/* * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) * * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.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/module.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/sched.h> #include <linux/pm.h> #include <linux/pm_legacy.h> #include <linux/device.h> #include <linux/proc_fs.h> #ifdef CONFIG_X86 #include <asm/mpspec.h> #endif #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define _COMPONENT ACPI_BUS_COMPONENT ACPI_MODULE_NAME("acpi_bus") #ifdef CONFIG_X86 extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger); #endif struct fadt_descriptor acpi_fadt; EXPORT_SYMBOL(acpi_fadt); struct acpi_device *acpi_root; struct proc_dir_entry *acpi_root_dir; EXPORT_SYMBOL(acpi_root_dir); #define STRUCT_TO_INT(s) (*((int*)&s)) /* -------------------------------------------------------------------------- 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); int acpi_bus_get_status(struct acpi_device *device) { acpi_status status = AE_OK; unsigned long sta = 0; if (!device) return -EINVAL; /* * Evaluate _STA if present. */ if (device->flags.dynamic_status) { status = acpi_evaluate_integer(device->handle, "_STA", NULL, &sta); if (ACPI_FAILURE(status)) return -ENODEV; STRUCT_TO_INT(device->status) = (int)sta; } /* * Otherwise we assume the status of our parent (unless we don't * have one, in which case status is implied). */ else if (device->parent) device->status = device->parent->status; else STRUCT_TO_INT(device->status) = 0x0F; if (device->status.functional && !device->status.present) { printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: " "functional but not present; setting present\n", device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status)); device->status.present = 1; } 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); /* -------------------------------------------------------------------------- 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 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", device->kobj.name)); return -ENODEV; } /* * Get device's current power state if it's unknown * This means device power state isn't initialized or previous setting failed */ if (!device->flags.force_power_state) { if (device->power.state == ACPI_STATE_UNKNOWN) acpi_bus_get_power(device->handle, &device->power.state); if (state == device->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 "Transitioning device [%s] to D%d\n", device->pnp.bus_id, state); else 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); /* -------------------------------------------------------------------------- Event Management -------------------------------------------------------------------------- */ 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_event(struct acpi_device *device, u8 type, int data) { struct acpi_bus_event *event = NULL; unsigned long flags = 0; if (!device) return -EINVAL; /* 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->pnp.device_class); strcpy(event->bus_id, device->pnp.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(acpi_bus_generate_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); entry = list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node); if (entry) 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; } EXPORT_SYMBOL(acpi_bus_receive_event); /* -------------------------------------------------------------------------- Notification Handling -------------------------------------------------------------------------- */ static int acpi_bus_check_device(struct acpi_device *device, int *status_changed) { acpi_status status = 0; struct acpi_device_status old_status; if (!device) return -EINVAL; if (status_changed) *status_changed = 0; 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; if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) { if (status_changed) *status_changed = 1; } return 0; } status = acpi_bus_get_status(device); if (ACPI_FAILURE(status)) return -ENODEV; if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) return 0; if (status_changed) *status_changed = 1; /* * 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 */ } return 0; } static int acpi_bus_check_scope(struct acpi_device *device) { int result = 0; int status_changed = 0; if (!device) return -EINVAL; /* Status Change? */ result = acpi_bus_check_device(device, &status_changed); if (result) return result; if (!status_changed) return 0; /* * TBD: Enumerate child devices within this device's scope and * run acpi_bus_check_device()'s on them. */ return 0; } /** * 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) { int result = 0; struct acpi_device *device = NULL; if (acpi_bus_get_device(handle, &device)) return; switch (type) { case ACPI_NOTIFY_BUS_CHECK: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS CHECK notification for device [%s]\n", device->pnp.bus_id)); result = acpi_bus_check_scope(device); /* * 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_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK notification for device [%s]\n", device->pnp.bus_id)); result = acpi_bus_check_device(device, NULL); /* * TBD: We'll need to outsource certain events to non-ACPI * drivers via the device manager (device.c). */ break; case ACPI_NOTIFY_DEVICE_WAKE: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE WAKE notification for device [%s]\n", device->pnp.bus_id)); /* TBD */ break; case ACPI_NOTIFY_EJECT_REQUEST: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received EJECT REQUEST notification for device [%s]\n", device->pnp.bus_id)); /* TBD */ break; case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received DEVICE CHECK LIGHT notification for device [%s]\n", device->pnp.bus_id)); /* TBD: Exactly what does 'light' mean? */ break; case ACPI_NOTIFY_FREQUENCY_MISMATCH: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received FREQUENCY MISMATCH notification for device [%s]\n", device->pnp.bus_id)); /* TBD */ break; case ACPI_NOTIFY_BUS_MODE_MISMATCH: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received BUS MODE MISMATCH notification for device [%s]\n", device->pnp.bus_id)); /* TBD */ break; case ACPI_NOTIFY_POWER_FAULT: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received POWER FAULT notification for device [%s]\n", device->pnp.bus_id)); /* TBD */ break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Received unknown/unsupported notification [%08x]\n", type)); break; } return; } /* -------------------------------------------------------------------------- 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; 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; } void __init acpi_early_init(void) { acpi_status status = AE_OK; struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt }; 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; 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; } /* * Get a separate copy of the FADT for use by other drivers. */ status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &buffer); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to get the FADT\n"); goto error0; } #ifdef CONFIG_X86 if (!acpi_ioapic) { extern acpi_interrupt_flags acpi_sci_flags; /* compatible (0) means level (3) */ if (acpi_sci_flags.trigger == 0) acpi_sci_flags.trigger = 3; /* Set PIC-mode SCI trigger type */ acpi_pic_sci_set_trigger(acpi_fadt.sci_int, acpi_sci_flags.trigger); } else { extern int acpi_sci_override_gsi; /* * now that acpi_fadt is initialized, * update it with result from INT_SRC_OVR parsing */ acpi_fadt.sci_int = 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); status = 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; } if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to initialize ACPI OS objects\n"); goto error1; } #ifdef CONFIG_ACPI_EC /* * 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. */ #endif status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); if (ACPI_FAILURE(status)) { printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); goto error1; } printk(KERN_INFO PREFIX "Interpreter enabled\n"); /* * 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; } decl_subsys(acpi, NULL, NULL); static int __init acpi_init(void) { int result = 0; if (acpi_disabled) { printk(KERN_INFO PREFIX "Interpreter disabled.\n"); return -ENODEV; } result = firmware_register(&acpi_subsys); if (result < 0) printk(KERN_WARNING "%s: firmware_register error: %d\n", __FUNCTION__, result); result = acpi_bus_init(); if (!result) { #ifdef CONFIG_PM_LEGACY if (!PM_IS_ACTIVE()) pm_active = 1; else { printk(KERN_INFO PREFIX "APM is already active, exiting\n"); disable_acpi(); result = -ENODEV; } #endif } else disable_acpi(); return result; } subsys_initcall(acpi_init);