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24#include <linux/input.h>
25#include <linux/hid.h>
26
27#include "hid-lg.h"
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56struct lg3ff_device {
57 struct hid_report *report;
58};
59
60static int hid_lg3ff_play(struct input_dev *dev, void *data,
61 struct ff_effect *effect)
62{
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);
66 int x, y;
67
68
69
70
71
72 memset(report->field[0]->value, 0,
73 sizeof(__s32) * report->field[0]->report_count);
74
75 switch (effect->type) {
76 case FF_CONSTANT:
77
78
79
80
81 x = effect->u.ramp.start_level;
82 y = effect->u.ramp.end_level;
83
84
85 report->field[0]->value[0] = 0x51;
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89
90
91 report->field[0]->value[1] = (unsigned char)(-x);
92 report->field[0]->value[31] = (unsigned char)(-y);
93
94 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
95 break;
96 }
97 return 0;
98}
99static void hid_lg3ff_set_autocenter(struct input_dev *dev, u16 magnitude)
100{
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);
104
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109
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;
119
120 hid_hw_request(hid, report, HID_REQ_SET_REPORT);
121}
122
123
124static const signed short ff3_joystick_ac[] = {
125 FF_CONSTANT,
126 FF_AUTOCENTER,
127 -1
128};
129
130int lg3ff_init(struct hid_device *hid)
131{
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;
135 int error;
136 int i;
137
138
139 if (!hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 35))
140 return -ENODEV;
141
142
143 for (i = 0; ff_bits[i] >= 0; i++)
144 set_bit(ff_bits[i], dev->ffbit);
145
146 error = input_ff_create_memless(dev, NULL, hid_lg3ff_play);
147 if (error)
148 return error;
149
150 if (test_bit(FF_AUTOCENTER, dev->ffbit))
151 dev->ff->set_autocenter = hid_lg3ff_set_autocenter;
152
153 hid_info(hid, "Force feedback for Logitech Flight System G940 by Gary Stein <LordCnidarian@gmail.com>\n");
154 return 0;
155}
156
157