1 files changed, 162 insertions, 0 deletions

diff --git a/drivers/hid/hid-a4tech.c b/drivers/hid/hid-a4tech.c
new file mode 100644
index 000000000000..ebca00e6c103
--- /dev/null
+++ b/drivers/hid/hid-a4tech.c
@@ -0,0 +1,162 @@
+/*
+ *  HID driver for some a4tech "special" devices
+ *
+ *  Copyright (c) 1999 Andreas Gal
+ *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ *  Copyright (c) 2006-2007 Jiri Kosina
+ *  Copyright (c) 2007 Paul Walmsley
+ *  Copyright (c) 2008 Jiri Slaby
+ */
+
+/*
+ * 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 A4_2WHEEL_MOUSE_HACK_7  0x01
+#define A4_2WHEEL_MOUSE_HACK_B8 0x02
+
+struct a4tech_sc {
+        unsigned long quirks;
+        unsigned int hw_wheel;
+        __s32 delayed_value;
+};
+
+static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+                struct hid_field *field, struct hid_usage *usage,
+                unsigned long **bit, int *max)
+{
+        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
+
+        if (usage->type == EV_REL && usage->code == REL_WHEEL)
+                set_bit(REL_HWHEEL, *bit);
+
+        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
+                return -1;
+
+        return 0;
+}
+
+static int a4_event(struct hid_device *hdev, struct hid_field *field,
+                struct hid_usage *usage, __s32 value)
+{
+        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
+        struct input_dev *input;
+
+        if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
+                        !usage->type)
+                return 0;
+
+        input = field->hidinput->input;
+
+        if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
+                if (usage->type == EV_REL && usage->code == REL_WHEEL) {
+                        a4->delayed_value = value;
+                        return 1;
+                }
+
+                if (usage->hid == 0x000100b8) {
+                        input_event(input, EV_REL, value ? REL_HWHEEL :
+                                        REL_WHEEL, a4->delayed_value);
+                        return 1;
+                }
+        }
+
+        if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
+                a4->hw_wheel = !!value;
+                return 1;
+        }
+
+        if (usage->code == REL_WHEEL && a4->hw_wheel) {
+                input_event(input, usage->type, REL_HWHEEL, value);
+                return 1;
+        }
+
+        return 0;
+}
+
+static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+        struct a4tech_sc *a4;
+        int ret;
+
+        a4 = kzalloc(sizeof(*a4), GFP_KERNEL);
+        if (a4 == NULL) {
+                dev_err(&hdev->dev, "can't alloc device descriptor\n");
+                ret = -ENOMEM;
+                goto err_free;
+        }
+
+        a4->quirks = id->driver_data;
+
+        hid_set_drvdata(hdev, a4);
+
+        ret = hid_parse(hdev);
+        if (ret) {
+                dev_err(&hdev->dev, "parse failed\n");
+                goto err_free;
+        }
+
+        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+        if (ret) {
+                dev_err(&hdev->dev, "hw start failed\n");
+                goto err_free;
+        }
+
+        return 0;
+err_free:
+        kfree(a4);
+        return ret;
+}
+
+static void a4_remove(struct hid_device *hdev)
+{
+        struct a4tech_sc *a4 = hid_get_drvdata(hdev);
+
+        hid_hw_stop(hdev);
+        kfree(a4);
+}
+
+static const struct hid_device_id a4_devices[] = {
+        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
+                .driver_data = A4_2WHEEL_MOUSE_HACK_7 },
+        { HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
+                .driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
+        { }
+};
+MODULE_DEVICE_TABLE(hid, a4_devices);
+
+static struct hid_driver a4_driver = {
+        .name = "a4tech",
+        .id_table = a4_devices,
+        .input_mapped = a4_input_mapped,
+        .event = a4_event,
+        .probe = a4_probe,
+        .remove = a4_remove,
+};
+
+static int a4_init(void)
+{
+        return hid_register_driver(&a4_driver);
+}
+
+static void a4_exit(void)
+{
+        hid_unregister_driver(&a4_driver);
+}
+
+module_init(a4_init);
+module_exit(a4_exit);
+MODULE_LICENSE("GPL");
+
+HID_COMPAT_LOAD_DRIVER(a4tech);