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net/irda/irda_device.c
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/********************************************************************* * * 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 * ********************************************************************/ |
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#include <linux/string.h> #include <linux/proc_fs.h> #include <linux/skbuff.h> |
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#include <linux/capability.h> |
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#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 <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; |
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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! "); return -ENOMEM; } spin_lock_init(&dongles->hb_spinlock); tasks = hashbin_new(HB_LOCK); if (tasks == NULL) { IRDA_WARNING("IrDA: Can't allocate tasks hashbin! "); 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; } |
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static void leftover_dongle(void *arg) |
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{ struct dongle_reg *reg = arg; IRDA_WARNING("IrDA: Dongle type %x not unregistered ", reg->type); } |
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void irda_device_cleanup(void) |
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{ |
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IRDA_DEBUG(4, "%s() ", __func__); |
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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; |
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IRDA_DEBUG(4, "%s(%s) ", __func__, status ? "TRUE" : "FALSE"); |
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self = (struct irlap_cb *) dev->atalk_ptr; |
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/* 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; |
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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! "); } 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; |
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IRDA_DEBUG(2, "%s() ", __func__); |
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if (!dev->netdev_ops->ndo_do_ioctl) { |
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IRDA_ERROR("%s: do_ioctl not impl. by device driver ", |
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__func__); |
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return -1; } |
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ret = (dev->netdev_ops->ndo_do_ioctl)(dev, (struct ifreq *) &req, SIOCGRECEIVING); |
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if (ret < 0) return ret; return req.ifr_receiving; } |
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static void __irda_task_delete(struct irda_task *task) { del_timer(&task->timer); kfree(task); } |
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static void irda_task_delete(struct irda_task *task) |
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{ /* Unregister task */ hashbin_remove(tasks, (long) task, NULL); __irda_task_delete(task); } |
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/* * 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; |
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IRDA_DEBUG(2, "%s() ", __func__); |
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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! ", |
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__func__); |
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irda_task_delete(task); return TRUE; } } while ((timeout == 0) && (task->state != IRDA_TASK_DONE)); if (timeout < 0) { |
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IRDA_ERROR("%s: Error executing task! ", __func__); |
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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! ", |
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__func__); |
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finished = FALSE; } return finished; } /* |
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* 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; |
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IRDA_DEBUG(2, "%s() ", __func__); |
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task = (struct irda_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) { |
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dev->hard_header_len = 0; dev->addr_len = LAP_ALEN; |
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dev->type = ARPHRD_IRDA; dev->tx_queue_len = 8; /* Window size + 1 s-frame */ |
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memset(dev->broadcast, 0xff, LAP_ALEN); |
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dev->mtu = 2048; dev->flags = IFF_NOARP; } /* |
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* Funciton alloc_irdadev |
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* 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); |
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#ifdef CONFIG_ISA_DMA_API |
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/* * Function setup_dma (idev, buffer, count, mode) * |
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* Setup the DMA channel. Commonly used by LPC FIR drivers |
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* */ 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); |
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#endif |