aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/irda/sir_dev.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/irda/sir_dev.c')
-rw-r--r--drivers/net/irda/sir_dev.c315
1 files changed, 311 insertions, 4 deletions
diff --git a/drivers/net/irda/sir_dev.c b/drivers/net/irda/sir_dev.c
index ea7c9464d46a..3b5854d10c17 100644
--- a/drivers/net/irda/sir_dev.c
+++ b/drivers/net/irda/sir_dev.c
@@ -23,6 +23,298 @@
23 23
24#include "sir-dev.h" 24#include "sir-dev.h"
25 25
26
27static struct workqueue_struct *irda_sir_wq;
28
29/* STATE MACHINE */
30
31/* substate handler of the config-fsm to handle the cases where we want
32 * to wait for transmit completion before changing the port configuration
33 */
34
35static int sirdev_tx_complete_fsm(struct sir_dev *dev)
36{
37 struct sir_fsm *fsm = &dev->fsm;
38 unsigned next_state, delay;
39 unsigned bytes_left;
40
41 do {
42 next_state = fsm->substate; /* default: stay in current substate */
43 delay = 0;
44
45 switch(fsm->substate) {
46
47 case SIRDEV_STATE_WAIT_XMIT:
48 if (dev->drv->chars_in_buffer)
49 bytes_left = dev->drv->chars_in_buffer(dev);
50 else
51 bytes_left = 0;
52 if (!bytes_left) {
53 next_state = SIRDEV_STATE_WAIT_UNTIL_SENT;
54 break;
55 }
56
57 if (dev->speed > 115200)
58 delay = (bytes_left*8*10000) / (dev->speed/100);
59 else if (dev->speed > 0)
60 delay = (bytes_left*10*10000) / (dev->speed/100);
61 else
62 delay = 0;
63 /* expected delay (usec) until remaining bytes are sent */
64 if (delay < 100) {
65 udelay(delay);
66 delay = 0;
67 break;
68 }
69 /* sleep some longer delay (msec) */
70 delay = (delay+999) / 1000;
71 break;
72
73 case SIRDEV_STATE_WAIT_UNTIL_SENT:
74 /* block until underlaying hardware buffer are empty */
75 if (dev->drv->wait_until_sent)
76 dev->drv->wait_until_sent(dev);
77 next_state = SIRDEV_STATE_TX_DONE;
78 break;
79
80 case SIRDEV_STATE_TX_DONE:
81 return 0;
82
83 default:
84 IRDA_ERROR("%s - undefined state\n", __FUNCTION__);
85 return -EINVAL;
86 }
87 fsm->substate = next_state;
88 } while (delay == 0);
89 return delay;
90}
91
92/*
93 * Function sirdev_config_fsm
94 *
95 * State machine to handle the configuration of the device (and attached dongle, if any).
96 * This handler is scheduled for execution in kIrDAd context, so we can sleep.
97 * however, kIrDAd is shared by all sir_dev devices so we better don't sleep there too
98 * long. Instead, for longer delays we start a timer to reschedule us later.
99 * On entry, fsm->sem is always locked and the netdev xmit queue stopped.
100 * Both must be unlocked/restarted on completion - but only on final exit.
101 */
102
103static void sirdev_config_fsm(void *data)
104{
105 struct sir_dev *dev = data;
106 struct sir_fsm *fsm = &dev->fsm;
107 int next_state;
108 int ret = -1;
109 unsigned delay;
110
111 IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__, jiffies);
112
113 do {
114 IRDA_DEBUG(3, "%s - state=0x%04x / substate=0x%04x\n",
115 __FUNCTION__, fsm->state, fsm->substate);
116
117 next_state = fsm->state;
118 delay = 0;
119
120 switch(fsm->state) {
121
122 case SIRDEV_STATE_DONGLE_OPEN:
123 if (dev->dongle_drv != NULL) {
124 ret = sirdev_put_dongle(dev);
125 if (ret) {
126 fsm->result = -EINVAL;
127 next_state = SIRDEV_STATE_ERROR;
128 break;
129 }
130 }
131
132 /* Initialize dongle */
133 ret = sirdev_get_dongle(dev, fsm->param);
134 if (ret) {
135 fsm->result = ret;
136 next_state = SIRDEV_STATE_ERROR;
137 break;
138 }
139
140 /* Dongles are powered through the modem control lines which
141 * were just set during open. Before resetting, let's wait for
142 * the power to stabilize. This is what some dongle drivers did
143 * in open before, while others didn't - should be safe anyway.
144 */
145
146 delay = 50;
147 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
148 next_state = SIRDEV_STATE_DONGLE_RESET;
149
150 fsm->param = 9600;
151
152 break;
153
154 case SIRDEV_STATE_DONGLE_CLOSE:
155 /* shouldn't we just treat this as success=? */
156 if (dev->dongle_drv == NULL) {
157 fsm->result = -EINVAL;
158 next_state = SIRDEV_STATE_ERROR;
159 break;
160 }
161
162 ret = sirdev_put_dongle(dev);
163 if (ret) {
164 fsm->result = ret;
165 next_state = SIRDEV_STATE_ERROR;
166 break;
167 }
168 next_state = SIRDEV_STATE_DONE;
169 break;
170
171 case SIRDEV_STATE_SET_DTR_RTS:
172 ret = sirdev_set_dtr_rts(dev,
173 (fsm->param&0x02) ? TRUE : FALSE,
174 (fsm->param&0x01) ? TRUE : FALSE);
175 next_state = SIRDEV_STATE_DONE;
176 break;
177
178 case SIRDEV_STATE_SET_SPEED:
179 fsm->substate = SIRDEV_STATE_WAIT_XMIT;
180 next_state = SIRDEV_STATE_DONGLE_CHECK;
181 break;
182
183 case SIRDEV_STATE_DONGLE_CHECK:
184 ret = sirdev_tx_complete_fsm(dev);
185 if (ret < 0) {
186 fsm->result = ret;
187 next_state = SIRDEV_STATE_ERROR;
188 break;
189 }
190 if ((delay=ret) != 0)
191 break;
192
193 if (dev->dongle_drv) {
194 fsm->substate = SIRDEV_STATE_DONGLE_RESET;
195 next_state = SIRDEV_STATE_DONGLE_RESET;
196 }
197 else {
198 dev->speed = fsm->param;
199 next_state = SIRDEV_STATE_PORT_SPEED;
200 }
201 break;
202
203 case SIRDEV_STATE_DONGLE_RESET:
204 if (dev->dongle_drv->reset) {
205 ret = dev->dongle_drv->reset(dev);
206 if (ret < 0) {
207 fsm->result = ret;
208 next_state = SIRDEV_STATE_ERROR;
209 break;
210 }
211 }
212 else
213 ret = 0;
214 if ((delay=ret) == 0) {
215 /* set serial port according to dongle default speed */
216 if (dev->drv->set_speed)
217 dev->drv->set_speed(dev, dev->speed);
218 fsm->substate = SIRDEV_STATE_DONGLE_SPEED;
219 next_state = SIRDEV_STATE_DONGLE_SPEED;
220 }
221 break;
222
223 case SIRDEV_STATE_DONGLE_SPEED:
224 if (dev->dongle_drv->reset) {
225 ret = dev->dongle_drv->set_speed(dev, fsm->param);
226 if (ret < 0) {
227 fsm->result = ret;
228 next_state = SIRDEV_STATE_ERROR;
229 break;
230 }
231 }
232 else
233 ret = 0;
234 if ((delay=ret) == 0)
235 next_state = SIRDEV_STATE_PORT_SPEED;
236 break;
237
238 case SIRDEV_STATE_PORT_SPEED:
239 /* Finally we are ready to change the serial port speed */
240 if (dev->drv->set_speed)
241 dev->drv->set_speed(dev, dev->speed);
242 dev->new_speed = 0;
243 next_state = SIRDEV_STATE_DONE;
244 break;
245
246 case SIRDEV_STATE_DONE:
247 /* Signal network layer so it can send more frames */
248 netif_wake_queue(dev->netdev);
249 next_state = SIRDEV_STATE_COMPLETE;
250 break;
251
252 default:
253 IRDA_ERROR("%s - undefined state\n", __FUNCTION__);
254 fsm->result = -EINVAL;
255 /* fall thru */
256
257 case SIRDEV_STATE_ERROR:
258 IRDA_ERROR("%s - error: %d\n", __FUNCTION__, fsm->result);
259
260#if 0 /* don't enable this before we have netdev->tx_timeout to recover */
261 netif_stop_queue(dev->netdev);
262#else
263 netif_wake_queue(dev->netdev);
264#endif
265 /* fall thru */
266
267 case SIRDEV_STATE_COMPLETE:
268 /* config change finished, so we are not busy any longer */
269 sirdev_enable_rx(dev);
270 up(&fsm->sem);
271 return;
272 }
273 fsm->state = next_state;
274 } while(!delay);
275
276 queue_delayed_work(irda_sir_wq, &fsm->work, msecs_to_jiffies(delay));
277}
278
279/* schedule some device configuration task for execution by kIrDAd
280 * on behalf of the above state machine.
281 * can be called from process or interrupt/tasklet context.
282 */
283
284int sirdev_schedule_request(struct sir_dev *dev, int initial_state, unsigned param)
285{
286 struct sir_fsm *fsm = &dev->fsm;
287
288 IRDA_DEBUG(2, "%s - state=0x%04x / param=%u\n", __FUNCTION__, initial_state, param);
289
290 if (down_trylock(&fsm->sem)) {
291 if (in_interrupt() || in_atomic() || irqs_disabled()) {
292 IRDA_DEBUG(1, "%s(), state machine busy!\n", __FUNCTION__);
293 return -EWOULDBLOCK;
294 } else
295 down(&fsm->sem);
296 }
297
298 if (fsm->state == SIRDEV_STATE_DEAD) {
299 /* race with sirdev_close should never happen */
300 IRDA_ERROR("%s(), instance staled!\n", __FUNCTION__);
301 up(&fsm->sem);
302 return -ESTALE; /* or better EPIPE? */
303 }
304
305 netif_stop_queue(dev->netdev);
306 atomic_set(&dev->enable_rx, 0);
307
308 fsm->state = initial_state;
309 fsm->param = param;
310 fsm->result = 0;
311
312 INIT_WORK(&fsm->work, sirdev_config_fsm, dev);
313 queue_work(irda_sir_wq, &fsm->work);
314 return 0;
315}
316
317
26/***************************************************************************/ 318/***************************************************************************/
27 319
28void sirdev_enable_rx(struct sir_dev *dev) 320void sirdev_enable_rx(struct sir_dev *dev)
@@ -619,10 +911,6 @@ struct sir_dev * sirdev_get_instance(const struct sir_driver *drv, const char *n
619 spin_lock_init(&dev->tx_lock); 911 spin_lock_init(&dev->tx_lock);
620 init_MUTEX(&dev->fsm.sem); 912 init_MUTEX(&dev->fsm.sem);
621 913
622 INIT_LIST_HEAD(&dev->fsm.rq.lh_request);
623 dev->fsm.rq.pending = 0;
624 init_timer(&dev->fsm.rq.timer);
625
626 dev->drv = drv; 914 dev->drv = drv;
627 dev->netdev = ndev; 915 dev->netdev = ndev;
628 916
@@ -682,3 +970,22 @@ int sirdev_put_instance(struct sir_dev *dev)
682} 970}
683EXPORT_SYMBOL(sirdev_put_instance); 971EXPORT_SYMBOL(sirdev_put_instance);
684 972
973static int __init sir_wq_init(void)
974{
975 irda_sir_wq = create_singlethread_workqueue("irda_sir_wq");
976 if (!irda_sir_wq)
977 return -ENOMEM;
978 return 0;
979}
980
981static void __exit sir_wq_exit(void)
982{
983 destroy_workqueue(irda_sir_wq);
984}
985
986module_init(sir_wq_init);
987module_exit(sir_wq_exit);
988
989MODULE_AUTHOR("Martin Diehl <info@mdiehl.de>");
990MODULE_DESCRIPTION("IrDA SIR core");
991MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-24 07:34:53 -0500