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  * There are 4 important states driver can be in:
 146  * ON     -- driver is working
 147  * FREEZE -- stop operations and apply whatever policy is applicable to a
 148  *           suspended driver of that class, freeze queues for block like IDE
 149  *           does, drop packets for ethernet, etc... stop DMA engine too etc...
 150  *           so a consistent image can be saved; but do not power any hardware
 151  *           down.
 152  * SUSPEND - like FREEZE, but hardware is doing as much powersaving as
 153  *           possible. Roughly pci D3.
 154  *
 155  * Unfortunately, current drivers only recognize numeric values 0 (ON) and 3
 156  * (SUSPEND).  We'll need to fix the drivers. So yes, putting 3 to all different
 157  * defines is intentional, and will go away as soon as drivers are fixed.  Also
 158  * note that typedef is neccessary, we'll probably want to switch to
 159  *   typedef struct pm_message_t { int event; int flags; } pm_message_t
 160  * or something similar soon.
 161  */
 162
 163 #define PM_EVENT_ON 0
 164 #define PM_EVENT_FREEZE 1
 165 #define PM_EVENT_SUSPEND 2
 166
 167 #define PMSG_FREEZE     ((struct pm_message){ .event = PM_EVENT_FREEZE, })
 168 #define PMSG_SUSPEND    ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
 169 #define PMSG_ON         ((struct pm_message){ .event = PM_EVENT_ON, })
 170
 171 struct dev_pm_info {
 172         pm_message_t            power_state;
 173         unsigned                can_wakeup:1;
 174 #ifdef  CONFIG_PM
 175         unsigned                should_wakeup:1;
 176         pm_message_t            prev_state;
 177         void                    * saved_state;
 178         struct device           * pm_parent;
 179         struct list_head        entry;
 180 #endif
 181 };
 182
 183 extern void device_pm_set_parent(struct device * dev, struct device * parent);
 184
 185 extern int device_power_down(pm_message_t state);
 186 extern void device_power_up(void);
 187 extern void device_resume(void);
 188
 189 #ifdef CONFIG_PM
 190 extern suspend_disk_method_t pm_disk_mode;
 191
 192 extern int device_suspend(pm_message_t state);
 193
 194 #define device_set_wakeup_enable(dev,val) \
 195         ((dev)->power.should_wakeup = !!(val))
 196 #define device_may_wakeup(dev) \
 197         (device_can_wakeup(dev) && (dev)->power.should_wakeup)
 198
 199 extern int dpm_runtime_suspend(struct device *, pm_message_t);
 200 extern void dpm_runtime_resume(struct device *);
 201 extern void __suspend_report_result(const char *function, void *fn, int ret);
 202
 203 #define suspend_report_result(fn, ret)                                  \
 204         do {                                                            \
 205                 __suspend_report_result(__FUNCTION__, fn, ret);         \
 206         } while (0)
 207
 208 #else /* !CONFIG_PM */
 209
 210 static inline int device_suspend(pm_message_t state)
 211 {
 212         return 0;
 213 }
 214
 215 #define device_set_wakeup_enable(dev,val)       do{}while(0)
 216 #define device_may_wakeup(dev)                  (0)
 217
 218 static inline int dpm_runtime_suspend(struct device * dev, pm_message_t state)
 219 {
 220         return 0;
 221 }
 222
 223 static inline void dpm_runtime_resume(struct device * dev)
 224 {
 225 }
 226
 227 #define suspend_report_result(fn, ret) do { } while (0)
 228
 229 #endif
 230
 231 /* changes to device_may_wakeup take effect on the next pm state change.
 232  * by default, devices should wakeup if they can.
 233  */
 234 #define device_can_wakeup(dev) \
 235         ((dev)->power.can_wakeup)
 236 #define device_init_wakeup(dev,val) \
 237         do { \
 238                 device_can_wakeup(dev) = !!(val); \
 239                 device_set_wakeup_enable(dev,val); \
 240         } while(0)
 241
 242 #endif /* __KERNEL__ */
 243
 244 #endif /* _LINUX_PM_H */