summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-lg4ff.c
blob: 7eef5a2ce9487c5d0d291a368c15b9a54b230a14 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 *  Force feedback support for Logitech Speed Force Wireless
 *
 *  http://wiibrew.org/wiki/Logitech_USB_steering_wheel
 *
 *  Copyright (c) 2010 Simon Wood <simon@mungewell.org>
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */


#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>

#include "usbhid/usbhid.h"
#include "hid-lg.h"

struct lg4ff_device {
	struct hid_report *report;
};

static const signed short ff4_wheel_ac[] = {
	FF_CONSTANT,
	FF_AUTOCENTER,
	-1
};

static int hid_lg4ff_play(struct input_dev *dev, void *data,
			 struct ff_effect *effect)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	int x;

#define CLAMP(x) if (x < 0) x = 0; if (x > 0xff) x = 0xff

	switch (effect->type) {
	case FF_CONSTANT:
		x = effect->u.ramp.start_level + 0x80;	/* 0x80 is no force */
		CLAMP(x);
		report->field[0]->value[0] = 0x11;	/* Slot 1 */
		report->field[0]->value[1] = 0x10;
		report->field[0]->value[2] = x;
		report->field[0]->value[3] = 0x00;
		report->field[0]->value[4] = 0x00;
		report->field[0]->value[5] = 0x08;
		report->field[0]->value[6] = 0x00;
		dbg_hid("Autocenter, x=0x%02X\n", x);

		usbhid_submit_report(hid, report, USB_DIR_OUT);
		break;
	}
	return 0;
}

static void hid_lg4ff_set_autocenter(struct input_dev *dev, u16 magnitude)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
	__s32 *value = report->field[0]->value;

	*value++ = 0xfe;
	*value++ = 0x0d;
	*value++ = 0x07;
	*value++ = 0x07;
	*value++ = (magnitude >> 8) & 0xff;
	*value++ = 0x00;
	*value = 0x00;

	usbhid_submit_report(hid, report, USB_DIR_OUT);
}


int lg4ff_init(struct hid_device *hid)
{
	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	struct input_dev *dev = hidinput->input;
	struct hid_report *report;
	struct hid_field *field;
	const signed short *ff_bits = ff4_wheel_ac;
	int error;
	int i;

	/* Find the report to use */
	if (list_empty(report_list)) {
		err_hid("No output report found");
		return -1;
	}

	/* Check that the report looks ok */
	report = list_entry(report_list->next, struct hid_report, list);
	if (!report) {
		err_hid("NULL output report");
		return -1;
	}

	field = report->field[0];
	if (!field) {
		err_hid("NULL field");
		return -1;
	}

	for (i = 0; ff_bits[i] >= 0; i++)
		set_bit(ff_bits[i], dev->ffbit);

	error = input_ff_create_memless(dev, NULL, hid_lg4ff_play);

	if (error)
		return error;

	if (test_bit(FF_AUTOCENTER, dev->ffbit))
		dev->ff->set_autocenter = hid_lg4ff_set_autocenter;

	dev_info(&hid->dev, "Force feedback for Logitech Speed Force Wireless by "
			"Simon Wood <simon@mungewell.org>\n");
	return 0;
}

OpenPOWER on IntegriCloud