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/* Copyright 2021 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#define DT_DRV_COMPAT zephyr_syv682x_emul
#include <device.h>
#include <emul.h>
#include <drivers/i2c.h>
#include <drivers/i2c_emul.h>
#define LOG_LEVEL CONFIG_I2C_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(syv682x);
#include <stdint.h>
#include <string.h>
#include "emul/emul_syv682x.h"
#define EMUL_REG_COUNT (SYV682X_CONTROL_4_REG + 1)
#define EMUL_REG_IS_VALID(reg) (reg >= 0 && reg < EMUL_REG_COUNT)
struct syv682x_emul_data {
/** I2C emulator detail */
struct i2c_emul emul;
/** Smart battery device being emulated */
const struct device *i2c;
/** Configuration information */
const struct syv682x_emul_cfg *cfg;
/** Current state of all emulated SYV682x registers */
uint8_t reg[EMUL_REG_COUNT];
/**
* Current state of conditions affecting interrupt bits, as distinct
* from the current values of those bits stored in reg.
*/
uint8_t status_cond;
uint8_t control_4_cond;
};
/** Static configuration for the emulator */
struct syv682x_emul_cfg {
/** Label of the I2C bus this emulator connects to */
const char *i2c_label;
/** Address of smart battery on i2c bus */
uint16_t addr;
/** Pointer to runtime data */
struct syv682x_emul_data *data;
};
int syv682x_emul_set_reg(struct i2c_emul *emul, int reg, uint8_t val)
{
struct syv682x_emul_data *data;
if (!EMUL_REG_IS_VALID(reg))
return -EIO;
data = CONTAINER_OF(emul, struct syv682x_emul_data, emul);
data->reg[reg] = val;
return 0;
}
void syv682x_emul_set_status(struct i2c_emul *emul, uint8_t val)
{
struct syv682x_emul_data *data;
data = CONTAINER_OF(emul, struct syv682x_emul_data, emul);
data->status_cond = val;
data->reg[SYV682X_STATUS_REG] |= val;
}
int syv682x_emul_get_reg(struct i2c_emul *emul, int reg, uint8_t *val)
{
struct syv682x_emul_data *data;
if (!EMUL_REG_IS_VALID(reg))
return -EIO;
data = CONTAINER_OF(emul, struct syv682x_emul_data, emul);
*val = data->reg[reg];
return 0;
}
/**
* Emulate an I2C transfer to an SYV682x. This handles simple reads and writes.
*
* @param emul I2C emulation information
* @param msgs List of messages to process. For 'read' messages, this function
* updates the 'buf' member with the data that was read
* @param num_msgs Number of messages to process
* @param addr Address of the I2C target device.
*
* @return 0 on success, -EIO on general input / output error
*/
static int syv682x_emul_transfer(struct i2c_emul *emul, struct i2c_msg *msgs,
int num_msgs, int addr)
{
const struct syv682x_emul_cfg *cfg;
struct syv682x_emul_data *data;
data = CONTAINER_OF(emul, struct syv682x_emul_data, emul);
cfg = data->cfg;
if (cfg->addr != addr) {
LOG_ERR("Address mismatch, expected %02x, got %02x", cfg->addr,
addr);
return -EIO;
}
i2c_dump_msgs("emul", msgs, num_msgs, addr);
if (num_msgs == 1) {
if (!((msgs[0].flags & I2C_MSG_RW_MASK) == I2C_MSG_WRITE
&& msgs[0].len == 2)) {
LOG_ERR("Unexpected write msgs");
return -EIO;
}
return syv682x_emul_set_reg(emul, msgs[0].buf[0],
msgs[0].buf[1]);
} else if (num_msgs == 2) {
int ret;
int reg;
uint8_t *buf;
if (!((msgs[0].flags & I2C_MSG_RW_MASK) == I2C_MSG_WRITE
&& msgs[0].len == 1
&& (msgs[1].flags & I2C_MSG_RW_MASK) ==
I2C_MSG_READ
&& (msgs[1].len == 1))) {
LOG_ERR("Unexpected read msgs");
return -EIO;
}
reg = msgs[0].buf[0];
buf = &msgs[1].buf[0];
ret = syv682x_emul_get_reg(emul, reg, buf);
switch (reg) {
/*
* These registers are clear-on-read (if the underlying
* condition has cleared).
*/
case SYV682X_STATUS_REG:
syv682x_emul_set_reg(emul, reg, data->status_cond);
break;
case SYV682X_CONTROL_4_REG:
syv682x_emul_set_reg(emul, reg, data->control_4_cond);
break;
default:
break;
}
return ret;
} else {
LOG_ERR("Unexpected num_msgs");
return -EIO;
}
}
/* Device instantiation */
static struct i2c_emul_api syv682x_emul_api = {
.transfer = syv682x_emul_transfer,
};
/**
* @brief Set up a new SYV682x emulator
*
* This should be called for each SYV682x device that needs to be emulated. It
* registers it with the I2C emulation controller.
*
* @param emul Emulation information
* @param parent Device to emulate
*
* @return 0 indicating success (always)
*/
static int syv682x_emul_init(const struct emul *emul,
const struct device *parent)
{
const struct syv682x_emul_cfg *cfg = emul->cfg;
struct syv682x_emul_data *data = cfg->data;
int ret;
data->emul.api = &syv682x_emul_api;
data->emul.addr = cfg->addr;
data->i2c = parent;
data->cfg = cfg;
memset(data->reg, 0, sizeof(data->reg));
ret = i2c_emul_register(parent, emul->dev_label, &data->emul);
return ret;
}
#define SYV682X_EMUL(n) \
static struct syv682x_emul_data syv682x_emul_data_##n = {}; \
static const struct syv682x_emul_cfg syv682x_emul_cfg_##n = { \
.i2c_label = DT_INST_BUS_LABEL(n), \
.data = &syv682x_emul_data_##n, \
.addr = DT_INST_REG_ADDR(n), \
}; \
EMUL_DEFINE(syv682x_emul_init, DT_DRV_INST(n), &syv682x_emul_cfg_##n, \
&syv682x_emul_data_##n)
DT_INST_FOREACH_STATUS_OKAY(SYV682X_EMUL)
#define SYV682X_EMUL_CASE(n) \
case DT_INST_DEP_ORD(n): return &syv682x_emul_data_##n.emul;
struct i2c_emul *syv682x_emul_get(int ord)
{
switch (ord) {
DT_INST_FOREACH_STATUS_OKAY(SYV682X_EMUL_CASE)
default:
return NULL;
}
}
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