linux/drivers/dca/dca-sysfs.c
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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
  32static struct class *dca_class;
  33static struct idr dca_idr;
  34static spinlock_t dca_idr_lock;
  35
  36int 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
  48void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
  49{
  50        device_destroy(dca_class, MKDEV(0, slot + 1));
  51}
  52
  53int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
  54{
  55        struct device *cd;
  56        int ret;
  57
  58        idr_preload(GFP_KERNEL);
  59        spin_lock(&dca_idr_lock);
  60
  61        ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
  62        if (ret >= 0)
  63                dca->id = ret;
  64
  65        spin_unlock(&dca_idr_lock);
  66        idr_preload_end();
  67        if (ret < 0)
  68                return ret;
  69
  70        cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
  71        if (IS_ERR(cd)) {
  72                spin_lock(&dca_idr_lock);
  73                idr_remove(&dca_idr, dca->id);
  74                spin_unlock(&dca_idr_lock);
  75                return PTR_ERR(cd);
  76        }
  77        dca->cd = cd;
  78        return 0;
  79}
  80
  81void dca_sysfs_remove_provider(struct dca_provider *dca)
  82{
  83        device_unregister(dca->cd);
  84        dca->cd = NULL;
  85        spin_lock(&dca_idr_lock);
  86        idr_remove(&dca_idr, dca->id);
  87        spin_unlock(&dca_idr_lock);
  88}
  89
  90int __init dca_sysfs_init(void)
  91{
  92        idr_init(&dca_idr);
  93        spin_lock_init(&dca_idr_lock);
  94
  95        dca_class = class_create(THIS_MODULE, "dca");
  96        if (IS_ERR(dca_class)) {
  97                idr_destroy(&dca_idr);
  98                return PTR_ERR(dca_class);
  99        }
 100        return 0;
 101}
 102
 103void __exit dca_sysfs_exit(void)
 104{
 105        class_destroy(dca_class);
 106        idr_destroy(&dca_idr);
 107}
 108
 109
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