net/ieee802154/wpan-class.c

   1 /*
   2  * Copyright (C) 2007, 2008, 2009 Siemens AG
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/device.h>
  22
  23 #include <net/wpan-phy.h>
  24
  25 #define MASTER_SHOW_COMPLEX(name, format_string, args...)               \
  26 static ssize_t name ## _show(struct device *dev,                        \
  27                             struct device_attribute *attr, char *buf)   \
  28 {                                                                       \
  29         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \
  30         int ret;                                                        \
  31                                                                         \
  32         mutex_lock(&phy->pib_lock);                                     \
  33         ret = sprintf(buf, format_string "\n", args);                   \
  34         mutex_unlock(&phy->pib_lock);                                   \
  35         return ret;                                                     \
  36 }
  37
  38 #define MASTER_SHOW(field, format_string)                               \
  39         MASTER_SHOW_COMPLEX(field, format_string, phy->field)
  40
  41 MASTER_SHOW(current_channel, "%d");
  42 MASTER_SHOW(current_page, "%d");
  43 MASTER_SHOW(channels_supported, "%#x");
  44 MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB",
  45         ((signed char) (phy->transmit_power << 2)) >> 2,
  46         (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
  47 MASTER_SHOW(cca_mode, "%d");
  48
  49 static struct device_attribute pmib_attrs[] = {
  50         __ATTR_RO(current_channel),
  51         __ATTR_RO(current_page),
  52         __ATTR_RO(channels_supported),
  53         __ATTR_RO(transmit_power),
  54         __ATTR_RO(cca_mode),
  55         {},
  56 };
  57
  58 static void wpan_phy_release(struct device *d)
  59 {
  60         struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
  61         kfree(phy);
  62 }
  63
  64 static struct class wpan_phy_class = {
  65         .name = "ieee802154",
  66         .dev_release = wpan_phy_release,
  67         .dev_attrs = pmib_attrs,
  68 };
  69
  70 static DEFINE_MUTEX(wpan_phy_mutex);
  71 static int wpan_phy_idx;
  72
  73 static int wpan_phy_match(struct device *dev, void *data)
  74 {
  75         return !strcmp(dev_name(dev), (const char *)data);
  76 }
  77
  78 struct wpan_phy *wpan_phy_find(const char *str)
  79 {
  80         struct device *dev;
  81
  82         if (WARN_ON(!str))
  83                 return NULL;
  84
  85         dev = class_find_device(&wpan_phy_class, NULL,
  86                         (void *)str, wpan_phy_match);
  87         if (!dev)
  88                 return NULL;
  89
  90         return container_of(dev, struct wpan_phy, dev);
  91 }
  92 EXPORT_SYMBOL(wpan_phy_find);
  93
  94 static int wpan_phy_idx_valid(int idx)
  95 {
  96         return idx >= 0;
  97 }
  98
  99 struct wpan_phy *wpan_phy_alloc(size_t priv_size)
 100 {
 101         struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
 102                         GFP_KERNEL);
 103
 104         mutex_lock(&wpan_phy_mutex);
 105         phy->idx = wpan_phy_idx++;
 106         if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
 107                 wpan_phy_idx--;
 108                 mutex_unlock(&wpan_phy_mutex);
 109                 kfree(phy);
 110                 return NULL;
 111         }
 112         mutex_unlock(&wpan_phy_mutex);
 113
 114         mutex_init(&phy->pib_lock);
 115
 116         device_initialize(&phy->dev);
 117         dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
 118
 119         phy->dev.class = &wpan_phy_class;
 120
 121         return phy;
 122 }
 123 EXPORT_SYMBOL(wpan_phy_alloc);
 124
 125 int wpan_phy_register(struct device *parent, struct wpan_phy *phy)
 126 {
 127         phy->dev.parent = parent;
 128
 129         return device_add(&phy->dev);
 130 }
 131 EXPORT_SYMBOL(wpan_phy_register);
 132
 133 void wpan_phy_unregister(struct wpan_phy *phy)
 134 {
 135         device_del(&phy->dev);
 136 }
 137 EXPORT_SYMBOL(wpan_phy_unregister);
 138
 139 void wpan_phy_free(struct wpan_phy *phy)
 140 {
 141         put_device(&phy->dev);
 142 }
 143 EXPORT_SYMBOL(wpan_phy_free);
 144
 145 static int __init wpan_phy_class_init(void)
 146 {
 147         return class_register(&wpan_phy_class);
 148 }
 149 subsys_initcall(wpan_phy_class_init);
 150
 151 static void __exit wpan_phy_class_exit(void)
 152 {
 153         class_unregister(&wpan_phy_class);
 154 }
 155 module_exit(wpan_phy_class_exit);
 156
 157 MODULE_DESCRIPTION("IEEE 802.15.4 device class");
 158 MODULE_LICENSE("GPL v2");
 159