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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>
17
18#include <linux/can.h>
19#include <linux/can/dev.h>
20#include <linux/can/error.h>
21
22
23#define USB_GSUSB_1_VENDOR_ID 0x1d50
24#define USB_GSUSB_1_PRODUCT_ID 0x606f
25
26#define USB_CANDLELIGHT_VENDOR_ID 0x1209
27#define USB_CANDLELIGHT_PRODUCT_ID 0x2323
28
29#define GSUSB_ENDPOINT_IN 1
30#define GSUSB_ENDPOINT_OUT 2
31
32
33enum gs_usb_breq {
34 GS_USB_BREQ_HOST_FORMAT = 0,
35 GS_USB_BREQ_BITTIMING,
36 GS_USB_BREQ_MODE,
37 GS_USB_BREQ_BERR,
38 GS_USB_BREQ_BT_CONST,
39 GS_USB_BREQ_DEVICE_CONFIG,
40 GS_USB_BREQ_TIMESTAMP,
41 GS_USB_BREQ_IDENTIFY,
42};
43
44enum gs_can_mode {
45
46 GS_CAN_MODE_RESET = 0,
47
48 GS_CAN_MODE_START
49};
50
51enum gs_can_state {
52 GS_CAN_STATE_ERROR_ACTIVE = 0,
53 GS_CAN_STATE_ERROR_WARNING,
54 GS_CAN_STATE_ERROR_PASSIVE,
55 GS_CAN_STATE_BUS_OFF,
56 GS_CAN_STATE_STOPPED,
57 GS_CAN_STATE_SLEEPING
58};
59
60enum gs_can_identify_mode {
61 GS_CAN_IDENTIFY_OFF = 0,
62 GS_CAN_IDENTIFY_ON
63};
64
65
66struct gs_host_config {
67 u32 byte_order;
68} __packed;
69
70
71
72
73
74struct gs_device_config {
75 u8 reserved1;
76 u8 reserved2;
77 u8 reserved3;
78 u8 icount;
79 u32 sw_version;
80 u32 hw_version;
81} __packed;
82
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)
88
89struct gs_device_mode {
90 u32 mode;
91 u32 flags;
92} __packed;
93
94struct gs_device_state {
95 u32 state;
96 u32 rxerr;
97 u32 txerr;
98} __packed;
99
100struct gs_device_bittiming {
101 u32 prop_seg;
102 u32 phase_seg1;
103 u32 phase_seg2;
104 u32 sjw;
105 u32 brp;
106} __packed;
107
108struct gs_identify_mode {
109 u32 mode;
110} __packed;
111
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)
118
119struct gs_device_bt_const {
120 u32 feature;
121 u32 fclk_can;
122 u32 tseg1_min;
123 u32 tseg1_max;
124 u32 tseg2_min;
125 u32 tseg2_max;
126 u32 sjw_max;
127 u32 brp_min;
128 u32 brp_max;
129 u32 brp_inc;
130} __packed;
131
132#define GS_CAN_FLAG_OVERFLOW 1
133
134struct gs_host_frame {
135 u32 echo_id;
136 u32 can_id;
137
138 u8 can_dlc;
139 u8 channel;
140 u8 flags;
141 u8 reserved;
142
143 u8 data[8];
144} __packed;
145
146
147
148
149
150#define GS_MAX_TX_URBS 10
151
152#define GS_MAX_RX_URBS 30
153
154
155
156#define GS_MAX_INTF 2
157
158struct gs_tx_context {
159 struct gs_can *dev;
160 unsigned int echo_id;
161};
162
163struct gs_can {
164 struct can_priv can;
165
166 struct gs_usb *parent;
167
168 struct net_device *netdev;
169 struct usb_device *udev;
170 struct usb_interface *iface;
171
172 struct can_bittiming_const bt_const;
173 unsigned int channel;
174
175
176 spinlock_t tx_ctx_lock;
177 struct gs_tx_context tx_context[GS_MAX_TX_URBS];
178
179 struct usb_anchor tx_submitted;
180 atomic_t active_tx_urbs;
181};
182
183
184struct gs_usb {
185 struct gs_can *canch[GS_MAX_INTF];
186 struct usb_anchor rx_submitted;
187 atomic_t active_channels;
188 struct usb_device *udev;
189};
190
191
192
193
194static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
195{
196 int i = 0;
197 unsigned long flags;
198
199 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
200
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];
206 }
207 }
208
209 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
210 return NULL;
211}
212
213
214
215static void gs_free_tx_context(struct gs_tx_context *txc)
216{
217 txc->echo_id = GS_MAX_TX_URBS;
218}
219
220
221
222static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
223 unsigned int id)
224{
225 unsigned long flags;
226
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];
232 }
233 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
234 }
235 return NULL;
236}
237
238static int gs_cmd_reset(struct gs_can *gsdev)
239{
240 struct gs_device_mode *dm;
241 struct usb_interface *intf = gsdev->iface;
242 int rc;
243
244 dm = kzalloc(sizeof(*dm), GFP_KERNEL);
245 if (!dm)
246 return -ENOMEM;
247
248 dm->mode = GS_CAN_MODE_RESET;
249
250 rc = usb_control_msg(interface_to_usbdev(intf),
251 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
252 GS_USB_BREQ_MODE,
253 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
254 gsdev->channel,
255 0,
256 dm,
257 sizeof(*dm),
258 1000);
259
260 kfree(dm);
261
262 return rc;
263}
264
265static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
266{
267 struct can_device_stats *can_stats = &dev->can.can_stats;
268
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++;
284 } else {
285 dev->can.state = CAN_STATE_ERROR_ACTIVE;
286 }
287 }
288}
289
290static void gs_usb_receive_bulk_callback(struct urb *urb)
291{
292 struct gs_usb *usbcan = urb->context;
293 struct gs_can *dev;
294 struct net_device *netdev;
295 int rc;
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;
300 struct sk_buff *skb;
301
302 BUG_ON(!usbcan);
303
304 switch (urb->status) {
305 case 0:
306 break;
307 case -ENOENT:
308 case -ESHUTDOWN:
309 return;
310 default:
311
312 return;
313 }
314
315
316 if (hf->channel >= GS_MAX_INTF)
317 goto resubmit_urb;
318
319 dev = usbcan->canch[hf->channel];
320
321 netdev = dev->netdev;
322 stats = &netdev->stats;
323
324 if (!netif_device_present(netdev))
325 return;
326
327 if (hf->echo_id == -1) {
328 skb = alloc_can_skb(dev->netdev, &cf);
329 if (!skb)
330 return;
331
332 cf->can_id = hf->can_id;
333
334 cf->can_dlc = get_can_dlc(hf->can_dlc);
335 memcpy(cf->data, hf->data, 8);
336
337
338 if (hf->can_id & CAN_ERR_FLAG)
339 gs_update_state(dev, cf);
340
341 netdev->stats.rx_packets++;
342 netdev->stats.rx_bytes += hf->can_dlc;
343
344 netif_rx(skb);
345 } else {
346 if (hf->echo_id >= GS_MAX_TX_URBS) {
347 netdev_err(netdev,
348 "Unexpected out of range echo id %d\n",
349 hf->echo_id);
350 goto resubmit_urb;
351 }
352
353 netdev->stats.tx_packets++;
354 netdev->stats.tx_bytes += hf->can_dlc;
355
356 txc = gs_get_tx_context(dev, hf->echo_id);
357
358
359 if (!txc) {
360 netdev_err(netdev,
361 "Unexpected unused echo id %d\n",
362 hf->echo_id);
363 goto resubmit_urb;
364 }
365
366 can_get_echo_skb(netdev, hf->echo_id);
367
368 gs_free_tx_context(txc);
369
370 atomic_dec(&dev->active_tx_urbs);
371
372 netif_wake_queue(netdev);
373 }
374
375 if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
376 skb = alloc_can_err_skb(netdev, &cf);
377 if (!skb)
378 goto resubmit_urb;
379
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++;
384 stats->rx_errors++;
385 netif_rx(skb);
386 }
387
388 resubmit_urb:
389 usb_fill_bulk_urb(urb,
390 usbcan->udev,
391 usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
392 hf,
393 sizeof(struct gs_host_frame),
394 gs_usb_receive_bulk_callback,
395 usbcan
396 );
397
398 rc = usb_submit_urb(urb, GFP_ATOMIC);
399
400
401 if (rc == -ENODEV) {
402 for (rc = 0; rc < GS_MAX_INTF; rc++) {
403 if (usbcan->canch[rc])
404 netif_device_detach(usbcan->canch[rc]->netdev);
405 }
406 }
407}
408
409static int gs_usb_set_bittiming(struct net_device *netdev)
410{
411 struct gs_can *dev = netdev_priv(netdev);
412 struct can_bittiming *bt = &dev->can.bittiming;
413 struct usb_interface *intf = dev->iface;
414 int rc;
415 struct gs_device_bittiming *dbt;
416
417 dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
418 if (!dbt)
419 return -ENOMEM;
420
421 dbt->prop_seg = bt->prop_seg;
422 dbt->phase_seg1 = bt->phase_seg1;
423 dbt->phase_seg2 = bt->phase_seg2;
424 dbt->sjw = bt->sjw;
425 dbt->brp = bt->brp;
426
427
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,
432 dev->channel,
433 0,
434 dbt,
435 sizeof(*dbt),
436 1000);
437
438 kfree(dbt);
439
440 if (rc < 0)
441 dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
442 rc);
443
444 return (rc > 0) ? 0 : rc;
445}
446
447static void gs_usb_xmit_callback(struct urb *urb)
448{
449 struct gs_tx_context *txc = urb->context;
450 struct gs_can *dev = txc->dev;
451 struct net_device *netdev = dev->netdev;
452
453 if (urb->status)
454 netdev_info(netdev, "usb xmit fail %d\n", txc->echo_id);
455
456 usb_free_coherent(urb->dev,
457 urb->transfer_buffer_length,
458 urb->transfer_buffer,
459 urb->transfer_dma);
460}
461
462static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
463 struct net_device *netdev)
464{
465 struct gs_can *dev = netdev_priv(netdev);
466 struct net_device_stats *stats = &dev->netdev->stats;
467 struct urb *urb;
468 struct gs_host_frame *hf;
469 struct can_frame *cf;
470 int rc;
471 unsigned int idx;
472 struct gs_tx_context *txc;
473
474 if (can_dropped_invalid_skb(netdev, skb))
475 return NETDEV_TX_OK;
476
477
478 txc = gs_alloc_tx_context(dev);
479 if (!txc)
480 return NETDEV_TX_BUSY;
481
482
483 urb = usb_alloc_urb(0, GFP_ATOMIC);
484 if (!urb)
485 goto nomem_urb;
486
487 hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
488 &urb->transfer_dma);
489 if (!hf) {
490 netdev_err(netdev, "No memory left for USB buffer\n");
491 goto nomem_hf;
492 }
493
494 idx = txc->echo_id;
495
496 if (idx >= GS_MAX_TX_URBS) {
497 netdev_err(netdev, "Invalid tx context %d\n", idx);
498 goto badidx;
499 }
500
501 hf->echo_id = idx;
502 hf->channel = dev->channel;
503
504 cf = (struct can_frame *)skb->data;
505
506 hf->can_id = cf->can_id;
507 hf->can_dlc = cf->can_dlc;
508 memcpy(hf->data, cf->data, cf->can_dlc);
509
510 usb_fill_bulk_urb(urb, dev->udev,
511 usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
512 hf,
513 sizeof(*hf),
514 gs_usb_xmit_callback,
515 txc);
516
517 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
518 usb_anchor_urb(urb, &dev->tx_submitted);
519
520 can_put_echo_skb(skb, netdev, idx);
521
522 atomic_inc(&dev->active_tx_urbs);
523
524 rc = usb_submit_urb(urb, GFP_ATOMIC);
525 if (unlikely(rc)) {
526 atomic_dec(&dev->active_tx_urbs);
527
528 can_free_echo_skb(netdev, idx);
529 gs_free_tx_context(txc);
530
531 usb_unanchor_urb(urb);
532 usb_free_coherent(dev->udev,
533 sizeof(*hf),
534 hf,
535 urb->transfer_dma);
536
537 if (rc == -ENODEV) {
538 netif_device_detach(netdev);
539 } else {
540 netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
541 stats->tx_dropped++;
542 }
543 } else {
544
545 if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
546 netif_stop_queue(netdev);
547 }
548
549
550 usb_free_urb(urb);
551
552 return NETDEV_TX_OK;
553
554 badidx:
555 usb_free_coherent(dev->udev,
556 sizeof(*hf),
557 hf,
558 urb->transfer_dma);
559 nomem_hf:
560 usb_free_urb(urb);
561
562 nomem_urb:
563 gs_free_tx_context(txc);
564 dev_kfree_skb(skb);
565 stats->tx_dropped++;
566 return NETDEV_TX_OK;
567}
568
569static int gs_can_open(struct net_device *netdev)
570{
571 struct gs_can *dev = netdev_priv(netdev);
572 struct gs_usb *parent = dev->parent;
573 int rc, i;
574 struct gs_device_mode *dm;
575 u32 ctrlmode;
576
577 rc = open_candev(netdev);
578 if (rc)
579 return rc;
580
581 if (atomic_add_return(1, &parent->active_channels) == 1) {
582 for (i = 0; i < GS_MAX_RX_URBS; i++) {
583 struct urb *urb;
584 u8 *buf;
585
586
587 urb = usb_alloc_urb(0, GFP_KERNEL);
588 if (!urb)
589 return -ENOMEM;
590
591
592 buf = usb_alloc_coherent(dev->udev,
593 sizeof(struct gs_host_frame),
594 GFP_KERNEL,
595 &urb->transfer_dma);
596 if (!buf) {
597 netdev_err(netdev,
598 "No memory left for USB buffer\n");
599 usb_free_urb(urb);
600 return -ENOMEM;
601 }
602
603
604 usb_fill_bulk_urb(urb,
605 dev->udev,
606 usb_rcvbulkpipe(dev->udev,
607 GSUSB_ENDPOINT_IN),
608 buf,
609 sizeof(struct gs_host_frame),
610 gs_usb_receive_bulk_callback,
611 parent);
612 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
613
614 usb_anchor_urb(urb, &parent->rx_submitted);
615
616 rc = usb_submit_urb(urb, GFP_KERNEL);
617 if (rc) {
618 if (rc == -ENODEV)
619 netif_device_detach(dev->netdev);
620
621 netdev_err(netdev,
622 "usb_submit failed (err=%d)\n",
623 rc);
624
625 usb_unanchor_urb(urb);
626 break;
627 }
628
629
630
631
632 usb_free_urb(urb);
633 }
634 }
635
636 dm = kmalloc(sizeof(*dm), GFP_KERNEL);
637 if (!dm)
638 return -ENOMEM;
639
640
641 ctrlmode = dev->can.ctrlmode;
642 dm->flags = 0;
643
644 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
645 dm->flags |= GS_CAN_MODE_LOOP_BACK;
646 else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
647 dm->flags |= GS_CAN_MODE_LISTEN_ONLY;
648
649
650
651
652 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
653 dm->flags |= GS_CAN_MODE_ONE_SHOT;
654
655 if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
656 dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
657
658
659 dm->mode = GS_CAN_MODE_START;
660 rc = usb_control_msg(interface_to_usbdev(dev->iface),
661 usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
662 GS_USB_BREQ_MODE,
663 USB_DIR_OUT | USB_TYPE_VENDOR |
664 USB_RECIP_INTERFACE,
665 dev->channel,
666 0,
667 dm,
668 sizeof(*dm),
669 1000);
670
671 if (rc < 0) {
672 netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
673 kfree(dm);
674 return rc;
675 }
676
677 kfree(dm);
678
679 dev->can.state = CAN_STATE_ERROR_ACTIVE;
680
681 if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
682 netif_start_queue(netdev);
683
684 return 0;
685}
686
687static int gs_can_close(struct net_device *netdev)
688{
689 int rc;
690 struct gs_can *dev = netdev_priv(netdev);
691 struct gs_usb *parent = dev->parent;
692
693 netif_stop_queue(netdev);
694
695
696 if (atomic_dec_and_test(&parent->active_channels))
697 usb_kill_anchored_urbs(&parent->rx_submitted);
698
699
700 usb_kill_anchored_urbs(&dev->tx_submitted);
701 atomic_set(&dev->active_tx_urbs, 0);
702
703
704 rc = gs_cmd_reset(dev);
705 if (rc < 0)
706 netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
707
708
709 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
710 dev->tx_context[rc].dev = dev;
711 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
712 }
713
714
715 close_candev(netdev);
716
717 return 0;
718}
719
720static const struct net_device_ops gs_usb_netdev_ops = {
721 .ndo_open = gs_can_open,
722 .ndo_stop = gs_can_close,
723 .ndo_start_xmit = gs_can_start_xmit,
724 .ndo_change_mtu = can_change_mtu,
725};
726
727static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
728{
729 struct gs_can *dev = netdev_priv(netdev);
730 struct gs_identify_mode *imode;
731 int rc;
732
733 imode = kmalloc(sizeof(*imode), GFP_KERNEL);
734
735 if (!imode)
736 return -ENOMEM;
737
738 if (do_identify)
739 imode->mode = GS_CAN_IDENTIFY_ON;
740 else
741 imode->mode = GS_CAN_IDENTIFY_OFF;
742
743 rc = usb_control_msg(interface_to_usbdev(dev->iface),
744 usb_sndctrlpipe(interface_to_usbdev(dev->iface),
745 0),
746 GS_USB_BREQ_IDENTIFY,
747 USB_DIR_OUT | USB_TYPE_VENDOR |
748 USB_RECIP_INTERFACE,
749 dev->channel,
750 0,
751 imode,
752 sizeof(*imode),
753 100);
754
755 kfree(imode);
756
757 return (rc > 0) ? 0 : rc;
758}
759
760
761static int gs_usb_set_phys_id(struct net_device *dev,
762 enum ethtool_phys_id_state state)
763{
764 int rc = 0;
765
766 switch (state) {
767 case ETHTOOL_ID_ACTIVE:
768 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
769 break;
770 case ETHTOOL_ID_INACTIVE:
771 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
772 break;
773 default:
774 break;
775 }
776
777 return rc;
778}
779
780static const struct ethtool_ops gs_usb_ethtool_ops = {
781 .set_phys_id = gs_usb_set_phys_id,
782};
783
784static struct gs_can *gs_make_candev(unsigned int channel,
785 struct usb_interface *intf,
786 struct gs_device_config *dconf)
787{
788 struct gs_can *dev;
789 struct net_device *netdev;
790 int rc;
791 struct gs_device_bt_const *bt_const;
792
793 bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
794 if (!bt_const)
795 return ERR_PTR(-ENOMEM);
796
797
798 rc = usb_control_msg(interface_to_usbdev(intf),
799 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
800 GS_USB_BREQ_BT_CONST,
801 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
802 channel,
803 0,
804 bt_const,
805 sizeof(*bt_const),
806 1000);
807
808 if (rc < 0) {
809 dev_err(&intf->dev,
810 "Couldn't get bit timing const for channel (err=%d)\n",
811 rc);
812 kfree(bt_const);
813 return ERR_PTR(rc);
814 }
815
816
817 netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
818 if (!netdev) {
819 dev_err(&intf->dev, "Couldn't allocate candev\n");
820 kfree(bt_const);
821 return ERR_PTR(-ENOMEM);
822 }
823
824 dev = netdev_priv(netdev);
825
826 netdev->netdev_ops = &gs_usb_netdev_ops;
827
828 netdev->flags |= IFF_ECHO;
829
830
831 strcpy(dev->bt_const.name, "gs_usb");
832 dev->bt_const.tseg1_min = bt_const->tseg1_min;
833 dev->bt_const.tseg1_max = bt_const->tseg1_max;
834 dev->bt_const.tseg2_min = bt_const->tseg2_min;
835 dev->bt_const.tseg2_max = bt_const->tseg2_max;
836 dev->bt_const.sjw_max = bt_const->sjw_max;
837 dev->bt_const.brp_min = bt_const->brp_min;
838 dev->bt_const.brp_max = bt_const->brp_max;
839 dev->bt_const.brp_inc = bt_const->brp_inc;
840
841 dev->udev = interface_to_usbdev(intf);
842 dev->iface = intf;
843 dev->netdev = netdev;
844 dev->channel = channel;
845
846 init_usb_anchor(&dev->tx_submitted);
847 atomic_set(&dev->active_tx_urbs, 0);
848 spin_lock_init(&dev->tx_ctx_lock);
849 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
850 dev->tx_context[rc].dev = dev;
851 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
852 }
853
854
855 dev->can.state = CAN_STATE_STOPPED;
856 dev->can.clock.freq = bt_const->fclk_can;
857 dev->can.bittiming_const = &dev->bt_const;
858 dev->can.do_set_bittiming = gs_usb_set_bittiming;
859
860 dev->can.ctrlmode_supported = 0;
861
862 if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
863 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
864
865 if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
866 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
867
868 if (bt_const->feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
869 dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
870
871 if (bt_const->feature & GS_CAN_FEATURE_ONE_SHOT)
872 dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
873
874 SET_NETDEV_DEV(netdev, &intf->dev);
875
876 if (dconf->sw_version > 1)
877 if (bt_const->feature & GS_CAN_FEATURE_IDENTIFY)
878 netdev->ethtool_ops = &gs_usb_ethtool_ops;
879
880 kfree(bt_const);
881
882 rc = register_candev(dev->netdev);
883 if (rc) {
884 free_candev(dev->netdev);
885 dev_err(&intf->dev, "Couldn't register candev (err=%d)\n", rc);
886 return ERR_PTR(rc);
887 }
888
889 return dev;
890}
891
892static void gs_destroy_candev(struct gs_can *dev)
893{
894 unregister_candev(dev->netdev);
895 usb_kill_anchored_urbs(&dev->tx_submitted);
896 free_candev(dev->netdev);
897}
898
899static int gs_usb_probe(struct usb_interface *intf,
900 const struct usb_device_id *id)
901{
902 struct gs_usb *dev;
903 int rc = -ENOMEM;
904 unsigned int icount, i;
905 struct gs_host_config *hconf;
906 struct gs_device_config *dconf;
907
908 hconf = kmalloc(sizeof(*hconf), GFP_KERNEL);
909 if (!hconf)
910 return -ENOMEM;
911
912 hconf->byte_order = 0x0000beef;
913
914
915 rc = usb_control_msg(interface_to_usbdev(intf),
916 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
917 GS_USB_BREQ_HOST_FORMAT,
918 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
919 1,
920 intf->altsetting[0].desc.bInterfaceNumber,
921 hconf,
922 sizeof(*hconf),
923 1000);
924
925 kfree(hconf);
926
927 if (rc < 0) {
928 dev_err(&intf->dev, "Couldn't send data format (err=%d)\n",
929 rc);
930 return rc;
931 }
932
933 dconf = kmalloc(sizeof(*dconf), GFP_KERNEL);
934 if (!dconf)
935 return -ENOMEM;
936
937
938 rc = usb_control_msg(interface_to_usbdev(intf),
939 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
940 GS_USB_BREQ_DEVICE_CONFIG,
941 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
942 1,
943 intf->altsetting[0].desc.bInterfaceNumber,
944 dconf,
945 sizeof(*dconf),
946 1000);
947 if (rc < 0) {
948 dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
949 rc);
950 kfree(dconf);
951 return rc;
952 }
953
954 icount = dconf->icount + 1;
955 dev_info(&intf->dev, "Configuring for %d interfaces\n", icount);
956
957 if (icount > GS_MAX_INTF) {
958 dev_err(&intf->dev,
959 "Driver cannot handle more that %d CAN interfaces\n",
960 GS_MAX_INTF);
961 kfree(dconf);
962 return -EINVAL;
963 }
964
965 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
966 if (!dev) {
967 kfree(dconf);
968 return -ENOMEM;
969 }
970
971 init_usb_anchor(&dev->rx_submitted);
972
973 atomic_set(&dev->active_channels, 0);
974
975 usb_set_intfdata(intf, dev);
976 dev->udev = interface_to_usbdev(intf);
977
978 for (i = 0; i < icount; i++) {
979 dev->canch[i] = gs_make_candev(i, intf, dconf);
980 if (IS_ERR_OR_NULL(dev->canch[i])) {
981
982 rc = PTR_ERR(dev->canch[i]);
983
984
985 icount = i;
986 for (i = 0; i < icount; i++)
987 gs_destroy_candev(dev->canch[i]);
988
989 usb_kill_anchored_urbs(&dev->rx_submitted);
990 kfree(dconf);
991 kfree(dev);
992 return rc;
993 }
994 dev->canch[i]->parent = dev;
995 }
996
997 kfree(dconf);
998
999 return 0;
1000}
1001
1002static void gs_usb_disconnect(struct usb_interface *intf)
1003{
1004 unsigned i;
1005 struct gs_usb *dev = usb_get_intfdata(intf);
1006 usb_set_intfdata(intf, NULL);
1007
1008 if (!dev) {
1009 dev_err(&intf->dev, "Disconnect (nodata)\n");
1010 return;
1011 }
1012
1013 for (i = 0; i < GS_MAX_INTF; i++)
1014 if (dev->canch[i])
1015 gs_destroy_candev(dev->canch[i]);
1016
1017 usb_kill_anchored_urbs(&dev->rx_submitted);
1018 kfree(dev);
1019}
1020
1021static const struct usb_device_id gs_usb_table[] = {
1022 { USB_DEVICE_INTERFACE_NUMBER(USB_GSUSB_1_VENDOR_ID,
1023 USB_GSUSB_1_PRODUCT_ID, 0) },
1024 { USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
1025 USB_CANDLELIGHT_PRODUCT_ID, 0) },
1026 {}
1027};
1028
1029MODULE_DEVICE_TABLE(usb, gs_usb_table);
1030
1031static struct usb_driver gs_usb_driver = {
1032 .name = "gs_usb",
1033 .probe = gs_usb_probe,
1034 .disconnect = gs_usb_disconnect,
1035 .id_table = gs_usb_table,
1036};
1037
1038module_usb_driver(gs_usb_driver);
1039
1040MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
1041MODULE_DESCRIPTION(
1042"Socket CAN device driver for Geschwister Schneider Technologie-, "
1043"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
1044"and bytewerk.org candleLight USB CAN interfaces.");
1045MODULE_LICENSE("GPL v2");
1046
