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