diff options
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 63 |
1 files changed, 44 insertions, 19 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 7b26b6ccf1a0..784cea8572c2 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * ACPI-WMI mapping driver * @@ -11,24 +12,6 @@ * WMI bus infrastructure by Andrew Lutomirski and Darren Hart: * Copyright (C) 2015 Andrew Lutomirski * Copyright (C) 2017 VMware, Inc. All Rights Reserved. - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or (at - * your option) any later version. - * - * This program is distributed in the hope that 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. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt @@ -146,6 +129,28 @@ static bool find_guid(const char *guid_string, struct wmi_block **out) return false; } +static const void *find_guid_context(struct wmi_block *wblock, + struct wmi_driver *wdriver) +{ + const struct wmi_device_id *id; + uuid_le guid_input; + + if (wblock == NULL || wdriver == NULL) + return NULL; + if (wdriver->id_table == NULL) + return NULL; + + id = wdriver->id_table; + while (*id->guid_string) { + if (uuid_le_to_bin(id->guid_string, &guid_input)) + continue; + if (!memcmp(wblock->gblock.guid, &guid_input, 16)) + return id->context; + id++; + } + return NULL; +} + static int get_subobj_info(acpi_handle handle, const char *pathname, struct acpi_device_info **info) { @@ -635,6 +640,25 @@ bool wmi_has_guid(const char *guid_string) } EXPORT_SYMBOL_GPL(wmi_has_guid); +/** + * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID + * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba + * + * Find the _UID of ACPI device associated with this WMI GUID. + * + * Return: The ACPI _UID field value or NULL if the WMI GUID was not found + */ +char *wmi_get_acpi_device_uid(const char *guid_string) +{ + struct wmi_block *wblock = NULL; + + if (!find_guid(guid_string, &wblock)) + return NULL; + + return acpi_device_uid(wblock->acpi_device); +} +EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid); + static struct wmi_block *dev_to_wblock(struct device *dev) { return container_of(dev, struct wmi_block, dev.dev); @@ -904,7 +928,8 @@ static int wmi_dev_probe(struct device *dev) dev_warn(dev, "failed to enable device -- probing anyway\n"); if (wdriver->probe) { - ret = wdriver->probe(dev_to_wdev(dev)); + ret = wdriver->probe(dev_to_wdev(dev), + find_guid_context(wblock, wdriver)); if (ret != 0) goto probe_failure; } |