diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/pca9505.c | 166 | ||||
| -rw-r--r-- | drivers/gpio/pca9505.h | 67 |
2 files changed, 233 insertions, 0 deletions
diff --git a/drivers/gpio/pca9505.c b/drivers/gpio/pca9505.c new file mode 100644 index 0000000000..5803746c96 --- /dev/null +++ b/drivers/gpio/pca9505.c @@ -0,0 +1,166 @@ +// Copyright 2022 nirim000 +// SPDX-License-Identifier: GPL-2.0-or-later + +#include "i2c_master.h" +#include "pca9505.h" + +#include "debug.h" + +#define SLAVE_TO_ADDR(n) (n << 1) +#define TIMEOUT 100 + +enum { + CMD_INPUT_0 = 0, + CMD_INPUT_1, + CMD_INPUT_2, + CMD_INPUT_3, + CMD_INPUT_4, + CMD_OUTPUT_0 = 8, + CMD_OUTPUT_1, + CMD_OUTPUT_2, + CMD_OUTPUT_3, + CMD_OUTPUT_4, + CMD_INVERSION_0 = 16, + CMD_INVERSION_1, + CMD_INVERSION_2, + CMD_INVERSION_3, + CMD_INVERSION_4, + CMD_CONFIG_0 = 24, + CMD_CONFIG_1, + CMD_CONFIG_2, + CMD_CONFIG_3, + CMD_CONFIG_4, +}; + +void pca9505_init(uint8_t slave_addr) { + static uint8_t s_init = 0; + if (!s_init) { + i2c_init(); + + s_init = 1; + } + + // TODO: could check device connected + // i2c_start(SLAVE_TO_ADDR(slave) | I2C_WRITE); + // i2c_stop(); +} + +bool pca9505_set_config(uint8_t slave_addr, pca9505_port_t port, uint8_t conf) { + uint8_t addr = SLAVE_TO_ADDR(slave_addr); + uint8_t cmd = 0; + switch (port) { + case 0: + cmd = CMD_CONFIG_0; + break; + case 1: + cmd = CMD_CONFIG_1; + break; + case 2: + cmd = CMD_CONFIG_2; + break; + case 3: + cmd = CMD_CONFIG_3; + break; + case 4: + cmd = CMD_CONFIG_4; + break; + } + + i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT); + if (ret != I2C_STATUS_SUCCESS) { + print("pca9505_set_config::FAILED\n"); + return false; + } + + return true; +} + +bool pca9505_set_polarity(uint8_t slave_addr, pca9505_port_t port, uint8_t conf) { + uint8_t addr = SLAVE_TO_ADDR(slave_addr); + uint8_t cmd = 0; + switch (port) { + case 0: + cmd = CMD_INVERSION_0; + break; + case 1: + cmd = CMD_INVERSION_1; + break; + case 2: + cmd = CMD_INVERSION_2; + break; + case 3: + cmd = CMD_INVERSION_3; + break; + case 4: + cmd = CMD_INVERSION_4; + break; + } + + i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT); + if (ret != I2C_STATUS_SUCCESS) { + print("pca9505_set_polarity::FAILED\n"); + return false; + } + + return true; +} + +bool pca9505_set_output(uint8_t slave_addr, pca9505_port_t port, uint8_t conf) { + uint8_t addr = SLAVE_TO_ADDR(slave_addr); + uint8_t cmd = 0; + switch (port) { + case 0: + cmd = CMD_OUTPUT_0; + break; + case 1: + cmd = CMD_OUTPUT_1; + break; + case 2: + cmd = CMD_OUTPUT_2; + break; + case 3: + cmd = CMD_OUTPUT_3; + break; + case 4: + cmd = CMD_OUTPUT_4; + break; + } + + i2c_status_t ret = i2c_writeReg(addr, cmd, &conf, sizeof(conf), TIMEOUT); + if (ret != I2C_STATUS_SUCCESS) { + print("pca9505_set_output::FAILED\n"); + return false; + } + + return true; +} + +bool pca9505_readPins(uint8_t slave_addr, pca9505_port_t port, uint8_t* out) { + uint8_t addr = SLAVE_TO_ADDR(slave_addr); + uint8_t cmd = 0; + switch (port) { + case 0: + cmd = CMD_INPUT_0; + break; + case 1: + cmd = CMD_INPUT_1; + break; + case 2: + cmd = CMD_INPUT_2; + break; + case 3: + cmd = CMD_INPUT_3; + break; + case 4: + cmd = CMD_INPUT_4; + break; + } + + i2c_status_t ret = i2c_readReg(addr, cmd, out, sizeof(uint8_t), TIMEOUT); + if (ret != I2C_STATUS_SUCCESS) { + print("pca9505_readPins::FAILED\n"); + return false; + } + + return true; +} diff --git a/drivers/gpio/pca9505.h b/drivers/gpio/pca9505.h new file mode 100644 index 0000000000..732ddb88ea --- /dev/null +++ b/drivers/gpio/pca9505.h @@ -0,0 +1,67 @@ +// Copyright 2022 nirim000 +// SPDX-License-Identifier: GPL-2.0-or-later + +#pragma once + +#include <stdint.h> +#include <stdbool.h> + +/** + * Port ID + */ +typedef enum { + PCA9505_PORT0, + PCA9505_PORT1, + PCA9505_PORT2, + PCA9505_PORT3, + PCA9505_PORT4, +} pca9505_port_t; + +/** + * Helpers for set_config + */ +enum { + ALL_NORMAL = 0, + ALL_INVERTED = 0xFF, +}; + +/** + * Helpers for set_config + */ +enum { + ALL_OUTPUT = 0, + ALL_INPUT = 0xFF, +}; + +/** + * Helpers for set_output + */ +enum { + ALL_LOW = 0, + ALL_HIGH = 0xFF, +}; + +/** + * Init expander and any other dependent drivers + */ +void pca9505_init(uint8_t slave_addr); + +/** + * Configure input/output to a given port + */ +bool pca9505_set_config(uint8_t slave_addr, pca9505_port_t port, uint8_t conf); + +/** + * Configure polarity to a given port + */ +bool pca9505_set_polarity(uint8_t slave_addr, pca9505_port_t port, uint8_t conf); + +/** + * Write high/low to a given port + */ +bool pca9505_set_output(uint8_t slave_addr, pca9505_port_t port, uint8_t conf); + +/** + * Read state of a given port + */ +bool pca9505_readPins(uint8_t slave_addr, pca9505_port_t port, uint8_t* ret); |