/* * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) * * Copyright (C) 2001, 2002 Paul Diefenbaugh * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 #include #include #include #include #include #include #include #include #include #ifdef CONFIG_X86 #include #endif #include #include #include #include #include "internal.h" #define _COMPONENT ACPI_BUS_COMPONENT ACPI_MODULE_NAME("bus"); struct acpi_device *acpi_root; struct proc_dir_entry *acpi_root_dir; EXPORT_SYMBOL(acpi_root_dir); #define STRUCT_TO_INT(s) (*((int*)&s)) static int set_power_nocheck(const struct dmi_system_id *id) { printk(KERN_NOTICE PREFIX "%s detected - " "disable power check in power transistion\n", id->ident); acpi_power_nocheck = 1; return 0; } static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = { { set_power_nocheck, "HP Pavilion 05", { DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"), DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL}, {}, }; /* -------------------------------------------------------------------------- Device Management -------------------------------------------------------------------------- */ int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) { acpi_status status = AE_OK; if (!device) return -EINVAL; /* TBD: Support fixed-feature devices */ status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); if (ACPI_FAILURE(status) || !*device) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", handle)); return -ENODEV; } return 0; } EXPORT_SYMBOL(acpi_bus_get_device); acpi_status acpi_bus_get_status_handle(acpi_handle handle, unsigned long long *sta) { acpi_status status; status = acpi_evaluate_integer(handle, "_STA", NULL, sta); if (ACPI_SUCCESS(status)) return AE_OK; if (status == AE_NOT_FOUND) { *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; return AE_OK; } return status; } int acpi_bus_get_status(struct acpi_device *device) { acpi_status status; unsigned long long sta; status = acpi_bus_get_status_handle(device->handle, &sta); if (ACPI_FAILURE(status)) return -ENODEV; STRUCT_TO_INT(device->status) = (int) sta; if (device->status.functional && !device->status.present) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " "functional but not present;\n", device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status))); } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status))); return 0; } EXPORT_SYMBOL(acpi_bus_get_status); void acpi_bus_private_data_handler(acpi_handle handle, void *context) { return; } EXPORT_SYMBOL(acpi_bus_private_data_handler); int acpi_bus_get_private_data(acpi_handle handle, void **data) { acpi_status status = AE_OK; if (!*data) return -EINVAL; status = acpi_get_data(handle, acpi_bus_private_data_handler, data); if (ACPI_FAILURE(status) || !*data) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", handle)); return -ENODEV; } return 0; } EXPORT_SYMBOL(acpi_bus_get_private_data); /* -------------------------------------------------------------------------- Power Management -------------------------------------------------------------------------- */ int acpi_bus_get_power(acpi_handle handle, int *state) { int result = 0; acpi_status status = 0; struct acpi_device *device = NULL; unsigned long long psc = 0; result = acpi_bus_get_device(handle, &device); if (result) return result; *state = ACPI_STATE_UNKNOWN; if (!device->flags.power_manageable) { /* TBD: Non-recursive algorithm for walking up hierarchy */ if (device->parent) *state = device->parent->power.state; else *state = ACPI_STATE_D0; } else { /* * Get the device's power state either directly (via _PSC) or * indirectly (via power resources). */ if (device->power.flags.explicit_get) { status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc); if (ACPI_FAILURE(status)) return -ENODEV; device->power.state = (int)psc; } else if (device->power.flags.power_resources) { result = acpi_power_get_inferred_state(device); if (result) return result; } *state = device->power.state; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", device->pnp.bus_id, device->power.state)); return 0; } EXPORT_SYMBOL(acpi_bus_get_power); int acpi_bus_set_power(acpi_handle handle, int state) { int result = 0; acpi_status status = AE_OK; struct acpi_device *device = NULL; char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; result = acpi_bus_get_device(handle, &device); if (result) return result; if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) return -EINVAL; /* Make sure this is a valid target state */ if (!device->flags.power_manageable) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n", kobject_name(&device->dev.kobj))); return -ENODEV; } /* * Get device's current power state */ if (!acpi_power_nocheck) { /* * Maybe the incorrect power state is returned on the bogus * bios, which is different with the real power state. * For example: the bios returns D0 state and the real power * state is D3. OS expects to set the device to D0 state. In * such case if OS uses the power state returned by the BIOS, * the device can't be transisted to the correct power state. * So if the acpi_power_nocheck is set, it is unnecessary to * get the power state by calling acpi_bus_get_power. */ acpi_bus_get_power(device->handle, &device->power.state); } if ((state == device->power.state) && !device->flags.force_power_state) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state)); return 0; } if (!device->power.states[state].flags.valid) { printk(KERN_WARNING PREFIX "Device does not support D%d\n", state); return -ENODEV; } if (device->parent && (state < device->parent->power.state)) { printk(KERN_WARNING PREFIX "Cannot set device to a higher-powered" " state than parent\n"); return -ENODEV; } /* * Transition Power * ---------------- * On transitions to a high-powered state we first apply power (via * power resources) then evalute _PSx. Conversly for transitions to * a lower-powered state. */ if (state < device->power.state) { if (device->power.flags.power_resources) { result = acpi_power_transition(device, state); if (result) goto end; } if (device->power.states[state].flags.explicit_set) { status = acpi_evaluate_object(device->handle, object_name, NULL, NULL); if (ACPI_FAILURE(status)) { result = -ENODEV; goto end; } } } else { if (device->power.states[state].flags.explicit_set) { status = acpi_evaluate_object(device->handle, object_name, NULL, NULL); if (ACPI_FAILURE(status)) { result = -ENODEV; goto end; } } if (device->power.flags.power_resources) { result = acpi_power_transition(device, state); if (result) goto end; } } end: if (result) printk(KERN_WARNING PREFIX "Device [%s] failed to transition to D%d\n", device->pnp.bus_id, state); else { device->power.state = state; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] transitioned to D%d\n", device->pnp.bus_id, state)); } return result; } EXPORT_SYMBOL(acpi_bus_set_power); bool acpi_bus_power_manageable(acpi_handle handle) { struct acpi_device *device; int result; result = acpi_bus_get_device(handle, &device); return result ? false : device->flags.power_manageable; } EXPORT_SYMBOL(acpi_bus_power_manageable); bool acpi_bus_can_wakeup(acpi_handle handle) { struct acpi_device *device; int result; result = acpi_bus_get_device(handle, &device); return result ? false : device->wakeup.flags.valid; } EXPORT_SYMBOL(acpi_bus_can_wakeup); static void acpi_print_osc_error(acpi_handle handle, struct acpi_osc_context *context, char *error) { struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; int i; if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) printk(KERN_DEBUG "%s\n", error); else { printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); kfree(buffer.pointer); } printk(KERN_DEBUG"_OSC request data:"); for (i = 0; i < context->cap.length; i += sizeof(u32)) printk("%x ", *((u32 *)(context->cap.pointer + i))); printk("\n"); } static u8 hex_val(unsigned char c) { return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10; } static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) { int i; static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 24, 26, 28, 30, 32, 34}; if (strlen(str) != 36) return AE_BAD_PARAMETER; for (i = 0; i < 36; i++) { if (i == 8 || i == 13 || i == 18 || i == 23) { if (str[i] != '-') return AE_BAD_PARAMETER; } else if (!isxdigit(str[i])) return AE_BAD_PARAMETER; } for (i = 0; i < 16; i++) { uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4; uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]); } return AE_OK; } acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) { acpi_status status; struct acpi_object_list input; union acpi_object in_params[4]; union acpi_object *out_obj; u8 uuid[16]; u32 errors; struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; if (!context) return AE_ERROR; if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) return AE_ERROR; context->ret.length = ACPI_ALLOCATE_BUFFER; context->ret.pointer = NULL; /* Setting up input parameters */ input.count = 4; input.pointer = in_params; in_params[0].type = ACPI_TYPE_BUFFER; in_params[0].buffer.length = 16; in_params[0].buffer.pointer = uuid; in_params[1].type = ACPI_TYPE_INTEGER; in_params[1].integer.value = context->rev; in_params[2].type = ACPI_TYPE_INTEGER; in_params[2].integer.value = context->cap.length/sizeof(u32); in_params[3].type = ACPI_TYPE_BUFFER; in_params[3].buffer.length = context->cap.length; in_params[3].buffer.pointer = context->cap.pointer; status = acpi_evaluate_object(handle, "_OSC", &input, &output); if (ACPI_FAILURE(status)) return status; if (!output.length) return AE_NULL_OBJECT; out_obj = output.pointer; if (out_obj->type != ACPI_TYPE_BUFFER || out_obj->buffer.length != context->cap.length) { acpi_print_osc_error(handle, context, "_OSC evaluation returned wrong type"); status = AE_TYPE; goto out_kfree; } /* Need to ignore the bit0 in result code */ errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); if (errors) { if (errors & OSC_REQUEST_ERROR) acpi_print_osc_error(handle, context, "_OSC request failed"); if (errors & OSC_INVALID_UUID_ERROR) acpi_print_osc_error(handle, context, "_OSC invalid UUID"); if (errors & OSC_INVALID_REVISION_ERROR) acpi_print_osc_error(handle, context, "_OSC invalid revision"); if (errors & OSC_CAPABILITIES_MASK_ERROR) { if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] & OSC_QUERY_ENABLE) goto out_success; status = AE_SUPPORT; goto out_kfree; } status = AE_ERROR; goto out_kfree; } out_success: context->ret.length = out_obj->buffer.length; context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); if (!context->ret.pointer) { status = AE_NO_MEMORY; goto out_kfree; } memcpy(context->ret.pointer, out_obj->buffer.pointer, context->ret.length); status = AE_OK; out_kfree: kfree(output.pointer); if (status != AE_OK) context->ret.pointer = NULL; return status; } EXPORT_SYMBOL(acpi_run_osc); static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; static void acpi_bus_osc_support(void) { u32 capbuf[2]; struct acpi_osc_context context = { .uuid_str = sb_uuid_str, .rev = 1, .cap.length = 8, .cap.pointer = capbuf, }; acpi_handle handle; capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ #ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; #endif if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) return; if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) kfree(context.ret.pointer); /* do we need to check the returned cap? Sounds no */ } /* -------------------------------------------------------------------------- Event Management -------------------------------------------------------------------------- */ #ifdef CONFIG_ACPI_PROC_EVENT static DEFINE_SPINLOCK(acpi_bus_event_lock); LIST_HEAD(acpi_bus_event_list); DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); extern int event_is_open; int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) { struct acpi_bus_event *event; unsigned long flags = 0; /* drop event on the floor if no one's listening */ if (!event_is_open) return 0; event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); if (!event) return -ENOMEM; strcpy(event->device_class, device_class); strcpy(event->bus_id, bus_id); event->type = type; event->data = data; spin_lock_irqsave(&acpi_bus_event_lock, flags); list_add_tail(&event->node, &acpi_bus_event_list); spin_unlock_irqrestore(&acpi_bus_event_lock, flags); wake_up_interruptible(&acpi_bus_event_queue); return 0; } EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) { if (!device) return -EINVAL; return acpi_bus_generate_proc_event4(device->pnp.device_class, device->pnp.bus_id, type, data); } EXPORT_SYMBOL(acpi_bus_generate_proc_event); int acpi_bus_receive_event(struct acpi_bus_event *event) { unsigned long flags = 0; struct acpi_bus_event *entry = NULL; DECLARE_WAITQUEUE(wait, current); if (!event) return -EINVAL; if (list_empty(&acpi_bus_event_list)) { set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&acpi_bus_event_queue, &wait); if (list_empty(&acpi_bus_event_list)) schedule(); remove_wait_queue(&acpi_bus_event_queue, &wait); set_current_state(TASK_RUNNING); if (signal_pending(current)) return -ERESTARTSYS; } spin_lock_irqsave(&acpi_bus_event_lock, flags); if (!list_empty(&acpi_bus_event_list)) { entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node); list_del(&entry->node); } spin_unlock_irqrestore(&acpi_bus_event_lock, flags); if (!entry) return -ENODEV; memcpy(event, entry, sizeof(struct acpi_bus_event)); kfree(entry); return 0; } #endif /* CONFIG_ACPI_PROC_EVENT */ /* -------------------------------------------------------------------------- Notification Handling -------------------------------------------------------------------------- */ static void acpi_bus_check_device(acpi_handle handle) { struct acpi_device *device; acpi_status status; struct acpi_device_status old_status; if (acpi_bus_get_device(handle, &device)) return; if (!device) return; old_status = device->status; /* * Make sure this device's parent is present before we go about * messing with the device. */ if (device->parent && !device->parent->status.present) { device->status = device->parent->status; return; } status = acpi_bus_get_status(device); if (ACPI_FAILURE(status)) return; if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) return; /* * Device Insertion/Removal */ if ((device->status.present) && !(old_status.present)) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); /* TBD: Handle device insertion */ } else if (!(device->status.present) && (old_status.present)) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); /* TBD: Handle device removal */ } } static void acpi_bus_check_scope(acpi_handle handle) { /* Status Change? */ acpi_bus_check_device(handle); /* * TBD: Enumerate child devices within this device's scope and * run acpi_bus_check_device()'s on them. */ } static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); int register_acpi_bus_notifier(struct notifier_block *nb) { return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); } EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); void unregister_acpi_bus_notifier(struct notifier_block *nb) { blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); } EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); /** * acpi_bus_notify * --------------- * Callback for all 'system-level' device notifications (values 0x00-0x7F). */ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) { struct acpi_device *device = NULL; struct acpi_driver *driver; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", type, handle)); blocking_notifier_call_chain(&acpi_bus_notify_list, type, (void *)handle); switch (type) { case ACPI_NOTIFY_BUS_CHECK: acpi_bus_check_scope(handle); /* * TBD: We'll need to outsource certain events to non-ACPI * drivers via the device manager (device.c). */ break; case ACPI_NOTIFY_DEVICE_CHECK: acpi_bus_check_device(handle); /* * TBD: We'll need to outsource certain events to non-ACPI * drivers via the device manager (device.c). */ break; case ACPI_NOTIFY_DEVICE_WAKE: /* TBD */ break; case ACPI_NOTIFY_EJECT_REQUEST: /* TBD */ break; case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: /* TBD: Exactly what does 'light' mean? */ break; case ACPI_NOTIFY_FREQUENCY_MISMATCH: /* TBD */ break; case ACPI_NOTIFY_BUS_MODE_MISMATCH: /* TBD */ break; case ACPI_NOTIFY_POWER_FAULT: /* TBD */ break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n", type)); break; } acpi_bus_get_device(handle, &device); if (device) { driver = device->driver; if (driver && driver->ops.notify && (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) driver->ops.notify(device, type); } } /* -------------------------------------------------------------------------- Initialization/Cleanup -------------------------------------------------------------------------- */ static int __init acpi_bus_init_irq(void) { acpi_status status = AE_OK; union acpi_object arg = { ACPI_TYPE_INTEGER }; struct acpi_object_list arg_list = { 1, &arg }; char *message = NULL; /* * Let the system know what interrupt model we are using by * evaluating the \_PIC object, if exists. */ switch (acpi_irq_model) { case ACPI_IRQ_MODEL_PIC: message = "PIC"; break; case ACPI_IRQ_MODEL_IOAPIC: message = "IOAPIC"; break; case ACPI_IRQ_MODEL_IOSAPIC: message = "IOSAPIC"; break; case ACPI_IRQ_MODEL_PLATFORM: message = "platform specific model"; break; default: printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); return -ENODEV; } printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); arg.integer.value = acpi_irq_model; status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); return -ENODEV; } return 0; } u8 acpi_gbl_permanent_mmap; void __init acpi_early_init(void) { acpi_status status = AE_OK; if (acpi_disabled) return; printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); /* enable workarounds, unless strict ACPI spec. compliance */ if (!acpi_strict) acpi_gbl_enable_interpreter_slack = TRUE; acpi_gbl_permanent_mmap = 1; status = acpi_reallocate_root_table(); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to reallocate ACPI tables\n"); goto error0; } status = acpi_initialize_subsystem(); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to initialize the ACPI Interpreter\n"); goto error0; } status = acpi_load_tables(); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to load the System Description Tables\n"); goto error0; } #ifdef CONFIG_X86 if (!acpi_ioapic) { /* compatible (0) means level (3) */ if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; } /* Set PIC-mode SCI trigger type */ acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); } else { /* * now that acpi_gbl_FADT is initialized, * update it with result from INT_SRC_OVR parsing */ acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; } #endif status = acpi_enable_subsystem(~ (ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE)); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); goto error0; } return; error0: disable_acpi(); return; } static int __init acpi_bus_init(void) { int result = 0; acpi_status status = AE_OK; extern acpi_status acpi_os_initialize1(void); acpi_os_initialize1(); status = acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to start the ACPI Interpreter\n"); goto error1; } /* * ACPI 2.0 requires the EC driver to be loaded and work before * the EC device is found in the namespace (i.e. before acpi_initialize_objects() * is called). * * This is accomplished by looking for the ECDT table, and getting * the EC parameters out of that. */ status = acpi_ec_ecdt_probe(); /* Ignore result. Not having an ECDT is not fatal. */ acpi_bus_osc_support(); status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); goto error1; } /* * Maybe EC region is required at bus_scan/acpi_get_devices. So it * is necessary to enable it as early as possible. */ acpi_boot_ec_enable(); printk(KERN_INFO PREFIX "Interpreter enabled\n"); /* Initialize sleep structures */ acpi_sleep_init(); /* * Get the system interrupt model and evaluate \_PIC. */ result = acpi_bus_init_irq(); if (result) goto error1; /* * Register the for all standard device notifications. */ status = acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, &acpi_bus_notify, NULL); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to register for device notifications\n"); goto error1; } /* * Create the top ACPI proc directory */ acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); return 0; /* Mimic structured exception handling */ error1: acpi_terminate(); return -ENODEV; } struct kobject *acpi_kobj; static int __init acpi_init(void) { int result = 0; if (acpi_disabled) { printk(KERN_INFO PREFIX "Interpreter disabled.\n"); return -ENODEV; } acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); if (!acpi_kobj) { printk(KERN_WARNING "%s: kset create error\n", __func__); acpi_kobj = NULL; } init_acpi_device_notify(); result = acpi_bus_init(); if (!result) { pci_mmcfg_late_init(); if (!(pm_flags & PM_APM)) pm_flags |= PM_ACPI; else { printk(KERN_INFO PREFIX "APM is already active, exiting\n"); disable_acpi(); result = -ENODEV; } } else disable_acpi(); if (acpi_disabled) return result; /* * If the laptop falls into the DMI check table, the power state check * will be disabled in the course of device power transistion. */ dmi_check_system(power_nocheck_dmi_table); acpi_scan_init(); acpi_ec_init(); acpi_power_init(); acpi_system_init(); acpi_debug_init(); acpi_sleep_proc_init(); acpi_wakeup_device_init(); return result; } subsys_initcall(acpi_init);