diff options
Diffstat (limited to 'kernel/power/tuxonice_power_off.c')
| -rw-r--r-- | kernel/power/tuxonice_power_off.c | 286 |
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..7c78773cf --- /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); +} |