2759adaf1a
This is a squash of all the groundwork needed to get a functioning driver for the DS3231 with the RTC API. Signed-off-by: Gergo Vari <work@gergovari.com>
77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/*
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* Copyright (c) 2024 Gergo Vari <work@gergovari.com>
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/drivers/mfd/ds3231.h>
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#include <zephyr/kernel.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(mfd_ds3231, CONFIG_MFD_LOG_LEVEL);
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#define DT_DRV_COMPAT maxim_ds3231_mfd
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struct mfd_ds3231_data {
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struct k_sem lock;
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const struct device *dev;
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};
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struct mfd_ds3231_conf {
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struct i2c_dt_spec i2c_bus;
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};
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int mfd_ds3231_i2c_get_registers(const struct device *dev, uint8_t start_reg, uint8_t *buf,
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const size_t buf_size)
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{
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struct mfd_ds3231_data *data = dev->data;
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const struct mfd_ds3231_conf *config = dev->config;
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/* FIXME: bad start_reg/buf_size values break i2c for that run */
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(void)k_sem_take(&data->lock, K_FOREVER);
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int err = i2c_burst_read_dt(&config->i2c_bus, start_reg, buf, buf_size);
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k_sem_give(&data->lock);
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return err;
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}
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int mfd_ds3231_i2c_set_registers(const struct device *dev, uint8_t start_reg, const uint8_t *buf,
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const size_t buf_size)
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{
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struct mfd_ds3231_data *data = dev->data;
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const struct mfd_ds3231_conf *config = dev->config;
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(void)k_sem_take(&data->lock, K_FOREVER);
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int err = i2c_burst_write_dt(&config->i2c_bus, start_reg, buf, buf_size);
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k_sem_give(&data->lock);
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return err;
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}
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static int mfd_ds3231_init(const struct device *dev)
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{
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struct mfd_ds3231_data *data = dev->data;
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const struct mfd_ds3231_conf *config = (struct mfd_ds3231_conf *)(dev->config);
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k_sem_init(&data->lock, 1, 1);
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if (!i2c_is_ready_dt(&(config->i2c_bus))) {
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LOG_ERR("I2C bus not ready.");
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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 MFD_DS3231_DEFINE(inst) \
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static const struct mfd_ds3231_conf config##inst = {.i2c_bus = \
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I2C_DT_SPEC_INST_GET(inst)}; \
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static struct mfd_ds3231_data data##inst; \
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DEVICE_DT_INST_DEFINE(inst, &mfd_ds3231_init, NULL, &data##inst, &config##inst, \
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POST_KERNEL, CONFIG_MFD_INIT_PRIORITY, NULL);
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DT_INST_FOREACH_STATUS_OKAY(MFD_DS3231_DEFINE)
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