1 /*****************************************************************************
5 * Description: Irda MosChip USB Dongle Driver
6 * Authors: Lukasz Stelmach <stlman@poczta.fm>
7 * Brian Pugh <bpugh@cs.pdx.edu>
8 * Judy Fischbach <jfisch@cs.pdx.edu>
10 * Based on stir4200 driver, but some things done differently.
11 * Based on earlier driver by Paul Stewart <stewart@parc.com>
13 * Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
14 * Copyright (C) 2001, Dag Brattli <dag@brattli.net>
15 * Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
16 * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
17 * Copyright (C) 2005, Lukasz Stelmach <stlman@poczta.fm>
18 * Copyright (C) 2005, Brian Pugh <bpugh@cs.pdx.edu>
19 * Copyright (C) 2005, Judy Fischbach <jfisch@cs.pdx.edu>
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2 of the License, or
24 * (at your option) any later version.
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 *****************************************************************************/
38 * MCS7780 is a simple USB to IrDA bridge by MosChip. It is neither
39 * compatibile with irda-usb nor with stir4200. Although it is quite
40 * similar to the later as far as general idea of operation is concerned.
41 * That is it requires the software to do all the framing job at SIR speeds.
42 * The hardware does take care of the framing at MIR and FIR speeds.
43 * It supports all speeds from 2400 through 4Mbps
46 #include <linux/module.h>
47 #include <linux/moduleparam.h>
48 #include <linux/config.h>
49 #include <linux/kernel.h>
50 #include <linux/types.h>
51 #include <linux/errno.h>
52 #include <linux/init.h>
53 #include <linux/slab.h>
54 #include <linux/module.h>
55 #include <linux/kref.h>
56 #include <linux/usb.h>
57 #include <linux/device.h>
58 #include <linux/crc32.h>
60 #include <asm/unaligned.h>
61 #include <asm/byteorder.h>
62 #include <asm/uaccess.h>
64 #include <net/irda/irda.h>
65 #include <net/irda/wrapper.h>
66 #include <net/irda/crc.h>
70 #define MCS_VENDOR_ID 0x9710
71 #define MCS_PRODUCT_ID 0x7780
73 static struct usb_device_id mcs_table[] = {
74 /* MosChip Corp., MCS7780 FIR-USB Adapter */
75 {USB_DEVICE(MCS_VENDOR_ID, MCS_PRODUCT_ID)},
79 MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>");
80 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780");
81 MODULE_VERSION("0.3alpha");
82 MODULE_LICENSE("GPL");
84 MODULE_DEVICE_TABLE(usb, mcs_table);
86 static int qos_mtt_bits = 0x07 /* > 1ms */ ;
87 module_param(qos_mtt_bits, int, 0);
88 MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
90 static int receive_mode = 0x1;
91 module_param(receive_mode, int, 0);
92 MODULE_PARM_DESC(receive_mode,
93 "Receive mode of the device (1:fast, 0:slow, default:1)");
95 static int sir_tweak = 1;
96 module_param(sir_tweak, int, 0444);
97 MODULE_PARM_DESC(sir_tweak,
98 "Default pulse width (1:1.6us, 0:3/16 bit, default:1).");
100 static int transceiver_type = MCS_TSC_VISHAY;
101 module_param(transceiver_type, int, 0444);
102 MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h.");
104 static struct usb_driver mcs_driver = {
107 .disconnect = mcs_disconnect,
108 .id_table = mcs_table,
111 /* speed flag selection by direct addressing.
112 addr = (speed >> 8) & 0x0f
114 0x1 57600 0x2 115200 0x4 1152000 0x5 9600
115 0x6 38400 0x9 2400 0xa 576000 0xb 19200
117 4Mbps (or 2400) must be checked separately. Since it also has
118 to be programmed in a different manner that is not a big problem.
120 static __u16 mcs_speed_set[16] = { 0,
134 /* Set given 16 bit register with a 16 bit value. Send control message
135 * to set dongle register. */
136 static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val)
138 struct usb_device *dev = mcs->usbdev;
139 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
140 MCS_WR_RTYPE, val, reg, NULL, 0,
141 msecs_to_jiffies(MCS_CTRL_TIMEOUT));
144 /* Get 16 bit register value. Send contol message to read dongle register. */
145 static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val)
147 struct usb_device *dev = mcs->usbdev;
148 int ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
149 MCS_RD_RTYPE, 0, reg, val, 2,
150 msecs_to_jiffies(MCS_CTRL_TIMEOUT));
155 /* Setup a communication between mcs7780 and TFDU chips. It is described
156 * in more detail in the data sheet. The setup sequence puts the the
157 * vishay tranceiver into high speed mode. It will also receive SIR speed
158 * packets but at reduced sensitivity.
162 static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs)
167 /* mcs_get_reg should read exactly two bytes from the dongle */
168 ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
169 if (unlikely(ret != 2)) {
174 /* The MCS_XCVR_CONF bit puts the transceiver into configuration
175 * mode. The MCS_MODE0 bit must start out high (1) and then
176 * transition to low and the MCS_STFIR and MCS_MODE1 bits must
179 rval |= (MCS_MODE0 | MCS_XCVR_CONF);
182 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
187 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
191 rval &= ~MCS_XCVR_CONF;
192 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
201 /* Setup a communication between mcs7780 and agilent chip. */
202 static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs)
204 IRDA_WARNING("This transceiver type is not supported yet.");
208 /* Setup a communication between mcs7780 and sharp chip. */
209 static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs)
211 IRDA_WARNING("This transceiver type is not supported yet.");
215 /* Common setup for all transceivers */
216 static inline int mcs_setup_transceiver(struct mcs_cb *mcs)
222 msg = "Basic transceiver setup error.";
224 /* read value of MODE Register, set the DRIVER and RESET bits
225 * and write value back out to MODE Register
227 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
228 if(unlikely(ret != 2))
230 rval |= MCS_DRIVER; /* put the mcs7780 into configuration mode. */
231 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
235 rval = 0; /* set min pulse width to 0 initially. */
236 ret = mcs_set_reg(mcs, MCS_MINRXPW_REG, rval);
240 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
241 if(unlikely(ret != 2))
244 rval &= ~MCS_FIR; /* turn off fir mode. */
246 rval |= MCS_SIR16US; /* 1.6us pulse width */
248 rval &= ~MCS_SIR16US; /* 3/16 bit time pulse width */
250 /* make sure ask mode and back to back packets are off. */
251 rval &= ~(MCS_BBTG | MCS_ASK);
253 rval &= ~MCS_SPEED_MASK;
254 rval |= MCS_SPEED_9600; /* make sure initial speed is 9600. */
256 mcs->new_speed = 0; /* new_speed is set to 0 */
257 rval &= ~MCS_PLLPWDN; /* disable power down. */
259 /* make sure device determines direction and that the auto send sip
262 rval |= MCS_DTD | MCS_SIPEN;
264 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
268 msg = "transceiver model specific setup error.";
269 switch (mcs->transceiver_type) {
271 ret = mcs_setup_transceiver_vishay(mcs);
275 ret = mcs_setup_transceiver_sharp(mcs);
278 case MCS_TSC_AGILENT:
279 ret = mcs_setup_transceiver_agilent(mcs);
283 IRDA_WARNING("Unknown transceiver type: %d",
284 mcs->transceiver_type);
290 /* If transceiver is not SHARP, then if receive mode set
291 * on the RXFAST bit in the XCVR Register otherwise unset it
293 if (mcs->transceiver_type != MCS_TSC_SHARP) {
295 ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
296 if (unlikely(ret != 2))
298 if (mcs->receive_mode)
302 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
307 msg = "transceiver reset.";
309 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
310 if (unlikely(ret != 2))
313 /* reset the mcs7780 so all changes take effect. */
315 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
322 IRDA_ERROR("%s", msg);
326 /* Wraps the data in format for SIR */
327 static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf)
331 /* 2: full frame length, including "the length" */
332 wraplen = async_wrap_skb(skb, buf + 2, 4094);
335 buf[0] = wraplen & 0xff;
336 buf[1] = (wraplen >> 8) & 0xff;
341 /* Wraps the data in format for FIR */
342 static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
344 unsigned int len = 0;
345 __u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
347 /* add 2 bytes for length value and 4 bytes for fcs. */
350 /* The mcs7780 requires that the first two bytes are the packet
351 * length in little endian order. Note: the length value includes
352 * the two bytes for the length value itself.
355 buf[1] = (len >> 8) & 0xff;
356 /* copy the data into the tx buffer. */
357 memcpy(buf+2, skb->data, skb->len);
358 /* put the fcs in the last four bytes in little endian order. */
359 buf[len - 4] = fcs & 0xff;
360 buf[len - 3] = (fcs >> 8) & 0xff;
361 buf[len - 2] = (fcs >> 16) & 0xff;
362 buf[len - 1] = (fcs >> 24) & 0xff;
367 /* Wraps the data in format for MIR */
368 static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf)
371 int len = skb->len + 4;
373 fcs = ~(irda_calc_crc16(~fcs, skb->data, skb->len));
374 /* put the total packet length in first. Note: packet length
375 * value includes the two bytes that hold the packet length
379 buf[1] = (len >> 8) & 0xff;
381 memcpy(buf+2, skb->data, skb->len);
382 /* put the fcs in last two bytes in little endian order. */
383 buf[len - 2] = fcs & 0xff;
384 buf[len - 1] = (fcs >> 8) & 0xff;
389 /* Unwrap received packets at MIR speed. A 16 bit crc_ccitt checksum is
390 * used for the fcs. When performed over the entire packet the result
391 * should be GOOD_FCS = 0xf0b8. Hands the unwrapped data off to the IrDA
392 * layer via a sk_buff.
394 static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len)
400 /* Assume that the frames are going to fill a single packet
401 * rather than span multiple packets.
405 if(unlikely(new_len <= 0)) {
406 IRDA_ERROR("%s short frame length %d\n",
407 mcs->netdev->name, new_len);
408 ++mcs->stats.rx_errors;
409 ++mcs->stats.rx_length_errors;
413 fcs = irda_calc_crc16(~fcs, buf, len);
415 if(fcs != GOOD_FCS) {
416 IRDA_ERROR("crc error calc 0x%x len %d\n",
418 mcs->stats.rx_errors++;
419 mcs->stats.rx_crc_errors++;
423 skb = dev_alloc_skb(new_len + 1);
425 ++mcs->stats.rx_dropped;
430 memcpy(skb->data, buf, new_len);
431 skb_put(skb, new_len);
432 skb->mac.raw = skb->data;
433 skb->protocol = htons(ETH_P_IRDA);
434 skb->dev = mcs->netdev;
438 mcs->stats.rx_packets++;
439 mcs->stats.rx_bytes += new_len;
444 /* Unwrap received packets at FIR speed. A 32 bit crc_ccitt checksum is
445 * used for the fcs. Hands the unwrapped data off to the IrDA
446 * layer via a sk_buff.
448 static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len)
454 /* Assume that the frames are going to fill a single packet
455 * rather than span multiple packets. This is most likely a false
460 if(unlikely(new_len <= 0)) {
461 IRDA_ERROR("%s short frame length %d\n",
462 mcs->netdev->name, new_len);
463 ++mcs->stats.rx_errors;
464 ++mcs->stats.rx_length_errors;
468 fcs = ~(crc32_le(~0, buf, new_len));
469 if(fcs != le32_to_cpu(get_unaligned((u32 *)(buf+new_len)))) {
470 IRDA_ERROR("crc error calc 0x%x len %d\n", fcs, new_len);
471 mcs->stats.rx_errors++;
472 mcs->stats.rx_crc_errors++;
476 skb = dev_alloc_skb(new_len + 1);
478 ++mcs->stats.rx_dropped;
483 memcpy(skb->data, buf, new_len);
484 skb_put(skb, new_len);
485 skb->mac.raw = skb->data;
486 skb->protocol = htons(ETH_P_IRDA);
487 skb->dev = mcs->netdev;
491 mcs->stats.rx_packets++;
492 mcs->stats.rx_bytes += new_len;
498 /* Allocates urbs for both receive and transmit.
499 * If alloc fails return error code 0 (fail) otherwise
500 * return error code 1 (success).
502 static inline int mcs_setup_urbs(struct mcs_cb *mcs)
506 mcs->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
510 mcs->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
517 /* Sets up state to be initially outside frame, gets receive urb,
518 * sets status to successful and then submits the urb to start
519 * receiving the data.
521 static inline int mcs_receive_start(struct mcs_cb *mcs)
523 mcs->rx_buff.in_frame = FALSE;
524 mcs->rx_buff.state = OUTSIDE_FRAME;
526 usb_fill_bulk_urb(mcs->rx_urb, mcs->usbdev,
527 usb_rcvbulkpipe(mcs->usbdev, mcs->ep_in),
528 mcs->in_buf, 4096, mcs_receive_irq, mcs);
530 mcs->rx_urb->status = 0;
531 return usb_submit_urb(mcs->rx_urb, GFP_KERNEL);
534 /* Finds the in and out endpoints for the mcs control block */
535 static inline int mcs_find_endpoints(struct mcs_cb *mcs,
536 struct usb_host_endpoint *ep, int epnum)
541 /* If no place to store the endpoints just return */
545 /* cycle through all endpoints, find the first two that are DIR_IN */
546 for (i = 0; i < epnum; i++) {
547 if (ep[i].desc.bEndpointAddress & USB_DIR_IN)
548 mcs->ep_in = ep[i].desc.bEndpointAddress;
550 mcs->ep_out = ep[i].desc.bEndpointAddress;
552 /* MosChip says that the chip has only two bulk
553 * endpoints. Find one for each direction and move on.
555 if ((mcs->ep_in != 0) && (mcs->ep_out != 0)) {
564 static void mcs_speed_work(void *arg)
566 struct mcs_cb *mcs = arg;
567 struct net_device *netdev = mcs->netdev;
569 mcs_speed_change(mcs);
570 netif_wake_queue(netdev);
573 /* Function to change the speed of the mcs7780. Fully supports SIR,
574 * MIR, and FIR speeds.
576 static int mcs_speed_change(struct mcs_cb *mcs)
584 nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f];
587 mcs_get_reg(mcs, MCS_RESV_REG, &rval);
588 } while(cnt++ < 100 && (rval & MCS_IRINTX));
591 IRDA_ERROR("unable to change speed");
596 mcs_get_reg(mcs, MCS_MODE_REG, &rval);
598 /* MINRXPW values recomended by MosChip */
599 if (mcs->new_speed <= 115200) {
602 if ((rst = (mcs->speed > 115200)))
603 mcs_set_reg(mcs, MCS_MINRXPW_REG, 0);
605 } else if (mcs->new_speed <= 1152000) {
608 if ((rst = !(mcs->speed == 576000 || mcs->speed == 1152000)))
609 mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
614 if ((rst = (mcs->speed != 4000000)))
615 mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
619 rval &= ~MCS_SPEED_MASK;
622 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
627 switch (mcs->transceiver_type) {
629 ret = mcs_setup_transceiver_vishay(mcs);
633 ret = mcs_setup_transceiver_sharp(mcs);
636 case MCS_TSC_AGILENT:
637 ret = mcs_setup_transceiver_agilent(mcs);
642 IRDA_WARNING("Unknown transceiver type: %d",
643 mcs->transceiver_type);
648 mcs_get_reg(mcs, MCS_MODE_REG, &rval);
650 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
652 mcs->speed = mcs->new_speed;
658 /* Ioctl calls not supported at this time. Can be an area of future work. */
659 static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
661 /* struct if_irda_req *irq = (struct if_irda_req *)rq; */
662 /* struct mcs_cb *mcs = netdev_priv(netdev); */
673 /* Network device is taken down, done by "ifconfig irda0 down" */
674 static int mcs_net_close(struct net_device *netdev)
677 struct mcs_cb *mcs = netdev_priv(netdev);
679 /* Stop transmit processing */
680 netif_stop_queue(netdev);
682 /* kill and free the receive and transmit URBs */
683 usb_kill_urb(mcs->rx_urb);
684 usb_free_urb(mcs->rx_urb);
685 usb_kill_urb(mcs->tx_urb);
686 usb_free_urb(mcs->tx_urb);
688 /* Stop and remove instance of IrLAP */
690 irlap_close(mcs->irlap);
696 /* Network device is taken up, done by "ifconfig irda0 up" */
697 static int mcs_net_open(struct net_device *netdev)
699 struct mcs_cb *mcs = netdev_priv(netdev);
703 ret = usb_clear_halt(mcs->usbdev,
704 usb_sndbulkpipe(mcs->usbdev, mcs->ep_in));
707 ret = usb_clear_halt(mcs->usbdev,
708 usb_rcvbulkpipe(mcs->usbdev, mcs->ep_out));
712 ret = mcs_setup_transceiver(mcs);
718 /* Initialize for SIR/FIR to copy data directly into skb. */
720 mcs->rx_buff.truesize = IRDA_SKB_MAX_MTU;
721 mcs->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
722 if (!mcs->rx_buff.skb)
725 skb_reserve(mcs->rx_buff.skb, 1);
726 mcs->rx_buff.head = mcs->rx_buff.skb->data;
727 do_gettimeofday(&mcs->rx_time);
730 * Now that everything should be initialized properly,
731 * Open new IrLAP layer instance to take care of us...
732 * Note : will send immediately a speed change...
734 sprintf(hwname, "usb#%d", mcs->usbdev->devnum);
735 mcs->irlap = irlap_open(netdev, &mcs->qos, hwname);
737 IRDA_ERROR("mcs7780: irlap_open failed");
741 if (!mcs_setup_urbs(mcs))
744 ret = mcs_receive_start(mcs);
748 netif_start_queue(netdev);
752 irlap_close(mcs->irlap);
754 kfree_skb(mcs->rx_buff.skb);
760 /* Get device stats for /proc/net/dev and ifconfig */
761 static struct net_device_stats *mcs_net_get_stats(struct net_device *netdev)
763 struct mcs_cb *mcs = netdev_priv(netdev);
767 /* Receive callback function. */
768 static void mcs_receive_irq(struct urb *urb, struct pt_regs *regs)
771 struct mcs_cb *mcs = urb->context;
775 if (!netif_running(mcs->netdev))
781 if (urb->actual_length > 0) {
782 bytes = urb->transfer_buffer;
784 /* MCS returns frames without BOF and EOF
785 * I assume it returns whole frames.
788 if(mcs->speed < 576000) {
789 async_unwrap_char(mcs->netdev, &mcs->stats,
790 &mcs->rx_buff, 0xc0);
792 for (i = 0; i < urb->actual_length; i++)
793 async_unwrap_char(mcs->netdev, &mcs->stats,
794 &mcs->rx_buff, bytes[i]);
796 async_unwrap_char(mcs->netdev, &mcs->stats,
797 &mcs->rx_buff, 0xc1);
800 else if(mcs->speed == 576000 || mcs->speed == 1152000) {
801 mcs_unwrap_mir(mcs, urb->transfer_buffer,
806 mcs_unwrap_fir(mcs, urb->transfer_buffer,
809 mcs->netdev->last_rx = jiffies;
810 do_gettimeofday(&mcs->rx_time);
813 ret = usb_submit_urb(urb, GFP_ATOMIC);
816 /* Transmit callback funtion. */
817 static void mcs_send_irq(struct urb *urb, struct pt_regs *regs)
819 struct mcs_cb *mcs = urb->context;
820 struct net_device *ndev = mcs->netdev;
822 if (unlikely(mcs->new_speed))
823 schedule_work(&mcs->work);
825 netif_wake_queue(ndev);
828 /* Transmit callback funtion. */
829 static int mcs_hard_xmit(struct sk_buff *skb, struct net_device *ndev)
837 if (skb == NULL || ndev == NULL)
840 netif_stop_queue(ndev);
841 mcs = netdev_priv(ndev);
843 spin_lock_irqsave(&mcs->lock, flags);
845 mcs->new_speed = irda_get_next_speed(skb);
846 if (likely(mcs->new_speed == mcs->speed))
850 if(mcs->speed < 576000) {
851 wraplen = mcs_wrap_sir_skb(skb, mcs->out_buf);
854 else if(mcs->speed == 576000 || mcs->speed == 1152000) {
855 wraplen = mcs_wrap_mir_skb(skb, mcs->out_buf);
859 wraplen = mcs_wrap_fir_skb(skb, mcs->out_buf);
861 usb_fill_bulk_urb(mcs->tx_urb, mcs->usbdev,
862 usb_sndbulkpipe(mcs->usbdev, mcs->ep_out),
863 mcs->out_buf, wraplen, mcs_send_irq, mcs);
865 if ((ret = usb_submit_urb(mcs->tx_urb, GFP_ATOMIC))) {
866 IRDA_ERROR("failed tx_urb: %d", ret);
872 mcs->stats.tx_errors++;
873 netif_start_queue(ndev);
876 mcs->stats.tx_packets++;
877 mcs->stats.tx_bytes += skb->len;
881 spin_unlock_irqrestore(&mcs->lock, flags);
886 * This function is called by the USB subsystem for each new device in the
887 * system. Need to verify the device and if it is, then start handling it.
889 static int mcs_probe(struct usb_interface *intf,
890 const struct usb_device_id *id)
892 struct usb_device *udev = interface_to_usbdev(intf);
893 struct net_device *ndev = NULL;
897 ndev = alloc_irdadev(sizeof(*mcs));
901 IRDA_DEBUG(1, "MCS7780 USB-IrDA bridge found at %d.", udev->devnum);
903 /* what is it realy for? */
904 SET_MODULE_OWNER(ndev);
905 SET_NETDEV_DEV(ndev, &intf->dev);
907 ret = usb_reset_configuration(udev);
909 IRDA_ERROR("mcs7780: usb reset configuration failed");
913 mcs = netdev_priv(ndev);
916 spin_lock_init(&mcs->lock);
918 /* Initialize QoS for this device */
919 irda_init_max_qos_capabilies(&mcs->qos);
921 /* That's the Rx capability. */
922 mcs->qos.baud_rate.bits &=
923 IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200
924 | IR_576000 | IR_1152000 | (IR_4000000 << 8);
927 mcs->qos.min_turn_time.bits &= qos_mtt_bits;
928 irda_qos_bits_to_value(&mcs->qos);
930 /* Speed change work initialisation*/
931 INIT_WORK(&mcs->work, mcs_speed_work, mcs);
933 /* Override the network functions we need to use */
934 ndev->hard_start_xmit = mcs_hard_xmit;
935 ndev->open = mcs_net_open;
936 ndev->stop = mcs_net_close;
937 ndev->get_stats = mcs_net_get_stats;
938 ndev->do_ioctl = mcs_net_ioctl;
940 if (!intf->cur_altsetting)
943 ret = mcs_find_endpoints(mcs, intf->cur_altsetting->endpoint,
944 intf->cur_altsetting->desc.bNumEndpoints);
950 ret = register_netdev(ndev);
954 IRDA_DEBUG(1, "IrDA: Registered MosChip MCS7780 device as %s",
957 mcs->transceiver_type = transceiver_type;
958 mcs->sir_tweak = sir_tweak;
959 mcs->receive_mode = receive_mode;
961 usb_set_intfdata(intf, mcs);
971 /* The current device is removed, the USB layer tells us to shut down. */
972 static void mcs_disconnect(struct usb_interface *intf)
974 struct mcs_cb *mcs = usb_get_intfdata(intf);
979 flush_scheduled_work();
981 unregister_netdev(mcs->netdev);
982 free_netdev(mcs->netdev);
984 usb_set_intfdata(intf, NULL);
985 IRDA_DEBUG(0, "MCS7780 now disconnected.");
988 /* Module insertion */
989 static int __init mcs_init(void)
993 /* register this driver with the USB subsystem */
994 result = usb_register(&mcs_driver);
996 IRDA_ERROR("usb_register failed. Error number %d", result);
1000 module_init(mcs_init);
1002 /* Module removal */
1003 static void __exit mcs_exit(void)
1005 /* deregister this driver with the USB subsystem */
1006 usb_deregister(&mcs_driver);
1008 module_exit(mcs_exit);