drivers/isdn/mISDN/core.c

   1 /*
   2  * Copyright 2008  by Karsten Keil <kkeil@novell.com>
   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 as
   6  * 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  */
  14
  15 #include <linux/slab.h>
  16 #include <linux/types.h>
  17 #include <linux/stddef.h>
  18 #include <linux/module.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/mISDNif.h>
  21 #include "core.h"
  22
  23 static u_int debug;
  24
  25 MODULE_AUTHOR("Karsten Keil");
  26 MODULE_LICENSE("GPL");
  27 module_param(debug, uint, S_IRUGO | S_IWUSR);
  28
  29 static u64              device_ids;
  30 #define MAX_DEVICE_ID   63
  31
  32 static LIST_HEAD(Bprotocols);
  33 static DEFINE_RWLOCK(bp_lock);
  34
  35 static void mISDN_dev_release(struct device *dev)
  36 {
  37         /* nothing to do: the device is part of its parent's data structure */
  38 }
  39
  40 static ssize_t _show_id(struct device *dev,
  41                         struct device_attribute *attr, char *buf)
  42 {
  43         struct mISDNdevice *mdev = dev_to_mISDN(dev);
  44
  45         if (!mdev)
  46                 return -ENODEV;
  47         return sprintf(buf, "%d\n", mdev->id);
  48 }
  49
  50 static ssize_t _show_nrbchan(struct device *dev,
  51                              struct device_attribute *attr, char *buf)
  52 {
  53         struct mISDNdevice *mdev = dev_to_mISDN(dev);
  54
  55         if (!mdev)
  56                 return -ENODEV;
  57         return sprintf(buf, "%d\n", mdev->nrbchan);
  58 }
  59
  60 static ssize_t _show_d_protocols(struct device *dev,
  61                                  struct device_attribute *attr, char *buf)
  62 {
  63         struct mISDNdevice *mdev = dev_to_mISDN(dev);
  64
  65         if (!mdev)
  66                 return -ENODEV;
  67         return sprintf(buf, "%d\n", mdev->Dprotocols);
  68 }
  69
  70 static ssize_t _show_b_protocols(struct device *dev,
  71                                  struct device_attribute *attr, char *buf)
  72 {
  73         struct mISDNdevice *mdev = dev_to_mISDN(dev);
  74
  75         if (!mdev)
  76                 return -ENODEV;
  77         return sprintf(buf, "%d\n", mdev->Bprotocols | get_all_Bprotocols());
  78 }
  79
  80 static ssize_t _show_protocol(struct device *dev,
  81                               struct device_attribute *attr, char *buf)
  82 {
  83         struct mISDNdevice *mdev = dev_to_mISDN(dev);
  84
  85         if (!mdev)
  86                 return -ENODEV;
  87         return sprintf(buf, "%d\n", mdev->D.protocol);
  88 }
  89
  90 static ssize_t _show_name(struct device *dev,
  91                           struct device_attribute *attr, char *buf)
  92 {
  93         strcpy(buf, dev_name(dev));
  94         return strlen(buf);
  95 }
  96
  97 #if 0 /* hangs */
  98 static ssize_t _set_name(struct device *dev, struct device_attribute *attr,
  99                          const char *buf, size_t count)
 100 {
 101         int err = 0;
 102         char *out = kmalloc(count + 1, GFP_KERNEL);
 103
 104         if (!out)
 105                 return -ENOMEM;
 106
 107         memcpy(out, buf, count);
 108         if (count && out[count - 1] == '\n')
 109                 out[--count] = 0;
 110         if (count)
 111                 err = device_rename(dev, out);
 112         kfree(out);
 113
 114         return (err < 0) ? err : count;
 115 }
 116 #endif
 117
 118 static ssize_t _show_channelmap(struct device *dev,
 119                                 struct device_attribute *attr, char *buf)
 120 {
 121         struct mISDNdevice *mdev = dev_to_mISDN(dev);
 122         char *bp = buf;
 123         int i;
 124
 125         for (i = 0; i <= mdev->nrbchan; i++)
 126                 *bp++ = test_channelmap(i, mdev->channelmap) ? '1' : '0';
 127
 128         return bp - buf;
 129 }
 130
 131 static struct device_attribute mISDN_dev_attrs[] = {
 132         __ATTR(id,          S_IRUGO,         _show_id,          NULL),
 133         __ATTR(d_protocols, S_IRUGO,         _show_d_protocols, NULL),
 134         __ATTR(b_protocols, S_IRUGO,         _show_b_protocols, NULL),
 135         __ATTR(protocol,    S_IRUGO,         _show_protocol,    NULL),
 136         __ATTR(channelmap,  S_IRUGO,         _show_channelmap,  NULL),
 137         __ATTR(nrbchan,     S_IRUGO,         _show_nrbchan,     NULL),
 138         __ATTR(name,        S_IRUGO,         _show_name,        NULL),
 139 /*      __ATTR(name,        S_IRUGO | S_IWUSR, _show_name,      _set_name), */
 140         {}
 141 };
 142
 143 #ifdef CONFIG_HOTPLUG
 144 static int mISDN_uevent(struct device *dev, struct kobj_uevent_env *env)
 145 {
 146         struct mISDNdevice *mdev = dev_to_mISDN(dev);
 147
 148         if (!mdev)
 149                 return 0;
 150
 151         if (add_uevent_var(env, "nchans=%d", mdev->nrbchan))
 152                 return -ENOMEM;
 153
 154         return 0;
 155 }
 156 #endif
 157
 158 static void mISDN_class_release(struct class *cls)
 159 {
 160         /* do nothing, it's static */
 161 }
 162
 163 static struct class mISDN_class = {
 164         .name = "mISDN",
 165         .owner = THIS_MODULE,
 166 #ifdef CONFIG_HOTPLUG
 167         .dev_uevent = mISDN_uevent,
 168 #endif
 169         .dev_attrs = mISDN_dev_attrs,
 170         .dev_release = mISDN_dev_release,
 171         .class_release = mISDN_class_release,
 172 };
 173
 174 static int
 175 _get_mdevice(struct device *dev, void *id)
 176 {
 177         struct mISDNdevice *mdev = dev_to_mISDN(dev);
 178
 179         if (!mdev)
 180                 return 0;
 181         if (mdev->id != *(u_int *)id)
 182                 return 0;
 183         return 1;
 184 }
 185
 186 struct mISDNdevice
 187 *get_mdevice(u_int id)
 188 {
 189         return dev_to_mISDN(class_find_device(&mISDN_class, NULL, &id,
 190                                               _get_mdevice));
 191 }
 192
 193 static int
 194 _get_mdevice_count(struct device *dev, void *cnt)
 195 {
 196         *(int *)cnt += 1;
 197         return 0;
 198 }
 199
 200 int
 201 get_mdevice_count(void)
 202 {
 203         int cnt = 0;
 204
 205         class_for_each_device(&mISDN_class, NULL, &cnt, _get_mdevice_count);
 206         return cnt;
 207 }
 208
 209 static int
 210 get_free_devid(void)
 211 {
 212         u_int   i;
 213
 214         for (i = 0; i <= MAX_DEVICE_ID; i++)
 215                 if (!test_and_set_bit(i, (u_long *)&device_ids))
 216                         break;
 217         if (i > MAX_DEVICE_ID)
 218                 return -EBUSY;
 219         return i;
 220 }
 221
 222 int
 223 mISDN_register_device(struct mISDNdevice *dev,
 224                       struct device *parent, char *name)
 225 {
 226         int     err;
 227
 228         err = get_free_devid();
 229         if (err < 0)
 230                 goto error1;
 231         dev->id = err;
 232
 233         device_initialize(&dev->dev);
 234         if (name && name[0])
 235                 dev_set_name(&dev->dev, "%s", name);
 236         else
 237                 dev_set_name(&dev->dev, "mISDN%d", dev->id);
 238         if (debug & DEBUG_CORE)
 239                 printk(KERN_DEBUG "mISDN_register %s %d\n",
 240                        dev_name(&dev->dev), dev->id);
 241         err = create_stack(dev);
 242         if (err)
 243                 goto error1;
 244
 245         dev->dev.class = &mISDN_class;
 246         dev->dev.platform_data = dev;
 247         dev->dev.parent = parent;
 248         dev_set_drvdata(&dev->dev, dev);
 249
 250         err = device_add(&dev->dev);
 251         if (err)
 252                 goto error3;
 253         return 0;
 254
 255 error3:
 256         delete_stack(dev);
 257         return err;
 258 error1:
 259         return err;
 260
 261 }
 262 EXPORT_SYMBOL(mISDN_register_device);
 263
 264 void
 265 mISDN_unregister_device(struct mISDNdevice *dev) {
 266         if (debug & DEBUG_CORE)
 267                 printk(KERN_DEBUG "mISDN_unregister %s %d\n",
 268                        dev_name(&dev->dev), dev->id);
 269         /* sysfs_remove_link(&dev->dev.kobj, "device"); */
 270         device_del(&dev->dev);
 271         dev_set_drvdata(&dev->dev, NULL);
 272
 273         test_and_clear_bit(dev->id, (u_long *)&device_ids);
 274         delete_stack(dev);
 275         put_device(&dev->dev);
 276 }
 277 EXPORT_SYMBOL(mISDN_unregister_device);
 278
 279 u_int
 280 get_all_Bprotocols(void)
 281 {
 282         struct Bprotocol        *bp;
 283         u_int   m = 0;
 284
 285         read_lock(&bp_lock);
 286         list_for_each_entry(bp, &Bprotocols, list)
 287                 m |= bp->Bprotocols;
 288         read_unlock(&bp_lock);
 289         return m;
 290 }
 291
 292 struct Bprotocol *
 293 get_Bprotocol4mask(u_int m)
 294 {
 295         struct Bprotocol        *bp;
 296
 297         read_lock(&bp_lock);
 298         list_for_each_entry(bp, &Bprotocols, list)
 299                 if (bp->Bprotocols & m) {
 300                         read_unlock(&bp_lock);
 301                         return bp;
 302                 }
 303         read_unlock(&bp_lock);
 304         return NULL;
 305 }
 306
 307 struct Bprotocol *
 308 get_Bprotocol4id(u_int id)
 309 {
 310         u_int   m;
 311
 312         if (id < ISDN_P_B_START || id > 63) {
 313                 printk(KERN_WARNING "%s id not in range  %d\n",
 314                        __func__, id);
 315                 return NULL;
 316         }
 317         m = 1 << (id & ISDN_P_B_MASK);
 318         return get_Bprotocol4mask(m);
 319 }
 320
 321 int
 322 mISDN_register_Bprotocol(struct Bprotocol *bp)
 323 {
 324         u_long                  flags;
 325         struct Bprotocol        *old;
 326
 327         if (debug & DEBUG_CORE)
 328                 printk(KERN_DEBUG "%s: %s/%x\n", __func__,
 329                        bp->name, bp->Bprotocols);
 330         old = get_Bprotocol4mask(bp->Bprotocols);
 331         if (old) {
 332                 printk(KERN_WARNING
 333                        "register duplicate protocol old %s/%x new %s/%x\n",
 334                        old->name, old->Bprotocols, bp->name, bp->Bprotocols);
 335                 return -EBUSY;
 336         }
 337         write_lock_irqsave(&bp_lock, flags);
 338         list_add_tail(&bp->list, &Bprotocols);
 339         write_unlock_irqrestore(&bp_lock, flags);
 340         return 0;
 341 }
 342 EXPORT_SYMBOL(mISDN_register_Bprotocol);
 343
 344 void
 345 mISDN_unregister_Bprotocol(struct Bprotocol *bp)
 346 {
 347         u_long  flags;
 348
 349         if (debug & DEBUG_CORE)
 350                 printk(KERN_DEBUG "%s: %s/%x\n", __func__, bp->name,
 351                        bp->Bprotocols);
 352         write_lock_irqsave(&bp_lock, flags);
 353         list_del(&bp->list);
 354         write_unlock_irqrestore(&bp_lock, flags);
 355 }
 356 EXPORT_SYMBOL(mISDN_unregister_Bprotocol);
 357
 358 static int
 359 mISDNInit(void)
 360 {
 361         int     err;
 362
 363         printk(KERN_INFO "Modular ISDN core version %d.%d.%d\n",
 364                MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
 365         mISDN_init_clock(&debug);
 366         mISDN_initstack(&debug);
 367         err = class_register(&mISDN_class);
 368         if (err)
 369                 goto error1;
 370         err = mISDN_inittimer(&debug);
 371         if (err)
 372                 goto error2;
 373         err = l1_init(&debug);
 374         if (err)
 375                 goto error3;
 376         err = Isdnl2_Init(&debug);
 377         if (err)
 378                 goto error4;
 379         err = misdn_sock_init(&debug);
 380         if (err)
 381                 goto error5;
 382         return 0;
 383
 384 error5:
 385         Isdnl2_cleanup();
 386 error4:
 387         l1_cleanup();
 388 error3:
 389         mISDN_timer_cleanup();
 390 error2:
 391         class_unregister(&mISDN_class);
 392 error1:
 393         return err;
 394 }
 395
 396 static void mISDN_cleanup(void)
 397 {
 398         misdn_sock_cleanup();
 399         Isdnl2_cleanup();
 400         l1_cleanup();
 401         mISDN_timer_cleanup();
 402         class_unregister(&mISDN_class);
 403
 404         printk(KERN_DEBUG "mISDNcore unloaded\n");
 405 }
 406
 407 module_init(mISDNInit);
 408 module_exit(mISDN_cleanup);