linux/drivers/uwb/pal.c
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   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                ret = sysfs_create_link(&pal->device->kobj,
  48                                        &rc->uwb_dev.dev.kobj, "uwb_rc");
  49                if (ret < 0)
  50                        return ret;
  51                ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
  52                                        &pal->device->kobj, pal->name);
  53                if (ret < 0) {
  54                        sysfs_remove_link(&pal->device->kobj, "uwb_rc");
  55                        return ret;
  56                }
  57        }
  58
  59        pal->debugfs_dir = uwb_dbg_create_pal_dir(pal);
  60
  61        mutex_lock(&rc->uwb_dev.mutex);
  62        list_add(&pal->node, &rc->pals);
  63        mutex_unlock(&rc->uwb_dev.mutex);
  64
  65        return 0;
  66}
  67EXPORT_SYMBOL_GPL(uwb_pal_register);
  68
  69/**
  70 * uwb_pal_register - unregister a UWB PAL
  71 * @pal: the PAL
  72 */
  73void uwb_pal_unregister(struct uwb_pal *pal)
  74{
  75        struct uwb_rc *rc = pal->rc;
  76
  77        uwb_radio_stop(pal);
  78
  79        mutex_lock(&rc->uwb_dev.mutex);
  80        list_del(&pal->node);
  81        mutex_unlock(&rc->uwb_dev.mutex);
  82
  83        debugfs_remove(pal->debugfs_dir);
  84
  85        if (pal->device) {
  86                sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
  87                sysfs_remove_link(&pal->device->kobj, "uwb_rc");
  88        }
  89}
  90EXPORT_SYMBOL_GPL(uwb_pal_unregister);
  91
  92/**
  93 * uwb_rc_pal_init - initialize the PAL related parts of a radio controller
  94 * @rc: the radio controller
  95 */
  96void uwb_rc_pal_init(struct uwb_rc *rc)
  97{
  98        INIT_LIST_HEAD(&rc->pals);
  99}
 100
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