/* * 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 */