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/* u-boot driver for the TSC2007 connected to I2C2
*
* Copyright (C) 2010 by Golden Delicious Computers GmbH&Co. KG
* Author: H. Nikolaus Schaller <hns@goldelico.com>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <asm/errno.h>
#include <asm/io.h>
#include <asm/arch/mux.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/gpio.h>
#include <asm/mach-types.h>
#include <i2c.h>
#include "tsc2007.h"
#define TSC2007_BUS 2 // I2C2
#define TSC2007_ADDRESS 0x48
// command byte definitions:
// channel selection and power down
#define TSC2007_TEMP0 0x00
#define TSC2007_AUX 0x20
#define TSC2007_TEMP1 0x40
#define TSC2007_ACTX 0x80
#define TSC2007_ACTY 0x90
#define TSC2007_ACTXY 0xA0
#define TSC2007_X 0xc0
#define TSC2007_Y 0xd0
#define TSC2007_Z1 0xe0
#define TSC2007_Z2 0xf0
#define TSC2007_POWER_DOWN 0x00 // must be sent once after power up
#define TSC2007_ADC_ON 0x04
#define TSC2007_ADC_OFF_PENIRQ 0x08
#define TSC2007_12Bit2MHz 0x00
#define TSC2007_8Bit4MHz 0x02
// setup command
#define TSC2007_SETUP 0xb0
#define TSC2007_USE_MAV 0x00
#define TSC2007_BYPASS_MAV 0x02
#define TSC2007_50kPUP 0x00
#define TSC2007_90kPUP 0x01
/*
int i2c_read(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
int i2c_write(u_int8_t chip, u_int32_t addr, int alen, u_int8_t *buf, int len)
*/
int tsc2007_cmd(int cmd)
{ // send command
unsigned char buf[16];
buf[0]=cmd;
if (i2c_write(TSC2007_ADDRESS, cmd, 1, buf, 0)) // write 1 byte command
{
printf ("Error writing the TSC.\n");
return 1;
}
return 0;
}
int tsc2007_init(void)
{
int rc=0;
if(i2c_set_bus_num(TSC2007_BUS-1))
{
printf ("could not select I2C2\n");
return 1;
}
rc = tsc2007_cmd(TSC2007_SETUP|TSC2007_USE_MAV|TSC2007_50kPUP);
rc |= tsc2007_cmd(TSC2007_POWER_DOWN);
if(rc)
printf("did tsc2007_init() failed.\n");
else
printf("did tsc2007_init()\n");
return 0;
}
int read_adc(int adcnum)
{ // read ADC and return value in range 0..4095
unsigned char c;
unsigned char buf[16];
static int cmd[]={
TSC2007_X,
TSC2007_Y,
TSC2007_Z1,
TSC2007_Z2,
TSC2007_TEMP0,
TSC2007_TEMP1,
TSC2007_AUX,
TSC2007_AUX
};
c=cmd[adcnum%8] | TSC2007_ADC_ON | TSC2007_12Bit2MHz;
// printf("send %02x\n", c);
if (i2c_read(TSC2007_ADDRESS, c, 1, buf, 1))
{
printf ("Error reading the TSC.\n");
return -1;
}
return ((unsigned)buf[0]) << 4; // read 1 byte only
// return (buf[0]<<4)+(buf[1]>>4); // 12 bit
}
void print_adc(void)
{
printf("0:%04u 1:%04u 2:%04u 3:%04u 4:%04u 5:%04u 6:%04u 7:%04u",
read_adc(0),
read_adc(1),
read_adc(2),
read_adc(3),
read_adc(4),
read_adc(5),
read_adc(6),
read_adc(7));
}
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