aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/joystick/iforce/iforce-serio.c
blob: 11f51905cba78c055842b657e448b95518e40ee6 (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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/*
 * $Id: iforce-serio.c,v 1.4 2002/01/28 22:45:00 jdeneux Exp $
 *
 *  Copyright (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz>
 *  Copyright (c) 2001 Johann Deneux <deneux@ifrance.com>
 *
 *  USB/RS232 I-Force joysticks and wheels.
 */

/*
 * 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
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include "iforce.h"

void iforce_serial_xmit(struct iforce *iforce)
{
	unsigned char cs;
	int i;
	unsigned long flags;

	if (test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
		set_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags);
		return;
	}

	spin_lock_irqsave(&iforce->xmit_lock, flags);

again:
	if (iforce->xmit.head == iforce->xmit.tail) {
		clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
		spin_unlock_irqrestore(&iforce->xmit_lock, flags);
		return;
	}

	cs = 0x2b;

	serio_write(iforce->serio, 0x2b);

	serio_write(iforce->serio, iforce->xmit.buf[iforce->xmit.tail]);
	cs ^= iforce->xmit.buf[iforce->xmit.tail];
	XMIT_INC(iforce->xmit.tail, 1);

	for (i=iforce->xmit.buf[iforce->xmit.tail]; i >= 0; --i) {
		serio_write(iforce->serio, iforce->xmit.buf[iforce->xmit.tail]);
		cs ^= iforce->xmit.buf[iforce->xmit.tail];
		XMIT_INC(iforce->xmit.tail, 1);
	}

	serio_write(iforce->serio, cs);

	if (test_and_clear_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags))
		goto again;

	clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);

	spin_unlock_irqrestore(&iforce->xmit_lock, flags);
}

static void iforce_serio_write_wakeup(struct serio *serio)
{
	struct iforce *iforce = serio_get_drvdata(serio);

	iforce_serial_xmit(iforce);
}

static irqreturn_t iforce_serio_irq(struct serio *serio,
		unsigned char data, unsigned int flags, struct pt_regs *regs)
{
	struct iforce *iforce = serio_get_drvdata(serio);

	if (!iforce->pkt) {
		if (data == 0x2b)
			iforce->pkt = 1;
		goto out;
	}

	if (!iforce->id) {
		if (data > 3 && data != 0xff)
			iforce->pkt = 0;
		else
			iforce->id = data;
		goto out;
	}

	if (!iforce->len) {
		if (data > IFORCE_MAX_LENGTH) {
			iforce->pkt = 0;
			iforce->id = 0;
		} else {
			iforce->len = data;
		}
		goto out;
	}

	if (iforce->idx < iforce->len) {
		iforce->csum += iforce->data[iforce->idx++] = data;
		goto out;
	}

	if (iforce->idx == iforce->len) {
		iforce_process_packet(iforce, (iforce->id << 8) | iforce->idx, iforce->data, regs);
		iforce->pkt = 0;
		iforce->id  = 0;
		iforce->len = 0;
		iforce->idx = 0;
		iforce->csum = 0;
	}
out:
	return IRQ_HANDLED;
}

static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv)
{
	struct iforce *iforce;
	int err;

	if (!(iforce = kmalloc(sizeof(struct iforce), GFP_KERNEL)))
		return -ENOMEM;

	memset(iforce, 0, sizeof(struct iforce));

	iforce->bus = IFORCE_232;
	iforce->serio = serio;

	serio_set_drvdata(serio, iforce);

	err = serio_open(serio, drv);
	if (err) {
		serio_set_drvdata(serio, NULL);
		kfree(iforce);
		return err;
	}

	if (iforce_init_device(iforce)) {
		serio_close(serio);
		serio_set_drvdata(serio, NULL);
		kfree(iforce);
		return -ENODEV;
	}

	return 0;
}

static void iforce_serio_disconnect(struct serio *serio)
{
	struct iforce *iforce = serio_get_drvdata(serio);

	input_unregister_device(&iforce->dev);
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	kfree(iforce);
}

static struct serio_device_id iforce_serio_ids[] = {
	{
		.type	= SERIO_RS232,
		.proto	= SERIO_IFORCE,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,
	},
	{ 0 }
};

MODULE_DEVICE_TABLE(serio, iforce_serio_ids);

struct serio_driver iforce_serio_drv = {
	.driver		= {
		.name	= "iforce",
	},
	.description	= "RS232 I-Force joysticks and wheels driver",
	.id_table	= iforce_serio_ids,
	.write_wakeup	= iforce_serio_write_wakeup,
	.interrupt	= iforce_serio_irq,
	.connect	= iforce_serio_connect,
	.disconnect	= iforce_serio_disconnect,
};