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 *pm_register(pm_dev_t type, unsigned long id, pm_callback callback);
 107
 108 /*
 109  * Unregister a device with power management
 110  */
 111 void __deprecated pm_unregister(struct pm_dev *dev);
 112
 113 /*
 114  * Unregister all devices with matching callback
 115  */
 116 void __deprecated pm_unregister_all(pm_callback callback);
 117
 118 /*
 119  * Send a request to all devices
 120  */
 121 int __deprecated pm_send_all(pm_request_t rqst, void *data);
 122
 123 #else /* CONFIG_PM */
 124
 125 #define PM_IS_ACTIVE() 0
 126
 127 static inline struct pm_dev *pm_register(pm_dev_t type,
 128                                          unsigned long id,
 129                                          pm_callback callback)
 130 {
 131         return NULL;
 132 }
 133
 134 static inline void pm_unregister(struct pm_dev *dev) {}
 135
 136 static inline void pm_unregister_all(pm_callback callback) {}
 137
 138 static inline int pm_send_all(pm_request_t rqst, void *data)
 139 {
 140         return 0;
 141 }
 142
 143 #endif /* CONFIG_PM */
 144
 145 /* Functions above this comment are list-based old-style power
 146  * managment. Please avoid using them.  */
 147
 148 /*
 149  * Callbacks for platform drivers to implement.
 150  */
 151 extern void (*pm_idle)(void);
 152 extern void (*pm_power_off)(void);
 153
 154 typedef int __bitwise suspend_state_t;
 155
 156 #define PM_SUSPEND_ON           ((__force suspend_state_t) 0)
 157 #define PM_SUSPEND_STANDBY      ((__force suspend_state_t) 1)
 158 #define PM_SUSPEND_MEM          ((__force suspend_state_t) 3)
 159 #define PM_SUSPEND_DISK         ((__force suspend_state_t) 4)
 160 #define PM_SUSPEND_MAX          ((__force suspend_state_t) 5)
 161
 162 typedef int __bitwise suspend_disk_method_t;
 163
 164 #define PM_DISK_FIRMWARE        ((__force suspend_disk_method_t) 1)
 165 #define PM_DISK_PLATFORM        ((__force suspend_disk_method_t) 2)
 166 #define PM_DISK_SHUTDOWN        ((__force suspend_disk_method_t) 3)
 167 #define PM_DISK_REBOOT          ((__force suspend_disk_method_t) 4)
 168 #define PM_DISK_MAX             ((__force suspend_disk_method_t) 5)
 169
 170 struct pm_ops {
 171         suspend_disk_method_t pm_disk_mode;
 172         int (*prepare)(suspend_state_t state);
 173         int (*enter)(suspend_state_t state);
 174         int (*finish)(suspend_state_t state);
 175 };
 176
 177 extern void pm_set_ops(struct pm_ops *);
 178
 179 extern int pm_suspend(suspend_state_t state);
 180
 181
 182 /*
 183  * Device power management
 184  */
 185
 186 struct device;
 187
 188 typedef u32 __bitwise pm_message_t;
 189
 190 /*
 191  * There are 4 important states driver can be in:
 192  * ON     -- driver is working
 193  * FREEZE -- stop operations and apply whatever policy is applicable to a suspended driver
 194  *           of that class, freeze queues for block like IDE does, drop packets for
 195  *           ethernet, etc... stop DMA engine too etc... so a consistent image can be
 196  *           saved; but do not power any hardware down.
 197  * SUSPEND - like FREEZE, but hardware is doing as much powersaving as possible. Roughly
 198  *           pci D3.
 199  *
 200  * Unfortunately, current drivers only recognize numeric values 0 (ON) and 3 (SUSPEND).
 201  * We'll need to fix the drivers. So yes, putting 3 to all diferent defines is intentional,
 202  * and will go away as soon as drivers are fixed. Also note that typedef is neccessary,
 203  * we'll probably want to switch to
 204  *   typedef struct pm_message_t { int event; int flags; } pm_message_t
 205  * or something similar soon.
 206  */
 207
 208 #define PMSG_FREEZE     ((__force pm_message_t) 3)
 209 #define PMSG_SUSPEND    ((__force pm_message_t) 3)
 210 #define PMSG_ON         ((__force pm_message_t) 0)
 211
 212 struct dev_pm_info {
 213         pm_message_t            power_state;
 214 #ifdef  CONFIG_PM
 215         pm_message_t            prev_state;
 216         void                    * saved_state;
 217         atomic_t                pm_users;
 218         struct device           * pm_parent;
 219         struct list_head        entry;
 220 #endif
 221 };
 222
 223 extern void device_pm_set_parent(struct device * dev, struct device * parent);
 224
 225 extern int device_suspend(pm_message_t state);
 226 extern int device_power_down(pm_message_t state);
 227 extern void device_power_up(void);
 228 extern void device_resume(void);
 229
 230
 231 #endif /* __KERNEL__ */
 232
 233 #endif /* _LINUX_PM_H */