linux/net/irda/irda_device.c
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   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#include <linux/slab.h>
  45
  46#include <asm/ioctls.h>
  47#include <asm/uaccess.h>
  48#include <asm/dma.h>
  49#include <asm/io.h>
  50
  51#include <net/irda/irda_device.h>
  52#include <net/irda/irlap.h>
  53#include <net/irda/timer.h>
  54#include <net/irda/wrapper.h>
  55
  56static void __irda_task_delete(struct irda_task *task);
  57
  58static hashbin_t *dongles = NULL;
  59static hashbin_t *tasks = NULL;
  60
  61static void irda_task_timer_expired(void *data);
  62
  63int __init irda_device_init( void)
  64{
  65        dongles = hashbin_new(HB_NOLOCK);
  66        if (dongles == NULL) {
  67                IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n");
  68                return -ENOMEM;
  69        }
  70        spin_lock_init(&dongles->hb_spinlock);
  71
  72        tasks = hashbin_new(HB_LOCK);
  73        if (tasks == NULL) {
  74                IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n");
  75                hashbin_delete(dongles, NULL);
  76                return -ENOMEM;
  77        }
  78
  79        /* We no longer initialise the driver ourselves here, we let
  80         * the system do it for us... - Jean II */
  81
  82        return 0;
  83}
  84
  85static void leftover_dongle(void *arg)
  86{
  87        struct dongle_reg *reg = arg;
  88        IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
  89                     reg->type);
  90}
  91
  92void irda_device_cleanup(void)
  93{
  94        IRDA_DEBUG(4, "%s()\n", __func__);
  95
  96        hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete);
  97
  98        hashbin_delete(dongles, leftover_dongle);
  99}
 100
 101/*
 102 * Function irda_device_set_media_busy (self, status)
 103 *
 104 *    Called when we have detected that another station is transmitting
 105 *    in contention mode.
 106 */
 107void irda_device_set_media_busy(struct net_device *dev, int status)
 108{
 109        struct irlap_cb *self;
 110
 111        IRDA_DEBUG(4, "%s(%s)\n", __func__, status ? "TRUE" : "FALSE");
 112
 113        self = (struct irlap_cb *) dev->atalk_ptr;
 114
 115        /* Some drivers may enable the receive interrupt before calling
 116         * irlap_open(), or they may disable the receive interrupt
 117         * after calling irlap_close().
 118         * The IrDA stack is protected from this in irlap_driver_rcv().
 119         * However, the driver calls directly the wrapper, that calls
 120         * us directly. Make sure we protect ourselves.
 121         * Jean II */
 122        if (!self || self->magic != LAP_MAGIC)
 123                return;
 124
 125        if (status) {
 126                self->media_busy = TRUE;
 127                if (status == SMALL)
 128                        irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT);
 129                else
 130                        irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT);
 131                IRDA_DEBUG( 4, "Media busy!\n");
 132        } else {
 133                self->media_busy = FALSE;
 134                irlap_stop_mbusy_timer(self);
 135        }
 136}
 137EXPORT_SYMBOL(irda_device_set_media_busy);
 138
 139
 140/*
 141 * Function irda_device_is_receiving (dev)
 142 *
 143 *    Check if the device driver is currently receiving data
 144 *
 145 */
 146int irda_device_is_receiving(struct net_device *dev)
 147{
 148        struct if_irda_req req;
 149        int ret;
 150
 151        IRDA_DEBUG(2, "%s()\n", __func__);
 152
 153        if (!dev->netdev_ops->ndo_do_ioctl) {
 154                IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
 155                           __func__);
 156                return -1;
 157        }
 158
 159        ret = (dev->netdev_ops->ndo_do_ioctl)(dev, (struct ifreq *) &req,
 160                                              SIOCGRECEIVING);
 161        if (ret < 0)
 162                return ret;
 163
 164        return req.ifr_receiving;
 165}
 166
 167static void __irda_task_delete(struct irda_task *task)
 168{
 169        del_timer(&task->timer);
 170
 171        kfree(task);
 172}
 173
 174static void irda_task_delete(struct irda_task *task)
 175{
 176        /* Unregister task */
 177        hashbin_remove(tasks, (long) task, NULL);
 178
 179        __irda_task_delete(task);
 180}
 181
 182/*
 183 * Function irda_task_kick (task)
 184 *
 185 *    Tries to execute a task possible multiple times until the task is either
 186 *    finished, or askes for a timeout. When a task is finished, we do post
 187 *    processing, and notify the parent task, that is waiting for this task
 188 *    to complete.
 189 */
 190static int irda_task_kick(struct irda_task *task)
 191{
 192        int finished = TRUE;
 193        int count = 0;
 194        int timeout;
 195
 196        IRDA_DEBUG(2, "%s()\n", __func__);
 197
 198        IRDA_ASSERT(task != NULL, return -1;);
 199        IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
 200
 201        /* Execute task until it's finished, or askes for a timeout */
 202        do {
 203                timeout = task->function(task);
 204                if (count++ > 100) {
 205                        IRDA_ERROR("%s: error in task handler!\n",
 206                                   __func__);
 207                        irda_task_delete(task);
 208                        return TRUE;
 209                }
 210        } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
 211
 212        if (timeout < 0) {
 213                IRDA_ERROR("%s: Error executing task!\n", __func__);
 214                irda_task_delete(task);
 215                return TRUE;
 216        }
 217
 218        /* Check if we are finished */
 219        if (task->state == IRDA_TASK_DONE) {
 220                del_timer(&task->timer);
 221
 222                /* Do post processing */
 223                if (task->finished)
 224                        task->finished(task);
 225
 226                /* Notify parent */
 227                if (task->parent) {
 228                        /* Check if parent is waiting for us to complete */
 229                        if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
 230                                task->parent->state = IRDA_TASK_CHILD_DONE;
 231
 232                                /* Stop timer now that we are here */
 233                                del_timer(&task->parent->timer);
 234
 235                                /* Kick parent task */
 236                                irda_task_kick(task->parent);
 237                        }
 238                }
 239                irda_task_delete(task);
 240        } else if (timeout > 0) {
 241                irda_start_timer(&task->timer, timeout, (void *) task,
 242                                 irda_task_timer_expired);
 243                finished = FALSE;
 244        } else {
 245                IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n",
 246                           __func__);
 247                finished = FALSE;
 248        }
 249
 250        return finished;
 251}
 252
 253/*
 254 * Function irda_task_timer_expired (data)
 255 *
 256 *    Task time has expired. We now try to execute task (again), and restart
 257 *    the timer if the task has not finished yet
 258 */
 259static void irda_task_timer_expired(void *data)
 260{
 261        struct irda_task *task;
 262
 263        IRDA_DEBUG(2, "%s()\n", __func__);
 264
 265        task = (struct irda_task *) data;
 266
 267        irda_task_kick(task);
 268}
 269
 270/*
 271 * Function irda_device_setup (dev)
 272 *
 273 *    This function should be used by low level device drivers in a similar way
 274 *    as ether_setup() is used by normal network device drivers
 275 */
 276static void irda_device_setup(struct net_device *dev)
 277{
 278        dev->hard_header_len = 0;
 279        dev->addr_len        = LAP_ALEN;
 280
 281        dev->type            = ARPHRD_IRDA;
 282        dev->tx_queue_len    = 8; /* Window size + 1 s-frame */
 283
 284        memset(dev->broadcast, 0xff, LAP_ALEN);
 285
 286        dev->mtu = 2048;
 287        dev->flags = IFF_NOARP;
 288}
 289
 290/*
 291 * Funciton  alloc_irdadev
 292 *      Allocates and sets up an IRDA device in a manner similar to
 293 *      alloc_etherdev.
 294 */
 295struct net_device *alloc_irdadev(int sizeof_priv)
 296{
 297        return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
 298}
 299EXPORT_SYMBOL(alloc_irdadev);
 300
 301#ifdef CONFIG_ISA_DMA_API
 302/*
 303 * Function setup_dma (idev, buffer, count, mode)
 304 *
 305 *    Setup the DMA channel. Commonly used by LPC FIR drivers
 306 *
 307 */
 308void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
 309{
 310        unsigned long flags;
 311
 312        flags = claim_dma_lock();
 313
 314        disable_dma(channel);
 315        clear_dma_ff(channel);
 316        set_dma_mode(channel, mode);
 317        set_dma_addr(channel, buffer);
 318        set_dma_count(channel, count);
 319        enable_dma(channel);
 320
 321        release_dma_lock(flags);
 322}
 323EXPORT_SYMBOL(irda_setup_dma);
 324#endif
 325