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iforce-packets.c
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1 /*
2  * Copyright (c) 2000-2002 Vojtech Pavlik <[email protected]>
3  * Copyright (c) 2001-2002, 2007 Johann Deneux <[email protected]>
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  * Should you need to contact me, the author, you can do so either by
24  * e-mail - mail your message to <[email protected]>, or by paper mail:
25  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
26  */
27 
28 #include "iforce.h"
29 
30 static struct {
33 } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
34 
35 
36 void iforce_dump_packet(char *msg, u16 cmd, unsigned char *data)
37 {
38  int i;
39 
40  printk(KERN_DEBUG __FILE__ ": %s cmd = %04x, data = ", msg, cmd);
41  for (i = 0; i < LO(cmd); i++)
42  printk("%02x ", data[i]);
43  printk("\n");
44 }
45 
46 /*
47  * Send a packet of bytes to the device
48  */
49 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
50 {
51  /* Copy data to buffer */
52  int n = LO(cmd);
53  int c;
54  int empty;
55  int head, tail;
56  unsigned long flags;
57 
58 /*
59  * Update head and tail of xmit buffer
60  */
61  spin_lock_irqsave(&iforce->xmit_lock, flags);
62 
63  head = iforce->xmit.head;
64  tail = iforce->xmit.tail;
65 
66 
67  if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
68  dev_warn(&iforce->dev->dev,
69  "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 &&
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  data[0] = LO(id);
130  data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
131  data[2] = LO(value);
132  return iforce_send_packet(iforce, FF_CMD_PLAY, data);
133 }
134 
135 /* Mark an effect that was being updated as ready. That means it can be updated
136  * again */
137 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
138 {
139  int i;
140 
141  if (!iforce->dev->ff)
142  return 0;
143 
144  for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
145  if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
146  (iforce->core_effects[i].mod1_chunk.start == addr ||
147  iforce->core_effects[i].mod2_chunk.start == addr)) {
148  clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
149  return 0;
150  }
151  }
152  dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
153  return -1;
154 }
155 
156 void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
157 {
158  struct input_dev *dev = iforce->dev;
159  int i;
160  static int being_used = 0;
161 
162  if (being_used)
163  dev_warn(&iforce->dev->dev,
164  "re-entrant call to iforce_process %d\n", 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  dev_err(&iforce->intf->dev,
261  "usb_submit_urb failed %d\n", status);
262  return -1;
263  }
264 
266  iforce->ctrl->status != -EINPROGRESS, HZ);
267 
268  if (iforce->ctrl->status) {
269  dev_dbg(&iforce->intf->dev,
270  "iforce->ctrl->status = %d\n",
271  iforce->ctrl->status);
272  usb_unlink_urb(iforce->ctrl);
273  return -1;
274  }
275 #else
276  printk(KERN_DEBUG "iforce_get_id_packet: iforce->bus = USB!\n");
277 #endif
278  }
279  break;
280 
281  case IFORCE_232:
282 
283 #ifdef CONFIG_JOYSTICK_IFORCE_232
284  iforce->expect_packet = FF_CMD_QUERY;
285  iforce_send_packet(iforce, FF_CMD_QUERY, packet);
286 
288  !iforce->expect_packet, HZ);
289 
290  if (iforce->expect_packet) {
291  iforce->expect_packet = 0;
292  return -1;
293  }
294 #else
295  dev_err(&iforce->dev->dev,
296  "iforce_get_id_packet: iforce->bus = SERIO!\n");
297 #endif
298  break;
299 
300  default:
301  dev_err(&iforce->dev->dev,
302  "iforce_get_id_packet: iforce->bus = %d\n",
303  iforce->bus);
304  break;
305  }
306 
307  return -(iforce->edata[0] != packet[0]);
308 }
309