#include <linux/delay.h>
#include <linux/regulator/consumer.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.
#define CS4270_MUTE_DAC_A 0x01
#define CS4270_MUTE_DAC_B 0x02
+/* Power-on default values for the registers
+ *
+ * This array contains the power-on default values of the registers, with the
+ * exception of the "CHIPID" register (01h). The lower four bits of that
+ * register contain the hardware revision, so it is treated as volatile.
+ *
+ * Also note that on the CS4270, the first readable register is 1, but ASoC
+ * assumes the first register is 0. Therfore, the array must have an entry for
+ * register 0, but we use cs4270_reg_is_readable() to tell ASoC that it can't
+ * be read.
+ */
+static const u8 cs4270_default_reg_cache[CS4270_LASTREG + 1] = {
+ 0x00, 0x00, 0x00, 0x30, 0x00, 0x60, 0x20, 0x00, 0x00
+};
+
static const char *supply_names[] = {
"va", "vd", "vlc"
};
/* Private data for the CS4270 */
struct cs4270_private {
- struct snd_soc_codec codec;
- u8 reg_cache[CS4270_NUMREGS];
+ enum snd_soc_control_type control_type;
+ void *control_data;
unsigned int mclk; /* Input frequency of the MCLK pin */
unsigned int mode; /* The mode (I2S or left-justified) */
unsigned int slave_mode;
/* The number of MCLK/LRCK ratios supported by the CS4270 */
#define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios)
+static int cs4270_reg_is_readable(unsigned int reg)
+{
+ return (reg >= CS4270_FIRSTREG) && (reg <= CS4270_LASTREG);
+}
+
+static int cs4270_reg_is_volatile(unsigned int reg)
+{
+ /* Unreadable registers are considered volatile */
+ if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
+ return 1;
+
+ return reg == CS4270_CHIPID;
+}
+
/**
* cs4270_set_dai_sysclk - determine the CS4270 samples rates.
* @codec_dai: the codec DAI
{
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;
}
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 | CS4270_I2C_INCR, 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
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 snd_soc_codec *codec = rtd->codec;
struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
int ret;
unsigned int i;
snd_soc_get_volsw, cs4270_soc_put_mute),
};
-/*
- * 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;
-
static struct snd_soc_dai_ops cs4270_dai_ops = {
.hw_params = cs4270_hw_params,
.set_sysclk = cs4270_set_dai_sysclk,
.digital_mute = cs4270_dai_mute,
};
-struct snd_soc_dai cs4270_dai = {
- .name = "cs4270",
+static struct snd_soc_dai_driver cs4270_dai = {
+ .name = "cs4270-hifi",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2,
- .rates = 0,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .rate_min = 4000,
+ .rate_max = 216000,
.formats = CS4270_FORMATS,
},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 2,
- .rates = 0,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .rate_min = 4000,
+ .rate_max = 216000,
.formats = CS4270_FORMATS,
},
.ops = &cs4270_dai_ops,
};
-EXPORT_SYMBOL_GPL(cs4270_dai);
/**
* cs4270_probe - ASoC probe function
* 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)
+static int cs4270_probe(struct snd_soc_codec *codec)
{
- 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;
- /* Connect the codec to the socdev. snd_soc_new_pcms() needs this. */
- socdev->card->codec = codec;
+ codec->control_data = cs4270->control_data;
- /* Register PCMs */
- ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+ /* Tell ASoC what kind of I/O to use to read the registers. ASoC will
+ * then do the I2C transactions itself.
+ */
+ ret = snd_soc_codec_set_cache_io(codec, 8, 8, cs4270->control_type);
+ if (ret < 0) {
+ dev_err(codec->dev, "failed to set cache I/O (ret=%i)\n", ret);
+ return ret;
+ }
+
+ /* Disable auto-mute. This feature appears to be buggy. In some
+ * situations, auto-mute will not deactivate when it should, so we want
+ * this feature disabled by default. An application (e.g. alsactl) can
+ * re-enabled it by using the controls.
+ */
+ ret = snd_soc_update_bits(codec, CS4270_MUTE, CS4270_MUTE_AUTO, 0);
+ if (ret < 0) {
+ dev_err(codec->dev, "i2c write failed\n");
+ return ret;
+ }
+
+ /* Disable automatic volume control. The hardware enables, and it
+ * causes volume change commands to be delayed, sometimes until after
+ * playback has started. An application (e.g. alsactl) can
+ * re-enabled it by using the controls.
+ */
+ ret = snd_soc_update_bits(codec, CS4270_TRANS,
+ CS4270_TRANS_SOFT | CS4270_TRANS_ZERO, 0);
if (ret < 0) {
- dev_err(codec->dev, "failed to create pcms\n");
+ dev_err(codec->dev, "i2c write failed\n");
return ret;
}
ARRAY_SIZE(cs4270_snd_controls));
if (ret < 0) {
dev_err(codec->dev, "failed to add controls\n");
- goto error_free_pcms;
+ return ret;
}
/* get the power supply regulators */
ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(cs4270->supplies),
cs4270->supplies);
if (ret < 0)
- goto error_free_pcms;
+ return ret;
ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies),
cs4270->supplies);
regulator_bulk_free(ARRAY_SIZE(cs4270->supplies),
cs4270->supplies);
-error_free_pcms:
- snd_soc_free_pcms(socdev);
-
return ret;
}
*
* This function is the counterpart to cs4270_probe().
*/
-static int cs4270_remove(struct platform_device *pdev)
+static int cs4270_remove(struct snd_soc_codec *codec)
{
- 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);
- 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;
};
+#ifdef CONFIG_PM
+
+/* This suspend/resume implementation can handle both - a simple standby
+ * where the codec remains powered, and a full suspend, where the voltage
+ * domain the codec is connected to is teared down and/or any other hardware
+ * reset condition is asserted.
+ *
+ * The codec's own power saving features are enabled in the suspend callback,
+ * and all registers are written back to the hardware when resuming.
+ */
+
+static int cs4270_soc_suspend(struct snd_soc_codec *codec, pm_message_t mesg)
+{
+ struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
+ int reg, ret;
+
+ reg = snd_soc_read(codec, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL;
+ if (reg < 0)
+ return reg;
+
+ ret = snd_soc_write(codec, CS4270_PWRCTL, reg);
+ if (ret < 0)
+ return ret;
+
+ regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies),
+ cs4270->supplies);
+
+ return 0;
+}
+
+static int cs4270_soc_resume(struct snd_soc_codec *codec)
+{
+ struct cs4270_private *cs4270 = snd_soc_codec_get_drvdata(codec);
+ 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 */
+
+/*
+ * ASoC codec device structure
+ *
+ * Assign this variable to the codec_dev field of the machine driver's
+ * snd_soc_device structure.
+ */
+static const struct snd_soc_codec_driver soc_codec_device_cs4270 = {
+ .probe = cs4270_probe,
+ .remove = cs4270_remove,
+ .suspend = cs4270_soc_suspend,
+ .resume = cs4270_soc_resume,
+ .volatile_register = cs4270_reg_is_volatile,
+ .readable_register = cs4270_reg_is_readable,
+ .reg_cache_size = CS4270_LASTREG + 1,
+ .reg_word_size = sizeof(u8),
+ .reg_cache_default = cs4270_default_reg_cache,
+};
+
/**
* cs4270_i2c_probe - initialize the I2C interface of the CS4270
* @i2c_client: the I2C client object
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);
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;
- 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;
-
- /* 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);
+ cs4270->control_data = i2c_client;
+ cs4270->control_type = SND_SOC_I2C;
- return 0;
-
-error_free_codec:
- kfree(cs4270);
- cs4270_codec = NULL;
- cs4270_dai.dev = NULL;
-
+ ret = snd_soc_register_codec(&i2c_client->dev,
+ &soc_codec_device_cs4270, &cs4270_dai, 1);
+ if (ret < 0)
+ kfree(cs4270);
return ret;
}
*/
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;
-
+ snd_soc_unregister_codec(&i2c_client->dev);
+ kfree(i2c_get_clientdata(i2c_client));
return 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;
-
- 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
*
*/
static struct i2c_driver cs4270_i2c_driver = {
.driver = {
- .name = "cs4270",
+ .name = "cs4270-codec",
.owner = THIS_MODULE,
},
.id_table = cs4270_id,
.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,
- .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");
git.openpandora.org / pandora-kernel.git / blobdiff