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>

6 files changed, 80 insertions, 0 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 9cc662c7e744..c16fc4fb13bf 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -150,6 +150,13 @@ config HID_GYRATION
         ---help---
         Support for Gyration remote control.
 
+config HID_KENSINGTON
+        tristate "Kensington" if EMBEDDED
+        depends on USB_HID
+        default !EMBEDDED
+        ---help---
+        Support for Kensington Slimblade Trackball.
+
 config HID_LOGITECH
         tristate "Logitech" if EMBEDDED
         depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index 0fdbda697991..53e133146b58 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_HID_CYPRESS)	+= hid-cypress.o
 obj-$(CONFIG_DRAGONRISE_FF)     += hid-drff.o
 obj-$(CONFIG_HID_EZKEY)         += hid-ezkey.o
 obj-$(CONFIG_HID_GYRATION)      += hid-gyration.o
+obj-$(CONFIG_HID_KENSINGTON)    += hid-kensington.o
 obj-$(CONFIG_HID_LOGITECH)      += hid-logitech.o
 obj-$(CONFIG_HID_MICROSOFT)     += hid-microsoft.o
 obj-$(CONFIG_HID_MONTEREY)      += hid-monterey.o
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 7bc2f3744e77..646ba221c00b 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1270,6 +1270,7 @@ static const struct hid_device_id hid_blacklist[] = {
         { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012) },
         { HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE) },
         { HID_USB_DEVICE(USB_VENDOR_ID_GYRATION, USB_DEVICE_ID_GYRATION_REMOTE_2) },
+        { HID_USB_DEVICE(USB_VENDOR_ID_KENSINGTON, USB_DEVICE_ID_KS_SLIMBLADE) },
         { HID_USB_DEVICE(USB_VENDOR_ID_LABTEC, USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD) },
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER) },
         { HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER) },
diff --git a/drivers/hid/hid-dummy.c b/drivers/hid/hid-dummy.c
index 536aa15af281..28815fd6c285 100644
--- a/drivers/hid/hid-dummy.c
+++ b/drivers/hid/hid-dummy.c
@@ -37,6 +37,9 @@ static int __init hid_dummy_init(void)
 #ifdef CONFIG_HID_GYRATION_MODULE
         HID_COMPAT_CALL_DRIVER(gyration);
 #endif
+#ifdef CONFIG_HID_KENSINGTON_MODULE
+        HID_COMPAT_CALL_DRIVER(kensington);
+#endif
 #ifdef CONFIG_HID_LOGITECH_MODULE
         HID_COMPAT_CALL_DRIVER(logitech);
 #endif
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 9e83ca41dd70..7270ccc484ab 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -274,6 +274,9 @@
 #define USB_DEVICE_ID_LD_POWERCONTROL   0x2030
 #define USB_DEVICE_ID_LD_MACHINETEST    0x2040
 
+#define USB_VENDOR_ID_KENSINGTON        0x047d
+#define USB_DEVICE_ID_KS_SLIMBLADE      0x2041
+
 #define USB_VENDOR_ID_LOGITECH          0x046d
 #define USB_DEVICE_ID_LOGITECH_RECEIVER 0xc101
 #define USB_DEVICE_ID_LOGITECH_HARMONY_FIRST  0xc110
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);