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/* Copyright 2022 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <string.h>
#include <zephyr/device.h>
#include "basic_i2c_device_emul.h"
#include "emul/emul_common_i2c.h"
#include "emul/emul_stub_device.h"
#define DT_DRV_COMPAT basic_i2c_device
void basic_i2c_device_reset(const struct emul *emul)
{
struct basic_i2c_device_data *data =
(struct basic_i2c_device_data *)emul->data;
memset(data->regs, 0, sizeof(data->regs));
memset(data->extended_regs, 0, sizeof(data->extended_regs));
}
static int basic_i2c_device_write(const struct emul *emul, int reg, uint8_t val,
int bytes, void *unused_data)
{
struct basic_i2c_device_data *data =
(struct basic_i2c_device_data *)emul->data;
uint8_t *regs;
if (data->regs[BASIC_I2C_DEV_EXT_ACCESS_REG]) {
/* Accessing the extended register set */
regs = data->extended_regs;
/* Decrement one to account for the extended access reg byte */
reg = data->regs[BASIC_I2C_DEV_EXT_ACCESS_REG] - 1;
} else {
regs = data->regs;
}
int pos = reg + bytes - 1;
if (!IN_RANGE(pos, 0, sizeof(data->regs) - 1)) {
return -1;
}
regs[pos] = val;
return 0;
}
static int basic_i2c_device_read(const struct emul *emul, int reg, uint8_t *val,
int bytes, void *unused_data)
{
struct basic_i2c_device_data *data =
(struct basic_i2c_device_data *)emul->data;
uint8_t *regs;
if (data->regs[BASIC_I2C_DEV_EXT_ACCESS_REG]) {
/* Accessing the extended register set */
regs = data->extended_regs;
reg = data->regs[BASIC_I2C_DEV_EXT_ACCESS_REG];
} else {
regs = data->regs;
}
int pos = reg + bytes;
if (!IN_RANGE(pos, 0, sizeof(data->regs) - 1)) {
return -1;
}
*val = regs[pos];
return 0;
}
static int basic_i2c_device_init(const struct emul *emul,
const struct device *parent)
{
struct basic_i2c_device_data *data =
(struct basic_i2c_device_data *)emul->data;
struct i2c_common_emul_data *common_data = &data->common;
i2c_common_emul_init(common_data);
i2c_common_emul_set_read_func(common_data, basic_i2c_device_read, NULL);
i2c_common_emul_set_write_func(common_data, basic_i2c_device_write,
NULL);
basic_i2c_device_reset(emul);
return 0;
}
#define INIT_BASIC_I2C_DEVICE_EMUL(n) \
static struct i2c_common_emul_cfg common_cfg_##n; \
static struct basic_i2c_device_data basic_i2c_device_data_##n; \
static struct i2c_common_emul_cfg common_cfg_##n = { \
.dev_label = DT_NODE_FULL_NAME(DT_DRV_INST(n)), \
.data = &basic_i2c_device_data_##n.common, \
.addr = DT_INST_REG_ADDR(n) \
}; \
static struct basic_i2c_device_data basic_i2c_device_data_##n = { \
.common = { .cfg = &common_cfg_##n } \
}; \
EMUL_DT_INST_DEFINE(n, basic_i2c_device_init, \
&basic_i2c_device_data_##n, &common_cfg_##n, \
&i2c_common_emul_api)
DT_INST_FOREACH_STATUS_OKAY(INIT_BASIC_I2C_DEVICE_EMUL);
DT_INST_FOREACH_STATUS_OKAY(EMUL_STUB_DEVICE);
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