diff options
Diffstat (limited to 'drivers/acpi/wmi.c')
| -rw-r--r-- | drivers/acpi/wmi.c | 747 |
1 files changed, 0 insertions, 747 deletions
diff --git a/drivers/acpi/wmi.c b/drivers/acpi/wmi.c deleted file mode 100644 index 47cd7baf9b1..00000000000 --- a/drivers/acpi/wmi.c +++ /dev/null @@ -1,747 +0,0 @@ -/* - * 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; -} - -static acpi_status wmi_method_enable(struct wmi_block *wblock, int enable) -{ - struct guid_block *block = NULL; - char method[5]; - struct acpi_object_list input; - union acpi_object params[1]; - acpi_status status; - acpi_handle handle; - - block = &wblock->gblock; - handle = wblock->handle; - - if (!block) - return AE_NOT_EXIST; - - input.count = 1; - input.pointer = params; - params[0].type = ACPI_TYPE_INTEGER; - params[0].integer.value = enable; - - snprintf(method, 5, "WE%02X", block->notify_id); - status = acpi_evaluate_object(handle, method, &input, NULL); - - 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[4] = "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, 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_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) { - 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_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); - -/** - * 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; - - 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; - - status = wmi_method_enable(block, 1); - - 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; - - if (!guid) - return AE_BAD_PARAMETER; - - find_guid(guid, &block); - if (!block) - return AE_NOT_EXIST; - - if (!block->handler) - return AE_NULL_ENTRY; - - status = wmi_method_enable(block, 0); - - block->handler = NULL; - block->handler_data = NULL; - - 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 - * - * 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); |