Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / net / irda / irda_device.c
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, see <http://www.gnu.org/licenses/>.
27  *
28  ********************************************************************/
29
30 #include <linux/string.h>
31 #include <linux/proc_fs.h>
32 #include <linux/skbuff.h>
33 #include <linux/capability.h>
34 #include <linux/if.h>
35 #include <linux/if_ether.h>
36 #include <linux/if_arp.h>
37 #include <linux/netdevice.h>
38 #include <linux/init.h>
39 #include <linux/tty.h>
40 #include <linux/kmod.h>
41 #include <linux/spinlock.h>
42 #include <linux/slab.h>
43 #include <linux/export.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
55 static void __irda_task_delete(struct irda_task *task);
56
57 static hashbin_t *dongles = NULL;
58 static hashbin_t *tasks = NULL;
59
60 static void irda_task_timer_expired(void *data);
61
62 int __init irda_device_init( void)
63 {
64         dongles = hashbin_new(HB_NOLOCK);
65         if (dongles == NULL) {
66                 net_warn_ratelimited("IrDA: Can't allocate dongles hashbin!\n");
67                 return -ENOMEM;
68         }
69         spin_lock_init(&dongles->hb_spinlock);
70
71         tasks = hashbin_new(HB_LOCK);
72         if (tasks == NULL) {
73                 net_warn_ratelimited("IrDA: Can't allocate tasks hashbin!\n");
74                 hashbin_delete(dongles, NULL);
75                 return -ENOMEM;
76         }
77
78         /* We no longer initialise the driver ourselves here, we let
79          * the system do it for us... - Jean II */
80
81         return 0;
82 }
83
84 static void leftover_dongle(void *arg)
85 {
86         struct dongle_reg *reg = arg;
87         net_warn_ratelimited("IrDA: Dongle type %x not unregistered\n",
88                              reg->type);
89 }
90
91 void irda_device_cleanup(void)
92 {
93         hashbin_delete(tasks, (FREE_FUNC) __irda_task_delete);
94
95         hashbin_delete(dongles, leftover_dongle);
96 }
97
98 /*
99  * Function irda_device_set_media_busy (self, status)
100  *
101  *    Called when we have detected that another station is transmitting
102  *    in contention mode.
103  */
104 void irda_device_set_media_busy(struct net_device *dev, int status)
105 {
106         struct irlap_cb *self;
107
108         pr_debug("%s(%s)\n", __func__, status ? "TRUE" : "FALSE");
109
110         self = (struct irlap_cb *) dev->atalk_ptr;
111
112         /* Some drivers may enable the receive interrupt before calling
113          * irlap_open(), or they may disable the receive interrupt
114          * after calling irlap_close().
115          * The IrDA stack is protected from this in irlap_driver_rcv().
116          * However, the driver calls directly the wrapper, that calls
117          * us directly. Make sure we protect ourselves.
118          * Jean II */
119         if (!self || self->magic != LAP_MAGIC)
120                 return;
121
122         if (status) {
123                 self->media_busy = TRUE;
124                 if (status == SMALL)
125                         irlap_start_mbusy_timer(self, SMALLBUSY_TIMEOUT);
126                 else
127                         irlap_start_mbusy_timer(self, MEDIABUSY_TIMEOUT);
128                 pr_debug("Media busy!\n");
129         } else {
130                 self->media_busy = FALSE;
131                 irlap_stop_mbusy_timer(self);
132         }
133 }
134 EXPORT_SYMBOL(irda_device_set_media_busy);
135
136
137 /*
138  * Function irda_device_is_receiving (dev)
139  *
140  *    Check if the device driver is currently receiving data
141  *
142  */
143 int irda_device_is_receiving(struct net_device *dev)
144 {
145         struct if_irda_req req;
146         int ret;
147
148         if (!dev->netdev_ops->ndo_do_ioctl) {
149                 net_err_ratelimited("%s: do_ioctl not impl. by device driver\n",
150                                     __func__);
151                 return -1;
152         }
153
154         ret = (dev->netdev_ops->ndo_do_ioctl)(dev, (struct ifreq *) &req,
155                                               SIOCGRECEIVING);
156         if (ret < 0)
157                 return ret;
158
159         return req.ifr_receiving;
160 }
161
162 static void __irda_task_delete(struct irda_task *task)
163 {
164         del_timer(&task->timer);
165
166         kfree(task);
167 }
168
169 static void irda_task_delete(struct irda_task *task)
170 {
171         /* Unregister task */
172         hashbin_remove(tasks, (long) task, NULL);
173
174         __irda_task_delete(task);
175 }
176
177 /*
178  * Function irda_task_kick (task)
179  *
180  *    Tries to execute a task possible multiple times until the task is either
181  *    finished, or askes for a timeout. When a task is finished, we do post
182  *    processing, and notify the parent task, that is waiting for this task
183  *    to complete.
184  */
185 static int irda_task_kick(struct irda_task *task)
186 {
187         int finished = TRUE;
188         int count = 0;
189         int timeout;
190
191         IRDA_ASSERT(task != NULL, return -1;);
192         IRDA_ASSERT(task->magic == IRDA_TASK_MAGIC, return -1;);
193
194         /* Execute task until it's finished, or askes for a timeout */
195         do {
196                 timeout = task->function(task);
197                 if (count++ > 100) {
198                         net_err_ratelimited("%s: error in task handler!\n",
199                                             __func__);
200                         irda_task_delete(task);
201                         return TRUE;
202                 }
203         } while ((timeout == 0) && (task->state != IRDA_TASK_DONE));
204
205         if (timeout < 0) {
206                 net_err_ratelimited("%s: Error executing task!\n", __func__);
207                 irda_task_delete(task);
208                 return TRUE;
209         }
210
211         /* Check if we are finished */
212         if (task->state == IRDA_TASK_DONE) {
213                 del_timer(&task->timer);
214
215                 /* Do post processing */
216                 if (task->finished)
217                         task->finished(task);
218
219                 /* Notify parent */
220                 if (task->parent) {
221                         /* Check if parent is waiting for us to complete */
222                         if (task->parent->state == IRDA_TASK_CHILD_WAIT) {
223                                 task->parent->state = IRDA_TASK_CHILD_DONE;
224
225                                 /* Stop timer now that we are here */
226                                 del_timer(&task->parent->timer);
227
228                                 /* Kick parent task */
229                                 irda_task_kick(task->parent);
230                         }
231                 }
232                 irda_task_delete(task);
233         } else if (timeout > 0) {
234                 irda_start_timer(&task->timer, timeout, (void *) task,
235                                  irda_task_timer_expired);
236                 finished = FALSE;
237         } else {
238                 pr_debug("%s(), not finished, and no timeout!\n",
239                          __func__);
240                 finished = FALSE;
241         }
242
243         return finished;
244 }
245
246 /*
247  * Function irda_task_timer_expired (data)
248  *
249  *    Task time has expired. We now try to execute task (again), and restart
250  *    the timer if the task has not finished yet
251  */
252 static void irda_task_timer_expired(void *data)
253 {
254         struct irda_task *task;
255
256         task = data;
257
258         irda_task_kick(task);
259 }
260
261 /*
262  * Function irda_device_setup (dev)
263  *
264  *    This function should be used by low level device drivers in a similar way
265  *    as ether_setup() is used by normal network device drivers
266  */
267 static void irda_device_setup(struct net_device *dev)
268 {
269         dev->hard_header_len = 0;
270         dev->addr_len        = LAP_ALEN;
271
272         dev->type            = ARPHRD_IRDA;
273         dev->tx_queue_len    = 8; /* Window size + 1 s-frame */
274
275         memset(dev->broadcast, 0xff, LAP_ALEN);
276
277         dev->mtu = 2048;
278         dev->flags = IFF_NOARP;
279 }
280
281 /*
282  * Funciton  alloc_irdadev
283  *      Allocates and sets up an IRDA device in a manner similar to
284  *      alloc_etherdev.
285  */
286 struct net_device *alloc_irdadev(int sizeof_priv)
287 {
288         return alloc_netdev(sizeof_priv, "irda%d", NET_NAME_UNKNOWN,
289                             irda_device_setup);
290 }
291 EXPORT_SYMBOL(alloc_irdadev);
292
293 #ifdef CONFIG_ISA_DMA_API
294 /*
295  * Function setup_dma (idev, buffer, count, mode)
296  *
297  *    Setup the DMA channel. Commonly used by LPC FIR drivers
298  *
299  */
300 void irda_setup_dma(int channel, dma_addr_t buffer, int count, int mode)
301 {
302         unsigned long flags;
303
304         flags = claim_dma_lock();
305
306         disable_dma(channel);
307         clear_dma_ff(channel);
308         set_dma_mode(channel, mode);
309         set_dma_addr(channel, buffer);
310         set_dma_count(channel, count);
311         enable_dma(channel);
312
313         release_dma_lock(flags);
314 }
315 EXPORT_SYMBOL(irda_setup_dma);
316 #endif