LXR linux/drivers/uwb/pal.c

   1/*
   2 * UWB PAL support.
   3 *
   4 * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License version
   8 * 2 as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18#include <linux/kernel.h>
  19#include <linux/debugfs.h>
  20#include <linux/uwb.h>
  21#include <linux/export.h>
  22
  23#include "uwb-internal.h"
  24
  25/**
  26 * uwb_pal_init - initialize a UWB PAL
  27 * @pal: the PAL to initialize
  28 */
  29void uwb_pal_init(struct uwb_pal *pal)
  30{
  31        INIT_LIST_HEAD(&pal->node);
  32}
  33EXPORT_SYMBOL_GPL(uwb_pal_init);
  34
  35/**
  36 * uwb_pal_register - register a UWB PAL
  37 * @pal: the PAL
  38 *
  39 * The PAL must be initialized with uwb_pal_init().
  40 */
  41int uwb_pal_register(struct uwb_pal *pal)
  42{
  43        struct uwb_rc *rc = pal->rc;
  44        int ret;
  45
  46        if (pal->device) {
  47                /* create a link to the uwb_rc in the PAL device's directory. */
  48                ret = sysfs_create_link(&pal->device->kobj,
  49                                        &rc->uwb_dev.dev.kobj, "uwb_rc");
  50                if (ret < 0)
  51                        return ret;
  52                /* create a link to the PAL in the UWB device's directory. */
  53                ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
  54                                        &pal->device->kobj, pal->name);
  55                if (ret < 0) {
  56                        sysfs_remove_link(&pal->device->kobj, "uwb_rc");
  57                        return ret;
  58                }
  59        }
  60
  61        pal->debugfs_dir = uwb_dbg_create_pal_dir(pal);
  62
  63        mutex_lock(&rc->uwb_dev.mutex);
  64        list_add(&pal->node, &rc->pals);
  65        mutex_unlock(&rc->uwb_dev.mutex);
  66
  67        return 0;
  68}
  69EXPORT_SYMBOL_GPL(uwb_pal_register);
  70
  71/**
  72 * uwb_pal_register - unregister a UWB PAL
  73 * @pal: the PAL
  74 */
  75void uwb_pal_unregister(struct uwb_pal *pal)
  76{
  77        struct uwb_rc *rc = pal->rc;
  78
  79        uwb_radio_stop(pal);
  80
  81        mutex_lock(&rc->uwb_dev.mutex);
  82        list_del(&pal->node);
  83        mutex_unlock(&rc->uwb_dev.mutex);
  84
  85        debugfs_remove(pal->debugfs_dir);
  86
  87        if (pal->device) {
  88                sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
  89                sysfs_remove_link(&pal->device->kobj, "uwb_rc");
  90        }
  91}
  92EXPORT_SYMBOL_GPL(uwb_pal_unregister);
  93
  94/**
  95 * uwb_rc_pal_init - initialize the PAL related parts of a radio controller
  96 * @rc: the radio controller
  97 */
  98void uwb_rc_pal_init(struct uwb_rc *rc)
  99{
 100        INIT_LIST_HEAD(&rc->pals);
 101}
 102