2 * Copyright (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz>
3 * Copyright (c) 2001, 2007 Johann Deneux <johann.deneux@gmail.com>
5 * USB/RS232 I-Force joysticks and wheels.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #include <linux/serio.h>
31 int idx, pkt, len, id;
34 u8 cmd_response[IFORCE_MAX_LENGTH];
36 u8 data_in[IFORCE_MAX_LENGTH];
39 static void iforce_serio_xmit(struct iforce *iforce)
41 struct iforce_serio *iforce_serio = container_of(iforce,
48 if (test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
49 set_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags);
53 spin_lock_irqsave(&iforce->xmit_lock, flags);
56 if (iforce->xmit.head == iforce->xmit.tail) {
57 clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
58 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
64 serio_write(iforce_serio->serio, 0x2b);
66 serio_write(iforce_serio->serio, iforce->xmit.buf[iforce->xmit.tail]);
67 cs ^= iforce->xmit.buf[iforce->xmit.tail];
68 XMIT_INC(iforce->xmit.tail, 1);
70 for (i=iforce->xmit.buf[iforce->xmit.tail]; i >= 0; --i) {
71 serio_write(iforce_serio->serio,
72 iforce->xmit.buf[iforce->xmit.tail]);
73 cs ^= iforce->xmit.buf[iforce->xmit.tail];
74 XMIT_INC(iforce->xmit.tail, 1);
77 serio_write(iforce_serio->serio, cs);
79 if (test_and_clear_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags))
82 clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
84 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
87 static int iforce_serio_get_id(struct iforce *iforce, u8 id,
88 u8 *response_data, size_t *response_len)
90 struct iforce_serio *iforce_serio = container_of(iforce,
94 iforce_serio->expect_packet = HI(FF_CMD_QUERY);
95 iforce_serio->cmd_response_len = 0;
97 iforce_send_packet(iforce, FF_CMD_QUERY, &id);
99 wait_event_interruptible_timeout(iforce->wait,
100 !iforce_serio->expect_packet, HZ);
102 if (iforce_serio->expect_packet) {
103 iforce_serio->expect_packet = 0;
107 if (iforce_serio->cmd_response[0] != id)
110 memcpy(response_data, iforce_serio->cmd_response,
111 iforce_serio->cmd_response_len);
112 *response_len = iforce_serio->cmd_response_len;
117 static int iforce_serio_start_io(struct iforce *iforce)
119 /* No special handling required */
123 static void iforce_serio_stop_io(struct iforce *iforce)
125 //TODO: Wait for the last packets to be sent
128 static const struct iforce_xport_ops iforce_serio_xport_ops = {
129 .xmit = iforce_serio_xmit,
130 .get_id = iforce_serio_get_id,
131 .start_io = iforce_serio_start_io,
132 .stop_io = iforce_serio_stop_io,
135 static void iforce_serio_write_wakeup(struct serio *serio)
137 struct iforce *iforce = serio_get_drvdata(serio);
139 iforce_serio_xmit(iforce);
142 static irqreturn_t iforce_serio_irq(struct serio *serio,
143 unsigned char data, unsigned int flags)
145 struct iforce_serio *iforce_serio = serio_get_drvdata(serio);
146 struct iforce *iforce = &iforce_serio->iforce;
148 if (!iforce_serio->pkt) {
150 iforce_serio->pkt = 1;
154 if (!iforce_serio->id) {
155 if (data > 3 && data != 0xff)
156 iforce_serio->pkt = 0;
158 iforce_serio->id = data;
162 if (!iforce_serio->len) {
163 if (data > IFORCE_MAX_LENGTH) {
164 iforce_serio->pkt = 0;
165 iforce_serio->id = 0;
167 iforce_serio->len = data;
172 if (iforce_serio->idx < iforce_serio->len) {
173 iforce_serio->data_in[iforce_serio->idx++] = data;
174 iforce_serio->csum += data;
178 if (iforce_serio->idx == iforce_serio->len) {
179 /* Handle command completion */
180 if (iforce_serio->expect_packet == iforce_serio->id) {
181 iforce_serio->expect_packet = 0;
182 memcpy(iforce_serio->cmd_response,
183 iforce_serio->data_in, IFORCE_MAX_LENGTH);
184 iforce_serio->cmd_response_len = iforce_serio->len;
186 /* Signal that command is done */
187 wake_up(&iforce->wait);
188 } else if (likely(iforce->type)) {
189 iforce_process_packet(iforce, iforce_serio->id,
190 iforce_serio->data_in,
194 iforce_serio->pkt = 0;
195 iforce_serio->id = 0;
196 iforce_serio->len = 0;
197 iforce_serio->idx = 0;
198 iforce_serio->csum = 0;
204 static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv)
206 struct iforce_serio *iforce_serio;
207 struct iforce *iforce;
210 iforce_serio = kzalloc(sizeof(*iforce_serio), GFP_KERNEL);
214 iforce = &iforce_serio->iforce;
216 iforce->xport_ops = &iforce_serio_xport_ops;
218 iforce_serio->serio = serio;
219 serio_set_drvdata(serio, iforce_serio);
221 err = serio_open(serio, drv);
225 err = iforce_init_device(&serio->dev, BUS_RS232, iforce);
231 fail2: serio_close(serio);
232 fail1: serio_set_drvdata(serio, NULL);
237 static void iforce_serio_disconnect(struct serio *serio)
239 struct iforce_serio *iforce_serio = serio_get_drvdata(serio);
241 input_unregister_device(iforce_serio->iforce.dev);
243 serio_set_drvdata(serio, NULL);
247 static const struct serio_device_id iforce_serio_ids[] = {
250 .proto = SERIO_IFORCE,
257 MODULE_DEVICE_TABLE(serio, iforce_serio_ids);
259 struct serio_driver iforce_serio_drv = {
263 .description = "RS232 I-Force joysticks and wheels driver",
264 .id_table = iforce_serio_ids,
265 .write_wakeup = iforce_serio_write_wakeup,
266 .interrupt = iforce_serio_irq,
267 .connect = iforce_serio_connect,
268 .disconnect = iforce_serio_disconnect,
271 module_serio_driver(iforce_serio_drv);
273 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>, Johann Deneux <johann.deneux@gmail.com>");
274 MODULE_DESCRIPTION("RS232 I-Force joysticks and wheels driver");
275 MODULE_LICENSE("GPL");