291 lines
8.7 KiB
C
291 lines
8.7 KiB
C
/*
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* Copyright (c) 2023 SILA Embedded Solutions GmbH
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/i2c/stm32.h>
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#include <zephyr/drivers/pinctrl.h>
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#include <zephyr/drivers/smbus.h>
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#include <zephyr/logging/log.h>
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#include <zephyr/sys/byteorder.h>
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#include <soc.h>
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#include "smbus_utils.h"
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LOG_MODULE_REGISTER(stm32_smbus, CONFIG_SMBUS_LOG_LEVEL);
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struct smbus_stm32_config {
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const struct pinctrl_dev_config *pcfg;
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const struct device *i2c_dev;
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};
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struct smbus_stm32_data {
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uint32_t config;
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const struct device *dev;
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#ifdef CONFIG_SMBUS_STM32_SMBALERT
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sys_slist_t smbalert_callbacks;
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struct k_work smbalert_work;
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#endif /* CONFIG_SMBUS_STM32_SMBALERT */
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};
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#ifdef CONFIG_SMBUS_STM32_SMBALERT
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static void smbus_stm32_smbalert_isr(const struct device *dev)
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{
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struct smbus_stm32_data *data = dev->data;
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k_work_submit(&data->smbalert_work);
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}
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static void smbus_stm32_smbalert_work(struct k_work *work)
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{
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struct smbus_stm32_data *data = CONTAINER_OF(work, struct smbus_stm32_data, smbalert_work);
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const struct device *dev = data->dev;
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LOG_DBG("%s: got SMB alert", dev->name);
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smbus_loop_alert_devices(dev, &data->smbalert_callbacks);
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}
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static int smbus_stm32_smbalert_set_cb(const struct device *dev, struct smbus_callback *cb)
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{
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struct smbus_stm32_data *data = dev->data;
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return smbus_callback_set(&data->smbalert_callbacks, cb);
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}
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static int smbus_stm32_smbalert_remove_cb(const struct device *dev, struct smbus_callback *cb)
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{
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struct smbus_stm32_data *data = dev->data;
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return smbus_callback_remove(&data->smbalert_callbacks, cb);
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}
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#endif /* CONFIG_SMBUS_STM32_SMBALERT */
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static int smbus_stm32_init(const struct device *dev)
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{
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const struct smbus_stm32_config *config = dev->config;
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struct smbus_stm32_data *data = dev->data;
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int result;
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data->dev = dev;
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if (!device_is_ready(config->i2c_dev)) {
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LOG_ERR("%s: I2C device is not ready", dev->name);
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return -ENODEV;
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}
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result = pinctrl_apply_state(config->pcfg, PINCTRL_STATE_DEFAULT);
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if (result < 0) {
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LOG_ERR("%s: pinctrl setup failed (%d)", dev->name, result);
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return result;
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}
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#ifdef CONFIG_SMBUS_STM32_SMBALERT
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k_work_init(&data->smbalert_work, smbus_stm32_smbalert_work);
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i2c_stm32_smbalert_set_callback(config->i2c_dev, smbus_stm32_smbalert_isr, dev);
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#endif /* CONFIG_SMBUS_STM32_SMBALERT */
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return 0;
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}
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static int smbus_stm32_configure(const struct device *dev, uint32_t config_value)
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{
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const struct smbus_stm32_config *config = dev->config;
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struct smbus_stm32_data *data = dev->data;
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if (config_value & SMBUS_MODE_PEC) {
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LOG_ERR("%s: not implemented", dev->name);
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return -EINVAL;
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}
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if (config_value & SMBUS_MODE_HOST_NOTIFY) {
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LOG_ERR("%s: not available", dev->name);
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return -EINVAL;
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}
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if (config_value & SMBUS_MODE_CONTROLLER) {
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LOG_DBG("%s: configuring SMB in host mode", dev->name);
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i2c_stm32_set_smbus_mode(config->i2c_dev, I2CSTM32MODE_SMBUSHOST);
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} else {
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LOG_DBG("%s: configuring SMB in device mode", dev->name);
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i2c_stm32_set_smbus_mode(config->i2c_dev, I2CSTM32MODE_SMBUSDEVICE);
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}
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if (config_value & SMBUS_MODE_SMBALERT) {
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LOG_DBG("%s: activating SMB alert", dev->name);
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i2c_stm32_smbalert_enable(config->i2c_dev);
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} else {
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LOG_DBG("%s: deactivating SMB alert", dev->name);
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i2c_stm32_smbalert_disable(config->i2c_dev);
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}
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data->config = config_value;
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return 0;
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}
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static int smbus_stm32_get_config(const struct device *dev, uint32_t *config)
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{
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struct smbus_stm32_data *data = dev->data;
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*config = data->config;
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return 0;
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}
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static int smbus_stm32_quick(const struct device *dev, uint16_t periph_addr,
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enum smbus_direction rw)
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{
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const struct smbus_stm32_config *config = dev->config;
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switch (rw) {
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case SMBUS_MSG_WRITE:
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return i2c_write(config->i2c_dev, NULL, 0, periph_addr);
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case SMBUS_MSG_READ:
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return i2c_read(config->i2c_dev, NULL, 0, periph_addr);
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default:
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LOG_ERR("%s: invalid smbus direction %i", dev->name, rw);
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return -EINVAL;
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}
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}
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static int smbus_stm32_byte_write(const struct device *dev, uint16_t periph_addr, uint8_t command)
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{
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const struct smbus_stm32_config *config = dev->config;
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return i2c_write(config->i2c_dev, &command, sizeof(command), periph_addr);
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}
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static int smbus_stm32_byte_read(const struct device *dev, uint16_t periph_addr, uint8_t *byte)
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{
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const struct smbus_stm32_config *config = dev->config;
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return i2c_read(config->i2c_dev, byte, sizeof(*byte), periph_addr);
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}
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static int smbus_stm32_byte_data_write(const struct device *dev, uint16_t periph_addr,
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uint8_t command, uint8_t byte)
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{
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const struct smbus_stm32_config *config = dev->config;
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uint8_t buffer[] = {
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command,
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byte,
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};
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return i2c_write(config->i2c_dev, buffer, ARRAY_SIZE(buffer), periph_addr);
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}
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static int smbus_stm32_byte_data_read(const struct device *dev, uint16_t periph_addr,
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uint8_t command, uint8_t *byte)
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{
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const struct smbus_stm32_config *config = dev->config;
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return i2c_write_read(config->i2c_dev, periph_addr, &command, sizeof(command), byte,
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sizeof(*byte));
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}
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static int smbus_stm32_word_data_write(const struct device *dev, uint16_t periph_addr,
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uint8_t command, uint16_t word)
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{
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const struct smbus_stm32_config *config = dev->config;
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uint8_t buffer[sizeof(command) + sizeof(word)];
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buffer[0] = command;
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sys_put_le16(word, buffer + 1);
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return i2c_write(config->i2c_dev, buffer, ARRAY_SIZE(buffer), periph_addr);
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}
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static int smbus_stm32_word_data_read(const struct device *dev, uint16_t periph_addr,
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uint8_t command, uint16_t *word)
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{
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const struct smbus_stm32_config *config = dev->config;
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int result;
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result = i2c_write_read(config->i2c_dev, periph_addr, &command, sizeof(command), word,
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sizeof(*word));
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*word = sys_le16_to_cpu(*word);
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return result;
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}
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static int smbus_stm32_pcall(const struct device *dev, uint16_t periph_addr, uint8_t command,
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uint16_t send_word, uint16_t *recv_word)
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{
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const struct smbus_stm32_config *config = dev->config;
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uint8_t buffer[sizeof(command) + sizeof(send_word)];
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int result;
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buffer[0] = command;
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sys_put_le16(send_word, buffer + 1);
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result = i2c_write_read(config->i2c_dev, periph_addr, buffer, ARRAY_SIZE(buffer), recv_word,
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sizeof(*recv_word));
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*recv_word = sys_le16_to_cpu(*recv_word);
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return result;
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}
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static int smbus_stm32_block_write(const struct device *dev, uint16_t periph_addr, uint8_t command,
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uint8_t count, uint8_t *buf)
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{
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const struct smbus_stm32_config *config = dev->config;
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struct i2c_msg messages[] = {
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{
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.buf = &command,
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.len = sizeof(command),
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.flags = 0,
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},
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{
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.buf = buf,
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.len = count,
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.flags = 0,
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},
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};
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return i2c_transfer(config->i2c_dev, messages, ARRAY_SIZE(messages), periph_addr);
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}
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static const struct smbus_driver_api smbus_stm32_api = {
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.configure = smbus_stm32_configure,
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.get_config = smbus_stm32_get_config,
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.smbus_quick = smbus_stm32_quick,
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.smbus_byte_write = smbus_stm32_byte_write,
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.smbus_byte_read = smbus_stm32_byte_read,
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.smbus_byte_data_write = smbus_stm32_byte_data_write,
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.smbus_byte_data_read = smbus_stm32_byte_data_read,
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.smbus_word_data_write = smbus_stm32_word_data_write,
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.smbus_word_data_read = smbus_stm32_word_data_read,
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.smbus_pcall = smbus_stm32_pcall,
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.smbus_block_write = smbus_stm32_block_write,
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#ifdef CONFIG_SMBUS_STM32_SMBALERT
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.smbus_smbalert_set_cb = smbus_stm32_smbalert_set_cb,
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.smbus_smbalert_remove_cb = smbus_stm32_smbalert_remove_cb,
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#else
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.smbus_smbalert_set_cb = NULL,
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.smbus_smbalert_remove_cb = NULL,
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#endif /* CONFIG_SMBUS_STM32_SMBALERT */
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.smbus_block_read = NULL,
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.smbus_block_pcall = NULL,
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.smbus_host_notify_set_cb = NULL,
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.smbus_host_notify_remove_cb = NULL,
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};
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#define DT_DRV_COMPAT st_stm32_smbus
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#define SMBUS_STM32_DEVICE_INIT(n) \
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PINCTRL_DT_INST_DEFINE(n); \
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static struct smbus_stm32_config smbus_stm32_config_##n = { \
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.i2c_dev = DEVICE_DT_GET(DT_INST_PROP(n, i2c)), \
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.pcfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n), \
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}; \
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\
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static struct smbus_stm32_data smbus_stm32_data_##n; \
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\
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SMBUS_DEVICE_DT_INST_DEFINE(n, smbus_stm32_init, NULL, &smbus_stm32_data_##n, \
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&smbus_stm32_config_##n, POST_KERNEL, \
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CONFIG_SMBUS_INIT_PRIORITY, &smbus_stm32_api);
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DT_INST_FOREACH_STATUS_OKAY(SMBUS_STM32_DEVICE_INIT)
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