![Joe Perches](/assets/img/avatar_default.png)
%pULL doesn't officially exist but %pUL does. Miscellanea: o Add missing newlines to a couple logging messages Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
1452 lines
35 KiB
C
1452 lines
35 KiB
C
/*
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* ACPI-WMI mapping driver
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*
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* Copyright (C) 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk>
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*
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* GUID parsing code from ldm.c is:
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* Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
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* Copyright (c) 2001-2007 Anton Altaparmakov
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* Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
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*
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* WMI bus infrastructure by Andrew Lutomirski and Darren Hart:
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* Copyright (C) 2015 Andrew Lutomirski
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* Copyright (C) 2017 VMware, Inc. All Rights Reserved.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/uuid.h>
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#include <linux/wmi.h>
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#include <uapi/linux/wmi.h>
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ACPI_MODULE_NAME("wmi");
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MODULE_AUTHOR("Carlos Corbacho");
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MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
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MODULE_LICENSE("GPL");
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static LIST_HEAD(wmi_block_list);
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struct guid_block {
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char guid[16];
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union {
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char object_id[2];
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struct {
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unsigned char notify_id;
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unsigned char reserved;
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};
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};
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u8 instance_count;
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u8 flags;
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};
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struct wmi_block {
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struct wmi_device dev;
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struct list_head list;
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struct guid_block gblock;
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struct miscdevice char_dev;
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struct mutex char_mutex;
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struct acpi_device *acpi_device;
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wmi_notify_handler handler;
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void *handler_data;
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u64 req_buf_size;
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bool read_takes_no_args;
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};
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/*
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* If the GUID data block is marked as expensive, we must enable and
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* explicitily disable data collection.
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*/
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#define ACPI_WMI_EXPENSIVE 0x1
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#define ACPI_WMI_METHOD 0x2 /* GUID is a method */
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#define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */
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#define ACPI_WMI_EVENT 0x8 /* GUID is an event */
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static bool debug_event;
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module_param(debug_event, bool, 0444);
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MODULE_PARM_DESC(debug_event,
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"Log WMI Events [0/1]");
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static bool debug_dump_wdg;
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module_param(debug_dump_wdg, bool, 0444);
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MODULE_PARM_DESC(debug_dump_wdg,
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"Dump available WMI interfaces [0/1]");
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static int acpi_wmi_remove(struct platform_device *device);
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static int acpi_wmi_probe(struct platform_device *device);
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static const struct acpi_device_id wmi_device_ids[] = {
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{"PNP0C14", 0},
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{"pnp0c14", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
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static struct platform_driver acpi_wmi_driver = {
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.driver = {
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.name = "acpi-wmi",
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.acpi_match_table = wmi_device_ids,
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},
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.probe = acpi_wmi_probe,
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.remove = acpi_wmi_remove,
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};
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/*
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* GUID parsing functions
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*/
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static bool find_guid(const char *guid_string, struct wmi_block **out)
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{
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uuid_le guid_input;
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struct wmi_block *wblock;
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struct guid_block *block;
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if (uuid_le_to_bin(guid_string, &guid_input))
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return false;
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list_for_each_entry(wblock, &wmi_block_list, list) {
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block = &wblock->gblock;
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if (memcmp(block->guid, &guid_input, 16) == 0) {
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if (out)
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*out = wblock;
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return true;
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}
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}
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return false;
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}
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static int get_subobj_info(acpi_handle handle, const char *pathname,
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struct acpi_device_info **info)
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{
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struct acpi_device_info *dummy_info, **info_ptr;
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acpi_handle subobj_handle;
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acpi_status status;
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status = acpi_get_handle(handle, (char *)pathname, &subobj_handle);
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if (status == AE_NOT_FOUND)
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return -ENOENT;
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else if (ACPI_FAILURE(status))
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return -EIO;
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info_ptr = info ? info : &dummy_info;
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status = acpi_get_object_info(subobj_handle, info_ptr);
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if (ACPI_FAILURE(status))
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return -EIO;
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if (!info)
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kfree(dummy_info);
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return 0;
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}
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static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
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{
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struct guid_block *block = NULL;
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char method[5];
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acpi_status status;
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acpi_handle handle;
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block = &wblock->gblock;
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handle = wblock->acpi_device->handle;
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snprintf(method, 5, "WE%02X", block->notify_id);
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status = acpi_execute_simple_method(handle, method, enable);
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if (status != AE_OK && status != AE_NOT_FOUND)
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return status;
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else
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return AE_OK;
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}
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/*
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* Exported WMI functions
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*/
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/**
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* set_required_buffer_size - Sets the buffer size needed for performing IOCTL
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* @wdev: A wmi bus device from a driver
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* @instance: Instance index
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*
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* Allocates memory needed for buffer, stores the buffer size in that memory
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*/
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int set_required_buffer_size(struct wmi_device *wdev, u64 length)
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{
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struct wmi_block *wblock;
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wblock = container_of(wdev, struct wmi_block, dev);
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wblock->req_buf_size = length;
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return 0;
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}
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EXPORT_SYMBOL_GPL(set_required_buffer_size);
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/**
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* wmi_evaluate_method - Evaluate a WMI method
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* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
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* @instance: Instance index
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* @method_id: Method ID to call
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* &in: Buffer containing input for the method call
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* &out: Empty buffer to return the method results
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*
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* Call an ACPI-WMI method
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*/
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acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
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u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
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{
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struct wmi_block *wblock = NULL;
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if (!find_guid(guid_string, &wblock))
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return AE_ERROR;
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return wmidev_evaluate_method(&wblock->dev, instance, method_id,
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in, out);
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}
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EXPORT_SYMBOL_GPL(wmi_evaluate_method);
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/**
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* wmidev_evaluate_method - Evaluate a WMI method
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* @wdev: A wmi bus device from a driver
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* @instance: Instance index
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* @method_id: Method ID to call
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* &in: Buffer containing input for the method call
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* &out: Empty buffer to return the method results
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*
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* Call an ACPI-WMI method
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*/
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acpi_status wmidev_evaluate_method(struct wmi_device *wdev, u8 instance,
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u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
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{
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struct guid_block *block = NULL;
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struct wmi_block *wblock = NULL;
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acpi_handle handle;
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acpi_status status;
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struct acpi_object_list input;
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union acpi_object params[3];
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char method[5] = "WM";
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wblock = container_of(wdev, struct wmi_block, dev);
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block = &wblock->gblock;
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handle = wblock->acpi_device->handle;
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if (!(block->flags & ACPI_WMI_METHOD))
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return AE_BAD_DATA;
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if (block->instance_count <= instance)
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return AE_BAD_PARAMETER;
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input.count = 2;
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input.pointer = params;
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params[0].type = ACPI_TYPE_INTEGER;
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params[0].integer.value = instance;
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params[1].type = ACPI_TYPE_INTEGER;
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params[1].integer.value = method_id;
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if (in) {
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input.count = 3;
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if (block->flags & ACPI_WMI_STRING) {
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params[2].type = ACPI_TYPE_STRING;
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} else {
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params[2].type = ACPI_TYPE_BUFFER;
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}
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params[2].buffer.length = in->length;
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params[2].buffer.pointer = in->pointer;
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}
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strncat(method, block->object_id, 2);
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status = acpi_evaluate_object(handle, method, &input, out);
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return status;
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}
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EXPORT_SYMBOL_GPL(wmidev_evaluate_method);
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static acpi_status __query_block(struct wmi_block *wblock, u8 instance,
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struct acpi_buffer *out)
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{
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struct guid_block *block = NULL;
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acpi_handle handle;
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acpi_status status, wc_status = AE_ERROR;
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struct acpi_object_list input;
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union acpi_object wq_params[1];
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char method[5];
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char wc_method[5] = "WC";
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if (!out)
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return AE_BAD_PARAMETER;
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block = &wblock->gblock;
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handle = wblock->acpi_device->handle;
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if (block->instance_count <= instance)
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return AE_BAD_PARAMETER;
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/* Check GUID is a data block */
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if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
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return AE_ERROR;
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input.count = 1;
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input.pointer = wq_params;
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wq_params[0].type = ACPI_TYPE_INTEGER;
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wq_params[0].integer.value = instance;
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if (instance == 0 && wblock->read_takes_no_args)
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input.count = 0;
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/*
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* If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to
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* enable collection.
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*/
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if (block->flags & ACPI_WMI_EXPENSIVE) {
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strncat(wc_method, block->object_id, 2);
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/*
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* Some GUIDs break the specification by declaring themselves
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* expensive, but have no corresponding WCxx method. So we
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* should not fail if this happens.
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*/
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if (acpi_has_method(handle, wc_method))
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wc_status = acpi_execute_simple_method(handle,
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wc_method, 1);
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}
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strcpy(method, "WQ");
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strncat(method, block->object_id, 2);
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status = acpi_evaluate_object(handle, method, &input, out);
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/*
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* If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if
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* the WQxx method failed - we should disable collection anyway.
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*/
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if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
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status = acpi_execute_simple_method(handle, wc_method, 0);
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}
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return status;
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}
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/**
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* wmi_query_block - Return contents of a WMI block (deprecated)
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* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
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* @instance: Instance index
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* &out: Empty buffer to return the contents of the data block to
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*
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* Return the contents of an ACPI-WMI data block to a buffer
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*/
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acpi_status wmi_query_block(const char *guid_string, u8 instance,
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struct acpi_buffer *out)
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{
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struct wmi_block *wblock;
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if (!guid_string)
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return AE_BAD_PARAMETER;
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if (!find_guid(guid_string, &wblock))
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return AE_ERROR;
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return __query_block(wblock, instance, out);
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}
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EXPORT_SYMBOL_GPL(wmi_query_block);
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union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance)
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{
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struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL };
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struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev);
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if (ACPI_FAILURE(__query_block(wblock, instance, &out)))
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return NULL;
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return (union acpi_object *)out.pointer;
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}
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EXPORT_SYMBOL_GPL(wmidev_block_query);
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/**
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* wmi_set_block - Write to a WMI block
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* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
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* @instance: Instance index
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* &in: Buffer containing new values for the data block
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*
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* Write the contents of the input buffer to an ACPI-WMI data block
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*/
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acpi_status wmi_set_block(const char *guid_string, u8 instance,
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const struct acpi_buffer *in)
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{
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struct guid_block *block = NULL;
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struct wmi_block *wblock = NULL;
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acpi_handle handle;
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struct acpi_object_list input;
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union acpi_object params[2];
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char method[5] = "WS";
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if (!guid_string || !in)
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return AE_BAD_DATA;
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if (!find_guid(guid_string, &wblock))
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return AE_ERROR;
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block = &wblock->gblock;
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handle = wblock->acpi_device->handle;
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if (block->instance_count <= instance)
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return AE_BAD_PARAMETER;
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/* Check GUID is a data block */
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if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
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return AE_ERROR;
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input.count = 2;
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input.pointer = params;
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params[0].type = ACPI_TYPE_INTEGER;
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params[0].integer.value = instance;
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if (block->flags & ACPI_WMI_STRING) {
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params[1].type = ACPI_TYPE_STRING;
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} else {
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params[1].type = ACPI_TYPE_BUFFER;
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}
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params[1].buffer.length = in->length;
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params[1].buffer.pointer = in->pointer;
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strncat(method, block->object_id, 2);
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return acpi_evaluate_object(handle, method, &input, NULL);
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}
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EXPORT_SYMBOL_GPL(wmi_set_block);
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static void wmi_dump_wdg(const struct guid_block *g)
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{
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pr_info("%pUL:\n", g->guid);
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if (g->flags & ACPI_WMI_EVENT)
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pr_info("\tnotify_id: 0x%02X\n", g->notify_id);
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else
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pr_info("\tobject_id: %2pE\n", g->object_id);
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pr_info("\tinstance_count: %d\n", g->instance_count);
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pr_info("\tflags: %#x", g->flags);
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if (g->flags) {
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if (g->flags & ACPI_WMI_EXPENSIVE)
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pr_cont(" ACPI_WMI_EXPENSIVE");
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if (g->flags & ACPI_WMI_METHOD)
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pr_cont(" ACPI_WMI_METHOD");
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if (g->flags & ACPI_WMI_STRING)
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pr_cont(" ACPI_WMI_STRING");
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if (g->flags & ACPI_WMI_EVENT)
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pr_cont(" ACPI_WMI_EVENT");
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}
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pr_cont("\n");
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}
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static void wmi_notify_debug(u32 value, void *context)
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{
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struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *obj;
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acpi_status status;
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status = wmi_get_event_data(value, &response);
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if (status != AE_OK) {
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pr_info("bad event status 0x%x\n", status);
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return;
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}
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obj = (union acpi_object *)response.pointer;
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if (!obj)
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return;
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pr_info("DEBUG Event ");
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switch(obj->type) {
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case ACPI_TYPE_BUFFER:
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pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length);
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break;
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case ACPI_TYPE_STRING:
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pr_cont("STRING_TYPE - %s\n", obj->string.pointer);
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break;
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case ACPI_TYPE_INTEGER:
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pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value);
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break;
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case ACPI_TYPE_PACKAGE:
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pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count);
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break;
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default:
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pr_cont("object type 0x%X\n", obj->type);
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}
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kfree(obj);
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}
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/**
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* wmi_install_notify_handler - Register handler for WMI events
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* @handler: Function to handle notifications
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* @data: Data to be returned to handler when event is fired
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*
|
|
* Register a handler for events sent to the ACPI-WMI mapper device.
|
|
*/
|
|
acpi_status wmi_install_notify_handler(const char *guid,
|
|
wmi_notify_handler handler, void *data)
|
|
{
|
|
struct wmi_block *block;
|
|
acpi_status status = AE_NOT_EXIST;
|
|
uuid_le guid_input;
|
|
|
|
if (!guid || !handler)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (uuid_le_to_bin(guid, &guid_input))
|
|
return AE_BAD_PARAMETER;
|
|
|
|
list_for_each_entry(block, &wmi_block_list, list) {
|
|
acpi_status wmi_status;
|
|
|
|
if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
|
|
if (block->handler &&
|
|
block->handler != wmi_notify_debug)
|
|
return AE_ALREADY_ACQUIRED;
|
|
|
|
block->handler = handler;
|
|
block->handler_data = data;
|
|
|
|
wmi_status = wmi_method_enable(block, 1);
|
|
if ((wmi_status != AE_OK) ||
|
|
((wmi_status == AE_OK) && (status == AE_NOT_EXIST)))
|
|
status = wmi_status;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
|
|
|
|
/**
|
|
* wmi_uninstall_notify_handler - Unregister handler for WMI events
|
|
*
|
|
* Unregister handler for events sent to the ACPI-WMI mapper device.
|
|
*/
|
|
acpi_status wmi_remove_notify_handler(const char *guid)
|
|
{
|
|
struct wmi_block *block;
|
|
acpi_status status = AE_NOT_EXIST;
|
|
uuid_le guid_input;
|
|
|
|
if (!guid)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (uuid_le_to_bin(guid, &guid_input))
|
|
return AE_BAD_PARAMETER;
|
|
|
|
list_for_each_entry(block, &wmi_block_list, list) {
|
|
acpi_status wmi_status;
|
|
|
|
if (memcmp(block->gblock.guid, &guid_input, 16) == 0) {
|
|
if (!block->handler ||
|
|
block->handler == wmi_notify_debug)
|
|
return AE_NULL_ENTRY;
|
|
|
|
if (debug_event) {
|
|
block->handler = wmi_notify_debug;
|
|
status = AE_OK;
|
|
} else {
|
|
wmi_status = wmi_method_enable(block, 0);
|
|
block->handler = NULL;
|
|
block->handler_data = NULL;
|
|
if ((wmi_status != AE_OK) ||
|
|
((wmi_status == AE_OK) &&
|
|
(status == AE_NOT_EXIST)))
|
|
status = wmi_status;
|
|
}
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
|
|
|
|
/**
|
|
* wmi_get_event_data - Get WMI data associated with an event
|
|
*
|
|
* @event: Event to find
|
|
* @out: Buffer to hold event data. out->pointer should be freed with kfree()
|
|
*
|
|
* Returns extra data associated with an event in WMI.
|
|
*/
|
|
acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
|
|
{
|
|
struct acpi_object_list input;
|
|
union acpi_object params[1];
|
|
struct guid_block *gblock;
|
|
struct wmi_block *wblock;
|
|
|
|
input.count = 1;
|
|
input.pointer = params;
|
|
params[0].type = ACPI_TYPE_INTEGER;
|
|
params[0].integer.value = event;
|
|
|
|
list_for_each_entry(wblock, &wmi_block_list, list) {
|
|
gblock = &wblock->gblock;
|
|
|
|
if ((gblock->flags & ACPI_WMI_EVENT) &&
|
|
(gblock->notify_id == event))
|
|
return acpi_evaluate_object(wblock->acpi_device->handle,
|
|
"_WED", &input, out);
|
|
}
|
|
|
|
return AE_NOT_FOUND;
|
|
}
|
|
EXPORT_SYMBOL_GPL(wmi_get_event_data);
|
|
|
|
/**
|
|
* wmi_has_guid - Check if a GUID is available
|
|
* @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
|
|
*
|
|
* Check if a given GUID is defined by _WDG
|
|
*/
|
|
bool wmi_has_guid(const char *guid_string)
|
|
{
|
|
return find_guid(guid_string, NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(wmi_has_guid);
|
|
|
|
static struct wmi_block *dev_to_wblock(struct device *dev)
|
|
{
|
|
return container_of(dev, struct wmi_block, dev.dev);
|
|
}
|
|
|
|
static struct wmi_device *dev_to_wdev(struct device *dev)
|
|
{
|
|
return container_of(dev, struct wmi_device, dev);
|
|
}
|
|
|
|
/*
|
|
* sysfs interface
|
|
*/
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
return sprintf(buf, "wmi:%pUL\n", wblock->gblock.guid);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static ssize_t guid_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
return sprintf(buf, "%pUL\n", wblock->gblock.guid);
|
|
}
|
|
static DEVICE_ATTR_RO(guid);
|
|
|
|
static ssize_t instance_count_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
return sprintf(buf, "%d\n", (int)wblock->gblock.instance_count);
|
|
}
|
|
static DEVICE_ATTR_RO(instance_count);
|
|
|
|
static ssize_t expensive_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
return sprintf(buf, "%d\n",
|
|
(wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0);
|
|
}
|
|
static DEVICE_ATTR_RO(expensive);
|
|
|
|
static struct attribute *wmi_attrs[] = {
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_guid.attr,
|
|
&dev_attr_instance_count.attr,
|
|
&dev_attr_expensive.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(wmi);
|
|
|
|
static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
return sprintf(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id);
|
|
}
|
|
static DEVICE_ATTR_RO(notify_id);
|
|
|
|
static struct attribute *wmi_event_attrs[] = {
|
|
&dev_attr_notify_id.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(wmi_event);
|
|
|
|
static ssize_t object_id_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
return sprintf(buf, "%c%c\n", wblock->gblock.object_id[0],
|
|
wblock->gblock.object_id[1]);
|
|
}
|
|
static DEVICE_ATTR_RO(object_id);
|
|
|
|
static ssize_t setable_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct wmi_device *wdev = dev_to_wdev(dev);
|
|
|
|
return sprintf(buf, "%d\n", (int)wdev->setable);
|
|
}
|
|
static DEVICE_ATTR_RO(setable);
|
|
|
|
static struct attribute *wmi_data_attrs[] = {
|
|
&dev_attr_object_id.attr,
|
|
&dev_attr_setable.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(wmi_data);
|
|
|
|
static struct attribute *wmi_method_attrs[] = {
|
|
&dev_attr_object_id.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(wmi_method);
|
|
|
|
static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
if (add_uevent_var(env, "MODALIAS=wmi:%pUL", wblock->gblock.guid))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "WMI_GUID=%pUL", wblock->gblock.guid))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void wmi_dev_release(struct device *dev)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
|
|
kfree(wblock);
|
|
}
|
|
|
|
static int wmi_dev_match(struct device *dev, struct device_driver *driver)
|
|
{
|
|
struct wmi_driver *wmi_driver =
|
|
container_of(driver, struct wmi_driver, driver);
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
const struct wmi_device_id *id = wmi_driver->id_table;
|
|
|
|
while (id->guid_string) {
|
|
uuid_le driver_guid;
|
|
|
|
if (WARN_ON(uuid_le_to_bin(id->guid_string, &driver_guid)))
|
|
continue;
|
|
if (!memcmp(&driver_guid, wblock->gblock.guid, 16))
|
|
return 1;
|
|
|
|
id++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
static int wmi_char_open(struct inode *inode, struct file *filp)
|
|
{
|
|
const char *driver_name = filp->f_path.dentry->d_iname;
|
|
struct wmi_block *wblock = NULL;
|
|
struct wmi_block *next = NULL;
|
|
|
|
list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
|
|
if (!wblock->dev.dev.driver)
|
|
continue;
|
|
if (strcmp(driver_name, wblock->dev.dev.driver->name) == 0) {
|
|
filp->private_data = wblock;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!filp->private_data)
|
|
return -ENODEV;
|
|
|
|
return nonseekable_open(inode, filp);
|
|
}
|
|
|
|
static ssize_t wmi_char_read(struct file *filp, char __user *buffer,
|
|
size_t length, loff_t *offset)
|
|
{
|
|
struct wmi_block *wblock = filp->private_data;
|
|
|
|
return simple_read_from_buffer(buffer, length, offset,
|
|
&wblock->req_buf_size,
|
|
sizeof(wblock->req_buf_size));
|
|
}
|
|
|
|
static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct wmi_ioctl_buffer __user *input =
|
|
(struct wmi_ioctl_buffer __user *) arg;
|
|
struct wmi_block *wblock = filp->private_data;
|
|
struct wmi_ioctl_buffer *buf = NULL;
|
|
struct wmi_driver *wdriver = NULL;
|
|
int ret;
|
|
|
|
if (_IOC_TYPE(cmd) != WMI_IOC)
|
|
return -ENOTTY;
|
|
|
|
/* make sure we're not calling a higher instance than exists*/
|
|
if (_IOC_NR(cmd) >= wblock->gblock.instance_count)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&wblock->char_mutex);
|
|
buf = wblock->handler_data;
|
|
if (get_user(buf->length, &input->length)) {
|
|
dev_dbg(&wblock->dev.dev, "Read length from user failed\n");
|
|
ret = -EFAULT;
|
|
goto out_ioctl;
|
|
}
|
|
/* if it's too small, abort */
|
|
if (buf->length < wblock->req_buf_size) {
|
|
dev_err(&wblock->dev.dev,
|
|
"Buffer %lld too small, need at least %lld\n",
|
|
buf->length, wblock->req_buf_size);
|
|
ret = -EINVAL;
|
|
goto out_ioctl;
|
|
}
|
|
/* if it's too big, warn, driver will only use what is needed */
|
|
if (buf->length > wblock->req_buf_size)
|
|
dev_warn(&wblock->dev.dev,
|
|
"Buffer %lld is bigger than required %lld\n",
|
|
buf->length, wblock->req_buf_size);
|
|
|
|
/* copy the structure from userspace */
|
|
if (copy_from_user(buf, input, wblock->req_buf_size)) {
|
|
dev_dbg(&wblock->dev.dev, "Copy %llu from user failed\n",
|
|
wblock->req_buf_size);
|
|
ret = -EFAULT;
|
|
goto out_ioctl;
|
|
}
|
|
|
|
/* let the driver do any filtering and do the call */
|
|
wdriver = container_of(wblock->dev.dev.driver,
|
|
struct wmi_driver, driver);
|
|
if (!try_module_get(wdriver->driver.owner)) {
|
|
ret = -EBUSY;
|
|
goto out_ioctl;
|
|
}
|
|
ret = wdriver->filter_callback(&wblock->dev, cmd, buf);
|
|
module_put(wdriver->driver.owner);
|
|
if (ret)
|
|
goto out_ioctl;
|
|
|
|
/* return the result (only up to our internal buffer size) */
|
|
if (copy_to_user(input, buf, wblock->req_buf_size)) {
|
|
dev_dbg(&wblock->dev.dev, "Copy %llu to user failed\n",
|
|
wblock->req_buf_size);
|
|
ret = -EFAULT;
|
|
}
|
|
|
|
out_ioctl:
|
|
mutex_unlock(&wblock->char_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations wmi_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = wmi_char_read,
|
|
.open = wmi_char_open,
|
|
.unlocked_ioctl = wmi_ioctl,
|
|
.compat_ioctl = wmi_ioctl,
|
|
};
|
|
|
|
static int wmi_dev_probe(struct device *dev)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
struct wmi_driver *wdriver =
|
|
container_of(dev->driver, struct wmi_driver, driver);
|
|
int ret = 0;
|
|
int count;
|
|
char *buf;
|
|
|
|
if (ACPI_FAILURE(wmi_method_enable(wblock, 1)))
|
|
dev_warn(dev, "failed to enable device -- probing anyway\n");
|
|
|
|
if (wdriver->probe) {
|
|
ret = wdriver->probe(dev_to_wdev(dev));
|
|
if (ret != 0)
|
|
goto probe_failure;
|
|
}
|
|
|
|
/* driver wants a character device made */
|
|
if (wdriver->filter_callback) {
|
|
/* check that required buffer size declared by driver or MOF */
|
|
if (!wblock->req_buf_size) {
|
|
dev_err(&wblock->dev.dev,
|
|
"Required buffer size not set\n");
|
|
ret = -EINVAL;
|
|
goto probe_failure;
|
|
}
|
|
|
|
count = get_order(wblock->req_buf_size);
|
|
wblock->handler_data = (void *)__get_free_pages(GFP_KERNEL,
|
|
count);
|
|
if (!wblock->handler_data) {
|
|
ret = -ENOMEM;
|
|
goto probe_failure;
|
|
}
|
|
|
|
buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name);
|
|
if (!buf) {
|
|
ret = -ENOMEM;
|
|
goto probe_string_failure;
|
|
}
|
|
wblock->char_dev.minor = MISC_DYNAMIC_MINOR;
|
|
wblock->char_dev.name = buf;
|
|
wblock->char_dev.fops = &wmi_fops;
|
|
wblock->char_dev.mode = 0444;
|
|
ret = misc_register(&wblock->char_dev);
|
|
if (ret) {
|
|
dev_warn(dev, "failed to register char dev: %d\n", ret);
|
|
ret = -ENOMEM;
|
|
goto probe_misc_failure;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
probe_misc_failure:
|
|
kfree(buf);
|
|
probe_string_failure:
|
|
kfree(wblock->handler_data);
|
|
probe_failure:
|
|
if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
|
|
dev_warn(dev, "failed to disable device\n");
|
|
return ret;
|
|
}
|
|
|
|
static int wmi_dev_remove(struct device *dev)
|
|
{
|
|
struct wmi_block *wblock = dev_to_wblock(dev);
|
|
struct wmi_driver *wdriver =
|
|
container_of(dev->driver, struct wmi_driver, driver);
|
|
int ret = 0;
|
|
|
|
if (wdriver->filter_callback) {
|
|
misc_deregister(&wblock->char_dev);
|
|
kfree(wblock->char_dev.name);
|
|
free_pages((unsigned long)wblock->handler_data,
|
|
get_order(wblock->req_buf_size));
|
|
}
|
|
|
|
if (wdriver->remove)
|
|
ret = wdriver->remove(dev_to_wdev(dev));
|
|
|
|
if (ACPI_FAILURE(wmi_method_enable(wblock, 0)))
|
|
dev_warn(dev, "failed to disable device\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct class wmi_bus_class = {
|
|
.name = "wmi_bus",
|
|
};
|
|
|
|
static struct bus_type wmi_bus_type = {
|
|
.name = "wmi",
|
|
.dev_groups = wmi_groups,
|
|
.match = wmi_dev_match,
|
|
.uevent = wmi_dev_uevent,
|
|
.probe = wmi_dev_probe,
|
|
.remove = wmi_dev_remove,
|
|
};
|
|
|
|
static struct device_type wmi_type_event = {
|
|
.name = "event",
|
|
.groups = wmi_event_groups,
|
|
.release = wmi_dev_release,
|
|
};
|
|
|
|
static struct device_type wmi_type_method = {
|
|
.name = "method",
|
|
.groups = wmi_method_groups,
|
|
.release = wmi_dev_release,
|
|
};
|
|
|
|
static struct device_type wmi_type_data = {
|
|
.name = "data",
|
|
.groups = wmi_data_groups,
|
|
.release = wmi_dev_release,
|
|
};
|
|
|
|
static int wmi_create_device(struct device *wmi_bus_dev,
|
|
const struct guid_block *gblock,
|
|
struct wmi_block *wblock,
|
|
struct acpi_device *device)
|
|
{
|
|
struct acpi_device_info *info;
|
|
char method[5];
|
|
int result;
|
|
|
|
if (gblock->flags & ACPI_WMI_EVENT) {
|
|
wblock->dev.dev.type = &wmi_type_event;
|
|
goto out_init;
|
|
}
|
|
|
|
if (gblock->flags & ACPI_WMI_METHOD) {
|
|
wblock->dev.dev.type = &wmi_type_method;
|
|
mutex_init(&wblock->char_mutex);
|
|
goto out_init;
|
|
}
|
|
|
|
/*
|
|
* Data Block Query Control Method (WQxx by convention) is
|
|
* required per the WMI documentation. If it is not present,
|
|
* we ignore this data block.
|
|
*/
|
|
strcpy(method, "WQ");
|
|
strncat(method, wblock->gblock.object_id, 2);
|
|
result = get_subobj_info(device->handle, method, &info);
|
|
|
|
if (result) {
|
|
dev_warn(wmi_bus_dev,
|
|
"%s data block query control method not found\n",
|
|
method);
|
|
return result;
|
|
}
|
|
|
|
wblock->dev.dev.type = &wmi_type_data;
|
|
|
|
/*
|
|
* The Microsoft documentation specifically states:
|
|
*
|
|
* Data blocks registered with only a single instance
|
|
* can ignore the parameter.
|
|
*
|
|
* ACPICA will get mad at us if we call the method with the wrong number
|
|
* of arguments, so check what our method expects. (On some Dell
|
|
* laptops, WQxx may not be a method at all.)
|
|
*/
|
|
if (info->type != ACPI_TYPE_METHOD || info->param_count == 0)
|
|
wblock->read_takes_no_args = true;
|
|
|
|
kfree(info);
|
|
|
|
strcpy(method, "WS");
|
|
strncat(method, wblock->gblock.object_id, 2);
|
|
result = get_subobj_info(device->handle, method, NULL);
|
|
|
|
if (result == 0)
|
|
wblock->dev.setable = true;
|
|
|
|
out_init:
|
|
wblock->dev.dev.bus = &wmi_bus_type;
|
|
wblock->dev.dev.parent = wmi_bus_dev;
|
|
|
|
dev_set_name(&wblock->dev.dev, "%pUL", gblock->guid);
|
|
|
|
device_initialize(&wblock->dev.dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void wmi_free_devices(struct acpi_device *device)
|
|
{
|
|
struct wmi_block *wblock, *next;
|
|
|
|
/* Delete devices for all the GUIDs */
|
|
list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
|
|
if (wblock->acpi_device == device) {
|
|
list_del(&wblock->list);
|
|
device_unregister(&wblock->dev.dev);
|
|
}
|
|
}
|
|
}
|
|
|
|
static bool guid_already_parsed(struct acpi_device *device,
|
|
const u8 *guid)
|
|
{
|
|
struct wmi_block *wblock;
|
|
|
|
list_for_each_entry(wblock, &wmi_block_list, list) {
|
|
if (memcmp(wblock->gblock.guid, guid, 16) == 0) {
|
|
/*
|
|
* Because we historically didn't track the relationship
|
|
* between GUIDs and ACPI nodes, we don't know whether
|
|
* we need to suppress GUIDs that are unique on a
|
|
* given node but duplicated across nodes.
|
|
*/
|
|
dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n",
|
|
guid, dev_name(&wblock->acpi_device->dev));
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Parse the _WDG method for the GUID data blocks
|
|
*/
|
|
static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device)
|
|
{
|
|
struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
const struct guid_block *gblock;
|
|
struct wmi_block *wblock, *next;
|
|
union acpi_object *obj;
|
|
acpi_status status;
|
|
int retval = 0;
|
|
u32 i, total;
|
|
|
|
status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENXIO;
|
|
|
|
obj = (union acpi_object *) out.pointer;
|
|
if (!obj)
|
|
return -ENXIO;
|
|
|
|
if (obj->type != ACPI_TYPE_BUFFER) {
|
|
retval = -ENXIO;
|
|
goto out_free_pointer;
|
|
}
|
|
|
|
gblock = (const struct guid_block *)obj->buffer.pointer;
|
|
total = obj->buffer.length / sizeof(struct guid_block);
|
|
|
|
for (i = 0; i < total; i++) {
|
|
if (debug_dump_wdg)
|
|
wmi_dump_wdg(&gblock[i]);
|
|
|
|
/*
|
|
* Some WMI devices, like those for nVidia hooks, have a
|
|
* duplicate GUID. It's not clear what we should do in this
|
|
* case yet, so for now, we'll just ignore the duplicate
|
|
* for device creation.
|
|
*/
|
|
if (guid_already_parsed(device, gblock[i].guid))
|
|
continue;
|
|
|
|
wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
|
|
if (!wblock) {
|
|
retval = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
wblock->acpi_device = device;
|
|
wblock->gblock = gblock[i];
|
|
|
|
retval = wmi_create_device(wmi_bus_dev, &gblock[i], wblock, device);
|
|
if (retval) {
|
|
kfree(wblock);
|
|
continue;
|
|
}
|
|
|
|
list_add_tail(&wblock->list, &wmi_block_list);
|
|
|
|
if (debug_event) {
|
|
wblock->handler = wmi_notify_debug;
|
|
wmi_method_enable(wblock, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now that all of the devices are created, add them to the
|
|
* device tree and probe subdrivers.
|
|
*/
|
|
list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
|
|
if (wblock->acpi_device != device)
|
|
continue;
|
|
|
|
retval = device_add(&wblock->dev.dev);
|
|
if (retval) {
|
|
dev_err(wmi_bus_dev, "failed to register %pUL\n",
|
|
wblock->gblock.guid);
|
|
if (debug_event)
|
|
wmi_method_enable(wblock, 0);
|
|
list_del(&wblock->list);
|
|
put_device(&wblock->dev.dev);
|
|
}
|
|
}
|
|
|
|
out_free_pointer:
|
|
kfree(out.pointer);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* WMI can have EmbeddedControl access regions. In which case, we just want to
|
|
* hand these off to the EC driver.
|
|
*/
|
|
static acpi_status
|
|
acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
|
|
u32 bits, u64 *value,
|
|
void *handler_context, void *region_context)
|
|
{
|
|
int result = 0, i = 0;
|
|
u8 temp = 0;
|
|
|
|
if ((address > 0xFF) || !value)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (function != ACPI_READ && function != ACPI_WRITE)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (bits != 8)
|
|
return AE_BAD_PARAMETER;
|
|
|
|
if (function == ACPI_READ) {
|
|
result = ec_read(address, &temp);
|
|
(*value) |= ((u64)temp) << i;
|
|
} else {
|
|
temp = 0xff & ((*value) >> i);
|
|
result = ec_write(address, temp);
|
|
}
|
|
|
|
switch (result) {
|
|
case -EINVAL:
|
|
return AE_BAD_PARAMETER;
|
|
break;
|
|
case -ENODEV:
|
|
return AE_NOT_FOUND;
|
|
break;
|
|
case -ETIME:
|
|
return AE_TIME;
|
|
break;
|
|
default:
|
|
return AE_OK;
|
|
}
|
|
}
|
|
|
|
static void acpi_wmi_notify_handler(acpi_handle handle, u32 event,
|
|
void *context)
|
|
{
|
|
struct guid_block *block;
|
|
struct wmi_block *wblock;
|
|
bool found_it = false;
|
|
|
|
list_for_each_entry(wblock, &wmi_block_list, list) {
|
|
block = &wblock->gblock;
|
|
|
|
if (wblock->acpi_device->handle == handle &&
|
|
(block->flags & ACPI_WMI_EVENT) &&
|
|
(block->notify_id == event))
|
|
{
|
|
found_it = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found_it)
|
|
return;
|
|
|
|
/* If a driver is bound, then notify the driver. */
|
|
if (wblock->dev.dev.driver) {
|
|
struct wmi_driver *driver;
|
|
struct acpi_object_list input;
|
|
union acpi_object params[1];
|
|
struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
acpi_status status;
|
|
|
|
driver = container_of(wblock->dev.dev.driver,
|
|
struct wmi_driver, driver);
|
|
|
|
input.count = 1;
|
|
input.pointer = params;
|
|
params[0].type = ACPI_TYPE_INTEGER;
|
|
params[0].integer.value = event;
|
|
|
|
status = acpi_evaluate_object(wblock->acpi_device->handle,
|
|
"_WED", &input, &evdata);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_warn(&wblock->dev.dev,
|
|
"failed to get event data\n");
|
|
return;
|
|
}
|
|
|
|
if (driver->notify)
|
|
driver->notify(&wblock->dev,
|
|
(union acpi_object *)evdata.pointer);
|
|
|
|
kfree(evdata.pointer);
|
|
} else if (wblock->handler) {
|
|
/* Legacy handler */
|
|
wblock->handler(event, wblock->handler_data);
|
|
}
|
|
|
|
if (debug_event) {
|
|
pr_info("DEBUG Event GUID: %pUL\n",
|
|
wblock->gblock.guid);
|
|
}
|
|
|
|
acpi_bus_generate_netlink_event(
|
|
wblock->acpi_device->pnp.device_class,
|
|
dev_name(&wblock->dev.dev),
|
|
event, 0);
|
|
|
|
}
|
|
|
|
static int acpi_wmi_remove(struct platform_device *device)
|
|
{
|
|
struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
|
|
|
|
acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_wmi_notify_handler);
|
|
acpi_remove_address_space_handler(acpi_device->handle,
|
|
ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
|
|
wmi_free_devices(acpi_device);
|
|
device_destroy(&wmi_bus_class, MKDEV(0, 0));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_wmi_probe(struct platform_device *device)
|
|
{
|
|
struct acpi_device *acpi_device;
|
|
struct device *wmi_bus_dev;
|
|
acpi_status status;
|
|
int error;
|
|
|
|
acpi_device = ACPI_COMPANION(&device->dev);
|
|
if (!acpi_device) {
|
|
dev_err(&device->dev, "ACPI companion is missing\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
status = acpi_install_address_space_handler(acpi_device->handle,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_wmi_ec_space_handler,
|
|
NULL, NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(&device->dev, "Error installing EC region handler\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
status = acpi_install_notify_handler(acpi_device->handle,
|
|
ACPI_DEVICE_NOTIFY,
|
|
acpi_wmi_notify_handler,
|
|
NULL);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(&device->dev, "Error installing notify handler\n");
|
|
error = -ENODEV;
|
|
goto err_remove_ec_handler;
|
|
}
|
|
|
|
wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0),
|
|
NULL, "wmi_bus-%s", dev_name(&device->dev));
|
|
if (IS_ERR(wmi_bus_dev)) {
|
|
error = PTR_ERR(wmi_bus_dev);
|
|
goto err_remove_notify_handler;
|
|
}
|
|
dev_set_drvdata(&device->dev, wmi_bus_dev);
|
|
|
|
error = parse_wdg(wmi_bus_dev, acpi_device);
|
|
if (error) {
|
|
pr_err("Failed to parse WDG method\n");
|
|
goto err_remove_busdev;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_remove_busdev:
|
|
device_destroy(&wmi_bus_class, MKDEV(0, 0));
|
|
|
|
err_remove_notify_handler:
|
|
acpi_remove_notify_handler(acpi_device->handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_wmi_notify_handler);
|
|
|
|
err_remove_ec_handler:
|
|
acpi_remove_address_space_handler(acpi_device->handle,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_wmi_ec_space_handler);
|
|
|
|
return error;
|
|
}
|
|
|
|
int __must_check __wmi_driver_register(struct wmi_driver *driver,
|
|
struct module *owner)
|
|
{
|
|
driver->driver.owner = owner;
|
|
driver->driver.bus = &wmi_bus_type;
|
|
|
|
return driver_register(&driver->driver);
|
|
}
|
|
EXPORT_SYMBOL(__wmi_driver_register);
|
|
|
|
void wmi_driver_unregister(struct wmi_driver *driver)
|
|
{
|
|
driver_unregister(&driver->driver);
|
|
}
|
|
EXPORT_SYMBOL(wmi_driver_unregister);
|
|
|
|
static int __init acpi_wmi_init(void)
|
|
{
|
|
int error;
|
|
|
|
if (acpi_disabled)
|
|
return -ENODEV;
|
|
|
|
error = class_register(&wmi_bus_class);
|
|
if (error)
|
|
return error;
|
|
|
|
error = bus_register(&wmi_bus_type);
|
|
if (error)
|
|
goto err_unreg_class;
|
|
|
|
error = platform_driver_register(&acpi_wmi_driver);
|
|
if (error) {
|
|
pr_err("Error loading mapper\n");
|
|
goto err_unreg_bus;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_unreg_bus:
|
|
bus_unregister(&wmi_bus_type);
|
|
|
|
err_unreg_class:
|
|
class_unregister(&wmi_bus_class);
|
|
|
|
return error;
|
|
}
|
|
|
|
static void __exit acpi_wmi_exit(void)
|
|
{
|
|
platform_driver_unregister(&acpi_wmi_driver);
|
|
bus_unregister(&wmi_bus_type);
|
|
class_unregister(&wmi_bus_class);
|
|
}
|
|
|
|
subsys_initcall_sync(acpi_wmi_init);
|
|
module_exit(acpi_wmi_exit);
|