firmware/drivers/tsc200x.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2009 by Jonas Aaberg, Rob Purchase
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "tsc200x.h"
  23 #include "cpu.h"
  24 #include "i2c.h"
  25
  26 #define TSC_SLAVE_ADDR 0x90
  27 #define TSC_REG_READ_X 0x80
  28 #define TSC_REG_READ_Y 0x90
  29
  30 #ifdef COWON_D2
  31 #define TSCPRES_GPIO     GPIOC
  32 #define TSCPRES_GPIO_DIR GPIOC_DIR
  33 #define TSCPRES_BIT      (1<<26)
  34 #endif
  35
  36 void tsc200x_init(void)
  37 {
  38     /* Configure GPIOC 26 (TSC pressed) for input */
  39     TSCPRES_GPIO_DIR &= ~TSCPRES_BIT;
  40 }
  41
  42 bool tsc200x_is_pressed(void)
  43 {
  44     return !(TSCPRES_GPIO & TSCPRES_BIT);
  45 }
  46
  47 bool tsc200x_read_coords(short* x, short* y)
  48 {
  49     int rc = 0;
  50     unsigned char x_val[2], y_val[2];
  51
  52     rc |= i2c_readmem(TSC_SLAVE_ADDR, TSC_REG_READ_Y, y_val, 2);
  53     rc |= i2c_readmem(TSC_SLAVE_ADDR, TSC_REG_READ_X, x_val, 2);
  54
  55     if (rc >= 0)
  56     {
  57         /* Keep the 10 most significant bits */
  58         *x = ((((short)x_val[0]) << 8) | x_val[1]) >> 6;
  59         *y = ((((short)y_val[0]) << 8) | y_val[1]) >> 6;
  60         return true;
  61     }
  62
  63     return false;
  64 }