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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/hid/hid-lg3ff.c
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/hid.h>
30 * G940 Theory of Operation (from experimentation)
32 * There are 63 fields (only 3 of them currently used)
33 * 0 - seems to be command field
34 * 1 - 30 deal with the x axis
35 * 31 -60 deal with the y axis
37 * Field 1 is x axis constant force
38 * Field 31 is y axis constant force
40 * other interesting fields 1,2,3,4 on x axis
41 * (same for 31,32,33,34 on y axis)
43 * 0 0 127 127 makes the joystick autocenter hard
45 * 127 0 127 127 makes the joystick loose on the right,
46 * but stops all movemnt left
48 * -127 0 -127 -127 makes the joystick loose on the left,
49 * but stops all movement right
51 * 0 0 -127 -127 makes the joystick rattle very hard
53 * I'm sure these are effects that I don't know enough about them
57 struct hid_report
*report
;
60 static int hid_lg3ff_play(struct input_dev
*dev
, void *data
,
61 struct ff_effect
*effect
)
63 struct hid_device
*hid
= input_get_drvdata(dev
);
64 struct list_head
*report_list
= &hid
->report_enum
[HID_OUTPUT_REPORT
].report_list
;
65 struct hid_report
*report
= list_entry(report_list
->next
, struct hid_report
, list
);
69 * Available values in the field should always be 63, but we only use up to
70 * 35. Instead, clear the entire area, however big it is.
72 memset(report
->field
[0]->value
, 0,
73 sizeof(__s32
) * report
->field
[0]->report_count
);
75 switch (effect
->type
) {
78 * Already clamped in ff_memless
79 * 0 is center (different then other logitech)
81 x
= effect
->u
.ramp
.start_level
;
82 y
= effect
->u
.ramp
.end_level
;
84 /* send command byte */
85 report
->field
[0]->value
[0] = 0x51;
88 * Sign backwards from other Force3d pro
89 * which get recast here in two's complement 8 bits
91 report
->field
[0]->value
[1] = (unsigned char)(-x
);
92 report
->field
[0]->value
[31] = (unsigned char)(-y
);
94 hid_hw_request(hid
, report
, HID_REQ_SET_REPORT
);
99 static void hid_lg3ff_set_autocenter(struct input_dev
*dev
, u16 magnitude
)
101 struct hid_device
*hid
= input_get_drvdata(dev
);
102 struct list_head
*report_list
= &hid
->report_enum
[HID_OUTPUT_REPORT
].report_list
;
103 struct hid_report
*report
= list_entry(report_list
->next
, struct hid_report
, list
);
106 * Auto Centering probed from device
107 * NOTE: deadman's switch on G940 must be covered
108 * for effects to work
110 report
->field
[0]->value
[0] = 0x51;
111 report
->field
[0]->value
[1] = 0x00;
112 report
->field
[0]->value
[2] = 0x00;
113 report
->field
[0]->value
[3] = 0x7F;
114 report
->field
[0]->value
[4] = 0x7F;
115 report
->field
[0]->value
[31] = 0x00;
116 report
->field
[0]->value
[32] = 0x00;
117 report
->field
[0]->value
[33] = 0x7F;
118 report
->field
[0]->value
[34] = 0x7F;
120 hid_hw_request(hid
, report
, HID_REQ_SET_REPORT
);
124 static const signed short ff3_joystick_ac
[] = {
130 int lg3ff_init(struct hid_device
*hid
)
132 struct hid_input
*hidinput
= list_entry(hid
->inputs
.next
, struct hid_input
, list
);
133 struct input_dev
*dev
= hidinput
->input
;
134 const signed short *ff_bits
= ff3_joystick_ac
;
138 /* Check that the report looks ok */
139 if (!hid_validate_values(hid
, HID_OUTPUT_REPORT
, 0, 0, 35))
142 /* Assume single fixed device G940 */
143 for (i
= 0; ff_bits
[i
] >= 0; i
++)
144 set_bit(ff_bits
[i
], dev
->ffbit
);
146 error
= input_ff_create_memless(dev
, NULL
, hid_lg3ff_play
);
150 if (test_bit(FF_AUTOCENTER
, dev
->ffbit
))
151 dev
->ff
->set_autocenter
= hid_lg3ff_set_autocenter
;
153 hid_info(hid
, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n");