1 /*
2  *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
3  *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
4  *
5  *  USB/RS232 I-Force joysticks and wheels.
6  */
7 
8 /*
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.
13  *
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.
18  *
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
22  */
23 
24 #include "iforce.h"
25 
26 static struct {
27 	__s32 x;
28 	__s32 y;
29 } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
30 
31 
32 void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data)
33 {
34 	dev_dbg(iforce->dev->dev.parent, "%s %s cmd = %04x, data = %*ph\n",
35 		__func__, msg, cmd, LO(cmd), data);
36 }
37 
38 /*
39  * Send a packet of bytes to the device
40  */
41 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
42 {
43 	/* Copy data to buffer */
44 	int n = LO(cmd);
45 	int c;
46 	int empty;
47 	int head, tail;
48 	unsigned long flags;
49 
50 /*
51  * Update head and tail of xmit buffer
52  */
53 	spin_lock_irqsave(&iforce->xmit_lock, flags);
54 
55 	head = iforce->xmit.head;
56 	tail = iforce->xmit.tail;
57 
58 
59 	if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
60 		dev_warn(&iforce->dev->dev,
61 			 "not enough space in xmit buffer to send new packet\n");
62 		spin_unlock_irqrestore(&iforce->xmit_lock, flags);
63 		return -1;
64 	}
65 
66 	empty = head == tail;
67 	XMIT_INC(iforce->xmit.head, n+2);
68 
69 /*
70  * Store packet in xmit buffer
71  */
72 	iforce->xmit.buf[head] = HI(cmd);
73 	XMIT_INC(head, 1);
74 	iforce->xmit.buf[head] = LO(cmd);
75 	XMIT_INC(head, 1);
76 
77 	c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
78 	if (n < c) c=n;
79 
80 	memcpy(&iforce->xmit.buf[head],
81 	       data,
82 	       c);
83 	if (n != c) {
84 		memcpy(&iforce->xmit.buf[0],
85 		       data + c,
86 		       n - c);
87 	}
88 	XMIT_INC(head, n);
89 
90 	spin_unlock_irqrestore(&iforce->xmit_lock, flags);
91 /*
92  * If necessary, start the transmission
93  */
94 	switch (iforce->bus) {
95 
96 #ifdef CONFIG_JOYSTICK_IFORCE_232
97 		case IFORCE_232:
98 		if (empty)
99 			iforce_serial_xmit(iforce);
100 		break;
101 #endif
102 #ifdef CONFIG_JOYSTICK_IFORCE_USB
103 		case IFORCE_USB:
104 
105 		if (iforce->usbdev && empty &&
106 			!test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
107 
108 			iforce_usb_xmit(iforce);
109 		}
110 		break;
111 #endif
112 	}
113 	return 0;
114 }
115 
116 /* Start or stop an effect */
117 int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
118 {
119 	unsigned char data[3];
120 
121 	data[0] = LO(id);
122 	data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
123 	data[2] = LO(value);
124 	return iforce_send_packet(iforce, FF_CMD_PLAY, data);
125 }
126 
127 /* Mark an effect that was being updated as ready. That means it can be updated
128  * again */
129 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
130 {
131 	int i;
132 
133 	if (!iforce->dev->ff)
134 		return 0;
135 
136 	for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
137 		if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
138 		    (iforce->core_effects[i].mod1_chunk.start == addr ||
139 		     iforce->core_effects[i].mod2_chunk.start == addr)) {
140 			clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
141 			return 0;
142 		}
143 	}
144 	dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
145 	return -1;
146 }
147 
148 void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
149 {
150 	struct input_dev *dev = iforce->dev;
151 	int i;
152 	static int being_used = 0;
153 
154 	if (being_used)
155 		dev_warn(&iforce->dev->dev,
156 			 "re-entrant call to iforce_process %d\n", being_used);
157 	being_used++;
158 
159 #ifdef CONFIG_JOYSTICK_IFORCE_232
160 	if (HI(iforce->expect_packet) == HI(cmd)) {
161 		iforce->expect_packet = 0;
162 		iforce->ecmd = cmd;
163 		memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
164 	}
165 #endif
166 	wake_up(&iforce->wait);
167 
168 	if (!iforce->type) {
169 		being_used--;
170 		return;
171 	}
172 
173 	switch (HI(cmd)) {
174 
175 		case 0x01:	/* joystick position data */
176 		case 0x03:	/* wheel position data */
177 			if (HI(cmd) == 1) {
178 				input_report_abs(dev, ABS_X, (__s16) (((__s16)data[1] << 8) | data[0]));
179 				input_report_abs(dev, ABS_Y, (__s16) (((__s16)data[3] << 8) | data[2]));
180 				input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
181 				if (LO(cmd) >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
182 					input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
183 			} else {
184 				input_report_abs(dev, ABS_WHEEL, (__s16) (((__s16)data[1] << 8) | data[0]));
185 				input_report_abs(dev, ABS_GAS,   255 - data[2]);
186 				input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
187 			}
188 
189 			input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
190 			input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
191 
192 			for (i = 0; iforce->type->btn[i] >= 0; i++)
193 				input_report_key(dev, iforce->type->btn[i], data[(i >> 3) + 5] & (1 << (i & 7)));
194 
195 			/* If there are untouched bits left, interpret them as the second hat */
196 			if (i <= 8) {
197 				int btns = data[6];
198 				if (test_bit(ABS_HAT1X, dev->absbit)) {
199 					if (btns & 8) input_report_abs(dev, ABS_HAT1X, -1);
200 					else if (btns & 2) input_report_abs(dev, ABS_HAT1X, 1);
201 					else input_report_abs(dev, ABS_HAT1X, 0);
202 				}
203 				if (test_bit(ABS_HAT1Y, dev->absbit)) {
204 					if (btns & 1) input_report_abs(dev, ABS_HAT1Y, -1);
205 					else if (btns & 4) input_report_abs(dev, ABS_HAT1Y, 1);
206 					else input_report_abs(dev, ABS_HAT1Y, 0);
207 				}
208 			}
209 
210 			input_sync(dev);
211 
212 			break;
213 
214 		case 0x02:	/* status report */
215 			input_report_key(dev, BTN_DEAD, data[0] & 0x02);
216 			input_sync(dev);
217 
218 			/* Check if an effect was just started or stopped */
219 			i = data[1] & 0x7f;
220 			if (data[1] & 0x80) {
221 				if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
222 					/* Report play event */
223 					input_report_ff_status(dev, i, FF_STATUS_PLAYING);
224 				}
225 			} else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
226 				/* Report stop event */
227 				input_report_ff_status(dev, i, FF_STATUS_STOPPED);
228 			}
229 			if (LO(cmd) > 3) {
230 				int j;
231 				for (j = 3; j < LO(cmd); j += 2)
232 					mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
233 			}
234 			break;
235 	}
236 	being_used--;
237 }
238 
239 int iforce_get_id_packet(struct iforce *iforce, char *packet)
240 {
241 	switch (iforce->bus) {
242 
243 	case IFORCE_USB: {
244 #ifdef CONFIG_JOYSTICK_IFORCE_USB
245 		int status;
246 
247 		iforce->cr.bRequest = packet[0];
248 		iforce->ctrl->dev = iforce->usbdev;
249 
250 		status = usb_submit_urb(iforce->ctrl, GFP_KERNEL);
251 		if (status) {
252 			dev_err(&iforce->intf->dev,
253 				"usb_submit_urb failed %d\n", status);
254 			return -1;
255 		}
256 
257 		wait_event_interruptible_timeout(iforce->wait,
258 			iforce->ctrl->status != -EINPROGRESS, HZ);
259 
260 		if (iforce->ctrl->status) {
261 			dev_dbg(&iforce->intf->dev,
262 				"iforce->ctrl->status = %d\n",
263 				iforce->ctrl->status);
264 			usb_unlink_urb(iforce->ctrl);
265 			return -1;
266 		}
267 #else
268 		printk(KERN_DEBUG "iforce_get_id_packet: iforce->bus = USB!\n");
269 #endif
270 		}
271 		break;
272 
273 	case IFORCE_232:
274 
275 #ifdef CONFIG_JOYSTICK_IFORCE_232
276 		iforce->expect_packet = FF_CMD_QUERY;
277 		iforce_send_packet(iforce, FF_CMD_QUERY, packet);
278 
279 		wait_event_interruptible_timeout(iforce->wait,
280 			!iforce->expect_packet, HZ);
281 
282 		if (iforce->expect_packet) {
283 			iforce->expect_packet = 0;
284 			return -1;
285 		}
286 #else
287 		dev_err(&iforce->dev->dev,
288 			"iforce_get_id_packet: iforce->bus = SERIO!\n");
289 #endif
290 		break;
291 
292 	default:
293 		dev_err(&iforce->dev->dev,
294 			"iforce_get_id_packet: iforce->bus = %d\n",
295 			iforce->bus);
296 		break;
297 	}
298 
299 	return -(iforce->edata[0] != packet[0]);
300 }
301 
302