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65cc0e2a65
The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do not easily transition to Kconfig. In many cases they likely should come from the device tree instead. Move these out of CONFIG namespace and in to CFG namespace. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
295 lines
6.4 KiB
C
295 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2008 Extreme Engineering Solutions, Inc.
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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 <command.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 CFG_SYS_I2C_PCA953X_ADDR
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#define CFG_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 CFG_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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CFG_SYS_I2C_PCA953X_WIDTH;
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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 < ARRAY_SIZE(pca953x_chip_ngpios); 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 = le16_to_cpu(valw);
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valw &= ~mask;
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valw |= data;
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valw = cpu_to_le16(valw);
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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 = (uint)le16_to_cpu(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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#if defined(CONFIG_CMD_PCA953X) && !defined(CONFIG_SPL_BUILD)
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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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static struct cmd_tbl 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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U_BOOT_CMD_MKENT(info, 2, 0, (void *)PCA953X_CMD_INFO, "", ""),
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};
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static int do_pca953x(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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static uint8_t chip = CFG_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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struct cmd_tbl *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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(((long)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 = hextoul(argv[2], NULL);
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/* arg3 used as pin or invert value */
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if (argc > 3)
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ul_arg3 = hextoul(argv[3], NULL) & 0x1;
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switch ((long)c->cmd) {
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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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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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"pca953x info\n"
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" - display info for current chip\n"
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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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