evdev.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <linux/input.h>
   4 #include <fcntl.h>
   5 #include <unistd.h>
   6
   7 #include <linux/input.h>
   8
   9 #include "wayland.h"
  10
  11 struct wl_input_device {
  12         struct wl_object base;
  13         struct wl_event_source *source;
  14         struct wl_display *display;
  15         int fd;
  16         int tool;
  17         int32_t x, y;
  18 };
  19
  20 static const struct wl_method input_device_methods[] = {
  21 };
  22
  23 static const struct wl_interface input_device_interface = {
  24         "input_device", 1,
  25         ARRAY_LENGTH(input_device_methods),
  26         input_device_methods,
  27 };
  28
  29 static void wl_input_device_data(int fd, uint32_t mask, void *data)
  30 {
  31         struct wl_input_device *device = data;
  32         struct input_event ev[8], *e, *end;
  33         int len, value, dx, dy, absolute_event;
  34
  35         dx = 0;
  36         dy = 0;
  37         absolute_event = 0;
  38
  39         len = read(fd, &ev, sizeof ev);
  40         if (len < 0 || len % sizeof e[0] != 0) {
  41                 /* FIXME: handle error... reopen device? */;
  42                 return;
  43         }
  44
  45         e = ev;
  46         end = (void *) ev + len;
  47         for (e = ev; e < end; e++) {
  48                 /* Get the signed value, earlier kernels had this as unsigned */
  49                 value = e->value;
  50
  51                 switch (e->type) {
  52                 case EV_REL:
  53                         switch (e->code) {
  54                         case REL_X:
  55                                 dx += value;
  56                                 break;
  57
  58                         case REL_Y:
  59                                 dy += value;
  60                                 break;
  61                         }
  62                         break;
  63
  64                 case EV_ABS:
  65                         absolute_event = 1;
  66                         switch (e->code) {
  67                         case ABS_X:
  68                                 device->x = value;
  69                                 break;
  70                         case ABS_Y:
  71                                 device->y = value;
  72                                 break;
  73                         }
  74                         break;
  75
  76                 case EV_KEY:
  77                         if (value == 2)
  78                                 break;
  79
  80                         switch (e->code) {
  81                         case BTN_TOUCH:
  82                         case BTN_TOOL_PEN:
  83                         case BTN_TOOL_RUBBER:
  84                         case BTN_TOOL_BRUSH:
  85                         case BTN_TOOL_PENCIL:
  86                         case BTN_TOOL_AIRBRUSH:
  87                         case BTN_TOOL_FINGER:
  88                         case BTN_TOOL_MOUSE:
  89                         case BTN_TOOL_LENS:
  90                                 device->tool = value ? e->code : 0;
  91                                 break;
  92
  93                         case BTN_LEFT:
  94                                 wl_display_post_button_event(device->display,
  95                                                              &device->base, 0, value);
  96                                 break;
  97
  98                         case BTN_RIGHT:
  99                                 wl_display_post_button_event(device->display,
 100                                                              &device->base, 2, value);
 101                                 break;
 102
 103                         case BTN_MIDDLE:
 104                                 wl_display_post_button_event(device->display,
 105                                                              &device->base, 1, value);
 106                                 break;
 107                         }
 108                 }
 109         }
 110
 111         if (dx != 0 || dy != 0)
 112                 wl_display_post_relative_event(device->display,
 113                                                &device->base, dx, dy);
 114         if (absolute_event && device->tool)
 115                 wl_display_post_absolute_event(device->display,
 116                                                &device->base,
 117                                                device->x, device->y);
 118 }
 119
 120 struct wl_object *
 121 wl_input_device_create(struct wl_display *display,
 122                        const char *path, uint32_t id)
 123 {
 124         struct wl_input_device *device;
 125         struct wl_event_loop *loop;
 126
 127         device = malloc(sizeof *device);
 128         if (device == NULL)
 129                 return NULL;
 130
 131         device->base.interface = &input_device_interface;
 132         device->display = display;
 133         device->tool = 1;
 134
 135         device->fd = open(path, O_RDONLY);
 136         if (device->fd < 0) {
 137                 free(device);
 138                 fprintf(stderr, "couldn't create pointer for %s: %m\n", path);
 139                 return NULL;
 140         }
 141
 142         loop = wl_display_get_event_loop(display);
 143         device->source = wl_event_loop_add_fd(loop, device->fd,
 144                                               WL_EVENT_READABLE,
 145                                               wl_input_device_data, device);
 146         if (device->source == NULL) {
 147                 close(device->fd);
 148                 free(device);
 149                 return NULL;
 150         }
 151
 152         return &device->base;
 153 }