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341 lines
11 KiB
341 lines
11 KiB
/*
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* pm.h - Power management interface
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*
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* Copyright (C) 2000 Andrew Henroid
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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
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* (at 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_PM_H
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#define _LINUX_PM_H
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#ifdef __KERNEL__
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#include <linux/list.h>
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#include <asm/atomic.h>
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/*
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* Power management requests... these are passed to pm_send_all() and friends.
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*
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* these functions are old and deprecated, see below.
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*/
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typedef int __bitwise pm_request_t;
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#define PM_SUSPEND ((__force pm_request_t) 1) /* enter D1-D3 */
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#define PM_RESUME ((__force pm_request_t) 2) /* enter D0 */
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/*
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* Device types... these are passed to pm_register
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*/
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typedef int __bitwise pm_dev_t;
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#define PM_UNKNOWN_DEV ((__force pm_dev_t) 0) /* generic */
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#define PM_SYS_DEV ((__force pm_dev_t) 1) /* system device (fan, KB controller, ...) */
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#define PM_PCI_DEV ((__force pm_dev_t) 2) /* PCI device */
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#define PM_USB_DEV ((__force pm_dev_t) 3) /* USB device */
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#define PM_SCSI_DEV ((__force pm_dev_t) 4) /* SCSI device */
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#define PM_ISA_DEV ((__force pm_dev_t) 5) /* ISA device */
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#define PM_MTD_DEV ((__force pm_dev_t) 6) /* Memory Technology Device */
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/*
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* System device hardware ID (PnP) values
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*/
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enum
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{
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PM_SYS_UNKNOWN = 0x00000000, /* generic */
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PM_SYS_KBC = 0x41d00303, /* keyboard controller */
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PM_SYS_COM = 0x41d00500, /* serial port */
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PM_SYS_IRDA = 0x41d00510, /* IRDA controller */
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PM_SYS_FDC = 0x41d00700, /* floppy controller */
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PM_SYS_VGA = 0x41d00900, /* VGA controller */
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PM_SYS_PCMCIA = 0x41d00e00, /* PCMCIA controller */
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};
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/*
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* Device identifier
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*/
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#define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn)
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/*
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* Request handler callback
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*/
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struct pm_dev;
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typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data);
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/*
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* Dynamic device information
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*/
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struct pm_dev
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{
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pm_dev_t type;
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unsigned long id;
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pm_callback callback;
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void *data;
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unsigned long flags;
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unsigned long state;
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unsigned long prev_state;
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struct list_head entry;
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};
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/* Functions above this comment are list-based old-style power
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* managment. Please avoid using them. */
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/*
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* Callbacks for platform drivers to implement.
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*/
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extern void (*pm_idle)(void);
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extern void (*pm_power_off)(void);
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extern void (*pm_power_off_prepare)(void);
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typedef int __bitwise suspend_state_t;
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#define PM_SUSPEND_ON ((__force suspend_state_t) 0)
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#define PM_SUSPEND_STANDBY ((__force suspend_state_t) 1)
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#define PM_SUSPEND_MEM ((__force suspend_state_t) 3)
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#define PM_SUSPEND_MAX ((__force suspend_state_t) 4)
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/**
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* struct pm_ops - Callbacks for managing platform dependent system sleep
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* states.
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*
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* @valid: Callback to determine if given system sleep state is supported by
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* the platform.
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* Valid (ie. supported) states are advertised in /sys/power/state. Note
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* that it still may be impossible to enter given system sleep state if the
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* conditions aren't right.
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* There is the %pm_valid_only_mem function available that can be assigned
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* to this if the platform only supports mem sleep.
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*
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* @set_target: Tell the platform which system sleep state is going to be
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* entered.
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* @set_target() is executed right prior to suspending devices. The
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* information conveyed to the platform code by @set_target() should be
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* disregarded by the platform as soon as @finish() is executed and if
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* @prepare() fails. If @set_target() fails (ie. returns nonzero),
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* @prepare(), @enter() and @finish() will not be called by the PM core.
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* This callback is optional. However, if it is implemented, the argument
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* passed to @prepare(), @enter() and @finish() is meaningless and should
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* be ignored.
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*
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* @prepare: Prepare the platform for entering the system sleep state indicated
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* by @set_target() or represented by the argument if @set_target() is not
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* implemented.
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* @prepare() is called right after devices have been suspended (ie. the
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* appropriate .suspend() method has been executed for each device) and
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* before the nonboot CPUs are disabled (it is executed with IRQs enabled).
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* This callback is optional. It returns 0 on success or a negative
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* error code otherwise, in which case the system cannot enter the desired
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* sleep state (@enter() and @finish() will not be called in that case).
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*
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* @enter: Enter the system sleep state indicated by @set_target() or
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* represented by the argument if @set_target() is not implemented.
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* This callback is mandatory. It returns 0 on success or a negative
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* error code otherwise, in which case the system cannot enter the desired
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* sleep state.
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*
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* @finish: Called when the system has just left a sleep state, right after
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* the nonboot CPUs have been enabled and before devices are resumed (it is
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* executed with IRQs enabled). If @set_target() is not implemented, the
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* argument represents the sleep state being left.
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* This callback is optional, but should be implemented by the platforms
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* that implement @prepare(). If implemented, it is always called after
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* @enter() (even if @enter() fails).
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*/
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struct pm_ops {
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int (*valid)(suspend_state_t state);
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int (*set_target)(suspend_state_t state);
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int (*prepare)(suspend_state_t state);
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int (*enter)(suspend_state_t state);
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int (*finish)(suspend_state_t state);
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};
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extern struct pm_ops *pm_ops;
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/**
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* pm_set_ops - set platform dependent power management ops
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* @pm_ops: The new power management operations to set.
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*/
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extern void pm_set_ops(struct pm_ops *pm_ops);
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extern int pm_valid_only_mem(suspend_state_t state);
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/**
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* arch_suspend_disable_irqs - disable IRQs for suspend
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*
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* Disables IRQs (in the default case). This is a weak symbol in the common
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* code and thus allows architectures to override it if more needs to be
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* done. Not called for suspend to disk.
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*/
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extern void arch_suspend_disable_irqs(void);
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/**
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* arch_suspend_enable_irqs - enable IRQs after suspend
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*
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* Enables IRQs (in the default case). This is a weak symbol in the common
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* code and thus allows architectures to override it if more needs to be
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* done. Not called for suspend to disk.
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*/
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extern void arch_suspend_enable_irqs(void);
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extern int pm_suspend(suspend_state_t state);
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/*
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* Device power management
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*/
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struct device;
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typedef struct pm_message {
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int event;
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} pm_message_t;
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/*
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* Several driver power state transitions are externally visible, affecting
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* the state of pending I/O queues and (for drivers that touch hardware)
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* interrupts, wakeups, DMA, and other hardware state. There may also be
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* internal transitions to various low power modes, which are transparent
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* to the rest of the driver stack (such as a driver that's ON gating off
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* clocks which are not in active use).
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*
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* One transition is triggered by resume(), after a suspend() call; the
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* message is implicit:
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*
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* ON Driver starts working again, responding to hardware events
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* and software requests. The hardware may have gone through
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* a power-off reset, or it may have maintained state from the
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* previous suspend() which the driver will rely on while
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* resuming. On most platforms, there are no restrictions on
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* availability of resources like clocks during resume().
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*
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* Other transitions are triggered by messages sent using suspend(). All
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* these transitions quiesce the driver, so that I/O queues are inactive.
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* That commonly entails turning off IRQs and DMA; there may be rules
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* about how to quiesce that are specific to the bus or the device's type.
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* (For example, network drivers mark the link state.) Other details may
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* differ according to the message:
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*
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* SUSPEND Quiesce, enter a low power device state appropriate for
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* the upcoming system state (such as PCI_D3hot), and enable
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* wakeup events as appropriate.
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*
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* FREEZE Quiesce operations so that a consistent image can be saved;
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* but do NOT otherwise enter a low power device state, and do
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* NOT emit system wakeup events.
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*
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* PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
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* the system from a snapshot taken after an earlier FREEZE.
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* Some drivers will need to reset their hardware state instead
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* of preserving it, to ensure that it's never mistaken for the
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* state which that earlier snapshot had set up.
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*
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* A minimally power-aware driver treats all messages as SUSPEND, fully
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* reinitializes its device during resume() -- whether or not it was reset
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* during the suspend/resume cycle -- and can't issue wakeup events.
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*
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* More power-aware drivers may also use low power states at runtime as
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* well as during system sleep states like PM_SUSPEND_STANDBY. They may
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* be able to use wakeup events to exit from runtime low-power states,
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* or from system low-power states such as standby or suspend-to-RAM.
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*/
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#define PM_EVENT_ON 0
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#define PM_EVENT_FREEZE 1
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#define PM_EVENT_SUSPEND 2
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#define PM_EVENT_PRETHAW 3
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#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
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#define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
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#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
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#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
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struct dev_pm_info {
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pm_message_t power_state;
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unsigned can_wakeup:1;
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#ifdef CONFIG_PM
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unsigned should_wakeup:1;
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struct list_head entry;
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#endif
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};
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extern int device_power_down(pm_message_t state);
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extern void device_power_up(void);
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extern void device_resume(void);
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#ifdef CONFIG_PM
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extern int device_suspend(pm_message_t state);
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extern int device_prepare_suspend(pm_message_t state);
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#define device_set_wakeup_enable(dev,val) \
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((dev)->power.should_wakeup = !!(val))
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#define device_may_wakeup(dev) \
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(device_can_wakeup(dev) && (dev)->power.should_wakeup)
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extern void __suspend_report_result(const char *function, void *fn, int ret);
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#define suspend_report_result(fn, ret) \
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do { \
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__suspend_report_result(__FUNCTION__, fn, ret); \
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} while (0)
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/*
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* Platform hook to activate device wakeup capability, if that's not already
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* handled by enable_irq_wake() etc.
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* Returns zero on success, else negative errno
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*/
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extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
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static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
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{
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if (platform_enable_wakeup)
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return (*platform_enable_wakeup)(dev, is_on);
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return 0;
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}
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#else /* !CONFIG_PM */
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static inline int device_suspend(pm_message_t state)
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{
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return 0;
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}
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#define device_set_wakeup_enable(dev,val) do{}while(0)
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#define device_may_wakeup(dev) (0)
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#define suspend_report_result(fn, ret) do { } while (0)
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static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
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{
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return 0;
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}
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#endif
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/* changes to device_may_wakeup take effect on the next pm state change.
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* by default, devices should wakeup if they can.
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*/
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#define device_can_wakeup(dev) \
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((dev)->power.can_wakeup)
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#define device_init_wakeup(dev,val) \
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do { \
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device_can_wakeup(dev) = !!(val); \
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device_set_wakeup_enable(dev,val); \
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} while(0)
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#endif /* __KERNEL__ */
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#endif /* _LINUX_PM_H */
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