Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
489
net/irda/irda_device.c
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489
net/irda/irda_device.c
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@@ -0,0 +1,489 @@
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/*********************************************************************
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*
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* Filename: irda_device.c
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* Version: 0.9
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* Description: Utility functions used by the device drivers
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Sat Oct 9 09:22:27 1999
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* Modified at: Sun Jan 23 17:41:24 2000
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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*
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* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
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* Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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********************************************************************/
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#include <linux/config.h>
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#include <linux/string.h>
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#include <linux/proc_fs.h>
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#include <linux/skbuff.h>
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#include <linux/if.h>
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#include <linux/if_ether.h>
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#include <linux/if_arp.h>
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#include <linux/netdevice.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/kmod.h>
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#include <linux/spinlock.h>
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#include <asm/ioctls.h>
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#include <asm/uaccess.h>
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#include <asm/dma.h>
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#include <asm/io.h>
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#include <net/irda/irda_device.h>
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#include <net/irda/irlap.h>
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#include <net/irda/timer.h>
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#include <net/irda/wrapper.h>
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static void __irda_task_delete(struct irda_task *task);
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static hashbin_t *dongles = NULL;
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static hashbin_t *tasks = NULL;
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#ifdef CONFIG_IRDA_DEBUG
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static const char *task_state[] = {
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"IRDA_TASK_INIT",
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"IRDA_TASK_DONE",
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"IRDA_TASK_WAIT",
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"IRDA_TASK_WAIT1",
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"IRDA_TASK_WAIT2",
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"IRDA_TASK_WAIT3",
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"IRDA_TASK_CHILD_INIT",
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"IRDA_TASK_CHILD_WAIT",
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"IRDA_TASK_CHILD_DONE",
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};
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#endif /* CONFIG_IRDA_DEBUG */
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static void irda_task_timer_expired(void *data);
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int __init irda_device_init( void)
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{
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dongles = hashbin_new(HB_NOLOCK);
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if (dongles == NULL) {
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IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n");
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return -ENOMEM;
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}
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spin_lock_init(&dongles->hb_spinlock);
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tasks = hashbin_new(HB_LOCK);
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if (tasks == NULL) {
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IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n");
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hashbin_delete(dongles, NULL);
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return -ENOMEM;
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}
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/* We no longer initialise the driver ourselves here, we let
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* the system do it for us... - Jean II */
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return 0;
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}
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static void __exit leftover_dongle(void *arg)
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{
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struct dongle_reg *reg = arg;
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IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
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reg->type);
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}
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void __exit irda_device_cleanup(void)
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{
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IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
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hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete);
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hashbin_delete(dongles, leftover_dongle);
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}
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/*
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* Function irda_device_set_media_busy (self, status)
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*
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* Called when we have detected that another station is transmitting
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* in contention mode.
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*/
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void irda_device_set_media_busy(struct net_device *dev, int status)
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{
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struct irlap_cb *self;
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IRDA_DEBUG(4, "%s(%s)\n", __FUNCTION__, status ? "TRUE" : "FALSE");
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self = (struct irlap_cb *) dev->atalk_ptr;
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IRDA_ASSERT(self != NULL, return;);
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IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
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if (status) {
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self->media_busy = TRUE;
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if (status == SMALL)
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irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT);
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else
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irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT);
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IRDA_DEBUG( 4, "Media busy!\n");
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} else {
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self->media_busy = FALSE;
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irlap_stop_mbusy_timer(self);
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}
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}
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EXPORT_SYMBOL(irda_device_set_media_busy);
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/*
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* Function irda_device_is_receiving (dev)
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*
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* Check if the device driver is currently receiving data
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*
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*/
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int irda_device_is_receiving(struct net_device *dev)
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{
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struct if_irda_req req;
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int ret;
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
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if (!dev->do_ioctl) {
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IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
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__FUNCTION__);
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return -1;
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}
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ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING);
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if (ret < 0)
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return ret;
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return req.ifr_receiving;
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}
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void irda_task_next_state(struct irda_task *task, IRDA_TASK_STATE state)
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{
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IRDA_DEBUG(2, "%s(), state = %s\n", __FUNCTION__, task_state[state]);
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task->state = state;
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}
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EXPORT_SYMBOL(irda_task_next_state);
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static void __irda_task_delete(struct irda_task *task)
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{
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del_timer(&task->timer);
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kfree(task);
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}
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void irda_task_delete(struct irda_task *task)
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{
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/* Unregister task */
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hashbin_remove(tasks, (long) task, NULL);
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__irda_task_delete(task);
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}
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EXPORT_SYMBOL(irda_task_delete);
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/*
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* Function irda_task_kick (task)
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*
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* Tries to execute a task possible multiple times until the task is either
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* finished, or askes for a timeout. When a task is finished, we do post
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* processing, and notify the parent task, that is waiting for this task
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* to complete.
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*/
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static int irda_task_kick(struct irda_task *task)
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{
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int finished = TRUE;
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int count = 0;
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int timeout;
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
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IRDA_ASSERT(task != NULL, return -1;);
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IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
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/* Execute task until it's finished, or askes for a timeout */
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do {
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timeout = task->function(task);
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if (count++ > 100) {
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IRDA_ERROR("%s: error in task handler!\n",
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__FUNCTION__);
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irda_task_delete(task);
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return TRUE;
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}
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} while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
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if (timeout < 0) {
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IRDA_ERROR("%s: Error executing task!\n", __FUNCTION__);
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irda_task_delete(task);
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return TRUE;
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}
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/* Check if we are finished */
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if (task->state == IRDA_TASK_DONE) {
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del_timer(&task->timer);
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/* Do post processing */
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if (task->finished)
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task->finished(task);
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/* Notify parent */
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if (task->parent) {
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/* Check if parent is waiting for us to complete */
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if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
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task->parent->state = IRDA_TASK_CHILD_DONE;
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/* Stop timer now that we are here */
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del_timer(&task->parent->timer);
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/* Kick parent task */
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irda_task_kick(task->parent);
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}
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}
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irda_task_delete(task);
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} else if (timeout > 0) {
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irda_start_timer(&task->timer, timeout, (void *) task,
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irda_task_timer_expired);
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finished = FALSE;
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} else {
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IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n",
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__FUNCTION__);
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finished = FALSE;
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}
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return finished;
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}
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/*
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* Function irda_task_execute (instance, function, finished)
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*
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* This function registers and tries to execute tasks that may take some
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* time to complete. We do it this hairy way since we may have been
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* called from interrupt context, so it's not possible to use
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* schedule_timeout()
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* Two important notes :
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* o Make sure you irda_task_delete(task); in case you delete the
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* calling instance.
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* o No real need to lock when calling this function, but you may
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* want to lock within the task handler.
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* Jean II
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*/
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struct irda_task *irda_task_execute(void *instance,
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IRDA_TASK_CALLBACK function,
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IRDA_TASK_CALLBACK finished,
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struct irda_task *parent, void *param)
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{
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struct irda_task *task;
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
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task = kmalloc(sizeof(struct irda_task), GFP_ATOMIC);
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if (!task)
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return NULL;
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task->state = IRDA_TASK_INIT;
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task->instance = instance;
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task->function = function;
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task->finished = finished;
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task->parent = parent;
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task->param = param;
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task->magic = IRDA_TASK_MAGIC;
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init_timer(&task->timer);
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/* Register task */
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hashbin_insert(tasks, (irda_queue_t *) task, (long) task, NULL);
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/* No time to waste, so lets get going! */
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return irda_task_kick(task) ? NULL : task;
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}
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EXPORT_SYMBOL(irda_task_execute);
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/*
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* Function irda_task_timer_expired (data)
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*
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* Task time has expired. We now try to execute task (again), and restart
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* the timer if the task has not finished yet
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*/
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static void irda_task_timer_expired(void *data)
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{
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struct irda_task *task;
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IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
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task = (struct irda_task *) data;
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irda_task_kick(task);
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}
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/*
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* Function irda_device_setup (dev)
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*
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* This function should be used by low level device drivers in a similar way
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* as ether_setup() is used by normal network device drivers
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*/
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static void irda_device_setup(struct net_device *dev)
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{
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dev->hard_header_len = 0;
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dev->addr_len = 0;
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dev->type = ARPHRD_IRDA;
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dev->tx_queue_len = 8; /* Window size + 1 s-frame */
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memset(dev->broadcast, 0xff, 4);
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dev->mtu = 2048;
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dev->flags = IFF_NOARP;
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}
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/*
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* Funciton alloc_irdadev
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* Allocates and sets up an IRDA device in a manner similar to
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* alloc_etherdev.
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*/
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struct net_device *alloc_irdadev(int sizeof_priv)
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{
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return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
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}
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EXPORT_SYMBOL(alloc_irdadev);
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/*
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* Function irda_device_init_dongle (self, type, qos)
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*
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* Initialize attached dongle.
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*
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* Important : request_module require us to call this function with
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* a process context and irq enabled. - Jean II
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*/
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dongle_t *irda_device_dongle_init(struct net_device *dev, int type)
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{
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struct dongle_reg *reg;
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dongle_t *dongle = NULL;
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might_sleep();
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spin_lock(&dongles->hb_spinlock);
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reg = hashbin_find(dongles, type, NULL);
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#ifdef CONFIG_KMOD
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/* Try to load the module needed */
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if (!reg && capable(CAP_SYS_MODULE)) {
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spin_unlock(&dongles->hb_spinlock);
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request_module("irda-dongle-%d", type);
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spin_lock(&dongles->hb_spinlock);
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reg = hashbin_find(dongles, type, NULL);
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}
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#endif
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if (!reg || !try_module_get(reg->owner) ) {
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IRDA_ERROR("IrDA: Unable to find requested dongle type %x\n",
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type);
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goto out;
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}
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/* Allocate dongle info for this instance */
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dongle = kmalloc(sizeof(dongle_t), GFP_KERNEL);
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if (!dongle)
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goto out;
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memset(dongle, 0, sizeof(dongle_t));
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/* Bind the registration info to this particular instance */
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dongle->issue = reg;
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dongle->dev = dev;
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out:
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spin_unlock(&dongles->hb_spinlock);
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return dongle;
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}
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EXPORT_SYMBOL(irda_device_dongle_init);
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/*
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* Function irda_device_dongle_cleanup (dongle)
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*/
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int irda_device_dongle_cleanup(dongle_t *dongle)
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{
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IRDA_ASSERT(dongle != NULL, return -1;);
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dongle->issue->close(dongle);
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module_put(dongle->issue->owner);
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kfree(dongle);
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return 0;
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}
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EXPORT_SYMBOL(irda_device_dongle_cleanup);
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/*
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* Function irda_device_register_dongle (dongle)
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*/
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int irda_device_register_dongle(struct dongle_reg *new)
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{
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spin_lock(&dongles->hb_spinlock);
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/* Check if this dongle has been registered before */
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if (hashbin_find(dongles, new->type, NULL)) {
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IRDA_MESSAGE("%s: Dongle type %x already registered\n",
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__FUNCTION__, new->type);
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} else {
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/* Insert IrDA dongle into hashbin */
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hashbin_insert(dongles, (irda_queue_t *) new, new->type, NULL);
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}
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spin_unlock(&dongles->hb_spinlock);
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return 0;
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}
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EXPORT_SYMBOL(irda_device_register_dongle);
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/*
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* Function irda_device_unregister_dongle (dongle)
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*
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* Unregister dongle, and remove dongle from list of registered dongles
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*
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*/
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void irda_device_unregister_dongle(struct dongle_reg *dongle)
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{
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struct dongle *node;
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spin_lock(&dongles->hb_spinlock);
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node = hashbin_remove(dongles, dongle->type, NULL);
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if (!node)
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IRDA_ERROR("%s: dongle not found!\n", __FUNCTION__);
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spin_unlock(&dongles->hb_spinlock);
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}
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EXPORT_SYMBOL(irda_device_unregister_dongle);
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#ifdef CONFIG_ISA
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/*
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* Function setup_dma (idev, buffer, count, mode)
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*
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* Setup the DMA channel. Commonly used by ISA FIR drivers
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*
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*/
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void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
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{
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unsigned long flags;
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flags = claim_dma_lock();
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disable_dma(channel);
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clear_dma_ff(channel);
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set_dma_mode(channel, mode);
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set_dma_addr(channel, buffer);
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set_dma_count(channel, count);
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enable_dma(channel);
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release_dma_lock(flags);
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}
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EXPORT_SYMBOL(irda_setup_dma);
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#endif
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