1/*
2 *  Force feedback support for Zeroplus based devices
3 *
4 *  Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23
24#include <linux/hid.h>
25#include <linux/input.h>
26#include <linux/slab.h>
27#include <linux/module.h>
28
29#include "hid-ids.h"
30
31#ifdef CONFIG_ZEROPLUS_FF
32
33struct zpff_device {
34	struct hid_report *report;
35};
36
37static int zpff_play(struct input_dev *dev, void *data,
38			 struct ff_effect *effect)
39{
40	struct hid_device *hid = input_get_drvdata(dev);
41	struct zpff_device *zpff = data;
42	int left, right;
43
44	/*
45	 * The following is specified the other way around in the Zeroplus
46	 * datasheet but the order below is correct for the XFX Executioner;
47	 * however it is possible that the XFX Executioner is an exception
48	 */
49
50	left = effect->u.rumble.strong_magnitude;
51	right = effect->u.rumble.weak_magnitude;
52	dbg_hid("called with 0x%04x 0x%04x\n", left, right);
53
54	left = left * 0x7f / 0xffff;
55	right = right * 0x7f / 0xffff;
56
57	zpff->report->field[2]->value[0] = left;
58	zpff->report->field[3]->value[0] = right;
59	dbg_hid("running with 0x%02x 0x%02x\n", left, right);
60	hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
61
62	return 0;
63}
64
65static int zpff_init(struct hid_device *hid)
66{
67	struct zpff_device *zpff;
68	struct hid_report *report;
69	struct hid_input *hidinput = list_entry(hid->inputs.next,
70						struct hid_input, list);
71	struct input_dev *dev = hidinput->input;
72	int i, error;
73
74	for (i = 0; i < 4; i++) {
75		report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
76		if (!report)
77			return -ENODEV;
78	}
79
80	zpff = kzalloc(sizeof(struct zpff_device), GFP_KERNEL);
81	if (!zpff)
82		return -ENOMEM;
83
84	set_bit(FF_RUMBLE, dev->ffbit);
85
86	error = input_ff_create_memless(dev, zpff, zpff_play);
87	if (error) {
88		kfree(zpff);
89		return error;
90	}
91
92	zpff->report = report;
93	zpff->report->field[0]->value[0] = 0x00;
94	zpff->report->field[1]->value[0] = 0x02;
95	zpff->report->field[2]->value[0] = 0x00;
96	zpff->report->field[3]->value[0] = 0x00;
97	hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);
98
99	hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");
100
101	return 0;
102}
103#else
104static inline int zpff_init(struct hid_device *hid)
105{
106	return 0;
107}
108#endif
109
110static int zp_probe(struct hid_device *hdev, const struct hid_device_id *id)
111{
112	int ret;
113
114	ret = hid_parse(hdev);
115	if (ret) {
116		hid_err(hdev, "parse failed\n");
117		goto err;
118	}
119
120	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
121	if (ret) {
122		hid_err(hdev, "hw start failed\n");
123		goto err;
124	}
125
126	zpff_init(hdev);
127
128	return 0;
129err:
130	return ret;
131}
132
133static const struct hid_device_id zp_devices[] = {
134	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
135	{ HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
136	{ }
137};
138MODULE_DEVICE_TABLE(hid, zp_devices);
139
140static struct hid_driver zp_driver = {
141	.name = "zeroplus",
142	.id_table = zp_devices,
143	.probe = zp_probe,
144};
145module_hid_driver(zp_driver);
146
147MODULE_LICENSE("GPL");
148