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 <[EMAIL PROTECTED]>
---
 Makefile               |    2 +
 README                 |    9 ++
 drivers/gpio/Makefile  |   47 ++++++++++
 drivers/gpio/pca953x.c |  218 ++++++++++++++++++++++++++++++++++++++++++++++++
 include/gpio/pca953x.h |   39 +++++++++
 5 files changed, 315 insertions(+), 0 deletions(-)
 create mode 100644 drivers/gpio/Makefile
 create mode 100644 drivers/gpio/pca953x.c
 create mode 100644 include/gpio/pca953x.h

diff --git a/Makefile b/Makefile
index fd521b6..0c5dd61 100644
--- a/Makefile
+++ b/Makefile
@@ -221,6 +221,7 @@ LIBS += disk/libdisk.a
 LIBS += drivers/bios_emulator/libatibiosemu.a
 LIBS += drivers/block/libblock.a
 LIBS += drivers/dma/libdma.a
+LIBS += drivers/gpio/libgpio.a
 LIBS += drivers/hwmon/libhwmon.a
 LIBS += drivers/i2c/libi2c.a
 LIBS += drivers/input/libinput.a
@@ -396,6 +397,7 @@ TAG_SUBDIRS += disk
 TAG_SUBDIRS += common
 TAG_SUBDIRS += drivers/bios_emulator
 TAG_SUBDIRS += drivers/block
+TAG_SUBDIRS += drivers/gpio
 TAG_SUBDIRS += drivers/hwmon
 TAG_SUBDIRS += drivers/i2c
 TAG_SUBDIRS += drivers/input
diff --git a/README b/README
index 9455fa7..bca8061 100644
--- a/README
+++ b/README
@@ -603,6 +603,8 @@ The following options need to be configured:
                CONFIG_CMD_MII          * MII utility commands
                CONFIG_CMD_NAND         * NAND support
                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_PCMCIA               * PCMCIA support
                CONFIG_CMD_PING         * send ICMP ECHO_REQUEST to network
@@ -680,6 +682,13 @@ The following options need to be configured:
                Note that if the RTC uses I2C, then the I2C interface
                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:
 
                When CONFIG_TIMESTAMP is selected, the timestamp
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
new file mode 100644
index 0000000..dd618ed
--- /dev/null
+++ b/drivers/gpio/Makefile
@@ -0,0 +1,47 @@
+#
+# Copyright 2000-2008
+# Wolfgang Denk, DENX Software Engineering, [EMAIL PROTECTED]
+#
+# 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
+
+########################################################################
diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
new file mode 100644
index 0000000..f52e559
--- /dev/null
+++ b/drivers/gpio/pca953x.c
@@ -0,0 +1,218 @@
+/*
+ * 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 <gpio/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");
+
+       i2c_read(chip, PCA953X_CONF, 1, &data, 1);
+       printf("conf:      ");
+       for (i = 7; i >= 0; i--)
+               printf("%c", data & (1 << i) ? 'i' : 'o');
+       printf("\n");
+
+       i2c_read(chip, PCA953X_POL, 1, &data, 1);
+       printf("invert:    ");
+       for (i = 7; i >= 0; i--)
+               printf("%c", data & (1 << i) ? '1' : '0');
+       printf("\n");
+
+       i2c_read(chip, PCA953X_IN, 1, &data, 1);
+       printf("input:     ");
+       for (i = 7; i >= 0; i--)
+               printf("%c", data & (1 << i) ? '1' : '0');
+       printf("\n");
+
+       i2c_read(chip, PCA953X_OUT, 1, &data, 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 */
+
+/* Use 'maxargs' field as minimum number of args to ease error checking  */
+cmd_tbl_t cmd_pca953x[] = {
+       U_BOOT_CMD_MKENT(device, 2, 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;
+       ulong ul_arg3;
+       cmd_tbl_t *c;
+
+       c = find_cmd_tbl(argv[1], cmd_pca953x, ARRAY_SIZE(cmd_pca953x));
+       if (!c || (argc < c->maxargs)) {
+               printf("Usage:\n%s\n", cmdtp->usage);
+               return 1;
+       }
+
+       /* arg2 used as chip number or pin number */
+       ul_arg2 = simple_strtoul(argv[2], NULL, 16);
+
+       /* arg3 used as pin or invert value */
+       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:
+               printf("Usage:\n%s\n", cmdtp->usage);
+               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 */
diff --git a/include/gpio/pca953x.h b/include/gpio/pca953x.h
new file mode 100644
index 0000000..6c2b58c
--- /dev/null
+++ b/include/gpio/pca953x.h
@@ -0,0 +1,39 @@
+/*
+ * 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_ */
-- 
1.6.0.2.GIT

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