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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*********************************************************************
2 *
3 * Filename: irda_device.c
4 * Version: 0.9
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>
11 *
12 * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
13 * Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
14 *
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.
19 *
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.
24 *
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,
28 * MA 02111-1307 USA
29 *
30 ********************************************************************/
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/string.h>
33#include <linux/proc_fs.h>
34#include <linux/skbuff.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080035#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/if.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>
44
45#include <asm/ioctls.h>
46#include <asm/uaccess.h>
47#include <asm/dma.h>
48#include <asm/io.h>
49
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>
54
55static void __irda_task_delete(struct irda_task *task);
56
57static hashbin_t *dongles = NULL;
58static hashbin_t *tasks = NULL;
59
60#ifdef CONFIG_IRDA_DEBUG
61static const char *task_state[] = {
62 "IRDA_TASK_INIT",
63 "IRDA_TASK_DONE",
64 "IRDA_TASK_WAIT",
65 "IRDA_TASK_WAIT1",
66 "IRDA_TASK_WAIT2",
67 "IRDA_TASK_WAIT3",
68 "IRDA_TASK_CHILD_INIT",
69 "IRDA_TASK_CHILD_WAIT",
70 "IRDA_TASK_CHILD_DONE",
71};
72#endif /* CONFIG_IRDA_DEBUG */
73
74static void irda_task_timer_expired(void *data);
75
76int __init irda_device_init( void)
77{
78 dongles = hashbin_new(HB_NOLOCK);
79 if (dongles == NULL) {
80 IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n");
81 return -ENOMEM;
82 }
83 spin_lock_init(&dongles->hb_spinlock);
84
85 tasks = hashbin_new(HB_LOCK);
86 if (tasks == NULL) {
87 IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n");
88 hashbin_delete(dongles, NULL);
89 return -ENOMEM;
90 }
91
92 /* We no longer initialise the driver ourselves here, we let
93 * the system do it for us... - Jean II */
94
95 return 0;
96}
97
98static void __exit leftover_dongle(void *arg)
99{
100 struct dongle_reg *reg = arg;
101 IRDA_WARNING("IrDA: Dongle type %x not unregistered\n",
102 reg->type);
103}
104
105void __exit irda_device_cleanup(void)
106{
107 IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
108
109 hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete);
110
111 hashbin_delete(dongles, leftover_dongle);
112}
113
114/*
115 * Function irda_device_set_media_busy (self, status)
116 *
117 * Called when we have detected that another station is transmitting
118 * in contention mode.
119 */
120void irda_device_set_media_busy(struct net_device *dev, int status)
121{
122 struct irlap_cb *self;
123
124 IRDA_DEBUG(4, "%s(%s)\n", __FUNCTION__, status ? "TRUE" : "FALSE");
125
126 self = (struct irlap_cb *) dev->atalk_ptr;
127
Jean Tourrilhes7e5c6bc2005-04-16 15:24:11 -0700128 /* Some drivers may enable the receive interrupt before calling
129 * irlap_open(), or they may disable the receive interrupt
130 * after calling irlap_close().
131 * The IrDA stack is protected from this in irlap_driver_rcv().
132 * However, the driver calls directly the wrapper, that calls
133 * us directly. Make sure we protect ourselves.
134 * Jean II */
135 if (!self || self->magic != LAP_MAGIC)
136 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 if (status) {
139 self->media_busy = TRUE;
140 if (status == SMALL)
141 irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT);
142 else
143 irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT);
144 IRDA_DEBUG( 4, "Media busy!\n");
145 } else {
146 self->media_busy = FALSE;
147 irlap_stop_mbusy_timer(self);
148 }
149}
150EXPORT_SYMBOL(irda_device_set_media_busy);
151
152
153/*
154 * Function irda_device_is_receiving (dev)
155 *
156 * Check if the device driver is currently receiving data
157 *
158 */
159int irda_device_is_receiving(struct net_device *dev)
160{
161 struct if_irda_req req;
162 int ret;
163
164 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
165
166 if (!dev->do_ioctl) {
167 IRDA_ERROR("%s: do_ioctl not impl. by device driver\n",
168 __FUNCTION__);
169 return -1;
170 }
171
172 ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING);
173 if (ret < 0)
174 return ret;
175
176 return req.ifr_receiving;
177}
178
179void irda_task_next_state(struct irda_task *task, IRDA_TASK_STATE state)
180{
181 IRDA_DEBUG(2, "%s(), state = %s\n", __FUNCTION__, task_state[state]);
182
183 task->state = state;
184}
185EXPORT_SYMBOL(irda_task_next_state);
186
187static void __irda_task_delete(struct irda_task *task)
188{
189 del_timer(&task->timer);
190
191 kfree(task);
192}
193
194void irda_task_delete(struct irda_task *task)
195{
196 /* Unregister task */
197 hashbin_remove(tasks, (long) task, NULL);
198
199 __irda_task_delete(task);
200}
201EXPORT_SYMBOL(irda_task_delete);
202
203/*
204 * Function irda_task_kick (task)
205 *
206 * Tries to execute a task possible multiple times until the task is either
207 * finished, or askes for a timeout. When a task is finished, we do post
208 * processing, and notify the parent task, that is waiting for this task
209 * to complete.
210 */
211static int irda_task_kick(struct irda_task *task)
212{
213 int finished = TRUE;
214 int count = 0;
215 int timeout;
216
217 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
218
219 IRDA_ASSERT(task != NULL, return -1;);
220 IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
221
222 /* Execute task until it's finished, or askes for a timeout */
223 do {
224 timeout = task->function(task);
225 if (count++ > 100) {
226 IRDA_ERROR("%s: error in task handler!\n",
227 __FUNCTION__);
228 irda_task_delete(task);
229 return TRUE;
230 }
231 } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
232
233 if (timeout < 0) {
234 IRDA_ERROR("%s: Error executing task!\n", __FUNCTION__);
235 irda_task_delete(task);
236 return TRUE;
237 }
238
239 /* Check if we are finished */
240 if (task->state == IRDA_TASK_DONE) {
241 del_timer(&task->timer);
242
243 /* Do post processing */
244 if (task->finished)
245 task->finished(task);
246
247 /* Notify parent */
248 if (task->parent) {
249 /* Check if parent is waiting for us to complete */
250 if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
251 task->parent->state = IRDA_TASK_CHILD_DONE;
252
253 /* Stop timer now that we are here */
254 del_timer(&task->parent->timer);
255
256 /* Kick parent task */
257 irda_task_kick(task->parent);
258 }
259 }
260 irda_task_delete(task);
261 } else if (timeout > 0) {
262 irda_start_timer(&task->timer, timeout, (void *) task,
263 irda_task_timer_expired);
264 finished = FALSE;
265 } else {
266 IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n",
267 __FUNCTION__);
268 finished = FALSE;
269 }
270
271 return finished;
272}
273
274/*
275 * Function irda_task_execute (instance, function, finished)
276 *
277 * This function registers and tries to execute tasks that may take some
278 * time to complete. We do it this hairy way since we may have been
279 * called from interrupt context, so it's not possible to use
280 * schedule_timeout()
281 * Two important notes :
282 * o Make sure you irda_task_delete(task); in case you delete the
283 * calling instance.
284 * o No real need to lock when calling this function, but you may
285 * want to lock within the task handler.
286 * Jean II
287 */
288struct irda_task *irda_task_execute(void *instance,
289 IRDA_TASK_CALLBACK function,
290 IRDA_TASK_CALLBACK finished,
291 struct irda_task *parent, void *param)
292{
293 struct irda_task *task;
294
295 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
296
297 task = kmalloc(sizeof(struct irda_task), GFP_ATOMIC);
298 if (!task)
299 return NULL;
300
301 task->state = IRDA_TASK_INIT;
302 task->instance = instance;
303 task->function = function;
304 task->finished = finished;
305 task->parent = parent;
306 task->param = param;
307 task->magic = IRDA_TASK_MAGIC;
308
309 init_timer(&task->timer);
310
311 /* Register task */
312 hashbin_insert(tasks, (irda_queue_t *) task, (long) task, NULL);
313
314 /* No time to waste, so lets get going! */
315 return irda_task_kick(task) ? NULL : task;
316}
317EXPORT_SYMBOL(irda_task_execute);
318
319/*
320 * Function irda_task_timer_expired (data)
321 *
322 * Task time has expired. We now try to execute task (again), and restart
323 * the timer if the task has not finished yet
324 */
325static void irda_task_timer_expired(void *data)
326{
327 struct irda_task *task;
328
329 IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
330
331 task = (struct irda_task *) data;
332
333 irda_task_kick(task);
334}
335
336/*
337 * Function irda_device_setup (dev)
338 *
339 * This function should be used by low level device drivers in a similar way
340 * as ether_setup() is used by normal network device drivers
341 */
342static void irda_device_setup(struct net_device *dev)
343{
344 dev->hard_header_len = 0;
Samuel Ortizd93077f2006-02-09 16:58:46 -0800345 dev->addr_len = LAP_ALEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
347 dev->type = ARPHRD_IRDA;
348 dev->tx_queue_len = 8; /* Window size + 1 s-frame */
349
Samuel Ortizd93077f2006-02-09 16:58:46 -0800350 memset(dev->broadcast, 0xff, LAP_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352 dev->mtu = 2048;
353 dev->flags = IFF_NOARP;
354}
355
356/*
357 * Funciton alloc_irdadev
358 * Allocates and sets up an IRDA device in a manner similar to
359 * alloc_etherdev.
360 */
361struct net_device *alloc_irdadev(int sizeof_priv)
362{
363 return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup);
364}
365EXPORT_SYMBOL(alloc_irdadev);
366
367/*
368 * Function irda_device_init_dongle (self, type, qos)
369 *
370 * Initialize attached dongle.
371 *
372 * Important : request_module require us to call this function with
373 * a process context and irq enabled. - Jean II
374 */
375dongle_t *irda_device_dongle_init(struct net_device *dev, int type)
376{
377 struct dongle_reg *reg;
378 dongle_t *dongle = NULL;
379
380 might_sleep();
381
382 spin_lock(&dongles->hb_spinlock);
383 reg = hashbin_find(dongles, type, NULL);
384
385#ifdef CONFIG_KMOD
386 /* Try to load the module needed */
387 if (!reg && capable(CAP_SYS_MODULE)) {
388 spin_unlock(&dongles->hb_spinlock);
389
390 request_module("irda-dongle-%d", type);
391
392 spin_lock(&dongles->hb_spinlock);
393 reg = hashbin_find(dongles, type, NULL);
394 }
395#endif
396
397 if (!reg || !try_module_get(reg->owner) ) {
398 IRDA_ERROR("IrDA: Unable to find requested dongle type %x\n",
399 type);
400 goto out;
401 }
402
403 /* Allocate dongle info for this instance */
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700404 dongle = kzalloc(sizeof(dongle_t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 if (!dongle)
406 goto out;
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 /* Bind the registration info to this particular instance */
409 dongle->issue = reg;
410 dongle->dev = dev;
411
412 out:
413 spin_unlock(&dongles->hb_spinlock);
414 return dongle;
415}
416EXPORT_SYMBOL(irda_device_dongle_init);
417
418/*
419 * Function irda_device_dongle_cleanup (dongle)
420 */
421int irda_device_dongle_cleanup(dongle_t *dongle)
422{
423 IRDA_ASSERT(dongle != NULL, return -1;);
424
425 dongle->issue->close(dongle);
426 module_put(dongle->issue->owner);
427 kfree(dongle);
428
429 return 0;
430}
431EXPORT_SYMBOL(irda_device_dongle_cleanup);
432
433/*
434 * Function irda_device_register_dongle (dongle)
435 */
436int irda_device_register_dongle(struct dongle_reg *new)
437{
438 spin_lock(&dongles->hb_spinlock);
439 /* Check if this dongle has been registered before */
440 if (hashbin_find(dongles, new->type, NULL)) {
441 IRDA_MESSAGE("%s: Dongle type %x already registered\n",
442 __FUNCTION__, new->type);
443 } else {
444 /* Insert IrDA dongle into hashbin */
445 hashbin_insert(dongles, (irda_queue_t *) new, new->type, NULL);
446 }
447 spin_unlock(&dongles->hb_spinlock);
448
449 return 0;
450}
451EXPORT_SYMBOL(irda_device_register_dongle);
452
453/*
454 * Function irda_device_unregister_dongle (dongle)
455 *
456 * Unregister dongle, and remove dongle from list of registered dongles
457 *
458 */
459void irda_device_unregister_dongle(struct dongle_reg *dongle)
460{
461 struct dongle *node;
462
463 spin_lock(&dongles->hb_spinlock);
464 node = hashbin_remove(dongles, dongle->type, NULL);
465 if (!node)
466 IRDA_ERROR("%s: dongle not found!\n", __FUNCTION__);
467 spin_unlock(&dongles->hb_spinlock);
468}
469EXPORT_SYMBOL(irda_device_unregister_dongle);
470
Al Viro56c3b7d2005-05-04 05:39:52 +0100471#ifdef CONFIG_ISA_DMA_API
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472/*
473 * Function setup_dma (idev, buffer, count, mode)
474 *
Andi Kleenb6d9a5d2005-04-16 15:24:56 -0700475 * Setup the DMA channel. Commonly used by LPC FIR drivers
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 *
477 */
478void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
479{
480 unsigned long flags;
481
482 flags = claim_dma_lock();
483
484 disable_dma(channel);
485 clear_dma_ff(channel);
486 set_dma_mode(channel, mode);
487 set_dma_addr(channel, buffer);
488 set_dma_count(channel, count);
489 enable_dma(channel);
490
491 release_dma_lock(flags);
492}
493EXPORT_SYMBOL(irda_setup_dma);
Al Viro56c3b7d2005-05-04 05:39:52 +0100494#endif