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Anssi Hannulad946e652011-06-27 00:07:31 +03001/*
2 * Force feedback support for Holtek On Line Grip based gamepads
3 *
4 * These include at least a Brazilian "Clone Joypad Super Power Fire"
5 * which uses vendor ID 0x1241 and identifies as "HOLTEK On Line Grip".
6 *
7 * Copyright (c) 2011 Anssi Hannula <anssi.hannula@iki.fi>
8 */
9
10/*
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26#include <linux/hid.h>
27#include <linux/input.h>
Paul Gortmaker8f86a2c2011-07-03 13:39:48 -040028#include <linux/module.h>
Anssi Hannulad946e652011-06-27 00:07:31 +030029#include <linux/slab.h>
30#include <linux/usb.h>
31
32#include "hid-ids.h"
33
34#ifdef CONFIG_HOLTEK_FF
35#include "usbhid/usbhid.h"
36
37MODULE_LICENSE("GPL");
38MODULE_AUTHOR("Anssi Hannula <anssi.hannula@iki.fi>");
39MODULE_DESCRIPTION("Force feedback support for Holtek On Line Grip based devices");
40
41/*
42 * These commands and parameters are currently known:
43 *
44 * byte 0: command id:
45 * 01 set effect parameters
46 * 02 play specified effect
47 * 03 stop specified effect
48 * 04 stop all effects
49 * 06 stop all effects
50 * (the difference between 04 and 06 isn't known; win driver
51 * sends 06,04 on application init, and 06 otherwise)
52 *
53 * Commands 01 and 02 need to be sent as pairs, i.e. you need to send 01
54 * before each 02.
55 *
56 * The rest of the bytes are parameters. Command 01 takes all of them, and
57 * commands 02,03 take only the effect id.
58 *
59 * byte 1:
60 * bits 0-3: effect id:
61 * 1: very strong rumble
62 * 2: periodic rumble, short intervals
63 * 3: very strong rumble
64 * 4: periodic rumble, long intervals
65 * 5: weak periodic rumble, long intervals
66 * 6: weak periodic rumble, short intervals
67 * 7: periodic rumble, short intervals
68 * 8: strong periodic rumble, short intervals
69 * 9: very strong rumble
70 * a: causes an error
71 * b: very strong periodic rumble, very short intervals
72 * c-f: nothing
73 * bit 6: right (weak) motor enabled
74 * bit 7: left (strong) motor enabled
75 *
76 * bytes 2-3: time in milliseconds, big-endian
77 * bytes 5-6: unknown (win driver seems to use at least 10e0 with effect 1
78 * and 0014 with effect 6)
79 * byte 7:
80 * bits 0-3: effect magnitude
81 */
82
83#define HOLTEKFF_MSG_LENGTH 7
84
85static const u8 start_effect_1[] = { 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00 };
86static const u8 stop_all4[] = { 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
87static const u8 stop_all6[] = { 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
88
89struct holtekff_device {
90 struct hid_field *field;
91};
92
93static void holtekff_send(struct holtekff_device *holtekff,
94 struct hid_device *hid,
95 const u8 data[HOLTEKFF_MSG_LENGTH])
96{
97 int i;
98
99 for (i = 0; i < HOLTEKFF_MSG_LENGTH; i++) {
100 holtekff->field->value[i] = data[i];
101 }
102
Andy Shevchenkoe2e78e72012-09-05 15:00:43 +0300103 dbg_hid("sending %*ph\n", 7, data);
Anssi Hannulad946e652011-06-27 00:07:31 +0300104
105 usbhid_submit_report(hid, holtekff->field->report, USB_DIR_OUT);
106}
107
108static int holtekff_play(struct input_dev *dev, void *data,
109 struct ff_effect *effect)
110{
111 struct hid_device *hid = input_get_drvdata(dev);
112 struct holtekff_device *holtekff = data;
113 int left, right;
114 /* effect type 1, length 65535 msec */
115 u8 buf[HOLTEKFF_MSG_LENGTH] =
116 { 0x01, 0x01, 0xff, 0xff, 0x10, 0xe0, 0x00 };
117
118 left = effect->u.rumble.strong_magnitude;
119 right = effect->u.rumble.weak_magnitude;
120 dbg_hid("called with 0x%04x 0x%04x\n", left, right);
121
122 if (!left && !right) {
123 holtekff_send(holtekff, hid, stop_all6);
124 return 0;
125 }
126
127 if (left)
128 buf[1] |= 0x80;
129 if (right)
130 buf[1] |= 0x40;
131
132 /* The device takes a single magnitude, so we just sum them up. */
133 buf[6] = min(0xf, (left >> 12) + (right >> 12));
134
135 holtekff_send(holtekff, hid, buf);
136 holtekff_send(holtekff, hid, start_effect_1);
137
138 return 0;
139}
140
141static int holtekff_init(struct hid_device *hid)
142{
143 struct holtekff_device *holtekff;
144 struct hid_report *report;
145 struct hid_input *hidinput = list_entry(hid->inputs.next,
146 struct hid_input, list);
147 struct list_head *report_list =
148 &hid->report_enum[HID_OUTPUT_REPORT].report_list;
149 struct input_dev *dev = hidinput->input;
150 int error;
151
152 if (list_empty(report_list)) {
153 hid_err(hid, "no output report found\n");
154 return -ENODEV;
155 }
156
157 report = list_entry(report_list->next, struct hid_report, list);
158
159 if (report->maxfield < 1 || report->field[0]->report_count != 7) {
160 hid_err(hid, "unexpected output report layout\n");
161 return -ENODEV;
162 }
163
164 holtekff = kzalloc(sizeof(*holtekff), GFP_KERNEL);
165 if (!holtekff)
166 return -ENOMEM;
167
168 set_bit(FF_RUMBLE, dev->ffbit);
169
170 holtekff->field = report->field[0];
171
172 /* initialize the same way as win driver does */
173 holtekff_send(holtekff, hid, stop_all4);
174 holtekff_send(holtekff, hid, stop_all6);
175
176 error = input_ff_create_memless(dev, holtekff, holtekff_play);
177 if (error) {
178 kfree(holtekff);
179 return error;
180 }
181
182 hid_info(hid, "Force feedback for Holtek On Line Grip based devices by Anssi Hannula <anssi.hannula@iki.fi>\n");
183
184 return 0;
185}
186#else
187static inline int holtekff_init(struct hid_device *hid)
188{
189 return 0;
190}
191#endif
192
193static int holtek_probe(struct hid_device *hdev, const struct hid_device_id *id)
194{
195 int ret;
196
197 ret = hid_parse(hdev);
198 if (ret) {
199 hid_err(hdev, "parse failed\n");
200 goto err;
201 }
202
203 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
204 if (ret) {
205 hid_err(hdev, "hw start failed\n");
206 goto err;
207 }
208
209 holtekff_init(hdev);
210
211 return 0;
212err:
213 return ret;
214}
215
216static const struct hid_device_id holtek_devices[] = {
217 { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK, USB_DEVICE_ID_HOLTEK_ON_LINE_GRIP) },
218 { }
219};
220MODULE_DEVICE_TABLE(hid, holtek_devices);
221
222static struct hid_driver holtek_driver = {
223 .name = "holtek",
224 .id_table = holtek_devices,
225 .probe = holtek_probe,
226};
227
228static int __init holtek_init(void)
229{
230 return hid_register_driver(&holtek_driver);
231}
232
233static void __exit holtek_exit(void)
234{
235 hid_unregister_driver(&holtek_driver);
236}
237
238module_init(holtek_init);
239module_exit(holtek_exit);
240