258 lines
7.5 KiB
C
258 lines
7.5 KiB
C
/*
|
|
* Copyright (c) 2022 SILA Embedded Solutions GmbH
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#define DT_DRV_COMPAT rohm_bd8lb600fs
|
|
|
|
#include <errno.h>
|
|
|
|
#include <zephyr/kernel.h>
|
|
#include <zephyr/device.h>
|
|
#include <zephyr/init.h>
|
|
#include <zephyr/drivers/gpio.h>
|
|
#include <zephyr/drivers/gpio/gpio_utils.h>
|
|
#include <zephyr/drivers/spi.h>
|
|
#include <zephyr/logging/log.h>
|
|
#include <zephyr/sys/byteorder.h>
|
|
|
|
LOG_MODULE_REGISTER(gpio_bd8lb600fs, CONFIG_GPIO_LOG_LEVEL);
|
|
|
|
#define OUTPUT_OFF_WITH_OPEN_LOAD_DETECTION 0b11
|
|
#define OUTPUT_ON 0b10
|
|
#define WAIT_TIME_RESET_ACTIVE_IN_US 1000
|
|
#define WAIT_TIME_RESET_INACTIVE_TO_CS_IN_US 10
|
|
|
|
struct bd8lb600fs_config {
|
|
/* gpio_driver_config needs to be first */
|
|
struct gpio_driver_config common;
|
|
|
|
struct spi_dt_spec bus;
|
|
const struct gpio_dt_spec gpio_reset;
|
|
};
|
|
|
|
struct bd8lb600fs_drv_data {
|
|
/* gpio_driver_data needs to be first */
|
|
struct gpio_driver_data data;
|
|
uint8_t state; /* each bit is one output channel, bit 0 = channel 1, ... */
|
|
uint8_t configured; /* each bit defines if the output channel is configured, see state */
|
|
struct k_mutex lock;
|
|
};
|
|
|
|
static int write_state(const struct bd8lb600fs_config *config, uint8_t state)
|
|
{
|
|
LOG_DBG("writing state 0x%02X to BD8LB600FS", state);
|
|
|
|
uint16_t state_converted = 0;
|
|
uint8_t buffer_tx[2];
|
|
const struct spi_buf tx_buf[] = {{
|
|
.buf = buffer_tx,
|
|
.len = ARRAY_SIZE(buffer_tx),
|
|
}};
|
|
const struct spi_buf_set tx = {
|
|
.buffers = tx_buf,
|
|
.count = ARRAY_SIZE(tx_buf),
|
|
};
|
|
|
|
for (size_t i = 0; i < 8; ++i) {
|
|
if ((state & BIT(i)) == 0) {
|
|
state_converted |= OUTPUT_OFF_WITH_OPEN_LOAD_DETECTION << (i * 2);
|
|
} else {
|
|
state_converted |= OUTPUT_ON << (i * 2);
|
|
}
|
|
}
|
|
|
|
sys_put_be16(state_converted, buffer_tx);
|
|
|
|
int result = spi_write_dt(&config->bus, &tx);
|
|
|
|
if (result != 0) {
|
|
LOG_ERR("spi_write failed with error %i", result);
|
|
return result;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bd8lb600fs_pin_configure(const struct device *dev, gpio_pin_t pin, gpio_flags_t flags)
|
|
{
|
|
const struct bd8lb600fs_config *config = dev->config;
|
|
struct bd8lb600fs_drv_data *drv_data = dev->data;
|
|
|
|
/* cannot execute a bus operation in an ISR context */
|
|
if (k_is_in_isr()) {
|
|
return -EWOULDBLOCK;
|
|
}
|
|
|
|
if (pin > 7) {
|
|
LOG_ERR("invalid pin nummber %i", pin);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((flags & GPIO_INPUT) != 0) {
|
|
LOG_ERR("cannot configure pin as input");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if ((flags & GPIO_OUTPUT) == 0) {
|
|
LOG_ERR("pin must be configured as an output");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if ((flags & GPIO_SINGLE_ENDED) == 0) {
|
|
LOG_ERR("pin must be configured as single ended");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if ((flags & GPIO_LINE_OPEN_DRAIN) == 0) {
|
|
LOG_ERR("pin must be configured as open drain");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if ((flags & GPIO_PULL_UP) != 0) {
|
|
LOG_ERR("pin cannot have a pull up configured");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if ((flags & GPIO_PULL_DOWN) != 0) {
|
|
LOG_ERR("pin cannot have a pull down configured");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
k_mutex_lock(&drv_data->lock, K_FOREVER);
|
|
|
|
if ((flags & GPIO_OUTPUT_INIT_LOW) != 0) {
|
|
WRITE_BIT(drv_data->state, pin, 0);
|
|
} else if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0) {
|
|
WRITE_BIT(drv_data->state, pin, 1);
|
|
}
|
|
|
|
WRITE_BIT(drv_data->configured, pin, 1);
|
|
|
|
int result = write_state(config, drv_data->state);
|
|
|
|
k_mutex_unlock(&drv_data->lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int bd8lb600fs_port_get_raw(const struct device *dev, uint32_t *value)
|
|
{
|
|
LOG_ERR("input pins are not available");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
static int bd8lb600fs_port_set_masked_raw(const struct device *dev, uint32_t mask, uint32_t value)
|
|
{
|
|
const struct bd8lb600fs_config *config = dev->config;
|
|
struct bd8lb600fs_drv_data *drv_data = dev->data;
|
|
|
|
/* cannot execute a bus operation in an ISR context */
|
|
if (k_is_in_isr()) {
|
|
return -EWOULDBLOCK;
|
|
}
|
|
|
|
k_mutex_lock(&drv_data->lock, K_FOREVER);
|
|
drv_data->state = (drv_data->state & ~mask) | (mask & value);
|
|
|
|
int result = write_state(config, drv_data->state);
|
|
|
|
k_mutex_unlock(&drv_data->lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int bd8lb600fs_port_set_bits_raw(const struct device *dev, uint32_t mask)
|
|
{
|
|
return bd8lb600fs_port_set_masked_raw(dev, mask, mask);
|
|
}
|
|
|
|
static int bd8lb600fs_port_clear_bits_raw(const struct device *dev, uint32_t mask)
|
|
{
|
|
return bd8lb600fs_port_set_masked_raw(dev, mask, 0);
|
|
}
|
|
|
|
static int bd8lb600fs_port_toggle_bits(const struct device *dev, uint32_t mask)
|
|
{
|
|
const struct bd8lb600fs_config *config = dev->config;
|
|
struct bd8lb600fs_drv_data *drv_data = dev->data;
|
|
|
|
/* cannot execute a bus operation in an ISR context */
|
|
if (k_is_in_isr()) {
|
|
return -EWOULDBLOCK;
|
|
}
|
|
|
|
k_mutex_lock(&drv_data->lock, K_FOREVER);
|
|
drv_data->state ^= mask;
|
|
|
|
int result = write_state(config, drv_data->state);
|
|
|
|
k_mutex_unlock(&drv_data->lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
static const struct gpio_driver_api api_table = {
|
|
.pin_configure = bd8lb600fs_pin_configure,
|
|
.port_get_raw = bd8lb600fs_port_get_raw,
|
|
.port_set_masked_raw = bd8lb600fs_port_set_masked_raw,
|
|
.port_set_bits_raw = bd8lb600fs_port_set_bits_raw,
|
|
.port_clear_bits_raw = bd8lb600fs_port_clear_bits_raw,
|
|
.port_toggle_bits = bd8lb600fs_port_toggle_bits,
|
|
};
|
|
|
|
static int bd8lb600fs_init(const struct device *dev)
|
|
{
|
|
const struct bd8lb600fs_config *config = dev->config;
|
|
struct bd8lb600fs_drv_data *drv_data = dev->data;
|
|
|
|
if (!spi_is_ready_dt(&config->bus)) {
|
|
LOG_ERR("SPI bus %s not ready", config->bus.bus->name);
|
|
return -ENODEV;
|
|
}
|
|
|
|
int result = k_mutex_init(&drv_data->lock);
|
|
|
|
if (result != 0) {
|
|
LOG_ERR("unable to initialize mutex");
|
|
return result;
|
|
}
|
|
|
|
result = gpio_pin_configure_dt(&config->gpio_reset, GPIO_OUTPUT_ACTIVE);
|
|
|
|
if (result != 0) {
|
|
LOG_ERR("failed to initialize GPIO for reset");
|
|
return result;
|
|
}
|
|
|
|
k_busy_wait(WAIT_TIME_RESET_ACTIVE_IN_US);
|
|
gpio_pin_set_dt(&config->gpio_reset, 0);
|
|
k_busy_wait(WAIT_TIME_RESET_INACTIVE_TO_CS_IN_US);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define BD8LB600FS_INIT(inst) \
|
|
static const struct bd8lb600fs_config bd8lb600fs_##inst##_config = { \
|
|
.common = \
|
|
{ \
|
|
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(inst), \
|
|
}, \
|
|
.bus = SPI_DT_SPEC_INST_GET( \
|
|
inst, SPI_OP_MODE_MASTER | SPI_MODE_CPHA | SPI_WORD_SET(8), 0), \
|
|
.gpio_reset = GPIO_DT_SPEC_GET_BY_IDX(DT_DRV_INST(inst), reset_gpios, 0), \
|
|
}; \
|
|
\
|
|
static struct bd8lb600fs_drv_data bd8lb600fs_##inst##_drvdata = { \
|
|
.state = 0x00, \
|
|
.configured = 0x00, \
|
|
}; \
|
|
\
|
|
/* This has to be initialized after the SPI peripheral. */ \
|
|
DEVICE_DT_INST_DEFINE(inst, bd8lb600fs_init, NULL, &bd8lb600fs_##inst##_drvdata, \
|
|
&bd8lb600fs_##inst##_config, POST_KERNEL, \
|
|
CONFIG_GPIO_BD8LB600FS_INIT_PRIORITY, &api_table);
|
|
|
|
DT_INST_FOREACH_STATUS_OKAY(BD8LB600FS_INIT)
|