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 typedef int __bitwise suspend_state_t;
 108
 109 #define PM_SUSPEND_ON           ((__force suspend_state_t) 0)
 110 #define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 1)
 111 #define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)
 112 #define PM_SUSPEND_MAX          ((__force suspend_state_t) 4)
 113
 114 /**
 115  * struct pm_ops - Callbacks for managing platform dependent system sleep
 116  *      states.
 117  *
 118  * @valid: Callback to determine if given system sleep state is supported by
 119  *      the platform.
 120  *      Valid (ie. supported) states are advertised in /sys/power/state.  Note
 121  *      that it still may be impossible to enter given system sleep state if the
 122  *      conditions aren't right.
 123  *      There is the %pm_valid_only_mem function available that can be assigned
 124  *      to this if the platform only supports mem sleep.
 125  *
 126  * @set_target: Tell the platform which system sleep state is going to be
 127  *      entered.
 128  *      @set_target() is executed right prior to suspending devices.  The
 129  *      information conveyed to the platform code by @set_target() should be
 130  *      disregarded by the platform as soon as @finish() is executed and if
 131  *      @prepare() fails.  If @set_target() fails (ie. returns nonzero),
 132  *      @prepare(), @enter() and @finish() will not be called by the PM core.
 133  *      This callback is optional.  However, if it is implemented, the argument
 134  *      passed to @prepare(), @enter() and @finish() is meaningless and should
 135  *      be ignored.
 136  *
 137  * @prepare: Prepare the platform for entering the system sleep state indicated
 138  *      by @set_target() or represented by the argument if @set_target() is not
 139  *      implemented.
 140  *      @prepare() is called right after devices have been suspended (ie. the
 141  *      appropriate .suspend() method has been executed for each device) and
 142  *      before the nonboot CPUs are disabled (it is executed with IRQs enabled).
 143  *      This callback is optional.  It returns 0 on success or a negative
 144  *      error code otherwise, in which case the system cannot enter the desired
 145  *      sleep state (@enter() and @finish() will not be called in that case).
 146  *
 147  * @enter: Enter the system sleep state indicated by @set_target() or
 148  *      represented by the argument if @set_target() is not implemented.
 149  *      This callback is mandatory.  It returns 0 on success or a negative
 150  *      error code otherwise, in which case the system cannot enter the desired
 151  *      sleep state.
 152  *
 153  * @finish: Called when the system has just left a sleep state, right after
 154  *      the nonboot CPUs have been enabled and before devices are resumed (it is
 155  *      executed with IRQs enabled).  If @set_target() is not implemented, the
 156  *      argument represents the sleep state being left.
 157  *      This callback is optional, but should be implemented by the platforms
 158  *      that implement @prepare().  If implemented, it is always called after
 159  *      @enter() (even if @enter() fails).
 160  */
 161 struct pm_ops {
 162         int (*valid)(suspend_state_t state);
 163         int (*set_target)(suspend_state_t state);
 164         int (*prepare)(suspend_state_t state);
 165         int (*enter)(suspend_state_t state);
 166         int (*finish)(suspend_state_t state);
 167 };
 168
 169 #ifdef CONFIG_SUSPEND
 170 extern struct pm_ops *pm_ops;
 171
 172 /**
 173  * pm_set_ops - set platform dependent power management ops
 174  * @pm_ops: The new power management operations to set.
 175  */
 176 extern void pm_set_ops(struct pm_ops *pm_ops);
 177 extern int pm_valid_only_mem(suspend_state_t state);
 178
 179 /**
 180  * arch_suspend_disable_irqs - disable IRQs for suspend
 181  *
 182  * Disables IRQs (in the default case). This is a weak symbol in the common
 183  * code and thus allows architectures to override it if more needs to be
 184  * done. Not called for suspend to disk.
 185  */
 186 extern void arch_suspend_disable_irqs(void);
 187
 188 /**
 189  * arch_suspend_enable_irqs - enable IRQs after suspend
 190  *
 191  * Enables IRQs (in the default case). This is a weak symbol in the common
 192  * code and thus allows architectures to override it if more needs to be
 193  * done. Not called for suspend to disk.
 194  */
 195 extern void arch_suspend_enable_irqs(void);
 196
 197 extern int pm_suspend(suspend_state_t state);
 198 #else /* !CONFIG_SUSPEND */
 199 #define suspend_valid_only_mem  NULL
 200
 201 static inline void pm_set_ops(struct pm_ops *pm_ops) {}
 202 static inline int pm_suspend(suspend_state_t state) { return -ENOSYS; }
 203 #endif /* !CONFIG_SUSPEND */
 204
 205 /*
 206  * Device power management
 207  */
 208
 209 struct device;
 210
 211 typedef struct pm_message {
 212         int event;
 213 } pm_message_t;
 214
 215 /*
 216  * Several driver power state transitions are externally visible, affecting
 217  * the state of pending I/O queues and (for drivers that touch hardware)
 218  * interrupts, wakeups, DMA, and other hardware state.  There may also be
 219  * internal transitions to various low power modes, which are transparent
 220  * to the rest of the driver stack (such as a driver that's ON gating off
 221  * clocks which are not in active use).
 222  *
 223  * One transition is triggered by resume(), after a suspend() call; the
 224  * message is implicit:
 225  *
 226  * ON           Driver starts working again, responding to hardware events
 227  *              and software requests.  The hardware may have gone through
 228  *              a power-off reset, or it may have maintained state from the
 229  *              previous suspend() which the driver will rely on while
 230  *              resuming.  On most platforms, there are no restrictions on
 231  *              availability of resources like clocks during resume().
 232  *
 233  * Other transitions are triggered by messages sent using suspend().  All
 234  * these transitions quiesce the driver, so that I/O queues are inactive.
 235  * That commonly entails turning off IRQs and DMA; there may be rules
 236  * about how to quiesce that are specific to the bus or the device's type.
 237  * (For example, network drivers mark the link state.)  Other details may
 238  * differ according to the message:
 239  *
 240  * SUSPEND      Quiesce, enter a low power device state appropriate for
 241  *              the upcoming system state (such as PCI_D3hot), and enable
 242  *              wakeup events as appropriate.
 243  *
 244  * FREEZE       Quiesce operations so that a consistent image can be saved;
 245  *              but do NOT otherwise enter a low power device state, and do
 246  *              NOT emit system wakeup events.
 247  *
 248  * PRETHAW      Quiesce as if for FREEZE; additionally, prepare for restoring
 249  *              the system from a snapshot taken after an earlier FREEZE.
 250  *              Some drivers will need to reset their hardware state instead
 251  *              of preserving it, to ensure that it's never mistaken for the
 252  *              state which that earlier snapshot had set up.
 253  *
 254  * A minimally power-aware driver treats all messages as SUSPEND, fully
 255  * reinitializes its device during resume() -- whether or not it was reset
 256  * during the suspend/resume cycle -- and can't issue wakeup events.
 257  *
 258  * More power-aware drivers may also use low power states at runtime as
 259  * well as during system sleep states like PM_SUSPEND_STANDBY.  They may
 260  * be able to use wakeup events to exit from runtime low-power states,
 261  * or from system low-power states such as standby or suspend-to-RAM.
 262  */
 263
 264 #define PM_EVENT_ON 0
 265 #define PM_EVENT_FREEZE 1
 266 #define PM_EVENT_SUSPEND 2
 267 #define PM_EVENT_PRETHAW 3
 268
 269 #define PMSG_FREEZE     ((struct pm_message){ .event = PM_EVENT_FREEZE, })
 270 #define PMSG_PRETHAW    ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
 271 #define PMSG_SUSPEND    ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
 272 #define PMSG_ON         ((struct pm_message){ .event = PM_EVENT_ON, })
 273
 274 struct dev_pm_info {
 275         pm_message_t            power_state;
 276         unsigned                can_wakeup:1;
 277 #ifdef  CONFIG_PM_SLEEP
 278         unsigned                should_wakeup:1;
 279         struct list_head        entry;
 280 #endif
 281 };
 282
 283 extern int device_power_down(pm_message_t state);
 284 extern void device_power_up(void);
 285 extern void device_resume(void);
 286
 287 #ifdef CONFIG_PM_SLEEP
 288 extern int device_suspend(pm_message_t state);
 289 extern int device_prepare_suspend(pm_message_t state);
 290
 291 #define device_set_wakeup_enable(dev,val) \
 292         ((dev)->power.should_wakeup = !!(val))
 293 #define device_may_wakeup(dev) \
 294         (device_can_wakeup(dev) && (dev)->power.should_wakeup)
 295
 296 extern void __suspend_report_result(const char *function, void *fn, int ret);
 297
 298 #define suspend_report_result(fn, ret)                                  \
 299         do {                                                            \
 300                 __suspend_report_result(__FUNCTION__, fn, ret);         \
 301         } while (0)
 302
 303 /*
 304  * Platform hook to activate device wakeup capability, if that's not already
 305  * handled by enable_irq_wake() etc.
 306  * Returns zero on success, else negative errno
 307  */
 308 extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
 309
 310 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
 311 {
 312         if (platform_enable_wakeup)
 313                 return (*platform_enable_wakeup)(dev, is_on);
 314         return 0;
 315 }
 316
 317 #else /* !CONFIG_PM_SLEEP */
 318
 319 static inline int device_suspend(pm_message_t state)
 320 {
 321         return 0;
 322 }
 323
 324 #define device_set_wakeup_enable(dev,val)       do{}while(0)
 325 #define device_may_wakeup(dev)                  (0)
 326
 327 #define suspend_report_result(fn, ret) do { } while (0)
 328
 329 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
 330 {
 331         return 0;
 332 }
 333
 334 #endif /* !CONFIG_PM_SLEEP */
 335
 336 /* changes to device_may_wakeup take effect on the next pm state change.
 337  * by default, devices should wakeup if they can.
 338  */
 339 #define device_can_wakeup(dev) \
 340         ((dev)->power.can_wakeup)
 341 #define device_init_wakeup(dev,val) \
 342         do { \
 343                 device_can_wakeup(dev) = !!(val); \
 344                 device_set_wakeup_enable(dev,val); \
 345         } while(0)
 346
 347 #endif /* __KERNEL__ */
 348
 349 #endif /* _LINUX_PM_H */