include/linux/pm.h

   1 /*
   2  *  pm.h - Power management interface
   3  *
   4  *  Copyright (C) 2000 Andrew Henroid
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef _LINUX_PM_H
  22 #define _LINUX_PM_H
  23
  24 #ifdef __KERNEL__
  25
  26 #include <linux/list.h>
  27 #include <asm/atomic.h>
  28 #include <asm/errno.h>
  29
  30 /*
  31  * Power management requests... these are passed to pm_send_all() and friends.
  32  *
  33  * these functions are old and deprecated, see below.
  34  */
  35 typedef int __bitwise pm_request_t;
  36
  37 #define PM_SUSPEND      ((__force pm_request_t) 1)      /* enter D1-D3 */
  38 #define PM_RESUME       ((__force pm_request_t) 2)      /* enter D0 */
  39
  40
  41 /*
  42  * Device types... these are passed to pm_register
  43  */
  44 typedef int __bitwise pm_dev_t;
  45
  46 #define PM_UNKNOWN_DEV  ((__force pm_dev_t) 0)  /* generic */
  47 #define PM_SYS_DEV      ((__force pm_dev_t) 1)  /* system device (fan, KB controller, ...) */
  48 #define PM_PCI_DEV      ((__force pm_dev_t) 2)  /* PCI device */
  49 #define PM_USB_DEV      ((__force pm_dev_t) 3)  /* USB device */
  50 #define PM_SCSI_DEV     ((__force pm_dev_t) 4)  /* SCSI device */
  51 #define PM_ISA_DEV      ((__force pm_dev_t) 5)  /* ISA device */
  52 #define PM_MTD_DEV      ((__force pm_dev_t) 6)  /* Memory Technology Device */
  53
  54 /*
  55  * System device hardware ID (PnP) values
  56  */
  57 enum
  58 {
  59         PM_SYS_UNKNOWN = 0x00000000, /* generic */
  60         PM_SYS_KBC =     0x41d00303, /* keyboard controller */
  61         PM_SYS_COM =     0x41d00500, /* serial port */
  62         PM_SYS_IRDA =    0x41d00510, /* IRDA controller */
  63         PM_SYS_FDC =     0x41d00700, /* floppy controller */
  64         PM_SYS_VGA =     0x41d00900, /* VGA controller */
  65         PM_SYS_PCMCIA =  0x41d00e00, /* PCMCIA controller */
  66 };
  67
  68 /*
  69  * Device identifier
  70  */
  71 #define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn)
  72
  73 /*
  74  * Request handler callback
  75  */
  76 struct pm_dev;
  77
  78 typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data);
  79
  80 /*
  81  * Dynamic device information
  82  */
  83 struct pm_dev
  84 {
  85         pm_dev_t         type;
  86         unsigned long    id;
  87         pm_callback      callback;
  88         void            *data;
  89
  90         unsigned long    flags;
  91         unsigned long    state;
  92         unsigned long    prev_state;
  93
  94         struct list_head entry;
  95 };
  96
  97 /* Functions above this comment are list-based old-style power
  98  * managment. Please avoid using them.  */
  99
 100 /*
 101  * Callbacks for platform drivers to implement.
 102  */
 103 extern void (*pm_idle)(void);
 104 extern void (*pm_power_off)(void);
 105 extern void (*pm_power_off_prepare)(void);
 106
 107 /*
 108  * Device power management
 109  */
 110
 111 struct device;
 112
 113 typedef struct pm_message {
 114         int event;
 115 } pm_message_t;
 116
 117 /*
 118  * Several driver power state transitions are externally visible, affecting
 119  * the state of pending I/O queues and (for drivers that touch hardware)
 120  * interrupts, wakeups, DMA, and other hardware state.  There may also be
 121  * internal transitions to various low power modes, which are transparent
 122  * to the rest of the driver stack (such as a driver that's ON gating off
 123  * clocks which are not in active use).
 124  *
 125  * One transition is triggered by resume(), after a suspend() call; the
 126  * message is implicit:
 127  *
 128  * ON           Driver starts working again, responding to hardware events
 129  *              and software requests.  The hardware may have gone through
 130  *              a power-off reset, or it may have maintained state from the
 131  *              previous suspend() which the driver will rely on while
 132  *              resuming.  On most platforms, there are no restrictions on
 133  *              availability of resources like clocks during resume().
 134  *
 135  * Other transitions are triggered by messages sent using suspend().  All
 136  * these transitions quiesce the driver, so that I/O queues are inactive.
 137  * That commonly entails turning off IRQs and DMA; there may be rules
 138  * about how to quiesce that are specific to the bus or the device's type.
 139  * (For example, network drivers mark the link state.)  Other details may
 140  * differ according to the message:
 141  *
 142  * SUSPEND      Quiesce, enter a low power device state appropriate for
 143  *              the upcoming system state (such as PCI_D3hot), and enable
 144  *              wakeup events as appropriate.
 145  *
 146  * FREEZE       Quiesce operations so that a consistent image can be saved;
 147  *              but do NOT otherwise enter a low power device state, and do
 148  *              NOT emit system wakeup events.
 149  *
 150  * PRETHAW      Quiesce as if for FREEZE; additionally, prepare for restoring
 151  *              the system from a snapshot taken after an earlier FREEZE.
 152  *              Some drivers will need to reset their hardware state instead
 153  *              of preserving it, to ensure that it's never mistaken for the
 154  *              state which that earlier snapshot had set up.
 155  *
 156  * A minimally power-aware driver treats all messages as SUSPEND, fully
 157  * reinitializes its device during resume() -- whether or not it was reset
 158  * during the suspend/resume cycle -- and can't issue wakeup events.
 159  *
 160  * More power-aware drivers may also use low power states at runtime as
 161  * well as during system sleep states like PM_SUSPEND_STANDBY.  They may
 162  * be able to use wakeup events to exit from runtime low-power states,
 163  * or from system low-power states such as standby or suspend-to-RAM.
 164  */
 165
 166 #define PM_EVENT_ON 0
 167 #define PM_EVENT_FREEZE 1
 168 #define PM_EVENT_SUSPEND 2
 169 #define PM_EVENT_PRETHAW 3
 170
 171 #define PMSG_FREEZE     ((struct pm_message){ .event = PM_EVENT_FREEZE, })
 172 #define PMSG_PRETHAW    ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
 173 #define PMSG_SUSPEND    ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
 174 #define PMSG_ON         ((struct pm_message){ .event = PM_EVENT_ON, })
 175
 176 struct dev_pm_info {
 177         pm_message_t            power_state;
 178         unsigned                can_wakeup:1;
 179 #ifdef  CONFIG_PM_SLEEP
 180         unsigned                should_wakeup:1;
 181         struct list_head        entry;
 182 #endif
 183 };
 184
 185 extern int device_power_down(pm_message_t state);
 186 extern void device_power_up(void);
 187 extern void device_resume(void);
 188
 189 #ifdef CONFIG_PM_SLEEP
 190 extern int device_suspend(pm_message_t state);
 191 extern int device_prepare_suspend(pm_message_t state);
 192
 193 #define device_set_wakeup_enable(dev,val) \
 194         ((dev)->power.should_wakeup = !!(val))
 195 #define device_may_wakeup(dev) \
 196         (device_can_wakeup(dev) && (dev)->power.should_wakeup)
 197
 198 extern void __suspend_report_result(const char *function, void *fn, int ret);
 199
 200 #define suspend_report_result(fn, ret)                                  \
 201         do {                                                            \
 202                 __suspend_report_result(__FUNCTION__, fn, ret);         \
 203         } while (0)
 204
 205 /*
 206  * Platform hook to activate device wakeup capability, if that's not already
 207  * handled by enable_irq_wake() etc.
 208  * Returns zero on success, else negative errno
 209  */
 210 extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
 211
 212 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
 213 {
 214         if (platform_enable_wakeup)
 215                 return (*platform_enable_wakeup)(dev, is_on);
 216         return 0;
 217 }
 218
 219 #else /* !CONFIG_PM_SLEEP */
 220
 221 static inline int device_suspend(pm_message_t state)
 222 {
 223         return 0;
 224 }
 225
 226 #define device_set_wakeup_enable(dev,val)       do{}while(0)
 227 #define device_may_wakeup(dev)                  (0)
 228
 229 #define suspend_report_result(fn, ret) do { } while (0)
 230
 231 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
 232 {
 233         return 0;
 234 }
 235
 236 #endif /* !CONFIG_PM_SLEEP */
 237
 238 /* changes to device_may_wakeup take effect on the next pm state change.
 239  * by default, devices should wakeup if they can.
 240  */
 241 #define device_can_wakeup(dev) \
 242         ((dev)->power.can_wakeup)
 243 #define device_init_wakeup(dev,val) \
 244         do { \
 245                 device_can_wakeup(dev) = !!(val); \
 246                 device_set_wakeup_enable(dev,val); \
 247         } while(0)
 248
 249 /*
 250  * Global Power Management flags
 251  * Used to keep APM and ACPI from both being active
 252  */
 253 extern unsigned int     pm_flags;
 254
 255 #define PM_APM  1
 256 #define PM_ACPI 2
 257
 258 #endif /* __KERNEL__ */
 259
 260 #endif /* _LINUX_PM_H */