diff options
| -rw-r--r-- | sound/soc/codecs/cs4270.c | 319 |
1 files changed, 172 insertions, 147 deletions
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c index b659a5d..8beae65 100644 --- a/sound/soc/codecs/cs4270.c +++ b/sound/soc/codecs/cs4270.c @@ -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 |
