Add the tca642x gpio expander driver
Signed-off-by: Dan Murphy dmurphy@ti.com --- drivers/gpio/Makefile | 1 + drivers/gpio/tca642x.c | 312 ++++++++++++++++++++++++++++++++++++++++++++++++ include/tca642x.h | 64 ++++++++++ 3 files changed, 377 insertions(+) create mode 100644 drivers/gpio/tca642x.c create mode 100644 include/tca642x.h
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index f77c1ec..7e74dfe 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -49,6 +49,7 @@ COBJS-$(CONFIG_BCM2835_GPIO) += bcm2835_gpio.o COBJS-$(CONFIG_S3C2440_GPIO) += s3c2440_gpio.o COBJS-$(CONFIG_XILINX_GPIO) += xilinx_gpio.o COBJS-$(CONFIG_ADI_GPIO2) += adi_gpio2.o +COBJS-$(CONFIG_TCA642X) += tca642x.o
COBJS := $(COBJS-y) SRCS := $(COBJS:.o=.c) diff --git a/drivers/gpio/tca642x.c b/drivers/gpio/tca642x.c new file mode 100644 index 0000000..740714d --- /dev/null +++ b/drivers/gpio/tca642x.c @@ -0,0 +1,312 @@ +/* + * Copyright 2013 Texas Instruments, Inc. + * + * Derived work from the pca953x.c driver + * + * 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 + */ + +#include <common.h> +#include <i2c.h> +#include <tca642x.h> + +/* tca642x register address definitions */ +struct tca642x_bank_info tca642x_banks[] = { + {0x00, 0x04, 0x08, 0x0c}, + {0x01, 0x05, 0x09, 0x0d}, + {0x02, 0x06, 0x0a, 0x0e}, +}; + +/* + * Modify masked bits in register + */ +static int tca642x_reg_write(uint8_t chip, uint addr, uint mask, uint data) +{ + uint16_t valw; + int org_bus_num; + int ret; + + org_bus_num = i2c_get_bus_num(); + i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); + + if (i2c_read(chip, addr, 1, (u8 *)&valw, 1)) { + printf("Could not read before writing\n"); + ret = -1; + goto error; + } + valw &= ~mask; + valw |= data; + + ret = i2c_write(chip, addr, 1, (u8 *)&valw, 1); + +error: + i2c_set_bus_num(org_bus_num); + return ret; + +} + +static int tca642x_reg_read(uint8_t chip, uint addr, uint *data) +{ + uint16_t valw; + int org_bus_num; + int ret = 0; + + org_bus_num = i2c_get_bus_num(); + i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); + if (i2c_read(chip, addr, 1, (u8 *)&valw, 1)) { + ret = -1; + goto error; + } + + *data = (int)valw; + +error: + i2c_set_bus_num(org_bus_num); + return ret; +} + +/* + * Set output value of IO pins in 'mask' to corresponding value in 'data' + * 0 = low, 1 = high + */ +int tca642x_set_val(uint8_t chip, u8 gpio_bank, uint mask, uint data) +{ + uint out_reg = tca642x_banks[gpio_bank].output_reg; + + return tca642x_reg_write(chip, out_reg, 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 tca642x_set_pol(uint8_t chip, u8 gpio_bank, uint mask, uint data) +{ + uint pol_reg = tca642x_banks[gpio_bank].polarity_reg; + + return tca642x_reg_write(chip, pol_reg, mask, data); +} + +/* + * Set direction of IO pins in 'mask' to corresponding value in 'data' + * 0 = output, 1 = input + */ +int tca642x_set_dir(uint8_t chip, u8 gpio_bank, uint mask, uint data) +{ + uint config_reg = tca642x_banks[gpio_bank].configuration_reg; + + return tca642x_reg_write(chip, config_reg, mask, data); +} + +/* + * Read current logic level of all IO pins + */ +int tca642x_get_val(uint8_t chip, u8 gpio_bank) +{ + uint val; + uint in_reg = tca642x_banks[gpio_bank].input_reg; + + if (tca642x_reg_read(chip, in_reg, &val) < 0) + return -1; + + return (int)val; +} + +/* + * Set the inital register states for the tca642x gpio expander + */ +int tca642x_set_inital_state(uint8_t chip, struct tca642x_bank_info init_data[]) +{ + int i, ret; + uint config_reg; + uint polarity_reg; + uint output_reg; + + for (i = 0; i < 3; i++) { + config_reg = tca642x_banks[i].configuration_reg; + ret = tca642x_reg_write(chip, config_reg, 0xff, + init_data[i].configuration_reg); + polarity_reg = tca642x_banks[i].polarity_reg; + ret = tca642x_reg_write(chip, polarity_reg, 0xff, + init_data[i].polarity_reg); + output_reg = tca642x_banks[i].output_reg; + ret = tca642x_reg_write(chip, output_reg, 0xff, + init_data[i].output_reg); + } + + return ret; +} + +#ifdef CONFIG_CMD_TCA642X +/* + * Display tca642x information + */ +static int tca642x_info(uint8_t chip) +{ + int i, j; + uint data; + + printf("tca642x@ 0x%x (%d pins):\n", chip, 24); + for (i = 0; i < 3; i++) { + printf("Bank %i\n", i); + if (tca642x_reg_read(chip, tca642x_banks[i].configuration_reg, &data) < 0) + return -1; + printf("\tConfiguration: "); + for (j = 7; j >= 0; j--) + printf("%c", data & (1 << j) ? 'i' : 'o'); + printf("\n"); + + if (tca642x_reg_read(chip, tca642x_banks[i].polarity_reg, &data) < 0) + return -1; + printf("\tPolarity: "); + for (j = 7; j >= 0; j--) + printf("%c", data & (1 << j) ? '1' : '0'); + printf("\n"); + + if (tca642x_reg_read(chip, tca642x_banks[i].input_reg, &data) < 0) + return -1; + printf("\tInput value: "); + for (j = 7; j >= 0; j--) + printf("%c", data & (1 << j) ? '1' : '0'); + printf("\n"); + + if (tca642x_reg_read(chip, tca642x_banks[i].output_reg, &data) < 0) + return -1; + printf("\tOutput value: "); + for (j = 7; j >= 0; j--) + printf("%c", data & (1 << j) ? '1' : '0'); + printf("\n"); + } + + return 0; +} + +cmd_tbl_t cmd_tca642x[] = { + U_BOOT_CMD_MKENT(device, 3, 0, (void *)TCA642X_CMD_DEVICE, "", ""), + U_BOOT_CMD_MKENT(output, 4, 0, (void *)TCA642X_CMD_OUTPUT, "", ""), + U_BOOT_CMD_MKENT(input, 3, 0, (void *)TCA642X_CMD_INPUT, "", ""), + U_BOOT_CMD_MKENT(invert, 4, 0, (void *)TCA642X_CMD_INVERT, "", ""), + U_BOOT_CMD_MKENT(info, 2, 0, (void *)TCA642X_CMD_INFO, "", ""), +}; + +int do_tca642x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + static uint8_t chip = CONFIG_SYS_I2C_TCA642X_ADDR; + int ret = CMD_RET_USAGE, val; + u8 gpio_bank; + u8 bank_shift; + ulong ul_arg2 = 0; + ulong ul_arg3 = 0; + cmd_tbl_t *c; + + c = find_cmd_tbl(argv[1], cmd_tca642x, ARRAY_SIZE(cmd_tca642x)); + + /* All commands but "device" require 'maxargs' arguments */ + if (!c || !((argc == (c->maxargs)) || + (((int)c->cmd == TCA642X_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, 10); + + /* arg3 used as pin or invert value */ + if (argc > 3) { + ul_arg3 = simple_strtoul(argv[3], NULL, 10) & 0x1; + if (ul_arg2 <= 7) + gpio_bank = 0; + else if ((ul_arg2 >= 10) && (ul_arg2 <= 17)) + gpio_bank = 1; + else if ((ul_arg2 >= 20) && (ul_arg2 <= 27)) + gpio_bank = 2; + else { + printf("Requested pin is not available\n"); + ret = CMD_RET_FAILURE; + goto error; + } + } + + switch ((int)c->cmd) { + case TCA642X_CMD_INFO: + ret = tca642x_info(chip); + if (ret) + ret = CMD_RET_FAILURE; + break; + + case TCA642X_CMD_DEVICE: + if (argc == 3) + chip = (uint8_t)ul_arg2; + printf("Current device address: 0x%x\n", chip); + ret = CMD_RET_SUCCESS; + break; + + case TCA642X_CMD_INPUT: + bank_shift = ul_arg2 - (gpio_bank * 10); + ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), + TCA642X_DIR_IN << bank_shift); + val = (tca642x_get_val(chip, gpio_bank) & (1 << bank_shift)) != 0; + + if (ret) + ret = CMD_RET_FAILURE; + else + printf("chip 0x%02x, pin 0x%lx = %d\n", chip, ul_arg2, + val); + break; + + case TCA642X_CMD_OUTPUT: + bank_shift = ul_arg2 - (gpio_bank * 10); + ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), + (TCA642X_DIR_OUT << bank_shift)); + if (!ret) + ret = tca642x_set_val(chip, gpio_bank, (1 << bank_shift), + (ul_arg3 << bank_shift)); + if (ret) + ret = CMD_RET_FAILURE; + break; + + case TCA642X_CMD_INVERT: + bank_shift = ul_arg2 - (gpio_bank * 10); + ret = tca642x_set_pol(chip, gpio_bank, (1 << bank_shift), + (ul_arg3 << bank_shift)); + if (ret) + ret = CMD_RET_FAILURE; + break; + + } +error: + if (ret == CMD_RET_FAILURE) + eprintf("Error talking to chip at 0x%x\n", chip); + + return ret; +} + +U_BOOT_CMD( + tca642x, 5, 1, do_tca642x, + "tca642x gpio access", + "device [dev]\n" + " - show or set current device address\n" + "tca642x info\n" + " - display info for current chip\n" + "tca642x output pin 0|1\n" + " - set pin as output and drive low or high\n" + "tca642x invert pin 0|1\n" + " - disable/enable polarity inversion for reads\n" + "tca642x input pin\n" + " - set pin as input and read value" +); + +#endif /* CONFIG_CMD_TCA642X */ diff --git a/include/tca642x.h b/include/tca642x.h new file mode 100644 index 0000000..2ca34a7 --- /dev/null +++ b/include/tca642x.h @@ -0,0 +1,64 @@ +/* + * Copyright 2013 Texas Instruments, Inc. + * + * Derived work from the pca953x.c driver + * + * 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 __TCA642X_H_ +#define __TCA642X_H_ + +#ifdef CONFIG_CMD_TCA642X +enum { + TCA642X_CMD_INFO, + TCA642X_CMD_DEVICE, + TCA642X_CMD_OUTPUT, + TCA642X_CMD_INPUT, + TCA642X_CMD_INVERT, +}; +#endif + +#define TCA642X_OUT_LOW 0 +#define TCA642X_OUT_HIGH 1 +#define TCA642X_POL_NORMAL 0 +#define TCA642X_POL_INVERT 1 +#define TCA642X_DIR_OUT 0 +#define TCA642X_DIR_IN 1 + +/* Default to an address that hopefully won't corrupt other i2c devices */ +#ifndef CONFIG_SYS_I2C_TCA642X_ADDR +#define CONFIG_SYS_I2C_TCA642X_ADDR (~0) +#endif + +/* Default to an address that hopefully won't corrupt other i2c devices */ +#ifndef CONFIG_SYS_I2C_TCA642X_BUS_NUM +#define CONFIG_SYS_I2C_TCA642X_BUS_NUM (0) +#endif + +struct tca642x_bank_info { + uint8_t input_reg; + uint8_t output_reg; + uint8_t polarity_reg; + uint8_t configuration_reg; +}; + +int tca642x_set_val(u8 chip, u8 gpio_bank, uint mask, uint data); +int tca642x_set_pol(u8 chip, u8 gpio_bank, uint mask, uint data); +int tca642x_set_dir(u8 chip, u8 gpio_bank, uint mask, uint data); +int tca642x_get_val(u8 chip, u8 gpio_bank); +int tca642x_set_inital_state(uint8_t chip, struct tca642x_bank_info init_data[]); + +#endif /* __TCA642X_H_ */