d0816a1a60
Links and the manufacturer name are updated from maxim to analog for the 1-wire subsystem and the related ds18b20 sensor. After the acquisition of Maxim Integrated the documentation of these devices has been moved to the analog.com website. Redirects exist, so they are not broken yet, but we should not rely on that. Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>
115 lines
3.1 KiB
C
115 lines
3.1 KiB
C
/*
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* Copyright (c) 2022 Thomas Stranger
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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 maxim_ds2485
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/**
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* @brief Driver for the Analog Devices DS2485 1-Wire Master
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*/
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#include "w1_ds2477_85_common.h"
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/w1.h>
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#include <zephyr/kernel.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(w1_ds2485, CONFIG_W1_LOG_LEVEL);
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/* upper limits; guaranteed over operating temperature range */
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#define DS2485_T_OSCWUP_us 1000U
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#define DS2485_T_OP_us 400U
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#define DS2485_T_SEQ_us 10U
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int ds2485_w1_script_cmd(const struct device *dev, int w1_delay_us, uint8_t w1_cmd,
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const uint8_t *tx_buf, const uint8_t tx_len,
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uint8_t *rx_buf, uint8_t rx_len)
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{
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const struct w1_ds2477_85_config *cfg = dev->config;
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uint8_t i2c_len = 3 + tx_len;
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uint8_t tx_bytes[3 + SCRIPT_WR_LEN] = {
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CMD_W1_SCRIPT, tx_len + CMD_W1_SCRIPT_LEN, w1_cmd
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};
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uint8_t rx_bytes[3];
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struct i2c_msg rx_msg[2] = {
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{
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.buf = rx_bytes,
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.len = (CMD_W1_SCRIPT_LEN + CMD_OVERHEAD_LEN),
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.flags = I2C_MSG_READ,
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},
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{
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.buf = rx_buf,
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.len = rx_len,
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.flags = (I2C_MSG_READ | I2C_MSG_STOP),
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},
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};
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int ret;
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__ASSERT_NO_MSG(tx_len <= SCRIPT_WR_LEN);
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memcpy(&tx_bytes[3], tx_buf, tx_len);
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ret = i2c_write_dt(&cfg->i2c_spec, tx_bytes, i2c_len);
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if (ret < 0) {
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return ret;
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}
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k_usleep(DS2485_T_OP_us + DS2485_T_SEQ_us + w1_delay_us);
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ret = i2c_transfer_dt(&cfg->i2c_spec, rx_msg, 2);
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if (ret < 0) {
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LOG_ERR("scripts_cmd fail: ret: %x", ret);
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return ret;
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}
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if ((rx_bytes[0] != (rx_len + 2)) || (rx_bytes[2] != w1_cmd)) {
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LOG_ERR("scripts_cmd fail: response: %x,%x:",
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rx_bytes[0], rx_bytes[2]);
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return -EIO;
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}
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return rx_bytes[1];
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}
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static int w1_ds2485_init(const struct device *dev)
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{
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const struct w1_ds2477_85_config *cfg = dev->config;
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if (!device_is_ready(cfg->i2c_spec.bus)) {
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LOG_ERR("%s is not ready", cfg->i2c_spec.bus->name);
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return -ENODEV;
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}
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if (ds2477_85_reset_master(dev)) {
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return -EIO;
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}
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k_usleep(DS2485_T_OSCWUP_us);
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return w1_ds2477_85_init(dev);
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}
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static const struct w1_driver_api w1_ds2485_driver_api = {
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.reset_bus = ds2477_85_reset_bus,
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.read_bit = ds2477_85_read_bit,
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.write_bit = ds2477_85_write_bit,
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.read_byte = ds2477_85_read_byte,
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.write_byte = ds2477_85_write_byte,
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.read_block = ds2477_85_read_block,
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.write_block = ds2477_85_write_block,
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.configure = ds2477_85_configure,
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};
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#define W1_DS2485_INIT(inst) \
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static const struct w1_ds2477_85_config w1_ds2477_85_cfg_##inst = \
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W1_DS2477_85_DT_CONFIG_INST_GET(inst, DS2485_T_OP_us, \
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DS2485_T_SEQ_us, \
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ds2485_w1_script_cmd); \
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\
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static struct w1_ds2477_85_data w1_ds2477_85_data_##inst = {}; \
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DEVICE_DT_INST_DEFINE(inst, &w1_ds2485_init, NULL, \
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&w1_ds2477_85_data_##inst, \
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&w1_ds2477_85_cfg_##inst, POST_KERNEL, \
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CONFIG_W1_INIT_PRIORITY, &w1_ds2485_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(W1_DS2485_INIT)
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