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| 1 | /* |
| 2 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the Free |
| 6 | * Software Foundation; either version 2 of the License, or (at your option) |
| 7 | * any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 59 |
| 16 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | * |
| 18 | * The full GNU General Public License is included in this distribution in the |
| 19 | * file called COPYING. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/idr.h> |
| 26 | #include <linux/kdev_t.h> |
| 27 | #include <linux/err.h> |
| 28 | #include <linux/dca.h> |
| 29 | #include <linux/gfp.h> |
| 30 | #include <linux/export.h> |
| 31 | |
| 32 | static struct class *dca_class; |
| 33 | static struct idr dca_idr; |
| 34 | static spinlock_t dca_idr_lock; |
| 35 | |
| 36 | int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot) |
| 37 | { |
| 38 | struct device *cd; |
| 39 | static int req_count; |
| 40 | |
| 41 | cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL, |
| 42 | "requester%d", req_count++); |
| 43 | if (IS_ERR(cd)) |
| 44 | return PTR_ERR(cd); |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot) |
| 49 | { |
| 50 | device_destroy(dca_class, MKDEV(0, slot + 1)); |
| 51 | } |
| 52 | |
| 53 | int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) |
| 54 | { |
| 55 | struct device *cd; |
| 56 | int err = 0; |
| 57 | |
| 58 | idr_try_again: |
| 59 | if (!idr_pre_get(&dca_idr, GFP_KERNEL)) |
| 60 | return -ENOMEM; |
| 61 | spin_lock(&dca_idr_lock); |
| 62 | err = idr_get_new(&dca_idr, dca, &dca->id); |
| 63 | spin_unlock(&dca_idr_lock); |
| 64 | switch (err) { |
| 65 | case 0: |
| 66 | break; |
| 67 | case -EAGAIN: |
| 68 | goto idr_try_again; |
| 69 | default: |
| 70 | return err; |
| 71 | } |
| 72 | |
| 73 | cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id); |
| 74 | if (IS_ERR(cd)) { |
| 75 | spin_lock(&dca_idr_lock); |
| 76 | idr_remove(&dca_idr, dca->id); |
| 77 | spin_unlock(&dca_idr_lock); |
| 78 | return PTR_ERR(cd); |
| 79 | } |
| 80 | dca->cd = cd; |
| 81 | return 0; |
| 82 | } |
| 83 | |
| 84 | void dca_sysfs_remove_provider(struct dca_provider *dca) |
| 85 | { |
| 86 | device_unregister(dca->cd); |
| 87 | dca->cd = NULL; |
| 88 | spin_lock(&dca_idr_lock); |
| 89 | idr_remove(&dca_idr, dca->id); |
| 90 | spin_unlock(&dca_idr_lock); |
| 91 | } |
| 92 | |
| 93 | int __init dca_sysfs_init(void) |
| 94 | { |
| 95 | idr_init(&dca_idr); |
| 96 | spin_lock_init(&dca_idr_lock); |
| 97 | |
| 98 | dca_class = class_create(THIS_MODULE, "dca"); |
| 99 | if (IS_ERR(dca_class)) { |
| 100 | idr_destroy(&dca_idr); |
| 101 | return PTR_ERR(dca_class); |
| 102 | } |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | void __exit dca_sysfs_exit(void) |
| 107 | { |
| 108 | class_destroy(dca_class); |
| 109 | idr_destroy(&dca_idr); |
| 110 | } |
| 111 | |
| 112 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
