diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/gpio/pca953x.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/gpio/pca953x.c | 312 |
1 files changed, 0 insertions, 312 deletions
diff --git a/qemu/roms/u-boot/drivers/gpio/pca953x.c b/qemu/roms/u-boot/drivers/gpio/pca953x.c deleted file mode 100644 index 7371cd4a8..000000000 --- a/qemu/roms/u-boot/drivers/gpio/pca953x.c +++ /dev/null @@ -1,312 +0,0 @@ -/* - * 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, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557, - * pca9539, etc) - */ - -#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, -}; - -#ifdef CONFIG_SYS_I2C_PCA953X_WIDTH -struct pca953x_chip_ngpio { - uint8_t chip; - uint8_t ngpio; -}; - -static struct pca953x_chip_ngpio pca953x_chip_ngpios[] = - CONFIG_SYS_I2C_PCA953X_WIDTH; - -/* - * Determine the number of GPIO pins supported. If we don't know we assume - * 8 pins. - */ -static int pca953x_ngpio(uint8_t chip) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(pca953x_chip_ngpios); i++) - if (pca953x_chip_ngpios[i].chip == chip) - return pca953x_chip_ngpios[i].ngpio; - - return 8; -} -#else -static int pca953x_ngpio(uint8_t chip) -{ - return 8; -} -#endif - -/* - * Modify masked bits in register - */ -static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data) -{ - uint8_t valb; - uint16_t valw; - - if (pca953x_ngpio(chip) <= 8) { - if (i2c_read(chip, addr, 1, &valb, 1)) - return -1; - - valb &= ~mask; - valb |= data; - - return i2c_write(chip, addr, 1, &valb, 1); - } else { - if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2)) - return -1; - - valw &= ~mask; - valw |= data; - - return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2); - } -} - -static int pca953x_reg_read(uint8_t chip, uint addr, uint *data) -{ - uint8_t valb; - uint16_t valw; - - if (pca953x_ngpio(chip) <= 8) { - if (i2c_read(chip, addr, 1, &valb, 1)) - return -1; - *data = (int)valb; - } else { - if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2)) - return -1; - *data = (int)valw; - } - return 0; -} - -/* - * 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) -{ - uint val; - - if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0) - 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; - uint data; - int nr_gpio = pca953x_ngpio(chip); - int msb = nr_gpio - 1; - - printf("pca953x@ 0x%x (%d pins):\n\n", chip, nr_gpio); - printf("gpio pins: "); - for (i = msb; i >= 0; i--) - printf("%x", i); - printf("\n"); - for (i = 11 + nr_gpio; i > 0; i--) - printf("-"); - printf("\n"); - - if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0) - return -1; - printf("conf: "); - for (i = msb; i >= 0; i--) - printf("%c", data & (1 << i) ? 'i' : 'o'); - printf("\n"); - - if (pca953x_reg_read(chip, PCA953X_POL, &data) < 0) - return -1; - printf("invert: "); - for (i = msb; i >= 0; i--) - printf("%c", data & (1 << i) ? '1' : '0'); - printf("\n"); - - if (pca953x_reg_read(chip, PCA953X_IN, &data) < 0) - return -1; - printf("input: "); - for (i = msb; i >= 0; i--) - printf("%c", data & (1 << i) ? '1' : '0'); - printf("\n"); - - if (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0) - return -1; - printf("output: "); - for (i = msb; 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 * const argv[]) -{ - static uint8_t chip = CONFIG_SYS_I2C_PCA953X_ADDR; - int ret = CMD_RET_USAGE, 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))))) { - return CMD_RET_USAGE; - } - - /* 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: - ret = pca953x_info(chip); - if (ret) - ret = CMD_RET_FAILURE; - break; -#endif - - case PCA953X_CMD_DEVICE: - if (argc == 3) - chip = (uint8_t)ul_arg2; - printf("Current device address: 0x%x\n", chip); - ret = CMD_RET_SUCCESS; - break; - - case PCA953X_CMD_INPUT: - ret = pca953x_set_dir(chip, (1 << ul_arg2), - PCA953X_DIR_IN << ul_arg2); - val = (pca953x_get_val(chip) & (1 << ul_arg2)) != 0; - - if (ret) - ret = CMD_RET_FAILURE; - else - printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, - val); - break; - - case PCA953X_CMD_OUTPUT: - ret = pca953x_set_dir(chip, (1 << ul_arg2), - (PCA953X_DIR_OUT << ul_arg2)); - if (!ret) - ret = pca953x_set_val(chip, (1 << ul_arg2), - (ul_arg3 << ul_arg2)); - if (ret) - ret = CMD_RET_FAILURE; - break; - - case PCA953X_CMD_INVERT: - ret = pca953x_set_pol(chip, (1 << ul_arg2), - (ul_arg3 << ul_arg2)); - if (ret) - ret = CMD_RET_FAILURE; - break; - } - - if (ret == CMD_RET_FAILURE) - eprintf("Error talking to chip at 0x%x\n", chip); - - return ret; -} - -U_BOOT_CMD( - pca953x, 5, 1, do_pca953x, - "pca953x gpio access", - "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 input pin\n" - " - set pin as input and read value" -); - -#endif /* CONFIG_CMD_PCA953X */ |