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Merge branch 'fix/rt5645' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[deliverable/linux.git] / drivers / net / can / usb / usb_8dev.c
CommitLineData
0024d8ad
BK		 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
0024d8ad
BK		 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>
e2d5f2c7 35#include <linux/can/led.h>
0024d8ad
BK		 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 */
47enum 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 */
64enum 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 */
117static const struct usb_device_id usb_8dev_table[] = {
118 { USB_DEVICE(USB_8DEV_VENDOR_ID, USB_8DEV_PRODUCT_ID) },
119 { } /* Terminating entry */
120};
121
122MODULE_DEVICE_TABLE(usb, usb_8dev_table);
123
124struct 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 */
132struct 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 */
155struct __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 */
165struct __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 */
177struct __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
187static 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
196static 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 */
207static 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
246failed:
247 mutex_unlock(&priv->usb_8dev_cmd_lock);
248 return err;
249}
250
251/* Send open command to device */
252static 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 */
288static 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 */
302static 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 */
326static 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 */
346static 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;
be38a6f9 380 priv->can.can_stats.bus_off++;
0024d8ad
BK		 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[2] |= CAN_ERR_PROT_UNSPEC;
405 cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ |
406 CAN_ERR_PROT_LOC_CRC_DEL;
407 rx_errors = 1;
408 break;
409 case USB_8DEV_STATUSMSG_BIT0:
410 cf->data[2] |= CAN_ERR_PROT_BIT0;
411 tx_errors = 1;
412 break;
413 case USB_8DEV_STATUSMSG_BIT1:
414 cf->data[2] |= CAN_ERR_PROT_BIT1;
415 tx_errors = 1;
416 break;
417 case USB_8DEV_STATUSMSG_FORM:
418 cf->data[2] |= CAN_ERR_PROT_FORM;
419 rx_errors = 1;
420 break;
421 case USB_8DEV_STATUSMSG_STUFF:
422 cf->data[2] |= CAN_ERR_PROT_STUFF;
423 rx_errors = 1;
424 break;
425 case USB_8DEV_STATUSMSG_OVERRUN:
426 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
427 stats->rx_over_errors++;
428 rx_errors = 1;
429 break;
430 case USB_8DEV_STATUSMSG_BUSLIGHT:
431 priv->can.state = CAN_STATE_ERROR_WARNING;
432 cf->data[1] = (txerr > rxerr) ?
433 CAN_ERR_CRTL_TX_WARNING :
434 CAN_ERR_CRTL_RX_WARNING;
435 priv->can.can_stats.error_warning++;
436 break;
437 case USB_8DEV_STATUSMSG_BUSHEAVY:
438 priv->can.state = CAN_STATE_ERROR_PASSIVE;
439 cf->data[1] = (txerr > rxerr) ?
440 CAN_ERR_CRTL_TX_PASSIVE :
441 CAN_ERR_CRTL_RX_PASSIVE;
442 priv->can.can_stats.error_passive++;
443 break;
444 default:
445 netdev_warn(priv->netdev,
446 "Unknown status/error message (%d)\n", state);
447 break;
448 }
449
450 if (tx_errors) {
451 cf->data[2] |= CAN_ERR_PROT_TX;
452 stats->tx_errors++;
453 }
454
455 if (rx_errors)
456 stats->rx_errors++;
457
458 cf->data[6] = txerr;
459 cf->data[7] = rxerr;
460
461 priv->bec.txerr = txerr;
462 priv->bec.rxerr = rxerr;
463
0024d8ad
BK		 464 stats->rx_packets++;
465 stats->rx_bytes += cf->can_dlc;
9b721a4c 466 netif_rx(skb);
0024d8ad
BK		 467}
468
469/* Read data and status frames */
470static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
471 struct usb_8dev_rx_msg *msg)
472{
473 struct can_frame *cf;
474 struct sk_buff *skb;
475 struct net_device_stats *stats = &priv->netdev->stats;
476
477 if (msg->type == USB_8DEV_TYPE_ERROR_FRAME &&
478 msg->flags == USB_8DEV_ERR_FLAG) {
479 usb_8dev_rx_err_msg(priv, msg);
480 } else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) {
481 skb = alloc_can_skb(priv->netdev, &cf);
482 if (!skb)
483 return;
484
485 cf->can_id = be32_to_cpu(msg->id);
486 cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
487
488 if (msg->flags & USB_8DEV_EXTID)
489 cf->can_id |= CAN_EFF_FLAG;
490
491 if (msg->flags & USB_8DEV_RTR)
492 cf->can_id |= CAN_RTR_FLAG;
493 else
494 memcpy(cf->data, msg->data, cf->can_dlc);
495
0024d8ad
BK		 496 stats->rx_packets++;
497 stats->rx_bytes += cf->can_dlc;
9b721a4c 498 netif_rx(skb);
e2d5f2c7
BK		 499
500 can_led_event(priv->netdev, CAN_LED_EVENT_RX);
0024d8ad
BK		 501 } else {
502 netdev_warn(priv->netdev, "frame type %d unknown",
503 msg->type);
504 }
505
506}
507
508/* Callback for reading data from device
509 *
510 * Check urb status, call read function and resubmit urb read operation.
511 */
512static void usb_8dev_read_bulk_callback(struct urb *urb)
513{
514 struct usb_8dev_priv *priv = urb->context;
515 struct net_device *netdev;
516 int retval;
517 int pos = 0;
518
519 netdev = priv->netdev;
520
521 if (!netif_device_present(netdev))
522 return;
523
524 switch (urb->status) {
525 case 0: /* success */
526 break;
527
528 case -ENOENT:
529 case -ESHUTDOWN:
530 return;
531
532 default:
533 netdev_info(netdev, "Rx URB aborted (%d)\n",
534 urb->status);
535 goto resubmit_urb;
536 }
537
538 while (pos < urb->actual_length) {
539 struct usb_8dev_rx_msg *msg;
540
541 if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) {
542 netdev_err(priv->netdev, "format error\n");
543 break;
544 }
545
546 msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos);
547 usb_8dev_rx_can_msg(priv, msg);
548
549 pos += sizeof(struct usb_8dev_rx_msg);
550 }
551
552resubmit_urb:
553 usb_fill_bulk_urb(urb, priv->udev,
554 usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX),
555 urb->transfer_buffer, RX_BUFFER_SIZE,
556 usb_8dev_read_bulk_callback, priv);
557
558 retval = usb_submit_urb(urb, GFP_ATOMIC);
559
560 if (retval == -ENODEV)
561 netif_device_detach(netdev);
562 else if (retval)
563 netdev_err(netdev,
564 "failed resubmitting read bulk urb: %d\n", retval);
565}
566
567/* Callback handler for write operations
568 *
569 * Free allocated buffers, check transmit status and
570 * calculate statistic.
571 */
572static void usb_8dev_write_bulk_callback(struct urb *urb)
573{
574 struct usb_8dev_tx_urb_context *context = urb->context;
575 struct usb_8dev_priv *priv;
576 struct net_device *netdev;
577
578 BUG_ON(!context);
579
580 priv = context->priv;
581 netdev = priv->netdev;
582
583 /* free up our allocated buffer */
584 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
585 urb->transfer_buffer, urb->transfer_dma);
586
587 atomic_dec(&priv->active_tx_urbs);
588
589 if (!netif_device_present(netdev))
590 return;
591
592 if (urb->status)
593 netdev_info(netdev, "Tx URB aborted (%d)\n",
594 urb->status);
595
596 netdev->stats.tx_packets++;
597 netdev->stats.tx_bytes += context->dlc;
598
599 can_get_echo_skb(netdev, context->echo_index);
600
e2d5f2c7
BK		 601 can_led_event(netdev, CAN_LED_EVENT_TX);
602
0024d8ad
BK		 603 /* Release context */
604 context->echo_index = MAX_TX_URBS;
605
606 netif_wake_queue(netdev);
607}
608
609/* Send data to device */
610static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
611 struct net_device *netdev)
612{
613 struct usb_8dev_priv *priv = netdev_priv(netdev);
614 struct net_device_stats *stats = &netdev->stats;
615 struct can_frame *cf = (struct can_frame *) skb->data;
616 struct usb_8dev_tx_msg *msg;
617 struct urb *urb;
618 struct usb_8dev_tx_urb_context *context = NULL;
619 u8 *buf;
620 int i, err;
621 size_t size = sizeof(struct usb_8dev_tx_msg);
622
623 if (can_dropped_invalid_skb(netdev, skb))
624 return NETDEV_TX_OK;
625
626 /* create a URB, and a buffer for it, and copy the data to the URB */
627 urb = usb_alloc_urb(0, GFP_ATOMIC);
628 if (!urb) {
629 netdev_err(netdev, "No memory left for URBs\n");
630 goto nomem;
631 }
632
633 buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC,
634 &urb->transfer_dma);
635 if (!buf) {
636 netdev_err(netdev, "No memory left for USB buffer\n");
637 goto nomembuf;
638 }
639
640 memset(buf, 0, size);
641
642 msg = (struct usb_8dev_tx_msg *)buf;
643 msg->begin = USB_8DEV_DATA_START;
644 msg->flags = 0x00;
645
646 if (cf->can_id & CAN_RTR_FLAG)
647 msg->flags |= USB_8DEV_RTR;
648
649 if (cf->can_id & CAN_EFF_FLAG)
650 msg->flags |= USB_8DEV_EXTID;
651
652 msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
653 msg->dlc = cf->can_dlc;
654 memcpy(msg->data, cf->data, cf->can_dlc);
655 msg->end = USB_8DEV_DATA_END;
656
657 for (i = 0; i < MAX_TX_URBS; i++) {
658 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
659 context = &priv->tx_contexts[i];
660 break;
661 }
662 }
663
664 /* May never happen! When this happens we'd more URBs in flight as
665 * allowed (MAX_TX_URBS).
666 */
667 if (!context)
668 goto nofreecontext;
669
670 context->priv = priv;
671 context->echo_index = i;
672 context->dlc = cf->can_dlc;
673
674 usb_fill_bulk_urb(urb, priv->udev,
675 usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX),
676 buf, size, usb_8dev_write_bulk_callback, context);
677 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
678 usb_anchor_urb(urb, &priv->tx_submitted);
679
680 can_put_echo_skb(skb, netdev, context->echo_index);
681
682 atomic_inc(&priv->active_tx_urbs);
683
684 err = usb_submit_urb(urb, GFP_ATOMIC);
685 if (unlikely(err))
686 goto failed;
687 else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
688 /* Slow down tx path */
689 netif_stop_queue(netdev);
690
691 /* Release our reference to this URB, the USB core will eventually free
692 * it entirely.
693 */
694 usb_free_urb(urb);
695
696 return NETDEV_TX_OK;
697
698nofreecontext:
0024d8ad 699 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
636d0375 700 usb_free_urb(urb);
0024d8ad
BK		 701
702 netdev_warn(netdev, "couldn't find free context");
703
704 return NETDEV_TX_BUSY;
705
706failed:
707 can_free_echo_skb(netdev, context->echo_index);
708
709 usb_unanchor_urb(urb);
710 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
711
712 atomic_dec(&priv->active_tx_urbs);
713
714 if (err == -ENODEV)
715 netif_device_detach(netdev);
716 else
717 netdev_warn(netdev, "failed tx_urb %d\n", err);
718
719nomembuf:
720 usb_free_urb(urb);
721
722nomem:
723 dev_kfree_skb(skb);
724 stats->tx_dropped++;
725
726 return NETDEV_TX_OK;
727}
728
729static int usb_8dev_get_berr_counter(const struct net_device *netdev,
730 struct can_berr_counter *bec)
731{
732 struct usb_8dev_priv *priv = netdev_priv(netdev);
733
734 bec->txerr = priv->bec.txerr;
735 bec->rxerr = priv->bec.rxerr;
736
737 return 0;
738}
739
740/* Start USB device */
741static int usb_8dev_start(struct usb_8dev_priv *priv)
742{
743 struct net_device *netdev = priv->netdev;
744 int err, i;
745
746 for (i = 0; i < MAX_RX_URBS; i++) {
747 struct urb *urb = NULL;
748 u8 *buf;
749
750 /* create a URB, and a buffer for it */
751 urb = usb_alloc_urb(0, GFP_KERNEL);
752 if (!urb) {
753 netdev_err(netdev, "No memory left for URBs\n");
754 err = -ENOMEM;
755 break;
756 }
757
758 buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL,
759 &urb->transfer_dma);
760 if (!buf) {
761 netdev_err(netdev, "No memory left for USB buffer\n");
762 usb_free_urb(urb);
763 err = -ENOMEM;
764 break;
765 }
766
767 usb_fill_bulk_urb(urb, priv->udev,
768 usb_rcvbulkpipe(priv->udev,
769 USB_8DEV_ENDP_DATA_RX),
770 buf, RX_BUFFER_SIZE,
771 usb_8dev_read_bulk_callback, priv);
772 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
773 usb_anchor_urb(urb, &priv->rx_submitted);
774
775 err = usb_submit_urb(urb, GFP_KERNEL);
776 if (err) {
777 usb_unanchor_urb(urb);
778 usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf,
779 urb->transfer_dma);
76719868 780 usb_free_urb(urb);
0024d8ad
BK		 781 break;
782 }
783
784 /* Drop reference, USB core will take care of freeing it */
785 usb_free_urb(urb);
786 }
787
788 /* Did we submit any URBs */
789 if (i == 0) {
790 netdev_warn(netdev, "couldn't setup read URBs\n");
791 return err;
792 }
793
794 /* Warn if we've couldn't transmit all the URBs */
795 if (i < MAX_RX_URBS)
796 netdev_warn(netdev, "rx performance may be slow\n");
797
798 err = usb_8dev_cmd_open(priv);
799 if (err)
800 goto failed;
801
802 priv->can.state = CAN_STATE_ERROR_ACTIVE;
803
804 return 0;
805
806failed:
807 if (err == -ENODEV)
808 netif_device_detach(priv->netdev);
809
810 netdev_warn(netdev, "couldn't submit control: %d\n", err);
811
812 return err;
813}
814
815/* Open USB device */
816static int usb_8dev_open(struct net_device *netdev)
817{
818 struct usb_8dev_priv *priv = netdev_priv(netdev);
819 int err;
820
821 /* common open */
822 err = open_candev(netdev);
823 if (err)
824 return err;
825
e2d5f2c7
BK		 826 can_led_event(netdev, CAN_LED_EVENT_OPEN);
827
0024d8ad
BK		 828 /* finally start device */
829 err = usb_8dev_start(priv);
830 if (err) {
831 if (err == -ENODEV)
832 netif_device_detach(priv->netdev);
833
834 netdev_warn(netdev, "couldn't start device: %d\n",
835 err);
836
837 close_candev(netdev);
838
839 return err;
840 }
841
842 netif_start_queue(netdev);
843
844 return 0;
845}
846
847static void unlink_all_urbs(struct usb_8dev_priv *priv)
848{
849 int i;
850
851 usb_kill_anchored_urbs(&priv->rx_submitted);
852
853 usb_kill_anchored_urbs(&priv->tx_submitted);
854 atomic_set(&priv->active_tx_urbs, 0);
855
856 for (i = 0; i < MAX_TX_URBS; i++)
857 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
858}
859
860/* Close USB device */
861static int usb_8dev_close(struct net_device *netdev)
862{
863 struct usb_8dev_priv *priv = netdev_priv(netdev);
864 int err = 0;
865
866 /* Send CLOSE command to CAN controller */
867 err = usb_8dev_cmd_close(priv);
868 if (err)
869 netdev_warn(netdev, "couldn't stop device");
870
871 priv->can.state = CAN_STATE_STOPPED;
872
873 netif_stop_queue(netdev);
874
875 /* Stop polling */
876 unlink_all_urbs(priv);
877
878 close_candev(netdev);
879
e2d5f2c7
BK		 880 can_led_event(netdev, CAN_LED_EVENT_STOP);
881
0024d8ad
BK		 882 return err;
883}
884
885static const struct net_device_ops usb_8dev_netdev_ops = {
886 .ndo_open = usb_8dev_open,
887 .ndo_stop = usb_8dev_close,
888 .ndo_start_xmit = usb_8dev_start_xmit,
c971fa2a 889 .ndo_change_mtu = can_change_mtu,
0024d8ad
BK		 890};
891
892static const struct can_bittiming_const usb_8dev_bittiming_const = {
893 .name = "usb_8dev",
894 .tseg1_min = 1,
895 .tseg1_max = 16,
896 .tseg2_min = 1,
897 .tseg2_max = 8,
898 .sjw_max = 4,
899 .brp_min = 1,
900 .brp_max = 1024,
901 .brp_inc = 1,
902};
903
904/* Probe USB device
905 *
906 * Check device and firmware.
907 * Set supported modes and bittiming constants.
908 * Allocate some memory.
909 */
910static int usb_8dev_probe(struct usb_interface *intf,
911 const struct usb_device_id *id)
912{
913 struct net_device *netdev;
914 struct usb_8dev_priv *priv;
915 int i, err = -ENOMEM;
916 u32 version;
917 char buf[18];
918 struct usb_device *usbdev = interface_to_usbdev(intf);
919
920 /* product id looks strange, better we also check iProduct string */
921 if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
922 sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
923 dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
924 return -ENODEV;
925 }
926
927 netdev = alloc_candev(sizeof(struct usb_8dev_priv), MAX_TX_URBS);
928 if (!netdev) {
929 dev_err(&intf->dev, "Couldn't alloc candev\n");
930 return -ENOMEM;
931 }
932
933 priv = netdev_priv(netdev);
934
935 priv->udev = usbdev;
936 priv->netdev = netdev;
937
938 priv->can.state = CAN_STATE_STOPPED;
939 priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
940 priv->can.bittiming_const = &usb_8dev_bittiming_const;
941 priv->can.do_set_mode = usb_8dev_set_mode;
942 priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
943 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
944 CAN_CTRLMODE_LISTENONLY |
945 CAN_CTRLMODE_ONE_SHOT;
946
947 netdev->netdev_ops = &usb_8dev_netdev_ops;
948
949 netdev->flags |= IFF_ECHO; /* we support local echo */
950
951 init_usb_anchor(&priv->rx_submitted);
952
953 init_usb_anchor(&priv->tx_submitted);
954 atomic_set(&priv->active_tx_urbs, 0);
955
956 for (i = 0; i < MAX_TX_URBS; i++)
957 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
958
959 priv->cmd_msg_buffer = kzalloc(sizeof(struct usb_8dev_cmd_msg),
960 GFP_KERNEL);
09da6c5f 961 if (!priv->cmd_msg_buffer)
0024d8ad 962 goto cleanup_candev;
0024d8ad
BK		 963
964 usb_set_intfdata(intf, priv);
965
966 SET_NETDEV_DEV(netdev, &intf->dev);
967
968 mutex_init(&priv->usb_8dev_cmd_lock);
969
970 err = register_candev(netdev);
971 if (err) {
972 netdev_err(netdev,
973 "couldn't register CAN device: %d\n", err);
974 goto cleanup_cmd_msg_buffer;
975 }
976
977 err = usb_8dev_cmd_version(priv, &version);
978 if (err) {
979 netdev_err(netdev, "can't get firmware version\n");
4afe2156 980 goto cleanup_unregister_candev;
0024d8ad
BK		 981 } else {
982 netdev_info(netdev,
983 "firmware: %d.%d, hardware: %d.%d\n",
984 (version>>24) & 0xff, (version>>16) & 0xff,
985 (version>>8) & 0xff, version & 0xff);
986 }
987
e2d5f2c7
BK		 988 devm_can_led_init(netdev);
989
0024d8ad
BK		 990 return 0;
991
4afe2156
MKB		 992cleanup_unregister_candev:
993 unregister_netdev(priv->netdev);
994
0024d8ad
BK		 995cleanup_cmd_msg_buffer:
996 kfree(priv->cmd_msg_buffer);
997
998cleanup_candev:
999 free_candev(netdev);
1000
1001 return err;
1002
1003}
1004
1005/* Called by the usb core when driver is unloaded or device is removed */
1006static void usb_8dev_disconnect(struct usb_interface *intf)
1007{
1008 struct usb_8dev_priv *priv = usb_get_intfdata(intf);
1009
1010 usb_set_intfdata(intf, NULL);
1011
1012 if (priv) {
1013 netdev_info(priv->netdev, "device disconnected\n");
1014
1015 unregister_netdev(priv->netdev);
1016 free_candev(priv->netdev);
1017
1018 unlink_all_urbs(priv);
1019 }
1020
1021}
1022
1023static struct usb_driver usb_8dev_driver = {
1024 .name = "usb_8dev",
1025 .probe = usb_8dev_probe,
1026 .disconnect = usb_8dev_disconnect,
1027 .id_table = usb_8dev_table,
1028};
1029
1030module_usb_driver(usb_8dev_driver);
1031
1032MODULE_AUTHOR("Bernd Krumboeck <krumboeck@universalnet.at>");
1033MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces");
1034MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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