mirror of https://gitee.com/openkylin/linux.git
[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: Timur Tabi <timur@freescale.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Timur Tabi
Jaroslav Kysela
parent
b0c813ceee
commit
9dbd627b50
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@ -12,9 +12,11 @@
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*
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* Current features/limitations:
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*
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* 1) Stand-alone and software mode is supported. Stand-alone is
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* automatically selected if I2C is disabled or if a CS4270 is not found
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* on the I2C bus.
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* 1) Software mode is supported. Stand-alone mode is automatically
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* selected if I2C is disabled or if a CS4270 is not found on the I2C
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* bus. However, stand-alone mode is only partially implemented because
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* there is no mechanism yet for this driver and the machine driver to
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* communicate the values of the M0, M1, MCLK1, and MCLK2 pins.
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* 2) Only I2C is supported, not SPI
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* 3) Only Master mode is supported, not Slave.
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* 4) The machine driver's 'startup' function must call
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@ -34,12 +36,157 @@
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#include "cs4270.h"
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/* If I2C is defined, then we support software mode. However, if we're
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not compiled as module but I2C is, then we can't use I2C calls. */
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#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
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#define USE_I2C
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#endif
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/* Private data for the CS4270 */
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struct cs4270_private {
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unsigned int mclk; /* Input frequency of the MCLK pin */
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unsigned int mode; /* The mode (I2S or left-justified) */
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};
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/* The number of MCLK/LRCK ratios supported by the CS4270 */
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#define NUM_MCLK_RATIOS 9
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/* The actual MCLK/LRCK ratios, in increasing numerical order */
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static unsigned int mclk_ratios[NUM_MCLK_RATIOS] =
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{64, 96, 128, 192, 256, 384, 512, 768, 1024};
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/*
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* Sampling rate <-> bit patter mapping
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*
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* This array maps sampling rates to their SNDRV_PCM_RATE_x equivalent.
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*
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* This is really something that ALSA should provide.
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*
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* This table is used by cs4270_set_dai_sysclk() to tell ALSA which sampling
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* rates the CS4270 currently supports.
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*/
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static struct {
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unsigned int rate;
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unsigned int bit;
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} rate_map[] = {
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{5512, SNDRV_PCM_RATE_5512},
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{8000, SNDRV_PCM_RATE_8000},
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{11025, SNDRV_PCM_RATE_11025},
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{16000, SNDRV_PCM_RATE_16000},
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{22050, SNDRV_PCM_RATE_22050},
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{32000, SNDRV_PCM_RATE_32000},
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{44100, SNDRV_PCM_RATE_44100},
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{48000, SNDRV_PCM_RATE_48000},
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{64000, SNDRV_PCM_RATE_64000},
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{88200, SNDRV_PCM_RATE_88200},
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{96000, SNDRV_PCM_RATE_96000},
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{176400, SNDRV_PCM_RATE_176400},
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{192000, SNDRV_PCM_RATE_192000}
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};
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/*
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* Determine the CS4270 samples rates.
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*
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* 'freq' is the input frequency to MCLK. The other parameters are ignored.
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*
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* The value of MCLK is used to determine which sample rates are supported
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* by the CS4270. The ratio of MCLK / Fs must be equal to one of nine
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* support values: 64, 96, 128, 192, 256, 384, 512, 768, and 1024.
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*
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* This function calculates the nine ratios and determines which ones match
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* a standard sample rate. If there's a match, then it is added to the list
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* of support sample rates.
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*
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* This function must be called by the machine driver's 'startup' function,
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* otherwise the list of supported sample rates will not be available in
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* time for ALSA.
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*
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* Note that in stand-alone mode, the sample rate is determined by input
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* pins M0, M1, MDIV1, and MDIV2. Also in stand-alone mode, divide-by-3
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* is not a programmable option. However, divide-by-3 is not an available
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* option in stand-alone mode. This cases two problems: a ratio of 768 is
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* not available (it requires divide-by-3) and B) ratios 192 and 384 can
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* only be selected with divide-by-1.5, but there is an errate that make
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* this selection difficult.
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*
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* In addition, there is no mechanism for communicating with the machine
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* driver what the input settings can be. This would need to be implemented
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* for stand-alone mode to work.
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*/
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static int cs4270_set_dai_sysclk(struct snd_soc_codec_dai *codec_dai,
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int clk_id, unsigned int freq, int dir)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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struct cs4270_private *cs4270 = codec->private_data;
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unsigned int rates = 0;
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unsigned int rate_min = -1;
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unsigned int rate_max = 0;
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unsigned int i;
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cs4270->mclk = freq;
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for (i = 0; i < NUM_MCLK_RATIOS; i++) {
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unsigned int rate;
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unsigned int j;
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rate = freq / mclk_ratios[i];
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for (j = 0; j < ARRAY_SIZE(rate_map); j++) {
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if (rate == rate_map[j].rate) {
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rates |= rate_map[j].bit;
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if (rate < rate_min)
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rate_min = rate;
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if (rate > rate_max)
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rate_max = rate;
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}
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}
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}
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if (!rates) {
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printk(KERN_ERR "cs4270: could not find a valid sample rate\n");
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return -EINVAL;
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}
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codec_dai->playback.rates = rates;
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codec_dai->playback.rate_min = rate_min;
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codec_dai->playback.rate_max = rate_max;
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codec_dai->capture.rates = rates;
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codec_dai->capture.rate_min = rate_min;
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codec_dai->capture.rate_max = rate_max;
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return 0;
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}
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/*
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* Configure the codec for the selected audio format
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*
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* This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the
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* codec accordingly.
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*
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* Currently, this function only supports SND_SOC_DAIFMT_I2S and
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* SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified
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* data for playback only, but ASoC currently does not support different
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* formats for playback vs. record.
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*/
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static int cs4270_set_dai_fmt(struct snd_soc_codec_dai *codec_dai,
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unsigned int format)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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struct cs4270_private *cs4270 = codec->private_data;
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int ret = 0;
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switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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case SND_SOC_DAIFMT_LEFT_J:
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cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
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break;
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default:
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printk(KERN_ERR "cs4270: invalid DAI format\n");
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ret = -EINVAL;
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}
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return ret;
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}
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/*
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* The codec isn't really big-endian or little-endian, since the I2S
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* interface requires data to be sent serially with the MSbit first.
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@ -53,7 +200,7 @@ struct cs4270_private {
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SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \
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SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
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#ifdef CONFIG_I2C
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#ifdef USE_I2C
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/* CS4270 registers addresses */
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#define CS4270_CHIPID 0x01 /* Chip ID */
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@ -141,7 +288,7 @@ static int cs4270_fill_cache(struct snd_soc_codec *codec)
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CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache);
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if (length != CS4270_NUMREGS) {
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printk(KERN_ERR "cs4270: I2C read failure, addr=%u\n",
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printk(KERN_ERR "cs4270: I2C read failure, addr=0x%x\n",
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i2c_client->addr);
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return -EIO;
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}
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@ -189,13 +336,14 @@ static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
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cache[reg - CS4270_FIRSTREG] = value;
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return 0;
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} else {
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printk(KERN_ERR "cs4270: I2C write failed\n");
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printk(KERN_ERR "cs4270: I2C write of register %u failed\n",
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reg);
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return -EIO;
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}
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}
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/*
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* Clock Ratio Selection for Master Mode.
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* Clock Ratio Selection for Master Mode with I2C enabled
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*
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* The data for this chart is taken from Table 5 of the CS4270 reference
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* manual.
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@ -204,10 +352,8 @@ static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
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* It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling
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* rates the CS4270 currently supports.
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*
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* 'ratio' is the MCLK/LRCK ratio. MCLK is usually a fixed input frequency,
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* and LRCK is equal to the sampling rate. The CS4270 only supports sampling
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* rates where this ratio is one of: 64, 96, 128, 192, 256, 384, 512, 768 or
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* 1024.
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* Each element in this array corresponds to the ratios in mclk_ratios[].
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* These two arrays need to be in sync.
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*
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* 'speed_mode' is the corresponding bit pattern to be written to the
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* MODE bits of the Mode Control Register
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@ -227,21 +373,20 @@ static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
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* never select any sample rates that require divide-by-1.5.
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*/
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static struct {
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unsigned int ratio;
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u8 speed_mode;
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u8 mclk;
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} cs4270_mode_ratios[] = {
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{64, CS4270_MODE_4X, CS4270_MODE_DIV1},
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} cs4270_mode_ratios[NUM_MCLK_RATIOS] = {
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{CS4270_MODE_4X, CS4270_MODE_DIV1}, /* 64 */
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#ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA
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{96, CS4270_MODE_4X, CS4270_MODE_DIV15},
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{CS4270_MODE_4X, CS4270_MODE_DIV15}, /* 96 */
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#endif
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{128, CS4270_MODE_2X, CS4270_MODE_DIV1},
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{192, CS4270_MODE_4X, CS4270_MODE_DIV3},
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{256, CS4270_MODE_1X, CS4270_MODE_DIV1},
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{384, CS4270_MODE_2X, CS4270_MODE_DIV3},
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{512, CS4270_MODE_1X, CS4270_MODE_DIV2},
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{768, CS4270_MODE_1X, CS4270_MODE_DIV3},
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{1024, CS4270_MODE_1X, CS4270_MODE_DIV4}
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{CS4270_MODE_2X, CS4270_MODE_DIV1}, /* 128 */
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{CS4270_MODE_4X, CS4270_MODE_DIV3}, /* 192 */
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{CS4270_MODE_1X, CS4270_MODE_DIV1}, /* 256 */
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{CS4270_MODE_2X, CS4270_MODE_DIV3}, /* 384 */
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{CS4270_MODE_1X, CS4270_MODE_DIV2}, /* 512 */
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{CS4270_MODE_1X, CS4270_MODE_DIV3}, /* 768 */
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{CS4270_MODE_1X, CS4270_MODE_DIV4} /* 1024 */
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};
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/*
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@ -270,12 +415,12 @@ static int cs4270_hw_params(struct snd_pcm_substream *substream,
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rate = params_rate(params); /* Sampling rate, in Hz */
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ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */
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for (i = 0; i < ARRAY_SIZE(cs4270_mode_ratios); i++) {
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if (cs4270_mode_ratios[i].ratio == ratio)
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for (i = 0; i < NUM_MCLK_RATIOS; i++) {
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if (mclk_ratios[i] == ratio)
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break;
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}
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if (i == ARRAY_SIZE(cs4270_mode_ratios)) {
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if (i == NUM_MCLK_RATIOS) {
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/* We did not find a matching ratio */
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printk(KERN_ERR "cs4270: could not find matching ratio\n");
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return -EINVAL;
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@ -377,126 +522,6 @@ static int cs4270_mute(struct snd_soc_codec_dai *dai, int mute)
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#endif
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/*
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* Sampling rate <-> bit patter mapping
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*
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* This array maps sampling rates to their SNDRV_PCM_RATE_x equivalent.
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*
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* This is really something that ALSA should provide.
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*
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* This table is used by cs4270_set_dai_sysclk() to tell ALSA which sampling
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* rates the CS4270 currently supports.
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*/
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static struct {
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unsigned int rate;
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unsigned int bit;
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} rate_map[] = {
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{5512, SNDRV_PCM_RATE_5512},
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{8000, SNDRV_PCM_RATE_8000},
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{11025, SNDRV_PCM_RATE_11025},
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{16000, SNDRV_PCM_RATE_16000},
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{22050, SNDRV_PCM_RATE_22050},
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{32000, SNDRV_PCM_RATE_32000},
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{44100, SNDRV_PCM_RATE_44100},
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{48000, SNDRV_PCM_RATE_48000},
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{64000, SNDRV_PCM_RATE_64000},
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{88200, SNDRV_PCM_RATE_88200},
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{96000, SNDRV_PCM_RATE_96000},
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{176400, SNDRV_PCM_RATE_176400},
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{192000, SNDRV_PCM_RATE_192000}
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};
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/*
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* Determine the CS4270 samples rates.
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*
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* 'freq' is the input frequency to MCLK. The other parameters are ignored.
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*
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* The value of MCLK is used to determine which sample rates are supported
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* by the CS4270. The ratio of MCLK / Fs must be equal to one of nine
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* support values: 64, 96, 128, 192, 256, 384, 512, 768, and 1024.
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*
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* This function calculates the nine ratios and determines which ones match
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* a standard sample rate. If there's a match, then it is added to the list
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* of support sample rates.
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*
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* This function must be called by the machine driver's 'startup' function,
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* otherwise the list of supported sample rates will not be available in
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* time for ALSA.
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*/
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static int cs4270_set_dai_sysclk(struct snd_soc_codec_dai *codec_dai,
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int clk_id, unsigned int freq, int dir)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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struct cs4270_private *cs4270 = codec->private_data;
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unsigned int rates = 0;
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unsigned int rate_min = -1;
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unsigned int rate_max = 0;
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unsigned int i;
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cs4270->mclk = freq;
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for (i = 0; i < ARRAY_SIZE(cs4270_mode_ratios); i++) {
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unsigned int rate;
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unsigned int j;
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rate = freq / cs4270_mode_ratios[i].ratio;
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for (j = 0; j < ARRAY_SIZE(rate_map); j++) {
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if (rate == rate_map[j].rate) {
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rates |= rate_map[j].bit;
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if (rate < rate_min)
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rate_min = rate;
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if (rate > rate_max)
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rate_max = rate;
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}
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}
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}
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if (!rate_max) {
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printk(KERN_ERR "cs4270: could not find a valid rate\n");
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return -EINVAL;
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}
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codec_dai->playback.rates = rates;
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codec_dai->playback.rate_min = rate_min;
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codec_dai->playback.rate_max = rate_max;
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codec_dai->capture.rates = rates;
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codec_dai->capture.rate_min = rate_min;
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codec_dai->capture.rate_max = rate_max;
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return 0;
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}
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/*
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* Configure the codec for the selected audio format
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*
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* This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the
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* codec accordingly.
|
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*
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* Currently, this function only supports SND_SOC_DAIFMT_I2S and
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* SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified
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* data for playback only, but ASoC currently does not support different
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* formats for playback vs. record.
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*/
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static int cs4270_set_dai_fmt(struct snd_soc_codec_dai *codec_dai,
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unsigned int format)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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struct cs4270_private *cs4270 = codec->private_data;
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int ret = 0;
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switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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case SND_SOC_DAIFMT_LEFT_J:
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cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
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break;
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default:
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printk(KERN_ERR "cs4270: invalid DAI format\n");
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ret = -EINVAL;
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}
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return ret;
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}
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static int cs4270_i2c_probe(struct i2c_adapter *adap, int addr, int kind);
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/*
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@ -740,7 +765,7 @@ static int cs4270_probe(struct platform_device *pdev)
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return ret;
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}
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#ifdef CONFIG_I2C
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#ifdef USE_I2C
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cs4270_socdev = socdev;
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ret = i2c_add_driver(&cs4270_i2c_driver);
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@ -780,7 +805,7 @@ static int cs4270_remove(struct platform_device *pdev)
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snd_soc_free_pcms(socdev);
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#ifdef CONFIG_I2C
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#ifdef USE_I2C
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if (socdev->codec->control_data)
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i2c_del_driver(&cs4270_i2c_driver);
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#endif
|
||||
|
|
|
|||
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Reference in New Issue