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, write to the Free Software
  27  *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  28  *     MA 02111-1307 USA
  29  *
  30  ********************************************************************/
  31
  32 #include <linux/string.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/capability.h>
  36 #include <linux/if.h>
  37 #include <linux/if_ether.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/init.h>
  41 #include <linux/tty.h>
  42 #include <linux/kmod.h>
  43 #include <linux/spinlock.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->do_ioctl) {
 153                 IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
 154                            __func__);
 155                 return -1;
 156         }
 157
 158         ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING);
 159         if (ret < 0)
 160                 return ret;
 161
 162         return req.ifr_receiving;
 163 }
 164
 165 static void __irda_task_delete(struct irda_task *task)
 166 {
 167         del_timer(&task->timer);
 168
 169         kfree(task);
 170 }
 171
 172 static void irda_task_delete(struct irda_task *task)
 173 {
 174         /* Unregister task */
 175         hashbin_remove(tasks, (long) task, NULL);
 176
 177         __irda_task_delete(task);
 178 }
 179
 180 /*
 181  * Function irda_task_kick (task)
 182  *
 183  *    Tries to execute a task possible multiple times until the task is either
 184  *    finished, or askes for a timeout. When a task is finished, we do post
 185  *    processing, and notify the parent task, that is waiting for this task
 186  *    to complete.
 187  */
 188 static int irda_task_kick(struct irda_task *task)
 189 {
 190         int finished = TRUE;
 191         int count = 0;
 192         int timeout;
 193
 194         IRDA_DEBUG(2, "%s()\n", __func__);
 195
 196         IRDA_ASSERT(task != NULL, return -1;);
 197         IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
 198
 199         /* Execute task until it's finished, or askes for a timeout */
 200         do {
 201                 timeout = task->function(task);
 202                 if (count++ > 100) {
 203                         IRDA_ERROR("%s: error in task handler!\n",
 204                                    __func__);
 205                         irda_task_delete(task);
 206                         return TRUE;
 207                 }
 208         } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
 209
 210         if (timeout < 0) {
 211                 IRDA_ERROR("%s: Error executing task!\n", __func__);
 212                 irda_task_delete(task);
 213                 return TRUE;
 214         }
 215
 216         /* Check if we are finished */
 217         if (task->state == IRDA_TASK_DONE) {
 218                 del_timer(&task->timer);
 219
 220                 /* Do post processing */
 221                 if (task->finished)
 222                         task->finished(task);
 223
 224                 /* Notify parent */
 225                 if (task->parent) {
 226                         /* Check if parent is waiting for us to complete */
 227                         if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
 228                                 task->parent->state = IRDA_TASK_CHILD_DONE;
 229
 230                                 /* Stop timer now that we are here */
 231                                 del_timer(&task->parent->timer);
 232
 233                                 /* Kick parent task */
 234                                 irda_task_kick(task->parent);
 235                         }
 236                 }
 237                 irda_task_delete(task);
 238         } else if (timeout > 0) {
 239                 irda_start_timer(&task->timer, timeout, (void *) task,
 240                                  irda_task_timer_expired);
 241                 finished = FALSE;
 242         } else {
 243                 IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n",
 244                            __func__);
 245                 finished = FALSE;
 246         }
 247
 248         return finished;
 249 }
 250
 251 /*
 252  * Function irda_task_timer_expired (data)
 253  *
 254  *    Task time has expired. We now try to execute task (again), and restart
 255  *    the timer if the task has not finished yet
 256  */
 257 static void irda_task_timer_expired(void *data)
 258 {
 259         struct irda_task *task;
 260
 261         IRDA_DEBUG(2, "%s()\n", __func__);
 262
 263         task = (struct irda_task *) data;
 264
 265         irda_task_kick(task);
 266 }
 267
 268 /*
 269  * Function irda_device_setup (dev)
 270  *
 271  *    This function should be used by low level device drivers in a similar way
 272  *    as ether_setup() is used by normal network device drivers
 273  */
 274 static void irda_device_setup(struct net_device *dev)
 275 {
 276         dev->hard_header_len = 0;
 277         dev->addr_len        = LAP_ALEN;
 278
 279         dev->type            = ARPHRD_IRDA;
 280         dev->tx_queue_len    = 8; /* Window size + 1 s-frame */
 281
 282         memset(dev->broadcast, 0xff, LAP_ALEN);
 283
 284         dev->mtu = 2048;
 285         dev->flags = IFF_NOARP;
 286 }
 287
 288 /*
 289  * Funciton  alloc_irdadev
 290  *      Allocates and sets up an IRDA device in a manner similar to
 291  *      alloc_etherdev.
 292  */
 293 struct net_device *alloc_irdadev(int sizeof_priv)
 294 {
 295         return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
 296 }
 297 EXPORT_SYMBOL(alloc_irdadev);
 298
 299 #ifdef CONFIG_ISA_DMA_API
 300 /*
 301  * Function setup_dma (idev, buffer, count, mode)
 302  *
 303  *    Setup the DMA channel. Commonly used by LPC FIR drivers
 304  *
 305  */
 306 void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
 307 {
 308         unsigned long flags;
 309
 310         flags = claim_dma_lock();
 311
 312         disable_dma(channel);
 313         clear_dma_ff(channel);
 314         set_dma_mode(channel, mode);
 315         set_dma_addr(channel, buffer);
 316         set_dma_count(channel, count);
 317         enable_dma(channel);
 318
 319         release_dma_lock(flags);
 320 }
 321 EXPORT_SYMBOL(irda_setup_dma);
 322 #endif