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
  22 #include "uwb-internal.h"
  23
  24 /**
  25  * uwb_pal_init - initialize a UWB PAL
  26  * @pal: the PAL to initialize
  27  */
  28 void uwb_pal_init(struct uwb_pal *pal)
  29 {
  30         INIT_LIST_HEAD(&pal->node);
  31 }
  32 EXPORT_SYMBOL_GPL(uwb_pal_init);
  33
  34 /**
  35  * uwb_pal_register - register a UWB PAL
  36  * @pal: the PAL
  37  *
  38  * The PAL must be initialized with uwb_pal_init().
  39  */
  40 int uwb_pal_register(struct uwb_pal *pal)
  41 {
  42         struct uwb_rc *rc = pal->rc;
  43         int ret;
  44
  45         if (pal->device) {
  46                 ret = sysfs_create_link(&pal->device->kobj,
  47                                         &rc->uwb_dev.dev.kobj, "uwb_rc");
  48                 if (ret < 0)
  49                         return ret;
  50                 ret = sysfs_create_link(&rc->uwb_dev.dev.kobj,
  51                                         &pal->device->kobj, pal->name);
  52                 if (ret < 0) {
  53                         sysfs_remove_link(&pal->device->kobj, "uwb_rc");
  54                         return ret;
  55                 }
  56         }
  57
  58         pal->debugfs_dir = uwb_dbg_create_pal_dir(pal);
  59
  60         mutex_lock(&rc->uwb_dev.mutex);
  61         list_add(&pal->node, &rc->pals);
  62         mutex_unlock(&rc->uwb_dev.mutex);
  63
  64         return 0;
  65 }
  66 EXPORT_SYMBOL_GPL(uwb_pal_register);
  67
  68 /**
  69  * uwb_pal_register - unregister a UWB PAL
  70  * @pal: the PAL
  71  */
  72 void uwb_pal_unregister(struct uwb_pal *pal)
  73 {
  74         struct uwb_rc *rc = pal->rc;
  75
  76         uwb_radio_stop(pal);
  77
  78         mutex_lock(&rc->uwb_dev.mutex);
  79         list_del(&pal->node);
  80         mutex_unlock(&rc->uwb_dev.mutex);
  81
  82         debugfs_remove(pal->debugfs_dir);
  83
  84         if (pal->device) {
  85                 sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name);
  86                 sysfs_remove_link(&pal->device->kobj, "uwb_rc");
  87         }
  88 }
  89 EXPORT_SYMBOL_GPL(uwb_pal_unregister);
  90
  91 /**
  92  * uwb_rc_pal_init - initialize the PAL related parts of a radio controller
  93  * @rc: the radio controller
  94  */
  95 void uwb_rc_pal_init(struct uwb_rc *rc)
  96 {
  97         INIT_LIST_HEAD(&rc->pals);
  98 }