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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/string.h> |
33 | #include <linux/proc_fs.h> |
34 | #include <linux/skbuff.h> |
35 | #include <linux/capability.h> |
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> |
44 | #include <linux/slab.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 | 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 | |
85 | static void leftover_dongle(void *arg) |
86 | { |
87 | struct dongle_reg *reg = arg; |
88 | IRDA_WARNING("IrDA: Dongle type %x not unregistered\n", |
89 | reg->type); |
90 | } |
91 | |
92 | void irda_device_cleanup(void) |
93 | { |
94 | IRDA_DEBUG(4, "%s()\n", __func__); |
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 | |
111 | IRDA_DEBUG(4, "%s(%s)\n", __func__, status ? "TRUE" : "FALSE"); |
112 | |
113 | self = (struct irlap_cb *) dev->atalk_ptr; |
114 | |
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; |
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 | |
151 | IRDA_DEBUG(2, "%s()\n", __func__); |
152 | |
153 | if (!dev->netdev_ops->ndo_do_ioctl) { |
154 | IRDA_ERROR("%s: do_ioctl not impl. by device driver\n", |
155 | __func__); |
156 | return -1; |
157 | } |
158 | |
159 | ret = (dev->netdev_ops->ndo_do_ioctl)(dev, (struct ifreq *) &req, |
160 | SIOCGRECEIVING); |
161 | if (ret < 0) |
162 | return ret; |
163 | |
164 | return req.ifr_receiving; |
165 | } |
166 | |
167 | static void __irda_task_delete(struct irda_task *task) |
168 | { |
169 | del_timer(&task->timer); |
170 | |
171 | kfree(task); |
172 | } |
173 | |
174 | static void irda_task_delete(struct irda_task *task) |
175 | { |
176 | /* Unregister task */ |
177 | hashbin_remove(tasks, (long) task, NULL); |
178 | |
179 | __irda_task_delete(task); |
180 | } |
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 | |
196 | IRDA_DEBUG(2, "%s()\n", __func__); |
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", |
206 | __func__); |
207 | irda_task_delete(task); |
208 | return TRUE; |
209 | } |
210 | } while ((timeout == 0) && (task->state != IRDA_TASK_DONE)); |
211 | |
212 | if (timeout < 0) { |
213 | IRDA_ERROR("%s: Error executing task!\n", __func__); |
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", |
246 | __func__); |
247 | finished = FALSE; |
248 | } |
249 | |
250 | return finished; |
251 | } |
252 | |
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 | |
263 | IRDA_DEBUG(2, "%s()\n", __func__); |
264 | |
265 | task = (struct irda_task *) data; |
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 | { |
278 | dev->hard_header_len = 0; |
279 | dev->addr_len = LAP_ALEN; |
280 | |
281 | dev->type = ARPHRD_IRDA; |
282 | dev->tx_queue_len = 8; /* Window size + 1 s-frame */ |
283 | |
284 | memset(dev->broadcast, 0xff, LAP_ALEN); |
285 | |
286 | dev->mtu = 2048; |
287 | dev->flags = IFF_NOARP; |
288 | } |
289 | |
290 | /* |
291 | * Funciton alloc_irdadev |
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 | |
301 | #ifdef CONFIG_ISA_DMA_API |
302 | /* |
303 | * Function setup_dma (idev, buffer, count, mode) |
304 | * |
305 | * Setup the DMA channel. Commonly used by LPC FIR drivers |
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); |
324 | #endif |
325 |
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