1 /* CAN driver for Geschwister Schneider USB/CAN devices
2 * and bytewerk.org candleLight USB CAN interfaces.
4 * Copyright (C) 2013-2016 Geschwister Schneider Technologie-,
5 * Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
6 * Copyright (C) 2016 Hubert Denkmair
8 * Many thanks to all socketcan devs!
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; version 2 of the License.
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
20 #include <linux/init.h>
21 #include <linux/signal.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/usb.h>
26 #include <linux/can.h>
27 #include <linux/can/dev.h>
28 #include <linux/can/error.h>
30 /* Device specific constants */
31 #define USB_GSUSB_1_VENDOR_ID 0x1d50
32 #define USB_GSUSB_1_PRODUCT_ID 0x606f
34 #define USB_CANDLELIGHT_VENDOR_ID 0x1209
35 #define USB_CANDLELIGHT_PRODUCT_ID 0x2323
37 #define GSUSB_ENDPOINT_IN 1
38 #define GSUSB_ENDPOINT_OUT 2
40 /* Device specific constants */
42 GS_USB_BREQ_HOST_FORMAT = 0,
43 GS_USB_BREQ_BITTIMING,
47 GS_USB_BREQ_DEVICE_CONFIG,
48 GS_USB_BREQ_TIMESTAMP,
53 /* reset a channel. turns it off */
54 GS_CAN_MODE_RESET = 0,
55 /* starts a channel */
60 GS_CAN_STATE_ERROR_ACTIVE = 0,
61 GS_CAN_STATE_ERROR_WARNING,
62 GS_CAN_STATE_ERROR_PASSIVE,
68 enum gs_can_identify_mode {
69 GS_CAN_IDENTIFY_OFF = 0,
73 /* data types passed between host and device */
74 struct gs_host_config {
77 /* All data exchanged between host and device is exchanged in host byte order,
78 * thanks to the struct gs_host_config byte_order member, which is sent first
79 * to indicate the desired byte order.
82 struct gs_device_config {
91 #define GS_CAN_MODE_NORMAL 0
92 #define GS_CAN_MODE_LISTEN_ONLY BIT(0)
93 #define GS_CAN_MODE_LOOP_BACK BIT(1)
94 #define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2)
95 #define GS_CAN_MODE_ONE_SHOT BIT(3)
97 struct gs_device_mode {
102 struct gs_device_state {
108 struct gs_device_bittiming {
116 struct gs_identify_mode {
120 #define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
121 #define GS_CAN_FEATURE_LOOP_BACK BIT(1)
122 #define GS_CAN_FEATURE_TRIPLE_SAMPLE BIT(2)
123 #define GS_CAN_FEATURE_ONE_SHOT BIT(3)
124 #define GS_CAN_FEATURE_HW_TIMESTAMP BIT(4)
125 #define GS_CAN_FEATURE_IDENTIFY BIT(5)
127 struct gs_device_bt_const {
140 #define GS_CAN_FLAG_OVERFLOW 1
142 struct gs_host_frame {
153 /* The GS USB devices make use of the same flags and masks as in
154 * linux/can.h and linux/can/error.h, and no additional mapping is necessary.
157 /* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
158 #define GS_MAX_TX_URBS 10
159 /* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
160 #define GS_MAX_RX_URBS 30
161 /* Maximum number of interfaces the driver supports per device.
162 * Current hardware only supports 2 interfaces. The future may vary.
164 #define GS_MAX_INTF 2
166 struct gs_tx_context {
168 unsigned int echo_id;
172 struct can_priv can; /* must be the first member */
174 struct gs_usb *parent;
176 struct net_device *netdev;
177 struct usb_device *udev;
178 struct usb_interface *iface;
180 struct can_bittiming_const bt_const;
181 unsigned int channel; /* channel number */
183 /* This lock prevents a race condition between xmit and receive. */
184 spinlock_t tx_ctx_lock;
185 struct gs_tx_context tx_context[GS_MAX_TX_URBS];
187 struct usb_anchor tx_submitted;
188 atomic_t active_tx_urbs;
191 /* usb interface struct */
193 struct gs_can *canch[GS_MAX_INTF];
194 struct usb_anchor rx_submitted;
195 atomic_t active_channels;
196 struct usb_device *udev;
199 /* 'allocate' a tx context.
200 * returns a valid tx context or NULL if there is no space.
202 static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
207 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
209 for (; i < GS_MAX_TX_URBS; i++) {
210 if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
211 dev->tx_context[i].echo_id = i;
212 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
213 return &dev->tx_context[i];
217 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
221 /* releases a tx context
223 static void gs_free_tx_context(struct gs_tx_context *txc)
225 txc->echo_id = GS_MAX_TX_URBS;
228 /* Get a tx context by id.
230 static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
235 if (id < GS_MAX_TX_URBS) {
236 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
237 if (dev->tx_context[id].echo_id == id) {
238 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
239 return &dev->tx_context[id];
241 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
246 static int gs_cmd_reset(struct gs_usb *gsusb, struct gs_can *gsdev)
248 struct gs_device_mode *dm;
249 struct usb_interface *intf = gsdev->iface;
252 dm = kzalloc(sizeof(*dm), GFP_KERNEL);
256 dm->mode = GS_CAN_MODE_RESET;
258 rc = usb_control_msg(interface_to_usbdev(intf),
259 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
261 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
271 static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
273 struct can_device_stats *can_stats = &dev->can.can_stats;
275 if (cf->can_id & CAN_ERR_RESTARTED) {
276 dev->can.state = CAN_STATE_ERROR_ACTIVE;
277 can_stats->restarts++;
278 } else if (cf->can_id & CAN_ERR_BUSOFF) {
279 dev->can.state = CAN_STATE_BUS_OFF;
280 can_stats->bus_off++;
281 } else if (cf->can_id & CAN_ERR_CRTL) {
282 if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
283 (cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
284 dev->can.state = CAN_STATE_ERROR_WARNING;
285 can_stats->error_warning++;
286 } else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
287 (cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
288 dev->can.state = CAN_STATE_ERROR_PASSIVE;
289 can_stats->error_passive++;
291 dev->can.state = CAN_STATE_ERROR_ACTIVE;
296 static void gs_usb_receive_bulk_callback(struct urb *urb)
298 struct gs_usb *usbcan = urb->context;
300 struct net_device *netdev;
302 struct net_device_stats *stats;
303 struct gs_host_frame *hf = urb->transfer_buffer;
304 struct gs_tx_context *txc;
305 struct can_frame *cf;
310 switch (urb->status) {
311 case 0: /* success */
317 /* do not resubmit aborted urbs. eg: when device goes down */
321 /* device reports out of range channel id */
322 if (hf->channel >= GS_MAX_INTF)
325 dev = usbcan->canch[hf->channel];
327 netdev = dev->netdev;
328 stats = &netdev->stats;
330 if (!netif_device_present(netdev))
333 if (hf->echo_id == -1) { /* normal rx */
334 skb = alloc_can_skb(dev->netdev, &cf);
338 cf->can_id = hf->can_id;
340 cf->can_dlc = get_can_dlc(hf->can_dlc);
341 memcpy(cf->data, hf->data, 8);
343 /* ERROR frames tell us information about the controller */
344 if (hf->can_id & CAN_ERR_FLAG)
345 gs_update_state(dev, cf);
347 netdev->stats.rx_packets++;
348 netdev->stats.rx_bytes += hf->can_dlc;
351 } else { /* echo_id == hf->echo_id */
352 if (hf->echo_id >= GS_MAX_TX_URBS) {
354 "Unexpected out of range echo id %d\n",
359 netdev->stats.tx_packets++;
360 netdev->stats.tx_bytes += hf->can_dlc;
362 txc = gs_get_tx_context(dev, hf->echo_id);
364 /* bad devices send bad echo_ids. */
367 "Unexpected unused echo id %d\n",
372 can_get_echo_skb(netdev, hf->echo_id);
374 gs_free_tx_context(txc);
376 netif_wake_queue(netdev);
379 if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
380 skb = alloc_can_err_skb(netdev, &cf);
384 cf->can_id |= CAN_ERR_CRTL;
385 cf->can_dlc = CAN_ERR_DLC;
386 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
387 stats->rx_over_errors++;
393 usb_fill_bulk_urb(urb,
395 usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
397 sizeof(struct gs_host_frame),
398 gs_usb_receive_bulk_callback,
402 rc = usb_submit_urb(urb, GFP_ATOMIC);
404 /* USB failure take down all interfaces */
406 for (rc = 0; rc < GS_MAX_INTF; rc++) {
407 if (usbcan->canch[rc])
408 netif_device_detach(usbcan->canch[rc]->netdev);
413 static int gs_usb_set_bittiming(struct net_device *netdev)
415 struct gs_can *dev = netdev_priv(netdev);
416 struct can_bittiming *bt = &dev->can.bittiming;
417 struct usb_interface *intf = dev->iface;
419 struct gs_device_bittiming *dbt;
421 dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
425 dbt->prop_seg = bt->prop_seg;
426 dbt->phase_seg1 = bt->phase_seg1;
427 dbt->phase_seg2 = bt->phase_seg2;
431 /* request bit timings */
432 rc = usb_control_msg(interface_to_usbdev(intf),
433 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
434 GS_USB_BREQ_BITTIMING,
435 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
445 dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
451 static void gs_usb_xmit_callback(struct urb *urb)
453 struct gs_tx_context *txc = urb->context;
454 struct gs_can *dev = txc->dev;
455 struct net_device *netdev = dev->netdev;
458 netdev_info(netdev, "usb xmit fail %d\n", txc->echo_id);
460 usb_free_coherent(urb->dev,
461 urb->transfer_buffer_length,
462 urb->transfer_buffer,
465 atomic_dec(&dev->active_tx_urbs);
467 if (!netif_device_present(netdev))
470 if (netif_queue_stopped(netdev))
471 netif_wake_queue(netdev);
474 static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
475 struct net_device *netdev)
477 struct gs_can *dev = netdev_priv(netdev);
478 struct net_device_stats *stats = &dev->netdev->stats;
480 struct gs_host_frame *hf;
481 struct can_frame *cf;
484 struct gs_tx_context *txc;
486 if (can_dropped_invalid_skb(netdev, skb))
489 /* find an empty context to keep track of transmission */
490 txc = gs_alloc_tx_context(dev);
492 return NETDEV_TX_BUSY;
494 /* create a URB, and a buffer for it */
495 urb = usb_alloc_urb(0, GFP_ATOMIC);
499 hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
502 netdev_err(netdev, "No memory left for USB buffer\n");
508 if (idx >= GS_MAX_TX_URBS) {
509 netdev_err(netdev, "Invalid tx context %d\n", idx);
514 hf->channel = dev->channel;
516 cf = (struct can_frame *)skb->data;
518 hf->can_id = cf->can_id;
519 hf->can_dlc = cf->can_dlc;
520 memcpy(hf->data, cf->data, cf->can_dlc);
522 usb_fill_bulk_urb(urb, dev->udev,
523 usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
526 gs_usb_xmit_callback,
529 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
530 usb_anchor_urb(urb, &dev->tx_submitted);
532 can_put_echo_skb(skb, netdev, idx);
534 atomic_inc(&dev->active_tx_urbs);
536 rc = usb_submit_urb(urb, GFP_ATOMIC);
537 if (unlikely(rc)) { /* usb send failed */
538 atomic_dec(&dev->active_tx_urbs);
540 can_free_echo_skb(netdev, idx);
541 gs_free_tx_context(txc);
543 usb_unanchor_urb(urb);
544 usb_free_coherent(dev->udev,
550 netif_device_detach(netdev);
552 netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
556 /* Slow down tx path */
557 if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
558 netif_stop_queue(netdev);
561 /* let usb core take care of this urb */
567 usb_free_coherent(dev->udev,
575 gs_free_tx_context(txc);
581 static int gs_can_open(struct net_device *netdev)
583 struct gs_can *dev = netdev_priv(netdev);
584 struct gs_usb *parent = dev->parent;
586 struct gs_device_mode *dm;
589 rc = open_candev(netdev);
593 if (atomic_add_return(1, &parent->active_channels) == 1) {
594 for (i = 0; i < GS_MAX_RX_URBS; i++) {
599 urb = usb_alloc_urb(0, GFP_KERNEL);
603 /* alloc rx buffer */
604 buf = usb_alloc_coherent(dev->udev,
605 sizeof(struct gs_host_frame),
610 "No memory left for USB buffer\n");
615 /* fill, anchor, and submit rx urb */
616 usb_fill_bulk_urb(urb,
618 usb_rcvbulkpipe(dev->udev,
621 sizeof(struct gs_host_frame),
622 gs_usb_receive_bulk_callback,
624 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
626 usb_anchor_urb(urb, &parent->rx_submitted);
628 rc = usb_submit_urb(urb, GFP_KERNEL);
631 netif_device_detach(dev->netdev);
634 "usb_submit failed (err=%d)\n",
637 usb_unanchor_urb(urb);
642 * USB core will take care of freeing it
648 dm = kmalloc(sizeof(*dm), GFP_KERNEL);
653 ctrlmode = dev->can.ctrlmode;
656 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
657 dm->flags |= GS_CAN_MODE_LOOP_BACK;
658 else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
659 dm->flags |= GS_CAN_MODE_LISTEN_ONLY;
661 /* Controller is not allowed to retry TX
662 * this mode is unavailable on atmels uc3c hardware
664 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
665 dm->flags |= GS_CAN_MODE_ONE_SHOT;
667 if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
668 dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
670 /* finally start device */
671 dm->mode = GS_CAN_MODE_START;
672 rc = usb_control_msg(interface_to_usbdev(dev->iface),
673 usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
675 USB_DIR_OUT | USB_TYPE_VENDOR |
684 netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
691 dev->can.state = CAN_STATE_ERROR_ACTIVE;
693 if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
694 netif_start_queue(netdev);
699 static int gs_can_close(struct net_device *netdev)
702 struct gs_can *dev = netdev_priv(netdev);
703 struct gs_usb *parent = dev->parent;
705 netif_stop_queue(netdev);
708 if (atomic_dec_and_test(&parent->active_channels))
709 usb_kill_anchored_urbs(&parent->rx_submitted);
711 /* Stop sending URBs */
712 usb_kill_anchored_urbs(&dev->tx_submitted);
713 atomic_set(&dev->active_tx_urbs, 0);
715 /* reset the device */
716 rc = gs_cmd_reset(parent, dev);
718 netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
720 /* reset tx contexts */
721 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
722 dev->tx_context[rc].dev = dev;
723 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
726 /* close the netdev */
727 close_candev(netdev);
732 static const struct net_device_ops gs_usb_netdev_ops = {
733 .ndo_open = gs_can_open,
734 .ndo_stop = gs_can_close,
735 .ndo_start_xmit = gs_can_start_xmit,
736 .ndo_change_mtu = can_change_mtu,
739 static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
741 struct gs_can *dev = netdev_priv(netdev);
742 struct gs_identify_mode imode;
746 imode.mode = GS_CAN_IDENTIFY_ON;
748 imode.mode = GS_CAN_IDENTIFY_OFF;
750 rc = usb_control_msg(interface_to_usbdev(dev->iface),
751 usb_sndctrlpipe(interface_to_usbdev(dev->iface),
753 GS_USB_BREQ_IDENTIFY,
754 USB_DIR_OUT | USB_TYPE_VENDOR |
762 return (rc > 0) ? 0 : rc;
765 /* blink LED's for finding the this interface */
766 static int gs_usb_set_phys_id(struct net_device *dev,
767 enum ethtool_phys_id_state state)
772 case ETHTOOL_ID_ACTIVE:
773 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
775 case ETHTOOL_ID_INACTIVE:
776 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
785 static const struct ethtool_ops gs_usb_ethtool_ops = {
786 .set_phys_id = gs_usb_set_phys_id,
789 static struct gs_can *gs_make_candev(unsigned int channel,
790 struct usb_interface *intf,
791 struct gs_device_config *dconf)
794 struct net_device *netdev;
796 struct gs_device_bt_const *bt_const;
798 bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
800 return ERR_PTR(-ENOMEM);
802 /* fetch bit timing constants */
803 rc = usb_control_msg(interface_to_usbdev(intf),
804 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
805 GS_USB_BREQ_BT_CONST,
806 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
815 "Couldn't get bit timing const for channel (err=%d)\n",
822 netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
824 dev_err(&intf->dev, "Couldn't allocate candev\n");
826 return ERR_PTR(-ENOMEM);
829 dev = netdev_priv(netdev);
831 netdev->netdev_ops = &gs_usb_netdev_ops;
833 netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
836 strcpy(dev->bt_const.name, "gs_usb");
837 dev->bt_const.tseg1_min = bt_const->tseg1_min;
838 dev->bt_const.tseg1_max = bt_const->tseg1_max;
839 dev->bt_const.tseg2_min = bt_const->tseg2_min;
840 dev->bt_const.tseg2_max = bt_const->tseg2_max;
841 dev->bt_const.sjw_max = bt_const->sjw_max;
842 dev->bt_const.brp_min = bt_const->brp_min;
843 dev->bt_const.brp_max = bt_const->brp_max;
844 dev->bt_const.brp_inc = bt_const->brp_inc;
846 dev->udev = interface_to_usbdev(intf);
848 dev->netdev = netdev;
849 dev->channel = channel;
851 init_usb_anchor(&dev->tx_submitted);
852 atomic_set(&dev->active_tx_urbs, 0);
853 spin_lock_init(&dev->tx_ctx_lock);
854 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
855 dev->tx_context[rc].dev = dev;
856 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
860 dev->can.state = CAN_STATE_STOPPED;
861 dev->can.clock.freq = bt_const->fclk_can;
862 dev->can.bittiming_const = &dev->bt_const;
863 dev->can.do_set_bittiming = gs_usb_set_bittiming;
865 dev->can.ctrlmode_supported = 0;
867 if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
868 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
870 if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
871 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
873 if (bt_const->feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
874 dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
876 if (bt_const->feature & GS_CAN_FEATURE_ONE_SHOT)
877 dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
879 SET_NETDEV_DEV(netdev, &intf->dev);
881 if (dconf->sw_version > 1)
882 if (bt_const->feature & GS_CAN_FEATURE_IDENTIFY)
883 netdev->ethtool_ops = &gs_usb_ethtool_ops;
887 rc = register_candev(dev->netdev);
889 free_candev(dev->netdev);
890 dev_err(&intf->dev, "Couldn't register candev (err=%d)\n", rc);
897 static void gs_destroy_candev(struct gs_can *dev)
899 unregister_candev(dev->netdev);
900 usb_kill_anchored_urbs(&dev->tx_submitted);
901 free_candev(dev->netdev);
904 static int gs_usb_probe(struct usb_interface *intf,
905 const struct usb_device_id *id)
909 unsigned int icount, i;
910 struct gs_host_config *hconf;
911 struct gs_device_config *dconf;
913 hconf = kmalloc(sizeof(*hconf), GFP_KERNEL);
917 hconf->byte_order = 0x0000beef;
919 /* send host config */
920 rc = usb_control_msg(interface_to_usbdev(intf),
921 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
922 GS_USB_BREQ_HOST_FORMAT,
923 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
925 intf->altsetting[0].desc.bInterfaceNumber,
933 dev_err(&intf->dev, "Couldn't send data format (err=%d)\n",
938 dconf = kmalloc(sizeof(*dconf), GFP_KERNEL);
942 /* read device config */
943 rc = usb_control_msg(interface_to_usbdev(intf),
944 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
945 GS_USB_BREQ_DEVICE_CONFIG,
946 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
948 intf->altsetting[0].desc.bInterfaceNumber,
953 dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
959 icount = dconf->icount + 1;
960 dev_info(&intf->dev, "Configuring for %d interfaces\n", icount);
962 if (icount > GS_MAX_INTF) {
964 "Driver cannot handle more that %d CAN interfaces\n",
970 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
976 init_usb_anchor(&dev->rx_submitted);
978 atomic_set(&dev->active_channels, 0);
980 usb_set_intfdata(intf, dev);
981 dev->udev = interface_to_usbdev(intf);
983 for (i = 0; i < icount; i++) {
984 dev->canch[i] = gs_make_candev(i, intf, dconf);
985 if (IS_ERR_OR_NULL(dev->canch[i])) {
986 /* save error code to return later */
987 rc = PTR_ERR(dev->canch[i]);
989 /* on failure destroy previously created candevs */
991 for (i = 0; i < icount; i++)
992 gs_destroy_candev(dev->canch[i]);
994 usb_kill_anchored_urbs(&dev->rx_submitted);
999 dev->canch[i]->parent = dev;
1007 static void gs_usb_disconnect(struct usb_interface *intf)
1010 struct gs_usb *dev = usb_get_intfdata(intf);
1011 usb_set_intfdata(intf, NULL);
1014 dev_err(&intf->dev, "Disconnect (nodata)\n");
1018 for (i = 0; i < GS_MAX_INTF; i++)
1020 gs_destroy_candev(dev->canch[i]);
1022 usb_kill_anchored_urbs(&dev->rx_submitted);
1026 static const struct usb_device_id gs_usb_table[] = {
1027 { USB_DEVICE_INTERFACE_NUMBER(USB_GSUSB_1_VENDOR_ID,
1028 USB_GSUSB_1_PRODUCT_ID, 0) },
1029 { USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
1030 USB_CANDLELIGHT_PRODUCT_ID, 0) },
1031 {} /* Terminating entry */
1034 MODULE_DEVICE_TABLE(usb, gs_usb_table);
1036 static struct usb_driver gs_usb_driver = {
1038 .probe = gs_usb_probe,
1039 .disconnect = gs_usb_disconnect,
1040 .id_table = gs_usb_table,
1043 module_usb_driver(gs_usb_driver);
1045 MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
1047 "Socket CAN device driver for Geschwister Schneider Technologie-, "
1048 "Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
1049 "and bytewerk.org candleLight USB CAN interfaces.");
1050 MODULE_LICENSE("GPL v2");