sony-laptop: add smart connect control function

The current value is not available through the SNC device and therefore
the attribute is writable only.

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, 67 insertions, 0 deletions

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 48e7e5bdadbf..19d769e0d774 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -177,6 +177,9 @@ static void sony_nc_usb_charge_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_smart_conn_setup(struct platform_device *pd);
+static void sony_nc_smart_conn_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);
@@ -1422,6 +1425,12 @@ static void sony_nc_function_setup(struct acpi_device *device,
                                 pr_err("couldn't set up panel ID function (%d)\n",
                                        result);
                         break;
+                case 0x0168:
+                        result = sony_nc_smart_conn_setup(pf_device);
+                        if (result)
+                                pr_err("couldn't set up smart connect support (%d)\n",
+                                                result);
+                        break;
                 default:
                         continue;
                 }
@@ -1498,6 +1507,9 @@ static void sony_nc_function_cleanup(struct platform_device *pd)
                 case 0x011D:
                         sony_nc_panelid_cleanup(pd);
                         break;
+                case 0x0168:
+                        sony_nc_smart_conn_cleanup(pd);
+                        break;
                 default:
                         continue;
                 }
@@ -2885,6 +2897,61 @@ static void sony_nc_panelid_cleanup(struct platform_device *pd)
         }
 }
 
+/* smart connect function */
+static struct device_attribute *sc_handle;
+
+static ssize_t sony_nc_smart_conn_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(0x0168, value << 0x10, &result))
+                return -EIO;
+
+        return count;
+}
+
+static int sony_nc_smart_conn_setup(struct platform_device *pd)
+{
+        unsigned int result;
+
+        sc_handle = kzalloc(sizeof(struct device_attribute), GFP_KERNEL);
+        if (!sc_handle)
+                return -ENOMEM;
+
+        sysfs_attr_init(&sc_handle->attr);
+        sc_handle->attr.name = "smart_connect";
+        sc_handle->attr.mode = S_IWUSR;
+        sc_handle->show = NULL;
+        sc_handle->store = sony_nc_smart_conn_store;
+
+        result = device_create_file(&pd->dev, sc_handle);
+        if (result) {
+                kfree(sc_handle);
+                sc_handle = NULL;
+                return result;
+        }
+
+        return 0;
+}
+
+static void sony_nc_smart_conn_cleanup(struct platform_device *pd)
+{
+        if (sc_handle) {
+                device_remove_file(&pd->dev, sc_handle);
+                kfree(sc_handle);
+                sc_handle = NULL;
+        }
+}
+
 /* Touchpad enable/disable */
 struct touchpad_control {
         struct device_attribute attr;