ideapad: add platform driver for ideapad

Create /sys/devices/platform/ideapad for nodes of ideapad landing.

Signed-off-by: Ike Panhc <ike.pan@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 47 insertions, 7 deletions

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 5ff12205aa6b..5998ae14a220 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -27,6 +27,7 @@
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <linux/rfkill.h>
+#include <linux/platform_device.h>
 
 #define IDEAPAD_DEV_CAMERA      0
 #define IDEAPAD_DEV_WLAN        1
@@ -37,6 +38,7 @@
 struct ideapad_private {
         acpi_handle handle;
         struct rfkill *rfk[5];
+        struct platform_device *platform_device;
 } *ideapad_priv;
 
 static struct {
@@ -277,6 +279,35 @@ static void ideapad_unregister_rfkill(struct acpi_device *adevice, int dev)
         rfkill_destroy(priv->rfk[dev]);
 }
 
+/*
+ * Platform device
+ */
+static int __devinit ideapad_platform_init(void)
+{
+        int result;
+
+        ideapad_priv->platform_device = platform_device_alloc("ideapad", -1);
+        if (!ideapad_priv->platform_device)
+                return -ENOMEM;
+        platform_set_drvdata(ideapad_priv->platform_device, ideapad_priv);
+
+        result = platform_device_add(ideapad_priv->platform_device);
+        if (result)
+                goto fail_platform_device;
+
+        return 0;
+
+fail_platform_device:
+        platform_device_put(ideapad_priv->platform_device);
+        return result;
+}
+
+static void ideapad_platform_exit(void)
+{
+        platform_device_unregister(ideapad_priv->platform_device);
+}
+/* the above is platform device */
+
 static const struct acpi_device_id ideapad_device_ids[] = {
         { "VPC2004", 0},
         { "", 0},
@@ -285,7 +316,7 @@ MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 
 static int ideapad_acpi_add(struct acpi_device *adevice)
 {
-        int i, cfg;
+        int ret, i, cfg;
         int devs_present[5];
         struct ideapad_private *priv;
 
@@ -305,18 +336,20 @@ static int ideapad_acpi_add(struct acpi_device *adevice)
         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
         if (!priv)
                 return -ENOMEM;
+        ideapad_priv = priv;
+
+        ret = ideapad_platform_init();
+        if (ret)
+                goto platform_failed;
 
         if (devs_present[IDEAPAD_DEV_CAMERA]) {
-                int ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
-                if (ret) {
-                        kfree(priv);
-                        return ret;
-                }
+                ret = device_create_file(&adevice->dev, &dev_attr_camera_power);
+                if (ret)
+                        goto camera_failed;
         }
 
         priv->handle = adevice->handle;
         dev_set_drvdata(&adevice->dev, priv);
-        ideapad_priv = priv;
         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++) {
                 if (!devs_present[i])
                         continue;
@@ -325,6 +358,12 @@ static int ideapad_acpi_add(struct acpi_device *adevice)
         }
         ideapad_sync_rfk_state(adevice);
         return 0;
+
+camera_failed:
+        ideapad_platform_exit();
+platform_failed:
+        kfree(priv);
+        return ret;
 }
 
 static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
@@ -337,6 +376,7 @@ static int ideapad_acpi_remove(struct acpi_device *adevice, int type)
         for (i = IDEAPAD_DEV_WLAN; i <= IDEAPAD_DEV_KILLSW; i++)
                 ideapad_unregister_rfkill(adevice, i);
 
+        ideapad_platform_exit();
         dev_set_drvdata(&adevice->dev, NULL);
         kfree(priv);
         return 0;