patrick/zephyr
1
0
Fork 0
Code Issues Pull requests Actions 7 Packages Projects Releases Wiki Activity

drivers: gpio: add driver for BD8LB600FS

Browse source 
Add a driver for BD8LB600FS

Signed-off-by: Benedikt Schmidt <benedikt.schmidt@embedded-solutions.at>
This commit is contained in:
Benedikt Schmidt 2023-02-09 13:35:25 +01:00 committed by Christopher Friedt
parent 6453564bc1
commit fd44b2eb2d
4 changed files with 289 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
drivers/gpio/CMakeLists.txt
View file

@ -17,6 +17,7 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_MCP23S17 gpio_mcp23s17.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_MCP23XXX gpio_mcp23xxx.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_MCP23SXX gpio_mcp23sxx.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_MCP230XX gpio_mcp230xx.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_BD8LB600FS gpio_bd8lb600fs.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_MCUX gpio_mcux.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_MCUX_IGPIO gpio_mcux_igpio.c)
zephyr_library_sources_ifdef(CONFIG_GPIO_MCUX_LPC gpio_mcux_lpc.c)

2
drivers/gpio/Kconfig
View file

@ -177,6 +177,8 @@ source "drivers/gpio/Kconfig.rt1718s"
source "drivers/gpio/Kconfig.numicro"
source "drivers/gpio/Kconfig.bd8lb600fs"
source "drivers/gpio/Kconfig.zephyr"
endif # GPIO

22
drivers/gpio/Kconfig.bd8lb600fs Normal file
View file

@ -0,0 +1,22 @@
# BD8LB600FS GPIO configuration options
# Copyright (c) 2022 SILA Embedded Solutions GmbH
# SPDX-License-Identifier: Apache-2.0
menuconfig GPIO_BD8LB600FS
bool "BD8LB600FS SPI-based GPIO chip"
default y
depends on DT_HAS_ROHM_BD8LB600FS_ENABLED
depends on SPI
help
Enable driver for BD8LB600FS SPI-based GPIO chip.
if GPIO_BD8LB600FS
config GPIO_BD8LB600FS_INIT_PRIORITY
int "Init priority"
default 75
help
Device driver initialization priority.
endif #GPIO_BD8LB600FS

264
drivers/gpio/gpio_bd8lb600fs.c Normal file
View file

@ -0,0 +1,264 @@
/*
* 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 int bd8lb600fs_pin_interrupt_configure(const struct device *dev, gpio_pin_t pin,
enum gpio_int_mode mode, enum gpio_int_trig trig)
{
return -ENOTSUP;
}
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,
.pin_interrupt_configure = bd8lb600fs_pin_interrupt_configure,
};
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)