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1/*
2 * CAN driver for esd CAN-USB/2 and CAN-USB/Micro
3 *
4 * Copyright (C) 2010-2012 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; version 2 of the License.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19#include <linux/signal.h>
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/netdevice.h>
23#include <linux/usb.h>
24
25#include <linux/can.h>
26#include <linux/can/dev.h>
27#include <linux/can/error.h>
28
29MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
30MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
31MODULE_LICENSE("GPL v2");
32
33/* Define these values to match your devices */
34#define USB_ESDGMBH_VENDOR_ID 0x0ab4
35#define USB_CANUSB2_PRODUCT_ID 0x0010
36#define USB_CANUSBM_PRODUCT_ID 0x0011
37
38#define ESD_USB2_CAN_CLOCK 60000000
39#define ESD_USBM_CAN_CLOCK 36000000
40#define ESD_USB2_MAX_NETS 2
41
42/* USB2 commands */
43#define CMD_VERSION 1 /* also used for VERSION_REPLY */
44#define CMD_CAN_RX 2 /* device to host only */
45#define CMD_CAN_TX 3 /* also used for TX_DONE */
46#define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */
47#define CMD_TS 5 /* also used for TS_REPLY */
48#define CMD_IDADD 6 /* also used for IDADD_REPLY */
49
50/* esd CAN message flags - dlc field */
51#define ESD_RTR 0x10
52
53/* esd CAN message flags - id field */
54#define ESD_EXTID 0x20000000
55#define ESD_EVENT 0x40000000
56#define ESD_IDMASK 0x1fffffff
57
58/* esd CAN event ids used by this driver */
59#define ESD_EV_CAN_ERROR_EXT 2
60
61/* baudrate message flags */
62#define ESD_USB2_UBR 0x80000000
63#define ESD_USB2_LOM 0x40000000
64#define ESD_USB2_NO_BAUDRATE 0x7fffffff
65#define ESD_USB2_TSEG1_MIN 1
66#define ESD_USB2_TSEG1_MAX 16
67#define ESD_USB2_TSEG1_SHIFT 16
68#define ESD_USB2_TSEG2_MIN 1
69#define ESD_USB2_TSEG2_MAX 8
70#define ESD_USB2_TSEG2_SHIFT 20
71#define ESD_USB2_SJW_MAX 4
72#define ESD_USB2_SJW_SHIFT 14
73#define ESD_USBM_SJW_SHIFT 24
74#define ESD_USB2_BRP_MIN 1
75#define ESD_USB2_BRP_MAX 1024
76#define ESD_USB2_BRP_INC 1
77#define ESD_USB2_3_SAMPLES 0x00800000
78
79/* esd IDADD message */
80#define ESD_ID_ENABLE 0x80
81#define ESD_MAX_ID_SEGMENT 64
82
83/* SJA1000 ECC register (emulated by usb2 firmware) */
84#define SJA1000_ECC_SEG 0x1F
85#define SJA1000_ECC_DIR 0x20
86#define SJA1000_ECC_ERR 0x06
87#define SJA1000_ECC_BIT 0x00
88#define SJA1000_ECC_FORM 0x40
89#define SJA1000_ECC_STUFF 0x80
90#define SJA1000_ECC_MASK 0xc0
91
92/* esd bus state event codes */
93#define ESD_BUSSTATE_MASK 0xc0
94#define ESD_BUSSTATE_WARN 0x40
95#define ESD_BUSSTATE_ERRPASSIVE 0x80
96#define ESD_BUSSTATE_BUSOFF 0xc0
97
98#define RX_BUFFER_SIZE 1024
99#define MAX_RX_URBS 4
100#define MAX_TX_URBS 16 /* must be power of 2 */
101
102struct header_msg {
103 u8 len; /* len is always the total message length in 32bit words */
104 u8 cmd;
105 u8 rsvd[2];
106};
107
108struct version_msg {
109 u8 len;
110 u8 cmd;
111 u8 rsvd;
112 u8 flags;
113 __le32 drv_version;
114};
115
116struct version_reply_msg {
117 u8 len;
118 u8 cmd;
119 u8 nets;
120 u8 features;
121 __le32 version;
122 u8 name[16];
123 __le32 rsvd;
124 __le32 ts;
125};
126
127struct rx_msg {
128 u8 len;
129 u8 cmd;
130 u8 net;
131 u8 dlc;
132 __le32 ts;
133 __le32 id; /* upper 3 bits contain flags */
134 u8 data[8];
135};
136
137struct tx_msg {
138 u8 len;
139 u8 cmd;
140 u8 net;
141 u8 dlc;
142 u32 hnd; /* opaque handle, not used by device */
143 __le32 id; /* upper 3 bits contain flags */
144 u8 data[8];
145};
146
147struct tx_done_msg {
148 u8 len;
149 u8 cmd;
150 u8 net;
151 u8 status;
152 u32 hnd; /* opaque handle, not used by device */
153 __le32 ts;
154};
155
156struct id_filter_msg {
157 u8 len;
158 u8 cmd;
159 u8 net;
160 u8 option;
161 __le32 mask[ESD_MAX_ID_SEGMENT + 1];
162};
163
164struct set_baudrate_msg {
165 u8 len;
166 u8 cmd;
167 u8 net;
168 u8 rsvd;
169 __le32 baud;
170};
171
172/* Main message type used between library and application */
173struct __attribute__ ((packed)) esd_usb2_msg {
174 union {
175 struct header_msg hdr;
176 struct version_msg version;
177 struct version_reply_msg version_reply;
178 struct rx_msg rx;
179 struct tx_msg tx;
180 struct tx_done_msg txdone;
181 struct set_baudrate_msg setbaud;
182 struct id_filter_msg filter;
183 } msg;
184};
185
186static struct usb_device_id esd_usb2_table[] = {
187 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
188 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)},
189 {}
190};
191MODULE_DEVICE_TABLE(usb, esd_usb2_table);
192
193struct esd_usb2_net_priv;
194
195struct esd_tx_urb_context {
196 struct esd_usb2_net_priv *priv;
197 u32 echo_index;
198 int dlc;
199};
200
201struct esd_usb2 {
202 struct usb_device *udev;
203 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
204
205 struct usb_anchor rx_submitted;
206
207 int net_count;
208 u32 version;
209 int rxinitdone;
210};
211
212struct esd_usb2_net_priv {
213 struct can_priv can; /* must be the first member */
214
215 atomic_t active_tx_jobs;
216 struct usb_anchor tx_submitted;
217 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
218
219 struct esd_usb2 *usb2;
220 struct net_device *netdev;
221 int index;
222 u8 old_state;
223 struct can_berr_counter bec;
224};
225
226static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
227 struct esd_usb2_msg *msg)
228{
229 struct net_device_stats *stats = &priv->netdev->stats;
230 struct can_frame *cf;
231 struct sk_buff *skb;
232 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
233
234 if (id == ESD_EV_CAN_ERROR_EXT) {
235 u8 state = msg->msg.rx.data[0];
236 u8 ecc = msg->msg.rx.data[1];
237 u8 txerr = msg->msg.rx.data[2];
238 u8 rxerr = msg->msg.rx.data[3];
239
240 skb = alloc_can_err_skb(priv->netdev, &cf);
241 if (skb == NULL) {
242 stats->rx_dropped++;
243 return;
244 }
245
246 if (state != priv->old_state) {
247 priv->old_state = state;
248
249 switch (state & ESD_BUSSTATE_MASK) {
250 case ESD_BUSSTATE_BUSOFF:
251 priv->can.state = CAN_STATE_BUS_OFF;
252 cf->can_id |= CAN_ERR_BUSOFF;
253 priv->can.can_stats.bus_off++;
254 can_bus_off(priv->netdev);
255 break;
256 case ESD_BUSSTATE_WARN:
257 priv->can.state = CAN_STATE_ERROR_WARNING;
258 priv->can.can_stats.error_warning++;
259 break;
260 case ESD_BUSSTATE_ERRPASSIVE:
261 priv->can.state = CAN_STATE_ERROR_PASSIVE;
262 priv->can.can_stats.error_passive++;
263 break;
264 default:
265 priv->can.state = CAN_STATE_ERROR_ACTIVE;
266 break;
267 }
268 } else {
269 priv->can.can_stats.bus_error++;
270 stats->rx_errors++;
271
272 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
273
274 switch (ecc & SJA1000_ECC_MASK) {
275 case SJA1000_ECC_BIT:
276 cf->data[2] |= CAN_ERR_PROT_BIT;
277 break;
278 case SJA1000_ECC_FORM:
279 cf->data[2] |= CAN_ERR_PROT_FORM;
280 break;
281 case SJA1000_ECC_STUFF:
282 cf->data[2] |= CAN_ERR_PROT_STUFF;
283 break;
284 default:
285 cf->data[3] = ecc & SJA1000_ECC_SEG;
286 break;
287 }
288
289 /* Error occurred during transmission? */
290 if (!(ecc & SJA1000_ECC_DIR))
291 cf->data[2] |= CAN_ERR_PROT_TX;
292
293 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
294 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
295 cf->data[1] = (txerr > rxerr) ?
296 CAN_ERR_CRTL_TX_PASSIVE :
297 CAN_ERR_CRTL_RX_PASSIVE;
298 }
299 cf->data[6] = txerr;
300 cf->data[7] = rxerr;
301 }
302
303 priv->bec.txerr = txerr;
304 priv->bec.rxerr = rxerr;
305
306 stats->rx_packets++;
307 stats->rx_bytes += cf->can_dlc;
308 netif_rx(skb);
309 }
310}
311
312static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
313 struct esd_usb2_msg *msg)
314{
315 struct net_device_stats *stats = &priv->netdev->stats;
316 struct can_frame *cf;
317 struct sk_buff *skb;
318 int i;
319 u32 id;
320
321 if (!netif_device_present(priv->netdev))
322 return;
323
324 id = le32_to_cpu(msg->msg.rx.id);
325
326 if (id & ESD_EVENT) {
327 esd_usb2_rx_event(priv, msg);
328 } else {
329 skb = alloc_can_skb(priv->netdev, &cf);
330 if (skb == NULL) {
331 stats->rx_dropped++;
332 return;
333 }
334
335 cf->can_id = id & ESD_IDMASK;
336 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
337
338 if (id & ESD_EXTID)
339 cf->can_id |= CAN_EFF_FLAG;
340
341 if (msg->msg.rx.dlc & ESD_RTR) {
342 cf->can_id |= CAN_RTR_FLAG;
343 } else {
344 for (i = 0; i < cf->can_dlc; i++)
345 cf->data[i] = msg->msg.rx.data[i];
346 }
347
348 stats->rx_packets++;
349 stats->rx_bytes += cf->can_dlc;
350 netif_rx(skb);
351 }
352
353 return;
354}
355
356static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
357 struct esd_usb2_msg *msg)
358{
359 struct net_device_stats *stats = &priv->netdev->stats;
360 struct net_device *netdev = priv->netdev;
361 struct esd_tx_urb_context *context;
362
363 if (!netif_device_present(netdev))
364 return;
365
366 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
367
368 if (!msg->msg.txdone.status) {
369 stats->tx_packets++;
370 stats->tx_bytes += context->dlc;
371 can_get_echo_skb(netdev, context->echo_index);
372 } else {
373 stats->tx_errors++;
374 can_free_echo_skb(netdev, context->echo_index);
375 }
376
377 /* Release context */
378 context->echo_index = MAX_TX_URBS;
379 atomic_dec(&priv->active_tx_jobs);
380
381 netif_wake_queue(netdev);
382}
383
384static void esd_usb2_read_bulk_callback(struct urb *urb)
385{
386 struct esd_usb2 *dev = urb->context;
387 int retval;
388 int pos = 0;
389 int i;
390
391 switch (urb->status) {
392 case 0: /* success */
393 break;
394
395 case -ENOENT:
396 case -ESHUTDOWN:
397 return;
398
399 default:
400 dev_info(dev->udev->dev.parent,
401 "Rx URB aborted (%d)\n", urb->status);
402 goto resubmit_urb;
403 }
404
405 while (pos < urb->actual_length) {
406 struct esd_usb2_msg *msg;
407
408 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
409
410 switch (msg->msg.hdr.cmd) {
411 case CMD_CAN_RX:
412 if (msg->msg.rx.net >= dev->net_count) {
413 dev_err(dev->udev->dev.parent, "format error\n");
414 break;
415 }
416
417 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
418 break;
419
420 case CMD_CAN_TX:
421 if (msg->msg.txdone.net >= dev->net_count) {
422 dev_err(dev->udev->dev.parent, "format error\n");
423 break;
424 }
425
426 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
427 msg);
428 break;
429 }
430
431 pos += msg->msg.hdr.len << 2;
432
433 if (pos > urb->actual_length) {
434 dev_err(dev->udev->dev.parent, "format error\n");
435 break;
436 }
437 }
438
439resubmit_urb:
440 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
441 urb->transfer_buffer, RX_BUFFER_SIZE,
442 esd_usb2_read_bulk_callback, dev);
443
444 retval = usb_submit_urb(urb, GFP_ATOMIC);
445 if (retval == -ENODEV) {
446 for (i = 0; i < dev->net_count; i++) {
447 if (dev->nets[i])
448 netif_device_detach(dev->nets[i]->netdev);
449 }
450 } else if (retval) {
451 dev_err(dev->udev->dev.parent,
452 "failed resubmitting read bulk urb: %d\n", retval);
453 }
454
455 return;
456}
457
458/*
459 * callback for bulk IN urb
460 */
461static void esd_usb2_write_bulk_callback(struct urb *urb)
462{
463 struct esd_tx_urb_context *context = urb->context;
464 struct esd_usb2_net_priv *priv;
465 struct net_device *netdev;
466 size_t size = sizeof(struct esd_usb2_msg);
467
468 WARN_ON(!context);
469
470 priv = context->priv;
471 netdev = priv->netdev;
472
473 /* free up our allocated buffer */
474 usb_free_coherent(urb->dev, size,
475 urb->transfer_buffer, urb->transfer_dma);
476
477 if (!netif_device_present(netdev))
478 return;
479
480 if (urb->status)
481 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
482
483 netif_trans_update(netdev);
484}
485
486static ssize_t show_firmware(struct device *d,
487 struct device_attribute *attr, char *buf)
488{
489 struct usb_interface *intf = to_usb_interface(d);
490 struct esd_usb2 *dev = usb_get_intfdata(intf);
491
492 return sprintf(buf, "%d.%d.%d\n",
493 (dev->version >> 12) & 0xf,
494 (dev->version >> 8) & 0xf,
495 dev->version & 0xff);
496}
497static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
498
499static ssize_t show_hardware(struct device *d,
500 struct device_attribute *attr, char *buf)
501{
502 struct usb_interface *intf = to_usb_interface(d);
503 struct esd_usb2 *dev = usb_get_intfdata(intf);
504
505 return sprintf(buf, "%d.%d.%d\n",
506 (dev->version >> 28) & 0xf,
507 (dev->version >> 24) & 0xf,
508 (dev->version >> 16) & 0xff);
509}
510static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
511
512static ssize_t show_nets(struct device *d,
513 struct device_attribute *attr, char *buf)
514{
515 struct usb_interface *intf = to_usb_interface(d);
516 struct esd_usb2 *dev = usb_get_intfdata(intf);
517
518 return sprintf(buf, "%d", dev->net_count);
519}
520static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
521
522static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
523{
524 int actual_length;
525
526 return usb_bulk_msg(dev->udev,
527 usb_sndbulkpipe(dev->udev, 2),
528 msg,
529 msg->msg.hdr.len << 2,
530 &actual_length,
531 1000);
532}
533
534static int esd_usb2_wait_msg(struct esd_usb2 *dev,
535 struct esd_usb2_msg *msg)
536{
537 int actual_length;
538
539 return usb_bulk_msg(dev->udev,
540 usb_rcvbulkpipe(dev->udev, 1),
541 msg,
542 sizeof(*msg),
543 &actual_length,
544 1000);
545}
546
547static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
548{
549 int i, err = 0;
550
551 if (dev->rxinitdone)
552 return 0;
553
554 for (i = 0; i < MAX_RX_URBS; i++) {
555 struct urb *urb = NULL;
556 u8 *buf = NULL;
557
558 /* create a URB, and a buffer for it */
559 urb = usb_alloc_urb(0, GFP_KERNEL);
560 if (!urb) {
561 err = -ENOMEM;
562 break;
563 }
564
565 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
566 &urb->transfer_dma);
567 if (!buf) {
568 dev_warn(dev->udev->dev.parent,
569 "No memory left for USB buffer\n");
570 err = -ENOMEM;
571 goto freeurb;
572 }
573
574 usb_fill_bulk_urb(urb, dev->udev,
575 usb_rcvbulkpipe(dev->udev, 1),
576 buf, RX_BUFFER_SIZE,
577 esd_usb2_read_bulk_callback, dev);
578 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
579 usb_anchor_urb(urb, &dev->rx_submitted);
580
581 err = usb_submit_urb(urb, GFP_KERNEL);
582 if (err) {
583 usb_unanchor_urb(urb);
584 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
585 urb->transfer_dma);
586 }
587
588freeurb:
589 /* Drop reference, USB core will take care of freeing it */
590 usb_free_urb(urb);
591 if (err)
592 break;
593 }
594
595 /* Did we submit any URBs */
596 if (i == 0) {
597 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
598 return err;
599 }
600
601 /* Warn if we've couldn't transmit all the URBs */
602 if (i < MAX_RX_URBS) {
603 dev_warn(dev->udev->dev.parent,
604 "rx performance may be slow\n");
605 }
606
607 dev->rxinitdone = 1;
608 return 0;
609}
610
611/*
612 * Start interface
613 */
614static int esd_usb2_start(struct esd_usb2_net_priv *priv)
615{
616 struct esd_usb2 *dev = priv->usb2;
617 struct net_device *netdev = priv->netdev;
618 struct esd_usb2_msg *msg;
619 int err, i;
620
621 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
622 if (!msg) {
623 err = -ENOMEM;
624 goto out;
625 }
626
627 /*
628 * Enable all IDs
629 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
630 * Each bit represents one 11 bit CAN identifier. A set bit
631 * enables reception of the corresponding CAN identifier. A cleared
632 * bit disabled this identifier. An additional bitmask value
633 * following the CAN 2.0A bits is used to enable reception of
634 * extended CAN frames. Only the LSB of this final mask is checked
635 * for the complete 29 bit ID range. The IDADD message also allows
636 * filter configuration for an ID subset. In this case you can add
637 * the number of the starting bitmask (0..64) to the filter.option
638 * field followed by only some bitmasks.
639 */
640 msg->msg.hdr.cmd = CMD_IDADD;
641 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
642 msg->msg.filter.net = priv->index;
643 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
644 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
645 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
646 /* enable 29bit extended IDs */
647 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
648
649 err = esd_usb2_send_msg(dev, msg);
650 if (err)
651 goto out;
652
653 err = esd_usb2_setup_rx_urbs(dev);
654 if (err)
655 goto out;
656
657 priv->can.state = CAN_STATE_ERROR_ACTIVE;
658
659out:
660 if (err == -ENODEV)
661 netif_device_detach(netdev);
662 if (err)
663 netdev_err(netdev, "couldn't start device: %d\n", err);
664
665 kfree(msg);
666 return err;
667}
668
669static void unlink_all_urbs(struct esd_usb2 *dev)
670{
671 struct esd_usb2_net_priv *priv;
672 int i, j;
673
674 usb_kill_anchored_urbs(&dev->rx_submitted);
675 for (i = 0; i < dev->net_count; i++) {
676 priv = dev->nets[i];
677 if (priv) {
678 usb_kill_anchored_urbs(&priv->tx_submitted);
679 atomic_set(&priv->active_tx_jobs, 0);
680
681 for (j = 0; j < MAX_TX_URBS; j++)
682 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
683 }
684 }
685}
686
687static int esd_usb2_open(struct net_device *netdev)
688{
689 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
690 int err;
691
692 /* common open */
693 err = open_candev(netdev);
694 if (err)
695 return err;
696
697 /* finally start device */
698 err = esd_usb2_start(priv);
699 if (err) {
700 netdev_warn(netdev, "couldn't start device: %d\n", err);
701 close_candev(netdev);
702 return err;
703 }
704
705 netif_start_queue(netdev);
706
707 return 0;
708}
709
710static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
711 struct net_device *netdev)
712{
713 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
714 struct esd_usb2 *dev = priv->usb2;
715 struct esd_tx_urb_context *context = NULL;
716 struct net_device_stats *stats = &netdev->stats;
717 struct can_frame *cf = (struct can_frame *)skb->data;
718 struct esd_usb2_msg *msg;
719 struct urb *urb;
720 u8 *buf;
721 int i, err;
722 int ret = NETDEV_TX_OK;
723 size_t size = sizeof(struct esd_usb2_msg);
724
725 if (can_dropped_invalid_skb(netdev, skb))
726 return NETDEV_TX_OK;
727
728 /* create a URB, and a buffer for it, and copy the data to the URB */
729 urb = usb_alloc_urb(0, GFP_ATOMIC);
730 if (!urb) {
731 stats->tx_dropped++;
732 dev_kfree_skb(skb);
733 goto nourbmem;
734 }
735
736 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
737 &urb->transfer_dma);
738 if (!buf) {
739 netdev_err(netdev, "No memory left for USB buffer\n");
740 stats->tx_dropped++;
741 dev_kfree_skb(skb);
742 goto nobufmem;
743 }
744
745 msg = (struct esd_usb2_msg *)buf;
746
747 msg->msg.hdr.len = 3; /* minimal length */
748 msg->msg.hdr.cmd = CMD_CAN_TX;
749 msg->msg.tx.net = priv->index;
750 msg->msg.tx.dlc = cf->can_dlc;
751 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
752
753 if (cf->can_id & CAN_RTR_FLAG)
754 msg->msg.tx.dlc |= ESD_RTR;
755
756 if (cf->can_id & CAN_EFF_FLAG)
757 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
758
759 for (i = 0; i < cf->can_dlc; i++)
760 msg->msg.tx.data[i] = cf->data[i];
761
762 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
763
764 for (i = 0; i < MAX_TX_URBS; i++) {
765 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
766 context = &priv->tx_contexts[i];
767 break;
768 }
769 }
770
771 /*
772 * This may never happen.
773 */
774 if (!context) {
775 netdev_warn(netdev, "couldn't find free context\n");
776 ret = NETDEV_TX_BUSY;
777 goto releasebuf;
778 }
779
780 context->priv = priv;
781 context->echo_index = i;
782 context->dlc = cf->can_dlc;
783
784 /* hnd must not be 0 - MSB is stripped in txdone handling */
785 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
786
787 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
788 msg->msg.hdr.len << 2,
789 esd_usb2_write_bulk_callback, context);
790
791 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
792
793 usb_anchor_urb(urb, &priv->tx_submitted);
794
795 can_put_echo_skb(skb, netdev, context->echo_index);
796
797 atomic_inc(&priv->active_tx_jobs);
798
799 /* Slow down tx path */
800 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
801 netif_stop_queue(netdev);
802
803 err = usb_submit_urb(urb, GFP_ATOMIC);
804 if (err) {
805 can_free_echo_skb(netdev, context->echo_index);
806
807 atomic_dec(&priv->active_tx_jobs);
808 usb_unanchor_urb(urb);
809
810 stats->tx_dropped++;
811
812 if (err == -ENODEV)
813 netif_device_detach(netdev);
814 else
815 netdev_warn(netdev, "failed tx_urb %d\n", err);
816
817 goto releasebuf;
818 }
819
820 netif_trans_update(netdev);
821
822 /*
823 * Release our reference to this URB, the USB core will eventually free
824 * it entirely.
825 */
826 usb_free_urb(urb);
827
828 return NETDEV_TX_OK;
829
830releasebuf:
831 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
832
833nobufmem:
834 usb_free_urb(urb);
835
836nourbmem:
837 return ret;
838}
839
840static int esd_usb2_close(struct net_device *netdev)
841{
842 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
843 struct esd_usb2_msg *msg;
844 int i;
845
846 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
847 if (!msg)
848 return -ENOMEM;
849
850 /* Disable all IDs (see esd_usb2_start()) */
851 msg->msg.hdr.cmd = CMD_IDADD;
852 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
853 msg->msg.filter.net = priv->index;
854 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
855 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
856 msg->msg.filter.mask[i] = 0;
857 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
858 netdev_err(netdev, "sending idadd message failed\n");
859
860 /* set CAN controller to reset mode */
861 msg->msg.hdr.len = 2;
862 msg->msg.hdr.cmd = CMD_SETBAUD;
863 msg->msg.setbaud.net = priv->index;
864 msg->msg.setbaud.rsvd = 0;
865 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
866 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
867 netdev_err(netdev, "sending setbaud message failed\n");
868
869 priv->can.state = CAN_STATE_STOPPED;
870
871 netif_stop_queue(netdev);
872
873 close_candev(netdev);
874
875 kfree(msg);
876
877 return 0;
878}
879
880static const struct net_device_ops esd_usb2_netdev_ops = {
881 .ndo_open = esd_usb2_open,
882 .ndo_stop = esd_usb2_close,
883 .ndo_start_xmit = esd_usb2_start_xmit,
884 .ndo_change_mtu = can_change_mtu,
885};
886
887static const struct can_bittiming_const esd_usb2_bittiming_const = {
888 .name = "esd_usb2",
889 .tseg1_min = ESD_USB2_TSEG1_MIN,
890 .tseg1_max = ESD_USB2_TSEG1_MAX,
891 .tseg2_min = ESD_USB2_TSEG2_MIN,
892 .tseg2_max = ESD_USB2_TSEG2_MAX,
893 .sjw_max = ESD_USB2_SJW_MAX,
894 .brp_min = ESD_USB2_BRP_MIN,
895 .brp_max = ESD_USB2_BRP_MAX,
896 .brp_inc = ESD_USB2_BRP_INC,
897};
898
899static int esd_usb2_set_bittiming(struct net_device *netdev)
900{
901 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
902 struct can_bittiming *bt = &priv->can.bittiming;
903 struct esd_usb2_msg *msg;
904 int err;
905 u32 canbtr;
906 int sjw_shift;
907
908 canbtr = ESD_USB2_UBR;
909 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
910 canbtr |= ESD_USB2_LOM;
911
912 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
913
914 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
915 USB_CANUSBM_PRODUCT_ID)
916 sjw_shift = ESD_USBM_SJW_SHIFT;
917 else
918 sjw_shift = ESD_USB2_SJW_SHIFT;
919
920 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
921 << sjw_shift;
922 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
923 & (ESD_USB2_TSEG1_MAX - 1))
924 << ESD_USB2_TSEG1_SHIFT;
925 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
926 << ESD_USB2_TSEG2_SHIFT;
927 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
928 canbtr |= ESD_USB2_3_SAMPLES;
929
930 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
931 if (!msg)
932 return -ENOMEM;
933
934 msg->msg.hdr.len = 2;
935 msg->msg.hdr.cmd = CMD_SETBAUD;
936 msg->msg.setbaud.net = priv->index;
937 msg->msg.setbaud.rsvd = 0;
938 msg->msg.setbaud.baud = cpu_to_le32(canbtr);
939
940 netdev_info(netdev, "setting BTR=%#x\n", canbtr);
941
942 err = esd_usb2_send_msg(priv->usb2, msg);
943
944 kfree(msg);
945 return err;
946}
947
948static int esd_usb2_get_berr_counter(const struct net_device *netdev,
949 struct can_berr_counter *bec)
950{
951 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
952
953 bec->txerr = priv->bec.txerr;
954 bec->rxerr = priv->bec.rxerr;
955
956 return 0;
957}
958
959static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
960{
961 switch (mode) {
962 case CAN_MODE_START:
963 netif_wake_queue(netdev);
964 break;
965
966 default:
967 return -EOPNOTSUPP;
968 }
969
970 return 0;
971}
972
973static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
974{
975 struct esd_usb2 *dev = usb_get_intfdata(intf);
976 struct net_device *netdev;
977 struct esd_usb2_net_priv *priv;
978 int err = 0;
979 int i;
980
981 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
982 if (!netdev) {
983 dev_err(&intf->dev, "couldn't alloc candev\n");
984 err = -ENOMEM;
985 goto done;
986 }
987
988 priv = netdev_priv(netdev);
989
990 init_usb_anchor(&priv->tx_submitted);
991 atomic_set(&priv->active_tx_jobs, 0);
992
993 for (i = 0; i < MAX_TX_URBS; i++)
994 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
995
996 priv->usb2 = dev;
997 priv->netdev = netdev;
998 priv->index = index;
999
1000 priv->can.state = CAN_STATE_STOPPED;
1001 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1002
1003 if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1004 USB_CANUSBM_PRODUCT_ID)
1005 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1006 else {
1007 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1008 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1009 }
1010
1011 priv->can.bittiming_const = &esd_usb2_bittiming_const;
1012 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1013 priv->can.do_set_mode = esd_usb2_set_mode;
1014 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1015
1016 netdev->flags |= IFF_ECHO; /* we support local echo */
1017
1018 netdev->netdev_ops = &esd_usb2_netdev_ops;
1019
1020 SET_NETDEV_DEV(netdev, &intf->dev);
1021 netdev->dev_id = index;
1022
1023 err = register_candev(netdev);
1024 if (err) {
1025 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1026 free_candev(netdev);
1027 err = -ENOMEM;
1028 goto done;
1029 }
1030
1031 dev->nets[index] = priv;
1032 netdev_info(netdev, "device %s registered\n", netdev->name);
1033
1034done:
1035 return err;
1036}
1037
1038/*
1039 * probe function for new USB2 devices
1040 *
1041 * check version information and number of available
1042 * CAN interfaces
1043 */
1044static int esd_usb2_probe(struct usb_interface *intf,
1045 const struct usb_device_id *id)
1046{
1047 struct esd_usb2 *dev;
1048 struct esd_usb2_msg *msg;
1049 int i, err;
1050
1051 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1052 if (!dev) {
1053 err = -ENOMEM;
1054 goto done;
1055 }
1056
1057 dev->udev = interface_to_usbdev(intf);
1058
1059 init_usb_anchor(&dev->rx_submitted);
1060
1061 usb_set_intfdata(intf, dev);
1062
1063 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1064 if (!msg) {
1065 err = -ENOMEM;
1066 goto free_msg;
1067 }
1068
1069 /* query number of CAN interfaces (nets) */
1070 msg->msg.hdr.cmd = CMD_VERSION;
1071 msg->msg.hdr.len = 2;
1072 msg->msg.version.rsvd = 0;
1073 msg->msg.version.flags = 0;
1074 msg->msg.version.drv_version = 0;
1075
1076 err = esd_usb2_send_msg(dev, msg);
1077 if (err < 0) {
1078 dev_err(&intf->dev, "sending version message failed\n");
1079 goto free_msg;
1080 }
1081
1082 err = esd_usb2_wait_msg(dev, msg);
1083 if (err < 0) {
1084 dev_err(&intf->dev, "no version message answer\n");
1085 goto free_msg;
1086 }
1087
1088 dev->net_count = (int)msg->msg.version_reply.nets;
1089 dev->version = le32_to_cpu(msg->msg.version_reply.version);
1090
1091 if (device_create_file(&intf->dev, &dev_attr_firmware))
1092 dev_err(&intf->dev,
1093 "Couldn't create device file for firmware\n");
1094
1095 if (device_create_file(&intf->dev, &dev_attr_hardware))
1096 dev_err(&intf->dev,
1097 "Couldn't create device file for hardware\n");
1098
1099 if (device_create_file(&intf->dev, &dev_attr_nets))
1100 dev_err(&intf->dev,
1101 "Couldn't create device file for nets\n");
1102
1103 /* do per device probing */
1104 for (i = 0; i < dev->net_count; i++)
1105 esd_usb2_probe_one_net(intf, i);
1106
1107free_msg:
1108 kfree(msg);
1109 if (err)
1110 kfree(dev);
1111done:
1112 return err;
1113}
1114
1115/*
1116 * called by the usb core when the device is removed from the system
1117 */
1118static void esd_usb2_disconnect(struct usb_interface *intf)
1119{
1120 struct esd_usb2 *dev = usb_get_intfdata(intf);
1121 struct net_device *netdev;
1122 int i;
1123
1124 device_remove_file(&intf->dev, &dev_attr_firmware);
1125 device_remove_file(&intf->dev, &dev_attr_hardware);
1126 device_remove_file(&intf->dev, &dev_attr_nets);
1127
1128 usb_set_intfdata(intf, NULL);
1129
1130 if (dev) {
1131 for (i = 0; i < dev->net_count; i++) {
1132 if (dev->nets[i]) {
1133 netdev = dev->nets[i]->netdev;
1134 unregister_netdev(netdev);
1135 free_candev(netdev);
1136 }
1137 }
1138 unlink_all_urbs(dev);
1139 kfree(dev);
1140 }
1141}
1142
1143/* usb specific object needed to register this driver with the usb subsystem */
1144static struct usb_driver esd_usb2_driver = {
1145 .name = "esd_usb2",
1146 .probe = esd_usb2_probe,
1147 .disconnect = esd_usb2_disconnect,
1148 .id_table = esd_usb2_table,
1149};
1150
1151module_usb_driver(esd_usb2_driver);