+++ /dev/null
-/*********************************************************************
- *
- * 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 <linux/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) {
- net_warn_ratelimited("IrDA: Can't allocate dongles hashbin!\n");
- return -ENOMEM;
- }
- spin_lock_init(&dongles->hb_spinlock);
-
- tasks = hashbin_new(HB_LOCK);
- if (tasks == NULL) {
- net_warn_ratelimited("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;
- net_warn_ratelimited("IrDA: Dongle type %x not unregistered\n",
- reg->type);
-}
-
-void irda_device_cleanup(void)
-{
- 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;
-
- pr_debug("%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);
- pr_debug("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;
-
- if (!dev->netdev_ops->ndo_do_ioctl) {
- net_err_ratelimited("%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_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) {
- net_err_ratelimited("%s: error in task handler!\n",
- __func__);
- irda_task_delete(task);
- return TRUE;
- }
- } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
-
- if (timeout < 0) {
- net_err_ratelimited("%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 {
- pr_debug("%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;
-
- 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", NET_NAME_UNKNOWN,
- 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
projects / linux-2.6-block.git / blobdiff