Commit | Line | Data |
---|---|---|
96d8e903 MF |
1 | /* |
2 | * CAN driver for esd CAN-USB/2 | |
3 | * | |
4 | * Copyright (C) 2010 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 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 | ||
38 | #define ESD_USB2_CAN_CLOCK 60000000 | |
39 | #define ESD_USB2_MAX_NETS 2 | |
40 | ||
41 | /* USB2 commands */ | |
42 | #define CMD_VERSION 1 /* also used for VERSION_REPLY */ | |
43 | #define CMD_CAN_RX 2 /* device to host only */ | |
44 | #define CMD_CAN_TX 3 /* also used for TX_DONE */ | |
45 | #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ | |
46 | #define CMD_TS 5 /* also used for TS_REPLY */ | |
47 | #define CMD_IDADD 6 /* also used for IDADD_REPLY */ | |
48 | ||
49 | /* esd CAN message flags - dlc field */ | |
50 | #define ESD_RTR 0x10 | |
51 | ||
52 | /* esd CAN message flags - id field */ | |
53 | #define ESD_EXTID 0x20000000 | |
54 | #define ESD_EVENT 0x40000000 | |
55 | #define ESD_IDMASK 0x1fffffff | |
56 | ||
57 | /* esd CAN event ids used by this driver */ | |
58 | #define ESD_EV_CAN_ERROR_EXT 2 | |
59 | ||
60 | /* baudrate message flags */ | |
61 | #define ESD_USB2_UBR 0x80000000 | |
62 | #define ESD_USB2_LOM 0x40000000 | |
63 | #define ESD_USB2_NO_BAUDRATE 0x7fffffff | |
64 | #define ESD_USB2_TSEG1_MIN 1 | |
65 | #define ESD_USB2_TSEG1_MAX 16 | |
66 | #define ESD_USB2_TSEG1_SHIFT 16 | |
67 | #define ESD_USB2_TSEG2_MIN 1 | |
68 | #define ESD_USB2_TSEG2_MAX 8 | |
69 | #define ESD_USB2_TSEG2_SHIFT 20 | |
70 | #define ESD_USB2_SJW_MAX 4 | |
71 | #define ESD_USB2_SJW_SHIFT 14 | |
72 | #define ESD_USB2_BRP_MIN 1 | |
73 | #define ESD_USB2_BRP_MAX 1024 | |
74 | #define ESD_USB2_BRP_INC 1 | |
75 | #define ESD_USB2_3_SAMPLES 0x00800000 | |
76 | ||
77 | /* esd IDADD message */ | |
78 | #define ESD_ID_ENABLE 0x80 | |
79 | #define ESD_MAX_ID_SEGMENT 64 | |
80 | ||
81 | /* SJA1000 ECC register (emulated by usb2 firmware) */ | |
82 | #define SJA1000_ECC_SEG 0x1F | |
83 | #define SJA1000_ECC_DIR 0x20 | |
84 | #define SJA1000_ECC_ERR 0x06 | |
85 | #define SJA1000_ECC_BIT 0x00 | |
86 | #define SJA1000_ECC_FORM 0x40 | |
87 | #define SJA1000_ECC_STUFF 0x80 | |
88 | #define SJA1000_ECC_MASK 0xc0 | |
89 | ||
90 | /* esd bus state event codes */ | |
91 | #define ESD_BUSSTATE_MASK 0xc0 | |
92 | #define ESD_BUSSTATE_WARN 0x40 | |
93 | #define ESD_BUSSTATE_ERRPASSIVE 0x80 | |
94 | #define ESD_BUSSTATE_BUSOFF 0xc0 | |
95 | ||
96 | #define RX_BUFFER_SIZE 1024 | |
97 | #define MAX_RX_URBS 4 | |
98 | #define MAX_TX_URBS 16 /* must be power of 2 */ | |
99 | ||
100 | struct header_msg { | |
101 | u8 len; /* len is always the total message length in 32bit words */ | |
102 | u8 cmd; | |
103 | u8 rsvd[2]; | |
104 | }; | |
105 | ||
106 | struct version_msg { | |
107 | u8 len; | |
108 | u8 cmd; | |
109 | u8 rsvd; | |
110 | u8 flags; | |
111 | __le32 drv_version; | |
112 | }; | |
113 | ||
114 | struct version_reply_msg { | |
115 | u8 len; | |
116 | u8 cmd; | |
117 | u8 nets; | |
118 | u8 features; | |
119 | __le32 version; | |
120 | u8 name[16]; | |
121 | __le32 rsvd; | |
122 | __le32 ts; | |
123 | }; | |
124 | ||
125 | struct rx_msg { | |
126 | u8 len; | |
127 | u8 cmd; | |
128 | u8 net; | |
129 | u8 dlc; | |
130 | __le32 ts; | |
131 | __le32 id; /* upper 3 bits contain flags */ | |
132 | u8 data[8]; | |
133 | }; | |
134 | ||
135 | struct tx_msg { | |
136 | u8 len; | |
137 | u8 cmd; | |
138 | u8 net; | |
139 | u8 dlc; | |
140 | __le32 hnd; | |
141 | __le32 id; /* upper 3 bits contain flags */ | |
142 | u8 data[8]; | |
143 | }; | |
144 | ||
145 | struct tx_done_msg { | |
146 | u8 len; | |
147 | u8 cmd; | |
148 | u8 net; | |
149 | u8 status; | |
150 | __le32 hnd; | |
151 | __le32 ts; | |
152 | }; | |
153 | ||
154 | struct id_filter_msg { | |
155 | u8 len; | |
156 | u8 cmd; | |
157 | u8 net; | |
158 | u8 option; | |
159 | __le32 mask[ESD_MAX_ID_SEGMENT + 1]; | |
160 | }; | |
161 | ||
162 | struct set_baudrate_msg { | |
163 | u8 len; | |
164 | u8 cmd; | |
165 | u8 net; | |
166 | u8 rsvd; | |
167 | __le32 baud; | |
168 | }; | |
169 | ||
170 | /* Main message type used between library and application */ | |
171 | struct __attribute__ ((packed)) esd_usb2_msg { | |
172 | union { | |
173 | struct header_msg hdr; | |
174 | struct version_msg version; | |
175 | struct version_reply_msg version_reply; | |
176 | struct rx_msg rx; | |
177 | struct tx_msg tx; | |
178 | struct tx_done_msg txdone; | |
179 | struct set_baudrate_msg setbaud; | |
180 | struct id_filter_msg filter; | |
181 | } msg; | |
182 | }; | |
183 | ||
184 | static struct usb_device_id esd_usb2_table[] = { | |
185 | {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, | |
186 | {} | |
187 | }; | |
188 | MODULE_DEVICE_TABLE(usb, esd_usb2_table); | |
189 | ||
190 | struct esd_usb2_net_priv; | |
191 | ||
192 | struct esd_tx_urb_context { | |
193 | struct esd_usb2_net_priv *priv; | |
194 | u32 echo_index; | |
195 | int dlc; | |
196 | }; | |
197 | ||
198 | struct esd_usb2 { | |
199 | struct usb_device *udev; | |
200 | struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS]; | |
201 | ||
202 | struct usb_anchor rx_submitted; | |
203 | ||
204 | int net_count; | |
205 | u32 version; | |
206 | int rxinitdone; | |
207 | }; | |
208 | ||
209 | struct esd_usb2_net_priv { | |
210 | struct can_priv can; /* must be the first member */ | |
211 | ||
212 | atomic_t active_tx_jobs; | |
213 | struct usb_anchor tx_submitted; | |
214 | struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; | |
215 | ||
216 | int open_time; | |
217 | struct esd_usb2 *usb2; | |
218 | struct net_device *netdev; | |
219 | int index; | |
220 | u8 old_state; | |
221 | struct can_berr_counter bec; | |
222 | }; | |
223 | ||
224 | static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, | |
225 | struct esd_usb2_msg *msg) | |
226 | { | |
227 | struct net_device_stats *stats = &priv->netdev->stats; | |
228 | struct can_frame *cf; | |
229 | struct sk_buff *skb; | |
230 | u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; | |
231 | ||
232 | if (id == ESD_EV_CAN_ERROR_EXT) { | |
233 | u8 state = msg->msg.rx.data[0]; | |
234 | u8 ecc = msg->msg.rx.data[1]; | |
235 | u8 txerr = msg->msg.rx.data[2]; | |
236 | u8 rxerr = msg->msg.rx.data[3]; | |
237 | ||
238 | skb = alloc_can_err_skb(priv->netdev, &cf); | |
239 | if (skb == NULL) { | |
240 | stats->rx_dropped++; | |
241 | return; | |
242 | } | |
243 | ||
244 | if (state != priv->old_state) { | |
245 | priv->old_state = state; | |
246 | ||
247 | switch (state & ESD_BUSSTATE_MASK) { | |
248 | case ESD_BUSSTATE_BUSOFF: | |
249 | priv->can.state = CAN_STATE_BUS_OFF; | |
250 | cf->can_id |= CAN_ERR_BUSOFF; | |
251 | can_bus_off(priv->netdev); | |
252 | break; | |
253 | case ESD_BUSSTATE_WARN: | |
254 | priv->can.state = CAN_STATE_ERROR_WARNING; | |
255 | priv->can.can_stats.error_warning++; | |
256 | break; | |
257 | case ESD_BUSSTATE_ERRPASSIVE: | |
258 | priv->can.state = CAN_STATE_ERROR_PASSIVE; | |
259 | priv->can.can_stats.error_passive++; | |
260 | break; | |
261 | default: | |
262 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
263 | break; | |
264 | } | |
265 | } else { | |
266 | priv->can.can_stats.bus_error++; | |
267 | stats->rx_errors++; | |
268 | ||
269 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; | |
270 | ||
271 | switch (ecc & SJA1000_ECC_MASK) { | |
272 | case SJA1000_ECC_BIT: | |
273 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
274 | break; | |
275 | case SJA1000_ECC_FORM: | |
276 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
277 | break; | |
278 | case SJA1000_ECC_STUFF: | |
279 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
280 | break; | |
281 | default: | |
282 | cf->data[2] |= CAN_ERR_PROT_UNSPEC; | |
283 | cf->data[3] = ecc & SJA1000_ECC_SEG; | |
284 | break; | |
285 | } | |
286 | ||
25985edc | 287 | /* Error occurred during transmission? */ |
96d8e903 MF |
288 | if (!(ecc & SJA1000_ECC_DIR)) |
289 | cf->data[2] |= CAN_ERR_PROT_TX; | |
290 | ||
291 | if (priv->can.state == CAN_STATE_ERROR_WARNING || | |
292 | priv->can.state == CAN_STATE_ERROR_PASSIVE) { | |
293 | cf->data[1] = (txerr > rxerr) ? | |
294 | CAN_ERR_CRTL_TX_PASSIVE : | |
295 | CAN_ERR_CRTL_RX_PASSIVE; | |
296 | } | |
297 | cf->data[6] = txerr; | |
298 | cf->data[7] = rxerr; | |
299 | } | |
300 | ||
301 | netif_rx(skb); | |
302 | ||
303 | priv->bec.txerr = txerr; | |
304 | priv->bec.rxerr = rxerr; | |
305 | ||
306 | stats->rx_packets++; | |
307 | stats->rx_bytes += cf->can_dlc; | |
308 | } | |
309 | } | |
310 | ||
311 | static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, | |
312 | struct esd_usb2_msg *msg) | |
313 | { | |
314 | struct net_device_stats *stats = &priv->netdev->stats; | |
315 | struct can_frame *cf; | |
316 | struct sk_buff *skb; | |
317 | int i; | |
318 | u32 id; | |
319 | ||
320 | if (!netif_device_present(priv->netdev)) | |
321 | return; | |
322 | ||
323 | id = le32_to_cpu(msg->msg.rx.id); | |
324 | ||
325 | if (id & ESD_EVENT) { | |
326 | esd_usb2_rx_event(priv, msg); | |
327 | } else { | |
328 | skb = alloc_can_skb(priv->netdev, &cf); | |
329 | if (skb == NULL) { | |
330 | stats->rx_dropped++; | |
331 | return; | |
332 | } | |
333 | ||
334 | cf->can_id = id & ESD_IDMASK; | |
335 | cf->can_dlc = get_can_dlc(msg->msg.rx.dlc); | |
336 | ||
337 | if (id & ESD_EXTID) | |
338 | cf->can_id |= CAN_EFF_FLAG; | |
339 | ||
340 | if (msg->msg.rx.dlc & ESD_RTR) { | |
341 | cf->can_id |= CAN_RTR_FLAG; | |
342 | } else { | |
343 | for (i = 0; i < cf->can_dlc; i++) | |
344 | cf->data[i] = msg->msg.rx.data[i]; | |
345 | } | |
346 | ||
347 | netif_rx(skb); | |
348 | ||
349 | stats->rx_packets++; | |
350 | stats->rx_bytes += cf->can_dlc; | |
351 | } | |
352 | ||
353 | return; | |
354 | } | |
355 | ||
356 | static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, | |
357 | struct esd_usb2_msg *msg) | |
358 | { | |
359 | struct net_device_stats *stats = &priv->netdev->stats; | |
360 | struct net_device *netdev = priv->netdev; | |
361 | struct esd_tx_urb_context *context; | |
362 | ||
363 | if (!netif_device_present(netdev)) | |
364 | return; | |
365 | ||
366 | context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; | |
367 | ||
368 | if (!msg->msg.txdone.status) { | |
369 | stats->tx_packets++; | |
370 | stats->tx_bytes += context->dlc; | |
371 | can_get_echo_skb(netdev, context->echo_index); | |
372 | } else { | |
373 | stats->tx_errors++; | |
374 | can_free_echo_skb(netdev, context->echo_index); | |
375 | } | |
376 | ||
377 | /* Release context */ | |
378 | context->echo_index = MAX_TX_URBS; | |
379 | atomic_dec(&priv->active_tx_jobs); | |
380 | ||
381 | netif_wake_queue(netdev); | |
382 | } | |
383 | ||
384 | static void esd_usb2_read_bulk_callback(struct urb *urb) | |
385 | { | |
386 | struct esd_usb2 *dev = urb->context; | |
387 | int retval; | |
388 | int pos = 0; | |
389 | int i; | |
390 | ||
391 | switch (urb->status) { | |
392 | case 0: /* success */ | |
393 | break; | |
394 | ||
395 | case -ENOENT: | |
396 | case -ESHUTDOWN: | |
397 | return; | |
398 | ||
399 | default: | |
400 | dev_info(dev->udev->dev.parent, | |
401 | "Rx URB aborted (%d)\n", urb->status); | |
402 | goto resubmit_urb; | |
403 | } | |
404 | ||
405 | while (pos < urb->actual_length) { | |
406 | struct esd_usb2_msg *msg; | |
407 | ||
408 | msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); | |
409 | ||
410 | switch (msg->msg.hdr.cmd) { | |
411 | case CMD_CAN_RX: | |
412 | esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); | |
413 | break; | |
414 | ||
415 | case CMD_CAN_TX: | |
416 | esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], | |
417 | msg); | |
418 | break; | |
419 | } | |
420 | ||
421 | pos += msg->msg.hdr.len << 2; | |
422 | ||
423 | if (pos > urb->actual_length) { | |
424 | dev_err(dev->udev->dev.parent, "format error\n"); | |
425 | break; | |
426 | } | |
427 | } | |
428 | ||
429 | resubmit_urb: | |
430 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), | |
431 | urb->transfer_buffer, RX_BUFFER_SIZE, | |
432 | esd_usb2_read_bulk_callback, dev); | |
433 | ||
434 | retval = usb_submit_urb(urb, GFP_ATOMIC); | |
435 | if (retval == -ENODEV) { | |
436 | for (i = 0; i < dev->net_count; i++) { | |
437 | if (dev->nets[i]) | |
438 | netif_device_detach(dev->nets[i]->netdev); | |
439 | } | |
440 | } else if (retval) { | |
441 | dev_err(dev->udev->dev.parent, | |
442 | "failed resubmitting read bulk urb: %d\n", retval); | |
443 | } | |
444 | ||
445 | return; | |
446 | } | |
447 | ||
448 | /* | |
449 | * callback for bulk IN urb | |
450 | */ | |
451 | static void esd_usb2_write_bulk_callback(struct urb *urb) | |
452 | { | |
453 | struct esd_tx_urb_context *context = urb->context; | |
454 | struct esd_usb2_net_priv *priv; | |
455 | struct esd_usb2 *dev; | |
456 | struct net_device *netdev; | |
457 | size_t size = sizeof(struct esd_usb2_msg); | |
458 | ||
459 | WARN_ON(!context); | |
460 | ||
461 | priv = context->priv; | |
462 | netdev = priv->netdev; | |
463 | dev = priv->usb2; | |
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 | dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n", | |
474 | urb->status); | |
475 | ||
476 | netdev->trans_start = jiffies; | |
477 | } | |
478 | ||
479 | static ssize_t show_firmware(struct device *d, | |
480 | struct device_attribute *attr, char *buf) | |
481 | { | |
482 | struct usb_interface *intf = to_usb_interface(d); | |
483 | struct esd_usb2 *dev = usb_get_intfdata(intf); | |
484 | ||
485 | return sprintf(buf, "%d.%d.%d\n", | |
486 | (dev->version >> 12) & 0xf, | |
487 | (dev->version >> 8) & 0xf, | |
488 | dev->version & 0xff); | |
489 | } | |
490 | static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL); | |
491 | ||
492 | static ssize_t show_hardware(struct device *d, | |
493 | struct device_attribute *attr, char *buf) | |
494 | { | |
495 | struct usb_interface *intf = to_usb_interface(d); | |
496 | struct esd_usb2 *dev = usb_get_intfdata(intf); | |
497 | ||
498 | return sprintf(buf, "%d.%d.%d\n", | |
499 | (dev->version >> 28) & 0xf, | |
500 | (dev->version >> 24) & 0xf, | |
501 | (dev->version >> 16) & 0xff); | |
502 | } | |
503 | static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL); | |
504 | ||
505 | static ssize_t show_nets(struct device *d, | |
506 | struct device_attribute *attr, char *buf) | |
507 | { | |
508 | struct usb_interface *intf = to_usb_interface(d); | |
509 | struct esd_usb2 *dev = usb_get_intfdata(intf); | |
510 | ||
511 | return sprintf(buf, "%d", dev->net_count); | |
512 | } | |
513 | static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL); | |
514 | ||
515 | static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) | |
516 | { | |
517 | int actual_length; | |
518 | ||
519 | return usb_bulk_msg(dev->udev, | |
520 | usb_sndbulkpipe(dev->udev, 2), | |
521 | msg, | |
522 | msg->msg.hdr.len << 2, | |
523 | &actual_length, | |
524 | 1000); | |
525 | } | |
526 | ||
527 | static int esd_usb2_wait_msg(struct esd_usb2 *dev, | |
528 | struct esd_usb2_msg *msg) | |
529 | { | |
530 | int actual_length; | |
531 | ||
532 | return usb_bulk_msg(dev->udev, | |
533 | usb_rcvbulkpipe(dev->udev, 1), | |
534 | msg, | |
535 | sizeof(*msg), | |
536 | &actual_length, | |
537 | 1000); | |
538 | } | |
539 | ||
540 | static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev) | |
541 | { | |
542 | int i, err = 0; | |
543 | ||
544 | if (dev->rxinitdone) | |
545 | return 0; | |
546 | ||
547 | for (i = 0; i < MAX_RX_URBS; i++) { | |
548 | struct urb *urb = NULL; | |
549 | u8 *buf = NULL; | |
550 | ||
551 | /* create a URB, and a buffer for it */ | |
552 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
553 | if (!urb) { | |
554 | dev_warn(dev->udev->dev.parent, | |
555 | "No memory left for URBs\n"); | |
556 | err = -ENOMEM; | |
557 | break; | |
558 | } | |
559 | ||
560 | buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, | |
561 | &urb->transfer_dma); | |
562 | if (!buf) { | |
563 | dev_warn(dev->udev->dev.parent, | |
564 | "No memory left for USB buffer\n"); | |
565 | err = -ENOMEM; | |
566 | goto freeurb; | |
567 | } | |
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 | } | |
582 | ||
583 | freeurb: | |
584 | /* Drop reference, USB core will take care of freeing it */ | |
585 | usb_free_urb(urb); | |
586 | if (err) | |
587 | break; | |
588 | } | |
589 | ||
590 | /* Did we submit any URBs */ | |
591 | if (i == 0) { | |
592 | dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); | |
593 | return err; | |
594 | } | |
595 | ||
596 | /* Warn if we've couldn't transmit all the URBs */ | |
597 | if (i < MAX_RX_URBS) { | |
598 | dev_warn(dev->udev->dev.parent, | |
599 | "rx performance may be slow\n"); | |
600 | } | |
601 | ||
602 | dev->rxinitdone = 1; | |
603 | return 0; | |
604 | } | |
605 | ||
606 | /* | |
607 | * Start interface | |
608 | */ | |
609 | static int esd_usb2_start(struct esd_usb2_net_priv *priv) | |
610 | { | |
611 | struct esd_usb2 *dev = priv->usb2; | |
612 | struct net_device *netdev = priv->netdev; | |
613 | struct esd_usb2_msg msg; | |
614 | int err, i; | |
615 | ||
616 | /* | |
617 | * Enable all IDs | |
618 | * The IDADD message takes up to 64 32 bit bitmasks (2048 bits). | |
619 | * Each bit represents one 11 bit CAN identifier. A set bit | |
620 | * enables reception of the corresponding CAN identifier. A cleared | |
621 | * bit disabled this identifier. An additional bitmask value | |
622 | * following the CAN 2.0A bits is used to enable reception of | |
623 | * extended CAN frames. Only the LSB of this final mask is checked | |
624 | * for the complete 29 bit ID range. The IDADD message also allows | |
625 | * filter configuration for an ID subset. In this case you can add | |
626 | * the number of the starting bitmask (0..64) to the filter.option | |
627 | * field followed by only some bitmasks. | |
628 | */ | |
629 | msg.msg.hdr.cmd = CMD_IDADD; | |
630 | msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; | |
631 | msg.msg.filter.net = priv->index; | |
632 | msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ | |
633 | for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) | |
634 | msg.msg.filter.mask[i] = cpu_to_le32(0xffffffff); | |
635 | /* enable 29bit extended IDs */ | |
636 | msg.msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); | |
637 | ||
638 | err = esd_usb2_send_msg(dev, &msg); | |
639 | if (err) | |
640 | goto failed; | |
641 | ||
642 | err = esd_usb2_setup_rx_urbs(dev); | |
643 | if (err) | |
644 | goto failed; | |
645 | ||
646 | priv->can.state = CAN_STATE_ERROR_ACTIVE; | |
647 | ||
648 | return 0; | |
649 | ||
650 | failed: | |
651 | if (err == -ENODEV) | |
652 | netif_device_detach(netdev); | |
653 | ||
654 | dev_err(netdev->dev.parent, "couldn't start device: %d\n", err); | |
655 | ||
656 | return err; | |
657 | } | |
658 | ||
659 | static void unlink_all_urbs(struct esd_usb2 *dev) | |
660 | { | |
661 | struct esd_usb2_net_priv *priv; | |
0b322111 | 662 | int i, j; |
96d8e903 MF |
663 | |
664 | usb_kill_anchored_urbs(&dev->rx_submitted); | |
665 | for (i = 0; i < dev->net_count; i++) { | |
666 | priv = dev->nets[i]; | |
667 | if (priv) { | |
668 | usb_kill_anchored_urbs(&priv->tx_submitted); | |
669 | atomic_set(&priv->active_tx_jobs, 0); | |
670 | ||
0b322111 | 671 | for (j = 0; j < MAX_TX_URBS; j++) |
672 | priv->tx_contexts[j].echo_index = MAX_TX_URBS; | |
96d8e903 MF |
673 | } |
674 | } | |
675 | } | |
676 | ||
677 | static int esd_usb2_open(struct net_device *netdev) | |
678 | { | |
679 | struct esd_usb2_net_priv *priv = netdev_priv(netdev); | |
680 | int err; | |
681 | ||
682 | /* common open */ | |
683 | err = open_candev(netdev); | |
684 | if (err) | |
685 | return err; | |
686 | ||
687 | /* finally start device */ | |
688 | err = esd_usb2_start(priv); | |
689 | if (err) { | |
690 | dev_warn(netdev->dev.parent, | |
691 | "couldn't start device: %d\n", err); | |
692 | close_candev(netdev); | |
693 | return err; | |
694 | } | |
695 | ||
696 | priv->open_time = jiffies; | |
697 | ||
698 | netif_start_queue(netdev); | |
699 | ||
700 | return 0; | |
701 | } | |
702 | ||
703 | static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, | |
704 | struct net_device *netdev) | |
705 | { | |
706 | struct esd_usb2_net_priv *priv = netdev_priv(netdev); | |
707 | struct esd_usb2 *dev = priv->usb2; | |
708 | struct esd_tx_urb_context *context = NULL; | |
709 | struct net_device_stats *stats = &netdev->stats; | |
710 | struct can_frame *cf = (struct can_frame *)skb->data; | |
711 | struct esd_usb2_msg *msg; | |
712 | struct urb *urb; | |
713 | u8 *buf; | |
714 | int i, err; | |
715 | int ret = NETDEV_TX_OK; | |
716 | size_t size = sizeof(struct esd_usb2_msg); | |
717 | ||
718 | if (can_dropped_invalid_skb(netdev, skb)) | |
719 | return NETDEV_TX_OK; | |
720 | ||
721 | /* create a URB, and a buffer for it, and copy the data to the URB */ | |
722 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
723 | if (!urb) { | |
724 | dev_err(netdev->dev.parent, "No memory left for URBs\n"); | |
725 | stats->tx_dropped++; | |
726 | dev_kfree_skb(skb); | |
727 | goto nourbmem; | |
728 | } | |
729 | ||
730 | buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, | |
731 | &urb->transfer_dma); | |
732 | if (!buf) { | |
733 | dev_err(netdev->dev.parent, "No memory left for USB buffer\n"); | |
734 | stats->tx_dropped++; | |
735 | dev_kfree_skb(skb); | |
736 | goto nobufmem; | |
737 | } | |
738 | ||
739 | msg = (struct esd_usb2_msg *)buf; | |
740 | ||
741 | msg->msg.hdr.len = 3; /* minimal length */ | |
742 | msg->msg.hdr.cmd = CMD_CAN_TX; | |
743 | msg->msg.tx.net = priv->index; | |
744 | msg->msg.tx.dlc = cf->can_dlc; | |
745 | msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); | |
746 | ||
747 | if (cf->can_id & CAN_RTR_FLAG) | |
748 | msg->msg.tx.dlc |= ESD_RTR; | |
749 | ||
750 | if (cf->can_id & CAN_EFF_FLAG) | |
751 | msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); | |
752 | ||
753 | for (i = 0; i < cf->can_dlc; i++) | |
754 | msg->msg.tx.data[i] = cf->data[i]; | |
755 | ||
756 | msg->msg.hdr.len += (cf->can_dlc + 3) >> 2; | |
757 | ||
758 | for (i = 0; i < MAX_TX_URBS; i++) { | |
759 | if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { | |
760 | context = &priv->tx_contexts[i]; | |
761 | break; | |
762 | } | |
763 | } | |
764 | ||
765 | /* | |
766 | * This may never happen. | |
767 | */ | |
768 | if (!context) { | |
769 | dev_warn(netdev->dev.parent, "couldn't find free context\n"); | |
770 | ret = NETDEV_TX_BUSY; | |
771 | goto releasebuf; | |
772 | } | |
773 | ||
774 | context->priv = priv; | |
775 | context->echo_index = i; | |
776 | context->dlc = cf->can_dlc; | |
777 | ||
778 | /* hnd must not be 0 - MSB is stripped in txdone handling */ | |
779 | msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ | |
780 | ||
781 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, | |
782 | msg->msg.hdr.len << 2, | |
783 | esd_usb2_write_bulk_callback, context); | |
784 | ||
785 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
786 | ||
787 | usb_anchor_urb(urb, &priv->tx_submitted); | |
788 | ||
789 | can_put_echo_skb(skb, netdev, context->echo_index); | |
790 | ||
791 | atomic_inc(&priv->active_tx_jobs); | |
792 | ||
793 | /* Slow down tx path */ | |
794 | if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) | |
795 | netif_stop_queue(netdev); | |
796 | ||
797 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
798 | if (err) { | |
799 | can_free_echo_skb(netdev, context->echo_index); | |
800 | ||
801 | atomic_dec(&priv->active_tx_jobs); | |
802 | usb_unanchor_urb(urb); | |
803 | ||
804 | stats->tx_dropped++; | |
805 | ||
806 | if (err == -ENODEV) | |
807 | netif_device_detach(netdev); | |
808 | else | |
809 | dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err); | |
810 | ||
811 | goto releasebuf; | |
812 | } | |
813 | ||
814 | netdev->trans_start = jiffies; | |
815 | ||
816 | /* | |
817 | * Release our reference to this URB, the USB core will eventually free | |
818 | * it entirely. | |
819 | */ | |
820 | usb_free_urb(urb); | |
821 | ||
822 | return NETDEV_TX_OK; | |
823 | ||
824 | releasebuf: | |
825 | usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); | |
826 | ||
827 | nobufmem: | |
828 | usb_free_urb(urb); | |
829 | ||
830 | nourbmem: | |
831 | return ret; | |
832 | } | |
833 | ||
834 | static int esd_usb2_close(struct net_device *netdev) | |
835 | { | |
836 | struct esd_usb2_net_priv *priv = netdev_priv(netdev); | |
837 | struct esd_usb2_msg msg; | |
838 | int i; | |
839 | ||
840 | /* Disable all IDs (see esd_usb2_start()) */ | |
841 | msg.msg.hdr.cmd = CMD_IDADD; | |
842 | msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; | |
843 | msg.msg.filter.net = priv->index; | |
844 | msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ | |
845 | for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) | |
846 | msg.msg.filter.mask[i] = 0; | |
847 | if (esd_usb2_send_msg(priv->usb2, &msg) < 0) | |
848 | dev_err(netdev->dev.parent, "sending idadd message failed\n"); | |
849 | ||
850 | /* set CAN controller to reset mode */ | |
851 | msg.msg.hdr.len = 2; | |
852 | msg.msg.hdr.cmd = CMD_SETBAUD; | |
853 | msg.msg.setbaud.net = priv->index; | |
854 | msg.msg.setbaud.rsvd = 0; | |
855 | msg.msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); | |
856 | if (esd_usb2_send_msg(priv->usb2, &msg) < 0) | |
857 | dev_err(netdev->dev.parent, "sending setbaud message failed\n"); | |
858 | ||
859 | priv->can.state = CAN_STATE_STOPPED; | |
860 | ||
861 | netif_stop_queue(netdev); | |
862 | ||
863 | close_candev(netdev); | |
864 | ||
865 | priv->open_time = 0; | |
866 | ||
867 | return 0; | |
868 | } | |
869 | ||
870 | static const struct net_device_ops esd_usb2_netdev_ops = { | |
871 | .ndo_open = esd_usb2_open, | |
872 | .ndo_stop = esd_usb2_close, | |
873 | .ndo_start_xmit = esd_usb2_start_xmit, | |
874 | }; | |
875 | ||
876 | static struct can_bittiming_const esd_usb2_bittiming_const = { | |
877 | .name = "esd_usb2", | |
878 | .tseg1_min = ESD_USB2_TSEG1_MIN, | |
879 | .tseg1_max = ESD_USB2_TSEG1_MAX, | |
880 | .tseg2_min = ESD_USB2_TSEG2_MIN, | |
881 | .tseg2_max = ESD_USB2_TSEG2_MAX, | |
882 | .sjw_max = ESD_USB2_SJW_MAX, | |
883 | .brp_min = ESD_USB2_BRP_MIN, | |
884 | .brp_max = ESD_USB2_BRP_MAX, | |
885 | .brp_inc = ESD_USB2_BRP_INC, | |
886 | }; | |
887 | ||
888 | static int esd_usb2_set_bittiming(struct net_device *netdev) | |
889 | { | |
890 | struct esd_usb2_net_priv *priv = netdev_priv(netdev); | |
891 | struct can_bittiming *bt = &priv->can.bittiming; | |
892 | struct esd_usb2_msg msg; | |
893 | u32 canbtr; | |
894 | ||
895 | canbtr = ESD_USB2_UBR; | |
896 | canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); | |
897 | canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) | |
898 | << ESD_USB2_SJW_SHIFT; | |
899 | canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) | |
900 | & (ESD_USB2_TSEG1_MAX - 1)) | |
901 | << ESD_USB2_TSEG1_SHIFT; | |
902 | canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) | |
903 | << ESD_USB2_TSEG2_SHIFT; | |
904 | if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) | |
905 | canbtr |= ESD_USB2_3_SAMPLES; | |
906 | ||
907 | msg.msg.hdr.len = 2; | |
908 | msg.msg.hdr.cmd = CMD_SETBAUD; | |
909 | msg.msg.setbaud.net = priv->index; | |
910 | msg.msg.setbaud.rsvd = 0; | |
911 | msg.msg.setbaud.baud = cpu_to_le32(canbtr); | |
912 | ||
913 | dev_info(netdev->dev.parent, "setting BTR=%#x\n", canbtr); | |
914 | ||
915 | return esd_usb2_send_msg(priv->usb2, &msg); | |
916 | } | |
917 | ||
918 | static int esd_usb2_get_berr_counter(const struct net_device *netdev, | |
919 | struct can_berr_counter *bec) | |
920 | { | |
921 | struct esd_usb2_net_priv *priv = netdev_priv(netdev); | |
922 | ||
923 | bec->txerr = priv->bec.txerr; | |
924 | bec->rxerr = priv->bec.rxerr; | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
929 | static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) | |
930 | { | |
931 | struct esd_usb2_net_priv *priv = netdev_priv(netdev); | |
932 | ||
933 | if (!priv->open_time) | |
934 | return -EINVAL; | |
935 | ||
936 | switch (mode) { | |
937 | case CAN_MODE_START: | |
938 | netif_wake_queue(netdev); | |
939 | break; | |
940 | ||
941 | default: | |
942 | return -EOPNOTSUPP; | |
943 | } | |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
948 | static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) | |
949 | { | |
950 | struct esd_usb2 *dev = usb_get_intfdata(intf); | |
951 | struct net_device *netdev; | |
952 | struct esd_usb2_net_priv *priv; | |
953 | int err = 0; | |
954 | int i; | |
955 | ||
956 | netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); | |
957 | if (!netdev) { | |
958 | dev_err(&intf->dev, "couldn't alloc candev\n"); | |
959 | err = -ENOMEM; | |
960 | goto done; | |
961 | } | |
962 | ||
963 | priv = netdev_priv(netdev); | |
964 | ||
965 | init_usb_anchor(&priv->tx_submitted); | |
966 | atomic_set(&priv->active_tx_jobs, 0); | |
967 | ||
968 | for (i = 0; i < MAX_TX_URBS; i++) | |
969 | priv->tx_contexts[i].echo_index = MAX_TX_URBS; | |
970 | ||
971 | priv->usb2 = dev; | |
972 | priv->netdev = netdev; | |
973 | priv->index = index; | |
974 | ||
975 | priv->can.state = CAN_STATE_STOPPED; | |
976 | priv->can.clock.freq = ESD_USB2_CAN_CLOCK; | |
977 | priv->can.bittiming_const = &esd_usb2_bittiming_const; | |
978 | priv->can.do_set_bittiming = esd_usb2_set_bittiming; | |
979 | priv->can.do_set_mode = esd_usb2_set_mode; | |
980 | priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; | |
981 | priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; | |
982 | ||
983 | netdev->flags |= IFF_ECHO; /* we support local echo */ | |
984 | ||
985 | netdev->netdev_ops = &esd_usb2_netdev_ops; | |
986 | ||
987 | SET_NETDEV_DEV(netdev, &intf->dev); | |
988 | ||
989 | err = register_candev(netdev); | |
990 | if (err) { | |
991 | dev_err(&intf->dev, | |
992 | "couldn't register CAN device: %d\n", err); | |
993 | free_candev(netdev); | |
994 | err = -ENOMEM; | |
995 | goto done; | |
996 | } | |
997 | ||
998 | dev->nets[index] = priv; | |
999 | dev_info(netdev->dev.parent, "device %s registered\n", netdev->name); | |
1000 | ||
1001 | done: | |
1002 | return err; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * probe function for new USB2 devices | |
1007 | * | |
1008 | * check version information and number of available | |
1009 | * CAN interfaces | |
1010 | */ | |
1011 | static int esd_usb2_probe(struct usb_interface *intf, | |
1012 | const struct usb_device_id *id) | |
1013 | { | |
1014 | struct esd_usb2 *dev; | |
1015 | struct esd_usb2_msg msg; | |
1016 | int i, err; | |
1017 | ||
1018 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1019 | if (!dev) { | |
1020 | err = -ENOMEM; | |
1021 | goto done; | |
1022 | } | |
1023 | ||
1024 | dev->udev = interface_to_usbdev(intf); | |
1025 | ||
1026 | init_usb_anchor(&dev->rx_submitted); | |
1027 | ||
1028 | usb_set_intfdata(intf, dev); | |
1029 | ||
1030 | /* query number of CAN interfaces (nets) */ | |
1031 | msg.msg.hdr.cmd = CMD_VERSION; | |
1032 | msg.msg.hdr.len = 2; | |
1033 | msg.msg.version.rsvd = 0; | |
1034 | msg.msg.version.flags = 0; | |
1035 | msg.msg.version.drv_version = 0; | |
1036 | ||
1037 | err = esd_usb2_send_msg(dev, &msg); | |
1038 | if (err < 0) { | |
1039 | dev_err(&intf->dev, "sending version message failed\n"); | |
1040 | goto free_dev; | |
1041 | } | |
1042 | ||
1043 | err = esd_usb2_wait_msg(dev, &msg); | |
1044 | if (err < 0) { | |
1045 | dev_err(&intf->dev, "no version message answer\n"); | |
1046 | goto free_dev; | |
1047 | } | |
1048 | ||
1049 | dev->net_count = (int)msg.msg.version_reply.nets; | |
1050 | dev->version = le32_to_cpu(msg.msg.version_reply.version); | |
1051 | ||
1052 | if (device_create_file(&intf->dev, &dev_attr_firmware)) | |
1053 | dev_err(&intf->dev, | |
1054 | "Couldn't create device file for firmware\n"); | |
1055 | ||
1056 | if (device_create_file(&intf->dev, &dev_attr_hardware)) | |
1057 | dev_err(&intf->dev, | |
1058 | "Couldn't create device file for hardware\n"); | |
1059 | ||
1060 | if (device_create_file(&intf->dev, &dev_attr_nets)) | |
1061 | dev_err(&intf->dev, | |
1062 | "Couldn't create device file for nets\n"); | |
1063 | ||
1064 | /* do per device probing */ | |
1065 | for (i = 0; i < dev->net_count; i++) | |
1066 | esd_usb2_probe_one_net(intf, i); | |
1067 | ||
1068 | return 0; | |
1069 | ||
1070 | free_dev: | |
1071 | kfree(dev); | |
1072 | done: | |
1073 | return err; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * called by the usb core when the device is removed from the system | |
1078 | */ | |
1079 | static void esd_usb2_disconnect(struct usb_interface *intf) | |
1080 | { | |
1081 | struct esd_usb2 *dev = usb_get_intfdata(intf); | |
1082 | struct net_device *netdev; | |
1083 | int i; | |
1084 | ||
1085 | device_remove_file(&intf->dev, &dev_attr_firmware); | |
1086 | device_remove_file(&intf->dev, &dev_attr_hardware); | |
1087 | device_remove_file(&intf->dev, &dev_attr_nets); | |
1088 | ||
1089 | usb_set_intfdata(intf, NULL); | |
1090 | ||
1091 | if (dev) { | |
1092 | for (i = 0; i < dev->net_count; i++) { | |
1093 | if (dev->nets[i]) { | |
1094 | netdev = dev->nets[i]->netdev; | |
1095 | unregister_netdev(netdev); | |
1096 | free_candev(netdev); | |
1097 | } | |
1098 | } | |
1099 | unlink_all_urbs(dev); | |
1100 | } | |
1101 | } | |
1102 | ||
1103 | /* usb specific object needed to register this driver with the usb subsystem */ | |
1104 | static struct usb_driver esd_usb2_driver = { | |
1105 | .name = "esd_usb2", | |
1106 | .probe = esd_usb2_probe, | |
1107 | .disconnect = esd_usb2_disconnect, | |
1108 | .id_table = esd_usb2_table, | |
1109 | }; | |
1110 | ||
1111 | static int __init esd_usb2_init(void) | |
1112 | { | |
1113 | int err; | |
1114 | ||
1115 | /* register this driver with the USB subsystem */ | |
1116 | err = usb_register(&esd_usb2_driver); | |
1117 | ||
1118 | if (err) { | |
1119 | err("usb_register failed. Error number %d\n", err); | |
1120 | return err; | |
1121 | } | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | module_init(esd_usb2_init); | |
1126 | ||
1127 | static void __exit esd_usb2_exit(void) | |
1128 | { | |
1129 | /* deregister this driver with the USB subsystem */ | |
1130 | usb_deregister(&esd_usb2_driver); | |
1131 | } | |
1132 | module_exit(esd_usb2_exit); |