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 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 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 "iforce.c: %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 	if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
69 		printk(KERN_WARNING "iforce.c: not enough space in xmit buffer to send new packet\n");
70 		spin_unlock_irqrestore(&iforce->xmit_lock, flags);
71 		return -1;
72 	}
73 
74 	empty = head == tail;
75 	XMIT_INC(iforce->xmit.head, n+2);
76 
77 /*
78  * Store packet in xmit buffer
79  */
80 	iforce->xmit.buf[head] = HI(cmd);
81 	XMIT_INC(head, 1);
82 	iforce->xmit.buf[head] = LO(cmd);
83 	XMIT_INC(head, 1);
84 
85 	c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
86 	if (n < c) c=n;
87 
88 	memcpy(&iforce->xmit.buf[head],
89 	       data,
90 	       c);
91 	if (n != c) {
92 		memcpy(&iforce->xmit.buf[0],
93 		       data + c,
94 		       n - c);
95 	}
96 	XMIT_INC(head, n);
97 
98 	spin_unlock_irqrestore(&iforce->xmit_lock, flags);
99 /*
100  * If necessary, start the transmission
101  */
102 	switch (iforce->bus) {
103 
104 #ifdef CONFIG_JOYSTICK_IFORCE_232
105 		case IFORCE_232:
106 		if (empty)
107 			iforce_serial_xmit(iforce);
108 		break;
109 #endif
110 #ifdef CONFIG_JOYSTICK_IFORCE_USB
111 		case IFORCE_USB:
112 
113 		if (iforce->usbdev && empty &&
114 			!test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
115 
116 			iforce_usb_xmit(iforce);
117 		}
118 		break;
119 #endif
120 	}
121 	return 0;
122 }
123 
124 /* Start or stop an effect */
125 int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
126 {
127 	unsigned char data[3];
128 
129 printk(KERN_DEBUG "iforce-packets.c: control_playback %d %d\n", id, value);
130 
131 	data[0] = LO(id);
132 	data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
133 	data[2] = LO(value);
134 	return iforce_send_packet(iforce, FF_CMD_PLAY, data);
135 }
136 
137 /* Mark an effect that was being updated as ready. That means it can be updated
138  * again */
139 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
140 {
141 	int i;
142 	for (i=0; i<iforce->dev.ff_effects_max; ++i) {
143 		if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
144 		    (iforce->core_effects[i].mod1_chunk.start == addr ||
145 		     iforce->core_effects[i].mod2_chunk.start == addr)) {
146 			clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
147 			return 0;
148 		}
149 	}
150 	printk(KERN_WARNING "iforce-packets.c: unused effect %04x updated !!!\n", addr);
151 	return -1;
152 }
153 
154 void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data, struct pt_regs *regs)
155 {
156 	struct input_dev *dev = &iforce->dev;
157 	int i;
158 	static int being_used = 0;
159 
160 	if (being_used)
161 		printk(KERN_WARNING "iforce-packets.c: re-entrant call to iforce_process %d\n", being_used);
162 	being_used++;
163 
164 #ifdef CONFIG_JOYSTICK_IFORCE_232
165 	if (HI(iforce->expect_packet) == HI(cmd)) {
166 		iforce->expect_packet = 0;
167 		iforce->ecmd = cmd;
168 		memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
169 		wake_up(&iforce->wait);
170 	}
171 #endif
172 
173 	if (!iforce->type) {
174 		being_used--;
175 		return;
176 	}
177 
178 	switch (HI(cmd)) {
179 
180 		case 0x01:	/* joystick position data */
181 		case 0x03:	/* wheel position data */
182 
183 			input_regs(dev, regs);
184 
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_regs(dev, regs);
224 			input_report_key(dev, BTN_DEAD, data[0] & 0x02);
225 			input_sync(dev);
226 
227 			/* Check if an effect was just started or stopped */
228 			i = data[1] & 0x7f;
229 			if (data[1] & 0x80) {
230 				if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
231 				/* Report play event */
232 				input_report_ff_status(dev, i, FF_STATUS_PLAYING);
233 				}
234 			}
235 			else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
236 				/* Report stop event */
237 				input_report_ff_status(dev, i, FF_STATUS_STOPPED);
238 			}
239 			if (LO(cmd) > 3) {
240 				int j;
241 				for (j=3; j<LO(cmd); j+=2) {
242 					mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
243 				}
244 			}
245 			break;
246 	}
247 	being_used--;
248 }
249 
250 int iforce_get_id_packet(struct iforce *iforce, char *packet)
251 {
252 	DECLARE_WAITQUEUE(wait, current);
253 	int timeout = HZ; /* 1 second */
254 
255 	switch (iforce->bus) {
256 
257 	case IFORCE_USB:
258 
259 #ifdef CONFIG_JOYSTICK_IFORCE_USB
260 		iforce->cr.bRequest = packet[0];
261 		iforce->ctrl->dev = iforce->usbdev;
262 
263 		set_current_state(TASK_INTERRUPTIBLE);
264 		add_wait_queue(&iforce->wait, &wait);
265 
266 		if (usb_submit_urb(iforce->ctrl, GFP_ATOMIC)) {
267 			set_current_state(TASK_RUNNING);
268 			remove_wait_queue(&iforce->wait, &wait);
269 			return -1;
270 		}
271 
272 		while (timeout && iforce->ctrl->status == -EINPROGRESS)
273 			timeout = schedule_timeout(timeout);
274 
275 		set_current_state(TASK_RUNNING);
276 		remove_wait_queue(&iforce->wait, &wait);
277 
278 		if (!timeout) {
279 			usb_unlink_urb(iforce->ctrl);
280 			return -1;
281 		}
282 #else
283 		printk(KERN_ERR "iforce_get_id_packet: iforce->bus = USB!\n");
284 #endif
285 		break;
286 
287 	case IFORCE_232:
288 
289 #ifdef CONFIG_JOYSTICK_IFORCE_232
290 		iforce->expect_packet = FF_CMD_QUERY;
291 		iforce_send_packet(iforce, FF_CMD_QUERY, packet);
292 
293 		set_current_state(TASK_INTERRUPTIBLE);
294 		add_wait_queue(&iforce->wait, &wait);
295 
296 		while (timeout && iforce->expect_packet)
297 			timeout = schedule_timeout(timeout);
298 
299 		set_current_state(TASK_RUNNING);
300 		remove_wait_queue(&iforce->wait, &wait);
301 
302 		if (!timeout) {
303 			iforce->expect_packet = 0;
304 			return -1;
305 		}
306 #else
307 		printk(KERN_ERR "iforce_get_id_packet: iforce->bus = SERIO!\n");
308 #endif
309 		break;
310 
311 	default:
312 		printk(KERN_ERR "iforce_get_id_packet: iforce->bus = %d\n",
313 		       iforce->bus);
314 		break;
315 	}
316 
317 	return -(iforce->edata[0] != packet[0]);
318 }
319 
320