775 lines
19 KiB
C
775 lines
19 KiB
C
/*
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* acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
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*
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/list.h>
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#include <linux/sched.h>
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#include <linux/pm.h>
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#include <linux/pm_legacy.h>
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#include <linux/device.h>
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#include <linux/proc_fs.h>
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#ifdef CONFIG_X86
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#include <asm/mpspec.h>
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#endif
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("acpi_bus")
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#ifdef CONFIG_X86
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extern void __init acpi_pic_sci_set_trigger(unsigned int irq, u16 trigger);
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#endif
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struct fadt_descriptor acpi_fadt;
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EXPORT_SYMBOL(acpi_fadt);
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struct acpi_device *acpi_root;
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struct proc_dir_entry *acpi_root_dir;
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EXPORT_SYMBOL(acpi_root_dir);
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#define STRUCT_TO_INT(s) (*((int*)&s))
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/* --------------------------------------------------------------------------
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Device Management
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-------------------------------------------------------------------------- */
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int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
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{
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE("acpi_bus_get_device");
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if (!device)
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return_VALUE(-EINVAL);
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/* TBD: Support fixed-feature devices */
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status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
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if (ACPI_FAILURE(status) || !*device) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "No context for object [%p]\n",
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handle));
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return_VALUE(-ENODEV);
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}
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return_VALUE(0);
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}
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EXPORT_SYMBOL(acpi_bus_get_device);
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int acpi_bus_get_status(struct acpi_device *device)
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{
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acpi_status status = AE_OK;
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unsigned long sta = 0;
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ACPI_FUNCTION_TRACE("acpi_bus_get_status");
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if (!device)
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return_VALUE(-EINVAL);
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/*
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* Evaluate _STA if present.
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*/
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if (device->flags.dynamic_status) {
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status =
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acpi_evaluate_integer(device->handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status))
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return_VALUE(-ENODEV);
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STRUCT_TO_INT(device->status) = (int)sta;
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}
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/*
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* Otherwise we assume the status of our parent (unless we don't
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* have one, in which case status is implied).
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*/
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else if (device->parent)
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device->status = device->parent->status;
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else
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STRUCT_TO_INT(device->status) = 0x0F;
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if (device->status.functional && !device->status.present) {
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printk(KERN_WARNING PREFIX "Device [%s] status [%08x]: "
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"functional but not present; setting present\n",
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device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status));
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device->status.present = 1;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
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device->pnp.bus_id,
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(u32) STRUCT_TO_INT(device->status)));
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return_VALUE(0);
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}
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EXPORT_SYMBOL(acpi_bus_get_status);
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/* --------------------------------------------------------------------------
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Power Management
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-------------------------------------------------------------------------- */
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int acpi_bus_get_power(acpi_handle handle, int *state)
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{
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int result = 0;
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acpi_status status = 0;
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struct acpi_device *device = NULL;
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unsigned long psc = 0;
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ACPI_FUNCTION_TRACE("acpi_bus_get_power");
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result = acpi_bus_get_device(handle, &device);
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if (result)
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return_VALUE(result);
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*state = ACPI_STATE_UNKNOWN;
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if (!device->flags.power_manageable) {
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/* TBD: Non-recursive algorithm for walking up hierarchy */
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if (device->parent)
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*state = device->parent->power.state;
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else
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*state = ACPI_STATE_D0;
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} else {
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/*
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* Get the device's power state either directly (via _PSC) or
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* indirectly (via power resources).
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*/
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if (device->power.flags.explicit_get) {
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status = acpi_evaluate_integer(device->handle, "_PSC",
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NULL, &psc);
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if (ACPI_FAILURE(status))
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return_VALUE(-ENODEV);
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device->power.state = (int)psc;
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} else if (device->power.flags.power_resources) {
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result = acpi_power_get_inferred_state(device);
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if (result)
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return_VALUE(result);
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}
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*state = device->power.state;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
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device->pnp.bus_id, device->power.state));
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return_VALUE(0);
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}
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EXPORT_SYMBOL(acpi_bus_get_power);
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int acpi_bus_set_power(acpi_handle handle, int state)
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{
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int result = 0;
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acpi_status status = AE_OK;
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struct acpi_device *device = NULL;
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char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
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ACPI_FUNCTION_TRACE("acpi_bus_set_power");
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result = acpi_bus_get_device(handle, &device);
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if (result)
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return_VALUE(result);
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if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
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return_VALUE(-EINVAL);
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/* Make sure this is a valid target state */
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if (!device->flags.power_manageable) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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"Device is not power manageable\n"));
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return_VALUE(-ENODEV);
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}
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/*
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* Get device's current power state if it's unknown
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* This means device power state isn't initialized or previous setting failed
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*/
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if (device->power.state == ACPI_STATE_UNKNOWN)
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acpi_bus_get_power(device->handle, &device->power.state);
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if (state == device->power.state) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
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state));
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return_VALUE(0);
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}
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if (!device->power.states[state].flags.valid) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Device does not support D%d\n",
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state));
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return_VALUE(-ENODEV);
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}
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if (device->parent && (state < device->parent->power.state)) {
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ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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"Cannot set device to a higher-powered state than parent\n"));
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return_VALUE(-ENODEV);
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}
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/*
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* Transition Power
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* ----------------
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* On transitions to a high-powered state we first apply power (via
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* power resources) then evalute _PSx. Conversly for transitions to
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* a lower-powered state.
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*/
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if (state < device->power.state) {
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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if (device->power.states[state].flags.explicit_set) {
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status = acpi_evaluate_object(device->handle,
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object_name, NULL, NULL);
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if (ACPI_FAILURE(status)) {
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result = -ENODEV;
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goto end;
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}
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}
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} else {
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if (device->power.states[state].flags.explicit_set) {
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status = acpi_evaluate_object(device->handle,
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object_name, NULL, NULL);
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if (ACPI_FAILURE(status)) {
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result = -ENODEV;
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goto end;
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}
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}
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if (device->power.flags.power_resources) {
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result = acpi_power_transition(device, state);
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if (result)
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goto end;
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}
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}
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end:
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if (result)
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ACPI_DEBUG_PRINT((ACPI_DB_WARN,
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"Error transitioning device [%s] to D%d\n",
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device->pnp.bus_id, state));
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else
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Device [%s] transitioned to D%d\n",
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device->pnp.bus_id, state));
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return_VALUE(result);
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}
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EXPORT_SYMBOL(acpi_bus_set_power);
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/* --------------------------------------------------------------------------
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Event Management
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-------------------------------------------------------------------------- */
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static DEFINE_SPINLOCK(acpi_bus_event_lock);
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LIST_HEAD(acpi_bus_event_list);
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DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
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extern int event_is_open;
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int acpi_bus_generate_event(struct acpi_device *device, u8 type, int data)
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{
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struct acpi_bus_event *event = NULL;
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unsigned long flags = 0;
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ACPI_FUNCTION_TRACE("acpi_bus_generate_event");
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if (!device)
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return_VALUE(-EINVAL);
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/* drop event on the floor if no one's listening */
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if (!event_is_open)
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return_VALUE(0);
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event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
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if (!event)
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return_VALUE(-ENOMEM);
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strcpy(event->device_class, device->pnp.device_class);
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strcpy(event->bus_id, device->pnp.bus_id);
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event->type = type;
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event->data = data;
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spin_lock_irqsave(&acpi_bus_event_lock, flags);
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list_add_tail(&event->node, &acpi_bus_event_list);
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spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
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wake_up_interruptible(&acpi_bus_event_queue);
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return_VALUE(0);
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}
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EXPORT_SYMBOL(acpi_bus_generate_event);
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int acpi_bus_receive_event(struct acpi_bus_event *event)
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{
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unsigned long flags = 0;
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struct acpi_bus_event *entry = NULL;
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DECLARE_WAITQUEUE(wait, current);
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ACPI_FUNCTION_TRACE("acpi_bus_receive_event");
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if (!event)
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return_VALUE(-EINVAL);
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if (list_empty(&acpi_bus_event_list)) {
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&acpi_bus_event_queue, &wait);
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if (list_empty(&acpi_bus_event_list))
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schedule();
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remove_wait_queue(&acpi_bus_event_queue, &wait);
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set_current_state(TASK_RUNNING);
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if (signal_pending(current))
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return_VALUE(-ERESTARTSYS);
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}
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spin_lock_irqsave(&acpi_bus_event_lock, flags);
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entry =
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list_entry(acpi_bus_event_list.next, struct acpi_bus_event, node);
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if (entry)
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list_del(&entry->node);
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spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
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if (!entry)
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return_VALUE(-ENODEV);
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memcpy(event, entry, sizeof(struct acpi_bus_event));
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kfree(entry);
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return_VALUE(0);
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}
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EXPORT_SYMBOL(acpi_bus_receive_event);
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/* --------------------------------------------------------------------------
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Notification Handling
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-------------------------------------------------------------------------- */
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static int
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acpi_bus_check_device(struct acpi_device *device, int *status_changed)
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{
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acpi_status status = 0;
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struct acpi_device_status old_status;
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ACPI_FUNCTION_TRACE("acpi_bus_check_device");
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if (!device)
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return_VALUE(-EINVAL);
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if (status_changed)
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*status_changed = 0;
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old_status = device->status;
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/*
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* Make sure this device's parent is present before we go about
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* messing with the device.
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*/
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if (device->parent && !device->parent->status.present) {
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device->status = device->parent->status;
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if (STRUCT_TO_INT(old_status) != STRUCT_TO_INT(device->status)) {
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if (status_changed)
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*status_changed = 1;
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}
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return_VALUE(0);
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}
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status = acpi_bus_get_status(device);
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if (ACPI_FAILURE(status))
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return_VALUE(-ENODEV);
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if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
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return_VALUE(0);
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if (status_changed)
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*status_changed = 1;
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/*
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* Device Insertion/Removal
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*/
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if ((device->status.present) && !(old_status.present)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
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/* TBD: Handle device insertion */
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} else if (!(device->status.present) && (old_status.present)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
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/* TBD: Handle device removal */
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}
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return_VALUE(0);
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}
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static int acpi_bus_check_scope(struct acpi_device *device)
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{
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int result = 0;
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int status_changed = 0;
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ACPI_FUNCTION_TRACE("acpi_bus_check_scope");
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if (!device)
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return_VALUE(-EINVAL);
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/* Status Change? */
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result = acpi_bus_check_device(device, &status_changed);
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if (result)
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return_VALUE(result);
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if (!status_changed)
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return_VALUE(0);
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/*
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* TBD: Enumerate child devices within this device's scope and
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* run acpi_bus_check_device()'s on them.
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*/
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return_VALUE(0);
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}
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/**
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* acpi_bus_notify
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* ---------------
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* Callback for all 'system-level' device notifications (values 0x00-0x7F).
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*/
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static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
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{
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int result = 0;
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struct acpi_device *device = NULL;
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ACPI_FUNCTION_TRACE("acpi_bus_notify");
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if (acpi_bus_get_device(handle, &device))
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return_VOID;
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switch (type) {
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case ACPI_NOTIFY_BUS_CHECK:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received BUS CHECK notification for device [%s]\n",
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device->pnp.bus_id));
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result = acpi_bus_check_scope(device);
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/*
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* TBD: We'll need to outsource certain events to non-ACPI
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* drivers via the device manager (device.c).
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*/
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break;
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case ACPI_NOTIFY_DEVICE_CHECK:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received DEVICE CHECK notification for device [%s]\n",
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device->pnp.bus_id));
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result = acpi_bus_check_device(device, NULL);
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/*
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* TBD: We'll need to outsource certain events to non-ACPI
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* drivers via the device manager (device.c).
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*/
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break;
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case ACPI_NOTIFY_DEVICE_WAKE:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received DEVICE WAKE notification for device [%s]\n",
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device->pnp.bus_id));
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/* TBD */
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break;
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case ACPI_NOTIFY_EJECT_REQUEST:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received EJECT REQUEST notification for device [%s]\n",
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device->pnp.bus_id));
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/* TBD */
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break;
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case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received DEVICE CHECK LIGHT notification for device [%s]\n",
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device->pnp.bus_id));
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/* TBD: Exactly what does 'light' mean? */
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break;
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case ACPI_NOTIFY_FREQUENCY_MISMATCH:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received FREQUENCY MISMATCH notification for device [%s]\n",
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device->pnp.bus_id));
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/* TBD */
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break;
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case ACPI_NOTIFY_BUS_MODE_MISMATCH:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received BUS MODE MISMATCH notification for device [%s]\n",
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device->pnp.bus_id));
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/* TBD */
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break;
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case ACPI_NOTIFY_POWER_FAULT:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received POWER FAULT notification for device [%s]\n",
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device->pnp.bus_id));
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/* TBD */
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Received unknown/unsupported notification [%08x]\n",
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type));
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break;
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}
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return_VOID;
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}
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/* --------------------------------------------------------------------------
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Initialization/Cleanup
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-------------------------------------------------------------------------- */
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static int __init acpi_bus_init_irq(void)
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{
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acpi_status status = AE_OK;
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union acpi_object arg = { ACPI_TYPE_INTEGER };
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struct acpi_object_list arg_list = { 1, &arg };
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char *message = NULL;
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ACPI_FUNCTION_TRACE("acpi_bus_init_irq");
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/*
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* Let the system know what interrupt model we are using by
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* evaluating the \_PIC object, if exists.
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*/
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switch (acpi_irq_model) {
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case ACPI_IRQ_MODEL_PIC:
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message = "PIC";
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break;
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case ACPI_IRQ_MODEL_IOAPIC:
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message = "IOAPIC";
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break;
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case ACPI_IRQ_MODEL_IOSAPIC:
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message = "IOSAPIC";
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break;
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default:
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printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
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return_VALUE(-ENODEV);
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}
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printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
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arg.integer.value = acpi_irq_model;
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status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
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if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
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ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PIC\n"));
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return_VALUE(-ENODEV);
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}
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return_VALUE(0);
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}
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void __init acpi_early_init(void)
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{
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acpi_status status = AE_OK;
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struct acpi_buffer buffer = { sizeof(acpi_fadt), &acpi_fadt };
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ACPI_FUNCTION_TRACE("acpi_early_init");
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if (acpi_disabled)
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return_VOID;
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printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
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/* enable workarounds, unless strict ACPI spec. compliance */
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if (!acpi_strict)
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acpi_gbl_enable_interpreter_slack = TRUE;
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status = acpi_initialize_subsystem();
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX
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"Unable to initialize the ACPI Interpreter\n");
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goto error0;
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}
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status = acpi_load_tables();
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX
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"Unable to load the System Description Tables\n");
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goto error0;
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}
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/*
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* Get a separate copy of the FADT for use by other drivers.
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*/
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status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &buffer);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX "Unable to get the FADT\n");
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goto error0;
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}
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#ifdef CONFIG_X86
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if (!acpi_ioapic) {
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extern acpi_interrupt_flags acpi_sci_flags;
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/* compatible (0) means level (3) */
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if (acpi_sci_flags.trigger == 0)
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acpi_sci_flags.trigger = 3;
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/* Set PIC-mode SCI trigger type */
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acpi_pic_sci_set_trigger(acpi_fadt.sci_int,
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acpi_sci_flags.trigger);
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} else {
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extern int acpi_sci_override_gsi;
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/*
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* now that acpi_fadt is initialized,
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* update it with result from INT_SRC_OVR parsing
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*/
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acpi_fadt.sci_int = acpi_sci_override_gsi;
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}
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#endif
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status =
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acpi_enable_subsystem(~
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(ACPI_NO_HARDWARE_INIT |
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ACPI_NO_ACPI_ENABLE));
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
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goto error0;
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}
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return_VOID;
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error0:
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disable_acpi();
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return_VOID;
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}
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static int __init acpi_bus_init(void)
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{
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int result = 0;
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acpi_status status = AE_OK;
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extern acpi_status acpi_os_initialize1(void);
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ACPI_FUNCTION_TRACE("acpi_bus_init");
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status = acpi_os_initialize1();
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status =
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acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX
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"Unable to start the ACPI Interpreter\n");
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goto error1;
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}
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX
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"Unable to initialize ACPI OS objects\n");
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goto error1;
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}
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#ifdef CONFIG_ACPI_EC
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/*
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* ACPI 2.0 requires the EC driver to be loaded and work before
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* the EC device is found in the namespace (i.e. before acpi_initialize_objects()
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* is called).
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*
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* This is accomplished by looking for the ECDT table, and getting
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* the EC parameters out of that.
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*/
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status = acpi_ec_ecdt_probe();
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/* Ignore result. Not having an ECDT is not fatal. */
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#endif
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status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
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goto error1;
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}
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printk(KERN_INFO PREFIX "Interpreter enabled\n");
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/*
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* Get the system interrupt model and evaluate \_PIC.
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*/
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result = acpi_bus_init_irq();
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if (result)
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goto error1;
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/*
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* Register the for all standard device notifications.
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*/
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status =
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acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
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&acpi_bus_notify, NULL);
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if (ACPI_FAILURE(status)) {
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printk(KERN_ERR PREFIX
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"Unable to register for device notifications\n");
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goto error1;
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}
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/*
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* Create the top ACPI proc directory
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*/
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acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
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return_VALUE(0);
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/* Mimic structured exception handling */
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error1:
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acpi_terminate();
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return_VALUE(-ENODEV);
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}
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decl_subsys(acpi, NULL, NULL);
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static int __init acpi_init(void)
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{
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int result = 0;
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ACPI_FUNCTION_TRACE("acpi_init");
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if (acpi_disabled) {
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printk(KERN_INFO PREFIX "Interpreter disabled.\n");
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return_VALUE(-ENODEV);
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}
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firmware_register(&acpi_subsys);
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result = acpi_bus_init();
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if (!result) {
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#ifdef CONFIG_PM_LEGACY
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if (!PM_IS_ACTIVE())
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pm_active = 1;
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else {
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printk(KERN_INFO PREFIX
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"APM is already active, exiting\n");
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disable_acpi();
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result = -ENODEV;
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}
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#endif
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} else
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disable_acpi();
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return_VALUE(result);
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}
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subsys_initcall(acpi_init);
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