blob: d5a125a531b1e33b9d357d68094e13dc7ae3f88d [file] [log] [blame]
/*
* Copyright (c) 2023 Ayush Singh <ayushdevel1325@gmail.com>
* Copyright (c) 2021 Jason Kridner, BeagleBoard.org Foundation
* Copyright (c) 2020 Innoseis BV
*
* Based on i2c_tca9656a.c
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT gpio_i2c_switch
#define GPIO_I2C_TOGGLE_DELAY_US 1
#define GPIO_I2C_LOCK_TIMEOUT_US (GPIO_I2C_TOGGLE_DELAY_US * 2 + 100)
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(gpio_i2c_switch, CONFIG_I2C_LOG_LEVEL);
struct gpio_i2c_switch_config {
const struct device *bus;
const struct gpio_dt_spec gpio;
};
struct gpio_i2c_switch_data {
struct k_mutex lock;
};
static int gpio_i2c_switch_configure(const struct device *dev, uint32_t dev_config)
{
const struct gpio_i2c_switch_config *config = dev->config;
return i2c_configure(config->bus, dev_config);
}
static int gpio_i2c_switch_transfer(const struct device *dev, struct i2c_msg *msgs,
uint8_t num_msgs, uint16_t addr)
{
int res;
struct gpio_i2c_switch_data *data = dev->data;
const struct gpio_i2c_switch_config *config = dev->config;
res = k_mutex_lock(&data->lock, K_USEC(GPIO_I2C_LOCK_TIMEOUT_US));
if (res != 0) {
return res;
}
/* enable switch */
gpio_pin_set_dt(&config->gpio, 1);
k_busy_wait(GPIO_I2C_TOGGLE_DELAY_US);
res = i2c_transfer(config->bus, msgs, num_msgs, addr);
/* disable switch */
gpio_pin_set_dt(&config->gpio, 0);
k_busy_wait(GPIO_I2C_TOGGLE_DELAY_US);
k_mutex_unlock(&data->lock);
return res;
}
static const struct i2c_driver_api gpio_i2c_switch_api_funcs = {
.configure = gpio_i2c_switch_configure,
.transfer = gpio_i2c_switch_transfer,
};
static int gpio_i2c_switch_init(const struct device *dev)
{
const struct gpio_i2c_switch_config *config = dev->config;
struct gpio_i2c_switch_data *data = dev->data;
k_mutex_init(&data->lock);
return gpio_pin_configure_dt(&config->gpio, GPIO_OUTPUT_INACTIVE);
}
#define DEFINE_GPIO_I2C_SWITCH(inst) \
\
static struct gpio_i2c_switch_data gpio_i2c_switch_dev_data_##inst; \
\
static const struct gpio_i2c_switch_config gpio_i2c_switch_dev_cfg_##inst = { \
.bus = DEVICE_DT_GET(DT_PHANDLE(DT_DRV_INST(inst), controller)), \
.gpio = GPIO_DT_SPEC_GET(DT_DRV_INST(inst), gpios), \
}; \
\
DEVICE_DT_INST_DEFINE(inst, gpio_i2c_switch_init, device_pm_control_nop, \
&gpio_i2c_switch_dev_data_##inst, &gpio_i2c_switch_dev_cfg_##inst, \
POST_KERNEL, CONFIG_I2C_INIT_PRIORITY, &gpio_i2c_switch_api_funcs);
DT_INST_FOREACH_STATUS_OKAY(DEFINE_GPIO_I2C_SWITCH)