diff options
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 986 |
1 files changed, 0 insertions, 986 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c deleted file mode 100644 index b13344c59808..000000000000 --- a/drivers/platform/x86/wmi.c +++ /dev/null @@ -1,986 +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. - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - */ - -#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> -#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" - -static DEFINE_MUTEX(wmi_data_lock); -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 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[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, 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[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) { - 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[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) - return -ENOMEM; - - wmi_gtoa(wblock->gblock.guid, guid_string); - - return sprintf(buf, "wmi:%s\n", guid_string); -} - -static struct device_attribute wmi_dev_attrs[] = { - __ATTR_RO(modalias), - __ATTR_NULL -}; - -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_attrs = wmi_dev_attrs, -}; - -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 acpi_status 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 AE_NO_MEMORY; - - 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); |