2 * linux/drivers/net/irda/sa1100_ir.c
4 * Copyright (C) 2000-2001 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Infra-red driver for the StrongARM SA1100 embedded microprocessor
12 * Note that we don't have to worry about the SA1111's DMA bugs in here,
13 * so we use the straight forward dma_map_* functions with a null pointer.
15 * This driver takes one kernel command line parameter, sa1100ir=, with
16 * the following options:
17 * max_rate:baudrate - set the maximum baud rate
18 * power_leve:level - set the transmitter power level
19 * tx_lpm:0|1 - set transmit low power mode
21 #include <linux/module.h>
22 #include <linux/moduleparam.h>
23 #include <linux/types.h>
24 #include <linux/init.h>
25 #include <linux/errno.h>
26 #include <linux/netdevice.h>
27 #include <linux/slab.h>
28 #include <linux/rtnetlink.h>
29 #include <linux/interrupt.h>
30 #include <linux/delay.h>
31 #include <linux/platform_device.h>
32 #include <linux/dma-mapping.h>
34 #include <net/irda/irda.h>
35 #include <net/irda/wrapper.h>
36 #include <net/irda/irda_device.h>
40 #include <asm/hardware.h>
41 #include <asm/mach/irda.h>
43 static int power_level
= 3;
45 static int max_rate
= 4000000;
56 struct sk_buff
*txskb
;
57 struct sk_buff
*rxskb
;
63 struct net_device_stats stats
;
65 struct irda_platform_data
*pdata
;
66 struct irlap_cb
*irlap
;
73 #define IS_FIR(si) ((si)->speed >= 4000000)
75 #define HPSIR_MAX_RXLEN 2047
78 * Allocate and map the receive buffer, unless it is already allocated.
80 static int sa1100_irda_rx_alloc(struct sa1100_irda
*si
)
85 si
->rxskb
= alloc_skb(HPSIR_MAX_RXLEN
+ 1, GFP_ATOMIC
);
88 printk(KERN_ERR
"sa1100_ir: out of memory for RX SKB\n");
93 * Align any IP headers that may be contained
96 skb_reserve(si
->rxskb
, 1);
98 si
->rxbuf_dma
= dma_map_single(si
->dev
, si
->rxskb
->data
,
105 * We want to get here as soon as possible, and get the receiver setup.
106 * We use the existing buffer.
108 static void sa1100_irda_rx_dma_start(struct sa1100_irda
*si
)
111 printk(KERN_ERR
"sa1100_ir: rx buffer went missing\n");
116 * First empty receive FIFO
118 Ser2HSCR0
= si
->hscr0
| HSCR0_HSSP
;
121 * Enable the DMA, receiver and receive interrupt.
123 sa1100_clear_dma(si
->rxdma
);
124 sa1100_start_dma(si
->rxdma
, si
->rxbuf_dma
, HPSIR_MAX_RXLEN
);
125 Ser2HSCR0
= si
->hscr0
| HSCR0_HSSP
| HSCR0_RXE
;
129 * Set the IrDA communications speed.
131 static int sa1100_irda_set_speed(struct sa1100_irda
*si
, int speed
)
134 int brd
, ret
= -EINVAL
;
137 case 9600: case 19200: case 38400:
138 case 57600: case 115200:
139 brd
= 3686400 / (16 * speed
) - 1;
142 * Stop the receive DMA.
145 sa1100_stop_dma(si
->rxdma
);
147 local_irq_save(flags
);
150 Ser2HSCR0
= HSCR0_UART
;
152 Ser2UTCR1
= brd
>> 8;
156 * Clear status register
158 Ser2UTSR0
= UTSR0_REB
| UTSR0_RBB
| UTSR0_RID
;
159 Ser2UTCR3
= UTCR3_RIE
| UTCR3_RXE
| UTCR3_TXE
;
161 if (si
->pdata
->set_speed
)
162 si
->pdata
->set_speed(si
->dev
, speed
);
166 local_irq_restore(flags
);
171 local_irq_save(flags
);
176 Ser2HSCR0
= si
->hscr0
| HSCR0_HSSP
;
181 if (si
->pdata
->set_speed
)
182 si
->pdata
->set_speed(si
->dev
, speed
);
184 sa1100_irda_rx_alloc(si
);
185 sa1100_irda_rx_dma_start(si
);
187 local_irq_restore(flags
);
199 * Control the power state of the IrDA transmitter.
202 * 1 - short range, lowest power
203 * 2 - medium range, medium power
204 * 3 - maximum range, high power
206 * Currently, only assabet is known to support this.
209 __sa1100_irda_set_power(struct sa1100_irda
*si
, unsigned int state
)
212 if (si
->pdata
->set_power
)
213 ret
= si
->pdata
->set_power(si
->dev
, state
);
218 sa1100_set_power(struct sa1100_irda
*si
, unsigned int state
)
222 ret
= __sa1100_irda_set_power(si
, state
);
229 static int sa1100_irda_startup(struct sa1100_irda
*si
)
234 * Ensure that the ports for this device are setup correctly.
236 if (si
->pdata
->startup
)
237 si
->pdata
->startup(si
->dev
);
240 * Configure PPC for IRDA - we want to drive TXD2 low.
241 * We also want to drive this pin low during sleep.
248 * Enable HP-SIR modulation, and ensure that the port is disabled.
251 Ser2HSCR0
= HSCR0_UART
;
252 Ser2UTCR4
= si
->utcr4
;
253 Ser2UTCR0
= UTCR0_8BitData
;
254 Ser2HSCR2
= HSCR2_TrDataH
| HSCR2_RcDataL
;
257 * Clear status register
259 Ser2UTSR0
= UTSR0_REB
| UTSR0_RBB
| UTSR0_RID
;
261 ret
= sa1100_irda_set_speed(si
, si
->speed
= 9600);
266 if (si
->pdata
->shutdown
)
267 si
->pdata
->shutdown(si
->dev
);
273 static void sa1100_irda_shutdown(struct sa1100_irda
*si
)
276 * Stop all DMA activity.
278 sa1100_stop_dma(si
->rxdma
);
279 sa1100_stop_dma(si
->txdma
);
281 /* Disable the port. */
285 if (si
->pdata
->shutdown
)
286 si
->pdata
->shutdown(si
->dev
);
291 * Suspend the IrDA interface.
293 static int sa1100_irda_suspend(struct platform_device
*pdev
, pm_message_t state
)
295 struct net_device
*dev
= platform_get_drvdata(pdev
);
296 struct sa1100_irda
*si
;
304 * Stop the transmit queue
306 netif_device_detach(dev
);
307 disable_irq(dev
->irq
);
308 sa1100_irda_shutdown(si
);
309 __sa1100_irda_set_power(si
, 0);
316 * Resume the IrDA interface.
318 static int sa1100_irda_resume(struct platform_device
*pdev
)
320 struct net_device
*dev
= platform_get_drvdata(pdev
);
321 struct sa1100_irda
*si
;
329 * If we missed a speed change, initialise at the new speed
330 * directly. It is debatable whether this is actually
331 * required, but in the interests of continuing from where
332 * we left off it is desireable. The converse argument is
333 * that we should re-negotiate at 9600 baud again.
336 si
->speed
= si
->newspeed
;
340 sa1100_irda_startup(si
);
341 __sa1100_irda_set_power(si
, si
->power
);
342 enable_irq(dev
->irq
);
345 * This automatically wakes up the queue
347 netif_device_attach(dev
);
353 #define sa1100_irda_suspend NULL
354 #define sa1100_irda_resume NULL
358 * HP-SIR format interrupt service routines.
360 static void sa1100_irda_hpsir_irq(struct net_device
*dev
)
362 struct sa1100_irda
*si
= dev
->priv
;
368 * Deal with any receive errors first. The bytes in error may be
369 * the only bytes in the receive FIFO, so we do this first.
371 while (status
& UTSR0_EIF
) {
377 if (stat
& (UTSR1_FRE
| UTSR1_ROR
)) {
378 si
->stats
.rx_errors
++;
379 if (stat
& UTSR1_FRE
)
380 si
->stats
.rx_frame_errors
++;
381 if (stat
& UTSR1_ROR
)
382 si
->stats
.rx_fifo_errors
++;
384 async_unwrap_char(dev
, &si
->stats
, &si
->rx_buff
, data
);
390 * We must clear certain bits.
392 Ser2UTSR0
= status
& (UTSR0_RID
| UTSR0_RBB
| UTSR0_REB
);
394 if (status
& UTSR0_RFS
) {
396 * There are at least 4 bytes in the FIFO. Read 3 bytes
397 * and leave the rest to the block below.
399 async_unwrap_char(dev
, &si
->stats
, &si
->rx_buff
, Ser2UTDR
);
400 async_unwrap_char(dev
, &si
->stats
, &si
->rx_buff
, Ser2UTDR
);
401 async_unwrap_char(dev
, &si
->stats
, &si
->rx_buff
, Ser2UTDR
);
404 if (status
& (UTSR0_RFS
| UTSR0_RID
)) {
406 * Fifo contains more than 1 character.
409 async_unwrap_char(dev
, &si
->stats
, &si
->rx_buff
,
411 } while (Ser2UTSR1
& UTSR1_RNE
);
413 dev
->last_rx
= jiffies
;
416 if (status
& UTSR0_TFS
&& si
->tx_buff
.len
) {
418 * Transmitter FIFO is not full
421 Ser2UTDR
= *si
->tx_buff
.data
++;
422 si
->tx_buff
.len
-= 1;
423 } while (Ser2UTSR1
& UTSR1_TNF
&& si
->tx_buff
.len
);
425 if (si
->tx_buff
.len
== 0) {
426 si
->stats
.tx_packets
++;
427 si
->stats
.tx_bytes
+= si
->tx_buff
.data
-
431 * We need to ensure that the transmitter has
436 while (Ser2UTSR1
& UTSR1_TBY
);
439 * Ok, we've finished transmitting. Now enable
440 * the receiver. Sometimes we get a receive IRQ
441 * immediately after a transmit...
443 Ser2UTSR0
= UTSR0_REB
| UTSR0_RBB
| UTSR0_RID
;
444 Ser2UTCR3
= UTCR3_RIE
| UTCR3_RXE
| UTCR3_TXE
;
447 sa1100_irda_set_speed(si
, si
->newspeed
);
452 netif_wake_queue(dev
);
457 static void sa1100_irda_fir_error(struct sa1100_irda
*si
, struct net_device
*dev
)
459 struct sk_buff
*skb
= si
->rxskb
;
461 unsigned int len
, stat
, data
;
464 printk(KERN_ERR
"sa1100_ir: SKB is NULL!\n");
469 * Get the current data position.
471 dma_addr
= sa1100_get_dma_pos(si
->rxdma
);
472 len
= dma_addr
- si
->rxbuf_dma
;
473 if (len
> HPSIR_MAX_RXLEN
)
474 len
= HPSIR_MAX_RXLEN
;
475 dma_unmap_single(si
->dev
, si
->rxbuf_dma
, len
, DMA_FROM_DEVICE
);
479 * Read Status, and then Data.
485 if (stat
& (HSSR1_CRE
| HSSR1_ROR
)) {
486 si
->stats
.rx_errors
++;
487 if (stat
& HSSR1_CRE
)
488 si
->stats
.rx_crc_errors
++;
489 if (stat
& HSSR1_ROR
)
490 si
->stats
.rx_frame_errors
++;
492 skb
->data
[len
++] = data
;
495 * If we hit the end of frame, there's
496 * no point in continuing.
498 if (stat
& HSSR1_EOF
)
500 } while (Ser2HSSR0
& HSSR0_EIF
);
502 if (stat
& HSSR1_EOF
) {
507 skb_reset_mac_header(skb
);
508 skb
->protocol
= htons(ETH_P_IRDA
);
509 si
->stats
.rx_packets
++;
510 si
->stats
.rx_bytes
+= len
;
513 * Before we pass the buffer up, allocate a new one.
515 sa1100_irda_rx_alloc(si
);
518 dev
->last_rx
= jiffies
;
523 si
->rxbuf_dma
= dma_map_single(si
->dev
, si
->rxskb
->data
,
530 * FIR format interrupt service routine. We only have to
531 * handle RX events; transmit events go via the TX DMA handler.
533 * No matter what, we disable RX, process, and the restart RX.
535 static void sa1100_irda_fir_irq(struct net_device
*dev
)
537 struct sa1100_irda
*si
= dev
->priv
;
542 sa1100_stop_dma(si
->rxdma
);
545 * Framing error - we throw away the packet completely.
546 * Clearing RXE flushes the error conditions and data
549 if (Ser2HSSR0
& (HSSR0_FRE
| HSSR0_RAB
)) {
550 si
->stats
.rx_errors
++;
552 if (Ser2HSSR0
& HSSR0_FRE
)
553 si
->stats
.rx_frame_errors
++;
556 * Clear out the DMA...
558 Ser2HSCR0
= si
->hscr0
| HSCR0_HSSP
;
561 * Clear selected status bits now, so we
562 * don't miss them next time around.
564 Ser2HSSR0
= HSSR0_FRE
| HSSR0_RAB
;
568 * Deal with any receive errors. The any of the lowest
569 * 8 bytes in the FIFO may contain an error. We must read
570 * them one by one. The "error" could even be the end of
573 if (Ser2HSSR0
& HSSR0_EIF
)
574 sa1100_irda_fir_error(si
, dev
);
577 * No matter what happens, we must restart reception.
579 sa1100_irda_rx_dma_start(si
);
582 static irqreturn_t
sa1100_irda_irq(int irq
, void *dev_id
)
584 struct net_device
*dev
= dev_id
;
585 if (IS_FIR(((struct sa1100_irda
*)dev
->priv
)))
586 sa1100_irda_fir_irq(dev
);
588 sa1100_irda_hpsir_irq(dev
);
593 * TX DMA completion handler.
595 static void sa1100_irda_txdma_irq(void *id
)
597 struct net_device
*dev
= id
;
598 struct sa1100_irda
*si
= dev
->priv
;
599 struct sk_buff
*skb
= si
->txskb
;
604 * Wait for the transmission to complete. Unfortunately,
605 * the hardware doesn't give us an interrupt to indicate
610 while (!(Ser2HSSR0
& HSSR0_TUR
) || Ser2HSSR1
& HSSR1_TBY
);
613 * Clear the transmit underrun bit.
615 Ser2HSSR0
= HSSR0_TUR
;
618 * Do we need to change speed? Note that we're lazy
619 * here - we don't free the old rxskb. We don't need
620 * to allocate a buffer either.
623 sa1100_irda_set_speed(si
, si
->newspeed
);
628 * Start reception. This disables the transmitter for
629 * us. This will be using the existing RX buffer.
631 sa1100_irda_rx_dma_start(si
);
634 * Account and free the packet.
637 dma_unmap_single(si
->dev
, si
->txbuf_dma
, skb
->len
, DMA_TO_DEVICE
);
638 si
->stats
.tx_packets
++;
639 si
->stats
.tx_bytes
+= skb
->len
;
640 dev_kfree_skb_irq(skb
);
644 * Make sure that the TX queue is available for sending
645 * (for retries). TX has priority over RX at all times.
647 netif_wake_queue(dev
);
650 static int sa1100_irda_hard_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
652 struct sa1100_irda
*si
= dev
->priv
;
653 int speed
= irda_get_next_speed(skb
);
656 * Does this packet contain a request to change the interface
657 * speed? If so, remember it until we complete the transmission
660 if (speed
!= si
->speed
&& speed
!= -1)
661 si
->newspeed
= speed
;
664 * If this is an empty frame, we can bypass a lot.
669 sa1100_irda_set_speed(si
, speed
);
676 netif_stop_queue(dev
);
678 si
->tx_buff
.data
= si
->tx_buff
.head
;
679 si
->tx_buff
.len
= async_wrap_skb(skb
, si
->tx_buff
.data
,
680 si
->tx_buff
.truesize
);
683 * Set the transmit interrupt enable. This will fire
684 * off an interrupt immediately. Note that we disable
685 * the receiver so we won't get spurious characteres
688 Ser2UTCR3
= UTCR3_TIE
| UTCR3_TXE
;
692 int mtt
= irda_get_mtt(skb
);
695 * We must not be transmitting...
699 netif_stop_queue(dev
);
702 si
->txbuf_dma
= dma_map_single(si
->dev
, skb
->data
,
703 skb
->len
, DMA_TO_DEVICE
);
705 sa1100_start_dma(si
->txdma
, si
->txbuf_dma
, skb
->len
);
708 * If we have a mean turn-around time, impose the specified
709 * specified delay. We could shorten this by timing from
710 * the point we received the packet.
715 Ser2HSCR0
= si
->hscr0
| HSCR0_HSSP
| HSCR0_TXE
;
718 dev
->trans_start
= jiffies
;
724 sa1100_irda_ioctl(struct net_device
*dev
, struct ifreq
*ifreq
, int cmd
)
726 struct if_irda_req
*rq
= (struct if_irda_req
*)ifreq
;
727 struct sa1100_irda
*si
= dev
->priv
;
728 int ret
= -EOPNOTSUPP
;
732 if (capable(CAP_NET_ADMIN
)) {
734 * We are unable to set the speed if the
735 * device is not running.
738 ret
= sa1100_irda_set_speed(si
,
741 printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n");
749 if (capable(CAP_NET_ADMIN
)) {
750 irda_device_set_media_busy(dev
, TRUE
);
756 rq
->ifr_receiving
= IS_FIR(si
) ? 0
757 : si
->rx_buff
.state
!= OUTSIDE_FRAME
;
767 static struct net_device_stats
*sa1100_irda_stats(struct net_device
*dev
)
769 struct sa1100_irda
*si
= dev
->priv
;
773 static int sa1100_irda_start(struct net_device
*dev
)
775 struct sa1100_irda
*si
= dev
->priv
;
780 err
= request_irq(dev
->irq
, sa1100_irda_irq
, 0, dev
->name
, dev
);
784 err
= sa1100_request_dma(DMA_Ser2HSSPRd
, "IrDA receive",
785 NULL
, NULL
, &si
->rxdma
);
789 err
= sa1100_request_dma(DMA_Ser2HSSPWr
, "IrDA transmit",
790 sa1100_irda_txdma_irq
, dev
, &si
->txdma
);
795 * The interrupt must remain disabled for now.
797 disable_irq(dev
->irq
);
800 * Setup the serial port for the specified speed.
802 err
= sa1100_irda_startup(si
);
807 * Open a new IrLAP layer instance.
809 si
->irlap
= irlap_open(dev
, &si
->qos
, "sa1100");
815 * Now enable the interrupt and start the queue
818 sa1100_set_power(si
, power_level
); /* low power mode */
819 enable_irq(dev
->irq
);
820 netif_start_queue(dev
);
825 sa1100_irda_shutdown(si
);
827 sa1100_free_dma(si
->txdma
);
829 sa1100_free_dma(si
->rxdma
);
831 free_irq(dev
->irq
, dev
);
836 static int sa1100_irda_stop(struct net_device
*dev
)
838 struct sa1100_irda
*si
= dev
->priv
;
840 disable_irq(dev
->irq
);
841 sa1100_irda_shutdown(si
);
844 * If we have been doing DMA receive, make sure we
845 * tidy that up cleanly.
848 dma_unmap_single(si
->dev
, si
->rxbuf_dma
, HPSIR_MAX_RXLEN
,
850 dev_kfree_skb(si
->rxskb
);
856 irlap_close(si
->irlap
);
860 netif_stop_queue(dev
);
866 sa1100_free_dma(si
->txdma
);
867 sa1100_free_dma(si
->rxdma
);
868 free_irq(dev
->irq
, dev
);
870 sa1100_set_power(si
, 0);
875 static int sa1100_irda_init_iobuf(iobuff_t
*io
, int size
)
877 io
->head
= kmalloc(size
, GFP_KERNEL
| GFP_DMA
);
878 if (io
->head
!= NULL
) {
880 io
->in_frame
= FALSE
;
881 io
->state
= OUTSIDE_FRAME
;
884 return io
->head
? 0 : -ENOMEM
;
887 static int sa1100_irda_probe(struct platform_device
*pdev
)
889 struct net_device
*dev
;
890 struct sa1100_irda
*si
;
891 unsigned int baudrate_mask
;
894 if (!pdev
->dev
.platform_data
)
897 err
= request_mem_region(__PREG(Ser2UTCR0
), 0x24, "IrDA") ? 0 : -EBUSY
;
900 err
= request_mem_region(__PREG(Ser2HSCR0
), 0x1c, "IrDA") ? 0 : -EBUSY
;
903 err
= request_mem_region(__PREG(Ser2HSCR2
), 0x04, "IrDA") ? 0 : -EBUSY
;
907 dev
= alloc_irdadev(sizeof(struct sa1100_irda
));
912 si
->dev
= &pdev
->dev
;
913 si
->pdata
= pdev
->dev
.platform_data
;
916 * Initialise the HP-SIR buffers
918 err
= sa1100_irda_init_iobuf(&si
->rx_buff
, 14384);
921 err
= sa1100_irda_init_iobuf(&si
->tx_buff
, 4000);
925 dev
->hard_start_xmit
= sa1100_irda_hard_xmit
;
926 dev
->open
= sa1100_irda_start
;
927 dev
->stop
= sa1100_irda_stop
;
928 dev
->do_ioctl
= sa1100_irda_ioctl
;
929 dev
->get_stats
= sa1100_irda_stats
;
930 dev
->irq
= IRQ_Ser2ICP
;
932 irda_init_max_qos_capabilies(&si
->qos
);
935 * We support original IRDA up to 115k2. (we don't currently
936 * support 4Mbps). Min Turn Time set to 1ms or greater.
938 baudrate_mask
= IR_9600
;
941 case 4000000: baudrate_mask
|= IR_4000000
<< 8;
942 case 115200: baudrate_mask
|= IR_115200
;
943 case 57600: baudrate_mask
|= IR_57600
;
944 case 38400: baudrate_mask
|= IR_38400
;
945 case 19200: baudrate_mask
|= IR_19200
;
948 si
->qos
.baud_rate
.bits
&= baudrate_mask
;
949 si
->qos
.min_turn_time
.bits
= 7;
951 irda_qos_bits_to_value(&si
->qos
);
953 si
->utcr4
= UTCR4_HPSIR
;
955 si
->utcr4
|= UTCR4_Z1_6us
;
958 * Initially enable HP-SIR modulation, and ensure that the port
962 Ser2UTCR4
= si
->utcr4
;
963 Ser2HSCR0
= HSCR0_UART
;
965 err
= register_netdev(dev
);
967 platform_set_drvdata(pdev
, dev
);
971 kfree(si
->tx_buff
.head
);
972 kfree(si
->rx_buff
.head
);
975 release_mem_region(__PREG(Ser2HSCR2
), 0x04);
977 release_mem_region(__PREG(Ser2HSCR0
), 0x1c);
979 release_mem_region(__PREG(Ser2UTCR0
), 0x24);
985 static int sa1100_irda_remove(struct platform_device
*pdev
)
987 struct net_device
*dev
= platform_get_drvdata(pdev
);
990 struct sa1100_irda
*si
= dev
->priv
;
991 unregister_netdev(dev
);
992 kfree(si
->tx_buff
.head
);
993 kfree(si
->rx_buff
.head
);
997 release_mem_region(__PREG(Ser2HSCR2
), 0x04);
998 release_mem_region(__PREG(Ser2HSCR0
), 0x1c);
999 release_mem_region(__PREG(Ser2UTCR0
), 0x24);
1004 static struct platform_driver sa1100ir_driver
= {
1005 .probe
= sa1100_irda_probe
,
1006 .remove
= sa1100_irda_remove
,
1007 .suspend
= sa1100_irda_suspend
,
1008 .resume
= sa1100_irda_resume
,
1010 .name
= "sa11x0-ir",
1011 .owner
= THIS_MODULE
,
1015 static int __init
sa1100_irda_init(void)
1018 * Limit power level a sensible range.
1020 if (power_level
< 1)
1022 if (power_level
> 3)
1025 return platform_driver_register(&sa1100ir_driver
);
1028 static void __exit
sa1100_irda_exit(void)
1030 platform_driver_unregister(&sa1100ir_driver
);
1033 module_init(sa1100_irda_init
);
1034 module_exit(sa1100_irda_exit
);
1035 module_param(power_level
, int, 0);
1036 module_param(tx_lpm
, int, 0);
1037 module_param(max_rate
, int, 0);
1039 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
1040 MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver");
1041 MODULE_LICENSE("GPL");
1042 MODULE_PARM_DESC(power_level
, "IrDA power level, 1 (low) to 3 (high)");
1043 MODULE_PARM_DESC(tx_lpm
, "Enable transmitter low power (1.6us) mode");
1044 MODULE_PARM_DESC(max_rate
, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)");
1045 MODULE_ALIAS("platform:sa11x0-ir");