| /* |
| * sleep.c - ACPI sleep support. |
| * |
| * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> |
| * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> |
| * Copyright (c) 2000-2003 Patrick Mochel |
| * Copyright (c) 2003 Open Source Development Lab |
| * |
| * This file is released under the GPLv2. |
| * |
| */ |
| |
| #include <linux/delay.h> |
| #include <linux/irq.h> |
| #include <linux/dmi.h> |
| #include <linux/device.h> |
| #include <linux/suspend.h> |
| #include <linux/reboot.h> |
| |
| #include <asm/io.h> |
| |
| #include <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.h> |
| |
| #include "internal.h" |
| #include "sleep.h" |
| |
| u8 sleep_states[ACPI_S_STATE_COUNT]; |
| |
| static void acpi_sleep_tts_switch(u32 acpi_state) |
| { |
| union acpi_object in_arg = { ACPI_TYPE_INTEGER }; |
| struct acpi_object_list arg_list = { 1, &in_arg }; |
| acpi_status status = AE_OK; |
| |
| in_arg.integer.value = acpi_state; |
| status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); |
| if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| /* |
| * OS can't evaluate the _TTS object correctly. Some warning |
| * message will be printed. But it won't break anything. |
| */ |
| printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); |
| } |
| } |
| |
| static int tts_notify_reboot(struct notifier_block *this, |
| unsigned long code, void *x) |
| { |
| acpi_sleep_tts_switch(ACPI_STATE_S5); |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block tts_notifier = { |
| .notifier_call = tts_notify_reboot, |
| .next = NULL, |
| .priority = 0, |
| }; |
| |
| static int acpi_sleep_prepare(u32 acpi_state) |
| { |
| #ifdef CONFIG_ACPI_SLEEP |
| /* do we have a wakeup address for S2 and S3? */ |
| if (acpi_state == ACPI_STATE_S3) { |
| if (!acpi_wakeup_address) { |
| return -EFAULT; |
| } |
| acpi_set_firmware_waking_vector( |
| (acpi_physical_address)acpi_wakeup_address); |
| |
| } |
| ACPI_FLUSH_CPU_CACHE(); |
| #endif |
| printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", |
| acpi_state); |
| acpi_enable_wakeup_devices(acpi_state); |
| acpi_enter_sleep_state_prep(acpi_state); |
| return 0; |
| } |
| |
| #ifdef CONFIG_ACPI_SLEEP |
| static u32 acpi_target_sleep_state = ACPI_STATE_S0; |
| |
| /* |
| * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the |
| * user to request that behavior by using the 'acpi_old_suspend_ordering' |
| * kernel command line option that causes the following variable to be set. |
| */ |
| static bool old_suspend_ordering; |
| |
| void __init acpi_old_suspend_ordering(void) |
| { |
| old_suspend_ordering = true; |
| } |
| |
| /** |
| * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. |
| */ |
| static int acpi_pm_freeze(void) |
| { |
| acpi_disable_all_gpes(); |
| acpi_os_wait_events_complete(NULL); |
| acpi_ec_block_transactions(); |
| return 0; |
| } |
| |
| /** |
| * __acpi_pm_prepare - Prepare the platform to enter the target state. |
| * |
| * If necessary, set the firmware waking vector and do arch-specific |
| * nastiness to get the wakeup code to the waking vector. |
| */ |
| static int __acpi_pm_prepare(void) |
| { |
| int error = acpi_sleep_prepare(acpi_target_sleep_state); |
| |
| suspend_nvs_save(); |
| |
| if (error) |
| acpi_target_sleep_state = ACPI_STATE_S0; |
| return error; |
| } |
| |
| /** |
| * acpi_pm_prepare - Prepare the platform to enter the target sleep |
| * state and disable the GPEs. |
| */ |
| static int acpi_pm_prepare(void) |
| { |
| int error = __acpi_pm_prepare(); |
| |
| if (!error) |
| acpi_pm_freeze(); |
| |
| return error; |
| } |
| |
| /** |
| * acpi_pm_finish - Instruct the platform to leave a sleep state. |
| * |
| * This is called after we wake back up (or if entering the sleep state |
| * failed). |
| */ |
| static void acpi_pm_finish(void) |
| { |
| u32 acpi_state = acpi_target_sleep_state; |
| |
| acpi_ec_unblock_transactions(); |
| |
| if (acpi_state == ACPI_STATE_S0) |
| return; |
| |
| printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", |
| acpi_state); |
| acpi_disable_wakeup_devices(acpi_state); |
| acpi_leave_sleep_state(acpi_state); |
| |
| /* reset firmware waking vector */ |
| acpi_set_firmware_waking_vector((acpi_physical_address) 0); |
| |
| acpi_target_sleep_state = ACPI_STATE_S0; |
| } |
| |
| /** |
| * acpi_pm_end - Finish up suspend sequence. |
| */ |
| static void acpi_pm_end(void) |
| { |
| suspend_nvs_free(); |
| /* |
| * This is necessary in case acpi_pm_finish() is not called during a |
| * failing transition to a sleep state. |
| */ |
| acpi_target_sleep_state = ACPI_STATE_S0; |
| acpi_sleep_tts_switch(acpi_target_sleep_state); |
| } |
| #else /* !CONFIG_ACPI_SLEEP */ |
| #define acpi_target_sleep_state ACPI_STATE_S0 |
| #endif /* CONFIG_ACPI_SLEEP */ |
| |
| #ifdef CONFIG_SUSPEND |
| extern void do_suspend_lowlevel(void); |
| |
| static u32 acpi_suspend_states[] = { |
| [PM_SUSPEND_ON] = ACPI_STATE_S0, |
| [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, |
| [PM_SUSPEND_MEM] = ACPI_STATE_S3, |
| [PM_SUSPEND_MAX] = ACPI_STATE_S5 |
| }; |
| |
| /** |
| * acpi_suspend_begin - Set the target system sleep state to the state |
| * associated with given @pm_state, if supported. |
| */ |
| static int acpi_suspend_begin(suspend_state_t pm_state) |
| { |
| u32 acpi_state = acpi_suspend_states[pm_state]; |
| int error = 0; |
| |
| error = suspend_nvs_alloc(); |
| |
| if (error) |
| return error; |
| |
| if (sleep_states[acpi_state]) { |
| acpi_target_sleep_state = acpi_state; |
| acpi_sleep_tts_switch(acpi_target_sleep_state); |
| } else { |
| printk(KERN_ERR "ACPI does not support this state: %d\n", |
| pm_state); |
| error = -ENOSYS; |
| } |
| return error; |
| } |
| |
| /** |
| * acpi_suspend_enter - Actually enter a sleep state. |
| * @pm_state: ignored |
| * |
| * Flush caches and go to sleep. For STR we have to call arch-specific |
| * assembly, which in turn call acpi_enter_sleep_state(). |
| * It's unfortunate, but it works. Please fix if you're feeling frisky. |
| */ |
| static int acpi_suspend_enter(suspend_state_t pm_state) |
| { |
| acpi_status status = AE_OK; |
| unsigned long flags = 0; |
| u32 acpi_state = acpi_target_sleep_state; |
| |
| ACPI_FLUSH_CPU_CACHE(); |
| |
| /* Do arch specific saving of state. */ |
| if (acpi_state == ACPI_STATE_S3) { |
| int error = acpi_save_state_mem(); |
| |
| if (error) |
| return error; |
| } |
| |
| local_irq_save(flags); |
| switch (acpi_state) { |
| case ACPI_STATE_S1: |
| barrier(); |
| status = acpi_enter_sleep_state(acpi_state); |
| break; |
| |
| case ACPI_STATE_S3: |
| do_suspend_lowlevel(); |
| break; |
| } |
| |
| /* This violates the spec but is required for bug compatibility. */ |
| acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); |
| |
| /* Reprogram control registers and execute _BFS */ |
| acpi_leave_sleep_state_prep(acpi_state); |
| |
| /* ACPI 3.0 specs (P62) says that it's the responsibility |
| * of the OSPM to clear the status bit [ implying that the |
| * POWER_BUTTON event should not reach userspace ] |
| */ |
| if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) |
| acpi_clear_event(ACPI_EVENT_POWER_BUTTON); |
| |
| /* |
| * Disable and clear GPE status before interrupt is enabled. Some GPEs |
| * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. |
| * acpi_leave_sleep_state will reenable specific GPEs later |
| */ |
| acpi_disable_all_gpes(); |
| /* Allow EC transactions to happen. */ |
| acpi_ec_unblock_transactions_early(); |
| |
| local_irq_restore(flags); |
| printk(KERN_DEBUG "Back to C!\n"); |
| |
| /* restore processor state */ |
| if (acpi_state == ACPI_STATE_S3) |
| acpi_restore_state_mem(); |
| |
| suspend_nvs_restore(); |
| |
| return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
| } |
| |
| static void acpi_suspend_finish(void) |
| { |
| acpi_pm_finish(); |
| } |
| |
| static int acpi_suspend_state_valid(suspend_state_t pm_state) |
| { |
| u32 acpi_state; |
| |
| switch (pm_state) { |
| case PM_SUSPEND_ON: |
| case PM_SUSPEND_STANDBY: |
| case PM_SUSPEND_MEM: |
| acpi_state = acpi_suspend_states[pm_state]; |
| |
| return sleep_states[acpi_state]; |
| default: |
| return 0; |
| } |
| } |
| |
| static struct platform_suspend_ops acpi_suspend_ops = { |
| .valid = acpi_suspend_state_valid, |
| .begin = acpi_suspend_begin, |
| .prepare_late = acpi_pm_prepare, |
| .enter = acpi_suspend_enter, |
| .wake = acpi_suspend_finish, |
| .end = acpi_pm_end, |
| }; |
| |
| /** |
| * acpi_suspend_begin_old - Set the target system sleep state to the |
| * state associated with given @pm_state, if supported, and |
| * execute the _PTS control method. This function is used if the |
| * pre-ACPI 2.0 suspend ordering has been requested. |
| */ |
| static int acpi_suspend_begin_old(suspend_state_t pm_state) |
| { |
| int error = acpi_suspend_begin(pm_state); |
| |
| if (!error) |
| error = __acpi_pm_prepare(); |
| return error; |
| } |
| |
| /* |
| * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has |
| * been requested. |
| */ |
| static struct platform_suspend_ops acpi_suspend_ops_old = { |
| .valid = acpi_suspend_state_valid, |
| .begin = acpi_suspend_begin_old, |
| .prepare_late = acpi_pm_freeze, |
| .enter = acpi_suspend_enter, |
| .wake = acpi_suspend_finish, |
| .end = acpi_pm_end, |
| .recover = acpi_pm_finish, |
| }; |
| |
| static int __init init_old_suspend_ordering(const struct dmi_system_id *d) |
| { |
| old_suspend_ordering = true; |
| return 0; |
| } |
| |
| static struct dmi_system_id __initdata acpisleep_dmi_table[] = { |
| { |
| .callback = init_old_suspend_ordering, |
| .ident = "Abit KN9 (nForce4 variant)", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), |
| DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), |
| }, |
| }, |
| { |
| .callback = init_old_suspend_ordering, |
| .ident = "HP xw4600 Workstation", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), |
| }, |
| }, |
| { |
| .callback = init_old_suspend_ordering, |
| .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), |
| DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), |
| }, |
| }, |
| { |
| .callback = init_old_suspend_ordering, |
| .ident = "Panasonic CF51-2L", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_VENDOR, |
| "Matsushita Electric Industrial Co.,Ltd."), |
| DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), |
| }, |
| }, |
| {}, |
| }; |
| #endif /* CONFIG_SUSPEND */ |
| |
| #ifdef CONFIG_HIBERNATION |
| /* |
| * The ACPI specification wants us to save NVS memory regions during hibernation |
| * and to restore them during the subsequent resume. However, it is not certain |
| * if this mechanism is going to work on all machines, so we allow the user to |
| * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line |
| * option. |
| */ |
| static bool s4_no_nvs; |
| |
| void __init acpi_s4_no_nvs(void) |
| { |
| s4_no_nvs = true; |
| } |
| |
| static unsigned long s4_hardware_signature; |
| static struct acpi_table_facs *facs; |
| static bool nosigcheck; |
| |
| void __init acpi_no_s4_hw_signature(void) |
| { |
| nosigcheck = true; |
| } |
| |
| static int acpi_hibernation_begin(void) |
| { |
| int error; |
| |
| error = s4_no_nvs ? 0 : suspend_nvs_alloc(); |
| if (!error) { |
| acpi_target_sleep_state = ACPI_STATE_S4; |
| acpi_sleep_tts_switch(acpi_target_sleep_state); |
| } |
| |
| return error; |
| } |
| |
| static int acpi_hibernation_pre_snapshot(void) |
| { |
| int error = acpi_pm_prepare(); |
| |
| if (!error) |
| suspend_nvs_save(); |
| |
| return error; |
| } |
| |
| static int acpi_hibernation_enter(void) |
| { |
| acpi_status status = AE_OK; |
| unsigned long flags = 0; |
| |
| ACPI_FLUSH_CPU_CACHE(); |
| |
| local_irq_save(flags); |
| /* This shouldn't return. If it returns, we have a problem */ |
| status = acpi_enter_sleep_state(ACPI_STATE_S4); |
| /* Reprogram control registers and execute _BFS */ |
| acpi_leave_sleep_state_prep(ACPI_STATE_S4); |
| local_irq_restore(flags); |
| |
| return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
| } |
| |
| static void acpi_hibernation_leave(void) |
| { |
| /* |
| * If ACPI is not enabled by the BIOS and the boot kernel, we need to |
| * enable it here. |
| */ |
| acpi_enable(); |
| /* Reprogram control registers and execute _BFS */ |
| acpi_leave_sleep_state_prep(ACPI_STATE_S4); |
| /* Check the hardware signature */ |
| if (facs && s4_hardware_signature != facs->hardware_signature) { |
| printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " |
| "cannot resume!\n"); |
| panic("ACPI S4 hardware signature mismatch"); |
| } |
| /* Restore the NVS memory area */ |
| suspend_nvs_restore(); |
| /* Allow EC transactions to happen. */ |
| acpi_ec_unblock_transactions_early(); |
| } |
| |
| static void acpi_pm_thaw(void) |
| { |
| acpi_ec_unblock_transactions(); |
| acpi_enable_all_runtime_gpes(); |
| } |
| |
| static struct platform_hibernation_ops acpi_hibernation_ops = { |
| .begin = acpi_hibernation_begin, |
| .end = acpi_pm_end, |
| .pre_snapshot = acpi_hibernation_pre_snapshot, |
| .finish = acpi_pm_finish, |
| .prepare = acpi_pm_prepare, |
| .enter = acpi_hibernation_enter, |
| .leave = acpi_hibernation_leave, |
| .pre_restore = acpi_pm_freeze, |
| .restore_cleanup = acpi_pm_thaw, |
| }; |
| |
| /** |
| * acpi_hibernation_begin_old - Set the target system sleep state to |
| * ACPI_STATE_S4 and execute the _PTS control method. This |
| * function is used if the pre-ACPI 2.0 suspend ordering has been |
| * requested. |
| */ |
| static int acpi_hibernation_begin_old(void) |
| { |
| int error; |
| /* |
| * The _TTS object should always be evaluated before the _PTS object. |
| * When the old_suspended_ordering is true, the _PTS object is |
| * evaluated in the acpi_sleep_prepare. |
| */ |
| acpi_sleep_tts_switch(ACPI_STATE_S4); |
| |
| error = acpi_sleep_prepare(ACPI_STATE_S4); |
| |
| if (!error) { |
| if (!s4_no_nvs) |
| error = suspend_nvs_alloc(); |
| if (!error) |
| acpi_target_sleep_state = ACPI_STATE_S4; |
| } |
| return error; |
| } |
| |
| static int acpi_hibernation_pre_snapshot_old(void) |
| { |
| acpi_pm_freeze(); |
| suspend_nvs_save(); |
| return 0; |
| } |
| |
| /* |
| * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has |
| * been requested. |
| */ |
| static struct platform_hibernation_ops acpi_hibernation_ops_old = { |
| .begin = acpi_hibernation_begin_old, |
| .end = acpi_pm_end, |
| .pre_snapshot = acpi_hibernation_pre_snapshot_old, |
| .prepare = acpi_pm_freeze, |
| .finish = acpi_pm_finish, |
| .enter = acpi_hibernation_enter, |
| .leave = acpi_hibernation_leave, |
| .pre_restore = acpi_pm_freeze, |
| .restore_cleanup = acpi_pm_thaw, |
| .recover = acpi_pm_finish, |
| }; |
| #endif /* CONFIG_HIBERNATION */ |
| |
| int acpi_suspend(u32 acpi_state) |
| { |
| suspend_state_t states[] = { |
| [1] = PM_SUSPEND_STANDBY, |
| [3] = PM_SUSPEND_MEM, |
| [5] = PM_SUSPEND_MAX |
| }; |
| |
| if (acpi_state < 6 && states[acpi_state]) |
| return pm_suspend(states[acpi_state]); |
| if (acpi_state == 4) |
| return hibernate(); |
| return -EINVAL; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| /** |
| * acpi_pm_device_sleep_state - return preferred power state of ACPI device |
| * in the system sleep state given by %acpi_target_sleep_state |
| * @dev: device to examine; its driver model wakeup flags control |
| * whether it should be able to wake up the system |
| * @d_min_p: used to store the upper limit of allowed states range |
| * Return value: preferred power state of the device on success, -ENODEV on |
| * failure (ie. if there's no 'struct acpi_device' for @dev) |
| * |
| * Find the lowest power (highest number) ACPI device power state that |
| * device @dev can be in while the system is in the sleep state represented |
| * by %acpi_target_sleep_state. If @wake is nonzero, the device should be |
| * able to wake up the system from this sleep state. If @d_min_p is set, |
| * the highest power (lowest number) device power state of @dev allowed |
| * in this system sleep state is stored at the location pointed to by it. |
| * |
| * The caller must ensure that @dev is valid before using this function. |
| * The caller is also responsible for figuring out if the device is |
| * supposed to be able to wake up the system and passing this information |
| * via @wake. |
| */ |
| |
| int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) |
| { |
| acpi_handle handle = DEVICE_ACPI_HANDLE(dev); |
| struct acpi_device *adev; |
| char acpi_method[] = "_SxD"; |
| unsigned long long d_min, d_max; |
| |
| if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { |
| printk(KERN_DEBUG "ACPI handle has no context!\n"); |
| return -ENODEV; |
| } |
| |
| acpi_method[2] = '0' + acpi_target_sleep_state; |
| /* |
| * If the sleep state is S0, we will return D3, but if the device has |
| * _S0W, we will use the value from _S0W |
| */ |
| d_min = ACPI_STATE_D0; |
| d_max = ACPI_STATE_D3; |
| |
| /* |
| * If present, _SxD methods return the minimum D-state (highest power |
| * state) we can use for the corresponding S-states. Otherwise, the |
| * minimum D-state is D0 (ACPI 3.x). |
| * |
| * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer |
| * provided -- that's our fault recovery, we ignore retval. |
| */ |
| if (acpi_target_sleep_state > ACPI_STATE_S0) |
| acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); |
| |
| /* |
| * If _PRW says we can wake up the system from the target sleep state, |
| * the D-state returned by _SxD is sufficient for that (we assume a |
| * wakeup-aware driver if wake is set). Still, if _SxW exists |
| * (ACPI 3.x), it should return the maximum (lowest power) D-state that |
| * can wake the system. _S0W may be valid, too. |
| */ |
| if (acpi_target_sleep_state == ACPI_STATE_S0 || |
| (device_may_wakeup(dev) && adev->wakeup.state.enabled && |
| adev->wakeup.sleep_state <= acpi_target_sleep_state)) { |
| acpi_status status; |
| |
| acpi_method[3] = 'W'; |
| status = acpi_evaluate_integer(handle, acpi_method, NULL, |
| &d_max); |
| if (ACPI_FAILURE(status)) { |
| d_max = d_min; |
| } else if (d_max < d_min) { |
| /* Warn the user of the broken DSDT */ |
| printk(KERN_WARNING "ACPI: Wrong value from %s\n", |
| acpi_method); |
| /* Sanitize it */ |
| d_min = d_max; |
| } |
| } |
| |
| if (d_min_p) |
| *d_min_p = d_min; |
| return d_max; |
| } |
| |
| /** |
| * acpi_pm_device_sleep_wake - enable or disable the system wake-up |
| * capability of given device |
| * @dev: device to handle |
| * @enable: 'true' - enable, 'false' - disable the wake-up capability |
| */ |
| int acpi_pm_device_sleep_wake(struct device *dev, bool enable) |
| { |
| acpi_handle handle; |
| struct acpi_device *adev; |
| int error; |
| |
| if (!device_can_wakeup(dev)) |
| return -EINVAL; |
| |
| handle = DEVICE_ACPI_HANDLE(dev); |
| if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { |
| dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); |
| return -ENODEV; |
| } |
| |
| if (enable) { |
| error = acpi_enable_wakeup_device_power(adev, |
| acpi_target_sleep_state); |
| if (!error) |
| acpi_enable_gpe(adev->wakeup.gpe_device, |
| adev->wakeup.gpe_number, |
| ACPI_GPE_TYPE_WAKE); |
| } else { |
| acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number, |
| ACPI_GPE_TYPE_WAKE); |
| error = acpi_disable_wakeup_device_power(adev); |
| } |
| if (!error) |
| dev_info(dev, "wake-up capability %s by ACPI\n", |
| enable ? "enabled" : "disabled"); |
| |
| return error; |
| } |
| #endif |
| |
| static void acpi_power_off_prepare(void) |
| { |
| /* Prepare to power off the system */ |
| acpi_sleep_prepare(ACPI_STATE_S5); |
| acpi_disable_all_gpes(); |
| } |
| |
| static void acpi_power_off(void) |
| { |
| /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ |
| printk(KERN_DEBUG "%s called\n", __func__); |
| local_irq_disable(); |
| acpi_enter_sleep_state(ACPI_STATE_S5); |
| } |
| |
| /* |
| * ACPI 2.0 created the optional _GTS and _BFS, |
| * but industry adoption has been neither rapid nor broad. |
| * |
| * Linux gets into trouble when it executes poorly validated |
| * paths through the BIOS, so disable _GTS and _BFS by default, |
| * but do speak up and offer the option to enable them. |
| */ |
| void __init acpi_gts_bfs_check(void) |
| { |
| acpi_handle dummy; |
| |
| if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) |
| { |
| printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); |
| printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " |
| "please notify linux-acpi@vger.kernel.org\n"); |
| } |
| if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) |
| { |
| printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); |
| printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " |
| "please notify linux-acpi@vger.kernel.org\n"); |
| } |
| } |
| |
| int __init acpi_sleep_init(void) |
| { |
| acpi_status status; |
| u8 type_a, type_b; |
| #ifdef CONFIG_SUSPEND |
| int i = 0; |
| |
| dmi_check_system(acpisleep_dmi_table); |
| #endif |
| |
| if (acpi_disabled) |
| return 0; |
| |
| sleep_states[ACPI_STATE_S0] = 1; |
| printk(KERN_INFO PREFIX "(supports S0"); |
| |
| #ifdef CONFIG_SUSPEND |
| for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { |
| status = acpi_get_sleep_type_data(i, &type_a, &type_b); |
| if (ACPI_SUCCESS(status)) { |
| sleep_states[i] = 1; |
| printk(" S%d", i); |
| } |
| } |
| |
| suspend_set_ops(old_suspend_ordering ? |
| &acpi_suspend_ops_old : &acpi_suspend_ops); |
| #endif |
| |
| #ifdef CONFIG_HIBERNATION |
| status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); |
| if (ACPI_SUCCESS(status)) { |
| hibernation_set_ops(old_suspend_ordering ? |
| &acpi_hibernation_ops_old : &acpi_hibernation_ops); |
| sleep_states[ACPI_STATE_S4] = 1; |
| printk(" S4"); |
| if (!nosigcheck) { |
| acpi_get_table(ACPI_SIG_FACS, 1, |
| (struct acpi_table_header **)&facs); |
| if (facs) |
| s4_hardware_signature = |
| facs->hardware_signature; |
| } |
| } |
| #endif |
| status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); |
| if (ACPI_SUCCESS(status)) { |
| sleep_states[ACPI_STATE_S5] = 1; |
| printk(" S5"); |
| pm_power_off_prepare = acpi_power_off_prepare; |
| pm_power_off = acpi_power_off; |
| } |
| printk(")\n"); |
| /* |
| * Register the tts_notifier to reboot notifier list so that the _TTS |
| * object can also be evaluated when the system enters S5. |
| */ |
| register_reboot_notifier(&tts_notifier); |
| acpi_gts_bfs_check(); |
| return 0; |
| } |