diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/acpi/bus.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/acpi/bus.c')
-rw-r--r-- | drivers/acpi/bus.c | 775 |
1 files changed, 775 insertions, 0 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c new file mode 100644 index 00000000000..4edff173857 --- /dev/null +++ b/drivers/acpi/bus.c @@ -0,0 +1,775 @@ +/* + * 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/list.h> +#include <linux/sched.h> +#include <linux/pm.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 + +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; + + ACPI_FUNCTION_TRACE("acpi_bus_get_device"); + + if (!device) + return_VALUE(-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_WARN, "No context for object [%p]\n", + handle)); + return_VALUE(-ENODEV); + } + + return_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_bus_get_status"); + + if (!device) + return_VALUE(-EINVAL); + + /* + * Evaluate _STA if present. + */ + if (device->flags.dynamic_status) { + status = acpi_evaluate_integer(device->handle, "_STA", NULL, &sta); + if (ACPI_FAILURE(status)) + return_VALUE(-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_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_bus_get_power"); + + result = acpi_bus_get_device(handle, &device); + if (result) + return_VALUE(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_VALUE(-ENODEV); + device->power.state = (int) psc; + } + else if (device->power.flags.power_resources) { + result = acpi_power_get_inferred_state(device); + if (result) + return_VALUE(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_VALUE(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'}; + + ACPI_FUNCTION_TRACE("acpi_bus_set_power"); + + result = acpi_bus_get_device(handle, &device); + if (result) + return_VALUE(result); + + if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) + return_VALUE(-EINVAL); + + /* Make sure this is a valid target state */ + + if (!device->flags.power_manageable) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device is not power manageable\n")); + return_VALUE(-ENODEV); + } + if (state == device->power.state) { + ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", state)); + return_VALUE(0); + } + if (!device->power.states[state].flags.valid) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n", state)); + return_VALUE(-ENODEV); + } + if (device->parent && (state < device->parent->power.state)) { + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Cannot set device to a higher-powered state than parent\n")); + return_VALUE(-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) + ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Error 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_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_bus_generate_event"); + + if (!device) + return_VALUE(-EINVAL); + + /* drop event on the floor if no one's listening */ + if (!event_is_open) + return_VALUE(0); + + event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); + if (!event) + return_VALUE(-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_VALUE(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); + + ACPI_FUNCTION_TRACE("acpi_bus_receive_event"); + + if (!event) + return_VALUE(-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_VALUE(-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_VALUE(-ENODEV); + + memcpy(event, entry, sizeof(struct acpi_bus_event)); + + kfree(entry); + + return_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_bus_check_device"); + + if (!device) + return_VALUE(-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_VALUE(0); + } + + status = acpi_bus_get_status(device); + if (ACPI_FAILURE(status)) + return_VALUE(-ENODEV); + + if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) + return_VALUE(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_VALUE(0); +} + + +static int +acpi_bus_check_scope ( + struct acpi_device *device) +{ + int result = 0; + int status_changed = 0; + + ACPI_FUNCTION_TRACE("acpi_bus_check_scope"); + + if (!device) + return_VALUE(-EINVAL); + + /* Status Change? */ + result = acpi_bus_check_device(device, &status_changed); + if (result) + return_VALUE(result); + + if (!status_changed) + return_VALUE(0); + + /* + * TBD: Enumerate child devices within this device's scope and + * run acpi_bus_check_device()'s on them. + */ + + return_VALUE(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; + + ACPI_FUNCTION_TRACE("acpi_bus_notify"); + + if (acpi_bus_get_device(handle, &device)) + return_VOID; + + 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_VOID; +} + +/* -------------------------------------------------------------------------- + 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; + + ACPI_FUNCTION_TRACE("acpi_bus_init_irq"); + + /* + * 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_VALUE(-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_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n")); + return_VALUE(-ENODEV); + } + + return_VALUE(0); +} + + +void __init +acpi_early_init (void) +{ + acpi_status status = AE_OK; + struct acpi_buffer buffer = {sizeof(acpi_fadt), &acpi_fadt}; + + ACPI_FUNCTION_TRACE("acpi_early_init"); + + if (acpi_disabled) + return_VOID; + + /* 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_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_VOID; + +error0: + disable_acpi(); + return_VOID; +} + +static int __init +acpi_bus_init (void) +{ + int result = 0; + acpi_status status = AE_OK; + extern acpi_status acpi_os_initialize1(void); + + ACPI_FUNCTION_TRACE("acpi_bus_init"); + + 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_VALUE(0); + + /* Mimic structured exception handling */ +error1: + acpi_terminate(); + return_VALUE(-ENODEV); +} + +decl_subsys(acpi,NULL,NULL); + +static int __init acpi_init (void) +{ + int result = 0; + + ACPI_FUNCTION_TRACE("acpi_init"); + + printk(KERN_INFO PREFIX "Subsystem revision %08x\n", + ACPI_CA_VERSION); + + if (acpi_disabled) { + printk(KERN_INFO PREFIX "Interpreter disabled.\n"); + return_VALUE(-ENODEV); + } + + firmware_register(&acpi_subsys); + + result = acpi_bus_init(); + + if (!result) { +#ifdef CONFIG_PM + 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_VALUE(result); +} + +subsys_initcall(acpi_init); |