Commit 9dbd627b authored by Timur Tabi's avatar Timur Tabi Committed by Jaroslav Kysela
Browse files

[ALSA] CS4270 driver does not compile with I2C disabled 



Fix compilation errors with the CS4270 when I2C is not enabled.  Updated
some comments to indicate that that stand-alone mode is not fully implemented,
because there is no mechanism for the CS4270 driver and the machine driver to
communicate the values of various input pins.

Signed-off-by: default avatarTimur Tabi <timur@freescale.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Signed-off-by: default avatarJaroslav Kysela <perex@suse.cz>
parent b0c813ce

sound/soc/codecs/cs4270.c

+172 −147
Original line number Diff line number Diff line
@@ -12,9 +12,11 @@ 
 *

 * Current features/limitations:

 *

 * 1) Stand-alone and software mode is supported.  Stand-alone is

 *    automatically selected if I2C is disabled or if a CS4270 is not found

 *    on the I2C bus.

 * 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
@@ -34,12 +36,157 @@ 


#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};



/*

 * Sampling rate <-> bit patter mapping

 *

 * This array maps sampling rates to their SNDRV_PCM_RATE_x equivalent.

 *

 * This is really something that ALSA should provide.

 *

 * This table is used by cs4270_set_dai_sysclk() to tell ALSA which sampling

 * rates the CS4270 currently supports.

 */

static struct {

	unsigned int rate;

	unsigned int bit;

} rate_map[] = {

	{5512, SNDRV_PCM_RATE_5512},

	{8000, SNDRV_PCM_RATE_8000},

	{11025, SNDRV_PCM_RATE_11025},

	{16000, SNDRV_PCM_RATE_16000},

	{22050, SNDRV_PCM_RATE_22050},

	{32000, SNDRV_PCM_RATE_32000},

	{44100, SNDRV_PCM_RATE_44100},

	{48000, SNDRV_PCM_RATE_48000},

	{64000, SNDRV_PCM_RATE_64000},

	{88200, SNDRV_PCM_RATE_88200},

	{96000, SNDRV_PCM_RATE_96000},

	{176400, SNDRV_PCM_RATE_176400},

	{192000, SNDRV_PCM_RATE_192000}

};



/*

 * 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;

		unsigned int j;

		rate = freq / mclk_ratios[i];

		for (j = 0; j < ARRAY_SIZE(rate_map); j++) {

			if (rate == rate_map[j].rate) {

				rates |= rate_map[j].bit;

				if (rate < rate_min)

					rate_min = rate;

				if (rate > rate_max)

					rate_max = rate;

			}

		}

	}



	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.
@@ -53,7 +200,7 @@ struct cs4270_private { 
			SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \

			SNDRV_PCM_FMTBIT_S24_LE  | SNDRV_PCM_FMTBIT_S24_BE)



#ifdef CONFIG_I2C

#ifdef USE_I2C



/* CS4270 registers addresses */

#define CS4270_CHIPID	0x01	/* Chip ID */
@@ -141,7 +288,7 @@ static int cs4270_fill_cache(struct snd_soc_codec *codec) 
		CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache);



	if (length != CS4270_NUMREGS) {

		printk(KERN_ERR "cs4270: I2C read failure, addr=%u\n",

		printk(KERN_ERR "cs4270: I2C read failure, addr=0x%x\n",

		       i2c_client->addr);

		return -EIO;

	}
@@ -189,13 +336,14 @@ static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg, 
		cache[reg - CS4270_FIRSTREG] = value;

		return 0;

	} else {

		printk(KERN_ERR "cs4270: I2C write failed\n");

		printk(KERN_ERR "cs4270: I2C write of register %u failed\n",

			reg);

		return -EIO;

	}

}



/*

 * Clock Ratio Selection for Master Mode.

 * Clock Ratio Selection for Master Mode with I2C enabled

 *

 * The data for this chart is taken from Table 5 of the CS4270 reference

 * manual.
@@ -204,10 +352,8 @@ static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg, 
 * It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling

 * rates the CS4270 currently supports.

 *

 * 'ratio' is the MCLK/LRCK ratio.  MCLK is usually a fixed input frequency,

 * and LRCK is equal to the sampling rate. The CS4270 only supports sampling

 * rates where this ratio is one of: 64, 96, 128, 192, 256, 384, 512, 768 or

 * 1024.

 * 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
@@ -227,21 +373,20 @@ static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg, 
 * never select any sample rates that require divide-by-1.5.

 */

static struct {

	unsigned int ratio;

	u8 speed_mode;

	u8 mclk;

} cs4270_mode_ratios[] = {

	{64, CS4270_MODE_4X, CS4270_MODE_DIV1},

} cs4270_mode_ratios[NUM_MCLK_RATIOS] = {

	{CS4270_MODE_4X, CS4270_MODE_DIV1},	/* 64 */

#ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA

	{96, CS4270_MODE_4X, CS4270_MODE_DIV15},

	{CS4270_MODE_4X, CS4270_MODE_DIV15},    /* 96 */

#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}

	{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 */

};



/*
@@ -270,12 +415,12 @@ static int cs4270_hw_params(struct snd_pcm_substream *substream, 
	rate = params_rate(params);	/* Sampling rate, in Hz */

	ratio = cs4270->mclk / rate;	/* MCLK/LRCK ratio */



	for (i = 0; i < ARRAY_SIZE(cs4270_mode_ratios); i++) {

		if (cs4270_mode_ratios[i].ratio == ratio)

	for (i = 0; i < NUM_MCLK_RATIOS; i++) {

		if (mclk_ratios[i] == ratio)

			break;

	}



	if (i == ARRAY_SIZE(cs4270_mode_ratios)) {

	if (i == NUM_MCLK_RATIOS) {

		/* We did not find a matching ratio */

		printk(KERN_ERR "cs4270: could not find matching ratio\n");

		return -EINVAL;
@@ -377,126 +522,6 @@ static int cs4270_mute(struct snd_soc_codec_dai *dai, int mute) 


#endif



/*

 * Sampling rate <-> bit patter mapping

 *

 * This array maps sampling rates to their SNDRV_PCM_RATE_x equivalent.

 *

 * This is really something that ALSA should provide.

 *

 * This table is used by cs4270_set_dai_sysclk() to tell ALSA which sampling

 * rates the CS4270 currently supports.

 */

static struct {

	unsigned int rate;

	unsigned int bit;

} rate_map[] = {

	{5512, SNDRV_PCM_RATE_5512},

	{8000, SNDRV_PCM_RATE_8000},

	{11025, SNDRV_PCM_RATE_11025},

	{16000, SNDRV_PCM_RATE_16000},

	{22050, SNDRV_PCM_RATE_22050},

	{32000, SNDRV_PCM_RATE_32000},

	{44100, SNDRV_PCM_RATE_44100},

	{48000, SNDRV_PCM_RATE_48000},

	{64000, SNDRV_PCM_RATE_64000},

	{88200, SNDRV_PCM_RATE_88200},

	{96000, SNDRV_PCM_RATE_96000},

	{176400, SNDRV_PCM_RATE_176400},

	{192000, SNDRV_PCM_RATE_192000}

};



/*

 * 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.

 */

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 < ARRAY_SIZE(cs4270_mode_ratios); i++) {

		unsigned int rate;

		unsigned int j;

		rate = freq / cs4270_mode_ratios[i].ratio;

		for (j = 0; j < ARRAY_SIZE(rate_map); j++) {

			if (rate == rate_map[j].rate) {

				rates |= rate_map[j].bit;

				if (rate < rate_min)

					rate_min = rate;

				if (rate > rate_max)

					rate_max = rate;

			}

		}

	}



	if (!rate_max) {

		printk(KERN_ERR "cs4270: could not find a valid 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;

}



static int cs4270_i2c_probe(struct i2c_adapter *adap, int addr, int kind);



/*
@@ -740,7 +765,7 @@ static int cs4270_probe(struct platform_device *pdev) 
		return ret;

	}



#ifdef CONFIG_I2C

#ifdef USE_I2C

	cs4270_socdev = socdev;



	ret = i2c_add_driver(&cs4270_i2c_driver);
@@ -780,7 +805,7 @@ static int cs4270_remove(struct platform_device *pdev) 


	snd_soc_free_pcms(socdev);



#ifdef CONFIG_I2C

#ifdef USE_I2C

	if (socdev->codec->control_data)

		i2c_del_driver(&cs4270_i2c_driver);

#endif

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