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134 lines
4.0 KiB
Diff
134 lines
4.0 KiB
Diff
From 0083b2afe89dea4a06bfd967b164318ad0bccd11 Mon Sep 17 00:00:00 2001
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From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
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Date: Wed, 15 Oct 2008 17:52:20 -0700
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Subject: [PATCH 071/134] PM: earlysuspend: Add console switch when user requested sleep state changes.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: 8bit
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Signed-off-by: Arve Hjønnevåg <arve@android.com>
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---
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kernel/power/Kconfig | 17 ++++++++
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kernel/power/Makefile | 1 +
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kernel/power/consoleearlysuspend.c | 78 ++++++++++++++++++++++++++++++++++++
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3 files changed, 96 insertions(+), 0 deletions(-)
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create mode 100644 kernel/power/consoleearlysuspend.c
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--- a/kernel/power/Kconfig
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+++ b/kernel/power/Kconfig
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@@ -157,6 +157,23 @@ config EARLYSUSPEND
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Call early suspend handlers when the user requested sleep state
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changes.
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+choice
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+ prompt "User-space screen access"
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+ default CONSOLE_EARLYSUSPEND
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+ depends on HAS_EARLYSUSPEND
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+
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+ config NO_USER_SPACE_SCREEN_ACCESS_CONTROL
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+ bool "None"
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+
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+ config CONSOLE_EARLYSUSPEND
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+ bool "Console switch on early-suspend"
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+ depends on HAS_EARLYSUSPEND && VT
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+ ---help---
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+ Register early suspend handler to perform a console switch to
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+ when user-space should stop drawing to the screen and a switch
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+ back when it should resume.
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+endchoice
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+
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config HIBERNATION
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bool "Hibernation (aka 'suspend to disk')"
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depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
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--- a/kernel/power/Makefile
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+++ b/kernel/power/Makefile
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@@ -9,6 +9,7 @@ obj-$(CONFIG_FREEZER) += process.o
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obj-$(CONFIG_WAKELOCK) += wakelock.o
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obj-$(CONFIG_USER_WAKELOCK) += userwakelock.o
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obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o
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+obj-$(CONFIG_CONSOLE_EARLYSUSPEND) += consoleearlysuspend.o
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obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
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obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
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--- /dev/null
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+++ b/kernel/power/consoleearlysuspend.c
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@@ -0,0 +1,78 @@
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+/* kernel/power/consoleearlysuspend.c
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+ *
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+ * Copyright (C) 2005-2008 Google, Inc.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#include <linux/console.h>
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+#include <linux/earlysuspend.h>
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+#include <linux/kbd_kern.h>
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+#include <linux/module.h>
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+#include <linux/vt_kern.h>
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+#include <linux/wait.h>
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+
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+#define EARLY_SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
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+
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+static int orig_fgconsole;
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+static void console_early_suspend(struct early_suspend *h)
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+{
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+ acquire_console_sem();
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+ orig_fgconsole = fg_console;
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+ if (vc_allocate(EARLY_SUSPEND_CONSOLE))
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+ goto err;
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+ if (set_console(EARLY_SUSPEND_CONSOLE))
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+ goto err;
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+ release_console_sem();
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+
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+ if (vt_waitactive(EARLY_SUSPEND_CONSOLE))
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+ pr_warning("console_early_suspend: Can't switch VCs.\n");
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+ return;
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+err:
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+ pr_warning("console_early_suspend: Can't set console\n");
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+ release_console_sem();
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+}
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+
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+static void console_late_resume(struct early_suspend *h)
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+{
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+ int ret;
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+ acquire_console_sem();
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+ ret = set_console(orig_fgconsole);
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+ release_console_sem();
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+ if (ret) {
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+ pr_warning("console_late_resume: Can't set console.\n");
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+ return;
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+ }
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+
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+ if (vt_waitactive(orig_fgconsole))
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+ pr_warning("console_late_resume: Can't switch VCs.\n");
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+}
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+
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+static struct early_suspend console_early_suspend_desc = {
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+ .level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
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+ .suspend = console_early_suspend,
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+ .resume = console_late_resume,
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+};
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+
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+static int __init console_early_suspend_init(void)
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+{
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+ register_early_suspend(&console_early_suspend_desc);
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+ return 0;
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+}
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+
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+static void __exit console_early_suspend_exit(void)
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+{
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+ unregister_early_suspend(&console_early_suspend_desc);
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+}
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+
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+module_init(console_early_suspend_init);
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+module_exit(console_early_suspend_exit);
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+
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