1 /*
2  * $Id: iforce-packets.c,v 1.16 2002/07/07 10:22:50 jdeneux Exp $
3  *
4  *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
5  *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.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 static struct {
33 	__s32 x;
34 	__s32 y;
35 } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
36 
37 
38 void iforce_dump_packet(char *msg, u16 cmd, unsigned char *data)
39 {
40 	int i;
41 
42 	printk(KERN_DEBUG __FILE__ ": %s cmd = %04x, data = ", msg, cmd);
43 	for (i = 0; i < LO(cmd); i++)
44 		printk("%02x ", data[i]);
45 	printk("\n");
46 }
47 
48 /*
49  * Send a packet of bytes to the device
50  */
51 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
52 {
53 	/* Copy data to buffer */
54 	int n = LO(cmd);
55 	int c;
56 	int empty;
57 	int head, tail;
58 	unsigned long flags;
59 
60 /*
61  * Update head and tail of xmit buffer
62  */
63 	spin_lock_irqsave(&iforce->xmit_lock, flags);
64 
65 	head = iforce->xmit.head;
66 	tail = iforce->xmit.tail;
67 
68 
69 	if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
70 		warn("not enough space in xmit buffer to send new packet");
71 		spin_unlock_irqrestore(&iforce->xmit_lock, flags);
72 		return -1;
73 	}
74 
75 	empty = head == tail;
76 	XMIT_INC(iforce->xmit.head, n+2);
77 
78 /*
79  * Store packet in xmit buffer
80  */
81 	iforce->xmit.buf[head] = HI(cmd);
82 	XMIT_INC(head, 1);
83 	iforce->xmit.buf[head] = LO(cmd);
84 	XMIT_INC(head, 1);
85 
86 	c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
87 	if (n < c) c=n;
88 
89 	memcpy(&iforce->xmit.buf[head],
90 	       data,
91 	       c);
92 	if (n != c) {
93 		memcpy(&iforce->xmit.buf[0],
94 		       data + c,
95 		       n - c);
96 	}
97 	XMIT_INC(head, n);
98 
99 	spin_unlock_irqrestore(&iforce->xmit_lock, flags);
100 /*
101  * If necessary, start the transmission
102  */
103 	switch (iforce->bus) {
104 
105 #ifdef CONFIG_JOYSTICK_IFORCE_232
106 		case IFORCE_232:
107 		if (empty)
108 			iforce_serial_xmit(iforce);
109 		break;
110 #endif
111 #ifdef CONFIG_JOYSTICK_IFORCE_USB
112 		case IFORCE_USB:
113 
114 		if (iforce->usbdev && empty &&
115 			!test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
116 
117 			iforce_usb_xmit(iforce);
118 		}
119 		break;
120 #endif
121 	}
122 	return 0;
123 }
124 
125 /* Start or stop an effect */
126 int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
127 {
128 	unsigned char data[3];
129 
130 	data[0] = LO(id);
131 	data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
132 	data[2] = LO(value);
133 	return iforce_send_packet(iforce, FF_CMD_PLAY, data);
134 }
135 
136 /* Mark an effect that was being updated as ready. That means it can be updated
137  * again */
138 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
139 {
140 	int i;
141 
142 	if (!iforce->dev->ff)
143 		return 0;
144 
145 	for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
146 		if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
147 		    (iforce->core_effects[i].mod1_chunk.start == addr ||
148 		     iforce->core_effects[i].mod2_chunk.start == addr)) {
149 			clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
150 			return 0;
151 		}
152 	}
153 	warn("unused effect %04x updated !!!", addr);
154 	return -1;
155 }
156 
157 void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
158 {
159 	struct input_dev *dev = iforce->dev;
160 	int i;
161 	static int being_used = 0;
162 
163 	if (being_used)
164 		warn("re-entrant call to iforce_process %d", being_used);
165 	being_used++;
166 
167 #ifdef CONFIG_JOYSTICK_IFORCE_232
168 	if (HI(iforce->expect_packet) == HI(cmd)) {
169 		iforce->expect_packet = 0;
170 		iforce->ecmd = cmd;
171 		memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
172 	}
173 #endif
174 	wake_up(&iforce->wait);
175 
176 	if (!iforce->type) {
177 		being_used--;
178 		return;
179 	}
180 
181 	switch (HI(cmd)) {
182 
183 		case 0x01:	/* joystick position data */
184 		case 0x03:	/* wheel position data */
185 			if (HI(cmd) == 1) {
186 				input_report_abs(dev, ABS_X, (__s16) (((__s16)data[1] << 8) | data[0]));
187 				input_report_abs(dev, ABS_Y, (__s16) (((__s16)data[3] << 8) | data[2]));
188 				input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
189 				if (LO(cmd) >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
190 					input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
191 			} else {
192 				input_report_abs(dev, ABS_WHEEL, (__s16) (((__s16)data[1] << 8) | data[0]));
193 				input_report_abs(dev, ABS_GAS,   255 - data[2]);
194 				input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
195 			}
196 
197 			input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
198 			input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
199 
200 			for (i = 0; iforce->type->btn[i] >= 0; i++)
201 				input_report_key(dev, iforce->type->btn[i], data[(i >> 3) + 5] & (1 << (i & 7)));
202 
203 			/* If there are untouched bits left, interpret them as the second hat */
204 			if (i <= 8) {
205 				int btns = data[6];
206 				if (test_bit(ABS_HAT1X, dev->absbit)) {
207 					if (btns & 8) input_report_abs(dev, ABS_HAT1X, -1);
208 					else if (btns & 2) input_report_abs(dev, ABS_HAT1X, 1);
209 					else input_report_abs(dev, ABS_HAT1X, 0);
210 				}
211 				if (test_bit(ABS_HAT1Y, dev->absbit)) {
212 					if (btns & 1) input_report_abs(dev, ABS_HAT1Y, -1);
213 					else if (btns & 4) input_report_abs(dev, ABS_HAT1Y, 1);
214 					else input_report_abs(dev, ABS_HAT1Y, 0);
215 				}
216 			}
217 
218 			input_sync(dev);
219 
220 			break;
221 
222 		case 0x02:	/* status report */
223 			input_report_key(dev, BTN_DEAD, data[0] & 0x02);
224 			input_sync(dev);
225 
226 			/* Check if an effect was just started or stopped */
227 			i = data[1] & 0x7f;
228 			if (data[1] & 0x80) {
229 				if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
230 					/* Report play event */
231 					input_report_ff_status(dev, i, FF_STATUS_PLAYING);
232 				}
233 			} else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
234 				/* Report stop event */
235 				input_report_ff_status(dev, i, FF_STATUS_STOPPED);
236 			}
237 			if (LO(cmd) > 3) {
238 				int j;
239 				for (j = 3; j < LO(cmd); j += 2)
240 					mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
241 			}
242 			break;
243 	}
244 	being_used--;
245 }
246 
247 int iforce_get_id_packet(struct iforce *iforce, char *packet)
248 {
249 	switch (iforce->bus) {
250 
251 	case IFORCE_USB: {
252 #ifdef CONFIG_JOYSTICK_IFORCE_USB
253 		int status;
254 
255 		iforce->cr.bRequest = packet[0];
256 		iforce->ctrl->dev = iforce->usbdev;
257 
258 		status = usb_submit_urb(iforce->ctrl, GFP_ATOMIC);
259 		if (status) {
260 			err("usb_submit_urb failed %d", status);
261 			return -1;
262 		}
263 
264 		wait_event_interruptible_timeout(iforce->wait,
265 			iforce->ctrl->status != -EINPROGRESS, HZ);
266 
267 		if (iforce->ctrl->status) {
268 			dbg("iforce->ctrl->status = %d", iforce->ctrl->status);
269 			usb_unlink_urb(iforce->ctrl);
270 			return -1;
271 		}
272 #else
273 		dbg("iforce_get_id_packet: iforce->bus = USB!");
274 #endif
275 		}
276 		break;
277 
278 	case IFORCE_232:
279 
280 #ifdef CONFIG_JOYSTICK_IFORCE_232
281 		iforce->expect_packet = FF_CMD_QUERY;
282 		iforce_send_packet(iforce, FF_CMD_QUERY, packet);
283 
284 		wait_event_interruptible_timeout(iforce->wait,
285 			!iforce->expect_packet, HZ);
286 
287 		if (iforce->expect_packet) {
288 			iforce->expect_packet = 0;
289 			return -1;
290 		}
291 #else
292 		err("iforce_get_id_packet: iforce->bus = SERIO!");
293 #endif
294 		break;
295 
296 	default:
297 		err("iforce_get_id_packet: iforce->bus = %d", iforce->bus);
298 		break;
299 	}
300 
301 	return -(iforce->edata[0] != packet[0]);
302 }
303 
304