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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/irda/irda_device.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'net/irda/irda_device.c')
-rw-r--r--net/irda/irda_device.c489
1 files changed, 489 insertions, 0 deletions
diff --git a/net/irda/irda_device.c b/net/irda/irda_device.c
new file mode 100644
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+++ b/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/config.h>
+#include <linux/string.h>
+#include <linux/proc_fs.h>
+#include <linux/skbuff.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 <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;
+
+#ifdef CONFIG_IRDA_DEBUG
+static const char *task_state[] = {
+ "IRDA_TASK_INIT",
+ "IRDA_TASK_DONE",
+ "IRDA_TASK_WAIT",
+ "IRDA_TASK_WAIT1",
+ "IRDA_TASK_WAIT2",
+ "IRDA_TASK_WAIT3",
+ "IRDA_TASK_CHILD_INIT",
+ "IRDA_TASK_CHILD_WAIT",
+ "IRDA_TASK_CHILD_DONE",
+};
+#endif /* CONFIG_IRDA_DEBUG */
+
+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 __exit leftover_dongle(void *arg)
+{
+ struct dongle_reg *reg = arg;
+ IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
+ reg->type);
+}
+
+void __exit irda_device_cleanup(void)
+{
+ IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
+
+ 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", __FUNCTION__, status ? "TRUE" : "FALSE");
+
+ self = (struct irlap_cb *) dev->atalk_ptr;
+
+ IRDA_ASSERT(self != NULL, return;);
+ IRDA_ASSERT(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", __FUNCTION__);
+
+ if (!dev->do_ioctl) {
+ IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
+ __FUNCTION__);
+ return -1;
+ }
+
+ ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING);
+ if (ret < 0)
+ return ret;
+
+ return req.ifr_receiving;
+}
+
+void irda_task_next_state(struct irda_task *task, IRDA_TASK_STATE state)
+{
+ IRDA_DEBUG(2, "%s(), state = %s\n", __FUNCTION__, task_state[state]);
+
+ task->state = state;
+}
+EXPORT_SYMBOL(irda_task_next_state);
+
+static void __irda_task_delete(struct irda_task *task)
+{
+ del_timer(&task->timer);
+
+ kfree(task);
+}
+
+void irda_task_delete(struct irda_task *task)
+{
+ /* Unregister task */
+ hashbin_remove(tasks, (long) task, NULL);
+
+ __irda_task_delete(task);
+}
+EXPORT_SYMBOL(irda_task_delete);
+
+/*
+ * 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", __FUNCTION__);
+
+ 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",
+ __FUNCTION__);
+ irda_task_delete(task);
+ return TRUE;
+ }
+ } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
+
+ if (timeout < 0) {
+ IRDA_ERROR("%s: Error executing task!\n", __FUNCTION__);
+ 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",
+ __FUNCTION__);
+ finished = FALSE;
+ }
+
+ return finished;
+}
+
+/*
+ * Function irda_task_execute (instance, function, finished)
+ *
+ * This function registers and tries to execute tasks that may take some
+ * time to complete. We do it this hairy way since we may have been
+ * called from interrupt context, so it's not possible to use
+ * schedule_timeout()
+ * Two important notes :
+ * o Make sure you irda_task_delete(task); in case you delete the
+ * calling instance.
+ * o No real need to lock when calling this function, but you may
+ * want to lock within the task handler.
+ * Jean II
+ */
+struct irda_task *irda_task_execute(void *instance,
+ IRDA_TASK_CALLBACK function,
+ IRDA_TASK_CALLBACK finished,
+ struct irda_task *parent, void *param)
+{
+ struct irda_task *task;
+
+ IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
+
+ task = kmalloc(sizeof(struct irda_task), GFP_ATOMIC);
+ if (!task)
+ return NULL;
+
+ task->state = IRDA_TASK_INIT;
+ task->instance = instance;
+ task->function = function;
+ task->finished = finished;
+ task->parent = parent;
+ task->param = param;
+ task->magic = IRDA_TASK_MAGIC;
+
+ init_timer(&task->timer);
+
+ /* Register task */
+ hashbin_insert(tasks, (irda_queue_t *) task, (long) task, NULL);
+
+ /* No time to waste, so lets get going! */
+ return irda_task_kick(task) ? NULL : task;
+}
+EXPORT_SYMBOL(irda_task_execute);
+
+/*
+ * 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", __FUNCTION__);
+
+ 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 = 0;
+
+ dev->type = ARPHRD_IRDA;
+ dev->tx_queue_len = 8; /* Window size + 1 s-frame */
+
+ memset(dev->broadcast, 0xff, 4);
+
+ 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);
+
+/*
+ * Function irda_device_init_dongle (self, type, qos)
+ *
+ * Initialize attached dongle.
+ *
+ * Important : request_module require us to call this function with
+ * a process context and irq enabled. - Jean II
+ */
+dongle_t *irda_device_dongle_init(struct net_device *dev, int type)
+{
+ struct dongle_reg *reg;
+ dongle_t *dongle = NULL;
+
+ might_sleep();
+
+ spin_lock(&dongles->hb_spinlock);
+ reg = hashbin_find(dongles, type, NULL);
+
+#ifdef CONFIG_KMOD
+ /* Try to load the module needed */
+ if (!reg && capable(CAP_SYS_MODULE)) {
+ spin_unlock(&dongles->hb_spinlock);
+
+ request_module("irda-dongle-%d", type);
+
+ spin_lock(&dongles->hb_spinlock);
+ reg = hashbin_find(dongles, type, NULL);
+ }
+#endif
+
+ if (!reg || !try_module_get(reg->owner) ) {
+ IRDA_ERROR("IrDA: Unable to find requested dongle type %x\n",
+ type);
+ goto out;
+ }
+
+ /* Allocate dongle info for this instance */
+ dongle = kmalloc(sizeof(dongle_t), GFP_KERNEL);
+ if (!dongle)
+ goto out;
+
+ memset(dongle, 0, sizeof(dongle_t));
+
+ /* Bind the registration info to this particular instance */
+ dongle->issue = reg;
+ dongle->dev = dev;
+
+ out:
+ spin_unlock(&dongles->hb_spinlock);
+ return dongle;
+}
+EXPORT_SYMBOL(irda_device_dongle_init);
+
+/*
+ * Function irda_device_dongle_cleanup (dongle)
+ */
+int irda_device_dongle_cleanup(dongle_t *dongle)
+{
+ IRDA_ASSERT(dongle != NULL, return -1;);
+
+ dongle->issue->close(dongle);
+ module_put(dongle->issue->owner);
+ kfree(dongle);
+
+ return 0;
+}
+EXPORT_SYMBOL(irda_device_dongle_cleanup);
+
+/*
+ * Function irda_device_register_dongle (dongle)
+ */
+int irda_device_register_dongle(struct dongle_reg *new)
+{
+ spin_lock(&dongles->hb_spinlock);
+ /* Check if this dongle has been registered before */
+ if (hashbin_find(dongles, new->type, NULL)) {
+ IRDA_MESSAGE("%s: Dongle type %x already registered\n",
+ __FUNCTION__, new->type);
+ } else {
+ /* Insert IrDA dongle into hashbin */
+ hashbin_insert(dongles, (irda_queue_t *) new, new->type, NULL);
+ }
+ spin_unlock(&dongles->hb_spinlock);
+
+ return 0;
+}
+EXPORT_SYMBOL(irda_device_register_dongle);
+
+/*
+ * Function irda_device_unregister_dongle (dongle)
+ *
+ * Unregister dongle, and remove dongle from list of registered dongles
+ *
+ */
+void irda_device_unregister_dongle(struct dongle_reg *dongle)
+{
+ struct dongle *node;
+
+ spin_lock(&dongles->hb_spinlock);
+ node = hashbin_remove(dongles, dongle->type, NULL);
+ if (!node)
+ IRDA_ERROR("%s: dongle not found!\n", __FUNCTION__);
+ spin_unlock(&dongles->hb_spinlock);
+}
+EXPORT_SYMBOL(irda_device_unregister_dongle);
+
+#ifdef CONFIG_ISA
+/*
+ * Function setup_dma (idev, buffer, count, mode)
+ *
+ * Setup the DMA channel. Commonly used by ISA 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