drivers: gpio: ti: add gpio extender sn74hc595
Add driver for spi based gpio extender ti sn74hc595. Signed-off-by: Matthias Freese <m.freese@web.de>
This commit is contained in:
Matthias Freese
Carles Cufí
parent
5043083a0f
commit
938eae3372
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@ -56,6 +56,7 @@ zephyr_library_sources_ifdef(CONFIG_GPIO_NCT38XX_INTERRUPT gpio_nct38xx_alert.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_TEST gpio_test.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_GD32 gpio_gd32.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_XLNX_PS gpio_xlnx_ps.c gpio_xlnx_ps_bank.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SN74HC595 gpio_sn74hc595.c)
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zephyr_library_sources_ifdef(CONFIG_GPIO_SHELL gpio_shell.c)
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@ -133,4 +133,6 @@ source "drivers/gpio/Kconfig.gd32"
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source "drivers/gpio/Kconfig.xlnx_ps"
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source "drivers/gpio/Kconfig.sn74hc595"
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endif # GPIO
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18
drivers/gpio/Kconfig.sn74hc595
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18
drivers/gpio/Kconfig.sn74hc595
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@ -0,0 +1,18 @@
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# Copyright (c) 2022 Matthias Freese
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# SPDX-License-Identifier: Apache-2.0
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config GPIO_SN74HC595
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bool "SN74HC595 shift register as GPIO extender"
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depends on SPI
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help
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Use SN74HC595 as GPIO extender
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if GPIO_SN74HC595
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config GPIO_SN74HC595_INIT_PRIORITY
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int "Init priority"
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default 71
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help
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Device driver initialization priority.
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endif
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211
drivers/gpio/gpio_sn74hc595.c
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211
drivers/gpio/gpio_sn74hc595.c
Normal file
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@ -0,0 +1,211 @@
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/*
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* Copyright (c) 2022 Matthias Freese
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT ti_sn74hc595
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/**
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* @file Driver for 74 HC shift register
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*/
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/drivers/spi.h>
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/zephyr.h>
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#include "gpio_utils.h"
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(gpio_sn74hc595, CONFIG_GPIO_LOG_LEVEL);
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#if CONFIG_SPI_INIT_PRIORITY >= CONFIG_GPIO_SN74HC595_INIT_PRIORITY
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#error SPI_INIT_PRIORITY must be lower than SN74HC595_INIT_PRIORITY
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#endif
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struct gpio_sn74hc595_config {
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/* gpio_driver_config needs to be first */
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struct gpio_driver_config config;
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struct spi_dt_spec bus;
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struct gpio_dt_spec reset_gpio;
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};
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struct gpio_sn74hc595_drv_data {
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/* gpio_driver_data needs to be first */
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struct gpio_driver_data data;
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struct k_mutex lock;
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uint8_t output;
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};
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static int sn74hc595_spi_write(const struct device *dev, void *buf, size_t len_bytes)
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{
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const struct gpio_sn74hc595_config *config = dev->config;
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__ASSERT(((buf != NULL) || (len_bytes == 0)), "no valid buffer given");
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__ASSERT(!k_is_in_isr(), "attempt to access SPI from ISR");
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struct spi_buf tx_buf[] = { { .buf = buf, .len = len_bytes } };
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const struct spi_buf_set tx = { .buffers = tx_buf, .count = 1 };
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return spi_write_dt(&config->bus, &tx);
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}
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static int gpio_sn74hc595_config(const struct device *dev, gpio_pin_t pin, gpio_flags_t flags)
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{
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ARG_UNUSED(dev);
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ARG_UNUSED(pin);
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ARG_UNUSED(flags);
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return 0;
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}
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static int gpio_sn74hc595_port_get_raw(const struct device *dev, uint32_t *value)
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{
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struct gpio_sn74hc595_drv_data *drv_data = dev->data;
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k_mutex_lock(&drv_data->lock, K_FOREVER);
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*value = drv_data->output;
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k_mutex_unlock(&drv_data->lock);
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return 0;
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}
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static int gpio_sn74hc595_port_set_masked_raw(const struct device *dev, uint32_t mask,
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uint32_t value)
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{
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struct gpio_sn74hc595_drv_data *drv_data = dev->data;
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int ret = 0;
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uint8_t output;
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k_mutex_lock(&drv_data->lock, K_FOREVER);
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/* check if we need to do something at all */
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/* current output differs from new masked value */
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if ((drv_data->output & mask) != (mask & value)) {
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output = (drv_data->output & ~mask) | (mask & value);
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ret = sn74hc595_spi_write(dev, &output, 1U);
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if (ret < 0) {
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goto unlock;
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}
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drv_data->output = output;
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}
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unlock:
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k_mutex_unlock(&drv_data->lock);
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return ret;
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}
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static int gpio_sn74hc595_port_set_bits_raw(const struct device *dev, uint32_t mask)
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{
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return gpio_sn74hc595_port_set_masked_raw(dev, mask, mask);
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}
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static int gpio_sn74hc595_port_clear_bits_raw(const struct device *dev, uint32_t mask)
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{
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return gpio_sn74hc595_port_set_masked_raw(dev, mask, 0U);
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}
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static int gpio_sn74hc595_port_toggle_bits(const struct device *dev, uint32_t mask)
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{
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struct gpio_sn74hc595_drv_data *drv_data = dev->data;
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int ret;
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uint8_t toggled_output;
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k_mutex_lock(&drv_data->lock, K_FOREVER);
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toggled_output = drv_data->output ^ mask;
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ret = sn74hc595_spi_write(dev, &toggled_output, 1U);
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if (ret < 0) {
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goto unlock;
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}
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drv_data->output ^= mask;
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unlock:
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k_mutex_unlock(&drv_data->lock);
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return ret;
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}
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static int gpio_sn74hc595_pin_interrupt_configure(const struct device *dev, gpio_pin_t pin,
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enum gpio_int_mode mode, 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_sn74hc595_drv_api_funcs = {
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.pin_configure = gpio_sn74hc595_config,
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.port_get_raw = gpio_sn74hc595_port_get_raw,
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.port_set_masked_raw = gpio_sn74hc595_port_set_masked_raw,
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.port_set_bits_raw = gpio_sn74hc595_port_set_bits_raw,
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.port_clear_bits_raw = gpio_sn74hc595_port_clear_bits_raw,
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.port_toggle_bits = gpio_sn74hc595_port_toggle_bits,
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.pin_interrupt_configure = gpio_sn74hc595_pin_interrupt_configure,
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};
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/**
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* @brief Initialization function of sn74hc595
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*
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* @param dev Device struct
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* @return 0 if successful, failed otherwise.
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*/
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static int gpio_sn74hc595_init(const struct device *dev)
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{
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const struct gpio_sn74hc595_config *config = dev->config;
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struct gpio_sn74hc595_drv_data *drv_data = dev->data;
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if (!spi_is_ready(&config->bus)) {
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LOG_ERR("SPI bus %s not ready", config->bus.bus->name);
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return -ENODEV;
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}
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if (!device_is_ready(config->reset_gpio.port)) {
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LOG_ERR("GPIO port %s not ready", config->reset_gpio.port->name);
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return -ENODEV;
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}
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if (gpio_pin_configure_dt(&config->reset_gpio, GPIO_OUTPUT_ACTIVE) < 0) {
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LOG_ERR("Unable to configure RST GPIO pin %u", config->reset_gpio.pin);
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return -EINVAL;
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}
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gpio_pin_set(config->reset_gpio.port, config->reset_gpio.pin, 0);
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drv_data->output = 0U;
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return 0;
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}
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#define SN74HC595_SPI_OPERATION \
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((uint16_t)(SPI_OP_MODE_MASTER | SPI_TRANSFER_MSB | SPI_WORD_SET(8)))
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#define SN74HC595_INIT(n) \
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static struct gpio_sn74hc595_drv_data sn74hc595_data_##n = { \
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.output = 0, \
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.lock = Z_MUTEX_INITIALIZER(sn74hc595_data_##n.lock), \
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}; \
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\
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static const struct gpio_sn74hc595_config sn74hc595_config_##n = { \
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.config = { \
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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 = SPI_DT_SPEC_INST_GET(n, SN74HC595_SPI_OPERATION, 0), \
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.reset_gpio = GPIO_DT_SPEC_INST_GET(n, reset_gpios), \
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}; \
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\
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DEVICE_DT_DEFINE(DT_DRV_INST(n), &gpio_sn74hc595_init, NULL, \
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&sn74hc595_data_##n, &sn74hc595_config_##n, POST_KERNEL, \
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CONFIG_GPIO_SN74HC595_INIT_PRIORITY, &gpio_sn74hc595_drv_api_funcs);
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DT_INST_FOREACH_STATUS_OKAY(SN74HC595_INIT)
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