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
  32  */
  33 enum
  34 {
  35         PM_SUSPEND, /* enter D1-D3 */
  36         PM_RESUME,  /* enter D0 */
  37
  38         PM_SAVE_STATE,  /* save device's state */
  39
  40         /* enable wake-on */
  41         PM_SET_WAKEUP,
  42
  43         /* bus resource management */
  44         PM_GET_RESOURCES,
  45         PM_SET_RESOURCES,
  46
  47         /* base station management */
  48         PM_EJECT,
  49         PM_LOCK,
  50 };
  51
  52 typedef int pm_request_t;
  53
  54 /*
  55  * Device types
  56  */
  57 enum
  58 {
  59         PM_UNKNOWN_DEV = 0, /* generic */
  60         PM_SYS_DEV,         /* system device (fan, KB controller, ...) */
  61         PM_PCI_DEV,         /* PCI device */
  62         PM_USB_DEV,         /* USB device */
  63         PM_SCSI_DEV,        /* SCSI device */
  64         PM_ISA_DEV,         /* ISA device */
  65         PM_MTD_DEV,         /* Memory Technology Device */
  66 };
  67
  68 typedef int pm_dev_t;
  69
  70 /*
  71  * System device hardware ID (PnP) values
  72  */
  73 enum
  74 {
  75         PM_SYS_UNKNOWN = 0x00000000, /* generic */
  76         PM_SYS_KBC =     0x41d00303, /* keyboard controller */
  77         PM_SYS_COM =     0x41d00500, /* serial port */
  78         PM_SYS_IRDA =    0x41d00510, /* IRDA controller */
  79         PM_SYS_FDC =     0x41d00700, /* floppy controller */
  80         PM_SYS_VGA =     0x41d00900, /* VGA controller */
  81         PM_SYS_PCMCIA =  0x41d00e00, /* PCMCIA controller */
  82 };
  83
  84 /*
  85  * Device identifier
  86  */
  87 #define PM_PCI_ID(dev) ((dev)->bus->number << 16 | (dev)->devfn)
  88
  89 /*
  90  * Request handler callback
  91  */
  92 struct pm_dev;
  93
  94 typedef int (*pm_callback)(struct pm_dev *dev, pm_request_t rqst, void *data);
  95
  96 /*
  97  * Dynamic device information
  98  */
  99 struct pm_dev
 100 {
 101         pm_dev_t         type;
 102         unsigned long    id;
 103         pm_callback      callback;
 104         void            *data;
 105
 106         unsigned long    flags;
 107         unsigned long    state;
 108         unsigned long    prev_state;
 109
 110         struct list_head entry;
 111 };
 112
 113 #ifdef CONFIG_PM
 114
 115 extern int pm_active;
 116
 117 #define PM_IS_ACTIVE() (pm_active != 0)
 118
 119 /*
 120  * Register a device with power management
 121  */
 122 struct pm_dev *pm_register(pm_dev_t type,
 123                            unsigned long id,
 124                            pm_callback callback);
 125
 126 /*
 127  * Unregister a device with power management
 128  */
 129 void pm_unregister(struct pm_dev *dev);
 130
 131 /*
 132  * Unregister all devices with matching callback
 133  */
 134 void pm_unregister_all(pm_callback callback);
 135
 136 /*
 137  * Send a request to a single device
 138  */
 139 int pm_send(struct pm_dev *dev, pm_request_t rqst, void *data);
 140
 141 /*
 142  * Send a request to all devices
 143  */
 144 int pm_send_all(pm_request_t rqst, void *data);
 145
 146 /*
 147  * Find a device
 148  */
 149 struct pm_dev *pm_find(pm_dev_t type, struct pm_dev *from);
 150
 151 static inline void pm_access(struct pm_dev *dev) {}
 152 static inline void pm_dev_idle(struct pm_dev *dev) {}
 153
 154 #else /* CONFIG_PM */
 155
 156 #define PM_IS_ACTIVE() 0
 157
 158 static inline struct pm_dev *pm_register(pm_dev_t type,
 159                                          unsigned long id,
 160                                          pm_callback callback)
 161 {
 162         return NULL;
 163 }
 164
 165 static inline void pm_unregister(struct pm_dev *dev) {}
 166
 167 static inline void pm_unregister_all(pm_callback callback) {}
 168
 169 static inline int pm_send(struct pm_dev *dev, pm_request_t rqst, void *data)
 170 {
 171         return 0;
 172 }
 173
 174 static inline int pm_send_all(pm_request_t rqst, void *data)
 175 {
 176         return 0;
 177 }
 178
 179 static inline struct pm_dev *pm_find(pm_dev_t type, struct pm_dev *from)
 180 {
 181         return 0;
 182 }
 183
 184 static inline void pm_access(struct pm_dev *dev) {}
 185 static inline void pm_dev_idle(struct pm_dev *dev) {}
 186
 187 #endif /* CONFIG_PM */
 188
 189
 190 /*
 191  * Callbacks for platform drivers to implement.
 192  */
 193 extern void (*pm_idle)(void);
 194 extern void (*pm_power_off)(void);
 195
 196 enum {
 197         PM_SUSPEND_ON = 0,
 198         PM_SUSPEND_STANDBY = 1,
 199         /* NOTE: PM_SUSPEND_MEM == PCI_D3hot */
 200         PM_SUSPEND_MEM = 3,
 201         PM_SUSPEND_DISK = 4,
 202         PM_SUSPEND_MAX = 5,
 203 };
 204
 205 enum {
 206         PM_DISK_FIRMWARE = 1,
 207         PM_DISK_PLATFORM,
 208         PM_DISK_SHUTDOWN,
 209         PM_DISK_REBOOT,
 210         PM_DISK_MAX,
 211 };
 212
 213
 214 struct pm_ops {
 215         u32     pm_disk_mode;
 216         int (*prepare)(u32 state);
 217         int (*enter)(u32 state);
 218         int (*finish)(u32 state);
 219 };
 220
 221 extern void pm_set_ops(struct pm_ops *);
 222
 223 extern int pm_suspend(u32 state);
 224
 225
 226 /*
 227  * Device power management
 228  */
 229
 230 struct device;
 231
 232 struct dev_pm_info {
 233         u32                     power_state;
 234 #ifdef  CONFIG_PM
 235         u32                     prev_state;
 236         u8                      * saved_state;
 237         atomic_t                pm_users;
 238         struct device           * pm_parent;
 239         struct list_head        entry;
 240 #endif
 241 };
 242
 243 extern void device_pm_set_parent(struct device * dev, struct device * parent);
 244
 245 extern int device_suspend(u32 state);
 246 extern int device_power_down(u32 state);
 247 extern void device_power_up(void);
 248 extern void device_resume(void);
 249
 250
 251 #endif /* __KERNEL__ */
 252
 253 #endif /* _LINUX_PM_H */