1 files changed, 28 insertions, 9 deletions

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 3188da3df8da..a41be56c1cc0 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -182,6 +182,24 @@ EXPORT_SYMBOL(acpi_bus_get_private_data);
                                  Power Management
    -------------------------------------------------------------------------- */
 
+static const char *state_string(int state)
+{
+        switch (state) {
+        case ACPI_STATE_D0:
+                return "D0";
+        case ACPI_STATE_D1:
+                return "D1";
+        case ACPI_STATE_D2:
+                return "D2";
+        case ACPI_STATE_D3_HOT:
+                return "D3hot";
+        case ACPI_STATE_D3_COLD:
+                return "D3";
+        default:
+                return "(unknown)";
+        }
+}
+
 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 {
         int result = 0;
@@ -215,8 +233,8 @@ static int __acpi_bus_get_power(struct acpi_device *device, int *state)
                         device->parent->power.state : ACPI_STATE_D0;
         }
 
-        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
-                          device->pnp.bus_id, *state));
+        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
+                          device->pnp.bus_id, state_string(*state)));
 
         return 0;
 }
@@ -234,13 +252,14 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
         /* Make sure this is a valid target state */
 
         if (state == device->power.state) {
-                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
-                                  state));
+                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
+                                  state_string(state)));
                 return 0;
         }
 
         if (!device->power.states[state].flags.valid) {
-                printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
+                printk(KERN_WARNING PREFIX "Device does not support %s\n",
+                       state_string(state));
                 return -ENODEV;
         }
         if (device->parent && (state < device->parent->power.state)) {
@@ -294,13 +313,13 @@ static int __acpi_bus_set_power(struct acpi_device *device, int state)
       end:
         if (result)
                 printk(KERN_WARNING PREFIX
-                              "Device [%s] failed to transition to D%d\n",
-                              device->pnp.bus_id, state);
+                              "Device [%s] failed to transition to %s\n",
+                              device->pnp.bus_id, state_string(state));
         else {
                 device->power.state = state;
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-                                  "Device [%s] transitioned to D%d\n",
-                                  device->pnp.bus_id, state));
+                                  "Device [%s] transitioned to %s\n",
+                                  device->pnp.bus_id, state_string(state)));
         }
 
         return result;