kernel/input.c

   1 /*
   2  * mahatma - a simple kernel framework
   3  * Copyright (c) 2008, 2009 Daniel Mack <daniel@caiaq.de>
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /* wikilib and guilib includes */
  20 #include <guilib.h>
  21 #include <wikilib.h>
  22 #include <input.h>
  23 #include <malloc.h>
  24
  25 /* local includes */
  26 #include "types.h"
  27 #include "regs.h"
  28 #include "wikireader.h"
  29 #include "misc.h"
  30 #include "tff.h"
  31 #include "serial.h"
  32 #include "suspend.h"
  33 #include "touchscreen.h"
  34 #include "gpio.h"
  35 #include "input.h"
  36
  37 int wl_input_wait(struct wl_input_event *ev, int sleep)
  38 {
  39         /* wl_input_wait() is called from the wikilib mainloop and we will
  40          * get here regularily when the system has no other duty. Hence,
  41          * the only thing we want to do here is go to sleep - the interrupt
  42          * sources are set up and will bring us back to life at some point
  43          */
  44
  45         while (1) {
  46                 if (serial_get_event(ev))
  47                         break;
  48
  49                 if (touchscreen_get_event(ev))
  50                         break;
  51
  52                 if (gpio_get_event(ev))
  53                         break;
  54
  55                 /* no power saving return */
  56                 if (!sleep) {
  57                         ev->type = -1;
  58                         break;
  59                 }
  60
  61                 /* we only go to a power saving halt mode if there is no
  62                  * messages pending */
  63                 if (!serial_output_pending()) {
  64                         system_suspend();
  65                 }
  66
  67         }
  68
  69         return 0;
  70 }
  71