1 // SPDX-License-Identifier: GPL-2.0-only
2 /* CAN driver for Geschwister Schneider USB/CAN devices
3 * and bytewerk.org candleLight USB CAN interfaces.
5 * Copyright (C) 2013-2016 Geschwister Schneider Technologie-,
6 * Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
7 * Copyright (C) 2016 Hubert Denkmair
9 * Many thanks to all socketcan devs!
12 #include <linux/bitfield.h>
13 #include <linux/clocksource.h>
14 #include <linux/ethtool.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/netdevice.h>
18 #include <linux/signal.h>
19 #include <linux/timecounter.h>
20 #include <linux/units.h>
21 #include <linux/usb.h>
22 #include <linux/workqueue.h>
24 #include <linux/can.h>
25 #include <linux/can/dev.h>
26 #include <linux/can/error.h>
28 /* Device specific constants */
29 #define USB_GS_USB_1_VENDOR_ID 0x1d50
30 #define USB_GS_USB_1_PRODUCT_ID 0x606f
32 #define USB_CANDLELIGHT_VENDOR_ID 0x1209
33 #define USB_CANDLELIGHT_PRODUCT_ID 0x2323
35 #define USB_CES_CANEXT_FD_VENDOR_ID 0x1cd2
36 #define USB_CES_CANEXT_FD_PRODUCT_ID 0x606f
38 #define USB_ABE_CANDEBUGGER_FD_VENDOR_ID 0x16d0
39 #define USB_ABE_CANDEBUGGER_FD_PRODUCT_ID 0x10b8
41 #define GS_USB_ENDPOINT_IN 1
42 #define GS_USB_ENDPOINT_OUT 2
44 /* Timestamp 32 bit timer runs at 1 MHz (1 µs tick). Worker accounts
45 * for timer overflow (will be after ~71 minutes)
47 #define GS_USB_TIMESTAMP_TIMER_HZ (1 * HZ_PER_MHZ)
48 #define GS_USB_TIMESTAMP_WORK_DELAY_SEC 1800
49 static_assert(GS_USB_TIMESTAMP_WORK_DELAY_SEC <
50 CYCLECOUNTER_MASK(32) / GS_USB_TIMESTAMP_TIMER_HZ / 2);
52 /* Device specific constants */
54 GS_USB_BREQ_HOST_FORMAT = 0,
55 GS_USB_BREQ_BITTIMING,
59 GS_USB_BREQ_DEVICE_CONFIG,
60 GS_USB_BREQ_TIMESTAMP,
62 GS_USB_BREQ_GET_USER_ID,
63 GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING = GS_USB_BREQ_GET_USER_ID,
64 GS_USB_BREQ_SET_USER_ID,
65 GS_USB_BREQ_DATA_BITTIMING,
66 GS_USB_BREQ_BT_CONST_EXT,
67 GS_USB_BREQ_SET_TERMINATION,
68 GS_USB_BREQ_GET_TERMINATION,
69 GS_USB_BREQ_GET_STATE,
73 /* reset a channel. turns it off */
74 GS_CAN_MODE_RESET = 0,
75 /* starts a channel */
80 GS_CAN_STATE_ERROR_ACTIVE = 0,
81 GS_CAN_STATE_ERROR_WARNING,
82 GS_CAN_STATE_ERROR_PASSIVE,
88 enum gs_can_identify_mode {
89 GS_CAN_IDENTIFY_OFF = 0,
93 enum gs_can_termination_state {
94 GS_CAN_TERMINATION_STATE_OFF = 0,
95 GS_CAN_TERMINATION_STATE_ON
98 #define GS_USB_TERMINATION_DISABLED CAN_TERMINATION_DISABLED
99 #define GS_USB_TERMINATION_ENABLED 120
101 /* data types passed between host and device */
103 /* The firmware on the original USB2CAN by Geschwister Schneider
104 * Technologie Entwicklungs- und Vertriebs UG exchanges all data
105 * between the host and the device in host byte order. This is done
106 * with the struct gs_host_config::byte_order member, which is sent
107 * first to indicate the desired byte order.
109 * The widely used open source firmware candleLight doesn't support
110 * this feature and exchanges the data in little endian byte order.
112 struct gs_host_config {
116 struct gs_device_config {
125 #define GS_CAN_MODE_NORMAL 0
126 #define GS_CAN_MODE_LISTEN_ONLY BIT(0)
127 #define GS_CAN_MODE_LOOP_BACK BIT(1)
128 #define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2)
129 #define GS_CAN_MODE_ONE_SHOT BIT(3)
130 #define GS_CAN_MODE_HW_TIMESTAMP BIT(4)
131 /* GS_CAN_FEATURE_IDENTIFY BIT(5) */
132 /* GS_CAN_FEATURE_USER_ID BIT(6) */
133 #define GS_CAN_MODE_PAD_PKTS_TO_MAX_PKT_SIZE BIT(7)
134 #define GS_CAN_MODE_FD BIT(8)
135 /* GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX BIT(9) */
136 /* GS_CAN_FEATURE_BT_CONST_EXT BIT(10) */
137 /* GS_CAN_FEATURE_TERMINATION BIT(11) */
138 #define GS_CAN_MODE_BERR_REPORTING BIT(12)
139 /* GS_CAN_FEATURE_GET_STATE BIT(13) */
141 struct gs_device_mode {
146 struct gs_device_state {
152 struct gs_device_bittiming {
160 struct gs_identify_mode {
164 struct gs_device_termination_state {
168 #define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
169 #define GS_CAN_FEATURE_LOOP_BACK BIT(1)
170 #define GS_CAN_FEATURE_TRIPLE_SAMPLE BIT(2)
171 #define GS_CAN_FEATURE_ONE_SHOT BIT(3)
172 #define GS_CAN_FEATURE_HW_TIMESTAMP BIT(4)
173 #define GS_CAN_FEATURE_IDENTIFY BIT(5)
174 #define GS_CAN_FEATURE_USER_ID BIT(6)
175 #define GS_CAN_FEATURE_PAD_PKTS_TO_MAX_PKT_SIZE BIT(7)
176 #define GS_CAN_FEATURE_FD BIT(8)
177 #define GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX BIT(9)
178 #define GS_CAN_FEATURE_BT_CONST_EXT BIT(10)
179 #define GS_CAN_FEATURE_TERMINATION BIT(11)
180 #define GS_CAN_FEATURE_BERR_REPORTING BIT(12)
181 #define GS_CAN_FEATURE_GET_STATE BIT(13)
182 #define GS_CAN_FEATURE_MASK GENMASK(13, 0)
184 /* internal quirks - keep in GS_CAN_FEATURE space for now */
186 /* CANtact Pro original firmware:
187 * BREQ DATA_BITTIMING overlaps with GET_USER_ID
189 #define GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO BIT(31)
191 struct gs_device_bt_const {
204 struct gs_device_bt_const_extended {
226 #define GS_CAN_FLAG_OVERFLOW BIT(0)
227 #define GS_CAN_FLAG_FD BIT(1)
228 #define GS_CAN_FLAG_BRS BIT(2)
229 #define GS_CAN_FLAG_ESI BIT(3)
235 struct classic_can_ts {
240 struct classic_can_quirk {
259 struct gs_host_frame {
269 DECLARE_FLEX_ARRAY(struct classic_can, classic_can);
270 DECLARE_FLEX_ARRAY(struct classic_can_ts, classic_can_ts);
271 DECLARE_FLEX_ARRAY(struct classic_can_quirk, classic_can_quirk);
272 DECLARE_FLEX_ARRAY(struct canfd, canfd);
273 DECLARE_FLEX_ARRAY(struct canfd_ts, canfd_ts);
274 DECLARE_FLEX_ARRAY(struct canfd_quirk, canfd_quirk);
277 /* The GS USB devices make use of the same flags and masks as in
278 * linux/can.h and linux/can/error.h, and no additional mapping is necessary.
281 /* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
282 #define GS_MAX_TX_URBS 10
283 /* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
284 #define GS_MAX_RX_URBS 30
285 /* Maximum number of interfaces the driver supports per device.
286 * Current hardware only supports 3 interfaces. The future may vary.
288 #define GS_MAX_INTF 3
290 struct gs_tx_context {
292 unsigned int echo_id;
296 struct can_priv can; /* must be the first member */
298 struct gs_usb *parent;
300 struct net_device *netdev;
301 struct usb_device *udev;
303 struct can_bittiming_const bt_const, data_bt_const;
304 unsigned int channel; /* channel number */
307 unsigned int hf_size_tx;
309 /* This lock prevents a race condition between xmit and receive. */
310 spinlock_t tx_ctx_lock;
311 struct gs_tx_context tx_context[GS_MAX_TX_URBS];
313 struct usb_anchor tx_submitted;
314 atomic_t active_tx_urbs;
317 /* usb interface struct */
319 struct gs_can *canch[GS_MAX_INTF];
320 struct usb_anchor rx_submitted;
321 struct usb_device *udev;
323 /* time counter for hardware timestamps */
324 struct cyclecounter cc;
325 struct timecounter tc;
326 spinlock_t tc_lock; /* spinlock to guard access tc->cycle_last */
327 struct delayed_work timestamp;
329 unsigned int hf_size_rx;
333 /* 'allocate' a tx context.
334 * returns a valid tx context or NULL if there is no space.
336 static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
341 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
343 for (; i < GS_MAX_TX_URBS; i++) {
344 if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
345 dev->tx_context[i].echo_id = i;
346 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
347 return &dev->tx_context[i];
351 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
355 /* releases a tx context
357 static void gs_free_tx_context(struct gs_tx_context *txc)
359 txc->echo_id = GS_MAX_TX_URBS;
362 /* Get a tx context by id.
364 static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
369 if (id < GS_MAX_TX_URBS) {
370 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
371 if (dev->tx_context[id].echo_id == id) {
372 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
373 return &dev->tx_context[id];
375 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
380 static int gs_cmd_reset(struct gs_can *dev)
382 struct gs_device_mode dm = {
383 .mode = GS_CAN_MODE_RESET,
386 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_MODE,
387 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
388 dev->channel, 0, &dm, sizeof(dm), 1000,
392 static inline int gs_usb_get_timestamp(const struct gs_usb *parent,
398 rc = usb_control_msg_recv(parent->udev, 0, GS_USB_BREQ_TIMESTAMP,
399 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
401 ×tamp, sizeof(timestamp),
402 USB_CTRL_GET_TIMEOUT,
407 *timestamp_p = le32_to_cpu(timestamp);
412 static u64 gs_usb_timestamp_read(const struct cyclecounter *cc) __must_hold(&dev->tc_lock)
414 struct gs_usb *parent = container_of(cc, struct gs_usb, cc);
418 lockdep_assert_held(&parent->tc_lock);
420 /* drop lock for synchronous USB transfer */
421 spin_unlock_bh(&parent->tc_lock);
422 err = gs_usb_get_timestamp(parent, ×tamp);
423 spin_lock_bh(&parent->tc_lock);
425 dev_err(&parent->udev->dev,
426 "Error %d while reading timestamp. HW timestamps may be inaccurate.",
432 static void gs_usb_timestamp_work(struct work_struct *work)
434 struct delayed_work *delayed_work = to_delayed_work(work);
435 struct gs_usb *parent;
437 parent = container_of(delayed_work, struct gs_usb, timestamp);
438 spin_lock_bh(&parent->tc_lock);
439 timecounter_read(&parent->tc);
440 spin_unlock_bh(&parent->tc_lock);
442 schedule_delayed_work(&parent->timestamp,
443 GS_USB_TIMESTAMP_WORK_DELAY_SEC * HZ);
446 static void gs_usb_skb_set_timestamp(struct gs_can *dev,
447 struct sk_buff *skb, u32 timestamp)
449 struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
450 struct gs_usb *parent = dev->parent;
453 spin_lock_bh(&parent->tc_lock);
454 ns = timecounter_cyc2time(&parent->tc, timestamp);
455 spin_unlock_bh(&parent->tc_lock);
457 hwtstamps->hwtstamp = ns_to_ktime(ns);
460 static void gs_usb_timestamp_init(struct gs_usb *parent)
462 struct cyclecounter *cc = &parent->cc;
464 cc->read = gs_usb_timestamp_read;
465 cc->mask = CYCLECOUNTER_MASK(32);
466 cc->shift = 32 - bits_per(NSEC_PER_SEC / GS_USB_TIMESTAMP_TIMER_HZ);
467 cc->mult = clocksource_hz2mult(GS_USB_TIMESTAMP_TIMER_HZ, cc->shift);
469 spin_lock_init(&parent->tc_lock);
470 spin_lock_bh(&parent->tc_lock);
471 timecounter_init(&parent->tc, &parent->cc, ktime_get_real_ns());
472 spin_unlock_bh(&parent->tc_lock);
474 INIT_DELAYED_WORK(&parent->timestamp, gs_usb_timestamp_work);
475 schedule_delayed_work(&parent->timestamp,
476 GS_USB_TIMESTAMP_WORK_DELAY_SEC * HZ);
479 static void gs_usb_timestamp_stop(struct gs_usb *parent)
481 cancel_delayed_work_sync(&parent->timestamp);
484 static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
486 struct can_device_stats *can_stats = &dev->can.can_stats;
488 if (cf->can_id & CAN_ERR_RESTARTED) {
489 dev->can.state = CAN_STATE_ERROR_ACTIVE;
490 can_stats->restarts++;
491 } else if (cf->can_id & CAN_ERR_BUSOFF) {
492 dev->can.state = CAN_STATE_BUS_OFF;
493 can_stats->bus_off++;
494 } else if (cf->can_id & CAN_ERR_CRTL) {
495 if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
496 (cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
497 dev->can.state = CAN_STATE_ERROR_WARNING;
498 can_stats->error_warning++;
499 } else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
500 (cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
501 dev->can.state = CAN_STATE_ERROR_PASSIVE;
502 can_stats->error_passive++;
504 dev->can.state = CAN_STATE_ERROR_ACTIVE;
509 static void gs_usb_set_timestamp(struct gs_can *dev, struct sk_buff *skb,
510 const struct gs_host_frame *hf)
514 if (!(dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP))
517 if (hf->flags & GS_CAN_FLAG_FD)
518 timestamp = le32_to_cpu(hf->canfd_ts->timestamp_us);
520 timestamp = le32_to_cpu(hf->classic_can_ts->timestamp_us);
522 gs_usb_skb_set_timestamp(dev, skb, timestamp);
525 static void gs_usb_receive_bulk_callback(struct urb *urb)
527 struct gs_usb *usbcan = urb->context;
529 struct net_device *netdev;
531 struct net_device_stats *stats;
532 struct gs_host_frame *hf = urb->transfer_buffer;
533 struct gs_tx_context *txc;
534 struct can_frame *cf;
535 struct canfd_frame *cfd;
540 switch (urb->status) {
541 case 0: /* success */
547 /* do not resubmit aborted urbs. eg: when device goes down */
551 /* device reports out of range channel id */
552 if (hf->channel >= GS_MAX_INTF)
555 dev = usbcan->canch[hf->channel];
557 netdev = dev->netdev;
558 stats = &netdev->stats;
560 if (!netif_device_present(netdev))
563 if (!netif_running(netdev))
566 if (hf->echo_id == -1) { /* normal rx */
567 if (hf->flags & GS_CAN_FLAG_FD) {
568 skb = alloc_canfd_skb(dev->netdev, &cfd);
572 cfd->can_id = le32_to_cpu(hf->can_id);
573 cfd->len = can_fd_dlc2len(hf->can_dlc);
574 if (hf->flags & GS_CAN_FLAG_BRS)
575 cfd->flags |= CANFD_BRS;
576 if (hf->flags & GS_CAN_FLAG_ESI)
577 cfd->flags |= CANFD_ESI;
579 memcpy(cfd->data, hf->canfd->data, cfd->len);
581 skb = alloc_can_skb(dev->netdev, &cf);
585 cf->can_id = le32_to_cpu(hf->can_id);
586 can_frame_set_cc_len(cf, hf->can_dlc, dev->can.ctrlmode);
588 memcpy(cf->data, hf->classic_can->data, 8);
590 /* ERROR frames tell us information about the controller */
591 if (le32_to_cpu(hf->can_id) & CAN_ERR_FLAG)
592 gs_update_state(dev, cf);
595 gs_usb_set_timestamp(dev, skb, hf);
597 netdev->stats.rx_packets++;
598 netdev->stats.rx_bytes += hf->can_dlc;
601 } else { /* echo_id == hf->echo_id */
602 if (hf->echo_id >= GS_MAX_TX_URBS) {
604 "Unexpected out of range echo id %u\n",
609 txc = gs_get_tx_context(dev, hf->echo_id);
611 /* bad devices send bad echo_ids. */
614 "Unexpected unused echo id %u\n",
619 skb = dev->can.echo_skb[hf->echo_id];
620 gs_usb_set_timestamp(dev, skb, hf);
622 netdev->stats.tx_packets++;
623 netdev->stats.tx_bytes += can_get_echo_skb(netdev, hf->echo_id,
626 gs_free_tx_context(txc);
628 atomic_dec(&dev->active_tx_urbs);
630 netif_wake_queue(netdev);
633 if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
634 skb = alloc_can_err_skb(netdev, &cf);
638 cf->can_id |= CAN_ERR_CRTL;
639 cf->len = CAN_ERR_DLC;
640 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
641 stats->rx_over_errors++;
647 usb_fill_bulk_urb(urb, usbcan->udev,
648 usb_rcvbulkpipe(usbcan->udev, GS_USB_ENDPOINT_IN),
649 hf, dev->parent->hf_size_rx,
650 gs_usb_receive_bulk_callback, usbcan);
652 rc = usb_submit_urb(urb, GFP_ATOMIC);
654 /* USB failure take down all interfaces */
657 for (rc = 0; rc < GS_MAX_INTF; rc++) {
658 if (usbcan->canch[rc])
659 netif_device_detach(usbcan->canch[rc]->netdev);
664 static int gs_usb_set_bittiming(struct net_device *netdev)
666 struct gs_can *dev = netdev_priv(netdev);
667 struct can_bittiming *bt = &dev->can.bittiming;
668 struct gs_device_bittiming dbt = {
669 .prop_seg = cpu_to_le32(bt->prop_seg),
670 .phase_seg1 = cpu_to_le32(bt->phase_seg1),
671 .phase_seg2 = cpu_to_le32(bt->phase_seg2),
672 .sjw = cpu_to_le32(bt->sjw),
673 .brp = cpu_to_le32(bt->brp),
676 /* request bit timings */
677 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_BITTIMING,
678 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
679 dev->channel, 0, &dbt, sizeof(dbt), 1000,
683 static int gs_usb_set_data_bittiming(struct net_device *netdev)
685 struct gs_can *dev = netdev_priv(netdev);
686 struct can_bittiming *bt = &dev->can.data_bittiming;
687 struct gs_device_bittiming dbt = {
688 .prop_seg = cpu_to_le32(bt->prop_seg),
689 .phase_seg1 = cpu_to_le32(bt->phase_seg1),
690 .phase_seg2 = cpu_to_le32(bt->phase_seg2),
691 .sjw = cpu_to_le32(bt->sjw),
692 .brp = cpu_to_le32(bt->brp),
694 u8 request = GS_USB_BREQ_DATA_BITTIMING;
696 if (dev->feature & GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO)
697 request = GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING;
699 /* request data bit timings */
700 return usb_control_msg_send(dev->udev, 0, request,
701 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
702 dev->channel, 0, &dbt, sizeof(dbt), 1000,
706 static void gs_usb_xmit_callback(struct urb *urb)
708 struct gs_tx_context *txc = urb->context;
709 struct gs_can *dev = txc->dev;
710 struct net_device *netdev = dev->netdev;
713 netdev_info(netdev, "usb xmit fail %u\n", txc->echo_id);
716 static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
717 struct net_device *netdev)
719 struct gs_can *dev = netdev_priv(netdev);
720 struct net_device_stats *stats = &dev->netdev->stats;
722 struct gs_host_frame *hf;
723 struct can_frame *cf;
724 struct canfd_frame *cfd;
727 struct gs_tx_context *txc;
729 if (can_dev_dropped_skb(netdev, skb))
732 /* find an empty context to keep track of transmission */
733 txc = gs_alloc_tx_context(dev);
735 return NETDEV_TX_BUSY;
737 /* create a URB, and a buffer for it */
738 urb = usb_alloc_urb(0, GFP_ATOMIC);
742 hf = kmalloc(dev->hf_size_tx, GFP_ATOMIC);
744 netdev_err(netdev, "No memory left for USB buffer\n");
750 if (idx >= GS_MAX_TX_URBS) {
751 netdev_err(netdev, "Invalid tx context %u\n", idx);
756 hf->channel = dev->channel;
760 if (can_is_canfd_skb(skb)) {
761 cfd = (struct canfd_frame *)skb->data;
763 hf->can_id = cpu_to_le32(cfd->can_id);
764 hf->can_dlc = can_fd_len2dlc(cfd->len);
765 hf->flags |= GS_CAN_FLAG_FD;
766 if (cfd->flags & CANFD_BRS)
767 hf->flags |= GS_CAN_FLAG_BRS;
768 if (cfd->flags & CANFD_ESI)
769 hf->flags |= GS_CAN_FLAG_ESI;
771 memcpy(hf->canfd->data, cfd->data, cfd->len);
773 cf = (struct can_frame *)skb->data;
775 hf->can_id = cpu_to_le32(cf->can_id);
776 hf->can_dlc = can_get_cc_dlc(cf, dev->can.ctrlmode);
778 memcpy(hf->classic_can->data, cf->data, cf->len);
781 usb_fill_bulk_urb(urb, dev->udev,
782 usb_sndbulkpipe(dev->udev, GS_USB_ENDPOINT_OUT),
784 gs_usb_xmit_callback, txc);
786 urb->transfer_flags |= URB_FREE_BUFFER;
787 usb_anchor_urb(urb, &dev->tx_submitted);
789 can_put_echo_skb(skb, netdev, idx, 0);
791 atomic_inc(&dev->active_tx_urbs);
793 rc = usb_submit_urb(urb, GFP_ATOMIC);
794 if (unlikely(rc)) { /* usb send failed */
795 atomic_dec(&dev->active_tx_urbs);
797 can_free_echo_skb(netdev, idx, NULL);
798 gs_free_tx_context(txc);
800 usb_unanchor_urb(urb);
803 netif_device_detach(netdev);
805 netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
809 /* Slow down tx path */
810 if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
811 netif_stop_queue(netdev);
814 /* let usb core take care of this urb */
825 gs_free_tx_context(txc);
831 static int gs_can_open(struct net_device *netdev)
833 struct gs_can *dev = netdev_priv(netdev);
834 struct gs_usb *parent = dev->parent;
835 struct gs_device_mode dm = {
836 .mode = cpu_to_le32(GS_CAN_MODE_START),
838 struct gs_host_frame *hf;
839 struct urb *urb = NULL;
844 rc = open_candev(netdev);
848 ctrlmode = dev->can.ctrlmode;
849 if (ctrlmode & CAN_CTRLMODE_FD) {
850 if (dev->feature & GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX)
851 dev->hf_size_tx = struct_size(hf, canfd_quirk, 1);
853 dev->hf_size_tx = struct_size(hf, canfd, 1);
855 if (dev->feature & GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX)
856 dev->hf_size_tx = struct_size(hf, classic_can_quirk, 1);
858 dev->hf_size_tx = struct_size(hf, classic_can, 1);
861 if (!parent->active_channels) {
862 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
863 gs_usb_timestamp_init(parent);
865 for (i = 0; i < GS_MAX_RX_URBS; i++) {
869 urb = usb_alloc_urb(0, GFP_KERNEL);
872 goto out_usb_kill_anchored_urbs;
875 /* alloc rx buffer */
876 buf = kmalloc(dev->parent->hf_size_rx,
880 "No memory left for USB buffer\n");
882 goto out_usb_free_urb;
885 /* fill, anchor, and submit rx urb */
886 usb_fill_bulk_urb(urb,
888 usb_rcvbulkpipe(dev->udev,
891 dev->parent->hf_size_rx,
892 gs_usb_receive_bulk_callback, parent);
893 urb->transfer_flags |= URB_FREE_BUFFER;
895 usb_anchor_urb(urb, &parent->rx_submitted);
897 rc = usb_submit_urb(urb, GFP_KERNEL);
900 netif_device_detach(dev->netdev);
903 "usb_submit failed (err=%d)\n", rc);
905 goto out_usb_unanchor_urb;
909 * USB core will take care of freeing it
916 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
917 flags |= GS_CAN_MODE_LOOP_BACK;
919 if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
920 flags |= GS_CAN_MODE_LISTEN_ONLY;
922 if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
923 flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
925 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
926 flags |= GS_CAN_MODE_ONE_SHOT;
928 if (ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
929 flags |= GS_CAN_MODE_BERR_REPORTING;
931 if (ctrlmode & CAN_CTRLMODE_FD)
932 flags |= GS_CAN_MODE_FD;
934 /* if hardware supports timestamps, enable it */
935 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
936 flags |= GS_CAN_MODE_HW_TIMESTAMP;
938 /* finally start device */
939 dev->can.state = CAN_STATE_ERROR_ACTIVE;
940 dm.flags = cpu_to_le32(flags);
941 rc = usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_MODE,
942 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
943 dev->channel, 0, &dm, sizeof(dm), 1000,
946 netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
947 dev->can.state = CAN_STATE_STOPPED;
949 goto out_usb_kill_anchored_urbs;
952 parent->active_channels++;
953 if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
954 netif_start_queue(netdev);
958 out_usb_unanchor_urb:
959 usb_unanchor_urb(urb);
962 out_usb_kill_anchored_urbs:
963 if (!parent->active_channels) {
964 usb_kill_anchored_urbs(&dev->tx_submitted);
966 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
967 gs_usb_timestamp_stop(parent);
970 close_candev(netdev);
975 static int gs_usb_get_state(const struct net_device *netdev,
976 struct can_berr_counter *bec,
977 enum can_state *state)
979 struct gs_can *dev = netdev_priv(netdev);
980 struct gs_device_state ds;
983 rc = usb_control_msg_recv(dev->udev, 0, GS_USB_BREQ_GET_STATE,
984 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
987 USB_CTRL_GET_TIMEOUT,
992 if (le32_to_cpu(ds.state) >= CAN_STATE_MAX)
995 *state = le32_to_cpu(ds.state);
996 bec->txerr = le32_to_cpu(ds.txerr);
997 bec->rxerr = le32_to_cpu(ds.rxerr);
1002 static int gs_usb_can_get_berr_counter(const struct net_device *netdev,
1003 struct can_berr_counter *bec)
1005 enum can_state state;
1007 return gs_usb_get_state(netdev, bec, &state);
1010 static int gs_can_close(struct net_device *netdev)
1013 struct gs_can *dev = netdev_priv(netdev);
1014 struct gs_usb *parent = dev->parent;
1016 netif_stop_queue(netdev);
1019 parent->active_channels--;
1020 if (!parent->active_channels) {
1021 usb_kill_anchored_urbs(&parent->rx_submitted);
1023 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1024 gs_usb_timestamp_stop(parent);
1027 /* Stop sending URBs */
1028 usb_kill_anchored_urbs(&dev->tx_submitted);
1029 atomic_set(&dev->active_tx_urbs, 0);
1031 dev->can.state = CAN_STATE_STOPPED;
1033 /* reset the device */
1034 rc = gs_cmd_reset(dev);
1036 netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
1038 /* reset tx contexts */
1039 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
1040 dev->tx_context[rc].dev = dev;
1041 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
1044 /* close the netdev */
1045 close_candev(netdev);
1050 static int gs_can_eth_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1052 const struct gs_can *dev = netdev_priv(netdev);
1054 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1055 return can_eth_ioctl_hwts(netdev, ifr, cmd);
1060 static const struct net_device_ops gs_usb_netdev_ops = {
1061 .ndo_open = gs_can_open,
1062 .ndo_stop = gs_can_close,
1063 .ndo_start_xmit = gs_can_start_xmit,
1064 .ndo_change_mtu = can_change_mtu,
1065 .ndo_eth_ioctl = gs_can_eth_ioctl,
1068 static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
1070 struct gs_can *dev = netdev_priv(netdev);
1071 struct gs_identify_mode imode;
1074 imode.mode = cpu_to_le32(GS_CAN_IDENTIFY_ON);
1076 imode.mode = cpu_to_le32(GS_CAN_IDENTIFY_OFF);
1078 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_IDENTIFY,
1079 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1080 dev->channel, 0, &imode, sizeof(imode), 100,
1084 /* blink LED's for finding the this interface */
1085 static int gs_usb_set_phys_id(struct net_device *netdev,
1086 enum ethtool_phys_id_state state)
1088 const struct gs_can *dev = netdev_priv(netdev);
1091 if (!(dev->feature & GS_CAN_FEATURE_IDENTIFY))
1095 case ETHTOOL_ID_ACTIVE:
1096 rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_ON);
1098 case ETHTOOL_ID_INACTIVE:
1099 rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_OFF);
1108 static int gs_usb_get_ts_info(struct net_device *netdev,
1109 struct ethtool_ts_info *info)
1111 struct gs_can *dev = netdev_priv(netdev);
1113 /* report if device supports HW timestamps */
1114 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1115 return can_ethtool_op_get_ts_info_hwts(netdev, info);
1117 return ethtool_op_get_ts_info(netdev, info);
1120 static const struct ethtool_ops gs_usb_ethtool_ops = {
1121 .set_phys_id = gs_usb_set_phys_id,
1122 .get_ts_info = gs_usb_get_ts_info,
1125 static int gs_usb_get_termination(struct net_device *netdev, u16 *term)
1127 struct gs_can *dev = netdev_priv(netdev);
1128 struct gs_device_termination_state term_state;
1131 rc = usb_control_msg_recv(dev->udev, 0, GS_USB_BREQ_GET_TERMINATION,
1132 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1134 &term_state, sizeof(term_state), 1000,
1139 if (term_state.state == cpu_to_le32(GS_CAN_TERMINATION_STATE_ON))
1140 *term = GS_USB_TERMINATION_ENABLED;
1142 *term = GS_USB_TERMINATION_DISABLED;
1147 static int gs_usb_set_termination(struct net_device *netdev, u16 term)
1149 struct gs_can *dev = netdev_priv(netdev);
1150 struct gs_device_termination_state term_state;
1152 if (term == GS_USB_TERMINATION_ENABLED)
1153 term_state.state = cpu_to_le32(GS_CAN_TERMINATION_STATE_ON);
1155 term_state.state = cpu_to_le32(GS_CAN_TERMINATION_STATE_OFF);
1157 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_SET_TERMINATION,
1158 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1160 &term_state, sizeof(term_state), 1000,
1164 static const u16 gs_usb_termination_const[] = {
1165 GS_USB_TERMINATION_DISABLED,
1166 GS_USB_TERMINATION_ENABLED
1169 static struct gs_can *gs_make_candev(unsigned int channel,
1170 struct usb_interface *intf,
1171 struct gs_device_config *dconf)
1174 struct net_device *netdev;
1176 struct gs_device_bt_const_extended bt_const_extended;
1177 struct gs_device_bt_const bt_const;
1180 /* fetch bit timing constants */
1181 rc = usb_control_msg_recv(interface_to_usbdev(intf), 0,
1182 GS_USB_BREQ_BT_CONST,
1183 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1184 channel, 0, &bt_const, sizeof(bt_const), 1000,
1189 "Couldn't get bit timing const for channel %d (%pe)\n",
1190 channel, ERR_PTR(rc));
1195 netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
1197 dev_err(&intf->dev, "Couldn't allocate candev\n");
1198 return ERR_PTR(-ENOMEM);
1201 dev = netdev_priv(netdev);
1203 netdev->netdev_ops = &gs_usb_netdev_ops;
1204 netdev->ethtool_ops = &gs_usb_ethtool_ops;
1206 netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
1207 netdev->dev_id = channel;
1210 strcpy(dev->bt_const.name, KBUILD_MODNAME);
1211 dev->bt_const.tseg1_min = le32_to_cpu(bt_const.tseg1_min);
1212 dev->bt_const.tseg1_max = le32_to_cpu(bt_const.tseg1_max);
1213 dev->bt_const.tseg2_min = le32_to_cpu(bt_const.tseg2_min);
1214 dev->bt_const.tseg2_max = le32_to_cpu(bt_const.tseg2_max);
1215 dev->bt_const.sjw_max = le32_to_cpu(bt_const.sjw_max);
1216 dev->bt_const.brp_min = le32_to_cpu(bt_const.brp_min);
1217 dev->bt_const.brp_max = le32_to_cpu(bt_const.brp_max);
1218 dev->bt_const.brp_inc = le32_to_cpu(bt_const.brp_inc);
1220 dev->udev = interface_to_usbdev(intf);
1221 dev->netdev = netdev;
1222 dev->channel = channel;
1224 init_usb_anchor(&dev->tx_submitted);
1225 atomic_set(&dev->active_tx_urbs, 0);
1226 spin_lock_init(&dev->tx_ctx_lock);
1227 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
1228 dev->tx_context[rc].dev = dev;
1229 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
1233 dev->can.state = CAN_STATE_STOPPED;
1234 dev->can.clock.freq = le32_to_cpu(bt_const.fclk_can);
1235 dev->can.bittiming_const = &dev->bt_const;
1236 dev->can.do_set_bittiming = gs_usb_set_bittiming;
1238 dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
1240 feature = le32_to_cpu(bt_const.feature);
1241 dev->feature = FIELD_GET(GS_CAN_FEATURE_MASK, feature);
1242 if (feature & GS_CAN_FEATURE_LISTEN_ONLY)
1243 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1245 if (feature & GS_CAN_FEATURE_LOOP_BACK)
1246 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
1248 if (feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
1249 dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1251 if (feature & GS_CAN_FEATURE_ONE_SHOT)
1252 dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
1254 if (feature & GS_CAN_FEATURE_FD) {
1255 dev->can.ctrlmode_supported |= CAN_CTRLMODE_FD;
1256 /* The data bit timing will be overwritten, if
1257 * GS_CAN_FEATURE_BT_CONST_EXT is set.
1259 dev->can.data_bittiming_const = &dev->bt_const;
1260 dev->can.do_set_data_bittiming = gs_usb_set_data_bittiming;
1263 if (feature & GS_CAN_FEATURE_TERMINATION) {
1264 rc = gs_usb_get_termination(netdev, &dev->can.termination);
1266 dev->feature &= ~GS_CAN_FEATURE_TERMINATION;
1268 dev_info(&intf->dev,
1269 "Disabling termination support for channel %d (%pe)\n",
1270 channel, ERR_PTR(rc));
1272 dev->can.termination_const = gs_usb_termination_const;
1273 dev->can.termination_const_cnt = ARRAY_SIZE(gs_usb_termination_const);
1274 dev->can.do_set_termination = gs_usb_set_termination;
1278 if (feature & GS_CAN_FEATURE_BERR_REPORTING)
1279 dev->can.ctrlmode_supported |= CAN_CTRLMODE_BERR_REPORTING;
1281 if (feature & GS_CAN_FEATURE_GET_STATE)
1282 dev->can.do_get_berr_counter = gs_usb_can_get_berr_counter;
1284 /* The CANtact Pro from LinkLayer Labs is based on the
1285 * LPC54616 µC, which is affected by the NXP LPC USB transfer
1286 * erratum. However, the current firmware (version 2) doesn't
1287 * set the GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX bit. Set the
1288 * feature GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX to workaround
1291 * For the GS_USB_BREQ_DATA_BITTIMING USB control message the
1292 * CANtact Pro firmware uses a request value, which is already
1293 * used by the candleLight firmware for a different purpose
1294 * (GS_USB_BREQ_GET_USER_ID). Set the feature
1295 * GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO to workaround this
1298 if (dev->udev->descriptor.idVendor == cpu_to_le16(USB_GS_USB_1_VENDOR_ID) &&
1299 dev->udev->descriptor.idProduct == cpu_to_le16(USB_GS_USB_1_PRODUCT_ID) &&
1300 dev->udev->manufacturer && dev->udev->product &&
1301 !strcmp(dev->udev->manufacturer, "LinkLayer Labs") &&
1302 !strcmp(dev->udev->product, "CANtact Pro") &&
1303 (le32_to_cpu(dconf->sw_version) <= 2))
1304 dev->feature |= GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX |
1305 GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO;
1307 /* GS_CAN_FEATURE_IDENTIFY is only supported for sw_version > 1 */
1308 if (!(le32_to_cpu(dconf->sw_version) > 1 &&
1309 feature & GS_CAN_FEATURE_IDENTIFY))
1310 dev->feature &= ~GS_CAN_FEATURE_IDENTIFY;
1312 /* fetch extended bit timing constants if device has feature
1313 * GS_CAN_FEATURE_FD and GS_CAN_FEATURE_BT_CONST_EXT
1315 if (feature & GS_CAN_FEATURE_FD &&
1316 feature & GS_CAN_FEATURE_BT_CONST_EXT) {
1317 rc = usb_control_msg_recv(interface_to_usbdev(intf), 0,
1318 GS_USB_BREQ_BT_CONST_EXT,
1319 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1320 channel, 0, &bt_const_extended,
1321 sizeof(bt_const_extended),
1325 "Couldn't get extended bit timing const for channel %d (%pe)\n",
1326 channel, ERR_PTR(rc));
1327 goto out_free_candev;
1330 strcpy(dev->data_bt_const.name, KBUILD_MODNAME);
1331 dev->data_bt_const.tseg1_min = le32_to_cpu(bt_const_extended.dtseg1_min);
1332 dev->data_bt_const.tseg1_max = le32_to_cpu(bt_const_extended.dtseg1_max);
1333 dev->data_bt_const.tseg2_min = le32_to_cpu(bt_const_extended.dtseg2_min);
1334 dev->data_bt_const.tseg2_max = le32_to_cpu(bt_const_extended.dtseg2_max);
1335 dev->data_bt_const.sjw_max = le32_to_cpu(bt_const_extended.dsjw_max);
1336 dev->data_bt_const.brp_min = le32_to_cpu(bt_const_extended.dbrp_min);
1337 dev->data_bt_const.brp_max = le32_to_cpu(bt_const_extended.dbrp_max);
1338 dev->data_bt_const.brp_inc = le32_to_cpu(bt_const_extended.dbrp_inc);
1340 dev->can.data_bittiming_const = &dev->data_bt_const;
1343 SET_NETDEV_DEV(netdev, &intf->dev);
1345 rc = register_candev(dev->netdev);
1348 "Couldn't register candev for channel %d (%pe)\n",
1349 channel, ERR_PTR(rc));
1350 goto out_free_candev;
1356 free_candev(dev->netdev);
1360 static void gs_destroy_candev(struct gs_can *dev)
1362 unregister_candev(dev->netdev);
1363 usb_kill_anchored_urbs(&dev->tx_submitted);
1364 free_candev(dev->netdev);
1367 static int gs_usb_probe(struct usb_interface *intf,
1368 const struct usb_device_id *id)
1370 struct usb_device *udev = interface_to_usbdev(intf);
1371 struct gs_host_frame *hf;
1373 struct gs_host_config hconf = {
1374 .byte_order = cpu_to_le32(0x0000beef),
1376 struct gs_device_config dconf;
1377 unsigned int icount, i;
1380 /* send host config */
1381 rc = usb_control_msg_send(udev, 0,
1382 GS_USB_BREQ_HOST_FORMAT,
1383 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1384 1, intf->cur_altsetting->desc.bInterfaceNumber,
1385 &hconf, sizeof(hconf), 1000,
1388 dev_err(&intf->dev, "Couldn't send data format (err=%d)\n", rc);
1392 /* read device config */
1393 rc = usb_control_msg_recv(udev, 0,
1394 GS_USB_BREQ_DEVICE_CONFIG,
1395 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1396 1, intf->cur_altsetting->desc.bInterfaceNumber,
1397 &dconf, sizeof(dconf), 1000,
1400 dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
1405 icount = dconf.icount + 1;
1406 dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
1408 if (icount > GS_MAX_INTF) {
1410 "Driver cannot handle more that %u CAN interfaces\n",
1415 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1419 init_usb_anchor(&dev->rx_submitted);
1421 usb_set_intfdata(intf, dev);
1424 for (i = 0; i < icount; i++) {
1425 unsigned int hf_size_rx = 0;
1427 dev->canch[i] = gs_make_candev(i, intf, &dconf);
1428 if (IS_ERR_OR_NULL(dev->canch[i])) {
1429 /* save error code to return later */
1430 rc = PTR_ERR(dev->canch[i]);
1432 /* on failure destroy previously created candevs */
1434 for (i = 0; i < icount; i++)
1435 gs_destroy_candev(dev->canch[i]);
1437 usb_kill_anchored_urbs(&dev->rx_submitted);
1441 dev->canch[i]->parent = dev;
1443 /* set RX packet size based on FD and if hardware
1444 * timestamps are supported.
1446 if (dev->canch[i]->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
1447 if (dev->canch[i]->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1448 hf_size_rx = struct_size(hf, canfd_ts, 1);
1450 hf_size_rx = struct_size(hf, canfd, 1);
1452 if (dev->canch[i]->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1453 hf_size_rx = struct_size(hf, classic_can_ts, 1);
1455 hf_size_rx = struct_size(hf, classic_can, 1);
1457 dev->hf_size_rx = max(dev->hf_size_rx, hf_size_rx);
1463 static void gs_usb_disconnect(struct usb_interface *intf)
1465 struct gs_usb *dev = usb_get_intfdata(intf);
1468 usb_set_intfdata(intf, NULL);
1471 dev_err(&intf->dev, "Disconnect (nodata)\n");
1475 for (i = 0; i < GS_MAX_INTF; i++)
1477 gs_destroy_candev(dev->canch[i]);
1479 usb_kill_anchored_urbs(&dev->rx_submitted);
1483 static const struct usb_device_id gs_usb_table[] = {
1484 { USB_DEVICE_INTERFACE_NUMBER(USB_GS_USB_1_VENDOR_ID,
1485 USB_GS_USB_1_PRODUCT_ID, 0) },
1486 { USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
1487 USB_CANDLELIGHT_PRODUCT_ID, 0) },
1488 { USB_DEVICE_INTERFACE_NUMBER(USB_CES_CANEXT_FD_VENDOR_ID,
1489 USB_CES_CANEXT_FD_PRODUCT_ID, 0) },
1490 { USB_DEVICE_INTERFACE_NUMBER(USB_ABE_CANDEBUGGER_FD_VENDOR_ID,
1491 USB_ABE_CANDEBUGGER_FD_PRODUCT_ID, 0) },
1492 {} /* Terminating entry */
1495 MODULE_DEVICE_TABLE(usb, gs_usb_table);
1497 static struct usb_driver gs_usb_driver = {
1498 .name = KBUILD_MODNAME,
1499 .probe = gs_usb_probe,
1500 .disconnect = gs_usb_disconnect,
1501 .id_table = gs_usb_table,
1504 module_usb_driver(gs_usb_driver);
1506 MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
1508 "Socket CAN device driver for Geschwister Schneider Technologie-, "
1509 "Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
1510 "and bytewerk.org candleLight USB CAN interfaces.");
1511 MODULE_LICENSE("GPL v2");