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