| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 12 | static int new_loglevel = 10; |
| 13 | static int orig_loglevel; |
| 14 | #ifdef SUSPEND_CONSOLE |
| 15 | static int orig_fgconsole, orig_kmsg; |
| 16 | #endif |
| 17 | |
| 18 | int pm_prepare_console(void) |
| 19 | { |
| 20 | orig_loglevel = console_loglevel; |
| 21 | console_loglevel = new_loglevel; |
| 22 | |
| 23 | #ifdef SUSPEND_CONSOLE |
| 24 | acquire_console_sem(); |
| 25 | |
| 26 | orig_fgconsole = fg_console; |
| 27 | |
| 28 | if (vc_allocate(SUSPEND_CONSOLE)) { |
| 29 | /* we can't have a free VC for now. Too bad, |
| 30 | * we don't want to mess the screen for now. */ |
| 31 | release_console_sem(); |
| 32 | return 1; |
| 33 | } |
| 34 | |
| 35 | set_console(SUSPEND_CONSOLE); |
| 36 | release_console_sem(); |
| 37 | |
| 38 | if (vt_waitactive(SUSPEND_CONSOLE)) { |
| 39 | pr_debug("Suspend: Can't switch VCs."); |
| 40 | return 1; |
| 41 | } |
| 42 | orig_kmsg = kmsg_redirect; |
| 43 | kmsg_redirect = SUSPEND_CONSOLE; |
| 44 | #endif |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | void pm_restore_console(void) |
| 49 | { |
| 50 | console_loglevel = orig_loglevel; |
| 51 | #ifdef SUSPEND_CONSOLE |
| 52 | acquire_console_sem(); |
| 53 | set_console(orig_fgconsole); |
| 54 | release_console_sem(); |
| 55 | kmsg_redirect = orig_kmsg; |
| 56 | #endif |
| 57 | return; |
| 58 | } |