evdev.c

   1 /*
   2  * Copyright © 2008 Kristian Høgsberg
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <linux/input.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24
  25 #include <linux/input.h>
  26
  27 #include "wayland.h"
  28 #include "wayland-system-compositor.h"
  29
  30 struct evdev_input_device {
  31         struct wlsc_input_device *device;
  32         struct wl_event_source *source;
  33         int tool, new_x, new_y;
  34         int base_x, base_y;
  35         int fd;
  36 };
  37
  38 static void evdev_input_device_data(int fd, uint32_t mask, void *data)
  39 {
  40         struct evdev_input_device *device = data;
  41         struct input_event ev[8], *e, *end;
  42         int len, value, dx, dy, absolute_event;
  43         int x, y;
  44
  45         dx = 0;
  46         dy = 0;
  47         absolute_event = 0;
  48         wlsc_device_get_position(device->device, &x, &y);
  49
  50         len = read(fd, &ev, sizeof ev);
  51         if (len < 0 || len % sizeof e[0] != 0) {
  52                 /* FIXME: handle error... reopen device? */;
  53                 return;
  54         }
  55
  56         e = ev;
  57         end = (void *) ev + len;
  58         for (e = ev; e < end; e++) {
  59                 /* Get the signed value, earlier kernels had this as unsigned */
  60                 value = e->value;
  61
  62                 switch (e->type) {
  63                 case EV_REL:
  64                         switch (e->code) {
  65                         case REL_X:
  66                                 dx += value;
  67                                 break;
  68
  69                         case REL_Y:
  70                                 dy += value;
  71                                 break;
  72                         }
  73                         break;
  74
  75                 case EV_ABS:
  76                         absolute_event = 1;
  77                         switch (e->code) {
  78                         case ABS_X:
  79                                 if (device->new_x) {
  80                                         device->base_x = x - value;
  81                                         device->new_x = 0;
  82                                 }
  83                                 x = device->base_x + value;
  84                                 break;
  85                         case ABS_Y:
  86                                 if (device->new_y) {
  87                                         device->base_y = y - value;
  88                                         device->new_y = 0;
  89                                 }
  90                                 y = device->base_y + value;
  91                                 break;
  92                         }
  93                         break;
  94
  95                 case EV_KEY:
  96                         if (value == 2)
  97                                 break;
  98
  99                         switch (e->code) {
 100                         case BTN_TOUCH:
 101                         case BTN_TOOL_PEN:
 102                         case BTN_TOOL_RUBBER:
 103                         case BTN_TOOL_BRUSH:
 104                         case BTN_TOOL_PENCIL:
 105                         case BTN_TOOL_AIRBRUSH:
 106                         case BTN_TOOL_FINGER:
 107                         case BTN_TOOL_MOUSE:
 108                         case BTN_TOOL_LENS:
 109                                 if (device->tool == 0 && value) {
 110                                         device->new_x = 1;
 111                                         device->new_y = 1;
 112                                 }
 113                                 device->tool = value ? e->code : 0;
 114                                 break;
 115
 116                         case BTN_LEFT:
 117                         case BTN_RIGHT:
 118                         case BTN_MIDDLE:
 119                         case BTN_SIDE:
 120                         case BTN_EXTRA:
 121                         case BTN_FORWARD:
 122                         case BTN_BACK:
 123                         case BTN_TASK:
 124                                 notify_button(device->device, e->code, value);
 125                                 break;
 126
 127                         default:
 128                                 notify_key(device->device, e->code, value);
 129                                 break;
 130                         }
 131                 }
 132         }
 133
 134         if (dx != 0 || dy != 0)
 135                 notify_motion(device->device, x + dx, y + dy);
 136         if (absolute_event && device->tool)
 137                 notify_motion(device->device, x, y);
 138 }
 139
 140 struct evdev_input_device *
 141 evdev_input_device_create(struct wlsc_input_device *master,
 142                           struct wl_display *display, const char *path)
 143 {
 144         struct evdev_input_device *device;
 145         struct wl_event_loop *loop;
 146
 147         device = malloc(sizeof *device);
 148         if (device == NULL)
 149                 return NULL;
 150
 151         device->tool = 1;
 152         device->new_x = 1;
 153         device->new_y = 1;
 154         device->device = master;
 155
 156         device->fd = open(path, O_RDONLY);
 157         if (device->fd < 0) {
 158                 free(device);
 159                 fprintf(stderr, "couldn't create pointer for %s: %m\n", path);
 160                 return NULL;
 161         }
 162
 163         loop = wl_display_get_event_loop(display);
 164         device->source = wl_event_loop_add_fd(loop, device->fd,
 165                                               WL_EVENT_READABLE,
 166                                               evdev_input_device_data, device);
 167         if (device->source == NULL) {
 168                 close(device->fd);
 169                 free(device);
 170                 return NULL;
 171         }
 172
 173         return device;
 174 }