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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_pi3usb9201_emul
#include <device.h>
#include <emul.h>
#include <drivers/i2c.h>
#include <drivers/i2c_emul.h>
#include "emul/emul_pi3usb9201.h"
#include <logging/log.h>
LOG_MODULE_REGISTER(emul_pi3usb9201, LOG_LEVEL_DBG);
#define EMUL_REG_COUNT (PI3USB9201_REG_HOST_STS + 1)
#define EMUL_REG_IS_VALID(reg) (reg >= 0 && reg < EMUL_REG_COUNT)
/** Run-time data used by the emulator */
struct pi3usb9201_emul_data {
/** I2C emulator detail */
struct i2c_emul emul;
/** pi3usb9201 device being emulated */
const struct device *i2c;
/** Configuration information */
const struct pi3usb9201_emul_cfg *cfg;
/** Current state of all emulated pi3usb9201 registers */
uint8_t reg[EMUL_REG_COUNT];
};
/** Static configuration for the emulator */
struct pi3usb9201_emul_cfg {
/** Label of the I2C bus this emulator connects to */
const char *i2c_label;
/** Pointer to run-time data */
struct pi3usb9201_emul_data *data;
/** Address of pi3usb9201 on i2c bus */
uint16_t addr;
};
int pi3usb9201_emul_set_reg(struct i2c_emul *emul, int reg, uint8_t val)
{
struct pi3usb9201_emul_data *data;
if (!EMUL_REG_IS_VALID(reg))
return -EIO;
data = CONTAINER_OF(emul, struct pi3usb9201_emul_data, emul);
data->reg[reg] = val;
return 0;
}
int pi3usb9201_emul_get_reg(struct i2c_emul *emul, int reg, uint8_t *val)
{
struct pi3usb9201_emul_data *data;
if (!EMUL_REG_IS_VALID(reg))
return -EIO;
data = CONTAINER_OF(emul, struct pi3usb9201_emul_data, emul);
*val = data->reg[reg];
return 0;
}
static void pi3usb9201_emul_reset(struct i2c_emul *emul)
{
struct pi3usb9201_emul_data *data;
data = CONTAINER_OF(emul, struct pi3usb9201_emul_data, emul);
data->reg[PI3USB9201_REG_CTRL_1] = 0;
data->reg[PI3USB9201_REG_CTRL_2] = 0;
data->reg[PI3USB9201_REG_CLIENT_STS] = 0;
data->reg[PI3USB9201_REG_HOST_STS] = 0;
}
/**
* Emulate an I2C transfer to a pi3usb9201
*
* This handles simple reads and writes
*
* @param emul I2C emulation information
* @param msgs List of messages to process
* @param num_msgs Number of messages to process
* @param addr Address of the I2C target device
*
* @retval 0 If successful
* @retval -EIO General input / output error
*/
static int pi3usb9201_emul_transfer(struct i2c_emul *emul, struct i2c_msg *msgs,
int num_msgs, int addr)
{
const struct pi3usb9201_emul_cfg *cfg;
struct pi3usb9201_emul_data *data;
data = CONTAINER_OF(emul, struct pi3usb9201_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 pi3usb9201_emul_set_reg(emul, msgs[0].buf[0],
msgs[0].buf[1]);
} else if (num_msgs == 2) {
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;
}
return pi3usb9201_emul_get_reg(emul, msgs[0].buf[0],
&(msgs[1].buf[0]));
} else {
LOG_ERR("Unexpected num_msgs");
return -EIO;
}
}
/* Device instantiation */
static struct i2c_emul_api pi3usb9201_emul_api = {
.transfer = pi3usb9201_emul_transfer,
};
/**
* @brief Set up a new pi3usb9201 emulator
*
* This should be called for each pi3usb9201 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 pi3usb9201_emul_init(const struct emul *emul,
const struct device *parent)
{
const struct pi3usb9201_emul_cfg *cfg = emul->cfg;
struct pi3usb9201_emul_data *data = cfg->data;
int ret;
data->emul.api = &pi3usb9201_emul_api;
data->emul.addr = cfg->addr;
data->i2c = parent;
data->cfg = cfg;
ret = i2c_emul_register(parent, emul->dev_label, &data->emul);
pi3usb9201_emul_reset(&data->emul);
return ret;
}
#define PI3USB9201_EMUL(n) \
static struct pi3usb9201_emul_data pi3usb9201_emul_data_##n = {}; \
static const struct pi3usb9201_emul_cfg pi3usb9201_emul_cfg_##n = { \
.i2c_label = DT_INST_BUS_LABEL(n), \
.data = &pi3usb9201_emul_data_##n, \
.addr = DT_INST_REG_ADDR(n), \
}; \
EMUL_DEFINE(pi3usb9201_emul_init, DT_DRV_INST(n), \
&pi3usb9201_emul_cfg_##n, &pi3usb9201_emul_data_##n)
DT_INST_FOREACH_STATUS_OKAY(PI3USB9201_EMUL)
#define PI3USB9201_EMUL_CASE(n) \
case DT_INST_DEP_ORD(n): return &pi3usb9201_emul_data_##n.emul;
struct i2c_emul *pi3usb9201_emul_get(int ord)
{
switch (ord) {
DT_INST_FOREACH_STATUS_OKAY(PI3USB9201_EMUL_CASE)
default:
return NULL;
}
}
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