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authorFurquan Shaikh <furquan@google.com>2020-07-02 15:59:08 -0700
committerFurquan Shaikh <furquan@google.com>2020-07-05 18:34:02 +0000
commit31b816b42f913ad964fb9e41e77690cd8e6b317b (patch)
treee717fbdf28c0adf717dc2ed1d59a72e4c6402002 /src/ec/google/chromeec
parentdfd7e9d560b24a193e8bcfb51782e99e6c4a9142 (diff)
downloadcoreboot-31b816b42f913ad964fb9e41e77690cd8e6b317b.tar.xz
ec/google/chromeec: Add driver for audio codec device
This change adds driver for audio codec device (HID `GOOG0013`) living behind Chrome EC. This driver generates the required ACPI node for the codec device. In a later change, GOOG0013 device will be dropped the .asl file. Change-Id: Ib2759eac60265ef81df70af1d4f1f72bd9d987e8 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/43041 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/ec/google/chromeec')
-rw-r--r--src/ec/google/chromeec/Makefile.inc1
-rw-r--r--src/ec/google/chromeec/audio_codec/Kconfig10
-rw-r--r--src/ec/google/chromeec/audio_codec/Makefile.inc1
-rw-r--r--src/ec/google/chromeec/audio_codec/audio_codec.c64
-rw-r--r--src/ec/google/chromeec/audio_codec/chip.h13
5 files changed, 89 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/Makefile.inc b/src/ec/google/chromeec/Makefile.inc
index b11f5c8507..1f7e03d88e 100644
--- a/src/ec/google/chromeec/Makefile.inc
+++ b/src/ec/google/chromeec/Makefile.inc
@@ -1,5 +1,6 @@
ifeq ($(CONFIG_EC_GOOGLE_CHROMEEC),y)
+subdirs-y += audio_codec
subdirs-y += i2c_tunnel
bootblock-$(CONFIG_EC_GOOGLE_CHROMEEC_BOARDID) += ec_boardid.c
diff --git a/src/ec/google/chromeec/audio_codec/Kconfig b/src/ec/google/chromeec/audio_codec/Kconfig
new file mode 100644
index 0000000000..148a7a8d96
--- /dev/null
+++ b/src/ec/google/chromeec/audio_codec/Kconfig
@@ -0,0 +1,10 @@
+if EC_GOOGLE_CHROMEEC
+
+config EC_GOOGLE_CHROMEEC_AUDIO_CODEC
+ bool
+ depends on HAVE_ACPI_TABLES
+ help
+ This enables the Cros EC audio codec driver that is required to fill the
+ SSDT nodes for the codec device used by the mainboard.
+
+endif
diff --git a/src/ec/google/chromeec/audio_codec/Makefile.inc b/src/ec/google/chromeec/audio_codec/Makefile.inc
new file mode 100644
index 0000000000..8726b928b5
--- /dev/null
+++ b/src/ec/google/chromeec/audio_codec/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_EC_GOOGLE_CHROMEEC_AUDIO_CODEC) += audio_codec.c
diff --git a/src/ec/google/chromeec/audio_codec/audio_codec.c b/src/ec/google/chromeec/audio_codec/audio_codec.c
new file mode 100644
index 0000000000..612b1f6995
--- /dev/null
+++ b/src/ec/google/chromeec/audio_codec/audio_codec.c
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <acpi/acpi_device.h>
+#include <acpi/acpigen.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/path.h>
+#include "chip.h"
+
+#define CROS_EC_AUDIO_CODEC_HID "GOOG0013"
+#define CROS_EC_AUDIO_CODEC_DDN "Cros EC audio codec"
+
+static void crosec_audio_codec_fill_ssdt(const struct device *dev)
+{
+ const char *scope = acpi_device_scope(dev);
+ struct ec_google_chromeec_audio_codec_config *cfg = dev->chip_info;
+
+ if (!dev->enabled || !scope || !cfg)
+ return;
+
+ acpigen_write_scope(scope);
+
+ acpigen_write_device(acpi_device_name(dev));
+ acpigen_write_name_string("_HID", CROS_EC_AUDIO_CODEC_HID);
+ acpigen_write_name_integer("_UID", cfg->uid);
+ acpigen_write_name_string("_DDN", CROS_EC_AUDIO_CODEC_DDN);
+ acpigen_write_STA(acpi_device_status(dev));
+
+ acpigen_pop_len(); /* Device */
+ acpigen_pop_len(); /* Scope */
+
+ printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), CROS_EC_AUDIO_CODEC_DDN,
+ dev_path(dev));
+}
+
+static const char *crosec_audio_codec_acpi_name(const struct device *dev)
+{
+ struct ec_google_chromeec_audio_codec_config *cfg = dev->chip_info;
+ static char name[5];
+
+ if (cfg->name)
+ return cfg->name;
+
+ snprintf(name, sizeof(name), "ECA%X", dev->path.generic.id);
+ return name;
+}
+
+static struct device_operations crosec_audio_codec_ops = {
+ .read_resources = noop_read_resources,
+ .set_resources = noop_set_resources,
+ .acpi_name = crosec_audio_codec_acpi_name,
+ .acpi_fill_ssdt = crosec_audio_codec_fill_ssdt,
+ .scan_bus = scan_static_bus,
+};
+
+static void crosec_audio_codec_enable(struct device *dev)
+{
+ dev->ops = &crosec_audio_codec_ops;
+}
+
+struct chip_operations ec_google_chromeec_audio_codec_ops = {
+ CHIP_NAME("CrosEC Audio Codec Device")
+ .enable_dev = crosec_audio_codec_enable
+};
diff --git a/src/ec/google/chromeec/audio_codec/chip.h b/src/ec/google/chromeec/audio_codec/chip.h
new file mode 100644
index 0000000000..30a83ef6d8
--- /dev/null
+++ b/src/ec/google/chromeec/audio_codec/chip.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __EC_GOOGLE_CHROMEEC_AUDIO_CODEC__
+#define __EC_GOOGLE_CHROMEEC_AUDIO_CODEC__
+
+struct ec_google_chromeec_audio_codec_config {
+ /* ACPI device name */
+ const char *name;
+ /* ACPI _UID */
+ unsigned int uid;
+};
+
+#endif /* __EC_GOOGLE_CHROMEEC_AUDIO_CODEC__ */