firmware/drivers/tsc2100.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id: $
   9  *
  10  * Copyright (C) 2007 by Jonathan Gordon
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #include "config.h"
  21 #include "cpu.h"
  22 #include "system.h"
  23 #include "spi.h"
  24 #include "tsc2100.h"
  25
  26 /* Read X, Y, Z1, Z2 touchscreen coordinates. */
  27 void tsc2100_read_values(short *x, short* y, short *z1, short *z2)
  28 {
  29     int page = 0, address = 0;
  30     unsigned short command = 0x8000|(page << 11)|(address << 5);
  31     unsigned char out[] = {command >> 8, command & 0xff};
  32     unsigned char in[8];
  33     spi_block_transfer(SPI_target_TSC2100,
  34                        out, sizeof(out), in, sizeof(in));
  35
  36     *x = (in[0]<<8)|in[1];
  37     *y = (in[2]<<8)|in[3];
  38     *z1 = (in[4]<<8)|in[5];
  39     *z2 = (in[6]<<8)|in[7];
  40 }
  41
  42 short tsc2100_readreg(int page, int address)
  43 {
  44     unsigned short command = 0x8000|(page << 11)|(address << 5);
  45     unsigned char out[] = {command >> 8, command & 0xff};
  46     unsigned char in[2];
  47     spi_block_transfer(SPI_target_TSC2100,
  48                        out, sizeof(out), in, sizeof(in));
  49     return (in[0]<<8)|in[1];
  50 }
  51
  52
  53 void tsc2100_writereg(int page, int address, short value)
  54 {
  55     unsigned short command = (page << 11)|(address << 5);
  56     unsigned char out[4] = {command >> 8, command & 0xff,
  57                             value >> 8,   value & 0xff};
  58     spi_block_transfer(SPI_target_TSC2100,
  59                        out, sizeof(out), NULL, 0);
  60 }
  61
  62 void tsc2100_keyclick(void)
  63 {
  64     // 1100 0100 0001 0000
  65     short val = 0xC410;
  66     tsc2100_writereg(TSAC2_PAGE, TSAC2_ADDRESS, tsc2100_readreg(TSAC2_PAGE, TSAC2_ADDRESS)&0x8000);
  67 }