1d08ca2caSLen Brown /* 2d08ca2caSLen Brown * sleep.c - ACPI sleep support. 3d08ca2caSLen Brown * 4d08ca2caSLen Brown * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> 5d08ca2caSLen Brown * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> 6d08ca2caSLen Brown * Copyright (c) 2000-2003 Patrick Mochel 7d08ca2caSLen Brown * Copyright (c) 2003 Open Source Development Lab 8d08ca2caSLen Brown * 9d08ca2caSLen Brown * This file is released under the GPLv2. 10d08ca2caSLen Brown * 11d08ca2caSLen Brown */ 12d08ca2caSLen Brown 13d08ca2caSLen Brown #include <linux/delay.h> 14d08ca2caSLen Brown #include <linux/irq.h> 15d08ca2caSLen Brown #include <linux/dmi.h> 16d08ca2caSLen Brown #include <linux/device.h> 17a8d46b9eSRafael J. Wysocki #include <linux/interrupt.h> 18d08ca2caSLen Brown #include <linux/suspend.h> 19d08ca2caSLen Brown #include <linux/reboot.h> 20d1ee4335SH. Peter Anvin #include <linux/acpi.h> 21a2ef5c4fSLin Ming #include <linux/module.h> 22504997cfSSudeep Holla #include <linux/syscore_ops.h> 23d08ca2caSLen Brown #include <asm/io.h> 24bb3632c6STodd E Brandt #include <trace/events/power.h> 25d08ca2caSLen Brown 26e60cc7a6SBjorn Helgaas #include "internal.h" 27d08ca2caSLen Brown #include "sleep.h" 28d08ca2caSLen Brown 2913737181SChen Yu /* 3013737181SChen Yu * Some HW-full platforms do not have _S5, so they may need 3113737181SChen Yu * to leverage efi power off for a shutdown. 3213737181SChen Yu */ 3313737181SChen Yu bool acpi_no_s5; 3401eac60bSStephen Hemminger static u8 sleep_states[ACPI_S_STATE_COUNT]; 35d08ca2caSLen Brown 36d08ca2caSLen Brown static void acpi_sleep_tts_switch(u32 acpi_state) 37d08ca2caSLen Brown { 380db98202SJiang Liu acpi_status status; 39d08ca2caSLen Brown 400db98202SJiang Liu status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state); 41d08ca2caSLen Brown if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 42d08ca2caSLen Brown /* 43d08ca2caSLen Brown * OS can't evaluate the _TTS object correctly. Some warning 44d08ca2caSLen Brown * message will be printed. But it won't break anything. 45d08ca2caSLen Brown */ 46d08ca2caSLen Brown printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); 47d08ca2caSLen Brown } 48d08ca2caSLen Brown } 49d08ca2caSLen Brown 509713adc2SRafael J. Wysocki static int tts_notify_reboot(struct notifier_block *this, 51d08ca2caSLen Brown unsigned long code, void *x) 52d08ca2caSLen Brown { 53d08ca2caSLen Brown acpi_sleep_tts_switch(ACPI_STATE_S5); 54d08ca2caSLen Brown return NOTIFY_DONE; 55d08ca2caSLen Brown } 56d08ca2caSLen Brown 579713adc2SRafael J. Wysocki static struct notifier_block tts_notifier = { 589713adc2SRafael J. Wysocki .notifier_call = tts_notify_reboot, 59d08ca2caSLen Brown .next = NULL, 60d08ca2caSLen Brown .priority = 0, 61d08ca2caSLen Brown }; 62d08ca2caSLen Brown 63d08ca2caSLen Brown static int acpi_sleep_prepare(u32 acpi_state) 64d08ca2caSLen Brown { 65d08ca2caSLen Brown #ifdef CONFIG_ACPI_SLEEP 66d08ca2caSLen Brown /* do we have a wakeup address for S2 and S3? */ 67d08ca2caSLen Brown if (acpi_state == ACPI_STATE_S3) { 68319b6ffcSH. Peter Anvin if (!acpi_wakeup_address) 69d08ca2caSLen Brown return -EFAULT; 70e3e9b577SRafael J. Wysocki acpi_set_waking_vector(acpi_wakeup_address); 71d08ca2caSLen Brown 72d08ca2caSLen Brown } 73d08ca2caSLen Brown ACPI_FLUSH_CPU_CACHE(); 74d08ca2caSLen Brown #endif 75d08ca2caSLen Brown printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", 76d08ca2caSLen Brown acpi_state); 7778f5f023SRafael J. Wysocki acpi_enable_wakeup_devices(acpi_state); 78d08ca2caSLen Brown acpi_enter_sleep_state_prep(acpi_state); 79d08ca2caSLen Brown return 0; 80d08ca2caSLen Brown } 81d08ca2caSLen Brown 82a4e90bedSRafael J. Wysocki static bool acpi_sleep_state_supported(u8 sleep_state) 83a4e90bedSRafael J. Wysocki { 84a4e90bedSRafael J. Wysocki acpi_status status; 85a4e90bedSRafael J. Wysocki u8 type_a, type_b; 86a4e90bedSRafael J. Wysocki 87a4e90bedSRafael J. Wysocki status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b); 88a4e90bedSRafael J. Wysocki return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware 89a4e90bedSRafael J. Wysocki || (acpi_gbl_FADT.sleep_control.address 90a4e90bedSRafael J. Wysocki && acpi_gbl_FADT.sleep_status.address)); 91a4e90bedSRafael J. Wysocki } 92a4e90bedSRafael J. Wysocki 93d08ca2caSLen Brown #ifdef CONFIG_ACPI_SLEEP 94091aad6aSJan Beulich static u32 acpi_target_sleep_state = ACPI_STATE_S0; 95a6ae7594SRafael J. Wysocki 96a6ae7594SRafael J. Wysocki u32 acpi_target_system_state(void) 97a6ae7594SRafael J. Wysocki { 98a6ae7594SRafael J. Wysocki return acpi_target_sleep_state; 99a6ae7594SRafael J. Wysocki } 100fad16dd9SRafael J. Wysocki EXPORT_SYMBOL_GPL(acpi_target_system_state); 101a6ae7594SRafael J. Wysocki 102a5ca7345SRafael J. Wysocki static bool pwr_btn_event_pending; 103091aad6aSJan Beulich 104d7f0eea9SZhang Rui /* 10572ad5d77SRafael J. Wysocki * The ACPI specification wants us to save NVS memory regions during hibernation 10672ad5d77SRafael J. Wysocki * and to restore them during the subsequent resume. Windows does that also for 10772ad5d77SRafael J. Wysocki * suspend to RAM. However, it is known that this mechanism does not work on 10872ad5d77SRafael J. Wysocki * all machines, so we allow the user to disable it with the help of the 10972ad5d77SRafael J. Wysocki * 'acpi_sleep=nonvs' kernel command line option. 11072ad5d77SRafael J. Wysocki */ 11172ad5d77SRafael J. Wysocki static bool nvs_nosave; 11272ad5d77SRafael J. Wysocki 11372ad5d77SRafael J. Wysocki void __init acpi_nvs_nosave(void) 11472ad5d77SRafael J. Wysocki { 11572ad5d77SRafael J. Wysocki nvs_nosave = true; 11672ad5d77SRafael J. Wysocki } 11772ad5d77SRafael J. Wysocki 11872ad5d77SRafael J. Wysocki /* 1191bad2f19SKristen Carlson Accardi * The ACPI specification wants us to save NVS memory regions during hibernation 1201bad2f19SKristen Carlson Accardi * but says nothing about saving NVS during S3. Not all versions of Windows 1211bad2f19SKristen Carlson Accardi * save NVS on S3 suspend either, and it is clear that not all systems need 1221bad2f19SKristen Carlson Accardi * NVS to be saved at S3 time. To improve suspend/resume time, allow the 1231bad2f19SKristen Carlson Accardi * user to disable saving NVS on S3 if their system does not require it, but 1241bad2f19SKristen Carlson Accardi * continue to save/restore NVS for S4 as specified. 1251bad2f19SKristen Carlson Accardi */ 1261bad2f19SKristen Carlson Accardi static bool nvs_nosave_s3; 1271bad2f19SKristen Carlson Accardi 1281bad2f19SKristen Carlson Accardi void __init acpi_nvs_nosave_s3(void) 1291bad2f19SKristen Carlson Accardi { 1301bad2f19SKristen Carlson Accardi nvs_nosave_s3 = true; 1311bad2f19SKristen Carlson Accardi } 1321bad2f19SKristen Carlson Accardi 133cbc00c13SZhang Rui static int __init init_nvs_save_s3(const struct dmi_system_id *d) 134cbc00c13SZhang Rui { 135cbc00c13SZhang Rui nvs_nosave_s3 = false; 136cbc00c13SZhang Rui return 0; 137cbc00c13SZhang Rui } 138cbc00c13SZhang Rui 1391bad2f19SKristen Carlson Accardi /* 140d08ca2caSLen Brown * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the 141d08ca2caSLen Brown * user to request that behavior by using the 'acpi_old_suspend_ordering' 142d08ca2caSLen Brown * kernel command line option that causes the following variable to be set. 143d08ca2caSLen Brown */ 144d08ca2caSLen Brown static bool old_suspend_ordering; 145d08ca2caSLen Brown 146d08ca2caSLen Brown void __init acpi_old_suspend_ordering(void) 147d08ca2caSLen Brown { 148d08ca2caSLen Brown old_suspend_ordering = true; 149d08ca2caSLen Brown } 150d08ca2caSLen Brown 151d08ca2caSLen Brown static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 152d08ca2caSLen Brown { 1530ac1b1d7SZhang Rui acpi_old_suspend_ordering(); 154d08ca2caSLen Brown return 0; 155d08ca2caSLen Brown } 156d08ca2caSLen Brown 15753998648SRafael J. Wysocki static int __init init_nvs_nosave(const struct dmi_system_id *d) 15853998648SRafael J. Wysocki { 15953998648SRafael J. Wysocki acpi_nvs_nosave(); 16053998648SRafael J. Wysocki return 0; 16153998648SRafael J. Wysocki } 16253998648SRafael J. Wysocki 1633e4376ffSSachin Kamat static struct dmi_system_id acpisleep_dmi_table[] __initdata = { 164d08ca2caSLen Brown { 165d08ca2caSLen Brown .callback = init_old_suspend_ordering, 166d08ca2caSLen Brown .ident = "Abit KN9 (nForce4 variant)", 167d08ca2caSLen Brown .matches = { 168d08ca2caSLen Brown DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 169d08ca2caSLen Brown DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 170d08ca2caSLen Brown }, 171d08ca2caSLen Brown }, 172d08ca2caSLen Brown { 173d08ca2caSLen Brown .callback = init_old_suspend_ordering, 174d08ca2caSLen Brown .ident = "HP xw4600 Workstation", 175d08ca2caSLen Brown .matches = { 176d08ca2caSLen Brown DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 177d08ca2caSLen Brown DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 178d08ca2caSLen Brown }, 179d08ca2caSLen Brown }, 180d08ca2caSLen Brown { 181a1404495SAndy Whitcroft .callback = init_old_suspend_ordering, 182a1404495SAndy Whitcroft .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 183a1404495SAndy Whitcroft .matches = { 184a1404495SAndy Whitcroft DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 185a1404495SAndy Whitcroft DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 186a1404495SAndy Whitcroft }, 187a1404495SAndy Whitcroft }, 18845e77988SZhang Rui { 1892a9ef8e1SZhao Yakui .callback = init_old_suspend_ordering, 1902a9ef8e1SZhao Yakui .ident = "Panasonic CF51-2L", 1912a9ef8e1SZhao Yakui .matches = { 1922a9ef8e1SZhao Yakui DMI_MATCH(DMI_BOARD_VENDOR, 1932a9ef8e1SZhao Yakui "Matsushita Electric Industrial Co.,Ltd."), 1942a9ef8e1SZhao Yakui DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), 1952a9ef8e1SZhao Yakui }, 1962a9ef8e1SZhao Yakui }, 19753998648SRafael J. Wysocki { 19853998648SRafael J. Wysocki .callback = init_nvs_nosave, 19966f2fda9SJoseph Salisbury .ident = "Sony Vaio VGN-FW41E_H", 20066f2fda9SJoseph Salisbury .matches = { 20166f2fda9SJoseph Salisbury DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 20266f2fda9SJoseph Salisbury DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"), 20366f2fda9SJoseph Salisbury }, 20466f2fda9SJoseph Salisbury }, 20566f2fda9SJoseph Salisbury { 20666f2fda9SJoseph Salisbury .callback = init_nvs_nosave, 207d11c78e9SDave Jones .ident = "Sony Vaio VGN-FW21E", 208d11c78e9SDave Jones .matches = { 209d11c78e9SDave Jones DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 210d11c78e9SDave Jones DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), 211d11c78e9SDave Jones }, 212d11c78e9SDave Jones }, 213d11c78e9SDave Jones { 214d11c78e9SDave Jones .callback = init_nvs_nosave, 215469dd1c4SFabio Valentini .ident = "Sony Vaio VGN-FW21M", 216469dd1c4SFabio Valentini .matches = { 217469dd1c4SFabio Valentini DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 218469dd1c4SFabio Valentini DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"), 219469dd1c4SFabio Valentini }, 220469dd1c4SFabio Valentini }, 221469dd1c4SFabio Valentini { 222469dd1c4SFabio Valentini .callback = init_nvs_nosave, 223ddf6ce45SDave Jones .ident = "Sony Vaio VPCEB17FX", 224ddf6ce45SDave Jones .matches = { 225ddf6ce45SDave Jones DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 226ddf6ce45SDave Jones DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), 227ddf6ce45SDave Jones }, 228ddf6ce45SDave Jones }, 229ddf6ce45SDave Jones { 230ddf6ce45SDave Jones .callback = init_nvs_nosave, 23153998648SRafael J. Wysocki .ident = "Sony Vaio VGN-SR11M", 23253998648SRafael J. Wysocki .matches = { 23353998648SRafael J. Wysocki DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 23453998648SRafael J. Wysocki DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), 23553998648SRafael J. Wysocki }, 23653998648SRafael J. Wysocki }, 23753998648SRafael J. Wysocki { 23853998648SRafael J. Wysocki .callback = init_nvs_nosave, 23953998648SRafael J. Wysocki .ident = "Everex StepNote Series", 24053998648SRafael J. Wysocki .matches = { 24153998648SRafael J. Wysocki DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), 24253998648SRafael J. Wysocki DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), 24353998648SRafael J. Wysocki }, 24453998648SRafael J. Wysocki }, 245af48931cSRafael J. Wysocki { 246af48931cSRafael J. Wysocki .callback = init_nvs_nosave, 247af48931cSRafael J. Wysocki .ident = "Sony Vaio VPCEB1Z1E", 248af48931cSRafael J. Wysocki .matches = { 249af48931cSRafael J. Wysocki DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 250af48931cSRafael J. Wysocki DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), 251af48931cSRafael J. Wysocki }, 252af48931cSRafael J. Wysocki }, 253291a73c9SRafael J. Wysocki { 254291a73c9SRafael J. Wysocki .callback = init_nvs_nosave, 255291a73c9SRafael J. Wysocki .ident = "Sony Vaio VGN-NW130D", 256291a73c9SRafael J. Wysocki .matches = { 257291a73c9SRafael J. Wysocki DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 258291a73c9SRafael J. Wysocki DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), 259291a73c9SRafael J. Wysocki }, 260291a73c9SRafael J. Wysocki }, 2617b330707SRafael J. Wysocki { 2627b330707SRafael J. Wysocki .callback = init_nvs_nosave, 26393f77084SLan Tianyu .ident = "Sony Vaio VPCCW29FX", 26493f77084SLan Tianyu .matches = { 26593f77084SLan Tianyu DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 26693f77084SLan Tianyu DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), 26793f77084SLan Tianyu }, 26893f77084SLan Tianyu }, 26993f77084SLan Tianyu { 27093f77084SLan Tianyu .callback = init_nvs_nosave, 2717b330707SRafael J. Wysocki .ident = "Averatec AV1020-ED2", 2727b330707SRafael J. Wysocki .matches = { 2737b330707SRafael J. Wysocki DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), 2747b330707SRafael J. Wysocki DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), 2757b330707SRafael J. Wysocki }, 2767b330707SRafael J. Wysocki }, 277bb0c5ed6SZhang Rui { 278bb0c5ed6SZhang Rui .callback = init_old_suspend_ordering, 279bb0c5ed6SZhang Rui .ident = "Asus A8N-SLI DELUXE", 280bb0c5ed6SZhang Rui .matches = { 281bb0c5ed6SZhang Rui DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 282bb0c5ed6SZhang Rui DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), 283bb0c5ed6SZhang Rui }, 284bb0c5ed6SZhang Rui }, 285bb0c5ed6SZhang Rui { 286bb0c5ed6SZhang Rui .callback = init_old_suspend_ordering, 287bb0c5ed6SZhang Rui .ident = "Asus A8N-SLI Premium", 288bb0c5ed6SZhang Rui .matches = { 289bb0c5ed6SZhang Rui DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 290bb0c5ed6SZhang Rui DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), 291bb0c5ed6SZhang Rui }, 292bb0c5ed6SZhang Rui }, 29389e8ea12SRafael J. Wysocki { 29489e8ea12SRafael J. Wysocki .callback = init_nvs_nosave, 29589e8ea12SRafael J. Wysocki .ident = "Sony Vaio VGN-SR26GN_P", 29689e8ea12SRafael J. Wysocki .matches = { 29789e8ea12SRafael J. Wysocki DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 29889e8ea12SRafael J. Wysocki DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), 29989e8ea12SRafael J. Wysocki }, 30089e8ea12SRafael J. Wysocki }, 301731b25a4SBogdan Radulescu { 302731b25a4SBogdan Radulescu .callback = init_nvs_nosave, 303876ab790SLan Tianyu .ident = "Sony Vaio VPCEB1S1E", 304876ab790SLan Tianyu .matches = { 305876ab790SLan Tianyu DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 306876ab790SLan Tianyu DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"), 307876ab790SLan Tianyu }, 308876ab790SLan Tianyu }, 309876ab790SLan Tianyu { 310876ab790SLan Tianyu .callback = init_nvs_nosave, 311731b25a4SBogdan Radulescu .ident = "Sony Vaio VGN-FW520F", 312731b25a4SBogdan Radulescu .matches = { 313731b25a4SBogdan Radulescu DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 314731b25a4SBogdan Radulescu DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), 315731b25a4SBogdan Radulescu }, 316731b25a4SBogdan Radulescu }, 3175a50a7c3SKeng-Yu Lin { 3185a50a7c3SKeng-Yu Lin .callback = init_nvs_nosave, 3195a50a7c3SKeng-Yu Lin .ident = "Asus K54C", 3205a50a7c3SKeng-Yu Lin .matches = { 3215a50a7c3SKeng-Yu Lin DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 3225a50a7c3SKeng-Yu Lin DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), 3235a50a7c3SKeng-Yu Lin }, 3245a50a7c3SKeng-Yu Lin }, 3255a50a7c3SKeng-Yu Lin { 3265a50a7c3SKeng-Yu Lin .callback = init_nvs_nosave, 3275a50a7c3SKeng-Yu Lin .ident = "Asus K54HR", 3285a50a7c3SKeng-Yu Lin .matches = { 3295a50a7c3SKeng-Yu Lin DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 3305a50a7c3SKeng-Yu Lin DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), 3315a50a7c3SKeng-Yu Lin }, 3325a50a7c3SKeng-Yu Lin }, 333cbc00c13SZhang Rui /* 334cbc00c13SZhang Rui * https://bugzilla.kernel.org/show_bug.cgi?id=189431 335cbc00c13SZhang Rui * Lenovo G50-45 is a platform later than 2012, but needs nvs memory 336cbc00c13SZhang Rui * saving during S3. 337cbc00c13SZhang Rui */ 338cbc00c13SZhang Rui { 339cbc00c13SZhang Rui .callback = init_nvs_save_s3, 340cbc00c13SZhang Rui .ident = "Lenovo G50-45", 341cbc00c13SZhang Rui .matches = { 342cbc00c13SZhang Rui DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), 343cbc00c13SZhang Rui DMI_MATCH(DMI_PRODUCT_NAME, "80E3"), 344cbc00c13SZhang Rui }, 345cbc00c13SZhang Rui }, 346d08ca2caSLen Brown {}, 347d08ca2caSLen Brown }; 3480ac1b1d7SZhang Rui 3498b691c9cSJan Beulich static void __init acpi_sleep_dmi_check(void) 3500ac1b1d7SZhang Rui { 351821d6f03SLan Tianyu int year; 352821d6f03SLan Tianyu 353821d6f03SLan Tianyu if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012) 354821d6f03SLan Tianyu acpi_nvs_nosave_s3(); 355821d6f03SLan Tianyu 3560ac1b1d7SZhang Rui dmi_check_system(acpisleep_dmi_table); 3570ac1b1d7SZhang Rui } 3580ac1b1d7SZhang Rui 3590ac1b1d7SZhang Rui /** 3600ac1b1d7SZhang Rui * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. 3610ac1b1d7SZhang Rui */ 3620ac1b1d7SZhang Rui static int acpi_pm_freeze(void) 3630ac1b1d7SZhang Rui { 3640ac1b1d7SZhang Rui acpi_disable_all_gpes(); 3650ac1b1d7SZhang Rui acpi_os_wait_events_complete(); 3660ac1b1d7SZhang Rui acpi_ec_block_transactions(); 3670ac1b1d7SZhang Rui return 0; 3680ac1b1d7SZhang Rui } 3690ac1b1d7SZhang Rui 3700ac1b1d7SZhang Rui /** 3710ac1b1d7SZhang Rui * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. 3720ac1b1d7SZhang Rui */ 3730ac1b1d7SZhang Rui static int acpi_pm_pre_suspend(void) 3740ac1b1d7SZhang Rui { 3750ac1b1d7SZhang Rui acpi_pm_freeze(); 3760ac1b1d7SZhang Rui return suspend_nvs_save(); 3770ac1b1d7SZhang Rui } 3780ac1b1d7SZhang Rui 3790ac1b1d7SZhang Rui /** 3800ac1b1d7SZhang Rui * __acpi_pm_prepare - Prepare the platform to enter the target state. 3810ac1b1d7SZhang Rui * 3820ac1b1d7SZhang Rui * If necessary, set the firmware waking vector and do arch-specific 3830ac1b1d7SZhang Rui * nastiness to get the wakeup code to the waking vector. 3840ac1b1d7SZhang Rui */ 3850ac1b1d7SZhang Rui static int __acpi_pm_prepare(void) 3860ac1b1d7SZhang Rui { 3870ac1b1d7SZhang Rui int error = acpi_sleep_prepare(acpi_target_sleep_state); 3880ac1b1d7SZhang Rui if (error) 3890ac1b1d7SZhang Rui acpi_target_sleep_state = ACPI_STATE_S0; 3900ac1b1d7SZhang Rui 3910ac1b1d7SZhang Rui return error; 3920ac1b1d7SZhang Rui } 3930ac1b1d7SZhang Rui 3940ac1b1d7SZhang Rui /** 3950ac1b1d7SZhang Rui * acpi_pm_prepare - Prepare the platform to enter the target sleep 3960ac1b1d7SZhang Rui * state and disable the GPEs. 3970ac1b1d7SZhang Rui */ 3980ac1b1d7SZhang Rui static int acpi_pm_prepare(void) 3990ac1b1d7SZhang Rui { 4000ac1b1d7SZhang Rui int error = __acpi_pm_prepare(); 4010ac1b1d7SZhang Rui if (!error) 4020ac1b1d7SZhang Rui error = acpi_pm_pre_suspend(); 4030ac1b1d7SZhang Rui 4040ac1b1d7SZhang Rui return error; 4050ac1b1d7SZhang Rui } 4060ac1b1d7SZhang Rui 4070ac1b1d7SZhang Rui static int find_powerf_dev(struct device *dev, void *data) 4080ac1b1d7SZhang Rui { 4090ac1b1d7SZhang Rui struct acpi_device *device = to_acpi_device(dev); 4100ac1b1d7SZhang Rui const char *hid = acpi_device_hid(device); 4110ac1b1d7SZhang Rui 4120ac1b1d7SZhang Rui return !strcmp(hid, ACPI_BUTTON_HID_POWERF); 4130ac1b1d7SZhang Rui } 4140ac1b1d7SZhang Rui 4150ac1b1d7SZhang Rui /** 4160ac1b1d7SZhang Rui * acpi_pm_finish - Instruct the platform to leave a sleep state. 4170ac1b1d7SZhang Rui * 4180ac1b1d7SZhang Rui * This is called after we wake back up (or if entering the sleep state 4190ac1b1d7SZhang Rui * failed). 4200ac1b1d7SZhang Rui */ 4210ac1b1d7SZhang Rui static void acpi_pm_finish(void) 4220ac1b1d7SZhang Rui { 4230ac1b1d7SZhang Rui struct device *pwr_btn_dev; 4240ac1b1d7SZhang Rui u32 acpi_state = acpi_target_sleep_state; 4250ac1b1d7SZhang Rui 4260ac1b1d7SZhang Rui acpi_ec_unblock_transactions(); 4270ac1b1d7SZhang Rui suspend_nvs_free(); 4280ac1b1d7SZhang Rui 4290ac1b1d7SZhang Rui if (acpi_state == ACPI_STATE_S0) 4300ac1b1d7SZhang Rui return; 4310ac1b1d7SZhang Rui 4320ac1b1d7SZhang Rui printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", 4330ac1b1d7SZhang Rui acpi_state); 4340ac1b1d7SZhang Rui acpi_disable_wakeup_devices(acpi_state); 4350ac1b1d7SZhang Rui acpi_leave_sleep_state(acpi_state); 4360ac1b1d7SZhang Rui 4370ac1b1d7SZhang Rui /* reset firmware waking vector */ 438e3e9b577SRafael J. Wysocki acpi_set_waking_vector(0); 4390ac1b1d7SZhang Rui 4400ac1b1d7SZhang Rui acpi_target_sleep_state = ACPI_STATE_S0; 4410ac1b1d7SZhang Rui 442781d737cSRafael J. Wysocki acpi_resume_power_resources(); 443781d737cSRafael J. Wysocki 4440ac1b1d7SZhang Rui /* If we were woken with the fixed power button, provide a small 4450ac1b1d7SZhang Rui * hint to userspace in the form of a wakeup event on the fixed power 4460ac1b1d7SZhang Rui * button device (if it can be found). 4470ac1b1d7SZhang Rui * 4480ac1b1d7SZhang Rui * We delay the event generation til now, as the PM layer requires 4490ac1b1d7SZhang Rui * timekeeping to be running before we generate events. */ 4500ac1b1d7SZhang Rui if (!pwr_btn_event_pending) 4510ac1b1d7SZhang Rui return; 4520ac1b1d7SZhang Rui 4530ac1b1d7SZhang Rui pwr_btn_event_pending = false; 4540ac1b1d7SZhang Rui pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL, 4550ac1b1d7SZhang Rui find_powerf_dev); 4560ac1b1d7SZhang Rui if (pwr_btn_dev) { 4570ac1b1d7SZhang Rui pm_wakeup_event(pwr_btn_dev, 0); 4580ac1b1d7SZhang Rui put_device(pwr_btn_dev); 4590ac1b1d7SZhang Rui } 4600ac1b1d7SZhang Rui } 4610ac1b1d7SZhang Rui 4620ac1b1d7SZhang Rui /** 463ad07277eSRafael J. Wysocki * acpi_pm_start - Start system PM transition. 464ad07277eSRafael J. Wysocki */ 465ad07277eSRafael J. Wysocki static void acpi_pm_start(u32 acpi_state) 466ad07277eSRafael J. Wysocki { 467ad07277eSRafael J. Wysocki acpi_target_sleep_state = acpi_state; 468ad07277eSRafael J. Wysocki acpi_sleep_tts_switch(acpi_target_sleep_state); 469ad07277eSRafael J. Wysocki acpi_scan_lock_acquire(); 470ad07277eSRafael J. Wysocki } 471ad07277eSRafael J. Wysocki 472ad07277eSRafael J. Wysocki /** 473ad07277eSRafael J. Wysocki * acpi_pm_end - Finish up system PM transition. 4740ac1b1d7SZhang Rui */ 4750ac1b1d7SZhang Rui static void acpi_pm_end(void) 4760ac1b1d7SZhang Rui { 4778ece1d83SHans de Goede acpi_turn_off_unused_power_resources(); 478ad07277eSRafael J. Wysocki acpi_scan_lock_release(); 4790ac1b1d7SZhang Rui /* 4800ac1b1d7SZhang Rui * This is necessary in case acpi_pm_finish() is not called during a 4810ac1b1d7SZhang Rui * failing transition to a sleep state. 4820ac1b1d7SZhang Rui */ 4830ac1b1d7SZhang Rui acpi_target_sleep_state = ACPI_STATE_S0; 4840ac1b1d7SZhang Rui acpi_sleep_tts_switch(acpi_target_sleep_state); 4850ac1b1d7SZhang Rui } 4860ac1b1d7SZhang Rui #else /* !CONFIG_ACPI_SLEEP */ 4870ac1b1d7SZhang Rui #define acpi_target_sleep_state ACPI_STATE_S0 4880ac1b1d7SZhang Rui static inline void acpi_sleep_dmi_check(void) {} 4890ac1b1d7SZhang Rui #endif /* CONFIG_ACPI_SLEEP */ 4900ac1b1d7SZhang Rui 4910ac1b1d7SZhang Rui #ifdef CONFIG_SUSPEND 4920ac1b1d7SZhang Rui static u32 acpi_suspend_states[] = { 4930ac1b1d7SZhang Rui [PM_SUSPEND_ON] = ACPI_STATE_S0, 4940ac1b1d7SZhang Rui [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 4950ac1b1d7SZhang Rui [PM_SUSPEND_MEM] = ACPI_STATE_S3, 4960ac1b1d7SZhang Rui [PM_SUSPEND_MAX] = ACPI_STATE_S5 4970ac1b1d7SZhang Rui }; 4980ac1b1d7SZhang Rui 4990ac1b1d7SZhang Rui /** 5000ac1b1d7SZhang Rui * acpi_suspend_begin - Set the target system sleep state to the state 5010ac1b1d7SZhang Rui * associated with given @pm_state, if supported. 5020ac1b1d7SZhang Rui */ 5030ac1b1d7SZhang Rui static int acpi_suspend_begin(suspend_state_t pm_state) 5040ac1b1d7SZhang Rui { 5050ac1b1d7SZhang Rui u32 acpi_state = acpi_suspend_states[pm_state]; 506ad07277eSRafael J. Wysocki int error; 5070ac1b1d7SZhang Rui 5080ac1b1d7SZhang Rui error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); 5090ac1b1d7SZhang Rui if (error) 5100ac1b1d7SZhang Rui return error; 5110ac1b1d7SZhang Rui 512ad07277eSRafael J. Wysocki if (!sleep_states[acpi_state]) { 513ad07277eSRafael J. Wysocki pr_err("ACPI does not support sleep state S%u\n", acpi_state); 514ad07277eSRafael J. Wysocki return -ENOSYS; 5150ac1b1d7SZhang Rui } 516ef25ba04SRafael J. Wysocki if (acpi_state > ACPI_STATE_S1) 517ef25ba04SRafael J. Wysocki pm_set_suspend_via_firmware(); 518ad07277eSRafael J. Wysocki 519ad07277eSRafael J. Wysocki acpi_pm_start(acpi_state); 520ad07277eSRafael J. Wysocki return 0; 5210ac1b1d7SZhang Rui } 5220ac1b1d7SZhang Rui 5230ac1b1d7SZhang Rui /** 5240ac1b1d7SZhang Rui * acpi_suspend_enter - Actually enter a sleep state. 5250ac1b1d7SZhang Rui * @pm_state: ignored 5260ac1b1d7SZhang Rui * 5270ac1b1d7SZhang Rui * Flush caches and go to sleep. For STR we have to call arch-specific 5280ac1b1d7SZhang Rui * assembly, which in turn call acpi_enter_sleep_state(). 5290ac1b1d7SZhang Rui * It's unfortunate, but it works. Please fix if you're feeling frisky. 5300ac1b1d7SZhang Rui */ 5310ac1b1d7SZhang Rui static int acpi_suspend_enter(suspend_state_t pm_state) 5320ac1b1d7SZhang Rui { 5330ac1b1d7SZhang Rui acpi_status status = AE_OK; 5340ac1b1d7SZhang Rui u32 acpi_state = acpi_target_sleep_state; 5350ac1b1d7SZhang Rui int error; 5360ac1b1d7SZhang Rui 5370ac1b1d7SZhang Rui ACPI_FLUSH_CPU_CACHE(); 5380ac1b1d7SZhang Rui 539bb3632c6STodd E Brandt trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true); 5400ac1b1d7SZhang Rui switch (acpi_state) { 5410ac1b1d7SZhang Rui case ACPI_STATE_S1: 5420ac1b1d7SZhang Rui barrier(); 5430ac1b1d7SZhang Rui status = acpi_enter_sleep_state(acpi_state); 5440ac1b1d7SZhang Rui break; 5450ac1b1d7SZhang Rui 5460ac1b1d7SZhang Rui case ACPI_STATE_S3: 547d6a77eadSKonrad Rzeszutek Wilk if (!acpi_suspend_lowlevel) 548d6a77eadSKonrad Rzeszutek Wilk return -ENOSYS; 5490ac1b1d7SZhang Rui error = acpi_suspend_lowlevel(); 5500ac1b1d7SZhang Rui if (error) 5510ac1b1d7SZhang Rui return error; 5520ac1b1d7SZhang Rui pr_info(PREFIX "Low-level resume complete\n"); 553ef25ba04SRafael J. Wysocki pm_set_resume_via_firmware(); 5540ac1b1d7SZhang Rui break; 5550ac1b1d7SZhang Rui } 556bb3632c6STodd E Brandt trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false); 5570ac1b1d7SZhang Rui 5580ac1b1d7SZhang Rui /* This violates the spec but is required for bug compatibility. */ 5590ac1b1d7SZhang Rui acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); 5600ac1b1d7SZhang Rui 5610ac1b1d7SZhang Rui /* Reprogram control registers */ 5620ac1b1d7SZhang Rui acpi_leave_sleep_state_prep(acpi_state); 5630ac1b1d7SZhang Rui 5640ac1b1d7SZhang Rui /* ACPI 3.0 specs (P62) says that it's the responsibility 5650ac1b1d7SZhang Rui * of the OSPM to clear the status bit [ implying that the 5660ac1b1d7SZhang Rui * POWER_BUTTON event should not reach userspace ] 5670ac1b1d7SZhang Rui * 5680ac1b1d7SZhang Rui * However, we do generate a small hint for userspace in the form of 5690ac1b1d7SZhang Rui * a wakeup event. We flag this condition for now and generate the 5700ac1b1d7SZhang Rui * event later, as we're currently too early in resume to be able to 5710ac1b1d7SZhang Rui * generate wakeup events. 5720ac1b1d7SZhang Rui */ 5730ac1b1d7SZhang Rui if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) { 57451468a9dSAl Stone acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED; 5750ac1b1d7SZhang Rui 5760ac1b1d7SZhang Rui acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status); 5770ac1b1d7SZhang Rui 57818864cc4SLv Zheng if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) { 5790ac1b1d7SZhang Rui acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 5800ac1b1d7SZhang Rui /* Flag for later */ 5810ac1b1d7SZhang Rui pwr_btn_event_pending = true; 5820ac1b1d7SZhang Rui } 5830ac1b1d7SZhang Rui } 5840ac1b1d7SZhang Rui 5850ac1b1d7SZhang Rui /* 5860ac1b1d7SZhang Rui * Disable and clear GPE status before interrupt is enabled. Some GPEs 5870ac1b1d7SZhang Rui * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. 5880ac1b1d7SZhang Rui * acpi_leave_sleep_state will reenable specific GPEs later 5890ac1b1d7SZhang Rui */ 5900ac1b1d7SZhang Rui acpi_disable_all_gpes(); 5910ac1b1d7SZhang Rui /* Allow EC transactions to happen. */ 592c2b46d67SLv Zheng acpi_ec_unblock_transactions(); 5930ac1b1d7SZhang Rui 5940ac1b1d7SZhang Rui suspend_nvs_restore(); 5950ac1b1d7SZhang Rui 5960ac1b1d7SZhang Rui return ACPI_SUCCESS(status) ? 0 : -EFAULT; 5970ac1b1d7SZhang Rui } 5980ac1b1d7SZhang Rui 5990ac1b1d7SZhang Rui static int acpi_suspend_state_valid(suspend_state_t pm_state) 6000ac1b1d7SZhang Rui { 6010ac1b1d7SZhang Rui u32 acpi_state; 6020ac1b1d7SZhang Rui 6030ac1b1d7SZhang Rui switch (pm_state) { 6040ac1b1d7SZhang Rui case PM_SUSPEND_ON: 6050ac1b1d7SZhang Rui case PM_SUSPEND_STANDBY: 6060ac1b1d7SZhang Rui case PM_SUSPEND_MEM: 6070ac1b1d7SZhang Rui acpi_state = acpi_suspend_states[pm_state]; 6080ac1b1d7SZhang Rui 6090ac1b1d7SZhang Rui return sleep_states[acpi_state]; 6100ac1b1d7SZhang Rui default: 6110ac1b1d7SZhang Rui return 0; 6120ac1b1d7SZhang Rui } 6130ac1b1d7SZhang Rui } 6140ac1b1d7SZhang Rui 6150ac1b1d7SZhang Rui static const struct platform_suspend_ops acpi_suspend_ops = { 6160ac1b1d7SZhang Rui .valid = acpi_suspend_state_valid, 6170ac1b1d7SZhang Rui .begin = acpi_suspend_begin, 6180ac1b1d7SZhang Rui .prepare_late = acpi_pm_prepare, 6190ac1b1d7SZhang Rui .enter = acpi_suspend_enter, 6200ac1b1d7SZhang Rui .wake = acpi_pm_finish, 6210ac1b1d7SZhang Rui .end = acpi_pm_end, 6220ac1b1d7SZhang Rui }; 6230ac1b1d7SZhang Rui 6240ac1b1d7SZhang Rui /** 6250ac1b1d7SZhang Rui * acpi_suspend_begin_old - Set the target system sleep state to the 6260ac1b1d7SZhang Rui * state associated with given @pm_state, if supported, and 6270ac1b1d7SZhang Rui * execute the _PTS control method. This function is used if the 6280ac1b1d7SZhang Rui * pre-ACPI 2.0 suspend ordering has been requested. 6290ac1b1d7SZhang Rui */ 6300ac1b1d7SZhang Rui static int acpi_suspend_begin_old(suspend_state_t pm_state) 6310ac1b1d7SZhang Rui { 6320ac1b1d7SZhang Rui int error = acpi_suspend_begin(pm_state); 6330ac1b1d7SZhang Rui if (!error) 6340ac1b1d7SZhang Rui error = __acpi_pm_prepare(); 6350ac1b1d7SZhang Rui 6360ac1b1d7SZhang Rui return error; 6370ac1b1d7SZhang Rui } 6380ac1b1d7SZhang Rui 6390ac1b1d7SZhang Rui /* 6400ac1b1d7SZhang Rui * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 6410ac1b1d7SZhang Rui * been requested. 6420ac1b1d7SZhang Rui */ 6430ac1b1d7SZhang Rui static const struct platform_suspend_ops acpi_suspend_ops_old = { 6440ac1b1d7SZhang Rui .valid = acpi_suspend_state_valid, 6450ac1b1d7SZhang Rui .begin = acpi_suspend_begin_old, 6460ac1b1d7SZhang Rui .prepare_late = acpi_pm_pre_suspend, 6470ac1b1d7SZhang Rui .enter = acpi_suspend_enter, 6480ac1b1d7SZhang Rui .wake = acpi_pm_finish, 6490ac1b1d7SZhang Rui .end = acpi_pm_end, 6500ac1b1d7SZhang Rui .recover = acpi_pm_finish, 6510ac1b1d7SZhang Rui }; 65202040f0bSRafael J. Wysocki 6538110dd28SRafael J. Wysocki static bool s2idle_in_progress; 65433e4f80eSRafael J. Wysocki static bool s2idle_wakeup; 65533e4f80eSRafael J. Wysocki 6568110dd28SRafael J. Wysocki /* 6578110dd28SRafael J. Wysocki * On platforms supporting the Low Power S0 Idle interface there is an ACPI 6588110dd28SRafael J. Wysocki * device object with the PNP0D80 compatible device ID (System Power Management 6598110dd28SRafael J. Wysocki * Controller) and a specific _DSM method under it. That method, if present, 6608110dd28SRafael J. Wysocki * can be used to indicate to the platform that the OS is transitioning into a 6618110dd28SRafael J. Wysocki * low-power state in which certain types of activity are not desirable or that 6628110dd28SRafael J. Wysocki * it is leaving such a state, which allows the platform to adjust its operation 6638110dd28SRafael J. Wysocki * mode accordingly. 6648110dd28SRafael J. Wysocki */ 6658110dd28SRafael J. Wysocki static const struct acpi_device_id lps0_device_ids[] = { 6668110dd28SRafael J. Wysocki {"PNP0D80", }, 6678110dd28SRafael J. Wysocki {"", }, 6688110dd28SRafael J. Wysocki }; 6698110dd28SRafael J. Wysocki 6708110dd28SRafael J. Wysocki #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66" 6718110dd28SRafael J. Wysocki 6728110dd28SRafael J. Wysocki #define ACPI_LPS0_SCREEN_OFF 3 6738110dd28SRafael J. Wysocki #define ACPI_LPS0_SCREEN_ON 4 6748110dd28SRafael J. Wysocki #define ACPI_LPS0_ENTRY 5 6758110dd28SRafael J. Wysocki #define ACPI_LPS0_EXIT 6 6768110dd28SRafael J. Wysocki 6778110dd28SRafael J. Wysocki #define ACPI_S2IDLE_FUNC_MASK ((1 << ACPI_LPS0_ENTRY) | (1 << ACPI_LPS0_EXIT)) 6788110dd28SRafael J. Wysocki 6798110dd28SRafael J. Wysocki static acpi_handle lps0_device_handle; 6808110dd28SRafael J. Wysocki static guid_t lps0_dsm_guid; 6818110dd28SRafael J. Wysocki static char lps0_dsm_func_mask; 6828110dd28SRafael J. Wysocki 6838110dd28SRafael J. Wysocki static void acpi_sleep_run_lps0_dsm(unsigned int func) 6848110dd28SRafael J. Wysocki { 6858110dd28SRafael J. Wysocki union acpi_object *out_obj; 6868110dd28SRafael J. Wysocki 6878110dd28SRafael J. Wysocki if (!(lps0_dsm_func_mask & (1 << func))) 6888110dd28SRafael J. Wysocki return; 6898110dd28SRafael J. Wysocki 6908110dd28SRafael J. Wysocki out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL); 6918110dd28SRafael J. Wysocki ACPI_FREE(out_obj); 6928110dd28SRafael J. Wysocki 6938110dd28SRafael J. Wysocki acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n", 6948110dd28SRafael J. Wysocki func, out_obj ? "successful" : "failed"); 6958110dd28SRafael J. Wysocki } 6968110dd28SRafael J. Wysocki 6978110dd28SRafael J. Wysocki static int lps0_device_attach(struct acpi_device *adev, 6988110dd28SRafael J. Wysocki const struct acpi_device_id *not_used) 6998110dd28SRafael J. Wysocki { 7008110dd28SRafael J. Wysocki union acpi_object *out_obj; 7018110dd28SRafael J. Wysocki 7028110dd28SRafael J. Wysocki if (lps0_device_handle) 7038110dd28SRafael J. Wysocki return 0; 7048110dd28SRafael J. Wysocki 7058110dd28SRafael J. Wysocki if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) 7068110dd28SRafael J. Wysocki return 0; 7078110dd28SRafael J. Wysocki 7088110dd28SRafael J. Wysocki guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid); 7098110dd28SRafael J. Wysocki /* Check if the _DSM is present and as expected. */ 7108110dd28SRafael J. Wysocki out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL); 7118110dd28SRafael J. Wysocki if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) { 7128110dd28SRafael J. Wysocki char bitmask = *(char *)out_obj->buffer.pointer; 7138110dd28SRafael J. Wysocki 7148110dd28SRafael J. Wysocki if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) { 7158110dd28SRafael J. Wysocki lps0_dsm_func_mask = bitmask; 7168110dd28SRafael J. Wysocki lps0_device_handle = adev->handle; 717*e870c6c8SRafael J. Wysocki /* 718*e870c6c8SRafael J. Wysocki * Use suspend-to-idle by default if the default 719*e870c6c8SRafael J. Wysocki * suspend mode was not set from the command line. 720*e870c6c8SRafael J. Wysocki */ 721*e870c6c8SRafael J. Wysocki if (mem_sleep_default > PM_SUSPEND_MEM) 722*e870c6c8SRafael J. Wysocki mem_sleep_current = PM_SUSPEND_FREEZE; 7238110dd28SRafael J. Wysocki } 7248110dd28SRafael J. Wysocki 7258110dd28SRafael J. Wysocki acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n", 7268110dd28SRafael J. Wysocki bitmask); 7278110dd28SRafael J. Wysocki } else { 7288110dd28SRafael J. Wysocki acpi_handle_debug(adev->handle, 7298110dd28SRafael J. Wysocki "_DSM function 0 evaluation failed\n"); 7308110dd28SRafael J. Wysocki } 7318110dd28SRafael J. Wysocki ACPI_FREE(out_obj); 7328110dd28SRafael J. Wysocki return 0; 7338110dd28SRafael J. Wysocki } 7348110dd28SRafael J. Wysocki 7358110dd28SRafael J. Wysocki static struct acpi_scan_handler lps0_handler = { 7368110dd28SRafael J. Wysocki .ids = lps0_device_ids, 7378110dd28SRafael J. Wysocki .attach = lps0_device_attach, 7388110dd28SRafael J. Wysocki }; 7398110dd28SRafael J. Wysocki 7401f0b6386SRafael J. Wysocki static int acpi_freeze_begin(void) 7411f0b6386SRafael J. Wysocki { 7421f0b6386SRafael J. Wysocki acpi_scan_lock_acquire(); 7438110dd28SRafael J. Wysocki s2idle_in_progress = true; 7441f0b6386SRafael J. Wysocki return 0; 7451f0b6386SRafael J. Wysocki } 7461f0b6386SRafael J. Wysocki 747a8d46b9eSRafael J. Wysocki static int acpi_freeze_prepare(void) 748a8d46b9eSRafael J. Wysocki { 7498110dd28SRafael J. Wysocki if (lps0_device_handle) { 7508110dd28SRafael J. Wysocki acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF); 7518110dd28SRafael J. Wysocki acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY); 7528110dd28SRafael J. Wysocki } else { 7538110dd28SRafael J. Wysocki /* 7548110dd28SRafael J. Wysocki * The configuration of GPEs is changed here to avoid spurious 7558110dd28SRafael J. Wysocki * wakeups, but that should not be necessary if this is a 7568110dd28SRafael J. Wysocki * "low-power S0" platform and the low-power S0 _DSM is present. 7578110dd28SRafael J. Wysocki */ 758a8d46b9eSRafael J. Wysocki acpi_enable_all_wakeup_gpes(); 759c52fa70cSRafael J. Wysocki acpi_os_wait_events_complete(); 7608110dd28SRafael J. Wysocki } 7618c01275eSChen Yu if (acpi_sci_irq_valid()) 7628c01275eSChen Yu enable_irq_wake(acpi_sci_irq); 763235d81a6SRafael J. Wysocki 764a8d46b9eSRafael J. Wysocki return 0; 765a8d46b9eSRafael J. Wysocki } 766a8d46b9eSRafael J. Wysocki 76733e4f80eSRafael J. Wysocki static void acpi_freeze_wake(void) 76833e4f80eSRafael J. Wysocki { 76933e4f80eSRafael J. Wysocki /* 77033e4f80eSRafael J. Wysocki * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means 77133e4f80eSRafael J. Wysocki * that the SCI has triggered while suspended, so cancel the wakeup in 77233e4f80eSRafael J. Wysocki * case it has not been a wakeup event (the GPEs will be checked later). 77333e4f80eSRafael J. Wysocki */ 77433e4f80eSRafael J. Wysocki if (acpi_sci_irq_valid() && 77533e4f80eSRafael J. Wysocki !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) { 77633e4f80eSRafael J. Wysocki pm_system_cancel_wakeup(); 77733e4f80eSRafael J. Wysocki s2idle_wakeup = true; 77833e4f80eSRafael J. Wysocki } 77933e4f80eSRafael J. Wysocki } 78033e4f80eSRafael J. Wysocki 78133e4f80eSRafael J. Wysocki static void acpi_freeze_sync(void) 78233e4f80eSRafael J. Wysocki { 78333e4f80eSRafael J. Wysocki /* 78433e4f80eSRafael J. Wysocki * Process all pending events in case there are any wakeup ones. 78533e4f80eSRafael J. Wysocki * 78633e4f80eSRafael J. Wysocki * The EC driver uses the system workqueue, so that one needs to be 78733e4f80eSRafael J. Wysocki * flushed too. 78833e4f80eSRafael J. Wysocki */ 78933e4f80eSRafael J. Wysocki acpi_os_wait_events_complete(); 79033e4f80eSRafael J. Wysocki flush_scheduled_work(); 79133e4f80eSRafael J. Wysocki s2idle_wakeup = false; 79233e4f80eSRafael J. Wysocki } 79333e4f80eSRafael J. Wysocki 794a8d46b9eSRafael J. Wysocki static void acpi_freeze_restore(void) 795a8d46b9eSRafael J. Wysocki { 7968c01275eSChen Yu if (acpi_sci_irq_valid()) 7978c01275eSChen Yu disable_irq_wake(acpi_sci_irq); 798235d81a6SRafael J. Wysocki 7998110dd28SRafael J. Wysocki if (lps0_device_handle) { 8008110dd28SRafael J. Wysocki acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT); 8018110dd28SRafael J. Wysocki acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON); 8028110dd28SRafael J. Wysocki } else { 803a8d46b9eSRafael J. Wysocki acpi_enable_all_runtime_gpes(); 804a8d46b9eSRafael J. Wysocki } 8058110dd28SRafael J. Wysocki } 806a8d46b9eSRafael J. Wysocki 8071f0b6386SRafael J. Wysocki static void acpi_freeze_end(void) 8081f0b6386SRafael J. Wysocki { 8098110dd28SRafael J. Wysocki s2idle_in_progress = false; 8101f0b6386SRafael J. Wysocki acpi_scan_lock_release(); 8111f0b6386SRafael J. Wysocki } 8121f0b6386SRafael J. Wysocki 8131f0b6386SRafael J. Wysocki static const struct platform_freeze_ops acpi_freeze_ops = { 8141f0b6386SRafael J. Wysocki .begin = acpi_freeze_begin, 815a8d46b9eSRafael J. Wysocki .prepare = acpi_freeze_prepare, 81633e4f80eSRafael J. Wysocki .wake = acpi_freeze_wake, 81733e4f80eSRafael J. Wysocki .sync = acpi_freeze_sync, 818a8d46b9eSRafael J. Wysocki .restore = acpi_freeze_restore, 8191f0b6386SRafael J. Wysocki .end = acpi_freeze_end, 8201f0b6386SRafael J. Wysocki }; 8211f0b6386SRafael J. Wysocki 82202040f0bSRafael J. Wysocki static void acpi_sleep_suspend_setup(void) 82302040f0bSRafael J. Wysocki { 82402040f0bSRafael J. Wysocki int i; 82502040f0bSRafael J. Wysocki 826a4e90bedSRafael J. Wysocki for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) 827a4e90bedSRafael J. Wysocki if (acpi_sleep_state_supported(i)) 82802040f0bSRafael J. Wysocki sleep_states[i] = 1; 82902040f0bSRafael J. Wysocki 83002040f0bSRafael J. Wysocki suspend_set_ops(old_suspend_ordering ? 83102040f0bSRafael J. Wysocki &acpi_suspend_ops_old : &acpi_suspend_ops); 8328110dd28SRafael J. Wysocki 8338110dd28SRafael J. Wysocki acpi_scan_add_handler(&lps0_handler); 8341f0b6386SRafael J. Wysocki freeze_set_ops(&acpi_freeze_ops); 83502040f0bSRafael J. Wysocki } 8361f0b6386SRafael J. Wysocki 83702040f0bSRafael J. Wysocki #else /* !CONFIG_SUSPEND */ 8388110dd28SRafael J. Wysocki #define s2idle_in_progress (false) 83933e4f80eSRafael J. Wysocki #define s2idle_wakeup (false) 8408110dd28SRafael J. Wysocki #define lps0_device_handle (NULL) 84102040f0bSRafael J. Wysocki static inline void acpi_sleep_suspend_setup(void) {} 84202040f0bSRafael J. Wysocki #endif /* !CONFIG_SUSPEND */ 843d08ca2caSLen Brown 84433e4f80eSRafael J. Wysocki bool acpi_s2idle_wakeup(void) 84533e4f80eSRafael J. Wysocki { 84633e4f80eSRafael J. Wysocki return s2idle_wakeup; 84733e4f80eSRafael J. Wysocki } 84833e4f80eSRafael J. Wysocki 8498110dd28SRafael J. Wysocki bool acpi_sleep_no_ec_events(void) 8508110dd28SRafael J. Wysocki { 8518110dd28SRafael J. Wysocki return !s2idle_in_progress || !lps0_device_handle; 8528110dd28SRafael J. Wysocki } 8538110dd28SRafael J. Wysocki 854504997cfSSudeep Holla #ifdef CONFIG_PM_SLEEP 855504997cfSSudeep Holla static u32 saved_bm_rld; 856504997cfSSudeep Holla 857504997cfSSudeep Holla static int acpi_save_bm_rld(void) 858504997cfSSudeep Holla { 859504997cfSSudeep Holla acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); 860504997cfSSudeep Holla return 0; 861504997cfSSudeep Holla } 862504997cfSSudeep Holla 863504997cfSSudeep Holla static void acpi_restore_bm_rld(void) 864504997cfSSudeep Holla { 865504997cfSSudeep Holla u32 resumed_bm_rld = 0; 866504997cfSSudeep Holla 867504997cfSSudeep Holla acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); 868504997cfSSudeep Holla if (resumed_bm_rld == saved_bm_rld) 869504997cfSSudeep Holla return; 870504997cfSSudeep Holla 871504997cfSSudeep Holla acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); 872504997cfSSudeep Holla } 873504997cfSSudeep Holla 874504997cfSSudeep Holla static struct syscore_ops acpi_sleep_syscore_ops = { 875504997cfSSudeep Holla .suspend = acpi_save_bm_rld, 876504997cfSSudeep Holla .resume = acpi_restore_bm_rld, 877504997cfSSudeep Holla }; 878504997cfSSudeep Holla 879504997cfSSudeep Holla void acpi_sleep_syscore_init(void) 880504997cfSSudeep Holla { 881504997cfSSudeep Holla register_syscore_ops(&acpi_sleep_syscore_ops); 882504997cfSSudeep Holla } 883504997cfSSudeep Holla #else 884504997cfSSudeep Holla static inline void acpi_sleep_syscore_init(void) {} 885504997cfSSudeep Holla #endif /* CONFIG_PM_SLEEP */ 886504997cfSSudeep Holla 887d08ca2caSLen Brown #ifdef CONFIG_HIBERNATION 888d08ca2caSLen Brown static unsigned long s4_hardware_signature; 889d08ca2caSLen Brown static struct acpi_table_facs *facs; 890d08ca2caSLen Brown static bool nosigcheck; 891d08ca2caSLen Brown 892d08ca2caSLen Brown void __init acpi_no_s4_hw_signature(void) 893d08ca2caSLen Brown { 894d08ca2caSLen Brown nosigcheck = true; 895d08ca2caSLen Brown } 896d08ca2caSLen Brown 897d08ca2caSLen Brown static int acpi_hibernation_begin(void) 898d08ca2caSLen Brown { 899d08ca2caSLen Brown int error; 900d08ca2caSLen Brown 90172ad5d77SRafael J. Wysocki error = nvs_nosave ? 0 : suspend_nvs_alloc(); 902ad07277eSRafael J. Wysocki if (!error) 903ad07277eSRafael J. Wysocki acpi_pm_start(ACPI_STATE_S4); 904d08ca2caSLen Brown 905d08ca2caSLen Brown return error; 906d08ca2caSLen Brown } 907d08ca2caSLen Brown 908d08ca2caSLen Brown static int acpi_hibernation_enter(void) 909d08ca2caSLen Brown { 910d08ca2caSLen Brown acpi_status status = AE_OK; 911d08ca2caSLen Brown 912d08ca2caSLen Brown ACPI_FLUSH_CPU_CACHE(); 913d08ca2caSLen Brown 914d08ca2caSLen Brown /* This shouldn't return. If it returns, we have a problem */ 9153f6f49c7SLen Brown status = acpi_enter_sleep_state(ACPI_STATE_S4); 9163f6f49c7SLen Brown /* Reprogram control registers */ 9173f6f49c7SLen Brown acpi_leave_sleep_state_prep(ACPI_STATE_S4); 918d08ca2caSLen Brown 919d08ca2caSLen Brown return ACPI_SUCCESS(status) ? 0 : -EFAULT; 920d08ca2caSLen Brown } 921d08ca2caSLen Brown 922d08ca2caSLen Brown static void acpi_hibernation_leave(void) 923d08ca2caSLen Brown { 924fbda4b38SLukas Wunner pm_set_resume_via_firmware(); 925d08ca2caSLen Brown /* 926d08ca2caSLen Brown * If ACPI is not enabled by the BIOS and the boot kernel, we need to 927d08ca2caSLen Brown * enable it here. 928d08ca2caSLen Brown */ 929d08ca2caSLen Brown acpi_enable(); 9303f6f49c7SLen Brown /* Reprogram control registers */ 9313f6f49c7SLen Brown acpi_leave_sleep_state_prep(ACPI_STATE_S4); 932d08ca2caSLen Brown /* Check the hardware signature */ 9335c551e62SOliver Neukum if (facs && s4_hardware_signature != facs->hardware_signature) 9345c551e62SOliver Neukum pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n"); 935d08ca2caSLen Brown /* Restore the NVS memory area */ 936dd4c4f17SMatthew Garrett suspend_nvs_restore(); 937d5a64513SRafael J. Wysocki /* Allow EC transactions to happen. */ 938c2b46d67SLv Zheng acpi_ec_unblock_transactions(); 939d08ca2caSLen Brown } 940d08ca2caSLen Brown 941d5a64513SRafael J. Wysocki static void acpi_pm_thaw(void) 942f6bb13aaSRafael J. Wysocki { 943fe955682SRafael J. Wysocki acpi_ec_unblock_transactions(); 944d08ca2caSLen Brown acpi_enable_all_runtime_gpes(); 945d08ca2caSLen Brown } 946d08ca2caSLen Brown 947073ef1f6SLionel Debroux static const struct platform_hibernation_ops acpi_hibernation_ops = { 948d08ca2caSLen Brown .begin = acpi_hibernation_begin, 949d08ca2caSLen Brown .end = acpi_pm_end, 950c5f7a1bbSRafael J. Wysocki .pre_snapshot = acpi_pm_prepare, 9512a6b6976SMatthew Garrett .finish = acpi_pm_finish, 952d08ca2caSLen Brown .prepare = acpi_pm_prepare, 953d08ca2caSLen Brown .enter = acpi_hibernation_enter, 954d08ca2caSLen Brown .leave = acpi_hibernation_leave, 955d5a64513SRafael J. Wysocki .pre_restore = acpi_pm_freeze, 956d5a64513SRafael J. Wysocki .restore_cleanup = acpi_pm_thaw, 957d08ca2caSLen Brown }; 958d08ca2caSLen Brown 959d08ca2caSLen Brown /** 960d08ca2caSLen Brown * acpi_hibernation_begin_old - Set the target system sleep state to 961d08ca2caSLen Brown * ACPI_STATE_S4 and execute the _PTS control method. This 962d08ca2caSLen Brown * function is used if the pre-ACPI 2.0 suspend ordering has been 963d08ca2caSLen Brown * requested. 964d08ca2caSLen Brown */ 965d08ca2caSLen Brown static int acpi_hibernation_begin_old(void) 966d08ca2caSLen Brown { 967d08ca2caSLen Brown int error; 968d08ca2caSLen Brown /* 969d08ca2caSLen Brown * The _TTS object should always be evaluated before the _PTS object. 970d08ca2caSLen Brown * When the old_suspended_ordering is true, the _PTS object is 971d08ca2caSLen Brown * evaluated in the acpi_sleep_prepare. 972d08ca2caSLen Brown */ 973d08ca2caSLen Brown acpi_sleep_tts_switch(ACPI_STATE_S4); 974d08ca2caSLen Brown 975d08ca2caSLen Brown error = acpi_sleep_prepare(ACPI_STATE_S4); 976d08ca2caSLen Brown 977d08ca2caSLen Brown if (!error) { 97872ad5d77SRafael J. Wysocki if (!nvs_nosave) 979dd4c4f17SMatthew Garrett error = suspend_nvs_alloc(); 980ad07277eSRafael J. Wysocki if (!error) { 981d08ca2caSLen Brown acpi_target_sleep_state = ACPI_STATE_S4; 982ad07277eSRafael J. Wysocki acpi_scan_lock_acquire(); 983ad07277eSRafael J. Wysocki } 984d08ca2caSLen Brown } 985d08ca2caSLen Brown return error; 986d08ca2caSLen Brown } 987d08ca2caSLen Brown 988d08ca2caSLen Brown /* 989d08ca2caSLen Brown * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 990d08ca2caSLen Brown * been requested. 991d08ca2caSLen Brown */ 992073ef1f6SLionel Debroux static const struct platform_hibernation_ops acpi_hibernation_ops_old = { 993d08ca2caSLen Brown .begin = acpi_hibernation_begin_old, 994d08ca2caSLen Brown .end = acpi_pm_end, 995c5f7a1bbSRafael J. Wysocki .pre_snapshot = acpi_pm_pre_suspend, 996d5a64513SRafael J. Wysocki .prepare = acpi_pm_freeze, 9972a6b6976SMatthew Garrett .finish = acpi_pm_finish, 998d08ca2caSLen Brown .enter = acpi_hibernation_enter, 999d08ca2caSLen Brown .leave = acpi_hibernation_leave, 1000d5a64513SRafael J. Wysocki .pre_restore = acpi_pm_freeze, 1001d5a64513SRafael J. Wysocki .restore_cleanup = acpi_pm_thaw, 1002d08ca2caSLen Brown .recover = acpi_pm_finish, 1003d08ca2caSLen Brown }; 100402040f0bSRafael J. Wysocki 100502040f0bSRafael J. Wysocki static void acpi_sleep_hibernate_setup(void) 100602040f0bSRafael J. Wysocki { 1007a4e90bedSRafael J. Wysocki if (!acpi_sleep_state_supported(ACPI_STATE_S4)) 100802040f0bSRafael J. Wysocki return; 100902040f0bSRafael J. Wysocki 101002040f0bSRafael J. Wysocki hibernation_set_ops(old_suspend_ordering ? 101102040f0bSRafael J. Wysocki &acpi_hibernation_ops_old : &acpi_hibernation_ops); 101202040f0bSRafael J. Wysocki sleep_states[ACPI_STATE_S4] = 1; 101302040f0bSRafael J. Wysocki if (nosigcheck) 101402040f0bSRafael J. Wysocki return; 101502040f0bSRafael J. Wysocki 101602040f0bSRafael J. Wysocki acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); 101702040f0bSRafael J. Wysocki if (facs) 101802040f0bSRafael J. Wysocki s4_hardware_signature = facs->hardware_signature; 101902040f0bSRafael J. Wysocki } 102002040f0bSRafael J. Wysocki #else /* !CONFIG_HIBERNATION */ 102102040f0bSRafael J. Wysocki static inline void acpi_sleep_hibernate_setup(void) {} 102202040f0bSRafael J. Wysocki #endif /* !CONFIG_HIBERNATION */ 1023d08ca2caSLen Brown 1024d08ca2caSLen Brown static void acpi_power_off_prepare(void) 1025d08ca2caSLen Brown { 1026d08ca2caSLen Brown /* Prepare to power off the system */ 1027d08ca2caSLen Brown acpi_sleep_prepare(ACPI_STATE_S5); 1028d08ca2caSLen Brown acpi_disable_all_gpes(); 1029c52fa70cSRafael J. Wysocki acpi_os_wait_events_complete(); 1030d08ca2caSLen Brown } 1031d08ca2caSLen Brown 1032d08ca2caSLen Brown static void acpi_power_off(void) 1033d08ca2caSLen Brown { 1034d08ca2caSLen Brown /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 10354d939155SFrank Seidel printk(KERN_DEBUG "%s called\n", __func__); 1036d08ca2caSLen Brown local_irq_disable(); 10373f6f49c7SLen Brown acpi_enter_sleep_state(ACPI_STATE_S5); 103896f15efcSLen Brown } 103996f15efcSLen Brown 1040d08ca2caSLen Brown int __init acpi_sleep_init(void) 1041d08ca2caSLen Brown { 1042ed4cf5b2SJoe Perches char supported[ACPI_S_STATE_COUNT * 3 + 1]; 1043ed4cf5b2SJoe Perches char *pos = supported; 1044ed4cf5b2SJoe Perches int i; 1045d08ca2caSLen Brown 10460ac1b1d7SZhang Rui acpi_sleep_dmi_check(); 10470ac1b1d7SZhang Rui 1048d08ca2caSLen Brown sleep_states[ACPI_STATE_S0] = 1; 1049d08ca2caSLen Brown 1050504997cfSSudeep Holla acpi_sleep_syscore_init(); 105102040f0bSRafael J. Wysocki acpi_sleep_suspend_setup(); 105202040f0bSRafael J. Wysocki acpi_sleep_hibernate_setup(); 1053d08ca2caSLen Brown 1054a4e90bedSRafael J. Wysocki if (acpi_sleep_state_supported(ACPI_STATE_S5)) { 1055d08ca2caSLen Brown sleep_states[ACPI_STATE_S5] = 1; 1056d08ca2caSLen Brown pm_power_off_prepare = acpi_power_off_prepare; 1057d08ca2caSLen Brown pm_power_off = acpi_power_off; 105813737181SChen Yu } else { 105913737181SChen Yu acpi_no_s5 = true; 1060d08ca2caSLen Brown } 1061ed4cf5b2SJoe Perches 1062ed4cf5b2SJoe Perches supported[0] = 0; 1063ed4cf5b2SJoe Perches for (i = 0; i < ACPI_S_STATE_COUNT; i++) { 1064ed4cf5b2SJoe Perches if (sleep_states[i]) 1065ed4cf5b2SJoe Perches pos += sprintf(pos, " S%d", i); 1066ed4cf5b2SJoe Perches } 1067ed4cf5b2SJoe Perches pr_info(PREFIX "(supports%s)\n", supported); 1068ed4cf5b2SJoe Perches 1069d08ca2caSLen Brown /* 10709713adc2SRafael J. Wysocki * Register the tts_notifier to reboot notifier list so that the _TTS 10719713adc2SRafael J. Wysocki * object can also be evaluated when the system enters S5. 1072d08ca2caSLen Brown */ 10739713adc2SRafael J. Wysocki register_reboot_notifier(&tts_notifier); 1074d08ca2caSLen Brown return 0; 1075d08ca2caSLen Brown } 1076