Add the tca642x gpio expander driver Datasheet: http://www.ti.com/product/tca6424a Signed-off-by: Dan Murphy <dmurphy@ti.com>master
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/*
|
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* Copyright 2013 Texas Instruments, Inc. |
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* Author: Dan Murphy <dmurphy@ti.com> |
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* |
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* Derived work from the pca953x.c driver |
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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 as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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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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#include <common.h> |
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#include <i2c.h> |
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#include <tca642x.h> |
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/* tca642x register address definitions */ |
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struct tca642x_bank_info tca642x_regs[] = { |
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{ .input_reg = 0x00, |
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.output_reg = 0x04, |
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.polarity_reg = 0x08, |
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.configuration_reg = 0x0c }, |
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{ .input_reg = 0x01, |
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.output_reg = 0x05, |
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.polarity_reg = 0x09, |
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.configuration_reg = 0x0d }, |
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{ .input_reg = 0x02, |
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.output_reg = 0x06, |
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.polarity_reg = 0x0a, |
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.configuration_reg = 0x0e }, |
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}; |
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/*
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* Modify masked bits in register |
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*/ |
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static int tca642x_reg_write(uchar chip, uint8_t addr, |
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uint8_t reg_bit, uint8_t data) |
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{ |
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uint8_t valw; |
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int org_bus_num; |
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int ret; |
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org_bus_num = i2c_get_bus_num(); |
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i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); |
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if (i2c_read(chip, addr, 1, (uint8_t *)&valw, 1)) { |
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printf("Could not read before writing\n"); |
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ret = -1; |
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goto error; |
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} |
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valw &= ~reg_bit; |
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valw |= data; |
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ret = i2c_write(chip, addr, 1, (u8 *)&valw, 1); |
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error: |
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i2c_set_bus_num(org_bus_num); |
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return ret; |
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} |
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static int tca642x_reg_read(uchar chip, uint8_t addr, uint8_t *data) |
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{ |
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uint8_t valw; |
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int org_bus_num; |
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int ret = 0; |
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org_bus_num = i2c_get_bus_num(); |
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i2c_set_bus_num(CONFIG_SYS_I2C_TCA642X_BUS_NUM); |
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if (i2c_read(chip, addr, 1, (u8 *)&valw, 1)) { |
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ret = -1; |
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goto error; |
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} |
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*data = valw; |
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error: |
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i2c_set_bus_num(org_bus_num); |
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return ret; |
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} |
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/*
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* Set output value of IO pins in 'reg_bit' to corresponding value in 'data' |
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* 0 = low, 1 = high |
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*/ |
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int tca642x_set_val(uchar chip, uint8_t gpio_bank, |
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uint8_t reg_bit, uint8_t data) |
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{ |
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uint8_t out_reg = tca642x_regs[gpio_bank].output_reg; |
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return tca642x_reg_write(chip, out_reg, reg_bit, data); |
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} |
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/*
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* Set read polarity of IO pins in 'reg_bit' 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 tca642x_set_pol(uchar chip, uint8_t gpio_bank, |
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uint8_t reg_bit, uint8_t data) |
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{ |
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uint8_t pol_reg = tca642x_regs[gpio_bank].polarity_reg; |
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return tca642x_reg_write(chip, pol_reg, reg_bit, data); |
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} |
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/*
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* Set direction of IO pins in 'reg_bit' to corresponding value in 'data' |
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* 0 = output, 1 = input |
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*/ |
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int tca642x_set_dir(uchar chip, uint8_t gpio_bank, |
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uint8_t reg_bit, uint8_t data) |
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{ |
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uint8_t config_reg = tca642x_regs[gpio_bank].configuration_reg; |
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return tca642x_reg_write(chip, config_reg, reg_bit, 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 tca642x_get_val(uchar chip, uint8_t gpio_bank) |
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{ |
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uint8_t val; |
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uint8_t in_reg = tca642x_regs[gpio_bank].input_reg; |
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if (tca642x_reg_read(chip, in_reg, &val) < 0) |
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return -1; |
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return (int)val; |
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} |
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/*
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* Set the inital register states for the tca642x gpio expander |
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*/ |
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int tca642x_set_inital_state(uchar chip, struct tca642x_bank_info init_data[]) |
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{ |
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int i, ret; |
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uint8_t config_reg; |
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uint8_t polarity_reg; |
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uint8_t output_reg; |
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for (i = 0; i < 3; i++) { |
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config_reg = tca642x_regs[i].configuration_reg; |
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ret = tca642x_reg_write(chip, config_reg, 0xff, |
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init_data[i].configuration_reg); |
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polarity_reg = tca642x_regs[i].polarity_reg; |
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ret = tca642x_reg_write(chip, polarity_reg, 0xff, |
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init_data[i].polarity_reg); |
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output_reg = tca642x_regs[i].output_reg; |
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ret = tca642x_reg_write(chip, output_reg, 0xff, |
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init_data[i].output_reg); |
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} |
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return ret; |
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} |
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#ifdef CONFIG_CMD_TCA642X |
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/*
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* Display tca642x information |
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*/ |
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static int tca642x_info(uchar chip) |
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{ |
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int i, j; |
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uint8_t data; |
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printf("tca642x@ 0x%x (%d pins):\n", chip, 24); |
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for (i = 0; i < 3; i++) { |
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printf("Bank %i\n", i); |
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if (tca642x_reg_read(chip, |
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tca642x_regs[i].configuration_reg, |
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&data) < 0) |
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return -1; |
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printf("\tConfiguration: "); |
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for (j = 7; j >= 0; j--) |
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printf("%c", data & (1 << j) ? 'i' : 'o'); |
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printf("\n"); |
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if (tca642x_reg_read(chip, |
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tca642x_regs[i].polarity_reg, &data) < 0) |
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return -1; |
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printf("\tPolarity: "); |
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for (j = 7; j >= 0; j--) |
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printf("%c", data & (1 << j) ? '1' : '0'); |
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printf("\n"); |
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if (tca642x_reg_read(chip, |
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tca642x_regs[i].input_reg, &data) < 0) |
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return -1; |
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printf("\tInput value: "); |
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for (j = 7; j >= 0; j--) |
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printf("%c", data & (1 << j) ? '1' : '0'); |
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printf("\n"); |
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if (tca642x_reg_read(chip, |
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tca642x_regs[i].output_reg, &data) < 0) |
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return -1; |
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printf("\tOutput value: "); |
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for (j = 7; j >= 0; j--) |
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printf("%c", data & (1 << j) ? '1' : '0'); |
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printf("\n"); |
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} |
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return 0; |
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} |
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cmd_tbl_t cmd_tca642x[] = { |
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U_BOOT_CMD_MKENT(device, 3, 0, (void *)TCA642X_CMD_DEVICE, "", ""), |
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U_BOOT_CMD_MKENT(output, 4, 0, (void *)TCA642X_CMD_OUTPUT, "", ""), |
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U_BOOT_CMD_MKENT(input, 3, 0, (void *)TCA642X_CMD_INPUT, "", ""), |
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U_BOOT_CMD_MKENT(invert, 4, 0, (void *)TCA642X_CMD_INVERT, "", ""), |
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U_BOOT_CMD_MKENT(info, 2, 0, (void *)TCA642X_CMD_INFO, "", ""), |
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}; |
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int do_tca642x(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) |
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{ |
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static uchar chip = CONFIG_SYS_I2C_TCA642X_ADDR; |
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int ret = CMD_RET_USAGE, val; |
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uint8_t gpio_bank = 0; |
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uint8_t bank_shift; |
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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_tca642x, ARRAY_SIZE(cmd_tca642x)); |
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/* All commands but "device" require 'maxargs' arguments */ |
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if (!c || |
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!((argc == (c->maxargs)) || |
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(((int)c->cmd == TCA642X_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, 10); |
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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, 10) & 0x1; |
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if (ul_arg2 <= 7) { |
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gpio_bank = 0; |
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} else if ((ul_arg2 >= 10) && (ul_arg2 <= 17)) { |
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gpio_bank = 1; |
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} else if ((ul_arg2 >= 20) && (ul_arg2 <= 27)) { |
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gpio_bank = 2; |
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} else { |
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printf("Requested pin is not available\n"); |
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ret = CMD_RET_FAILURE; |
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goto error; |
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} |
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} |
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switch ((int)c->cmd) { |
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case TCA642X_CMD_INFO: |
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ret = tca642x_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 TCA642X_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 TCA642X_CMD_INPUT: |
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bank_shift = ul_arg2 - (gpio_bank * 10); |
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ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), |
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TCA642X_DIR_IN << bank_shift); |
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val = (tca642x_get_val(chip, gpio_bank) & |
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(1 << bank_shift)) != 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, |
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ul_arg2, val); |
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break; |
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case TCA642X_CMD_OUTPUT: |
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bank_shift = ul_arg2 - (gpio_bank * 10); |
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ret = tca642x_set_dir(chip, gpio_bank, (1 << bank_shift), |
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(TCA642X_DIR_OUT << bank_shift)); |
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if (!ret) |
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ret = tca642x_set_val(chip, |
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gpio_bank, (1 << bank_shift), |
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(ul_arg3 << bank_shift)); |
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if (ret) |
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ret = CMD_RET_FAILURE; |
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break; |
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case TCA642X_CMD_INVERT: |
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bank_shift = ul_arg2 - (gpio_bank * 10); |
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ret = tca642x_set_pol(chip, gpio_bank, (1 << bank_shift), |
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(ul_arg3 << bank_shift)); |
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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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error: |
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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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tca642x, 5, 1, do_tca642x, |
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"tca642x gpio access", |
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"device [dev]\n" |
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" - show or set current device address\n" |
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"tca642x info\n" |
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" - display info for current chip\n" |
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"tca642x output pin 0|1\n" |
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" - set pin as output and drive low or high\n" |
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"tca642x invert pin 0|1\n" |
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" - disable/enable polarity inversion for reads\n" |
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"tca642x 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_TCA642X */ |
@ -0,0 +1,69 @@ |
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/*
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* Copyright 2013 Texas Instruments, Inc. |
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* Author: Dan Murphy <dmurphy@ti.com> |
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* |
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* Derived work from the pca953x.c driver |
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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 as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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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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#ifndef __TCA642X_H_ |
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#define __TCA642X_H_ |
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#ifdef CONFIG_CMD_TCA642X |
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enum { |
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TCA642X_CMD_INFO, |
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TCA642X_CMD_DEVICE, |
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TCA642X_CMD_OUTPUT, |
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TCA642X_CMD_INPUT, |
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TCA642X_CMD_INVERT, |
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}; |
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#endif |
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#define TCA642X_OUT_LOW 0 |
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#define TCA642X_OUT_HIGH 1 |
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#define TCA642X_POL_NORMAL 0 |
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#define TCA642X_POL_INVERT 1 |
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#define TCA642X_DIR_OUT 0 |
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#define TCA642X_DIR_IN 1 |
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/* Default to an address that hopefully won't corrupt other i2c devices */ |
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#ifndef CONFIG_SYS_I2C_TCA642X_ADDR |
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#define CONFIG_SYS_I2C_TCA642X_ADDR (~0) |
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#endif |
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/* Default to an address that hopefully won't corrupt other i2c devices */ |
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#ifndef CONFIG_SYS_I2C_TCA642X_BUS_NUM |
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#define CONFIG_SYS_I2C_TCA642X_BUS_NUM (0) |
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#endif |
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struct tca642x_bank_info { |
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uint8_t input_reg; |
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uint8_t output_reg; |
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uint8_t polarity_reg; |
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uint8_t configuration_reg; |
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}; |
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int tca642x_set_val(uchar chip, uint8_t gpio_bank, |
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uint8_t reg_bit, uint8_t data); |
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int tca642x_set_pol(uchar chip, uint8_t gpio_bank, |
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uint8_t reg_bit, uint8_t data); |
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int tca642x_set_dir(uchar chip, uint8_t gpio_bank, |
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uint8_t reg_bit, uint8_t data); |
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int tca642x_get_val(uchar chip, uint8_t gpio_bank); |
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int tca642x_set_inital_state(uchar chip, struct tca642x_bank_info init_data[]); |
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#endif /* __TCA642X_H_ */ |
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