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/config.h>
  27 #include <linux/list.h>
  28 #include <asm/atomic.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 #ifdef CONFIG_PM
  98
  99 extern int pm_active;
 100
 101 #define PM_IS_ACTIVE() (pm_active != 0)
 102
 103 /*
 104  * Register a device with power management
 105  */
 106 struct pm_dev __deprecated *
 107 pm_register(pm_dev_t type, unsigned long id, pm_callback callback);
 108
 109 /*
 110  * Unregister a device with power management
 111  */
 112 void __deprecated pm_unregister(struct pm_dev *dev);
 113
 114 /*
 115  * Unregister all devices with matching callback
 116  */
 117 void __deprecated pm_unregister_all(pm_callback callback);
 118
 119 /*
 120  * Send a request to all devices
 121  */
 122 int __deprecated pm_send_all(pm_request_t rqst, void *data);
 123
 124 #else /* CONFIG_PM */
 125
 126 #define PM_IS_ACTIVE() 0
 127
 128 static inline struct pm_dev *pm_register(pm_dev_t type,
 129                                          unsigned long id,
 130                                          pm_callback callback)
 131 {
 132         return NULL;
 133 }
 134
 135 static inline void pm_unregister(struct pm_dev *dev) {}
 136
 137 static inline void pm_unregister_all(pm_callback callback) {}
 138
 139 static inline int pm_send_all(pm_request_t rqst, void *data)
 140 {
 141         return 0;
 142 }
 143
 144 #endif /* CONFIG_PM */
 145
 146 /* Functions above this comment are list-based old-style power
 147  * managment. Please avoid using them.  */
 148
 149 /*
 150  * Callbacks for platform drivers to implement.
 151  */
 152 extern void (*pm_idle)(void);
 153 extern void (*pm_power_off)(void);
 154
 155 typedef int __bitwise suspend_state_t;
 156
 157 #define PM_SUSPEND_ON           ((__force suspend_state_t) 0)
 158 #define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 1)
 159 #define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)
 160 #define PM_SUSPEND_DISK         ((__force suspend_state_t) 4)
 161 #define PM_SUSPEND_MAX          ((__force suspend_state_t) 5)
 162
 163 typedef int __bitwise suspend_disk_method_t;
 164
 165 #define PM_DISK_FIRMWARE        ((__force suspend_disk_method_t) 1)
 166 #define PM_DISK_PLATFORM        ((__force suspend_disk_method_t) 2)
 167 #define PM_DISK_SHUTDOWN        ((__force suspend_disk_method_t) 3)
 168 #define PM_DISK_REBOOT          ((__force suspend_disk_method_t) 4)
 169 #define PM_DISK_MAX             ((__force suspend_disk_method_t) 5)
 170
 171 struct pm_ops {
 172         suspend_disk_method_t pm_disk_mode;
 173         int (*prepare)(suspend_state_t state);
 174         int (*enter)(suspend_state_t state);
 175         int (*finish)(suspend_state_t state);
 176 };
 177
 178 extern void pm_set_ops(struct pm_ops *);
 179 extern struct pm_ops *pm_ops;
 180 extern int pm_suspend(suspend_state_t state);
 181
 182
 183 /*
 184  * Device power management
 185  */
 186
 187 struct device;
 188
 189 typedef struct pm_message {
 190         int event;
 191 } pm_message_t;
 192
 193 /*
 194  * There are 4 important states driver can be in:
 195  * ON     -- driver is working
 196  * FREEZE -- stop operations and apply whatever policy is applicable to a
 197  *           suspended driver of that class, freeze queues for block like IDE
 198  *           does, drop packets for ethernet, etc... stop DMA engine too etc...
 199  *           so a consistent image can be saved; but do not power any hardware
 200  *           down.
 201  * SUSPEND - like FREEZE, but hardware is doing as much powersaving as
 202  *           possible. Roughly pci D3.
 203  *
 204  * Unfortunately, current drivers only recognize numeric values 0 (ON) and 3
 205  * (SUSPEND).  We'll need to fix the drivers. So yes, putting 3 to all different
 206  * defines is intentional, and will go away as soon as drivers are fixed.  Also
 207  * note that typedef is neccessary, we'll probably want to switch to
 208  *   typedef struct pm_message_t { int event; int flags; } pm_message_t
 209  * or something similar soon.
 210  */
 211
 212 #define PM_EVENT_ON 0
 213 #define PM_EVENT_FREEZE 1
 214 #define PM_EVENT_SUSPEND 2
 215
 216 #define PMSG_FREEZE     ((struct pm_message){ .event = PM_EVENT_FREEZE, })
 217 #define PMSG_SUSPEND    ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
 218 #define PMSG_ON         ((struct pm_message){ .event = PM_EVENT_ON, })
 219
 220 struct dev_pm_info {
 221         pm_message_t            power_state;
 222 #ifdef  CONFIG_PM
 223         pm_message_t            prev_state;
 224         void                    * saved_state;
 225         atomic_t                pm_users;
 226         struct device           * pm_parent;
 227         struct list_head        entry;
 228 #endif
 229 };
 230
 231 extern void device_pm_set_parent(struct device * dev, struct device * parent);
 232
 233 extern int device_power_down(pm_message_t state);
 234 extern void device_power_up(void);
 235 extern void device_resume(void);
 236
 237 #ifdef CONFIG_PM
 238 extern int device_suspend(pm_message_t state);
 239 #else
 240 static inline int device_suspend(pm_message_t state)
 241 {
 242         return 0;
 243 }
 244 #endif
 245
 246 #endif /* __KERNEL__ */
 247
 248 #endif /* _LINUX_PM_H */