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/kernel.h>
49 #include <linux/types.h>
50 #include <linux/errno.h>
51 #include <linux/slab.h>
52 #include <linux/usb.h>
53 #include <linux/device.h>
54 #include <linux/crc32.h>
56 #include <asm/unaligned.h>
57 #include <asm/byteorder.h>
58 #include <asm/uaccess.h>
60 #include <net/irda/irda.h>
61 #include <net/irda/wrapper.h>
62 #include <net/irda/crc.h>
66 #define MCS_VENDOR_ID 0x9710
67 #define MCS_PRODUCT_ID 0x7780
69 static struct usb_device_id mcs_table[] = {
70 /* MosChip Corp., MCS7780 FIR-USB Adapter */
71 {USB_DEVICE(MCS_VENDOR_ID, MCS_PRODUCT_ID)},
75 MODULE_AUTHOR("Brian Pugh <bpugh@cs.pdx.edu>");
76 MODULE_DESCRIPTION("IrDA-USB Dongle Driver for MosChip MCS7780");
77 MODULE_VERSION("0.3alpha");
78 MODULE_LICENSE("GPL");
80 MODULE_DEVICE_TABLE(usb, mcs_table);
82 static int qos_mtt_bits = 0x07 /* > 1ms */ ;
83 module_param(qos_mtt_bits, int, 0);
84 MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
86 static int receive_mode = 0x1;
87 module_param(receive_mode, int, 0);
88 MODULE_PARM_DESC(receive_mode,
89 "Receive mode of the device (1:fast, 0:slow, default:1)");
91 static int sir_tweak = 1;
92 module_param(sir_tweak, int, 0444);
93 MODULE_PARM_DESC(sir_tweak,
94 "Default pulse width (1:1.6us, 0:3/16 bit, default:1).");
96 static int transceiver_type = MCS_TSC_VISHAY;
97 module_param(transceiver_type, int, 0444);
98 MODULE_PARM_DESC(transceiver_type, "IR transceiver type, see mcs7780.h.");
100 static struct usb_driver mcs_driver = {
103 .disconnect = mcs_disconnect,
104 .id_table = mcs_table,
107 /* speed flag selection by direct addressing.
108 addr = (speed >> 8) & 0x0f
110 0x1 57600 0x2 115200 0x4 1152000 0x5 9600
111 0x6 38400 0x9 2400 0xa 576000 0xb 19200
113 4Mbps (or 2400) must be checked separately. Since it also has
114 to be programmed in a different manner that is not a big problem.
116 static __u16 mcs_speed_set[16] = { 0,
130 /* Set given 16 bit register with a 16 bit value. Send control message
131 * to set dongle register. */
132 static int mcs_set_reg(struct mcs_cb *mcs, __u16 reg, __u16 val)
134 struct usb_device *dev = mcs->usbdev;
135 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
136 MCS_WR_RTYPE, val, reg, NULL, 0,
137 msecs_to_jiffies(MCS_CTRL_TIMEOUT));
140 /* Get 16 bit register value. Send contol message to read dongle register. */
141 static int mcs_get_reg(struct mcs_cb *mcs, __u16 reg, __u16 * val)
143 struct usb_device *dev = mcs->usbdev;
144 int ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
145 MCS_RD_RTYPE, 0, reg, val, 2,
146 msecs_to_jiffies(MCS_CTRL_TIMEOUT));
151 /* Setup a communication between mcs7780 and TFDU chips. It is described
152 * in more detail in the data sheet. The setup sequence puts the the
153 * vishay tranceiver into high speed mode. It will also receive SIR speed
154 * packets but at reduced sensitivity.
158 static inline int mcs_setup_transceiver_vishay(struct mcs_cb *mcs)
163 /* mcs_get_reg should read exactly two bytes from the dongle */
164 ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
165 if (unlikely(ret != 2)) {
170 /* The MCS_XCVR_CONF bit puts the transceiver into configuration
171 * mode. The MCS_MODE0 bit must start out high (1) and then
172 * transition to low and the MCS_STFIR and MCS_MODE1 bits must
175 rval |= (MCS_MODE0 | MCS_XCVR_CONF);
178 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
183 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
187 rval &= ~MCS_XCVR_CONF;
188 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
197 /* Setup a communication between mcs7780 and agilent chip. */
198 static inline int mcs_setup_transceiver_agilent(struct mcs_cb *mcs)
200 IRDA_WARNING("This transceiver type is not supported yet.\n");
204 /* Setup a communication between mcs7780 and sharp chip. */
205 static inline int mcs_setup_transceiver_sharp(struct mcs_cb *mcs)
207 IRDA_WARNING("This transceiver type is not supported yet.\n");
211 /* Common setup for all transceivers */
212 static inline int mcs_setup_transceiver(struct mcs_cb *mcs)
218 msg = "Basic transceiver setup error.";
220 /* read value of MODE Register, set the DRIVER and RESET bits
221 * and write value back out to MODE Register
223 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
224 if(unlikely(ret != 2))
226 rval |= MCS_DRIVER; /* put the mcs7780 into configuration mode. */
227 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
231 rval = 0; /* set min pulse width to 0 initially. */
232 ret = mcs_set_reg(mcs, MCS_MINRXPW_REG, rval);
236 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
237 if(unlikely(ret != 2))
240 rval &= ~MCS_FIR; /* turn off fir mode. */
242 rval |= MCS_SIR16US; /* 1.6us pulse width */
244 rval &= ~MCS_SIR16US; /* 3/16 bit time pulse width */
246 /* make sure ask mode and back to back packets are off. */
247 rval &= ~(MCS_BBTG | MCS_ASK);
249 rval &= ~MCS_SPEED_MASK;
250 rval |= MCS_SPEED_9600; /* make sure initial speed is 9600. */
252 mcs->new_speed = 0; /* new_speed is set to 0 */
253 rval &= ~MCS_PLLPWDN; /* disable power down. */
255 /* make sure device determines direction and that the auto send sip
258 rval |= MCS_DTD | MCS_SIPEN;
260 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
264 msg = "transceiver model specific setup error.";
265 switch (mcs->transceiver_type) {
267 ret = mcs_setup_transceiver_vishay(mcs);
271 ret = mcs_setup_transceiver_sharp(mcs);
274 case MCS_TSC_AGILENT:
275 ret = mcs_setup_transceiver_agilent(mcs);
279 IRDA_WARNING("Unknown transceiver type: %d\n",
280 mcs->transceiver_type);
286 /* If transceiver is not SHARP, then if receive mode set
287 * on the RXFAST bit in the XCVR Register otherwise unset it
289 if (mcs->transceiver_type != MCS_TSC_SHARP) {
291 ret = mcs_get_reg(mcs, MCS_XCVR_REG, &rval);
292 if (unlikely(ret != 2))
294 if (mcs->receive_mode)
298 ret = mcs_set_reg(mcs, MCS_XCVR_REG, rval);
303 msg = "transceiver reset.";
305 ret = mcs_get_reg(mcs, MCS_MODE_REG, &rval);
306 if (unlikely(ret != 2))
309 /* reset the mcs7780 so all changes take effect. */
311 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
318 IRDA_ERROR("%s\n", msg);
322 /* Wraps the data in format for SIR */
323 static inline int mcs_wrap_sir_skb(struct sk_buff *skb, __u8 * buf)
327 /* 2: full frame length, including "the length" */
328 wraplen = async_wrap_skb(skb, buf + 2, 4094);
331 buf[0] = wraplen & 0xff;
332 buf[1] = (wraplen >> 8) & 0xff;
337 /* Wraps the data in format for FIR */
338 static unsigned mcs_wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
340 unsigned int len = 0;
341 __u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
343 /* add 2 bytes for length value and 4 bytes for fcs. */
346 /* The mcs7780 requires that the first two bytes are the packet
347 * length in little endian order. Note: the length value includes
348 * the two bytes for the length value itself.
351 buf[1] = (len >> 8) & 0xff;
352 /* copy the data into the tx buffer. */
353 skb_copy_from_linear_data(skb, buf + 2, skb->len);
354 /* put the fcs in the last four bytes in little endian order. */
355 buf[len - 4] = fcs & 0xff;
356 buf[len - 3] = (fcs >> 8) & 0xff;
357 buf[len - 2] = (fcs >> 16) & 0xff;
358 buf[len - 1] = (fcs >> 24) & 0xff;
363 /* Wraps the data in format for MIR */
364 static unsigned mcs_wrap_mir_skb(const struct sk_buff *skb, __u8 *buf)
367 int len = skb->len + 4;
369 fcs = ~(irda_calc_crc16(~fcs, skb->data, skb->len));
370 /* put the total packet length in first. Note: packet length
371 * value includes the two bytes that hold the packet length
375 buf[1] = (len >> 8) & 0xff;
377 skb_copy_from_linear_data(skb, buf + 2, skb->len);
378 /* put the fcs in last two bytes in little endian order. */
379 buf[len - 2] = fcs & 0xff;
380 buf[len - 1] = (fcs >> 8) & 0xff;
385 /* Unwrap received packets at MIR speed. A 16 bit crc_ccitt checksum is
386 * used for the fcs. When performed over the entire packet the result
387 * should be GOOD_FCS = 0xf0b8. Hands the unwrapped data off to the IrDA
388 * layer via a sk_buff.
390 static void mcs_unwrap_mir(struct mcs_cb *mcs, __u8 *buf, int len)
396 /* Assume that the frames are going to fill a single packet
397 * rather than span multiple packets.
401 if(unlikely(new_len <= 0)) {
402 IRDA_ERROR("%s short frame length %d\n",
403 mcs->netdev->name, new_len);
404 ++mcs->netdev->stats.rx_errors;
405 ++mcs->netdev->stats.rx_length_errors;
409 fcs = irda_calc_crc16(~fcs, buf, len);
411 if(fcs != GOOD_FCS) {
412 IRDA_ERROR("crc error calc 0x%x len %d\n",
414 mcs->netdev->stats.rx_errors++;
415 mcs->netdev->stats.rx_crc_errors++;
419 skb = dev_alloc_skb(new_len + 1);
421 ++mcs->netdev->stats.rx_dropped;
426 skb_copy_to_linear_data(skb, buf, new_len);
427 skb_put(skb, new_len);
428 skb_reset_mac_header(skb);
429 skb->protocol = htons(ETH_P_IRDA);
430 skb->dev = mcs->netdev;
434 mcs->netdev->stats.rx_packets++;
435 mcs->netdev->stats.rx_bytes += new_len;
438 /* Unwrap received packets at FIR speed. A 32 bit crc_ccitt checksum is
439 * used for the fcs. Hands the unwrapped data off to the IrDA
440 * layer via a sk_buff.
442 static void mcs_unwrap_fir(struct mcs_cb *mcs, __u8 *buf, int len)
448 /* Assume that the frames are going to fill a single packet
449 * rather than span multiple packets. This is most likely a false
454 if(unlikely(new_len <= 0)) {
455 IRDA_ERROR("%s short frame length %d\n",
456 mcs->netdev->name, new_len);
457 ++mcs->netdev->stats.rx_errors;
458 ++mcs->netdev->stats.rx_length_errors;
462 fcs = ~(crc32_le(~0, buf, new_len));
463 if(fcs != get_unaligned_le32(buf + new_len)) {
464 IRDA_ERROR("crc error calc 0x%x len %d\n", fcs, new_len);
465 mcs->netdev->stats.rx_errors++;
466 mcs->netdev->stats.rx_crc_errors++;
470 skb = dev_alloc_skb(new_len + 1);
472 ++mcs->netdev->stats.rx_dropped;
477 skb_copy_to_linear_data(skb, buf, new_len);
478 skb_put(skb, new_len);
479 skb_reset_mac_header(skb);
480 skb->protocol = htons(ETH_P_IRDA);
481 skb->dev = mcs->netdev;
485 mcs->netdev->stats.rx_packets++;
486 mcs->netdev->stats.rx_bytes += new_len;
490 /* Allocates urbs for both receive and transmit.
491 * If alloc fails return error code 0 (fail) otherwise
492 * return error code 1 (success).
494 static inline int mcs_setup_urbs(struct mcs_cb *mcs)
498 mcs->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
502 mcs->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
504 usb_free_urb(mcs->tx_urb);
512 /* Sets up state to be initially outside frame, gets receive urb,
513 * sets status to successful and then submits the urb to start
514 * receiving the data.
516 static inline int mcs_receive_start(struct mcs_cb *mcs)
518 mcs->rx_buff.in_frame = FALSE;
519 mcs->rx_buff.state = OUTSIDE_FRAME;
521 usb_fill_bulk_urb(mcs->rx_urb, mcs->usbdev,
522 usb_rcvbulkpipe(mcs->usbdev, mcs->ep_in),
523 mcs->in_buf, 4096, mcs_receive_irq, mcs);
525 mcs->rx_urb->status = 0;
526 return usb_submit_urb(mcs->rx_urb, GFP_KERNEL);
529 /* Finds the in and out endpoints for the mcs control block */
530 static inline int mcs_find_endpoints(struct mcs_cb *mcs,
531 struct usb_host_endpoint *ep, int epnum)
536 /* If no place to store the endpoints just return */
540 /* cycle through all endpoints, find the first two that are DIR_IN */
541 for (i = 0; i < epnum; i++) {
542 if (ep[i].desc.bEndpointAddress & USB_DIR_IN)
543 mcs->ep_in = ep[i].desc.bEndpointAddress;
545 mcs->ep_out = ep[i].desc.bEndpointAddress;
547 /* MosChip says that the chip has only two bulk
548 * endpoints. Find one for each direction and move on.
550 if ((mcs->ep_in != 0) && (mcs->ep_out != 0)) {
559 static void mcs_speed_work(struct work_struct *work)
561 struct mcs_cb *mcs = container_of(work, struct mcs_cb, work);
562 struct net_device *netdev = mcs->netdev;
564 mcs_speed_change(mcs);
565 netif_wake_queue(netdev);
568 /* Function to change the speed of the mcs7780. Fully supports SIR,
569 * MIR, and FIR speeds.
571 static int mcs_speed_change(struct mcs_cb *mcs)
579 nspeed = mcs_speed_set[(mcs->new_speed >> 8) & 0x0f];
582 mcs_get_reg(mcs, MCS_RESV_REG, &rval);
583 } while(cnt++ < 100 && (rval & MCS_IRINTX));
586 IRDA_ERROR("unable to change speed\n");
591 mcs_get_reg(mcs, MCS_MODE_REG, &rval);
593 /* MINRXPW values recommended by MosChip */
594 if (mcs->new_speed <= 115200) {
597 if ((rst = (mcs->speed > 115200)))
598 mcs_set_reg(mcs, MCS_MINRXPW_REG, 0);
600 } else if (mcs->new_speed <= 1152000) {
603 if ((rst = !(mcs->speed == 576000 || mcs->speed == 1152000)))
604 mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
609 if ((rst = (mcs->speed != 4000000)))
610 mcs_set_reg(mcs, MCS_MINRXPW_REG, 5);
614 rval &= ~MCS_SPEED_MASK;
617 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
622 switch (mcs->transceiver_type) {
624 ret = mcs_setup_transceiver_vishay(mcs);
628 ret = mcs_setup_transceiver_sharp(mcs);
631 case MCS_TSC_AGILENT:
632 ret = mcs_setup_transceiver_agilent(mcs);
637 IRDA_WARNING("Unknown transceiver type: %d\n",
638 mcs->transceiver_type);
643 mcs_get_reg(mcs, MCS_MODE_REG, &rval);
645 ret = mcs_set_reg(mcs, MCS_MODE_REG, rval);
647 mcs->speed = mcs->new_speed;
653 /* Ioctl calls not supported at this time. Can be an area of future work. */
654 static int mcs_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
656 /* struct if_irda_req *irq = (struct if_irda_req *)rq; */
657 /* struct mcs_cb *mcs = netdev_priv(netdev); */
668 /* Network device is taken down, done by "ifconfig irda0 down" */
669 static int mcs_net_close(struct net_device *netdev)
672 struct mcs_cb *mcs = netdev_priv(netdev);
674 /* Stop transmit processing */
675 netif_stop_queue(netdev);
677 kfree_skb(mcs->rx_buff.skb);
679 /* kill and free the receive and transmit URBs */
680 usb_kill_urb(mcs->rx_urb);
681 usb_free_urb(mcs->rx_urb);
682 usb_kill_urb(mcs->tx_urb);
683 usb_free_urb(mcs->tx_urb);
685 /* Stop and remove instance of IrLAP */
687 irlap_close(mcs->irlap);
693 /* Network device is taken up, done by "ifconfig irda0 up" */
694 static int mcs_net_open(struct net_device *netdev)
696 struct mcs_cb *mcs = netdev_priv(netdev);
700 ret = usb_clear_halt(mcs->usbdev,
701 usb_sndbulkpipe(mcs->usbdev, mcs->ep_in));
704 ret = usb_clear_halt(mcs->usbdev,
705 usb_rcvbulkpipe(mcs->usbdev, mcs->ep_out));
709 ret = mcs_setup_transceiver(mcs);
715 /* Initialize for SIR/FIR to copy data directly into skb. */
717 mcs->rx_buff.truesize = IRDA_SKB_MAX_MTU;
718 mcs->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
719 if (!mcs->rx_buff.skb)
722 skb_reserve(mcs->rx_buff.skb, 1);
723 mcs->rx_buff.head = mcs->rx_buff.skb->data;
724 do_gettimeofday(&mcs->rx_time);
727 * Now that everything should be initialized properly,
728 * Open new IrLAP layer instance to take care of us...
729 * Note : will send immediately a speed change...
731 sprintf(hwname, "usb#%d", mcs->usbdev->devnum);
732 mcs->irlap = irlap_open(netdev, &mcs->qos, hwname);
734 IRDA_ERROR("mcs7780: irlap_open failed\n");
738 if (!mcs_setup_urbs(mcs))
741 ret = mcs_receive_start(mcs);
745 netif_start_queue(netdev);
749 usb_free_urb(mcs->rx_urb);
750 usb_free_urb(mcs->tx_urb);
752 irlap_close(mcs->irlap);
754 kfree_skb(mcs->rx_buff.skb);
759 /* Receive callback function. */
760 static void mcs_receive_irq(struct urb *urb)
763 struct mcs_cb *mcs = urb->context;
767 if (!netif_running(mcs->netdev))
773 if (urb->actual_length > 0) {
774 bytes = urb->transfer_buffer;
776 /* MCS returns frames without BOF and EOF
777 * I assume it returns whole frames.
780 if(mcs->speed < 576000) {
781 async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
782 &mcs->rx_buff, 0xc0);
784 for (i = 0; i < urb->actual_length; i++)
785 async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
786 &mcs->rx_buff, bytes[i]);
788 async_unwrap_char(mcs->netdev, &mcs->netdev->stats,
789 &mcs->rx_buff, 0xc1);
792 else if(mcs->speed == 576000 || mcs->speed == 1152000) {
793 mcs_unwrap_mir(mcs, urb->transfer_buffer,
798 mcs_unwrap_fir(mcs, urb->transfer_buffer,
801 do_gettimeofday(&mcs->rx_time);
804 ret = usb_submit_urb(urb, GFP_ATOMIC);
807 /* Transmit callback function. */
808 static void mcs_send_irq(struct urb *urb)
810 struct mcs_cb *mcs = urb->context;
811 struct net_device *ndev = mcs->netdev;
813 if (unlikely(mcs->new_speed))
814 schedule_work(&mcs->work);
816 netif_wake_queue(ndev);
819 /* Transmit callback function. */
820 static netdev_tx_t mcs_hard_xmit(struct sk_buff *skb,
821 struct net_device *ndev)
828 netif_stop_queue(ndev);
829 mcs = netdev_priv(ndev);
831 spin_lock_irqsave(&mcs->lock, flags);
833 mcs->new_speed = irda_get_next_speed(skb);
834 if (likely(mcs->new_speed == mcs->speed))
838 if(mcs->speed < 576000) {
839 wraplen = mcs_wrap_sir_skb(skb, mcs->out_buf);
842 else if(mcs->speed == 576000 || mcs->speed == 1152000) {
843 wraplen = mcs_wrap_mir_skb(skb, mcs->out_buf);
847 wraplen = mcs_wrap_fir_skb(skb, mcs->out_buf);
849 usb_fill_bulk_urb(mcs->tx_urb, mcs->usbdev,
850 usb_sndbulkpipe(mcs->usbdev, mcs->ep_out),
851 mcs->out_buf, wraplen, mcs_send_irq, mcs);
853 if ((ret = usb_submit_urb(mcs->tx_urb, GFP_ATOMIC))) {
854 IRDA_ERROR("failed tx_urb: %d\n", ret);
860 mcs->netdev->stats.tx_errors++;
861 netif_start_queue(ndev);
864 mcs->netdev->stats.tx_packets++;
865 mcs->netdev->stats.tx_bytes += skb->len;
869 spin_unlock_irqrestore(&mcs->lock, flags);
873 static const struct net_device_ops mcs_netdev_ops = {
874 .ndo_open = mcs_net_open,
875 .ndo_stop = mcs_net_close,
876 .ndo_start_xmit = mcs_hard_xmit,
877 .ndo_do_ioctl = mcs_net_ioctl,
881 * This function is called by the USB subsystem for each new device in the
882 * system. Need to verify the device and if it is, then start handling it.
884 static int mcs_probe(struct usb_interface *intf,
885 const struct usb_device_id *id)
887 struct usb_device *udev = interface_to_usbdev(intf);
888 struct net_device *ndev = NULL;
892 ndev = alloc_irdadev(sizeof(*mcs));
896 IRDA_DEBUG(1, "MCS7780 USB-IrDA bridge found at %d.\n", udev->devnum);
898 SET_NETDEV_DEV(ndev, &intf->dev);
900 ret = usb_reset_configuration(udev);
902 IRDA_ERROR("mcs7780: usb reset configuration failed\n");
906 mcs = netdev_priv(ndev);
909 spin_lock_init(&mcs->lock);
911 /* Initialize QoS for this device */
912 irda_init_max_qos_capabilies(&mcs->qos);
914 /* That's the Rx capability. */
915 mcs->qos.baud_rate.bits &=
916 IR_2400 | IR_9600 | IR_19200 | IR_38400 | IR_57600 | IR_115200
917 | IR_576000 | IR_1152000 | (IR_4000000 << 8);
920 mcs->qos.min_turn_time.bits &= qos_mtt_bits;
921 irda_qos_bits_to_value(&mcs->qos);
923 /* Speed change work initialisation*/
924 INIT_WORK(&mcs->work, mcs_speed_work);
926 ndev->netdev_ops = &mcs_netdev_ops;
928 if (!intf->cur_altsetting) {
933 ret = mcs_find_endpoints(mcs, intf->cur_altsetting->endpoint,
934 intf->cur_altsetting->desc.bNumEndpoints);
940 ret = register_netdev(ndev);
944 IRDA_DEBUG(1, "IrDA: Registered MosChip MCS7780 device as %s\n",
947 mcs->transceiver_type = transceiver_type;
948 mcs->sir_tweak = sir_tweak;
949 mcs->receive_mode = receive_mode;
951 usb_set_intfdata(intf, mcs);
961 /* The current device is removed, the USB layer tells us to shut down. */
962 static void mcs_disconnect(struct usb_interface *intf)
964 struct mcs_cb *mcs = usb_get_intfdata(intf);
969 cancel_work_sync(&mcs->work);
971 unregister_netdev(mcs->netdev);
972 free_netdev(mcs->netdev);
974 usb_set_intfdata(intf, NULL);
975 IRDA_DEBUG(0, "MCS7780 now disconnected.\n");
978 module_usb_driver(mcs_driver);