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90 lines
1.8 KiB
90 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/spinlock.h> |
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#include <linux/device.h> |
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#include <linux/idr.h> |
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#include <linux/kdev_t.h> |
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#include <linux/err.h> |
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#include <linux/dca.h> |
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#include <linux/gfp.h> |
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#include <linux/export.h> |
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static struct class *dca_class; |
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static struct idr dca_idr; |
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static spinlock_t dca_idr_lock; |
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int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot) |
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{ |
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struct device *cd; |
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static int req_count; |
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cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL, |
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"requester%d", req_count++); |
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return PTR_ERR_OR_ZERO(cd); |
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} |
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void dca_sysfs_remove_req(struct dca_provider *dca, int slot) |
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{ |
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device_destroy(dca_class, MKDEV(0, slot + 1)); |
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} |
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int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) |
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{ |
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struct device *cd; |
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int ret; |
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idr_preload(GFP_KERNEL); |
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spin_lock(&dca_idr_lock); |
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ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT); |
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if (ret >= 0) |
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dca->id = ret; |
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spin_unlock(&dca_idr_lock); |
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idr_preload_end(); |
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if (ret < 0) |
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return ret; |
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cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id); |
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if (IS_ERR(cd)) { |
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spin_lock(&dca_idr_lock); |
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idr_remove(&dca_idr, dca->id); |
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spin_unlock(&dca_idr_lock); |
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return PTR_ERR(cd); |
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} |
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dca->cd = cd; |
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return 0; |
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} |
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void dca_sysfs_remove_provider(struct dca_provider *dca) |
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{ |
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device_unregister(dca->cd); |
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dca->cd = NULL; |
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spin_lock(&dca_idr_lock); |
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idr_remove(&dca_idr, dca->id); |
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spin_unlock(&dca_idr_lock); |
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} |
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int __init dca_sysfs_init(void) |
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{ |
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idr_init(&dca_idr); |
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spin_lock_init(&dca_idr_lock); |
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dca_class = class_create(THIS_MODULE, "dca"); |
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if (IS_ERR(dca_class)) { |
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idr_destroy(&dca_idr); |
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return PTR_ERR(dca_class); |
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} |
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return 0; |
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} |
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void __exit dca_sysfs_exit(void) |
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{ |
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class_destroy(dca_class); |
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idr_destroy(&dca_idr); |
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} |
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