diff options
Diffstat (limited to 'sound/soc/intel/common/sst-match-acpi.c')
-rw-r--r-- | sound/soc/intel/common/sst-match-acpi.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/sound/soc/intel/common/sst-match-acpi.c b/sound/soc/intel/common/sst-match-acpi.c new file mode 100644 index 000000000000..789843307a49 --- /dev/null +++ b/sound/soc/intel/common/sst-match-acpi.c @@ -0,0 +1,81 @@ +/* + * sst_match_apci.c - SST (LPE) match 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 "sst-acpi.h" + +static acpi_status sst_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 *sst_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN]) +{ + const char *name = NULL; + acpi_status status; + + status = acpi_get_devices(hid, sst_acpi_find_name, NULL, + (void **)&name); + + if (ACPI_FAILURE(status) || name[0] == '\0') + return NULL; + + return name; +} +EXPORT_SYMBOL_GPL(sst_acpi_find_name_from_hid); + +static acpi_status sst_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; +} + +struct sst_acpi_mach *sst_acpi_find_machine(struct sst_acpi_mach *machines) +{ + struct sst_acpi_mach *mach; + bool found = false; + + for (mach = machines; mach->id[0]; mach++) + if (ACPI_SUCCESS(acpi_get_devices(mach->id, + sst_acpi_mach_match, + &found, NULL)) && found) + return mach; + return NULL; +} +EXPORT_SYMBOL_GPL(sst_acpi_find_machine); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Intel Common ACPI Match module"); |