drivers: can: add generic GPIO controlled CAN transceiver driver

Add generic driver for GPIO controlled CAN transceivers.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen 2022-02-28 15:16:50 +01:00 committed by Maureen Helm
commit 0783b51ee1
5 changed files with 162 additions and 0 deletions

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@ -16,3 +16,5 @@ zephyr_library_sources_ifdef(CONFIG_CAN_RCAR can_rcar.c)
zephyr_library_sources_ifdef(CONFIG_USERSPACE can_handlers.c)
zephyr_library_sources_ifdef(CONFIG_CAN_SHELL can_shell.c)
add_subdirectory(transceiver)

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@ -102,4 +102,6 @@ source "drivers/can/Kconfig.mcan"
source "drivers/can/Kconfig.rcar"
source "drivers/can/Kconfig.loopback"
source "drivers/can/transceiver/Kconfig"
endif # CAN

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@ -0,0 +1,6 @@
# Copyright (c) 2022 Vestas Wind Systems A/S
# SPDX-License-Identifier: Apache-2.0
zephyr_library()
zephyr_library_property(ALLOW_EMPTY TRUE)
zephyr_library_sources_ifdef(CONFIG_CAN_TRANSCEIVER_GPIO can_transceiver_gpio.c)

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@ -0,0 +1,21 @@
# CAN transceiver configuration options
# Copyright (c) 2022 Vestas Wind Systems A/S
# SPDX-License-Identifier: Apache-2.0
menu "CAN transceiver drivers"
config CAN_TRANSCEIVER_INIT_PRIORITY
int "CAN transceiver driver init priority"
default 70
help
CAN transceiver device driver initialization priority.
config CAN_TRANSCEIVER_GPIO
bool "GPIO controlled CAN transceiver"
depends on GPIO
default $(dt_compat_enabled,can-transceiver-gpio)
help
Enable support for GPIO controlled CAN transceivers.
endmenu

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@ -0,0 +1,131 @@
/*
* Copyright (c) 2022 Vestas Wind Systems A/S
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT can_transceiver_gpio
#include <device.h>
#include <drivers/can/transceiver.h>
#include <drivers/gpio.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(can_transceiver_gpio, CONFIG_CAN_LOG_LEVEL);
/* Does any devicetree instance have an enable-gpios property? */
#define INST_HAS_ENABLE_GPIOS_OR(inst) DT_INST_NODE_HAS_PROP(inst, enable_gpios) ||
#define ANY_INST_HAS_ENABLE_GPIOS DT_INST_FOREACH_STATUS_OKAY(INST_HAS_ENABLE_GPIOS_OR) 0
/* Does any devicetree instance have a standby-gpios property? */
#define INST_HAS_STANDBY_GPIOS_OR(inst) DT_INST_NODE_HAS_PROP(inst, standby_gpios) ||
#define ANY_INST_HAS_STANDBY_GPIOS DT_INST_FOREACH_STATUS_OKAY(INST_HAS_STANDBY_GPIOS_OR) 0
struct can_transceiver_gpio_config {
#if ANY_INST_HAS_ENABLE_GPIOS
struct gpio_dt_spec enable_gpio;
#endif /* ANY_INST_HAS_ENABLE_GPIOS */
#if ANY_INST_HAS_STANDBY_GPIOS
struct gpio_dt_spec standby_gpio;
#endif /* ANY_INST_HAS_STANDBY_GPIOS */
};
static int can_transceiver_gpio_set_state(const struct device *dev, bool enabled)
{
const struct can_transceiver_gpio_config *config = dev->config;
int err;
#if ANY_INST_HAS_ENABLE_GPIOS
if (config->enable_gpio.port != NULL) {
err = gpio_pin_set_dt(&config->enable_gpio, enabled ? 1 : 0);
if (err != 0) {
LOG_ERR("failed to set enable GPIO pin (err %d)", err);
return -EIO;
}
}
#endif /* ANY_INST_HAS_ENABLE_GPIOS */
#if ANY_INST_HAS_STANDBY_GPIOS
if (config->standby_gpio.port != NULL) {
err = gpio_pin_set_dt(&config->standby_gpio, enabled ? 0 : 1);
if (err != 0) {
LOG_ERR("failed to set standby GPIO pin (err %d)", err);
return -EIO;
}
}
#endif /* ANY_INST_HAS_STANDBY_GPIOS */
return 0;
}
static int can_transceiver_gpio_enable(const struct device *dev)
{
return can_transceiver_gpio_set_state(dev, true);
}
static int can_transceiver_gpio_disable(const struct device *dev)
{
return can_transceiver_gpio_set_state(dev, false);
}
static int can_transceiver_gpio_init(const struct device *dev)
{
const struct can_transceiver_gpio_config *config = dev->config;
int err;
#if ANY_INST_HAS_ENABLE_GPIOS
if (config->enable_gpio.port != NULL) {
if (!device_is_ready(config->enable_gpio.port)) {
LOG_ERR("enable pin GPIO device not ready");
return -EINVAL;
}
/* CAN transceiver is disabled during initialization */
err = gpio_pin_configure_dt(&config->enable_gpio, GPIO_OUTPUT_INACTIVE);
if (err != 0) {
LOG_ERR("failed to configure enable GPIO pin (err %d)", err);
return err;
}
}
#endif /* ANY_INST_HAS_ENABLE_GPIOS */
#if ANY_INST_HAS_STANDBY_GPIOS
if (config->standby_gpio.port != NULL) {
if (!device_is_ready(config->standby_gpio.port)) {
LOG_ERR("standby pin GPIO device not ready");
return -EINVAL;
}
/* CAN transceiver is put in standby during initialization */
err = gpio_pin_configure_dt(&config->standby_gpio, GPIO_OUTPUT_ACTIVE);
if (err != 0) {
LOG_ERR("failed to configure standby GPIO pin (err %d)", err);
return err;
}
}
#endif /* ANY_INST_HAS_STANDBY_GPIOS */
return 0;
}
static const struct can_transceiver_driver_api can_transceiver_gpio_driver_api = {
.enable = can_transceiver_gpio_enable,
.disable = can_transceiver_gpio_disable,
};
#define CAN_TRANSCEIVER_GPIO_COND(inst, name) \
IF_ENABLED(DT_INST_NODE_HAS_PROP(inst, name##_gpios), \
(.name##_gpio = GPIO_DT_SPEC_INST_GET(inst, name##_gpios),))
#define CAN_TRANSCEIVER_GPIO_INIT(inst) \
static const struct can_transceiver_gpio_config can_transceiver_gpio_config_##inst = { \
CAN_TRANSCEIVER_GPIO_COND(inst, enable) \
CAN_TRANSCEIVER_GPIO_COND(inst, standby) \
}; \
\
DEVICE_DT_INST_DEFINE(inst, &can_transceiver_gpio_init, \
NULL, NULL, &can_transceiver_gpio_config_##inst,\
POST_KERNEL, CONFIG_CAN_TRANSCEIVER_INIT_PRIORITY, \
&can_transceiver_gpio_driver_api); \
DT_INST_FOREACH_STATUS_OKAY(CAN_TRANSCEIVER_GPIO_INIT)