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 = snprintf(buf, PAGE_SIZE, 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_COMPLEX(transmit_power, "%d +- %d dB",
  44         ((signed char) (phy->transmit_power << 2)) >> 2,
  45         (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
  46 MASTER_SHOW(cca_mode, "%d");
  47
  48 static ssize_t channels_supported_show(struct device *dev,
  49                             struct device_attribute *attr, char *buf)
  50 {
  51         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
  52         int ret;
  53         int i, len = 0;
  54
  55         mutex_lock(&phy->pib_lock);
  56         for (i = 0; i < 32; i++) {
  57                 ret = snprintf(buf + len, PAGE_SIZE - len,
  58                                 "%#09x\n", phy->channels_supported[i]);
  59                 if (ret < 0)
  60                         break;
  61                 len += ret;
  62         }
  63         mutex_unlock(&phy->pib_lock);
  64         return len;
  65 }
  66
  67 static struct device_attribute pmib_attrs[] = {
  68         __ATTR_RO(current_channel),
  69         __ATTR_RO(current_page),
  70         __ATTR_RO(channels_supported),
  71         __ATTR_RO(transmit_power),
  72         __ATTR_RO(cca_mode),
  73         {},
  74 };
  75
  76 static void wpan_phy_release(struct device *d)
  77 {
  78         struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
  79         kfree(phy);
  80 }
  81
  82 static struct class wpan_phy_class = {
  83         .name = "ieee802154",
  84         .dev_release = wpan_phy_release,
  85         .dev_attrs = pmib_attrs,
  86 };
  87
  88 static DEFINE_MUTEX(wpan_phy_mutex);
  89 static int wpan_phy_idx;
  90
  91 static int wpan_phy_match(struct device *dev, void *data)
  92 {
  93         return !strcmp(dev_name(dev), (const char *)data);
  94 }
  95
  96 struct wpan_phy *wpan_phy_find(const char *str)
  97 {
  98         struct device *dev;
  99
 100         if (WARN_ON(!str))
 101                 return NULL;
 102
 103         dev = class_find_device(&wpan_phy_class, NULL,
 104                         (void *)str, wpan_phy_match);
 105         if (!dev)
 106                 return NULL;
 107
 108         return container_of(dev, struct wpan_phy, dev);
 109 }
 110 EXPORT_SYMBOL(wpan_phy_find);
 111
 112 struct wpan_phy_iter_data {
 113         int (*fn)(struct wpan_phy *phy, void *data);
 114         void *data;
 115 };
 116
 117 static int wpan_phy_iter(struct device *dev, void *_data)
 118 {
 119         struct wpan_phy_iter_data *wpid = _data;
 120         struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
 121         return wpid->fn(phy, wpid->data);
 122 }
 123
 124 int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
 125                 void *data)
 126 {
 127         struct wpan_phy_iter_data wpid = {
 128                 .fn = fn,
 129                 .data = data,
 130         };
 131
 132         return class_for_each_device(&wpan_phy_class, NULL,
 133                         &wpid, wpan_phy_iter);
 134 }
 135 EXPORT_SYMBOL(wpan_phy_for_each);
 136
 137 static int wpan_phy_idx_valid(int idx)
 138 {
 139         return idx >= 0;
 140 }
 141
 142 struct wpan_phy *wpan_phy_alloc(size_t priv_size)
 143 {
 144         struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
 145                         GFP_KERNEL);
 146
 147         mutex_lock(&wpan_phy_mutex);
 148         phy->idx = wpan_phy_idx++;
 149         if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
 150                 wpan_phy_idx--;
 151                 mutex_unlock(&wpan_phy_mutex);
 152                 kfree(phy);
 153                 return NULL;
 154         }
 155         mutex_unlock(&wpan_phy_mutex);
 156
 157         mutex_init(&phy->pib_lock);
 158
 159         device_initialize(&phy->dev);
 160         dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
 161
 162         phy->dev.class = &wpan_phy_class;
 163
 164         phy->current_channel = -1; /* not initialised */
 165         phy->current_page = 0; /* for compatibility */
 166
 167         return phy;
 168 }
 169 EXPORT_SYMBOL(wpan_phy_alloc);
 170
 171 int wpan_phy_register(struct device *parent, struct wpan_phy *phy)
 172 {
 173         phy->dev.parent = parent;
 174
 175         return device_add(&phy->dev);
 176 }
 177 EXPORT_SYMBOL(wpan_phy_register);
 178
 179 void wpan_phy_unregister(struct wpan_phy *phy)
 180 {
 181         device_del(&phy->dev);
 182 }
 183 EXPORT_SYMBOL(wpan_phy_unregister);
 184
 185 void wpan_phy_free(struct wpan_phy *phy)
 186 {
 187         put_device(&phy->dev);
 188 }
 189 EXPORT_SYMBOL(wpan_phy_free);
 190
 191 static int __init wpan_phy_class_init(void)
 192 {
 193         return class_register(&wpan_phy_class);
 194 }
 195 subsys_initcall(wpan_phy_class_init);
 196
 197 static void __exit wpan_phy_class_exit(void)
 198 {
 199         class_unregister(&wpan_phy_class);
 200 }
 201 module_exit(wpan_phy_class_exit);
 202
 203 MODULE_DESCRIPTION("IEEE 802.15.4 device class");
 204 MODULE_LICENSE("GPL v2");
 205