--- /dev/null
+/*
+ * 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 */
--- /dev/null
+/*
+ * 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_ */
projects / u-boot / commitdiff