blob: c45e9d51a6007567c0604229368696d36af2fa97 [file] [log] [blame]
/*
* Copyright (c), 2023 Basalte bv
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_sc18im704_gpio
#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/logging/log.h>
LOG_MODULE_REGISTER(gpio_sc18im, CONFIG_GPIO_LOG_LEVEL);
#include "i2c/i2c_sc18im704.h"
#define GPIO_SC18IM_MAX_PINS 8
/* After reset the GPIO config registers are 0x55 */
#define GPIO_SC18IM_DEFAULT_CONF 0x55
#define GPIO_SC18IM_CONF_INPUT 0x01
#define GPIO_SC18IM_CONF_PUSH_PULL 0x02
#define GPIO_SC18IM_CONF_OPEN_DRAIN 0x03
#define GPIO_SC18IM_CONF_MASK 0x03
struct gpio_sc18im_config {
/* gpio_driver_config needs to be first */
struct gpio_driver_config common;
const struct device *bridge;
};
struct gpio_sc18im_data {
/* gpio_driver_data needs to be first */
struct gpio_driver_data common;
uint8_t conf1;
uint8_t conf2;
uint8_t output_state;
};
static int gpio_sc18im_port_set_raw(const struct device *port,
uint8_t mask, uint8_t value, uint8_t toggle)
{
const struct gpio_sc18im_config *cfg = port->config;
struct gpio_sc18im_data *data = port->data;
uint8_t buf[] = {
SC18IM704_CMD_WRITE_GPIO,
data->output_state,
SC18IM704_CMD_STOP,
};
int ret;
if (k_is_in_isr()) {
return -EWOULDBLOCK;
}
buf[1] &= ~mask;
buf[1] |= (value & mask);
buf[1] ^= toggle;
ret = sc18im704_transfer(cfg->bridge, buf, sizeof(buf), NULL, 0);
if (ret < 0) {
LOG_ERR("Failed to write GPIO state (%d)", ret);
return ret;
}
data->output_state = buf[1];
return 0;
}
static int gpio_sc18im_pin_configure(const struct device *port, gpio_pin_t pin,
gpio_flags_t flags)
{
const struct gpio_sc18im_config *cfg = port->config;
struct gpio_sc18im_data *data = port->data;
uint8_t pin_conf;
int ret;
uint8_t buf[] = {
SC18IM704_CMD_WRITE_REG,
0x00,
0x00,
SC18IM704_CMD_STOP,
};
if (pin >= GPIO_SC18IM_MAX_PINS) {
return -EINVAL;
}
if (flags & (GPIO_PULL_UP | GPIO_PULL_DOWN)) {
return -ENOTSUP;
}
if (flags & GPIO_INPUT) {
pin_conf = GPIO_SC18IM_CONF_INPUT;
} else if (flags & GPIO_OUTPUT) {
if (flags & GPIO_SINGLE_ENDED) {
if (flags & GPIO_LINE_OPEN_DRAIN) {
pin_conf = GPIO_SC18IM_CONF_OPEN_DRAIN;
} else {
/* Open-drain is the only supported single-ended mode */
return -ENOTSUP;
}
} else {
/* Default to push/pull */
pin_conf = GPIO_SC18IM_CONF_PUSH_PULL;
}
} else {
/* Neither input nor output mode is selected */
return -ENOTSUP;
}
ret = sc18im704_claim(cfg->bridge);
if (ret < 0) {
LOG_ERR("Failed to claim bridge (%d)", ret);
return ret;
}
if (pin < 4) {
/* Shift the config to the pin offset */
data->conf1 &= ~(GPIO_SC18IM_CONF_MASK << (pin * 2));
data->conf1 |= pin_conf << (pin * 2);
buf[1] = SC18IM704_REG_GPIO_CONF1;
buf[2] = data->conf1;
} else {
/* Shift the config to the pin offset */
data->conf2 &= ~(GPIO_SC18IM_CONF_MASK << ((pin - 4) * 2));
data->conf2 |= pin_conf << ((pin - 4) * 2);
buf[1] = SC18IM704_REG_GPIO_CONF2;
buf[2] = data->conf2;
}
ret = sc18im704_transfer(cfg->bridge, buf, sizeof(buf), NULL, 0);
if (ret < 0) {
LOG_ERR("Failed to configure GPIO (%d)", ret);
}
if (ret == 0 && flags & GPIO_OUTPUT) {
if (flags & GPIO_OUTPUT_INIT_HIGH) {
gpio_sc18im_port_set_raw(port, BIT(pin), BIT(pin), 0);
}
if (flags & GPIO_OUTPUT_INIT_LOW) {
gpio_sc18im_port_set_raw(port, BIT(pin), 0, 0);
}
}
sc18im704_release(cfg->bridge);
return ret;
}
#ifdef CONFIG_GPIO_GET_CONFIG
static int gpio_sc18im_pin_get_config(const struct device *port, gpio_pin_t pin,
gpio_flags_t *flags)
{
struct gpio_sc18im_data *data = port->data;
uint8_t conf;
if (pin >= GPIO_SC18IM_MAX_PINS) {
return -EINVAL;
}
if (pin < 4) {
conf = (data->conf1 >> (2 * pin)) & GPIO_SC18IM_CONF_MASK;
} else {
conf = (data->conf2 >> (2 * (pin - 4))) & GPIO_SC18IM_CONF_MASK;
}
switch (conf) {
case GPIO_SC18IM_CONF_PUSH_PULL:
*flags = GPIO_OUTPUT | GPIO_PUSH_PULL;
break;
case GPIO_SC18IM_CONF_OPEN_DRAIN:
*flags = GPIO_OUTPUT | GPIO_SINGLE_ENDED | GPIO_LINE_OPEN_DRAIN;
break;
case GPIO_SC18IM_CONF_INPUT:
default:
*flags = GPIO_INPUT;
break;
}
return 0;
}
#endif
static int gpio_sc18im_port_get_raw(const struct device *port, gpio_port_value_t *value)
{
const struct gpio_sc18im_config *cfg = port->config;
uint8_t buf[] = {
SC18IM704_CMD_READ_GPIO,
SC18IM704_CMD_STOP,
};
uint8_t data;
int ret;
if (k_is_in_isr()) {
return -EWOULDBLOCK;
}
ret = sc18im704_transfer(cfg->bridge, buf, sizeof(buf), &data, 1);
if (ret < 0) {
LOG_ERR("Failed to read GPIO state (%d)", ret);
return ret;
}
*value = data;
return 0;
}
static int gpio_sc18im_port_set_masked_raw(const struct device *port,
gpio_port_pins_t mask,
gpio_port_value_t value)
{
return gpio_sc18im_port_set_raw(port, (uint8_t)mask, (uint8_t)value, 0);
}
static int gpio_sc18im_port_set_bits_raw(const struct device *port, gpio_port_pins_t pins)
{
return gpio_sc18im_port_set_raw(port, (uint8_t)pins, (uint8_t)pins, 0);
}
static int gpio_sc18im_port_clear_bits_raw(const struct device *port, gpio_port_pins_t pins)
{
return gpio_sc18im_port_set_raw(port, (uint8_t)pins, 0, 0);
}
static int gpio_sc18im_port_toggle_bits(const struct device *port, gpio_port_pins_t pins)
{
return gpio_sc18im_port_set_raw(port, 0, 0, (uint8_t)pins);
}
static int gpio_sc18im_init(const struct device *dev)
{
const struct gpio_sc18im_config *cfg = dev->config;
if (!device_is_ready(cfg->bridge)) {
LOG_ERR("Parent device not ready");
return -ENODEV;
}
return 0;
}
static const struct gpio_driver_api gpio_sc18im_driver_api = {
.pin_configure = gpio_sc18im_pin_configure,
#ifdef CONFIG_GPIO_GET_CONFIG
.pin_get_config = gpio_sc18im_pin_get_config,
#endif
.port_get_raw = gpio_sc18im_port_get_raw,
.port_set_masked_raw = gpio_sc18im_port_set_masked_raw,
.port_set_bits_raw = gpio_sc18im_port_set_bits_raw,
.port_clear_bits_raw = gpio_sc18im_port_clear_bits_raw,
.port_toggle_bits = gpio_sc18im_port_toggle_bits,
};
#define CHECK_COMPAT(node) \
COND_CODE_1(DT_NODE_HAS_COMPAT(node, nxp_sc18im704_i2c), (DEVICE_DT_GET(node)), ())
#define GPIO_SC18IM704_I2C_SIBLING(n) \
DT_FOREACH_CHILD_STATUS_OKAY(DT_INST_PARENT(n), CHECK_COMPAT)
#define GPIO_SC18IM704_DEFINE(n) \
static const struct gpio_sc18im_config gpio_sc18im_config_##n = { \
.common = { \
.port_pin_mask = GPIO_PORT_PIN_MASK_FROM_DT_INST(n), \
}, \
.bridge = GPIO_SC18IM704_I2C_SIBLING(n), \
}; \
static struct gpio_sc18im_data gpio_sc18im_data_##n = { \
.conf1 = GPIO_SC18IM_DEFAULT_CONF, \
.conf2 = GPIO_SC18IM_DEFAULT_CONF, \
}; \
\
DEVICE_DT_INST_DEFINE(n, gpio_sc18im_init, NULL, \
&gpio_sc18im_data_##n, &gpio_sc18im_config_##n, \
POST_KERNEL, CONFIG_GPIO_SC18IM704_INIT_PRIORITY, \
&gpio_sc18im_driver_api);
DT_INST_FOREACH_STATUS_OKAY(GPIO_SC18IM704_DEFINE);