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* pm.h - Power management interface
* Copyright (C) 2000 Andrew Henroid
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef _LINUX_PM_H
#define _LINUX_PM_H
#ifdef __KERNEL__
#include <linux/list.h>
#include <asm/atomic.h>
#include <asm/errno.h>
* Power management requests... these are passed to pm_send_all() and friends.
* these functions are old and deprecated, see below.
typedef int __bitwise pm_request_t;
#define PM_SUSPEND ((__force pm_request_t) 1) /* enter D1-D3 */
#define PM_RESUME ((__force pm_request_t) 2) /* enter D0 */
* Device types... these are passed to pm_register
typedef int __bitwise pm_dev_t;
#define PM_UNKNOWN_DEV ((__force pm_dev_t) 0) /* generic */
#define PM_SYS_DEV ((__force pm_dev_t) 1) /* system device (fan, KB controller, ...) */
#define PM_PCI_DEV ((__force pm_dev_t) 2) /* PCI device */
#define PM_USB_DEV ((__force pm_dev_t) 3) /* USB device */
#define PM_SCSI_DEV ((__force pm_dev_t) 4) /* SCSI device */
#define PM_ISA_DEV ((__force pm_dev_t) 5) /* ISA device */
#define PM_MTD_DEV ((__force pm_dev_t) 6) /* Memory Technology Device */
* System device hardware ID (PnP) values
PM_SYS_UNKNOWN = 0x00000000, /* generic */
PM_SYS_KBC = 0x41d00303, /* keyboard controller */
PM_SYS_COM = 0x41d00500, /* serial port */
PM_SYS_IRDA = 0x41d00510, /* IRDA controller */
PM_SYS_FDC = 0x41d00700, /* floppy controller */
PM_SYS_VGA = 0x41d00900, /* VGA controller */
PM_SYS_PCMCIA = 0x41d00e00, /* PCMCIA controller */
* Device identifier
#define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn)
* Request handler callback
struct pm_dev;
typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data);
* Dynamic device information
struct pm_dev
pm_dev_t type;
unsigned long id;
pm_callback callback;
void *data;
unsigned long flags;
unsigned long state;
unsigned long prev_state;
struct list_head entry;
/* Functions above this comment are list-based old-style power
* management. Please avoid using them. */
* Callbacks for platform drivers to implement.
extern void (*pm_idle)(void);
extern void (*pm_power_off)(void);
extern void (*pm_power_off_prepare)(void);
* Device power management
struct device;
typedef struct pm_message {
int event;
} pm_message_t;
* Several driver power state transitions are externally visible, affecting
* the state of pending I/O queues and (for drivers that touch hardware)
* interrupts, wakeups, DMA, and other hardware state. There may also be
* internal transitions to various low power modes, which are transparent
* to the rest of the driver stack (such as a driver that's ON gating off
* clocks which are not in active use).
* One transition is triggered by resume(), after a suspend() call; the
* message is implicit:
* ON Driver starts working again, responding to hardware events
* and software requests. The hardware may have gone through
* a power-off reset, or it may have maintained state from the
* previous suspend() which the driver will rely on while
* resuming. On most platforms, there are no restrictions on
* availability of resources like clocks during resume().
* Other transitions are triggered by messages sent using suspend(). All
* these transitions quiesce the driver, so that I/O queues are inactive.
* That commonly entails turning off IRQs and DMA; there may be rules
* about how to quiesce that are specific to the bus or the device's type.
* (For example, network drivers mark the link state.) Other details may
* differ according to the message:
* SUSPEND Quiesce, enter a low power device state appropriate for
* the upcoming system state (such as PCI_D3hot), and enable
* wakeup events as appropriate.
* HIBERNATE Enter a low power device state appropriate for the hibernation
* state (eg. ACPI S4) and enable wakeup events as appropriate.
* FREEZE Quiesce operations so that a consistent image can be saved;
* but do NOT otherwise enter a low power device state, and do
* NOT emit system wakeup events.
* PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
* the system from a snapshot taken after an earlier FREEZE.
* Some drivers will need to reset their hardware state instead
* of preserving it, to ensure that it's never mistaken for the
* state which that earlier snapshot had set up.
* A minimally power-aware driver treats all messages as SUSPEND, fully
* reinitializes its device during resume() -- whether or not it was reset
* during the suspend/resume cycle -- and can't issue wakeup events.
* More power-aware drivers may also use low power states at runtime as
* well as during system sleep states like PM_SUSPEND_STANDBY. They may
* be able to use wakeup events to exit from runtime low-power states,
* or from system low-power states such as standby or suspend-to-RAM.
#define PM_EVENT_ON 0
#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
#define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
struct dev_pm_info {
pm_message_t power_state;
unsigned can_wakeup:1;
unsigned should_wakeup:1;
struct list_head entry;
extern int device_power_down(pm_message_t state);
extern void device_power_up(void);
extern void device_resume(void);
extern int device_suspend(pm_message_t state);
extern int device_prepare_suspend(pm_message_t state);
#define device_set_wakeup_enable(dev,val) \
((dev)->power.should_wakeup = !!(val))
#define device_may_wakeup(dev) \
(device_can_wakeup(dev) && (dev)->power.should_wakeup)
extern void __suspend_report_result(const char *function, void *fn, int ret);
#define suspend_report_result(fn, ret) \
do { \
__suspend_report_result(__FUNCTION__, fn, ret); \
} while (0)
* Platform hook to activate device wakeup capability, if that's not already
* handled by enable_irq_wake() etc.
* Returns zero on success, else negative errno
extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
if (platform_enable_wakeup)
return (*platform_enable_wakeup)(dev, is_on);
return 0;
#else /* !CONFIG_PM_SLEEP */
static inline int device_suspend(pm_message_t state)
return 0;
#define device_set_wakeup_enable(dev,val) do{}while(0)
#define device_may_wakeup(dev) (0)
#define suspend_report_result(fn, ret) do { } while (0)
static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
return 0;
#endif /* !CONFIG_PM_SLEEP */
/* changes to device_may_wakeup take effect on the next pm state change.
* by default, devices should wakeup if they can.
#define device_can_wakeup(dev) \
#define device_init_wakeup(dev,val) \
do { \
device_can_wakeup(dev) = !!(val); \
device_set_wakeup_enable(dev,val); \
} while(0)
* Global Power Management flags
* Used to keep APM and ACPI from both being active
extern unsigned int pm_flags;
#define PM_APM 1
#define PM_ACPI 2
#endif /* __KERNEL__ */
#endif /* _LINUX_PM_H */