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/slab.h> 20#include <linux/kernel.h> 21#include <linux/module.h> 22#include <linux/device.h> 23 24#include <net/wpan-phy.h> 25 26#include "ieee802154.h" 27 28#define MASTER_SHOW_COMPLEX(name, format_string, args...) \ 29static ssize_t name ## _show(struct device *dev, \ 30 struct device_attribute *attr, char *buf) \ 31{ \ 32 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \ 33 int ret; \ 34 \ 35 mutex_lock(&phy->pib_lock); \ 36 ret = snprintf(buf, PAGE_SIZE, format_string "\n", args); \ 37 mutex_unlock(&phy->pib_lock); \ 38 return ret; \ 39} 40 41#define MASTER_SHOW(field, format_string) \ 42 MASTER_SHOW_COMPLEX(field, format_string, phy->field) 43 44MASTER_SHOW(current_channel, "%d"); 45MASTER_SHOW(current_page, "%d"); 46MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB", 47 ((signed char) (phy->transmit_power << 2)) >> 2, 48 (phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 ); 49MASTER_SHOW(cca_mode, "%d"); 50 51static ssize_t channels_supported_show(struct device *dev, 52 struct device_attribute *attr, char *buf) 53{ 54 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); 55 int ret; 56 int i, len = 0; 57 58 mutex_lock(&phy->pib_lock); 59 for (i = 0; i < 32; i++) { 60 ret = snprintf(buf + len, PAGE_SIZE - len, 61 "%#09x\n", phy->channels_supported[i]); 62 if (ret < 0) 63 break; 64 len += ret; 65 } 66 mutex_unlock(&phy->pib_lock); 67 return len; 68} 69 70static struct device_attribute pmib_attrs[] = { 71 __ATTR_RO(current_channel), 72 __ATTR_RO(current_page), 73 __ATTR_RO(channels_supported), 74 __ATTR_RO(transmit_power), 75 __ATTR_RO(cca_mode), 76 {}, 77}; 78 79static void wpan_phy_release(struct device *d) 80{ 81 struct wpan_phy *phy = container_of(d, struct wpan_phy, dev); 82 kfree(phy); 83} 84 85static struct class wpan_phy_class = { 86 .name = "ieee802154", 87 .dev_release = wpan_phy_release, 88 .dev_attrs = pmib_attrs, 89}; 90 91static DEFINE_MUTEX(wpan_phy_mutex); 92static int wpan_phy_idx; 93 94static int wpan_phy_match(struct device *dev, const void *data) 95{ 96 return !strcmp(dev_name(dev), (const char *)data); 97} 98 99struct wpan_phy *wpan_phy_find(const char *str) 100{ 101 struct device *dev; 102 103 if (WARN_ON(!str)) 104 return NULL; 105 106 dev = class_find_device(&wpan_phy_class, NULL, str, wpan_phy_match); 107 if (!dev) 108 return NULL; 109 110 return container_of(dev, struct wpan_phy, dev); 111} 112EXPORT_SYMBOL(wpan_phy_find); 113 114struct wpan_phy_iter_data { 115 int (*fn)(struct wpan_phy *phy, void *data); 116 void *data; 117}; 118 119static int wpan_phy_iter(struct device *dev, void *_data) 120{ 121 struct wpan_phy_iter_data *wpid = _data; 122 struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); 123 return wpid->fn(phy, wpid->data); 124} 125 126int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data), 127 void *data) 128{ 129 struct wpan_phy_iter_data wpid = { 130 .fn = fn, 131 .data = data, 132 }; 133 134 return class_for_each_device(&wpan_phy_class, NULL, 135 &wpid, wpan_phy_iter); 136} 137EXPORT_SYMBOL(wpan_phy_for_each); 138 139static int wpan_phy_idx_valid(int idx) 140{ 141 return idx >= 0; 142} 143 144struct wpan_phy *wpan_phy_alloc(size_t priv_size) 145{ 146 struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size, 147 GFP_KERNEL); 148 149 if (!phy) 150 goto out; 151 mutex_lock(&wpan_phy_mutex); 152 phy->idx = wpan_phy_idx++; 153 if (unlikely(!wpan_phy_idx_valid(phy->idx))) { 154 wpan_phy_idx--; 155 mutex_unlock(&wpan_phy_mutex); 156 kfree(phy); 157 goto out; 158 } 159 mutex_unlock(&wpan_phy_mutex); 160 161 mutex_init(&phy->pib_lock); 162 163 device_initialize(&phy->dev); 164 dev_set_name(&phy->dev, "wpan-phy%d", phy->idx); 165 166 phy->dev.class = &wpan_phy_class; 167 168 phy->current_channel = -1; /* not initialised */ 169 phy->current_page = 0; /* for compatibility */ 170 171 return phy; 172 173out: 174 return NULL; 175} 176EXPORT_SYMBOL(wpan_phy_alloc); 177 178int wpan_phy_register(struct wpan_phy *phy) 179{ 180 return device_add(&phy->dev); 181} 182EXPORT_SYMBOL(wpan_phy_register); 183 184void wpan_phy_unregister(struct wpan_phy *phy) 185{ 186 device_del(&phy->dev); 187} 188EXPORT_SYMBOL(wpan_phy_unregister); 189 190void wpan_phy_free(struct wpan_phy *phy) 191{ 192 put_device(&phy->dev); 193} 194EXPORT_SYMBOL(wpan_phy_free); 195 196static int __init wpan_phy_class_init(void) 197{ 198 int rc; 199 rc = class_register(&wpan_phy_class); 200 if (rc) 201 goto err; 202 203 rc = ieee802154_nl_init(); 204 if (rc) 205 goto err_nl; 206 207 return 0; 208err_nl: 209 class_unregister(&wpan_phy_class); 210err: 211 return rc; 212} 213subsys_initcall(wpan_phy_class_init); 214 215static void __exit wpan_phy_class_exit(void) 216{ 217 ieee802154_nl_exit(); 218 class_unregister(&wpan_phy_class); 219} 220module_exit(wpan_phy_class_exit); 221 222MODULE_LICENSE("GPL v2"); 223MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface"); 224MODULE_AUTHOR("Dmitry Eremin-Solenikov"); 225 226