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-rw-r--r--sound/soc/soc-acpi.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
new file mode 100644
index 0000000..f21df28
--- /dev/null
+++ b/sound/soc/soc-acpi.c
@@ -0,0 +1,175 @@
+/*
+ * soc-apci.c - support for ACPI enumeration.
+ *
+ * Copyright (c) 2013-15, Intel Corporation.
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <sound/soc-acpi.h>
+
+static acpi_status snd_soc_acpi_find_name(acpi_handle handle, u32 level,
+ void *context, void **ret)
+{
+ struct acpi_device *adev;
+ const char *name = NULL;
+
+ if (acpi_bus_get_device(handle, &adev))
+ return AE_OK;
+
+ if (adev->status.present && adev->status.functional) {
+ name = acpi_dev_name(adev);
+ *(const char **)ret = name;
+ return AE_CTRL_TERMINATE;
+ }
+
+ return AE_OK;
+}
+
+const char *snd_soc_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN])
+{
+ const char *name = NULL;
+ acpi_status status;
+
+ status = acpi_get_devices(hid, snd_soc_acpi_find_name, NULL,
+ (void **)&name);
+
+ if (ACPI_FAILURE(status) || name[0] == '\0')
+ return NULL;
+
+ return name;
+}
+EXPORT_SYMBOL_GPL(snd_soc_acpi_find_name_from_hid);
+
+static acpi_status snd_soc_acpi_mach_match(acpi_handle handle, u32 level,
+ void *context, void **ret)
+{
+ unsigned long long sta;
+ acpi_status status;
+
+ *(bool *)context = true;
+ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+ if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
+ *(bool *)context = false;
+
+ return AE_OK;
+}
+
+bool snd_soc_acpi_check_hid(const u8 hid[ACPI_ID_LEN])
+{
+ acpi_status status;
+ bool found = false;
+
+ status = acpi_get_devices(hid, snd_soc_acpi_mach_match, &found, NULL);
+
+ if (ACPI_FAILURE(status))
+ return false;
+
+ return found;
+}
+EXPORT_SYMBOL_GPL(snd_soc_acpi_check_hid);
+
+struct snd_soc_acpi_mach *
+snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
+{
+ struct snd_soc_acpi_mach *mach;
+
+ for (mach = machines; mach->id[0]; mach++) {
+ if (snd_soc_acpi_check_hid(mach->id) == true) {
+ if (mach->machine_quirk == NULL)
+ return mach;
+
+ if (mach->machine_quirk(mach) != NULL)
+ return mach;
+ }
+ }
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
+
+static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
+ void *context, void **ret)
+{
+ struct acpi_device *adev;
+ acpi_status status = AE_OK;
+ struct snd_soc_acpi_package_context *pkg_ctx = context;
+
+ pkg_ctx->data_valid = false;
+
+ if (acpi_bus_get_device(handle, &adev))
+ return AE_OK;
+
+ if (adev->status.present && adev->status.functional) {
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ union acpi_object *myobj = NULL;
+
+ status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
+ NULL, &buffer,
+ ACPI_TYPE_PACKAGE);
+ if (ACPI_FAILURE(status))
+ return AE_OK;
+
+ myobj = buffer.pointer;
+ if (!myobj || myobj->package.count != pkg_ctx->length) {
+ kfree(buffer.pointer);
+ return AE_OK;
+ }
+
+ status = acpi_extract_package(myobj,
+ pkg_ctx->format, pkg_ctx->state);
+ if (ACPI_FAILURE(status)) {
+ kfree(buffer.pointer);
+ return AE_OK;
+ }
+
+ kfree(buffer.pointer);
+ pkg_ctx->data_valid = true;
+ return AE_CTRL_TERMINATE;
+ }
+
+ return AE_OK;
+}
+
+bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
+ struct snd_soc_acpi_package_context *ctx)
+{
+ acpi_status status;
+
+ status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
+
+ if (ACPI_FAILURE(status) || !ctx->data_valid)
+ return false;
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
+
+struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
+{
+ struct snd_soc_acpi_mach *mach = arg;
+ struct snd_soc_acpi_codecs *codec_list =
+ (struct snd_soc_acpi_codecs *) mach->quirk_data;
+ int i;
+
+ if (mach->quirk_data == NULL)
+ return mach;
+
+ for (i = 0; i < codec_list->num_codecs; i++) {
+ if (snd_soc_acpi_check_hid(codec_list->codecs[i]) != true)
+ return NULL;
+ }
+
+ return mach;
+}
+EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ALSA SoC ACPI module");
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