19c38de88a
A number of different drivers incorrect access the kobject name field directly. This is not correct as the name might not be in the array. Use the proper accessor function instead.
779 lines
19 KiB
C
779 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/kernel.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("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 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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if (!device)
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return -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_INFO, "No context for object [%p]\n",
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handle));
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return -ENODEV;
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}
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return 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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if (!device)
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return -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 -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) =
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ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
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ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING;
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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 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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result = acpi_bus_get_device(handle, &device);
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if (result)
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return 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 -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 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 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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result = acpi_bus_get_device(handle, &device);
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if (result)
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return result;
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if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
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return -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_INFO, "Device `[%s]' is not power manageable\n",
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kobject_name(&device->dev.kobj)));
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return -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) || device->flags.force_power_state)
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acpi_bus_get_power(device->handle, &device->power.state);
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if ((state == device->power.state) && !device->flags.force_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 0;
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}
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if (!device->power.states[state].flags.valid) {
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printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
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return -ENODEV;
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}
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if (device->parent && (state < device->parent->power.state)) {
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printk(KERN_WARNING PREFIX
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"Cannot set device to a higher-powered"
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" state than parent\n");
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return -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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printk(KERN_WARNING PREFIX
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"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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device->power.state = state;
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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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}
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return 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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#ifdef CONFIG_ACPI_PROC_EVENT
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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_proc_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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if (!device)
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return -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 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 -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 0;
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}
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EXPORT_SYMBOL(acpi_bus_generate_proc_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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if (!event)
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return -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 -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 -ENODEV;
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memcpy(event, entry, sizeof(struct acpi_bus_event));
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kfree(entry);
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return 0;
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}
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EXPORT_SYMBOL(acpi_bus_receive_event);
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#endif /* CONFIG_ACPI_PROC_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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if (!device)
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return -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 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 -ENODEV;
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if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
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return 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 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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if (!device)
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return -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 result;
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if (!status_changed)
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return 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 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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if (acpi_bus_get_device(handle, &device))
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return;
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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;
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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 };
|
|
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;
|
|
}
|
|
|
|
acpi_native_uint 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) {
|
|
extern u8 acpi_sci_flags;
|
|
|
|
/* 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 {
|
|
extern int acpi_sci_override_gsi;
|
|
/*
|
|
* 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);
|
|
|
|
|
|
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");
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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);
|