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 #define PM_DISK_FIRMWARE        ((__force suspend_disk_method_t) 1)
 116 #define PM_DISK_PLATFORM        ((__force suspend_disk_method_t) 2)
 117 #define PM_DISK_SHUTDOWN        ((__force suspend_disk_method_t) 3)
 118 #define PM_DISK_REBOOT          ((__force suspend_disk_method_t) 4)
 119 #define PM_DISK_MAX             ((__force suspend_disk_method_t) 5)
 120
 121 struct pm_ops {
 122         suspend_disk_method_t pm_disk_mode;
 123         int (*valid)(suspend_state_t state);
 124         int (*prepare)(suspend_state_t state);
 125         int (*enter)(suspend_state_t state);
 126         int (*finish)(suspend_state_t state);
 127 };
 128
 129 extern void pm_set_ops(struct pm_ops *);
 130 extern struct pm_ops *pm_ops;
 131 extern int pm_suspend(suspend_state_t state);
 132
 133
 134 /*
 135  * Device power management
 136  */
 137
 138 struct device;
 139
 140 typedef struct pm_message {
 141         int event;
 142 } pm_message_t;
 143
 144 /*
 145  * Several driver power state transitions are externally visible, affecting
 146  * the state of pending I/O queues and (for drivers that touch hardware)
 147  * interrupts, wakeups, DMA, and other hardware state.  There may also be
 148  * internal transitions to various low power modes, which are transparent
 149  * to the rest of the driver stack (such as a driver that's ON gating off
 150  * clocks which are not in active use).
 151  *
 152  * One transition is triggered by resume(), after a suspend() call; the
 153  * message is implicit:
 154  *
 155  * ON           Driver starts working again, responding to hardware events
 156  *              and software requests.  The hardware may have gone through
 157  *              a power-off reset, or it may have maintained state from the
 158  *              previous suspend() which the driver will rely on while
 159  *              resuming.  On most platforms, there are no restrictions on
 160  *              availability of resources like clocks during resume().
 161  *
 162  * Other transitions are triggered by messages sent using suspend().  All
 163  * these transitions quiesce the driver, so that I/O queues are inactive.
 164  * That commonly entails turning off IRQs and DMA; there may be rules
 165  * about how to quiesce that are specific to the bus or the device's type.
 166  * (For example, network drivers mark the link state.)  Other details may
 167  * differ according to the message:
 168  *
 169  * SUSPEND      Quiesce, enter a low power device state appropriate for
 170  *              the upcoming system state (such as PCI_D3hot), and enable
 171  *              wakeup events as appropriate.
 172  *
 173  * FREEZE       Quiesce operations so that a consistent image can be saved;
 174  *              but do NOT otherwise enter a low power device state, and do
 175  *              NOT emit system wakeup events.
 176  *
 177  * PRETHAW      Quiesce as if for FREEZE; additionally, prepare for restoring
 178  *              the system from a snapshot taken after an earlier FREEZE.
 179  *              Some drivers will need to reset their hardware state instead
 180  *              of preserving it, to ensure that it's never mistaken for the
 181  *              state which that earlier snapshot had set up.
 182  *
 183  * A minimally power-aware driver treats all messages as SUSPEND, fully
 184  * reinitializes its device during resume() -- whether or not it was reset
 185  * during the suspend/resume cycle -- and can't issue wakeup events.
 186  *
 187  * More power-aware drivers may also use low power states at runtime as
 188  * well as during system sleep states like PM_SUSPEND_STANDBY.  They may
 189  * be able to use wakeup events to exit from runtime low-power states,
 190  * or from system low-power states such as standby or suspend-to-RAM.
 191  */
 192
 193 #define PM_EVENT_ON 0
 194 #define PM_EVENT_FREEZE 1
 195 #define PM_EVENT_SUSPEND 2
 196 #define PM_EVENT_PRETHAW 3
 197
 198 #define PMSG_FREEZE     ((struct pm_message){ .event = PM_EVENT_FREEZE, })
 199 #define PMSG_PRETHAW    ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
 200 #define PMSG_SUSPEND    ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
 201 #define PMSG_ON         ((struct pm_message){ .event = PM_EVENT_ON, })
 202
 203 struct dev_pm_info {
 204         pm_message_t            power_state;
 205         unsigned                can_wakeup:1;
 206 #ifdef  CONFIG_PM
 207         unsigned                should_wakeup:1;
 208         pm_message_t            prev_state;
 209         void                    * saved_state;
 210         struct device           * pm_parent;
 211         struct list_head        entry;
 212 #endif
 213 };
 214
 215 extern void device_pm_set_parent(struct device * dev, struct device * parent);
 216
 217 extern int device_power_down(pm_message_t state);
 218 extern void device_power_up(void);
 219 extern void device_resume(void);
 220
 221 #ifdef CONFIG_PM
 222 extern suspend_disk_method_t pm_disk_mode;
 223
 224 extern int device_suspend(pm_message_t state);
 225 extern int device_prepare_suspend(pm_message_t state);
 226
 227 #define device_set_wakeup_enable(dev,val) \
 228         ((dev)->power.should_wakeup = !!(val))
 229 #define device_may_wakeup(dev) \
 230         (device_can_wakeup(dev) && (dev)->power.should_wakeup)
 231
 232 extern int dpm_runtime_suspend(struct device *, pm_message_t);
 233 extern void dpm_runtime_resume(struct device *);
 234 extern void __suspend_report_result(const char *function, void *fn, int ret);
 235
 236 #define suspend_report_result(fn, ret)                                  \
 237         do {                                                            \
 238                 __suspend_report_result(__FUNCTION__, fn, ret);         \
 239         } while (0)
 240
 241 #else /* !CONFIG_PM */
 242
 243 static inline int device_suspend(pm_message_t state)
 244 {
 245         return 0;
 246 }
 247
 248 #define device_set_wakeup_enable(dev,val)       do{}while(0)
 249 #define device_may_wakeup(dev)                  (0)
 250
 251 static inline int dpm_runtime_suspend(struct device * dev, pm_message_t state)
 252 {
 253         return 0;
 254 }
 255
 256 static inline void dpm_runtime_resume(struct device * dev)
 257 {
 258 }
 259
 260 #define suspend_report_result(fn, ret) do { } while (0)
 261
 262 #endif
 263
 264 /* changes to device_may_wakeup take effect on the next pm state change.
 265  * by default, devices should wakeup if they can.
 266  */
 267 #define device_can_wakeup(dev) \
 268         ((dev)->power.can_wakeup)
 269 #define device_init_wakeup(dev,val) \
 270         do { \
 271                 device_can_wakeup(dev) = !!(val); \
 272                 device_set_wakeup_enable(dev,val); \
 273         } while(0)
 274
 275 #endif /* __KERNEL__ */
 276
 277 #endif /* _LINUX_PM_H */