1 /*********************************************************************
3 * Filename: irda_device.c
5 * Description: Utility functions used by the device drivers
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sat Oct 9 09:22:27 1999
9 * Modified at: Sun Jan 23 17:41:24 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
12 * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
13 * Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 ********************************************************************/
32 #include <linux/string.h>
33 #include <linux/proc_fs.h>
34 #include <linux/skbuff.h>
35 #include <linux/capability.h>
37 #include <linux/if_ether.h>
38 #include <linux/if_arp.h>
39 #include <linux/netdevice.h>
40 #include <linux/init.h>
41 #include <linux/tty.h>
42 #include <linux/kmod.h>
43 #include <linux/spinlock.h>
45 #include <asm/ioctls.h>
46 #include <asm/uaccess.h>
50 #include <net/irda/irda_device.h>
51 #include <net/irda/irlap.h>
52 #include <net/irda/timer.h>
53 #include <net/irda/wrapper.h>
55 static void __irda_task_delete(struct irda_task *task);
57 static hashbin_t *dongles = NULL;
58 static hashbin_t *tasks = NULL;
60 static void irda_task_timer_expired(void *data);
62 int __init irda_device_init( void)
64 dongles = hashbin_new(HB_NOLOCK);
65 if (dongles == NULL) {
66 IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n");
69 spin_lock_init(&dongles->hb_spinlock);
71 tasks = hashbin_new(HB_LOCK);
73 IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n");
74 hashbin_delete(dongles, NULL);
78 /* We no longer initialise the driver ourselves here, we let
79 * the system do it for us... - Jean II */
84 static void leftover_dongle(void *arg)
86 struct dongle_reg *reg = arg;
87 IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
91 void irda_device_cleanup(void)
93 IRDA_DEBUG(4, "%s()\n", __func__);
95 hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete);
97 hashbin_delete(dongles, leftover_dongle);
101 * Function irda_device_set_media_busy (self, status)
103 * Called when we have detected that another station is transmitting
104 * in contention mode.
106 void irda_device_set_media_busy(struct net_device *dev, int status)
108 struct irlap_cb *self;
110 IRDA_DEBUG(4, "%s(%s)\n", __func__, status ? "TRUE" : "FALSE");
112 self = (struct irlap_cb *) dev->atalk_ptr;
114 /* Some drivers may enable the receive interrupt before calling
115 * irlap_open(), or they may disable the receive interrupt
116 * after calling irlap_close().
117 * The IrDA stack is protected from this in irlap_driver_rcv().
118 * However, the driver calls directly the wrapper, that calls
119 * us directly. Make sure we protect ourselves.
121 if (!self || self->magic != LAP_MAGIC)
125 self->media_busy = TRUE;
127 irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT);
129 irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT);
130 IRDA_DEBUG( 4, "Media busy!\n");
132 self->media_busy = FALSE;
133 irlap_stop_mbusy_timer(self);
136 EXPORT_SYMBOL(irda_device_set_media_busy);
140 * Function irda_device_is_receiving (dev)
142 * Check if the device driver is currently receiving data
145 int irda_device_is_receiving(struct net_device *dev)
147 struct if_irda_req req;
150 IRDA_DEBUG(2, "%s()\n", __func__);
152 if (!dev->do_ioctl) {
153 IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
158 ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING);
162 return req.ifr_receiving;
165 static void __irda_task_delete(struct irda_task *task)
167 del_timer(&task->timer);
172 static void irda_task_delete(struct irda_task *task)
174 /* Unregister task */
175 hashbin_remove(tasks, (long) task, NULL);
177 __irda_task_delete(task);
181 * Function irda_task_kick (task)
183 * Tries to execute a task possible multiple times until the task is either
184 * finished, or askes for a timeout. When a task is finished, we do post
185 * processing, and notify the parent task, that is waiting for this task
188 static int irda_task_kick(struct irda_task *task)
194 IRDA_DEBUG(2, "%s()\n", __func__);
196 IRDA_ASSERT(task != NULL, return -1;);
197 IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
199 /* Execute task until it's finished, or askes for a timeout */
201 timeout = task->function(task);
203 IRDA_ERROR("%s: error in task handler!\n",
205 irda_task_delete(task);
208 } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
211 IRDA_ERROR("%s: Error executing task!\n", __func__);
212 irda_task_delete(task);
216 /* Check if we are finished */
217 if (task->state == IRDA_TASK_DONE) {
218 del_timer(&task->timer);
220 /* Do post processing */
222 task->finished(task);
226 /* Check if parent is waiting for us to complete */
227 if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
228 task->parent->state = IRDA_TASK_CHILD_DONE;
230 /* Stop timer now that we are here */
231 del_timer(&task->parent->timer);
233 /* Kick parent task */
234 irda_task_kick(task->parent);
237 irda_task_delete(task);
238 } else if (timeout > 0) {
239 irda_start_timer(&task->timer, timeout, (void *) task,
240 irda_task_timer_expired);
243 IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n",
252 * Function irda_task_timer_expired (data)
254 * Task time has expired. We now try to execute task (again), and restart
255 * the timer if the task has not finished yet
257 static void irda_task_timer_expired(void *data)
259 struct irda_task *task;
261 IRDA_DEBUG(2, "%s()\n", __func__);
263 task = (struct irda_task *) data;
265 irda_task_kick(task);
269 * Function irda_device_setup (dev)
271 * This function should be used by low level device drivers in a similar way
272 * as ether_setup() is used by normal network device drivers
274 static void irda_device_setup(struct net_device *dev)
276 dev->hard_header_len = 0;
277 dev->addr_len = LAP_ALEN;
279 dev->type = ARPHRD_IRDA;
280 dev->tx_queue_len = 8; /* Window size + 1 s-frame */
282 memset(dev->broadcast, 0xff, LAP_ALEN);
285 dev->flags = IFF_NOARP;
289 * Funciton alloc_irdadev
290 * Allocates and sets up an IRDA device in a manner similar to
293 struct net_device *alloc_irdadev(int sizeof_priv)
295 return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
297 EXPORT_SYMBOL(alloc_irdadev);
299 #ifdef CONFIG_ISA_DMA_API
301 * Function setup_dma (idev, buffer, count, mode)
303 * Setup the DMA channel. Commonly used by LPC FIR drivers
306 void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
310 flags = claim_dma_lock();
312 disable_dma(channel);
313 clear_dma_ff(channel);
314 set_dma_mode(channel, mode);
315 set_dma_addr(channel, buffer);
316 set_dma_count(channel, count);
319 release_dma_lock(flags);
321 EXPORT_SYMBOL(irda_setup_dma);