/* * 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. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/types.h> #include <linux/list.h> #include <linux/acpi.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> ACPI_MODULE_NAME("wmi"); MODULE_AUTHOR("Carlos Corbacho"); MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); MODULE_LICENSE("GPL"); #define ACPI_WMI_CLASS "wmi" #undef PREFIX #define PREFIX "ACPI: WMI: " static DEFINE_MUTEX(wmi_data_lock); 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; }; static struct wmi_block wmi_blocks; /* * 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 int acpi_wmi_remove(struct acpi_device *device, int type); static int acpi_wmi_add(struct acpi_device *device); 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, }, }; /* * 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) { unsigned int x; /* For correct wrapping */ int h; /* high part */ x = src[0]; if (x - '0' <= '9' - '0') { h = x - '0'; } else if (x - 'a' <= 'f' - 'a') { h = x - 'a' + 10; } else if (x - 'A' <= 'F' - 'A') { h = x - 'A' + 10; } else { return -1; } h <<= 4; /* low part */ x = src[1]; if (x - '0' <= '9' - '0') return h | (x - '0'); if (x - 'a' <= 'f' - 'a') return h | (x - 'a' + 10); if (x - 'A' <= 'F' - 'A') return h | (x - 'A' + 10); 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; } 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_blocks.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 1; } } return 0; } /* * 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[4] = "WM"; if (!find_guid(guid_string, &wblock)) return AE_BAD_ADDRESS; 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, wc_handle; acpi_status status, wc_status = AE_ERROR; struct acpi_object_list input, wc_input; union acpi_object wc_params[1], wq_params[1]; char method[4]; char wc_method[4] = "WC"; if (!guid_string || !out) return AE_BAD_PARAMETER; if (!find_guid(guid_string, &wblock)) return AE_BAD_ADDRESS; 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_BAD_ADDRESS; 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) { wc_input.count = 1; wc_input.pointer = wc_params; wc_params[0].type = ACPI_TYPE_INTEGER; wc_params[0].integer.value = 1; 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. */ wc_status = acpi_get_handle(handle, wc_method, &wc_handle); if (ACPI_SUCCESS(wc_status)) wc_status = acpi_evaluate_object(handle, wc_method, &wc_input, NULL); } 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)) { wc_params[0].integer.value = 0; status = acpi_evaluate_object(handle, wc_method, &wc_input, NULL); } 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[4] = "WS"; if (!guid_string || !in) return AE_BAD_DATA; if (!find_guid(guid_string, &wblock)) return AE_BAD_ADDRESS; 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_BAD_ADDRESS; 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); /** * 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; if (!guid || !handler) return AE_BAD_PARAMETER; find_guid(guid, &block); if (!block) return AE_NOT_EXIST; if (block->handler) return AE_ALREADY_ACQUIRED; block->handler = handler; block->handler_data = data; return AE_OK; } 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; if (!guid) return AE_BAD_PARAMETER; find_guid(guid, &block); if (!block) return AE_NOT_EXIST; if (!block->handler) return AE_NULL_ENTRY; block->handler = NULL; block->handler_data = NULL; return AE_OK; } 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 * * 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_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);