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 #include <asm/unaligned.h>
  10 #include "iforce.h"
  11
  12 static struct {
  13         __s32 x;
  14         __s32 y;
  15 } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  16
  17
  18 void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data)
  19 {
  20         dev_dbg(iforce->dev->dev.parent, "%s %s cmd = %04x, data = %*ph\n",
  21                 __func__, msg, cmd, LO(cmd), data);
  22 }
  23
  24 /*
  25  * Send a packet of bytes to the device
  26  */
  27 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
  28 {
  29         /* Copy data to buffer */
  30         int n = LO(cmd);
  31         int c;
  32         int empty;
  33         int head, tail;
  34         unsigned long flags;
  35
  36 /*
  37  * Update head and tail of xmit buffer
  38  */
  39         spin_lock_irqsave(&iforce->xmit_lock, flags);
  40
  41         head = iforce->xmit.head;
  42         tail = iforce->xmit.tail;
  43
  44
  45         if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
  46                 dev_warn(&iforce->dev->dev,
  47                          "not enough space in xmit buffer to send new packet\n");
  48                 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  49                 return -1;
  50         }
  51
  52         empty = head == tail;
  53         XMIT_INC(iforce->xmit.head, n+2);
  54
  55 /*
  56  * Store packet in xmit buffer
  57  */
  58         iforce->xmit.buf[head] = HI(cmd);
  59         XMIT_INC(head, 1);
  60         iforce->xmit.buf[head] = LO(cmd);
  61         XMIT_INC(head, 1);
  62
  63         c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
  64         if (n < c) c=n;
  65
  66         memcpy(&iforce->xmit.buf[head],
  67                data,
  68                c);
  69         if (n != c) {
  70                 memcpy(&iforce->xmit.buf[0],
  71                        data + c,
  72                        n - c);
  73         }
  74         XMIT_INC(head, n);
  75
  76         spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  77 /*
  78  * If necessary, start the transmission
  79  */
  80         if (empty)
  81                 iforce->xport_ops->xmit(iforce);
  82
  83         return 0;
  84 }
  85 EXPORT_SYMBOL(iforce_send_packet);
  86
  87 /* Start or stop an effect */
  88 int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
  89 {
  90         unsigned char data[3];
  91
  92         data[0] = LO(id);
  93         data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
  94         data[2] = LO(value);
  95         return iforce_send_packet(iforce, FF_CMD_PLAY, data);
  96 }
  97
  98 /* Mark an effect that was being updated as ready. That means it can be updated
  99  * again */
 100 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
 101 {
 102         int i;
 103
 104         if (!iforce->dev->ff)
 105                 return 0;
 106
 107         for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
 108                 if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
 109                     (iforce->core_effects[i].mod1_chunk.start == addr ||
 110                      iforce->core_effects[i].mod2_chunk.start == addr)) {
 111                         clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
 112                         return 0;
 113                 }
 114         }
 115         dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
 116         return -1;
 117 }
 118
 119 static void iforce_report_hats_buttons(struct iforce *iforce, u8 *data)
 120 {
 121         struct input_dev *dev = iforce->dev;
 122         int i;
 123
 124         input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
 125         input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
 126
 127         for (i = 0; iforce->type->btn[i] >= 0; i++)
 128                 input_report_key(dev, iforce->type->btn[i],
 129                                  data[(i >> 3) + 5] & (1 << (i & 7)));
 130
 131         /* If there are untouched bits left, interpret them as the second hat */
 132         if (i <= 8) {
 133                 u8 btns = data[6];
 134
 135                 if (test_bit(ABS_HAT1X, dev->absbit)) {
 136                         if (btns & BIT(3))
 137                                 input_report_abs(dev, ABS_HAT1X, -1);
 138                         else if (btns & BIT(1))
 139                                 input_report_abs(dev, ABS_HAT1X, 1);
 140                         else
 141                                 input_report_abs(dev, ABS_HAT1X, 0);
 142                 }
 143
 144                 if (test_bit(ABS_HAT1Y, dev->absbit)) {
 145                         if (btns & BIT(0))
 146                                 input_report_abs(dev, ABS_HAT1Y, -1);
 147                         else if (btns & BIT(2))
 148                                 input_report_abs(dev, ABS_HAT1Y, 1);
 149                         else
 150                                 input_report_abs(dev, ABS_HAT1Y, 0);
 151                 }
 152         }
 153 }
 154
 155 void iforce_process_packet(struct iforce *iforce,
 156                            u8 packet_id, u8 *data, size_t len)
 157 {
 158         struct input_dev *dev = iforce->dev;
 159         int i, j;
 160
 161         switch (packet_id) {
 162
 163         case 0x01:      /* joystick position data */
 164                 input_report_abs(dev, ABS_X,
 165                                  (__s16) get_unaligned_le16(data));
 166                 input_report_abs(dev, ABS_Y,
 167                                  (__s16) get_unaligned_le16(data + 2));
 168                 input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
 169
 170                 if (len >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
 171                         input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
 172
 173                 iforce_report_hats_buttons(iforce, data);
 174
 175                 input_sync(dev);
 176                 break;
 177
 178         case 0x03:      /* wheel position data */
 179                 input_report_abs(dev, ABS_WHEEL,
 180                                  (__s16) get_unaligned_le16(data));
 181                 input_report_abs(dev, ABS_GAS,   255 - data[2]);
 182                 input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
 183
 184                 iforce_report_hats_buttons(iforce, data);
 185
 186                 input_sync(dev);
 187                 break;
 188
 189         case 0x02:      /* status report */
 190                 input_report_key(dev, BTN_DEAD, data[0] & 0x02);
 191                 input_sync(dev);
 192
 193                 /* Check if an effect was just started or stopped */
 194                 i = data[1] & 0x7f;
 195                 if (data[1] & 0x80) {
 196                         if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 197                                 /* Report play event */
 198                                 input_report_ff_status(dev, i, FF_STATUS_PLAYING);
 199                         }
 200                 } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 201                         /* Report stop event */
 202                         input_report_ff_status(dev, i, FF_STATUS_STOPPED);
 203                 }
 204
 205                 for (j = 3; j < len; j += 2)
 206                         mark_core_as_ready(iforce, get_unaligned_le16(data + j));
 207
 208                 break;
 209         }
 210 }
 211 EXPORT_SYMBOL(iforce_process_packet);