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12#include <linux/ethtool.h>
13#include <linux/init.h>
14#include <linux/signal.h>
15#include <linux/module.h>
16#include <linux/netdevice.h>
17#include <linux/usb.h>
18
19#include <linux/can.h>
20#include <linux/can/dev.h>
21#include <linux/can/error.h>
22
23
24#define USB_GSUSB_1_VENDOR_ID 0x1d50
25#define USB_GSUSB_1_PRODUCT_ID 0x606f
26
27#define USB_CANDLELIGHT_VENDOR_ID 0x1209
28#define USB_CANDLELIGHT_PRODUCT_ID 0x2323
29
30#define GSUSB_ENDPOINT_IN 1
31#define GSUSB_ENDPOINT_OUT 2
32
33
34enum gs_usb_breq {
35 GS_USB_BREQ_HOST_FORMAT = 0,
36 GS_USB_BREQ_BITTIMING,
37 GS_USB_BREQ_MODE,
38 GS_USB_BREQ_BERR,
39 GS_USB_BREQ_BT_CONST,
40 GS_USB_BREQ_DEVICE_CONFIG,
41 GS_USB_BREQ_TIMESTAMP,
42 GS_USB_BREQ_IDENTIFY,
43};
44
45enum gs_can_mode {
46
47 GS_CAN_MODE_RESET = 0,
48
49 GS_CAN_MODE_START
50};
51
52enum gs_can_state {
53 GS_CAN_STATE_ERROR_ACTIVE = 0,
54 GS_CAN_STATE_ERROR_WARNING,
55 GS_CAN_STATE_ERROR_PASSIVE,
56 GS_CAN_STATE_BUS_OFF,
57 GS_CAN_STATE_STOPPED,
58 GS_CAN_STATE_SLEEPING
59};
60
61enum gs_can_identify_mode {
62 GS_CAN_IDENTIFY_OFF = 0,
63 GS_CAN_IDENTIFY_ON
64};
65
66
67
68
69
70
71
72
73
74
75
76
77struct gs_host_config {
78 __le32 byte_order;
79} __packed;
80
81struct gs_device_config {
82 u8 reserved1;
83 u8 reserved2;
84 u8 reserved3;
85 u8 icount;
86 __le32 sw_version;
87 __le32 hw_version;
88} __packed;
89
90#define GS_CAN_MODE_NORMAL 0
91#define GS_CAN_MODE_LISTEN_ONLY BIT(0)
92#define GS_CAN_MODE_LOOP_BACK BIT(1)
93#define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2)
94#define GS_CAN_MODE_ONE_SHOT BIT(3)
95
96struct gs_device_mode {
97 __le32 mode;
98 __le32 flags;
99} __packed;
100
101struct gs_device_state {
102 __le32 state;
103 __le32 rxerr;
104 __le32 txerr;
105} __packed;
106
107struct gs_device_bittiming {
108 __le32 prop_seg;
109 __le32 phase_seg1;
110 __le32 phase_seg2;
111 __le32 sjw;
112 __le32 brp;
113} __packed;
114
115struct gs_identify_mode {
116 __le32 mode;
117} __packed;
118
119#define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
120#define GS_CAN_FEATURE_LOOP_BACK BIT(1)
121#define GS_CAN_FEATURE_TRIPLE_SAMPLE BIT(2)
122#define GS_CAN_FEATURE_ONE_SHOT BIT(3)
123#define GS_CAN_FEATURE_HW_TIMESTAMP BIT(4)
124#define GS_CAN_FEATURE_IDENTIFY BIT(5)
125
126struct gs_device_bt_const {
127 __le32 feature;
128 __le32 fclk_can;
129 __le32 tseg1_min;
130 __le32 tseg1_max;
131 __le32 tseg2_min;
132 __le32 tseg2_max;
133 __le32 sjw_max;
134 __le32 brp_min;
135 __le32 brp_max;
136 __le32 brp_inc;
137} __packed;
138
139#define GS_CAN_FLAG_OVERFLOW 1
140
141struct gs_host_frame {
142 u32 echo_id;
143 __le32 can_id;
144
145 u8 can_dlc;
146 u8 channel;
147 u8 flags;
148 u8 reserved;
149
150 u8 data[8];
151} __packed;
152
153
154
155
156
157#define GS_MAX_TX_URBS 10
158
159#define GS_MAX_RX_URBS 30
160
161
162
163#define GS_MAX_INTF 2
164
165struct gs_tx_context {
166 struct gs_can *dev;
167 unsigned int echo_id;
168};
169
170struct gs_can {
171 struct can_priv can;
172
173 struct gs_usb *parent;
174
175 struct net_device *netdev;
176 struct usb_device *udev;
177 struct usb_interface *iface;
178
179 struct can_bittiming_const bt_const;
180 unsigned int channel;
181
182
183 spinlock_t tx_ctx_lock;
184 struct gs_tx_context tx_context[GS_MAX_TX_URBS];
185
186 struct usb_anchor tx_submitted;
187 atomic_t active_tx_urbs;
188};
189
190
191struct gs_usb {
192 struct gs_can *canch[GS_MAX_INTF];
193 struct usb_anchor rx_submitted;
194 atomic_t active_channels;
195 struct usb_device *udev;
196};
197
198
199
200
201static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
202{
203 int i = 0;
204 unsigned long flags;
205
206 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
207
208 for (; i < GS_MAX_TX_URBS; i++) {
209 if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
210 dev->tx_context[i].echo_id = i;
211 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
212 return &dev->tx_context[i];
213 }
214 }
215
216 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
217 return NULL;
218}
219
220
221
222static void gs_free_tx_context(struct gs_tx_context *txc)
223{
224 txc->echo_id = GS_MAX_TX_URBS;
225}
226
227
228
229static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
230 unsigned int id)
231{
232 unsigned long flags;
233
234 if (id < GS_MAX_TX_URBS) {
235 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
236 if (dev->tx_context[id].echo_id == id) {
237 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
238 return &dev->tx_context[id];
239 }
240 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
241 }
242 return NULL;
243}
244
245static int gs_cmd_reset(struct gs_can *gsdev)
246{
247 struct gs_device_mode *dm;
248 struct usb_interface *intf = gsdev->iface;
249 int rc;
250
251 dm = kzalloc(sizeof(*dm), GFP_KERNEL);
252 if (!dm)
253 return -ENOMEM;
254
255 dm->mode = GS_CAN_MODE_RESET;
256
257 rc = usb_control_msg(interface_to_usbdev(intf),
258 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
259 GS_USB_BREQ_MODE,
260 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
261 gsdev->channel,
262 0,
263 dm,
264 sizeof(*dm),
265 1000);
266
267 kfree(dm);
268
269 return rc;
270}
271
272static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
273{
274 struct can_device_stats *can_stats = &dev->can.can_stats;
275
276 if (cf->can_id & CAN_ERR_RESTARTED) {
277 dev->can.state = CAN_STATE_ERROR_ACTIVE;
278 can_stats->restarts++;
279 } else if (cf->can_id & CAN_ERR_BUSOFF) {
280 dev->can.state = CAN_STATE_BUS_OFF;
281 can_stats->bus_off++;
282 } else if (cf->can_id & CAN_ERR_CRTL) {
283 if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
284 (cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
285 dev->can.state = CAN_STATE_ERROR_WARNING;
286 can_stats->error_warning++;
287 } else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
288 (cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
289 dev->can.state = CAN_STATE_ERROR_PASSIVE;
290 can_stats->error_passive++;
291 } else {
292 dev->can.state = CAN_STATE_ERROR_ACTIVE;
293 }
294 }
295}
296
297static void gs_usb_receive_bulk_callback(struct urb *urb)
298{
299 struct gs_usb *usbcan = urb->context;
300 struct gs_can *dev;
301 struct net_device *netdev;
302 int rc;
303 struct net_device_stats *stats;
304 struct gs_host_frame *hf = urb->transfer_buffer;
305 struct gs_tx_context *txc;
306 struct can_frame *cf;
307 struct sk_buff *skb;
308
309 BUG_ON(!usbcan);
310
311 switch (urb->status) {
312 case 0:
313 break;
314 case -ENOENT:
315 case -ESHUTDOWN:
316 return;
317 default:
318
319 return;
320 }
321
322
323 if (hf->channel >= GS_MAX_INTF)
324 goto resubmit_urb;
325
326 dev = usbcan->canch[hf->channel];
327
328 netdev = dev->netdev;
329 stats = &netdev->stats;
330
331 if (!netif_device_present(netdev))
332 return;
333
334 if (hf->echo_id == -1) {
335 skb = alloc_can_skb(dev->netdev, &cf);
336 if (!skb)
337 return;
338
339 cf->can_id = le32_to_cpu(hf->can_id);
340
341 can_frame_set_cc_len(cf, hf->can_dlc, dev->can.ctrlmode);
342 memcpy(cf->data, hf->data, 8);
343
344
345 if (le32_to_cpu(hf->can_id) & CAN_ERR_FLAG)
346 gs_update_state(dev, cf);
347
348 netdev->stats.rx_packets++;
349 netdev->stats.rx_bytes += hf->can_dlc;
350
351 netif_rx(skb);
352 } else {
353 if (hf->echo_id >= GS_MAX_TX_URBS) {
354 netdev_err(netdev,
355 "Unexpected out of range echo id %d\n",
356 hf->echo_id);
357 goto resubmit_urb;
358 }
359
360 netdev->stats.tx_packets++;
361 netdev->stats.tx_bytes += hf->can_dlc;
362
363 txc = gs_get_tx_context(dev, hf->echo_id);
364
365
366 if (!txc) {
367 netdev_err(netdev,
368 "Unexpected unused echo id %d\n",
369 hf->echo_id);
370 goto resubmit_urb;
371 }
372
373 can_get_echo_skb(netdev, hf->echo_id, NULL);
374
375 gs_free_tx_context(txc);
376
377 atomic_dec(&dev->active_tx_urbs);
378
379 netif_wake_queue(netdev);
380 }
381
382 if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
383 skb = alloc_can_err_skb(netdev, &cf);
384 if (!skb)
385 goto resubmit_urb;
386
387 cf->can_id |= CAN_ERR_CRTL;
388 cf->len = CAN_ERR_DLC;
389 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
390 stats->rx_over_errors++;
391 stats->rx_errors++;
392 netif_rx(skb);
393 }
394
395 resubmit_urb:
396 usb_fill_bulk_urb(urb,
397 usbcan->udev,
398 usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
399 hf,
400 sizeof(struct gs_host_frame),
401 gs_usb_receive_bulk_callback,
402 usbcan
403 );
404
405 rc = usb_submit_urb(urb, GFP_ATOMIC);
406
407
408 if (rc == -ENODEV) {
409 for (rc = 0; rc < GS_MAX_INTF; rc++) {
410 if (usbcan->canch[rc])
411 netif_device_detach(usbcan->canch[rc]->netdev);
412 }
413 }
414}
415
416static int gs_usb_set_bittiming(struct net_device *netdev)
417{
418 struct gs_can *dev = netdev_priv(netdev);
419 struct can_bittiming *bt = &dev->can.bittiming;
420 struct usb_interface *intf = dev->iface;
421 int rc;
422 struct gs_device_bittiming *dbt;
423
424 dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
425 if (!dbt)
426 return -ENOMEM;
427
428 dbt->prop_seg = cpu_to_le32(bt->prop_seg);
429 dbt->phase_seg1 = cpu_to_le32(bt->phase_seg1);
430 dbt->phase_seg2 = cpu_to_le32(bt->phase_seg2);
431 dbt->sjw = cpu_to_le32(bt->sjw);
432 dbt->brp = cpu_to_le32(bt->brp);
433
434
435 rc = usb_control_msg(interface_to_usbdev(intf),
436 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
437 GS_USB_BREQ_BITTIMING,
438 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
439 dev->channel,
440 0,
441 dbt,
442 sizeof(*dbt),
443 1000);
444
445 kfree(dbt);
446
447 if (rc < 0)
448 dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
449 rc);
450
451 return (rc > 0) ? 0 : rc;
452}
453
454static void gs_usb_xmit_callback(struct urb *urb)
455{
456 struct gs_tx_context *txc = urb->context;
457 struct gs_can *dev = txc->dev;
458 struct net_device *netdev = dev->netdev;
459
460 if (urb->status)
461 netdev_info(netdev, "usb xmit fail %d\n", txc->echo_id);
462
463 usb_free_coherent(urb->dev,
464 urb->transfer_buffer_length,
465 urb->transfer_buffer,
466 urb->transfer_dma);
467}
468
469static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
470 struct net_device *netdev)
471{
472 struct gs_can *dev = netdev_priv(netdev);
473 struct net_device_stats *stats = &dev->netdev->stats;
474 struct urb *urb;
475 struct gs_host_frame *hf;
476 struct can_frame *cf;
477 int rc;
478 unsigned int idx;
479 struct gs_tx_context *txc;
480
481 if (can_dropped_invalid_skb(netdev, skb))
482 return NETDEV_TX_OK;
483
484
485 txc = gs_alloc_tx_context(dev);
486 if (!txc)
487 return NETDEV_TX_BUSY;
488
489
490 urb = usb_alloc_urb(0, GFP_ATOMIC);
491 if (!urb)
492 goto nomem_urb;
493
494 hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
495 &urb->transfer_dma);
496 if (!hf) {
497 netdev_err(netdev, "No memory left for USB buffer\n");
498 goto nomem_hf;
499 }
500
501 idx = txc->echo_id;
502
503 if (idx >= GS_MAX_TX_URBS) {
504 netdev_err(netdev, "Invalid tx context %d\n", idx);
505 goto badidx;
506 }
507
508 hf->echo_id = idx;
509 hf->channel = dev->channel;
510
511 cf = (struct can_frame *)skb->data;
512
513 hf->can_id = cpu_to_le32(cf->can_id);
514 hf->can_dlc = can_get_cc_dlc(cf, dev->can.ctrlmode);
515
516 memcpy(hf->data, cf->data, cf->len);
517
518 usb_fill_bulk_urb(urb, dev->udev,
519 usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
520 hf,
521 sizeof(*hf),
522 gs_usb_xmit_callback,
523 txc);
524
525 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
526 usb_anchor_urb(urb, &dev->tx_submitted);
527
528 can_put_echo_skb(skb, netdev, idx, 0);
529
530 atomic_inc(&dev->active_tx_urbs);
531
532 rc = usb_submit_urb(urb, GFP_ATOMIC);
533 if (unlikely(rc)) {
534 atomic_dec(&dev->active_tx_urbs);
535
536 can_free_echo_skb(netdev, idx, NULL);
537 gs_free_tx_context(txc);
538
539 usb_unanchor_urb(urb);
540 usb_free_coherent(dev->udev,
541 sizeof(*hf),
542 hf,
543 urb->transfer_dma);
544
545 if (rc == -ENODEV) {
546 netif_device_detach(netdev);
547 } else {
548 netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
549 stats->tx_dropped++;
550 }
551 } else {
552
553 if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
554 netif_stop_queue(netdev);
555 }
556
557
558 usb_free_urb(urb);
559
560 return NETDEV_TX_OK;
561
562 badidx:
563 usb_free_coherent(dev->udev,
564 sizeof(*hf),
565 hf,
566 urb->transfer_dma);
567 nomem_hf:
568 usb_free_urb(urb);
569
570 nomem_urb:
571 gs_free_tx_context(txc);
572 dev_kfree_skb(skb);
573 stats->tx_dropped++;
574 return NETDEV_TX_OK;
575}
576
577static int gs_can_open(struct net_device *netdev)
578{
579 struct gs_can *dev = netdev_priv(netdev);
580 struct gs_usb *parent = dev->parent;
581 int rc, i;
582 struct gs_device_mode *dm;
583 u32 ctrlmode;
584 u32 flags = 0;
585
586 rc = open_candev(netdev);
587 if (rc)
588 return rc;
589
590 if (atomic_add_return(1, &parent->active_channels) == 1) {
591 for (i = 0; i < GS_MAX_RX_URBS; i++) {
592 struct urb *urb;
593 u8 *buf;
594
595
596 urb = usb_alloc_urb(0, GFP_KERNEL);
597 if (!urb)
598 return -ENOMEM;
599
600
601 buf = usb_alloc_coherent(dev->udev,
602 sizeof(struct gs_host_frame),
603 GFP_KERNEL,
604 &urb->transfer_dma);
605 if (!buf) {
606 netdev_err(netdev,
607 "No memory left for USB buffer\n");
608 usb_free_urb(urb);
609 return -ENOMEM;
610 }
611
612
613 usb_fill_bulk_urb(urb,
614 dev->udev,
615 usb_rcvbulkpipe(dev->udev,
616 GSUSB_ENDPOINT_IN),
617 buf,
618 sizeof(struct gs_host_frame),
619 gs_usb_receive_bulk_callback,
620 parent);
621 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
622
623 usb_anchor_urb(urb, &parent->rx_submitted);
624
625 rc = usb_submit_urb(urb, GFP_KERNEL);
626 if (rc) {
627 if (rc == -ENODEV)
628 netif_device_detach(dev->netdev);
629
630 netdev_err(netdev,
631 "usb_submit failed (err=%d)\n",
632 rc);
633
634 usb_unanchor_urb(urb);
635 usb_free_urb(urb);
636 break;
637 }
638
639
640
641
642 usb_free_urb(urb);
643 }
644 }
645
646 dm = kmalloc(sizeof(*dm), GFP_KERNEL);
647 if (!dm)
648 return -ENOMEM;
649
650
651 ctrlmode = dev->can.ctrlmode;
652
653 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
654 flags |= GS_CAN_MODE_LOOP_BACK;
655 else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
656 flags |= GS_CAN_MODE_LISTEN_ONLY;
657
658
659
660
661 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
662 flags |= GS_CAN_MODE_ONE_SHOT;
663
664 if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
665 flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
666
667
668 dm->mode = cpu_to_le32(GS_CAN_MODE_START);
669 dm->flags = cpu_to_le32(flags);
670 rc = usb_control_msg(interface_to_usbdev(dev->iface),
671 usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
672 GS_USB_BREQ_MODE,
673 USB_DIR_OUT | USB_TYPE_VENDOR |
674 USB_RECIP_INTERFACE,
675 dev->channel,
676 0,
677 dm,
678 sizeof(*dm),
679 1000);
680
681 if (rc < 0) {
682 netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
683 kfree(dm);
684 return rc;
685 }
686
687 kfree(dm);
688
689 dev->can.state = CAN_STATE_ERROR_ACTIVE;
690
691 if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
692 netif_start_queue(netdev);
693
694 return 0;
695}
696
697static int gs_can_close(struct net_device *netdev)
698{
699 int rc;
700 struct gs_can *dev = netdev_priv(netdev);
701 struct gs_usb *parent = dev->parent;
702
703 netif_stop_queue(netdev);
704
705
706 if (atomic_dec_and_test(&parent->active_channels))
707 usb_kill_anchored_urbs(&parent->rx_submitted);
708
709
710 usb_kill_anchored_urbs(&dev->tx_submitted);
711 atomic_set(&dev->active_tx_urbs, 0);
712
713
714 rc = gs_cmd_reset(dev);
715 if (rc < 0)
716 netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
717
718
719 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
720 dev->tx_context[rc].dev = dev;
721 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
722 }
723
724
725 close_candev(netdev);
726
727 return 0;
728}
729
730static const struct net_device_ops gs_usb_netdev_ops = {
731 .ndo_open = gs_can_open,
732 .ndo_stop = gs_can_close,
733 .ndo_start_xmit = gs_can_start_xmit,
734 .ndo_change_mtu = can_change_mtu,
735};
736
737static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
738{
739 struct gs_can *dev = netdev_priv(netdev);
740 struct gs_identify_mode *imode;
741 int rc;
742
743 imode = kmalloc(sizeof(*imode), GFP_KERNEL);
744
745 if (!imode)
746 return -ENOMEM;
747
748 if (do_identify)
749 imode->mode = cpu_to_le32(GS_CAN_IDENTIFY_ON);
750 else
751 imode->mode = cpu_to_le32(GS_CAN_IDENTIFY_OFF);
752
753 rc = usb_control_msg(interface_to_usbdev(dev->iface),
754 usb_sndctrlpipe(interface_to_usbdev(dev->iface),
755 0),
756 GS_USB_BREQ_IDENTIFY,
757 USB_DIR_OUT | USB_TYPE_VENDOR |
758 USB_RECIP_INTERFACE,
759 dev->channel,
760 0,
761 imode,
762 sizeof(*imode),
763 100);
764
765 kfree(imode);
766
767 return (rc > 0) ? 0 : rc;
768}
769
770
771static int gs_usb_set_phys_id(struct net_device *dev,
772 enum ethtool_phys_id_state state)
773{
774 int rc = 0;
775
776 switch (state) {
777 case ETHTOOL_ID_ACTIVE:
778 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
779 break;
780 case ETHTOOL_ID_INACTIVE:
781 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
782 break;
783 default:
784 break;
785 }
786
787 return rc;
788}
789
790static const struct ethtool_ops gs_usb_ethtool_ops = {
791 .set_phys_id = gs_usb_set_phys_id,
792};
793
794static struct gs_can *gs_make_candev(unsigned int channel,
795 struct usb_interface *intf,
796 struct gs_device_config *dconf)
797{
798 struct gs_can *dev;
799 struct net_device *netdev;
800 int rc;
801 struct gs_device_bt_const *bt_const;
802 u32 feature;
803
804 bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
805 if (!bt_const)
806 return ERR_PTR(-ENOMEM);
807
808
809 rc = usb_control_msg(interface_to_usbdev(intf),
810 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
811 GS_USB_BREQ_BT_CONST,
812 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
813 channel,
814 0,
815 bt_const,
816 sizeof(*bt_const),
817 1000);
818
819 if (rc < 0) {
820 dev_err(&intf->dev,
821 "Couldn't get bit timing const for channel (err=%d)\n",
822 rc);
823 kfree(bt_const);
824 return ERR_PTR(rc);
825 }
826
827
828 netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
829 if (!netdev) {
830 dev_err(&intf->dev, "Couldn't allocate candev\n");
831 kfree(bt_const);
832 return ERR_PTR(-ENOMEM);
833 }
834
835 dev = netdev_priv(netdev);
836
837 netdev->netdev_ops = &gs_usb_netdev_ops;
838
839 netdev->flags |= IFF_ECHO;
840
841
842 strcpy(dev->bt_const.name, "gs_usb");
843 dev->bt_const.tseg1_min = le32_to_cpu(bt_const->tseg1_min);
844 dev->bt_const.tseg1_max = le32_to_cpu(bt_const->tseg1_max);
845 dev->bt_const.tseg2_min = le32_to_cpu(bt_const->tseg2_min);
846 dev->bt_const.tseg2_max = le32_to_cpu(bt_const->tseg2_max);
847 dev->bt_const.sjw_max = le32_to_cpu(bt_const->sjw_max);
848 dev->bt_const.brp_min = le32_to_cpu(bt_const->brp_min);
849 dev->bt_const.brp_max = le32_to_cpu(bt_const->brp_max);
850 dev->bt_const.brp_inc = le32_to_cpu(bt_const->brp_inc);
851
852 dev->udev = interface_to_usbdev(intf);
853 dev->iface = intf;
854 dev->netdev = netdev;
855 dev->channel = channel;
856
857 init_usb_anchor(&dev->tx_submitted);
858 atomic_set(&dev->active_tx_urbs, 0);
859 spin_lock_init(&dev->tx_ctx_lock);
860 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
861 dev->tx_context[rc].dev = dev;
862 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
863 }
864
865
866 dev->can.state = CAN_STATE_STOPPED;
867 dev->can.clock.freq = le32_to_cpu(bt_const->fclk_can);
868 dev->can.bittiming_const = &dev->bt_const;
869 dev->can.do_set_bittiming = gs_usb_set_bittiming;
870
871 dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
872
873 feature = le32_to_cpu(bt_const->feature);
874 if (feature & GS_CAN_FEATURE_LISTEN_ONLY)
875 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
876
877 if (feature & GS_CAN_FEATURE_LOOP_BACK)
878 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
879
880 if (feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
881 dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
882
883 if (feature & GS_CAN_FEATURE_ONE_SHOT)
884 dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
885
886 SET_NETDEV_DEV(netdev, &intf->dev);
887
888 if (le32_to_cpu(dconf->sw_version) > 1)
889 if (feature & GS_CAN_FEATURE_IDENTIFY)
890 netdev->ethtool_ops = &gs_usb_ethtool_ops;
891
892 kfree(bt_const);
893
894 rc = register_candev(dev->netdev);
895 if (rc) {
896 free_candev(dev->netdev);
897 dev_err(&intf->dev, "Couldn't register candev (err=%d)\n", rc);
898 return ERR_PTR(rc);
899 }
900
901 return dev;
902}
903
904static void gs_destroy_candev(struct gs_can *dev)
905{
906 unregister_candev(dev->netdev);
907 usb_kill_anchored_urbs(&dev->tx_submitted);
908 free_candev(dev->netdev);
909}
910
911static int gs_usb_probe(struct usb_interface *intf,
912 const struct usb_device_id *id)
913{
914 struct gs_usb *dev;
915 int rc = -ENOMEM;
916 unsigned int icount, i;
917 struct gs_host_config *hconf;
918 struct gs_device_config *dconf;
919
920 hconf = kmalloc(sizeof(*hconf), GFP_KERNEL);
921 if (!hconf)
922 return -ENOMEM;
923
924 hconf->byte_order = cpu_to_le32(0x0000beef);
925
926
927 rc = usb_control_msg(interface_to_usbdev(intf),
928 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
929 GS_USB_BREQ_HOST_FORMAT,
930 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
931 1,
932 intf->cur_altsetting->desc.bInterfaceNumber,
933 hconf,
934 sizeof(*hconf),
935 1000);
936
937 kfree(hconf);
938
939 if (rc < 0) {
940 dev_err(&intf->dev, "Couldn't send data format (err=%d)\n",
941 rc);
942 return rc;
943 }
944
945 dconf = kmalloc(sizeof(*dconf), GFP_KERNEL);
946 if (!dconf)
947 return -ENOMEM;
948
949
950 rc = usb_control_msg(interface_to_usbdev(intf),
951 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
952 GS_USB_BREQ_DEVICE_CONFIG,
953 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
954 1,
955 intf->cur_altsetting->desc.bInterfaceNumber,
956 dconf,
957 sizeof(*dconf),
958 1000);
959 if (rc < 0) {
960 dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
961 rc);
962 kfree(dconf);
963 return rc;
964 }
965
966 icount = dconf->icount + 1;
967 dev_info(&intf->dev, "Configuring for %d interfaces\n", icount);
968
969 if (icount > GS_MAX_INTF) {
970 dev_err(&intf->dev,
971 "Driver cannot handle more that %d CAN interfaces\n",
972 GS_MAX_INTF);
973 kfree(dconf);
974 return -EINVAL;
975 }
976
977 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
978 if (!dev) {
979 kfree(dconf);
980 return -ENOMEM;
981 }
982
983 init_usb_anchor(&dev->rx_submitted);
984
985 atomic_set(&dev->active_channels, 0);
986
987 usb_set_intfdata(intf, dev);
988 dev->udev = interface_to_usbdev(intf);
989
990 for (i = 0; i < icount; i++) {
991 dev->canch[i] = gs_make_candev(i, intf, dconf);
992 if (IS_ERR_OR_NULL(dev->canch[i])) {
993
994 rc = PTR_ERR(dev->canch[i]);
995
996
997 icount = i;
998 for (i = 0; i < icount; i++)
999 gs_destroy_candev(dev->canch[i]);
1000
1001 usb_kill_anchored_urbs(&dev->rx_submitted);
1002 kfree(dconf);
1003 kfree(dev);
1004 return rc;
1005 }
1006 dev->canch[i]->parent = dev;
1007 }
1008
1009 kfree(dconf);
1010
1011 return 0;
1012}
1013
1014static void gs_usb_disconnect(struct usb_interface *intf)
1015{
1016 unsigned i;
1017 struct gs_usb *dev = usb_get_intfdata(intf);
1018 usb_set_intfdata(intf, NULL);
1019
1020 if (!dev) {
1021 dev_err(&intf->dev, "Disconnect (nodata)\n");
1022 return;
1023 }
1024
1025 for (i = 0; i < GS_MAX_INTF; i++)
1026 if (dev->canch[i])
1027 gs_destroy_candev(dev->canch[i]);
1028
1029 usb_kill_anchored_urbs(&dev->rx_submitted);
1030 kfree(dev);
1031}
1032
1033static const struct usb_device_id gs_usb_table[] = {
1034 { USB_DEVICE_INTERFACE_NUMBER(USB_GSUSB_1_VENDOR_ID,
1035 USB_GSUSB_1_PRODUCT_ID, 0) },
1036 { USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
1037 USB_CANDLELIGHT_PRODUCT_ID, 0) },
1038 {}
1039};
1040
1041MODULE_DEVICE_TABLE(usb, gs_usb_table);
1042
1043static struct usb_driver gs_usb_driver = {
1044 .name = "gs_usb",
1045 .probe = gs_usb_probe,
1046 .disconnect = gs_usb_disconnect,
1047 .id_table = gs_usb_table,
1048};
1049
1050module_usb_driver(gs_usb_driver);
1051
1052MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
1053MODULE_DESCRIPTION(
1054"Socket CAN device driver for Geschwister Schneider Technologie-, "
1055"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
1056"and bytewerk.org candleLight USB CAN interfaces.");
1057MODULE_LICENSE("GPL v2");
1058
