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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 2000-2002 Vojtech Pavlik <vojtech@ucw.cz>
   4  *  Copyright (c) 2001-2002, 2007 Johann Deneux <johann.deneux@gmail.com>
   5  *
   6  *  USB/RS232 I-Force joysticks and wheels.
   7  */
   8
   9 /*
  10  */
  11
  12 #include "iforce.h"
  13
  14 static struct {
  15         __s32 x;
  16         __s32 y;
  17 } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  18
  19
  20 void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data)
  21 {
  22         dev_dbg(iforce->dev->dev.parent, "%s %s cmd = %04x, data = %*ph\n",
  23                 __func__, msg, cmd, LO(cmd), data);
  24 }
  25
  26 /*
  27  * Send a packet of bytes to the device
  28  */
  29 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
  30 {
  31         /* Copy data to buffer */
  32         int n = LO(cmd);
  33         int c;
  34         int empty;
  35         int head, tail;
  36         unsigned long flags;
  37
  38 /*
  39  * Update head and tail of xmit buffer
  40  */
  41         spin_lock_irqsave(&iforce->xmit_lock, flags);
  42
  43         head = iforce->xmit.head;
  44         tail = iforce->xmit.tail;
  45
  46
  47         if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
  48                 dev_warn(&iforce->dev->dev,
  49                          "not enough space in xmit buffer to send new packet\n");
  50                 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  51                 return -1;
  52         }
  53
  54         empty = head == tail;
  55         XMIT_INC(iforce->xmit.head, n+2);
  56
  57 /*
  58  * Store packet in xmit buffer
  59  */
  60         iforce->xmit.buf[head] = HI(cmd);
  61         XMIT_INC(head, 1);
  62         iforce->xmit.buf[head] = LO(cmd);
  63         XMIT_INC(head, 1);
  64
  65         c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
  66         if (n < c) c=n;
  67
  68         memcpy(&iforce->xmit.buf[head],
  69                data,
  70                c);
  71         if (n != c) {
  72                 memcpy(&iforce->xmit.buf[0],
  73                        data + c,
  74                        n - c);
  75         }
  76         XMIT_INC(head, n);
  77
  78         spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  79 /*
  80  * If necessary, start the transmission
  81  */
  82         switch (iforce->bus) {
  83
  84 #ifdef CONFIG_JOYSTICK_IFORCE_232
  85                 case IFORCE_232:
  86                 if (empty)
  87                         iforce_serial_xmit(iforce);
  88                 break;
  89 #endif
  90 #ifdef CONFIG_JOYSTICK_IFORCE_USB
  91                 case IFORCE_USB:
  92
  93                 if (iforce->usbdev && empty &&
  94                         !test_and_set_bit(IFORCE_XMIT_RUNNING, iforce->xmit_flags)) {
  95
  96                         iforce_usb_xmit(iforce);
  97                 }
  98                 break;
  99 #endif
 100         }
 101         return 0;
 102 }
 103
 104 /* Start or stop an effect */
 105 int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
 106 {
 107         unsigned char data[3];
 108
 109         data[0] = LO(id);
 110         data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
 111         data[2] = LO(value);
 112         return iforce_send_packet(iforce, FF_CMD_PLAY, data);
 113 }
 114
 115 /* Mark an effect that was being updated as ready. That means it can be updated
 116  * again */
 117 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
 118 {
 119         int i;
 120
 121         if (!iforce->dev->ff)
 122                 return 0;
 123
 124         for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
 125                 if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
 126                     (iforce->core_effects[i].mod1_chunk.start == addr ||
 127                      iforce->core_effects[i].mod2_chunk.start == addr)) {
 128                         clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
 129                         return 0;
 130                 }
 131         }
 132         dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
 133         return -1;
 134 }
 135
 136 void iforce_process_packet(struct iforce *iforce, u16 cmd, unsigned char *data)
 137 {
 138         struct input_dev *dev = iforce->dev;
 139         int i;
 140         static int being_used = 0;
 141
 142         if (being_used)
 143                 dev_warn(&iforce->dev->dev,
 144                          "re-entrant call to iforce_process %d\n", being_used);
 145         being_used++;
 146
 147 #ifdef CONFIG_JOYSTICK_IFORCE_232
 148         if (HI(iforce->expect_packet) == HI(cmd)) {
 149                 iforce->expect_packet = 0;
 150                 iforce->ecmd = cmd;
 151                 memcpy(iforce->edata, data, IFORCE_MAX_LENGTH);
 152         }
 153 #endif
 154         wake_up(&iforce->wait);
 155
 156         if (!iforce->type) {
 157                 being_used--;
 158                 return;
 159         }
 160
 161         switch (HI(cmd)) {
 162
 163                 case 0x01:      /* joystick position data */
 164                 case 0x03:      /* wheel position data */
 165                         if (HI(cmd) == 1) {
 166                                 input_report_abs(dev, ABS_X, (__s16) (((__s16)data[1] << 8) | data[0]));
 167                                 input_report_abs(dev, ABS_Y, (__s16) (((__s16)data[3] << 8) | data[2]));
 168                                 input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
 169                                 if (LO(cmd) >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
 170                                         input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
 171                         } else {
 172                                 input_report_abs(dev, ABS_WHEEL, (__s16) (((__s16)data[1] << 8) | data[0]));
 173                                 input_report_abs(dev, ABS_GAS,   255 - data[2]);
 174                                 input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
 175                         }
 176
 177                         input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
 178                         input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
 179
 180                         for (i = 0; iforce->type->btn[i] >= 0; i++)
 181                                 input_report_key(dev, iforce->type->btn[i], data[(i >> 3) + 5] & (1 << (i & 7)));
 182
 183                         /* If there are untouched bits left, interpret them as the second hat */
 184                         if (i <= 8) {
 185                                 int btns = data[6];
 186                                 if (test_bit(ABS_HAT1X, dev->absbit)) {
 187                                         if (btns & 8) input_report_abs(dev, ABS_HAT1X, -1);
 188                                         else if (btns & 2) input_report_abs(dev, ABS_HAT1X, 1);
 189                                         else input_report_abs(dev, ABS_HAT1X, 0);
 190                                 }
 191                                 if (test_bit(ABS_HAT1Y, dev->absbit)) {
 192                                         if (btns & 1) input_report_abs(dev, ABS_HAT1Y, -1);
 193                                         else if (btns & 4) input_report_abs(dev, ABS_HAT1Y, 1);
 194                                         else input_report_abs(dev, ABS_HAT1Y, 0);
 195                                 }
 196                         }
 197
 198                         input_sync(dev);
 199
 200                         break;
 201
 202                 case 0x02:      /* status report */
 203                         input_report_key(dev, BTN_DEAD, data[0] & 0x02);
 204                         input_sync(dev);
 205
 206                         /* Check if an effect was just started or stopped */
 207                         i = data[1] & 0x7f;
 208                         if (data[1] & 0x80) {
 209                                 if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 210                                         /* Report play event */
 211                                         input_report_ff_status(dev, i, FF_STATUS_PLAYING);
 212                                 }
 213                         } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 214                                 /* Report stop event */
 215                                 input_report_ff_status(dev, i, FF_STATUS_STOPPED);
 216                         }
 217                         if (LO(cmd) > 3) {
 218                                 int j;
 219                                 for (j = 3; j < LO(cmd); j += 2)
 220                                         mark_core_as_ready(iforce, data[j] | (data[j+1]<<8));
 221                         }
 222                         break;
 223         }
 224         being_used--;
 225 }
 226
 227 int iforce_get_id_packet(struct iforce *iforce, char *packet)
 228 {
 229         switch (iforce->bus) {
 230
 231         case IFORCE_USB: {
 232 #ifdef CONFIG_JOYSTICK_IFORCE_USB
 233                 int status;
 234
 235                 iforce->cr.bRequest = packet[0];
 236                 iforce->ctrl->dev = iforce->usbdev;
 237
 238                 status = usb_submit_urb(iforce->ctrl, GFP_KERNEL);
 239                 if (status) {
 240                         dev_err(&iforce->intf->dev,
 241                                 "usb_submit_urb failed %d\n", status);
 242                         return -1;
 243                 }
 244
 245                 wait_event_interruptible_timeout(iforce->wait,
 246                         iforce->ctrl->status != -EINPROGRESS, HZ);
 247
 248                 if (iforce->ctrl->status) {
 249                         dev_dbg(&iforce->intf->dev,
 250                                 "iforce->ctrl->status = %d\n",
 251                                 iforce->ctrl->status);
 252                         usb_unlink_urb(iforce->ctrl);
 253                         return -1;
 254                 }
 255 #else
 256                 printk(KERN_DEBUG "iforce_get_id_packet: iforce->bus = USB!\n");
 257 #endif
 258                 }
 259                 break;
 260
 261         case IFORCE_232:
 262
 263 #ifdef CONFIG_JOYSTICK_IFORCE_232
 264                 iforce->expect_packet = FF_CMD_QUERY;
 265                 iforce_send_packet(iforce, FF_CMD_QUERY, packet);
 266
 267                 wait_event_interruptible_timeout(iforce->wait,
 268                         !iforce->expect_packet, HZ);
 269
 270                 if (iforce->expect_packet) {
 271                         iforce->expect_packet = 0;
 272                         return -1;
 273                 }
 274 #else
 275                 dev_err(&iforce->dev->dev,
 276                         "iforce_get_id_packet: iforce->bus = SERIO!\n");
 277 #endif
 278                 break;
 279
 280         default:
 281                 dev_err(&iforce->dev->dev,
 282                         "iforce_get_id_packet: iforce->bus = %d\n",
 283                         iforce->bus);
 284                 break;
 285         }
 286
 287         return -(iforce->edata[0] != packet[0]);
 288 }
 289