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
  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