1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 7b5a56d59bac..ba39a29a9f39 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -164,6 +164,9 @@ static int __sony_nc_gfx_switch_status_get(void);
 static int sony_nc_highspeed_charging_setup(struct platform_device *pd);
 static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd);
 
+static int sony_nc_lowbatt_setup(struct platform_device *pd);
+static void sony_nc_lowbatt_cleanup(struct platform_device *pd);
+
 static int sony_nc_fanspeed_setup(struct platform_device *pd);
 static void sony_nc_fanspeed_cleanup(struct platform_device *pd);
 
@@ -1394,6 +1397,12 @@ static void sony_nc_function_setup(struct acpi_device *device,
                                 pr_err("couldn't set up keyboard backlight function (%d)\n",
                                                 result);
                         break;
+                case 0x0121:
+                        result = sony_nc_lowbatt_setup(pf_device);
+                        if (result)
+                                pr_err("couldn't set up low battery function (%d)\n",
+                                       result);
+                        break;
                 case 0x0149:
                         result = sony_nc_fanspeed_setup(pf_device);
                         if (result)
@@ -1476,6 +1485,9 @@ static void sony_nc_function_cleanup(struct platform_device *pd)
                 case 0x0163:
                         sony_nc_kbd_backlight_cleanup(pd, handle);
                         break;
+                case 0x0121:
+                        sony_nc_lowbatt_cleanup(pd);
+                        break;
                 case 0x0149:
                         sony_nc_fanspeed_cleanup(pd);
                         break;
@@ -2576,6 +2588,72 @@ static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd)
         }
 }
 
+/* low battery function */
+static struct device_attribute *lowbatt_handle;
+
+static ssize_t sony_nc_lowbatt_store(struct device *dev,
+                struct device_attribute *attr,
+                const char *buffer, size_t count)
+{
+        unsigned int result;
+        unsigned long value;
+
+        if (count > 31)
+                return -EINVAL;
+
+        if (kstrtoul(buffer, 10, &value) || value > 1)
+                return -EINVAL;
+
+        if (sony_call_snc_handle(0x0121, value << 8, &result))
+                return -EIO;
+
+        return count;
+}
+
+static ssize_t sony_nc_lowbatt_show(struct device *dev,
+                struct device_attribute *attr, char *buffer)
+{
+        unsigned int result;
+
+        if (sony_call_snc_handle(0x0121, 0x0200, &result))
+                return -EIO;
+
+        return snprintf(buffer, PAGE_SIZE, "%d\n", result & 1);
+}
+
+static int sony_nc_lowbatt_setup(struct platform_device *pd)
+{
+        unsigned int result;
+
+        lowbatt_handle = kzalloc(sizeof(struct device_attribute), GFP_KERNEL);
+        if (!lowbatt_handle)
+                return -ENOMEM;
+
+        sysfs_attr_init(&lowbatt_handle->attr);
+        lowbatt_handle->attr.name = "lowbatt_hibernate";
+        lowbatt_handle->attr.mode = S_IRUGO | S_IWUSR;
+        lowbatt_handle->show = sony_nc_lowbatt_show;
+        lowbatt_handle->store = sony_nc_lowbatt_store;
+
+        result = device_create_file(&pd->dev, lowbatt_handle);
+        if (result) {
+                kfree(lowbatt_handle);
+                lowbatt_handle = NULL;
+                return result;
+        }
+
+        return 0;
+}
+
+static void sony_nc_lowbatt_cleanup(struct platform_device *pd)
+{
+        if (lowbatt_handle) {
+                device_remove_file(&pd->dev, lowbatt_handle);
+                kfree(lowbatt_handle);
+                lowbatt_handle = NULL;
+        }
+}
+
 /* fan speed function */
 static struct device_attribute *fan_handle, *hsf_handle;