1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz>
4 * Copyright (c) 2001, 2007 Johann Deneux <johann.deneux@gmail.com>
6 * USB/RS232 I-Force joysticks and wheels.
12 #include <linux/serio.h>
19 int idx, pkt, len, id;
22 u8 cmd_response[IFORCE_MAX_LENGTH];
24 u8 data_in[IFORCE_MAX_LENGTH];
27 static void iforce_serio_xmit(struct iforce *iforce)
29 struct iforce_serio *iforce_serio = container_of(iforce,
36 if (test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
37 set_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags);
41 spin_lock_irqsave(&iforce->xmit_lock, flags);
44 if (iforce->xmit.head == iforce->xmit.tail) {
45 clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
46 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
52 serio_write(iforce_serio->serio, 0x2b);
54 serio_write(iforce_serio->serio, iforce->xmit.buf[iforce->xmit.tail]);
55 cs ^= iforce->xmit.buf[iforce->xmit.tail];
56 XMIT_INC(iforce->xmit.tail, 1);
58 for (i=iforce->xmit.buf[iforce->xmit.tail]; i >= 0; --i) {
59 serio_write(iforce_serio->serio,
60 iforce->xmit.buf[iforce->xmit.tail]);
61 cs ^= iforce->xmit.buf[iforce->xmit.tail];
62 XMIT_INC(iforce->xmit.tail, 1);
65 serio_write(iforce_serio->serio, cs);
67 if (test_and_clear_bit(IFORCE_XMIT_AGAIN, iforce->xmit_flags))
70 clear_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags);
72 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
75 static int iforce_serio_get_id(struct iforce *iforce, u8 id,
76 u8 *response_data, size_t *response_len)
78 struct iforce_serio *iforce_serio = container_of(iforce,
82 iforce_serio->expect_packet = HI(FF_CMD_QUERY);
83 iforce_serio->cmd_response_len = 0;
85 iforce_send_packet(iforce, FF_CMD_QUERY, &id);
87 wait_event_interruptible_timeout(iforce->wait,
88 !iforce_serio->expect_packet, HZ);
90 if (iforce_serio->expect_packet) {
91 iforce_serio->expect_packet = 0;
95 if (iforce_serio->cmd_response[0] != id)
98 memcpy(response_data, iforce_serio->cmd_response,
99 iforce_serio->cmd_response_len);
100 *response_len = iforce_serio->cmd_response_len;
105 static int iforce_serio_start_io(struct iforce *iforce)
107 /* No special handling required */
111 static void iforce_serio_stop_io(struct iforce *iforce)
113 //TODO: Wait for the last packets to be sent
116 static const struct iforce_xport_ops iforce_serio_xport_ops = {
117 .xmit = iforce_serio_xmit,
118 .get_id = iforce_serio_get_id,
119 .start_io = iforce_serio_start_io,
120 .stop_io = iforce_serio_stop_io,
123 static void iforce_serio_write_wakeup(struct serio *serio)
125 struct iforce *iforce = serio_get_drvdata(serio);
127 iforce_serio_xmit(iforce);
130 static irqreturn_t iforce_serio_irq(struct serio *serio,
131 unsigned char data, unsigned int flags)
133 struct iforce_serio *iforce_serio = serio_get_drvdata(serio);
134 struct iforce *iforce = &iforce_serio->iforce;
136 if (!iforce_serio->pkt) {
138 iforce_serio->pkt = 1;
142 if (!iforce_serio->id) {
143 if (data > 3 && data != 0xff)
144 iforce_serio->pkt = 0;
146 iforce_serio->id = data;
150 if (!iforce_serio->len) {
151 if (data > IFORCE_MAX_LENGTH) {
152 iforce_serio->pkt = 0;
153 iforce_serio->id = 0;
155 iforce_serio->len = data;
160 if (iforce_serio->idx < iforce_serio->len) {
161 iforce_serio->data_in[iforce_serio->idx++] = data;
162 iforce_serio->csum += data;
166 if (iforce_serio->idx == iforce_serio->len) {
167 /* Handle command completion */
168 if (iforce_serio->expect_packet == iforce_serio->id) {
169 iforce_serio->expect_packet = 0;
170 memcpy(iforce_serio->cmd_response,
171 iforce_serio->data_in, IFORCE_MAX_LENGTH);
172 iforce_serio->cmd_response_len = iforce_serio->len;
174 /* Signal that command is done */
175 wake_up(&iforce->wait);
176 } else if (likely(iforce->type)) {
177 iforce_process_packet(iforce, iforce_serio->id,
178 iforce_serio->data_in,
182 iforce_serio->pkt = 0;
183 iforce_serio->id = 0;
184 iforce_serio->len = 0;
185 iforce_serio->idx = 0;
186 iforce_serio->csum = 0;
192 static int iforce_serio_connect(struct serio *serio, struct serio_driver *drv)
194 struct iforce_serio *iforce_serio;
197 iforce_serio = kzalloc(sizeof(*iforce_serio), GFP_KERNEL);
201 iforce_serio->iforce.xport_ops = &iforce_serio_xport_ops;
203 iforce_serio->serio = serio;
204 serio_set_drvdata(serio, iforce_serio);
206 err = serio_open(serio, drv);
210 err = iforce_init_device(&serio->dev, BUS_RS232, &iforce_serio->iforce);
216 fail2: serio_close(serio);
217 fail1: serio_set_drvdata(serio, NULL);
222 static void iforce_serio_disconnect(struct serio *serio)
224 struct iforce_serio *iforce_serio = serio_get_drvdata(serio);
226 input_unregister_device(iforce_serio->iforce.dev);
228 serio_set_drvdata(serio, NULL);
232 static const struct serio_device_id iforce_serio_ids[] = {
235 .proto = SERIO_IFORCE,
242 MODULE_DEVICE_TABLE(serio, iforce_serio_ids);
244 struct serio_driver iforce_serio_drv = {
248 .description = "RS232 I-Force joysticks and wheels driver",
249 .id_table = iforce_serio_ids,
250 .write_wakeup = iforce_serio_write_wakeup,
251 .interrupt = iforce_serio_irq,
252 .connect = iforce_serio_connect,
253 .disconnect = iforce_serio_disconnect,
256 module_serio_driver(iforce_serio_drv);
258 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>, Johann Deneux <johann.deneux@gmail.com>");
259 MODULE_DESCRIPTION("RS232 I-Force joysticks and wheels driver");
260 MODULE_LICENSE("GPL");