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| 2 | |
| 3 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
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| 4 |
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| 5 |
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| 6 | #include <linux/kernel.h>
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| 7 | #include <linux/spinlock.h>
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| 8 | #include <linux/device.h>
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| 9 | #include <linux/idr.h>
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| 10 | #include <linux/kdev_t.h>
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| 11 | #include <linux/err.h>
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| 12 | #include <linux/dca.h>
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| 13 | #include <linux/gfp.h>
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| 14 | #include <linux/export.h>
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| 15 |
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| 16 | static const struct class dca_class = {
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| 17 | .name = "dca",
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| 18 | };
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| 19 | static struct idr dca_idr;
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| 20 | static spinlock_t dca_idr_lock;
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| 21 |
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| 22 | int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
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| 23 | {
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| 24 | struct device *cd;
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| 25 | static int req_count;
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| 26 |
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| 27 | cd = device_create(&dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
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| 28 | "requester%d", req_count++);
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| 29 | return PTR_ERR_OR_ZERO(cd);
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| 30 | }
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| 31 |
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| 32 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
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| 33 | {
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| 34 | device_destroy(&dca_class, MKDEV(0, slot + 1));
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| 35 | }
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| 36 |
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| 37 | int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
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| 38 | {
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| 39 | struct device *cd;
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| 40 | int ret;
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| 41 |
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| 42 | idr_preload(GFP_KERNEL);
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| 43 | spin_lock(&dca_idr_lock);
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| 44 |
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| 45 | ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
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| 46 | if (ret >= 0)
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| 47 | dca->id = ret;
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| 48 |
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| 49 | spin_unlock(&dca_idr_lock);
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| 50 | idr_preload_end();
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| 51 | if (ret < 0)
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| 52 | return ret;
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| 53 |
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| 54 | cd = device_create(&dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
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| 55 | if (IS_ERR(cd)) {
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| 56 | spin_lock(&dca_idr_lock);
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| 57 | idr_remove(&dca_idr, dca->id);
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| 58 | spin_unlock(&dca_idr_lock);
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| 59 | return PTR_ERR(cd);
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| 60 | }
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| 61 | dca->cd = cd;
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| 62 | return 0;
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| 63 | }
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| 64 |
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| 65 | void dca_sysfs_remove_provider(struct dca_provider *dca)
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| 66 | {
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| 67 | device_unregister(dca->cd);
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| 68 | dca->cd = NULL;
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| 69 | spin_lock(&dca_idr_lock);
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| 70 | idr_remove(&dca_idr, dca->id);
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| 71 | spin_unlock(&dca_idr_lock);
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| 72 | }
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| 73 |
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| 74 | int __init dca_sysfs_init(void)
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| 75 | {
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| 76 | int err;
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| 77 |
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| 78 | idr_init(&dca_idr);
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| 79 | spin_lock_init(&dca_idr_lock);
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| 80 |
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| 81 | err = class_register(&dca_class);
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| 82 | if (err) {
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| 83 | idr_destroy(&dca_idr);
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| 84 | return err;
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| 85 | }
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| 86 | return 0;
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| 87 | }
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| 88 |
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| 89 | void __exit dca_sysfs_exit(void)
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| 90 | {
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| 91 | class_unregister(&dca_class);
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| 92 | idr_destroy(&dca_idr);
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| 93 | }
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| 94 |
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