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// SPDX-License-Identifier: GPL-2.0
/*
* vchiq_device.c - VCHIQ generic device and bus-type
*
* Copyright (c) 2023 Ideas On Board Oy
*/
#include <linux/device/bus.h>
#include <linux/dma-mapping.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "vchiq_bus.h"
static int vchiq_bus_type_match(struct device *dev, struct device_driver *drv)
{
if (dev->bus == &vchiq_bus_type &&
strcmp(dev_name(dev), drv->name) == 0)
return true;
return false;
}
static int vchiq_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
const struct vchiq_device *device = container_of_const(dev, struct vchiq_device, dev);
return add_uevent_var(env, "MODALIAS=vchiq:%s", dev_name(&device->dev));
}
static int vchiq_bus_probe(struct device *dev)
{
struct vchiq_device *device = to_vchiq_device(dev);
struct vchiq_driver *driver = to_vchiq_driver(dev->driver);
return driver->probe(device);
}
const struct bus_type vchiq_bus_type = {
.name = "vchiq-bus",
.match = vchiq_bus_type_match,
.uevent = vchiq_bus_uevent,
.probe = vchiq_bus_probe,
};
static void vchiq_device_release(struct device *dev)
{
struct vchiq_device *device = to_vchiq_device(dev);
kfree(device);
}
struct vchiq_device *
vchiq_device_register(struct device *parent, const char *name)
{
struct vchiq_device *device;
int ret;
device = kzalloc(sizeof(*device), GFP_KERNEL);
if (!device)
return NULL;
device->dev.init_name = name;
device->dev.parent = parent;
device->dev.bus = &vchiq_bus_type;
device->dev.dma_mask = &device->dev.coherent_dma_mask;
device->dev.release = vchiq_device_release;
of_dma_configure(&device->dev, parent->of_node, true);
ret = device_register(&device->dev);
if (ret) {
dev_err(parent, "Cannot register %s: %d\n", name, ret);
put_device(&device->dev);
return NULL;
}
return device;
}
void vchiq_device_unregister(struct vchiq_device *vchiq_dev)
{
device_unregister(&vchiq_dev->dev);
}
int vchiq_driver_register(struct vchiq_driver *vchiq_drv)
{
vchiq_drv->driver.bus = &vchiq_bus_type;
return driver_register(&vchiq_drv->driver);
}
EXPORT_SYMBOL_GPL(vchiq_driver_register);
void vchiq_driver_unregister(struct vchiq_driver *vchiq_drv)
{
driver_unregister(&vchiq_drv->driver);
}
EXPORT_SYMBOL_GPL(vchiq_driver_unregister);
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