audio_codec: add DMIC abstract layer

Common DMIC host commands:
- get_max_gain
- get_gain_idx
- set_gain_idx

BRANCH=none
BUG=b:122027734, b:123268236
TEST=1. define CONFIG_AUDIO_CODEC in board.h
2. define CONFIG_AUDIO_CODEC_DMIC in board.h
3. make BOARD=kukui_scp -j

Change-Id: I7b4cc11645675f9d790947b17c3ea385dae13483
Signed-off-by: Tzung-Bi Shih <tzungbi@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1564502
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

2 files changed, 78 insertions, 0 deletions

diff --git a/common/audio_codec_dmic.c b/common/audio_codec_dmic.c
new file mode 100644
index 0000000000..461b8508e9
--- /dev/null
+++ b/common/audio_codec_dmic.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2019 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "audio_codec.h"
+#include "console.h"
+#include "host_command.h"
+
+#define CPRINTS(format, args...) cprints(CC_AUDIO_CODEC, format, ## args)
+
+static int dmic_get_max_gain(struct host_cmd_handler_args *args)
+{
+	struct ec_response_ec_codec_dmic_get_max_gain *r = args->response;
+
+	if (audio_codec_dmic_get_max_gain(&r->max_gain) != EC_SUCCESS)
+		return EC_RES_ERROR;
+
+	args->response_size = sizeof(*r);
+	return EC_RES_SUCCESS;
+}
+
+static int dmic_set_gain_idx(struct host_cmd_handler_args *args)
+{
+	const struct ec_param_ec_codec_dmic *p = args->params;
+
+	if (audio_codec_dmic_set_gain_idx(
+			p->set_gain_idx_param.channel,
+			p->set_gain_idx_param.gain) != EC_SUCCESS)
+		return EC_RES_ERROR;
+
+	return EC_RES_SUCCESS;
+}
+
+static int dmic_get_gain_idx(struct host_cmd_handler_args *args)
+{
+	const struct ec_param_ec_codec_dmic *p = args->params;
+	struct ec_response_ec_codec_dmic_get_gain_idx *r = args->response;
+
+	if (audio_codec_dmic_get_gain_idx(
+			p->get_gain_idx_param.channel, &r->gain) != EC_SUCCESS)
+		return EC_RES_ERROR;
+
+	args->response_size = sizeof(*r);
+	return EC_RES_SUCCESS;
+}
+
+static int (*sub_cmds[])(struct host_cmd_handler_args *) = {
+	[EC_CODEC_DMIC_GET_MAX_GAIN] = dmic_get_max_gain,
+	[EC_CODEC_DMIC_SET_GAIN_IDX] = dmic_set_gain_idx,
+	[EC_CODEC_DMIC_GET_GAIN_IDX] = dmic_get_gain_idx,
+};
+
+#ifdef DEBUG_AUDIO_CODEC
+static char *strcmd[] = {
+	[EC_CODEC_DMIC_GET_MAX_GAIN] = "EC_CODEC_DMIC_GET_MAX_GAIN",
+	[EC_CODEC_DMIC_SET_GAIN_IDX] = "EC_CODEC_DMIC_SET_GAIN_IDX",
+	[EC_CODEC_DMIC_GET_GAIN_IDX] = "EC_CODEC_DMIC_GET_GAIN_IDX",
+};
+BUILD_ASSERT(ARRAY_SIZE(sub_cmds) == ARRAY_SIZE(strcmd));
+#endif
+
+static int dmic_host_command(struct host_cmd_handler_args *args)
+{
+	const struct ec_param_ec_codec_dmic *p = args->params;
+
+#ifdef DEBUG_AUDIO_CODEC
+	CPRINTS("DMIC subcommand: %s", strcmd[p->cmd]);
+#endif
+
+	if (p->cmd < EC_CODEC_DMIC_SUBCMD_COUNT)
+		return sub_cmds[p->cmd](args);
+
+	return EC_RES_INVALID_PARAM;
+}
+DECLARE_HOST_COMMAND(EC_CMD_EC_CODEC_DMIC, dmic_host_command, EC_VER_MASK(0));
diff --git a/common/build.mk b/common/build.mk
index 213db0a0fc..8398434b47 100644
--- a/common/build.mk
+++ b/common/build.mk
@@ -30,6 +30,7 @@ common-$(CONFIG_CMD_ADC)+=adc.o
 common-$(HAS_TASK_ALS)+=als.o
 common-$(CONFIG_AP_HANG_DETECT)+=ap_hang_detect.o
 common-$(CONFIG_AUDIO_CODEC)+=audio_codec.o
+common-$(CONFIG_AUDIO_CODEC_DMIC)+=audio_codec_dmic.o
 common-$(CONFIG_BACKLIGHT_LID)+=backlight_lid.o
 common-$(CONFIG_BASE32)+=base32.o
 common-$(CONFIG_DETACHABLE_BASE)+=base_state.o