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path: root/kernel/power/tuxonice_power_off.c
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Diffstat (limited to 'kernel/power/tuxonice_power_off.c')
-rw-r--r--kernel/power/tuxonice_power_off.c286
1 files changed, 286 insertions, 0 deletions
diff --git a/kernel/power/tuxonice_power_off.c b/kernel/power/tuxonice_power_off.c
new file mode 100644
index 000000000..f8e969625
--- /dev/null
+++ b/kernel/power/tuxonice_power_off.c
@@ -0,0 +1,286 @@
+/*
+ * kernel/power/tuxonice_power_off.c
+ *
+ * Copyright (C) 2006-2015 Nigel Cunningham (nigel at nigelcunningham com au)
+ *
+ * This file is released under the GPLv2.
+ *
+ * Support for powering down.
+ */
+
+#include <linux/device.h>
+#include <linux/suspend.h>
+#include <linux/mm.h>
+#include <linux/pm.h>
+#include <linux/reboot.h>
+#include <linux/cpu.h>
+#include <linux/console.h>
+#include <linux/fs.h>
+#include "tuxonice.h"
+#include "tuxonice_ui.h"
+#include "tuxonice_power_off.h"
+#include "tuxonice_sysfs.h"
+#include "tuxonice_modules.h"
+#include "tuxonice_io.h"
+
+unsigned long toi_poweroff_method; /* 0 - Kernel power off */
+
+static int wake_delay;
+static char lid_state_file[256], wake_alarm_dir[256];
+static struct file *lid_file, *alarm_file, *epoch_file;
+static int post_wake_state = -1;
+
+static int did_suspend_to_both;
+
+/*
+ * __toi_power_down
+ * Functionality : Powers down or reboots the computer once the image
+ * has been written to disk.
+ * Key Assumptions : Able to reboot/power down via code called or that
+ * the warning emitted if the calls fail will be visible
+ * to the user (ie printk resumes devices).
+ */
+
+static void __toi_power_down(int method)
+{
+ int error;
+
+ toi_cond_pause(1, test_action_state(TOI_REBOOT) ? "Ready to reboot." :
+ "Powering down.");
+
+ if (test_result_state(TOI_ABORTED))
+ goto out;
+
+ if (test_action_state(TOI_REBOOT))
+ kernel_restart(NULL);
+
+ switch (method) {
+ case 0:
+ break;
+ case 3:
+ /*
+ * Re-read the overwritten part of pageset2 to make post-resume
+ * faster.
+ */
+ if (read_pageset2(1))
+ panic("Attempt to reload pagedir 2 failed. "
+ "Try rebooting.");
+
+ pm_prepare_console();
+
+ error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
+ if (!error) {
+ pm_restore_gfp_mask();
+ error = suspend_devices_and_enter(PM_SUSPEND_MEM);
+ pm_restrict_gfp_mask();
+ if (!error)
+ did_suspend_to_both = 1;
+ }
+ pm_notifier_call_chain(PM_POST_SUSPEND);
+ pm_restore_console();
+
+ /* Success - we're now post-resume-from-ram */
+ if (did_suspend_to_both)
+ return;
+
+ /* Failed to suspend to ram - do normal power off */
+ break;
+ case 4:
+ /*
+ * If succeeds, doesn't return. If fails, do a simple
+ * powerdown.
+ */
+ hibernation_platform_enter();
+ break;
+ case 5:
+ /* Historic entry only now */
+ break;
+ }
+
+ if (method && method != 5)
+ toi_cond_pause(1,
+ "Falling back to alternate power off method.");
+
+ if (test_result_state(TOI_ABORTED))
+ goto out;
+
+ if (pm_power_off)
+ kernel_power_off();
+ kernel_halt();
+ toi_cond_pause(1, "Powerdown failed.");
+ while (1)
+ cpu_relax();
+
+out:
+ if (read_pageset2(1))
+ panic("Attempt to reload pagedir 2 failed. Try rebooting.");
+ return;
+}
+
+#define CLOSE_FILE(file) \
+ if (file) { \
+ filp_close(file, NULL); file = NULL; \
+ }
+
+static void powerdown_cleanup(int toi_or_resume)
+{
+ if (!toi_or_resume)
+ return;
+
+ CLOSE_FILE(lid_file);
+ CLOSE_FILE(alarm_file);
+ CLOSE_FILE(epoch_file);
+}
+
+static void open_file(char *format, char *arg, struct file **var, int mode,
+ char *desc)
+{
+ char buf[256];
+
+ if (strlen(arg)) {
+ sprintf(buf, format, arg);
+ *var = filp_open(buf, mode, 0);
+ if (IS_ERR(*var) || !*var) {
+ printk(KERN_INFO "Failed to open %s file '%s' (%p).\n",
+ desc, buf, *var);
+ *var = NULL;
+ }
+ }
+}
+
+static int powerdown_init(int toi_or_resume)
+{
+ if (!toi_or_resume)
+ return 0;
+
+ did_suspend_to_both = 0;
+
+ open_file("/proc/acpi/button/%s/state", lid_state_file, &lid_file,
+ O_RDONLY, "lid");
+
+ if (strlen(wake_alarm_dir)) {
+ open_file("/sys/class/rtc/%s/wakealarm", wake_alarm_dir,
+ &alarm_file, O_WRONLY, "alarm");
+
+ open_file("/sys/class/rtc/%s/since_epoch", wake_alarm_dir,
+ &epoch_file, O_RDONLY, "epoch");
+ }
+
+ return 0;
+}
+
+static int lid_closed(void)
+{
+ char array[25];
+ ssize_t size;
+ loff_t pos = 0;
+
+ if (!lid_file)
+ return 0;
+
+ size = vfs_read(lid_file, (char __user *) array, 25, &pos);
+ if ((int) size < 1) {
+ printk(KERN_INFO "Failed to read lid state file (%d).\n",
+ (int) size);
+ return 0;
+ }
+
+ if (!strcmp(array, "state: closed\n"))
+ return 1;
+
+ return 0;
+}
+
+static void write_alarm_file(int value)
+{
+ ssize_t size;
+ char buf[40];
+ loff_t pos = 0;
+
+ if (!alarm_file)
+ return;
+
+ sprintf(buf, "%d\n", value);
+
+ size = vfs_write(alarm_file, (char __user *)buf, strlen(buf), &pos);
+
+ if (size < 0)
+ printk(KERN_INFO "Error %d writing alarm value %s.\n",
+ (int) size, buf);
+}
+
+/**
+ * toi_check_resleep: See whether to powerdown again after waking.
+ *
+ * After waking, check whether we should powerdown again in a (usually
+ * different) way. We only do this if the lid switch is still closed.
+ */
+void toi_check_resleep(void)
+{
+ /* We only return if we suspended to ram and woke. */
+ if (lid_closed() && post_wake_state >= 0)
+ __toi_power_down(post_wake_state);
+}
+
+void toi_power_down(void)
+{
+ if (alarm_file && wake_delay) {
+ char array[25];
+ loff_t pos = 0;
+ size_t size = vfs_read(epoch_file, (char __user *) array, 25,
+ &pos);
+
+ if (((int) size) < 1)
+ printk(KERN_INFO "Failed to read epoch file (%d).\n",
+ (int) size);
+ else {
+ unsigned long since_epoch;
+ if (!kstrtoul(array, 0, &since_epoch)) {
+ /* Clear any wakeup time. */
+ write_alarm_file(0);
+
+ /* Set new wakeup time. */
+ write_alarm_file(since_epoch + wake_delay);
+ }
+ }
+ }
+
+ __toi_power_down(toi_poweroff_method);
+
+ toi_check_resleep();
+}
+
+static struct toi_sysfs_data sysfs_params[] = {
+#if defined(CONFIG_ACPI)
+ SYSFS_STRING("lid_file", SYSFS_RW, lid_state_file, 256, 0, NULL),
+ SYSFS_INT("wake_delay", SYSFS_RW, &wake_delay, 0, INT_MAX, 0, NULL),
+ SYSFS_STRING("wake_alarm_dir", SYSFS_RW, wake_alarm_dir, 256, 0, NULL),
+ SYSFS_INT("post_wake_state", SYSFS_RW, &post_wake_state, -1, 5, 0,
+ NULL),
+ SYSFS_UL("powerdown_method", SYSFS_RW, &toi_poweroff_method, 0, 5, 0),
+ SYSFS_INT("did_suspend_to_both", SYSFS_READONLY, &did_suspend_to_both,
+ 0, 0, 0, NULL)
+#endif
+};
+
+static struct toi_module_ops powerdown_ops = {
+ .type = MISC_HIDDEN_MODULE,
+ .name = "poweroff",
+ .initialise = powerdown_init,
+ .cleanup = powerdown_cleanup,
+ .directory = "[ROOT]",
+ .module = THIS_MODULE,
+ .sysfs_data = sysfs_params,
+ .num_sysfs_entries = sizeof(sysfs_params) /
+ sizeof(struct toi_sysfs_data),
+};
+
+int toi_poweroff_init(void)
+{
+ return toi_register_module(&powerdown_ops);
+}
+
+void toi_poweroff_exit(void)
+{
+ toi_unregister_module(&powerdown_ops);
+}