frontend/in_tsbutton.c

   1 /*
   2  * (C) Gražvydas "notaz" Ignotas, 2011
   3  *
   4  * This work is licensed under the terms of any of these licenses
   5  * (at your option):
   6  *  - GNU GPL, version 2 or later.
   7  *  - GNU LGPL, version 2.1 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10
  11 #include <stdio.h>
  12 #include <tslib.h>
  13
  14 #include "common/input.h"
  15 #include "in_tsbutton.h"
  16
  17 #define IN_TSBUTTON_PREFIX "tsbutton:"
  18 #define IN_TSBUTTON_COUNT 4
  19 static int tsbutton_down_id;
  20 static int last_tsbutton_id;
  21
  22 #define TS_WIDTH 320
  23 #define TS_HEIGHT 240
  24
  25 // HACK: stealing this from plugin_lib
  26 extern void *tsdev;
  27 extern int (*pts_read)(struct tsdev *dev, struct ts_sample *sample, int nr);
  28 extern int (*pts_fd)(struct tsdev *dev);
  29
  30 static const char * const in_tsbutton_keys[IN_TSBUTTON_COUNT] = {
  31         "TS1", "TS2", "TS3", "TS4",
  32 };
  33
  34 static void in_tsbutton_probe(void)
  35 {
  36         struct tsdev *dev = tsdev;
  37         if (dev == NULL) {
  38                 fprintf(stderr, "in_tsbutton_probe: missing tsdev\n");
  39                 return;
  40         }
  41
  42         in_register(IN_TSBUTTON_PREFIX "touchscreen as buttons",
  43                 pts_fd(dev), NULL, IN_TSBUTTON_COUNT, in_tsbutton_keys, 0);
  44 }
  45
  46 static const char * const *
  47 in_tsbutton_get_key_names(int *count)
  48 {
  49         *count = IN_TSBUTTON_COUNT;
  50         return in_tsbutton_keys;
  51 }
  52
  53 static int update_button(void)
  54 {
  55         struct tsdev *dev = tsdev;
  56         struct ts_sample sample;
  57         int sx = 0, sy = 0, sp = 0, updated = 0;
  58
  59         if (dev == NULL)
  60                 return -1;
  61
  62         while (pts_read(dev, &sample, 1) > 0) {
  63                 sx = sample.x;
  64                 sy = sample.y;
  65                 sp = sample.pressure;
  66                 updated = 1;
  67         }
  68
  69         if (updated) {
  70                 if (sp == 0)
  71                         tsbutton_down_id = -1;
  72                 else {
  73                         // 0 1
  74                         // 2 3
  75                         tsbutton_down_id = 0;
  76                         if (sx > TS_WIDTH / 2)
  77                                 tsbutton_down_id++;
  78                         if (sy > TS_HEIGHT / 2)
  79                                 tsbutton_down_id += 2;
  80                 }
  81         }
  82
  83         return 0;
  84 }
  85
  86 static int in_tsbutton_update(void *drv_data, const int *binds, int *result)
  87 {
  88         int ret, t;
  89
  90         ret = update_button();
  91         if (ret != 0)
  92                 return ret;
  93
  94         if (tsbutton_down_id >= 0)
  95                 for (t = 0; t < IN_BINDTYPE_COUNT; t++)
  96                         result[t] |= binds[IN_BIND_OFFS(tsbutton_down_id, t)];
  97
  98         return 0;
  99 }
 100
 101 static int in_tsbutton_update_keycode(void *data, int *is_down)
 102 {
 103         int ret, ret_kc = -1, ret_down = 0;
 104
 105         ret = update_button();
 106         if (ret != 0)
 107                 return ret;
 108
 109         if (tsbutton_down_id == last_tsbutton_id)
 110                 return -1;
 111
 112         if (tsbutton_down_id >= 0) {
 113                 if (last_tsbutton_id >= 0) {
 114                         ret_kc = last_tsbutton_id;
 115                         last_tsbutton_id = -1;
 116                 }
 117                 else {
 118                         ret_down = 1;
 119                         ret_kc = tsbutton_down_id;
 120                         last_tsbutton_id = tsbutton_down_id;
 121                 }
 122         }
 123         else {
 124                 ret_kc = last_tsbutton_id;
 125                 last_tsbutton_id = -1;
 126         }
 127
 128         if (is_down != NULL)
 129                 *is_down = ret_down;
 130
 131         return ret_kc;
 132 }
 133
 134 static const in_drv_t in_tsbutton_drv = {
 135         .prefix         = IN_TSBUTTON_PREFIX,
 136         .probe          = in_tsbutton_probe,
 137         .get_key_names  = in_tsbutton_get_key_names,
 138         .update         = in_tsbutton_update,
 139         .update_keycode = in_tsbutton_update_keycode,
 140 };
 141
 142 void in_tsbutton_init(void)
 143 {
 144         tsbutton_down_id = last_tsbutton_id = -1;
 145         in_register_driver(&in_tsbutton_drv);
 146 }
 147