2 * Force feedback support for Logitech Flight System G940
4 * Copyright (c) 2009 Gary Stein <LordCnidarian@gmail.com>
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.
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.
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
24 #include <linux/input.h>
25 #include <linux/usb.h>
26 #include <linux/hid.h>
28 #include "usbhid/usbhid.h"
32 * G940 Theory of Operation (from experimentation)
34 * There are 63 fields (only 3 of them currently used)
35 * 0 - seems to be command field
36 * 1 - 30 deal with the x axis
37 * 31 -60 deal with the y axis
39 * Field 1 is x axis constant force
40 * Field 31 is y axis constant force
42 * other interesting fields 1,2,3,4 on x axis
43 * (same for 31,32,33,34 on y axis)
45 * 0 0 127 127 makes the joystick autocenter hard
47 * 127 0 127 127 makes the joystick loose on the right,
48 * but stops all movemnt left
50 * -127 0 -127 -127 makes the joystick loose on the left,
51 * but stops all movement right
53 * 0 0 -127 -127 makes the joystick rattle very hard
55 * I'm sure these are effects that I don't know enough about them
59 struct hid_report
*report
;
62 static int hid_lg3ff_play(struct input_dev
*dev
, void *data
,
63 struct ff_effect
*effect
)
65 struct hid_device
*hid
= input_get_drvdata(dev
);
66 struct list_head
*report_list
= &hid
->report_enum
[HID_OUTPUT_REPORT
].report_list
;
67 struct hid_report
*report
= list_entry(report_list
->next
, struct hid_report
, list
);
71 * Maxusage should always be 63 (maximum fields)
72 * likely a better way to ensure this data is clean
74 memset(report
->field
[0]->value
, 0, sizeof(__s32
)*report
->field
[0]->maxusage
);
76 switch (effect
->type
) {
79 * Already clamped in ff_memless
80 * 0 is center (different then other logitech)
82 x
= effect
->u
.ramp
.start_level
;
83 y
= effect
->u
.ramp
.end_level
;
85 /* send command byte */
86 report
->field
[0]->value
[0] = 0x51;
89 * Sign backwards from other Force3d pro
90 * which get recast here in two's complement 8 bits
92 report
->field
[0]->value
[1] = (unsigned char)(-x
);
93 report
->field
[0]->value
[31] = (unsigned char)(-y
);
95 usbhid_submit_report(hid
, report
, USB_DIR_OUT
);
100 static void hid_lg3ff_set_autocenter(struct input_dev
*dev
, u16 magnitude
)
102 struct hid_device
*hid
= input_get_drvdata(dev
);
103 struct list_head
*report_list
= &hid
->report_enum
[HID_OUTPUT_REPORT
].report_list
;
104 struct hid_report
*report
= list_entry(report_list
->next
, struct hid_report
, list
);
107 * Auto Centering probed from device
108 * NOTE: deadman's switch on G940 must be covered
109 * for effects to work
111 report
->field
[0]->value
[0] = 0x51;
112 report
->field
[0]->value
[1] = 0x00;
113 report
->field
[0]->value
[2] = 0x00;
114 report
->field
[0]->value
[3] = 0x7F;
115 report
->field
[0]->value
[4] = 0x7F;
116 report
->field
[0]->value
[31] = 0x00;
117 report
->field
[0]->value
[32] = 0x00;
118 report
->field
[0]->value
[33] = 0x7F;
119 report
->field
[0]->value
[34] = 0x7F;
121 usbhid_submit_report(hid
, report
, USB_DIR_OUT
);
125 static const signed short ff3_joystick_ac
[] = {
131 int lg3ff_init(struct hid_device
*hid
)
133 struct hid_input
*hidinput
= list_entry(hid
->inputs
.next
, struct hid_input
, list
);
134 struct list_head
*report_list
= &hid
->report_enum
[HID_OUTPUT_REPORT
].report_list
;
135 struct input_dev
*dev
= hidinput
->input
;
136 struct hid_report
*report
;
137 struct hid_field
*field
;
138 const signed short *ff_bits
= ff3_joystick_ac
;
142 /* Find the report to use */
143 if (list_empty(report_list
)) {
144 hid_err(hid
, "No output report found\n");
148 /* Check that the report looks ok */
149 report
= list_entry(report_list
->next
, struct hid_report
, list
);
151 hid_err(hid
, "NULL output report\n");
155 field
= report
->field
[0];
157 hid_err(hid
, "NULL field\n");
161 /* Assume single fixed device G940 */
162 for (i
= 0; ff_bits
[i
] >= 0; i
++)
163 set_bit(ff_bits
[i
], dev
->ffbit
);
165 error
= input_ff_create_memless(dev
, NULL
, hid_lg3ff_play
);
169 if (test_bit(FF_AUTOCENTER
, dev
->ffbit
))
170 dev
->ff
->set_autocenter
= hid_lg3ff_set_autocenter
;
172 hid_info(hid
, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n");
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