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1da177e4 LT |
1 | /********************************************************************* |
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 | ||
32 | #include <linux/config.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/skbuff.h> | |
4fc268d2 | 36 | #include <linux/capability.h> |
1da177e4 LT |
37 | #include <linux/if.h> |
38 | #include <linux/if_ether.h> | |
39 | #include <linux/if_arp.h> | |
40 | #include <linux/netdevice.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/tty.h> | |
43 | #include <linux/kmod.h> | |
44 | #include <linux/spinlock.h> | |
45 | ||
46 | #include <asm/ioctls.h> | |
47 | #include <asm/uaccess.h> | |
48 | #include <asm/dma.h> | |
49 | #include <asm/io.h> | |
50 | ||
51 | #include <net/irda/irda_device.h> | |
52 | #include <net/irda/irlap.h> | |
53 | #include <net/irda/timer.h> | |
54 | #include <net/irda/wrapper.h> | |
55 | ||
56 | static void __irda_task_delete(struct irda_task *task); | |
57 | ||
58 | static hashbin_t *dongles = NULL; | |
59 | static hashbin_t *tasks = NULL; | |
60 | ||
61 | #ifdef CONFIG_IRDA_DEBUG | |
62 | static const char *task_state[] = { | |
63 | "IRDA_TASK_INIT", | |
64 | "IRDA_TASK_DONE", | |
65 | "IRDA_TASK_WAIT", | |
66 | "IRDA_TASK_WAIT1", | |
67 | "IRDA_TASK_WAIT2", | |
68 | "IRDA_TASK_WAIT3", | |
69 | "IRDA_TASK_CHILD_INIT", | |
70 | "IRDA_TASK_CHILD_WAIT", | |
71 | "IRDA_TASK_CHILD_DONE", | |
72 | }; | |
73 | #endif /* CONFIG_IRDA_DEBUG */ | |
74 | ||
75 | static void irda_task_timer_expired(void *data); | |
76 | ||
77 | int __init irda_device_init( void) | |
78 | { | |
79 | dongles = hashbin_new(HB_NOLOCK); | |
80 | if (dongles == NULL) { | |
81 | IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n"); | |
82 | return -ENOMEM; | |
83 | } | |
84 | spin_lock_init(&dongles->hb_spinlock); | |
85 | ||
86 | tasks = hashbin_new(HB_LOCK); | |
87 | if (tasks == NULL) { | |
88 | IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n"); | |
89 | hashbin_delete(dongles, NULL); | |
90 | return -ENOMEM; | |
91 | } | |
92 | ||
93 | /* We no longer initialise the driver ourselves here, we let | |
94 | * the system do it for us... - Jean II */ | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static void __exit leftover_dongle(void *arg) | |
100 | { | |
101 | struct dongle_reg *reg = arg; | |
102 | IRDA_WARNING("IrDA: Dongle type %x not unregistered\n", | |
103 | reg->type); | |
104 | } | |
105 | ||
106 | void __exit irda_device_cleanup(void) | |
107 | { | |
108 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__); | |
109 | ||
110 | hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete); | |
111 | ||
112 | hashbin_delete(dongles, leftover_dongle); | |
113 | } | |
114 | ||
115 | /* | |
116 | * Function irda_device_set_media_busy (self, status) | |
117 | * | |
118 | * Called when we have detected that another station is transmitting | |
119 | * in contention mode. | |
120 | */ | |
121 | void irda_device_set_media_busy(struct net_device *dev, int status) | |
122 | { | |
123 | struct irlap_cb *self; | |
124 | ||
125 | IRDA_DEBUG(4, "%s(%s)\n", __FUNCTION__, status ? "TRUE" : "FALSE"); | |
126 | ||
127 | self = (struct irlap_cb *) dev->atalk_ptr; | |
128 | ||
7e5c6bc0 JT |
129 | /* Some drivers may enable the receive interrupt before calling |
130 | * irlap_open(), or they may disable the receive interrupt | |
131 | * after calling irlap_close(). | |
132 | * The IrDA stack is protected from this in irlap_driver_rcv(). | |
133 | * However, the driver calls directly the wrapper, that calls | |
134 | * us directly. Make sure we protect ourselves. | |
135 | * Jean II */ | |
136 | if (!self || self->magic != LAP_MAGIC) | |
137 | return; | |
1da177e4 LT |
138 | |
139 | if (status) { | |
140 | self->media_busy = TRUE; | |
141 | if (status == SMALL) | |
142 | irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT); | |
143 | else | |
144 | irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT); | |
145 | IRDA_DEBUG( 4, "Media busy!\n"); | |
146 | } else { | |
147 | self->media_busy = FALSE; | |
148 | irlap_stop_mbusy_timer(self); | |
149 | } | |
150 | } | |
151 | EXPORT_SYMBOL(irda_device_set_media_busy); | |
152 | ||
153 | ||
154 | /* | |
155 | * Function irda_device_is_receiving (dev) | |
156 | * | |
157 | * Check if the device driver is currently receiving data | |
158 | * | |
159 | */ | |
160 | int irda_device_is_receiving(struct net_device *dev) | |
161 | { | |
162 | struct if_irda_req req; | |
163 | int ret; | |
164 | ||
165 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
166 | ||
167 | if (!dev->do_ioctl) { | |
168 | IRDA_ERROR("%s: do_ioctl not impl. by device driver\n", | |
169 | __FUNCTION__); | |
170 | return -1; | |
171 | } | |
172 | ||
173 | ret = dev->do_ioctl(dev, (struct ifreq *) &req, SIOCGRECEIVING); | |
174 | if (ret < 0) | |
175 | return ret; | |
176 | ||
177 | return req.ifr_receiving; | |
178 | } | |
179 | ||
180 | void irda_task_next_state(struct irda_task *task, IRDA_TASK_STATE state) | |
181 | { | |
182 | IRDA_DEBUG(2, "%s(), state = %s\n", __FUNCTION__, task_state[state]); | |
183 | ||
184 | task->state = state; | |
185 | } | |
186 | EXPORT_SYMBOL(irda_task_next_state); | |
187 | ||
188 | static void __irda_task_delete(struct irda_task *task) | |
189 | { | |
190 | del_timer(&task->timer); | |
191 | ||
192 | kfree(task); | |
193 | } | |
194 | ||
195 | void irda_task_delete(struct irda_task *task) | |
196 | { | |
197 | /* Unregister task */ | |
198 | hashbin_remove(tasks, (long) task, NULL); | |
199 | ||
200 | __irda_task_delete(task); | |
201 | } | |
202 | EXPORT_SYMBOL(irda_task_delete); | |
203 | ||
204 | /* | |
205 | * Function irda_task_kick (task) | |
206 | * | |
207 | * Tries to execute a task possible multiple times until the task is either | |
208 | * finished, or askes for a timeout. When a task is finished, we do post | |
209 | * processing, and notify the parent task, that is waiting for this task | |
210 | * to complete. | |
211 | */ | |
212 | static int irda_task_kick(struct irda_task *task) | |
213 | { | |
214 | int finished = TRUE; | |
215 | int count = 0; | |
216 | int timeout; | |
217 | ||
218 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
219 | ||
220 | IRDA_ASSERT(task != NULL, return -1;); | |
221 | IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;); | |
222 | ||
223 | /* Execute task until it's finished, or askes for a timeout */ | |
224 | do { | |
225 | timeout = task->function(task); | |
226 | if (count++ > 100) { | |
227 | IRDA_ERROR("%s: error in task handler!\n", | |
228 | __FUNCTION__); | |
229 | irda_task_delete(task); | |
230 | return TRUE; | |
231 | } | |
232 | } while ((timeout == 0) && (task->state != IRDA_TASK_DONE)); | |
233 | ||
234 | if (timeout < 0) { | |
235 | IRDA_ERROR("%s: Error executing task!\n", __FUNCTION__); | |
236 | irda_task_delete(task); | |
237 | return TRUE; | |
238 | } | |
239 | ||
240 | /* Check if we are finished */ | |
241 | if (task->state == IRDA_TASK_DONE) { | |
242 | del_timer(&task->timer); | |
243 | ||
244 | /* Do post processing */ | |
245 | if (task->finished) | |
246 | task->finished(task); | |
247 | ||
248 | /* Notify parent */ | |
249 | if (task->parent) { | |
250 | /* Check if parent is waiting for us to complete */ | |
251 | if (task->parent->state == IRDA_TASK_CHILD_WAIT) { | |
252 | task->parent->state = IRDA_TASK_CHILD_DONE; | |
253 | ||
254 | /* Stop timer now that we are here */ | |
255 | del_timer(&task->parent->timer); | |
256 | ||
257 | /* Kick parent task */ | |
258 | irda_task_kick(task->parent); | |
259 | } | |
260 | } | |
261 | irda_task_delete(task); | |
262 | } else if (timeout > 0) { | |
263 | irda_start_timer(&task->timer, timeout, (void *) task, | |
264 | irda_task_timer_expired); | |
265 | finished = FALSE; | |
266 | } else { | |
267 | IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n", | |
268 | __FUNCTION__); | |
269 | finished = FALSE; | |
270 | } | |
271 | ||
272 | return finished; | |
273 | } | |
274 | ||
275 | /* | |
276 | * Function irda_task_execute (instance, function, finished) | |
277 | * | |
278 | * This function registers and tries to execute tasks that may take some | |
279 | * time to complete. We do it this hairy way since we may have been | |
280 | * called from interrupt context, so it's not possible to use | |
281 | * schedule_timeout() | |
282 | * Two important notes : | |
283 | * o Make sure you irda_task_delete(task); in case you delete the | |
284 | * calling instance. | |
285 | * o No real need to lock when calling this function, but you may | |
286 | * want to lock within the task handler. | |
287 | * Jean II | |
288 | */ | |
289 | struct irda_task *irda_task_execute(void *instance, | |
290 | IRDA_TASK_CALLBACK function, | |
291 | IRDA_TASK_CALLBACK finished, | |
292 | struct irda_task *parent, void *param) | |
293 | { | |
294 | struct irda_task *task; | |
295 | ||
296 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
297 | ||
298 | task = kmalloc(sizeof(struct irda_task), GFP_ATOMIC); | |
299 | if (!task) | |
300 | return NULL; | |
301 | ||
302 | task->state = IRDA_TASK_INIT; | |
303 | task->instance = instance; | |
304 | task->function = function; | |
305 | task->finished = finished; | |
306 | task->parent = parent; | |
307 | task->param = param; | |
308 | task->magic = IRDA_TASK_MAGIC; | |
309 | ||
310 | init_timer(&task->timer); | |
311 | ||
312 | /* Register task */ | |
313 | hashbin_insert(tasks, (irda_queue_t *) task, (long) task, NULL); | |
314 | ||
315 | /* No time to waste, so lets get going! */ | |
316 | return irda_task_kick(task) ? NULL : task; | |
317 | } | |
318 | EXPORT_SYMBOL(irda_task_execute); | |
319 | ||
320 | /* | |
321 | * Function irda_task_timer_expired (data) | |
322 | * | |
323 | * Task time has expired. We now try to execute task (again), and restart | |
324 | * the timer if the task has not finished yet | |
325 | */ | |
326 | static void irda_task_timer_expired(void *data) | |
327 | { | |
328 | struct irda_task *task; | |
329 | ||
330 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__); | |
331 | ||
332 | task = (struct irda_task *) data; | |
333 | ||
334 | irda_task_kick(task); | |
335 | } | |
336 | ||
337 | /* | |
338 | * Function irda_device_setup (dev) | |
339 | * | |
340 | * This function should be used by low level device drivers in a similar way | |
341 | * as ether_setup() is used by normal network device drivers | |
342 | */ | |
343 | static void irda_device_setup(struct net_device *dev) | |
344 | { | |
345 | dev->hard_header_len = 0; | |
346 | dev->addr_len = 0; | |
347 | ||
348 | dev->type = ARPHRD_IRDA; | |
349 | dev->tx_queue_len = 8; /* Window size + 1 s-frame */ | |
350 | ||
351 | memset(dev->broadcast, 0xff, 4); | |
352 | ||
353 | dev->mtu = 2048; | |
354 | dev->flags = IFF_NOARP; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Funciton alloc_irdadev | |
359 | * Allocates and sets up an IRDA device in a manner similar to | |
360 | * alloc_etherdev. | |
361 | */ | |
362 | struct net_device *alloc_irdadev(int sizeof_priv) | |
363 | { | |
364 | return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup); | |
365 | } | |
366 | EXPORT_SYMBOL(alloc_irdadev); | |
367 | ||
368 | /* | |
369 | * Function irda_device_init_dongle (self, type, qos) | |
370 | * | |
371 | * Initialize attached dongle. | |
372 | * | |
373 | * Important : request_module require us to call this function with | |
374 | * a process context and irq enabled. - Jean II | |
375 | */ | |
376 | dongle_t *irda_device_dongle_init(struct net_device *dev, int type) | |
377 | { | |
378 | struct dongle_reg *reg; | |
379 | dongle_t *dongle = NULL; | |
380 | ||
381 | might_sleep(); | |
382 | ||
383 | spin_lock(&dongles->hb_spinlock); | |
384 | reg = hashbin_find(dongles, type, NULL); | |
385 | ||
386 | #ifdef CONFIG_KMOD | |
387 | /* Try to load the module needed */ | |
388 | if (!reg && capable(CAP_SYS_MODULE)) { | |
389 | spin_unlock(&dongles->hb_spinlock); | |
390 | ||
391 | request_module("irda-dongle-%d", type); | |
392 | ||
393 | spin_lock(&dongles->hb_spinlock); | |
394 | reg = hashbin_find(dongles, type, NULL); | |
395 | } | |
396 | #endif | |
397 | ||
398 | if (!reg || !try_module_get(reg->owner) ) { | |
399 | IRDA_ERROR("IrDA: Unable to find requested dongle type %x\n", | |
400 | type); | |
401 | goto out; | |
402 | } | |
403 | ||
404 | /* Allocate dongle info for this instance */ | |
405 | dongle = kmalloc(sizeof(dongle_t), GFP_KERNEL); | |
406 | if (!dongle) | |
407 | goto out; | |
408 | ||
409 | memset(dongle, 0, sizeof(dongle_t)); | |
410 | ||
411 | /* Bind the registration info to this particular instance */ | |
412 | dongle->issue = reg; | |
413 | dongle->dev = dev; | |
414 | ||
415 | out: | |
416 | spin_unlock(&dongles->hb_spinlock); | |
417 | return dongle; | |
418 | } | |
419 | EXPORT_SYMBOL(irda_device_dongle_init); | |
420 | ||
421 | /* | |
422 | * Function irda_device_dongle_cleanup (dongle) | |
423 | */ | |
424 | int irda_device_dongle_cleanup(dongle_t *dongle) | |
425 | { | |
426 | IRDA_ASSERT(dongle != NULL, return -1;); | |
427 | ||
428 | dongle->issue->close(dongle); | |
429 | module_put(dongle->issue->owner); | |
430 | kfree(dongle); | |
431 | ||
432 | return 0; | |
433 | } | |
434 | EXPORT_SYMBOL(irda_device_dongle_cleanup); | |
435 | ||
436 | /* | |
437 | * Function irda_device_register_dongle (dongle) | |
438 | */ | |
439 | int irda_device_register_dongle(struct dongle_reg *new) | |
440 | { | |
441 | spin_lock(&dongles->hb_spinlock); | |
442 | /* Check if this dongle has been registered before */ | |
443 | if (hashbin_find(dongles, new->type, NULL)) { | |
444 | IRDA_MESSAGE("%s: Dongle type %x already registered\n", | |
445 | __FUNCTION__, new->type); | |
446 | } else { | |
447 | /* Insert IrDA dongle into hashbin */ | |
448 | hashbin_insert(dongles, (irda_queue_t *) new, new->type, NULL); | |
449 | } | |
450 | spin_unlock(&dongles->hb_spinlock); | |
451 | ||
452 | return 0; | |
453 | } | |
454 | EXPORT_SYMBOL(irda_device_register_dongle); | |
455 | ||
456 | /* | |
457 | * Function irda_device_unregister_dongle (dongle) | |
458 | * | |
459 | * Unregister dongle, and remove dongle from list of registered dongles | |
460 | * | |
461 | */ | |
462 | void irda_device_unregister_dongle(struct dongle_reg *dongle) | |
463 | { | |
464 | struct dongle *node; | |
465 | ||
466 | spin_lock(&dongles->hb_spinlock); | |
467 | node = hashbin_remove(dongles, dongle->type, NULL); | |
468 | if (!node) | |
469 | IRDA_ERROR("%s: dongle not found!\n", __FUNCTION__); | |
470 | spin_unlock(&dongles->hb_spinlock); | |
471 | } | |
472 | EXPORT_SYMBOL(irda_device_unregister_dongle); | |
473 | ||
56c3b7d7 | 474 | #ifdef CONFIG_ISA_DMA_API |
1da177e4 LT |
475 | /* |
476 | * Function setup_dma (idev, buffer, count, mode) | |
477 | * | |
b6d9a5d8 | 478 | * Setup the DMA channel. Commonly used by LPC FIR drivers |
1da177e4 LT |
479 | * |
480 | */ | |
481 | void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode) | |
482 | { | |
483 | unsigned long flags; | |
484 | ||
485 | flags = claim_dma_lock(); | |
486 | ||
487 | disable_dma(channel); | |
488 | clear_dma_ff(channel); | |
489 | set_dma_mode(channel, mode); | |
490 | set_dma_addr(channel, buffer); | |
491 | set_dma_count(channel, count); | |
492 | enable_dma(channel); | |
493 | ||
494 | release_dma_lock(flags); | |
495 | } | |
496 | EXPORT_SYMBOL(irda_setup_dma); | |
56c3b7d7 | 497 | #endif |