diff --git a/MAINTAINERS b/MAINTAINERS
index 33eea28c22..1a3fc1dd56 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2146,6 +2146,11 @@ M: Leonid Bloch <lb.workbox@gmail.com>
 S: Maintained
 F: hw/acpi/battery.*
 
+AC Adapter
+M: Leonid Bloch <lb.workbox@gmail.com>
+S: Maintained
+F: hw/acpi/acad.*
+
 Subsystems
 ----------
 Audio
diff --git a/docs/specs/acad.txt b/docs/specs/acad.txt
new file mode 100644
index 0000000000..0d563a7b50
--- /dev/null
+++ b/docs/specs/acad.txt
@@ -0,0 +1,24 @@
+AC ADAPTER DEVICE
+=================
+
+The AC adapter device communicates the host's AC adapter state to the
+guest. The probing of the host's AC adapter state occurs on guest ACPI
+requests, as well as on timed intervals. If a change of the host's AC
+adapter state is detected on one of the timed probes (connected/disconnected)
+an ACPI notification is sent to the guest, so it will be able to
+update its AC adapter status accordingly.
+
+The time interval between the periodic probes is 2 s by default.
+A property 'probe_interval' allows to modify this value. The value
+should be provided in milliseconds. A zero value disables the periodic
+probes, and makes the AC adapter state updates occur on guest requests
+only.
+
+The host's AC adapter information is taken from the sysfs AC adapter
+data, located in:
+
+/sys/class/power_supply/[device of type "Mains"]
+
+If the sysfs path differs, a different AC adapter needs to be probed,
+or even if a "fake" host AC adapter is to be provided, a 'sysfs_path'
+property allows to override the default one.
diff --git a/hw/acpi/Kconfig b/hw/acpi/Kconfig
index 6b4c41037a..d35331fbf7 100644
--- a/hw/acpi/Kconfig
+++ b/hw/acpi/Kconfig
@@ -45,4 +45,8 @@ config BATTERY
     bool
     depends on ACPI
 
+config AC_ADAPTER
+    bool
+    depends on ACPI
+
 config ACPI_HW_REDUCED
diff --git a/hw/acpi/acad.c b/hw/acpi/acad.c
new file mode 100644
index 0000000000..279452e95f
--- /dev/null
+++ b/hw/acpi/acad.c
@@ -0,0 +1,318 @@
+/*
+ * QEMU emulated AC adapter device.
+ *
+ * Copyright (c) 2019 Janus Technologies, Inc. (http://janustech.com)
+ *
+ * Authors:
+ *     Leonid Bloch <lb.workbox@gmail.com>
+ *     Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
+ *     Dmitry Fleytman <dmitry.fleytman@gmail.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory for details.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "trace.h"
+#include "hw/isa/isa.h"
+#include "hw/acpi/acpi.h"
+#include "hw/nvram/fw_cfg.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "hw/qdev-properties.h"
+#include "migration/vmstate.h"
+
+#include "hw/acpi/acad.h"
+
+#define AC_ADAPTER_DEVICE(obj) OBJECT_CHECK(ACADState, (obj), \
+                                            TYPE_AC_ADAPTER)
+
+#define AC_STA_ADDR               0
+
+#define SYSFS_PATH                "/sys/class/power_supply"
+#define AC_ADAPTER_TYPE           "Mains"
+#define MAX_ALLOWED_TYPE_LENGTH   16
+
+enum {
+    AC_ADAPTER_OFFLINE = 0,
+    AC_ADAPTER_ONLINE = 1,
+};
+
+typedef struct ACADState {
+    ISADevice dev;
+    MemoryRegion io;
+    uint16_t ioport;
+    uint8_t state;
+
+    QEMUTimer *probe_state_timer;
+    uint64_t probe_state_interval;
+
+    char *acad_path;
+} ACADState;
+
+static const char *online_file = "online";
+static const char *type_file = "type";
+
+static inline bool acad_file_accessible(char *path, const char *file)
+{
+    char full_path[PATH_MAX];
+    int path_len;
+
+    path_len = snprintf(full_path, PATH_MAX, "%s/%s", path, file);
+    if (path_len < 0 || path_len >= PATH_MAX) {
+        return false;
+    }
+
+    if (access(full_path, R_OK) == 0) {
+        return true;
+    }
+    return false;
+}
+
+static void acad_get_state(ACADState *s)
+{
+    char file_path[PATH_MAX];
+    int path_len;
+    uint8_t val;
+    FILE *ff;
+
+    path_len = snprintf(file_path, PATH_MAX, "%s/%s", s->acad_path,
+                        online_file);
+    if (path_len < 0 || path_len >= PATH_MAX) {
+        warn_report("Could not read the AC adapter state.");
+        return;
+    }
+
+    ff = fopen(file_path, "r");
+    if (ff == NULL) {
+        warn_report("Could not read the AC adapter state.");
+        return;
+    }
+
+    if (!fscanf(ff, "%hhu", &val)) {
+        warn_report("AC adapter state unreadable.");
+    } else {
+        switch (val) {
+        case AC_ADAPTER_OFFLINE:
+        case AC_ADAPTER_ONLINE:
+            s->state = val;
+            break;
+        default:
+            warn_report("AC adapter state undetermined.");
+        }
+    }
+    fclose(ff);
+}
+
+static void acad_get_dynamic_status(ACADState *s)
+{
+    acad_get_state(s);
+
+    trace_acad_get_dynamic_status(s->state);
+}
+
+static void acad_probe_state(void *opaque)
+{
+    ACADState *s = opaque;
+
+    uint8_t state_before = s->state;
+
+    acad_get_dynamic_status(s);
+
+    if (state_before != s->state) {
+        Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
+        acpi_send_event(DEVICE(obj), ACPI_AC_ADAPTER_CHANGE_STATUS);
+    }
+    timer_mod(s->probe_state_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
+              s->probe_state_interval);
+}
+
+static void acad_probe_state_timer_init(ACADState *s)
+{
+    if (s->probe_state_interval > 0) {
+        s->probe_state_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL,
+                                            acad_probe_state, s);
+        timer_mod(s->probe_state_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
+                  s->probe_state_interval);
+    }
+}
+
+static bool acad_verify_sysfs(ACADState *s, char *path)
+{
+    FILE *ff;
+    char type_path[PATH_MAX];
+    int path_len;
+    char val[MAX_ALLOWED_TYPE_LENGTH];
+
+    path_len = snprintf(type_path, PATH_MAX, "%s/%s", path, type_file);
+    if (path_len < 0 || path_len >= PATH_MAX) {
+        return false;
+    }
+
+    ff = fopen(type_path, "r");
+    if (ff == NULL) {
+        return false;
+    }
+
+    if (fgets(val, MAX_ALLOWED_TYPE_LENGTH, ff) == NULL) {
+        fclose(ff);
+        return false;
+    } else {
+        val[strcspn(val, "\n")] = 0;
+        if (strncmp(val, AC_ADAPTER_TYPE, MAX_ALLOWED_TYPE_LENGTH)) {
+            fclose(ff);
+            return false;
+        }
+    }
+    fclose(ff);
+
+    return acad_file_accessible(path, online_file);
+}
+
+static bool get_acad_path(DeviceState *dev)
+{
+    ACADState *s = AC_ADAPTER_DEVICE(dev);
+    DIR *dir;
+    struct dirent *ent;
+    char bp[PATH_MAX];
+    int path_len;
+
+    if (s->acad_path) {
+        return acad_verify_sysfs(s, s->acad_path);
+    }
+
+    dir = opendir(SYSFS_PATH);
+    if (dir == NULL) {
+        return false;
+    }
+
+    ent = readdir(dir);
+    while (ent != NULL) {
+        if (ent->d_name[0] != '.') {
+            path_len = snprintf(bp, PATH_MAX, "%s/%s", SYSFS_PATH,
+                                ent->d_name);
+            if (path_len < 0 || path_len >= PATH_MAX) {
+                return false;
+            }
+            if (acad_verify_sysfs(s, bp)) {
+                qdev_prop_set_string(dev, AC_ADAPTER_PATH_PROP, bp);
+                closedir(dir);
+                return true;
+            }
+        }
+        ent = readdir(dir);
+    }
+    closedir(dir);
+
+    return false;
+}
+
+static void acad_realize(DeviceState *dev, Error **errp)
+{
+    ISADevice *d = ISA_DEVICE(dev);
+    ACADState *s = AC_ADAPTER_DEVICE(dev);
+    FWCfgState *fw_cfg = fw_cfg_find();
+    uint16_t *acad_port;
+    char err_details[32] = {};
+
+    trace_acad_realize();
+
+    if (!s->acad_path) {
+        strcpy(err_details, " Try using 'sysfs_path='");
+    }
+
+    if (!get_acad_path(dev)) {
+        error_setg(errp, "AC adapter sysfs path not found or unreadable.%s",
+                   err_details);
+        return;
+    }
+
+    isa_register_ioport(d, &s->io, s->ioport);
+
+    acad_probe_state_timer_init(s);
+
+    if (!fw_cfg) {
+        return;
+    }
+
+    acad_port = g_malloc(sizeof(*acad_port));
+    *acad_port = cpu_to_le16(s->ioport);
+    fw_cfg_add_file(fw_cfg, "etc/acad-port", acad_port,
+                    sizeof(*acad_port));
+}
+
+static Property acad_device_properties[] = {
+    DEFINE_PROP_UINT16(AC_ADAPTER_IOPORT_PROP, ACADState, ioport, 0x53c),
+    DEFINE_PROP_UINT64(AC_ADAPTER_PROBE_STATE_INTERVAL, ACADState,
+                       probe_state_interval, 2000),
+    DEFINE_PROP_STRING(AC_ADAPTER_PATH_PROP, ACADState, acad_path),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription acad_vmstate = {
+    .name = "acad",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT16(ioport, ACADState),
+        VMSTATE_UINT64(probe_state_interval, ACADState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void acad_class_init(ObjectClass *class, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(class);
+
+    dc->realize = acad_realize;
+    device_class_set_props(dc, acad_device_properties);
+    dc->vmsd = &acad_vmstate;
+}
+
+static uint64_t acad_ioport_read(void *opaque, hwaddr addr, unsigned size)
+{
+    ACADState *s = opaque;
+
+    acad_get_dynamic_status(s);
+
+    switch (addr) {
+    case AC_STA_ADDR:
+        return s->state;
+    default:
+        warn_report("AC adapter: guest read unknown value.");
+        trace_acad_ioport_read_unknown();
+        return 0;
+    }
+}
+
+static const MemoryRegionOps acad_ops = {
+    .read = acad_ioport_read,
+    .impl = {
+        .min_access_size = 1,
+        .max_access_size = 1,
+    },
+};
+
+static void acad_instance_init(Object *obj)
+{
+    ACADState *s = AC_ADAPTER_DEVICE(obj);
+
+    memory_region_init_io(&s->io, obj, &acad_ops, s, "acad",
+                          AC_ADAPTER_LEN);
+}
+
+static const TypeInfo acad_info = {
+    .name          = TYPE_AC_ADAPTER,
+    .parent        = TYPE_ISA_DEVICE,
+    .instance_size = sizeof(ACADState),
+    .class_init    = acad_class_init,
+    .instance_init = acad_instance_init,
+};
+
+static void acad_register_types(void)
+{
+    type_register_static(&acad_info);
+}
+
+type_init(acad_register_types)
diff --git a/hw/acpi/meson.build b/hw/acpi/meson.build
index 485eab33b6..2ae756c6ef 100644
--- a/hw/acpi/meson.build
+++ b/hw/acpi/meson.build
@@ -20,6 +20,7 @@ acpi_ss.add(when: 'CONFIG_IPMI', if_true: files('ipmi.c'), if_false: files('ipmi
 acpi_ss.add(when: 'CONFIG_PC', if_false: files('acpi-x86-stub.c'))
 acpi_ss.add(when: 'CONFIG_TPM', if_true: files('tpm.c'))
 acpi_ss.add(when: 'CONFIG_BATTERY', if_true: files('battery.c'))
+acpi_ss.add(when: 'CONFIG_AC_ADAPTER', if_true: files('acad.c'))
 softmmu_ss.add(when: 'CONFIG_ACPI', if_false: files('acpi-stub.c', 'aml-build-stub.c'))
 softmmu_ss.add_all(when: 'CONFIG_ACPI', if_true: acpi_ss)
 softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('acpi-stub.c', 'aml-build-stub.c',
diff --git a/hw/acpi/trace-events b/hw/acpi/trace-events
index 5d2c606496..496a282cdc 100644
--- a/hw/acpi/trace-events
+++ b/hw/acpi/trace-events
@@ -58,3 +58,8 @@ tco_timer_expired(int timeouts_no, bool strap, bool no_reboot) "timeouts_no=%d n
 battery_realize(void) "Battery device realize entry"
 battery_get_dynamic_status(uint32_t state, uint32_t rate, uint32_t charge) "Battery read state: 0x%"PRIx32", rate: %"PRIu32", charge: %"PRIu32
 battery_ioport_read_unknown(void) "Battery read unknown"
+
+# acad.c
+acad_realize(void) "AC adapter device realize entry"
+acad_get_dynamic_status(uint8_t state) "AC adapter read state: %"PRIu8
+acad_ioport_read_unknown(void) "AC adapter read unknown"
diff --git a/hw/i386/Kconfig b/hw/i386/Kconfig
index b081be7a0f..483b3ccec8 100644
--- a/hw/i386/Kconfig
+++ b/hw/i386/Kconfig
@@ -24,6 +24,7 @@ config PC
     imply VGA_PCI
     imply VIRTIO_VGA
     imply BATTERY
+    imply AC_ADAPTER
     select FDC
     select I8259
     select I8254
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index ecd5380f82..96dbeed22f 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -36,6 +36,7 @@
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/cpu.h"
 #include "hw/acpi/battery.h"
+#include "hw/acpi/acad.h"
 #include "hw/nvram/fw_cfg.h"
 #include "hw/acpi/bios-linker-loader.h"
 #include "hw/isa/isa.h"
@@ -114,6 +115,7 @@ typedef struct AcpiMiscInfo {
     unsigned dsdt_size;
     uint16_t pvpanic_port;
     uint16_t battery_port;
+    uint16_t acad_port;
     uint16_t applesmc_io_base;
 } AcpiMiscInfo;
 
@@ -280,6 +282,7 @@ static void acpi_get_misc_info(AcpiMiscInfo *info)
     info->tpm_version = tpm_get_version(tpm_find());
     info->pvpanic_port = pvpanic_port();
     info->battery_port = battery_port();
+    info->acad_port = acad_port();
     info->applesmc_io_base = applesmc_port();
 }
 
@@ -1728,6 +1731,55 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
         aml_append(dsdt, method);
     }
 
+    if (misc->acad_port) {
+        Aml *acad_state  = aml_local(0);
+
+        dev = aml_device("ADP0");
+        aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0003")));
+
+        aml_append(dev, aml_operation_region("ACST", AML_SYSTEM_IO,
+                                             aml_int(misc->acad_port),
+                                             AC_ADAPTER_LEN));
+        field = aml_field("ACST", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE);
+        aml_append(field, aml_named_field("PWRS", 8));
+        aml_append(dev, field);
+
+        method = aml_method("_PSR", 0, AML_NOTSERIALIZED);
+        aml_append(method, aml_store(aml_name("PWRS"), acad_state));
+        aml_append(method, aml_return(acad_state));
+        aml_append(dev, method);
+
+        method = aml_method("_PCL", 0, AML_NOTSERIALIZED);
+        pkg = aml_package(1);
+        aml_append(pkg, aml_name("_SB"));
+        aml_append(method, aml_return(pkg));
+        aml_append(dev, method);
+
+        method = aml_method("_PIF", 0, AML_NOTSERIALIZED);
+        pkg = aml_package(6);
+        /* Power Source State */
+        aml_append(pkg, aml_int(0));  /* Non-redundant, non-shared */
+        /* Maximum Output Power */
+        aml_append(pkg, aml_int(AC_ADAPTER_VAL_UNKNOWN));
+        /* Maximum Input Power */
+        aml_append(pkg, aml_int(AC_ADAPTER_VAL_UNKNOWN));
+        /* Model Number */
+        aml_append(pkg, aml_string("QADP001"));
+        /* Serial Number */
+        aml_append(pkg, aml_string("SN00000"));
+        /* OEM Information */
+        aml_append(pkg, aml_string("QEMU"));
+        aml_append(method, aml_return(pkg));
+        aml_append(dev, method);
+
+        aml_append(sb_scope, dev);
+
+        /* Status Change */
+        method = aml_method("\\_GPE._E0A", 0, AML_NOTSERIALIZED);
+        aml_append(method, aml_notify(aml_name("\\_SB.ADP0"), aml_int(0x80)));
+        aml_append(dsdt, method);
+    }
+
     aml_append(dsdt, sb_scope);
 
     /* copy AML table into ACPI tables blob and patch header there */
diff --git a/include/hw/acpi/acad.h b/include/hw/acpi/acad.h
new file mode 100644
index 0000000000..be61c57064
--- /dev/null
+++ b/include/hw/acpi/acad.h
@@ -0,0 +1,37 @@
+/*
+ * QEMU emulated AC adapter device.
+ *
+ * Copyright (c) 2019 Janus Technologies, Inc. (http://janustech.com)
+ *
+ * Authors:
+ *     Leonid Bloch <lb.workbox@gmail.com>
+ *     Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
+ *     Dmitry Fleytman <dmitry.fleytman@gmail.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory for details.
+ *
+ */
+
+#ifndef HW_ACPI_AC_ADAPTER_H
+#define HW_ACPI_AC_ADAPTER_H
+
+#define TYPE_AC_ADAPTER                  "acad"
+#define AC_ADAPTER_IOPORT_PROP           "ioport"
+#define AC_ADAPTER_PATH_PROP             "sysfs_path"
+#define AC_ADAPTER_PROBE_STATE_INTERVAL  "probe_interval"
+
+#define AC_ADAPTER_VAL_UNKNOWN  0xFFFFFFFF
+
+#define AC_ADAPTER_LEN          1
+
+static inline uint16_t acad_port(void)
+{
+    Object *o = object_resolve_path_type("", TYPE_AC_ADAPTER, NULL);
+    if (!o) {
+        return 0;
+    }
+    return object_property_get_uint(o, AC_ADAPTER_IOPORT_PROP, NULL);
+}
+
+#endif
diff --git a/include/hw/acpi/acpi_dev_interface.h b/include/hw/acpi/acpi_dev_interface.h
index 3d98d5636a..b577a4db07 100644
--- a/include/hw/acpi/acpi_dev_interface.h
+++ b/include/hw/acpi/acpi_dev_interface.h
@@ -15,6 +15,7 @@ typedef enum {
     ACPI_VMGENID_CHANGE_STATUS = 32,
     ACPI_POWER_DOWN_STATUS = 64,
     ACPI_BATTERY_CHANGE_STATUS = 128,
+    ACPI_AC_ADAPTER_CHANGE_STATUS = 1024,
 } AcpiEventStatusBits;
 
 #define TYPE_ACPI_DEVICE_IF "acpi-device-interface"
