target/linux/goldfish/patches-2.6.30/0071-PM-earlysuspend-Add-console-switch-when-user-reque.patch

   1 From 0083b2afe89dea4a06bfd967b164318ad0bccd11 Mon Sep 17 00:00:00 2001
   2 From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
   3 Date: Wed, 15 Oct 2008 17:52:20 -0700
   4 Subject: [PATCH 071/134] PM: earlysuspend: Add console switch when user requested sleep state changes.
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=utf-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: Arve Hjønnevåg <arve@android.com>
  10 ---
  11  kernel/power/Kconfig               |   17 ++++++++
  12  kernel/power/Makefile              |    1 +
  13  kernel/power/consoleearlysuspend.c |   78 ++++++++++++++++++++++++++++++++++++
  14  3 files changed, 96 insertions(+), 0 deletions(-)
  15  create mode 100644 kernel/power/consoleearlysuspend.c
  16
  17 --- a/kernel/power/Kconfig
  18 +++ b/kernel/power/Kconfig
  19 @@ -157,6 +157,23 @@ config EARLYSUSPEND
  20           Call early suspend handlers when the user requested sleep state
  21           changes.
  22
  23 +choice
  24 +       prompt "User-space screen access"
  25 +       default CONSOLE_EARLYSUSPEND
  26 +       depends on HAS_EARLYSUSPEND
  27 +
  28 +       config NO_USER_SPACE_SCREEN_ACCESS_CONTROL
  29 +               bool "None"
  30 +
  31 +       config CONSOLE_EARLYSUSPEND
  32 +               bool "Console switch on early-suspend"
  33 +               depends on HAS_EARLYSUSPEND && VT
  34 +               ---help---
  35 +                 Register early suspend handler to perform a console switch to
  36 +                 when user-space should stop drawing to the screen and a switch
  37 +                 back when it should resume.
  38 +endchoice
  39 +
  40  config HIBERNATION
  41         bool "Hibernation (aka 'suspend to disk')"
  42         depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
  43 --- a/kernel/power/Makefile
  44 +++ b/kernel/power/Makefile
  45 @@ -9,6 +9,7 @@ obj-$(CONFIG_FREEZER)           += process.o
  46  obj-$(CONFIG_WAKELOCK)         += wakelock.o
  47  obj-$(CONFIG_USER_WAKELOCK)    += userwakelock.o
  48  obj-$(CONFIG_EARLYSUSPEND)     += earlysuspend.o
  49 +obj-$(CONFIG_CONSOLE_EARLYSUSPEND)     += consoleearlysuspend.o
  50  obj-$(CONFIG_HIBERNATION)      += swsusp.o disk.o snapshot.o swap.o user.o
  51
  52  obj-$(CONFIG_MAGIC_SYSRQ)      += poweroff.o
  53 --- /dev/null
  54 +++ b/kernel/power/consoleearlysuspend.c
  55 @@ -0,0 +1,78 @@
  56 +/* kernel/power/consoleearlysuspend.c
  57 + *
  58 + * Copyright (C) 2005-2008 Google, Inc.
  59 + *
  60 + * This software is licensed under the terms of the GNU General Public
  61 + * License version 2, as published by the Free Software Foundation, and
  62 + * may be copied, distributed, and modified under those terms.
  63 + *
  64 + * This program is distributed in the hope that it will be useful,
  65 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  66 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  67 + * GNU General Public License for more details.
  68 + *
  69 + */
  70 +
  71 +#include <linux/console.h>
  72 +#include <linux/earlysuspend.h>
  73 +#include <linux/kbd_kern.h>
  74 +#include <linux/module.h>
  75 +#include <linux/vt_kern.h>
  76 +#include <linux/wait.h>
  77 +
  78 +#define EARLY_SUSPEND_CONSOLE  (MAX_NR_CONSOLES-1)
  79 +
  80 +static int orig_fgconsole;
  81 +static void console_early_suspend(struct early_suspend *h)
  82 +{
  83 +       acquire_console_sem();
  84 +       orig_fgconsole = fg_console;
  85 +       if (vc_allocate(EARLY_SUSPEND_CONSOLE))
  86 +               goto err;
  87 +       if (set_console(EARLY_SUSPEND_CONSOLE))
  88 +               goto err;
  89 +       release_console_sem();
  90 +
  91 +       if (vt_waitactive(EARLY_SUSPEND_CONSOLE))
  92 +               pr_warning("console_early_suspend: Can't switch VCs.\n");
  93 +       return;
  94 +err:
  95 +       pr_warning("console_early_suspend: Can't set console\n");
  96 +       release_console_sem();
  97 +}
  98 +
  99 +static void console_late_resume(struct early_suspend *h)
 100 +{
 101 +       int ret;
 102 +       acquire_console_sem();
 103 +       ret = set_console(orig_fgconsole);
 104 +       release_console_sem();
 105 +       if (ret) {
 106 +               pr_warning("console_late_resume: Can't set console.\n");
 107 +               return;
 108 +       }
 109 +
 110 +       if (vt_waitactive(orig_fgconsole))
 111 +               pr_warning("console_late_resume: Can't switch VCs.\n");
 112 +}
 113 +
 114 +static struct early_suspend console_early_suspend_desc = {
 115 +       .level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
 116 +       .suspend = console_early_suspend,
 117 +       .resume = console_late_resume,
 118 +};
 119 +
 120 +static int __init console_early_suspend_init(void)
 121 +{
 122 +       register_early_suspend(&console_early_suspend_desc);
 123 +       return 0;
 124 +}
 125 +
 126 +static void  __exit console_early_suspend_exit(void)
 127 +{
 128 +       unregister_early_suspend(&console_early_suspend_desc);
 129 +}
 130 +
 131 +module_init(console_early_suspend_init);
 132 +module_exit(console_early_suspend_exit);
 133 +