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Diffstat (limited to 'sound/soc/codecs/cs4270.c')
| -rw-r--r-- | sound/soc/codecs/cs4270.c | 805 |
1 files changed, 805 insertions, 0 deletions
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c new file mode 100644 index 00000000000..5d601ad6da7 --- /dev/null +++ b/sound/soc/codecs/cs4270.c @@ -0,0 +1,805 @@ +/* + * CS4270 ALSA SoC (ASoC) codec driver + * + * Author: Timur Tabi <timur@freescale.com> + * + * Copyright 2007 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 automatically + * selected if I2C is disabled or if a CS4270 is not found on the I2C + * bus. However, stand-alone mode is only partially implemented because + * there is no mechanism yet for this driver and the machine driver to + * communicate the values of the M0, M1, MCLK1, and MCLK2 pins. + * 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/driver.h> +#include <sound/core.h> +#include <sound/soc.h> +#include <sound/initval.h> +#include <linux/i2c.h> + +#include "cs4270.h" + +/* If I2C is defined, then we support software mode. However, if we're + not compiled as module but I2C is, then we can't use I2C calls. */ +#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) +#define USE_I2C +#endif + +/* Private data for the CS4270 */ +struct cs4270_private { + unsigned int mclk; /* Input frequency of the MCLK pin */ + unsigned int mode; /* The mode (I2S or left-justified) */ +}; + +/* The number of MCLK/LRCK ratios supported by the CS4270 */ +#define NUM_MCLK_RATIOS 9 + +/* The actual MCLK/LRCK ratios, in increasing numerical order */ +static unsigned int mclk_ratios[NUM_MCLK_RATIOS] = + {64, 96, 128, 192, 256, 384, 512, 768, 1024}; + +/* + * Determine the CS4270 samples rates. + * + * 'freq' is the input frequency to MCLK. The other parameters are ignored. + * + * 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 + * support 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 support 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. + * + * Note that in stand-alone mode, the sample rate is determined by input + * pins M0, M1, MDIV1, and MDIV2. Also in stand-alone mode, divide-by-3 + * is not a programmable option. However, divide-by-3 is not an available + * option in stand-alone mode. This cases two problems: a ratio of 768 is + * not available (it requires divide-by-3) and B) ratios 192 and 384 can + * only be selected with divide-by-1.5, but there is an errate that make + * this selection difficult. + * + * In addition, there is no mechanism for communicating with the machine + * driver what the input settings can be. This would need to be implemented + * for stand-alone mode to work. + */ +static int cs4270_set_dai_sysclk(struct snd_soc_codec_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 / mclk_ratios[i]; + 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) { + printk(KERN_ERR "cs4270: 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; +} + +/* + * Configure the codec for the selected audio 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_codec_dai *codec_dai, + unsigned int format) +{ + struct snd_soc_codec *codec = codec_dai->codec; + struct cs4270_private *cs4270 = codec->private_data; + int ret = 0; + + 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: + printk(KERN_ERR "cs4270: invalid DAI format\n"); + ret = -EINVAL; + } + + return ret; +} + +/* + * 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) + +#ifdef USE_I2C + +/* 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 + +/* + * A list of addresses on which this CS4270 could use. I2C addresses are + * 7 bits. For the CS4270, the upper four bits are always 1001, and the + * lower three bits are determined via the AD2, AD1, and AD0 pins + * (respectively). + */ +static unsigned short normal_i2c[] = { + 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, I2C_CLIENT_END +}; +I2C_CLIENT_INSMOD; + +/* + * Pre-fill the CS4270 register cache. + * + * 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) { + printk(KERN_ERR "cs4270: I2C read failure, addr=0x%x\n", + i2c_client->addr); + return -EIO; + } + + return 0; +} + +/* + * Read from the CS4270 register cache. + * + * 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 coherncy 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]; +} + +/* + * Write to a CS4270 register via the I2C bus. + * + * 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)) { + printk(KERN_ERR "cs4270: I2C write failed\n"); + return -EIO; + } + + /* We've written to the hardware, so update the cache */ + cache[reg - CS4270_FIRSTREG] = value; + } + + return 0; +} + +/* + * Clock Ratio Selection for Master Mode with I2C enabled + * + * 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. + * + * Each element in this array corresponds to the ratios in mclk_ratios[]. + * These two arrays need to be in sync. + * + * '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 = 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. + */ +static struct { + u8 speed_mode; + u8 mclk; +} cs4270_mode_ratios[NUM_MCLK_RATIOS] = { + {CS4270_MODE_4X, CS4270_MODE_DIV1}, /* 64 */ +#ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA + {CS4270_MODE_4X, CS4270_MODE_DIV15}, /* 96 */ +#endif + {CS4270_MODE_2X, CS4270_MODE_DIV1}, /* 128 */ + {CS4270_MODE_4X, CS4270_MODE_DIV3}, /* 192 */ + {CS4270_MODE_1X, CS4270_MODE_DIV1}, /* 256 */ + {CS4270_MODE_2X, CS4270_MODE_DIV3}, /* 384 */ + {CS4270_MODE_1X, CS4270_MODE_DIV2}, /* 512 */ + {CS4270_MODE_1X, CS4270_MODE_DIV3}, /* 768 */ + {CS4270_MODE_1X, CS4270_MODE_DIV4} /* 1024 */ +}; + +/* + * Program the CS4270 with the given hardware parameters. + * + * The .dai_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_pcm_runtime *rtd = substream->private_data; + struct snd_soc_device *socdev = rtd->socdev; + struct snd_soc_codec *codec = socdev->codec; + struct cs4270_private *cs4270 = codec->private_data; + unsigned int ret = 0; + 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 (mclk_ratios[i] == ratio) + break; + } + + if (i == NUM_MCLK_RATIOS) { + /* We did not find a matching ratio */ + printk(KERN_ERR "cs4270: could not find matching ratio\n"); + return -EINVAL; + } + + /* Freeze and power-down the codec */ + + ret = snd_soc_write(codec, CS4270_PWRCTL, CS4270_PWRCTL_FREEZE | + CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | + CS4270_PWRCTL_PDN); + if (ret < 0) { + printk(KERN_ERR "cs4270: I2C write failed\n"); + return ret; + } + + /* Program the mode control register */ + + reg = snd_soc_read(codec, CS4270_MODE); + reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK); + reg |= cs4270_mode_ratios[i].speed_mode | cs4270_mode_ratios[i].mclk; + + ret = snd_soc_write(codec, CS4270_MODE, reg); + if (ret < 0) { + printk(KERN_ERR "cs4270: I2C write failed\n"); + return ret; + } + + /* Program the format register */ + + 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: + printk(KERN_ERR "cs4270: unknown format\n"); + return -EINVAL; + } + + ret = snd_soc_write(codec, CS4270_FORMAT, reg); + if (ret < 0) { + printk(KERN_ERR "cs4270: I2C write failed\n"); + return ret; + } + + /* Disable auto-mute. This feature appears to be buggy, because in + some situations, auto-mute will not deactivate when it should. */ + + reg = snd_soc_read(codec, CS4270_MUTE); + reg &= ~CS4270_MUTE_AUTO; + ret = snd_soc_write(codec, CS4270_MUTE, reg); + if (ret < 0) { + printk(KERN_ERR "cs4270: I2C write failed\n"); + return ret; + } + + /* Thaw and power-up the codec */ + + ret = snd_soc_write(codec, CS4270_PWRCTL, 0); + if (ret < 0) { + printk(KERN_ERR "cs4270: I2C write failed\n"); + return ret; + } + + return ret; +} + +#ifdef CONFIG_SND_SOC_CS4270_HWMUTE + +/* + * Set the CS4270 external 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_codec_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_ADC_A | CS4270_MUTE_ADC_B | + CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B; + else + reg6 &= ~(CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B | + CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B); + + return snd_soc_write(codec, CS4270_MUTE, reg6); +} + +#endif + +static int cs4270_i2c_probe(struct i2c_adapter *adap, int addr, int kind); + +/* + * Notify the driver that a new I2C bus has been found. + * + * This function is called for each I2C bus in the system. The function + * then asks the I2C subsystem to probe that bus at the addresses on which + * our device (the CS4270) could exist. If a device is found at one of + * those addresses, then our probe function (cs4270_i2c_probe) is called. + */ +static int cs4270_i2c_attach(struct i2c_adapter *adapter) +{ + return i2c_probe(adapter, &addr_data, cs4270_i2c_probe); +} + +static int cs4270_i2c_detach(struct i2c_client *client) +{ + struct snd_soc_codec *codec = i2c_get_clientdata(client); + + i2c_detach_client(client); + codec->control_data = NULL; + + kfree(codec->reg_cache); + codec->reg_cache = NULL; + + kfree(client); + return 0; +} + +/* 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) +}; + +static struct i2c_driver cs4270_i2c_driver = { + .driver = { + .name = "CS4270 I2C", + .owner = THIS_MODULE, + }, + .id = I2C_DRIVERID_CS4270, + .attach_adapter = cs4270_i2c_attach, + .detach_client = cs4270_i2c_detach, +}; + +/* + * Global variable to store socdev for i2c probe function. + * + * If struct i2c_driver had a private_data field, we wouldn't need to use + * cs4270_socdec. This is the only way to pass the socdev structure to + * cs4270_i2c_probe(). + * + * The real solution to cs4270_socdev is to create a mechanism + * that maps I2C addresses to snd_soc_device structures. Perhaps the + * creation of the snd_soc_device object should be moved out of + * cs4270_probe() and into cs4270_i2c_probe(), but that would make this + * driver dependent on I2C. The CS4270 supports "stand-alone" mode, whereby + * the chip is *not* connected to the I2C bus, but is instead configured via + * input pins. + */ +static struct snd_soc_device *cs4270_socdev; + +/* + * Initialize the I2C interface of the CS4270 + * + * This function is called for whenever the I2C subsystem finds a device + * at a particular address. + * + * Note: snd_soc_new_pcms() must be called before this function can be called, + * because of snd_ctl_add(). + */ +static int cs4270_i2c_probe(struct i2c_adapter *adapter, int addr, int kind) +{ + struct snd_soc_device *socdev = cs4270_socdev; + struct snd_soc_codec *codec = socdev->codec; + struct i2c_client *i2c_client = NULL; + int i; + int ret = 0; + + /* Probing all possible addresses has one drawback: if there are + multiple CS4270s on the bus, then you cannot specify which + socdev is matched with which CS4270. For now, we just reject + this I2C device if the socdev already has one attached. */ + if (codec->control_data) + return -ENODEV; + + /* Note: codec_dai->codec is NULL here */ + + i2c_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); + if (!i2c_client) { + printk(KERN_ERR "cs4270: could not allocate I2C client\n"); + return -ENOMEM; + } + + codec->reg_cache = kzalloc(CS4270_NUMREGS, GFP_KERNEL); + if (!codec->reg_cache) { + printk(KERN_ERR "cs4270: could not allocate register cache\n"); + ret = -ENOMEM; + goto error; + } + + i2c_set_clientdata(i2c_client, codec); + strcpy(i2c_client->name, "CS4270"); + + i2c_client->driver = &cs4270_i2c_driver; + i2c_client->adapter = adapter; + i2c_client->addr = addr; + + /* Verify that we have a CS4270 */ + + ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID); + if (ret < 0) { + printk(KERN_ERR "cs4270: failed to read I2C\n"); + goto error; + } + /* The top four bits of the chip ID should be 1100. */ + if ((ret & 0xF0) != 0xC0) { + /* The device at this address is not a CS4270 codec */ + ret = -ENODEV; + goto error; + } + + printk(KERN_INFO "cs4270: found device at I2C address %X\n", addr); + printk(KERN_INFO "cs4270: hardware revision %X\n", ret & 0xF); + + /* Tell the I2C layer a new client has arrived */ + + ret = i2c_attach_client(i2c_client); + if (ret) { + printk(KERN_ERR "cs4270: could not attach codec, " + "I2C address %x, error code %i\n", addr, ret); + goto error; + } + + codec->control_data = i2c_client; + codec->read = cs4270_read_reg_cache; + codec->write = cs4270_i2c_write; + 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) { + printk(KERN_ERR "cs4270: failed to fill register cache\n"); + goto error; + } + + /* Add the non-DAPM controls */ + + for (i = 0; i < ARRAY_SIZE(cs4270_snd_controls); i++) { + struct snd_kcontrol *kctrl = + snd_soc_cnew(&cs4270_snd_controls[i], codec, NULL); + + ret = snd_ctl_add(codec->card, kctrl); + if (ret < 0) + goto error; + } + + return 0; + +error: + if (codec->control_data) { + i2c_detach_client(i2c_client); + codec->control_data = NULL; + } + + kfree(codec->reg_cache); + codec->reg_cache = NULL; + codec->reg_cache_size = 0; + + kfree(i2c_client); + + return ret; +} + +#endif + +struct snd_soc_codec_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, + }, + .dai_ops = { + .set_sysclk = cs4270_set_dai_sysclk, + .set_fmt = cs4270_set_dai_fmt, + } +}; +EXPORT_SYMBOL_GPL(cs4270_dai); + +/* + * ASoC probe function + * + * This function is called when the machine driver calls + * platform_device_add(). + */ +static int cs4270_probe(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + struct snd_soc_codec *codec; + int ret = 0; + + printk(KERN_INFO "CS4270 ALSA SoC Codec\n"); + + /* Allocate enough space for the snd_soc_codec structure + and our private data together. */ + codec = kzalloc(ALIGN(sizeof(struct snd_soc_codec), 4) + + sizeof(struct cs4270_private), GFP_KERNEL); + if (!codec) { + printk(KERN_ERR "cs4270: Could not allocate codec structure\n"); + return -ENOMEM; + } + + mutex_init(&codec->mutex); + INIT_LIST_HEAD(&codec->dapm_widgets); + INIT_LIST_HEAD(&codec->dapm_paths); + + codec->name = "CS4270"; + codec->owner = THIS_MODULE; + codec->dai = &cs4270_dai; + codec->num_dai = 1; + codec->private_data = codec + ALIGN(sizeof(struct snd_soc_codec), 4); + + socdev->codec = codec; + + /* Register PCMs */ + + ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); + if (ret < 0) { + printk(KERN_ERR "cs4270: failed to create PCMs\n"); + return ret; + } + +#ifdef USE_I2C + cs4270_socdev = socdev; + + ret = i2c_add_driver(&cs4270_i2c_driver); + if (ret) { + printk(KERN_ERR "cs4270: failed to attach driver"); + snd_soc_free_pcms(socdev); + return ret; + } + + /* Did we find a CS4270 on the I2C bus? */ + if (codec->control_data) { + /* Initialize codec ops */ + cs4270_dai.ops.hw_params = cs4270_hw_params; +#ifdef CONFIG_SND_SOC_CS4270_HWMUTE + cs4270_dai.dai_ops.digital_mute = cs4270_mute; +#endif + } else + printk(KERN_INFO "cs4270: no I2C device found, " + "using stand-alone mode\n"); +#else + printk(KERN_INFO "cs4270: I2C disabled, using stand-alone mode\n"); +#endif + + ret = snd_soc_register_card(socdev); + if (ret < 0) { + printk(KERN_ERR "cs4270: failed to register card\n"); + snd_soc_free_pcms(socdev); + return ret; + } + + return ret; +} + +static int cs4270_remove(struct platform_device *pdev) +{ + struct snd_soc_device *socdev = platform_get_drvdata(pdev); + + snd_soc_free_pcms(socdev); + +#ifdef USE_I2C + if (socdev->codec->control_data) + i2c_del_driver(&cs4270_i2c_driver); +#endif + + kfree(socdev->codec); + socdev->codec = NULL; + + return 0; +} + +/* + * 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); + +MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); +MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); +MODULE_LICENSE("GPL"); |