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_level: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>
39 #include <mach/hardware.h>
40 #include <asm/mach/irda.h>
42 static int power_level = 3;
44 static int max_rate = 4000000;
60 struct sa1100_buf dma_rx;
61 struct sa1100_buf dma_tx;
64 struct irda_platform_data *pdata;
65 struct irlap_cb *irlap;
71 int (*tx_start)(struct sk_buff *, struct net_device *, struct sa1100_irda *);
72 irqreturn_t (*irq)(struct net_device *, struct sa1100_irda *);
75 static int sa1100_irda_set_speed(struct sa1100_irda *, int);
77 #define IS_FIR(si) ((si)->speed >= 4000000)
79 #define HPSIR_MAX_RXLEN 2047
82 * Allocate and map the receive buffer, unless it is already allocated.
84 static int sa1100_irda_rx_alloc(struct sa1100_irda *si)
89 si->dma_rx.skb = alloc_skb(HPSIR_MAX_RXLEN + 1, GFP_ATOMIC);
90 if (!si->dma_rx.skb) {
91 printk(KERN_ERR "sa1100_ir: out of memory for RX SKB\n");
96 * Align any IP headers that may be contained
99 skb_reserve(si->dma_rx.skb, 1);
101 si->dma_rx.dma = dma_map_single(si->dev, si->dma_rx.skb->data,
104 if (dma_mapping_error(si->dev, si->dma_rx.dma)) {
105 dev_kfree_skb_any(si->dma_rx.skb);
113 * We want to get here as soon as possible, and get the receiver setup.
114 * We use the existing buffer.
116 static void sa1100_irda_rx_dma_start(struct sa1100_irda *si)
118 if (!si->dma_rx.skb) {
119 printk(KERN_ERR "sa1100_ir: rx buffer went missing\n");
124 * First empty receive FIFO
126 Ser2HSCR0 = HSCR0_HSSP;
129 * Enable the DMA, receiver and receive interrupt.
131 sa1100_clear_dma(si->dma_rx.regs);
132 sa1100_start_dma(si->dma_rx.regs, si->dma_rx.dma, HPSIR_MAX_RXLEN);
133 Ser2HSCR0 = HSCR0_HSSP | HSCR0_RXE;
136 static void sa1100_irda_check_speed(struct sa1100_irda *si)
139 sa1100_irda_set_speed(si, si->newspeed);
145 * HP-SIR format support.
147 static int sa1100_irda_sir_tx_start(struct sk_buff *skb, struct net_device *dev,
148 struct sa1100_irda *si)
150 si->tx_buff.data = si->tx_buff.head;
151 si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data,
152 si->tx_buff.truesize);
155 * Set the transmit interrupt enable. This will fire off an
156 * interrupt immediately. Note that we disable the receiver
157 * so we won't get spurious characters received.
159 Ser2UTCR3 = UTCR3_TIE | UTCR3_TXE;
166 static irqreturn_t sa1100_irda_sir_irq(struct net_device *dev, struct sa1100_irda *si)
173 * Deal with any receive errors first. The bytes in error may be
174 * the only bytes in the receive FIFO, so we do this first.
176 while (status & UTSR0_EIF) {
182 if (stat & (UTSR1_FRE | UTSR1_ROR)) {
183 dev->stats.rx_errors++;
184 if (stat & UTSR1_FRE)
185 dev->stats.rx_frame_errors++;
186 if (stat & UTSR1_ROR)
187 dev->stats.rx_fifo_errors++;
189 async_unwrap_char(dev, &dev->stats, &si->rx_buff, data);
195 * We must clear certain bits.
197 Ser2UTSR0 = status & (UTSR0_RID | UTSR0_RBB | UTSR0_REB);
199 if (status & UTSR0_RFS) {
201 * There are at least 4 bytes in the FIFO. Read 3 bytes
202 * and leave the rest to the block below.
204 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
205 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
206 async_unwrap_char(dev, &dev->stats, &si->rx_buff, Ser2UTDR);
209 if (status & (UTSR0_RFS | UTSR0_RID)) {
211 * Fifo contains more than 1 character.
214 async_unwrap_char(dev, &dev->stats, &si->rx_buff,
216 } while (Ser2UTSR1 & UTSR1_RNE);
220 if (status & UTSR0_TFS && si->tx_buff.len) {
222 * Transmitter FIFO is not full
225 Ser2UTDR = *si->tx_buff.data++;
226 si->tx_buff.len -= 1;
227 } while (Ser2UTSR1 & UTSR1_TNF && si->tx_buff.len);
229 if (si->tx_buff.len == 0) {
230 dev->stats.tx_packets++;
231 dev->stats.tx_bytes += si->tx_buff.data -
235 * We need to ensure that the transmitter has
240 while (Ser2UTSR1 & UTSR1_TBY);
243 * Ok, we've finished transmitting. Now enable
244 * the receiver. Sometimes we get a receive IRQ
245 * immediately after a transmit...
247 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
248 Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
250 sa1100_irda_check_speed(si);
253 netif_wake_queue(dev);
261 * FIR format support.
263 static void sa1100_irda_firtxdma_irq(void *id)
265 struct net_device *dev = id;
266 struct sa1100_irda *si = netdev_priv(dev);
270 * Wait for the transmission to complete. Unfortunately,
271 * the hardware doesn't give us an interrupt to indicate
276 while (!(Ser2HSSR0 & HSSR0_TUR) || Ser2HSSR1 & HSSR1_TBY);
279 * Clear the transmit underrun bit.
281 Ser2HSSR0 = HSSR0_TUR;
284 * Do we need to change speed? Note that we're lazy
285 * here - we don't free the old dma_rx.skb. We don't need
286 * to allocate a buffer either.
288 sa1100_irda_check_speed(si);
291 * Start reception. This disables the transmitter for
292 * us. This will be using the existing RX buffer.
294 sa1100_irda_rx_dma_start(si);
296 /* Account and free the packet. */
297 skb = si->dma_tx.skb;
299 dma_unmap_single(si->dev, si->dma_tx.dma, skb->len,
301 dev->stats.tx_packets ++;
302 dev->stats.tx_bytes += skb->len;
303 dev_kfree_skb_irq(skb);
304 si->dma_tx.skb = NULL;
308 * Make sure that the TX queue is available for sending
309 * (for retries). TX has priority over RX at all times.
311 netif_wake_queue(dev);
314 static int sa1100_irda_fir_tx_start(struct sk_buff *skb, struct net_device *dev,
315 struct sa1100_irda *si)
317 int mtt = irda_get_mtt(skb);
319 si->dma_tx.skb = skb;
320 si->dma_tx.dma = dma_map_single(si->dev, skb->data, skb->len,
322 if (dma_mapping_error(si->dev, si->dma_tx.dma)) {
323 si->dma_tx.skb = NULL;
324 netif_wake_queue(dev);
325 dev->stats.tx_dropped++;
330 sa1100_start_dma(si->dma_tx.regs, si->dma_tx.dma, skb->len);
333 * If we have a mean turn-around time, impose the specified
334 * specified delay. We could shorten this by timing from
335 * the point we received the packet.
340 Ser2HSCR0 = HSCR0_HSSP | HSCR0_TXE;
345 static void sa1100_irda_fir_error(struct sa1100_irda *si, struct net_device *dev)
347 struct sk_buff *skb = si->dma_rx.skb;
349 unsigned int len, stat, data;
352 printk(KERN_ERR "sa1100_ir: SKB is NULL!\n");
357 * Get the current data position.
359 dma_addr = sa1100_get_dma_pos(si->dma_rx.regs);
360 len = dma_addr - si->dma_rx.dma;
361 if (len > HPSIR_MAX_RXLEN)
362 len = HPSIR_MAX_RXLEN;
363 dma_unmap_single(si->dev, si->dma_rx.dma, len, DMA_FROM_DEVICE);
367 * Read Status, and then Data.
373 if (stat & (HSSR1_CRE | HSSR1_ROR)) {
374 dev->stats.rx_errors++;
375 if (stat & HSSR1_CRE)
376 dev->stats.rx_crc_errors++;
377 if (stat & HSSR1_ROR)
378 dev->stats.rx_frame_errors++;
380 skb->data[len++] = data;
383 * If we hit the end of frame, there's
384 * no point in continuing.
386 if (stat & HSSR1_EOF)
388 } while (Ser2HSSR0 & HSSR0_EIF);
390 if (stat & HSSR1_EOF) {
391 si->dma_rx.skb = NULL;
395 skb_reset_mac_header(skb);
396 skb->protocol = htons(ETH_P_IRDA);
397 dev->stats.rx_packets++;
398 dev->stats.rx_bytes += len;
401 * Before we pass the buffer up, allocate a new one.
403 sa1100_irda_rx_alloc(si);
408 * Remap the buffer - it was previously mapped, and we
409 * hope that this succeeds.
411 si->dma_rx.dma = dma_map_single(si->dev, si->dma_rx.skb->data,
418 * We only have to handle RX events here; transmit events go via the TX
419 * DMA handler. We disable RX, process, and the restart RX.
421 static irqreturn_t sa1100_irda_fir_irq(struct net_device *dev, struct sa1100_irda *si)
426 sa1100_stop_dma(si->dma_rx.regs);
429 * Framing error - we throw away the packet completely.
430 * Clearing RXE flushes the error conditions and data
433 if (Ser2HSSR0 & (HSSR0_FRE | HSSR0_RAB)) {
434 dev->stats.rx_errors++;
436 if (Ser2HSSR0 & HSSR0_FRE)
437 dev->stats.rx_frame_errors++;
440 * Clear out the DMA...
442 Ser2HSCR0 = HSCR0_HSSP;
445 * Clear selected status bits now, so we
446 * don't miss them next time around.
448 Ser2HSSR0 = HSSR0_FRE | HSSR0_RAB;
452 * Deal with any receive errors. The any of the lowest
453 * 8 bytes in the FIFO may contain an error. We must read
454 * them one by one. The "error" could even be the end of
457 if (Ser2HSSR0 & HSSR0_EIF)
458 sa1100_irda_fir_error(si, dev);
461 * No matter what happens, we must restart reception.
463 sa1100_irda_rx_dma_start(si);
469 * Set the IrDA communications speed.
471 static int sa1100_irda_set_speed(struct sa1100_irda *si, int speed)
474 int brd, ret = -EINVAL;
477 case 9600: case 19200: case 38400:
478 case 57600: case 115200:
479 brd = 3686400 / (16 * speed) - 1;
482 * Stop the receive DMA.
485 sa1100_stop_dma(si->dma_rx.regs);
487 local_irq_save(flags);
490 Ser2HSCR0 = HSCR0_UART;
492 Ser2UTCR1 = brd >> 8;
496 * Clear status register
498 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
499 Ser2UTCR3 = UTCR3_RIE | UTCR3_RXE | UTCR3_TXE;
501 if (si->pdata->set_speed)
502 si->pdata->set_speed(si->dev, speed);
505 si->tx_start = sa1100_irda_sir_tx_start;
506 si->irq = sa1100_irda_sir_irq;
508 local_irq_restore(flags);
513 local_irq_save(flags);
516 Ser2HSCR0 = HSCR0_HSSP;
520 si->tx_start = sa1100_irda_fir_tx_start;
521 si->irq = sa1100_irda_fir_irq;
523 if (si->pdata->set_speed)
524 si->pdata->set_speed(si->dev, speed);
526 sa1100_irda_rx_alloc(si);
527 sa1100_irda_rx_dma_start(si);
529 local_irq_restore(flags);
541 * Control the power state of the IrDA transmitter.
544 * 1 - short range, lowest power
545 * 2 - medium range, medium power
546 * 3 - maximum range, high power
548 * Currently, only assabet is known to support this.
551 __sa1100_irda_set_power(struct sa1100_irda *si, unsigned int state)
554 if (si->pdata->set_power)
555 ret = si->pdata->set_power(si->dev, state);
560 sa1100_set_power(struct sa1100_irda *si, unsigned int state)
564 ret = __sa1100_irda_set_power(si, state);
571 static irqreturn_t sa1100_irda_irq(int irq, void *dev_id)
573 struct net_device *dev = dev_id;
574 struct sa1100_irda *si = netdev_priv(dev);
576 return si->irq(dev, si);
579 static int sa1100_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
581 struct sa1100_irda *si = netdev_priv(dev);
582 int speed = irda_get_next_speed(skb);
585 * Does this packet contain a request to change the interface
586 * speed? If so, remember it until we complete the transmission
589 if (speed != si->speed && speed != -1)
590 si->newspeed = speed;
592 /* If this is an empty frame, we can bypass a lot. */
594 sa1100_irda_check_speed(si);
599 netif_stop_queue(dev);
601 /* We must not already have a skb to transmit... */
602 BUG_ON(si->dma_tx.skb);
604 return si->tx_start(skb, dev, si);
608 sa1100_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
610 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
611 struct sa1100_irda *si = netdev_priv(dev);
612 int ret = -EOPNOTSUPP;
616 if (capable(CAP_NET_ADMIN)) {
618 * We are unable to set the speed if the
619 * device is not running.
622 ret = sa1100_irda_set_speed(si,
625 printk("sa1100_irda_ioctl: SIOCSBANDWIDTH: !netif_running\n");
633 if (capable(CAP_NET_ADMIN)) {
634 irda_device_set_media_busy(dev, TRUE);
640 rq->ifr_receiving = IS_FIR(si) ? 0
641 : si->rx_buff.state != OUTSIDE_FRAME;
651 static int sa1100_irda_startup(struct sa1100_irda *si)
656 * Ensure that the ports for this device are setup correctly.
658 if (si->pdata->startup) {
659 ret = si->pdata->startup(si->dev);
665 * Configure PPC for IRDA - we want to drive TXD2 low.
666 * We also want to drive this pin low during sleep.
673 * Enable HP-SIR modulation, and ensure that the port is disabled.
676 Ser2HSCR0 = HSCR0_UART;
677 Ser2UTCR4 = si->utcr4;
678 Ser2UTCR0 = UTCR0_8BitData;
679 Ser2HSCR2 = HSCR2_TrDataH | HSCR2_RcDataL;
682 * Clear status register
684 Ser2UTSR0 = UTSR0_REB | UTSR0_RBB | UTSR0_RID;
686 ret = sa1100_irda_set_speed(si, si->speed = 9600);
691 if (si->pdata->shutdown)
692 si->pdata->shutdown(si->dev);
698 static void sa1100_irda_shutdown(struct sa1100_irda *si)
701 * Stop all DMA activity.
703 sa1100_stop_dma(si->dma_rx.regs);
704 sa1100_stop_dma(si->dma_tx.regs);
706 /* Disable the port. */
710 if (si->pdata->shutdown)
711 si->pdata->shutdown(si->dev);
714 static int sa1100_irda_start(struct net_device *dev)
716 struct sa1100_irda *si = netdev_priv(dev);
721 err = sa1100_request_dma(DMA_Ser2HSSPRd, "IrDA receive",
722 NULL, NULL, &si->dma_rx.regs);
726 err = sa1100_request_dma(DMA_Ser2HSSPWr, "IrDA transmit",
727 sa1100_irda_firtxdma_irq, dev,
733 * Setup the serial port for the specified speed.
735 err = sa1100_irda_startup(si);
740 * Open a new IrLAP layer instance.
742 si->irlap = irlap_open(dev, &si->qos, "sa1100");
747 err = request_irq(dev->irq, sa1100_irda_irq, 0, dev->name, dev);
752 * Now enable the interrupt and start the queue
755 sa1100_set_power(si, power_level); /* low power mode */
757 netif_start_queue(dev);
761 irlap_close(si->irlap);
764 sa1100_irda_shutdown(si);
766 sa1100_free_dma(si->dma_tx.regs);
768 sa1100_free_dma(si->dma_rx.regs);
773 static int sa1100_irda_stop(struct net_device *dev)
775 struct sa1100_irda *si = netdev_priv(dev);
778 netif_stop_queue(dev);
781 sa1100_irda_shutdown(si);
784 * If we have been doing any DMA activity, make sure we
785 * tidy that up cleanly.
787 skb = si->dma_rx.skb;
789 dma_unmap_single(si->dev, si->dma_rx.dma, HPSIR_MAX_RXLEN,
792 si->dma_rx.skb = NULL;
795 skb = si->dma_tx.skb;
797 dma_unmap_single(si->dev, si->dma_tx.dma, skb->len,
800 si->dma_tx.skb = NULL;
805 irlap_close(si->irlap);
812 sa1100_free_dma(si->dma_tx.regs);
813 sa1100_free_dma(si->dma_rx.regs);
814 free_irq(dev->irq, dev);
816 sa1100_set_power(si, 0);
821 static int sa1100_irda_init_iobuf(iobuff_t *io, int size)
823 io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
824 if (io->head != NULL) {
826 io->in_frame = FALSE;
827 io->state = OUTSIDE_FRAME;
830 return io->head ? 0 : -ENOMEM;
833 static const struct net_device_ops sa1100_irda_netdev_ops = {
834 .ndo_open = sa1100_irda_start,
835 .ndo_stop = sa1100_irda_stop,
836 .ndo_start_xmit = sa1100_irda_hard_xmit,
837 .ndo_do_ioctl = sa1100_irda_ioctl,
840 static int sa1100_irda_probe(struct platform_device *pdev)
842 struct net_device *dev;
843 struct sa1100_irda *si;
844 unsigned int baudrate_mask;
847 if (!pdev->dev.platform_data)
850 irq = platform_get_irq(pdev, 0);
852 return irq < 0 ? irq : -ENXIO;
854 err = request_mem_region(__PREG(Ser2UTCR0), 0x24, "IrDA") ? 0 : -EBUSY;
857 err = request_mem_region(__PREG(Ser2HSCR0), 0x1c, "IrDA") ? 0 : -EBUSY;
860 err = request_mem_region(__PREG(Ser2HSCR2), 0x04, "IrDA") ? 0 : -EBUSY;
864 dev = alloc_irdadev(sizeof(struct sa1100_irda));
868 SET_NETDEV_DEV(dev, &pdev->dev);
870 si = netdev_priv(dev);
871 si->dev = &pdev->dev;
872 si->pdata = pdev->dev.platform_data;
875 * Initialise the HP-SIR buffers
877 err = sa1100_irda_init_iobuf(&si->rx_buff, 14384);
880 err = sa1100_irda_init_iobuf(&si->tx_buff, 4000);
884 dev->netdev_ops = &sa1100_irda_netdev_ops;
887 irda_init_max_qos_capabilies(&si->qos);
890 * We support original IRDA up to 115k2. (we don't currently
891 * support 4Mbps). Min Turn Time set to 1ms or greater.
893 baudrate_mask = IR_9600;
896 case 4000000: baudrate_mask |= IR_4000000 << 8;
897 case 115200: baudrate_mask |= IR_115200;
898 case 57600: baudrate_mask |= IR_57600;
899 case 38400: baudrate_mask |= IR_38400;
900 case 19200: baudrate_mask |= IR_19200;
903 si->qos.baud_rate.bits &= baudrate_mask;
904 si->qos.min_turn_time.bits = 7;
906 irda_qos_bits_to_value(&si->qos);
908 si->utcr4 = UTCR4_HPSIR;
910 si->utcr4 |= UTCR4_Z1_6us;
913 * Initially enable HP-SIR modulation, and ensure that the port
917 Ser2UTCR4 = si->utcr4;
918 Ser2HSCR0 = HSCR0_UART;
920 err = register_netdev(dev);
922 platform_set_drvdata(pdev, dev);
926 kfree(si->tx_buff.head);
927 kfree(si->rx_buff.head);
930 release_mem_region(__PREG(Ser2HSCR2), 0x04);
932 release_mem_region(__PREG(Ser2HSCR0), 0x1c);
934 release_mem_region(__PREG(Ser2UTCR0), 0x24);
940 static int sa1100_irda_remove(struct platform_device *pdev)
942 struct net_device *dev = platform_get_drvdata(pdev);
945 struct sa1100_irda *si = netdev_priv(dev);
946 unregister_netdev(dev);
947 kfree(si->tx_buff.head);
948 kfree(si->rx_buff.head);
952 release_mem_region(__PREG(Ser2HSCR2), 0x04);
953 release_mem_region(__PREG(Ser2HSCR0), 0x1c);
954 release_mem_region(__PREG(Ser2UTCR0), 0x24);
961 * Suspend the IrDA interface.
963 static int sa1100_irda_suspend(struct platform_device *pdev, pm_message_t state)
965 struct net_device *dev = platform_get_drvdata(pdev);
966 struct sa1100_irda *si;
971 si = netdev_priv(dev);
974 * Stop the transmit queue
976 netif_device_detach(dev);
977 disable_irq(dev->irq);
978 sa1100_irda_shutdown(si);
979 __sa1100_irda_set_power(si, 0);
986 * Resume the IrDA interface.
988 static int sa1100_irda_resume(struct platform_device *pdev)
990 struct net_device *dev = platform_get_drvdata(pdev);
991 struct sa1100_irda *si;
996 si = netdev_priv(dev);
999 * If we missed a speed change, initialise at the new speed
1000 * directly. It is debatable whether this is actually
1001 * required, but in the interests of continuing from where
1002 * we left off it is desirable. The converse argument is
1003 * that we should re-negotiate at 9600 baud again.
1006 si->speed = si->newspeed;
1010 sa1100_irda_startup(si);
1011 __sa1100_irda_set_power(si, si->power);
1012 enable_irq(dev->irq);
1015 * This automatically wakes up the queue
1017 netif_device_attach(dev);
1023 #define sa1100_irda_suspend NULL
1024 #define sa1100_irda_resume NULL
1027 static struct platform_driver sa1100ir_driver = {
1028 .probe = sa1100_irda_probe,
1029 .remove = sa1100_irda_remove,
1030 .suspend = sa1100_irda_suspend,
1031 .resume = sa1100_irda_resume,
1033 .name = "sa11x0-ir",
1034 .owner = THIS_MODULE,
1038 static int __init sa1100_irda_init(void)
1041 * Limit power level a sensible range.
1043 if (power_level < 1)
1045 if (power_level > 3)
1048 return platform_driver_register(&sa1100ir_driver);
1051 static void __exit sa1100_irda_exit(void)
1053 platform_driver_unregister(&sa1100ir_driver);
1056 module_init(sa1100_irda_init);
1057 module_exit(sa1100_irda_exit);
1058 module_param(power_level, int, 0);
1059 module_param(tx_lpm, int, 0);
1060 module_param(max_rate, int, 0);
1062 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
1063 MODULE_DESCRIPTION("StrongARM SA1100 IrDA driver");
1064 MODULE_LICENSE("GPL");
1065 MODULE_PARM_DESC(power_level, "IrDA power level, 1 (low) to 3 (high)");
1066 MODULE_PARM_DESC(tx_lpm, "Enable transmitter low power (1.6us) mode");
1067 MODULE_PARM_DESC(max_rate, "Maximum baud rate (4000000, 115200, 57600, 38400, 19200, 9600)");
1068 MODULE_ALIAS("platform:sa11x0-ir");