*
* 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
#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.
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 */
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;
}
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.
* 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
* 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 */
};
/*
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;
#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);
/*
return ret;
}
-#ifdef CONFIG_I2C
+#ifdef USE_I2C
cs4270_socdev = socdev;
ret = i2c_add_driver(&cs4270_i2c_driver);
snd_soc_free_pcms(socdev);
-#ifdef CONFIG_I2C
+#ifdef USE_I2C
if (socdev->codec->control_data)
i2c_del_driver(&cs4270_i2c_driver);
#endif
projects / linux-2.6 / commitdiff