*
* 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.
+ * 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 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)
+ * - 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/platform_device.h>
-#include <sound/driver.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 "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.
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_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_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_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 const char *supply_names[] = {
+ "va", "vd", "vlc"
+};
+
+/* 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;
+ 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.
*/
-static unsigned short normal_i2c[] = {
- 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, I2C_CLIENT_END
+struct cs4270_mode_ratios {
+ unsigned int ratio;
+ u8 speed_mode;
+ u8 mclk;
};
-I2C_CLIENT_INSMOD;
-/*
- * Pre-fill the CS4270 register cache.
+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.
+ *
+ * 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);
+ unsigned int rates = 0;
+ unsigned int rate_min = -1;
+ unsigned int rate_max = 0;
+ unsigned int i;
+
+ cs4270->mclk = freq;
+
+ if (cs4270->mclk) {
+ 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;
+ }
+ } else {
+ /* enable all possible rates */
+ rates = SNDRV_PCM_RATE_8000_192000;
+ rate_min = 8000;
+ rate_max = 192000;
+ }
+
+ 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 = snd_soc_codec_get_drvdata(codec);
+ 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.
s32 length;
length = i2c_smbus_read_i2c_block_data(i2c_client,
- CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache);
+ CS4270_FIRSTREG | CS4270_I2C_INCR, CS4270_NUMREGS, cache);
if (length != CS4270_NUMREGS) {
- printk(KERN_ERR "cs4270: I2C read failure, addr=0x%x\n",
+ dev_err(codec->dev, "i2c read failure, addr=0x%x\n",
i2c_client->addr);
return -EIO;
}
return 0;
}
-/*
- * Read from the CS4270 register cache.
+/**
+ * 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 coherncy problem.
+ * 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)
return cache[reg - CS4270_FIRSTREG];
}
-/*
- * Write to a CS4270 register via the I2C bus.
+/**
+ * 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.
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");
+ dev_err(codec->dev, "i2c write failed\n");
return -EIO;
}
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
+/**
+ * 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)
*
- * '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.
+ * This function programs the hardware with the values provided.
+ * Specifically, the sample rate and the data format.
*
- * The .dai_ops functions are used to provide board-specific data, like
- * input frequencies, to this driver. This function takes that information,
+ * 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_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->codec;
- struct cs4270_private *cs4270 = codec->private_data;
- unsigned int ret = 0;
+ struct snd_soc_codec *codec = socdev->card->codec;
+ struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
+ int ret;
unsigned int i;
unsigned int rate;
unsigned int ratio;
ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */
for (i = 0; i < NUM_MCLK_RATIOS; i++) {
- if (mclk_ratios[i] == ratio)
+ if (cs4270_mode_ratios[i].ratio == ratio)
break;
}
if (i == NUM_MCLK_RATIOS) {
/* We did not find a matching ratio */
- printk(KERN_ERR "cs4270: could not find matching ratio\n");
+ dev_err(codec->dev, "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 */
+ /* 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].speed_mode | cs4270_mode_ratios[i].mclk;
+ 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) {
- printk(KERN_ERR "cs4270: I2C write failed\n");
+ dev_err(codec->dev, "i2c write failed\n");
return ret;
}
- /* Program the format register */
+ /* Set the DAI format */
reg = snd_soc_read(codec, CS4270_FORMAT);
reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK);
reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ;
break;
default:
- printk(KERN_ERR "cs4270: unknown format\n");
+ dev_err(codec->dev, "unknown dai 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");
+ dev_err(codec->dev, "i2c write failed\n");
return ret;
}
return ret;
}
-#ifdef CONFIG_SND_SOC_CS4270_HWMUTE
-
-/*
- * Set the CS4270 external mute
+/**
+ * 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_mute(struct snd_soc_codec_dai *dai, int mute)
+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_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);
+ 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);
}
-#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.
+/**
+ * cs4270_soc_put_mute - put callback for the 'Master Playback switch'
+ * alsa control.
+ * @kcontrol: mixer control
+ * @ucontrol: control element information
*
- * 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.
+ * 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_i2c_attach(struct i2c_adapter *adapter)
+static int cs4270_soc_put_mute(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
{
- 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;
+ 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];
- kfree(codec->reg_cache);
- codec->reg_cache = NULL;
+ cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) |
+ (right ? CS4270_MUTE_DAC_B : 0);
- kfree(client);
- return 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)
-};
-
-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,
+ 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),
};
/*
- * Global variable to store socdev for i2c probe function.
+ * 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_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.
+ * 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_device *cs4270_socdev;
+static struct snd_soc_codec *cs4270_codec;
-/*
- * Initialize the I2C interface of the CS4270
- *
- * This function is called for whenever the I2C subsystem finds a device
- * at a particular address.
+static 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,
+};
+
+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 = &cs4270_dai_ops,
+};
+EXPORT_SYMBOL_GPL(cs4270_dai);
+
+/**
+ * cs4270_probe - ASoC probe function
+ * @pdev: platform device
*
- * Note: snd_soc_new_pcms() must be called before this function can be called,
- * because of snd_ctl_add().
+ * This function is called when ASoC has all the pieces it needs to
+ * instantiate a sound driver.
*/
-static int cs4270_i2c_probe(struct i2c_adapter *adapter, int addr, int kind)
+static int cs4270_probe(struct platform_device *pdev)
{
- 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;
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = cs4270_codec;
+ struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
+ int i, ret;
- /* Verify that we have a CS4270 */
+ /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
+ socdev->card->codec = codec;
- ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID);
+ /* Register PCMs */
+ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
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;
+ dev_err(codec->dev, "failed to create pcms\n");
+ return ret;
}
- 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);
+ /* Add the non-DAPM controls */
+ ret = snd_soc_add_controls(codec, cs4270_snd_controls,
+ ARRAY_SIZE(cs4270_snd_controls));
if (ret < 0) {
- printk(KERN_ERR "cs4270: failed to fill register cache\n");
- goto error;
+ dev_err(codec->dev, "failed to add controls\n");
+ goto error_free_pcms;
}
- /* Add the non-DAPM controls */
+ /* get the power supply regulators */
+ for (i = 0; i < ARRAY_SIZE(supply_names); i++)
+ cs4270->supplies[i].supply = supply_names[i];
- for (i = 0; i < ARRAY_SIZE(cs4270_snd_controls); i++) {
- struct snd_kcontrol *kctrl =
- snd_soc_cnew(&cs4270_snd_controls[i], codec, NULL);
+ ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(cs4270->supplies),
+ cs4270->supplies);
+ if (ret < 0)
+ goto error_free_pcms;
- ret = snd_ctl_add(codec->card, kctrl);
- if (ret < 0)
- goto error;
- }
+ ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies),
+ cs4270->supplies);
+ if (ret < 0)
+ goto error_free_regulators;
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;
+error_free_regulators:
+ regulator_bulk_free(ARRAY_SIZE(cs4270->supplies),
+ cs4270->supplies);
- kfree(i2c_client);
+error_free_pcms:
+ snd_soc_free_pcms(socdev);
return ret;
}
-#endif
+/**
+ * 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);
+ struct snd_soc_codec *codec = cs4270_codec;
+ struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
-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,
- }
+ snd_soc_free_pcms(socdev);
+ regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), cs4270->supplies);
+ regulator_bulk_free(ARRAY_SIZE(cs4270->supplies), cs4270->supplies);
+
+ return 0;
};
-EXPORT_SYMBOL_GPL(cs4270_dai);
-/*
- * ASoC probe function
+/**
+ * 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 when the machine driver calls
- * platform_device_add().
+ * 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_probe(struct platform_device *pdev)
+static int cs4270_i2c_probe(struct i2c_client *i2c_client,
+ const struct i2c_device_id *id)
{
- struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
- int ret = 0;
+ 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;
+ }
- printk(KERN_INFO "CS4270 ALSA SoC Codec\n");
+ /* 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. */
- 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");
+ 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 = (void *) codec +
- ALIGN(sizeof(struct snd_soc_codec), 4);
-
- socdev->codec = codec;
+ snd_soc_codec_set_drvdata(codec, 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;
- /* Register PCMs */
+ /* The I2C interface is set up, so pre-fill our register cache */
- ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+ ret = cs4270_fill_cache(codec);
if (ret < 0) {
- printk(KERN_ERR "cs4270: failed to create PCMs\n");
- return ret;
+ dev_err(&i2c_client->dev, "failed to fill register cache\n");
+ goto error_free_codec;
}
-#ifdef USE_I2C
- cs4270_socdev = socdev;
+ /* 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 = i2c_add_driver(&cs4270_i2c_driver);
- if (ret) {
- printk(KERN_ERR "cs4270: failed to attach driver");
- snd_soc_free_pcms(socdev);
+ 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;
}
- /* 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
+ /* 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_register_card(socdev);
+ 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) {
- printk(KERN_ERR "cs4270: failed to register card\n");
- snd_soc_free_pcms(socdev);
+ 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;
}
-static int cs4270_remove(struct platform_device *pdev)
+/**
+ * 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 snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct cs4270_private *cs4270 = i2c_get_clientdata(i2c_client);
- snd_soc_free_pcms(socdev);
+ kfree(cs4270);
+ cs4270_codec = NULL;
+ cs4270_dai.dev = NULL;
-#ifdef USE_I2C
- if (socdev->codec->control_data)
- i2c_del_driver(&cs4270_i2c_driver);
-#endif
+ 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);
+
+#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 platform_device *pdev, pm_message_t mesg)
+{
+ struct snd_soc_codec *codec = cs4270_codec;
+ struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
+ int reg, ret;
- kfree(socdev->codec);
- socdev->codec = NULL;
+ 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 platform_device *pdev)
+{
+ struct snd_soc_codec *codec = cs4270_codec;
+ struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
+ struct i2c_client *i2c_client = codec->control_data;
+ 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 ... */
+ for (reg = CS4270_FIRSTREG; reg <= CS4270_LASTREG; reg++) {
+ u8 val = snd_soc_read(codec, reg);
+
+ if (i2c_smbus_write_byte_data(i2c_client, reg, val)) {
+ dev_err(codec->dev, "i2c write failed\n");
+ return -EIO;
+ }
+ }
+
+ /* ... 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 */
+
+/*
+ * 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
*
*/
struct snd_soc_codec_device soc_codec_device_cs4270 = {
.probe = cs4270_probe,
- .remove = cs4270_remove
+ .remove = cs4270_remove,
+ .suspend = cs4270_soc_suspend,
+ .resume = cs4270_soc_resume,
};
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");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff