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drivers: i2c: add gpio_i2c_switch

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Add drivers for gpio_i2c_switch which is present in beagleconnect freedom

Signed-off-by: Vaishnav Achath <vaishnav@beagleboard.org>
Signed-off-by: Ayush Singh <ayushdevel1325@gmail.com>
This commit is contained in:
Ayush Singh 2023-11-01 18:32:05 +05:30 committed by Carles Cufí
parent 2b98b67109
commit dfe1c3a32b
4 changed files with 104 additions and 1 deletions
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2
boards/arm/beagle_bcf/beagleconnect_freedom.dts
View file

@ -59,7 +59,7 @@
sens_i2c: sensor-switch {
status = "okay";
compatible = "ti,ts5a2066";
compatible = "gpio-i2c-switch";
#address-cells = <1>;
#size-cells = <0>;
controller = <&i2c0>;

1
drivers/i2c/CMakeLists.txt
View file

@ -54,6 +54,7 @@ zephyr_library_sources_ifdef(CONFIG_I2C_XILINX_AXI i2c_xilinx_axi.c)
zephyr_library_sources_ifdef(CONFIG_I2C_MCHP_MSS i2c_mchp_mss.c)
zephyr_library_sources_ifdef(CONFIG_I2C_SEDI i2c_sedi.c)
zephyr_library_sources_ifdef(CONFIG_I2C_AMBIQ i2c_ambiq.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_I2C_SWITCH gpio_i2c_switch.c)
zephyr_library_sources_ifdef(CONFIG_I2C_STM32_V1
i2c_ll_stm32_v1.c

7
drivers/i2c/Kconfig
View file

@ -195,4 +195,11 @@ config I2C_RV32M1_LPI2C
help
Enable the RV32M1 LPI2C driver.
config GPIO_I2C_SWITCH
bool "GPIO controlled I2C bus switch"
default y
depends on DT_HAS_GPIO_I2C_SWITCH_ENABLED
help
Enable GPIO controlled I2C bus switch driver.
endif # I2C

95
drivers/i2c/gpio_i2c_switch.c Normal file
View file

@ -0,0 +1,95 @@
/*
* 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_configure_dt(&config->gpio, GPIO_OUTPUT_HIGH);
k_busy_wait(GPIO_I2C_TOGGLE_DELAY_US);
res = i2c_transfer(config->bus, msgs, num_msgs, addr);
/* disable switch */
gpio_pin_configure_dt(&config->gpio, GPIO_OUTPUT_LOW);
k_busy_wait(GPIO_I2C_TOGGLE_DELAY_US);
k_mutex_unlock(&data->lock);
return res;
}
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_LOW);
}
#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)