HID: support for Kensington slimblade device

0x47d/0x2041 device sends two extra buttons in 0xff00 usage
page and therefore requires special handling.

Reported-by: Jason Noble <nobleja@polezero.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 65 insertions, 0 deletions

diff --git a/drivers/hid/hid-kensington.c b/drivers/hid/hid-kensington.c
new file mode 100644
index 000000000000..747fee5b2a73
--- /dev/null
+++ b/drivers/hid/hid-kensington.c
@@ -0,0 +1,65 @@
+/*
+ *  HID driver for Kensigton Slimblade Trackball
+ *
+ *  Copyright (c) 2009 Jiri Kosina
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/input.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#define ks_map_key(c)   hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
+
+static int ks_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+                struct hid_field *field, struct hid_usage *usage,
+                unsigned long **bit, int *max)
+{
+        if ((usage->hid & HID_USAGE_PAGE) != HID_UP_MSVENDOR)
+                return 0;
+
+        switch (usage->hid & HID_USAGE) {
+        case 0x01: ks_map_key(BTN_MIDDLE);      break;
+        case 0x02: ks_map_key(BTN_SIDE);        break;
+        default:
+                return 0;
+        }
+        return 1;
+}
+
+static const struct hid_device_id ks_devices[] = {
+        { HID_USB_DEVICE(USB_VENDOR_ID_KENSINGTON, USB_DEVICE_ID_KS_SLIMBLADE) },
+        { }
+};
+MODULE_DEVICE_TABLE(hid, ks_devices);
+
+static struct hid_driver ks_driver = {
+        .name = "kensington",
+        .id_table = ks_devices,
+        .input_mapping = ks_input_mapping,
+};
+
+static int ks_init(void)
+{
+        return hid_register_driver(&ks_driver);
+}
+
+static void ks_exit(void)
+{
+        hid_unregister_driver(&ks_driver);
+}
+
+module_init(ks_init);
+module_exit(ks_exit);
+MODULE_LICENSE("GPL");
+
+HID_COMPAT_LOAD_DRIVER(kensington);