112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
|
/*
|
||
|
|
* Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License as published by the Free
|
||
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
||
|
|
* any later version.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
||
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||
|
|
* more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License along with
|
||
|
|
* this program; if not, write to the Free Software Foundation, Inc., 59
|
||
|
|
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||
|
|
*
|
||
|
|
* The full GNU General Public License is included in this distribution in the
|
||
|
|
* file called COPYING.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/idr.h>
|
||
|
|
#include <linux/kdev_t.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/dca.h>
|
||
|
|
#include <linux/gfp.h>
|
||
|
|
#include <linux/export.h>
|
||
|
|
|
||
|
|
static struct class *dca_class;
|
||
|
|
static struct idr dca_idr;
|
||
|
|
static spinlock_t dca_idr_lock;
|
||
|
|
|
||
|
|
int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
|
||
|
|
{
|
||
|
|
struct device *cd;
|
||
|
|
static int req_count;
|
||
|
|
|
||
|
|
cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
|
||
|
|
"requester%d", req_count++);
|
||
|
|
if (IS_ERR(cd))
|
||
|
|
return PTR_ERR(cd);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
|
||
|
|
{
|
||
|
|
device_destroy(dca_class, MKDEV(0, slot + 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
|
||
|
|
{
|
||
|
|
struct device *cd;
|
||
|
|
int err = 0;
|
||
|
|
|
||
|
|
idr_try_again:
|
||
|
|
if (!idr_pre_get(&dca_idr, GFP_KERNEL))
|
||
|
|
return -ENOMEM;
|
||
|
|
spin_lock(&dca_idr_lock);
|
||
|
|
err = idr_get_new(&dca_idr, dca, &dca->id);
|
||
|
|
spin_unlock(&dca_idr_lock);
|
||
|
|
switch (err) {
|
||
|
|
case 0:
|
||
|
|
break;
|
||
|
|
case -EAGAIN:
|
||
|
|
goto idr_try_again;
|
||
|
|
default:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
|
||
|
|
if (IS_ERR(cd)) {
|
||
|
|
spin_lock(&dca_idr_lock);
|
||
|
|
idr_remove(&dca_idr, dca->id);
|
||
|
|
spin_unlock(&dca_idr_lock);
|
||
|
|
return PTR_ERR(cd);
|
||
|
|
}
|
||
|
|
dca->cd = cd;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void dca_sysfs_remove_provider(struct dca_provider *dca)
|
||
|
|
{
|
||
|
|
device_unregister(dca->cd);
|
||
|
|
dca->cd = NULL;
|
||
|
|
spin_lock(&dca_idr_lock);
|
||
|
|
idr_remove(&dca_idr, dca->id);
|
||
|
|
spin_unlock(&dca_idr_lock);
|
||
|
|
}
|
||
|
|
|
||
|
|
int __init dca_sysfs_init(void)
|
||
|
|
{
|
||
|
|
idr_init(&dca_idr);
|
||
|
|
spin_lock_init(&dca_idr_lock);
|
||
|
|
|
||
|
|
dca_class = class_create(THIS_MODULE, "dca");
|
||
|
|
if (IS_ERR(dca_class)) {
|
||
|
|
idr_destroy(&dca_idr);
|
||
|
|
return PTR_ERR(dca_class);
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void __exit dca_sysfs_exit(void)
|
||
|
|
{
|
||
|
|
class_destroy(dca_class);
|
||
|
|
idr_destroy(&dca_idr);
|
||
|
|
}
|
||
|
|
|