linux/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
*
********************************************************************/
#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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
#include <linux/slab.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;
}
[IrDA]: Fix IrDA build failure When having built-in IrDA, we hit the following error: `irda_sysctl_unregister' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irda_proc_unregister' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irsock_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irttp_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `iriap_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irda_device_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irlap_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irlmp_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o make[1]: *** [.tmp_vmlinux1] Error 1 make: *** [_all] Error 2 This is due to the irda_init fix recently added, where we call __exit routines from an __init one. It is a build failure that I didn't catch because it doesn't show up when building IrDA as a module. My apologies for that. The following patch fixes that failure and is against your net-2.6 tree. I hope it can make it to the merge window, and stable@kernel.org is CCed on this mail. Signed-off-by: Samuel Ortiz <samuel@sortiz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-18 09:16:30 +00:00
static void leftover_dongle(void *arg)
{
struct dongle_reg *reg = arg;
IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
reg->type);
}
[IrDA]: Fix IrDA build failure When having built-in IrDA, we hit the following error: `irda_sysctl_unregister' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irda_proc_unregister' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irsock_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irttp_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `iriap_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irda_device_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irlap_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o `irlmp_cleanup' referenced in section `.init.text' of net/built-in.o: defined in discarded section `.exit.text' of net/built-in.o make[1]: *** [.tmp_vmlinux1] Error 1 make: *** [_all] Error 2 This is due to the irda_init fix recently added, where we call __exit routines from an __init one. It is a build failure that I didn't catch because it doesn't show up when building IrDA as a module. My apologies for that. The following patch fixes that failure and is against your net-2.6 tree. I hope it can make it to the merge window, and stable@kernel.org is CCed on this mail. Signed-off-by: Samuel Ortiz <samuel@sortiz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-18 09:16:30 +00:00
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 = (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)
{
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