summaryrefslogtreecommitdiffstats
path: root/net/irda/irda_device.c
blob: ba40e5495f58d0dd640b7ea3eed4fdcdf9e3b6a4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
/*********************************************************************
 *
 * 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 <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;

	/* 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", __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        = 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);

/*
 * 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_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