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/init.h>
13 #include <linux/signal.h>
14 #include <linux/module.h>
15 #include <linux/netdevice.h>
16 #include <linux/usb.h>
18 #include <linux/can.h>
19 #include <linux/can/dev.h>
20 #include <linux/can/error.h>
22 /* Device specific constants */
23 #define USB_GSUSB_1_VENDOR_ID 0x1d50
24 #define USB_GSUSB_1_PRODUCT_ID 0x606f
26 #define USB_CANDLELIGHT_VENDOR_ID 0x1209
27 #define USB_CANDLELIGHT_PRODUCT_ID 0x2323
29 #define GSUSB_ENDPOINT_IN 1
30 #define GSUSB_ENDPOINT_OUT 2
32 /* Device specific constants */
34 GS_USB_BREQ_HOST_FORMAT = 0,
35 GS_USB_BREQ_BITTIMING,
39 GS_USB_BREQ_DEVICE_CONFIG,
40 GS_USB_BREQ_TIMESTAMP,
45 /* reset a channel. turns it off */
46 GS_CAN_MODE_RESET = 0,
47 /* starts a channel */
52 GS_CAN_STATE_ERROR_ACTIVE = 0,
53 GS_CAN_STATE_ERROR_WARNING,
54 GS_CAN_STATE_ERROR_PASSIVE,
60 enum gs_can_identify_mode {
61 GS_CAN_IDENTIFY_OFF = 0,
65 /* data types passed between host and device */
66 struct gs_host_config {
69 /* All data exchanged between host and device is exchanged in host byte order,
70 * thanks to the struct gs_host_config byte_order member, which is sent first
71 * to indicate the desired byte order.
74 struct gs_device_config {
83 #define GS_CAN_MODE_NORMAL 0
84 #define GS_CAN_MODE_LISTEN_ONLY BIT(0)
85 #define GS_CAN_MODE_LOOP_BACK BIT(1)
86 #define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2)
87 #define GS_CAN_MODE_ONE_SHOT BIT(3)
89 struct gs_device_mode {
94 struct gs_device_state {
100 struct gs_device_bittiming {
108 struct gs_identify_mode {
112 #define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
113 #define GS_CAN_FEATURE_LOOP_BACK BIT(1)
114 #define GS_CAN_FEATURE_TRIPLE_SAMPLE BIT(2)
115 #define GS_CAN_FEATURE_ONE_SHOT BIT(3)
116 #define GS_CAN_FEATURE_HW_TIMESTAMP BIT(4)
117 #define GS_CAN_FEATURE_IDENTIFY BIT(5)
119 struct gs_device_bt_const {
132 #define GS_CAN_FLAG_OVERFLOW 1
134 struct gs_host_frame {
145 /* The GS USB devices make use of the same flags and masks as in
146 * linux/can.h and linux/can/error.h, and no additional mapping is necessary.
149 /* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
150 #define GS_MAX_TX_URBS 10
151 /* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
152 #define GS_MAX_RX_URBS 30
153 /* Maximum number of interfaces the driver supports per device.
154 * Current hardware only supports 2 interfaces. The future may vary.
156 #define GS_MAX_INTF 2
158 struct gs_tx_context {
160 unsigned int echo_id;
164 struct can_priv can; /* must be the first member */
166 struct gs_usb *parent;
168 struct net_device *netdev;
169 struct usb_device *udev;
170 struct usb_interface *iface;
172 struct can_bittiming_const bt_const;
173 unsigned int channel; /* channel number */
175 /* This lock prevents a race condition between xmit and receive. */
176 spinlock_t tx_ctx_lock;
177 struct gs_tx_context tx_context[GS_MAX_TX_URBS];
179 struct usb_anchor tx_submitted;
180 atomic_t active_tx_urbs;
183 /* usb interface struct */
185 struct gs_can *canch[GS_MAX_INTF];
186 struct usb_anchor rx_submitted;
187 atomic_t active_channels;
188 struct usb_device *udev;
191 /* 'allocate' a tx context.
192 * returns a valid tx context or NULL if there is no space.
194 static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
199 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
201 for (; i < GS_MAX_TX_URBS; i++) {
202 if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
203 dev->tx_context[i].echo_id = i;
204 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
205 return &dev->tx_context[i];
209 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
213 /* releases a tx context
215 static void gs_free_tx_context(struct gs_tx_context *txc)
217 txc->echo_id = GS_MAX_TX_URBS;
220 /* Get a tx context by id.
222 static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
227 if (id < GS_MAX_TX_URBS) {
228 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
229 if (dev->tx_context[id].echo_id == id) {
230 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
231 return &dev->tx_context[id];
233 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
238 static int gs_cmd_reset(struct gs_can *gsdev)
240 struct gs_device_mode *dm;
241 struct usb_interface *intf = gsdev->iface;
244 dm = kzalloc(sizeof(*dm), GFP_KERNEL);
248 dm->mode = GS_CAN_MODE_RESET;
250 rc = usb_control_msg(interface_to_usbdev(intf),
251 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
253 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
265 static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
267 struct can_device_stats *can_stats = &dev->can.can_stats;
269 if (cf->can_id & CAN_ERR_RESTARTED) {
270 dev->can.state = CAN_STATE_ERROR_ACTIVE;
271 can_stats->restarts++;
272 } else if (cf->can_id & CAN_ERR_BUSOFF) {
273 dev->can.state = CAN_STATE_BUS_OFF;
274 can_stats->bus_off++;
275 } else if (cf->can_id & CAN_ERR_CRTL) {
276 if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
277 (cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
278 dev->can.state = CAN_STATE_ERROR_WARNING;
279 can_stats->error_warning++;
280 } else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
281 (cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
282 dev->can.state = CAN_STATE_ERROR_PASSIVE;
283 can_stats->error_passive++;
285 dev->can.state = CAN_STATE_ERROR_ACTIVE;
290 static void gs_usb_receive_bulk_callback(struct urb *urb)
292 struct gs_usb *usbcan = urb->context;
294 struct net_device *netdev;
296 struct net_device_stats *stats;
297 struct gs_host_frame *hf = urb->transfer_buffer;
298 struct gs_tx_context *txc;
299 struct can_frame *cf;
304 switch (urb->status) {
305 case 0: /* success */
311 /* do not resubmit aborted urbs. eg: when device goes down */
315 /* device reports out of range channel id */
316 if (hf->channel >= GS_MAX_INTF)
319 dev = usbcan->canch[hf->channel];
321 netdev = dev->netdev;
322 stats = &netdev->stats;
324 if (!netif_device_present(netdev))
327 if (hf->echo_id == -1) { /* normal rx */
328 skb = alloc_can_skb(dev->netdev, &cf);
332 cf->can_id = hf->can_id;
334 cf->can_dlc = get_can_dlc(hf->can_dlc);
335 memcpy(cf->data, hf->data, 8);
337 /* ERROR frames tell us information about the controller */
338 if (hf->can_id & CAN_ERR_FLAG)
339 gs_update_state(dev, cf);
341 netdev->stats.rx_packets++;
342 netdev->stats.rx_bytes += hf->can_dlc;
345 } else { /* echo_id == hf->echo_id */
346 if (hf->echo_id >= GS_MAX_TX_URBS) {
348 "Unexpected out of range echo id %d\n",
353 netdev->stats.tx_packets++;
354 netdev->stats.tx_bytes += hf->can_dlc;
356 txc = gs_get_tx_context(dev, hf->echo_id);
358 /* bad devices send bad echo_ids. */
361 "Unexpected unused echo id %d\n",
366 can_get_echo_skb(netdev, hf->echo_id);
368 gs_free_tx_context(txc);
370 atomic_dec(&dev->active_tx_urbs);
372 netif_wake_queue(netdev);
375 if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
376 skb = alloc_can_err_skb(netdev, &cf);
380 cf->can_id |= CAN_ERR_CRTL;
381 cf->can_dlc = CAN_ERR_DLC;
382 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
383 stats->rx_over_errors++;
389 usb_fill_bulk_urb(urb,
391 usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
393 sizeof(struct gs_host_frame),
394 gs_usb_receive_bulk_callback,
398 rc = usb_submit_urb(urb, GFP_ATOMIC);
400 /* USB failure take down all interfaces */
402 for (rc = 0; rc < GS_MAX_INTF; rc++) {
403 if (usbcan->canch[rc])
404 netif_device_detach(usbcan->canch[rc]->netdev);
409 static int gs_usb_set_bittiming(struct net_device *netdev)
411 struct gs_can *dev = netdev_priv(netdev);
412 struct can_bittiming *bt = &dev->can.bittiming;
413 struct usb_interface *intf = dev->iface;
415 struct gs_device_bittiming *dbt;
417 dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
421 dbt->prop_seg = bt->prop_seg;
422 dbt->phase_seg1 = bt->phase_seg1;
423 dbt->phase_seg2 = bt->phase_seg2;
427 /* request bit timings */
428 rc = usb_control_msg(interface_to_usbdev(intf),
429 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
430 GS_USB_BREQ_BITTIMING,
431 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
441 dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
444 return (rc > 0) ? 0 : rc;
447 static void gs_usb_xmit_callback(struct urb *urb)
449 struct gs_tx_context *txc = urb->context;
450 struct gs_can *dev = txc->dev;
451 struct net_device *netdev = dev->netdev;
454 netdev_info(netdev, "usb xmit fail %d\n", txc->echo_id);
456 usb_free_coherent(urb->dev,
457 urb->transfer_buffer_length,
458 urb->transfer_buffer,
462 static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
463 struct net_device *netdev)
465 struct gs_can *dev = netdev_priv(netdev);
466 struct net_device_stats *stats = &dev->netdev->stats;
468 struct gs_host_frame *hf;
469 struct can_frame *cf;
472 struct gs_tx_context *txc;
474 if (can_dropped_invalid_skb(netdev, skb))
477 /* find an empty context to keep track of transmission */
478 txc = gs_alloc_tx_context(dev);
480 return NETDEV_TX_BUSY;
482 /* create a URB, and a buffer for it */
483 urb = usb_alloc_urb(0, GFP_ATOMIC);
487 hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
490 netdev_err(netdev, "No memory left for USB buffer\n");
496 if (idx >= GS_MAX_TX_URBS) {
497 netdev_err(netdev, "Invalid tx context %d\n", idx);
502 hf->channel = dev->channel;
504 cf = (struct can_frame *)skb->data;
506 hf->can_id = cf->can_id;
507 hf->can_dlc = cf->can_dlc;
508 memcpy(hf->data, cf->data, cf->can_dlc);
510 usb_fill_bulk_urb(urb, dev->udev,
511 usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
514 gs_usb_xmit_callback,
517 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
518 usb_anchor_urb(urb, &dev->tx_submitted);
520 can_put_echo_skb(skb, netdev, idx);
522 atomic_inc(&dev->active_tx_urbs);
524 rc = usb_submit_urb(urb, GFP_ATOMIC);
525 if (unlikely(rc)) { /* usb send failed */
526 atomic_dec(&dev->active_tx_urbs);
528 can_free_echo_skb(netdev, idx);
529 gs_free_tx_context(txc);
531 usb_unanchor_urb(urb);
532 usb_free_coherent(dev->udev,
538 netif_device_detach(netdev);
540 netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
544 /* Slow down tx path */
545 if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
546 netif_stop_queue(netdev);
549 /* let usb core take care of this urb */
555 usb_free_coherent(dev->udev,
563 gs_free_tx_context(txc);
569 static int gs_can_open(struct net_device *netdev)
571 struct gs_can *dev = netdev_priv(netdev);
572 struct gs_usb *parent = dev->parent;
574 struct gs_device_mode *dm;
577 rc = open_candev(netdev);
581 if (atomic_add_return(1, &parent->active_channels) == 1) {
582 for (i = 0; i < GS_MAX_RX_URBS; i++) {
587 urb = usb_alloc_urb(0, GFP_KERNEL);
591 /* alloc rx buffer */
592 buf = usb_alloc_coherent(dev->udev,
593 sizeof(struct gs_host_frame),
598 "No memory left for USB buffer\n");
603 /* fill, anchor, and submit rx urb */
604 usb_fill_bulk_urb(urb,
606 usb_rcvbulkpipe(dev->udev,
609 sizeof(struct gs_host_frame),
610 gs_usb_receive_bulk_callback,
612 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
614 usb_anchor_urb(urb, &parent->rx_submitted);
616 rc = usb_submit_urb(urb, GFP_KERNEL);
619 netif_device_detach(dev->netdev);
622 "usb_submit failed (err=%d)\n",
625 usb_unanchor_urb(urb);
631 * USB core will take care of freeing it
637 dm = kmalloc(sizeof(*dm), GFP_KERNEL);
642 ctrlmode = dev->can.ctrlmode;
645 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
646 dm->flags |= GS_CAN_MODE_LOOP_BACK;
647 else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
648 dm->flags |= GS_CAN_MODE_LISTEN_ONLY;
650 /* Controller is not allowed to retry TX
651 * this mode is unavailable on atmels uc3c hardware
653 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
654 dm->flags |= GS_CAN_MODE_ONE_SHOT;
656 if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
657 dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
659 /* finally start device */
660 dm->mode = GS_CAN_MODE_START;
661 rc = usb_control_msg(interface_to_usbdev(dev->iface),
662 usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
664 USB_DIR_OUT | USB_TYPE_VENDOR |
673 netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
680 dev->can.state = CAN_STATE_ERROR_ACTIVE;
682 if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
683 netif_start_queue(netdev);
688 static int gs_can_close(struct net_device *netdev)
691 struct gs_can *dev = netdev_priv(netdev);
692 struct gs_usb *parent = dev->parent;
694 netif_stop_queue(netdev);
697 if (atomic_dec_and_test(&parent->active_channels))
698 usb_kill_anchored_urbs(&parent->rx_submitted);
700 /* Stop sending URBs */
701 usb_kill_anchored_urbs(&dev->tx_submitted);
702 atomic_set(&dev->active_tx_urbs, 0);
704 /* reset the device */
705 rc = gs_cmd_reset(dev);
707 netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
709 /* reset tx contexts */
710 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
711 dev->tx_context[rc].dev = dev;
712 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
715 /* close the netdev */
716 close_candev(netdev);
721 static const struct net_device_ops gs_usb_netdev_ops = {
722 .ndo_open = gs_can_open,
723 .ndo_stop = gs_can_close,
724 .ndo_start_xmit = gs_can_start_xmit,
725 .ndo_change_mtu = can_change_mtu,
728 static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
730 struct gs_can *dev = netdev_priv(netdev);
731 struct gs_identify_mode *imode;
734 imode = kmalloc(sizeof(*imode), GFP_KERNEL);
740 imode->mode = GS_CAN_IDENTIFY_ON;
742 imode->mode = GS_CAN_IDENTIFY_OFF;
744 rc = usb_control_msg(interface_to_usbdev(dev->iface),
745 usb_sndctrlpipe(interface_to_usbdev(dev->iface),
747 GS_USB_BREQ_IDENTIFY,
748 USB_DIR_OUT | USB_TYPE_VENDOR |
758 return (rc > 0) ? 0 : rc;
761 /* blink LED's for finding the this interface */
762 static int gs_usb_set_phys_id(struct net_device *dev,
763 enum ethtool_phys_id_state state)
768 case ETHTOOL_ID_ACTIVE:
769 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
771 case ETHTOOL_ID_INACTIVE:
772 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
781 static const struct ethtool_ops gs_usb_ethtool_ops = {
782 .set_phys_id = gs_usb_set_phys_id,
785 static struct gs_can *gs_make_candev(unsigned int channel,
786 struct usb_interface *intf,
787 struct gs_device_config *dconf)
790 struct net_device *netdev;
792 struct gs_device_bt_const *bt_const;
794 bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
796 return ERR_PTR(-ENOMEM);
798 /* fetch bit timing constants */
799 rc = usb_control_msg(interface_to_usbdev(intf),
800 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
801 GS_USB_BREQ_BT_CONST,
802 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
811 "Couldn't get bit timing const for channel (err=%d)\n",
818 netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
820 dev_err(&intf->dev, "Couldn't allocate candev\n");
822 return ERR_PTR(-ENOMEM);
825 dev = netdev_priv(netdev);
827 netdev->netdev_ops = &gs_usb_netdev_ops;
829 netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
832 strcpy(dev->bt_const.name, "gs_usb");
833 dev->bt_const.tseg1_min = bt_const->tseg1_min;
834 dev->bt_const.tseg1_max = bt_const->tseg1_max;
835 dev->bt_const.tseg2_min = bt_const->tseg2_min;
836 dev->bt_const.tseg2_max = bt_const->tseg2_max;
837 dev->bt_const.sjw_max = bt_const->sjw_max;
838 dev->bt_const.brp_min = bt_const->brp_min;
839 dev->bt_const.brp_max = bt_const->brp_max;
840 dev->bt_const.brp_inc = bt_const->brp_inc;
842 dev->udev = interface_to_usbdev(intf);
844 dev->netdev = netdev;
845 dev->channel = channel;
847 init_usb_anchor(&dev->tx_submitted);
848 atomic_set(&dev->active_tx_urbs, 0);
849 spin_lock_init(&dev->tx_ctx_lock);
850 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
851 dev->tx_context[rc].dev = dev;
852 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
856 dev->can.state = CAN_STATE_STOPPED;
857 dev->can.clock.freq = bt_const->fclk_can;
858 dev->can.bittiming_const = &dev->bt_const;
859 dev->can.do_set_bittiming = gs_usb_set_bittiming;
861 dev->can.ctrlmode_supported = 0;
863 if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
864 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
866 if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
867 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
869 if (bt_const->feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
870 dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
872 if (bt_const->feature & GS_CAN_FEATURE_ONE_SHOT)
873 dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
875 SET_NETDEV_DEV(netdev, &intf->dev);
877 if (dconf->sw_version > 1)
878 if (bt_const->feature & GS_CAN_FEATURE_IDENTIFY)
879 netdev->ethtool_ops = &gs_usb_ethtool_ops;
883 rc = register_candev(dev->netdev);
885 free_candev(dev->netdev);
886 dev_err(&intf->dev, "Couldn't register candev (err=%d)\n", rc);
893 static void gs_destroy_candev(struct gs_can *dev)
895 unregister_candev(dev->netdev);
896 usb_kill_anchored_urbs(&dev->tx_submitted);
897 free_candev(dev->netdev);
900 static int gs_usb_probe(struct usb_interface *intf,
901 const struct usb_device_id *id)
905 unsigned int icount, i;
906 struct gs_host_config *hconf;
907 struct gs_device_config *dconf;
909 hconf = kmalloc(sizeof(*hconf), GFP_KERNEL);
913 hconf->byte_order = 0x0000beef;
915 /* send host config */
916 rc = usb_control_msg(interface_to_usbdev(intf),
917 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
918 GS_USB_BREQ_HOST_FORMAT,
919 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
921 intf->cur_altsetting->desc.bInterfaceNumber,
929 dev_err(&intf->dev, "Couldn't send data format (err=%d)\n",
934 dconf = kmalloc(sizeof(*dconf), GFP_KERNEL);
938 /* read device config */
939 rc = usb_control_msg(interface_to_usbdev(intf),
940 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
941 GS_USB_BREQ_DEVICE_CONFIG,
942 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
944 intf->cur_altsetting->desc.bInterfaceNumber,
949 dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
955 icount = dconf->icount + 1;
956 dev_info(&intf->dev, "Configuring for %d interfaces\n", icount);
958 if (icount > GS_MAX_INTF) {
960 "Driver cannot handle more that %d CAN interfaces\n",
966 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
972 init_usb_anchor(&dev->rx_submitted);
974 atomic_set(&dev->active_channels, 0);
976 usb_set_intfdata(intf, dev);
977 dev->udev = interface_to_usbdev(intf);
979 for (i = 0; i < icount; i++) {
980 dev->canch[i] = gs_make_candev(i, intf, dconf);
981 if (IS_ERR_OR_NULL(dev->canch[i])) {
982 /* save error code to return later */
983 rc = PTR_ERR(dev->canch[i]);
985 /* on failure destroy previously created candevs */
987 for (i = 0; i < icount; i++)
988 gs_destroy_candev(dev->canch[i]);
990 usb_kill_anchored_urbs(&dev->rx_submitted);
995 dev->canch[i]->parent = dev;
1003 static void gs_usb_disconnect(struct usb_interface *intf)
1006 struct gs_usb *dev = usb_get_intfdata(intf);
1007 usb_set_intfdata(intf, NULL);
1010 dev_err(&intf->dev, "Disconnect (nodata)\n");
1014 for (i = 0; i < GS_MAX_INTF; i++)
1016 gs_destroy_candev(dev->canch[i]);
1018 usb_kill_anchored_urbs(&dev->rx_submitted);
1022 static const struct usb_device_id gs_usb_table[] = {
1023 { USB_DEVICE_INTERFACE_NUMBER(USB_GSUSB_1_VENDOR_ID,
1024 USB_GSUSB_1_PRODUCT_ID, 0) },
1025 { USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
1026 USB_CANDLELIGHT_PRODUCT_ID, 0) },
1027 {} /* Terminating entry */
1030 MODULE_DEVICE_TABLE(usb, gs_usb_table);
1032 static struct usb_driver gs_usb_driver = {
1034 .probe = gs_usb_probe,
1035 .disconnect = gs_usb_disconnect,
1036 .id_table = gs_usb_table,
1039 module_usb_driver(gs_usb_driver);
1041 MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
1043 "Socket CAN device driver for Geschwister Schneider Technologie-, "
1044 "Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
1045 "and bytewerk.org candleLight USB CAN interfaces.");
1046 MODULE_LICENSE("GPL v2");