1 /*********************************************************************
5 * Description: Half duplex serial port SIR driver for IrDA.
6 * Status: Experimental.
7 * Author: Dag Brattli <dagb@cs.uit.no>
8 * Created at: Sun Aug 3 13:49:59 1997
9 * Modified at: Fri Jan 28 20:22:38 2000
10 * Modified by: Dag Brattli <dagb@cs.uit.no>
11 * Sources: serial.c by Linus Torvalds
13 * Copyright (c) 1997, 1998, 1999-2000 Dag Brattli, All Rights Reserved.
14 * Copyright (c) 2000-2003 Jean Tourrilhes, All Rights Reserved.
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
31 * This driver is ment to be a small half duplex serial driver to be
32 * used for IR-chipsets that has a UART (16550) compatibility mode.
33 * Eventually it will replace irtty, because of irtty has some
34 * problems that is hard to get around when we don't have control
35 * over the serial driver. This driver may also be used by FIR
36 * drivers to handle SIR mode for them.
38 ********************************************************************/
40 #include <linux/module.h>
42 #include <linux/kernel.h>
43 #include <linux/types.h>
44 #include <linux/ioport.h>
45 #include <linux/slab.h>
46 #include <linux/string.h>
47 #include <linux/skbuff.h>
48 #include <linux/serial_reg.h>
49 #include <linux/errno.h>
50 #include <linux/init.h>
51 #include <linux/spinlock.h>
52 #include <linux/delay.h>
53 #include <linux/rtnetlink.h>
55 #include <asm/system.h>
56 #include <asm/bitops.h>
59 #include <net/irda/irda.h>
60 #include <net/irda/wrapper.h>
66 * Currently you'll need to set these values using insmod like this:
67 * insmod irport io=0x3e8 irq=11
69 static unsigned int io
[] = { ~0, ~0, ~0, ~0 };
70 static unsigned int irq
[] = { 0, 0, 0, 0 };
72 static unsigned int qos_mtt_bits
= 0x03;
74 static struct irport_cb
*dev_self
[] = { NULL
, NULL
, NULL
, NULL
};
75 static char *driver_name
= "irport";
77 static inline void irport_write_wakeup(struct irport_cb
*self
);
78 static inline int irport_write(int iobase
, int fifo_size
, __u8
*buf
, int len
);
79 static inline void irport_receive(struct irport_cb
*self
);
81 static int irport_net_ioctl(struct net_device
*dev
, struct ifreq
*rq
,
83 static inline int irport_is_receiving(struct irport_cb
*self
);
84 static int irport_set_dtr_rts(struct net_device
*dev
, int dtr
, int rts
);
85 static int irport_raw_write(struct net_device
*dev
, __u8
*buf
, int len
);
86 static struct net_device_stats
*irport_net_get_stats(struct net_device
*dev
);
87 static int irport_change_speed_complete(struct irda_task
*task
);
88 static void irport_timeout(struct net_device
*dev
);
90 EXPORT_SYMBOL(irport_open
);
91 EXPORT_SYMBOL(irport_close
);
92 EXPORT_SYMBOL(irport_start
);
93 EXPORT_SYMBOL(irport_stop
);
94 EXPORT_SYMBOL(irport_interrupt
);
95 EXPORT_SYMBOL(irport_hard_xmit
);
96 EXPORT_SYMBOL(irport_timeout
);
97 EXPORT_SYMBOL(irport_change_speed
);
98 EXPORT_SYMBOL(irport_net_open
);
99 EXPORT_SYMBOL(irport_net_close
);
101 static int __init
irport_init(void)
105 for (i
=0; (io
[i
] < 2000) && (i
< 4); i
++) {
106 if (irport_open(i
, io
[i
], irq
[i
]) != NULL
)
110 * Maybe something failed, but we can still be usable for FIR drivers
116 * Function irport_cleanup ()
118 * Close all configured ports
121 static void __exit
irport_cleanup(void)
125 IRDA_DEBUG( 4, "%s()\n", __FUNCTION__
);
127 for (i
=0; i
< 4; i
++) {
129 irport_close(dev_self
[i
]);
134 irport_open(int i
, unsigned int iobase
, unsigned int irq
)
136 struct net_device
*dev
;
137 struct irport_cb
*self
;
139 IRDA_DEBUG(1, "%s()\n", __FUNCTION__
);
141 /* Lock the port that we need */
142 if (!request_region(iobase
, IO_EXTENT
, driver_name
)) {
143 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
144 __FUNCTION__
, iobase
);
149 * Allocate new instance of the driver
151 dev
= alloc_irdadev(sizeof(struct irport_cb
));
153 ERROR("%s(), can't allocate memory for "
154 "irda device!\n", __FUNCTION__
);
159 spin_lock_init(&self
->lock
);
161 /* Need to store self somewhere */
167 self
->io
.sir_base
= iobase
;
168 self
->io
.sir_ext
= IO_EXTENT
;
170 self
->io
.fifo_size
= 16; /* 16550A and compatible */
172 /* Initialize QoS for this device */
173 irda_init_max_qos_capabilies(&self
->qos
);
175 self
->qos
.baud_rate
.bits
= IR_9600
|IR_19200
|IR_38400
|IR_57600
|
178 self
->qos
.min_turn_time
.bits
= qos_mtt_bits
;
179 irda_qos_bits_to_value(&self
->qos
);
181 /* Bootstrap ZeroCopy Rx */
182 self
->rx_buff
.truesize
= IRDA_SKB_MAX_MTU
;
183 self
->rx_buff
.skb
= __dev_alloc_skb(self
->rx_buff
.truesize
,
185 if (self
->rx_buff
.skb
== NULL
) {
186 ERROR("%s(), can't allocate memory for "
187 "receive buffer!\n", __FUNCTION__
);
190 skb_reserve(self
->rx_buff
.skb
, 1);
191 self
->rx_buff
.head
= self
->rx_buff
.skb
->data
;
192 /* No need to memset the buffer, unless you are really pedantic */
194 /* Finish setup the Rx buffer descriptor */
195 self
->rx_buff
.in_frame
= FALSE
;
196 self
->rx_buff
.state
= OUTSIDE_FRAME
;
197 self
->rx_buff
.data
= self
->rx_buff
.head
;
199 /* Specify how much memory we want */
200 self
->tx_buff
.truesize
= 4000;
202 /* Allocate memory if needed */
203 if (self
->tx_buff
.truesize
> 0) {
204 self
->tx_buff
.head
= (__u8
*) kmalloc(self
->tx_buff
.truesize
,
206 if (self
->tx_buff
.head
== NULL
) {
207 ERROR("%s(), can't allocate memory for "
208 "transmit buffer!\n", __FUNCTION__
);
211 memset(self
->tx_buff
.head
, 0, self
->tx_buff
.truesize
);
213 self
->tx_buff
.data
= self
->tx_buff
.head
;
216 /* Keep track of module usage */
217 SET_MODULE_OWNER(dev
);
219 /* May be overridden by piggyback drivers */
220 self
->interrupt
= irport_interrupt
;
221 self
->change_speed
= irport_change_speed
;
223 /* Override the network functions we need to use */
224 dev
->hard_start_xmit
= irport_hard_xmit
;
225 dev
->tx_timeout
= irport_timeout
;
226 dev
->watchdog_timeo
= HZ
; /* Allow time enough for speed change */
227 dev
->open
= irport_net_open
;
228 dev
->stop
= irport_net_close
;
229 dev
->get_stats
= irport_net_get_stats
;
230 dev
->do_ioctl
= irport_net_ioctl
;
232 /* Make ifconfig display some details */
233 dev
->base_addr
= iobase
;
236 if (register_netdev(dev
)) {
237 ERROR("%s(), register_netdev() failed!\n", __FUNCTION__
);
240 MESSAGE("IrDA: Registered device %s (irport io=0x%X irq=%d)\n",
241 dev
->name
, iobase
, irq
);
245 kfree(self
->tx_buff
.head
);
247 kfree_skb(self
->rx_buff
.skb
);
252 release_region(iobase
, IO_EXTENT
);
257 int irport_close(struct irport_cb
*self
)
259 ASSERT(self
!= NULL
, return -1;);
261 /* We are not using any dongle anymore! */
263 irda_device_dongle_cleanup(self
->dongle
);
266 /* Remove netdevice */
267 unregister_netdev(self
->netdev
);
269 /* Release the IO-port that this driver is using */
270 IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
271 __FUNCTION__
, self
->io
.sir_base
);
272 release_region(self
->io
.sir_base
, self
->io
.sir_ext
);
274 if (self
->tx_buff
.head
)
275 kfree(self
->tx_buff
.head
);
277 if (self
->rx_buff
.skb
)
278 kfree_skb(self
->rx_buff
.skb
);
279 self
->rx_buff
.skb
= NULL
;
281 /* Remove ourselves */
282 dev_self
[self
->index
] = NULL
;
283 free_netdev(self
->netdev
);
288 void irport_start(struct irport_cb
*self
)
292 iobase
= self
->io
.sir_base
;
296 /* We can't lock, we may be called from a FIR driver - Jean II */
298 /* Initialize UART */
299 outb(UART_LCR_WLEN8
, iobase
+UART_LCR
); /* Reset DLAB */
300 outb((UART_MCR_DTR
| UART_MCR_RTS
| UART_MCR_OUT2
), iobase
+UART_MCR
);
302 /* Turn on interrups */
303 outb(UART_IER_RLSI
| UART_IER_RDI
|UART_IER_THRI
, iobase
+UART_IER
);
306 void irport_stop(struct irport_cb
*self
)
310 iobase
= self
->io
.sir_base
;
312 /* We can't lock, we may be called from a FIR driver - Jean II */
314 /* We are not transmitting any more */
315 self
->transmitting
= 0;
318 outb(0, iobase
+UART_MCR
);
320 /* Turn off interrupts */
321 outb(0, iobase
+UART_IER
);
325 * Function irport_probe (void)
330 int irport_probe(int iobase
)
332 IRDA_DEBUG(4, "%s(), iobase=%#x\n", __FUNCTION__
, iobase
);
338 * Function irport_get_fcr (speed)
340 * Compute value of fcr
343 static inline unsigned int irport_get_fcr(__u32 speed
)
345 unsigned int fcr
; /* FIFO control reg */
348 fcr
= UART_FCR_ENABLE_FIFO
;
351 * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
352 * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
353 * about this timeout since it will always be fast enough.
356 fcr
|= UART_FCR_TRIGGER_1
;
358 //fcr |= UART_FCR_TRIGGER_14;
359 fcr
|= UART_FCR_TRIGGER_8
;
365 * Function irport_change_speed (self, speed)
367 * Set speed of IrDA port to specified baudrate
369 * This function should be called with irq off and spin-lock.
371 void irport_change_speed(void *priv
, __u32 speed
)
373 struct irport_cb
*self
= (struct irport_cb
*) priv
;
375 unsigned int fcr
; /* FIFO control reg */
376 unsigned int lcr
; /* Line control reg */
379 ASSERT(self
!= NULL
, return;);
380 ASSERT(speed
!= 0, return;);
382 IRDA_DEBUG(1, "%s(), Setting speed to: %d - iobase=%#x\n",
383 __FUNCTION__
, speed
, self
->io
.sir_base
);
385 /* We can't lock, we may be called from a FIR driver - Jean II */
387 iobase
= self
->io
.sir_base
;
389 /* Update accounting for new speed */
390 self
->io
.speed
= speed
;
392 /* Turn off interrupts */
393 outb(0, iobase
+UART_IER
);
395 divisor
= SPEED_MAX
/speed
;
397 /* Get proper fifo configuration */
398 fcr
= irport_get_fcr(speed
);
400 /* IrDA ports use 8N1 */
401 lcr
= UART_LCR_WLEN8
;
403 outb(UART_LCR_DLAB
| lcr
, iobase
+UART_LCR
); /* Set DLAB */
404 outb(divisor
& 0xff, iobase
+UART_DLL
); /* Set speed */
405 outb(divisor
>> 8, iobase
+UART_DLM
);
406 outb(lcr
, iobase
+UART_LCR
); /* Set 8N1 */
407 outb(fcr
, iobase
+UART_FCR
); /* Enable FIFO's */
409 /* Turn on interrups */
410 /* This will generate a fatal interrupt storm.
411 * People calling us will do that properly - Jean II */
412 //outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
416 * Function __irport_change_speed (instance, state, param)
418 * State machine for changing speed of the device. We do it this way since
419 * we cannot use schedule_timeout() when we are in interrupt context
422 int __irport_change_speed(struct irda_task
*task
)
424 struct irport_cb
*self
;
425 __u32 speed
= (__u32
) task
->param
;
426 unsigned long flags
= 0;
430 IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__
, jiffies
);
432 self
= (struct irport_cb
*) task
->instance
;
434 ASSERT(self
!= NULL
, return -1;);
436 /* Locking notes : this function may be called from irq context with
437 * spinlock, via irport_write_wakeup(), or from non-interrupt without
438 * spinlock (from the task timer). Yuck !
439 * This is ugly, and unsafe is the spinlock is not already aquired.
440 * This will be fixed when irda-task get rewritten.
442 if (!spin_is_locked(&self
->lock
)) {
443 spin_lock_irqsave(&self
->lock
, flags
);
447 switch (task
->state
) {
450 /* Are we ready to change speed yet? */
451 if (self
->tx_buff
.len
> 0) {
452 task
->state
= IRDA_TASK_WAIT
;
454 /* Try again later */
455 ret
= msecs_to_jiffies(20);
460 irda_task_next_state(task
, IRDA_TASK_CHILD_INIT
);
462 irda_task_next_state(task
, IRDA_TASK_CHILD_DONE
);
464 case IRDA_TASK_CHILD_INIT
:
465 /* Go to default speed */
466 self
->change_speed(self
->priv
, 9600);
468 /* Change speed of dongle */
469 if (irda_task_execute(self
->dongle
,
470 self
->dongle
->issue
->change_speed
,
471 NULL
, task
, (void *) speed
))
473 /* Dongle need more time to change its speed */
474 irda_task_next_state(task
, IRDA_TASK_CHILD_WAIT
);
476 /* Give dongle 1 sec to finish */
477 ret
= msecs_to_jiffies(1000);
479 /* Child finished immediately */
480 irda_task_next_state(task
, IRDA_TASK_CHILD_DONE
);
482 case IRDA_TASK_CHILD_WAIT
:
483 WARNING("%s(), changing speed of dongle timed out!\n", __FUNCTION__
);
486 case IRDA_TASK_CHILD_DONE
:
487 /* Finally we are ready to change the speed */
488 self
->change_speed(self
->priv
, speed
);
490 irda_task_next_state(task
, IRDA_TASK_DONE
);
493 ERROR("%s(), unknown state %d\n", __FUNCTION__
, task
->state
);
494 irda_task_next_state(task
, IRDA_TASK_DONE
);
498 /* Put stuff in the state we found them - Jean II */
500 spin_unlock_irqrestore(&self
->lock
, flags
);
507 * Function irport_change_speed_complete (task)
509 * Called when the change speed operation completes
512 static int irport_change_speed_complete(struct irda_task
*task
)
514 struct irport_cb
*self
;
516 IRDA_DEBUG(1, "%s()\n", __FUNCTION__
);
518 self
= (struct irport_cb
*) task
->instance
;
520 ASSERT(self
!= NULL
, return -1;);
521 ASSERT(self
->netdev
!= NULL
, return -1;);
523 /* Finished changing speed, so we are not busy any longer */
524 /* Signal network layer so it can try to send the frame */
526 netif_wake_queue(self
->netdev
);
532 * Function irport_timeout (struct net_device *dev)
534 * The networking layer thinks we timed out.
538 static void irport_timeout(struct net_device
*dev
)
540 struct irport_cb
*self
;
545 self
= (struct irport_cb
*) dev
->priv
;
546 ASSERT(self
!= NULL
, return;);
547 iobase
= self
->io
.sir_base
;
549 WARNING("%s: transmit timed out, jiffies = %ld, trans_start = %ld\n",
550 dev
->name
, jiffies
, dev
->trans_start
);
551 spin_lock_irqsave(&self
->lock
, flags
);
553 /* Debug what's happening... */
555 /* Get interrupt status */
556 lsr
= inb(iobase
+UART_LSR
);
557 /* Read interrupt register */
558 iir
= inb(iobase
+UART_IIR
);
559 IRDA_DEBUG(0, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
560 __FUNCTION__
, iir
, lsr
, iobase
);
562 IRDA_DEBUG(0, "%s(), transmitting=%d, remain=%d, done=%d\n",
563 __FUNCTION__
, self
->transmitting
, self
->tx_buff
.len
,
564 self
->tx_buff
.data
- self
->tx_buff
.head
);
566 /* Now, restart the port */
568 self
->change_speed(self
->priv
, self
->io
.speed
);
569 /* This will re-enable irqs */
570 outb(/*UART_IER_RLSI|*/UART_IER_RDI
/*|UART_IER_THRI*/, iobase
+UART_IER
);
571 dev
->trans_start
= jiffies
;
572 spin_unlock_irqrestore(&self
->lock
, flags
);
574 netif_wake_queue(dev
);
578 * Function irport_wait_hw_transmitter_finish ()
580 * Wait for the real end of HW transmission
582 * The UART is a strict FIFO, and we get called only when we have finished
583 * pushing data to the FIFO, so the maximum amount of time we must wait
584 * is only for the FIFO to drain out.
586 * We use a simple calibrated loop. We may need to adjust the loop
587 * delay (udelay) to balance I/O traffic and latency. And we also need to
588 * adjust the maximum timeout.
589 * It would probably be better to wait for the proper interrupt,
590 * but it doesn't seem to be available.
592 * We can't use jiffies or kernel timers because :
593 * 1) We are called from the interrupt handler, which disable softirqs,
594 * so jiffies won't be increased
595 * 2) Jiffies granularity is usually very coarse (10ms), and we don't
596 * want to wait that long to detect stuck hardware.
600 static void irport_wait_hw_transmitter_finish(struct irport_cb
*self
)
603 int count
= 1000; /* 1 ms */
605 iobase
= self
->io
.sir_base
;
607 /* Calibrated busy loop */
608 while((count
-- > 0) && !(inb(iobase
+UART_LSR
) & UART_LSR_TEMT
))
612 IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__
);
616 * Function irport_hard_start_xmit (struct sk_buff *skb, struct net_device *dev)
618 * Transmits the current frame until FIFO is full, then
619 * waits until the next transmitt interrupt, and continues until the
620 * frame is transmitted.
622 int irport_hard_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
624 struct irport_cb
*self
;
629 IRDA_DEBUG(1, "%s()\n", __FUNCTION__
);
631 ASSERT(dev
!= NULL
, return 0;);
633 self
= (struct irport_cb
*) dev
->priv
;
634 ASSERT(self
!= NULL
, return 0;);
636 iobase
= self
->io
.sir_base
;
638 netif_stop_queue(dev
);
640 /* Make sure tests & speed change are atomic */
641 spin_lock_irqsave(&self
->lock
, flags
);
643 /* Check if we need to change the speed */
644 speed
= irda_get_next_speed(skb
);
645 if ((speed
!= self
->io
.speed
) && (speed
!= -1)) {
646 /* Check for empty frame */
649 * We send frames one by one in SIR mode (no
650 * pipelining), so at this point, if we were sending
651 * a previous frame, we just received the interrupt
652 * telling us it is finished (UART_IIR_THRI).
653 * Therefore, waiting for the transmitter to really
654 * finish draining the fifo won't take too long.
655 * And the interrupt handler is not expected to run.
657 irport_wait_hw_transmitter_finish(self
);
658 /* Better go there already locked - Jean II */
659 irda_task_execute(self
, __irport_change_speed
,
660 irport_change_speed_complete
,
661 NULL
, (void *) speed
);
662 dev
->trans_start
= jiffies
;
663 spin_unlock_irqrestore(&self
->lock
, flags
);
667 self
->new_speed
= speed
;
671 self
->tx_buff
.data
= self
->tx_buff
.head
;
673 /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
674 self
->tx_buff
.len
= async_wrap_skb(skb
, self
->tx_buff
.data
,
675 self
->tx_buff
.truesize
);
677 self
->stats
.tx_bytes
+= self
->tx_buff
.len
;
679 /* We are transmitting */
680 self
->transmitting
= 1;
682 /* Turn on transmit finished interrupt. Will fire immediately! */
683 outb(UART_IER_THRI
, iobase
+UART_IER
);
685 dev
->trans_start
= jiffies
;
686 spin_unlock_irqrestore(&self
->lock
, flags
);
694 * Function irport_write (driver)
696 * Fill Tx FIFO with transmit data
698 * Called only from irport_write_wakeup()
700 static inline int irport_write(int iobase
, int fifo_size
, __u8
*buf
, int len
)
704 /* Fill FIFO with current frame */
705 while ((actual
< fifo_size
) && (actual
< len
)) {
706 /* Transmit next byte */
707 outb(buf
[actual
], iobase
+UART_TX
);
716 * Function irport_write_wakeup (tty)
718 * Called by the driver when there's room for more data. If we have
719 * more packets to send, we send them here.
721 * Called only from irport_interrupt()
722 * Make sure this function is *not* called while we are receiving,
723 * otherwise we will reset fifo and loose data :-(
725 static inline void irport_write_wakeup(struct irport_cb
*self
)
731 ASSERT(self
!= NULL
, return;);
733 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
735 iobase
= self
->io
.sir_base
;
737 /* Finished with frame? */
738 if (self
->tx_buff
.len
> 0) {
739 /* Write data left in transmit buffer */
740 actual
= irport_write(iobase
, self
->io
.fifo_size
,
741 self
->tx_buff
.data
, self
->tx_buff
.len
);
742 self
->tx_buff
.data
+= actual
;
743 self
->tx_buff
.len
-= actual
;
746 * Now serial buffer is almost free & we can start
747 * transmission of another packet. But first we must check
748 * if we need to change the speed of the hardware
750 if (self
->new_speed
) {
751 irport_wait_hw_transmitter_finish(self
);
752 irda_task_execute(self
, __irport_change_speed
,
753 irport_change_speed_complete
,
754 NULL
, (void *) self
->new_speed
);
757 /* Tell network layer that we want more frames */
758 netif_wake_queue(self
->netdev
);
760 self
->stats
.tx_packets
++;
763 * Reset Rx FIFO to make sure that all reflected transmit data
764 * is discarded. This is needed for half duplex operation
766 fcr
= irport_get_fcr(self
->io
.speed
);
767 fcr
|= UART_FCR_CLEAR_RCVR
;
768 outb(fcr
, iobase
+UART_FCR
);
770 /* Finished transmitting */
771 self
->transmitting
= 0;
773 /* Turn on receive interrupts */
774 outb(UART_IER_RDI
, iobase
+UART_IER
);
776 IRDA_DEBUG(1, "%s() : finished Tx\n", __FUNCTION__
);
781 * Function irport_receive (self)
783 * Receive one frame from the infrared port
785 * Called only from irport_interrupt()
787 static inline void irport_receive(struct irport_cb
*self
)
792 ASSERT(self
!= NULL
, return;);
794 iobase
= self
->io
.sir_base
;
797 * Receive all characters in Rx FIFO, unwrap and unstuff them.
798 * async_unwrap_char will deliver all found frames
801 async_unwrap_char(self
->netdev
, &self
->stats
, &self
->rx_buff
,
802 inb(iobase
+UART_RX
));
804 /* Make sure we don't stay here too long */
805 if (boguscount
++ > 32) {
806 IRDA_DEBUG(2,"%s(), breaking!\n", __FUNCTION__
);
809 } while (inb(iobase
+UART_LSR
) & UART_LSR_DR
);
813 * Function irport_interrupt (irq, dev_id, regs)
817 irqreturn_t
irport_interrupt(int irq
, void *dev_id
, struct pt_regs
*regs
)
819 struct net_device
*dev
= (struct net_device
*) dev_id
;
820 struct irport_cb
*self
;
827 WARNING("%s() irq %d for unknown device.\n", __FUNCTION__
, irq
);
830 self
= (struct irport_cb
*) dev
->priv
;
832 spin_lock(&self
->lock
);
834 iobase
= self
->io
.sir_base
;
836 /* Cut'n'paste interrupt routine from serial.c
837 * This version try to minimise latency and I/O operations.
838 * Simplified and modified to enforce half duplex operation.
841 /* Check status even is iir reg is cleared, more robust and
842 * eliminate a read on the I/O bus - Jean II */
844 /* Get interrupt status ; Clear interrupt */
845 lsr
= inb(iobase
+UART_LSR
);
847 /* Are we receiving or transmitting ? */
848 if(!self
->transmitting
) {
849 /* Received something ? */
850 if (lsr
& UART_LSR_DR
)
851 irport_receive(self
);
853 /* Room in Tx fifo ? */
854 if (lsr
& (UART_LSR_THRE
| UART_LSR_TEMT
))
855 irport_write_wakeup(self
);
858 /* A bit hackish, but working as expected... Jean II */
859 if(lsr
& (UART_LSR_THRE
| UART_LSR_TEMT
| UART_LSR_DR
))
862 /* Make sure we don't stay here to long */
863 if (boguscount
++ > 10) {
864 WARNING("%s() irq handler looping : lsr=%02x\n",
869 /* Read interrupt register */
870 iir
= inb(iobase
+UART_IIR
);
872 /* Enable this debug only when no other options and at low
873 * bit rates, otherwise it may cause Rx overruns (lsr=63).
875 IRDA_DEBUG(6, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
876 __FUNCTION__
, iir
, lsr
, iobase
);
878 /* As long as interrupt pending... */
879 } while ((iir
& UART_IIR_NO_INT
) == 0);
881 spin_unlock(&self
->lock
);
882 return IRQ_RETVAL(handled
);
886 * Function irport_net_open (dev)
888 * Network device is taken up. Usually this is done by "ifconfig irda0 up"
891 int irport_net_open(struct net_device
*dev
)
893 struct irport_cb
*self
;
898 IRDA_DEBUG(2, "%s()\n", __FUNCTION__
);
900 ASSERT(dev
!= NULL
, return -1;);
901 self
= (struct irport_cb
*) dev
->priv
;
903 iobase
= self
->io
.sir_base
;
905 if (request_irq(self
->io
.irq
, self
->interrupt
, 0, dev
->name
,
907 IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
908 __FUNCTION__
, self
->io
.irq
);
912 spin_lock_irqsave(&self
->lock
, flags
);
915 /* Set 9600 bauds per default, including at the dongle */
916 irda_task_execute(self
, __irport_change_speed
,
917 irport_change_speed_complete
,
918 NULL
, (void *) 9600);
919 spin_unlock_irqrestore(&self
->lock
, flags
);
922 /* Give self a hardware name */
923 sprintf(hwname
, "SIR @ 0x%03x", self
->io
.sir_base
);
926 * Open new IrLAP layer instance, now that everything should be
927 * initialized properly
929 self
->irlap
= irlap_open(dev
, &self
->qos
, hwname
);
933 netif_start_queue(dev
);
939 * Function irport_net_close (self)
941 * Network device is taken down. Usually this is done by
942 * "ifconfig irda0 down"
944 int irport_net_close(struct net_device
*dev
)
946 struct irport_cb
*self
;
950 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
952 ASSERT(dev
!= NULL
, return -1;);
953 self
= (struct irport_cb
*) dev
->priv
;
955 ASSERT(self
!= NULL
, return -1;);
957 iobase
= self
->io
.sir_base
;
960 netif_stop_queue(dev
);
962 /* Stop and remove instance of IrLAP */
964 irlap_close(self
->irlap
);
967 spin_lock_irqsave(&self
->lock
, flags
);
969 spin_unlock_irqrestore(&self
->lock
, flags
);
971 free_irq(self
->io
.irq
, dev
);
977 * Function irport_is_receiving (self)
979 * Returns true is we are currently receiving data
982 static inline int irport_is_receiving(struct irport_cb
*self
)
984 return (self
->rx_buff
.state
!= OUTSIDE_FRAME
);
988 * Function irport_set_dtr_rts (tty, dtr, rts)
990 * This function can be used by dongles etc. to set or reset the status
991 * of the dtr and rts lines
993 static int irport_set_dtr_rts(struct net_device
*dev
, int dtr
, int rts
)
995 struct irport_cb
*self
= dev
->priv
;
998 ASSERT(self
!= NULL
, return -1;);
1000 iobase
= self
->io
.sir_base
;
1007 outb(dtr
|rts
|UART_MCR_OUT2
, iobase
+UART_MCR
);
1012 static int irport_raw_write(struct net_device
*dev
, __u8
*buf
, int len
)
1014 struct irport_cb
*self
= (struct irport_cb
*) dev
->priv
;
1018 ASSERT(self
!= NULL
, return -1;);
1020 iobase
= self
->io
.sir_base
;
1022 /* Tx FIFO should be empty! */
1023 if (!(inb(iobase
+UART_LSR
) & UART_LSR_THRE
)) {
1024 IRDA_DEBUG( 0, "%s(), failed, fifo not empty!\n", __FUNCTION__
);
1028 /* Fill FIFO with current frame */
1029 while (actual
< len
) {
1030 /* Transmit next byte */
1031 outb(buf
[actual
], iobase
+UART_TX
);
1039 * Function irport_net_ioctl (dev, rq, cmd)
1041 * Process IOCTL commands for this device
1044 static int irport_net_ioctl(struct net_device
*dev
, struct ifreq
*rq
, int cmd
)
1046 struct if_irda_req
*irq
= (struct if_irda_req
*) rq
;
1047 struct irport_cb
*self
;
1049 unsigned long flags
;
1052 ASSERT(dev
!= NULL
, return -1;);
1056 ASSERT(self
!= NULL
, return -1;);
1058 IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__
, dev
->name
, cmd
);
1061 case SIOCSBANDWIDTH
: /* Set bandwidth */
1062 if (!capable(CAP_NET_ADMIN
))
1065 irda_task_execute(self
, __irport_change_speed
, NULL
,
1066 NULL
, (void *) irq
->ifr_baudrate
);
1068 case SIOCSDONGLE
: /* Set dongle */
1069 if (!capable(CAP_NET_ADMIN
)) {
1075 * irda_device_dongle_init() can't be locked.
1076 * irda_task_execute() doesn't need to be locked.
1080 /* Initialize dongle */
1081 dongle
= irda_device_dongle_init(dev
, irq
->ifr_dongle
);
1085 dongle
->set_mode
= NULL
;
1086 dongle
->read
= NULL
;
1087 dongle
->write
= irport_raw_write
;
1088 dongle
->set_dtr_rts
= irport_set_dtr_rts
;
1090 /* Now initialize the dongle! */
1091 dongle
->issue
->open(dongle
, &self
->qos
);
1094 irda_task_execute(dongle
, dongle
->issue
->reset
, NULL
, NULL
,
1097 /* Make dongle available to driver only now to avoid
1098 * race conditions - Jean II */
1099 self
->dongle
= dongle
;
1101 case SIOCSMEDIABUSY
: /* Set media busy */
1102 if (!capable(CAP_NET_ADMIN
)) {
1107 irda_device_set_media_busy(self
->netdev
, TRUE
);
1109 case SIOCGRECEIVING
: /* Check if we are receiving right now */
1110 irq
->ifr_receiving
= irport_is_receiving(self
);
1113 if (!capable(CAP_NET_ADMIN
)) {
1118 /* No real need to lock... */
1119 spin_lock_irqsave(&self
->lock
, flags
);
1120 irport_set_dtr_rts(dev
, irq
->ifr_dtr
, irq
->ifr_rts
);
1121 spin_unlock_irqrestore(&self
->lock
, flags
);
1130 static struct net_device_stats
*irport_net_get_stats(struct net_device
*dev
)
1132 struct irport_cb
*self
= (struct irport_cb
*) dev
->priv
;
1134 return &self
->stats
;
1137 MODULE_PARM(io
, "1-4i");
1138 MODULE_PARM_DESC(io
, "Base I/O addresses");
1139 MODULE_PARM(irq
, "1-4i");
1140 MODULE_PARM_DESC(irq
, "IRQ lines");
1142 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1143 MODULE_DESCRIPTION("Half duplex serial driver for IrDA SIR mode");
1144 MODULE_LICENSE("GPL");
1146 module_init(irport_init
);
1147 module_exit(irport_cleanup
);