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1da177e4 LT |
1 | /* |
2 | * $Id: iforce-serio.c,v 1.4 2002/01/28 22:45:00 jdeneux Exp $ | |
3 | * | |
4 | * Copyright (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz> | |
5 | * Copyright (c) 2001 Johann Deneux <deneux@ifrance.com> | |
6 | * | |
7 | * USB/RS232 I-Force joysticks and wheels. | |
8 | */ | |
9 | ||
10 | /* | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | * | |
25 | * Should you need to contact me, the author, you can do so either by | |
26 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
27 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
28 | */ | |
29 | ||
30 | #include "iforce.h" | |
31 | ||
32 | void iforce_serial_xmit(struct iforce *iforce) | |
33 | { | |
34 | unsigned char cs; | |
35 | int i; | |
36 | unsigned long flags; | |
37 | ||
38 | if (test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) { | |
39 | set_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags); | |
40 | return; | |
41 | } | |
42 | ||
43 | spin_lock_irqsave(&iforce->xmit_lock, flags); | |
44 | ||
45 | again: | |
46 | if (iforce->xmit.head == iforce->xmit.tail) { | |
47 | clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags); | |
48 | spin_unlock_irqrestore(&iforce->xmit_lock, flags); | |
49 | return; | |
50 | } | |
51 | ||
52 | cs = 0x2b; | |
53 | ||
54 | serio_write(iforce->serio, 0x2b); | |
55 | ||
56 | serio_write(iforce->serio, iforce->xmit.buf[iforce->xmit.tail]); | |
57 | cs ^= iforce->xmit.buf[iforce->xmit.tail]; | |
58 | XMIT_INC(iforce->xmit.tail, 1); | |
59 | ||
60 | for (i=iforce->xmit.buf[iforce->xmit.tail]; i >= 0; --i) { | |
61 | serio_write(iforce->serio, iforce->xmit.buf[iforce->xmit.tail]); | |
62 | cs ^= iforce->xmit.buf[iforce->xmit.tail]; | |
63 | XMIT_INC(iforce->xmit.tail, 1); | |
64 | } | |
65 | ||
66 | serio_write(iforce->serio, cs); | |
67 | ||
68 | if (test_and_clear_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags)) | |
69 | goto again; | |
70 | ||
71 | clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags); | |
72 | ||
73 | spin_unlock_irqrestore(&iforce->xmit_lock, flags); | |
74 | } | |
75 | ||
76 | static void iforce_serio_write_wakeup(struct serio *serio) | |
77 | { | |
78 | struct iforce *iforce = serio_get_drvdata(serio); | |
79 | ||
80 | iforce_serial_xmit(iforce); | |
81 | } | |
82 | ||
83 | static irqreturn_t iforce_serio_irq(struct serio *serio, | |
84 | unsigned char data, unsigned int flags, struct pt_regs *regs) | |
85 | { | |
86 | struct iforce *iforce = serio_get_drvdata(serio); | |
87 | ||
88 | if (!iforce->pkt) { | |
89 | if (data == 0x2b) | |
90 | iforce->pkt = 1; | |
91 | goto out; | |
92 | } | |
93 | ||
94 | if (!iforce->id) { | |
95 | if (data > 3 && data != 0xff) | |
96 | iforce->pkt = 0; | |
97 | else | |
98 | iforce->id = data; | |
99 | goto out; | |
100 | } | |
101 | ||
102 | if (!iforce->len) { | |
103 | if (data > IFORCE_MAX_LENGTH) { | |
104 | iforce->pkt = 0; | |
105 | iforce->id = 0; | |
106 | } else { | |
107 | iforce->len = data; | |
108 | } | |
109 | goto out; | |
110 | } | |
111 | ||
112 | if (iforce->idx < iforce->len) { | |
113 | iforce->csum += iforce->data[iforce->idx++] = data; | |
114 | goto out; | |
115 | } | |
116 | ||
117 | if (iforce->idx == iforce->len) { | |
118 | iforce_process_packet(iforce, (iforce->id << 8) | iforce->idx, iforce->data, regs); | |
119 | iforce->pkt = 0; | |
120 | iforce->id = 0; | |
121 | iforce->len = 0; | |
122 | iforce->idx = 0; | |
123 | iforce->csum = 0; | |
124 | } | |
125 | out: | |
126 | return IRQ_HANDLED; | |
127 | } | |
128 | ||
129 | static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv) | |
130 | { | |
131 | struct iforce *iforce; | |
132 | int err; | |
133 | ||
17dd3f0f DT |
134 | iforce = kzalloc(sizeof(struct iforce), GFP_KERNEL); |
135 | if (!iforce) | |
1da177e4 LT |
136 | return -ENOMEM; |
137 | ||
1da177e4 LT |
138 | iforce->bus = IFORCE_232; |
139 | iforce->serio = serio; | |
140 | ||
141 | serio_set_drvdata(serio, iforce); | |
142 | ||
143 | err = serio_open(serio, drv); | |
144 | if (err) { | |
145 | serio_set_drvdata(serio, NULL); | |
146 | kfree(iforce); | |
147 | return err; | |
148 | } | |
149 | ||
17dd3f0f DT |
150 | err = iforce_init_device(iforce); |
151 | if (err) { | |
1da177e4 LT |
152 | serio_close(serio); |
153 | serio_set_drvdata(serio, NULL); | |
154 | kfree(iforce); | |
155 | return -ENODEV; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static void iforce_serio_disconnect(struct serio *serio) | |
162 | { | |
163 | struct iforce *iforce = serio_get_drvdata(serio); | |
164 | ||
17dd3f0f | 165 | input_unregister_device(iforce->dev); |
1da177e4 LT |
166 | serio_close(serio); |
167 | serio_set_drvdata(serio, NULL); | |
168 | kfree(iforce); | |
169 | } | |
170 | ||
171 | static struct serio_device_id iforce_serio_ids[] = { | |
172 | { | |
173 | .type = SERIO_RS232, | |
174 | .proto = SERIO_IFORCE, | |
175 | .id = SERIO_ANY, | |
176 | .extra = SERIO_ANY, | |
177 | }, | |
178 | { 0 } | |
179 | }; | |
180 | ||
181 | MODULE_DEVICE_TABLE(serio, iforce_serio_ids); | |
182 | ||
183 | struct serio_driver iforce_serio_drv = { | |
184 | .driver = { | |
185 | .name = "iforce", | |
186 | }, | |
187 | .description = "RS232 I-Force joysticks and wheels driver", | |
188 | .id_table = iforce_serio_ids, | |
189 | .write_wakeup = iforce_serio_write_wakeup, | |
190 | .interrupt = iforce_serio_irq, | |
191 | .connect = iforce_serio_connect, | |
192 | .disconnect = iforce_serio_disconnect, | |
193 | }; |