1 /* SocketCAN driver for Microchip CAN BUS Analyzer Tool
3 * Copyright (C) 2017 Mobica Limited
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published
7 * by the Free Software Foundation; version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
17 * This driver is inspired by the 4.6.2 version of net/can/usb/usb_8dev.c
20 #include <asm/unaligned.h>
21 #include <linux/can.h>
22 #include <linux/can/dev.h>
23 #include <linux/can/error.h>
24 #include <linux/can/led.h>
25 #include <linux/module.h>
26 #include <linux/netdevice.h>
27 #include <linux/signal.h>
28 #include <linux/slab.h>
29 #include <linux/usb.h>
31 /* vendor and product id */
32 #define MCBA_MODULE_NAME "mcba_usb"
33 #define MCBA_VENDOR_ID 0x04d8
34 #define MCBA_PRODUCT_ID 0x0a30
36 /* driver constants */
37 #define MCBA_MAX_RX_URBS 20
38 #define MCBA_MAX_TX_URBS 20
39 #define MCBA_CTX_FREE MCBA_MAX_TX_URBS
41 /* RX buffer must be bigger than msg size since at the
42 * beggining USB messages are stacked.
44 #define MCBA_USB_RX_BUFF_SIZE 64
45 #define MCBA_USB_TX_BUFF_SIZE (sizeof(struct mcba_usb_msg))
47 /* MCBA endpoint numbers */
48 #define MCBA_USB_EP_IN 1
49 #define MCBA_USB_EP_OUT 1
51 /* Microchip command id */
52 #define MBCA_CMD_RECEIVE_MESSAGE 0xE3
53 #define MBCA_CMD_I_AM_ALIVE_FROM_CAN 0xF5
54 #define MBCA_CMD_I_AM_ALIVE_FROM_USB 0xF7
55 #define MBCA_CMD_CHANGE_BIT_RATE 0xA1
56 #define MBCA_CMD_TRANSMIT_MESSAGE_EV 0xA3
57 #define MBCA_CMD_SETUP_TERMINATION_RESISTANCE 0xA8
58 #define MBCA_CMD_READ_FW_VERSION 0xA9
59 #define MBCA_CMD_NOTHING_TO_SEND 0xFF
60 #define MBCA_CMD_TRANSMIT_MESSAGE_RSP 0xE2
62 #define MCBA_VER_REQ_USB 1
63 #define MCBA_VER_REQ_CAN 2
65 #define MCBA_SIDL_EXID_MASK 0x8
66 #define MCBA_DLC_MASK 0xf
67 #define MCBA_DLC_RTR_MASK 0x40
69 #define MCBA_CAN_STATE_WRN_TH 95
70 #define MCBA_CAN_STATE_ERR_PSV_TH 127
72 #define MCBA_TERMINATION_DISABLED CAN_TERMINATION_DISABLED
73 #define MCBA_TERMINATION_ENABLED 120
76 struct mcba_priv *priv;
82 /* Structure to hold all of our device specific stuff */
84 struct can_priv can; /* must be the first member */
85 struct sk_buff *echo_skb[MCBA_MAX_TX_URBS];
86 struct mcba_usb_ctx tx_context[MCBA_MAX_TX_URBS];
87 struct usb_device *udev;
88 struct net_device *netdev;
89 struct usb_anchor tx_submitted;
90 struct usb_anchor rx_submitted;
91 struct can_berr_counter bec;
92 bool usb_ka_first_pass;
93 bool can_ka_first_pass;
95 atomic_t free_ctx_cnt;
99 struct __packed mcba_usb_msg_can {
110 struct __packed mcba_usb_msg {
115 struct __packed mcba_usb_msg_ka_usb {
117 u8 termination_state;
123 struct __packed mcba_usb_msg_ka_can {
140 struct __packed mcba_usb_msg_change_bitrate {
146 struct __packed mcba_usb_msg_termination {
152 struct __packed mcba_usb_msg_fw_ver {
158 static const struct usb_device_id mcba_usb_table[] = {
159 { USB_DEVICE(MCBA_VENDOR_ID, MCBA_PRODUCT_ID) },
160 {} /* Terminating entry */
163 MODULE_DEVICE_TABLE(usb, mcba_usb_table);
165 static const u16 mcba_termination[] = { MCBA_TERMINATION_DISABLED,
166 MCBA_TERMINATION_ENABLED };
168 static const u32 mcba_bitrate[] = { 20000, 33333, 50000, 80000, 83333,
169 100000, 125000, 150000, 175000, 200000,
170 225000, 250000, 275000, 300000, 500000,
171 625000, 800000, 1000000 };
173 static inline void mcba_init_ctx(struct mcba_priv *priv)
177 for (i = 0; i < MCBA_MAX_TX_URBS; i++) {
178 priv->tx_context[i].ndx = MCBA_CTX_FREE;
179 priv->tx_context[i].priv = priv;
182 atomic_set(&priv->free_ctx_cnt, ARRAY_SIZE(priv->tx_context));
185 static inline struct mcba_usb_ctx *mcba_usb_get_free_ctx(struct mcba_priv *priv,
186 struct can_frame *cf)
189 struct mcba_usb_ctx *ctx = NULL;
191 for (i = 0; i < MCBA_MAX_TX_URBS; i++) {
192 if (priv->tx_context[i].ndx == MCBA_CTX_FREE) {
193 ctx = &priv->tx_context[i];
198 ctx->dlc = cf->can_dlc;
204 atomic_dec(&priv->free_ctx_cnt);
209 if (!atomic_read(&priv->free_ctx_cnt))
210 /* That was the last free ctx. Slow down tx path */
211 netif_stop_queue(priv->netdev);
216 /* mcba_usb_free_ctx and mcba_usb_get_free_ctx are executed by different
217 * threads. The order of execution in below function is important.
219 static inline void mcba_usb_free_ctx(struct mcba_usb_ctx *ctx)
221 /* Increase number of free ctxs before freeing ctx */
222 atomic_inc(&ctx->priv->free_ctx_cnt);
224 ctx->ndx = MCBA_CTX_FREE;
226 /* Wake up the queue once ctx is marked free */
227 netif_wake_queue(ctx->priv->netdev);
230 static void mcba_usb_write_bulk_callback(struct urb *urb)
232 struct mcba_usb_ctx *ctx = urb->context;
233 struct net_device *netdev;
237 netdev = ctx->priv->netdev;
239 /* free up our allocated buffer */
240 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
241 urb->transfer_buffer, urb->transfer_dma);
244 if (!netif_device_present(netdev))
247 netdev->stats.tx_packets++;
248 netdev->stats.tx_bytes += ctx->dlc;
250 can_led_event(netdev, CAN_LED_EVENT_TX);
251 can_get_echo_skb(netdev, ctx->ndx);
255 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
257 /* Release the context */
258 mcba_usb_free_ctx(ctx);
261 /* Send data to device */
262 static netdev_tx_t mcba_usb_xmit(struct mcba_priv *priv,
263 struct mcba_usb_msg *usb_msg,
264 struct mcba_usb_ctx *ctx)
270 /* create a URB, and a buffer for it, and copy the data to the URB */
271 urb = usb_alloc_urb(0, GFP_ATOMIC);
275 buf = usb_alloc_coherent(priv->udev, MCBA_USB_TX_BUFF_SIZE, GFP_ATOMIC,
282 memcpy(buf, usb_msg, MCBA_USB_TX_BUFF_SIZE);
284 usb_fill_bulk_urb(urb, priv->udev,
285 usb_sndbulkpipe(priv->udev, MCBA_USB_EP_OUT), buf,
286 MCBA_USB_TX_BUFF_SIZE, mcba_usb_write_bulk_callback,
289 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
290 usb_anchor_urb(urb, &priv->tx_submitted);
292 err = usb_submit_urb(urb, GFP_ATOMIC);
296 /* Release our reference to this URB, the USB core will eventually free
304 usb_unanchor_urb(urb);
305 usb_free_coherent(priv->udev, MCBA_USB_TX_BUFF_SIZE, buf,
309 netif_device_detach(priv->netdev);
311 netdev_warn(priv->netdev, "failed tx_urb %d\n", err);
319 /* Send data to device */
320 static netdev_tx_t mcba_usb_start_xmit(struct sk_buff *skb,
321 struct net_device *netdev)
323 struct mcba_priv *priv = netdev_priv(netdev);
324 struct can_frame *cf = (struct can_frame *)skb->data;
325 struct mcba_usb_ctx *ctx = NULL;
326 struct net_device_stats *stats = &priv->netdev->stats;
329 struct mcba_usb_msg_can usb_msg = {
330 .cmd_id = MBCA_CMD_TRANSMIT_MESSAGE_EV
333 if (can_dropped_invalid_skb(netdev, skb))
336 ctx = mcba_usb_get_free_ctx(priv, cf);
338 return NETDEV_TX_BUSY;
340 can_put_echo_skb(skb, priv->netdev, ctx->ndx);
342 if (cf->can_id & CAN_EFF_FLAG) {
343 /* SIDH | SIDL | EIDH | EIDL
344 * 28 - 21 | 20 19 18 x x x 17 16 | 15 - 8 | 7 - 0
346 sid = MCBA_SIDL_EXID_MASK;
347 /* store 28-18 bits */
348 sid |= (cf->can_id & 0x1ffc0000) >> 13;
349 /* store 17-16 bits */
350 sid |= (cf->can_id & 0x30000) >> 16;
351 put_unaligned_be16(sid, &usb_msg.sid);
353 /* store 15-0 bits */
354 put_unaligned_be16(cf->can_id & 0xffff, &usb_msg.eid);
357 * 10 - 3 | 2 1 0 x x x x x
359 put_unaligned_be16((cf->can_id & CAN_SFF_MASK) << 5,
364 usb_msg.dlc = cf->can_dlc;
366 memcpy(usb_msg.data, cf->data, usb_msg.dlc);
368 if (cf->can_id & CAN_RTR_FLAG)
369 usb_msg.dlc |= MCBA_DLC_RTR_MASK;
371 err = mcba_usb_xmit(priv, (struct mcba_usb_msg *)&usb_msg, ctx);
378 can_free_echo_skb(priv->netdev, ctx->ndx);
379 mcba_usb_free_ctx(ctx);
386 /* Send cmd to device */
387 static void mcba_usb_xmit_cmd(struct mcba_priv *priv,
388 struct mcba_usb_msg *usb_msg)
390 struct mcba_usb_ctx *ctx = NULL;
393 ctx = mcba_usb_get_free_ctx(priv, NULL);
395 netdev_err(priv->netdev,
396 "Lack of free ctx. Sending (%d) cmd aborted",
402 err = mcba_usb_xmit(priv, usb_msg, ctx);
404 netdev_err(priv->netdev, "Failed to send cmd (%d)",
408 static void mcba_usb_xmit_change_bitrate(struct mcba_priv *priv, u16 bitrate)
410 struct mcba_usb_msg_change_bitrate usb_msg = {
411 .cmd_id = MBCA_CMD_CHANGE_BIT_RATE
414 put_unaligned_be16(bitrate, &usb_msg.bitrate);
416 mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
419 static void mcba_usb_xmit_read_fw_ver(struct mcba_priv *priv, u8 pic)
421 struct mcba_usb_msg_fw_ver usb_msg = {
422 .cmd_id = MBCA_CMD_READ_FW_VERSION,
426 mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
429 static void mcba_usb_process_can(struct mcba_priv *priv,
430 struct mcba_usb_msg_can *msg)
432 struct can_frame *cf;
434 struct net_device_stats *stats = &priv->netdev->stats;
437 skb = alloc_can_skb(priv->netdev, &cf);
441 sid = get_unaligned_be16(&msg->sid);
443 if (sid & MCBA_SIDL_EXID_MASK) {
444 /* SIDH | SIDL | EIDH | EIDL
445 * 28 - 21 | 20 19 18 x x x 17 16 | 15 - 8 | 7 - 0
447 cf->can_id = CAN_EFF_FLAG;
449 /* store 28-18 bits */
450 cf->can_id |= (sid & 0xffe0) << 13;
451 /* store 17-16 bits */
452 cf->can_id |= (sid & 3) << 16;
453 /* store 15-0 bits */
454 cf->can_id |= get_unaligned_be16(&msg->eid);
457 * 10 - 3 | 2 1 0 x x x x x
459 cf->can_id = (sid & 0xffe0) >> 5;
462 if (msg->dlc & MCBA_DLC_RTR_MASK)
463 cf->can_id |= CAN_RTR_FLAG;
465 cf->can_dlc = get_can_dlc(msg->dlc & MCBA_DLC_MASK);
467 memcpy(cf->data, msg->data, cf->can_dlc);
470 stats->rx_bytes += cf->can_dlc;
472 can_led_event(priv->netdev, CAN_LED_EVENT_RX);
476 static void mcba_usb_process_ka_usb(struct mcba_priv *priv,
477 struct mcba_usb_msg_ka_usb *msg)
479 if (unlikely(priv->usb_ka_first_pass)) {
480 netdev_info(priv->netdev, "PIC USB version %hhu.%hhu\n",
481 msg->soft_ver_major, msg->soft_ver_minor);
483 priv->usb_ka_first_pass = false;
486 if (msg->termination_state)
487 priv->can.termination = MCBA_TERMINATION_ENABLED;
489 priv->can.termination = MCBA_TERMINATION_DISABLED;
492 static u32 convert_can2host_bitrate(struct mcba_usb_msg_ka_can *msg)
494 const u32 bitrate = get_unaligned_be16(&msg->can_bitrate);
496 if ((bitrate == 33) || (bitrate == 83))
497 return bitrate * 1000 + 333;
499 return bitrate * 1000;
502 static void mcba_usb_process_ka_can(struct mcba_priv *priv,
503 struct mcba_usb_msg_ka_can *msg)
505 if (unlikely(priv->can_ka_first_pass)) {
506 netdev_info(priv->netdev, "PIC CAN version %hhu.%hhu\n",
507 msg->soft_ver_major, msg->soft_ver_minor);
509 priv->can_ka_first_pass = false;
512 if (unlikely(priv->can_speed_check)) {
513 const u32 bitrate = convert_can2host_bitrate(msg);
515 priv->can_speed_check = false;
517 if (bitrate != priv->can.bittiming.bitrate)
520 "Wrong bitrate reported by the device (%u). Expected %u",
521 bitrate, priv->can.bittiming.bitrate);
524 priv->bec.txerr = msg->tx_err_cnt;
525 priv->bec.rxerr = msg->rx_err_cnt;
528 priv->can.state = CAN_STATE_BUS_OFF;
530 else if ((priv->bec.txerr > MCBA_CAN_STATE_ERR_PSV_TH) ||
531 (priv->bec.rxerr > MCBA_CAN_STATE_ERR_PSV_TH))
532 priv->can.state = CAN_STATE_ERROR_PASSIVE;
534 else if ((priv->bec.txerr > MCBA_CAN_STATE_WRN_TH) ||
535 (priv->bec.rxerr > MCBA_CAN_STATE_WRN_TH))
536 priv->can.state = CAN_STATE_ERROR_WARNING;
539 static void mcba_usb_process_rx(struct mcba_priv *priv,
540 struct mcba_usb_msg *msg)
542 switch (msg->cmd_id) {
543 case MBCA_CMD_I_AM_ALIVE_FROM_CAN:
544 mcba_usb_process_ka_can(priv,
545 (struct mcba_usb_msg_ka_can *)msg);
548 case MBCA_CMD_I_AM_ALIVE_FROM_USB:
549 mcba_usb_process_ka_usb(priv,
550 (struct mcba_usb_msg_ka_usb *)msg);
553 case MBCA_CMD_RECEIVE_MESSAGE:
554 mcba_usb_process_can(priv, (struct mcba_usb_msg_can *)msg);
557 case MBCA_CMD_NOTHING_TO_SEND:
558 /* Side effect of communication between PIC_USB and PIC_CAN.
559 * PIC_CAN is telling us that it has nothing to send
563 case MBCA_CMD_TRANSMIT_MESSAGE_RSP:
564 /* Transmission response from the device containing timestamp */
568 netdev_warn(priv->netdev, "Unsupported msg (0x%hhX)",
574 /* Callback for reading data from device
576 * Check urb status, call read function and resubmit urb read operation.
578 static void mcba_usb_read_bulk_callback(struct urb *urb)
580 struct mcba_priv *priv = urb->context;
581 struct net_device *netdev;
585 netdev = priv->netdev;
587 if (!netif_device_present(netdev))
590 switch (urb->status) {
591 case 0: /* success */
599 netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status);
604 while (pos < urb->actual_length) {
605 struct mcba_usb_msg *msg;
607 if (pos + sizeof(struct mcba_usb_msg) > urb->actual_length) {
608 netdev_err(priv->netdev, "format error\n");
612 msg = (struct mcba_usb_msg *)(urb->transfer_buffer + pos);
613 mcba_usb_process_rx(priv, msg);
615 pos += sizeof(struct mcba_usb_msg);
620 usb_fill_bulk_urb(urb, priv->udev,
621 usb_rcvbulkpipe(priv->udev, MCBA_USB_EP_OUT),
622 urb->transfer_buffer, MCBA_USB_RX_BUFF_SIZE,
623 mcba_usb_read_bulk_callback, priv);
625 retval = usb_submit_urb(urb, GFP_ATOMIC);
627 if (retval == -ENODEV)
628 netif_device_detach(netdev);
630 netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
634 /* Start USB device */
635 static int mcba_usb_start(struct mcba_priv *priv)
637 struct net_device *netdev = priv->netdev;
642 for (i = 0; i < MCBA_MAX_RX_URBS; i++) {
643 struct urb *urb = NULL;
646 /* create a URB, and a buffer for it */
647 urb = usb_alloc_urb(0, GFP_KERNEL);
653 buf = usb_alloc_coherent(priv->udev, MCBA_USB_RX_BUFF_SIZE,
654 GFP_KERNEL, &urb->transfer_dma);
656 netdev_err(netdev, "No memory left for USB buffer\n");
662 usb_fill_bulk_urb(urb, priv->udev,
663 usb_rcvbulkpipe(priv->udev, MCBA_USB_EP_IN),
664 buf, MCBA_USB_RX_BUFF_SIZE,
665 mcba_usb_read_bulk_callback, priv);
666 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
667 usb_anchor_urb(urb, &priv->rx_submitted);
669 err = usb_submit_urb(urb, GFP_KERNEL);
671 usb_unanchor_urb(urb);
672 usb_free_coherent(priv->udev, MCBA_USB_RX_BUFF_SIZE,
673 buf, urb->transfer_dma);
678 /* Drop reference, USB core will take care of freeing it */
682 /* Did we submit any URBs */
684 netdev_warn(netdev, "couldn't setup read URBs\n");
688 /* Warn if we've couldn't transmit all the URBs */
689 if (i < MCBA_MAX_RX_URBS)
690 netdev_warn(netdev, "rx performance may be slow\n");
692 mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_USB);
693 mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_CAN);
698 /* Open USB device */
699 static int mcba_usb_open(struct net_device *netdev)
701 struct mcba_priv *priv = netdev_priv(netdev);
705 err = open_candev(netdev);
709 priv->can_speed_check = true;
710 priv->can.state = CAN_STATE_ERROR_ACTIVE;
712 can_led_event(netdev, CAN_LED_EVENT_OPEN);
713 netif_start_queue(netdev);
718 static void mcba_urb_unlink(struct mcba_priv *priv)
720 usb_kill_anchored_urbs(&priv->rx_submitted);
721 usb_kill_anchored_urbs(&priv->tx_submitted);
724 /* Close USB device */
725 static int mcba_usb_close(struct net_device *netdev)
727 struct mcba_priv *priv = netdev_priv(netdev);
729 priv->can.state = CAN_STATE_STOPPED;
731 netif_stop_queue(netdev);
734 mcba_urb_unlink(priv);
736 close_candev(netdev);
737 can_led_event(netdev, CAN_LED_EVENT_STOP);
742 /* Set network device mode
744 * Maybe we should leave this function empty, because the device
745 * set mode variable with open command.
747 static int mcba_net_set_mode(struct net_device *netdev, enum can_mode mode)
752 static int mcba_net_get_berr_counter(const struct net_device *netdev,
753 struct can_berr_counter *bec)
755 struct mcba_priv *priv = netdev_priv(netdev);
757 bec->txerr = priv->bec.txerr;
758 bec->rxerr = priv->bec.rxerr;
763 static const struct net_device_ops mcba_netdev_ops = {
764 .ndo_open = mcba_usb_open,
765 .ndo_stop = mcba_usb_close,
766 .ndo_start_xmit = mcba_usb_start_xmit,
769 /* Microchip CANBUS has hardcoded bittiming values by default.
770 * This function sends request via USB to change the speed and align bittiming
771 * values for presentation purposes only
773 static int mcba_net_set_bittiming(struct net_device *netdev)
775 struct mcba_priv *priv = netdev_priv(netdev);
776 const u16 bitrate_kbps = priv->can.bittiming.bitrate / 1000;
778 mcba_usb_xmit_change_bitrate(priv, bitrate_kbps);
783 static int mcba_set_termination(struct net_device *netdev, u16 term)
785 struct mcba_priv *priv = netdev_priv(netdev);
786 struct mcba_usb_msg_termination usb_msg = {
787 .cmd_id = MBCA_CMD_SETUP_TERMINATION_RESISTANCE
790 if (term == MCBA_TERMINATION_ENABLED)
791 usb_msg.termination = 1;
793 usb_msg.termination = 0;
795 mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
800 static int mcba_usb_probe(struct usb_interface *intf,
801 const struct usb_device_id *id)
803 struct net_device *netdev;
804 struct mcba_priv *priv;
806 struct usb_device *usbdev = interface_to_usbdev(intf);
808 netdev = alloc_candev(sizeof(struct mcba_priv), MCBA_MAX_TX_URBS);
810 dev_err(&intf->dev, "Couldn't alloc candev\n");
814 priv = netdev_priv(netdev);
817 priv->netdev = netdev;
818 priv->usb_ka_first_pass = true;
819 priv->can_ka_first_pass = true;
820 priv->can_speed_check = false;
822 init_usb_anchor(&priv->rx_submitted);
823 init_usb_anchor(&priv->tx_submitted);
825 usb_set_intfdata(intf, priv);
827 /* Init CAN device */
828 priv->can.state = CAN_STATE_STOPPED;
829 priv->can.termination_const = mcba_termination;
830 priv->can.termination_const_cnt = ARRAY_SIZE(mcba_termination);
831 priv->can.bitrate_const = mcba_bitrate;
832 priv->can.bitrate_const_cnt = ARRAY_SIZE(mcba_bitrate);
834 priv->can.do_set_termination = mcba_set_termination;
835 priv->can.do_set_mode = mcba_net_set_mode;
836 priv->can.do_get_berr_counter = mcba_net_get_berr_counter;
837 priv->can.do_set_bittiming = mcba_net_set_bittiming;
839 netdev->netdev_ops = &mcba_netdev_ops;
841 netdev->flags |= IFF_ECHO; /* we support local echo */
843 SET_NETDEV_DEV(netdev, &intf->dev);
845 err = register_candev(netdev);
847 netdev_err(netdev, "couldn't register CAN device: %d\n", err);
849 goto cleanup_free_candev;
852 devm_can_led_init(netdev);
854 /* Start USB dev only if we have successfully registered CAN device */
855 err = mcba_usb_start(priv);
858 netif_device_detach(priv->netdev);
860 netdev_warn(netdev, "couldn't start device: %d\n", err);
862 goto cleanup_unregister_candev;
865 dev_info(&intf->dev, "Microchip CAN BUS analizer connected\n");
869 cleanup_unregister_candev:
870 unregister_candev(priv->netdev);
878 /* Called by the usb core when driver is unloaded or device is removed */
879 static void mcba_usb_disconnect(struct usb_interface *intf)
881 struct mcba_priv *priv = usb_get_intfdata(intf);
883 usb_set_intfdata(intf, NULL);
885 netdev_info(priv->netdev, "device disconnected\n");
887 unregister_candev(priv->netdev);
888 free_candev(priv->netdev);
890 mcba_urb_unlink(priv);
893 static struct usb_driver mcba_usb_driver = {
894 .name = MCBA_MODULE_NAME,
895 .probe = mcba_usb_probe,
896 .disconnect = mcba_usb_disconnect,
897 .id_table = mcba_usb_table,
900 module_usb_driver(mcba_usb_driver);
902 MODULE_AUTHOR("Remigiusz Kołłątaj <remigiusz.kollataj@mobica.com>");
903 MODULE_DESCRIPTION("SocketCAN driver for Microchip CAN BUS Analyzer Tool");
904 MODULE_LICENSE("GPL v2");