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maxpowelnashif
maxpowel
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nashif
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drivers: Added fuel gauge max17048
Added support for fuel gauge max17048 Signed-off-by: Alvaro Garcia <maxpowel@gmail.com>
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‎drivers/fuel_gauge/CMakeLists.txt

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# SPDX-License-Identifier: Apache-2.0
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add_subdirectory_ifdef(CONFIG_SBS_GAUGE_NEW_API sbs_gauge)
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add_subdirectory_ifdef(CONFIG_MAX17048 max17048)
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zephyr_library_sources_ifdef(CONFIG_USERSPACE fuel_gauge_syscall_handlers.c)

‎drivers/fuel_gauge/Kconfig

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help
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Battery fuel gauge initialization priority.
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source "drivers/fuel_gauge/max17048/Kconfig"
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source "drivers/fuel_gauge/sbs_gauge/Kconfig"
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endif # FUEL_GAUGE

‎drivers/fuel_gauge/max17048/CMakeLists.txt

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# SPDX-License-Identifier: Apache-2.0
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zephyr_library()
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zephyr_library_sources(max17048.c)
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zephyr_include_directories_ifdef(CONFIG_EMUL_MAX17048 .)
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zephyr_library_sources_ifdef(CONFIG_EMUL_MAX17048 ./emul_max17048.c)

‎drivers/fuel_gauge/max17048/Kconfig

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# MAX17048 Li-Ion battery fuel gauge
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# Copyright (c) 2023, Alvaro Garcia <maxpowel@gmail.com>
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# SPDX-License-Identifier: Apache-2.0
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config MAX17048
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bool "MAX17048 Li-Po fuel gauge"
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default y
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depends on DT_HAS_MAXIM_MAX17048_ENABLED
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select I2C
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help
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Enable driver for the MAX17048 fuel gauge device.
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config EMUL_MAX17048
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bool "Emulate an MAX17048 fuel gague"
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depends on EMUL
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help
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It provides readings which follow a simple sequence, thus allowing
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test code to check that things are working as expected.

‎drivers/fuel_gauge/max17048/emul_max17048.c

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/*
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* Copyright 2023, Alvaro Garcia <maxpowel@gmail.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Emulator for max17048 fuel gauge
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*/
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#define DT_DRV_COMPAT maxim_max17048
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(maxim_max17048);
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#include <zephyr/device.h>
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#include <zephyr/drivers/emul.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/drivers/i2c_emul.h>
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#include <zephyr/sys/byteorder.h>
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#include "max17048.h"
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/** Static configuration for the emulator */
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struct max17048_emul_cfg {
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/** I2C address of emulator */
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uint16_t addr;
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};
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static int emul_max17048_reg_write(const struct emul *target, int reg, int val)
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{
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return -EIO;
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}
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static int emul_max17048_reg_read(const struct emul *target, int reg, int *val)
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{
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switch (reg) {
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case REGISTER_VERSION:
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*val = 0x1000;
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break;
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case REGISTER_CRATE:
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*val = 0x4000;
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break;
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case REGISTER_SOC:
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*val = 0x3525;
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break;
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case REGISTER_VCELL:
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*val = 0x4387;
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break;
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default:
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LOG_ERR("Unknown register 0x%x read", reg);
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return -EIO;
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}
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LOG_INF("read 0x%x = 0x%x", reg, *val);
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return 0;
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}
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static int max17048_emul_transfer_i2c(const struct emul *target, struct i2c_msg *msgs,
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int num_msgs, int addr)
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{
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/* Largely copied from emul_bmi160.c */
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struct max17048_emul_data *data;
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unsigned int val;
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int reg;
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int rc;
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data = target->data;
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__ASSERT_NO_MSG(msgs && num_msgs);
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i2c_dump_msgs_rw("emul", msgs, num_msgs, addr, false);
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switch (num_msgs) {
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case 2:
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if (msgs->flags & I2C_MSG_READ) {
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LOG_ERR("Unexpected read");
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return -EIO;
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}
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if (msgs->len != 1) {
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LOG_ERR("Unexpected msg0 length %d", msgs->len);
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return -EIO;
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}
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reg = msgs->buf[0];
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/* Now process the 'read' part of the message */
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msgs++;
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if (msgs->flags & I2C_MSG_READ) {
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switch (msgs->len - 1) {
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case 1:
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rc = emul_max17048_reg_read(target, reg, &val);
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if (rc) {
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/* Return before writing bad value to message buffer */
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return rc;
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}
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/* SBS uses SMBus, which sends data in little-endian format. */
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sys_put_le16(val, msgs->buf);
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break;
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default:
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LOG_ERR("Unexpected msg1 length %d", msgs->len);
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return -EIO;
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}
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} else {
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/* We write a word (2 bytes by the SBS spec) */
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if (msgs->len != 2) {
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LOG_ERR("Unexpected msg1 length %d", msgs->len);
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}
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uint16_t value = sys_get_le16(msgs->buf);
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rc = emul_max17048_reg_write(target, reg, value);
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}
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break;
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default:
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LOG_ERR("Invalid number of messages: %d", num_msgs);
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return -EIO;
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}
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return rc;
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}
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static const struct i2c_emul_api max17048_emul_api_i2c = {
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.transfer = max17048_emul_transfer_i2c,
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};
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/**
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* Set up a new emulator (I2C)
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*
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* @param emul Emulation information
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* @param parent Device to emulate
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* @return 0 indicating success (always)
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*/
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static int emul_max17048_init(const struct emul *target, const struct device *parent)
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{
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ARG_UNUSED(target);
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ARG_UNUSED(parent);
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return 0;
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}
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/*
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* Main instantiation macro.
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*/
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#define MAX17048_EMUL(n) \
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static const struct max17048_emul_cfg max17048_emul_cfg_##n = { \
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.addr = DT_INST_REG_ADDR(n), \
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}; \
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EMUL_DT_INST_DEFINE(n, emul_max17048_init, NULL, \
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&max17048_emul_cfg_##n, &max17048_emul_api_i2c, NULL)
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DT_INST_FOREACH_STATUS_OKAY(MAX17048_EMUL)

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