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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / net / can / usb / usb_8dev.c
bloba731720f1d132501d12d6241ccee833ae2e61787
1 /*
2 * CAN driver for "8 devices" USB2CAN converter
3 *
4 * Copyright (C) 2012 Bernd Krumboeck (krumboeck@universalnet.at)
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.
17 *
18 * This driver is inspired by the 3.2.0 version of drivers/net/can/usb/ems_usb.c
19 * and drivers/net/can/usb/esd_usb2.c
20 *
21 * Many thanks to Gerhard Bertelsmann (info@gerhard-bertelsmann.de)
22 * for testing and fixing this driver. Also many thanks to "8 devices",
23 * who were very cooperative and answered my questions.
24 */
25
26 #include <linux/signal.h>
27 #include <linux/slab.h>
28 #include <linux/module.h>
29 #include <linux/netdevice.h>
30 #include <linux/usb.h>
31
32 #include <linux/can.h>
33 #include <linux/can/dev.h>
34 #include <linux/can/error.h>
35 #include <linux/can/led.h>
36
37 /* driver constants */
38 #define MAX_RX_URBS 20
39 #define MAX_TX_URBS 20
40 #define RX_BUFFER_SIZE 64
41
42 /* vendor and product id */
43 #define USB_8DEV_VENDOR_ID 0x0483
44 #define USB_8DEV_PRODUCT_ID 0x1234
45
46 /* endpoints */
47 enum usb_8dev_endpoint {
48 USB_8DEV_ENDP_DATA_RX = 1,
49 USB_8DEV_ENDP_DATA_TX,
50 USB_8DEV_ENDP_CMD_RX,
51 USB_8DEV_ENDP_CMD_TX
52 };
53
54 /* device CAN clock */
55 #define USB_8DEV_ABP_CLOCK 32000000
56
57 /* setup flags */
58 #define USB_8DEV_SILENT 0x01
59 #define USB_8DEV_LOOPBACK 0x02
60 #define USB_8DEV_DISABLE_AUTO_RESTRANS 0x04
61 #define USB_8DEV_STATUS_FRAME 0x08
62
63 /* commands */
64 enum usb_8dev_cmd {
65 USB_8DEV_RESET = 1,
66 USB_8DEV_OPEN,
67 USB_8DEV_CLOSE,
68 USB_8DEV_SET_SPEED,
69 USB_8DEV_SET_MASK_FILTER,
70 USB_8DEV_GET_STATUS,
71 USB_8DEV_GET_STATISTICS,
72 USB_8DEV_GET_SERIAL,
73 USB_8DEV_GET_SOFTW_VER,
74 USB_8DEV_GET_HARDW_VER,
75 USB_8DEV_RESET_TIMESTAMP,
76 USB_8DEV_GET_SOFTW_HARDW_VER
77 };
78
79 /* command options */
80 #define USB_8DEV_BAUD_MANUAL 0x09
81 #define USB_8DEV_CMD_START 0x11
82 #define USB_8DEV_CMD_END 0x22
83
84 #define USB_8DEV_CMD_SUCCESS 0
85 #define USB_8DEV_CMD_ERROR 255
86
87 #define USB_8DEV_CMD_TIMEOUT 1000
88
89 /* frames */
90 #define USB_8DEV_DATA_START 0x55
91 #define USB_8DEV_DATA_END 0xAA
92
93 #define USB_8DEV_TYPE_CAN_FRAME 0
94 #define USB_8DEV_TYPE_ERROR_FRAME 3
95
96 #define USB_8DEV_EXTID 0x01
97 #define USB_8DEV_RTR 0x02
98 #define USB_8DEV_ERR_FLAG 0x04
99
100 /* status */
101 #define USB_8DEV_STATUSMSG_OK 0x00 /* Normal condition. */
102 #define USB_8DEV_STATUSMSG_OVERRUN 0x01 /* Overrun occured when sending */
103 #define USB_8DEV_STATUSMSG_BUSLIGHT 0x02 /* Error counter has reached 96 */
104 #define USB_8DEV_STATUSMSG_BUSHEAVY 0x03 /* Error count. has reached 128 */
105 #define USB_8DEV_STATUSMSG_BUSOFF 0x04 /* Device is in BUSOFF */
106 #define USB_8DEV_STATUSMSG_STUFF 0x20 /* Stuff Error */
107 #define USB_8DEV_STATUSMSG_FORM 0x21 /* Form Error */
108 #define USB_8DEV_STATUSMSG_ACK 0x23 /* Ack Error */
109 #define USB_8DEV_STATUSMSG_BIT0 0x24 /* Bit1 Error */
110 #define USB_8DEV_STATUSMSG_BIT1 0x25 /* Bit0 Error */
111 #define USB_8DEV_STATUSMSG_CRC 0x27 /* CRC Error */
112
113 #define USB_8DEV_RP_MASK 0x7F /* Mask for Receive Error Bit */
114
115
116 /* table of devices that work with this driver */
117 static const struct usb_device_id usb_8dev_table[] = {
118 { USB_DEVICE(USB_8DEV_VENDOR_ID, USB_8DEV_PRODUCT_ID) },
119 { } /* Terminating entry */
120 };
121
122 MODULE_DEVICE_TABLE(usb, usb_8dev_table);
123
124 struct usb_8dev_tx_urb_context {
125 struct usb_8dev_priv *priv;
126
127 u32 echo_index;
128 u8 dlc;
129 };
130
131 /* Structure to hold all of our device specific stuff */
132 struct usb_8dev_priv {
133 struct can_priv can; /* must be the first member */
134
135 struct sk_buff *echo_skb[MAX_TX_URBS];
136
137 struct usb_device *udev;
138 struct net_device *netdev;
139
140 atomic_t active_tx_urbs;
141 struct usb_anchor tx_submitted;
142 struct usb_8dev_tx_urb_context tx_contexts[MAX_TX_URBS];
143
144 struct usb_anchor rx_submitted;
145
146 struct can_berr_counter bec;
147
148 u8 *cmd_msg_buffer;
149
150 struct mutex usb_8dev_cmd_lock;
151
152 };
153
154 /* tx frame */
155 struct __packed usb_8dev_tx_msg {
156 u8 begin;
157 u8 flags; /* RTR and EXT_ID flag */
158 __be32 id; /* upper 3 bits not used */
159 u8 dlc; /* data length code 0-8 bytes */
160 u8 data[8]; /* 64-bit data */
161 u8 end;
162 };
163
164 /* rx frame */
165 struct __packed usb_8dev_rx_msg {
166 u8 begin;
167 u8 type; /* frame type */
168 u8 flags; /* RTR and EXT_ID flag */
169 __be32 id; /* upper 3 bits not used */
170 u8 dlc; /* data length code 0-8 bytes */
171 u8 data[8]; /* 64-bit data */
172 __be32 timestamp; /* 32-bit timestamp */
173 u8 end;
174 };
175
176 /* command frame */
177 struct __packed usb_8dev_cmd_msg {
178 u8 begin;
179 u8 channel; /* unkown - always 0 */
180 u8 command; /* command to execute */
181 u8 opt1; /* optional parameter / return value */
182 u8 opt2; /* optional parameter 2 */
183 u8 data[10]; /* optional parameter and data */
184 u8 end;
185 };
186
187 static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size)
188 {
189 int actual_length;
190
191 return usb_bulk_msg(priv->udev,
192 usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX),
193 msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT);
194 }
195
196 static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size,
197 int *actual_length)
198 {
199 return usb_bulk_msg(priv->udev,
200 usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX),
201 msg, size, actual_length, USB_8DEV_CMD_TIMEOUT);
202 }
203
204 /* Send command to device and receive result.
205 * Command was successful when opt1 = 0.
206 */
207 static int usb_8dev_send_cmd(struct usb_8dev_priv *priv,
208 struct usb_8dev_cmd_msg *out,
209 struct usb_8dev_cmd_msg *in)
210 {
211 int err;
212 int num_bytes_read;
213 struct net_device *netdev;
214
215 netdev = priv->netdev;
216
217 out->begin = USB_8DEV_CMD_START;
218 out->end = USB_8DEV_CMD_END;
219
220 mutex_lock(&priv->usb_8dev_cmd_lock);
221
222 memcpy(priv->cmd_msg_buffer, out,
223 sizeof(struct usb_8dev_cmd_msg));
224
225 err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer,
226 sizeof(struct usb_8dev_cmd_msg));
227 if (err < 0) {
228 netdev_err(netdev, "sending command message failed\n");
229 goto failed;
230 }
231
232 err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer,
233 sizeof(struct usb_8dev_cmd_msg),
234 &num_bytes_read);
235 if (err < 0) {
236 netdev_err(netdev, "no command message answer\n");
237 goto failed;
238 }
239
240 memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg));
241
242 if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END ||
243 num_bytes_read != 16 || in->opt1 != 0)
244 err = -EPROTO;
245
246 failed:
247 mutex_unlock(&priv->usb_8dev_cmd_lock);
248 return err;
249 }
250
251 /* Send open command to device */
252 static int usb_8dev_cmd_open(struct usb_8dev_priv *priv)
253 {
254 struct can_bittiming *bt = &priv->can.bittiming;
255 struct usb_8dev_cmd_msg outmsg;
256 struct usb_8dev_cmd_msg inmsg;
257 u32 ctrlmode = priv->can.ctrlmode;
258 u32 flags = USB_8DEV_STATUS_FRAME;
259 __be32 beflags;
260 __be16 bebrp;
261
262 memset(&outmsg, 0, sizeof(outmsg));
263 outmsg.command = USB_8DEV_OPEN;
264 outmsg.opt1 = USB_8DEV_BAUD_MANUAL;
265 outmsg.data[0] = bt->prop_seg + bt->phase_seg1;
266 outmsg.data[1] = bt->phase_seg2;
267 outmsg.data[2] = bt->sjw;
268
269 /* BRP */
270 bebrp = cpu_to_be16((u16)bt->brp);
271 memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp));
272
273 /* flags */
274 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
275 flags |= USB_8DEV_LOOPBACK;
276 if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
277 flags |= USB_8DEV_SILENT;
278 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
279 flags |= USB_8DEV_DISABLE_AUTO_RESTRANS;
280
281 beflags = cpu_to_be32(flags);
282 memcpy(&outmsg.data[5], &beflags, sizeof(beflags));
283
284 return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
285 }
286
287 /* Send close command to device */
288 static int usb_8dev_cmd_close(struct usb_8dev_priv *priv)
289 {
290 struct usb_8dev_cmd_msg inmsg;
291 struct usb_8dev_cmd_msg outmsg = {
292 .channel = 0,
293 .command = USB_8DEV_CLOSE,
294 .opt1 = 0,
295 .opt2 = 0
296 };
297
298 return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
299 }
300
301 /* Get firmware and hardware version */
302 static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res)
303 {
304 struct usb_8dev_cmd_msg inmsg;
305 struct usb_8dev_cmd_msg outmsg = {
306 .channel = 0,
307 .command = USB_8DEV_GET_SOFTW_HARDW_VER,
308 .opt1 = 0,
309 .opt2 = 0
310 };
311
312 int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg);
313 if (err)
314 return err;
315
316 *res = be32_to_cpup((__be32 *)inmsg.data);
317
318 return err;
319 }
320
321 /* Set network device mode
322 *
323 * Maybe we should leave this function empty, because the device
324 * set mode variable with open command.
325 */
326 static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode)
327 {
328 struct usb_8dev_priv *priv = netdev_priv(netdev);
329 int err = 0;
330
331 switch (mode) {
332 case CAN_MODE_START:
333 err = usb_8dev_cmd_open(priv);
334 if (err)
335 netdev_warn(netdev, "couldn't start device");
336 break;
337
338 default:
339 return -EOPNOTSUPP;
340 }
341
342 return err;
343 }
344
345 /* Read error/status frames */
346 static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
347 struct usb_8dev_rx_msg *msg)
348 {
349 struct can_frame *cf;
350 struct sk_buff *skb;
351 struct net_device_stats *stats = &priv->netdev->stats;
352
353 /* Error message:
354 * byte 0: Status
355 * byte 1: bit 7: Receive Passive
356 * byte 1: bit 0-6: Receive Error Counter
357 * byte 2: Transmit Error Counter
358 * byte 3: Always 0 (maybe reserved for future use)
359 */
360
361 u8 state = msg->data[0];
362 u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK;
363 u8 txerr = msg->data[2];
364 int rx_errors = 0;
365 int tx_errors = 0;
366
367 skb = alloc_can_err_skb(priv->netdev, &cf);
368 if (!skb)
369 return;
370
371 switch (state) {
372 case USB_8DEV_STATUSMSG_OK:
373 priv->can.state = CAN_STATE_ERROR_ACTIVE;
374 cf->can_id |= CAN_ERR_PROT;
375 cf->data[2] = CAN_ERR_PROT_ACTIVE;
376 break;
377 case USB_8DEV_STATUSMSG_BUSOFF:
378 priv->can.state = CAN_STATE_BUS_OFF;
379 cf->can_id |= CAN_ERR_BUSOFF;
380 priv->can.can_stats.bus_off++;
381 can_bus_off(priv->netdev);
382 break;
383 case USB_8DEV_STATUSMSG_OVERRUN:
384 case USB_8DEV_STATUSMSG_BUSLIGHT:
385 case USB_8DEV_STATUSMSG_BUSHEAVY:
386 cf->can_id |= CAN_ERR_CRTL;
387 break;
388 default:
389 priv->can.state = CAN_STATE_ERROR_WARNING;
390 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
391 priv->can.can_stats.bus_error++;
392 break;
393 }
394
395 switch (state) {
396 case USB_8DEV_STATUSMSG_OK:
397 case USB_8DEV_STATUSMSG_BUSOFF:
398 break;
399 case USB_8DEV_STATUSMSG_ACK:
400 cf->can_id |= CAN_ERR_ACK;
401 tx_errors = 1;
402 break;
403 case USB_8DEV_STATUSMSG_CRC:
404 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
405 rx_errors = 1;
406 break;
407 case USB_8DEV_STATUSMSG_BIT0:
408 cf->data[2] |= CAN_ERR_PROT_BIT0;
409 tx_errors = 1;
410 break;
411 case USB_8DEV_STATUSMSG_BIT1:
412 cf->data[2] |= CAN_ERR_PROT_BIT1;
413 tx_errors = 1;
414 break;
415 case USB_8DEV_STATUSMSG_FORM:
416 cf->data[2] |= CAN_ERR_PROT_FORM;
417 rx_errors = 1;
418 break;
419 case USB_8DEV_STATUSMSG_STUFF:
420 cf->data[2] |= CAN_ERR_PROT_STUFF;
421 rx_errors = 1;
422 break;
423 case USB_8DEV_STATUSMSG_OVERRUN:
424 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
425 stats->rx_over_errors++;
426 rx_errors = 1;
427 break;
428 case USB_8DEV_STATUSMSG_BUSLIGHT:
429 priv->can.state = CAN_STATE_ERROR_WARNING;
430 cf->data[1] = (txerr > rxerr) ?
431 CAN_ERR_CRTL_TX_WARNING :
432 CAN_ERR_CRTL_RX_WARNING;
433 priv->can.can_stats.error_warning++;
434 break;
435 case USB_8DEV_STATUSMSG_BUSHEAVY:
436 priv->can.state = CAN_STATE_ERROR_PASSIVE;
437 cf->data[1] = (txerr > rxerr) ?
438 CAN_ERR_CRTL_TX_PASSIVE :
439 CAN_ERR_CRTL_RX_PASSIVE;
440 priv->can.can_stats.error_passive++;
441 break;
442 default:
443 netdev_warn(priv->netdev,
444 "Unknown status/error message (%d)\n", state);
445 break;
446 }
447
448 if (tx_errors) {
449 cf->data[2] |= CAN_ERR_PROT_TX;
450 stats->tx_errors++;
451 }
452
453 if (rx_errors)
454 stats->rx_errors++;
455
456 cf->data[6] = txerr;
457 cf->data[7] = rxerr;
458
459 priv->bec.txerr = txerr;
460 priv->bec.rxerr = rxerr;
461
462 stats->rx_packets++;
463 stats->rx_bytes += cf->can_dlc;
464 netif_rx(skb);
465 }
466
467 /* Read data and status frames */
468 static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
469 struct usb_8dev_rx_msg *msg)
470 {
471 struct can_frame *cf;
472 struct sk_buff *skb;
473 struct net_device_stats *stats = &priv->netdev->stats;
474
475 if (msg->type == USB_8DEV_TYPE_ERROR_FRAME &&
476 msg->flags == USB_8DEV_ERR_FLAG) {
477 usb_8dev_rx_err_msg(priv, msg);
478 } else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) {
479 skb = alloc_can_skb(priv->netdev, &cf);
480 if (!skb)
481 return;
482
483 cf->can_id = be32_to_cpu(msg->id);
484 cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
485
486 if (msg->flags & USB_8DEV_EXTID)
487 cf->can_id |= CAN_EFF_FLAG;
488
489 if (msg->flags & USB_8DEV_RTR)
490 cf->can_id |= CAN_RTR_FLAG;
491 else
492 memcpy(cf->data, msg->data, cf->can_dlc);
493
494 stats->rx_packets++;
495 stats->rx_bytes += cf->can_dlc;
496 netif_rx(skb);
497
498 can_led_event(priv->netdev, CAN_LED_EVENT_RX);
499 } else {
500 netdev_warn(priv->netdev, "frame type %d unknown",
501 msg->type);
502 }
503
504 }
505
506 /* Callback for reading data from device
507 *
508 * Check urb status, call read function and resubmit urb read operation.
509 */
510 static void usb_8dev_read_bulk_callback(struct urb *urb)
511 {
512 struct usb_8dev_priv *priv = urb->context;
513 struct net_device *netdev;
514 int retval;
515 int pos = 0;
516
517 netdev = priv->netdev;
518
519 if (!netif_device_present(netdev))
520 return;
521
522 switch (urb->status) {
523 case 0: /* success */
524 break;
525
526 case -ENOENT:
527 case -ESHUTDOWN:
528 return;
529
530 default:
531 netdev_info(netdev, "Rx URB aborted (%d)\n",
532 urb->status);
533 goto resubmit_urb;
534 }
535
536 while (pos < urb->actual_length) {
537 struct usb_8dev_rx_msg *msg;
538
539 if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) {
540 netdev_err(priv->netdev, "format error\n");
541 break;
542 }
543
544 msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos);
545 usb_8dev_rx_can_msg(priv, msg);
546
547 pos += sizeof(struct usb_8dev_rx_msg);
548 }
549
550 resubmit_urb:
551 usb_fill_bulk_urb(urb, priv->udev,
552 usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX),
553 urb->transfer_buffer, RX_BUFFER_SIZE,
554 usb_8dev_read_bulk_callback, priv);
555
556 retval = usb_submit_urb(urb, GFP_ATOMIC);
557
558 if (retval == -ENODEV)
559 netif_device_detach(netdev);
560 else if (retval)
561 netdev_err(netdev,
562 "failed resubmitting read bulk urb: %d\n", retval);
563 }
564
565 /* Callback handler for write operations
566 *
567 * Free allocated buffers, check transmit status and
568 * calculate statistic.
569 */
570 static void usb_8dev_write_bulk_callback(struct urb *urb)
571 {
572 struct usb_8dev_tx_urb_context *context = urb->context;
573 struct usb_8dev_priv *priv;
574 struct net_device *netdev;
575
576 BUG_ON(!context);
577
578 priv = context->priv;
579 netdev = priv->netdev;
580
581 /* free up our allocated buffer */
582 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
583 urb->transfer_buffer, urb->transfer_dma);
584
585 atomic_dec(&priv->active_tx_urbs);
586
587 if (!netif_device_present(netdev))
588 return;
589
590 if (urb->status)
591 netdev_info(netdev, "Tx URB aborted (%d)\n",
592 urb->status);
593
594 netdev->stats.tx_packets++;
595 netdev->stats.tx_bytes += context->dlc;
596
597 can_get_echo_skb(netdev, context->echo_index);
598
599 can_led_event(netdev, CAN_LED_EVENT_TX);
600
601 /* Release context */
602 context->echo_index = MAX_TX_URBS;
603
604 netif_wake_queue(netdev);
605 }
606
607 /* Send data to device */
608 static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
609 struct net_device *netdev)
610 {
611 struct usb_8dev_priv *priv = netdev_priv(netdev);
612 struct net_device_stats *stats = &netdev->stats;
613 struct can_frame *cf = (struct can_frame *) skb->data;
614 struct usb_8dev_tx_msg *msg;
615 struct urb *urb;
616 struct usb_8dev_tx_urb_context *context = NULL;
617 u8 *buf;
618 int i, err;
619 size_t size = sizeof(struct usb_8dev_tx_msg);
620
621 if (can_dropped_invalid_skb(netdev, skb))
622 return NETDEV_TX_OK;
623
624 /* create a URB, and a buffer for it, and copy the data to the URB */
625 urb = usb_alloc_urb(0, GFP_ATOMIC);
626 if (!urb) {
627 netdev_err(netdev, "No memory left for URBs\n");
628 goto nomem;
629 }
630
631 buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC,
632 &urb->transfer_dma);
633 if (!buf) {
634 netdev_err(netdev, "No memory left for USB buffer\n");
635 goto nomembuf;
636 }
637
638 memset(buf, 0, size);
639
640 msg = (struct usb_8dev_tx_msg *)buf;
641 msg->begin = USB_8DEV_DATA_START;
642 msg->flags = 0x00;
643
644 if (cf->can_id & CAN_RTR_FLAG)
645 msg->flags |= USB_8DEV_RTR;
646
647 if (cf->can_id & CAN_EFF_FLAG)
648 msg->flags |= USB_8DEV_EXTID;
649
650 msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
651 msg->dlc = cf->can_dlc;
652 memcpy(msg->data, cf->data, cf->can_dlc);
653 msg->end = USB_8DEV_DATA_END;
654
655 for (i = 0; i < MAX_TX_URBS; i++) {
656 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
657 context = &priv->tx_contexts[i];
658 break;
659 }
660 }
661
662 /* May never happen! When this happens we'd more URBs in flight as
663 * allowed (MAX_TX_URBS).
664 */
665 if (!context)
666 goto nofreecontext;
667
668 context->priv = priv;
669 context->echo_index = i;
670 context->dlc = cf->can_dlc;
671
672 usb_fill_bulk_urb(urb, priv->udev,
673 usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX),
674 buf, size, usb_8dev_write_bulk_callback, context);
675 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
676 usb_anchor_urb(urb, &priv->tx_submitted);
677
678 can_put_echo_skb(skb, netdev, context->echo_index);
679
680 atomic_inc(&priv->active_tx_urbs);
681
682 err = usb_submit_urb(urb, GFP_ATOMIC);
683 if (unlikely(err))
684 goto failed;
685 else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
686 /* Slow down tx path */
687 netif_stop_queue(netdev);
688
689 /* Release our reference to this URB, the USB core will eventually free
690 * it entirely.
691 */
692 usb_free_urb(urb);
693
694 return NETDEV_TX_OK;
695
696 nofreecontext:
697 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
698 usb_free_urb(urb);
699
700 netdev_warn(netdev, "couldn't find free context");
701
702 return NETDEV_TX_BUSY;
703
704 failed:
705 can_free_echo_skb(netdev, context->echo_index);
706
707 usb_unanchor_urb(urb);
708 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
709
710 atomic_dec(&priv->active_tx_urbs);
711
712 if (err == -ENODEV)
713 netif_device_detach(netdev);
714 else
715 netdev_warn(netdev, "failed tx_urb %d\n", err);
716
717 nomembuf:
718 usb_free_urb(urb);
719
720 nomem:
721 dev_kfree_skb(skb);
722 stats->tx_dropped++;
723
724 return NETDEV_TX_OK;
725 }
726
727 static int usb_8dev_get_berr_counter(const struct net_device *netdev,
728 struct can_berr_counter *bec)
729 {
730 struct usb_8dev_priv *priv = netdev_priv(netdev);
731
732 bec->txerr = priv->bec.txerr;
733 bec->rxerr = priv->bec.rxerr;
734
735 return 0;
736 }
737
738 /* Start USB device */
739 static int usb_8dev_start(struct usb_8dev_priv *priv)
740 {
741 struct net_device *netdev = priv->netdev;
742 int err, i;
743
744 for (i = 0; i < MAX_RX_URBS; i++) {
745 struct urb *urb = NULL;
746 u8 *buf;
747
748 /* create a URB, and a buffer for it */
749 urb = usb_alloc_urb(0, GFP_KERNEL);
750 if (!urb) {
751 netdev_err(netdev, "No memory left for URBs\n");
752 err = -ENOMEM;
753 break;
754 }
755
756 buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL,
757 &urb->transfer_dma);
758 if (!buf) {
759 netdev_err(netdev, "No memory left for USB buffer\n");
760 usb_free_urb(urb);
761 err = -ENOMEM;
762 break;
763 }
764
765 usb_fill_bulk_urb(urb, priv->udev,
766 usb_rcvbulkpipe(priv->udev,
767 USB_8DEV_ENDP_DATA_RX),
768 buf, RX_BUFFER_SIZE,
769 usb_8dev_read_bulk_callback, priv);
770 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
771 usb_anchor_urb(urb, &priv->rx_submitted);
772
773 err = usb_submit_urb(urb, GFP_KERNEL);
774 if (err) {
775 usb_unanchor_urb(urb);
776 usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf,
777 urb->transfer_dma);
778 usb_free_urb(urb);
779 break;
780 }
781
782 /* Drop reference, USB core will take care of freeing it */
783 usb_free_urb(urb);
784 }
785
786 /* Did we submit any URBs */
787 if (i == 0) {
788 netdev_warn(netdev, "couldn't setup read URBs\n");
789 return err;
790 }
791
792 /* Warn if we've couldn't transmit all the URBs */
793 if (i < MAX_RX_URBS)
794 netdev_warn(netdev, "rx performance may be slow\n");
795
796 err = usb_8dev_cmd_open(priv);
797 if (err)
798 goto failed;
799
800 priv->can.state = CAN_STATE_ERROR_ACTIVE;
801
802 return 0;
803
804 failed:
805 if (err == -ENODEV)
806 netif_device_detach(priv->netdev);
807
808 netdev_warn(netdev, "couldn't submit control: %d\n", err);
809
810 return err;
811 }
812
813 /* Open USB device */
814 static int usb_8dev_open(struct net_device *netdev)
815 {
816 struct usb_8dev_priv *priv = netdev_priv(netdev);
817 int err;
818
819 /* common open */
820 err = open_candev(netdev);
821 if (err)
822 return err;
823
824 can_led_event(netdev, CAN_LED_EVENT_OPEN);
825
826 /* finally start device */
827 err = usb_8dev_start(priv);
828 if (err) {
829 if (err == -ENODEV)
830 netif_device_detach(priv->netdev);
831
832 netdev_warn(netdev, "couldn't start device: %d\n",
833 err);
834
835 close_candev(netdev);
836
837 return err;
838 }
839
840 netif_start_queue(netdev);
841
842 return 0;
843 }
844
845 static void unlink_all_urbs(struct usb_8dev_priv *priv)
846 {
847 int i;
848
849 usb_kill_anchored_urbs(&priv->rx_submitted);
850
851 usb_kill_anchored_urbs(&priv->tx_submitted);
852 atomic_set(&priv->active_tx_urbs, 0);
853
854 for (i = 0; i < MAX_TX_URBS; i++)
855 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
856 }
857
858 /* Close USB device */
859 static int usb_8dev_close(struct net_device *netdev)
860 {
861 struct usb_8dev_priv *priv = netdev_priv(netdev);
862 int err = 0;
863
864 /* Send CLOSE command to CAN controller */
865 err = usb_8dev_cmd_close(priv);
866 if (err)
867 netdev_warn(netdev, "couldn't stop device");
868
869 priv->can.state = CAN_STATE_STOPPED;
870
871 netif_stop_queue(netdev);
872
873 /* Stop polling */
874 unlink_all_urbs(priv);
875
876 close_candev(netdev);
877
878 can_led_event(netdev, CAN_LED_EVENT_STOP);
879
880 return err;
881 }
882
883 static const struct net_device_ops usb_8dev_netdev_ops = {
884 .ndo_open = usb_8dev_open,
885 .ndo_stop = usb_8dev_close,
886 .ndo_start_xmit = usb_8dev_start_xmit,
887 .ndo_change_mtu = can_change_mtu,
888 };
889
890 static const struct can_bittiming_const usb_8dev_bittiming_const = {
891 .name = "usb_8dev",
892 .tseg1_min = 1,
893 .tseg1_max = 16,
894 .tseg2_min = 1,
895 .tseg2_max = 8,
896 .sjw_max = 4,
897 .brp_min = 1,
898 .brp_max = 1024,
899 .brp_inc = 1,
900 };
901
902 /* Probe USB device
903 *
904 * Check device and firmware.
905 * Set supported modes and bittiming constants.
906 * Allocate some memory.
907 */
908 static int usb_8dev_probe(struct usb_interface *intf,
909 const struct usb_device_id *id)
910 {
911 struct net_device *netdev;
912 struct usb_8dev_priv *priv;
913 int i, err = -ENOMEM;
914 u32 version;
915 char buf[18];
916 struct usb_device *usbdev = interface_to_usbdev(intf);
917
918 /* product id looks strange, better we also check iProduct string */
919 if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
920 sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
921 dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
922 return -ENODEV;
923 }
924
925 netdev = alloc_candev(sizeof(struct usb_8dev_priv), MAX_TX_URBS);
926 if (!netdev) {
927 dev_err(&intf->dev, "Couldn't alloc candev\n");
928 return -ENOMEM;
929 }
930
931 priv = netdev_priv(netdev);
932
933 priv->udev = usbdev;
934 priv->netdev = netdev;
935
936 priv->can.state = CAN_STATE_STOPPED;
937 priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
938 priv->can.bittiming_const = &usb_8dev_bittiming_const;
939 priv->can.do_set_mode = usb_8dev_set_mode;
940 priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
941 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
942 CAN_CTRLMODE_LISTENONLY |
943 CAN_CTRLMODE_ONE_SHOT;
944
945 netdev->netdev_ops = &usb_8dev_netdev_ops;
946
947 netdev->flags |= IFF_ECHO; /* we support local echo */
948
949 init_usb_anchor(&priv->rx_submitted);
950
951 init_usb_anchor(&priv->tx_submitted);
952 atomic_set(&priv->active_tx_urbs, 0);
953
954 for (i = 0; i < MAX_TX_URBS; i++)
955 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
956
957 priv->cmd_msg_buffer = kzalloc(sizeof(struct usb_8dev_cmd_msg),
958 GFP_KERNEL);
959 if (!priv->cmd_msg_buffer)
960 goto cleanup_candev;
961
962 usb_set_intfdata(intf, priv);
963
964 SET_NETDEV_DEV(netdev, &intf->dev);
965
966 mutex_init(&priv->usb_8dev_cmd_lock);
967
968 err = register_candev(netdev);
969 if (err) {
970 netdev_err(netdev,
971 "couldn't register CAN device: %d\n", err);
972 goto cleanup_cmd_msg_buffer;
973 }
974
975 err = usb_8dev_cmd_version(priv, &version);
976 if (err) {
977 netdev_err(netdev, "can't get firmware version\n");
978 goto cleanup_unregister_candev;
979 } else {
980 netdev_info(netdev,
981 "firmware: %d.%d, hardware: %d.%d\n",
982 (version>>24) & 0xff, (version>>16) & 0xff,
983 (version>>8) & 0xff, version & 0xff);
984 }
985
986 devm_can_led_init(netdev);
987
988 return 0;
989
990 cleanup_unregister_candev:
991 unregister_netdev(priv->netdev);
992
993 cleanup_cmd_msg_buffer:
994 kfree(priv->cmd_msg_buffer);
995
996 cleanup_candev:
997 free_candev(netdev);
998
999 return err;
1000
1001 }
1002
1003 /* Called by the usb core when driver is unloaded or device is removed */
1004 static void usb_8dev_disconnect(struct usb_interface *intf)
1005 {
1006 struct usb_8dev_priv *priv = usb_get_intfdata(intf);
1007
1008 usb_set_intfdata(intf, NULL);
1009
1010 if (priv) {
1011 netdev_info(priv->netdev, "device disconnected\n");
1012
1013 unregister_netdev(priv->netdev);
1014 free_candev(priv->netdev);
1015
1016 unlink_all_urbs(priv);
1017 }
1018
1019 }
1020
1021 static struct usb_driver usb_8dev_driver = {
1022 .name = "usb_8dev",
1023 .probe = usb_8dev_probe,
1024 .disconnect = usb_8dev_disconnect,
1025 .id_table = usb_8dev_table,
1026 };
1027
1028 module_usb_driver(usb_8dev_driver);
1029
1030 MODULE_AUTHOR("Bernd Krumboeck <krumboeck@universalnet.at>");
1031 MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces");
1032 MODULE_LICENSE("GPL v2");
CRIS linux kernel tree