- 根目录:
- net
- irda
- irda_device.c
/*********************************************************************
*
* Filename: irda_device.c
* Version: 0.9
* Description: Utility functions used by the device drivers
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sat Oct 9 09:22:27 1999
* Modified at: Sun Jan 23 17:41:24 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
* Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
********************************************************************/
#include <linux/string.h>
#include <linux/proc_fs.h>
#include <linux/skbuff.h>
#include <linux/capability.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <linux/kmod.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <asm/ioctls.h>
#include <asm/uaccess.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <net/irda/irda_device.h>
#include <net/irda/irlap.h>
#include <net/irda/timer.h>
#include <net/irda/wrapper.h>
static void __irda_task_delete(struct irda_task *task);
static hashbin_t *dongles = NULL;
static hashbin_t *tasks = NULL;
static void irda_task_timer_expired(void *data);
int __init irda_device_init( void)
{
dongles = hashbin_new(HB_NOLOCK);
if (dongles == NULL) {
IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n");
return -ENOMEM;
}
spin_lock_init(&dongles->hb_spinlock);
tasks = hashbin_new(HB_LOCK);
if (tasks == NULL) {
IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n");
hashbin_delete(dongles, NULL);
return -ENOMEM;
}
/* We no longer initialise the driver ourselves here, we let
* the system do it for us... - Jean II */
return 0;
}
static void leftover_dongle(void *arg)
{
struct dongle_reg *reg = arg;
IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
reg->type);
}
void irda_device_cleanup(void)
{
IRDA_DEBUG(4, "%s()\n", __func__);
hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete);
hashbin_delete(dongles, leftover_dongle);
}
/*
* Function irda_device_set_media_busy (self, status)
*
* Called when we have detected that another station is transmitting
* in contention mode.
*/
void irda_device_set_media_busy(struct net_device *dev, int status)
{
struct irlap_cb *self;
IRDA_DEBUG(4, "%s(%s)\n", __func__, status ? "TRUE" : "FALSE");
self = (struct irlap_cb *) dev->atalk_ptr;
/* Some drivers may enable the receive interrupt before calling
* irlap_open(), or they may disable the receive interrupt
* after calling irlap_close().
* The IrDA stack is protected from this in irlap_driver_rcv().
* However, the driver calls directly the wrapper, that calls
* us directly. Make sure we protect ourselves.
* Jean II */
if (!self || self->magic != LAP_MAGIC)
return;
if (status) {
self->media_busy = TRUE;
if (status == SMALL)
irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT);
else
irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT);
IRDA_DEBUG( 4, "Media busy!\n");
} else {
self->media_busy = FALSE;
irlap_stop_mbusy_timer(self);
}
}
EXPORT_SYMBOL(irda_device_set_media_busy);
/*
* Function irda_device_is_receiving (dev)
*
* Check if the device driver is currently receiving data
*
*/
int irda_device_is_receiving(struct net_device *dev)
{
struct if_irda_req req;
int ret;
IRDA_DEBUG(2, "%s()\n", __func__);
if (!dev->netdev_ops->ndo_do_ioctl) {
IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
__func__);
return -1;
}
ret = (dev->netdev_ops->ndo_do_ioctl)(dev, (struct ifreq *) &req,
SIOCGRECEIVING);
if (ret < 0)
return ret;
return req.ifr_receiving;
}
static void __irda_task_delete(struct irda_task *task)
{
del_timer(&task->timer);
kfree(task);
}
static void irda_task_delete(struct irda_task *task)
{
/* Unregister task */
hashbin_remove(tasks, (long) task, NULL);
__irda_task_delete(task);
}
/*
* Function irda_task_kick (task)
*
* Tries to execute a task possible multiple times until the task is either
* finished, or askes for a timeout. When a task is finished, we do post
* processing, and notify the parent task, that is waiting for this task
* to complete.
*/
static int irda_task_kick(struct irda_task *task)
{
int finished = TRUE;
int count = 0;
int timeout;
IRDA_DEBUG(2, "%s()\n", __func__);
IRDA_ASSERT(task != NULL, return -1;);
IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
/* Execute task until it's finished, or askes for a timeout */
do {
timeout = task->function(task);
if (count++ > 100) {
IRDA_ERROR("%s: error in task handler!\n",
__func__);
irda_task_delete(task);
return TRUE;
}
} while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
if (timeout < 0) {
IRDA_ERROR("%s: Error executing task!\n", __func__);
irda_task_delete(task);
return TRUE;
}
/* Check if we are finished */
if (task->state == IRDA_TASK_DONE) {
del_timer(&task->timer);
/* Do post processing */
if (task->finished)
task->finished(task);
/* Notify parent */
if (task->parent) {
/* Check if parent is waiting for us to complete */
if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
task->parent->state = IRDA_TASK_CHILD_DONE;
/* Stop timer now that we are here */
del_timer(&task->parent->timer);
/* Kick parent task */
irda_task_kick(task->parent);
}
}
irda_task_delete(task);
} else if (timeout > 0) {
irda_start_timer(&task->timer, timeout, (void *) task,
irda_task_timer_expired);
finished = FALSE;
} else {
IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n",
__func__);
finished = FALSE;
}
return finished;
}
/*
* Function irda_task_timer_expired (data)
*
* Task time has expired. We now try to execute task (again), and restart
* the timer if the task has not finished yet
*/
static void irda_task_timer_expired(void *data)
{
struct irda_task *task;
IRDA_DEBUG(2, "%s()\n", __func__);
task = data;
irda_task_kick(task);
}
/*
* Function irda_device_setup (dev)
*
* This function should be used by low level device drivers in a similar way
* as ether_setup() is used by normal network device drivers
*/
static void irda_device_setup(struct net_device *dev)
{
dev->hard_header_len = 0;
dev->addr_len = LAP_ALEN;
dev->type = ARPHRD_IRDA;
dev->tx_queue_len = 8; /* Window size + 1 s-frame */
memset(dev->broadcast, 0xff, LAP_ALEN);
dev->mtu = 2048;
dev->flags = IFF_NOARP;
}
/*
* Funciton alloc_irdadev
* Allocates and sets up an IRDA device in a manner similar to
* alloc_etherdev.
*/
struct net_device *alloc_irdadev(int sizeof_priv)
{
return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
}
EXPORT_SYMBOL(alloc_irdadev);
#ifdef CONFIG_ISA_DMA_API
/*
* Function setup_dma (idev, buffer, count, mode)
*
* Setup the DMA channel. Commonly used by LPC FIR drivers
*
*/
void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
{
unsigned long flags;
flags = claim_dma_lock();
disable_dma(channel);
clear_dma_ff(channel);
set_dma_mode(channel, mode);
set_dma_addr(channel, buffer);
set_dma_count(channel, count);
enable_dma(channel);
release_dma_lock(flags);
}
EXPORT_SYMBOL(irda_setup_dma);
#endif