kernel/drivers/input/joystick/iforce/iforce-packets.c

   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  * Should you need to contact me, the author, you can do so either by
  24  * e-mail - mail your message to <vojtech@ucw.cz>, 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 {
  31         __s32 x;
  32         __s32 y;
  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 &&
 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         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
 265                 wait_event_interruptible_timeout(iforce->wait,
 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
 287                 wait_event_interruptible_timeout(iforce->wait,
 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