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>
54 #include <linux/bitops.h>
56 #include <asm/system.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 static irqreturn_t
irport_interrupt(int irq
, void *dev_id
,
91 struct pt_regs
*regs
);
92 static int irport_hard_xmit(struct sk_buff
*skb
, struct net_device
*dev
);
93 static void irport_change_speed(void *priv
, __u32 speed
);
94 static int irport_net_open(struct net_device
*dev
);
95 static int irport_net_close(struct net_device
*dev
);
97 static struct irport_cb
*
98 irport_open(int i
, unsigned int iobase
, unsigned int irq
)
100 struct net_device
*dev
;
101 struct irport_cb
*self
;
103 IRDA_DEBUG(1, "%s()\n", __FUNCTION__
);
105 /* Lock the port that we need */
106 if (!request_region(iobase
, IO_EXTENT
, driver_name
)) {
107 IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
108 __FUNCTION__
, iobase
);
113 * Allocate new instance of the driver
115 dev
= alloc_irdadev(sizeof(struct irport_cb
));
117 IRDA_ERROR("%s(), can't allocate memory for "
118 "irda device!\n", __FUNCTION__
);
123 spin_lock_init(&self
->lock
);
125 /* Need to store self somewhere */
131 self
->io
.sir_base
= iobase
;
132 self
->io
.sir_ext
= IO_EXTENT
;
134 self
->io
.fifo_size
= 16; /* 16550A and compatible */
136 /* Initialize QoS for this device */
137 irda_init_max_qos_capabilies(&self
->qos
);
139 self
->qos
.baud_rate
.bits
= IR_9600
|IR_19200
|IR_38400
|IR_57600
|
142 self
->qos
.min_turn_time
.bits
= qos_mtt_bits
;
143 irda_qos_bits_to_value(&self
->qos
);
145 /* Bootstrap ZeroCopy Rx */
146 self
->rx_buff
.truesize
= IRDA_SKB_MAX_MTU
;
147 self
->rx_buff
.skb
= __dev_alloc_skb(self
->rx_buff
.truesize
,
149 if (self
->rx_buff
.skb
== NULL
) {
150 IRDA_ERROR("%s(), can't allocate memory for "
151 "receive buffer!\n", __FUNCTION__
);
154 skb_reserve(self
->rx_buff
.skb
, 1);
155 self
->rx_buff
.head
= self
->rx_buff
.skb
->data
;
156 /* No need to memset the buffer, unless you are really pedantic */
158 /* Finish setup the Rx buffer descriptor */
159 self
->rx_buff
.in_frame
= FALSE
;
160 self
->rx_buff
.state
= OUTSIDE_FRAME
;
161 self
->rx_buff
.data
= self
->rx_buff
.head
;
163 /* Specify how much memory we want */
164 self
->tx_buff
.truesize
= 4000;
166 /* Allocate memory if needed */
167 if (self
->tx_buff
.truesize
> 0) {
168 self
->tx_buff
.head
= (__u8
*) kmalloc(self
->tx_buff
.truesize
,
170 if (self
->tx_buff
.head
== NULL
) {
171 IRDA_ERROR("%s(), can't allocate memory for "
172 "transmit buffer!\n", __FUNCTION__
);
175 memset(self
->tx_buff
.head
, 0, self
->tx_buff
.truesize
);
177 self
->tx_buff
.data
= self
->tx_buff
.head
;
180 /* Keep track of module usage */
181 SET_MODULE_OWNER(dev
);
183 /* May be overridden by piggyback drivers */
184 self
->interrupt
= irport_interrupt
;
185 self
->change_speed
= irport_change_speed
;
187 /* Override the network functions we need to use */
188 dev
->hard_start_xmit
= irport_hard_xmit
;
189 dev
->tx_timeout
= irport_timeout
;
190 dev
->watchdog_timeo
= HZ
; /* Allow time enough for speed change */
191 dev
->open
= irport_net_open
;
192 dev
->stop
= irport_net_close
;
193 dev
->get_stats
= irport_net_get_stats
;
194 dev
->do_ioctl
= irport_net_ioctl
;
196 /* Make ifconfig display some details */
197 dev
->base_addr
= iobase
;
200 if (register_netdev(dev
)) {
201 IRDA_ERROR("%s(), register_netdev() failed!\n", __FUNCTION__
);
204 IRDA_MESSAGE("IrDA: Registered device %s (irport io=0x%X irq=%d)\n",
205 dev
->name
, iobase
, irq
);
209 kfree(self
->tx_buff
.head
);
211 kfree_skb(self
->rx_buff
.skb
);
216 release_region(iobase
, IO_EXTENT
);
221 static int irport_close(struct irport_cb
*self
)
223 IRDA_ASSERT(self
!= NULL
, return -1;);
225 /* We are not using any dongle anymore! */
227 irda_device_dongle_cleanup(self
->dongle
);
230 /* Remove netdevice */
231 unregister_netdev(self
->netdev
);
233 /* Release the IO-port that this driver is using */
234 IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
235 __FUNCTION__
, self
->io
.sir_base
);
236 release_region(self
->io
.sir_base
, self
->io
.sir_ext
);
238 kfree(self
->tx_buff
.head
);
240 if (self
->rx_buff
.skb
)
241 kfree_skb(self
->rx_buff
.skb
);
242 self
->rx_buff
.skb
= NULL
;
244 /* Remove ourselves */
245 dev_self
[self
->index
] = NULL
;
246 free_netdev(self
->netdev
);
251 static void irport_stop(struct irport_cb
*self
)
255 iobase
= self
->io
.sir_base
;
257 /* We can't lock, we may be called from a FIR driver - Jean II */
259 /* We are not transmitting any more */
260 self
->transmitting
= 0;
263 outb(0, iobase
+UART_MCR
);
265 /* Turn off interrupts */
266 outb(0, iobase
+UART_IER
);
269 static void irport_start(struct irport_cb
*self
)
273 iobase
= self
->io
.sir_base
;
277 /* We can't lock, we may be called from a FIR driver - Jean II */
279 /* Initialize UART */
280 outb(UART_LCR_WLEN8
, iobase
+UART_LCR
); /* Reset DLAB */
281 outb((UART_MCR_DTR
| UART_MCR_RTS
| UART_MCR_OUT2
), iobase
+UART_MCR
);
283 /* Turn on interrups */
284 outb(UART_IER_RLSI
| UART_IER_RDI
|UART_IER_THRI
, iobase
+UART_IER
);
288 * Function irport_get_fcr (speed)
290 * Compute value of fcr
293 static inline unsigned int irport_get_fcr(__u32 speed
)
295 unsigned int fcr
; /* FIFO control reg */
298 fcr
= UART_FCR_ENABLE_FIFO
;
301 * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
302 * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
303 * about this timeout since it will always be fast enough.
306 fcr
|= UART_FCR_TRIGGER_1
;
308 //fcr |= UART_FCR_TRIGGER_14;
309 fcr
|= UART_FCR_TRIGGER_8
;
315 * Function irport_change_speed (self, speed)
317 * Set speed of IrDA port to specified baudrate
319 * This function should be called with irq off and spin-lock.
321 static void irport_change_speed(void *priv
, __u32 speed
)
323 struct irport_cb
*self
= (struct irport_cb
*) priv
;
325 unsigned int fcr
; /* FIFO control reg */
326 unsigned int lcr
; /* Line control reg */
329 IRDA_ASSERT(self
!= NULL
, return;);
330 IRDA_ASSERT(speed
!= 0, return;);
332 IRDA_DEBUG(1, "%s(), Setting speed to: %d - iobase=%#x\n",
333 __FUNCTION__
, speed
, self
->io
.sir_base
);
335 /* We can't lock, we may be called from a FIR driver - Jean II */
337 iobase
= self
->io
.sir_base
;
339 /* Update accounting for new speed */
340 self
->io
.speed
= speed
;
342 /* Turn off interrupts */
343 outb(0, iobase
+UART_IER
);
345 divisor
= SPEED_MAX
/speed
;
347 /* Get proper fifo configuration */
348 fcr
= irport_get_fcr(speed
);
350 /* IrDA ports use 8N1 */
351 lcr
= UART_LCR_WLEN8
;
353 outb(UART_LCR_DLAB
| lcr
, iobase
+UART_LCR
); /* Set DLAB */
354 outb(divisor
& 0xff, iobase
+UART_DLL
); /* Set speed */
355 outb(divisor
>> 8, iobase
+UART_DLM
);
356 outb(lcr
, iobase
+UART_LCR
); /* Set 8N1 */
357 outb(fcr
, iobase
+UART_FCR
); /* Enable FIFO's */
359 /* Turn on interrups */
360 /* This will generate a fatal interrupt storm.
361 * People calling us will do that properly - Jean II */
362 //outb(/*UART_IER_RLSI|*/UART_IER_RDI/*|UART_IER_THRI*/, iobase+UART_IER);
366 * Function __irport_change_speed (instance, state, param)
368 * State machine for changing speed of the device. We do it this way since
369 * we cannot use schedule_timeout() when we are in interrupt context
372 static int __irport_change_speed(struct irda_task
*task
)
374 struct irport_cb
*self
;
375 __u32 speed
= (__u32
) task
->param
;
376 unsigned long flags
= 0;
380 IRDA_DEBUG(2, "%s(), <%ld>\n", __FUNCTION__
, jiffies
);
382 self
= (struct irport_cb
*) task
->instance
;
384 IRDA_ASSERT(self
!= NULL
, return -1;);
386 /* Locking notes : this function may be called from irq context with
387 * spinlock, via irport_write_wakeup(), or from non-interrupt without
388 * spinlock (from the task timer). Yuck !
389 * This is ugly, and unsafe is the spinlock is not already acquired.
390 * This will be fixed when irda-task get rewritten.
392 if (!spin_is_locked(&self
->lock
)) {
393 spin_lock_irqsave(&self
->lock
, flags
);
397 switch (task
->state
) {
400 /* Are we ready to change speed yet? */
401 if (self
->tx_buff
.len
> 0) {
402 task
->state
= IRDA_TASK_WAIT
;
404 /* Try again later */
405 ret
= msecs_to_jiffies(20);
410 irda_task_next_state(task
, IRDA_TASK_CHILD_INIT
);
412 irda_task_next_state(task
, IRDA_TASK_CHILD_DONE
);
414 case IRDA_TASK_CHILD_INIT
:
415 /* Go to default speed */
416 self
->change_speed(self
->priv
, 9600);
418 /* Change speed of dongle */
419 if (irda_task_execute(self
->dongle
,
420 self
->dongle
->issue
->change_speed
,
421 NULL
, task
, (void *) speed
))
423 /* Dongle need more time to change its speed */
424 irda_task_next_state(task
, IRDA_TASK_CHILD_WAIT
);
426 /* Give dongle 1 sec to finish */
427 ret
= msecs_to_jiffies(1000);
429 /* Child finished immediately */
430 irda_task_next_state(task
, IRDA_TASK_CHILD_DONE
);
432 case IRDA_TASK_CHILD_WAIT
:
433 IRDA_WARNING("%s(), changing speed of dongle timed out!\n", __FUNCTION__
);
436 case IRDA_TASK_CHILD_DONE
:
437 /* Finally we are ready to change the speed */
438 self
->change_speed(self
->priv
, speed
);
440 irda_task_next_state(task
, IRDA_TASK_DONE
);
443 IRDA_ERROR("%s(), unknown state %d\n",
444 __FUNCTION__
, task
->state
);
445 irda_task_next_state(task
, IRDA_TASK_DONE
);
449 /* Put stuff in the state we found them - Jean II */
451 spin_unlock_irqrestore(&self
->lock
, flags
);
458 * Function irport_change_speed_complete (task)
460 * Called when the change speed operation completes
463 static int irport_change_speed_complete(struct irda_task
*task
)
465 struct irport_cb
*self
;
467 IRDA_DEBUG(1, "%s()\n", __FUNCTION__
);
469 self
= (struct irport_cb
*) task
->instance
;
471 IRDA_ASSERT(self
!= NULL
, return -1;);
472 IRDA_ASSERT(self
->netdev
!= NULL
, return -1;);
474 /* Finished changing speed, so we are not busy any longer */
475 /* Signal network layer so it can try to send the frame */
477 netif_wake_queue(self
->netdev
);
483 * Function irport_timeout (struct net_device *dev)
485 * The networking layer thinks we timed out.
489 static void irport_timeout(struct net_device
*dev
)
491 struct irport_cb
*self
;
496 self
= (struct irport_cb
*) dev
->priv
;
497 IRDA_ASSERT(self
!= NULL
, return;);
498 iobase
= self
->io
.sir_base
;
500 IRDA_WARNING("%s: transmit timed out, jiffies = %ld, trans_start = %ld\n",
501 dev
->name
, jiffies
, dev
->trans_start
);
502 spin_lock_irqsave(&self
->lock
, flags
);
504 /* Debug what's happening... */
506 /* Get interrupt status */
507 lsr
= inb(iobase
+UART_LSR
);
508 /* Read interrupt register */
509 iir
= inb(iobase
+UART_IIR
);
510 IRDA_DEBUG(0, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
511 __FUNCTION__
, iir
, lsr
, iobase
);
513 IRDA_DEBUG(0, "%s(), transmitting=%d, remain=%d, done=%d\n",
514 __FUNCTION__
, self
->transmitting
, self
->tx_buff
.len
,
515 self
->tx_buff
.data
- self
->tx_buff
.head
);
517 /* Now, restart the port */
519 self
->change_speed(self
->priv
, self
->io
.speed
);
520 /* This will re-enable irqs */
521 outb(/*UART_IER_RLSI|*/UART_IER_RDI
/*|UART_IER_THRI*/, iobase
+UART_IER
);
522 dev
->trans_start
= jiffies
;
523 spin_unlock_irqrestore(&self
->lock
, flags
);
525 netif_wake_queue(dev
);
529 * Function irport_wait_hw_transmitter_finish ()
531 * Wait for the real end of HW transmission
533 * The UART is a strict FIFO, and we get called only when we have finished
534 * pushing data to the FIFO, so the maximum amount of time we must wait
535 * is only for the FIFO to drain out.
537 * We use a simple calibrated loop. We may need to adjust the loop
538 * delay (udelay) to balance I/O traffic and latency. And we also need to
539 * adjust the maximum timeout.
540 * It would probably be better to wait for the proper interrupt,
541 * but it doesn't seem to be available.
543 * We can't use jiffies or kernel timers because :
544 * 1) We are called from the interrupt handler, which disable softirqs,
545 * so jiffies won't be increased
546 * 2) Jiffies granularity is usually very coarse (10ms), and we don't
547 * want to wait that long to detect stuck hardware.
551 static void irport_wait_hw_transmitter_finish(struct irport_cb
*self
)
554 int count
= 1000; /* 1 ms */
556 iobase
= self
->io
.sir_base
;
558 /* Calibrated busy loop */
559 while((count
-- > 0) && !(inb(iobase
+UART_LSR
) & UART_LSR_TEMT
))
563 IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__
);
567 * Function irport_hard_start_xmit (struct sk_buff *skb, struct net_device *dev)
569 * Transmits the current frame until FIFO is full, then
570 * waits until the next transmitt interrupt, and continues until the
571 * frame is transmitted.
573 static int irport_hard_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
575 struct irport_cb
*self
;
580 IRDA_DEBUG(1, "%s()\n", __FUNCTION__
);
582 IRDA_ASSERT(dev
!= NULL
, return 0;);
584 self
= (struct irport_cb
*) dev
->priv
;
585 IRDA_ASSERT(self
!= NULL
, return 0;);
587 iobase
= self
->io
.sir_base
;
589 netif_stop_queue(dev
);
591 /* Make sure tests & speed change are atomic */
592 spin_lock_irqsave(&self
->lock
, flags
);
594 /* Check if we need to change the speed */
595 speed
= irda_get_next_speed(skb
);
596 if ((speed
!= self
->io
.speed
) && (speed
!= -1)) {
597 /* Check for empty frame */
600 * We send frames one by one in SIR mode (no
601 * pipelining), so at this point, if we were sending
602 * a previous frame, we just received the interrupt
603 * telling us it is finished (UART_IIR_THRI).
604 * Therefore, waiting for the transmitter to really
605 * finish draining the fifo won't take too long.
606 * And the interrupt handler is not expected to run.
608 irport_wait_hw_transmitter_finish(self
);
609 /* Better go there already locked - Jean II */
610 irda_task_execute(self
, __irport_change_speed
,
611 irport_change_speed_complete
,
612 NULL
, (void *) speed
);
613 dev
->trans_start
= jiffies
;
614 spin_unlock_irqrestore(&self
->lock
, flags
);
618 self
->new_speed
= speed
;
622 self
->tx_buff
.data
= self
->tx_buff
.head
;
624 /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
625 self
->tx_buff
.len
= async_wrap_skb(skb
, self
->tx_buff
.data
,
626 self
->tx_buff
.truesize
);
628 self
->stats
.tx_bytes
+= self
->tx_buff
.len
;
630 /* We are transmitting */
631 self
->transmitting
= 1;
633 /* Turn on transmit finished interrupt. Will fire immediately! */
634 outb(UART_IER_THRI
, iobase
+UART_IER
);
636 dev
->trans_start
= jiffies
;
637 spin_unlock_irqrestore(&self
->lock
, flags
);
645 * Function irport_write (driver)
647 * Fill Tx FIFO with transmit data
649 * Called only from irport_write_wakeup()
651 static inline int irport_write(int iobase
, int fifo_size
, __u8
*buf
, int len
)
655 /* Fill FIFO with current frame */
656 while ((actual
< fifo_size
) && (actual
< len
)) {
657 /* Transmit next byte */
658 outb(buf
[actual
], iobase
+UART_TX
);
667 * Function irport_write_wakeup (tty)
669 * Called by the driver when there's room for more data. If we have
670 * more packets to send, we send them here.
672 * Called only from irport_interrupt()
673 * Make sure this function is *not* called while we are receiving,
674 * otherwise we will reset fifo and loose data :-(
676 static inline void irport_write_wakeup(struct irport_cb
*self
)
682 IRDA_ASSERT(self
!= NULL
, return;);
684 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
686 iobase
= self
->io
.sir_base
;
688 /* Finished with frame? */
689 if (self
->tx_buff
.len
> 0) {
690 /* Write data left in transmit buffer */
691 actual
= irport_write(iobase
, self
->io
.fifo_size
,
692 self
->tx_buff
.data
, self
->tx_buff
.len
);
693 self
->tx_buff
.data
+= actual
;
694 self
->tx_buff
.len
-= actual
;
697 * Now serial buffer is almost free & we can start
698 * transmission of another packet. But first we must check
699 * if we need to change the speed of the hardware
701 if (self
->new_speed
) {
702 irport_wait_hw_transmitter_finish(self
);
703 irda_task_execute(self
, __irport_change_speed
,
704 irport_change_speed_complete
,
705 NULL
, (void *) self
->new_speed
);
708 /* Tell network layer that we want more frames */
709 netif_wake_queue(self
->netdev
);
711 self
->stats
.tx_packets
++;
714 * Reset Rx FIFO to make sure that all reflected transmit data
715 * is discarded. This is needed for half duplex operation
717 fcr
= irport_get_fcr(self
->io
.speed
);
718 fcr
|= UART_FCR_CLEAR_RCVR
;
719 outb(fcr
, iobase
+UART_FCR
);
721 /* Finished transmitting */
722 self
->transmitting
= 0;
724 /* Turn on receive interrupts */
725 outb(UART_IER_RDI
, iobase
+UART_IER
);
727 IRDA_DEBUG(1, "%s() : finished Tx\n", __FUNCTION__
);
732 * Function irport_receive (self)
734 * Receive one frame from the infrared port
736 * Called only from irport_interrupt()
738 static inline void irport_receive(struct irport_cb
*self
)
743 IRDA_ASSERT(self
!= NULL
, return;);
745 iobase
= self
->io
.sir_base
;
748 * Receive all characters in Rx FIFO, unwrap and unstuff them.
749 * async_unwrap_char will deliver all found frames
752 async_unwrap_char(self
->netdev
, &self
->stats
, &self
->rx_buff
,
753 inb(iobase
+UART_RX
));
755 /* Make sure we don't stay here too long */
756 if (boguscount
++ > 32) {
757 IRDA_DEBUG(2,"%s(), breaking!\n", __FUNCTION__
);
760 } while (inb(iobase
+UART_LSR
) & UART_LSR_DR
);
764 * Function irport_interrupt (irq, dev_id, regs)
768 static irqreturn_t
irport_interrupt(int irq
, void *dev_id
,
769 struct pt_regs
*regs
)
771 struct net_device
*dev
= (struct net_device
*) dev_id
;
772 struct irport_cb
*self
;
779 IRDA_WARNING("%s() irq %d for unknown device.\n", __FUNCTION__
, irq
);
782 self
= (struct irport_cb
*) dev
->priv
;
784 spin_lock(&self
->lock
);
786 iobase
= self
->io
.sir_base
;
788 /* Cut'n'paste interrupt routine from serial.c
789 * This version try to minimise latency and I/O operations.
790 * Simplified and modified to enforce half duplex operation.
793 /* Check status even is iir reg is cleared, more robust and
794 * eliminate a read on the I/O bus - Jean II */
796 /* Get interrupt status ; Clear interrupt */
797 lsr
= inb(iobase
+UART_LSR
);
799 /* Are we receiving or transmitting ? */
800 if(!self
->transmitting
) {
801 /* Received something ? */
802 if (lsr
& UART_LSR_DR
)
803 irport_receive(self
);
805 /* Room in Tx fifo ? */
806 if (lsr
& (UART_LSR_THRE
| UART_LSR_TEMT
))
807 irport_write_wakeup(self
);
810 /* A bit hackish, but working as expected... Jean II */
811 if(lsr
& (UART_LSR_THRE
| UART_LSR_TEMT
| UART_LSR_DR
))
814 /* Make sure we don't stay here to long */
815 if (boguscount
++ > 10) {
816 IRDA_WARNING("%s() irq handler looping : lsr=%02x\n",
821 /* Read interrupt register */
822 iir
= inb(iobase
+UART_IIR
);
824 /* Enable this debug only when no other options and at low
825 * bit rates, otherwise it may cause Rx overruns (lsr=63).
827 IRDA_DEBUG(6, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
828 __FUNCTION__
, iir
, lsr
, iobase
);
830 /* As long as interrupt pending... */
831 } while ((iir
& UART_IIR_NO_INT
) == 0);
833 spin_unlock(&self
->lock
);
834 return IRQ_RETVAL(handled
);
838 * Function irport_net_open (dev)
840 * Network device is taken up. Usually this is done by "ifconfig irda0 up"
843 static int irport_net_open(struct net_device
*dev
)
845 struct irport_cb
*self
;
850 IRDA_DEBUG(2, "%s()\n", __FUNCTION__
);
852 IRDA_ASSERT(dev
!= NULL
, return -1;);
853 self
= (struct irport_cb
*) dev
->priv
;
855 iobase
= self
->io
.sir_base
;
857 if (request_irq(self
->io
.irq
, self
->interrupt
, 0, dev
->name
,
859 IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
860 __FUNCTION__
, self
->io
.irq
);
864 spin_lock_irqsave(&self
->lock
, flags
);
867 /* Set 9600 bauds per default, including at the dongle */
868 irda_task_execute(self
, __irport_change_speed
,
869 irport_change_speed_complete
,
870 NULL
, (void *) 9600);
871 spin_unlock_irqrestore(&self
->lock
, flags
);
874 /* Give self a hardware name */
875 sprintf(hwname
, "SIR @ 0x%03x", self
->io
.sir_base
);
878 * Open new IrLAP layer instance, now that everything should be
879 * initialized properly
881 self
->irlap
= irlap_open(dev
, &self
->qos
, hwname
);
885 netif_start_queue(dev
);
891 * Function irport_net_close (self)
893 * Network device is taken down. Usually this is done by
894 * "ifconfig irda0 down"
896 static int irport_net_close(struct net_device
*dev
)
898 struct irport_cb
*self
;
902 IRDA_DEBUG(4, "%s()\n", __FUNCTION__
);
904 IRDA_ASSERT(dev
!= NULL
, return -1;);
905 self
= (struct irport_cb
*) dev
->priv
;
907 IRDA_ASSERT(self
!= NULL
, return -1;);
909 iobase
= self
->io
.sir_base
;
912 netif_stop_queue(dev
);
914 /* Stop and remove instance of IrLAP */
916 irlap_close(self
->irlap
);
919 spin_lock_irqsave(&self
->lock
, flags
);
921 spin_unlock_irqrestore(&self
->lock
, flags
);
923 free_irq(self
->io
.irq
, dev
);
929 * Function irport_is_receiving (self)
931 * Returns true is we are currently receiving data
934 static inline int irport_is_receiving(struct irport_cb
*self
)
936 return (self
->rx_buff
.state
!= OUTSIDE_FRAME
);
940 * Function irport_set_dtr_rts (tty, dtr, rts)
942 * This function can be used by dongles etc. to set or reset the status
943 * of the dtr and rts lines
945 static int irport_set_dtr_rts(struct net_device
*dev
, int dtr
, int rts
)
947 struct irport_cb
*self
= dev
->priv
;
950 IRDA_ASSERT(self
!= NULL
, return -1;);
952 iobase
= self
->io
.sir_base
;
959 outb(dtr
|rts
|UART_MCR_OUT2
, iobase
+UART_MCR
);
964 static int irport_raw_write(struct net_device
*dev
, __u8
*buf
, int len
)
966 struct irport_cb
*self
= (struct irport_cb
*) dev
->priv
;
970 IRDA_ASSERT(self
!= NULL
, return -1;);
972 iobase
= self
->io
.sir_base
;
974 /* Tx FIFO should be empty! */
975 if (!(inb(iobase
+UART_LSR
) & UART_LSR_THRE
)) {
976 IRDA_DEBUG( 0, "%s(), failed, fifo not empty!\n", __FUNCTION__
);
980 /* Fill FIFO with current frame */
981 while (actual
< len
) {
982 /* Transmit next byte */
983 outb(buf
[actual
], iobase
+UART_TX
);
991 * Function irport_net_ioctl (dev, rq, cmd)
993 * Process IOCTL commands for this device
996 static int irport_net_ioctl(struct net_device
*dev
, struct ifreq
*rq
, int cmd
)
998 struct if_irda_req
*irq
= (struct if_irda_req
*) rq
;
999 struct irport_cb
*self
;
1001 unsigned long flags
;
1004 IRDA_ASSERT(dev
!= NULL
, return -1;);
1008 IRDA_ASSERT(self
!= NULL
, return -1;);
1010 IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__
, dev
->name
, cmd
);
1013 case SIOCSBANDWIDTH
: /* Set bandwidth */
1014 if (!capable(CAP_NET_ADMIN
))
1017 irda_task_execute(self
, __irport_change_speed
, NULL
,
1018 NULL
, (void *) irq
->ifr_baudrate
);
1020 case SIOCSDONGLE
: /* Set dongle */
1021 if (!capable(CAP_NET_ADMIN
)) {
1027 * irda_device_dongle_init() can't be locked.
1028 * irda_task_execute() doesn't need to be locked.
1032 /* Initialize dongle */
1033 dongle
= irda_device_dongle_init(dev
, irq
->ifr_dongle
);
1037 dongle
->set_mode
= NULL
;
1038 dongle
->read
= NULL
;
1039 dongle
->write
= irport_raw_write
;
1040 dongle
->set_dtr_rts
= irport_set_dtr_rts
;
1042 /* Now initialize the dongle! */
1043 dongle
->issue
->open(dongle
, &self
->qos
);
1046 irda_task_execute(dongle
, dongle
->issue
->reset
, NULL
, NULL
,
1049 /* Make dongle available to driver only now to avoid
1050 * race conditions - Jean II */
1051 self
->dongle
= dongle
;
1053 case SIOCSMEDIABUSY
: /* Set media busy */
1054 if (!capable(CAP_NET_ADMIN
)) {
1059 irda_device_set_media_busy(self
->netdev
, TRUE
);
1061 case SIOCGRECEIVING
: /* Check if we are receiving right now */
1062 irq
->ifr_receiving
= irport_is_receiving(self
);
1065 if (!capable(CAP_NET_ADMIN
)) {
1070 /* No real need to lock... */
1071 spin_lock_irqsave(&self
->lock
, flags
);
1072 irport_set_dtr_rts(dev
, irq
->ifr_dtr
, irq
->ifr_rts
);
1073 spin_unlock_irqrestore(&self
->lock
, flags
);
1082 static struct net_device_stats
*irport_net_get_stats(struct net_device
*dev
)
1084 struct irport_cb
*self
= (struct irport_cb
*) dev
->priv
;
1086 return &self
->stats
;
1089 static int __init
irport_init(void)
1093 for (i
=0; (io
[i
] < 2000) && (i
< 4); i
++) {
1094 if (irport_open(i
, io
[i
], irq
[i
]) != NULL
)
1098 * Maybe something failed, but we can still be usable for FIR drivers
1104 * Function irport_cleanup ()
1106 * Close all configured ports
1109 static void __exit
irport_cleanup(void)
1113 IRDA_DEBUG( 4, "%s()\n", __FUNCTION__
);
1115 for (i
=0; i
< 4; i
++) {
1117 irport_close(dev_self
[i
]);
1121 module_param_array(io
, int, NULL
, 0);
1122 MODULE_PARM_DESC(io
, "Base I/O addresses");
1123 module_param_array(irq
, int, NULL
, 0);
1124 MODULE_PARM_DESC(irq
, "IRQ lines");
1126 MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
1127 MODULE_DESCRIPTION("Half duplex serial driver for IrDA SIR mode");
1128 MODULE_LICENSE("GPL");
1130 module_init(irport_init
);
1131 module_exit(irport_cleanup
);