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747 lines
17 KiB
C
747 lines
17 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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.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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#define ACPI_WMI_CLASS "wmi"
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#undef PREFIX
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#define PREFIX "ACPI: WMI: "
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static DEFINE_MUTEX(wmi_data_lock);
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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 list_head list;
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struct guid_block gblock;
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acpi_handle handle;
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wmi_notify_handler handler;
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void *handler_data;
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};
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static struct wmi_block wmi_blocks;
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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 int acpi_wmi_remove(struct acpi_device *device, int type);
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static int acpi_wmi_add(struct acpi_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 acpi_driver acpi_wmi_driver = {
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.name = "wmi",
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.class = ACPI_WMI_CLASS,
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.ids = wmi_device_ids,
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.ops = {
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.add = acpi_wmi_add,
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.remove = acpi_wmi_remove,
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},
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};
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/*
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* GUID parsing functions
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*/
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/**
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* wmi_parse_hexbyte - Convert a ASCII hex number to a byte
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* @src: Pointer to at least 2 characters to convert.
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*
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* Convert a two character ASCII hex string to a number.
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*
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* Return: 0-255 Success, the byte was parsed correctly
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* -1 Error, an invalid character was supplied
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*/
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static int wmi_parse_hexbyte(const u8 *src)
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{
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unsigned int x; /* For correct wrapping */
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int h;
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/* high part */
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x = src[0];
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if (x - '0' <= '9' - '0') {
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h = x - '0';
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} else if (x - 'a' <= 'f' - 'a') {
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h = x - 'a' + 10;
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} else if (x - 'A' <= 'F' - 'A') {
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h = x - 'A' + 10;
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} else {
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return -1;
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}
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h <<= 4;
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/* low part */
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x = src[1];
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if (x - '0' <= '9' - '0')
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return h | (x - '0');
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if (x - 'a' <= 'f' - 'a')
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return h | (x - 'a' + 10);
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if (x - 'A' <= 'F' - 'A')
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return h | (x - 'A' + 10);
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return -1;
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}
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/**
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* wmi_swap_bytes - Rearrange GUID bytes to match GUID binary
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* @src: Memory block holding binary GUID (16 bytes)
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* @dest: Memory block to hold byte swapped binary GUID (16 bytes)
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*
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* Byte swap a binary GUID to match it's real GUID value
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*/
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static void wmi_swap_bytes(u8 *src, u8 *dest)
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{
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int i;
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for (i = 0; i <= 3; i++)
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memcpy(dest + i, src + (3 - i), 1);
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for (i = 0; i <= 1; i++)
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memcpy(dest + 4 + i, src + (5 - i), 1);
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for (i = 0; i <= 1; i++)
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memcpy(dest + 6 + i, src + (7 - i), 1);
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memcpy(dest + 8, src + 8, 8);
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}
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/**
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* wmi_parse_guid - Convert GUID from ASCII to binary
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* @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
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* @dest: Memory block to hold binary GUID (16 bytes)
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*
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* N.B. The GUID need not be NULL terminated.
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*
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* Return: 'true' @dest contains binary GUID
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* 'false' @dest contents are undefined
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*/
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static bool wmi_parse_guid(const u8 *src, u8 *dest)
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{
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static const int size[] = { 4, 2, 2, 2, 6 };
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int i, j, v;
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if (src[8] != '-' || src[13] != '-' ||
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src[18] != '-' || src[23] != '-')
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return false;
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for (j = 0; j < 5; j++, src++) {
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for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) {
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v = wmi_parse_hexbyte(src);
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if (v < 0)
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return false;
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}
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}
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return true;
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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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char tmp[16], guid_input[16];
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struct wmi_block *wblock;
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struct guid_block *block;
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struct list_head *p;
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wmi_parse_guid(guid_string, tmp);
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wmi_swap_bytes(tmp, guid_input);
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list_for_each(p, &wmi_blocks.list) {
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wblock = list_entry(p, struct wmi_block, 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 1;
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}
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}
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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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struct acpi_object_list input;
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union acpi_object params[1];
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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->handle;
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if (!block)
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return AE_NOT_EXIST;
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input.count = 1;
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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 = enable;
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snprintf(method, 5, "WE%02X", block->notify_id);
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status = acpi_evaluate_object(handle, method, &input, NULL);
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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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* 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 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[4] = "WM";
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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->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(wmi_evaluate_method);
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/**
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* wmi_query_block - Return contents of 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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* &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 guid_block *block = NULL;
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struct wmi_block *wblock = NULL;
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acpi_handle handle, wc_handle;
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acpi_status status, wc_status = AE_ERROR;
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struct acpi_object_list input, wc_input;
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union acpi_object wc_params[1], wq_params[1];
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char method[4];
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char wc_method[4] = "WC";
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if (!guid_string || !out)
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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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block = &wblock->gblock;
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handle = wblock->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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/*
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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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wc_input.count = 1;
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wc_input.pointer = wc_params;
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wc_params[0].type = ACPI_TYPE_INTEGER;
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wc_params[0].integer.value = 1;
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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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wc_status = acpi_get_handle(handle, wc_method, &wc_handle);
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if (ACPI_SUCCESS(wc_status))
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wc_status = acpi_evaluate_object(handle, wc_method,
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&wc_input, NULL);
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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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wc_params[0].integer.value = 0;
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status = acpi_evaluate_object(handle,
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wc_method, &wc_input, NULL);
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}
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return status;
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}
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EXPORT_SYMBOL_GPL(wmi_query_block);
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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[4] = "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->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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/**
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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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*
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* Register a handler for events sent to the ACPI-WMI mapper device.
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*/
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acpi_status wmi_install_notify_handler(const char *guid,
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wmi_notify_handler handler, void *data)
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{
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struct wmi_block *block;
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acpi_status status;
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if (!guid || !handler)
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return AE_BAD_PARAMETER;
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find_guid(guid, &block);
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if (!block)
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return AE_NOT_EXIST;
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if (block->handler)
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return AE_ALREADY_ACQUIRED;
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block->handler = handler;
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block->handler_data = data;
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status = wmi_method_enable(block, 1);
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return status;
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}
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EXPORT_SYMBOL_GPL(wmi_install_notify_handler);
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/**
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* wmi_uninstall_notify_handler - Unregister handler for WMI events
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*
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* Unregister handler for events sent to the ACPI-WMI mapper device.
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*/
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acpi_status wmi_remove_notify_handler(const char *guid)
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{
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struct wmi_block *block;
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acpi_status status;
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if (!guid)
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return AE_BAD_PARAMETER;
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find_guid(guid, &block);
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if (!block)
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return AE_NOT_EXIST;
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|
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if (!block->handler)
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return AE_NULL_ENTRY;
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status = wmi_method_enable(block, 0);
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block->handler = NULL;
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block->handler_data = NULL;
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return status;
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}
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EXPORT_SYMBOL_GPL(wmi_remove_notify_handler);
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|
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/**
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* wmi_get_event_data - Get WMI data associated with an event
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*
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* @event - Event to find
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* &out - Buffer to hold event data
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*
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* Returns extra data associated with an event in WMI.
|
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*/
|
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acpi_status wmi_get_event_data(u32 event, struct acpi_buffer *out)
|
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{
|
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struct acpi_object_list input;
|
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union acpi_object params[1];
|
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struct guid_block *gblock;
|
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struct wmi_block *wblock;
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struct list_head *p;
|
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|
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input.count = 1;
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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 = event;
|
|
|
|
list_for_each(p, &wmi_blocks.list) {
|
|
wblock = list_entry(p, struct wmi_block, list);
|
|
gblock = &wblock->gblock;
|
|
|
|
if ((gblock->flags & ACPI_WMI_EVENT) &&
|
|
(gblock->notify_id == event))
|
|
return acpi_evaluate_object(wblock->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);
|
|
|
|
/*
|
|
* Parse the _WDG method for the GUID data blocks
|
|
*/
|
|
static __init acpi_status parse_wdg(acpi_handle handle)
|
|
{
|
|
struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
union acpi_object *obj;
|
|
struct guid_block *gblock;
|
|
struct wmi_block *wblock;
|
|
acpi_status status;
|
|
u32 i, total;
|
|
|
|
status = acpi_evaluate_object(handle, "_WDG", NULL, &out);
|
|
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
obj = (union acpi_object *) out.pointer;
|
|
|
|
if (obj->type != ACPI_TYPE_BUFFER)
|
|
return AE_ERROR;
|
|
|
|
total = obj->buffer.length / sizeof(struct guid_block);
|
|
|
|
gblock = kzalloc(obj->buffer.length, GFP_KERNEL);
|
|
if (!gblock)
|
|
return AE_NO_MEMORY;
|
|
|
|
memcpy(gblock, obj->buffer.pointer, obj->buffer.length);
|
|
|
|
for (i = 0; i < total; i++) {
|
|
wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
|
|
if (!wblock)
|
|
return AE_NO_MEMORY;
|
|
|
|
wblock->gblock = gblock[i];
|
|
wblock->handle = handle;
|
|
list_add_tail(&wblock->list, &wmi_blocks.list);
|
|
}
|
|
|
|
kfree(out.pointer);
|
|
kfree(gblock);
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* 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, acpi_integer * 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) |= ((acpi_integer)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(acpi_handle handle, u32 event, void *data)
|
|
{
|
|
struct guid_block *block;
|
|
struct wmi_block *wblock;
|
|
struct list_head *p;
|
|
struct acpi_device *device = data;
|
|
|
|
list_for_each(p, &wmi_blocks.list) {
|
|
wblock = list_entry(p, struct wmi_block, list);
|
|
block = &wblock->gblock;
|
|
|
|
if ((block->flags & ACPI_WMI_EVENT) &&
|
|
(block->notify_id == event)) {
|
|
if (wblock->handler)
|
|
wblock->handler(event, wblock->handler_data);
|
|
|
|
acpi_bus_generate_netlink_event(
|
|
device->pnp.device_class, device->dev.bus_id,
|
|
event, 0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int acpi_wmi_remove(struct acpi_device *device, int type)
|
|
{
|
|
acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_wmi_notify);
|
|
|
|
acpi_remove_address_space_handler(device->handle,
|
|
ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init acpi_wmi_add(struct acpi_device *device)
|
|
{
|
|
acpi_status status;
|
|
int result = 0;
|
|
|
|
status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
|
|
acpi_wmi_notify, device);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "Error installing notify handler\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
status = acpi_install_address_space_handler(device->handle,
|
|
ACPI_ADR_SPACE_EC,
|
|
&acpi_wmi_ec_space_handler,
|
|
NULL, NULL);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
status = parse_wdg(device->handle);
|
|
if (ACPI_FAILURE(status)) {
|
|
printk(KERN_ERR PREFIX "Error installing EC region handler\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static int __init acpi_wmi_init(void)
|
|
{
|
|
acpi_status result;
|
|
|
|
INIT_LIST_HEAD(&wmi_blocks.list);
|
|
|
|
if (acpi_disabled)
|
|
return -ENODEV;
|
|
|
|
result = acpi_bus_register_driver(&acpi_wmi_driver);
|
|
|
|
if (result < 0) {
|
|
printk(KERN_INFO PREFIX "Error loading mapper\n");
|
|
} else {
|
|
printk(KERN_INFO PREFIX "Mapper loaded\n");
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
static void __exit acpi_wmi_exit(void)
|
|
{
|
|
struct list_head *p, *tmp;
|
|
struct wmi_block *wblock;
|
|
|
|
acpi_bus_unregister_driver(&acpi_wmi_driver);
|
|
|
|
list_for_each_safe(p, tmp, &wmi_blocks.list) {
|
|
wblock = list_entry(p, struct wmi_block, list);
|
|
|
|
list_del(p);
|
|
kfree(wblock);
|
|
}
|
|
|
|
printk(KERN_INFO PREFIX "Mapper unloaded\n");
|
|
}
|
|
|
|
subsys_initcall(acpi_wmi_init);
|
|
module_exit(acpi_wmi_exit);
|