2 * sst_match_apci.c - SST (LPE) match for ACPI enumeration.
4 * Copyright (c) 2013-15, Intel Corporation.
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 static acpi_status sst_acpi_find_name(acpi_handle handle, u32 level,
20 void *context, void **ret)
22 struct acpi_device *adev;
23 const char *name = NULL;
25 if (acpi_bus_get_device(handle, &adev))
28 if (adev->status.present && adev->status.functional) {
29 name = acpi_dev_name(adev);
30 *(const char **)ret = name;
31 return AE_CTRL_TERMINATE;
37 const char *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN])
39 const char *name = NULL;
42 status = acpi_get_devices(hid, sst_acpi_find_name, NULL,
45 if (ACPI_FAILURE(status) || name[0] == '\0')
50 EXPORT_SYMBOL_GPL(sst_acpi_find_name_from_hid);
52 static acpi_status sst_acpi_mach_match(acpi_handle handle, u32 level,
53 void *context, void **ret)
55 unsigned long long sta;
58 *(bool *)context = true;
59 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
60 if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
61 *(bool *)context = false;
66 struct sst_acpi_mach *sst_acpi_find_machine(struct sst_acpi_mach *machines)
68 struct sst_acpi_mach *mach;
71 for (mach = machines; mach->id[0]; mach++)
72 if (ACPI_SUCCESS(acpi_get_devices(mach->id,
74 &found, NULL)) && found)
78 EXPORT_SYMBOL_GPL(sst_acpi_find_machine);
80 static acpi_status sst_acpi_find_package(acpi_handle handle, u32 level,
81 void *context, void **ret)
83 struct acpi_device *adev;
84 acpi_status status = AE_OK;
85 struct sst_acpi_package_context *pkg_ctx = context;
87 pkg_ctx->data_valid = false;
89 if (acpi_bus_get_device(handle, &adev))
92 if (adev->status.present && adev->status.functional) {
93 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
94 union acpi_object *myobj = NULL;
96 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
99 if (ACPI_FAILURE(status))
102 myobj = buffer.pointer;
103 if (!myobj || myobj->package.count != pkg_ctx->length) {
104 kfree(buffer.pointer);
108 status = acpi_extract_package(myobj,
109 pkg_ctx->format, pkg_ctx->state);
110 if (ACPI_FAILURE(status)) {
111 kfree(buffer.pointer);
115 kfree(buffer.pointer);
116 pkg_ctx->data_valid = true;
117 return AE_CTRL_TERMINATE;
123 bool sst_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
124 struct sst_acpi_package_context *ctx)
128 status = acpi_get_devices(hid, sst_acpi_find_package, ctx, NULL);
130 if (ACPI_FAILURE(status) || !ctx->data_valid)
135 EXPORT_SYMBOL_GPL(sst_acpi_find_package_from_hid);
137 MODULE_LICENSE("GPL v2");
138 MODULE_DESCRIPTION("Intel Common ACPI Match module");