projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * drivers/power/process.c - Functions for saving/restoring console. | |
| 3 | * | |
| 4 | * Originally from swsusp. | |
| 5 | */ | |
| 6 | ||
| 7 | #include <linux/vt_kern.h> | |
| 8 | #include <linux/kbd_kern.h> | |
| 9 | #include <linux/console.h> | |
| 10 | #include "power.h" | |
| 11 | ||
| 46cd2f32 RW |
12 | #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) |
| 13 | #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1) | |
| 14 | ||
| 1da177e4 | 15 | static int orig_fgconsole, orig_kmsg; |
| 1da177e4 LT |
16 | |
| 17 | int pm_prepare_console(void) | |
| 18 | { | |
| 1da177e4 LT |
19 | acquire_console_sem(); |
| 20 | ||
| 21 | orig_fgconsole = fg_console; | |
| 22 | ||
| 23 | if (vc_allocate(SUSPEND_CONSOLE)) { | |
| 24 | /* we can't have a free VC for now. Too bad, | |
| 25 | * we don't want to mess the screen for now. */ | |
| 26 | release_console_sem(); | |
| 27 | return 1; | |
| 28 | } | |
| 29 | ||
| b257bc05 AJ |
30 | if (set_console(SUSPEND_CONSOLE)) { |
| 31 | /* | |
| 32 | * We're unable to switch to the SUSPEND_CONSOLE. | |
| 33 | * Let the calling function know so it can decide | |
| 34 | * what to do. | |
| 35 | */ | |
| 36 | release_console_sem(); | |
| 37 | return 1; | |
| 38 | } | |
| 1da177e4 LT |
39 | release_console_sem(); |
| 40 | ||
| 41 | if (vt_waitactive(SUSPEND_CONSOLE)) { | |
| 42 | pr_debug("Suspend: Can't switch VCs."); | |
| 43 | return 1; | |
| 44 | } | |
| 45 | orig_kmsg = kmsg_redirect; | |
| 46 | kmsg_redirect = SUSPEND_CONSOLE; | |
| 1da177e4 LT |
47 | return 0; |
| 48 | } | |
| 49 | ||
| 50 | void pm_restore_console(void) | |
| 51 | { | |
| 1da177e4 LT |
52 | acquire_console_sem(); |
| 53 | set_console(orig_fgconsole); | |
| 54 | release_console_sem(); | |
| 55 | kmsg_redirect = orig_kmsg; | |
| 1da177e4 LT |
56 | return; |
| 57 | } | |
| f7b8988f | 58 | #endif |