linux/drivers/dca/dca-sysfs.c
<<
>>
Prefs
   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 err = 0;
  57
  58idr_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
  84void 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
  93int __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
 106void __exit dca_sysfs_exit(void)
 107{
 108        class_destroy(dca_class);
 109        idr_destroy(&dca_idr);
 110}
 111
 112
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.