ideapad: add hotkey support

Hotkey enabled by this patch:
  Fn+F3: Video mode switch
  Fn+F5: software rfkill for wifi

For some ideapad when push Fn+F3, hardware generates Super-P keys, those key
will not be enabled by this patch.

Thanks for Dave Hansen report the problem. If CONFIG_INPUT_SPARSEKMAP is not
set, when building, you will have error message:

  ERROR: "sparse_keymap_setup" [drivers/platform/x86/ideapad-laptop.ko] undefined!
  ERROR: "sparse_keymap_free" [drivers/platform/x86/ideapad-laptop.ko] undefined!
  ERROR: "sparse_keymap_report_event" [drivers/platform/x86/ideapad-laptop.ko] undefined!

To select INPUT_SPARSEKMAP solve this issue.

Ref: http://lkml.org/lkml/2010/12/2/340

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

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 49f207fc61d..04b4f5b3114 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -28,6 +28,8 @@
 #include <acpi/acpi_drivers.h>
 #include <linux/rfkill.h>
 #include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
 
 #define IDEAPAD_DEV_CAMERA      0
 #define IDEAPAD_DEV_WLAN        1
@@ -39,6 +41,7 @@ struct ideapad_private {
         acpi_handle handle;
         struct rfkill *rfk[5];
         struct platform_device *platform_device;
+        struct input_dev *inputdev;
 } *ideapad_priv;
 
 static struct {
@@ -325,6 +328,66 @@ static void ideapad_platform_exit(void)
 }
 /* the above is platform device */
 
+/*
+ * input device
+ */
+static const struct key_entry ideapad_keymap[] = {
+        { KE_KEY, 0x06, { KEY_SWITCHVIDEOMODE } },
+        { KE_KEY, 0x0D, { KEY_WLAN } },
+        { KE_END, 0 },
+};
+
+static int __devinit ideapad_input_init(void)
+{
+        struct input_dev *inputdev;
+        int error;
+
+        inputdev = input_allocate_device();
+        if (!inputdev) {
+                pr_info("Unable to allocate input device\n");
+                return -ENOMEM;
+        }
+
+        inputdev->name = "Ideapad extra buttons";
+        inputdev->phys = "ideapad/input0";
+        inputdev->id.bustype = BUS_HOST;
+        inputdev->dev.parent = &ideapad_priv->platform_device->dev;
+
+        error = sparse_keymap_setup(inputdev, ideapad_keymap, NULL);
+        if (error) {
+                pr_err("Unable to setup input device keymap\n");
+                goto err_free_dev;
+        }
+
+        error = input_register_device(inputdev);
+        if (error) {
+                pr_err("Unable to register input device\n");
+                goto err_free_keymap;
+        }
+
+        ideapad_priv->inputdev = inputdev;
+        return 0;
+
+err_free_keymap:
+        sparse_keymap_free(inputdev);
+err_free_dev:
+        input_free_device(inputdev);
+        return error;
+}
+
+static void __devexit ideapad_input_exit(void)
+{
+        sparse_keymap_free(ideapad_priv->inputdev);
+        input_unregister_device(ideapad_priv->inputdev);
+        ideapad_priv->inputdev = NULL;
+}
+
+static void ideapad_input_report(unsigned long scancode)
+{
+        sparse_keymap_report_event(ideapad_priv->inputdev, scancode, 1, true);
+}
+/* the above is input device */
+
 static const struct acpi_device_id ideapad_device_ids[] = {
         { "VPC2004", 0},
         { "", 0},
@@ -350,6 +413,10 @@ static int ideapad_acpi_add(struct acpi_device *adevice)
         if (ret)
                 goto platform_failed;
 
+        ret = ideapad_input_init();
+        if (ret)
+                goto input_failed;
+
         for (i = IDEAPAD_DEV_WLAN; i < IDEAPAD_DEV_KILLSW; i++) {
                 if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
                         ideapad_register_rfkill(adevice, i);
@@ -358,6 +425,8 @@ static int ideapad_acpi_add(struct acpi_device *adevice)
 
         return 0;
 
+input_failed:
+        ideapad_platform_exit();
 platform_failed:
         kfree(priv);
         return ret;
@@ -370,6 +439,7 @@ 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_input_exit();
         ideapad_platform_exit();
         dev_set_drvdata(&adevice->dev, NULL);
         kfree(priv);
@@ -392,6 +462,8 @@ static void ideapad_acpi_notify(struct acpi_device *adevice, u32 event)
                 if (test_bit(vpc_bit, &vpc1)) {
                         if (vpc_bit == 9)
                                 ideapad_sync_rfk_state(adevice);
+                        else
+                                ideapad_input_report(vpc_bit);
                 }
         }
 }