sony-laptop: add panel_id function

Signed-off-by: Javier Achirica <jachirica@gmail.com>
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

1 files changed, 59 insertions, 0 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index de173909257a..d1f712e368ce 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_panelid_setup(struct platform_device *pd);
+static void sony_nc_panelid_cleanup(struct platform_device *pd);
+
 static int sony_nc_touchpad_setup(struct platform_device *pd,
                                   unsigned int handle);
 static void sony_nc_touchpad_cleanup(struct platform_device *pd);
@@ -1385,6 +1388,12 @@ static void sony_nc_function_setup(struct acpi_device *device,
                                 pr_err("couldn't set up keyboard backlight function (%d)\n",
                                                 result);
                         break;
+                case 0x011D:
+                        result = sony_nc_panelid_setup(pf_device);
+                        if (result)
+                                pr_err("couldn't set up panel ID function (%d)\n",
+                                       result);
+                        break;
                 default:
                         continue;
                 }
@@ -1449,6 +1458,9 @@ static void sony_nc_function_cleanup(struct platform_device *pd)
                 case 0x0163:
                         sony_nc_kbd_backlight_cleanup(pd, handle);
                         break;
+                case 0x011D:
+                        sony_nc_panelid_cleanup(pd);
+                        break;
                 default:
                         continue;
                 }
@@ -2540,6 +2552,53 @@ static void sony_nc_highspeed_charging_cleanup(struct platform_device *pd)
         }
 }
 
+/* Panel ID function */
+static struct device_attribute *panel_handle;
+
+static ssize_t sony_nc_panelid_show(struct device *dev,
+                struct device_attribute *attr, char *buffer)
+{
+        unsigned int result;
+
+        if (sony_call_snc_handle(0x011D, 0x0000, &result))
+                return -EIO;
+
+        return snprintf(buffer, PAGE_SIZE, "%d\n", result);
+}
+
+static int sony_nc_panelid_setup(struct platform_device *pd)
+{
+        unsigned int result;
+
+        panel_handle = kzalloc(sizeof(struct device_attribute), GFP_KERNEL);
+        if (!panel_handle)
+                return -ENOMEM;
+
+        sysfs_attr_init(&panel_handle->attr);
+        panel_handle->attr.name = "panel_id";
+        panel_handle->attr.mode = S_IRUGO;
+        panel_handle->show = sony_nc_panelid_show;
+        panel_handle->store = NULL;
+
+        result = device_create_file(&pd->dev, panel_handle);
+        if (result) {
+                kfree(panel_handle);
+                panel_handle = NULL;
+                return result;
+        }
+
+        return 0;
+}
+
+static void sony_nc_panelid_cleanup(struct platform_device *pd)
+{
+        if (panel_handle) {
+                device_remove_file(&pd->dev, panel_handle);
+                kfree(panel_handle);
+                panel_handle = NULL;
+        }
+}
+
 /* Touchpad enable/disable */
 struct touchpad_control {
         struct device_attribute attr;