ASoC: cros_ec_codec: Add codec driver for Cros EC
Add a codec driver to control ChromeOS EC codec. Use EC Host command to enable/disable I2S recording and control other configurations. Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org> Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Cheng-Yi Chiang
Mark Brown
Родитель
494a3503d6
Коммит
b291f42a37
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@ -3693,6 +3693,7 @@ S: Maintained
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R: Enric Balletbo i Serra <enric.balletbo@collabora.com>
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R: Guenter Roeck <groeck@chromium.org>
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F: Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
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F: sound/soc/codecs/cros_ec_codec.*
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CIRRUS LOGIC AUDIO CODEC DRIVERS
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M: Brian Austin <brian.austin@cirrus.com>
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@ -50,6 +50,7 @@ config SND_SOC_ALL_CODECS
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select SND_SOC_BT_SCO
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select SND_SOC_BD28623
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select SND_SOC_CQ0093VC
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select SND_SOC_CROS_EC_CODEC if MFD_CROS_EC
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select SND_SOC_CS35L32 if I2C
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select SND_SOC_CS35L33 if I2C
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select SND_SOC_CS35L34 if I2C
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@ -459,6 +460,13 @@ config SND_SOC_CPCAP
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config SND_SOC_CQ0093VC
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tristate
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config SND_SOC_CROS_EC_CODEC
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tristate "codec driver for ChromeOS EC"
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depends on MFD_CROS_EC
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help
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If you say yes here you will get support for the
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ChromeOS Embedded Controller's Audio Codec.
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config SND_SOC_CS35L32
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tristate "Cirrus Logic CS35L32 CODEC"
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depends on I2C
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@ -42,6 +42,7 @@ snd-soc-bd28623-objs := bd28623.o
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snd-soc-bt-sco-objs := bt-sco.o
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snd-soc-cpcap-objs := cpcap.o
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snd-soc-cq93vc-objs := cq93vc.o
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snd-soc-cros-ec-codec-objs := cros_ec_codec.o
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snd-soc-cs35l32-objs := cs35l32.o
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snd-soc-cs35l33-objs := cs35l33.o
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snd-soc-cs35l34-objs := cs35l34.o
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@ -312,6 +313,7 @@ obj-$(CONFIG_SND_SOC_BD28623) += snd-soc-bd28623.o
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obj-$(CONFIG_SND_SOC_BT_SCO) += snd-soc-bt-sco.o
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obj-$(CONFIG_SND_SOC_CQ0093VC) += snd-soc-cq93vc.o
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obj-$(CONFIG_SND_SOC_CPCAP) += snd-soc-cpcap.o
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obj-$(CONFIG_SND_SOC_CROS_EC_CODEC) += snd-soc-cros-ec-codec.o
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obj-$(CONFIG_SND_SOC_CS35L32) += snd-soc-cs35l32.o
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obj-$(CONFIG_SND_SOC_CS35L33) += snd-soc-cs35l33.o
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obj-$(CONFIG_SND_SOC_CS35L34) += snd-soc-cs35l34.o
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@ -0,0 +1,441 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for ChromeOS Embedded Controller codec.
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*
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* This driver uses the cros-ec interface to communicate with the ChromeOS
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* EC for audio function.
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/mfd/cros_ec.h>
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#include <linux/mfd/cros_ec_commands.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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#define DRV_NAME "cros-ec-codec"
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/**
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* struct cros_ec_codec_data - ChromeOS EC codec driver data.
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* @dev: Device structure used in sysfs.
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* @ec_device: cros_ec_device structure to talk to the physical device.
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* @component: Pointer to the component.
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* @max_dmic_gain: Maximum gain in dB supported by EC codec.
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*/
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struct cros_ec_codec_data {
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struct device *dev;
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struct cros_ec_device *ec_device;
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struct snd_soc_component *component;
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unsigned int max_dmic_gain;
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};
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static const DECLARE_TLV_DB_SCALE(ec_mic_gain_tlv, 0, 100, 0);
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static int ec_command_get_gain(struct snd_soc_component *component,
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struct ec_param_codec_i2s *param,
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struct ec_response_codec_gain *resp)
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{
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struct cros_ec_codec_data *codec_data =
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snd_soc_component_get_drvdata(component);
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struct cros_ec_device *ec_device = codec_data->ec_device;
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u8 buffer[sizeof(struct cros_ec_command) +
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max(sizeof(struct ec_param_codec_i2s),
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sizeof(struct ec_response_codec_gain))];
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struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
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int ret;
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msg->version = 0;
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msg->command = EC_CMD_CODEC_I2S;
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msg->outsize = sizeof(struct ec_param_codec_i2s);
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msg->insize = sizeof(struct ec_response_codec_gain);
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memcpy(msg->data, param, msg->outsize);
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ret = cros_ec_cmd_xfer_status(ec_device, msg);
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if (ret > 0)
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memcpy(resp, msg->data, msg->insize);
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return ret;
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}
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/*
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* Wrapper for EC command without response.
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*/
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static int ec_command_no_resp(struct snd_soc_component *component,
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struct ec_param_codec_i2s *param)
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{
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struct cros_ec_codec_data *codec_data =
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snd_soc_component_get_drvdata(component);
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struct cros_ec_device *ec_device = codec_data->ec_device;
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u8 buffer[sizeof(struct cros_ec_command) +
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sizeof(struct ec_param_codec_i2s)];
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struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
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msg->version = 0;
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msg->command = EC_CMD_CODEC_I2S;
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msg->outsize = sizeof(struct ec_param_codec_i2s);
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msg->insize = 0;
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memcpy(msg->data, param, msg->outsize);
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return cros_ec_cmd_xfer_status(ec_device, msg);
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}
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static int set_i2s_config(struct snd_soc_component *component,
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enum ec_i2s_config i2s_config)
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{
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struct ec_param_codec_i2s param;
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dev_dbg(component->dev, "%s set I2S format to %u\n", __func__,
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i2s_config);
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param.cmd = EC_CODEC_I2S_SET_CONFIG;
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param.i2s_config = i2s_config;
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return ec_command_no_resp(component, ¶m);
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}
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static int cros_ec_i2s_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
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{
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struct snd_soc_component *component = dai->component;
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enum ec_i2s_config i2s_config;
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBS_CFS:
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_NB_NF:
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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i2s_config = EC_DAI_FMT_I2S;
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break;
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case SND_SOC_DAIFMT_RIGHT_J:
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i2s_config = EC_DAI_FMT_RIGHT_J;
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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i2s_config = EC_DAI_FMT_LEFT_J;
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break;
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case SND_SOC_DAIFMT_DSP_A:
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i2s_config = EC_DAI_FMT_PCM_A;
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break;
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case SND_SOC_DAIFMT_DSP_B:
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i2s_config = EC_DAI_FMT_PCM_B;
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break;
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default:
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return -EINVAL;
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}
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return set_i2s_config(component, i2s_config);
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}
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static int set_i2s_sample_depth(struct snd_soc_component *component,
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enum ec_sample_depth_value depth)
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{
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struct ec_param_codec_i2s param;
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dev_dbg(component->dev, "%s set depth to %u\n", __func__, depth);
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param.cmd = EC_CODEC_SET_SAMPLE_DEPTH;
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param.depth = depth;
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return ec_command_no_resp(component, ¶m);
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}
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static int set_i2s_bclk(struct snd_soc_component *component, uint32_t bclk)
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{
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struct ec_param_codec_i2s param;
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dev_dbg(component->dev, "%s set i2s bclk to %u\n", __func__, bclk);
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param.cmd = EC_CODEC_I2S_SET_BCLK;
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param.bclk = bclk;
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return ec_command_no_resp(component, ¶m);
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}
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static int cros_ec_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_component *component = dai->component;
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unsigned int rate, bclk;
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int ret;
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rate = params_rate(params);
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if (rate != 48000)
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return -EINVAL;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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ret = set_i2s_sample_depth(component, EC_CODEC_SAMPLE_DEPTH_16);
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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ret = set_i2s_sample_depth(component, EC_CODEC_SAMPLE_DEPTH_24);
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break;
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default:
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return -EINVAL;
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}
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if (ret < 0)
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return ret;
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bclk = snd_soc_params_to_bclk(params);
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return set_i2s_bclk(component, bclk);
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}
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static const struct snd_soc_dai_ops cros_ec_i2s_dai_ops = {
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.hw_params = cros_ec_i2s_hw_params,
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.set_fmt = cros_ec_i2s_set_dai_fmt,
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};
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struct snd_soc_dai_driver cros_ec_dai[] = {
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{
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.name = "cros_ec_codec I2S",
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.id = 0,
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.capture = {
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.stream_name = "I2S Capture",
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.channels_min = 2,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_48000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_LE,
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},
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.ops = &cros_ec_i2s_dai_ops,
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}
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};
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static int get_ec_mic_gain(struct snd_soc_component *component,
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u8 *left, u8 *right)
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{
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struct ec_param_codec_i2s param;
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struct ec_response_codec_gain resp;
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int ret;
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param.cmd = EC_CODEC_GET_GAIN;
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ret = ec_command_get_gain(component, ¶m, &resp);
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if (ret < 0)
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return ret;
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*left = resp.left;
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*right = resp.right;
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return 0;
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}
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static int mic_gain_get(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_component *component =
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snd_soc_kcontrol_component(kcontrol);
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u8 left, right;
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int ret;
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ret = get_ec_mic_gain(component, &left, &right);
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if (ret)
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return ret;
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ucontrol->value.integer.value[0] = left;
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ucontrol->value.integer.value[1] = right;
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return 0;
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}
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static int set_ec_mic_gain(struct snd_soc_component *component,
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u8 left, u8 right)
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{
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struct ec_param_codec_i2s param;
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dev_dbg(component->dev, "%s set mic gain to %u, %u\n",
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__func__, left, right);
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param.cmd = EC_CODEC_SET_GAIN;
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param.gain.left = left;
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param.gain.right = right;
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return ec_command_no_resp(component, ¶m);
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}
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static int mic_gain_put(struct snd_kcontrol *kcontrol,
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struct snd_ctl_elem_value *ucontrol)
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{
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struct snd_soc_component *component =
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snd_soc_kcontrol_component(kcontrol);
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struct cros_ec_codec_data *codec_data =
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snd_soc_component_get_drvdata(component);
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int left = ucontrol->value.integer.value[0];
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int right = ucontrol->value.integer.value[1];
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unsigned int max_dmic_gain = codec_data->max_dmic_gain;
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if (left > max_dmic_gain || right > max_dmic_gain)
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return -EINVAL;
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return set_ec_mic_gain(component, (u8)left, (u8)right);
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}
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static struct snd_kcontrol_new mic_gain_control =
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SOC_DOUBLE_EXT_TLV("EC Mic Gain", SND_SOC_NOPM, SND_SOC_NOPM, 0, 0, 0,
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mic_gain_get, mic_gain_put, ec_mic_gain_tlv);
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static int enable_i2s(struct snd_soc_component *component, int enable)
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{
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struct ec_param_codec_i2s param;
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dev_dbg(component->dev, "%s set i2s to %u\n", __func__, enable);
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param.cmd = EC_CODEC_I2S_ENABLE;
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param.i2s_enable = enable;
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return ec_command_no_resp(component, ¶m);
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}
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static int cros_ec_i2s_enable_event(struct snd_soc_dapm_widget *w,
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struct snd_kcontrol *kcontrol, int event)
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{
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struct snd_soc_component *component =
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snd_soc_dapm_to_component(w->dapm);
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switch (event) {
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case SND_SOC_DAPM_PRE_PMU:
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dev_dbg(component->dev,
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"%s got SND_SOC_DAPM_PRE_PMU event\n", __func__);
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return enable_i2s(component, 1);
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case SND_SOC_DAPM_PRE_PMD:
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dev_dbg(component->dev,
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"%s got SND_SOC_DAPM_PRE_PMD event\n", __func__);
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return enable_i2s(component, 0);
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}
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return 0;
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}
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/*
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* The goal of this DAPM route is to turn on/off I2S using EC
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* host command when capture stream is started/stopped.
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*/
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static const struct snd_soc_dapm_widget cros_ec_codec_dapm_widgets[] = {
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SND_SOC_DAPM_INPUT("DMIC"),
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/*
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* Control EC to enable/disable I2S.
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*/
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SND_SOC_DAPM_SUPPLY("I2S Enable", SND_SOC_NOPM,
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0, 0, cros_ec_i2s_enable_event,
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SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_PRE_PMD),
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SND_SOC_DAPM_AIF_OUT("I2STX", "I2S Capture", 0, SND_SOC_NOPM, 0, 0),
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};
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static const struct snd_soc_dapm_route cros_ec_codec_dapm_routes[] = {
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{ "I2STX", NULL, "DMIC" },
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{ "I2STX", NULL, "I2S Enable" },
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};
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/*
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* Read maximum gain from device property and set it to mixer control.
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*/
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static int cros_ec_set_gain_range(struct device *dev)
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{
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struct soc_mixer_control *control;
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struct cros_ec_codec_data *codec_data = dev_get_drvdata(dev);
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int rc;
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rc = device_property_read_u32(dev, "max-dmic-gain",
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&codec_data->max_dmic_gain);
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if (rc)
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return rc;
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control = (struct soc_mixer_control *)
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mic_gain_control.private_value;
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control->max = codec_data->max_dmic_gain;
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control->platform_max = codec_data->max_dmic_gain;
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return 0;
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}
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static int cros_ec_codec_probe(struct snd_soc_component *component)
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{
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int rc;
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struct cros_ec_codec_data *codec_data =
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snd_soc_component_get_drvdata(component);
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rc = cros_ec_set_gain_range(codec_data->dev);
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if (rc)
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return rc;
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return snd_soc_add_component_controls(component, &mic_gain_control, 1);
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}
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static const struct snd_soc_component_driver cros_ec_component_driver = {
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.probe = cros_ec_codec_probe,
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.dapm_widgets = cros_ec_codec_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(cros_ec_codec_dapm_widgets),
|
||||
.dapm_routes = cros_ec_codec_dapm_routes,
|
||||
.num_dapm_routes = ARRAY_SIZE(cros_ec_codec_dapm_routes),
|
||||
};
|
||||
|
||||
/*
|
||||
* Platform device and platform driver fro cros-ec-codec.
|
||||
*/
|
||||
static int cros_ec_codec_platform_probe(struct platform_device *pd)
|
||||
{
|
||||
struct device *dev = &pd->dev;
|
||||
struct cros_ec_device *ec_device = dev_get_drvdata(pd->dev.parent);
|
||||
struct cros_ec_codec_data *codec_data;
|
||||
|
||||
codec_data = devm_kzalloc(dev, sizeof(struct cros_ec_codec_data),
|
||||
GFP_KERNEL);
|
||||
if (!codec_data)
|
||||
return -ENOMEM;
|
||||
|
||||
codec_data->dev = dev;
|
||||
codec_data->ec_device = ec_device;
|
||||
|
||||
platform_set_drvdata(pd, codec_data);
|
||||
|
||||
return snd_soc_register_component(dev, &cros_ec_component_driver,
|
||||
cros_ec_dai, ARRAY_SIZE(cros_ec_dai));
|
||||
}
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id cros_ec_codec_of_match[] = {
|
||||
{ .compatible = "google,cros-ec-codec" },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, cros_ec_codec_of_match);
|
||||
#endif
|
||||
|
||||
static struct platform_driver cros_ec_codec_platform_driver = {
|
||||
.driver = {
|
||||
.name = DRV_NAME,
|
||||
.of_match_table = of_match_ptr(cros_ec_codec_of_match),
|
||||
},
|
||||
.probe = cros_ec_codec_platform_probe,
|
||||
};
|
||||
|
||||
module_platform_driver(cros_ec_codec_platform_driver);
|
||||
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("ChromeOS EC codec driver");
|
||||
MODULE_AUTHOR("Cheng-Yi Chiang <cychiang@chromium.org>");
|
||||
MODULE_ALIAS("platform:" DRV_NAME);
|
||||
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