]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - drivers/hid/hid-lg3ff.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Force feedback support for Logitech Flight System G940
5 * Copyright (c) 2009 Gary Stein <LordCnidarian@gmail.com>
12 #include <linux/input.h>
13 #include <linux/hid.h>
18 * G940 Theory of Operation (from experimentation)
20 * There are 63 fields (only 3 of them currently used)
21 * 0 - seems to be command field
22 * 1 - 30 deal with the x axis
23 * 31 -60 deal with the y axis
25 * Field 1 is x axis constant force
26 * Field 31 is y axis constant force
28 * other interesting fields 1,2,3,4 on x axis
29 * (same for 31,32,33,34 on y axis)
31 * 0 0 127 127 makes the joystick autocenter hard
33 * 127 0 127 127 makes the joystick loose on the right,
34 * but stops all movemnt left
36 * -127 0 -127 -127 makes the joystick loose on the left,
37 * but stops all movement right
39 * 0 0 -127 -127 makes the joystick rattle very hard
41 * I'm sure these are effects that I don't know enough about them
45 struct hid_report
*report
;
48 static int hid_lg3ff_play(struct input_dev
*dev
, void *data
,
49 struct ff_effect
*effect
)
51 struct hid_device
*hid
= input_get_drvdata(dev
);
52 struct list_head
*report_list
= &hid
->report_enum
[HID_OUTPUT_REPORT
].report_list
;
53 struct hid_report
*report
= list_entry(report_list
->next
, struct hid_report
, list
);
57 * Available values in the field should always be 63, but we only use up to
58 * 35. Instead, clear the entire area, however big it is.
60 memset(report
->field
[0]->value
, 0,
61 sizeof(__s32
) * report
->field
[0]->report_count
);
63 switch (effect
->type
) {
66 * Already clamped in ff_memless
67 * 0 is center (different then other logitech)
69 x
= effect
->u
.ramp
.start_level
;
70 y
= effect
->u
.ramp
.end_level
;
72 /* send command byte */
73 report
->field
[0]->value
[0] = 0x51;
76 * Sign backwards from other Force3d pro
77 * which get recast here in two's complement 8 bits
79 report
->field
[0]->value
[1] = (unsigned char)(-x
);
80 report
->field
[0]->value
[31] = (unsigned char)(-y
);
82 hid_hw_request(hid
, report
, HID_REQ_SET_REPORT
);
87 static void hid_lg3ff_set_autocenter(struct input_dev
*dev
, u16 magnitude
)
89 struct hid_device
*hid
= input_get_drvdata(dev
);
90 struct list_head
*report_list
= &hid
->report_enum
[HID_OUTPUT_REPORT
].report_list
;
91 struct hid_report
*report
= list_entry(report_list
->next
, struct hid_report
, list
);
94 * Auto Centering probed from device
95 * NOTE: deadman's switch on G940 must be covered
98 report
->field
[0]->value
[0] = 0x51;
99 report
->field
[0]->value
[1] = 0x00;
100 report
->field
[0]->value
[2] = 0x00;
101 report
->field
[0]->value
[3] = 0x7F;
102 report
->field
[0]->value
[4] = 0x7F;
103 report
->field
[0]->value
[31] = 0x00;
104 report
->field
[0]->value
[32] = 0x00;
105 report
->field
[0]->value
[33] = 0x7F;
106 report
->field
[0]->value
[34] = 0x7F;
108 hid_hw_request(hid
, report
, HID_REQ_SET_REPORT
);
112 static const signed short ff3_joystick_ac
[] = {
118 int lg3ff_init(struct hid_device
*hid
)
120 struct hid_input
*hidinput
;
121 struct input_dev
*dev
;
122 const signed short *ff_bits
= ff3_joystick_ac
;
126 if (list_empty(&hid
->inputs
)) {
127 hid_err(hid
, "no inputs found\n");
130 hidinput
= list_entry(hid
->inputs
.next
, struct hid_input
, list
);
131 dev
= hidinput
->input
;
133 /* Check that the report looks ok */
134 if (!hid_validate_values(hid
, HID_OUTPUT_REPORT
, 0, 0, 35))
137 /* Assume single fixed device G940 */
138 for (i
= 0; ff_bits
[i
] >= 0; i
++)
139 set_bit(ff_bits
[i
], dev
->ffbit
);
141 error
= input_ff_create_memless(dev
, NULL
, hid_lg3ff_play
);
145 if (test_bit(FF_AUTOCENTER
, dev
->ffbit
))
146 dev
->ff
->set_autocenter
= hid_lg3ff_set_autocenter
;
148 hid_info(hid
, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n");