diff options
Diffstat (limited to 'drivers/platform/x86/wmi.c')
| -rw-r--r-- | drivers/platform/x86/wmi.c | 1521 |
1 files changed, 0 insertions, 1521 deletions
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c deleted file mode 100644 index 5ffc00480aef..000000000000 --- a/drivers/platform/x86/wmi.c +++ /dev/null @@ -1,1521 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * 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> - * - * WMI bus infrastructure by Andrew Lutomirski and Darren Hart: - * Copyright (C) 2015 Andrew Lutomirski - * Copyright (C) 2017 VMware, Inc. All Rights Reserved. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/acpi.h> -#include <linux/bits.h> -#include <linux/build_bug.h> -#include <linux/device.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/miscdevice.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/types.h> -#include <linux/uaccess.h> -#include <linux/uuid.h> -#include <linux/wmi.h> -#include <linux/fs.h> -#include <uapi/linux/wmi.h> - -MODULE_AUTHOR("Carlos Corbacho"); -MODULE_DESCRIPTION("ACPI-WMI Mapping Driver"); -MODULE_LICENSE("GPL"); - -static LIST_HEAD(wmi_block_list); - -struct guid_block { - guid_t guid; - union { - char object_id[2]; - struct { - unsigned char notify_id; - unsigned char reserved; - }; - }; - u8 instance_count; - u8 flags; -} __packed; -static_assert(sizeof(typeof_member(struct guid_block, guid)) == 16); -static_assert(sizeof(struct guid_block) == 20); -static_assert(__alignof__(struct guid_block) == 1); - -enum { /* wmi_block flags */ - WMI_READ_TAKES_NO_ARGS, - WMI_PROBED, -}; - -struct wmi_block { - struct wmi_device dev; - struct list_head list; - struct guid_block gblock; - struct miscdevice char_dev; - struct mutex char_mutex; - struct acpi_device *acpi_device; - wmi_notify_handler handler; - void *handler_data; - u64 req_buf_size; - unsigned long flags; -}; - - -/* - * If the GUID data block is marked as expensive, we must enable and - * explicitily disable data collection. - */ -#define ACPI_WMI_EXPENSIVE BIT(0) -#define ACPI_WMI_METHOD BIT(1) /* GUID is a method */ -#define ACPI_WMI_STRING BIT(2) /* GUID takes & returns a string */ -#define ACPI_WMI_EVENT BIT(3) /* 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 const struct acpi_device_id wmi_device_ids[] = { - {"PNP0C14", 0}, - {"pnp0c14", 0}, - { } -}; -MODULE_DEVICE_TABLE(acpi, wmi_device_ids); - -/* allow duplicate GUIDs as these device drivers use struct wmi_driver */ -static const char * const allow_duplicates[] = { - "05901221-D566-11D1-B2F0-00A0C9062910", /* wmi-bmof */ - "8A42EA14-4F2A-FD45-6422-0087F7A7E608", /* dell-wmi-ddv */ - NULL -}; - -/* - * GUID parsing functions - */ - -static acpi_status find_guid(const char *guid_string, struct wmi_block **out) -{ - guid_t guid_input; - struct wmi_block *wblock; - - if (!guid_string) - return AE_BAD_PARAMETER; - - if (guid_parse(guid_string, &guid_input)) - return AE_BAD_PARAMETER; - - list_for_each_entry(wblock, &wmi_block_list, list) { - if (guid_equal(&wblock->gblock.guid, &guid_input)) { - if (out) - *out = wblock; - - return AE_OK; - } - } - - return AE_NOT_FOUND; -} - -static const void *find_guid_context(struct wmi_block *wblock, - struct wmi_driver *wdriver) -{ - const struct wmi_device_id *id; - - id = wdriver->id_table; - if (!id) - return NULL; - - while (*id->guid_string) { - guid_t guid_input; - - if (guid_parse(id->guid_string, &guid_input)) - continue; - if (guid_equal(&wblock->gblock.guid, &guid_input)) - return id->context; - id++; - } - return NULL; -} - -static int get_subobj_info(acpi_handle handle, const char *pathname, - struct acpi_device_info **info) -{ - struct acpi_device_info *dummy_info, **info_ptr; - acpi_handle subobj_handle; - acpi_status status; - - status = acpi_get_handle(handle, (char *)pathname, &subobj_handle); - if (status == AE_NOT_FOUND) - return -ENOENT; - else if (ACPI_FAILURE(status)) - return -EIO; - - info_ptr = info ? info : &dummy_info; - status = acpi_get_object_info(subobj_handle, info_ptr); - if (ACPI_FAILURE(status)) - return -EIO; - - if (!info) - kfree(dummy_info); - - return 0; -} - -static acpi_status wmi_method_enable(struct wmi_block *wblock, bool enable) -{ - struct guid_block *block; - char method[5]; - acpi_status status; - acpi_handle handle; - - block = &wblock->gblock; - handle = wblock->acpi_device->handle; - - snprintf(method, 5, "WE%02X", block->notify_id); - status = acpi_execute_simple_method(handle, method, enable); - if (status == AE_NOT_FOUND) - return AE_OK; - - return status; -} - -#define WMI_ACPI_METHOD_NAME_SIZE 5 - -static inline void get_acpi_method_name(const struct wmi_block *wblock, - const char method, - char buffer[static WMI_ACPI_METHOD_NAME_SIZE]) -{ - static_assert(ARRAY_SIZE(wblock->gblock.object_id) == 2); - static_assert(WMI_ACPI_METHOD_NAME_SIZE >= 5); - - buffer[0] = 'W'; - buffer[1] = method; - buffer[2] = wblock->gblock.object_id[0]; - buffer[3] = wblock->gblock.object_id[1]; - buffer[4] = '\0'; -} - -static inline acpi_object_type get_param_acpi_type(const struct wmi_block *wblock) -{ - if (wblock->gblock.flags & ACPI_WMI_STRING) - return ACPI_TYPE_STRING; - else - return ACPI_TYPE_BUFFER; -} - -static acpi_status get_event_data(const struct wmi_block *wblock, struct acpi_buffer *out) -{ - union acpi_object param = { - .integer = { - .type = ACPI_TYPE_INTEGER, - .value = wblock->gblock.notify_id, - } - }; - struct acpi_object_list input = { - .count = 1, - .pointer = ¶m, - }; - - return acpi_evaluate_object(wblock->acpi_device->handle, "_WED", &input, out); -} - -/* - * Exported WMI functions - */ - -/** - * set_required_buffer_size - Sets the buffer size needed for performing IOCTL - * @wdev: A wmi bus device from a driver - * @length: Required buffer size - * - * Allocates memory needed for buffer, stores the buffer size in that memory - */ -int set_required_buffer_size(struct wmi_device *wdev, u64 length) -{ - struct wmi_block *wblock; - - wblock = container_of(wdev, struct wmi_block, dev); - wblock->req_buf_size = length; - - return 0; -} -EXPORT_SYMBOL_GPL(set_required_buffer_size); - -/** - * 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 wmi_block *wblock = NULL; - acpi_status status; - - status = find_guid(guid_string, &wblock); - if (ACPI_FAILURE(status)) - return status; - - return wmidev_evaluate_method(&wblock->dev, instance, method_id, - in, out); -} -EXPORT_SYMBOL_GPL(wmi_evaluate_method); - -/** - * wmidev_evaluate_method - Evaluate a WMI method - * @wdev: A wmi bus device from a driver - * @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 wmidev_evaluate_method(struct wmi_device *wdev, u8 instance, u32 method_id, - const struct acpi_buffer *in, struct acpi_buffer *out) -{ - struct guid_block *block; - struct wmi_block *wblock; - acpi_handle handle; - struct acpi_object_list input; - union acpi_object params[3]; - char method[WMI_ACPI_METHOD_NAME_SIZE]; - - wblock = container_of(wdev, struct wmi_block, dev); - block = &wblock->gblock; - handle = wblock->acpi_device->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; - - params[2].type = get_param_acpi_type(wblock); - params[2].buffer.length = in->length; - params[2].buffer.pointer = in->pointer; - } - - get_acpi_method_name(wblock, 'M', method); - - return acpi_evaluate_object(handle, method, &input, out); -} -EXPORT_SYMBOL_GPL(wmidev_evaluate_method); - -static acpi_status __query_block(struct wmi_block *wblock, u8 instance, - struct acpi_buffer *out) -{ - struct guid_block *block; - acpi_handle handle; - acpi_status status, wc_status = AE_ERROR; - struct acpi_object_list input; - union acpi_object wq_params[1]; - char wc_method[WMI_ACPI_METHOD_NAME_SIZE]; - char method[WMI_ACPI_METHOD_NAME_SIZE]; - - if (!out) - return AE_BAD_PARAMETER; - - block = &wblock->gblock; - handle = wblock->acpi_device->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 (instance == 0 && test_bit(WMI_READ_TAKES_NO_ARGS, &wblock->flags)) - input.count = 0; - - /* - * If ACPI_WMI_EXPENSIVE, call the relevant WCxx method first to - * enable collection. - */ - if (block->flags & ACPI_WMI_EXPENSIVE) { - get_acpi_method_name(wblock, 'C', wc_method); - - /* - * 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_execute_simple_method(handle, wc_method, 1); - } - - get_acpi_method_name(wblock, 'Q', method); - 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)) { - /* - * Ignore whether this WCxx call succeeds or not since - * the previously executed WQxx method call might have - * succeeded, and returning the failing status code - * of this call would throw away the result of the WQxx - * call, potentially leaking memory. - */ - acpi_execute_simple_method(handle, wc_method, 0); - } - - return status; -} - -/** - * wmi_query_block - Return contents of a WMI block (deprecated) - * @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 wmi_block *wblock; - acpi_status status; - - status = find_guid(guid_string, &wblock); - if (ACPI_FAILURE(status)) - return status; - - return __query_block(wblock, instance, out); -} -EXPORT_SYMBOL_GPL(wmi_query_block); - -union acpi_object *wmidev_block_query(struct wmi_device *wdev, u8 instance) -{ - struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; - struct wmi_block *wblock = container_of(wdev, struct wmi_block, dev); - - if (ACPI_FAILURE(__query_block(wblock, instance, &out))) - return NULL; - - return out.pointer; -} -EXPORT_SYMBOL_GPL(wmidev_block_query); - -/** - * 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 wmi_block *wblock = NULL; - struct guid_block *block; - acpi_handle handle; - struct acpi_object_list input; - union acpi_object params[2]; - char method[WMI_ACPI_METHOD_NAME_SIZE]; - acpi_status status; - - if (!in) - return AE_BAD_DATA; - - status = find_guid(guid_string, &wblock); - if (ACPI_FAILURE(status)) - return status; - - block = &wblock->gblock; - handle = wblock->acpi_device->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; - params[1].type = get_param_acpi_type(wblock); - params[1].buffer.length = in->length; - params[1].buffer.pointer = in->pointer; - - get_acpi_method_name(wblock, 'S', method); - - return acpi_evaluate_object(handle, method, &input, NULL); -} -EXPORT_SYMBOL_GPL(wmi_set_block); - -static void wmi_dump_wdg(const struct guid_block *g) -{ - pr_info("%pUL:\n", &g->guid); - if (g->flags & ACPI_WMI_EVENT) - pr_info("\tnotify_id: 0x%02X\n", g->notify_id); - else - pr_info("\tobject_id: %2pE\n", g->object_id); - 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 = response.pointer; - if (!obj) - return; - - pr_info("DEBUG: event 0x%02X ", value); - switch (obj->type) { - case ACPI_TYPE_BUFFER: - pr_cont("BUFFER_TYPE - length %u\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 - %u 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 - * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba - * @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; - guid_t guid_input; - - if (!guid || !handler) - return AE_BAD_PARAMETER; - - if (guid_parse(guid, &guid_input)) - return AE_BAD_PARAMETER; - - list_for_each_entry(block, &wmi_block_list, list) { - acpi_status wmi_status; - - if (guid_equal(&block->gblock.guid, &guid_input)) { - 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, true); - 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_remove_notify_handler - Unregister handler for WMI events - * @guid: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba - * - * 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; - guid_t guid_input; - - if (!guid) - return AE_BAD_PARAMETER; - - if (guid_parse(guid, &guid_input)) - return AE_BAD_PARAMETER; - - list_for_each_entry(block, &wmi_block_list, list) { - acpi_status wmi_status; - - if (guid_equal(&block->gblock.guid, &guid_input)) { - 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, false); - 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 wmi_block *wblock; - - list_for_each_entry(wblock, &wmi_block_list, list) { - struct guid_block *gblock = &wblock->gblock; - - if ((gblock->flags & ACPI_WMI_EVENT) && gblock->notify_id == event) - return get_event_data(wblock, 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 ACPI_SUCCESS(find_guid(guid_string, NULL)); -} -EXPORT_SYMBOL_GPL(wmi_has_guid); - -/** - * wmi_get_acpi_device_uid() - Get _UID name of ACPI device that defines GUID - * @guid_string: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba - * - * Find the _UID of ACPI device associated with this WMI GUID. - * - * Return: The ACPI _UID field value or NULL if the WMI GUID was not found - */ -char *wmi_get_acpi_device_uid(const char *guid_string) -{ - struct wmi_block *wblock = NULL; - acpi_status status; - - status = find_guid(guid_string, &wblock); - if (ACPI_FAILURE(status)) - return NULL; - - return acpi_device_uid(wblock->acpi_device); -} -EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid); - -static struct wmi_block *dev_to_wblock(struct device *dev) -{ - return container_of(dev, struct wmi_block, dev.dev); -} - -static struct wmi_device *dev_to_wdev(struct device *dev) -{ - return container_of(dev, struct wmi_device, dev); -} - -static inline struct wmi_driver *drv_to_wdrv(struct device_driver *drv) -{ - return container_of(drv, struct wmi_driver, driver); -} - -/* - * sysfs interface - */ -static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - return sysfs_emit(buf, "wmi:%pUL\n", &wblock->gblock.guid); -} -static DEVICE_ATTR_RO(modalias); - -static ssize_t guid_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - return sysfs_emit(buf, "%pUL\n", &wblock->gblock.guid); -} -static DEVICE_ATTR_RO(guid); - -static ssize_t instance_count_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - return sysfs_emit(buf, "%d\n", (int)wblock->gblock.instance_count); -} -static DEVICE_ATTR_RO(instance_count); - -static ssize_t expensive_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - return sysfs_emit(buf, "%d\n", - (wblock->gblock.flags & ACPI_WMI_EXPENSIVE) != 0); -} -static DEVICE_ATTR_RO(expensive); - -static struct attribute *wmi_attrs[] = { - &dev_attr_modalias.attr, - &dev_attr_guid.attr, - &dev_attr_instance_count.attr, - &dev_attr_expensive.attr, - NULL -}; -ATTRIBUTE_GROUPS(wmi); - -static ssize_t notify_id_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - return sysfs_emit(buf, "%02X\n", (unsigned int)wblock->gblock.notify_id); -} -static DEVICE_ATTR_RO(notify_id); - -static struct attribute *wmi_event_attrs[] = { - &dev_attr_notify_id.attr, - NULL -}; -ATTRIBUTE_GROUPS(wmi_event); - -static ssize_t object_id_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - return sysfs_emit(buf, "%c%c\n", wblock->gblock.object_id[0], - wblock->gblock.object_id[1]); -} -static DEVICE_ATTR_RO(object_id); - -static ssize_t setable_show(struct device *dev, struct device_attribute *attr, - char *buf) -{ - struct wmi_device *wdev = dev_to_wdev(dev); - - return sysfs_emit(buf, "%d\n", (int)wdev->setable); -} -static DEVICE_ATTR_RO(setable); - -static struct attribute *wmi_data_attrs[] = { - &dev_attr_object_id.attr, - &dev_attr_setable.attr, - NULL -}; -ATTRIBUTE_GROUPS(wmi_data); - -static struct attribute *wmi_method_attrs[] = { - &dev_attr_object_id.attr, - NULL -}; -ATTRIBUTE_GROUPS(wmi_method); - -static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - if (add_uevent_var(env, "MODALIAS=wmi:%pUL", &wblock->gblock.guid)) - return -ENOMEM; - - if (add_uevent_var(env, "WMI_GUID=%pUL", &wblock->gblock.guid)) - return -ENOMEM; - - return 0; -} - -static void wmi_dev_release(struct device *dev) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - - kfree(wblock); -} - -static int wmi_dev_match(struct device *dev, struct device_driver *driver) -{ - struct wmi_driver *wmi_driver = drv_to_wdrv(driver); - struct wmi_block *wblock = dev_to_wblock(dev); - const struct wmi_device_id *id = wmi_driver->id_table; - - if (id == NULL) - return 0; - - while (*id->guid_string) { - guid_t driver_guid; - - if (WARN_ON(guid_parse(id->guid_string, &driver_guid))) - continue; - if (guid_equal(&driver_guid, &wblock->gblock.guid)) - return 1; - - id++; - } - - return 0; -} -static int wmi_char_open(struct inode *inode, struct file *filp) -{ - const char *driver_name = filp->f_path.dentry->d_iname; - struct wmi_block *wblock; - struct wmi_block *next; - - list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { - if (!wblock->dev.dev.driver) - continue; - if (strcmp(driver_name, wblock->dev.dev.driver->name) == 0) { - filp->private_data = wblock; - break; - } - } - - if (!filp->private_data) - return -ENODEV; - - return nonseekable_open(inode, filp); -} - -static ssize_t wmi_char_read(struct file *filp, char __user *buffer, - size_t length, loff_t *offset) -{ - struct wmi_block *wblock = filp->private_data; - - return simple_read_from_buffer(buffer, length, offset, - &wblock->req_buf_size, - sizeof(wblock->req_buf_size)); -} - -static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) -{ - struct wmi_ioctl_buffer __user *input = - (struct wmi_ioctl_buffer __user *) arg; - struct wmi_block *wblock = filp->private_data; - struct wmi_ioctl_buffer *buf; - struct wmi_driver *wdriver; - int ret; - - if (_IOC_TYPE(cmd) != WMI_IOC) - return -ENOTTY; - - /* make sure we're not calling a higher instance than exists*/ - if (_IOC_NR(cmd) >= wblock->gblock.instance_count) - return -EINVAL; - - mutex_lock(&wblock->char_mutex); - buf = wblock->handler_data; - if (get_user(buf->length, &input->length)) { - dev_dbg(&wblock->dev.dev, "Read length from user failed\n"); - ret = -EFAULT; - goto out_ioctl; - } - /* if it's too small, abort */ - if (buf->length < wblock->req_buf_size) { - dev_err(&wblock->dev.dev, - "Buffer %lld too small, need at least %lld\n", - buf->length, wblock->req_buf_size); - ret = -EINVAL; - goto out_ioctl; - } - /* if it's too big, warn, driver will only use what is needed */ - if (buf->length > wblock->req_buf_size) - dev_warn(&wblock->dev.dev, - "Buffer %lld is bigger than required %lld\n", - buf->length, wblock->req_buf_size); - - /* copy the structure from userspace */ - if (copy_from_user(buf, input, wblock->req_buf_size)) { - dev_dbg(&wblock->dev.dev, "Copy %llu from user failed\n", - wblock->req_buf_size); - ret = -EFAULT; - goto out_ioctl; - } - - /* let the driver do any filtering and do the call */ - wdriver = drv_to_wdrv(wblock->dev.dev.driver); - if (!try_module_get(wdriver->driver.owner)) { - ret = -EBUSY; - goto out_ioctl; - } - ret = wdriver->filter_callback(&wblock->dev, cmd, buf); - module_put(wdriver->driver.owner); - if (ret) - goto out_ioctl; - - /* return the result (only up to our internal buffer size) */ - if (copy_to_user(input, buf, wblock->req_buf_size)) { - dev_dbg(&wblock->dev.dev, "Copy %llu to user failed\n", - wblock->req_buf_size); - ret = -EFAULT; - } - -out_ioctl: - mutex_unlock(&wblock->char_mutex); - return ret; -} - -static const struct file_operations wmi_fops = { - .owner = THIS_MODULE, - .read = wmi_char_read, - .open = wmi_char_open, - .unlocked_ioctl = wmi_ioctl, - .compat_ioctl = compat_ptr_ioctl, -}; - -static int wmi_dev_probe(struct device *dev) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - struct wmi_driver *wdriver = drv_to_wdrv(dev->driver); - int ret = 0; - char *buf; - - if (ACPI_FAILURE(wmi_method_enable(wblock, true))) - dev_warn(dev, "failed to enable device -- probing anyway\n"); - - if (wdriver->probe) { - ret = wdriver->probe(dev_to_wdev(dev), - find_guid_context(wblock, wdriver)); - if (ret != 0) - goto probe_failure; - } - - /* driver wants a character device made */ - if (wdriver->filter_callback) { - /* check that required buffer size declared by driver or MOF */ - if (!wblock->req_buf_size) { - dev_err(&wblock->dev.dev, - "Required buffer size not set\n"); - ret = -EINVAL; - goto probe_failure; - } - - wblock->handler_data = kmalloc(wblock->req_buf_size, - GFP_KERNEL); - if (!wblock->handler_data) { - ret = -ENOMEM; - goto probe_failure; - } - - buf = kasprintf(GFP_KERNEL, "wmi/%s", wdriver->driver.name); - if (!buf) { - ret = -ENOMEM; - goto probe_string_failure; - } - wblock->char_dev.minor = MISC_DYNAMIC_MINOR; - wblock->char_dev.name = buf; - wblock->char_dev.fops = &wmi_fops; - wblock->char_dev.mode = 0444; - ret = misc_register(&wblock->char_dev); - if (ret) { - dev_warn(dev, "failed to register char dev: %d\n", ret); - ret = -ENOMEM; - goto probe_misc_failure; - } - } - - set_bit(WMI_PROBED, &wblock->flags); - return 0; - -probe_misc_failure: - kfree(buf); -probe_string_failure: - kfree(wblock->handler_data); -probe_failure: - if (ACPI_FAILURE(wmi_method_enable(wblock, false))) - dev_warn(dev, "failed to disable device\n"); - return ret; -} - -static void wmi_dev_remove(struct device *dev) -{ - struct wmi_block *wblock = dev_to_wblock(dev); - struct wmi_driver *wdriver = drv_to_wdrv(dev->driver); - - clear_bit(WMI_PROBED, &wblock->flags); - - if (wdriver->filter_callback) { - misc_deregister(&wblock->char_dev); - kfree(wblock->char_dev.name); - kfree(wblock->handler_data); - } - - if (wdriver->remove) - wdriver->remove(dev_to_wdev(dev)); - - if (ACPI_FAILURE(wmi_method_enable(wblock, false))) - dev_warn(dev, "failed to disable device\n"); -} - -static struct class wmi_bus_class = { - .name = "wmi_bus", -}; - -static struct bus_type wmi_bus_type = { - .name = "wmi", - .dev_groups = wmi_groups, - .match = wmi_dev_match, - .uevent = wmi_dev_uevent, - .probe = wmi_dev_probe, - .remove = wmi_dev_remove, -}; - -static const struct device_type wmi_type_event = { - .name = "event", - .groups = wmi_event_groups, - .release = wmi_dev_release, -}; - -static const struct device_type wmi_type_method = { - .name = "method", - .groups = wmi_method_groups, - .release = wmi_dev_release, -}; - -static const struct device_type wmi_type_data = { - .name = "data", - .groups = wmi_data_groups, - .release = wmi_dev_release, -}; - -/* - * _WDG is a static list that is only parsed at startup, - * so it's safe to count entries without extra protection. - */ -static int guid_count(const guid_t *guid) -{ - struct wmi_block *wblock; - int count = 0; - - list_for_each_entry(wblock, &wmi_block_list, list) { - if (guid_equal(&wblock->gblock.guid, guid)) - count++; - } - - return count; -} - -static int wmi_create_device(struct device *wmi_bus_dev, - struct wmi_block *wblock, - struct acpi_device *device) -{ - struct acpi_device_info *info; - char method[WMI_ACPI_METHOD_NAME_SIZE]; - int result; - uint count; - - if (wblock->gblock.flags & ACPI_WMI_EVENT) { - wblock->dev.dev.type = &wmi_type_event; - goto out_init; - } - - if (wblock->gblock.flags & ACPI_WMI_METHOD) { - wblock->dev.dev.type = &wmi_type_method; - mutex_init(&wblock->char_mutex); - goto out_init; - } - - /* - * Data Block Query Control Method (WQxx by convention) is - * required per the WMI documentation. If it is not present, - * we ignore this data block. - */ - get_acpi_method_name(wblock, 'Q', method); - result = get_subobj_info(device->handle, method, &info); - - if (result) { - dev_warn(wmi_bus_dev, - "%s data block query control method not found\n", - method); - return result; - } - - wblock->dev.dev.type = &wmi_type_data; - - /* - * The Microsoft documentation specifically states: - * - * Data blocks registered with only a single instance - * can ignore the parameter. - * - * ACPICA will get mad at us if we call the method with the wrong number - * of arguments, so check what our method expects. (On some Dell - * laptops, WQxx may not be a method at all.) - */ - if (info->type != ACPI_TYPE_METHOD || info->param_count == 0) - set_bit(WMI_READ_TAKES_NO_ARGS, &wblock->flags); - - kfree(info); - - get_acpi_method_name(wblock, 'S', method); - result = get_subobj_info(device->handle, method, NULL); - - if (result == 0) - wblock->dev.setable = true; - - out_init: - wblock->dev.dev.bus = &wmi_bus_type; - wblock->dev.dev.parent = wmi_bus_dev; - - count = guid_count(&wblock->gblock.guid); - if (count) - dev_set_name(&wblock->dev.dev, "%pUL-%d", &wblock->gblock.guid, count); - else - dev_set_name(&wblock->dev.dev, "%pUL", &wblock->gblock.guid); - - device_initialize(&wblock->dev.dev); - - return 0; -} - -static void wmi_free_devices(struct acpi_device *device) -{ - struct wmi_block *wblock, *next; - - /* Delete devices for all the GUIDs */ - list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { - if (wblock->acpi_device == device) { - list_del(&wblock->list); - device_unregister(&wblock->dev.dev); - } - } -} - -static bool guid_already_parsed_for_legacy(struct acpi_device *device, const guid_t *guid) -{ - struct wmi_block *wblock; - - list_for_each_entry(wblock, &wmi_block_list, list) { - /* skip warning and register if we know the driver will use struct wmi_driver */ - for (int i = 0; allow_duplicates[i] != NULL; i++) { - guid_t tmp; - - if (guid_parse(allow_duplicates[i], &tmp)) - continue; - if (guid_equal(&tmp, guid)) - return false; - } - if (guid_equal(&wblock->gblock.guid, guid)) { - /* - * Because we historically didn't track the relationship - * between GUIDs and ACPI nodes, we don't know whether - * we need to suppress GUIDs that are unique on a - * given node but duplicated across nodes. - */ - dev_warn(&device->dev, "duplicate WMI GUID %pUL (first instance was on %s)\n", - guid, dev_name(&wblock->acpi_device->dev)); - return true; - } - } - - return false; -} - -/* - * Parse the _WDG method for the GUID data blocks - */ -static int parse_wdg(struct device *wmi_bus_dev, struct acpi_device *device) -{ - struct acpi_buffer out = {ACPI_ALLOCATE_BUFFER, NULL}; - const struct guid_block *gblock; - struct wmi_block *wblock, *next; - union acpi_object *obj; - acpi_status status; - int retval = 0; - u32 i, total; - - status = acpi_evaluate_object(device->handle, "_WDG", NULL, &out); - if (ACPI_FAILURE(status)) - return -ENXIO; - - obj = 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]); - - if (guid_already_parsed_for_legacy(device, &gblock[i].guid)) - continue; - - wblock = kzalloc(sizeof(*wblock), GFP_KERNEL); - if (!wblock) { - retval = -ENOMEM; - break; - } - - wblock->acpi_device = device; - wblock->gblock = gblock[i]; - - retval = wmi_create_device(wmi_bus_dev, wblock, device); - if (retval) { - kfree(wblock); - continue; - } - - list_add_tail(&wblock->list, &wmi_block_list); - - if (debug_event) { - wblock->handler = wmi_notify_debug; - wmi_method_enable(wblock, true); - } - } - - /* - * Now that all of the devices are created, add them to the - * device tree and probe subdrivers. - */ - list_for_each_entry_safe(wblock, next, &wmi_block_list, list) { - if (wblock->acpi_device != device) - continue; - - retval = device_add(&wblock->dev.dev); - if (retval) { - dev_err(wmi_bus_dev, "failed to register %pUL\n", - &wblock->gblock.guid); - if (debug_event) - wmi_method_enable(wblock, false); - list_del(&wblock->list); - put_device(&wblock->dev.dev); - } - } - -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; - case -ENODEV: - return AE_NOT_FOUND; - case -ETIME: - return AE_TIME; - default: - return AE_OK; - } -} - -static void acpi_wmi_notify_handler(acpi_handle handle, u32 event, - void *context) -{ - struct wmi_block *wblock = NULL, *iter; - - list_for_each_entry(iter, &wmi_block_list, list) { - struct guid_block *block = &iter->gblock; - - if (iter->acpi_device->handle == handle && - (block->flags & ACPI_WMI_EVENT) && - (block->notify_id == event)) { - wblock = iter; - break; - } - } - - if (!wblock) - return; - - /* If a driver is bound, then notify the driver. */ - if (test_bit(WMI_PROBED, &wblock->flags) && wblock->dev.dev.driver) { - struct wmi_driver *driver = drv_to_wdrv(wblock->dev.dev.driver); - struct acpi_buffer evdata = { ACPI_ALLOCATE_BUFFER, NULL }; - acpi_status status; - - if (!driver->no_notify_data) { - status = get_event_data(wblock, &evdata); - if (ACPI_FAILURE(status)) { - dev_warn(&wblock->dev.dev, "failed to get event data\n"); - return; - } - } - - if (driver->notify) - driver->notify(&wblock->dev, evdata.pointer); - - kfree(evdata.pointer); - } else if (wblock->handler) { - /* Legacy handler */ - wblock->handler(event, wblock->handler_data); - } - - if (debug_event) - pr_info("DEBUG: GUID %pUL event 0x%02X\n", &wblock->gblock.guid, event); - - acpi_bus_generate_netlink_event( - wblock->acpi_device->pnp.device_class, - dev_name(&wblock->dev.dev), - event, 0); -} - -static int acpi_wmi_remove(struct platform_device *device) -{ - struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev); - - acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY, - acpi_wmi_notify_handler); - acpi_remove_address_space_handler(acpi_device->handle, - ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler); - wmi_free_devices(acpi_device); - device_unregister(dev_get_drvdata(&device->dev)); - - return 0; -} - -static int acpi_wmi_probe(struct platform_device *device) -{ - struct acpi_device *acpi_device; - struct device *wmi_bus_dev; - acpi_status status; - int error; - - acpi_device = ACPI_COMPANION(&device->dev); - if (!acpi_device) { - dev_err(&device->dev, "ACPI companion is missing\n"); - return -ENODEV; - } - - status = acpi_install_address_space_handler(acpi_device->handle, - ACPI_ADR_SPACE_EC, - &acpi_wmi_ec_space_handler, - NULL, NULL); - if (ACPI_FAILURE(status)) { - dev_err(&device->dev, "Error installing EC region handler\n"); - return -ENODEV; - } - - status = acpi_install_notify_handler(acpi_device->handle, - ACPI_ALL_NOTIFY, - acpi_wmi_notify_handler, - NULL); - if (ACPI_FAILURE(status)) { - dev_err(&device->dev, "Error installing notify handler\n"); - error = -ENODEV; - goto err_remove_ec_handler; - } - - wmi_bus_dev = device_create(&wmi_bus_class, &device->dev, MKDEV(0, 0), - NULL, "wmi_bus-%s", dev_name(&device->dev)); - if (IS_ERR(wmi_bus_dev)) { - error = PTR_ERR(wmi_bus_dev); - goto err_remove_notify_handler; - } - dev_set_drvdata(&device->dev, wmi_bus_dev); - - error = parse_wdg(wmi_bus_dev, acpi_device); - if (error) { - pr_err("Failed to parse WDG method\n"); - goto err_remove_busdev; - } - - return 0; - -err_remove_busdev: - device_unregister(wmi_bus_dev); - -err_remove_notify_handler: - acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY, - acpi_wmi_notify_handler); - -err_remove_ec_handler: - acpi_remove_address_space_handler(acpi_device->handle, - ACPI_ADR_SPACE_EC, - &acpi_wmi_ec_space_handler); - - return error; -} - -int __must_check __wmi_driver_register(struct wmi_driver *driver, - struct module *owner) -{ - driver->driver.owner = owner; - driver->driver.bus = &wmi_bus_type; - - return driver_register(&driver->driver); -} -EXPORT_SYMBOL(__wmi_driver_register); - -void wmi_driver_unregister(struct wmi_driver *driver) -{ - driver_unregister(&driver->driver); -} -EXPORT_SYMBOL(wmi_driver_unregister); - -static struct platform_driver acpi_wmi_driver = { - .driver = { - .name = "acpi-wmi", - .acpi_match_table = wmi_device_ids, - }, - .probe = acpi_wmi_probe, - .remove = acpi_wmi_remove, -}; - -static int __init acpi_wmi_init(void) -{ - int error; - - if (acpi_disabled) - return -ENODEV; - - error = class_register(&wmi_bus_class); - if (error) - return error; - - error = bus_register(&wmi_bus_type); - if (error) - goto err_unreg_class; - - error = platform_driver_register(&acpi_wmi_driver); - if (error) { - pr_err("Error loading mapper\n"); - goto err_unreg_bus; - } - - return 0; - -err_unreg_bus: - bus_unregister(&wmi_bus_type); - -err_unreg_class: - class_unregister(&wmi_bus_class); - - return error; -} - -static void __exit acpi_wmi_exit(void) -{ - platform_driver_unregister(&acpi_wmi_driver); - bus_unregister(&wmi_bus_type); - class_unregister(&wmi_bus_class); -} - -subsys_initcall_sync(acpi_wmi_init); -module_exit(acpi_wmi_exit); |