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
  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
  55static void __irda_task_delete(struct irda_task *task);
  56
  57static hashbin_t *dongles = NULL;
  58static hashbin_t *tasks = NULL;
  59
  60static void irda_task_timer_expired(void *data);
  61
  62int __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
  84static 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
  91void 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 */
 106void 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}
 136EXPORT_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 */
 145int 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
 165static void __irda_task_delete(struct irda_task *task)
 166{
 167        del_timer(&task->timer);
 168
 169        kfree(task);
 170}
 171
 172static 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 */
 188static 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 */
 257static 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 */
 274static 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 */
 293struct net_device *alloc_irdadev(int sizeof_priv)
 294{
 295        return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
 296}
 297EXPORT_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 */
 306void 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}
 321EXPORT_SYMBOL(irda_setup_dma);
 322#endif
 323