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mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / drivers / net / can / usb / esd_usb2.c
blob91654d09275f4890cf3b08265bba25b0b65b0420
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/init.h>
20 #include <linux/signal.h>
21 #include <linux/slab.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/usb.h>
25
26 #include <linux/can.h>
27 #include <linux/can/dev.h>
28 #include <linux/can/error.h>
29
30 MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
31 MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
32 MODULE_LICENSE("GPL v2");
33
34 /* Define these values to match your devices */
35 #define USB_ESDGMBH_VENDOR_ID 0x0ab4
36 #define USB_CANUSB2_PRODUCT_ID 0x0010
37 #define USB_CANUSBM_PRODUCT_ID 0x0011
38
39 #define ESD_USB2_CAN_CLOCK 60000000
40 #define ESD_USBM_CAN_CLOCK 36000000
41 #define ESD_USB2_MAX_NETS 2
42
43 /* USB2 commands */
44 #define CMD_VERSION 1 /* also used for VERSION_REPLY */
45 #define CMD_CAN_RX 2 /* device to host only */
46 #define CMD_CAN_TX 3 /* also used for TX_DONE */
47 #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */
48 #define CMD_TS 5 /* also used for TS_REPLY */
49 #define CMD_IDADD 6 /* also used for IDADD_REPLY */
50
51 /* esd CAN message flags - dlc field */
52 #define ESD_RTR 0x10
53
54 /* esd CAN message flags - id field */
55 #define ESD_EXTID 0x20000000
56 #define ESD_EVENT 0x40000000
57 #define ESD_IDMASK 0x1fffffff
58
59 /* esd CAN event ids used by this driver */
60 #define ESD_EV_CAN_ERROR_EXT 2
61
62 /* baudrate message flags */
63 #define ESD_USB2_UBR 0x80000000
64 #define ESD_USB2_LOM 0x40000000
65 #define ESD_USB2_NO_BAUDRATE 0x7fffffff
66 #define ESD_USB2_TSEG1_MIN 1
67 #define ESD_USB2_TSEG1_MAX 16
68 #define ESD_USB2_TSEG1_SHIFT 16
69 #define ESD_USB2_TSEG2_MIN 1
70 #define ESD_USB2_TSEG2_MAX 8
71 #define ESD_USB2_TSEG2_SHIFT 20
72 #define ESD_USB2_SJW_MAX 4
73 #define ESD_USB2_SJW_SHIFT 14
74 #define ESD_USBM_SJW_SHIFT 24
75 #define ESD_USB2_BRP_MIN 1
76 #define ESD_USB2_BRP_MAX 1024
77 #define ESD_USB2_BRP_INC 1
78 #define ESD_USB2_3_SAMPLES 0x00800000
79
80 /* esd IDADD message */
81 #define ESD_ID_ENABLE 0x80
82 #define ESD_MAX_ID_SEGMENT 64
83
84 /* SJA1000 ECC register (emulated by usb2 firmware) */
85 #define SJA1000_ECC_SEG 0x1F
86 #define SJA1000_ECC_DIR 0x20
87 #define SJA1000_ECC_ERR 0x06
88 #define SJA1000_ECC_BIT 0x00
89 #define SJA1000_ECC_FORM 0x40
90 #define SJA1000_ECC_STUFF 0x80
91 #define SJA1000_ECC_MASK 0xc0
92
93 /* esd bus state event codes */
94 #define ESD_BUSSTATE_MASK 0xc0
95 #define ESD_BUSSTATE_WARN 0x40
96 #define ESD_BUSSTATE_ERRPASSIVE 0x80
97 #define ESD_BUSSTATE_BUSOFF 0xc0
98
99 #define RX_BUFFER_SIZE 1024
100 #define MAX_RX_URBS 4
101 #define MAX_TX_URBS 16 /* must be power of 2 */
102
103 struct header_msg {
104 u8 len; /* len is always the total message length in 32bit words */
105 u8 cmd;
106 u8 rsvd[2];
107 };
108
109 struct version_msg {
110 u8 len;
111 u8 cmd;
112 u8 rsvd;
113 u8 flags;
114 __le32 drv_version;
115 };
116
117 struct version_reply_msg {
118 u8 len;
119 u8 cmd;
120 u8 nets;
121 u8 features;
122 __le32 version;
123 u8 name[16];
124 __le32 rsvd;
125 __le32 ts;
126 };
127
128 struct rx_msg {
129 u8 len;
130 u8 cmd;
131 u8 net;
132 u8 dlc;
133 __le32 ts;
134 __le32 id; /* upper 3 bits contain flags */
135 u8 data[8];
136 };
137
138 struct tx_msg {
139 u8 len;
140 u8 cmd;
141 u8 net;
142 u8 dlc;
143 __le32 hnd;
144 __le32 id; /* upper 3 bits contain flags */
145 u8 data[8];
146 };
147
148 struct tx_done_msg {
149 u8 len;
150 u8 cmd;
151 u8 net;
152 u8 status;
153 __le32 hnd;
154 __le32 ts;
155 };
156
157 struct id_filter_msg {
158 u8 len;
159 u8 cmd;
160 u8 net;
161 u8 option;
162 __le32 mask[ESD_MAX_ID_SEGMENT + 1];
163 };
164
165 struct set_baudrate_msg {
166 u8 len;
167 u8 cmd;
168 u8 net;
169 u8 rsvd;
170 __le32 baud;
171 };
172
173 /* Main message type used between library and application */
174 struct __attribute__ ((packed)) esd_usb2_msg {
175 union {
176 struct header_msg hdr;
177 struct version_msg version;
178 struct version_reply_msg version_reply;
179 struct rx_msg rx;
180 struct tx_msg tx;
181 struct tx_done_msg txdone;
182 struct set_baudrate_msg setbaud;
183 struct id_filter_msg filter;
184 } msg;
185 };
186
187 static struct usb_device_id esd_usb2_table[] = {
188 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
189 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)},
190 {}
191 };
192 MODULE_DEVICE_TABLE(usb, esd_usb2_table);
193
194 struct esd_usb2_net_priv;
195
196 struct esd_tx_urb_context {
197 struct esd_usb2_net_priv *priv;
198 u32 echo_index;
199 int dlc;
200 };
201
202 struct esd_usb2 {
203 struct usb_device *udev;
204 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
205
206 struct usb_anchor rx_submitted;
207
208 int net_count;
209 u32 version;
210 int rxinitdone;
211 };
212
213 struct esd_usb2_net_priv {
214 struct can_priv can; /* must be the first member */
215
216 atomic_t active_tx_jobs;
217 struct usb_anchor tx_submitted;
218 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
219
220 struct esd_usb2 *usb2;
221 struct net_device *netdev;
222 int index;
223 u8 old_state;
224 struct can_berr_counter bec;
225 };
226
227 static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
228 struct esd_usb2_msg *msg)
229 {
230 struct net_device_stats *stats = &priv->netdev->stats;
231 struct can_frame *cf;
232 struct sk_buff *skb;
233 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
234
235 if (id == ESD_EV_CAN_ERROR_EXT) {
236 u8 state = msg->msg.rx.data[0];
237 u8 ecc = msg->msg.rx.data[1];
238 u8 txerr = msg->msg.rx.data[2];
239 u8 rxerr = msg->msg.rx.data[3];
240
241 skb = alloc_can_err_skb(priv->netdev, &cf);
242 if (skb == NULL) {
243 stats->rx_dropped++;
244 return;
245 }
246
247 if (state != priv->old_state) {
248 priv->old_state = state;
249
250 switch (state & ESD_BUSSTATE_MASK) {
251 case ESD_BUSSTATE_BUSOFF:
252 priv->can.state = CAN_STATE_BUS_OFF;
253 cf->can_id |= CAN_ERR_BUSOFF;
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[2] |= CAN_ERR_PROT_UNSPEC;
286 cf->data[3] = ecc & SJA1000_ECC_SEG;
287 break;
288 }
289
290 /* Error occurred during transmission? */
291 if (!(ecc & SJA1000_ECC_DIR))
292 cf->data[2] |= CAN_ERR_PROT_TX;
293
294 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
295 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
296 cf->data[1] = (txerr > rxerr) ?
297 CAN_ERR_CRTL_TX_PASSIVE :
298 CAN_ERR_CRTL_RX_PASSIVE;
299 }
300 cf->data[6] = txerr;
301 cf->data[7] = rxerr;
302 }
303
304 netif_rx(skb);
305
306 priv->bec.txerr = txerr;
307 priv->bec.rxerr = rxerr;
308
309 stats->rx_packets++;
310 stats->rx_bytes += cf->can_dlc;
311 }
312 }
313
314 static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
315 struct esd_usb2_msg *msg)
316 {
317 struct net_device_stats *stats = &priv->netdev->stats;
318 struct can_frame *cf;
319 struct sk_buff *skb;
320 int i;
321 u32 id;
322
323 if (!netif_device_present(priv->netdev))
324 return;
325
326 id = le32_to_cpu(msg->msg.rx.id);
327
328 if (id & ESD_EVENT) {
329 esd_usb2_rx_event(priv, msg);
330 } else {
331 skb = alloc_can_skb(priv->netdev, &cf);
332 if (skb == NULL) {
333 stats->rx_dropped++;
334 return;
335 }
336
337 cf->can_id = id & ESD_IDMASK;
338 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
339
340 if (id & ESD_EXTID)
341 cf->can_id |= CAN_EFF_FLAG;
342
343 if (msg->msg.rx.dlc & ESD_RTR) {
344 cf->can_id |= CAN_RTR_FLAG;
345 } else {
346 for (i = 0; i < cf->can_dlc; i++)
347 cf->data[i] = msg->msg.rx.data[i];
348 }
349
350 netif_rx(skb);
351
352 stats->rx_packets++;
353 stats->rx_bytes += cf->can_dlc;
354 }
355
356 return;
357 }
358
359 static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
360 struct esd_usb2_msg *msg)
361 {
362 struct net_device_stats *stats = &priv->netdev->stats;
363 struct net_device *netdev = priv->netdev;
364 struct esd_tx_urb_context *context;
365
366 if (!netif_device_present(netdev))
367 return;
368
369 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
370
371 if (!msg->msg.txdone.status) {
372 stats->tx_packets++;
373 stats->tx_bytes += context->dlc;
374 can_get_echo_skb(netdev, context->echo_index);
375 } else {
376 stats->tx_errors++;
377 can_free_echo_skb(netdev, context->echo_index);
378 }
379
380 /* Release context */
381 context->echo_index = MAX_TX_URBS;
382 atomic_dec(&priv->active_tx_jobs);
383
384 netif_wake_queue(netdev);
385 }
386
387 static void esd_usb2_read_bulk_callback(struct urb *urb)
388 {
389 struct esd_usb2 *dev = urb->context;
390 int retval;
391 int pos = 0;
392 int i;
393
394 switch (urb->status) {
395 case 0: /* success */
396 break;
397
398 case -ENOENT:
399 case -ESHUTDOWN:
400 return;
401
402 default:
403 dev_info(dev->udev->dev.parent,
404 "Rx URB aborted (%d)\n", urb->status);
405 goto resubmit_urb;
406 }
407
408 while (pos < urb->actual_length) {
409 struct esd_usb2_msg *msg;
410
411 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
412
413 switch (msg->msg.hdr.cmd) {
414 case CMD_CAN_RX:
415 if (msg->msg.rx.net >= dev->net_count) {
416 dev_err(dev->udev->dev.parent, "format error\n");
417 break;
418 }
419
420 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
421 break;
422
423 case CMD_CAN_TX:
424 if (msg->msg.txdone.net >= dev->net_count) {
425 dev_err(dev->udev->dev.parent, "format error\n");
426 break;
427 }
428
429 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
430 msg);
431 break;
432 }
433
434 pos += msg->msg.hdr.len << 2;
435
436 if (pos > urb->actual_length) {
437 dev_err(dev->udev->dev.parent, "format error\n");
438 break;
439 }
440 }
441
442 resubmit_urb:
443 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
444 urb->transfer_buffer, RX_BUFFER_SIZE,
445 esd_usb2_read_bulk_callback, dev);
446
447 retval = usb_submit_urb(urb, GFP_ATOMIC);
448 if (retval == -ENODEV) {
449 for (i = 0; i < dev->net_count; i++) {
450 if (dev->nets[i])
451 netif_device_detach(dev->nets[i]->netdev);
452 }
453 } else if (retval) {
454 dev_err(dev->udev->dev.parent,
455 "failed resubmitting read bulk urb: %d\n", retval);
456 }
457
458 return;
459 }
460
461 /*
462 * callback for bulk IN urb
463 */
464 static void esd_usb2_write_bulk_callback(struct urb *urb)
465 {
466 struct esd_tx_urb_context *context = urb->context;
467 struct esd_usb2_net_priv *priv;
468 struct esd_usb2 *dev;
469 struct net_device *netdev;
470 size_t size = sizeof(struct esd_usb2_msg);
471
472 WARN_ON(!context);
473
474 priv = context->priv;
475 netdev = priv->netdev;
476 dev = priv->usb2;
477
478 /* free up our allocated buffer */
479 usb_free_coherent(urb->dev, size,
480 urb->transfer_buffer, urb->transfer_dma);
481
482 if (!netif_device_present(netdev))
483 return;
484
485 if (urb->status)
486 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
487
488 netdev->trans_start = jiffies;
489 }
490
491 static ssize_t show_firmware(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 >> 12) & 0xf,
499 (dev->version >> 8) & 0xf,
500 dev->version & 0xff);
501 }
502 static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
503
504 static ssize_t show_hardware(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.%d.%d\n",
511 (dev->version >> 28) & 0xf,
512 (dev->version >> 24) & 0xf,
513 (dev->version >> 16) & 0xff);
514 }
515 static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
516
517 static ssize_t show_nets(struct device *d,
518 struct device_attribute *attr, char *buf)
519 {
520 struct usb_interface *intf = to_usb_interface(d);
521 struct esd_usb2 *dev = usb_get_intfdata(intf);
522
523 return sprintf(buf, "%d", dev->net_count);
524 }
525 static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
526
527 static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
528 {
529 int actual_length;
530
531 return usb_bulk_msg(dev->udev,
532 usb_sndbulkpipe(dev->udev, 2),
533 msg,
534 msg->msg.hdr.len << 2,
535 &actual_length,
536 1000);
537 }
538
539 static int esd_usb2_wait_msg(struct esd_usb2 *dev,
540 struct esd_usb2_msg *msg)
541 {
542 int actual_length;
543
544 return usb_bulk_msg(dev->udev,
545 usb_rcvbulkpipe(dev->udev, 1),
546 msg,
547 sizeof(*msg),
548 &actual_length,
549 1000);
550 }
551
552 static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
553 {
554 int i, err = 0;
555
556 if (dev->rxinitdone)
557 return 0;
558
559 for (i = 0; i < MAX_RX_URBS; i++) {
560 struct urb *urb = NULL;
561 u8 *buf = NULL;
562
563 /* create a URB, and a buffer for it */
564 urb = usb_alloc_urb(0, GFP_KERNEL);
565 if (!urb) {
566 dev_warn(dev->udev->dev.parent,
567 "No memory left for URBs\n");
568 err = -ENOMEM;
569 break;
570 }
571
572 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
573 &urb->transfer_dma);
574 if (!buf) {
575 dev_warn(dev->udev->dev.parent,
576 "No memory left for USB buffer\n");
577 err = -ENOMEM;
578 goto freeurb;
579 }
580
581 usb_fill_bulk_urb(urb, dev->udev,
582 usb_rcvbulkpipe(dev->udev, 1),
583 buf, RX_BUFFER_SIZE,
584 esd_usb2_read_bulk_callback, dev);
585 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
586 usb_anchor_urb(urb, &dev->rx_submitted);
587
588 err = usb_submit_urb(urb, GFP_KERNEL);
589 if (err) {
590 usb_unanchor_urb(urb);
591 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
592 urb->transfer_dma);
593 }
594
595 freeurb:
596 /* Drop reference, USB core will take care of freeing it */
597 usb_free_urb(urb);
598 if (err)
599 break;
600 }
601
602 /* Did we submit any URBs */
603 if (i == 0) {
604 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
605 return err;
606 }
607
608 /* Warn if we've couldn't transmit all the URBs */
609 if (i < MAX_RX_URBS) {
610 dev_warn(dev->udev->dev.parent,
611 "rx performance may be slow\n");
612 }
613
614 dev->rxinitdone = 1;
615 return 0;
616 }
617
618 /*
619 * Start interface
620 */
621 static int esd_usb2_start(struct esd_usb2_net_priv *priv)
622 {
623 struct esd_usb2 *dev = priv->usb2;
624 struct net_device *netdev = priv->netdev;
625 struct esd_usb2_msg *msg;
626 int err, i;
627
628 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
629 if (!msg) {
630 err = -ENOMEM;
631 goto out;
632 }
633
634 /*
635 * Enable all IDs
636 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
637 * Each bit represents one 11 bit CAN identifier. A set bit
638 * enables reception of the corresponding CAN identifier. A cleared
639 * bit disabled this identifier. An additional bitmask value
640 * following the CAN 2.0A bits is used to enable reception of
641 * extended CAN frames. Only the LSB of this final mask is checked
642 * for the complete 29 bit ID range. The IDADD message also allows
643 * filter configuration for an ID subset. In this case you can add
644 * the number of the starting bitmask (0..64) to the filter.option
645 * field followed by only some bitmasks.
646 */
647 msg->msg.hdr.cmd = CMD_IDADD;
648 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
649 msg->msg.filter.net = priv->index;
650 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
651 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
652 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
653 /* enable 29bit extended IDs */
654 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
655
656 err = esd_usb2_send_msg(dev, msg);
657 if (err)
658 goto out;
659
660 err = esd_usb2_setup_rx_urbs(dev);
661 if (err)
662 goto out;
663
664 priv->can.state = CAN_STATE_ERROR_ACTIVE;
665
666 out:
667 if (err == -ENODEV)
668 netif_device_detach(netdev);
669 if (err)
670 netdev_err(netdev, "couldn't start device: %d\n", err);
671
672 kfree(msg);
673 return err;
674 }
675
676 static void unlink_all_urbs(struct esd_usb2 *dev)
677 {
678 struct esd_usb2_net_priv *priv;
679 int i, j;
680
681 usb_kill_anchored_urbs(&dev->rx_submitted);
682 for (i = 0; i < dev->net_count; i++) {
683 priv = dev->nets[i];
684 if (priv) {
685 usb_kill_anchored_urbs(&priv->tx_submitted);
686 atomic_set(&priv->active_tx_jobs, 0);
687
688 for (j = 0; j < MAX_TX_URBS; j++)
689 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
690 }
691 }
692 }
693
694 static int esd_usb2_open(struct net_device *netdev)
695 {
696 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
697 int err;
698
699 /* common open */
700 err = open_candev(netdev);
701 if (err)
702 return err;
703
704 /* finally start device */
705 err = esd_usb2_start(priv);
706 if (err) {
707 netdev_warn(netdev, "couldn't start device: %d\n", err);
708 close_candev(netdev);
709 return err;
710 }
711
712 netif_start_queue(netdev);
713
714 return 0;
715 }
716
717 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
718 struct net_device *netdev)
719 {
720 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
721 struct esd_usb2 *dev = priv->usb2;
722 struct esd_tx_urb_context *context = NULL;
723 struct net_device_stats *stats = &netdev->stats;
724 struct can_frame *cf = (struct can_frame *)skb->data;
725 struct esd_usb2_msg *msg;
726 struct urb *urb;
727 u8 *buf;
728 int i, err;
729 int ret = NETDEV_TX_OK;
730 size_t size = sizeof(struct esd_usb2_msg);
731
732 if (can_dropped_invalid_skb(netdev, skb))
733 return NETDEV_TX_OK;
734
735 /* create a URB, and a buffer for it, and copy the data to the URB */
736 urb = usb_alloc_urb(0, GFP_ATOMIC);
737 if (!urb) {
738 netdev_err(netdev, "No memory left for URBs\n");
739 stats->tx_dropped++;
740 dev_kfree_skb(skb);
741 goto nourbmem;
742 }
743
744 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
745 &urb->transfer_dma);
746 if (!buf) {
747 netdev_err(netdev, "No memory left for USB buffer\n");
748 stats->tx_dropped++;
749 dev_kfree_skb(skb);
750 goto nobufmem;
751 }
752
753 msg = (struct esd_usb2_msg *)buf;
754
755 msg->msg.hdr.len = 3; /* minimal length */
756 msg->msg.hdr.cmd = CMD_CAN_TX;
757 msg->msg.tx.net = priv->index;
758 msg->msg.tx.dlc = cf->can_dlc;
759 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
760
761 if (cf->can_id & CAN_RTR_FLAG)
762 msg->msg.tx.dlc |= ESD_RTR;
763
764 if (cf->can_id & CAN_EFF_FLAG)
765 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
766
767 for (i = 0; i < cf->can_dlc; i++)
768 msg->msg.tx.data[i] = cf->data[i];
769
770 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
771
772 for (i = 0; i < MAX_TX_URBS; i++) {
773 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
774 context = &priv->tx_contexts[i];
775 break;
776 }
777 }
778
779 /*
780 * This may never happen.
781 */
782 if (!context) {
783 netdev_warn(netdev, "couldn't find free context\n");
784 ret = NETDEV_TX_BUSY;
785 goto releasebuf;
786 }
787
788 context->priv = priv;
789 context->echo_index = i;
790 context->dlc = cf->can_dlc;
791
792 /* hnd must not be 0 - MSB is stripped in txdone handling */
793 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
794
795 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
796 msg->msg.hdr.len << 2,
797 esd_usb2_write_bulk_callback, context);
798
799 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
800
801 usb_anchor_urb(urb, &priv->tx_submitted);
802
803 can_put_echo_skb(skb, netdev, context->echo_index);
804
805 atomic_inc(&priv->active_tx_jobs);
806
807 /* Slow down tx path */
808 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
809 netif_stop_queue(netdev);
810
811 err = usb_submit_urb(urb, GFP_ATOMIC);
812 if (err) {
813 can_free_echo_skb(netdev, context->echo_index);
814
815 atomic_dec(&priv->active_tx_jobs);
816 usb_unanchor_urb(urb);
817
818 stats->tx_dropped++;
819
820 if (err == -ENODEV)
821 netif_device_detach(netdev);
822 else
823 netdev_warn(netdev, "failed tx_urb %d\n", err);
824
825 goto releasebuf;
826 }
827
828 netdev->trans_start = jiffies;
829
830 /*
831 * Release our reference to this URB, the USB core will eventually free
832 * it entirely.
833 */
834 usb_free_urb(urb);
835
836 return NETDEV_TX_OK;
837
838 releasebuf:
839 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
840
841 nobufmem:
842 usb_free_urb(urb);
843
844 nourbmem:
845 return ret;
846 }
847
848 static int esd_usb2_close(struct net_device *netdev)
849 {
850 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
851 struct esd_usb2_msg *msg;
852 int i;
853
854 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
855 if (!msg)
856 return -ENOMEM;
857
858 /* Disable all IDs (see esd_usb2_start()) */
859 msg->msg.hdr.cmd = CMD_IDADD;
860 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
861 msg->msg.filter.net = priv->index;
862 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
863 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
864 msg->msg.filter.mask[i] = 0;
865 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
866 netdev_err(netdev, "sending idadd message failed\n");
867
868 /* set CAN controller to reset mode */
869 msg->msg.hdr.len = 2;
870 msg->msg.hdr.cmd = CMD_SETBAUD;
871 msg->msg.setbaud.net = priv->index;
872 msg->msg.setbaud.rsvd = 0;
873 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
874 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
875 netdev_err(netdev, "sending setbaud message failed\n");
876
877 priv->can.state = CAN_STATE_STOPPED;
878
879 netif_stop_queue(netdev);
880
881 close_candev(netdev);
882
883 kfree(msg);
884
885 return 0;
886 }
887
888 static const struct net_device_ops esd_usb2_netdev_ops = {
889 .ndo_open = esd_usb2_open,
890 .ndo_stop = esd_usb2_close,
891 .ndo_start_xmit = esd_usb2_start_xmit,
892 };
893
894 static const struct can_bittiming_const esd_usb2_bittiming_const = {
895 .name = "esd_usb2",
896 .tseg1_min = ESD_USB2_TSEG1_MIN,
897 .tseg1_max = ESD_USB2_TSEG1_MAX,
898 .tseg2_min = ESD_USB2_TSEG2_MIN,
899 .tseg2_max = ESD_USB2_TSEG2_MAX,
900 .sjw_max = ESD_USB2_SJW_MAX,
901 .brp_min = ESD_USB2_BRP_MIN,
902 .brp_max = ESD_USB2_BRP_MAX,
903 .brp_inc = ESD_USB2_BRP_INC,
904 };
905
906 static int esd_usb2_set_bittiming(struct net_device *netdev)
907 {
908 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
909 struct can_bittiming *bt = &priv->can.bittiming;
910 struct esd_usb2_msg *msg;
911 int err;
912 u32 canbtr;
913 int sjw_shift;
914
915 canbtr = ESD_USB2_UBR;
916 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
917 canbtr |= ESD_USB2_LOM;
918
919 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
920
921 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
922 USB_CANUSBM_PRODUCT_ID)
923 sjw_shift = ESD_USBM_SJW_SHIFT;
924 else
925 sjw_shift = ESD_USB2_SJW_SHIFT;
926
927 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
928 << sjw_shift;
929 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
930 & (ESD_USB2_TSEG1_MAX - 1))
931 << ESD_USB2_TSEG1_SHIFT;
932 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
933 << ESD_USB2_TSEG2_SHIFT;
934 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
935 canbtr |= ESD_USB2_3_SAMPLES;
936
937 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
938 if (!msg)
939 return -ENOMEM;
940
941 msg->msg.hdr.len = 2;
942 msg->msg.hdr.cmd = CMD_SETBAUD;
943 msg->msg.setbaud.net = priv->index;
944 msg->msg.setbaud.rsvd = 0;
945 msg->msg.setbaud.baud = cpu_to_le32(canbtr);
946
947 netdev_info(netdev, "setting BTR=%#x\n", canbtr);
948
949 err = esd_usb2_send_msg(priv->usb2, msg);
950
951 kfree(msg);
952 return err;
953 }
954
955 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
956 struct can_berr_counter *bec)
957 {
958 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
959
960 bec->txerr = priv->bec.txerr;
961 bec->rxerr = priv->bec.rxerr;
962
963 return 0;
964 }
965
966 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
967 {
968 switch (mode) {
969 case CAN_MODE_START:
970 netif_wake_queue(netdev);
971 break;
972
973 default:
974 return -EOPNOTSUPP;
975 }
976
977 return 0;
978 }
979
980 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
981 {
982 struct esd_usb2 *dev = usb_get_intfdata(intf);
983 struct net_device *netdev;
984 struct esd_usb2_net_priv *priv;
985 int err = 0;
986 int i;
987
988 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
989 if (!netdev) {
990 dev_err(&intf->dev, "couldn't alloc candev\n");
991 err = -ENOMEM;
992 goto done;
993 }
994
995 priv = netdev_priv(netdev);
996
997 init_usb_anchor(&priv->tx_submitted);
998 atomic_set(&priv->active_tx_jobs, 0);
999
1000 for (i = 0; i < MAX_TX_URBS; i++)
1001 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1002
1003 priv->usb2 = dev;
1004 priv->netdev = netdev;
1005 priv->index = index;
1006
1007 priv->can.state = CAN_STATE_STOPPED;
1008 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1009
1010 if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1011 USB_CANUSBM_PRODUCT_ID)
1012 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1013 else {
1014 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1015 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1016 }
1017
1018 priv->can.bittiming_const = &esd_usb2_bittiming_const;
1019 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1020 priv->can.do_set_mode = esd_usb2_set_mode;
1021 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1022
1023 netdev->flags |= IFF_ECHO; /* we support local echo */
1024
1025 netdev->netdev_ops = &esd_usb2_netdev_ops;
1026
1027 SET_NETDEV_DEV(netdev, &intf->dev);
1028
1029 err = register_candev(netdev);
1030 if (err) {
1031 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1032 free_candev(netdev);
1033 err = -ENOMEM;
1034 goto done;
1035 }
1036
1037 dev->nets[index] = priv;
1038 netdev_info(netdev, "device %s registered\n", netdev->name);
1039
1040 done:
1041 return err;
1042 }
1043
1044 /*
1045 * probe function for new USB2 devices
1046 *
1047 * check version information and number of available
1048 * CAN interfaces
1049 */
1050 static int esd_usb2_probe(struct usb_interface *intf,
1051 const struct usb_device_id *id)
1052 {
1053 struct esd_usb2 *dev;
1054 struct esd_usb2_msg *msg;
1055 int i, err;
1056
1057 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1058 if (!dev) {
1059 err = -ENOMEM;
1060 goto done;
1061 }
1062
1063 dev->udev = interface_to_usbdev(intf);
1064
1065 init_usb_anchor(&dev->rx_submitted);
1066
1067 usb_set_intfdata(intf, dev);
1068
1069 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1070 if (!msg) {
1071 err = -ENOMEM;
1072 goto free_msg;
1073 }
1074
1075 /* query number of CAN interfaces (nets) */
1076 msg->msg.hdr.cmd = CMD_VERSION;
1077 msg->msg.hdr.len = 2;
1078 msg->msg.version.rsvd = 0;
1079 msg->msg.version.flags = 0;
1080 msg->msg.version.drv_version = 0;
1081
1082 err = esd_usb2_send_msg(dev, msg);
1083 if (err < 0) {
1084 dev_err(&intf->dev, "sending version message failed\n");
1085 goto free_msg;
1086 }
1087
1088 err = esd_usb2_wait_msg(dev, msg);
1089 if (err < 0) {
1090 dev_err(&intf->dev, "no version message answer\n");
1091 goto free_msg;
1092 }
1093
1094 dev->net_count = (int)msg->msg.version_reply.nets;
1095 dev->version = le32_to_cpu(msg->msg.version_reply.version);
1096
1097 if (device_create_file(&intf->dev, &dev_attr_firmware))
1098 dev_err(&intf->dev,
1099 "Couldn't create device file for firmware\n");
1100
1101 if (device_create_file(&intf->dev, &dev_attr_hardware))
1102 dev_err(&intf->dev,
1103 "Couldn't create device file for hardware\n");
1104
1105 if (device_create_file(&intf->dev, &dev_attr_nets))
1106 dev_err(&intf->dev,
1107 "Couldn't create device file for nets\n");
1108
1109 /* do per device probing */
1110 for (i = 0; i < dev->net_count; i++)
1111 esd_usb2_probe_one_net(intf, i);
1112
1113 free_msg:
1114 kfree(msg);
1115 if (err)
1116 kfree(dev);
1117 done:
1118 return err;
1119 }
1120
1121 /*
1122 * called by the usb core when the device is removed from the system
1123 */
1124 static void esd_usb2_disconnect(struct usb_interface *intf)
1125 {
1126 struct esd_usb2 *dev = usb_get_intfdata(intf);
1127 struct net_device *netdev;
1128 int i;
1129
1130 device_remove_file(&intf->dev, &dev_attr_firmware);
1131 device_remove_file(&intf->dev, &dev_attr_hardware);
1132 device_remove_file(&intf->dev, &dev_attr_nets);
1133
1134 usb_set_intfdata(intf, NULL);
1135
1136 if (dev) {
1137 for (i = 0; i < dev->net_count; i++) {
1138 if (dev->nets[i]) {
1139 netdev = dev->nets[i]->netdev;
1140 unregister_netdev(netdev);
1141 free_candev(netdev);
1142 }
1143 }
1144 unlink_all_urbs(dev);
1145 kfree(dev);
1146 }
1147 }
1148
1149 /* usb specific object needed to register this driver with the usb subsystem */
1150 static struct usb_driver esd_usb2_driver = {
1151 .name = "esd_usb2",
1152 .probe = esd_usb2_probe,
1153 .disconnect = esd_usb2_disconnect,
1154 .id_table = esd_usb2_table,
1155 };
1156
1157 module_usb_driver(esd_usb2_driver);
Linux with added FPC-III support