rt-thread/components/drivers/i2c/i2c_bus.c

183 lines
4.2 KiB
C

/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-12-06 GuEe-GUI first version
*/
#include <rtdevice.h>
#define DBG_TAG "i2c.bus"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
static struct rt_bus i2c_bus;
void i2c_bus_scan_clients(struct rt_i2c_bus_device *bus)
{
#ifdef RT_USING_OFW
if (bus->parent.ofw_node)
{
struct rt_ofw_node *np = bus->parent.ofw_node, *child_np, *i2c_client_np;
rt_ofw_foreach_available_child_node(np, child_np)
{
rt_uint32_t client_addr;
struct rt_i2c_client *client;
if (rt_ofw_prop_read_bool(child_np, "compatible"))
{
i2c_client_np = child_np;
}
else
{
/* Maybe in i2c-mux */
i2c_client_np = rt_ofw_get_next_child(child_np, RT_NULL);
if (!rt_ofw_prop_read_bool(i2c_client_np, "compatible"))
{
continue;
}
}
client = rt_calloc(1, sizeof(*client));
if (!client)
{
rt_ofw_node_put(i2c_client_np);
LOG_E("Not memory to create i2c client: %s",
rt_ofw_node_full_name(i2c_client_np));
return;
}
rt_ofw_prop_read_u32(i2c_client_np, "reg", &client_addr);
client->parent.ofw_node = i2c_client_np;
client->name = rt_ofw_node_name(i2c_client_np);
client->bus = bus;
client->client_addr = client_addr;
rt_i2c_device_register(client);
if (i2c_client_np != child_np)
{
rt_ofw_node_put(i2c_client_np);
}
}
}
#endif /* RT_USING_OFW */
}
rt_err_t rt_i2c_driver_register(struct rt_i2c_driver *driver)
{
RT_ASSERT(driver != RT_NULL);
driver->parent.bus = &i2c_bus;
return rt_driver_register(&driver->parent);
}
rt_err_t rt_i2c_device_register(struct rt_i2c_client *client)
{
RT_ASSERT(client != RT_NULL);
return rt_bus_add_device(&i2c_bus, &client->parent);
}
static rt_bool_t i2c_match(rt_driver_t drv, rt_device_t dev)
{
const struct rt_i2c_device_id *id;
struct rt_i2c_driver *driver = rt_container_of(drv, struct rt_i2c_driver, parent);
struct rt_i2c_client *client = rt_container_of(dev, struct rt_i2c_client, parent);
if ((id = driver->ids))
{
for (; id->name[0]; ++id)
{
if (!rt_strcmp(id->name, client->name))
{
client->id = id;
client->ofw_id = RT_NULL;
return RT_TRUE;
}
}
}
#ifdef RT_USING_OFW
client->ofw_id = rt_ofw_node_match(client->parent.ofw_node, driver->ofw_ids);
if (client->ofw_id)
{
client->id = RT_NULL;
return RT_TRUE;
}
#endif
return RT_FALSE;
}
static rt_err_t i2c_probe(rt_device_t dev)
{
rt_err_t err;
struct rt_i2c_driver *driver = rt_container_of(dev->drv, struct rt_i2c_driver, parent);
struct rt_i2c_client *client = rt_container_of(dev, struct rt_i2c_client, parent);
if (!client->bus)
{
return -RT_EINVAL;
}
err = driver->probe(client);
return err;
}
static rt_err_t i2c_remove(rt_device_t dev)
{
struct rt_i2c_driver *driver = rt_container_of(dev->drv, struct rt_i2c_driver, parent);
struct rt_i2c_client *client = rt_container_of(dev, struct rt_i2c_client, parent);
if (driver && driver->remove)
{
driver->remove(client);
}
return RT_EOK;
}
static rt_err_t i2c_shutdown(rt_device_t dev)
{
struct rt_i2c_driver *driver = rt_container_of(dev->drv, struct rt_i2c_driver, parent);
struct rt_i2c_client *client = rt_container_of(dev, struct rt_i2c_client, parent);
if (driver && driver->shutdown)
{
driver->shutdown(client);
}
return RT_EOK;
}
static struct rt_bus i2c_bus =
{
.name = "i2c",
.match = i2c_match,
.probe = i2c_probe,
.remove = i2c_remove,
.shutdown = i2c_shutdown,
};
static int i2c_bus_init(void)
{
rt_bus_register(&i2c_bus);
return 0;
}
INIT_CORE_EXPORT(i2c_bus_init);