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32c88cbc SW |
1 | /* |
2 | * Force feedback support for Logitech Speed Force Wireless | |
3 | * | |
4 | * http://wiibrew.org/wiki/Logitech_USB_steering_wheel | |
5 | * | |
6 | * Copyright (c) 2010 Simon Wood <simon@mungewell.org> | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | ||
26 | #include <linux/input.h> | |
27 | #include <linux/usb.h> | |
28 | #include <linux/hid.h> | |
29 | ||
30 | #include "usbhid/usbhid.h" | |
31 | #include "hid-lg.h" | |
32 | ||
33 | struct lg4ff_device { | |
34 | struct hid_report *report; | |
35 | }; | |
36 | ||
37 | static const signed short ff4_wheel_ac[] = { | |
38 | FF_CONSTANT, | |
39 | FF_AUTOCENTER, | |
40 | -1 | |
41 | }; | |
42 | ||
43 | static int hid_lg4ff_play(struct input_dev *dev, void *data, | |
44 | struct ff_effect *effect) | |
45 | { | |
46 | struct hid_device *hid = input_get_drvdata(dev); | |
47 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
48 | struct hid_report *report = list_entry(report_list->next, struct hid_report, list); | |
49 | int x; | |
50 | ||
51 | #define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff | |
52 | ||
53 | switch (effect->type) { | |
54 | case FF_CONSTANT: | |
55 | x = effect->u.ramp.start_level + 0x80; /* 0x80 is no force */ | |
56 | CLAMP(x); | |
57 | report->field[0]->value[0] = 0x11; /* Slot 1 */ | |
58 | report->field[0]->value[1] = 0x10; | |
59 | report->field[0]->value[2] = x; | |
60 | report->field[0]->value[3] = 0x00; | |
61 | report->field[0]->value[4] = 0x00; | |
62 | report->field[0]->value[5] = 0x08; | |
63 | report->field[0]->value[6] = 0x00; | |
64 | dbg_hid("Autocenter, x=0x%02X\n", x); | |
65 | ||
66 | usbhid_submit_report(hid, report, USB_DIR_OUT); | |
67 | break; | |
68 | } | |
69 | return 0; | |
70 | } | |
71 | ||
72 | static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude) | |
73 | { | |
74 | struct hid_device *hid = input_get_drvdata(dev); | |
75 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
76 | struct hid_report *report = list_entry(report_list->next, struct hid_report, list); | |
77 | __s32 *value = report->field[0]->value; | |
78 | ||
79 | *value++ = 0xfe; | |
80 | *value++ = 0x0d; | |
81 | *value++ = 0x07; | |
82 | *value++ = 0x07; | |
83 | *value++ = (magnitude >> 8) & 0xff; | |
84 | *value++ = 0x00; | |
85 | *value = 0x00; | |
86 | ||
87 | usbhid_submit_report(hid, report, USB_DIR_OUT); | |
88 | } | |
89 | ||
90 | ||
91 | int lg4ff_init(struct hid_device *hid) | |
92 | { | |
93 | struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list); | |
94 | struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list; | |
95 | struct input_dev *dev = hidinput->input; | |
96 | struct hid_report *report; | |
97 | struct hid_field *field; | |
98 | const signed short *ff_bits = ff4_wheel_ac; | |
99 | int error; | |
100 | int i; | |
101 | ||
102 | /* Find the report to use */ | |
103 | if (list_empty(report_list)) { | |
4291ee30 | 104 | hid_err(hid, "No output report found\n"); |
32c88cbc SW |
105 | return -1; |
106 | } | |
107 | ||
108 | /* Check that the report looks ok */ | |
109 | report = list_entry(report_list->next, struct hid_report, list); | |
110 | if (!report) { | |
4291ee30 | 111 | hid_err(hid, "NULL output report\n"); |
32c88cbc SW |
112 | return -1; |
113 | } | |
114 | ||
115 | field = report->field[0]; | |
116 | if (!field) { | |
4291ee30 | 117 | hid_err(hid, "NULL field\n"); |
32c88cbc SW |
118 | return -1; |
119 | } | |
120 | ||
121 | for (i = 0; ff_bits[i] >= 0; i++) | |
122 | set_bit(ff_bits[i], dev->ffbit); | |
123 | ||
124 | error = input_ff_create_memless(dev, NULL, hid_lg4ff_play); | |
125 | ||
126 | if (error) | |
127 | return error; | |
128 | ||
129 | if (test_bit(FF_AUTOCENTER, dev->ffbit)) | |
130 | dev->ff->set_autocenter = hid_lg4ff_set_autocenter; | |
131 | ||
4291ee30 | 132 | hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n"); |
32c88cbc SW |
133 | return 0; |
134 | } | |
135 |