blob: 02e977e702df49319b12fc51c61a1d9076734d39 [file] [log] [blame]
/*
* Copyright (c) 2024 SILA Embedded Solutions GmbH
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT rohm_bd8lb600fs
#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/mfd/bd8lb600fs.h>
#include <zephyr/drivers/spi.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys/byteorder.h>
LOG_MODULE_REGISTER(rohm_bd8lb600fs, CONFIG_MFD_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 {
struct spi_dt_spec bus;
const struct gpio_dt_spec gpio_reset;
size_t instance_count;
};
struct bd8lb600fs_data {
/* each bit is one output channel, bit 0 = channel 1, ... */
uint32_t state;
/* each bit defines if an open load was detected, see state */
uint32_t old;
/* each bit defines if an over current or over temperature was detected, see state */
uint32_t ocp_or_tsd;
struct k_mutex lock;
};
static void bd8lb600fs_fill_tx_buffer(const struct device *dev, uint8_t *buffer, size_t buffer_size)
{
const struct bd8lb600fs_config *config = dev->config;
struct bd8lb600fs_data *data = dev->data;
uint16_t state_converted = 0;
LOG_DBG("%s: writing state 0x%08X to BD8LB600FS", dev->name, data->state);
memset(buffer, 0x00, buffer_size);
for (size_t j = 0; j < config->instance_count; ++j) {
int instance_position = (config->instance_count - j - 1) * 2;
state_converted = 0;
for (size_t i = 0; i < 8; ++i) {
if ((data->state & BIT(i + j * 8)) == 0) {
state_converted |= OUTPUT_OFF_WITH_OPEN_LOAD_DETECTION << (i * 2);
} else {
state_converted |= OUTPUT_ON << (i * 2);
}
}
LOG_DBG("%s: configuration for instance %zu: %04X (position %i)", dev->name, j,
state_converted, instance_position);
sys_put_be16(state_converted, buffer + instance_position);
}
}
static void bd8lb600fs_parse_rx_buffer(const struct device *dev, uint8_t *buffer)
{
const struct bd8lb600fs_config *config = dev->config;
struct bd8lb600fs_data *data = dev->data;
data->old = 0;
data->ocp_or_tsd = 0;
for (size_t j = 0; j < config->instance_count; ++j) {
int instance_position = (config->instance_count - j - 1) * 2;
uint16_t current = sys_get_be16(buffer + instance_position);
for (size_t i = 0; i < 8; ++i) {
if ((BIT(2 * i + 1) & current) != 0) {
WRITE_BIT(data->old, i + j * 8, 1);
}
if ((BIT(2 * i) & current) != 0) {
WRITE_BIT(data->ocp_or_tsd, i + j * 8, 1);
}
}
}
LOG_DBG("%s: received 0x%08X open load state from BD8LB600FS", dev->name, data->old);
LOG_DBG("%s: received 0x%08X OCP or TSD state from BD8LB600FS", dev->name,
data->ocp_or_tsd);
}
static int bd8lb600fs_transceive_state(const struct device *dev)
{
const struct bd8lb600fs_config *config = dev->config;
uint8_t buffer_tx[8];
const struct spi_buf tx_buf = {
.buf = buffer_tx,
.len = config->instance_count * sizeof(uint16_t),
};
const struct spi_buf_set tx = {
.buffers = &tx_buf,
.count = 1,
};
uint8_t buffer_rx[8];
const struct spi_buf rx_buf = {
.buf = buffer_rx,
.len = config->instance_count * sizeof(uint16_t),
};
const struct spi_buf_set rx = {
.buffers = &rx_buf,
.count = 1,
};
bd8lb600fs_fill_tx_buffer(dev, buffer_tx, ARRAY_SIZE(buffer_tx));
int result = spi_transceive_dt(&config->bus, &tx, &rx);
if (result != 0) {
LOG_ERR("spi_transceive failed with error %i", result);
return result;
}
bd8lb600fs_parse_rx_buffer(dev, buffer_rx);
return 0;
}
static int bd8lb600fs_write_state(const struct device *dev)
{
const struct bd8lb600fs_config *config = dev->config;
uint8_t buffer_tx[8];
const struct spi_buf tx_buf = {
.buf = buffer_tx,
.len = config->instance_count * sizeof(uint16_t),
};
const struct spi_buf_set tx = {
.buffers = &tx_buf,
.count = 1,
};
bd8lb600fs_fill_tx_buffer(dev, buffer_tx, ARRAY_SIZE(buffer_tx));
int result = spi_write_dt(&config->bus, &tx);
if (result != 0) {
LOG_ERR("spi_transceive failed with error %i", result);
return result;
}
return 0;
}
int mfd_bd8lb600fs_set_outputs(const struct device *dev, uint32_t values)
{
struct bd8lb600fs_data *data = dev->data;
int result;
k_mutex_lock(&data->lock, K_FOREVER);
data->state = values;
result = bd8lb600fs_write_state(dev);
k_mutex_unlock(&data->lock);
return result;
}
int mfd_bd8lb600fs_get_output_diagnostics(const struct device *dev, uint32_t *old,
uint32_t *ocp_or_tsd)
{
struct bd8lb600fs_data *data = dev->data;
int result;
k_mutex_lock(&data->lock, K_FOREVER);
result = bd8lb600fs_transceive_state(dev);
*old = data->old;
*ocp_or_tsd = data->ocp_or_tsd;
k_mutex_unlock(&data->lock);
return result;
}
static int bd8lb600fs_init(const struct device *dev)
{
const struct bd8lb600fs_config *config = dev->config;
struct bd8lb600fs_data *data = dev->data;
if (!spi_is_ready_dt(&config->bus)) {
LOG_ERR("SPI bus %s not ready", config->bus.bus->name);
return -ENODEV;
}
if (!gpio_is_ready_dt(&config->gpio_reset)) {
LOG_ERR("%s: reset GPIO is not ready", dev->name);
return -ENODEV;
}
int result = k_mutex_init(&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 = { \
.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), \
.instance_count = DT_INST_PROP(inst, instance_count), \
}; \
\
static struct bd8lb600fs_data bd8lb600fs_##inst##_data = { \
.state = 0x00, \
}; \
\
/* This has to be initialized after the SPI peripheral. */ \
DEVICE_DT_INST_DEFINE(inst, bd8lb600fs_init, NULL, &bd8lb600fs_##inst##_data, \
&bd8lb600fs_##inst##_config, POST_KERNEL, CONFIG_MFD_INIT_PRIORITY, \
NULL);
DT_INST_FOREACH_STATUS_OKAY(BD8LB600FS_INIT)