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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-02-25 GuEe-GUI the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "mfd.rpi-sense"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include "rpi-sense.h"
static rt_int32_t i2c_smbus_read_byte_data(struct rt_i2c_client *client,
rt_uint8_t command)
{
rt_int32_t res;
rt_uint8_t ret = 0;
struct rt_i2c_msg msg[2];
msg[0].buf = &command;
msg[0].addr = client->client_addr;
msg[0].len = 1;
msg[0].flags = RT_I2C_WR;
msg[1].buf = &ret;
msg[1].addr = client->client_addr;
msg[1].len = 1;
msg[1].flags = RT_I2C_RD;
res = rt_i2c_transfer(client->bus, msg, 2);
return res == 2 ? ret : res;
}
rt_int32_t rpisense_reg_read(struct rpisense *rpisense, int reg)
{
rt_int32_t ret = i2c_smbus_read_byte_data(rpisense->i2c_client, reg);
if (ret < 0)
{
LOG_E("Read from reg(%d) error = %s", reg, rt_strerror(ret));
}
/*
* As the BCM270x I2C clock stretching bug, some values may have MSB set.
* Clear it to avoid incorrect values.
*/
return ret & 0x7f;
}
rt_ssize_t rpisense_block_write(struct rpisense *rpisense, const char *buf, int count)
{
rt_ssize_t ret;
struct rt_i2c_client *client = rpisense->i2c_client;
ret = rt_i2c_master_send(client->bus, client->client_addr, 0, (void *)buf, count);
if (ret < 0)
{
LOG_E("Write block(%d) error = %s", count, rt_strerror(ret));
}
return ret;
}
static void rpisense_client_dev_register(struct rpisense *rpisense,
const char *name, struct rt_platform_device *pdev)
{
pdev->name = name;
pdev->priv = rpisense;
rt_platform_device_register(pdev);
}
static rt_err_t rpisense_probe(struct rt_i2c_client *client)
{
rt_err_t err;
rt_int32_t value;
struct rt_device *dev = &client->parent;
struct rpisense *rpisense = rt_calloc(1, sizeof(*rpisense));
if (!rpisense)
{
return -RT_ENOMEM;
}
rpisense->i2c_client = client;
value = rpisense_reg_read(rpisense, RPISENSE_WAI);
if (value > 0)
{
if (value != RPISENSE_ID)
{
err = -RT_EINVAL;
goto _fail;
}
}
else
{
err = value;
goto _fail;
}
value = rpisense_reg_read(rpisense, RPISENSE_VER);
if (value < 0)
{
err = value;
goto _fail;
}
LOG_I("Raspberry Pi Sense HAT firmware version %i", value);
dev->user_data = rpisense;
rpisense_client_dev_register(rpisense, "rpi-sense-js", &rpisense->joystick_dev);
rpisense_client_dev_register(rpisense, "rpi-sense-fb", &rpisense->framebuffer_dev);
return RT_EOK;
_fail:
rt_free(rpisense);
return err;
}
static rt_err_t rpisense_remove(struct rt_i2c_client *client)
{
struct rpisense *rpisense = client->parent.user_data;
rt_bus_remove_device(&rpisense->joystick_dev.parent);
rt_bus_remove_device(&rpisense->framebuffer_dev.parent);
rt_free(rpisense);
return RT_EOK;
}
static const struct rt_i2c_device_id rpisense_ids[] =
{
{ .name = "rpi-sense" },
{ /* sentinel */ },
};
static const struct rt_ofw_node_id rpisense_ofw_ids[] =
{
{ .compatible = "rpi,rpi-sense" },
{ /* sentinel */ },
};
static struct rt_i2c_driver rpisense_driver =
{
.ids = rpisense_ids,
.ofw_ids = rpisense_ofw_ids,
.probe = rpisense_probe,
.remove = rpisense_remove,
};
RT_I2C_DRIVER_EXPORT(rpisense_driver);
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