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器件型号：TAS2505 大家好、我正在为 BeagleBone Black 和 Linux 开发应用、我需要将 BBB 连接到 TAS2505。
那么、这就是我到目前为止拥有的内容：
> Linux 4.19.129使用 Yocto 构建
> Tas2505驱动程序从这里删除： TI-tas2505-driver
>修复了上述驱动程序中的错误：
>tas2505.c 第37行：#if kernel_version (5、9、0)<= linux_version_code
>在内核 kconfig 和 Makefile 中修补了驱动程序(请参见随附的)diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig index efb095d..0da26ea 100644 --- a/sound/soc/codecs/Kconfig +++ b/sound/soc/codecs/Kconfig @@ -158,6 +158,7 @@ config SND_SOC_ALL_CODECS select SND_SOC_STAC9766 if SND_SOC_AC97_BUS select SND_SOC_STI_SAS select SND_SOC_TAS2552 if I2C + select SND_SOC_TAS2505 if I2C select SND_SOC_TAS5086 if I2C select SND_SOC_TAS571X if I2C select SND_SOC_TAS5720 if I2C @@ -958,6 +959,10 @@ config SND_SOC_TAS2552 tristate "Texas Instruments TAS2552 Mono Audio amplifier" depends on I2C +config SND_SOC_TAS2505 + tristate "Texas Instruments TAS2505 Mono Audio Amplifier for Automac" + depends on I2C + config SND_SOC_TAS5086 tristate "Texas Instruments TAS5086 speaker amplifier" depends on I2C diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile index 7ae7c85..e8d0d34 100644 --- a/sound/soc/codecs/Makefile +++ b/sound/soc/codecs/Makefile @@ -256,6 +256,7 @@ snd-soc-max98504-objs := max98504.o snd-soc-simple-amplifier-objs := simple-amplifier.o snd-soc-tpa6130a2-objs := tpa6130a2.o snd-soc-tas2552-objs := tas2552.o +snd-soc-tas2505-objs := tas2505.o obj-$(CONFIG_SND_SOC_88PM860X) += snd-soc-88pm860x.o obj-$(CONFIG_SND_SOC_AB8500_CODEC) += snd-soc-ab8500-codec.o @@ -428,6 +429,7 @@ obj-$(CONFIG_SND_SOC_STA529) += snd-soc-sta529.o obj-$(CONFIG_SND_SOC_STAC9766) += snd-soc-stac9766.o obj-$(CONFIG_SND_SOC_STI_SAS) += snd-soc-sti-sas.o obj-$(CONFIG_SND_SOC_TAS2552) += snd-soc-tas2552.o +obj-$(CONFIG_SND_SOC_TAS2505) += snd-soc-tas2505.o obj-$(CONFIG_SND_SOC_TAS5086) += snd-soc-tas5086.o obj-$(CONFIG_SND_SOC_TAS571X) += snd-soc-tas571x.o obj-$(CONFIG_SND_SOC_TAS5720) += snd-soc-tas5720.o diff --git a/sound/soc/codecs/tas2505.c b/sound/soc/codecs/tas2505.c new file mode 100644 index 0000000..20437b6 --- /dev/null +++ b/sound/soc/codecs/tas2505.c @@ -0,0 +1,857 @@ +/* + * ALSA SoC TAS2505 codec driver + * + * Author: Hieu Tran Dang <dangtranhieu2012@gmail.com> + * + * This package is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * THIS PACKAGE IS PROVIDED AS IS AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +/* + * Modificado por Fede 22/9/2022 +*/ +#include <linux/version.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/of_gpio.h> +#include <sound/soc.h> +#include <sound/tlv.h> +#include <sound/pcm_params.h> +#include "tas2505.h" + +static int tas2505_spkdrv_getvol(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_component *component = + snd_soc_kcontrol_component(kcontrol); + struct soc_mixer_control *mc = + (struct soc_mixer_control *)kcontrol->private_value; + unsigned int val; +#if KERNEL_VERSION(5, 9, 0) <= LINUX_VERSION_CODE + val = snd_soc_component_read(component, TAS2505_SPKVOL1); +#else + snd_soc_component_read(component, TAS2505_SPKVOL1, &val); +#endif + val = (val > mc->max) ? mc->max : val; + val = mc->invert ? mc->max - val : val; + ucontrol->value.integer.value[0] = val; + + return 0; +} + +static int tas2505_spkdrv_putvol(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_component *component = + snd_soc_kcontrol_component(kcontrol); + struct soc_mixer_control *mc = + (struct soc_mixer_control *)kcontrol->private_value; + u8 val; + + val = (ucontrol->value.integer.value[0] & 0x7f); + val = mc->invert ? mc->max - val : val; + val = (val < 0) ? 0 : val; + snd_soc_component_write(component, TAS2505_SPKVOL1, val); + + return 0; +} + +static const DECLARE_TLV_DB_SCALE(dac_vol_tlv, -6350, 50, 0); +static const DECLARE_TLV_DB_LINEAR(spk_drv_vol_tlv, TLV_DB_GAIN_MUTE, 0); +static const DECLARE_TLV_DB_SCALE(spk_amp_vol_tlv, 0, 600, 1); + +static const struct snd_kcontrol_new tas2505_snd_controls[] = { + SOC_SINGLE_S8_TLV("DAC Playback Volume", TAS2505_DACVOL, + -127, 48, dac_vol_tlv), + SOC_SINGLE_RANGE_EXT_TLV("Speaker Driver Volume", TAS2505_SPKVOL1, + 0, 0, 117, 1, + tas2505_spkdrv_getvol, tas2505_spkdrv_putvol, spk_drv_vol_tlv), + SOC_SINGLE_TLV("Speaker Amplifer Volume", TAS2505_SPKVOL2, + 4, 5, 0, spk_amp_vol_tlv), +}; + +static const struct snd_soc_dapm_widget tas2505_dapm_widgets[] = { + SND_SOC_DAPM_DAC("DAC Channel", "Playback", + TAS2505_DACSETUP1, 7, 0), + SND_SOC_DAPM_OUT_DRV("Speaker Driver", TAS2505_SPKAMPCTRL1, + 1, 0, NULL, 0), + SND_SOC_DAPM_OUTPUT("Speaker"), +}; + +static const struct snd_soc_dapm_route tas2505_audio_map[] = { + { "Speaker Driver", NULL, "DAC Channel" }, + { "Speaker", NULL, "Speaker Driver" }, +}; + +static const struct reg_default tas2505_reg_defaults[] = { + { TAS2505_CLKMUX, 0x00 }, + { TAS2505_PLLPR, 0x11 }, + { TAS2505_PLLJ, 0x04 }, + { TAS2505_PLLDMSB, 0x00 }, + { TAS2505_PLLDLSB, 0x00 }, + { TAS2505_NDAC, 0x01 }, + { TAS2505_MDAC, 0x01 }, + { TAS2505_DOSRMSB, 0x00 }, + { TAS2505_DOSRLSB, 0x80 }, + { TAS2505_IFACE1, 0x00 }, + { TAS2505_IFACE3, 0x00 }, + { TAS2505_DACSETUP1, 0x14 }, + { TAS2505_DACSETUP2, 0x0c }, + { TAS2505_DACVOL, 0x00 }, + { TAS2505_REF_POR_LDO_BGAP_CTRL, 0x00 }, + { TAS2505_LDO_CTRL, 0x0c }, + { TAS2505_SPKAMPCTRL1, 0x00 }, + { TAS2505_SPKVOL1, 0x00 }, + { TAS2505_SPKVOL2, 0x00 }, + { TAS2505_DACFLAG1, 0x00 }, + { TAS2505_DACFLAG2, 0x00 }, + { TAS2505_STICKYFLAG1, 0x00 }, + { TAS2505_STICKYFLAG2, 0x00 }, + { TAS2505_INTFLAG1, 0x00 }, + { TAS2505_INTFLAG2, 0x00 }, + { TAS2505_DACANLGAINFLAG, 0x00 }, +}; + +static bool tas2505_volatile(struct device *dev, unsigned int reg) +{ + switch (reg) { + case TAS2505_PAGECTL: + case TAS2505_RESET: + case TAS2505_DACFLAG1: + case TAS2505_DACFLAG2: + case TAS2505_STICKYFLAG1: + case TAS2505_STICKYFLAG2: + case TAS2505_INTFLAG1: + case TAS2505_INTFLAG2: + case TAS2505_DACANLGAINFLAG: + return true; + } + return false; +} + +static bool tas2505_writeable(struct device *dev, unsigned int reg) +{ + switch (reg) { + case TAS2505_DACFLAG1: + case TAS2505_DACFLAG2: + case TAS2505_STICKYFLAG1: + case TAS2505_STICKYFLAG2: + case TAS2505_INTFLAG1: + case TAS2505_INTFLAG2: + case TAS2505_DACANLGAINFLAG: + return false; + } + return true; +} + +static const struct regmap_range_cfg tas2505_ranges[] = { + { + .range_min = 0, + .range_max = 69 * 128, + .selector_reg = TAS2505_PAGECTL, + .selector_mask = 0xff, + .selector_shift = 0, + .window_start = 0, + .window_len = 128, + }, +}; + +static const struct regmap_config tas2505_i2c_regmap = { + .reg_bits = 8, + .val_bits = 8, + .writeable_reg = tas2505_writeable, + .volatile_reg = tas2505_volatile, + .reg_defaults = tas2505_reg_defaults, + .num_reg_defaults = ARRAY_SIZE(tas2505_reg_defaults), + .cache_type = REGCACHE_RBTREE, + .ranges = tas2505_ranges, + .num_ranges = ARRAY_SIZE(tas2505_ranges), + .max_register = 69 * 128, +}; + +struct tas2505_rate_divs { + u32 mclk_p; + u32 rate; + u8 pll_r; + u8 pll_j; + u16 pll_d; + u8 mdac; + u8 ndac; + u16 dosr; +}; + +static const struct tas2505_rate_divs tas2505_divs[] = { + { 12288000, 44100, 1, 7, 35, 4, 4, 128 }, + { 12288000, 48000, 1, 7, 0, 7, 2, 128 }, +}; + +struct tas2505_priv { + void *codec; + struct device *dev; + struct regmap *regmap; + u32 sysclk; + u8 p_div; + int rate_div_line; +}; + +#if KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE +static int tas2505_setup_pll(struct snd_soc_component *codec, + struct snd_pcm_hw_params *params) +{ + struct tas2505_priv *tas2505 = snd_soc_component_get_drvdata(codec); + int mclk_p = tas2505->sysclk / tas2505->p_div; + int match = -1; + u8 p_div; + int i; + + for (i = 0; i < ARRAY_SIZE(tas2505_divs); i++) { + if ( + tas2505_divs[i].rate == params_rate(params) && + tas2505_divs[i].mclk_p == mclk_p + ) { + match = i; + break; + } + } + + if (match == -1) { + dev_err(codec->dev, + "Sample rate (%u), sysclk (%u), div (%u) and format not supported\n", + params_rate(params), tas2505->sysclk, tas2505->p_div); + return -EINVAL; + } + + tas2505->rate_div_line = match; + + p_div = (tas2505->p_div == 8) ? 0 : tas2505->p_div; + p_div <<= TAS2505_PLLPR_P_SHIFT; + + snd_soc_component_update_bits(codec, TAS2505_PLLPR, TAS2505_PLLPR_P_MASK, + p_div); + snd_soc_component_update_bits(codec, TAS2505_PLLPR, TAS2505_PLLPR_R_MASK, + tas2505_divs[match].pll_r); + snd_soc_component_write(codec, TAS2505_PLLJ, tas2505_divs[match].pll_j); + snd_soc_component_write(codec, TAS2505_PLLDMSB, tas2505_divs[match].pll_d >> 8); + snd_soc_component_write(codec, TAS2505_PLLDLSB, tas2505_divs[match].pll_d & 0xff); + snd_soc_component_update_bits(codec, TAS2505_NDAC, TAS2505_PLL_DAC_MASK, + tas2505_divs[match].ndac); + snd_soc_component_update_bits(codec, TAS2505_MDAC, TAS2505_PLL_DAC_MASK, + tas2505_divs[match].mdac); + snd_soc_component_write(codec, TAS2505_DOSRMSB, tas2505_divs[match].dosr >> 8); + snd_soc_component_write(codec, TAS2505_DOSRLSB, tas2505_divs[match].dosr & 0xff); + snd_soc_component_update_bits(codec, TAS2505_BCLKNDIV, TAS2505_BCLKNDIV_MASK, + (tas2505_divs[match].dosr * tas2505_divs[match].mdac) / snd_soc_params_to_frame_size(params)); + + return 0; +} + +static int tas2505_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) +{ + struct snd_soc_component *codec = dai->component; + u8 data = 0; + + switch (params_width(params)) { + case 16: + break; + + case 20: + data = TAS2505_WORD_LEN_20BITS; + break; + + case 24: + data = TAS2505_WORD_LEN_24BITS; + break; + + case 32: + data = TAS2505_WORD_LEN_32BITS; + break; + + default: + dev_err(codec->dev, "Unsupported width %d\n", + params_width(params)); + return -EINVAL; + } + + data <<= TAS2505_IFACE1_DATALEN_SHIFT; + + snd_soc_component_update_bits(codec, TAS2505_IFACE1, + TAS2505_IFACE1_DATALEN_MASK, data); + + return tas2505_setup_pll(codec, params); +} + +static int tas2505_dac_mute(struct snd_soc_dai *dai, int mute, int stream) +{ + struct snd_soc_component *codec = dai->component; + + if (mute) { + snd_soc_component_update_bits(codec, TAS2505_DACSETUP2, + TAS2505_DACSETUP2_MUTE_MASK, + TAS2505_DACSETUP2_MUTE_MASK); + } else { + snd_soc_component_update_bits(codec, TAS2505_DACSETUP2, + TAS2505_DACSETUP2_MUTE_MASK, 0x0); + } + + return 0; +} + +static int tas2505_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) +{ + struct snd_soc_component *codec = codec_dai->component; + u8 iface_reg1 = 0; + u8 iface_reg3 = 0; + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBS_CFS: + break; + + case SND_SOC_DAIFMT_CBM_CFM: + iface_reg1 |= TAS2505_IFACE1_BCLKDIR_MASK; + iface_reg1 |= TAS2505_IFACE1_WCLKDIR_MASK; + break; + + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + break; + + case SND_SOC_DAIFMT_IB_NF: + iface_reg3 |= TAS2505_IFACE3_BCLKINV_MASK; + break; + + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + break; + + case SND_SOC_DAIFMT_DSP_A: + case SND_SOC_DAIFMT_DSP_B: + iface_reg1 |= (TAS2505_DSP_MODE << + TAS2505_IFACE1_INTERFACE_SHIFT); + break; + + case SND_SOC_DAIFMT_RIGHT_J: + iface_reg1 |= (TAS2505_RJF_MODE << + TAS2505_IFACE1_INTERFACE_SHIFT); + break; + + case SND_SOC_DAIFMT_LEFT_J: + iface_reg1 |= (TAS2505_LJF_MODE << + TAS2505_IFACE1_INTERFACE_SHIFT); + break; + + default: + dev_err(codec->dev, "Invalid DAI interface format\n"); + return -EINVAL; + } + + snd_soc_component_write(codec, TAS2505_IFACE1, iface_reg1); + snd_soc_component_update_bits(codec, TAS2505_IFACE3, + TAS2505_IFACE3_BCLKINV_MASK | TAS2505_IFACE3_BDIVCLKIN_MASK, + iface_reg3); + + return 0; +} + +static int tas2505_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id, + unsigned int freq, int dir) +{ + struct snd_soc_component *codec = codec_dai->component; + struct tas2505_priv *tas2505 = snd_soc_component_get_drvdata(codec); + int i, x; + + dev_dbg(tas2505->dev, "clk_id: %d, freq: %d\n", clk_id, freq); + + for (i = 0; i < ARRAY_SIZE(tas2505_divs); i++) { + for (x = 1; x < 9; x++) { + if ((freq / x) == tas2505_divs[i].mclk_p) { + tas2505->p_div = x; + goto found_p_div; + } + } + } + + dev_err(tas2505->dev, "Can't produce required PLL_CLKIN frequency\n"); + return -EINVAL; + +found_p_div: + snd_soc_component_write(codec, TAS2505_CLKMUX, + (clk_id << TAS2505_PLL_CLKIN_SHIFT) | TAS2505_CODEC_CLKIN_PLL); + + tas2505->sysclk = freq; + + return 0; +} + +static void tas2505_clk_on(struct snd_soc_component *codec) +{ + u8 mask = TAS2505_PM_MASK; + u8 on = TAS2505_PM_MASK; + + snd_soc_component_update_bits(codec, TAS2505_PLLPR, mask, on); + mdelay(15); + snd_soc_component_update_bits(codec, TAS2505_NDAC, mask, on); + snd_soc_component_update_bits(codec, TAS2505_MDAC, mask, on); + snd_soc_component_update_bits(codec, TAS2505_BCLKNDIV, mask, on); +} + +static void tas2505_clk_off(struct snd_soc_component *codec) +{ + u8 mask = TAS2505_PM_MASK; + + snd_soc_component_update_bits(codec, TAS2505_BCLKNDIV, mask, 0); + snd_soc_component_update_bits(codec, TAS2505_MDAC, mask, 0); + snd_soc_component_update_bits(codec, TAS2505_NDAC, mask, 0); + snd_soc_component_update_bits(codec, TAS2505_PLLPR, mask, 0); +} + +static void tas2505_power_on(struct snd_soc_component *codec) +{ + snd_soc_component_write(codec, TAS2505_RESET, 1); + usleep_range(500, 1000); + snd_soc_component_update_bits(codec, TAS2505_LDO_CTRL, + TAS2505_LDO_PLL_HP_LVL_MASK, 0); + snd_soc_component_update_bits(codec, TAS2505_REF_POR_LDO_BGAP_CTRL, + TAS2505_REF_POR_LDO_BGAP_MASTER_REF_MASK, + TAS2505_REF_POR_LDO_BGAP_MASTER_REF_MASK); +} + +static void tas2505_power_off(struct snd_soc_component *codec) +{ + snd_soc_component_update_bits(codec, TAS2505_REF_POR_LDO_BGAP_CTRL, + TAS2505_REF_POR_LDO_BGAP_MASTER_REF_MASK, 0); + snd_soc_component_update_bits(codec, TAS2505_LDO_CTRL, + TAS2505_LDO_PLL_HP_LVL_MASK, + TAS2505_LDO_PLL_HP_LVL_MASK); +} +#else +static int tas2505_setup_pll(struct snd_soc_codec *codec, + struct snd_pcm_hw_params *params) +{ + struct tas2505_priv *tas2505 = snd_soc_codec_get_drvdata(codec); + int mclk_p = tas2505->sysclk / tas2505->p_div; + int match = -1; + u8 p_div; + int i; + + for (i = 0; i < ARRAY_SIZE(tas2505_divs); i++) { + if ( + tas2505_divs[i].rate == params_rate(params) && + tas2505_divs[i].mclk_p == mclk_p + ) { + match = i; + break; + } + } + + if (match == -1) { + dev_err(codec->dev, + "Sample rate (%u) and format not supported\n", + params_rate(params)); + return -EINVAL; + } + + tas2505->rate_div_line = match; + + p_div = (tas2505->p_div == 8) ? 0 : tas2505->p_div; + p_div <<= TAS2505_PLLPR_P_SHIFT; + + snd_soc_update_bits(codec, TAS2505_PLLPR, TAS2505_PLLPR_P_MASK, + p_div); + snd_soc_update_bits(codec, TAS2505_PLLPR, TAS2505_PLLPR_R_MASK, + tas2505_divs[match].pll_r); + snd_soc_write(codec, TAS2505_PLLJ, tas2505_divs[match].pll_j); + snd_soc_write(codec, TAS2505_PLLDMSB, tas2505_divs[match].pll_d >> 8); + snd_soc_write(codec, TAS2505_PLLDLSB, tas2505_divs[match].pll_d & 0xff); + snd_soc_update_bits(codec, TAS2505_NDAC, TAS2505_PLL_DAC_MASK, + tas2505_divs[match].ndac); + snd_soc_update_bits(codec, TAS2505_MDAC, TAS2505_PLL_DAC_MASK, + tas2505_divs[match].mdac); + snd_soc_write(codec, TAS2505_DOSRMSB, tas2505_divs[match].dosr >> 8); + snd_soc_write(codec, TAS2505_DOSRLSB, tas2505_divs[match].dosr & 0xff); + snd_soc_update_bits(codec, TAS2505_BCLKNDIV, TAS2505_BCLKNDIV_MASK, + (tas2505_divs[match].dosr * tas2505_divs[match].mdac) / snd_soc_params_to_frame_size(params)); + + return 0; +} + +static int tas2505_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) +{ + struct snd_soc_codec *codec = dai->codec; + u8 data = 0; + + switch (params_width(params)) { + case 16: + break; + + case 20: + data = TAS2505_WORD_LEN_20BITS; + break; + + case 24: + data = TAS2505_WORD_LEN_24BITS; + break; + + case 32: + data = TAS2505_WORD_LEN_32BITS; + break; + + default: + dev_err(codec->dev, "Unsupported width %d\n", + params_width(params)); + return -EINVAL; + } + + data <<= TAS2505_IFACE1_DATALEN_SHIFT; + + snd_soc_update_bits(codec, TAS2505_IFACE1, + TAS2505_IFACE1_DATALEN_MASK, data); + + return tas2505_setup_pll(codec, params); +} + +static int tas2505_dac_mute(struct snd_soc_dai *codec_dai, int mute, int stream) +{ + struct snd_soc_codec *codec = codec_dai->codec; + + if (mute) { + snd_soc_update_bits(codec, TAS2505_DACSETUP2, + TAS2505_DACSETUP2_MUTE_MASK, + TAS2505_DACSETUP2_MUTE_MASK); + } else { + snd_soc_update_bits(codec, TAS2505_DACSETUP2, + TAS2505_DACSETUP2_MUTE_MASK, 0x0); + } + + return 0; +} + +static int tas2505_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) +{ + struct snd_soc_codec *codec = codec_dai->codec; + u8 iface_reg1 = 0; + u8 iface_reg3 = 0; + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBS_CFS: + break; + + case SND_SOC_DAIFMT_CBM_CFM: + iface_reg1 |= TAS2505_IFACE1_BCLKDIR_MASK; + iface_reg1 |= TAS2505_IFACE1_WCLKDIR_MASK; + break; + + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + break; + + case SND_SOC_DAIFMT_IB_NF: + iface_reg3 |= TAS2505_IFACE3_BCLKINV_MASK; + break; + + default: + return -EINVAL; + } + + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + break; + + case SND_SOC_DAIFMT_DSP_A: + case SND_SOC_DAIFMT_DSP_B: + iface_reg1 |= (TAS2505_DSP_MODE << + TAS2505_IFACE1_INTERFACE_SHIFT); + break; + + case SND_SOC_DAIFMT_RIGHT_J: + iface_reg1 |= (TAS2505_RJF_MODE << + TAS2505_IFACE1_INTERFACE_SHIFT); + break; + + case SND_SOC_DAIFMT_LEFT_J: + iface_reg1 |= (TAS2505_LJF_MODE << + TAS2505_IFACE1_INTERFACE_SHIFT); + break; + + default: + dev_err(codec->dev, "Invalid DAI interface format\n"); + return -EINVAL; + } + + snd_soc_write(codec, TAS2505_IFACE1, iface_reg1); + snd_soc_update_bits(codec, TAS2505_IFACE3, + TAS2505_IFACE3_BCLKINV_MASK | TAS2505_IFACE3_BDIVCLKIN_MASK, + iface_reg3); + + return 0; +} + +static int tas2505_set_dai_sysclk(struct snd_soc_dai *codec_dai, int clk_id, + unsigned int freq, int dir) +{ + struct snd_soc_codec *codec = codec_dai->codec; + struct tas2505_priv *tas2505 = snd_soc_codec_get_drvdata(codec); + int i, x; + + dev_dbg(tas2505->dev, "clk_id: %d, freq: %d\n", clk_id, freq); + + for (i = 0; i < ARRAY_SIZE(tas2505_divs); i++) { + for (x = 1; x < 9; x++) { + if ((freq / x) == tas2505_divs[i].mclk_p) { + tas2505->p_div = x; + goto found_p_div; + } + } + } + + dev_err(tas2505->dev, "Can't produce required PLL_CLKIN frequency\n"); + return -EINVAL; + +found_p_div: + snd_soc_write(codec, TAS2505_CLKMUX, + (clk_id << TAS2505_PLL_CLKIN_SHIFT) | TAS2505_CODEC_CLKIN_PLL); + + tas2505->sysclk = freq; + + return 0; +} + +static void tas2505_clk_on(struct snd_soc_codec *codec) +{ + u8 mask = TAS2505_PM_MASK; + u8 on = TAS2505_PM_MASK; + + snd_soc_update_bits(codec, TAS2505_PLLPR, mask, on); + mdelay(15); + snd_soc_update_bits(codec, TAS2505_NDAC, mask, on); + snd_soc_update_bits(codec, TAS2505_MDAC, mask, on); + snd_soc_update_bits(codec, TAS2505_BCLKNDIV, mask, on); +} + +static void tas2505_clk_off(struct snd_soc_codec *codec) +{ + u8 mask = TAS2505_PM_MASK; + + snd_soc_update_bits(codec, TAS2505_BCLKNDIV, mask, 0); + snd_soc_update_bits(codec, TAS2505_MDAC, mask, 0); + snd_soc_update_bits(codec, TAS2505_NDAC, mask, 0); + snd_soc_update_bits(codec, TAS2505_PLLPR, mask, 0); +} + +static void tas2505_power_on(struct snd_soc_codec *codec) +{ + snd_soc_write(codec, TAS2505_RESET, 1); + usleep_range(500, 1000); + snd_soc_update_bits(codec, TAS2505_LDO_CTRL, + TAS2505_LDO_PLL_HP_LVL_MASK, 0); + snd_soc_update_bits(codec, TAS2505_REF_POR_LDO_BGAP_CTRL, + TAS2505_REF_POR_LDO_BGAP_MASTER_REF_MASK, + TAS2505_REF_POR_LDO_BGAP_MASTER_REF_MASK); +} + +static void tas2505_power_off(struct snd_soc_codec *codec) +{ + snd_soc_update_bits(codec, TAS2505_REF_POR_LDO_BGAP_CTRL, + TAS2505_REF_POR_LDO_BGAP_MASTER_REF_MASK, 0); + snd_soc_update_bits(codec, TAS2505_LDO_CTRL, + TAS2505_LDO_PLL_HP_LVL_MASK, + TAS2505_LDO_PLL_HP_LVL_MASK); +} +#endif + +#if KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE +static int tas2505_set_bias_level(struct snd_soc_component *codec, + enum snd_soc_bias_level level) +{ + int current_lvl = snd_soc_component_get_bias_level(codec); +#else +static int tas2505_set_bias_level(struct snd_soc_codec *codec, + enum snd_soc_bias_level level) +{ + int current_lvl = snd_soc_codec_get_bias_level(codec); +#endif + switch (level) { + case SND_SOC_BIAS_ON: + break; + case SND_SOC_BIAS_PREPARE: + if (current_lvl == SND_SOC_BIAS_STANDBY) + tas2505_clk_on(codec); + break; + case SND_SOC_BIAS_STANDBY: + if (current_lvl == SND_SOC_BIAS_OFF) + tas2505_power_on(codec); + else if (current_lvl == SND_SOC_BIAS_PREPARE) + tas2505_clk_off(codec); + else + BUG(); + break; + case SND_SOC_BIAS_OFF: + if (current_lvl == SND_SOC_BIAS_STANDBY) + tas2505_power_off(codec); + break; + default: + dev_err(codec->dev, "Invalid bias level\n"); + return -EINVAL; + } + + return 0; +} +#if KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE +static int tas2505_codec_probe(struct snd_soc_component *codec) +{ + struct tas2505_priv *tas2505 = snd_soc_component_get_drvdata(codec); +#else +static int tas2505_codec_probe(struct snd_soc_codec *codec) +{ + struct tas2505_priv *tas2505 = snd_soc_codec_get_drvdata(codec); +#endif + tas2505->codec = codec; + return 0; +} + +#if KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE +static struct snd_soc_component_driver soc_codec_driver_tas2505 = { + .probe = tas2505_codec_probe, + .set_bias_level = tas2505_set_bias_level, + .suspend_bias_off = true, + + .controls = tas2505_snd_controls, + .num_controls = ARRAY_SIZE(tas2505_snd_controls), + .dapm_widgets = tas2505_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(tas2505_dapm_widgets), + .dapm_routes = tas2505_audio_map, + .num_dapm_routes = ARRAY_SIZE(tas2505_audio_map), +}; +#else +static struct snd_soc_codec_driver soc_codec_driver_tas2505 = { + .probe = tas2505_codec_probe, + .set_bias_level = tas2505_set_bias_level, + .suspend_bias_off = true, + + .component_driver = { + .controls = tas2505_snd_controls, + .num_controls = ARRAY_SIZE(tas2505_snd_controls), + .dapm_widgets = tas2505_dapm_widgets, + .num_dapm_widgets = ARRAY_SIZE(tas2505_dapm_widgets), + .dapm_routes = tas2505_audio_map, + .num_dapm_routes = ARRAY_SIZE(tas2505_audio_map), + }, +}; +#endif + +static const struct snd_soc_dai_ops tas2505_dai_ops = { + .hw_params = tas2505_hw_params, + .set_sysclk = tas2505_set_dai_sysclk, + .set_fmt = tas2505_set_dai_fmt, + .mute_stream = tas2505_dac_mute, +}; + +static struct snd_soc_dai_driver tas2505_dai_driver[] = { + { + .name = "tas2505-hifi", + .playback = { + .stream_name = "Playback", + .channels_min = 1, + .channels_max = 2, + .rates = TAS2505_RATES, + .formats = TAS2505_FORMATS, + }, + .ops = &tas2505_dai_ops, + .symmetric_rates = 1, + }, +}; + +static int tas2505_i2c_probe(struct i2c_client *i2c, + const struct i2c_device_id *id) +{ + struct tas2505_priv *tas2505; + struct device_node *np = i2c->dev.of_node; + const struct regmap_config *regmap_config = &tas2505_i2c_regmap; + int ret; + + tas2505 = devm_kzalloc(&i2c->dev, sizeof(*tas2505), GFP_KERNEL); + if (tas2505 == NULL) + return -ENOMEM; + + tas2505->regmap = devm_regmap_init_i2c(i2c, regmap_config); + if (IS_ERR(tas2505->regmap)) { + ret = PTR_ERR(tas2505->regmap); + dev_err(&i2c->dev, "Failed to allocate register map: %d\n", + ret); + return ret; + } + + ret = of_get_named_gpio(np, "gpio-reset", 0); + if ((ret > 0) && gpio_is_valid(ret)) { + devm_gpio_request_one(&i2c->dev, ret, GPIOF_OUT_INIT_HIGH, "reset"); + } + + tas2505->dev = &i2c->dev; + + dev_set_drvdata(tas2505->dev, tas2505); +#if KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE + return snd_soc_register_component( &i2c->dev, &soc_codec_driver_tas2505, + tas2505_dai_driver, ARRAY_SIZE(tas2505_dai_driver)); +#else + return snd_soc_register_codec( &i2c->dev, &soc_codec_driver_tas2505, + tas2505_dai_driver, ARRAY_SIZE(tas2505_dai_driver)); +#endif +} + +static int tas2505_i2c_remove(struct i2c_client *i2c) +{ +#if KERNEL_VERSION(4, 19, 0) <= LINUX_VERSION_CODE + snd_soc_unregister_component(&i2c->dev); +#else + snd_soc_unregister_codec(&i2c->dev); +#endif + return 0; +} + +static const struct of_device_id tas2505_of_match[] = { + { .compatible = "ti,tas2505" }, + {}, +}; +MODULE_DEVICE_TABLE(of, tas2505_of_match); + +static const struct i2c_device_id tas2505_i2c_id[] = { + { "tas2505", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2ic, tas2505_i2c_id); + +static struct i2c_driver tas2505_i2c_driver = { + .driver = { + .name = "tas2505-codec", + .of_match_table = of_match_ptr(tas2505_of_match), + }, + .probe = tas2505_i2c_probe, + .remove = tas2505_i2c_remove, + .id_table = tas2505_i2c_id, +}; + +module_i2c_driver(tas2505_i2c_driver); + +MODULE_DESCRIPTION("ASoC TAS2505 codec driver"); +MODULE_AUTHOR("Hieu Tran Dang <dangtranhieu2012@gmail.com>"); +MODULE_LICENSE("GPL"); diff --git a/sound/soc/codecs/tas2505.h b/sound/soc/codecs/tas2505.h new file mode 100644 index 0000000..496574d --- /dev/null +++ b/sound/soc/codecs/tas2505.h @@ -0,0 +1,90 @@ +/* + * ALSA SoC TAS2505 codec driver + * + * Author: Hieu Tran Dang <dangtranhieu2012@gmail.com> + * + * This package is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * THIS PACKAGE IS PROVIDED AS IS AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#ifndef _TAS2505_H +#define _TAS2505_H + +#define TAS2505_RATES SNDRV_PCM_RATE_8000_96000 +#define TAS2505_FORMATS SNDRV_PCM_FMTBIT_S24_LE + +#define TAS2505_REG(page, reg) ((page * 128) + reg) + +#define TAS2505_PAGECTL TAS2505_REG(0, 0) +#define TAS2505_RESET TAS2505_REG(0, 1) +#define TAS2505_CLKMUX TAS2505_REG(0, 4) +#define TAS2505_PLLPR TAS2505_REG(0, 5) +#define TAS2505_PLLJ TAS2505_REG(0, 6) +#define TAS2505_PLLDMSB TAS2505_REG(0, 7) +#define TAS2505_PLLDLSB TAS2505_REG(0, 8) +#define TAS2505_NDAC TAS2505_REG(0, 11) +#define TAS2505_MDAC TAS2505_REG(0, 12) +#define TAS2505_DOSRMSB TAS2505_REG(0, 13) +#define TAS2505_DOSRLSB TAS2505_REG(0, 14) +#define TAS2505_IFACE1 TAS2505_REG(0, 27) +#define TAS2505_IFACE3 TAS2505_REG(0, 29) +#define TAS2505_BCLKNDIV TAS2505_REG(0, 30) +#define TAS2505_DACFLAG1 TAS2505_REG(0, 37) +#define TAS2505_DACFLAG2 TAS2505_REG(0, 38) +#define TAS2505_STICKYFLAG1 TAS2505_REG(0, 42) +#define TAS2505_INTFLAG1 TAS2505_REG(0, 43) +#define TAS2505_STICKYFLAG2 TAS2505_REG(0, 44) +#define TAS2505_INTFLAG2 TAS2505_REG(0, 46) +#define TAS2505_DACINSTRSET TAS2505_REG(0, 60) +#define TAS2505_DACSETUP1 TAS2505_REG(0, 63) +#define TAS2505_DACSETUP2 TAS2505_REG(0, 64) +#define TAS2505_DACVOL TAS2505_REG(0, 65) +#define TAS2505_REF_POR_LDO_BGAP_CTRL TAS2505_REG(1, 1) +#define TAS2505_LDO_CTRL TAS2505_REG(1, 2) +#define TAS2505_PLAYBACKCONF1 TAS2505_REG(1, 3) +#define TAS2505_SPKAMPCTRL1 TAS2505_REG(1, 45) +#define TAS2505_SPKVOL1 TAS2505_REG(1, 46) +#define TAS2505_SPKVOL2 TAS2505_REG(1, 48) +#define TAS2505_DACANLGAINFLAG TAS2505_REG(1, 63) + +#define TAS2505_PLLPR_P_MASK 0x70 +#define TAS2505_PLLPR_R_MASK 0xf +#define TAS2505_PLL_DAC_MASK 0x7f +#define TAS2505_BCLKNDIV_MASK 0x7f +#define TAS2505_IFACE1_DATALEN_MASK 0x30 +#define TAS2505_IFACE1_WCLKDIR_MASK 0x4 +#define TAS2505_IFACE1_BCLKDIR_MASK 0x8 +#define TAS2505_IFACE1_INTERFACE_MASK 0xc0 +#define TAS2505_IFACE3_BDIVCLKIN_MASK 0x1 +#define TAS2505_IFACE3_BCLKINV_MASK 0x8 +#define TAS2505_DACSETUP2_MUTE_MASK 0x8 +#define TAS2505_PM_MASK 0x80 +#define TAS2505_LDO_PLL_HP_LVL_MASK 0x8 +#define TAS2505_REF_POR_LDO_BGAP_MASTER_REF_MASK 0x10 + +#define TAS2505_PLLPR_P_SHIFT 4 +#define TAS2505_PLL_CLKIN_SHIFT 2 +#define TAS2505_IFACE1_DATALEN_SHIFT 4 +#define TAS2505_IFACE1_INTERFACE_SHIFT 6 +#define TAS2505_IFACE3_BCLKINV_SHIFT 4 + +#define TAS2505_WORD_LEN_20BITS 1 +#define TAS2505_WORD_LEN_24BITS 2 +#define TAS2505_WORD_LEN_32BITS 3 + +#define TAS2505_DSP_MODE 1 +#define TAS2505_RJF_MODE 2 +#define TAS2505_LJF_MODE 3 + +#define TAS2505_PLL_CLKIN_MCLK 0 +#define TAS2505_PLL_CLKIN_BCLK 1 +#define TAS2505_PLL_CLKIN_GPIO 2 +#define TAS2505_PLL_CLKIN_DIN 3 +#define TAS2505_CODEC_CLKIN_PLL 3 + +#endif
>我在内核 menuconfig 中启用了驱动程序
>已修补设备树以添加驱动程序(请参见附件)/* * 23/9/2022 * Ing. Federico Arias * Device tree para botonera y preasignador con pantalla HDMI * version 5 * configura señales de HDMI y audio por i2s */ /dts-v1/; #include "am33xx.dtsi" #include "am335x-bone-common.dtsi" #include <dt-bindings/display/tda998x.h> / { model = "TI AM335x BeagleBone Black"; compatible = "ti,am335x-bone-black", "ti,am335x-bone", "ti,am33xx"; }; &cpu0_opp_table { oppnitro-1000000000 { opp-supported-hw = <0x06 0x0100>; }; }; &ldo3_reg { regulator-min-microvolt = <1800000>; regulator-max-microvolt = <1800000>; regulator-always-on; }; &mmc1 { vmmc-supply = <&vmmcsd_fixed>; }; &mmc2 { vmmc-supply = <&vmmcsd_fixed>; pinctrl-names = "default"; pinctrl-0 = <&emmc_pins>; bus-width = <8>; status = "okay"; }; &am33xx_pinmux { nxp_hdmi_bonelt_pins: nxp_hdmi_bonelt_pins { pinctrl-single,pins = < AM33XX_IOPAD(0x9b0, PIN_OUTPUT_PULLDOWN | MUX_MODE3) /* xdma_event_intr0 */ AM33XX_IOPAD(0x8a0, PIN_OUTPUT | MUX_MODE0) /* lcd_data0.lcd_data0 */ AM33XX_IOPAD(0x8a4, PIN_OUTPUT | MUX_MODE0) /* lcd_data1.lcd_data1 */ AM33XX_IOPAD(0x8a8, PIN_OUTPUT | MUX_MODE0) /* lcd_data2.lcd_data2 */ AM33XX_IOPAD(0x8ac, PIN_OUTPUT | MUX_MODE0) /* lcd_data3.lcd_data3 */ AM33XX_IOPAD(0x8b0, PIN_OUTPUT | MUX_MODE0) /* lcd_data4.lcd_data4 */ AM33XX_IOPAD(0x8b4, PIN_OUTPUT | MUX_MODE0) /* lcd_data5.lcd_data5 */ AM33XX_IOPAD(0x8b8, PIN_OUTPUT | MUX_MODE0) /* lcd_data6.lcd_data6 */ AM33XX_IOPAD(0x8bc, PIN_OUTPUT | MUX_MODE0) /* lcd_data7.lcd_data7 */ AM33XX_IOPAD(0x8c0, PIN_OUTPUT | MUX_MODE0) /* lcd_data8.lcd_data8 */ AM33XX_IOPAD(0x8c4, PIN_OUTPUT | MUX_MODE0) /* lcd_data9.lcd_data9 */ AM33XX_IOPAD(0x8c8, PIN_OUTPUT | MUX_MODE0) /* lcd_data10.lcd_data10 */ AM33XX_IOPAD(0x8cc, PIN_OUTPUT | MUX_MODE0) /* lcd_data11.lcd_data11 */ AM33XX_IOPAD(0x8d0, PIN_OUTPUT | MUX_MODE0) /* lcd_data12.lcd_data12 */ AM33XX_IOPAD(0x8d4, PIN_OUTPUT | MUX_MODE0) /* lcd_data13.lcd_data13 */ AM33XX_IOPAD(0x8d8, PIN_OUTPUT | MUX_MODE0) /* lcd_data14.lcd_data14 */ AM33XX_IOPAD(0x8dc, PIN_OUTPUT | MUX_MODE0) /* lcd_data15.lcd_data15 */ AM33XX_IOPAD(0x8e0, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* lcd_vsync.lcd_vsync */ AM33XX_IOPAD(0x8e4, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* lcd_hsync.lcd_hsync */ AM33XX_IOPAD(0x8e8, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* lcd_pclk.lcd_pclk */ AM33XX_IOPAD(0x8ec, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* lcd_ac_bias_en.lcd_ac_bias_en */ >; }; nxp_hdmi_bonelt_off_pins: nxp_hdmi_bonelt_off_pins { pinctrl-single,pins = < AM33XX_IOPAD(0x9b0, PIN_OUTPUT_PULLDOWN | MUX_MODE3) /* xdma_event_intr0 */ >; }; mcasp0_pins: mcasp0_pins { pinctrl-single,pins = < AM33XX_IOPAD(0x9ac, PIN_INPUT_PULLUP | MUX_MODE0) /* mcasp0_ahcklx.mcasp0_ahclkx */ AM33XX_IOPAD(0x99c, PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* mcasp0_ahclkr.mcasp0_axr2*/ AM33XX_IOPAD(0x994, PIN_OUTPUT_PULLUP | MUX_MODE0) /* mcasp0_fsx.mcasp0_fsx */ AM33XX_IOPAD(0x990, PIN_OUTPUT_PULLDOWN | MUX_MODE0) /* mcasp0_aclkx.mcasp0_aclkx */ AM33XX_IOPAD(0x86c, PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* gpmc_a11.GPIO1_27 */ >; }; tas_pins: tas_pins { pinctrl-single,pins = < AM33XX_IOPAD(0x84c, PIN_OUTPUT_PULLDOWN | MUX_MODE7) /* tas2505 reset pin gpio1.19 */ >; }; }; &lcdc { status = "okay"; /* para 24 bits cambiar por crossed*/ blue-and-red-wiring = "straight"; port { lcdc_0: endpoint@0 { remote-endpoint = <&hdmi_0>; }; }; }; &i2c0 { tda19988: tda19988 { compatible = "nxp,tda998x"; reg = <0x70>; pinctrl-names = "default", "off"; pinctrl-0 = <&nxp_hdmi_bonelt_pins>; pinctrl-1 = <&nxp_hdmi_bonelt_off_pins>; /* para 24 bits descomentar siguiente linea*/ /* video-ports = <0x234501>; */ #sound-dai-cells = <0>; audio-ports = < TDA998x_I2S 0x03>; ports { port@0 { hdmi_0: endpoint@0 { remote-endpoint = <&lcdc_0>; }; }; }; }; }; &i2c2 { tas2505: tas2505@18 { #sound-dai-cells = <0>; compatible = "ti,tas2505"; reg = <0x18>; gpio-reset = <&gpio1 19 GPIO_ACTIVE_LOW>; status = "ok"; }; }; &rtc { system-power-controller; }; &mcasp0 { #sound-dai-cells = <0>; pinctrl-names = "default"; pinctrl-0 = <&mcasp0_pins>; status = "okay"; op-mode = <0>; /* MCASP_IIS_MODE */ tdm-slots = <8>; serial-dir = < /* 0: INACTIVE, 1: TX, 2: RX */ 2 2 1 0 >; tx-num-evt = <32>; rx-num-evt = <32>; }; / { memory@80000000 { device_type = "memory"; reg = <0x80000000 0x20000000>; /* 512 MB */ }; clk_mcasp0_fixed: clk_mcasp0_fixed { #clock-cells = <0>; compatible = "fixed-clock"; clock-frequency = <24576000>; }; clk_mcasp0: clk_mcasp0 { #clock-cells = <0>; compatible = "gpio-gate-clock"; clocks = <&clk_mcasp0_fixed>; enable-gpios = <&gpio1 27 0>; /* BeagleBone Black Clk enable on GPIO1_27 */ }; sound { compatible = "simple-audio-card"; simple-audio-card,name = "TAS2505"; simple-audio-card,dai-link@0 { format = "i2s"; bitclock-master = <&sound0_master>; frame-master = <&sound0_master>; sound0_master: cpu { sound-dai = <&mcasp0>; clocks = <&clk_mcasp0>; }; codec { sound-dai = <&tas2505>; }; }; }; };
>已成功编译、刷写并在 BBB 上引导映像。
已加载驱动程序(使用 aplay -l 进行检查)、但扬声器测试抛出以下错误：
速率48000Hz 不可用于回放：参数无效
hwparams 设置失败：参数无效
aplay 显示此错误：
Main：828：Audio open error：device or resource busy (主：828：音频打开错误：设备或资源繁忙
>可能是驱动程序/寄存器配置有误
dsmeg 显示了以下内容：
tas2505-codec 2-0018：不支持采样率(32000)和格式
tas2505-codec 2-0018：asoc：无法设置 tas2505-codec.2-0018 HW 参数：-22
在内核中除以0。
>i2cdetect -r 2在寄存器0x18上显示 UU
>在硬件侧、我已连接 I2C2 (SCA 和 SCL)、RESET、I2S (DIN、WCLK、BCLK)线路。
>我没有使用 MCLK 或 SCLK 线路。
>指示 ALSA 命令时、示波器不会在上述行中显示任何内容、I2C 除外
我 使用 Linux 进入嵌入式软件的时间很短、所以我对此不了解太多、而且我的想法已经过时了。
请帮助我继续进行此操作吗？
非常感谢你能抽出时间
