Commit | Line | Data |
---|---|---|
702171ad SH |
1 | /* |
2 | * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7 | |
3 | * | |
4 | * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche | |
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 | */ | |
702171ad SH |
19 | #include <linux/signal.h> |
20 | #include <linux/slab.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/usb.h> | |
24 | ||
25 | #include <linux/can.h> | |
26 | #include <linux/can/dev.h> | |
27 | #include <linux/can/error.h> | |
28 | ||
29 | MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>"); | |
30 | MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces"); | |
31 | MODULE_LICENSE("GPL v2"); | |
32 | ||
33 | /* Control-Values for CPC_Control() Command Subject Selection */ | |
34 | #define CONTR_CAN_MESSAGE 0x04 | |
35 | #define CONTR_CAN_STATE 0x0C | |
36 | #define CONTR_BUS_ERROR 0x1C | |
37 | ||
38 | /* Control Command Actions */ | |
39 | #define CONTR_CONT_OFF 0 | |
40 | #define CONTR_CONT_ON 1 | |
41 | #define CONTR_ONCE 2 | |
42 | ||
43 | /* Messages from CPC to PC */ | |
44 | #define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */ | |
45 | #define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */ | |
46 | #define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */ | |
47 | #define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */ | |
48 | #define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */ | |
49 | #define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */ | |
50 | #define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */ | |
51 | #define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */ | |
52 | #define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */ | |
53 | #define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */ | |
54 | #define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */ | |
55 | ||
56 | /* Messages from the PC to the CPC interface */ | |
57 | #define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */ | |
58 | #define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */ | |
59 | #define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */ | |
60 | #define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */ | |
61 | #define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */ | |
62 | #define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */ | |
63 | #define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */ | |
64 | #define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */ | |
65 | ||
66 | #define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */ | |
67 | #define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */ | |
68 | #define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */ | |
69 | ||
70 | #define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */ | |
71 | ||
72 | #define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */ | |
73 | ||
74 | /* Overrun types */ | |
75 | #define CPC_OVR_EVENT_CAN 0x01 | |
76 | #define CPC_OVR_EVENT_CANSTATE 0x02 | |
77 | #define CPC_OVR_EVENT_BUSERROR 0x04 | |
78 | ||
79 | /* | |
80 | * If the CAN controller lost a message we indicate it with the highest bit | |
81 | * set in the count field. | |
82 | */ | |
83 | #define CPC_OVR_HW 0x80 | |
84 | ||
85 | /* Size of the "struct ems_cpc_msg" without the union */ | |
86 | #define CPC_MSG_HEADER_LEN 11 | |
87 | #define CPC_CAN_MSG_MIN_SIZE 5 | |
88 | ||
89 | /* Define these values to match your devices */ | |
90 | #define USB_CPCUSB_VENDOR_ID 0x12D6 | |
91 | ||
92 | #define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444 | |
93 | ||
94 | /* Mode register NXP LPC2119/SJA1000 CAN Controller */ | |
95 | #define SJA1000_MOD_NORMAL 0x00 | |
96 | #define SJA1000_MOD_RM 0x01 | |
97 | ||
98 | /* ECC register NXP LPC2119/SJA1000 CAN Controller */ | |
99 | #define SJA1000_ECC_SEG 0x1F | |
100 | #define SJA1000_ECC_DIR 0x20 | |
101 | #define SJA1000_ECC_ERR 0x06 | |
102 | #define SJA1000_ECC_BIT 0x00 | |
103 | #define SJA1000_ECC_FORM 0x40 | |
104 | #define SJA1000_ECC_STUFF 0x80 | |
105 | #define SJA1000_ECC_MASK 0xc0 | |
106 | ||
107 | /* Status register content */ | |
108 | #define SJA1000_SR_BS 0x80 | |
109 | #define SJA1000_SR_ES 0x40 | |
110 | ||
111 | #define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA | |
112 | ||
113 | /* | |
114 | * The device actually uses a 16MHz clock to generate the CAN clock | |
115 | * but it expects SJA1000 bit settings based on 8MHz (is internally | |
116 | * converted). | |
117 | */ | |
118 | #define EMS_USB_ARM7_CLOCK 8000000 | |
119 | ||
90cfde46 GU |
120 | #define CPC_TX_QUEUE_TRIGGER_LOW 25 |
121 | #define CPC_TX_QUEUE_TRIGGER_HIGH 35 | |
122 | ||
702171ad SH |
123 | /* |
124 | * CAN-Message representation in a CPC_MSG. Message object type is | |
125 | * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or | |
126 | * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME. | |
127 | */ | |
128 | struct cpc_can_msg { | |
8a4b5b0f | 129 | __le32 id; |
702171ad SH |
130 | u8 length; |
131 | u8 msg[8]; | |
132 | }; | |
133 | ||
134 | /* Representation of the CAN parameters for the SJA1000 controller */ | |
135 | struct cpc_sja1000_params { | |
136 | u8 mode; | |
137 | u8 acc_code0; | |
138 | u8 acc_code1; | |
139 | u8 acc_code2; | |
140 | u8 acc_code3; | |
141 | u8 acc_mask0; | |
142 | u8 acc_mask1; | |
143 | u8 acc_mask2; | |
144 | u8 acc_mask3; | |
145 | u8 btr0; | |
146 | u8 btr1; | |
147 | u8 outp_contr; | |
148 | }; | |
149 | ||
150 | /* CAN params message representation */ | |
151 | struct cpc_can_params { | |
152 | u8 cc_type; | |
153 | ||
154 | /* Will support M16C CAN controller in the future */ | |
155 | union { | |
156 | struct cpc_sja1000_params sja1000; | |
157 | } cc_params; | |
158 | }; | |
159 | ||
160 | /* Structure for confirmed message handling */ | |
161 | struct cpc_confirm { | |
162 | u8 error; /* error code */ | |
163 | }; | |
164 | ||
165 | /* Structure for overrun conditions */ | |
166 | struct cpc_overrun { | |
167 | u8 event; | |
168 | u8 count; | |
169 | }; | |
170 | ||
171 | /* SJA1000 CAN errors (compatible to NXP LPC2119) */ | |
172 | struct cpc_sja1000_can_error { | |
173 | u8 ecc; | |
174 | u8 rxerr; | |
175 | u8 txerr; | |
176 | }; | |
177 | ||
178 | /* structure for CAN error conditions */ | |
179 | struct cpc_can_error { | |
180 | u8 ecode; | |
181 | ||
182 | struct { | |
183 | u8 cc_type; | |
184 | ||
185 | /* Other controllers may also provide error code capture regs */ | |
186 | union { | |
187 | struct cpc_sja1000_can_error sja1000; | |
188 | } regs; | |
189 | } cc; | |
190 | }; | |
191 | ||
192 | /* | |
193 | * Structure containing RX/TX error counter. This structure is used to request | |
194 | * the values of the CAN controllers TX and RX error counter. | |
195 | */ | |
196 | struct cpc_can_err_counter { | |
197 | u8 rx; | |
198 | u8 tx; | |
199 | }; | |
200 | ||
201 | /* Main message type used between library and application */ | |
ba2d3587 | 202 | struct __packed ems_cpc_msg { |
702171ad SH |
203 | u8 type; /* type of message */ |
204 | u8 length; /* length of data within union 'msg' */ | |
205 | u8 msgid; /* confirmation handle */ | |
a0bc163a MKB |
206 | __le32 ts_sec; /* timestamp in seconds */ |
207 | __le32 ts_nsec; /* timestamp in nano seconds */ | |
702171ad SH |
208 | |
209 | union { | |
210 | u8 generic[64]; | |
211 | struct cpc_can_msg can_msg; | |
212 | struct cpc_can_params can_params; | |
213 | struct cpc_confirm confirmation; | |
214 | struct cpc_overrun overrun; | |
215 | struct cpc_can_error error; | |
216 | struct cpc_can_err_counter err_counter; | |
217 | u8 can_state; | |
218 | } msg; | |
219 | }; | |
220 | ||
221 | /* | |
222 | * Table of devices that work with this driver | |
223 | * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet. | |
224 | */ | |
225 | static struct usb_device_id ems_usb_table[] = { | |
226 | {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)}, | |
227 | {} /* Terminating entry */ | |
228 | }; | |
229 | ||
230 | MODULE_DEVICE_TABLE(usb, ems_usb_table); | |
231 | ||
232 | #define RX_BUFFER_SIZE 64 | |
233 | #define CPC_HEADER_SIZE 4 | |
234 | #define INTR_IN_BUFFER_SIZE 4 | |
235 | ||
236 | #define MAX_RX_URBS 10 | |
a6e4bc53 | 237 | #define MAX_TX_URBS 10 |
702171ad SH |
238 | |
239 | struct ems_usb; | |
240 | ||
241 | struct ems_tx_urb_context { | |
242 | struct ems_usb *dev; | |
243 | ||
244 | u32 echo_index; | |
245 | u8 dlc; | |
246 | }; | |
247 | ||
248 | struct ems_usb { | |
249 | struct can_priv can; /* must be the first member */ | |
702171ad SH |
250 | |
251 | struct sk_buff *echo_skb[MAX_TX_URBS]; | |
252 | ||
253 | struct usb_device *udev; | |
254 | struct net_device *netdev; | |
255 | ||
256 | atomic_t active_tx_urbs; | |
257 | struct usb_anchor tx_submitted; | |
258 | struct ems_tx_urb_context tx_contexts[MAX_TX_URBS]; | |
259 | ||
260 | struct usb_anchor rx_submitted; | |
261 | ||
262 | struct urb *intr_urb; | |
263 | ||
264 | u8 *tx_msg_buffer; | |
265 | ||
266 | u8 *intr_in_buffer; | |
267 | unsigned int free_slots; /* remember number of available slots */ | |
268 | ||
269 | struct ems_cpc_msg active_params; /* active controller parameters */ | |
270 | }; | |
271 | ||
272 | static void ems_usb_read_interrupt_callback(struct urb *urb) | |
273 | { | |
274 | struct ems_usb *dev = urb->context; | |
275 | struct net_device *netdev = dev->netdev; | |
276 | int err; | |
277 | ||
278 | if (!netif_device_present(netdev)) | |
279 | return; | |
280 | ||
281 | switch (urb->status) { | |
282 | case 0: | |
283 | dev->free_slots = dev->intr_in_buffer[1]; | |
59097ac9 MKB |
284 | if (dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH && |
285 | netif_queue_stopped(netdev)) | |
286 | netif_wake_queue(netdev); | |
702171ad SH |
287 | break; |
288 | ||
289 | case -ECONNRESET: /* unlink */ | |
290 | case -ENOENT: | |
291 | case -ESHUTDOWN: | |
292 | return; | |
293 | ||
294 | default: | |
aabdfd6a | 295 | netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status); |
702171ad SH |
296 | break; |
297 | } | |
298 | ||
299 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
300 | ||
301 | if (err == -ENODEV) | |
302 | netif_device_detach(netdev); | |
303 | else if (err) | |
aabdfd6a | 304 | netdev_err(netdev, "failed resubmitting intr urb: %d\n", err); |
702171ad SH |
305 | } |
306 | ||
307 | static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
308 | { | |
309 | struct can_frame *cf; | |
310 | struct sk_buff *skb; | |
311 | int i; | |
312 | struct net_device_stats *stats = &dev->netdev->stats; | |
313 | ||
7b6856a0 | 314 | skb = alloc_can_skb(dev->netdev, &cf); |
702171ad SH |
315 | if (skb == NULL) |
316 | return; | |
317 | ||
2b2072e9 | 318 | cf->can_id = le32_to_cpu(msg->msg.can_msg.id); |
c7cd606f | 319 | cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF); |
702171ad | 320 | |
8e95a202 JP |
321 | if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME || |
322 | msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) | |
702171ad SH |
323 | cf->can_id |= CAN_EFF_FLAG; |
324 | ||
8e95a202 JP |
325 | if (msg->type == CPC_MSG_TYPE_RTR_FRAME || |
326 | msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) { | |
702171ad SH |
327 | cf->can_id |= CAN_RTR_FLAG; |
328 | } else { | |
329 | for (i = 0; i < cf->can_dlc; i++) | |
330 | cf->data[i] = msg->msg.can_msg.msg[i]; | |
331 | } | |
332 | ||
702171ad SH |
333 | stats->rx_packets++; |
334 | stats->rx_bytes += cf->can_dlc; | |
43c021e8 | 335 | netif_rx(skb); |
702171ad SH |
336 | } |
337 | ||
338 | static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
339 | { | |
340 | struct can_frame *cf; | |
341 | struct sk_buff *skb; | |
342 | struct net_device_stats *stats = &dev->netdev->stats; | |
343 | ||
7b6856a0 | 344 | skb = alloc_can_err_skb(dev->netdev, &cf); |
702171ad SH |
345 | if (skb == NULL) |
346 | return; | |
347 | ||
702171ad SH |
348 | if (msg->type == CPC_MSG_TYPE_CAN_STATE) { |
349 | u8 state = msg->msg.can_state; | |
350 | ||
351 | if (state & SJA1000_SR_BS) { | |
352 | dev->can.state = CAN_STATE_BUS_OFF; | |
353 | cf->can_id |= CAN_ERR_BUSOFF; | |
354 | ||
be38a6f9 | 355 | dev->can.can_stats.bus_off++; |
702171ad SH |
356 | can_bus_off(dev->netdev); |
357 | } else if (state & SJA1000_SR_ES) { | |
358 | dev->can.state = CAN_STATE_ERROR_WARNING; | |
359 | dev->can.can_stats.error_warning++; | |
360 | } else { | |
361 | dev->can.state = CAN_STATE_ERROR_ACTIVE; | |
362 | dev->can.can_stats.error_passive++; | |
363 | } | |
364 | } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) { | |
365 | u8 ecc = msg->msg.error.cc.regs.sja1000.ecc; | |
366 | u8 txerr = msg->msg.error.cc.regs.sja1000.txerr; | |
367 | u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr; | |
368 | ||
369 | /* bus error interrupt */ | |
370 | dev->can.can_stats.bus_error++; | |
371 | stats->rx_errors++; | |
372 | ||
373 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; | |
374 | ||
375 | switch (ecc & SJA1000_ECC_MASK) { | |
376 | case SJA1000_ECC_BIT: | |
377 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
378 | break; | |
379 | case SJA1000_ECC_FORM: | |
380 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
381 | break; | |
382 | case SJA1000_ECC_STUFF: | |
383 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
384 | break; | |
385 | default: | |
702171ad SH |
386 | cf->data[3] = ecc & SJA1000_ECC_SEG; |
387 | break; | |
388 | } | |
389 | ||
25985edc | 390 | /* Error occurred during transmission? */ |
702171ad SH |
391 | if ((ecc & SJA1000_ECC_DIR) == 0) |
392 | cf->data[2] |= CAN_ERR_PROT_TX; | |
393 | ||
394 | if (dev->can.state == CAN_STATE_ERROR_WARNING || | |
395 | dev->can.state == CAN_STATE_ERROR_PASSIVE) { | |
396 | cf->data[1] = (txerr > rxerr) ? | |
397 | CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE; | |
398 | } | |
399 | } else if (msg->type == CPC_MSG_TYPE_OVERRUN) { | |
400 | cf->can_id |= CAN_ERR_CRTL; | |
401 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
402 | ||
403 | stats->rx_over_errors++; | |
404 | stats->rx_errors++; | |
405 | } | |
406 | ||
702171ad SH |
407 | stats->rx_packets++; |
408 | stats->rx_bytes += cf->can_dlc; | |
43c021e8 | 409 | netif_rx(skb); |
702171ad SH |
410 | } |
411 | ||
412 | /* | |
413 | * callback for bulk IN urb | |
414 | */ | |
415 | static void ems_usb_read_bulk_callback(struct urb *urb) | |
416 | { | |
417 | struct ems_usb *dev = urb->context; | |
418 | struct net_device *netdev; | |
419 | int retval; | |
420 | ||
421 | netdev = dev->netdev; | |
422 | ||
423 | if (!netif_device_present(netdev)) | |
424 | return; | |
425 | ||
426 | switch (urb->status) { | |
427 | case 0: /* success */ | |
428 | break; | |
429 | ||
430 | case -ENOENT: | |
431 | return; | |
432 | ||
433 | default: | |
aabdfd6a | 434 | netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status); |
702171ad SH |
435 | goto resubmit_urb; |
436 | } | |
437 | ||
438 | if (urb->actual_length > CPC_HEADER_SIZE) { | |
439 | struct ems_cpc_msg *msg; | |
440 | u8 *ibuf = urb->transfer_buffer; | |
4e2061b1 | 441 | u8 msg_count, start; |
702171ad SH |
442 | |
443 | msg_count = ibuf[0] & ~0x80; | |
702171ad SH |
444 | |
445 | start = CPC_HEADER_SIZE; | |
446 | ||
447 | while (msg_count) { | |
448 | msg = (struct ems_cpc_msg *)&ibuf[start]; | |
449 | ||
450 | switch (msg->type) { | |
451 | case CPC_MSG_TYPE_CAN_STATE: | |
452 | /* Process CAN state changes */ | |
453 | ems_usb_rx_err(dev, msg); | |
454 | break; | |
455 | ||
456 | case CPC_MSG_TYPE_CAN_FRAME: | |
457 | case CPC_MSG_TYPE_EXT_CAN_FRAME: | |
458 | case CPC_MSG_TYPE_RTR_FRAME: | |
459 | case CPC_MSG_TYPE_EXT_RTR_FRAME: | |
460 | ems_usb_rx_can_msg(dev, msg); | |
461 | break; | |
462 | ||
463 | case CPC_MSG_TYPE_CAN_FRAME_ERROR: | |
464 | /* Process errorframe */ | |
465 | ems_usb_rx_err(dev, msg); | |
466 | break; | |
467 | ||
468 | case CPC_MSG_TYPE_OVERRUN: | |
469 | /* Message lost while receiving */ | |
470 | ems_usb_rx_err(dev, msg); | |
471 | break; | |
472 | } | |
473 | ||
474 | start += CPC_MSG_HEADER_LEN + msg->length; | |
475 | msg_count--; | |
476 | ||
477 | if (start > urb->transfer_buffer_length) { | |
aabdfd6a | 478 | netdev_err(netdev, "format error\n"); |
702171ad SH |
479 | break; |
480 | } | |
481 | } | |
482 | } | |
483 | ||
484 | resubmit_urb: | |
485 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), | |
486 | urb->transfer_buffer, RX_BUFFER_SIZE, | |
487 | ems_usb_read_bulk_callback, dev); | |
488 | ||
489 | retval = usb_submit_urb(urb, GFP_ATOMIC); | |
490 | ||
491 | if (retval == -ENODEV) | |
492 | netif_device_detach(netdev); | |
493 | else if (retval) | |
aabdfd6a WG |
494 | netdev_err(netdev, |
495 | "failed resubmitting read bulk urb: %d\n", retval); | |
702171ad SH |
496 | } |
497 | ||
498 | /* | |
499 | * callback for bulk IN urb | |
500 | */ | |
501 | static void ems_usb_write_bulk_callback(struct urb *urb) | |
502 | { | |
503 | struct ems_tx_urb_context *context = urb->context; | |
504 | struct ems_usb *dev; | |
505 | struct net_device *netdev; | |
506 | ||
507 | BUG_ON(!context); | |
508 | ||
509 | dev = context->dev; | |
510 | netdev = dev->netdev; | |
511 | ||
512 | /* free up our allocated buffer */ | |
997ea58e DM |
513 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
514 | urb->transfer_buffer, urb->transfer_dma); | |
702171ad SH |
515 | |
516 | atomic_dec(&dev->active_tx_urbs); | |
517 | ||
518 | if (!netif_device_present(netdev)) | |
519 | return; | |
520 | ||
521 | if (urb->status) | |
aabdfd6a | 522 | netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); |
702171ad | 523 | |
860e9538 | 524 | netif_trans_update(netdev); |
702171ad SH |
525 | |
526 | /* transmission complete interrupt */ | |
527 | netdev->stats.tx_packets++; | |
528 | netdev->stats.tx_bytes += context->dlc; | |
529 | ||
530 | can_get_echo_skb(netdev, context->echo_index); | |
531 | ||
532 | /* Release context */ | |
533 | context->echo_index = MAX_TX_URBS; | |
534 | ||
702171ad SH |
535 | } |
536 | ||
537 | /* | |
538 | * Send the given CPC command synchronously | |
539 | */ | |
540 | static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
541 | { | |
542 | int actual_length; | |
543 | ||
544 | /* Copy payload */ | |
545 | memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg, | |
546 | msg->length + CPC_MSG_HEADER_LEN); | |
547 | ||
548 | /* Clear header */ | |
549 | memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE); | |
550 | ||
551 | return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), | |
552 | &dev->tx_msg_buffer[0], | |
553 | msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE, | |
554 | &actual_length, 1000); | |
555 | } | |
556 | ||
557 | /* | |
558 | * Change CAN controllers' mode register | |
559 | */ | |
560 | static int ems_usb_write_mode(struct ems_usb *dev, u8 mode) | |
561 | { | |
562 | dev->active_params.msg.can_params.cc_params.sja1000.mode = mode; | |
563 | ||
564 | return ems_usb_command_msg(dev, &dev->active_params); | |
565 | } | |
566 | ||
567 | /* | |
568 | * Send a CPC_Control command to change behaviour when interface receives a CAN | |
569 | * message, bus error or CAN state changed notifications. | |
570 | */ | |
571 | static int ems_usb_control_cmd(struct ems_usb *dev, u8 val) | |
572 | { | |
573 | struct ems_cpc_msg cmd; | |
574 | ||
575 | cmd.type = CPC_CMD_TYPE_CONTROL; | |
576 | cmd.length = CPC_MSG_HEADER_LEN + 1; | |
577 | ||
578 | cmd.msgid = 0; | |
579 | ||
580 | cmd.msg.generic[0] = val; | |
581 | ||
582 | return ems_usb_command_msg(dev, &cmd); | |
583 | } | |
584 | ||
585 | /* | |
586 | * Start interface | |
587 | */ | |
588 | static int ems_usb_start(struct ems_usb *dev) | |
589 | { | |
590 | struct net_device *netdev = dev->netdev; | |
591 | int err, i; | |
592 | ||
593 | dev->intr_in_buffer[0] = 0; | |
90cfde46 | 594 | dev->free_slots = 50; /* initial size */ |
702171ad SH |
595 | |
596 | for (i = 0; i < MAX_RX_URBS; i++) { | |
597 | struct urb *urb = NULL; | |
598 | u8 *buf = NULL; | |
599 | ||
600 | /* create a URB, and a buffer for it */ | |
601 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
602 | if (!urb) { | |
aabdfd6a | 603 | netdev_err(netdev, "No memory left for URBs\n"); |
2ee6850c SH |
604 | err = -ENOMEM; |
605 | break; | |
702171ad SH |
606 | } |
607 | ||
997ea58e DM |
608 | buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, |
609 | &urb->transfer_dma); | |
702171ad | 610 | if (!buf) { |
aabdfd6a | 611 | netdev_err(netdev, "No memory left for USB buffer\n"); |
702171ad | 612 | usb_free_urb(urb); |
2ee6850c SH |
613 | err = -ENOMEM; |
614 | break; | |
702171ad SH |
615 | } |
616 | ||
617 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), | |
618 | buf, RX_BUFFER_SIZE, | |
619 | ems_usb_read_bulk_callback, dev); | |
620 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
621 | usb_anchor_urb(urb, &dev->rx_submitted); | |
622 | ||
623 | err = usb_submit_urb(urb, GFP_KERNEL); | |
624 | if (err) { | |
702171ad | 625 | usb_unanchor_urb(urb); |
997ea58e DM |
626 | usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, |
627 | urb->transfer_dma); | |
a1c31f1d | 628 | usb_free_urb(urb); |
702171ad SH |
629 | break; |
630 | } | |
631 | ||
632 | /* Drop reference, USB core will take care of freeing it */ | |
633 | usb_free_urb(urb); | |
634 | } | |
635 | ||
636 | /* Did we submit any URBs */ | |
637 | if (i == 0) { | |
aabdfd6a | 638 | netdev_warn(netdev, "couldn't setup read URBs\n"); |
702171ad SH |
639 | return err; |
640 | } | |
641 | ||
642 | /* Warn if we've couldn't transmit all the URBs */ | |
643 | if (i < MAX_RX_URBS) | |
aabdfd6a | 644 | netdev_warn(netdev, "rx performance may be slow\n"); |
702171ad SH |
645 | |
646 | /* Setup and start interrupt URB */ | |
647 | usb_fill_int_urb(dev->intr_urb, dev->udev, | |
648 | usb_rcvintpipe(dev->udev, 1), | |
649 | dev->intr_in_buffer, | |
650 | INTR_IN_BUFFER_SIZE, | |
651 | ems_usb_read_interrupt_callback, dev, 1); | |
652 | ||
653 | err = usb_submit_urb(dev->intr_urb, GFP_KERNEL); | |
654 | if (err) { | |
aabdfd6a | 655 | netdev_warn(netdev, "intr URB submit failed: %d\n", err); |
702171ad SH |
656 | |
657 | return err; | |
658 | } | |
659 | ||
660 | /* CPC-USB will transfer received message to host */ | |
661 | err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON); | |
662 | if (err) | |
663 | goto failed; | |
664 | ||
665 | /* CPC-USB will transfer CAN state changes to host */ | |
666 | err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON); | |
667 | if (err) | |
668 | goto failed; | |
669 | ||
670 | /* CPC-USB will transfer bus errors to host */ | |
671 | err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON); | |
672 | if (err) | |
673 | goto failed; | |
674 | ||
675 | err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL); | |
676 | if (err) | |
677 | goto failed; | |
678 | ||
679 | dev->can.state = CAN_STATE_ERROR_ACTIVE; | |
680 | ||
681 | return 0; | |
682 | ||
683 | failed: | |
aabdfd6a | 684 | netdev_warn(netdev, "couldn't submit control: %d\n", err); |
702171ad SH |
685 | |
686 | return err; | |
687 | } | |
688 | ||
689 | static void unlink_all_urbs(struct ems_usb *dev) | |
690 | { | |
691 | int i; | |
692 | ||
693 | usb_unlink_urb(dev->intr_urb); | |
694 | ||
695 | usb_kill_anchored_urbs(&dev->rx_submitted); | |
696 | ||
697 | usb_kill_anchored_urbs(&dev->tx_submitted); | |
698 | atomic_set(&dev->active_tx_urbs, 0); | |
699 | ||
700 | for (i = 0; i < MAX_TX_URBS; i++) | |
701 | dev->tx_contexts[i].echo_index = MAX_TX_URBS; | |
702 | } | |
703 | ||
704 | static int ems_usb_open(struct net_device *netdev) | |
705 | { | |
706 | struct ems_usb *dev = netdev_priv(netdev); | |
707 | int err; | |
708 | ||
709 | err = ems_usb_write_mode(dev, SJA1000_MOD_RM); | |
710 | if (err) | |
711 | return err; | |
712 | ||
713 | /* common open */ | |
714 | err = open_candev(netdev); | |
715 | if (err) | |
716 | return err; | |
717 | ||
718 | /* finally start device */ | |
719 | err = ems_usb_start(dev); | |
720 | if (err) { | |
721 | if (err == -ENODEV) | |
722 | netif_device_detach(dev->netdev); | |
723 | ||
aabdfd6a | 724 | netdev_warn(netdev, "couldn't start device: %d\n", err); |
702171ad SH |
725 | |
726 | close_candev(netdev); | |
727 | ||
728 | return err; | |
729 | } | |
730 | ||
702171ad SH |
731 | |
732 | netif_start_queue(netdev); | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
737 | static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev) | |
738 | { | |
739 | struct ems_usb *dev = netdev_priv(netdev); | |
740 | struct ems_tx_urb_context *context = NULL; | |
741 | struct net_device_stats *stats = &netdev->stats; | |
742 | struct can_frame *cf = (struct can_frame *)skb->data; | |
743 | struct ems_cpc_msg *msg; | |
744 | struct urb *urb; | |
745 | u8 *buf; | |
746 | int i, err; | |
747 | size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN | |
748 | + sizeof(struct cpc_can_msg); | |
749 | ||
3ccd4c61 OH |
750 | if (can_dropped_invalid_skb(netdev, skb)) |
751 | return NETDEV_TX_OK; | |
752 | ||
702171ad SH |
753 | /* create a URB, and a buffer for it, and copy the data to the URB */ |
754 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
755 | if (!urb) { | |
aabdfd6a | 756 | netdev_err(netdev, "No memory left for URBs\n"); |
702171ad SH |
757 | goto nomem; |
758 | } | |
759 | ||
997ea58e | 760 | buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma); |
702171ad | 761 | if (!buf) { |
aabdfd6a | 762 | netdev_err(netdev, "No memory left for USB buffer\n"); |
702171ad SH |
763 | usb_free_urb(urb); |
764 | goto nomem; | |
765 | } | |
766 | ||
767 | msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE]; | |
768 | ||
8a4b5b0f | 769 | msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); |
702171ad SH |
770 | msg->msg.can_msg.length = cf->can_dlc; |
771 | ||
772 | if (cf->can_id & CAN_RTR_FLAG) { | |
773 | msg->type = cf->can_id & CAN_EFF_FLAG ? | |
774 | CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME; | |
775 | ||
776 | msg->length = CPC_CAN_MSG_MIN_SIZE; | |
777 | } else { | |
778 | msg->type = cf->can_id & CAN_EFF_FLAG ? | |
779 | CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME; | |
780 | ||
781 | for (i = 0; i < cf->can_dlc; i++) | |
782 | msg->msg.can_msg.msg[i] = cf->data[i]; | |
783 | ||
784 | msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc; | |
785 | } | |
786 | ||
787 | for (i = 0; i < MAX_TX_URBS; i++) { | |
788 | if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) { | |
789 | context = &dev->tx_contexts[i]; | |
790 | break; | |
791 | } | |
792 | } | |
793 | ||
794 | /* | |
795 | * May never happen! When this happens we'd more URBs in flight as | |
796 | * allowed (MAX_TX_URBS). | |
797 | */ | |
798 | if (!context) { | |
997ea58e | 799 | usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
a1c31f1d | 800 | usb_free_urb(urb); |
702171ad | 801 | |
aabdfd6a | 802 | netdev_warn(netdev, "couldn't find free context\n"); |
702171ad SH |
803 | |
804 | return NETDEV_TX_BUSY; | |
805 | } | |
806 | ||
807 | context->dev = dev; | |
808 | context->echo_index = i; | |
809 | context->dlc = cf->can_dlc; | |
810 | ||
811 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, | |
812 | size, ems_usb_write_bulk_callback, context); | |
813 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
814 | usb_anchor_urb(urb, &dev->tx_submitted); | |
815 | ||
816 | can_put_echo_skb(skb, netdev, context->echo_index); | |
817 | ||
818 | atomic_inc(&dev->active_tx_urbs); | |
819 | ||
820 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
821 | if (unlikely(err)) { | |
822 | can_free_echo_skb(netdev, context->echo_index); | |
823 | ||
824 | usb_unanchor_urb(urb); | |
997ea58e | 825 | usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
702171ad SH |
826 | dev_kfree_skb(skb); |
827 | ||
828 | atomic_dec(&dev->active_tx_urbs); | |
829 | ||
830 | if (err == -ENODEV) { | |
831 | netif_device_detach(netdev); | |
832 | } else { | |
aabdfd6a | 833 | netdev_warn(netdev, "failed tx_urb %d\n", err); |
702171ad SH |
834 | |
835 | stats->tx_dropped++; | |
836 | } | |
837 | } else { | |
860e9538 | 838 | netif_trans_update(netdev); |
702171ad SH |
839 | |
840 | /* Slow down tx path */ | |
841 | if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS || | |
90cfde46 | 842 | dev->free_slots < CPC_TX_QUEUE_TRIGGER_LOW) { |
702171ad SH |
843 | netif_stop_queue(netdev); |
844 | } | |
845 | } | |
846 | ||
847 | /* | |
848 | * Release our reference to this URB, the USB core will eventually free | |
849 | * it entirely. | |
850 | */ | |
851 | usb_free_urb(urb); | |
852 | ||
853 | return NETDEV_TX_OK; | |
854 | ||
855 | nomem: | |
ea3fb371 | 856 | dev_kfree_skb(skb); |
702171ad SH |
857 | stats->tx_dropped++; |
858 | ||
859 | return NETDEV_TX_OK; | |
860 | } | |
861 | ||
862 | static int ems_usb_close(struct net_device *netdev) | |
863 | { | |
864 | struct ems_usb *dev = netdev_priv(netdev); | |
865 | ||
866 | /* Stop polling */ | |
867 | unlink_all_urbs(dev); | |
868 | ||
869 | netif_stop_queue(netdev); | |
870 | ||
871 | /* Set CAN controller to reset mode */ | |
872 | if (ems_usb_write_mode(dev, SJA1000_MOD_RM)) | |
aabdfd6a | 873 | netdev_warn(netdev, "couldn't stop device"); |
702171ad SH |
874 | |
875 | close_candev(netdev); | |
876 | ||
702171ad SH |
877 | return 0; |
878 | } | |
879 | ||
880 | static const struct net_device_ops ems_usb_netdev_ops = { | |
881 | .ndo_open = ems_usb_open, | |
882 | .ndo_stop = ems_usb_close, | |
883 | .ndo_start_xmit = ems_usb_start_xmit, | |
c971fa2a | 884 | .ndo_change_mtu = can_change_mtu, |
702171ad SH |
885 | }; |
886 | ||
194b9a4c | 887 | static const struct can_bittiming_const ems_usb_bittiming_const = { |
702171ad SH |
888 | .name = "ems_usb", |
889 | .tseg1_min = 1, | |
890 | .tseg1_max = 16, | |
891 | .tseg2_min = 1, | |
892 | .tseg2_max = 8, | |
893 | .sjw_max = 4, | |
894 | .brp_min = 1, | |
895 | .brp_max = 64, | |
896 | .brp_inc = 1, | |
897 | }; | |
898 | ||
899 | static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode) | |
900 | { | |
901 | struct ems_usb *dev = netdev_priv(netdev); | |
902 | ||
702171ad SH |
903 | switch (mode) { |
904 | case CAN_MODE_START: | |
905 | if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL)) | |
aabdfd6a | 906 | netdev_warn(netdev, "couldn't start device"); |
702171ad SH |
907 | |
908 | if (netif_queue_stopped(netdev)) | |
909 | netif_wake_queue(netdev); | |
910 | break; | |
911 | ||
912 | default: | |
913 | return -EOPNOTSUPP; | |
914 | } | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | static int ems_usb_set_bittiming(struct net_device *netdev) | |
920 | { | |
921 | struct ems_usb *dev = netdev_priv(netdev); | |
922 | struct can_bittiming *bt = &dev->can.bittiming; | |
923 | u8 btr0, btr1; | |
924 | ||
925 | btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); | |
926 | btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | | |
927 | (((bt->phase_seg2 - 1) & 0x7) << 4); | |
928 | if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) | |
929 | btr1 |= 0x80; | |
930 | ||
aabdfd6a | 931 | netdev_info(netdev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1); |
702171ad SH |
932 | |
933 | dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0; | |
934 | dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1; | |
935 | ||
936 | return ems_usb_command_msg(dev, &dev->active_params); | |
937 | } | |
938 | ||
939 | static void init_params_sja1000(struct ems_cpc_msg *msg) | |
940 | { | |
941 | struct cpc_sja1000_params *sja1000 = | |
942 | &msg->msg.can_params.cc_params.sja1000; | |
943 | ||
944 | msg->type = CPC_CMD_TYPE_CAN_PARAMS; | |
945 | msg->length = sizeof(struct cpc_can_params); | |
946 | msg->msgid = 0; | |
947 | ||
948 | msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000; | |
949 | ||
950 | /* Acceptance filter open */ | |
951 | sja1000->acc_code0 = 0x00; | |
952 | sja1000->acc_code1 = 0x00; | |
953 | sja1000->acc_code2 = 0x00; | |
954 | sja1000->acc_code3 = 0x00; | |
955 | ||
956 | /* Acceptance filter open */ | |
957 | sja1000->acc_mask0 = 0xFF; | |
958 | sja1000->acc_mask1 = 0xFF; | |
959 | sja1000->acc_mask2 = 0xFF; | |
960 | sja1000->acc_mask3 = 0xFF; | |
961 | ||
962 | sja1000->btr0 = 0; | |
963 | sja1000->btr1 = 0; | |
964 | ||
965 | sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL; | |
966 | sja1000->mode = SJA1000_MOD_RM; | |
967 | } | |
968 | ||
969 | /* | |
970 | * probe function for new CPC-USB devices | |
971 | */ | |
972 | static int ems_usb_probe(struct usb_interface *intf, | |
973 | const struct usb_device_id *id) | |
974 | { | |
975 | struct net_device *netdev; | |
976 | struct ems_usb *dev; | |
977 | int i, err = -ENOMEM; | |
978 | ||
a6e4bc53 | 979 | netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS); |
702171ad | 980 | if (!netdev) { |
1c0b28b1 | 981 | dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n"); |
702171ad SH |
982 | return -ENOMEM; |
983 | } | |
984 | ||
985 | dev = netdev_priv(netdev); | |
986 | ||
987 | dev->udev = interface_to_usbdev(intf); | |
988 | dev->netdev = netdev; | |
989 | ||
990 | dev->can.state = CAN_STATE_STOPPED; | |
991 | dev->can.clock.freq = EMS_USB_ARM7_CLOCK; | |
992 | dev->can.bittiming_const = &ems_usb_bittiming_const; | |
993 | dev->can.do_set_bittiming = ems_usb_set_bittiming; | |
994 | dev->can.do_set_mode = ems_usb_set_mode; | |
ad72c347 | 995 | dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; |
702171ad | 996 | |
702171ad SH |
997 | netdev->netdev_ops = &ems_usb_netdev_ops; |
998 | ||
999 | netdev->flags |= IFF_ECHO; /* we support local echo */ | |
1000 | ||
1001 | init_usb_anchor(&dev->rx_submitted); | |
1002 | ||
1003 | init_usb_anchor(&dev->tx_submitted); | |
1004 | atomic_set(&dev->active_tx_urbs, 0); | |
1005 | ||
1006 | for (i = 0; i < MAX_TX_URBS; i++) | |
1007 | dev->tx_contexts[i].echo_index = MAX_TX_URBS; | |
1008 | ||
1009 | dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL); | |
1010 | if (!dev->intr_urb) { | |
1c0b28b1 | 1011 | dev_err(&intf->dev, "Couldn't alloc intr URB\n"); |
702171ad SH |
1012 | goto cleanup_candev; |
1013 | } | |
1014 | ||
1015 | dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL); | |
09da6c5f | 1016 | if (!dev->intr_in_buffer) |
702171ad | 1017 | goto cleanup_intr_urb; |
702171ad SH |
1018 | |
1019 | dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE + | |
1020 | sizeof(struct ems_cpc_msg), GFP_KERNEL); | |
14f8dc49 | 1021 | if (!dev->tx_msg_buffer) |
702171ad | 1022 | goto cleanup_intr_in_buffer; |
702171ad SH |
1023 | |
1024 | usb_set_intfdata(intf, dev); | |
1025 | ||
1026 | SET_NETDEV_DEV(netdev, &intf->dev); | |
1027 | ||
1028 | init_params_sja1000(&dev->active_params); | |
1029 | ||
1030 | err = ems_usb_command_msg(dev, &dev->active_params); | |
1031 | if (err) { | |
aabdfd6a | 1032 | netdev_err(netdev, "couldn't initialize controller: %d\n", err); |
702171ad SH |
1033 | goto cleanup_tx_msg_buffer; |
1034 | } | |
1035 | ||
1036 | err = register_candev(netdev); | |
1037 | if (err) { | |
aabdfd6a | 1038 | netdev_err(netdev, "couldn't register CAN device: %d\n", err); |
702171ad SH |
1039 | goto cleanup_tx_msg_buffer; |
1040 | } | |
1041 | ||
1042 | return 0; | |
1043 | ||
1044 | cleanup_tx_msg_buffer: | |
1045 | kfree(dev->tx_msg_buffer); | |
1046 | ||
1047 | cleanup_intr_in_buffer: | |
1048 | kfree(dev->intr_in_buffer); | |
1049 | ||
1050 | cleanup_intr_urb: | |
1051 | usb_free_urb(dev->intr_urb); | |
1052 | ||
1053 | cleanup_candev: | |
1054 | free_candev(netdev); | |
1055 | ||
1056 | return err; | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * called by the usb core when the device is removed from the system | |
1061 | */ | |
1062 | static void ems_usb_disconnect(struct usb_interface *intf) | |
1063 | { | |
1064 | struct ems_usb *dev = usb_get_intfdata(intf); | |
1065 | ||
1066 | usb_set_intfdata(intf, NULL); | |
1067 | ||
1068 | if (dev) { | |
1069 | unregister_netdev(dev->netdev); | |
1070 | free_candev(dev->netdev); | |
1071 | ||
1072 | unlink_all_urbs(dev); | |
1073 | ||
1074 | usb_free_urb(dev->intr_urb); | |
1075 | ||
1076 | kfree(dev->intr_in_buffer); | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | /* usb specific object needed to register this driver with the usb subsystem */ | |
1081 | static struct usb_driver ems_usb_driver = { | |
1082 | .name = "ems_usb", | |
1083 | .probe = ems_usb_probe, | |
1084 | .disconnect = ems_usb_disconnect, | |
1085 | .id_table = ems_usb_table, | |
1086 | }; | |
1087 | ||
d632eb1b | 1088 | module_usb_driver(ems_usb_driver); |