2 files changed, 31 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index b78663fc334..699d546623b 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -439,6 +439,7 @@ struct nouveau_pm_engine {
         struct nouveau_pm_level *cur;
 
         struct device *hwmon;
+        struct notifier_block acpi_nb;
 
         int (*clock_get)(struct drm_device *, u32 id);
         void *(*clock_pre)(struct drm_device *, struct nouveau_pm_level *,
diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.c b/drivers/gpu/drm/nouveau/nouveau_pm.c
index 9f7b158f582..d93814160bc 100644
--- a/drivers/gpu/drm/nouveau/nouveau_pm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_pm.c
@@ -27,6 +27,10 @@
 #include "nouveau_drv.h"
 #include "nouveau_pm.h"
 
+#ifdef CONFIG_ACPI
+#include <linux/acpi.h>
+#endif
+#include <linux/power_supply.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 
@@ -446,6 +450,25 @@ nouveau_hwmon_fini(struct drm_device *dev)
 #endif
 }
 
+#ifdef CONFIG_ACPI
+static int
+nouveau_pm_acpi_event(struct notifier_block *nb, unsigned long val, void *data)
+{
+        struct drm_nouveau_private *dev_priv =
+                container_of(nb, struct drm_nouveau_private, engine.pm.acpi_nb);
+        struct drm_device *dev = dev_priv->dev;
+        struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
+
+        if (strcmp(entry->device_class, "ac_adapter") == 0) {
+                bool ac = power_supply_is_system_supplied();
+
+                NV_DEBUG(dev, "power supply changed: %s\n", ac ? "AC" : "DC");
+        }
+
+        return NOTIFY_OK;
+}
+#endif
+
 int
 nouveau_pm_init(struct drm_device *dev)
 {
@@ -485,6 +508,10 @@ nouveau_pm_init(struct drm_device *dev)
 
         nouveau_sysfs_init(dev);
         nouveau_hwmon_init(dev);
+#ifdef CONFIG_ACPI
+        pm->acpi_nb.notifier_call = nouveau_pm_acpi_event;
+        register_acpi_notifier(&pm->acpi_nb);
+#endif
 
         return 0;
 }
@@ -503,6 +530,9 @@ nouveau_pm_fini(struct drm_device *dev)
         nouveau_perf_fini(dev);
         nouveau_volt_fini(dev);
 
+#ifdef CONFIG_ACPI
+        unregister_acpi_notifier(&pm->acpi_nb);
+#endif
         nouveau_hwmon_fini(dev);
         nouveau_sysfs_fini(dev);
 }