Release 4.11 drivers/misc/mic/bus/cosm_bus.c
/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2015 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Intel MIC COSM Bus Driver
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/idr.h>
#include "cosm_bus.h"
/* Unique numbering for cosm devices. */
static DEFINE_IDA(cosm_index_ida);
static int cosm_dev_probe(struct device *d)
{
struct cosm_device *dev = dev_to_cosm(d);
struct cosm_driver *drv = drv_to_cosm(dev->dev.driver);
return drv->probe(dev);
}
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static int cosm_dev_remove(struct device *d)
{
struct cosm_device *dev = dev_to_cosm(d);
struct cosm_driver *drv = drv_to_cosm(dev->dev.driver);
drv->remove(dev);
return 0;
}
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static struct bus_type cosm_bus = {
.name = "cosm_bus",
.probe = cosm_dev_probe,
.remove = cosm_dev_remove,
};
int cosm_register_driver(struct cosm_driver *driver)
{
driver->driver.bus = &cosm_bus;
return driver_register(&driver->driver);
}
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EXPORT_SYMBOL_GPL(cosm_register_driver);
void cosm_unregister_driver(struct cosm_driver *driver)
{
driver_unregister(&driver->driver);
}
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EXPORT_SYMBOL_GPL(cosm_unregister_driver);
static inline void cosm_release_dev(struct device *d)
{
struct cosm_device *cdev = dev_to_cosm(d);
kfree(cdev);
}
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struct cosm_device *
cosm_register_device(struct device *pdev, struct cosm_hw_ops *hw_ops)
{
struct cosm_device *cdev;
int ret;
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
if (!cdev)
return ERR_PTR(-ENOMEM);
cdev->dev.parent = pdev;
cdev->dev.release = cosm_release_dev;
cdev->hw_ops = hw_ops;
dev_set_drvdata(&cdev->dev, cdev);
cdev->dev.bus = &cosm_bus;
/* Assign a unique device index and hence name */
ret = ida_simple_get(&cosm_index_ida, 0, 0, GFP_KERNEL);
if (ret < 0)
goto free_cdev;
cdev->index = ret;
cdev->dev.id = ret;
dev_set_name(&cdev->dev, "cosm-dev%u", cdev->index);
ret = device_register(&cdev->dev);
if (ret)
goto ida_remove;
return cdev;
ida_remove:
ida_simple_remove(&cosm_index_ida, cdev->index);
free_cdev:
put_device(&cdev->dev);
return ERR_PTR(ret);
}
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EXPORT_SYMBOL_GPL(cosm_register_device);
void cosm_unregister_device(struct cosm_device *dev)
{
int index = dev->index; /* save for after device release */
device_unregister(&dev->dev);
ida_simple_remove(&cosm_index_ida, index);
}
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EXPORT_SYMBOL_GPL(cosm_unregister_device);
struct cosm_device *cosm_find_cdev_by_id(int id)
{
struct device *dev = subsys_find_device_by_id(&cosm_bus, id, NULL);
return dev ? container_of(dev, struct cosm_device, dev) : NULL;
}
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EXPORT_SYMBOL_GPL(cosm_find_cdev_by_id);
static int __init cosm_init(void)
{
return bus_register(&cosm_bus);
}
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static void __exit cosm_exit(void)
{
bus_unregister(&cosm_bus);
ida_destroy(&cosm_index_ida);
}
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core_initcall(cosm_init);
module_exit(cosm_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) MIC card OS state management bus driver");
MODULE_LICENSE("GPL v2");
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