246 lines
6.3 KiB
C
246 lines
6.3 KiB
C
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/*
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* Copyright (c) 2022 Nordic Semiconductor ASA
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nordic_npm6001_gpio
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#include <errno.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/gpio/gpio_utils.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/dt-bindings/gpio/nordic-npm6001-gpio.h>
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#include <zephyr/kernel.h>
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#include <zephyr/sys/util_macro.h>
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#include <zephyr/toolchain.h>
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/* nPM6001 GPIO related registers */
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#define NPM6001_GPIOOUTSET 0x69U
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#define NPM6001_GPIOOUTCLR 0x6AU
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#define NPM6001_GPIOIN 0x6BU
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#define NPM6001_GPIO0CONF 0x6CU
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#define NPM6001_GPIO1CONF 0x6DU
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#define NPM6001_GPIO2CONF 0x6EU
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/* GPIO(0|1|2)CONF fields */
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#define NPM6001_CONF_DIRECTION_OUTPUT BIT(0)
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#define NPM6001_CONF_INPUT_ENABLED BIT(1)
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#define NPM6001_CONF_PULLDOWN_ENABLED BIT(2)
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#define NPM6001_CONF_DRIVE_HIGH BIT(5)
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#define NPM6001_CONF_SENSE_CMOS BIT(6)
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#define NPM6001_PIN_MAX 2U
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#define NPM6001_PIN_MSK 0x7U
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struct gpio_npm6001_config {
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struct gpio_driver_config common;
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struct i2c_dt_spec bus;
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};
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struct gpio_npm6001_data {
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struct gpio_driver_data common;
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};
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static int gpio_npm6001_port_get_raw(const struct device *dev, uint32_t *value)
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{
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const struct gpio_npm6001_config *config = dev->config;
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uint8_t reg = NPM6001_GPIOIN;
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uint8_t val;
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int ret;
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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ret = i2c_write_read_dt(&config->bus, ®, sizeof(reg), &val,
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sizeof(val));
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if (ret < 0) {
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return ret;
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}
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*value = val;
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return 0;
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}
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static int gpio_npm6001_port_set_bits_raw(const struct device *dev,
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gpio_port_pins_t pins)
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{
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const struct gpio_npm6001_config *config = dev->config;
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uint8_t buf[2] = {NPM6001_GPIOOUTSET, (uint8_t)pins & NPM6001_PIN_MSK};
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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return i2c_write_dt(&config->bus, buf, sizeof(buf));
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}
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static int gpio_npm6001_port_clear_bits_raw(const struct device *dev,
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gpio_port_pins_t pins)
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{
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const struct gpio_npm6001_config *config = dev->config;
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uint8_t buf[2] = {NPM6001_GPIOOUTCLR, (uint8_t)pins & NPM6001_PIN_MSK};
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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return i2c_write_dt(&config->bus, buf, sizeof(buf));
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}
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static inline int gpio_npm6001_configure(const struct device *dev,
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gpio_pin_t pin, gpio_flags_t flags)
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{
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const struct gpio_npm6001_config *config = dev->config;
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uint8_t buf[2] = {NPM6001_GPIO0CONF, 0U};
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if (k_is_in_isr()) {
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return -EWOULDBLOCK;
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}
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if (pin > NPM6001_PIN_MAX) {
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return -EINVAL;
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}
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/* select GPIO0CONF/GPIO1CONF/GPIO2CONF */
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buf[0] += pin;
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if ((flags & GPIO_OUTPUT) != 0U) {
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/* input buffer enabled to allow reading output level */
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buf[1] |= NPM6001_CONF_DIRECTION_OUTPUT |
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NPM6001_CONF_INPUT_ENABLED;
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/* open-drain/open-source not supported */
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if ((flags & GPIO_SINGLE_ENDED) != 0U) {
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return -ENOTSUP;
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}
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/* drive strength (defaults to normal) */
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if ((flags & NPM6001_GPIO_DRIVE_MSK) ==
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NPM6001_GPIO_DRIVE_HIGH) {
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buf[1] |= NPM6001_CONF_DRIVE_HIGH;
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}
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if ((flags & GPIO_OUTPUT_INIT_HIGH) != 0U) {
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int ret;
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ret = gpio_npm6001_port_set_bits_raw(
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dev, (gpio_port_pins_t)BIT(pin));
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if (ret < 0) {
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return ret;
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}
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} else if ((flags & GPIO_OUTPUT_INIT_LOW) != 0U) {
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int ret;
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ret = gpio_npm6001_port_clear_bits_raw(
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dev, (gpio_port_pins_t)BIT(pin));
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if (ret < 0) {
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return ret;
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}
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}
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} else if ((flags & GPIO_INPUT) != 0U) {
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buf[1] |= NPM6001_CONF_INPUT_ENABLED;
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/* pull resistor */
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if ((flags & GPIO_PULL_DOWN) != 0U) {
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buf[1] |= NPM6001_CONF_PULLDOWN_ENABLED;
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} else if ((flags & GPIO_PULL_UP) != 0U) {
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return -ENOTSUP;
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}
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/* input type (defaults to schmitt trigger) */
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if ((flags & NPM6001_GPIO_SENSE_MSK) ==
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NPM6001_GPIO_SENSE_CMOS) {
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buf[1] |= NPM6001_CONF_SENSE_CMOS;
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}
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} else {
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return -ENOTSUP;
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}
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return i2c_write_dt(&config->bus, buf, sizeof(buf));
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}
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static int gpio_npm6001_port_set_masked_raw(const struct device *dev,
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gpio_port_pins_t mask,
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gpio_port_value_t value)
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{
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int ret;
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ret = gpio_npm6001_port_set_bits_raw(dev, mask & value);
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if (ret < 0) {
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return ret;
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}
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return gpio_npm6001_port_clear_bits_raw(
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dev, mask & (~value & NPM6001_PIN_MSK));
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}
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static int gpio_npm6001_port_toggle_bits(const struct device *dev,
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gpio_port_pins_t pins)
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{
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uint32_t val;
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int ret;
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ret = gpio_npm6001_port_get_raw(dev, &val);
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if (ret < 0) {
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return ret;
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}
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return gpio_npm6001_port_set_masked_raw(dev, pins,
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~val & NPM6001_PIN_MSK);
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}
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static int gpio_npm6001_pin_interrupt_configure(const struct device *dev,
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gpio_pin_t pin,
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enum gpio_int_mode mode,
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enum gpio_int_trig trig)
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{
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ARG_UNUSED(dev);
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ARG_UNUSED(pin);
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ARG_UNUSED(mode);
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ARG_UNUSED(trig);
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return -ENOTSUP;
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}
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static const struct gpio_driver_api gpio_npm6001_api = {
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.pin_configure = gpio_npm6001_configure,
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.port_get_raw = gpio_npm6001_port_get_raw,
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.port_set_masked_raw = gpio_npm6001_port_set_masked_raw,
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.port_set_bits_raw = gpio_npm6001_port_set_bits_raw,
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.port_clear_bits_raw = gpio_npm6001_port_clear_bits_raw,
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.port_toggle_bits = gpio_npm6001_port_toggle_bits,
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.pin_interrupt_configure = gpio_npm6001_pin_interrupt_configure,
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};
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static int gpio_npm6001_init(const struct device *dev)
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{
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const struct gpio_npm6001_config *config = dev->config;
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if (!device_is_ready(config->bus.bus)) {
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return -ENODEV;
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}
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return 0;
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}
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#define GPIO_NPM6001_DEFINE(n) \
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static const struct gpio_npm6001_config gpio_npm6001_config##n = { \
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.common = \
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{ \
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.port_pin_mask = \
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GPIO_PORT_PIN_MASK_FROM_DT_INST(n), \
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}, \
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.bus = I2C_DT_SPEC_GET(DT_INST_PARENT(n))}; \
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\
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static struct gpio_npm6001_data gpio_npm6001_data##n; \
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\
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DEVICE_DT_INST_DEFINE(n, &gpio_npm6001_init, NULL, \
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&gpio_npm6001_data##n, &gpio_npm6001_config##n, \
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POST_KERNEL, CONFIG_GPIO_NPM6001_INIT_PRIORITY, \
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&gpio_npm6001_api);
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DT_INST_FOREACH_STATUS_OKAY(GPIO_NPM6001_DEFINE)
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