--- /dev/null
+/*
+ * ACPI-WMI mapping driver
+ *
+ * Copyright (C) 2007-2008 Carlos Corbacho <carlos@strangeworlds.co.uk>
+ *
+ * GUID parsing code from ldm.c is:
+ * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
+ * Copyright (c) 2001-2007 Anton Altaparmakov
+ * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/acpi.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+ACPI_MODULE_NAME("wmi");
+MODULE_AUTHOR("Carlos Corbacho");
+MODULE_DESCRIPTION("ACPI-WMI Mapping Driver");
+MODULE_LICENSE("GPL");
+
+#define ACPI_WMI_CLASS "wmi"
+
+static LIST_HEAD(wmi_block_list);
+
+struct guid_block {
+ char guid[16];
+ union {
+ char object_id[2];
+ struct {
+ unsigned char notify_id;
+ unsigned char reserved;
+ };
+ };
+ u8 instance_count;
+ u8 flags;
+};
+
+struct wmi_block {
+ struct list_head list;
+ struct guid_block gblock;
+ acpi_handle handle;
+ wmi_notify_handler handler;
+ void *handler_data;
+ struct device dev;
+};
+
+
+/*
+ * If the GUID data block is marked as expensive, we must enable and
+ * explicitily disable data collection.
+ */
+#define ACPI_WMI_EXPENSIVE 0x1
+#define ACPI_WMI_METHOD 0x2 /* GUID is a method */
+#define ACPI_WMI_STRING 0x4 /* GUID takes & returns a string */
+#define ACPI_WMI_EVENT 0x8 /* GUID is an event */
+
+static bool debug_event;
+module_param(debug_event, bool, 0444);
+MODULE_PARM_DESC(debug_event,
+ "Log WMI Events [0/1]");
+
+static bool debug_dump_wdg;
+module_param(debug_dump_wdg, bool, 0444);
+MODULE_PARM_DESC(debug_dump_wdg,
+ "Dump available WMI interfaces [0/1]");
+
+static int acpi_wmi_remove(struct acpi_device *device);
+static int acpi_wmi_add(struct acpi_device *device);
+static void acpi_wmi_notify(struct acpi_device *device, u32 event);
+
+static const struct acpi_device_id wmi_device_ids[] = {
+ {"PNP0C14", 0},
+ {"pnp0c14", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, wmi_device_ids);
+
+static struct acpi_driver acpi_wmi_driver = {
+ .name = "wmi",
+ .class = ACPI_WMI_CLASS,
+ .ids = wmi_device_ids,
+ .ops = {
+ .add = acpi_wmi_add,
+ .remove = acpi_wmi_remove,
+ .notify = acpi_wmi_notify,
+ },
+};
+
+/*
+ * GUID parsing functions
+ */
+
+/**
+ * wmi_parse_hexbyte - Convert a ASCII hex number to a byte
+ * @src: Pointer to at least 2 characters to convert.
+ *
+ * Convert a two character ASCII hex string to a number.
+ *
+ * Return: 0-255 Success, the byte was parsed correctly
+ * -1 Error, an invalid character was supplied
+ */
+static int wmi_parse_hexbyte(const u8 *src)
+{
+ int h;
+ int value;
+
+ /* high part */
+ h = value = hex_to_bin(src[0]);
+ if (value < 0)
+ return -1;
+
+ /* low part */
+ value = hex_to_bin(src[1]);
+ if (value >= 0)
+ return (h << 4) | value;
+ return -1;
+}
+
+/**
+ * wmi_swap_bytes - Rearrange GUID bytes to match GUID binary
+ * @src: Memory block holding binary GUID (16 bytes)
+ * @dest: Memory block to hold byte swapped binary GUID (16 bytes)
+ *
+ * Byte swap a binary GUID to match it's real GUID value
+ */
+static void wmi_swap_bytes(u8 *src, u8 *dest)
+{
+ int i;
+
+ for (i = 0; i <= 3; i++)
+ memcpy(dest + i, src + (3 - i), 1);
+
+ for (i = 0; i <= 1; i++)
+ memcpy(dest + 4 + i, src + (5 - i), 1);
+
+ for (i = 0; i <= 1; i++)
+ memcpy(dest + 6 + i, src + (7 - i), 1);
+
+ memcpy(dest + 8, src + 8, 8);
+}
+
+/**
+ * wmi_parse_guid - Convert GUID from ASCII to binary
+ * @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ * @dest: Memory block to hold binary GUID (16 bytes)
+ *
+ * N.B. The GUID need not be NULL terminated.
+ *
+ * Return: 'true' @dest contains binary GUID
+ * 'false' @dest contents are undefined
+ */
+static bool wmi_parse_guid(const u8 *src, u8 *dest)
+{
+ static const int size[] = { 4, 2, 2, 2, 6 };
+ int i, j, v;
+
+ if (src[8] != '-' || src[13] != '-' ||
+ src[18] != '-' || src[23] != '-')
+ return false;
+
+ for (j = 0; j < 5; j++, src++) {
+ for (i = 0; i < size[j]; i++, src += 2, *dest++ = v) {
+ v = wmi_parse_hexbyte(src);
+ if (v < 0)
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/*
+ * Convert a raw GUID to the ACII string representation
+ */
+static int wmi_gtoa(const char *in, char *out)
+{
+ int i;
+
+ for (i = 3; i >= 0; i--)
+ out += sprintf(out, "%02X", in[i] & 0xFF);
+
+ out += sprintf(out, "-");
+ out += sprintf(out, "%02X", in[5] & 0xFF);
+ out += sprintf(out, "%02X", in[4] & 0xFF);
+ out += sprintf(out, "-");
+ out += sprintf(out, "%02X", in[7] & 0xFF);
+ out += sprintf(out, "%02X", in[6] & 0xFF);
+ out += sprintf(out, "-");
+ out += sprintf(out, "%02X", in[8] & 0xFF);
+ out += sprintf(out, "%02X", in[9] & 0xFF);
+ out += sprintf(out, "-");
+
+ for (i = 10; i <= 15; i++)
+ out += sprintf(out, "%02X", in[i] & 0xFF);
+
+ *out = '\0';
+ return 0;
+}
+
+static bool find_guid(const char *guid_string, struct wmi_block **out)
+{
+ char tmp[16], guid_input[16];
+ struct wmi_block *wblock;
+ struct guid_block *block;
+ struct list_head *p;
+
+ wmi_parse_guid(guid_string, tmp);
+ wmi_swap_bytes(tmp, guid_input);
+
+ list_for_each(p, &wmi_block_list) {
+ wblock = list_entry(p, struct wmi_block, list);
+ block = &wblock->gblock;
+
+ if (memcmp(block->guid, guid_input, 16) == 0) {
+ if (out)
+ *out = wblock;
+ return true;
+ }
+ }
+ return false;
+}
+
+static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable)
+{
+ struct guid_block *block = NULL;
+ char method[5];
+ acpi_status status;
+ acpi_handle handle;
+
+ block = &wblock->gblock;
+ handle = wblock->handle;
+
+ snprintf(method, 5, "WE%02X", block->notify_id);
+ status = acpi_execute_simple_method(handle, method, enable);
+
+ if (status != AE_OK && status != AE_NOT_FOUND)
+ return status;
+ else
+ return AE_OK;
+}
+
+/*
+ * Exported WMI functions
+ */
+/**
+ * wmi_evaluate_method - Evaluate a WMI method
+ * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ * @instance: Instance index
+ * @method_id: Method ID to call
+ * &in: Buffer containing input for the method call
+ * &out: Empty buffer to return the method results
+ *
+ * Call an ACPI-WMI method
+ */
+acpi_status wmi_evaluate_method(const char *guid_string, u8 instance,
+u32 method_id, const struct acpi_buffer *in, struct acpi_buffer *out)
+{
+ struct guid_block *block = NULL;
+ struct wmi_block *wblock = NULL;
+ acpi_handle handle;
+ acpi_status status;
+ struct acpi_object_list input;
+ union acpi_object params[3];
+ char method[5] = "WM";
+
+ if (!find_guid(guid_string, &wblock))
+ return AE_ERROR;
+
+ block = &wblock->gblock;
+ handle = wblock->handle;
+
+ if (!(block->flags & ACPI_WMI_METHOD))
+ return AE_BAD_DATA;
+
+ if (block->instance_count < instance)
+ return AE_BAD_PARAMETER;
+
+ input.count = 2;
+ input.pointer = params;
+ params[0].type = ACPI_TYPE_INTEGER;
+ params[0].integer.value = instance;
+ params[1].type = ACPI_TYPE_INTEGER;
+ params[1].integer.value = method_id;
+
+ if (in) {
+ input.count = 3;
+
+ if (block->flags & ACPI_WMI_STRING) {
+ params[2].type = ACPI_TYPE_STRING;
+ } else {
+ params[2].type = ACPI_TYPE_BUFFER;
+ }
+ params[2].buffer.length = in->length;
+ params[2].buffer.pointer = in->pointer;
+ }
+
+ strncat(method, block->object_id, 2);
+
+ status = acpi_evaluate_object(handle, method, &input, out);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(wmi_evaluate_method);
+
+/**
+ * wmi_query_block - Return contents of a WMI block
+ * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ * @instance: Instance index
+ * &out: Empty buffer to return the contents of the data block to
+ *
+ * Return the contents of an ACPI-WMI data block to a buffer
+ */
+acpi_status wmi_query_block(const char *guid_string, u8 instance,
+struct acpi_buffer *out)
+{
+ struct guid_block *block = NULL;
+ struct wmi_block *wblock = NULL;
+ acpi_handle handle;
+ acpi_status status, wc_status = AE_ERROR;
+ struct acpi_object_list input;
+ union acpi_object wq_params[1];
+ char method[5];
+ char wc_method[5] = "WC";
+
+ if (!guid_string || !out)
+ return AE_BAD_PARAMETER;
+
+ if (!find_guid(guid_string, &wblock))
+ return AE_ERROR;
+
+ block = &wblock->gblock;
+ handle = wblock->handle;
+
+ if (block->instance_count < instance)
+ return AE_BAD_PARAMETER;
+
+ /* Check GUID is a data block */
+ if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
+ return AE_ERROR;
+
+ input.count = 1;
+ input.pointer = wq_params;
+ wq_params[0].type = ACPI_TYPE_INTEGER;
+ wq_params[0].integer.value = instance;
+
+ /*
+ * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to
+ * enable collection.
+ */
+ if (block->flags & ACPI_WMI_EXPENSIVE) {
+ strncat(wc_method, block->object_id, 2);
+
+ /*
+ * Some GUIDs break the specification by declaring themselves
+ * expensive, but have no corresponding WCxx method. So we
+ * should not fail if this happens.
+ */
+ if (acpi_has_method(handle, wc_method))
+ wc_status = acpi_execute_simple_method(handle,
+ wc_method, 1);
+ }
+
+ strcpy(method, "WQ");
+ strncat(method, block->object_id, 2);
+
+ status = acpi_evaluate_object(handle, method, &input, out);
+
+ /*
+ * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method, even if
+ * the WQxx method failed - we should disable collection anyway.
+ */
+ if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) {
+ status = acpi_execute_simple_method(handle, wc_method, 0);
+ }
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(wmi_query_block);
+
+/**
+ * wmi_set_block - Write to a WMI block
+ * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
+ * @instance: Instance index
+ * &in: Buffer containing new values for the data block
+ *
+ * Write the contents of the input buffer to an ACPI-WMI data block
+ */
+acpi_status wmi_set_block(const char *guid_string, u8 instance,
+const struct acpi_buffer *in)
+{
+ struct guid_block *block = NULL;
+ struct wmi_block *wblock = NULL;
+ acpi_handle handle;
+ struct acpi_object_list input;
+ union acpi_object params[2];
+ char method[5] = "WS";
+
+ if (!guid_string || !in)
+ return AE_BAD_DATA;
+
+ if (!find_guid(guid_string, &wblock))
+ return AE_ERROR;
+
+ block = &wblock->gblock;
+ handle = wblock->handle;
+
+ if (block->instance_count < instance)
+ return AE_BAD_PARAMETER;
+
+ /* Check GUID is a data block */
+ if (block->flags & (ACPI_WMI_EVENT | ACPI_WMI_METHOD))
+ return AE_ERROR;
+
+ input.count = 2;
+ input.pointer = params;
+ params[0].type = ACPI_TYPE_INTEGER;
+ params[0].integer.value = instance;
+
+ if (block->flags & ACPI_WMI_STRING) {
+ params[1].type = ACPI_TYPE_STRING;
+ } else {
+ params[1].type = ACPI_TYPE_BUFFER;
+ }
+ params[1].buffer.length = in->length;
+ params[1].buffer.pointer = in->pointer;
+
+ strncat(method, block->object_id, 2);
+
+ return acpi_evaluate_object(handle, method, &input, NULL);
+}
+EXPORT_SYMBOL_GPL(wmi_set_block);
+
+static void wmi_dump_wdg(const struct guid_block *g)
+{
+ char guid_string[37];
+
+ wmi_gtoa(g->guid, guid_string);
+
+ pr_info("%s:\n", guid_string);
+ pr_info("\tobject_id: %c%c\n", g->object_id[0], g->object_id[1]);
+ pr_info("\tnotify_id: %02X\n", g->notify_id);
+ pr_info("\treserved: %02X\n", g->reserved);
+ pr_info("\tinstance_count: %d\n", g->instance_count);
+ pr_info("\tflags: %#x", g->flags);
+ if (g->flags) {
+ if (g->flags & ACPI_WMI_EXPENSIVE)
+ pr_cont(" ACPI_WMI_EXPENSIVE");
+ if (g->flags & ACPI_WMI_METHOD)
+ pr_cont(" ACPI_WMI_METHOD");
+ if (g->flags & ACPI_WMI_STRING)
+ pr_cont(" ACPI_WMI_STRING");
+ if (g->flags & ACPI_WMI_EVENT)
+ pr_cont(" ACPI_WMI_EVENT");
+ }
+ pr_cont("\n");
+
+}
+
+static void wmi_notify_debug(u32 value, void *context)
+{
+ struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *obj;
+ acpi_status status;
+
+ status = wmi_get_event_data(value, &response);
+ if (status != AE_OK) {
+ pr_info("bad event status 0x%x\n", status);
+ return;
+ }
+
+ obj = (union acpi_object *)response.pointer;
+
+ if (!obj)
+ return;
+
+ pr_info("DEBUG Event ");
+ switch(obj->type) {
+ case ACPI_TYPE_BUFFER:
+ pr_cont("BUFFER_TYPE - length %d\n", obj->buffer.length);
+ break;
+ case ACPI_TYPE_STRING:
+ pr_cont("STRING_TYPE - %s\n", obj->string.pointer);
+ break;
+ case ACPI_TYPE_INTEGER:
+ pr_cont("INTEGER_TYPE - %llu\n", obj->integer.value);
+ break;
+ case ACPI_TYPE_PACKAGE:
+ pr_cont("PACKAGE_TYPE - %d elements\n", obj->package.count);
+ break;
+ default:
+ pr_cont("object type 0x%X\n", obj->type);
+ }
+ kfree(obj);
+}
+
+/**
+ * wmi_install_notify_handler - Register handler for WMI events
+ * @handler: Function to handle notifications
+ * @data: Data to be returned to handler when event is fired
+ *
+ * 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;
+ char tmp[16], guid_input[16];
+ struct list_head *p;
+
+ if (!guid || !handler)
+ return AE_BAD_PARAMETER;
+
+ wmi_parse_guid(guid, tmp);
+ wmi_swap_bytes(tmp, guid_input);
+
+ list_for_each(p, &wmi_block_list) {
+ acpi_status wmi_status;
+ block = list_entry(p, struct wmi_block, list);
+
+ 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;
+ char tmp[16], guid_input[16];
+ struct list_head *p;
+
+ if (!guid)
+ return AE_BAD_PARAMETER;
+
+ wmi_parse_guid(guid, tmp);
+ wmi_swap_bytes(tmp, guid_input);
+
+ list_for_each(p, &wmi_block_list) {
+ acpi_status wmi_status;
+ block = list_entry(p, struct wmi_block, list);
+
+ 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;
+ struct list_head *p;
+
+ input.count = 1;
+ input.pointer = params;
+ params[0].type = ACPI_TYPE_INTEGER;
+ params[0].integer.value = event;
+
+ list_for_each(p, &wmi_block_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);
+
+/*
+ * sysfs interface
+ */
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ char guid_string[37];
+ struct wmi_block *wblock;
+
+ wblock = dev_get_drvdata(dev);
+ if (!wblock) {
+ strcat(buf, "\n");
+ return strlen(buf);
+ }
+
+ wmi_gtoa(wblock->gblock.guid, guid_string);
+
+ return sprintf(buf, "wmi:%s\n", guid_string);
+}
+static DEVICE_ATTR_RO(modalias);
+
+static struct attribute *wmi_attrs[] = {
+ &dev_attr_modalias.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(wmi);
+
+static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ char guid_string[37];
+
+ struct wmi_block *wblock;
+
+ if (add_uevent_var(env, "MODALIAS="))
+ return -ENOMEM;
+
+ wblock = dev_get_drvdata(dev);
+ if (!wblock)
+ return -ENOMEM;
+
+ wmi_gtoa(wblock->gblock.guid, guid_string);
+
+ strcpy(&env->buf[env->buflen - 1], "wmi:");
+ memcpy(&env->buf[env->buflen - 1 + 4], guid_string, 36);
+ env->buflen += 40;
+
+ return 0;
+}
+
+static void wmi_dev_free(struct device *dev)
+{
+ struct wmi_block *wmi_block = container_of(dev, struct wmi_block, dev);
+
+ kfree(wmi_block);
+}
+
+static struct class wmi_class = {
+ .name = "wmi",
+ .dev_release = wmi_dev_free,
+ .dev_uevent = wmi_dev_uevent,
+ .dev_groups = wmi_groups,
+};
+
+static int wmi_create_device(const struct guid_block *gblock,
+ struct wmi_block *wblock, acpi_handle handle)
+{
+ char guid_string[37];
+
+ wblock->dev.class = &wmi_class;
+
+ wmi_gtoa(gblock->guid, guid_string);
+ dev_set_name(&wblock->dev, "%s", guid_string);
+
+ dev_set_drvdata(&wblock->dev, wblock);
+
+ return device_register(&wblock->dev);
+}
+
+static void wmi_free_devices(void)
+{
+ struct wmi_block *wblock, *next;
+
+ /* Delete devices for all the GUIDs */
+ list_for_each_entry_safe(wblock, next, &wmi_block_list, list) {
+ list_del(&wblock->list);
+ if (wblock->dev.class)
+ device_unregister(&wblock->dev);
+ else
+ kfree(wblock);
+ }
+}
+
+static bool guid_already_parsed(const char *guid_string)
+{
+ struct wmi_block *wblock;
+
+ list_for_each_entry(wblock, &wmi_block_list, list)
+ if (memcmp(wblock->gblock.guid, guid_string, 16) == 0)
+ return true;
+
+ return false;
+}
+
+/*
+ * Parse the _WDG method for the GUID data blocks
+ */
+static int parse_wdg(acpi_handle handle)
+{
+ struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL};
+ union acpi_object *obj;
+ const struct guid_block *gblock;
+ struct wmi_block *wblock;
+ acpi_status status;
+ int retval;
+ u32 i, total;
+
+ status = acpi_evaluate_object(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]);
+
+ wblock = kzalloc(sizeof(struct wmi_block), GFP_KERNEL);
+ if (!wblock)
+ return -ENOMEM;
+
+ wblock->handle = handle;
+ wblock->gblock = 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(gblock[i].guid)) {
+ retval = wmi_create_device(&gblock[i], wblock, handle);
+ if (retval) {
+ wmi_free_devices();
+ goto out_free_pointer;
+ }
+ }
+
+ list_add_tail(&wblock->list, &wmi_block_list);
+
+ if (debug_event) {
+ wblock->handler = wmi_notify_debug;
+ wmi_method_enable(wblock, 1);
+ }
+ }
+
+ retval = 0;
+
+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(struct acpi_device *device, u32 event)
+{
+ struct guid_block *block;
+ struct wmi_block *wblock;
+ struct list_head *p;
+ char guid_string[37];
+
+ list_for_each(p, &wmi_block_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);
+ if (debug_event) {
+ wmi_gtoa(wblock->gblock.guid, guid_string);
+ pr_info("DEBUG Event GUID: %s\n", guid_string);
+ }
+
+ acpi_bus_generate_netlink_event(
+ device->pnp.device_class, dev_name(&device->dev),
+ event, 0);
+ break;
+ }
+ }
+}
+
+static int acpi_wmi_remove(struct acpi_device *device)
+{
+ acpi_remove_address_space_handler(device->handle,
+ ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
+ wmi_free_devices();
+
+ return 0;
+}
+
+static int acpi_wmi_add(struct acpi_device *device)
+{
+ acpi_status status;
+ int error;
+
+ status = acpi_install_address_space_handler(device->handle,
+ ACPI_ADR_SPACE_EC,
+ &acpi_wmi_ec_space_handler,
+ NULL, NULL);
+ if (ACPI_FAILURE(status)) {
+ pr_err("Error installing EC region handler\n");
+ return -ENODEV;
+ }
+
+ error = parse_wdg(device->handle);
+ if (error) {
+ acpi_remove_address_space_handler(device->handle,
+ ACPI_ADR_SPACE_EC,
+ &acpi_wmi_ec_space_handler);
+ pr_err("Failed to parse WDG method\n");
+ return error;
+ }
+
+ return 0;
+}
+
+static int __init acpi_wmi_init(void)
+{
+ int error;
+
+ if (acpi_disabled)
+ return -ENODEV;
+
+ error = class_register(&wmi_class);
+ if (error)
+ return error;
+
+ error = acpi_bus_register_driver(&acpi_wmi_driver);
+ if (error) {
+ pr_err("Error loading mapper\n");
+ class_unregister(&wmi_class);
+ return error;
+ }
+
+ pr_info("Mapper loaded\n");
+ return 0;
+}
+
+static void __exit acpi_wmi_exit(void)
+{
+ acpi_bus_unregister_driver(&acpi_wmi_driver);
+ class_unregister(&wmi_class);
+
+ pr_info("Mapper unloaded\n");
+}
+
+subsys_initcall(acpi_wmi_init);
+module_exit(acpi_wmi_exit);
Code Review / kvmfornfv.git / blobdiff