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: Peter Tyser <ptyser@xes-inc.com>
This commit is contained in:
Peter Tyser
Andrew Fleming-AFLEMING
parent
7a89795911
commit
e92739d34e
2
Makefile
2
Makefile
@ -228,6 +228,7 @@ LIBS += drivers/bios_emulator/libatibiosemu.a
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LIBS += drivers/block/libblock.a
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LIBS += drivers/dma/libdma.a
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LIBS += drivers/fpga/libfpga.a
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LIBS += drivers/gpio/libgpio.a
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LIBS += drivers/hwmon/libhwmon.a
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LIBS += drivers/i2c/libi2c.a
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LIBS += drivers/input/libinput.a
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@ -407,6 +408,7 @@ TAG_SUBDIRS += disk
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TAG_SUBDIRS += common
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TAG_SUBDIRS += drivers/bios_emulator
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TAG_SUBDIRS += drivers/block
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TAG_SUBDIRS += drivers/gpio
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TAG_SUBDIRS += drivers/hwmon
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TAG_SUBDIRS += drivers/i2c
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TAG_SUBDIRS += drivers/input
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9
README
9
README
@ -621,6 +621,8 @@ The following options need to be configured:
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CONFIG_CMD_MII * MII utility commands
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CONFIG_CMD_NAND * NAND support
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CONFIG_CMD_NET bootp, tftpboot, rarpboot
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CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
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CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
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CONFIG_CMD_PCI * pciinfo
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CONFIG_CMD_PCMCIA * PCMCIA support
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CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
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@ -698,6 +700,13 @@ The following options need to be configured:
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Note that if the RTC uses I2C, then the I2C interface
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must also be configured. See I2C Support, below.
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- GPIO Support:
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CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
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CONFIG_PCA953X_INFO - enable pca953x info command
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Note that if the GPIO device uses I2C, then the I2C interface
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must also be configured. See I2C Support, below.
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- Timestamp Support:
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When CONFIG_TIMESTAMP is selected, the timestamp
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47
drivers/gpio/Makefile
Normal file
47
drivers/gpio/Makefile
Normal file
@ -0,0 +1,47 @@
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#
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# Copyright 2000-2008
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# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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#
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# See file CREDITS for list of people who contributed to this
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# project.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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#
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include $(TOPDIR)/config.mk
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LIB := $(obj)libgpio.a
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COBJS-$(CONFIG_PCA953X) += pca953x.o
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COBJS := $(COBJS-y)
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SRCS := $(COBJS:.o=.c)
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OBJS := $(addprefix $(obj),$(COBJS))
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all: $(LIB)
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$(LIB): $(obj).depend $(OBJS)
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$(AR) $(ARFLAGS) $@ $(OBJS)
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#########################################################################
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# defines $(obj).depend target
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include $(SRCTREE)/rules.mk
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sinclude $(obj).depend
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########################################################################
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227
drivers/gpio/pca953x.c
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227
drivers/gpio/pca953x.c
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@ -0,0 +1,227 @@
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/*
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* Copyright 2008 Extreme Engineering Solutions, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* Version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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/*
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* Driver for NXP's 4 and 8 bit I2C gpio expanders (eg pca9537, pca9557, etc)
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* TODO: support additional devices with more than 8-bits GPIO
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*/
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#include <common.h>
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#include <i2c.h>
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#include <pca953x.h>
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/* Default to an address that hopefully won't corrupt other i2c devices */
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#ifndef CONFIG_SYS_I2C_PCA953X_ADDR
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#define CONFIG_SYS_I2C_PCA953X_ADDR (~0)
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#endif
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enum {
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PCA953X_CMD_INFO,
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PCA953X_CMD_DEVICE,
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PCA953X_CMD_OUTPUT,
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PCA953X_CMD_INPUT,
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PCA953X_CMD_INVERT,
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};
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/*
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* Modify masked bits in register
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*/
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static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data)
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{
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uint8_t val;
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if (i2c_read(chip, addr, 1, &val, 1))
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return -1;
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val &= ~mask;
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val |= data;
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return i2c_write(chip, addr, 1, &val, 1);
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}
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/*
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* Set output value of IO pins in 'mask' to corresponding value in 'data'
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* 0 = low, 1 = high
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*/
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int pca953x_set_val(uint8_t chip, uint mask, uint data)
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{
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return pca953x_reg_write(chip, PCA953X_OUT, mask, data);
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}
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/*
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* Set read polarity of IO pins in 'mask' to corresponding value in 'data'
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* 0 = read pin value, 1 = read inverted pin value
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*/
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int pca953x_set_pol(uint8_t chip, uint mask, uint data)
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{
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return pca953x_reg_write(chip, PCA953X_POL, mask, data);
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}
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/*
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* Set direction of IO pins in 'mask' to corresponding value in 'data'
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* 0 = output, 1 = input
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*/
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int pca953x_set_dir(uint8_t chip, uint mask, uint data)
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{
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return pca953x_reg_write(chip, PCA953X_CONF, mask, data);
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}
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/*
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* Read current logic level of all IO pins
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*/
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int pca953x_get_val(uint8_t chip)
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{
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uint8_t val;
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if (i2c_read(chip, 0, 1, &val, 1))
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return -1;
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return (int)val;
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}
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#ifdef CONFIG_CMD_PCA953X
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#ifdef CONFIG_CMD_PCA953X_INFO
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/*
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* Display pca953x information
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*/
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static int pca953x_info(uint8_t chip)
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{
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int i;
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uint8_t data;
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printf("pca953x@ 0x%x:\n\n", chip);
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printf("gpio pins: 76543210\n");
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printf("-------------------\n");
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if (i2c_read(chip, PCA953X_CONF, 1, &data, 1))
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return -1;
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printf("conf: ");
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for (i = 7; i >= 0; i--)
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printf("%c", data & (1 << i) ? 'i' : 'o');
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printf("\n");
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if (i2c_read(chip, PCA953X_POL, 1, &data, 1))
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return -1;
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printf("invert: ");
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for (i = 7; i >= 0; i--)
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printf("%c", data & (1 << i) ? '1' : '0');
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printf("\n");
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if (i2c_read(chip, PCA953X_IN, 1, &data, 1))
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return -1;
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printf("input: ");
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for (i = 7; i >= 0; i--)
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printf("%c", data & (1 << i) ? '1' : '0');
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printf("\n");
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if (i2c_read(chip, PCA953X_OUT, 1, &data, 1))
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return -1;
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printf("output: ");
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for (i = 7; i >= 0; i--)
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printf("%c", data & (1 << i) ? '1' : '0');
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printf("\n");
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return 0;
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}
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#endif /* CONFIG_CMD_PCA953X_INFO */
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cmd_tbl_t cmd_pca953x[] = {
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U_BOOT_CMD_MKENT(device, 3, 0, (void *)PCA953X_CMD_DEVICE, "", ""),
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U_BOOT_CMD_MKENT(output, 4, 0, (void *)PCA953X_CMD_OUTPUT, "", ""),
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U_BOOT_CMD_MKENT(input, 3, 0, (void *)PCA953X_CMD_INPUT, "", ""),
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U_BOOT_CMD_MKENT(invert, 4, 0, (void *)PCA953X_CMD_INVERT, "", ""),
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#ifdef CONFIG_CMD_PCA953X_INFO
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U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""),
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#endif
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};
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int do_pca953x(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
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{
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static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
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int val;
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ulong ul_arg2 = 0;
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ulong ul_arg3 = 0;
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cmd_tbl_t *c;
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c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x));
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/* All commands but "device" require 'maxargs' arguments */
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if (!c || !((argc == (c->maxargs)) ||
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(((int)c->cmd == PCA953X_CMD_DEVICE) &&
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(argc == (c->maxargs - 1))))) {
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printf("Usage:\n%s\n", cmdtp->usage);
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return 1;
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}
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/* arg2 used as chip number or pin number */
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if (argc > 2)
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ul_arg2 = simple_strtoul(argv[2], NULL, 16);
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/* arg3 used as pin or invert value */
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if (argc > 3)
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ul_arg3 = simple_strtoul(argv[3], NULL, 16) & 0x1;
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switch ((int)c->cmd) {
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#ifdef CONFIG_CMD_PCA953X_INFO
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case PCA953X_CMD_INFO:
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return pca953x_info(chip);
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#endif
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case PCA953X_CMD_DEVICE:
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if (argc == 3)
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chip = (uint8_t)ul_arg2;
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printf("Current device address: 0x%x\n", chip);
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return 0;
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case PCA953X_CMD_INPUT:
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pca953x_set_dir(chip, (1 << ul_arg2),
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PCA953X_DIR_IN << ul_arg2);
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val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0;
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printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, val);
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return val;
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case PCA953X_CMD_OUTPUT:
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pca953x_set_dir(chip, (1 << ul_arg2),
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(PCA953X_DIR_OUT << ul_arg2));
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return pca953x_set_val(chip, (1 << ul_arg2),
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(ul_arg3 << ul_arg2));
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case PCA953X_CMD_INVERT:
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return pca953x_set_pol(chip, (1 << ul_arg2),
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(ul_arg3 << ul_arg2));
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default:
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/* We should never get here */
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return 1;
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}
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}
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U_BOOT_CMD(
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pca953x, 5, 1, do_pca953x,
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"pca953x - pca953x gpio access\n",
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"device [dev]\n"
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" - show or set current device address\n"
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#ifdef CONFIG_CMD_PCA953X_INFO
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"pca953x info\n"
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" - display info for current chip\n"
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#endif
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"pca953x output pin 0|1\n"
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" - set pin as output and drive low or high\n"
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"pca953x invert pin 0|1\n"
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" - disable/enable polarity inversion for reads\n"
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"pca953x intput pin\n"
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" - set pin as input and read value\n"
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);
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#endif /* CONFIG_CMD_PCA953X */
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39
include/pca953x.h
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39
include/pca953x.h
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@ -0,0 +1,39 @@
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/*
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* Copyright 2008 Extreme Engineering Solutions, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* Version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __PCA953X_H_
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#define __PCA953X_H_
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#define PCA953X_IN 0x00
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#define PCA953X_OUT 0x01
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#define PCA953X_POL 0x02
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#define PCA953X_CONF 0x03
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#define PCA953X_OUT_LOW 0
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#define PCA953X_OUT_HIGH 1
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#define PCA953X_POL_NORMAL 0
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#define PCA953X_POL_INVERT 1
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#define PCA953X_DIR_OUT 0
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#define PCA953X_DIR_IN 1
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int pca953x_set_val(u8 chip, uint mask, uint data);
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int pca953x_set_pol(u8 chip, uint mask, uint data);
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int pca953x_set_dir(u8 chip, uint mask, uint data);
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int pca953x_get_val(u8 chip);
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#endif /* __PCA953X_H_ */
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