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
  29 /*
  30  * Power management requests... these are passed to pm_send_all() and friends.
  31  *
  32  * these functions are old and deprecated, see below.
  33  */
  34 typedef int __bitwise pm_request_t;
  35
  36 #define PM_SUSPEND      ((__force pm_request_t) 1)      /* enter D1-D3 */
  37 #define PM_RESUME       ((__force pm_request_t) 2)      /* enter D0 */
  38
  39
  40 /*
  41  * Device types... these are passed to pm_register
  42  */
  43 typedef int __bitwise pm_dev_t;
  44
  45 #define PM_UNKNOWN_DEV  ((__force pm_dev_t) 0)  /* generic */
  46 #define PM_SYS_DEV      ((__force pm_dev_t) 1)  /* system device (fan, KB controller, ...) */
  47 #define PM_PCI_DEV      ((__force pm_dev_t) 2)  /* PCI device */
  48 #define PM_USB_DEV      ((__force pm_dev_t) 3)  /* USB device */
  49 #define PM_SCSI_DEV     ((__force pm_dev_t) 4)  /* SCSI device */
  50 #define PM_ISA_DEV      ((__force pm_dev_t) 5)  /* ISA device */
  51 #define PM_MTD_DEV      ((__force pm_dev_t) 6)  /* Memory Technology Device */
  52
  53 /*
  54  * System device hardware ID (PnP) values
  55  */
  56 enum
  57 {
  58         PM_SYS_UNKNOWN = 0x00000000, /* generic */
  59         PM_SYS_KBC =     0x41d00303, /* keyboard controller */
  60         PM_SYS_COM =     0x41d00500, /* serial port */
  61         PM_SYS_IRDA =    0x41d00510, /* IRDA controller */
  62         PM_SYS_FDC =     0x41d00700, /* floppy controller */
  63         PM_SYS_VGA =     0x41d00900, /* VGA controller */
  64         PM_SYS_PCMCIA =  0x41d00e00, /* PCMCIA controller */
  65 };
  66
  67 /*
  68  * Device identifier
  69  */
  70 #define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn)
  71
  72 /*
  73  * Request handler callback
  74  */
  75 struct pm_dev;
  76
  77 typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data);
  78
  79 /*
  80  * Dynamic device information
  81  */
  82 struct pm_dev
  83 {
  84         pm_dev_t         type;
  85         unsigned long    id;
  86         pm_callback      callback;
  87         void            *data;
  88
  89         unsigned long    flags;
  90         unsigned long    state;
  91         unsigned long    prev_state;
  92
  93         struct list_head entry;
  94 };
  95
  96 /* Functions above this comment are list-based old-style power
  97  * managment. Please avoid using them.  */
  98
  99 /*
 100  * Callbacks for platform drivers to implement.
 101  */
 102 extern void (*pm_idle)(void);
 103 extern void (*pm_power_off)(void);
 104
 105 typedef int __bitwise suspend_state_t;
 106
 107 #define PM_SUSPEND_ON           ((__force suspend_state_t) 0)
 108 #define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 1)
 109 #define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)
 110 #define PM_SUSPEND_DISK         ((__force suspend_state_t) 4)
 111 #define PM_SUSPEND_MAX          ((__force suspend_state_t) 5)
 112
 113 typedef int __bitwise suspend_disk_method_t;
 114
 115 /* invalid must be 0 so struct pm_ops initialisers can leave it out */
 116 #define PM_DISK_INVALID         ((__force suspend_disk_method_t) 0)
 117 #define PM_DISK_PLATFORM        ((__force suspend_disk_method_t) 1)
 118 #define PM_DISK_SHUTDOWN        ((__force suspend_disk_method_t) 2)
 119 #define PM_DISK_REBOOT          ((__force suspend_disk_method_t) 3)
 120 #define PM_DISK_TEST            ((__force suspend_disk_method_t) 4)
 121 #define PM_DISK_TESTPROC        ((__force suspend_disk_method_t) 5)
 122 #define PM_DISK_MAX             ((__force suspend_disk_method_t) 6)
 123
 124 /**
 125  * struct pm_ops - Callbacks for managing platform dependent suspend states.
 126  * @valid: Callback to determine whether the given state can be entered.
 127  *      If %CONFIG_SOFTWARE_SUSPEND is set then %PM_SUSPEND_DISK is
 128  *      always valid and never passed to this call. If not assigned,
 129  *      no suspend states are valid.
 130  *      Valid states are advertised in /sys/power/state but can still
 131  *      be rejected by prepare or enter if the conditions aren't right.
 132  *      There is a %pm_valid_only_mem function available that can be assigned
 133  *      to this if you only implement mem sleep.
 134  *
 135  * @prepare: Prepare the platform for the given suspend state. Can return a
 136  *      negative error code if necessary.
 137  *
 138  * @enter: Enter the given suspend state, must be assigned. Can return a
 139  *      negative error code if necessary.
 140  *
 141  * @finish: Called when the system has left the given state and all devices
 142  *      are resumed. The return value is ignored.
 143  *
 144  * @pm_disk_mode: The generic code always allows one of the shutdown methods
 145  *      %PM_DISK_SHUTDOWN, %PM_DISK_REBOOT, %PM_DISK_TEST and
 146  *      %PM_DISK_TESTPROC. If this variable is set, the mode it is set
 147  *      to is allowed in addition to those modes and is also made default.
 148  *      When this mode is sent selected, the @prepare call will be called
 149  *      before suspending to disk (if present), the @enter call should be
 150  *      present and will be called after all state has been saved and the
 151  *      machine is ready to be powered off; the @finish callback is called
 152  *      after state has been restored. All these calls are called with
 153  *      %PM_SUSPEND_DISK as the state.
 154  */
 155 struct pm_ops {
 156         int (*valid)(suspend_state_t state);
 157         int (*prepare)(suspend_state_t state);
 158         int (*enter)(suspend_state_t state);
 159         int (*finish)(suspend_state_t state);
 160         suspend_disk_method_t pm_disk_mode;
 161 };
 162
 163 /**
 164  * pm_set_ops - set platform dependent power management ops
 165  * @pm_ops: The new power management operations to set.
 166  */
 167 extern void pm_set_ops(struct pm_ops *pm_ops);
 168 extern struct pm_ops *pm_ops;
 169 extern int pm_suspend(suspend_state_t state);
 170
 171 extern int pm_valid_only_mem(suspend_state_t state);
 172
 173 /**
 174  * arch_suspend_disable_irqs - disable IRQs for suspend
 175  *
 176  * Disables IRQs (in the default case). This is a weak symbol in the common
 177  * code and thus allows architectures to override it if more needs to be
 178  * done. Not called for suspend to disk.
 179  */
 180 extern void arch_suspend_disable_irqs(void);
 181
 182 /**
 183  * arch_suspend_enable_irqs - enable IRQs after suspend
 184  *
 185  * Enables IRQs (in the default case). This is a weak symbol in the common
 186  * code and thus allows architectures to override it if more needs to be
 187  * done. Not called for suspend to disk.
 188  */
 189 extern void arch_suspend_enable_irqs(void);
 190
 191 /*
 192  * Device power management
 193  */
 194
 195 struct device;
 196
 197 typedef struct pm_message {
 198         int event;
 199 } pm_message_t;
 200
 201 /*
 202  * Several driver power state transitions are externally visible, affecting
 203  * the state of pending I/O queues and (for drivers that touch hardware)
 204  * interrupts, wakeups, DMA, and other hardware state.  There may also be
 205  * internal transitions to various low power modes, which are transparent
 206  * to the rest of the driver stack (such as a driver that's ON gating off
 207  * clocks which are not in active use).
 208  *
 209  * One transition is triggered by resume(), after a suspend() call; the
 210  * message is implicit:
 211  *
 212  * ON           Driver starts working again, responding to hardware events
 213  *              and software requests.  The hardware may have gone through
 214  *              a power-off reset, or it may have maintained state from the
 215  *              previous suspend() which the driver will rely on while
 216  *              resuming.  On most platforms, there are no restrictions on
 217  *              availability of resources like clocks during resume().
 218  *
 219  * Other transitions are triggered by messages sent using suspend().  All
 220  * these transitions quiesce the driver, so that I/O queues are inactive.
 221  * That commonly entails turning off IRQs and DMA; there may be rules
 222  * about how to quiesce that are specific to the bus or the device's type.
 223  * (For example, network drivers mark the link state.)  Other details may
 224  * differ according to the message:
 225  *
 226  * SUSPEND      Quiesce, enter a low power device state appropriate for
 227  *              the upcoming system state (such as PCI_D3hot), and enable
 228  *              wakeup events as appropriate.
 229  *
 230  * FREEZE       Quiesce operations so that a consistent image can be saved;
 231  *              but do NOT otherwise enter a low power device state, and do
 232  *              NOT emit system wakeup events.
 233  *
 234  * PRETHAW      Quiesce as if for FREEZE; additionally, prepare for restoring
 235  *              the system from a snapshot taken after an earlier FREEZE.
 236  *              Some drivers will need to reset their hardware state instead
 237  *              of preserving it, to ensure that it's never mistaken for the
 238  *              state which that earlier snapshot had set up.
 239  *
 240  * A minimally power-aware driver treats all messages as SUSPEND, fully
 241  * reinitializes its device during resume() -- whether or not it was reset
 242  * during the suspend/resume cycle -- and can't issue wakeup events.
 243  *
 244  * More power-aware drivers may also use low power states at runtime as
 245  * well as during system sleep states like PM_SUSPEND_STANDBY.  They may
 246  * be able to use wakeup events to exit from runtime low-power states,
 247  * or from system low-power states such as standby or suspend-to-RAM.
 248  */
 249
 250 #define PM_EVENT_ON 0
 251 #define PM_EVENT_FREEZE 1
 252 #define PM_EVENT_SUSPEND 2
 253 #define PM_EVENT_PRETHAW 3
 254
 255 #define PMSG_FREEZE     ((struct pm_message){ .event = PM_EVENT_FREEZE, })
 256 #define PMSG_PRETHAW    ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
 257 #define PMSG_SUSPEND    ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
 258 #define PMSG_ON         ((struct pm_message){ .event = PM_EVENT_ON, })
 259
 260 struct dev_pm_info {
 261         pm_message_t            power_state;
 262         unsigned                can_wakeup:1;
 263 #ifdef  CONFIG_PM
 264         unsigned                should_wakeup:1;
 265         pm_message_t            prev_state;
 266         void                    * saved_state;
 267         struct device           * pm_parent;
 268         struct list_head        entry;
 269 #endif
 270 };
 271
 272 extern void device_pm_set_parent(struct device * dev, struct device * parent);
 273
 274 extern int device_power_down(pm_message_t state);
 275 extern void device_power_up(void);
 276 extern void device_resume(void);
 277
 278 #ifdef CONFIG_PM
 279 extern suspend_disk_method_t pm_disk_mode;
 280
 281 extern int device_suspend(pm_message_t state);
 282 extern int device_prepare_suspend(pm_message_t state);
 283
 284 #define device_set_wakeup_enable(dev,val) \
 285         ((dev)->power.should_wakeup = !!(val))
 286 #define device_may_wakeup(dev) \
 287         (device_can_wakeup(dev) && (dev)->power.should_wakeup)
 288
 289 extern int dpm_runtime_suspend(struct device *, pm_message_t);
 290 extern void dpm_runtime_resume(struct device *);
 291 extern void __suspend_report_result(const char *function, void *fn, int ret);
 292
 293 #define suspend_report_result(fn, ret)                                  \
 294         do {                                                            \
 295                 __suspend_report_result(__FUNCTION__, fn, ret);         \
 296         } while (0)
 297
 298 /*
 299  * Platform hook to activate device wakeup capability, if that's not already
 300  * handled by enable_irq_wake() etc.
 301  * Returns zero on success, else negative errno
 302  */
 303 extern int (*platform_enable_wakeup)(struct device *dev, int is_on);
 304
 305 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
 306 {
 307         if (platform_enable_wakeup)
 308                 return (*platform_enable_wakeup)(dev, is_on);
 309         return 0;
 310 }
 311
 312 #else /* !CONFIG_PM */
 313
 314 static inline int device_suspend(pm_message_t state)
 315 {
 316         return 0;
 317 }
 318
 319 #define device_set_wakeup_enable(dev,val)       do{}while(0)
 320 #define device_may_wakeup(dev)                  (0)
 321
 322 static inline int dpm_runtime_suspend(struct device * dev, pm_message_t state)
 323 {
 324         return 0;
 325 }
 326
 327 static inline void dpm_runtime_resume(struct device * dev)
 328 {
 329 }
 330
 331 #define suspend_report_result(fn, ret) do { } while (0)
 332
 333 static inline int call_platform_enable_wakeup(struct device *dev, int is_on)
 334 {
 335         return 0;
 336 }
 337
 338 #endif
 339
 340 /* changes to device_may_wakeup take effect on the next pm state change.
 341  * by default, devices should wakeup if they can.
 342  */
 343 #define device_can_wakeup(dev) \
 344         ((dev)->power.can_wakeup)
 345 #define device_init_wakeup(dev,val) \
 346         do { \
 347                 device_can_wakeup(dev) = !!(val); \
 348                 device_set_wakeup_enable(dev,val); \
 349         } while(0)
 350
 351 #endif /* __KERNEL__ */
 352
 353 #endif /* _LINUX_PM_H */