1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * CAN driver for esd CAN-USB/2 and CAN-USB/Micro
4 *
5 * Copyright (C) 2010-2012 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
6 */
7 #include <linux/signal.h>
8 #include <linux/slab.h>
9 #include <linux/module.h>
10 #include <linux/netdevice.h>
11 #include <linux/usb.h>
12
13 #include <linux/can.h>
14 #include <linux/can/dev.h>
15 #include <linux/can/error.h>
16
17 MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
18 MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
19 MODULE_LICENSE("GPL v2");
20
21 /* Define these values to match your devices */
22 #define USB_ESDGMBH_VENDOR_ID 0x0ab4
23 #define USB_CANUSB2_PRODUCT_ID 0x0010
24 #define USB_CANUSBM_PRODUCT_ID 0x0011
25
26 #define ESD_USB2_CAN_CLOCK 60000000
27 #define ESD_USBM_CAN_CLOCK 36000000
28 #define ESD_USB2_MAX_NETS 2
29
30 /* USB2 commands */
31 #define CMD_VERSION 1 /* also used for VERSION_REPLY */
32 #define CMD_CAN_RX 2 /* device to host only */
33 #define CMD_CAN_TX 3 /* also used for TX_DONE */
34 #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */
35 #define CMD_TS 5 /* also used for TS_REPLY */
36 #define CMD_IDADD 6 /* also used for IDADD_REPLY */
37
38 /* esd CAN message flags - dlc field */
39 #define ESD_RTR 0x10
40
41 /* esd CAN message flags - id field */
42 #define ESD_EXTID 0x20000000
43 #define ESD_EVENT 0x40000000
44 #define ESD_IDMASK 0x1fffffff
45
46 /* esd CAN event ids used by this driver */
47 #define ESD_EV_CAN_ERROR_EXT 2
48
49 /* baudrate message flags */
50 #define ESD_USB2_UBR 0x80000000
51 #define ESD_USB2_LOM 0x40000000
52 #define ESD_USB2_NO_BAUDRATE 0x7fffffff
53 #define ESD_USB2_TSEG1_MIN 1
54 #define ESD_USB2_TSEG1_MAX 16
55 #define ESD_USB2_TSEG1_SHIFT 16
56 #define ESD_USB2_TSEG2_MIN 1
57 #define ESD_USB2_TSEG2_MAX 8
58 #define ESD_USB2_TSEG2_SHIFT 20
59 #define ESD_USB2_SJW_MAX 4
60 #define ESD_USB2_SJW_SHIFT 14
61 #define ESD_USBM_SJW_SHIFT 24
62 #define ESD_USB2_BRP_MIN 1
63 #define ESD_USB2_BRP_MAX 1024
64 #define ESD_USB2_BRP_INC 1
65 #define ESD_USB2_3_SAMPLES 0x00800000
66
67 /* esd IDADD message */
68 #define ESD_ID_ENABLE 0x80
69 #define ESD_MAX_ID_SEGMENT 64
70
71 /* SJA1000 ECC register (emulated by usb2 firmware) */
72 #define SJA1000_ECC_SEG 0x1F
73 #define SJA1000_ECC_DIR 0x20
74 #define SJA1000_ECC_ERR 0x06
75 #define SJA1000_ECC_BIT 0x00
76 #define SJA1000_ECC_FORM 0x40
77 #define SJA1000_ECC_STUFF 0x80
78 #define SJA1000_ECC_MASK 0xc0
79
80 /* esd bus state event codes */
81 #define ESD_BUSSTATE_MASK 0xc0
82 #define ESD_BUSSTATE_WARN 0x40
83 #define ESD_BUSSTATE_ERRPASSIVE 0x80
84 #define ESD_BUSSTATE_BUSOFF 0xc0
85
86 #define RX_BUFFER_SIZE 1024
87 #define MAX_RX_URBS 4
88 #define MAX_TX_URBS 16 /* must be power of 2 */
89
90 struct header_msg {
91 u8 len; /* len is always the total message length in 32bit words */
92 u8 cmd;
93 u8 rsvd[2];
94 };
95
96 struct version_msg {
97 u8 len;
98 u8 cmd;
99 u8 rsvd;
100 u8 flags;
101 __le32 drv_version;
102 };
103
104 struct version_reply_msg {
105 u8 len;
106 u8 cmd;
107 u8 nets;
108 u8 features;
109 __le32 version;
110 u8 name[16];
111 __le32 rsvd;
112 __le32 ts;
113 };
114
115 struct rx_msg {
116 u8 len;
117 u8 cmd;
118 u8 net;
119 u8 dlc;
120 __le32 ts;
121 __le32 id; /* upper 3 bits contain flags */
122 u8 data[8];
123 };
124
125 struct tx_msg {
126 u8 len;
127 u8 cmd;
128 u8 net;
129 u8 dlc;
130 u32 hnd; /* opaque handle, not used by device */
131 __le32 id; /* upper 3 bits contain flags */
132 u8 data[8];
133 };
134
135 struct tx_done_msg {
136 u8 len;
137 u8 cmd;
138 u8 net;
139 u8 status;
140 u32 hnd; /* opaque handle, not used by device */
141 __le32 ts;
142 };
143
144 struct id_filter_msg {
145 u8 len;
146 u8 cmd;
147 u8 net;
148 u8 option;
149 __le32 mask[ESD_MAX_ID_SEGMENT + 1];
150 };
151
152 struct set_baudrate_msg {
153 u8 len;
154 u8 cmd;
155 u8 net;
156 u8 rsvd;
157 __le32 baud;
158 };
159
160 /* Main message type used between library and application */
161 struct __attribute__ ((packed)) esd_usb2_msg {
162 union {
163 struct header_msg hdr;
164 struct version_msg version;
165 struct version_reply_msg version_reply;
166 struct rx_msg rx;
167 struct tx_msg tx;
168 struct tx_done_msg txdone;
169 struct set_baudrate_msg setbaud;
170 struct id_filter_msg filter;
171 } msg;
172 };
173
174 static struct usb_device_id esd_usb2_table[] = {
175 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
176 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)},
177 {}
178 };
179 MODULE_DEVICE_TABLE(usb, esd_usb2_table);
180
181 struct esd_usb2_net_priv;
182
183 struct esd_tx_urb_context {
184 struct esd_usb2_net_priv *priv;
185 u32 echo_index;
186 int dlc;
187 };
188
189 struct esd_usb2 {
190 struct usb_device *udev;
191 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
192
193 struct usb_anchor rx_submitted;
194
195 int net_count;
196 u32 version;
197 int rxinitdone;
198 void *rxbuf[MAX_RX_URBS];
199 dma_addr_t rxbuf_dma[MAX_RX_URBS];
200 };
201
202 struct esd_usb2_net_priv {
203 struct can_priv can; /* must be the first member */
204
205 atomic_t active_tx_jobs;
206 struct usb_anchor tx_submitted;
207 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
208
209 struct esd_usb2 *usb2;
210 struct net_device *netdev;
211 int index;
212 u8 old_state;
213 struct can_berr_counter bec;
214 };
215
esd_usb2_rx_event(struct esd_usb2_net_priv * priv,struct esd_usb2_msg * msg)216 static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
217 struct esd_usb2_msg *msg)
218 {
219 struct net_device_stats *stats = &priv->netdev->stats;
220 struct can_frame *cf;
221 struct sk_buff *skb;
222 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
223
224 if (id == ESD_EV_CAN_ERROR_EXT) {
225 u8 state = msg->msg.rx.data[0];
226 u8 ecc = msg->msg.rx.data[1];
227 u8 rxerr = msg->msg.rx.data[2];
228 u8 txerr = msg->msg.rx.data[3];
229
230 skb = alloc_can_err_skb(priv->netdev, &cf);
231 if (skb == NULL) {
232 stats->rx_dropped++;
233 return;
234 }
235
236 if (state != priv->old_state) {
237 priv->old_state = state;
238
239 switch (state & ESD_BUSSTATE_MASK) {
240 case ESD_BUSSTATE_BUSOFF:
241 priv->can.state = CAN_STATE_BUS_OFF;
242 cf->can_id |= CAN_ERR_BUSOFF;
243 priv->can.can_stats.bus_off++;
244 can_bus_off(priv->netdev);
245 break;
246 case ESD_BUSSTATE_WARN:
247 priv->can.state = CAN_STATE_ERROR_WARNING;
248 priv->can.can_stats.error_warning++;
249 break;
250 case ESD_BUSSTATE_ERRPASSIVE:
251 priv->can.state = CAN_STATE_ERROR_PASSIVE;
252 priv->can.can_stats.error_passive++;
253 break;
254 default:
255 priv->can.state = CAN_STATE_ERROR_ACTIVE;
256 break;
257 }
258 } else {
259 priv->can.can_stats.bus_error++;
260 stats->rx_errors++;
261
262 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
263
264 switch (ecc & SJA1000_ECC_MASK) {
265 case SJA1000_ECC_BIT:
266 cf->data[2] |= CAN_ERR_PROT_BIT;
267 break;
268 case SJA1000_ECC_FORM:
269 cf->data[2] |= CAN_ERR_PROT_FORM;
270 break;
271 case SJA1000_ECC_STUFF:
272 cf->data[2] |= CAN_ERR_PROT_STUFF;
273 break;
274 default:
275 cf->data[3] = ecc & SJA1000_ECC_SEG;
276 break;
277 }
278
279 /* Error occurred during transmission? */
280 if (!(ecc & SJA1000_ECC_DIR))
281 cf->data[2] |= CAN_ERR_PROT_TX;
282
283 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
284 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
285 cf->data[1] = (txerr > rxerr) ?
286 CAN_ERR_CRTL_TX_PASSIVE :
287 CAN_ERR_CRTL_RX_PASSIVE;
288 }
289 cf->data[6] = txerr;
290 cf->data[7] = rxerr;
291 }
292
293 priv->bec.txerr = txerr;
294 priv->bec.rxerr = rxerr;
295
296 stats->rx_packets++;
297 stats->rx_bytes += cf->can_dlc;
298 netif_rx(skb);
299 }
300 }
301
esd_usb2_rx_can_msg(struct esd_usb2_net_priv * priv,struct esd_usb2_msg * msg)302 static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
303 struct esd_usb2_msg *msg)
304 {
305 struct net_device_stats *stats = &priv->netdev->stats;
306 struct can_frame *cf;
307 struct sk_buff *skb;
308 int i;
309 u32 id;
310
311 if (!netif_device_present(priv->netdev))
312 return;
313
314 id = le32_to_cpu(msg->msg.rx.id);
315
316 if (id & ESD_EVENT) {
317 esd_usb2_rx_event(priv, msg);
318 } else {
319 skb = alloc_can_skb(priv->netdev, &cf);
320 if (skb == NULL) {
321 stats->rx_dropped++;
322 return;
323 }
324
325 cf->can_id = id & ESD_IDMASK;
326 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR);
327
328 if (id & ESD_EXTID)
329 cf->can_id |= CAN_EFF_FLAG;
330
331 if (msg->msg.rx.dlc & ESD_RTR) {
332 cf->can_id |= CAN_RTR_FLAG;
333 } else {
334 for (i = 0; i < cf->can_dlc; i++)
335 cf->data[i] = msg->msg.rx.data[i];
336 }
337
338 stats->rx_packets++;
339 stats->rx_bytes += cf->can_dlc;
340 netif_rx(skb);
341 }
342
343 return;
344 }
345
esd_usb2_tx_done_msg(struct esd_usb2_net_priv * priv,struct esd_usb2_msg * msg)346 static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
347 struct esd_usb2_msg *msg)
348 {
349 struct net_device_stats *stats = &priv->netdev->stats;
350 struct net_device *netdev = priv->netdev;
351 struct esd_tx_urb_context *context;
352
353 if (!netif_device_present(netdev))
354 return;
355
356 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
357
358 if (!msg->msg.txdone.status) {
359 stats->tx_packets++;
360 stats->tx_bytes += context->dlc;
361 can_get_echo_skb(netdev, context->echo_index);
362 } else {
363 stats->tx_errors++;
364 can_free_echo_skb(netdev, context->echo_index);
365 }
366
367 /* Release context */
368 context->echo_index = MAX_TX_URBS;
369 atomic_dec(&priv->active_tx_jobs);
370
371 netif_wake_queue(netdev);
372 }
373
esd_usb2_read_bulk_callback(struct urb * urb)374 static void esd_usb2_read_bulk_callback(struct urb *urb)
375 {
376 struct esd_usb2 *dev = urb->context;
377 int retval;
378 int pos = 0;
379 int i;
380
381 switch (urb->status) {
382 case 0: /* success */
383 break;
384
385 case -ENOENT:
386 case -EPIPE:
387 case -EPROTO:
388 case -ESHUTDOWN:
389 return;
390
391 default:
392 dev_info(dev->udev->dev.parent,
393 "Rx URB aborted (%d)\n", urb->status);
394 goto resubmit_urb;
395 }
396
397 while (pos < urb->actual_length) {
398 struct esd_usb2_msg *msg;
399
400 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
401
402 switch (msg->msg.hdr.cmd) {
403 case CMD_CAN_RX:
404 if (msg->msg.rx.net >= dev->net_count) {
405 dev_err(dev->udev->dev.parent, "format error\n");
406 break;
407 }
408
409 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
410 break;
411
412 case CMD_CAN_TX:
413 if (msg->msg.txdone.net >= dev->net_count) {
414 dev_err(dev->udev->dev.parent, "format error\n");
415 break;
416 }
417
418 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
419 msg);
420 break;
421 }
422
423 pos += msg->msg.hdr.len << 2;
424
425 if (pos > urb->actual_length) {
426 dev_err(dev->udev->dev.parent, "format error\n");
427 break;
428 }
429 }
430
431 resubmit_urb:
432 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
433 urb->transfer_buffer, RX_BUFFER_SIZE,
434 esd_usb2_read_bulk_callback, dev);
435
436 retval = usb_submit_urb(urb, GFP_ATOMIC);
437 if (retval == -ENODEV) {
438 for (i = 0; i < dev->net_count; i++) {
439 if (dev->nets[i])
440 netif_device_detach(dev->nets[i]->netdev);
441 }
442 } else if (retval) {
443 dev_err(dev->udev->dev.parent,
444 "failed resubmitting read bulk urb: %d\n", retval);
445 }
446
447 return;
448 }
449
450 /*
451 * callback for bulk IN urb
452 */
esd_usb2_write_bulk_callback(struct urb * urb)453 static void esd_usb2_write_bulk_callback(struct urb *urb)
454 {
455 struct esd_tx_urb_context *context = urb->context;
456 struct esd_usb2_net_priv *priv;
457 struct net_device *netdev;
458 size_t size = sizeof(struct esd_usb2_msg);
459
460 WARN_ON(!context);
461
462 priv = context->priv;
463 netdev = priv->netdev;
464
465 /* free up our allocated buffer */
466 usb_free_coherent(urb->dev, size,
467 urb->transfer_buffer, urb->transfer_dma);
468
469 if (!netif_device_present(netdev))
470 return;
471
472 if (urb->status)
473 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
474
475 netif_trans_update(netdev);
476 }
477
show_firmware(struct device * d,struct device_attribute * attr,char * buf)478 static ssize_t show_firmware(struct device *d,
479 struct device_attribute *attr, char *buf)
480 {
481 struct usb_interface *intf = to_usb_interface(d);
482 struct esd_usb2 *dev = usb_get_intfdata(intf);
483
484 return sprintf(buf, "%d.%d.%d\n",
485 (dev->version >> 12) & 0xf,
486 (dev->version >> 8) & 0xf,
487 dev->version & 0xff);
488 }
489 static DEVICE_ATTR(firmware, 0444, show_firmware, NULL);
490
show_hardware(struct device * d,struct device_attribute * attr,char * buf)491 static ssize_t show_hardware(struct device *d,
492 struct device_attribute *attr, char *buf)
493 {
494 struct usb_interface *intf = to_usb_interface(d);
495 struct esd_usb2 *dev = usb_get_intfdata(intf);
496
497 return sprintf(buf, "%d.%d.%d\n",
498 (dev->version >> 28) & 0xf,
499 (dev->version >> 24) & 0xf,
500 (dev->version >> 16) & 0xff);
501 }
502 static DEVICE_ATTR(hardware, 0444, show_hardware, NULL);
503
show_nets(struct device * d,struct device_attribute * attr,char * buf)504 static ssize_t show_nets(struct device *d,
505 struct device_attribute *attr, char *buf)
506 {
507 struct usb_interface *intf = to_usb_interface(d);
508 struct esd_usb2 *dev = usb_get_intfdata(intf);
509
510 return sprintf(buf, "%d", dev->net_count);
511 }
512 static DEVICE_ATTR(nets, 0444, show_nets, NULL);
513
esd_usb2_send_msg(struct esd_usb2 * dev,struct esd_usb2_msg * msg)514 static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
515 {
516 int actual_length;
517
518 return usb_bulk_msg(dev->udev,
519 usb_sndbulkpipe(dev->udev, 2),
520 msg,
521 msg->msg.hdr.len << 2,
522 &actual_length,
523 1000);
524 }
525
esd_usb2_wait_msg(struct esd_usb2 * dev,struct esd_usb2_msg * msg)526 static int esd_usb2_wait_msg(struct esd_usb2 *dev,
527 struct esd_usb2_msg *msg)
528 {
529 int actual_length;
530
531 return usb_bulk_msg(dev->udev,
532 usb_rcvbulkpipe(dev->udev, 1),
533 msg,
534 sizeof(*msg),
535 &actual_length,
536 1000);
537 }
538
esd_usb2_setup_rx_urbs(struct esd_usb2 * dev)539 static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
540 {
541 int i, err = 0;
542
543 if (dev->rxinitdone)
544 return 0;
545
546 for (i = 0; i < MAX_RX_URBS; i++) {
547 struct urb *urb = NULL;
548 u8 *buf = NULL;
549 dma_addr_t buf_dma;
550
551 /* create a URB, and a buffer for it */
552 urb = usb_alloc_urb(0, GFP_KERNEL);
553 if (!urb) {
554 err = -ENOMEM;
555 break;
556 }
557
558 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
559 &buf_dma);
560 if (!buf) {
561 dev_warn(dev->udev->dev.parent,
562 "No memory left for USB buffer\n");
563 err = -ENOMEM;
564 goto freeurb;
565 }
566
567 urb->transfer_dma = buf_dma;
568
569 usb_fill_bulk_urb(urb, dev->udev,
570 usb_rcvbulkpipe(dev->udev, 1),
571 buf, RX_BUFFER_SIZE,
572 esd_usb2_read_bulk_callback, dev);
573 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
574 usb_anchor_urb(urb, &dev->rx_submitted);
575
576 err = usb_submit_urb(urb, GFP_KERNEL);
577 if (err) {
578 usb_unanchor_urb(urb);
579 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
580 urb->transfer_dma);
581 goto freeurb;
582 }
583
584 dev->rxbuf[i] = buf;
585 dev->rxbuf_dma[i] = buf_dma;
586
587 freeurb:
588 /* Drop reference, USB core will take care of freeing it */
589 usb_free_urb(urb);
590 if (err)
591 break;
592 }
593
594 /* Did we submit any URBs */
595 if (i == 0) {
596 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
597 return err;
598 }
599
600 /* Warn if we've couldn't transmit all the URBs */
601 if (i < MAX_RX_URBS) {
602 dev_warn(dev->udev->dev.parent,
603 "rx performance may be slow\n");
604 }
605
606 dev->rxinitdone = 1;
607 return 0;
608 }
609
610 /*
611 * Start interface
612 */
esd_usb2_start(struct esd_usb2_net_priv * priv)613 static int esd_usb2_start(struct esd_usb2_net_priv *priv)
614 {
615 struct esd_usb2 *dev = priv->usb2;
616 struct net_device *netdev = priv->netdev;
617 struct esd_usb2_msg *msg;
618 int err, i;
619
620 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
621 if (!msg) {
622 err = -ENOMEM;
623 goto out;
624 }
625
626 /*
627 * Enable all IDs
628 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
629 * Each bit represents one 11 bit CAN identifier. A set bit
630 * enables reception of the corresponding CAN identifier. A cleared
631 * bit disabled this identifier. An additional bitmask value
632 * following the CAN 2.0A bits is used to enable reception of
633 * extended CAN frames. Only the LSB of this final mask is checked
634 * for the complete 29 bit ID range. The IDADD message also allows
635 * filter configuration for an ID subset. In this case you can add
636 * the number of the starting bitmask (0..64) to the filter.option
637 * field followed by only some bitmasks.
638 */
639 msg->msg.hdr.cmd = CMD_IDADD;
640 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
641 msg->msg.filter.net = priv->index;
642 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
643 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
644 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
645 /* enable 29bit extended IDs */
646 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
647
648 err = esd_usb2_send_msg(dev, msg);
649 if (err)
650 goto out;
651
652 err = esd_usb2_setup_rx_urbs(dev);
653 if (err)
654 goto out;
655
656 priv->can.state = CAN_STATE_ERROR_ACTIVE;
657
658 out:
659 if (err == -ENODEV)
660 netif_device_detach(netdev);
661 if (err)
662 netdev_err(netdev, "couldn't start device: %d\n", err);
663
664 kfree(msg);
665 return err;
666 }
667
unlink_all_urbs(struct esd_usb2 * dev)668 static void unlink_all_urbs(struct esd_usb2 *dev)
669 {
670 struct esd_usb2_net_priv *priv;
671 int i, j;
672
673 usb_kill_anchored_urbs(&dev->rx_submitted);
674
675 for (i = 0; i < MAX_RX_URBS; ++i)
676 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
677 dev->rxbuf[i], dev->rxbuf_dma[i]);
678
679 for (i = 0; i < dev->net_count; i++) {
680 priv = dev->nets[i];
681 if (priv) {
682 usb_kill_anchored_urbs(&priv->tx_submitted);
683 atomic_set(&priv->active_tx_jobs, 0);
684
685 for (j = 0; j < MAX_TX_URBS; j++)
686 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
687 }
688 }
689 }
690
esd_usb2_open(struct net_device * netdev)691 static int esd_usb2_open(struct net_device *netdev)
692 {
693 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
694 int err;
695
696 /* common open */
697 err = open_candev(netdev);
698 if (err)
699 return err;
700
701 /* finally start device */
702 err = esd_usb2_start(priv);
703 if (err) {
704 netdev_warn(netdev, "couldn't start device: %d\n", err);
705 close_candev(netdev);
706 return err;
707 }
708
709 netif_start_queue(netdev);
710
711 return 0;
712 }
713
esd_usb2_start_xmit(struct sk_buff * skb,struct net_device * netdev)714 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
715 struct net_device *netdev)
716 {
717 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
718 struct esd_usb2 *dev = priv->usb2;
719 struct esd_tx_urb_context *context = NULL;
720 struct net_device_stats *stats = &netdev->stats;
721 struct can_frame *cf = (struct can_frame *)skb->data;
722 struct esd_usb2_msg *msg;
723 struct urb *urb;
724 u8 *buf;
725 int i, err;
726 int ret = NETDEV_TX_OK;
727 size_t size = sizeof(struct esd_usb2_msg);
728
729 if (can_dropped_invalid_skb(netdev, skb))
730 return NETDEV_TX_OK;
731
732 /* create a URB, and a buffer for it, and copy the data to the URB */
733 urb = usb_alloc_urb(0, GFP_ATOMIC);
734 if (!urb) {
735 stats->tx_dropped++;
736 dev_kfree_skb(skb);
737 goto nourbmem;
738 }
739
740 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
741 &urb->transfer_dma);
742 if (!buf) {
743 netdev_err(netdev, "No memory left for USB buffer\n");
744 stats->tx_dropped++;
745 dev_kfree_skb(skb);
746 goto nobufmem;
747 }
748
749 msg = (struct esd_usb2_msg *)buf;
750
751 msg->msg.hdr.len = 3; /* minimal length */
752 msg->msg.hdr.cmd = CMD_CAN_TX;
753 msg->msg.tx.net = priv->index;
754 msg->msg.tx.dlc = cf->can_dlc;
755 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
756
757 if (cf->can_id & CAN_RTR_FLAG)
758 msg->msg.tx.dlc |= ESD_RTR;
759
760 if (cf->can_id & CAN_EFF_FLAG)
761 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
762
763 for (i = 0; i < cf->can_dlc; i++)
764 msg->msg.tx.data[i] = cf->data[i];
765
766 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
767
768 for (i = 0; i < MAX_TX_URBS; i++) {
769 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
770 context = &priv->tx_contexts[i];
771 break;
772 }
773 }
774
775 /*
776 * This may never happen.
777 */
778 if (!context) {
779 netdev_warn(netdev, "couldn't find free context\n");
780 ret = NETDEV_TX_BUSY;
781 goto releasebuf;
782 }
783
784 context->priv = priv;
785 context->echo_index = i;
786 context->dlc = cf->can_dlc;
787
788 /* hnd must not be 0 - MSB is stripped in txdone handling */
789 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
790
791 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
792 msg->msg.hdr.len << 2,
793 esd_usb2_write_bulk_callback, context);
794
795 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
796
797 usb_anchor_urb(urb, &priv->tx_submitted);
798
799 can_put_echo_skb(skb, netdev, context->echo_index);
800
801 atomic_inc(&priv->active_tx_jobs);
802
803 /* Slow down tx path */
804 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
805 netif_stop_queue(netdev);
806
807 err = usb_submit_urb(urb, GFP_ATOMIC);
808 if (err) {
809 can_free_echo_skb(netdev, context->echo_index);
810
811 atomic_dec(&priv->active_tx_jobs);
812 usb_unanchor_urb(urb);
813
814 stats->tx_dropped++;
815
816 if (err == -ENODEV)
817 netif_device_detach(netdev);
818 else
819 netdev_warn(netdev, "failed tx_urb %d\n", err);
820
821 goto releasebuf;
822 }
823
824 netif_trans_update(netdev);
825
826 /*
827 * Release our reference to this URB, the USB core will eventually free
828 * it entirely.
829 */
830 usb_free_urb(urb);
831
832 return NETDEV_TX_OK;
833
834 releasebuf:
835 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
836
837 nobufmem:
838 usb_free_urb(urb);
839
840 nourbmem:
841 return ret;
842 }
843
esd_usb2_close(struct net_device * netdev)844 static int esd_usb2_close(struct net_device *netdev)
845 {
846 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
847 struct esd_usb2_msg *msg;
848 int i;
849
850 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
851 if (!msg)
852 return -ENOMEM;
853
854 /* Disable all IDs (see esd_usb2_start()) */
855 msg->msg.hdr.cmd = CMD_IDADD;
856 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
857 msg->msg.filter.net = priv->index;
858 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
859 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
860 msg->msg.filter.mask[i] = 0;
861 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
862 netdev_err(netdev, "sending idadd message failed\n");
863
864 /* set CAN controller to reset mode */
865 msg->msg.hdr.len = 2;
866 msg->msg.hdr.cmd = CMD_SETBAUD;
867 msg->msg.setbaud.net = priv->index;
868 msg->msg.setbaud.rsvd = 0;
869 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
870 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
871 netdev_err(netdev, "sending setbaud message failed\n");
872
873 priv->can.state = CAN_STATE_STOPPED;
874
875 netif_stop_queue(netdev);
876
877 close_candev(netdev);
878
879 kfree(msg);
880
881 return 0;
882 }
883
884 static const struct net_device_ops esd_usb2_netdev_ops = {
885 .ndo_open = esd_usb2_open,
886 .ndo_stop = esd_usb2_close,
887 .ndo_start_xmit = esd_usb2_start_xmit,
888 .ndo_change_mtu = can_change_mtu,
889 };
890
891 static const struct can_bittiming_const esd_usb2_bittiming_const = {
892 .name = "esd_usb2",
893 .tseg1_min = ESD_USB2_TSEG1_MIN,
894 .tseg1_max = ESD_USB2_TSEG1_MAX,
895 .tseg2_min = ESD_USB2_TSEG2_MIN,
896 .tseg2_max = ESD_USB2_TSEG2_MAX,
897 .sjw_max = ESD_USB2_SJW_MAX,
898 .brp_min = ESD_USB2_BRP_MIN,
899 .brp_max = ESD_USB2_BRP_MAX,
900 .brp_inc = ESD_USB2_BRP_INC,
901 };
902
esd_usb2_set_bittiming(struct net_device * netdev)903 static int esd_usb2_set_bittiming(struct net_device *netdev)
904 {
905 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
906 struct can_bittiming *bt = &priv->can.bittiming;
907 struct esd_usb2_msg *msg;
908 int err;
909 u32 canbtr;
910 int sjw_shift;
911
912 canbtr = ESD_USB2_UBR;
913 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
914 canbtr |= ESD_USB2_LOM;
915
916 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
917
918 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
919 USB_CANUSBM_PRODUCT_ID)
920 sjw_shift = ESD_USBM_SJW_SHIFT;
921 else
922 sjw_shift = ESD_USB2_SJW_SHIFT;
923
924 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
925 << sjw_shift;
926 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
927 & (ESD_USB2_TSEG1_MAX - 1))
928 << ESD_USB2_TSEG1_SHIFT;
929 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
930 << ESD_USB2_TSEG2_SHIFT;
931 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
932 canbtr |= ESD_USB2_3_SAMPLES;
933
934 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
935 if (!msg)
936 return -ENOMEM;
937
938 msg->msg.hdr.len = 2;
939 msg->msg.hdr.cmd = CMD_SETBAUD;
940 msg->msg.setbaud.net = priv->index;
941 msg->msg.setbaud.rsvd = 0;
942 msg->msg.setbaud.baud = cpu_to_le32(canbtr);
943
944 netdev_info(netdev, "setting BTR=%#x\n", canbtr);
945
946 err = esd_usb2_send_msg(priv->usb2, msg);
947
948 kfree(msg);
949 return err;
950 }
951
esd_usb2_get_berr_counter(const struct net_device * netdev,struct can_berr_counter * bec)952 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
953 struct can_berr_counter *bec)
954 {
955 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
956
957 bec->txerr = priv->bec.txerr;
958 bec->rxerr = priv->bec.rxerr;
959
960 return 0;
961 }
962
esd_usb2_set_mode(struct net_device * netdev,enum can_mode mode)963 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
964 {
965 switch (mode) {
966 case CAN_MODE_START:
967 netif_wake_queue(netdev);
968 break;
969
970 default:
971 return -EOPNOTSUPP;
972 }
973
974 return 0;
975 }
976
esd_usb2_probe_one_net(struct usb_interface * intf,int index)977 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
978 {
979 struct esd_usb2 *dev = usb_get_intfdata(intf);
980 struct net_device *netdev;
981 struct esd_usb2_net_priv *priv;
982 int err = 0;
983 int i;
984
985 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
986 if (!netdev) {
987 dev_err(&intf->dev, "couldn't alloc candev\n");
988 err = -ENOMEM;
989 goto done;
990 }
991
992 priv = netdev_priv(netdev);
993
994 init_usb_anchor(&priv->tx_submitted);
995 atomic_set(&priv->active_tx_jobs, 0);
996
997 for (i = 0; i < MAX_TX_URBS; i++)
998 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
999
1000 priv->usb2 = dev;
1001 priv->netdev = netdev;
1002 priv->index = index;
1003
1004 priv->can.state = CAN_STATE_STOPPED;
1005 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1006
1007 if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1008 USB_CANUSBM_PRODUCT_ID)
1009 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1010 else {
1011 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1012 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1013 }
1014
1015 priv->can.bittiming_const = &esd_usb2_bittiming_const;
1016 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1017 priv->can.do_set_mode = esd_usb2_set_mode;
1018 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1019
1020 netdev->flags |= IFF_ECHO; /* we support local echo */
1021
1022 netdev->netdev_ops = &esd_usb2_netdev_ops;
1023
1024 SET_NETDEV_DEV(netdev, &intf->dev);
1025 netdev->dev_id = index;
1026
1027 err = register_candev(netdev);
1028 if (err) {
1029 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1030 free_candev(netdev);
1031 err = -ENOMEM;
1032 goto done;
1033 }
1034
1035 dev->nets[index] = priv;
1036 netdev_info(netdev, "device %s registered\n", netdev->name);
1037
1038 done:
1039 return err;
1040 }
1041
1042 /*
1043 * probe function for new USB2 devices
1044 *
1045 * check version information and number of available
1046 * CAN interfaces
1047 */
esd_usb2_probe(struct usb_interface * intf,const struct usb_device_id * id)1048 static int esd_usb2_probe(struct usb_interface *intf,
1049 const struct usb_device_id *id)
1050 {
1051 struct esd_usb2 *dev;
1052 struct esd_usb2_msg *msg;
1053 int i, err;
1054
1055 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1056 if (!dev) {
1057 err = -ENOMEM;
1058 goto done;
1059 }
1060
1061 dev->udev = interface_to_usbdev(intf);
1062
1063 init_usb_anchor(&dev->rx_submitted);
1064
1065 usb_set_intfdata(intf, dev);
1066
1067 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1068 if (!msg) {
1069 err = -ENOMEM;
1070 goto free_msg;
1071 }
1072
1073 /* query number of CAN interfaces (nets) */
1074 msg->msg.hdr.cmd = CMD_VERSION;
1075 msg->msg.hdr.len = 2;
1076 msg->msg.version.rsvd = 0;
1077 msg->msg.version.flags = 0;
1078 msg->msg.version.drv_version = 0;
1079
1080 err = esd_usb2_send_msg(dev, msg);
1081 if (err < 0) {
1082 dev_err(&intf->dev, "sending version message failed\n");
1083 goto free_msg;
1084 }
1085
1086 err = esd_usb2_wait_msg(dev, msg);
1087 if (err < 0) {
1088 dev_err(&intf->dev, "no version message answer\n");
1089 goto free_msg;
1090 }
1091
1092 dev->net_count = (int)msg->msg.version_reply.nets;
1093 dev->version = le32_to_cpu(msg->msg.version_reply.version);
1094
1095 if (device_create_file(&intf->dev, &dev_attr_firmware))
1096 dev_err(&intf->dev,
1097 "Couldn't create device file for firmware\n");
1098
1099 if (device_create_file(&intf->dev, &dev_attr_hardware))
1100 dev_err(&intf->dev,
1101 "Couldn't create device file for hardware\n");
1102
1103 if (device_create_file(&intf->dev, &dev_attr_nets))
1104 dev_err(&intf->dev,
1105 "Couldn't create device file for nets\n");
1106
1107 /* do per device probing */
1108 for (i = 0; i < dev->net_count; i++)
1109 esd_usb2_probe_one_net(intf, i);
1110
1111 free_msg:
1112 kfree(msg);
1113 if (err)
1114 kfree(dev);
1115 done:
1116 return err;
1117 }
1118
1119 /*
1120 * called by the usb core when the device is removed from the system
1121 */
esd_usb2_disconnect(struct usb_interface * intf)1122 static void esd_usb2_disconnect(struct usb_interface *intf)
1123 {
1124 struct esd_usb2 *dev = usb_get_intfdata(intf);
1125 struct net_device *netdev;
1126 int i;
1127
1128 device_remove_file(&intf->dev, &dev_attr_firmware);
1129 device_remove_file(&intf->dev, &dev_attr_hardware);
1130 device_remove_file(&intf->dev, &dev_attr_nets);
1131
1132 usb_set_intfdata(intf, NULL);
1133
1134 if (dev) {
1135 for (i = 0; i < dev->net_count; i++) {
1136 if (dev->nets[i]) {
1137 netdev = dev->nets[i]->netdev;
1138 unregister_netdev(netdev);
1139 free_candev(netdev);
1140 }
1141 }
1142 unlink_all_urbs(dev);
1143 kfree(dev);
1144 }
1145 }
1146
1147 /* usb specific object needed to register this driver with the usb subsystem */
1148 static struct usb_driver esd_usb2_driver = {
1149 .name = "esd_usb2",
1150 .probe = esd_usb2_probe,
1151 .disconnect = esd_usb2_disconnect,
1152 .id_table = esd_usb2_table,
1153 };
1154
1155 module_usb_driver(esd_usb2_driver);
1156