summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/sleep.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/sleep.c')
-rw-r--r--drivers/acpi/sleep.c1134
1 files changed, 1134 insertions, 0 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
new file mode 100644
index 0000000000..808484d112
--- /dev/null
+++ b/drivers/acpi/sleep.c
@@ -0,0 +1,1134 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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
+ */
+
+#define pr_fmt(fmt) "ACPI: PM: " fmt
+
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/dmi.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/suspend.h>
+#include <linux/reboot.h>
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/syscore_ops.h>
+#include <asm/io.h>
+#include <trace/events/power.h>
+
+#include "internal.h"
+#include "sleep.h"
+
+/*
+ * Some HW-full platforms do not have _S5, so they may need
+ * to leverage efi power off for a shutdown.
+ */
+bool acpi_no_s5;
+static u8 sleep_states[ACPI_S_STATE_COUNT];
+
+static void acpi_sleep_tts_switch(u32 acpi_state)
+{
+ acpi_status status;
+
+ status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
+ 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.
+ */
+ pr_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,
+};
+
+#ifndef acpi_skip_set_wakeup_address
+#define acpi_skip_set_wakeup_address() false
+#endif
+
+static int acpi_sleep_prepare(u32 acpi_state)
+{
+#ifdef CONFIG_ACPI_SLEEP
+ unsigned long acpi_wakeup_address;
+
+ /* do we have a wakeup address for S2 and S3? */
+ if (acpi_state == ACPI_STATE_S3 && !acpi_skip_set_wakeup_address()) {
+ acpi_wakeup_address = acpi_get_wakeup_address();
+ if (!acpi_wakeup_address)
+ return -EFAULT;
+ acpi_set_waking_vector(acpi_wakeup_address);
+
+ }
+#endif
+ pr_info("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;
+}
+
+bool acpi_sleep_state_supported(u8 sleep_state)
+{
+ acpi_status status;
+ u8 type_a, type_b;
+
+ status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
+ return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
+ || (acpi_gbl_FADT.sleep_control.address
+ && acpi_gbl_FADT.sleep_status.address));
+}
+
+#ifdef CONFIG_ACPI_SLEEP
+static u32 acpi_target_sleep_state = ACPI_STATE_S0;
+
+u32 acpi_target_system_state(void)
+{
+ return acpi_target_sleep_state;
+}
+EXPORT_SYMBOL_GPL(acpi_target_system_state);
+
+static bool pwr_btn_event_pending;
+
+/*
+ * The ACPI specification wants us to save NVS memory regions during hibernation
+ * and to restore them during the subsequent resume. Windows does that also for
+ * suspend to RAM. However, it is known that this mechanism does not work on
+ * all machines, so we allow the user to disable it with the help of the
+ * 'acpi_sleep=nonvs' kernel command line option.
+ */
+static bool nvs_nosave;
+
+void __init acpi_nvs_nosave(void)
+{
+ nvs_nosave = true;
+}
+
+/*
+ * The ACPI specification wants us to save NVS memory regions during hibernation
+ * but says nothing about saving NVS during S3. Not all versions of Windows
+ * save NVS on S3 suspend either, and it is clear that not all systems need
+ * NVS to be saved at S3 time. To improve suspend/resume time, allow the
+ * user to disable saving NVS on S3 if their system does not require it, but
+ * continue to save/restore NVS for S4 as specified.
+ */
+static bool nvs_nosave_s3;
+
+void __init acpi_nvs_nosave_s3(void)
+{
+ nvs_nosave_s3 = true;
+}
+
+static int __init init_nvs_save_s3(const struct dmi_system_id *d)
+{
+ nvs_nosave_s3 = false;
+ return 0;
+}
+
+/*
+ * 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;
+}
+
+static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
+{
+ acpi_old_suspend_ordering();
+ return 0;
+}
+
+static int __init init_nvs_nosave(const struct dmi_system_id *d)
+{
+ acpi_nvs_nosave();
+ return 0;
+}
+
+bool acpi_sleep_default_s3;
+
+static int __init init_default_s3(const struct dmi_system_id *d)
+{
+ acpi_sleep_default_s3 = true;
+ return 0;
+}
+
+static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
+ {
+ .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"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VGN-FW41E_H",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VGN-FW21E",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VGN-FW21M",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VPCEB17FX",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VGN-SR11M",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Everex StepNote Series",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VPCEB1Z1E",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VGN-NW130D",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VPCCW29FX",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Averatec AV1020-ED2",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
+ },
+ },
+ {
+ .callback = init_old_suspend_ordering,
+ .ident = "Asus A8N-SLI DELUXE",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
+ DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
+ },
+ },
+ {
+ .callback = init_old_suspend_ordering,
+ .ident = "Asus A8N-SLI Premium",
+ .matches = {
+ DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
+ DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VGN-SR26GN_P",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VPCEB1S1E",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Sony Vaio VGN-FW520F",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Asus K54C",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
+ },
+ },
+ {
+ .callback = init_nvs_nosave,
+ .ident = "Asus K54HR",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
+ },
+ },
+ {
+ .callback = init_nvs_save_s3,
+ .ident = "Asus 1025C",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
+ },
+ },
+ /*
+ * https://bugzilla.kernel.org/show_bug.cgi?id=189431
+ * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
+ * saving during S3.
+ */
+ {
+ .callback = init_nvs_save_s3,
+ .ident = "Lenovo G50-45",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
+ },
+ },
+ {
+ .callback = init_nvs_save_s3,
+ .ident = "Lenovo G40-45",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
+ },
+ },
+ /*
+ * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
+ * the Low Power S0 Idle firmware interface (see
+ * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
+ */
+ {
+ .callback = init_default_s3,
+ .ident = "ThinkPad X1 Tablet(2016)",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
+ },
+ },
+ /*
+ * ASUS B1400CEAE hangs on resume from suspend (see
+ * https://bugzilla.kernel.org/show_bug.cgi?id=215742).
+ */
+ {
+ .callback = init_default_s3,
+ .ident = "ASUS B1400CEAE",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "ASUS EXPERTBOOK B1400CEAE"),
+ },
+ },
+ {},
+};
+
+static bool ignore_blacklist;
+
+void __init acpi_sleep_no_blacklist(void)
+{
+ ignore_blacklist = true;
+}
+
+static void __init acpi_sleep_dmi_check(void)
+{
+ if (ignore_blacklist)
+ return;
+
+ if (dmi_get_bios_year() >= 2012)
+ acpi_nvs_nosave_s3();
+
+ dmi_check_system(acpisleep_dmi_table);
+}
+
+/**
+ * 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();
+ acpi_ec_block_transactions();
+ return 0;
+}
+
+/**
+ * acpi_pm_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
+ */
+static int acpi_pm_pre_suspend(void)
+{
+ acpi_pm_freeze();
+ return suspend_nvs_save();
+}
+
+/**
+ * __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);
+ 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)
+ error = acpi_pm_pre_suspend();
+
+ 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)
+{
+ struct acpi_device *pwr_btn_adev;
+ u32 acpi_state = acpi_target_sleep_state;
+
+ acpi_ec_unblock_transactions();
+ suspend_nvs_free();
+
+ if (acpi_state == ACPI_STATE_S0)
+ return;
+
+ pr_info("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_waking_vector(0);
+
+ acpi_target_sleep_state = ACPI_STATE_S0;
+
+ acpi_resume_power_resources();
+
+ /* If we were woken with the fixed power button, provide a small
+ * hint to userspace in the form of a wakeup event on the fixed power
+ * button device (if it can be found).
+ *
+ * We delay the event generation til now, as the PM layer requires
+ * timekeeping to be running before we generate events. */
+ if (!pwr_btn_event_pending)
+ return;
+
+ pwr_btn_event_pending = false;
+ pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
+ NULL, -1);
+ if (pwr_btn_adev) {
+ pm_wakeup_event(&pwr_btn_adev->dev, 0);
+ acpi_dev_put(pwr_btn_adev);
+ }
+}
+
+/**
+ * acpi_pm_start - Start system PM transition.
+ */
+static void acpi_pm_start(u32 acpi_state)
+{
+ acpi_target_sleep_state = acpi_state;
+ acpi_sleep_tts_switch(acpi_target_sleep_state);
+ acpi_scan_lock_acquire();
+}
+
+/**
+ * acpi_pm_end - Finish up system PM transition.
+ */
+static void acpi_pm_end(void)
+{
+ acpi_turn_off_unused_power_resources();
+ acpi_scan_lock_release();
+ /*
+ * 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 sleep_no_lps0 (1)
+#define acpi_target_sleep_state ACPI_STATE_S0
+#define acpi_sleep_default_s3 (1)
+static inline void acpi_sleep_dmi_check(void) {}
+#endif /* CONFIG_ACPI_SLEEP */
+
+#ifdef CONFIG_SUSPEND
+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;
+
+ error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
+ if (error)
+ return error;
+
+ if (!sleep_states[acpi_state]) {
+ pr_err("ACPI does not support sleep state S%u\n", acpi_state);
+ return -ENOSYS;
+ }
+ if (acpi_state > ACPI_STATE_S1)
+ pm_set_suspend_via_firmware();
+
+ acpi_pm_start(acpi_state);
+ return 0;
+}
+
+/**
+ * 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;
+ u32 acpi_state = acpi_target_sleep_state;
+ int error;
+
+ trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
+ switch (acpi_state) {
+ case ACPI_STATE_S1:
+ barrier();
+ status = acpi_enter_sleep_state(acpi_state);
+ break;
+
+ case ACPI_STATE_S3:
+ if (!acpi_suspend_lowlevel)
+ return -ENOSYS;
+ error = acpi_suspend_lowlevel();
+ if (error)
+ return error;
+ pr_info("Low-level resume complete\n");
+ pm_set_resume_via_firmware();
+ break;
+ }
+ trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
+
+ /* This violates the spec but is required for bug compatibility. */
+ acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
+
+ /* Reprogram control registers */
+ 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 ]
+ *
+ * However, we do generate a small hint for userspace in the form of
+ * a wakeup event. We flag this condition for now and generate the
+ * event later, as we're currently too early in resume to be able to
+ * generate wakeup events.
+ */
+ if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
+ acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
+
+ acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
+
+ if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
+ acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
+ /* Flag for later */
+ pwr_btn_event_pending = true;
+ }
+ }
+
+ /*
+ * Disable all GPE and clear their status bits before interrupts are
+ * enabled. Some GPEs (like wakeup GPEs) have no handlers and this can
+ * prevent them from producing spurious interrups.
+ *
+ * acpi_leave_sleep_state() will reenable specific GPEs later.
+ *
+ * Because this code runs on one CPU with disabled interrupts (all of
+ * the other CPUs are offline at this time), it need not acquire any
+ * sleeping locks which may trigger an implicit preemption point even
+ * if there is no contention, so avoid doing that by using a low-level
+ * library routine here.
+ */
+ acpi_hw_disable_all_gpes();
+ /* Allow EC transactions to happen. */
+ acpi_ec_unblock_transactions();
+
+ suspend_nvs_restore();
+
+ return ACPI_SUCCESS(status) ? 0 : -EFAULT;
+}
+
+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 const 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_pm_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 const struct platform_suspend_ops acpi_suspend_ops_old = {
+ .valid = acpi_suspend_state_valid,
+ .begin = acpi_suspend_begin_old,
+ .prepare_late = acpi_pm_pre_suspend,
+ .enter = acpi_suspend_enter,
+ .wake = acpi_pm_finish,
+ .end = acpi_pm_end,
+ .recover = acpi_pm_finish,
+};
+
+static bool s2idle_wakeup;
+
+int acpi_s2idle_begin(void)
+{
+ acpi_scan_lock_acquire();
+ return 0;
+}
+
+int acpi_s2idle_prepare(void)
+{
+ if (acpi_sci_irq_valid()) {
+ int error;
+
+ error = enable_irq_wake(acpi_sci_irq);
+ if (error)
+ pr_warn("Warning: Failed to enable wakeup from IRQ %d: %d\n",
+ acpi_sci_irq, error);
+
+ acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
+ }
+
+ acpi_enable_wakeup_devices(ACPI_STATE_S0);
+
+ /* Change the configuration of GPEs to avoid spurious wakeup. */
+ acpi_enable_all_wakeup_gpes();
+ acpi_os_wait_events_complete();
+
+ s2idle_wakeup = true;
+ return 0;
+}
+
+bool acpi_s2idle_wake(void)
+{
+ if (!acpi_sci_irq_valid())
+ return pm_wakeup_pending();
+
+ while (pm_wakeup_pending()) {
+ /*
+ * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
+ * SCI has not triggered while suspended, so bail out (the
+ * wakeup is pending anyway and the SCI is not the source of
+ * it).
+ */
+ if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
+ pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
+ return true;
+ }
+
+ /*
+ * If the status bit of any enabled fixed event is set, the
+ * wakeup is regarded as valid.
+ */
+ if (acpi_any_fixed_event_status_set()) {
+ pm_pr_dbg("ACPI fixed event wakeup\n");
+ return true;
+ }
+
+ /* Check wakeups from drivers sharing the SCI. */
+ if (acpi_check_wakeup_handlers()) {
+ pm_pr_dbg("ACPI custom handler wakeup\n");
+ return true;
+ }
+
+ /*
+ * Check non-EC GPE wakeups and if there are none, cancel the
+ * SCI-related wakeup and dispatch the EC GPE.
+ */
+ if (acpi_ec_dispatch_gpe()) {
+ pm_pr_dbg("ACPI non-EC GPE wakeup\n");
+ return true;
+ }
+
+ acpi_os_wait_events_complete();
+
+ /*
+ * The SCI is in the "suspended" state now and it cannot produce
+ * new wakeup events till the rearming below, so if any of them
+ * are pending here, they must be resulting from the processing
+ * of EC events above or coming from somewhere else.
+ */
+ if (pm_wakeup_pending()) {
+ pm_pr_dbg("Wakeup after ACPI Notify sync\n");
+ return true;
+ }
+
+ pm_pr_dbg("Rearming ACPI SCI for wakeup\n");
+
+ pm_wakeup_clear(acpi_sci_irq);
+ rearm_wake_irq(acpi_sci_irq);
+ }
+
+ return false;
+}
+
+void acpi_s2idle_restore(void)
+{
+ /*
+ * Drain pending events before restoring the working-state configuration
+ * of GPEs.
+ */
+ acpi_os_wait_events_complete(); /* synchronize GPE processing */
+ acpi_ec_flush_work(); /* flush the EC driver's workqueues */
+ acpi_os_wait_events_complete(); /* synchronize Notify handling */
+
+ s2idle_wakeup = false;
+
+ acpi_enable_all_runtime_gpes();
+
+ acpi_disable_wakeup_devices(ACPI_STATE_S0);
+
+ if (acpi_sci_irq_valid()) {
+ acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
+ disable_irq_wake(acpi_sci_irq);
+ }
+}
+
+void acpi_s2idle_end(void)
+{
+ acpi_scan_lock_release();
+}
+
+static const struct platform_s2idle_ops acpi_s2idle_ops = {
+ .begin = acpi_s2idle_begin,
+ .prepare = acpi_s2idle_prepare,
+ .wake = acpi_s2idle_wake,
+ .restore = acpi_s2idle_restore,
+ .end = acpi_s2idle_end,
+};
+
+void __weak acpi_s2idle_setup(void)
+{
+ if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
+ pr_info("Efficient low-power S0 idle declared\n");
+
+ s2idle_set_ops(&acpi_s2idle_ops);
+}
+
+static void __init acpi_sleep_suspend_setup(void)
+{
+ bool suspend_ops_needed = false;
+ int i;
+
+ for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
+ if (acpi_sleep_state_supported(i)) {
+ sleep_states[i] = 1;
+ suspend_ops_needed = true;
+ }
+
+ if (suspend_ops_needed)
+ suspend_set_ops(old_suspend_ordering ?
+ &acpi_suspend_ops_old : &acpi_suspend_ops);
+
+ acpi_s2idle_setup();
+}
+
+#else /* !CONFIG_SUSPEND */
+#define s2idle_wakeup (false)
+static inline void acpi_sleep_suspend_setup(void) {}
+#endif /* !CONFIG_SUSPEND */
+
+bool acpi_s2idle_wakeup(void)
+{
+ return s2idle_wakeup;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static u32 saved_bm_rld;
+
+static int acpi_save_bm_rld(void)
+{
+ acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
+ return 0;
+}
+
+static void acpi_restore_bm_rld(void)
+{
+ u32 resumed_bm_rld = 0;
+
+ acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
+ if (resumed_bm_rld == saved_bm_rld)
+ return;
+
+ acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
+}
+
+static struct syscore_ops acpi_sleep_syscore_ops = {
+ .suspend = acpi_save_bm_rld,
+ .resume = acpi_restore_bm_rld,
+};
+
+static void acpi_sleep_syscore_init(void)
+{
+ register_syscore_ops(&acpi_sleep_syscore_ops);
+}
+#else
+static inline void acpi_sleep_syscore_init(void) {}
+#endif /* CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_HIBERNATION
+static unsigned long s4_hardware_signature;
+static struct acpi_table_facs *facs;
+int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */
+
+static int acpi_hibernation_begin(pm_message_t stage)
+{
+ if (!nvs_nosave) {
+ int error = suspend_nvs_alloc();
+ if (error)
+ return error;
+ }
+
+ if (stage.event == PM_EVENT_HIBERNATE)
+ pm_set_suspend_via_firmware();
+
+ acpi_pm_start(ACPI_STATE_S4);
+ return 0;
+}
+
+static int acpi_hibernation_enter(void)
+{
+ acpi_status status = AE_OK;
+
+ /* This shouldn't return. If it returns, we have a problem */
+ status = acpi_enter_sleep_state(ACPI_STATE_S4);
+ /* Reprogram control registers */
+ acpi_leave_sleep_state_prep(ACPI_STATE_S4);
+
+ return ACPI_SUCCESS(status) ? 0 : -EFAULT;
+}
+
+static void acpi_hibernation_leave(void)
+{
+ pm_set_resume_via_firmware();
+ /*
+ * If ACPI is not enabled by the BIOS and the boot kernel, we need to
+ * enable it here.
+ */
+ acpi_enable();
+ /* Reprogram control registers */
+ acpi_leave_sleep_state_prep(ACPI_STATE_S4);
+ /* Check the hardware signature */
+ if (facs && s4_hardware_signature != facs->hardware_signature)
+ pr_crit("Hardware changed while hibernated, success doubtful!\n");
+ /* Restore the NVS memory area */
+ suspend_nvs_restore();
+ /* Allow EC transactions to happen. */
+ acpi_ec_unblock_transactions();
+}
+
+static void acpi_pm_thaw(void)
+{
+ acpi_ec_unblock_transactions();
+ acpi_enable_all_runtime_gpes();
+}
+
+static const struct platform_hibernation_ops acpi_hibernation_ops = {
+ .begin = acpi_hibernation_begin,
+ .end = acpi_pm_end,
+ .pre_snapshot = acpi_pm_prepare,
+ .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(pm_message_t stage)
+{
+ 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)
+ return error;
+
+ if (!nvs_nosave) {
+ error = suspend_nvs_alloc();
+ if (error)
+ return error;
+ }
+
+ if (stage.event == PM_EVENT_HIBERNATE)
+ pm_set_suspend_via_firmware();
+
+ acpi_target_sleep_state = ACPI_STATE_S4;
+ acpi_scan_lock_acquire();
+ return 0;
+}
+
+/*
+ * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
+ * been requested.
+ */
+static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
+ .begin = acpi_hibernation_begin_old,
+ .end = acpi_pm_end,
+ .pre_snapshot = acpi_pm_pre_suspend,
+ .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,
+};
+
+static void acpi_sleep_hibernate_setup(void)
+{
+ if (!acpi_sleep_state_supported(ACPI_STATE_S4))
+ return;
+
+ hibernation_set_ops(old_suspend_ordering ?
+ &acpi_hibernation_ops_old : &acpi_hibernation_ops);
+ sleep_states[ACPI_STATE_S4] = 1;
+ if (!acpi_check_s4_hw_signature)
+ return;
+
+ acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
+ if (facs) {
+ /*
+ * s4_hardware_signature is the local variable which is just
+ * used to warn about mismatch after we're attempting to
+ * resume (in violation of the ACPI specification.)
+ */
+ s4_hardware_signature = facs->hardware_signature;
+
+ if (acpi_check_s4_hw_signature > 0) {
+ /*
+ * If we're actually obeying the ACPI specification
+ * then the signature is written out as part of the
+ * swsusp header, in order to allow the boot kernel
+ * to gracefully decline to resume.
+ */
+ swsusp_hardware_signature = facs->hardware_signature;
+ }
+ }
+}
+#else /* !CONFIG_HIBERNATION */
+static inline void acpi_sleep_hibernate_setup(void) {}
+#endif /* !CONFIG_HIBERNATION */
+
+static int acpi_power_off_prepare(struct sys_off_data *data)
+{
+ /* Prepare to power off the system */
+ acpi_sleep_prepare(ACPI_STATE_S5);
+ acpi_disable_all_gpes();
+ acpi_os_wait_events_complete();
+ return NOTIFY_DONE;
+}
+
+static int acpi_power_off(struct sys_off_data *data)
+{
+ /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
+ pr_debug("%s called\n", __func__);
+ local_irq_disable();
+ acpi_enter_sleep_state(ACPI_STATE_S5);
+ return NOTIFY_DONE;
+}
+
+int __init acpi_sleep_init(void)
+{
+ char supported[ACPI_S_STATE_COUNT * 3 + 1];
+ char *pos = supported;
+ int i;
+
+ acpi_sleep_dmi_check();
+
+ sleep_states[ACPI_STATE_S0] = 1;
+
+ acpi_sleep_syscore_init();
+ acpi_sleep_suspend_setup();
+ acpi_sleep_hibernate_setup();
+
+ if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
+ sleep_states[ACPI_STATE_S5] = 1;
+
+ register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
+ SYS_OFF_PRIO_FIRMWARE,
+ acpi_power_off_prepare, NULL);
+
+ register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+ SYS_OFF_PRIO_FIRMWARE,
+ acpi_power_off, NULL);
+
+ /*
+ * Windows uses S5 for reboot, so some BIOSes depend on it to
+ * perform proper reboot.
+ */
+ register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
+ SYS_OFF_PRIO_FIRMWARE,
+ acpi_power_off_prepare, NULL);
+ } else {
+ acpi_no_s5 = true;
+ }
+
+ supported[0] = 0;
+ for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
+ if (sleep_states[i])
+ pos += sprintf(pos, " S%d", i);
+ }
+ pr_info("(supports%s)\n", supported);
+
+ /*
+ * 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);
+ return 0;
+}