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Subject[PATCH v4 2/2] ASoC: cros_ec_codec: Add codec driver for Cros EC
Date
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>
---
Changes in v4:

- Fix Kconfig that SND_SOC_CROS_EC_CODEC should depend on MFD_CROS_EC.
- Remove usage of MAX_GAIN.
- Add max-dmic-gain device property.
- Read max-dmic-gain property and add mixer control in component probe.
- Rename cros_ec_dapm_widgets to cros_ec_codec_dapm_widgets for consistency.
- Fix missing return code in cros_ec_codec_platform_probe.
- Rename set_bclk to set_i2s_bclk.
- Add ec_command_get_gain for EC subcommand EC_CODEC_GET_GAIN, which
is the only subcommand that needs response.
- Add ec_command_no_resp as a simplified version of ec_command for EC commands
that do not need response.
- Simplify all static functions that uses ec_command_no_resp. Return return code
directly without logging.
- Remove useless frame_size in cros_ec_i2s_hw_params.
- Remove error messages in cros_ec_i2s_hw_params for consistency.
- Remove error messages in get_ec_mic_gain.


MAINTAINERS | 1 +
sound/soc/codecs/Kconfig | 8 +
sound/soc/codecs/Makefile | 2 +
sound/soc/codecs/cros_ec_codec.c | 441 +++++++++++++++++++++++++++++++
4 files changed, 452 insertions(+)
create mode 100644 sound/soc/codecs/cros_ec_codec.c

diff --git a/MAINTAINERS b/MAINTAINERS
index a5678e4041e9..e5696ab5d10a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3694,6 +3694,7 @@ S: Maintained
R: Enric Balletbo i Serra <enric.balletbo@collabora.com>
R: Guenter Roeck <groeck@chromium.org>
F: Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
+F: sound/soc/codecs/cros_ec_codec.*

CIRRUS LOGIC AUDIO CODEC DRIVERS
M: Brian Austin <brian.austin@cirrus.com>
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index 71e6e123a115..d1ef359b47bd 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -50,6 +50,7 @@ config SND_SOC_ALL_CODECS
select SND_SOC_BT_SCO
select SND_SOC_BD28623
select SND_SOC_CQ0093VC
+ select SND_SOC_CROS_EC_CODEC if MFD_CROS_EC
select SND_SOC_CS35L32 if I2C
select SND_SOC_CS35L33 if I2C
select SND_SOC_CS35L34 if I2C
@@ -457,6 +458,13 @@ config SND_SOC_CPCAP
config SND_SOC_CQ0093VC
tristate

+config SND_SOC_CROS_EC_CODEC
+ tristate "codec driver for ChromeOS EC"
+ depends on MFD_CROS_EC
+ help
+ If you say yes here you will get support for the
+ ChromeOS Embedded Controller's Audio Codec.
+
config SND_SOC_CS35L32
tristate "Cirrus Logic CS35L32 CODEC"
depends on I2C
diff --git a/sound/soc/codecs/Makefile b/sound/soc/codecs/Makefile
index 9bb3346fab2f..3cfd8f5f6170 100644
--- a/sound/soc/codecs/Makefile
+++ b/sound/soc/codecs/Makefile
@@ -42,6 +42,7 @@ snd-soc-bd28623-objs := bd28623.o
snd-soc-bt-sco-objs := bt-sco.o
snd-soc-cpcap-objs := cpcap.o
snd-soc-cq93vc-objs := cq93vc.o
+snd-soc-cros-ec-codec-objs := cros_ec_codec.o
snd-soc-cs35l32-objs := cs35l32.o
snd-soc-cs35l33-objs := cs35l33.o
snd-soc-cs35l34-objs := cs35l34.o
@@ -310,6 +311,7 @@ obj-$(CONFIG_SND_SOC_BD28623) += snd-soc-bd28623.o
obj-$(CONFIG_SND_SOC_BT_SCO) += snd-soc-bt-sco.o
obj-$(CONFIG_SND_SOC_CQ0093VC) += snd-soc-cq93vc.o
obj-$(CONFIG_SND_SOC_CPCAP) += snd-soc-cpcap.o
+obj-$(CONFIG_SND_SOC_CROS_EC_CODEC) += snd-soc-cros-ec-codec.o
obj-$(CONFIG_SND_SOC_CS35L32) += snd-soc-cs35l32.o
obj-$(CONFIG_SND_SOC_CS35L33) += snd-soc-cs35l33.o
obj-$(CONFIG_SND_SOC_CS35L34) += snd-soc-cs35l34.o
diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c
new file mode 100644
index 000000000000..b14100b6a939
--- /dev/null
+++ b/sound/soc/codecs/cros_ec_codec.c
@@ -0,0 +1,441 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for ChromeOS Embedded Controller codec.
+ *
+ * This driver uses the cros-ec interface to communicate with the ChromeOS
+ * EC for audio function.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/tlv.h>
+
+#define DRV_NAME "cros-ec-codec"
+
+/**
+ * struct cros_ec_codec_data - ChromeOS EC codec driver data.
+ * @dev: Device structure used in sysfs.
+ * @ec_device: cros_ec_device structure to talk to the physical device.
+ * @component: Pointer to the component.
+ * @max_dmic_gain: Maximum gain in dB supported by EC codec.
+ */
+struct cros_ec_codec_data {
+ struct device *dev;
+ struct cros_ec_device *ec_device;
+ struct snd_soc_component *component;
+ unsigned int max_dmic_gain;
+};
+
+static const DECLARE_TLV_DB_SCALE(ec_mic_gain_tlv, 0, 100, 0);
+
+static int ec_command_get_gain(struct snd_soc_component *component,
+ struct ec_param_codec_i2s *param,
+ struct ec_response_codec_gain *resp)
+{
+ struct cros_ec_codec_data *codec_data =
+ snd_soc_component_get_drvdata(component);
+ struct cros_ec_device *ec_device = codec_data->ec_device;
+ u8 buffer[sizeof(struct cros_ec_command) +
+ max(sizeof(struct ec_param_codec_i2s),
+ sizeof(struct ec_response_codec_gain))];
+ struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
+ int ret;
+
+ msg->version = 0;
+ msg->command = EC_CMD_CODEC_I2S;
+ msg->outsize = sizeof(struct ec_param_codec_i2s);
+ msg->insize = sizeof(struct ec_response_codec_gain);
+
+ memcpy(msg->data, param, msg->outsize);
+
+ ret = cros_ec_cmd_xfer_status(ec_device, msg);
+ if (ret > 0)
+ memcpy(resp, msg->data, msg->insize);
+
+ return ret;
+}
+
+/*
+ * Wrapper for EC command without response.
+ */
+static int ec_command_no_resp(struct snd_soc_component *component,
+ struct ec_param_codec_i2s *param)
+{
+ struct cros_ec_codec_data *codec_data =
+ snd_soc_component_get_drvdata(component);
+ struct cros_ec_device *ec_device = codec_data->ec_device;
+ u8 buffer[sizeof(struct cros_ec_command) +
+ sizeof(struct ec_param_codec_i2s)];
+ struct cros_ec_command *msg = (struct cros_ec_command *)&buffer;
+
+ msg->version = 0;
+ msg->command = EC_CMD_CODEC_I2S;
+ msg->outsize = sizeof(struct ec_param_codec_i2s);
+ msg->insize = 0;
+
+ memcpy(msg->data, param, msg->outsize);
+
+ return cros_ec_cmd_xfer_status(ec_device, msg);
+}
+
+static int set_i2s_config(struct snd_soc_component *component,
+ enum ec_i2s_config i2s_config)
+{
+ struct ec_param_codec_i2s param;
+
+ dev_dbg(component->dev, "%s set I2S format to %u\n", __func__,
+ i2s_config);
+
+ param.cmd = EC_CODEC_I2S_SET_CONFIG;
+ param.i2s_config = i2s_config;
+
+ return ec_command_no_resp(component, &param);
+}
+
+static int cros_ec_i2s_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct snd_soc_component *component = dai->component;
+ enum ec_i2s_config i2s_config;
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ i2s_config = EC_DAI_FMT_I2S;
+ break;
+
+ case SND_SOC_DAIFMT_RIGHT_J:
+ i2s_config = EC_DAI_FMT_RIGHT_J;
+ break;
+
+ case SND_SOC_DAIFMT_LEFT_J:
+ i2s_config = EC_DAI_FMT_LEFT_J;
+ break;
+
+ case SND_SOC_DAIFMT_DSP_A:
+ i2s_config = EC_DAI_FMT_PCM_A;
+ break;
+
+ case SND_SOC_DAIFMT_DSP_B:
+ i2s_config = EC_DAI_FMT_PCM_B;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return set_i2s_config(component, i2s_config);
+}
+
+static int set_i2s_sample_depth(struct snd_soc_component *component,
+ enum ec_sample_depth_value depth)
+{
+ struct ec_param_codec_i2s param;
+
+ dev_dbg(component->dev, "%s set depth to %u\n", __func__, depth);
+
+ param.cmd = EC_CODEC_SET_SAMPLE_DEPTH;
+ param.depth = depth;
+
+ return ec_command_no_resp(component, &param);
+}
+
+static int set_i2s_bclk(struct snd_soc_component *component, uint32_t bclk)
+{
+ struct ec_param_codec_i2s param;
+
+ dev_dbg(component->dev, "%s set i2s bclk to %u\n", __func__, bclk);
+
+ param.cmd = EC_CODEC_I2S_SET_BCLK;
+ param.bclk = bclk;
+
+ return ec_command_no_resp(component, &param);
+}
+
+static int cros_ec_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+ unsigned int rate, bclk;
+ int ret;
+
+ rate = params_rate(params);
+ if (rate != 48000)
+ return -EINVAL;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ ret = set_i2s_sample_depth(component, EC_CODEC_SAMPLE_DEPTH_16);
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ ret = set_i2s_sample_depth(component, EC_CODEC_SAMPLE_DEPTH_24);
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (ret < 0)
+ return ret;
+
+ bclk = snd_soc_params_to_bclk(params);
+ return set_i2s_bclk(component, bclk);
+}
+
+static const struct snd_soc_dai_ops cros_ec_i2s_dai_ops = {
+ .hw_params = cros_ec_i2s_hw_params,
+ .set_fmt = cros_ec_i2s_set_dai_fmt,
+};
+
+struct snd_soc_dai_driver cros_ec_dai[] = {
+ {
+ .name = "cros_ec_codec I2S",
+ .id = 0,
+ .capture = {
+ .stream_name = "I2S Capture",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S24_LE,
+ },
+ .ops = &cros_ec_i2s_dai_ops,
+ }
+};
+
+static int get_ec_mic_gain(struct snd_soc_component *component,
+ u8 *left, u8 *right)
+{
+ struct ec_param_codec_i2s param;
+ struct ec_response_codec_gain resp;
+ int ret;
+
+ param.cmd = EC_CODEC_GET_GAIN;
+
+ ret = ec_command_get_gain(component, &param, &resp);
+ if (ret < 0)
+ return ret;
+
+ *left = resp.left;
+ *right = resp.right;
+
+ return 0;
+}
+
+static int mic_gain_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *component =
+ snd_soc_kcontrol_component(kcontrol);
+ u8 left, right;
+ int ret;
+
+ ret = get_ec_mic_gain(component, &left, &right);
+ if (ret)
+ return ret;
+
+ ucontrol->value.integer.value[0] = left;
+ ucontrol->value.integer.value[1] = right;
+
+ return 0;
+}
+
+static int set_ec_mic_gain(struct snd_soc_component *component,
+ u8 left, u8 right)
+{
+ struct ec_param_codec_i2s param;
+
+ dev_dbg(component->dev, "%s set mic gain to %u, %u\n",
+ __func__, left, right);
+
+ param.cmd = EC_CODEC_SET_GAIN;
+ param.gain.left = left;
+ param.gain.right = right;
+
+ return ec_command_no_resp(component, &param);
+}
+
+static int mic_gain_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *component =
+ snd_soc_kcontrol_component(kcontrol);
+ struct cros_ec_codec_data *codec_data =
+ snd_soc_component_get_drvdata(component);
+ int left = ucontrol->value.integer.value[0];
+ int right = ucontrol->value.integer.value[1];
+ unsigned int max_dmic_gain = codec_data->max_dmic_gain;
+
+ if (left > max_dmic_gain || right > max_dmic_gain)
+ return -EINVAL;
+
+ return set_ec_mic_gain(component, (u8)left, (u8)right);
+}
+
+static struct snd_kcontrol_new mic_gain_control =
+ SOC_DOUBLE_EXT_TLV("EC Mic Gain", SND_SOC_NOPM, SND_SOC_NOPM, 0, 0, 0,
+ mic_gain_get, mic_gain_put, ec_mic_gain_tlv);
+
+static int enable_i2s(struct snd_soc_component *component, int enable)
+{
+ struct ec_param_codec_i2s param;
+
+ dev_dbg(component->dev, "%s set i2s to %u\n", __func__, enable);
+
+ param.cmd = EC_CODEC_I2S_ENABLE;
+ param.i2s_enable = enable;
+
+ return ec_command_no_resp(component, &param);
+}
+
+static int cros_ec_i2s_enable_event(struct snd_soc_dapm_widget *w,
+ struct snd_kcontrol *kcontrol, int event)
+{
+ struct snd_soc_component *component =
+ snd_soc_dapm_to_component(w->dapm);
+
+ switch (event) {
+ case SND_SOC_DAPM_PRE_PMU:
+ dev_dbg(component->dev,
+ "%s got SND_SOC_DAPM_PRE_PMU event\n", __func__);
+ return enable_i2s(component, 1);
+
+ case SND_SOC_DAPM_PRE_PMD:
+ dev_dbg(component->dev,
+ "%s got SND_SOC_DAPM_PRE_PMD event\n", __func__);
+ return enable_i2s(component, 0);
+ }
+
+ return 0;
+}
+
+/*
+ * The goal of this DAPM route is to turn on/off I2S using EC
+ * host command when capture stream is started/stopped.
+ */
+static const struct snd_soc_dapm_widget cros_ec_codec_dapm_widgets[] = {
+ SND_SOC_DAPM_INPUT("DMIC"),
+
+ /*
+ * Control EC to enable/disable I2S.
+ */
+ SND_SOC_DAPM_SUPPLY("I2S Enable", SND_SOC_NOPM,
+ 0, 0, cros_ec_i2s_enable_event,
+ SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_PRE_PMD),
+
+ SND_SOC_DAPM_AIF_OUT("I2STX", "I2S Capture", 0, SND_SOC_NOPM, 0, 0),
+};
+
+static const struct snd_soc_dapm_route cros_ec_codec_dapm_routes[] = {
+ { "I2STX", NULL, "DMIC" },
+ { "I2STX", NULL, "I2S Enable" },
+};
+
+/*
+ * Read maximum gain from device property and set it to mixer control.
+ */
+static int cros_ec_set_gain_range(struct device *dev)
+{
+ struct soc_mixer_control *control;
+ struct cros_ec_codec_data *codec_data = dev_get_drvdata(dev);
+ int rc;
+
+ rc = device_property_read_u32(dev, "max-dmic-gain",
+ &codec_data->max_dmic_gain);
+ if (rc)
+ return rc;
+
+ control = (struct soc_mixer_control *)
+ mic_gain_control.private_value;
+ control->max = codec_data->max_dmic_gain;
+ control->platform_max = codec_data->max_dmic_gain;
+
+ return 0;
+}
+
+static int cros_ec_codec_probe(struct snd_soc_component *component)
+{
+ int rc;
+
+ struct cros_ec_codec_data *codec_data =
+ snd_soc_component_get_drvdata(component);
+
+ rc = cros_ec_set_gain_range(codec_data->dev);
+ if (rc)
+ return rc;
+
+ return snd_soc_add_component_controls(component, &mic_gain_control, 1);
+}
+
+static const struct snd_soc_component_driver cros_ec_component_driver = {
+ .probe = cros_ec_codec_probe,
+ .dapm_widgets = cros_ec_codec_dapm_widgets,
+ .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);
--
2.20.1.321.g9e740568ce-goog
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