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 <asm/unaligned.h>
  13 #include "iforce.h"
  14
  15 static struct {
  16         __s32 x;
  17         __s32 y;
  18 } iforce_hat_to_axis[16] = {{ 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};
  19
  20
  21 void iforce_dump_packet(struct iforce *iforce, char *msg, u16 cmd, unsigned char *data)
  22 {
  23         dev_dbg(iforce->dev->dev.parent, "%s %s cmd = %04x, data = %*ph\n",
  24                 __func__, msg, cmd, LO(cmd), data);
  25 }
  26
  27 /*
  28  * Send a packet of bytes to the device
  29  */
  30 int iforce_send_packet(struct iforce *iforce, u16 cmd, unsigned char* data)
  31 {
  32         /* Copy data to buffer */
  33         int n = LO(cmd);
  34         int c;
  35         int empty;
  36         int head, tail;
  37         unsigned long flags;
  38
  39 /*
  40  * Update head and tail of xmit buffer
  41  */
  42         spin_lock_irqsave(&iforce->xmit_lock, flags);
  43
  44         head = iforce->xmit.head;
  45         tail = iforce->xmit.tail;
  46
  47
  48         if (CIRC_SPACE(head, tail, XMIT_SIZE) < n+2) {
  49                 dev_warn(&iforce->dev->dev,
  50                          "not enough space in xmit buffer to send new packet\n");
  51                 spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  52                 return -1;
  53         }
  54
  55         empty = head == tail;
  56         XMIT_INC(iforce->xmit.head, n+2);
  57
  58 /*
  59  * Store packet in xmit buffer
  60  */
  61         iforce->xmit.buf[head] = HI(cmd);
  62         XMIT_INC(head, 1);
  63         iforce->xmit.buf[head] = LO(cmd);
  64         XMIT_INC(head, 1);
  65
  66         c = CIRC_SPACE_TO_END(head, tail, XMIT_SIZE);
  67         if (n < c) c=n;
  68
  69         memcpy(&iforce->xmit.buf[head],
  70                data,
  71                c);
  72         if (n != c) {
  73                 memcpy(&iforce->xmit.buf[0],
  74                        data + c,
  75                        n - c);
  76         }
  77         XMIT_INC(head, n);
  78
  79         spin_unlock_irqrestore(&iforce->xmit_lock, flags);
  80 /*
  81  * If necessary, start the transmission
  82  */
  83         if (empty)
  84                 iforce->xport_ops->xmit(iforce);
  85
  86         return 0;
  87 }
  88 EXPORT_SYMBOL(iforce_send_packet);
  89
  90 /* Start or stop an effect */
  91 int iforce_control_playback(struct iforce* iforce, u16 id, unsigned int value)
  92 {
  93         unsigned char data[3];
  94
  95         data[0] = LO(id);
  96         data[1] = (value > 0) ? ((value > 1) ? 0x41 : 0x01) : 0;
  97         data[2] = LO(value);
  98         return iforce_send_packet(iforce, FF_CMD_PLAY, data);
  99 }
 100
 101 /* Mark an effect that was being updated as ready. That means it can be updated
 102  * again */
 103 static int mark_core_as_ready(struct iforce *iforce, unsigned short addr)
 104 {
 105         int i;
 106
 107         if (!iforce->dev->ff)
 108                 return 0;
 109
 110         for (i = 0; i < iforce->dev->ff->max_effects; ++i) {
 111                 if (test_bit(FF_CORE_IS_USED, iforce->core_effects[i].flags) &&
 112                     (iforce->core_effects[i].mod1_chunk.start == addr ||
 113                      iforce->core_effects[i].mod2_chunk.start == addr)) {
 114                         clear_bit(FF_CORE_UPDATE, iforce->core_effects[i].flags);
 115                         return 0;
 116                 }
 117         }
 118         dev_warn(&iforce->dev->dev, "unused effect %04x updated !!!\n", addr);
 119         return -1;
 120 }
 121
 122 static void iforce_report_hats_buttons(struct iforce *iforce, u8 *data)
 123 {
 124         struct input_dev *dev = iforce->dev;
 125         int i;
 126
 127         input_report_abs(dev, ABS_HAT0X, iforce_hat_to_axis[data[6] >> 4].x);
 128         input_report_abs(dev, ABS_HAT0Y, iforce_hat_to_axis[data[6] >> 4].y);
 129
 130         for (i = 0; iforce->type->btn[i] >= 0; i++)
 131                 input_report_key(dev, iforce->type->btn[i],
 132                                  data[(i >> 3) + 5] & (1 << (i & 7)));
 133
 134         /* If there are untouched bits left, interpret them as the second hat */
 135         if (i <= 8) {
 136                 u8 btns = data[6];
 137
 138                 if (test_bit(ABS_HAT1X, dev->absbit)) {
 139                         if (btns & BIT(3))
 140                                 input_report_abs(dev, ABS_HAT1X, -1);
 141                         else if (btns & BIT(1))
 142                                 input_report_abs(dev, ABS_HAT1X, 1);
 143                         else
 144                                 input_report_abs(dev, ABS_HAT1X, 0);
 145                 }
 146
 147                 if (test_bit(ABS_HAT1Y, dev->absbit)) {
 148                         if (btns & BIT(0))
 149                                 input_report_abs(dev, ABS_HAT1Y, -1);
 150                         else if (btns & BIT(2))
 151                                 input_report_abs(dev, ABS_HAT1Y, 1);
 152                         else
 153                                 input_report_abs(dev, ABS_HAT1Y, 0);
 154                 }
 155         }
 156 }
 157
 158 void iforce_process_packet(struct iforce *iforce,
 159                            u8 packet_id, u8 *data, size_t len)
 160 {
 161         struct input_dev *dev = iforce->dev;
 162         int i, j;
 163
 164         switch (packet_id) {
 165
 166         case 0x01:      /* joystick position data */
 167                 input_report_abs(dev, ABS_X,
 168                                  (__s16) get_unaligned_le16(data));
 169                 input_report_abs(dev, ABS_Y,
 170                                  (__s16) get_unaligned_le16(data + 2));
 171                 input_report_abs(dev, ABS_THROTTLE, 255 - data[4]);
 172
 173                 if (len >= 8 && test_bit(ABS_RUDDER ,dev->absbit))
 174                         input_report_abs(dev, ABS_RUDDER, (__s8)data[7]);
 175
 176                 iforce_report_hats_buttons(iforce, data);
 177
 178                 input_sync(dev);
 179                 break;
 180
 181         case 0x03:      /* wheel position data */
 182                 input_report_abs(dev, ABS_WHEEL,
 183                                  (__s16) get_unaligned_le16(data));
 184                 input_report_abs(dev, ABS_GAS,   255 - data[2]);
 185                 input_report_abs(dev, ABS_BRAKE, 255 - data[3]);
 186
 187                 iforce_report_hats_buttons(iforce, data);
 188
 189                 input_sync(dev);
 190                 break;
 191
 192         case 0x02:      /* status report */
 193                 input_report_key(dev, BTN_DEAD, data[0] & 0x02);
 194                 input_sync(dev);
 195
 196                 /* Check if an effect was just started or stopped */
 197                 i = data[1] & 0x7f;
 198                 if (data[1] & 0x80) {
 199                         if (!test_and_set_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 200                                 /* Report play event */
 201                                 input_report_ff_status(dev, i, FF_STATUS_PLAYING);
 202                         }
 203                 } else if (test_and_clear_bit(FF_CORE_IS_PLAYED, iforce->core_effects[i].flags)) {
 204                         /* Report stop event */
 205                         input_report_ff_status(dev, i, FF_STATUS_STOPPED);
 206                 }
 207
 208                 for (j = 3; j < len; j += 2)
 209                         mark_core_as_ready(iforce, get_unaligned_le16(data + j));
 210
 211                 break;
 212         }
 213 }
 214 EXPORT_SYMBOL(iforce_process_packet);