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633efe9c23
Use the standard CMD_RET_* constants to clearly report errors from the pca953x command. In addition, print error messages when I2C communication fails. Signed-off-by: Laurence Withers <lwithers@guralp.com>
315 lines
7.2 KiB
C
315 lines
7.2 KiB
C
/*
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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, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557,
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* pca9539, etc)
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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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#ifdef CONFIG_SYS_I2C_PCA953X_WIDTH
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struct pca953x_chip_ngpio {
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uint8_t chip;
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uint8_t ngpio;
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};
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static struct pca953x_chip_ngpio pca953x_chip_ngpios[] =
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CONFIG_SYS_I2C_PCA953X_WIDTH;
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#define NUM_CHIP_GPIOS (sizeof(pca953x_chip_ngpios) / \
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sizeof(struct pca953x_chip_ngpio))
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/*
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* Determine the number of GPIO pins supported. If we don't know we assume
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* 8 pins.
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*/
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static int pca953x_ngpio(uint8_t chip)
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{
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int i;
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for (i = 0; i < NUM_CHIP_GPIOS; i++)
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if (pca953x_chip_ngpios[i].chip == chip)
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return pca953x_chip_ngpios[i].ngpio;
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return 8;
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}
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#else
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static int pca953x_ngpio(uint8_t chip)
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{
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return 8;
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}
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#endif
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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 valb;
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uint16_t valw;
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if (pca953x_ngpio(chip) <= 8) {
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if (i2c_read(chip, addr, 1, &valb, 1))
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return -1;
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valb &= ~mask;
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valb |= data;
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return i2c_write(chip, addr, 1, &valb, 1);
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} else {
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if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
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return -1;
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valw &= ~mask;
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valw |= data;
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return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2);
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}
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}
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static int pca953x_reg_read(uint8_t chip, uint addr, uint *data)
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{
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uint8_t valb;
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uint16_t valw;
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if (pca953x_ngpio(chip) <= 8) {
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if (i2c_read(chip, addr, 1, &valb, 1))
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return -1;
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*data = (int)valb;
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} else {
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if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
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return -1;
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*data = (int)valw;
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}
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return 0;
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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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uint val;
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if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0)
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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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uint data;
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int nr_gpio = pca953x_ngpio(chip);
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int msb = nr_gpio - 1;
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printf("pca953x@ 0x%x (%d pins):\n\n", chip, nr_gpio);
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printf("gpio pins: ");
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for (i = msb; i >= 0; i--)
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printf("%x", i);
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printf("\n");
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for (i = 11 + nr_gpio; i > 0; i--)
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printf("-");
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printf("\n");
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if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0)
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return -1;
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printf("conf: ");
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for (i = msb; 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 (pca953x_reg_read(chip, PCA953X_POL, &data) < 0)
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return -1;
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printf("invert: ");
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for (i = msb; 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 (pca953x_reg_read(chip, PCA953X_IN, &data) < 0)
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return -1;
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printf("input: ");
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for (i = msb; 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 (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0)
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return -1;
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printf("output: ");
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for (i = msb; 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 * const argv[])
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{
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static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR;
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int ret = CMD_RET_USAGE, 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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return CMD_RET_USAGE;
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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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ret = pca953x_info(chip);
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if (ret)
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ret = CMD_RET_FAILURE;
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break;
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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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ret = CMD_RET_SUCCESS;
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break;
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case PCA953X_CMD_INPUT:
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ret = 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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if (ret)
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ret = CMD_RET_FAILURE;
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else
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printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2,
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val);
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break;
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case PCA953X_CMD_OUTPUT:
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ret = pca953x_set_dir(chip, (1 << ul_arg2),
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(PCA953X_DIR_OUT << ul_arg2));
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if (!ret)
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ret = pca953x_set_val(chip, (1 << ul_arg2),
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(ul_arg3 << ul_arg2));
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if (ret)
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ret = CMD_RET_FAILURE;
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break;
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case PCA953X_CMD_INVERT:
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ret = pca953x_set_pol(chip, (1 << ul_arg2),
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(ul_arg3 << ul_arg2));
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if (ret)
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ret = CMD_RET_FAILURE;
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break;
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}
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if (ret == CMD_RET_FAILURE)
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eprintf("Error talking to chip at 0x%x\n", chip);
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return ret;
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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 gpio access",
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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 input pin\n"
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" - set pin as input and read value"
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);
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#endif /* CONFIG_CMD_PCA953X */
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