net/irda/irda_device.c

   1 /*********************************************************************
   2  *
   3  * Filename:      irda_device.c
   4  * Version:       0.9
   5  * Description:   Utility functions used by the device drivers
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sat Oct  9 09:22:27 1999
   9  * Modified at:   Sun Jan 23 17:41:24 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
  13  *     Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
  14  *
  15  *     This program is free software; you can redistribute it and/or
  16  *     modify it under the terms of the GNU General Public License as
  17  *     published by the Free Software Foundation; either version 2 of
  18  *     the License, or (at your option) any later version.
  19  *
  20  *     This program is distributed in the hope that it will be useful,
  21  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23  *     GNU General Public License for more details.
  24  *
  25  *     You should have received a copy of the GNU General Public License
  26  *     along with this program; if not, see <http://www.gnu.org/licenses/>.
  27  *
  28  ********************************************************************/
  29
  30 #include <linux/string.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/capability.h>
  34 #include <linux/if.h>
  35 #include <linux/if_ether.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/init.h>
  39 #include <linux/tty.h>
  40 #include <linux/kmod.h>
  41 #include <linux/spinlock.h>
  42 #include <linux/slab.h>
  43 #include <linux/export.h>
  44
  45 #include <asm/ioctls.h>
  46 #include <asm/uaccess.h>
  47 #include <asm/dma.h>
  48 #include <asm/io.h>
  49
  50 #include <net/irda/irda_device.h>
  51 #include <net/irda/irlap.h>
  52 #include <net/irda/timer.h>
  53 #include <net/irda/wrapper.h>
  54
  55 static void __irda_task_delete(struct irda_task *task);
  56
  57 static hashbin_t *dongles = NULL;
  58 static hashbin_t *tasks = NULL;
  59
  60 static void irda_task_timer_expired(void *data);
  61
  62 int __init irda_device_init( void)
  63 {
  64         dongles = hashbin_new(HB_NOLOCK);
  65         if (dongles == NULL) {
  66                 IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n");
  67                 return -ENOMEM;
  68         }
  69         spin_lock_init(&dongles->hb_spinlock);
  70
  71         tasks = hashbin_new(HB_LOCK);
  72         if (tasks == NULL) {
  73                 IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n");
  74                 hashbin_delete(dongles, NULL);
  75                 return -ENOMEM;
  76         }
  77
  78         /* We no longer initialise the driver ourselves here, we let
  79          * the system do it for us... - Jean II */
  80
  81         return 0;
  82 }
  83
  84 static void leftover_dongle(void *arg)
  85 {
  86         struct dongle_reg *reg = arg;
  87         IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
  88                      reg->type);
  89 }
  90
  91 void irda_device_cleanup(void)
  92 {
  93         IRDA_DEBUG(4, "%s()\n", __func__);
  94
  95         hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete);
  96
  97         hashbin_delete(dongles, leftover_dongle);
  98 }
  99
 100 /*
 101  * Function irda_device_set_media_busy (self, status)
 102  *
 103  *    Called when we have detected that another station is transmitting
 104  *    in contention mode.
 105  */
 106 void irda_device_set_media_busy(struct net_device *dev, int status)
 107 {
 108         struct irlap_cb *self;
 109
 110         IRDA_DEBUG(4, "%s(%s)\n", __func__, status ? "TRUE" : "FALSE");
 111
 112         self = (struct irlap_cb *) dev->atalk_ptr;
 113
 114         /* Some drivers may enable the receive interrupt before calling
 115          * irlap_open(), or they may disable the receive interrupt
 116          * after calling irlap_close().
 117          * The IrDA stack is protected from this in irlap_driver_rcv().
 118          * However, the driver calls directly the wrapper, that calls
 119          * us directly. Make sure we protect ourselves.
 120          * Jean II */
 121         if (!self || self->magic != LAP_MAGIC)
 122                 return;
 123
 124         if (status) {
 125                 self->media_busy = TRUE;
 126                 if (status == SMALL)
 127                         irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT);
 128                 else
 129                         irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT);
 130                 IRDA_DEBUG( 4, "Media busy!\n");
 131         } else {
 132                 self->media_busy = FALSE;
 133                 irlap_stop_mbusy_timer(self);
 134         }
 135 }
 136 EXPORT_SYMBOL(irda_device_set_media_busy);
 137
 138
 139 /*
 140  * Function irda_device_is_receiving (dev)
 141  *
 142  *    Check if the device driver is currently receiving data
 143  *
 144  */
 145 int irda_device_is_receiving(struct net_device *dev)
 146 {
 147         struct if_irda_req req;
 148         int ret;
 149
 150         IRDA_DEBUG(2, "%s()\n", __func__);
 151
 152         if (!dev->netdev_ops->ndo_do_ioctl) {
 153                 IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
 154                            __func__);
 155                 return -1;
 156         }
 157
 158         ret = (dev->netdev_ops->ndo_do_ioctl)(dev, (struct ifreq *) &req,
 159                                               SIOCGRECEIVING);
 160         if (ret < 0)
 161                 return ret;
 162
 163         return req.ifr_receiving;
 164 }
 165
 166 static void __irda_task_delete(struct irda_task *task)
 167 {
 168         del_timer(&task->timer);
 169
 170         kfree(task);
 171 }
 172
 173 static void irda_task_delete(struct irda_task *task)
 174 {
 175         /* Unregister task */
 176         hashbin_remove(tasks, (long) task, NULL);
 177
 178         __irda_task_delete(task);
 179 }
 180
 181 /*
 182  * Function irda_task_kick (task)
 183  *
 184  *    Tries to execute a task possible multiple times until the task is either
 185  *    finished, or askes for a timeout. When a task is finished, we do post
 186  *    processing, and notify the parent task, that is waiting for this task
 187  *    to complete.
 188  */
 189 static int irda_task_kick(struct irda_task *task)
 190 {
 191         int finished = TRUE;
 192         int count = 0;
 193         int timeout;
 194
 195         IRDA_DEBUG(2, "%s()\n", __func__);
 196
 197         IRDA_ASSERT(task != NULL, return -1;);
 198         IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
 199
 200         /* Execute task until it's finished, or askes for a timeout */
 201         do {
 202                 timeout = task->function(task);
 203                 if (count++ > 100) {
 204                         IRDA_ERROR("%s: error in task handler!\n",
 205                                    __func__);
 206                         irda_task_delete(task);
 207                         return TRUE;
 208                 }
 209         } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
 210
 211         if (timeout < 0) {
 212                 IRDA_ERROR("%s: Error executing task!\n", __func__);
 213                 irda_task_delete(task);
 214                 return TRUE;
 215         }
 216
 217         /* Check if we are finished */
 218         if (task->state == IRDA_TASK_DONE) {
 219                 del_timer(&task->timer);
 220
 221                 /* Do post processing */
 222                 if (task->finished)
 223                         task->finished(task);
 224
 225                 /* Notify parent */
 226                 if (task->parent) {
 227                         /* Check if parent is waiting for us to complete */
 228                         if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
 229                                 task->parent->state = IRDA_TASK_CHILD_DONE;
 230
 231                                 /* Stop timer now that we are here */
 232                                 del_timer(&task->parent->timer);
 233
 234                                 /* Kick parent task */
 235                                 irda_task_kick(task->parent);
 236                         }
 237                 }
 238                 irda_task_delete(task);
 239         } else if (timeout > 0) {
 240                 irda_start_timer(&task->timer, timeout, (void *) task,
 241                                  irda_task_timer_expired);
 242                 finished = FALSE;
 243         } else {
 244                 IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n",
 245                            __func__);
 246                 finished = FALSE;
 247         }
 248
 249         return finished;
 250 }
 251
 252 /*
 253  * Function irda_task_timer_expired (data)
 254  *
 255  *    Task time has expired. We now try to execute task (again), and restart
 256  *    the timer if the task has not finished yet
 257  */
 258 static void irda_task_timer_expired(void *data)
 259 {
 260         struct irda_task *task;
 261
 262         IRDA_DEBUG(2, "%s()\n", __func__);
 263
 264         task = data;
 265
 266         irda_task_kick(task);
 267 }
 268
 269 /*
 270  * Function irda_device_setup (dev)
 271  *
 272  *    This function should be used by low level device drivers in a similar way
 273  *    as ether_setup() is used by normal network device drivers
 274  */
 275 static void irda_device_setup(struct net_device *dev)
 276 {
 277         dev->hard_header_len = 0;
 278         dev->addr_len        = LAP_ALEN;
 279
 280         dev->type            = ARPHRD_IRDA;
 281         dev->tx_queue_len    = 8; /* Window size + 1 s-frame */
 282
 283         memset(dev->broadcast, 0xff, LAP_ALEN);
 284
 285         dev->mtu = 2048;
 286         dev->flags = IFF_NOARP;
 287 }
 288
 289 /*
 290  * Funciton  alloc_irdadev
 291  *      Allocates and sets up an IRDA device in a manner similar to
 292  *      alloc_etherdev.
 293  */
 294 struct net_device *alloc_irdadev(int sizeof_priv)
 295 {
 296         return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
 297 }
 298 EXPORT_SYMBOL(alloc_irdadev);
 299
 300 #ifdef CONFIG_ISA_DMA_API
 301 /*
 302  * Function setup_dma (idev, buffer, count, mode)
 303  *
 304  *    Setup the DMA channel. Commonly used by LPC FIR drivers
 305  *
 306  */
 307 void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
 308 {
 309         unsigned long flags;
 310
 311         flags = claim_dma_lock();
 312
 313         disable_dma(channel);
 314         clear_dma_ff(channel);
 315         set_dma_mode(channel, mode);
 316         set_dma_addr(channel, buffer);
 317         set_dma_count(channel, count);
 318         enable_dma(channel);
 319
 320         release_dma_lock(flags);
 321 }
 322 EXPORT_SYMBOL(irda_setup_dma);
 323 #endif