[alsa-devel] [PATCH v3 05/10] ASoC: cros_ec_codec: read max DMIC gain from EC codec
Benson Leung
bleung at google.com
Thu Oct 17 05:07:17 CEST 2019
On Mon, Oct 14, 2019 at 06:20:17PM +0800, Tzung-Bi Shih wrote:
> Read max DMIC gain from EC codec instead of DTS. Also removes the
> dt-binding of max-dmic-gain.
>
> Acked-by: Rob Herring <robh at kernel.org>
> Signed-off-by: Tzung-Bi Shih <tzungbi at google.com>
Acked-By: Benson Leung <bleung at chromium.org>
> ---
> .../bindings/sound/google,cros-ec-codec.txt | 4 +-
> .../linux/platform_data/cros_ec_commands.h | 43 +++++++++++----
> sound/soc/codecs/cros_ec_codec.c | 53 ++++++++++++++-----
> 3 files changed, 73 insertions(+), 27 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt b/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
> index 1084f7f22eea..0ce9fafc78e2 100644
> --- a/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
> +++ b/Documentation/devicetree/bindings/sound/google,cros-ec-codec.txt
> @@ -1,4 +1,4 @@
> -* Audio codec controlled by ChromeOS EC
> +Audio codec controlled by ChromeOS EC
>
> Google's ChromeOS EC codec is a digital mic codec provided by the
> Embedded Controller (EC) and is controlled via a host-command interface.
> @@ -9,7 +9,6 @@ Documentation/devicetree/bindings/mfd/cros-ec.txt).
> Required properties:
> - compatible: Must contain "google,cros-ec-codec"
> - #sound-dai-cells: Should be 1. The cell specifies number of DAIs.
> -- max-dmic-gain: A number for maximum gain in dB on digital microphone.
>
> Example:
>
> @@ -21,6 +20,5 @@ cros-ec at 0 {
> cros_ec_codec: ec-codec {
> compatible = "google,cros-ec-codec";
> #sound-dai-cells = <1>;
> - max-dmic-gain = <43>;
> };
> };
> diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
> index 3ca0fa9e92a7..21db0d4d4025 100644
> --- a/include/linux/platform_data/cros_ec_commands.h
> +++ b/include/linux/platform_data/cros_ec_commands.h
> @@ -4530,30 +4530,53 @@ struct __ec_align4 ec_response_ec_codec_get_shm_addr {
> #define EC_CMD_EC_CODEC_DMIC 0x00BD
>
> enum ec_codec_dmic_subcmd {
> - EC_CODEC_DMIC_SET_GAIN = 0x0,
> - EC_CODEC_DMIC_GET_GAIN = 0x1,
> + EC_CODEC_DMIC_GET_MAX_GAIN = 0x0,
> + EC_CODEC_DMIC_SET_GAIN_IDX = 0x1,
> + EC_CODEC_DMIC_GET_GAIN_IDX = 0x2,
> EC_CODEC_DMIC_SUBCMD_COUNT,
> };
>
> -struct __ec_align1 ec_param_ec_codec_dmic_set_gain {
> - uint8_t left;
> - uint8_t right;
> +enum ec_codec_dmic_channel {
> + EC_CODEC_DMIC_CHANNEL_0 = 0x0,
> + EC_CODEC_DMIC_CHANNEL_1 = 0x1,
> + EC_CODEC_DMIC_CHANNEL_2 = 0x2,
> + EC_CODEC_DMIC_CHANNEL_3 = 0x3,
> + EC_CODEC_DMIC_CHANNEL_4 = 0x4,
> + EC_CODEC_DMIC_CHANNEL_5 = 0x5,
> + EC_CODEC_DMIC_CHANNEL_6 = 0x6,
> + EC_CODEC_DMIC_CHANNEL_7 = 0x7,
> + EC_CODEC_DMIC_CHANNEL_COUNT,
> +};
> +
> +struct __ec_align1 ec_param_ec_codec_dmic_set_gain_idx {
> + uint8_t channel; /* enum ec_codec_dmic_channel */
> + uint8_t gain;
> uint8_t reserved[2];
> };
>
> +struct __ec_align1 ec_param_ec_codec_dmic_get_gain_idx {
> + uint8_t channel; /* enum ec_codec_dmic_channel */
> + uint8_t reserved[3];
> +};
> +
> struct __ec_align4 ec_param_ec_codec_dmic {
> uint8_t cmd; /* enum ec_codec_dmic_subcmd */
> uint8_t reserved[3];
>
> union {
> - struct ec_param_ec_codec_dmic_set_gain
> - set_gain_param;
> + struct ec_param_ec_codec_dmic_set_gain_idx
> + set_gain_idx_param;
> + struct ec_param_ec_codec_dmic_get_gain_idx
> + get_gain_idx_param;
> };
> };
>
> -struct __ec_align1 ec_response_ec_codec_dmic_get_gain {
> - uint8_t left;
> - uint8_t right;
> +struct __ec_align1 ec_response_ec_codec_dmic_get_max_gain {
> + uint8_t max_gain;
> +};
> +
> +struct __ec_align1 ec_response_ec_codec_dmic_get_gain_idx {
> + uint8_t gain;
> };
>
> /*****************************************************************************/
> diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c
> index c19c7fe42e2e..3d4f9e82d6e9 100644
> --- a/sound/soc/codecs/cros_ec_codec.c
> +++ b/sound/soc/codecs/cros_ec_codec.c
> @@ -65,18 +65,26 @@ static int dmic_get_gain(struct snd_kcontrol *kcontrol,
> struct cros_ec_codec_priv *priv =
> snd_soc_component_get_drvdata(component);
> struct ec_param_ec_codec_dmic p;
> - struct ec_response_ec_codec_dmic_get_gain r;
> + struct ec_response_ec_codec_dmic_get_gain_idx r;
> int ret;
>
> - p.cmd = EC_CODEC_DMIC_GET_GAIN;
> + p.cmd = EC_CODEC_DMIC_GET_GAIN_IDX;
> + p.get_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_0;
> ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
> (uint8_t *)&p, sizeof(p),
> (uint8_t *)&r, sizeof(r));
> if (ret < 0)
> return ret;
> + ucontrol->value.integer.value[0] = r.gain;
>
> - ucontrol->value.integer.value[0] = r.left;
> - ucontrol->value.integer.value[1] = r.right;
> + p.cmd = EC_CODEC_DMIC_GET_GAIN_IDX;
> + p.get_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_1;
> + ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
> + (uint8_t *)&p, sizeof(p),
> + (uint8_t *)&r, sizeof(r));
> + if (ret < 0)
> + return ret;
> + ucontrol->value.integer.value[1] = r.gain;
>
> return 0;
> }
> @@ -94,15 +102,24 @@ static int dmic_put_gain(struct snd_kcontrol *kcontrol,
> int left = ucontrol->value.integer.value[0];
> int right = ucontrol->value.integer.value[1];
> struct ec_param_ec_codec_dmic p;
> + int ret;
>
> if (left > max_dmic_gain || right > max_dmic_gain)
> return -EINVAL;
>
> dev_dbg(component->dev, "set mic gain to %u, %u\n", left, right);
>
> - p.cmd = EC_CODEC_DMIC_SET_GAIN;
> - p.set_gain_param.left = left;
> - p.set_gain_param.right = right;
> + p.cmd = EC_CODEC_DMIC_SET_GAIN_IDX;
> + p.set_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_0;
> + p.set_gain_idx_param.gain = left;
> + ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
> + (uint8_t *)&p, sizeof(p), NULL, 0);
> + if (ret < 0)
> + return ret;
> +
> + p.cmd = EC_CODEC_DMIC_SET_GAIN_IDX;
> + p.set_gain_idx_param.channel = EC_CODEC_DMIC_CHANNEL_1;
> + p.set_gain_idx_param.gain = right;
> return send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
> (uint8_t *)&p, sizeof(p), NULL, 0);
> }
> @@ -125,19 +142,27 @@ static int dmic_probe(struct snd_soc_component *component)
> struct cros_ec_codec_priv *priv =
> snd_soc_component_get_drvdata(component);
> struct device *dev = priv->dev;
> - int ret, val;
> struct soc_mixer_control *control;
> + struct ec_param_ec_codec_dmic p;
> + struct ec_response_ec_codec_dmic_get_max_gain r;
> + int ret;
>
> - ret = device_property_read_u32(dev, "max-dmic-gain", &val);
> - if (ret) {
> - dev_err(dev, "Failed to read 'max-dmic-gain'\n");
> - return ret;
> + p.cmd = EC_CODEC_DMIC_GET_MAX_GAIN;
> +
> + ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
> + (uint8_t *)&p, sizeof(p),
> + (uint8_t *)&r, sizeof(r));
> + if (ret < 0) {
> + dev_warn(dev, "get_max_gain() unsupported\n");
> + return 0;
> }
>
> + dev_dbg(dev, "max gain = %d\n", r.max_gain);
> +
> control = (struct soc_mixer_control *)
> dmic_controls[DMIC_CTL_GAIN].private_value;
> - control->max = val;
> - control->platform_max = val;
> + control->max = r.max_gain;
> + control->platform_max = r.max_gain;
>
> return snd_soc_add_component_controls(component,
> &dmic_controls[DMIC_CTL_GAIN], 1);
> --
> 2.23.0.700.g56cf767bdb-goog
>
--
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung at google.com
Chromium OS Project
bleung at chromium.org
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