hwmon: (it87) Add chassis intrusion detection support
[linux-2.6.git] / drivers / hid / hid-lg4ff.c
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)) {
104                 hid_err(hid, "No output report found\n");
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) {
111                 hid_err(hid, "NULL output report\n");
112                 return -1;
113         }
114
115         field = report->field[0];
116         if (!field) {
117                 hid_err(hid, "NULL field\n");
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
132         hid_info(hid, "Force feedback for Logitech Speed Force Wireless by Simon Wood <simon@mungewell.org>\n");
133         return 0;
134 }
135