; i < ARRAY_SIZE(cs4270_snd_controls); i++) { |
| struct snd_kcontrol *kctrl; |
| |
| kctrl = snd_soc_cnew(&cs4270_snd_controls[i], codec, NULL); |
| if (!kctrl) { |
| dev_err(codec->dev, "error creating control '%s'\n", |
| cs4270_snd_controls[i].name); |
| ret = -ENOMEM; |
| goto error_free_pcms; |
| } |
| |
| ret = snd_ctl_add(codec->card, kctrl); |
| if (ret < 0) { |
| dev_err(codec->dev, "error adding control '%s'\n", |
| cs4270_snd_controls[i].name); |
| goto error_free_pcms; |
| } |
| } |
| |
| /* And finally, register the socdev */ |
| ret = snd_soc_init_card(socdev); |
| if (ret < 0) { |
| dev_err(codec->dev, "failed to register card\n"); |
| goto error_free_pcms; |
| } |
| |
| return 0; |
| |
| error_free_pcms: |
| snd_soc_free_pcms(socdev); |
| |
| return ret; |
| } |
| |
| /** |
| * cs4270_remove - ASoC remove function |
| * @pdev: platform device |
| * |
| * This function is the counterpart to cs4270_probe(). |
| */ |
| static int cs4270_remove(struct platform_device *pdev) |
| { |
| struct snd_soc_device *socdev = platform_get_drvdata(pdev); |
| |
| snd_soc_free_pcms(socdev); |
| |
| return 0; |
| }; |
| |
| /** |
| * 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 snd_soc_codec *codec; |
| struct cs4270_private *cs4270; |
| unsigned int reg; |
| int ret; |
| |
| /* For now, we only support one cs4270 device in the system. See the |
| * comment for cs4270_codec. |
| */ |
| if (cs4270_codec) { |
| dev_err(&i2c_client->dev, "ignoring CS4270 at addr %X\n", |
| i2c_client->addr); |
| dev_err(&i2c_client->dev, "only one per board allowed\n"); |
| /* Should we return something other than ENODEV here? */ |
| return -ENODEV; |
| } |
| |
| /* 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); |
| |
| /* Allocate enough space for the snd_soc_codec structure |
| and our private data together. */ |
| cs4270 = kzalloc(sizeof(struct cs4270_private), GFP_KERNEL); |
| if (!cs4270) { |
| dev_err(&i2c_client->dev, "could not allocate codec\n"); |
| return -ENOMEM; |
| } |
| codec = &cs4270->codec; |
| |
| mutex_init(&codec->mutex); |
| INIT_LIST_HEAD(&codec->dapm_widgets); |
| INIT_LIST_HEAD(&codec->dapm_paths); |
| |
| codec->dev = &i2c_client->dev; |
| codec->name = "CS4270"; |
| codec->owner = THIS_MODULE; |
| codec->dai = &cs4270_dai; |
| codec->num_dai = 1; |
| codec->private_data = cs4270; |
| codec->control_data = i2c_client; |
| codec->read = cs4270_read_reg_cache; |
| codec->write = cs4270_i2c_write; |
| codec->reg_cache = cs4270->reg_cache; |
| codec->reg_cache_size = CS4270_NUMREGS; |
| |
| /* The I2C interface is set up, so pre-fill our register cache */ |
| |
| ret = cs4270_fill_cache(codec); |
| if (ret < 0) { |
| dev_err(&i2c_client->dev, "failed to fill register cache\n"); |
| goto error_free_codec; |
| } |
| |
| /* 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. |
| */ |
| |
| reg = cs4270_read_reg_cache(codec, CS4270_MUTE); |
| reg &= ~CS4270_MUTE_AUTO; |
| ret = cs4270_i2c_write(codec, CS4270_MUTE, reg); |
| if (ret < 0) { |
| dev_err(&i2c_client->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. |
| */ |
| |
| reg = cs4270_read_reg_cache(codec, CS4270_TRANS); |
| reg &= ~(CS4270_TRANS_SOFT | CS4270_TRANS_ZERO); |
| ret = cs4270_i2c_write(codec, CS4270_TRANS, reg); |
| if (ret < 0) { |
| dev_err(&i2c_client->dev, "i2c write failed\n"); |
| return ret; |
| } |
| |
| /* Initialize the DAI. Normally, we'd prefer to have a kmalloc'd DAI |
| * structure for each CS4270 device, but the machine driver needs to |
| * have a pointer to the DAI structure, so for now it must be a global |
| * variable. |
| */ |
| cs4270_dai.dev = &i2c_client->dev; |
| |
| /* Register the DAI. If all the other ASoC driver have already |
| * registered, then this will call our probe function, so |
| * cs4270_codec needs to be ready. |
| */ |
| cs4270_codec = codec; |
| ret = snd_soc_register_dai(&cs4270_dai); |
| if (ret < 0) { |
| dev_err(&i2c_client->dev, "failed to register DAIe\n"); |
| goto error_free_codec; |
| } |
| |
| i2c_set_clientdata(i2c_client, cs4270); |
| |
| return 0; |
| |
| error_free_codec: |
| kfree(cs4270); |
| cs4270_codec = NULL; |
| cs4270_dai.dev = NULL; |
| |
| 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) |
| { |
| struct cs4270_private *cs4270 = i2c_get_clientdata(i2c_client); |
| |
| kfree(cs4270); |
| cs4270_codec = NULL; |
| cs4270_dai.dev = NULL; |
| |
| return 0; |
| } |
| |
| /* |
| * cs4270_id - I2C device IDs supported by this driver |
| */ |
| static 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, |
| }; |
| |
| /* |
| * ASoC codec device structure |
| * |
| * Assign this variable to the codec_dev field of the machine driver's |
| * snd_soc_device structure. |
| */ |
| struct snd_soc_codec_device soc_codec_device_cs4270 = { |
| .probe = cs4270_probe, |
| .remove = cs4270_remove |
| }; |
| EXPORT_SYMBOL_GPL(soc_codec_device_cs4270); |
| |
| static int __init cs4270_init(void) |
| { |
| pr_info("Cirrus Logic CS4270 ALSA SoC Codec Driver\n"); |
| |
| 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"); |