linux/net/irda/irda_device.c
Jeff Kirsher d37705092f net/irda: Fix FSF address in file headers
Several files refer to an old address for the Free Software Foundation
in the file header comment.  Resolve by replacing the address with
the URL <http://www.gnu.org/licenses/> so that we do not have to keep
updating the header comments anytime the address changes.

CC: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-06 12:37:57 -05:00

324 lines
7.9 KiB
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, see <http://www.gnu.org/licenses/>.
*
********************************************************************/
#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