Commit e92739d3 authored by Peter Tyser's avatar Peter Tyser Committed by Andrew Fleming-AFLEMING
Browse files

Add support for PCA953x I2C gpio devices



Initial support for NXP's 4 and 8 bit I2C gpio expanders
(eg pca9537, pca9557, etc). The CONFIG_PCA953X define
enables support for the devices while the CONFIG_CMD_PCA953X
define enables the pca953x command. The CONFIG_CMD_PCA953X_INFO
define enables an 'info' sub-command which provides summary
information for the given pca953x device.
Signed-off-by: default avatarPeter Tyser <ptyser@xes-inc.com>
parent 7a897959
...@@ -228,6 +228,7 @@ LIBS += drivers/bios_emulator/libatibiosemu.a ...@@ -228,6 +228,7 @@ LIBS += drivers/bios_emulator/libatibiosemu.a
LIBS += drivers/block/libblock.a LIBS += drivers/block/libblock.a
LIBS += drivers/dma/libdma.a LIBS += drivers/dma/libdma.a
LIBS += drivers/fpga/libfpga.a LIBS += drivers/fpga/libfpga.a
LIBS += drivers/gpio/libgpio.a
LIBS += drivers/hwmon/libhwmon.a LIBS += drivers/hwmon/libhwmon.a
LIBS += drivers/i2c/libi2c.a LIBS += drivers/i2c/libi2c.a
LIBS += drivers/input/libinput.a LIBS += drivers/input/libinput.a
...@@ -407,6 +408,7 @@ TAG_SUBDIRS += disk ...@@ -407,6 +408,7 @@ TAG_SUBDIRS += disk
TAG_SUBDIRS += common TAG_SUBDIRS += common
TAG_SUBDIRS += drivers/bios_emulator TAG_SUBDIRS += drivers/bios_emulator
TAG_SUBDIRS += drivers/block TAG_SUBDIRS += drivers/block
TAG_SUBDIRS += drivers/gpio
TAG_SUBDIRS += drivers/hwmon TAG_SUBDIRS += drivers/hwmon
TAG_SUBDIRS += drivers/i2c TAG_SUBDIRS += drivers/i2c
TAG_SUBDIRS += drivers/input TAG_SUBDIRS += drivers/input
......
...@@ -621,6 +621,8 @@ The following options need to be configured: ...@@ -621,6 +621,8 @@ The following options need to be configured:
CONFIG_CMD_MII * MII utility commands CONFIG_CMD_MII * MII utility commands
CONFIG_CMD_NAND * NAND support CONFIG_CMD_NAND * NAND support
CONFIG_CMD_NET bootp, tftpboot, rarpboot CONFIG_CMD_NET bootp, tftpboot, rarpboot
CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
CONFIG_CMD_PCI * pciinfo CONFIG_CMD_PCI * pciinfo
CONFIG_CMD_PCMCIA * PCMCIA support CONFIG_CMD_PCMCIA * PCMCIA support
CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
...@@ -698,6 +700,13 @@ The following options need to be configured: ...@@ -698,6 +700,13 @@ The following options need to be configured:
Note that if the RTC uses I2C, then the I2C interface Note that if the RTC uses I2C, then the I2C interface
must also be configured. See I2C Support, below. must also be configured. See I2C Support, below.
- GPIO Support:
CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
CONFIG_PCA953X_INFO - enable pca953x info command
Note that if the GPIO device uses I2C, then the I2C interface
must also be configured. See I2C Support, below.
- Timestamp Support: - Timestamp Support:
When CONFIG_TIMESTAMP is selected, the timestamp When CONFIG_TIMESTAMP is selected, the timestamp
......
#
# Copyright 2000-2008
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# 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 $(TOPDIR)/config.mk
LIB := $(obj)libgpio.a
COBJS-$(CONFIG_PCA953X) += pca953x.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
all: $(LIB)
$(LIB): $(obj).depend $(OBJS)
$(AR) $(ARFLAGS) $@ $(OBJS)
#########################################################################
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
sinclude $(obj).depend
########################################################################
/*
* Copyright 2008 Extreme Engineering Solutions, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*
* 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
*/
/*
* Driver for NXP's 4 and 8 bit I2C gpio expanders (eg pca9537, pca9557, etc)
* TODO: support additional devices with more than 8-bits GPIO
*/
#include <common.h>
#include <i2c.h>
#include <pca953x.h>
/* Default to an address that hopefully won't corrupt other i2c devices */
#ifndef CONFIG_SYS_I2C_PCA953X_ADDR
#define CONFIG_SYS_I2C_PCA953X_ADDR (~0)
#endif
enum {
PCA953X_CMD_INFO,
PCA953X_CMD_DEVICE,
PCA953X_CMD_OUTPUT,
PCA953X_CMD_INPUT,
PCA953X_CMD_INVERT,
};
/*
* Modify masked bits in register
*/
static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data)
{
uint8_t val;
if (i2c_read(chip, addr, 1, &val, 1))
return -1;
val &= ~mask;
val |= data;
return i2c_write(chip, addr, 1, &val, 1);
}
/*
* Set output value of IO pins in 'mask' to corresponding value in 'data'
* 0 = low, 1 = high
*/
int pca953x_set_val(uint8_t chip, uint mask, uint data)
{
return pca953x_reg_write(chip, PCA953X_OUT, mask, data);
}
/*
* Set read polarity of IO pins in 'mask' to corresponding value in 'data'
* 0 = read pin value, 1 = read inverted pin value
*/
int pca953x_set_pol(uint8_t chip, uint mask, uint data)
{
return pca953x_reg_write(chip, PCA953X_POL, mask, data);
}
/*
* Set direction of IO pins in 'mask' to corresponding value in 'data'
* 0 = output, 1 = input
*/
int pca953x_set_dir(uint8_t chip, uint mask, uint data)
{
return pca953x_reg_write(chip, PCA953X_CONF, mask, data);
}
/*
* Read current logic level of all IO pins
*/
int pca953x_get_val(uint8_t chip)
{
uint8_t val;
if (i2c_read(chip, 0, 1, &val, 1))
return -1;
return (int)val;
}
#ifdef CONFIG_CMD_PCA953X
#ifdef CONFIG_CMD_PCA953X_INFO
/*
* Display pca953x information
*/
static int pca953x_info(uint8_t chip)
{
int i;
uint8_t data;
printf("pca953x@ 0x%x:\n\n", chip);
printf("gpio pins: 76543210\n");
printf("-------------------\n");
if (i2c_read(chip, PCA953X_CONF, 1, &data, 1))
return -1;
printf("conf: ");
for (i = 7; i >= 0; i--)
printf("%c", data & (1 << i) ? 'i' : 'o');
printf("\n");
if (i2c_read(chip, PCA953X_POL, 1, &data, 1))
return -1;
printf("invert: ");
for (i = 7; i >= 0; i--)
printf("%c", data & (1 << i) ? '1' : '0');
printf("\n");
if (i2c_read(chip, PCA953X_IN, 1, &data, 1))
return -1;
printf("input: ");
for (i = 7; i >= 0; i--)
printf("%c", data & (1 << i) ? '1' : '0');
printf("\n");
if (i2c_read(chip, PCA953X_OUT, 1, &data, 1))
return -1;
printf("output: ");
for (i = 7; i >= 0; i--)
printf("%c", data & (1 << i) ? '1' : '0');
printf("\n");
return 0;
}
#endif /* CONFIG_CMD_PCA953X_INFO */
cmd_tbl_t cmd_pca953x[] = {
U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""),
U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""),
U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""),
U_BOOT_CMD_MKENT(invert, 4, 0, (void *)PCA953X_CMD_INVERT, "", ""),
#ifdef CONFIG_CMD_PCA953X_INFO
U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""),
#endif
};
int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
int val;
ulong ul_arg2 = 0;
ulong ul_arg3 = 0;
cmd_tbl_t *c;
c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x));
/* All commands but "device" require 'maxargs' arguments */
if (!c || !((argc == (c->maxargs)) ||
(((int)c->cmd == PCA953X_CMD_DEVICE) &&
(argc == (c->maxargs - 1))))) {
printf("Usage:\n%s\n", cmdtp->usage);
return 1;
}
/* arg2 used as chip number or pin number */
if (argc > 2)
ul_arg2 = simple_strtoul(argv[2], NULL, 16);
/* arg3 used as pin or invert value */
if (argc > 3)
ul_arg3 = simple_strtoul(argv[3], NULL, 16) & 0x1;
switch ((int)c->cmd) {
#ifdef CONFIG_CMD_PCA953X_INFO
case PCA953X_CMD_INFO:
return pca953x_info(chip);
#endif
case PCA953X_CMD_DEVICE:
if (argc == 3)
chip = (uint8_t)ul_arg2;
printf("Current device address: 0x%x\n", chip);
return 0;
case PCA953X_CMD_INPUT:
pca953x_set_dir(chip, (1 << ul_arg2),
PCA953X_DIR_IN << ul_arg2);
val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0;
printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, val);
return val;
case PCA953X_CMD_OUTPUT:
pca953x_set_dir(chip, (1 << ul_arg2),
(PCA953X_DIR_OUT << ul_arg2));
return pca953x_set_val(chip, (1 << ul_arg2),
(ul_arg3 << ul_arg2));
case PCA953X_CMD_INVERT:
return pca953x_set_pol(chip, (1 << ul_arg2),
(ul_arg3 << ul_arg2));
default:
/* We should never get here */
return 1;
}
}
U_BOOT_CMD(
pca953x, 5, 1, do_pca953x,
"pca953x - pca953x gpio access\n",
"device [dev]\n"
" - show or set current device address\n"
#ifdef CONFIG_CMD_PCA953X_INFO
"pca953x info\n"
" - display info for current chip\n"
#endif
"pca953x output pin 0|1\n"
" - set pin as output and drive low or high\n"
"pca953x invert pin 0|1\n"
" - disable/enable polarity inversion for reads\n"
"pca953x intput pin\n"
" - set pin as input and read value\n"
);
#endif /* CONFIG_CMD_PCA953X */
/*
* Copyright 2008 Extreme Engineering Solutions, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*
* 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
*/
#ifndef __PCA953X_H_
#define __PCA953X_H_
#define PCA953X_IN 0x00
#define PCA953X_OUT 0x01
#define PCA953X_POL 0x02
#define PCA953X_CONF 0x03
#define PCA953X_OUT_LOW 0
#define PCA953X_OUT_HIGH 1
#define PCA953X_POL_NORMAL 0
#define PCA953X_POL_INVERT 1
#define PCA953X_DIR_OUT 0
#define PCA953X_DIR_IN 1
int pca953x_set_val(u8 chip, uint mask, uint data);
int pca953x_set_pol(u8 chip, uint mask, uint data);
int pca953x_set_dir(u8 chip, uint mask, uint data);
int pca953x_get_val(u8 chip);
#endif /* __PCA953X_H_ */
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