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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 | ||
1da177e4 LT |
32 | #include <linux/string.h> |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/skbuff.h> | |
4fc268d2 | 35 | #include <linux/capability.h> |
1da177e4 LT |
36 | #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> | |
5a0e3ad6 | 44 | #include <linux/slab.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
61 | static void irda_task_timer_expired(void *data); |
62 | ||
63 | int __init irda_device_init( void) | |
64 | { | |
65 | dongles = hashbin_new(HB_NOLOCK); | |
66 | if (dongles == NULL) { | |
67 | IRDA_WARNING("IrDA: Can't allocate dongles hashbin!\n"); | |
68 | return -ENOMEM; | |
69 | } | |
70 | spin_lock_init(&dongles->hb_spinlock); | |
71 | ||
72 | tasks = hashbin_new(HB_LOCK); | |
73 | if (tasks == NULL) { | |
74 | IRDA_WARNING("IrDA: Can't allocate tasks hashbin!\n"); | |
75 | hashbin_delete(dongles, NULL); | |
76 | return -ENOMEM; | |
77 | } | |
78 | ||
79 | /* We no longer initialise the driver ourselves here, we let | |
80 | * the system do it for us... - Jean II */ | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
75a69ac6 | 85 | static void leftover_dongle(void *arg) |
1da177e4 LT |
86 | { |
87 | struct dongle_reg *reg = arg; | |
88 | IRDA_WARNING("IrDA: Dongle type %x not unregistered\n", | |
89 | reg->type); | |
90 | } | |
91 | ||
75a69ac6 | 92 | void irda_device_cleanup(void) |
1da177e4 | 93 | { |
0dc47877 | 94 | IRDA_DEBUG(4, "%s()\n", __func__); |
1da177e4 LT |
95 | |
96 | hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete); | |
97 | ||
98 | hashbin_delete(dongles, leftover_dongle); | |
99 | } | |
100 | ||
101 | /* | |
102 | * Function irda_device_set_media_busy (self, status) | |
103 | * | |
104 | * Called when we have detected that another station is transmitting | |
105 | * in contention mode. | |
106 | */ | |
107 | void irda_device_set_media_busy(struct net_device *dev, int status) | |
108 | { | |
109 | struct irlap_cb *self; | |
110 | ||
0dc47877 | 111 | IRDA_DEBUG(4, "%s(%s)\n", __func__, status ? "TRUE" : "FALSE"); |
1da177e4 LT |
112 | |
113 | self = (struct irlap_cb *) dev->atalk_ptr; | |
114 | ||
7e5c6bc0 JT |
115 | /* Some drivers may enable the receive interrupt before calling |
116 | * irlap_open(), or they may disable the receive interrupt | |
117 | * after calling irlap_close(). | |
118 | * The IrDA stack is protected from this in irlap_driver_rcv(). | |
119 | * However, the driver calls directly the wrapper, that calls | |
120 | * us directly. Make sure we protect ourselves. | |
121 | * Jean II */ | |
122 | if (!self || self->magic != LAP_MAGIC) | |
123 | return; | |
1da177e4 LT |
124 | |
125 | if (status) { | |
126 | self->media_busy = TRUE; | |
127 | if (status == SMALL) | |
128 | irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT); | |
129 | else | |
130 | irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT); | |
131 | IRDA_DEBUG( 4, "Media busy!\n"); | |
132 | } else { | |
133 | self->media_busy = FALSE; | |
134 | irlap_stop_mbusy_timer(self); | |
135 | } | |
136 | } | |
137 | EXPORT_SYMBOL(irda_device_set_media_busy); | |
138 | ||
139 | ||
140 | /* | |
141 | * Function irda_device_is_receiving (dev) | |
142 | * | |
143 | * Check if the device driver is currently receiving data | |
144 | * | |
145 | */ | |
146 | int irda_device_is_receiving(struct net_device *dev) | |
147 | { | |
148 | struct if_irda_req req; | |
149 | int ret; | |
150 | ||
0dc47877 | 151 | IRDA_DEBUG(2, "%s()\n", __func__); |
1da177e4 | 152 | |
92bcd4fe | 153 | if (!dev->netdev_ops->ndo_do_ioctl) { |
1da177e4 | 154 | IRDA_ERROR("%s: do_ioctl not impl. by device driver\n", |
0dc47877 | 155 | __func__); |
1da177e4 LT |
156 | return -1; |
157 | } | |
158 | ||
92bcd4fe SH |
159 | ret = (dev->netdev_ops->ndo_do_ioctl)(dev, (struct ifreq *) &req, |
160 | SIOCGRECEIVING); | |
1da177e4 LT |
161 | if (ret < 0) |
162 | return ret; | |
163 | ||
164 | return req.ifr_receiving; | |
165 | } | |
166 | ||
1da177e4 LT |
167 | static void __irda_task_delete(struct irda_task *task) |
168 | { | |
169 | del_timer(&task->timer); | |
170 | ||
171 | kfree(task); | |
172 | } | |
173 | ||
e9888f54 | 174 | static void irda_task_delete(struct irda_task *task) |
1da177e4 LT |
175 | { |
176 | /* Unregister task */ | |
177 | hashbin_remove(tasks, (long) task, NULL); | |
178 | ||
179 | __irda_task_delete(task); | |
180 | } | |
1da177e4 LT |
181 | |
182 | /* | |
183 | * Function irda_task_kick (task) | |
184 | * | |
185 | * Tries to execute a task possible multiple times until the task is either | |
186 | * finished, or askes for a timeout. When a task is finished, we do post | |
187 | * processing, and notify the parent task, that is waiting for this task | |
188 | * to complete. | |
189 | */ | |
190 | static int irda_task_kick(struct irda_task *task) | |
191 | { | |
192 | int finished = TRUE; | |
193 | int count = 0; | |
194 | int timeout; | |
195 | ||
0dc47877 | 196 | IRDA_DEBUG(2, "%s()\n", __func__); |
1da177e4 LT |
197 | |
198 | IRDA_ASSERT(task != NULL, return -1;); | |
199 | IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;); | |
200 | ||
201 | /* Execute task until it's finished, or askes for a timeout */ | |
202 | do { | |
203 | timeout = task->function(task); | |
204 | if (count++ > 100) { | |
205 | IRDA_ERROR("%s: error in task handler!\n", | |
0dc47877 | 206 | __func__); |
1da177e4 LT |
207 | irda_task_delete(task); |
208 | return TRUE; | |
209 | } | |
210 | } while ((timeout == 0) && (task->state != IRDA_TASK_DONE)); | |
211 | ||
212 | if (timeout < 0) { | |
0dc47877 | 213 | IRDA_ERROR("%s: Error executing task!\n", __func__); |
1da177e4 LT |
214 | irda_task_delete(task); |
215 | return TRUE; | |
216 | } | |
217 | ||
218 | /* Check if we are finished */ | |
219 | if (task->state == IRDA_TASK_DONE) { | |
220 | del_timer(&task->timer); | |
221 | ||
222 | /* Do post processing */ | |
223 | if (task->finished) | |
224 | task->finished(task); | |
225 | ||
226 | /* Notify parent */ | |
227 | if (task->parent) { | |
228 | /* Check if parent is waiting for us to complete */ | |
229 | if (task->parent->state == IRDA_TASK_CHILD_WAIT) { | |
230 | task->parent->state = IRDA_TASK_CHILD_DONE; | |
231 | ||
232 | /* Stop timer now that we are here */ | |
233 | del_timer(&task->parent->timer); | |
234 | ||
235 | /* Kick parent task */ | |
236 | irda_task_kick(task->parent); | |
237 | } | |
238 | } | |
239 | irda_task_delete(task); | |
240 | } else if (timeout > 0) { | |
241 | irda_start_timer(&task->timer, timeout, (void *) task, | |
242 | irda_task_timer_expired); | |
243 | finished = FALSE; | |
244 | } else { | |
245 | IRDA_DEBUG(0, "%s(), not finished, and no timeout!\n", | |
0dc47877 | 246 | __func__); |
1da177e4 LT |
247 | finished = FALSE; |
248 | } | |
249 | ||
250 | return finished; | |
251 | } | |
252 | ||
1da177e4 LT |
253 | /* |
254 | * Function irda_task_timer_expired (data) | |
255 | * | |
256 | * Task time has expired. We now try to execute task (again), and restart | |
257 | * the timer if the task has not finished yet | |
258 | */ | |
259 | static void irda_task_timer_expired(void *data) | |
260 | { | |
261 | struct irda_task *task; | |
262 | ||
0dc47877 | 263 | IRDA_DEBUG(2, "%s()\n", __func__); |
1da177e4 | 264 | |
ea110733 | 265 | task = data; |
1da177e4 LT |
266 | |
267 | irda_task_kick(task); | |
268 | } | |
269 | ||
270 | /* | |
271 | * Function irda_device_setup (dev) | |
272 | * | |
273 | * This function should be used by low level device drivers in a similar way | |
274 | * as ether_setup() is used by normal network device drivers | |
275 | */ | |
276 | static void irda_device_setup(struct net_device *dev) | |
277 | { | |
6819bc2e YH |
278 | dev->hard_header_len = 0; |
279 | dev->addr_len = LAP_ALEN; | |
1da177e4 | 280 | |
6819bc2e YH |
281 | dev->type = ARPHRD_IRDA; |
282 | dev->tx_queue_len = 8; /* Window size + 1 s-frame */ | |
1da177e4 | 283 | |
d93077fb | 284 | memset(dev->broadcast, 0xff, LAP_ALEN); |
1da177e4 LT |
285 | |
286 | dev->mtu = 2048; | |
287 | dev->flags = IFF_NOARP; | |
288 | } | |
289 | ||
290 | /* | |
6819bc2e | 291 | * Funciton alloc_irdadev |
1da177e4 LT |
292 | * Allocates and sets up an IRDA device in a manner similar to |
293 | * alloc_etherdev. | |
294 | */ | |
295 | struct net_device *alloc_irdadev(int sizeof_priv) | |
296 | { | |
297 | return alloc_netdev(sizeof_priv, "irda%d", irda_device_setup); | |
298 | } | |
299 | EXPORT_SYMBOL(alloc_irdadev); | |
300 | ||
56c3b7d7 | 301 | #ifdef CONFIG_ISA_DMA_API |
1da177e4 LT |
302 | /* |
303 | * Function setup_dma (idev, buffer, count, mode) | |
304 | * | |
b6d9a5d8 | 305 | * Setup the DMA channel. Commonly used by LPC FIR drivers |
1da177e4 LT |
306 | * |
307 | */ | |
308 | void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode) | |
309 | { | |
310 | unsigned long flags; | |
311 | ||
312 | flags = claim_dma_lock(); | |
313 | ||
314 | disable_dma(channel); | |
315 | clear_dma_ff(channel); | |
316 | set_dma_mode(channel, mode); | |
317 | set_dma_addr(channel, buffer); | |
318 | set_dma_count(channel, count); | |
319 | enable_dma(channel); | |
320 | ||
321 | release_dma_lock(flags); | |
322 | } | |
323 | EXPORT_SYMBOL(irda_setup_dma); | |
56c3b7d7 | 324 | #endif |