142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
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* Copyright 2023 Cirrus Logic, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Emulator for SBS 1.1 compliant smart battery charger.
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*/
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#define DT_DRV_COMPAT sbs_sbs_charger
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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/logging/log.h>
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#include <zephyr/sys/byteorder.h>
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#include "sbs_charger.h"
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LOG_MODULE_REGISTER(sbs_sbs_charger);
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/** Static configuration for the emulator */
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struct sbs_charger_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_sbs_charger_reg_write(const struct emul *target, int reg, int val)
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{
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LOG_INF("write %x = %x", reg, val);
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switch (reg) {
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default:
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LOG_ERR("Unknown write %x", reg);
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return -EIO;
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}
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return 0;
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}
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static int emul_sbs_charger_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 SBS_CHARGER_REG_SPEC_INFO:
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case SBS_CHARGER_REG_CHARGER_MODE:
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case SBS_CHARGER_REG_STATUS:
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case SBS_CHARGER_REG_ALARM_WARNING:
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/* Arbitrary stub value. */
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*val = 1;
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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 sbs_charger_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_sbs_gauge.c */
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struct sbs_charger_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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i2c_dump_msgs_rw(target->dev, 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_sbs_charger_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_sbs_charger_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 sbs_charger_emul_api_i2c = {
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.transfer = sbs_charger_emul_transfer_i2c,
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};
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static int emul_sbs_sbs_charger_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. SBS Charger Emulator only implemented for I2C
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*/
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#define SBS_CHARGER_EMUL(n) \
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static const struct sbs_charger_emul_cfg sbs_charger_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_sbs_sbs_charger_init, NULL, &sbs_charger_emul_cfg_##n, \
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&sbs_charger_emul_api_i2c, NULL)
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DT_INST_FOREACH_STATUS_OKAY(SBS_CHARGER_EMUL)
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