kernel/power/power.h

   1 #include <linux/suspend.h>
   2 #include <linux/utsname.h>
   3
   4 /* With SUSPEND_CONSOLE defined suspend looks *really* cool, but
   5    we probably do not take enough locks for switching consoles, etc,
   6    so bad things might happen.
   7 */
   8 #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
   9 #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
  10 #endif
  11
  12 #define MAX_PBES        ((PAGE_SIZE - sizeof(struct new_utsname) \
  13                         - 4 - 3*sizeof(unsigned long) - sizeof(int) \
  14                         - sizeof(void *)) / sizeof(swp_entry_t))
  15
  16 struct swsusp_info {
  17         struct new_utsname      uts;
  18         u32                     version_code;
  19         unsigned long           num_physpages;
  20         int                     cpus;
  21         unsigned long           image_pages;
  22         unsigned long           pagedir_pages;
  23         suspend_pagedir_t       * suspend_pagedir;
  24         swp_entry_t             pagedir[MAX_PBES];
  25 } __attribute__((aligned(PAGE_SIZE)));
  26
  27
  28
  29 #ifdef CONFIG_SOFTWARE_SUSPEND
  30 extern int pm_suspend_disk(void);
  31
  32 #else
  33 static inline int pm_suspend_disk(void)
  34 {
  35         return -EPERM;
  36 }
  37 #endif
  38 extern struct semaphore pm_sem;
  39 #define power_attr(_name) \
  40 static struct subsys_attribute _name##_attr = { \
  41         .attr   = {                             \
  42                 .name = __stringify(_name),     \
  43                 .mode = 0644,                   \
  44         },                                      \
  45         .show   = _name##_show,                 \
  46         .store  = _name##_store,                \
  47 }
  48
  49 extern struct subsystem power_subsys;
  50
  51 extern int freeze_processes(void);
  52 extern void thaw_processes(void);
  53
  54 extern int pm_prepare_console(void);
  55 extern void pm_restore_console(void);