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+/*
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+ * Force feedback support for ACRUX game controllers
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+ *
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+ * From what I have gathered, these devices are mass produced in China
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+ * by several vendors. They often share the same design as the original
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+ * Xbox 360 controller.
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+ *
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+ * 1a34:0802 "ACRUX USB GAMEPAD 8116"
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+ * - tested with a EXEQ EQ-PCU-02090 game controller.
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+ *
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+ * Copyright (c) 2010 Sergei Kolzun <x0r@dv-life.ru>
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+ */
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+
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+/*
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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+ */
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+
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+#include <linux/input.h>
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+#include <linux/slab.h>
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+#include <linux/usb.h>
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+#include <linux/hid.h>
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+
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+#include "hid-ids.h"
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+#include "usbhid/usbhid.h"
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+
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+struct axff_device {
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+ struct hid_report *report;
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+};
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+
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+static int axff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
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+{
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+ struct hid_device *hid = input_get_drvdata(dev);
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+ struct axff_device *axff = data;
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+ int left, right;
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+
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+ left = effect->u.rumble.strong_magnitude;
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+ right = effect->u.rumble.weak_magnitude;
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+
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+ dbg_hid("called with 0x%04x 0x%04x", left, right);
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+
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+ left = left * 0xff / 0xffff;
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+ right = right * 0xff / 0xffff;
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+
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+ axff->report->field[0]->value[0] = left;
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+ axff->report->field[1]->value[0] = right;
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+ axff->report->field[2]->value[0] = left;
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+ axff->report->field[3]->value[0] = right;
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+ dbg_hid("running with 0x%02x 0x%02x", left, right);
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+ usbhid_submit_report(hid, axff->report, USB_DIR_OUT);
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+
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+ return 0;
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+}
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+
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+static int axff_init(struct hid_device *hid)
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+{
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+ struct axff_device *axff;
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+ struct hid_report *report;
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+ struct hid_input *hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
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+ struct list_head *report_list =&hid->report_enum[HID_OUTPUT_REPORT].report_list;
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+ struct input_dev *dev = hidinput->input;
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+ int error;
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+
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+ if (list_empty(report_list)) {
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+ dev_err(&hid->dev, "no output reports found\n");
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+ return -ENODEV;
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+ }
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+
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+ report = list_first_entry(report_list, struct hid_report, list);
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+
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+ if (report->maxfield < 4) {
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+ dev_err(&hid->dev, "no fields in the report: %d\n", report->maxfield);
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+ return -ENODEV;
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+ }
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+
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+ axff = kzalloc(sizeof(struct axff_device), GFP_KERNEL);
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+ if (!axff)
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+ return -ENOMEM;
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+
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+ set_bit(FF_RUMBLE, dev->ffbit);
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+
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+ error = input_ff_create_memless(dev, axff, axff_play);
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+ if (error)
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+ goto err_free_mem;
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+
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+ axff->report = report;
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+ axff->report->field[0]->value[0] = 0x00;
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+ axff->report->field[1]->value[0] = 0x00;
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+ axff->report->field[2]->value[0] = 0x00;
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+ axff->report->field[3]->value[0] = 0x00;
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+ usbhid_submit_report(hid, axff->report, USB_DIR_OUT);
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+
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+ dev_info(&hid->dev, "Force Feedback for ACRUX game controllers by Sergei Kolzun<x0r@dv-life.ru>\n");
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+
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+ return 0;
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+
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+err_free_mem:
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+ kfree(axff);
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+ return error;
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+}
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+
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+static int ax_probe(struct hid_device *hdev, const struct hid_device_id *id)
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+{
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+ int error;
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+
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+ dev_dbg(&hdev->dev, "ACRUX HID hardware probe...");
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+
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+ error = hid_parse(hdev);
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+ if (error) {
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+ dev_err(&hdev->dev, "parse failed\n");
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+ return error;
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+ }
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+
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+ error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
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+ if (error) {
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+ dev_err(&hdev->dev, "hw start failed\n");
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+ return error;
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+ }
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+
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+ error = axff_init(hdev);
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+ if (error) {
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+ /*
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+ * Do not fail device initialization completely as device
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+ * may still be partially operable, just warn.
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+ */
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+ dev_warn(&hdev->dev,
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+ "Failed to enable force feedback support, error: %d\n",
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+ error);
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+ }
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+
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+ return 0;
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+}
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+
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+static const struct hid_device_id ax_devices[] = {
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+ { HID_USB_DEVICE(USB_VENDOR_ID_ACRUX, 0x0802), },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(hid, ax_devices);
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+
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+static struct hid_driver ax_driver = {
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+ .name = "acrux",
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+ .id_table = ax_devices,
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+ .probe = ax_probe,
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+};
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+
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+static int __init ax_init(void)
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+{
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+ return hid_register_driver(&ax_driver);
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+}
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+
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+static void __exit ax_exit(void)
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+{
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+ hid_unregister_driver(&ax_driver);
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+}
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+
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+module_init(ax_init);
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+module_exit(ax_exit);
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+
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+MODULE_AUTHOR("Sergei Kolzun");
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+MODULE_DESCRIPTION("Force feedback support for ACRUX game controllers");
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+MODULE_LICENSE("GPL");
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Sergei Kolzun