]>
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 | */ | |
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("Sebastian Haas <haas@ems-wuensche.com>"); | |
31 | MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces"); | |
32 | MODULE_LICENSE("GPL v2"); | |
33 | ||
34 | /* Control-Values for CPC_Control() Command Subject Selection */ | |
35 | #define CONTR_CAN_MESSAGE 0x04 | |
36 | #define CONTR_CAN_STATE 0x0C | |
37 | #define CONTR_BUS_ERROR 0x1C | |
38 | ||
39 | /* Control Command Actions */ | |
40 | #define CONTR_CONT_OFF 0 | |
41 | #define CONTR_CONT_ON 1 | |
42 | #define CONTR_ONCE 2 | |
43 | ||
44 | /* Messages from CPC to PC */ | |
45 | #define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */ | |
46 | #define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */ | |
47 | #define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */ | |
48 | #define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */ | |
49 | #define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */ | |
50 | #define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */ | |
51 | #define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */ | |
52 | #define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */ | |
53 | #define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */ | |
54 | #define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */ | |
55 | #define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */ | |
56 | ||
57 | /* Messages from the PC to the CPC interface */ | |
58 | #define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */ | |
59 | #define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */ | |
60 | #define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */ | |
61 | #define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */ | |
62 | #define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */ | |
63 | #define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */ | |
64 | #define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */ | |
65 | #define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */ | |
66 | ||
67 | #define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */ | |
68 | #define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */ | |
69 | #define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */ | |
70 | ||
71 | #define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */ | |
72 | ||
73 | #define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */ | |
74 | ||
75 | /* Overrun types */ | |
76 | #define CPC_OVR_EVENT_CAN 0x01 | |
77 | #define CPC_OVR_EVENT_CANSTATE 0x02 | |
78 | #define CPC_OVR_EVENT_BUSERROR 0x04 | |
79 | ||
80 | /* | |
81 | * If the CAN controller lost a message we indicate it with the highest bit | |
82 | * set in the count field. | |
83 | */ | |
84 | #define CPC_OVR_HW 0x80 | |
85 | ||
86 | /* Size of the "struct ems_cpc_msg" without the union */ | |
87 | #define CPC_MSG_HEADER_LEN 11 | |
88 | #define CPC_CAN_MSG_MIN_SIZE 5 | |
89 | ||
90 | /* Define these values to match your devices */ | |
91 | #define USB_CPCUSB_VENDOR_ID 0x12D6 | |
92 | ||
93 | #define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444 | |
94 | ||
95 | /* Mode register NXP LPC2119/SJA1000 CAN Controller */ | |
96 | #define SJA1000_MOD_NORMAL 0x00 | |
97 | #define SJA1000_MOD_RM 0x01 | |
98 | ||
99 | /* ECC register NXP LPC2119/SJA1000 CAN Controller */ | |
100 | #define SJA1000_ECC_SEG 0x1F | |
101 | #define SJA1000_ECC_DIR 0x20 | |
102 | #define SJA1000_ECC_ERR 0x06 | |
103 | #define SJA1000_ECC_BIT 0x00 | |
104 | #define SJA1000_ECC_FORM 0x40 | |
105 | #define SJA1000_ECC_STUFF 0x80 | |
106 | #define SJA1000_ECC_MASK 0xc0 | |
107 | ||
108 | /* Status register content */ | |
109 | #define SJA1000_SR_BS 0x80 | |
110 | #define SJA1000_SR_ES 0x40 | |
111 | ||
112 | #define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA | |
113 | ||
114 | /* | |
115 | * The device actually uses a 16MHz clock to generate the CAN clock | |
116 | * but it expects SJA1000 bit settings based on 8MHz (is internally | |
117 | * converted). | |
118 | */ | |
119 | #define EMS_USB_ARM7_CLOCK 8000000 | |
120 | ||
121 | /* | |
122 | * CAN-Message representation in a CPC_MSG. Message object type is | |
123 | * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or | |
124 | * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME. | |
125 | */ | |
126 | struct cpc_can_msg { | |
127 | u32 id; | |
128 | u8 length; | |
129 | u8 msg[8]; | |
130 | }; | |
131 | ||
132 | /* Representation of the CAN parameters for the SJA1000 controller */ | |
133 | struct cpc_sja1000_params { | |
134 | u8 mode; | |
135 | u8 acc_code0; | |
136 | u8 acc_code1; | |
137 | u8 acc_code2; | |
138 | u8 acc_code3; | |
139 | u8 acc_mask0; | |
140 | u8 acc_mask1; | |
141 | u8 acc_mask2; | |
142 | u8 acc_mask3; | |
143 | u8 btr0; | |
144 | u8 btr1; | |
145 | u8 outp_contr; | |
146 | }; | |
147 | ||
148 | /* CAN params message representation */ | |
149 | struct cpc_can_params { | |
150 | u8 cc_type; | |
151 | ||
152 | /* Will support M16C CAN controller in the future */ | |
153 | union { | |
154 | struct cpc_sja1000_params sja1000; | |
155 | } cc_params; | |
156 | }; | |
157 | ||
158 | /* Structure for confirmed message handling */ | |
159 | struct cpc_confirm { | |
160 | u8 error; /* error code */ | |
161 | }; | |
162 | ||
163 | /* Structure for overrun conditions */ | |
164 | struct cpc_overrun { | |
165 | u8 event; | |
166 | u8 count; | |
167 | }; | |
168 | ||
169 | /* SJA1000 CAN errors (compatible to NXP LPC2119) */ | |
170 | struct cpc_sja1000_can_error { | |
171 | u8 ecc; | |
172 | u8 rxerr; | |
173 | u8 txerr; | |
174 | }; | |
175 | ||
176 | /* structure for CAN error conditions */ | |
177 | struct cpc_can_error { | |
178 | u8 ecode; | |
179 | ||
180 | struct { | |
181 | u8 cc_type; | |
182 | ||
183 | /* Other controllers may also provide error code capture regs */ | |
184 | union { | |
185 | struct cpc_sja1000_can_error sja1000; | |
186 | } regs; | |
187 | } cc; | |
188 | }; | |
189 | ||
190 | /* | |
191 | * Structure containing RX/TX error counter. This structure is used to request | |
192 | * the values of the CAN controllers TX and RX error counter. | |
193 | */ | |
194 | struct cpc_can_err_counter { | |
195 | u8 rx; | |
196 | u8 tx; | |
197 | }; | |
198 | ||
199 | /* Main message type used between library and application */ | |
200 | struct __attribute__ ((packed)) ems_cpc_msg { | |
201 | u8 type; /* type of message */ | |
202 | u8 length; /* length of data within union 'msg' */ | |
203 | u8 msgid; /* confirmation handle */ | |
204 | u32 ts_sec; /* timestamp in seconds */ | |
205 | u32 ts_nsec; /* timestamp in nano seconds */ | |
206 | ||
207 | union { | |
208 | u8 generic[64]; | |
209 | struct cpc_can_msg can_msg; | |
210 | struct cpc_can_params can_params; | |
211 | struct cpc_confirm confirmation; | |
212 | struct cpc_overrun overrun; | |
213 | struct cpc_can_error error; | |
214 | struct cpc_can_err_counter err_counter; | |
215 | u8 can_state; | |
216 | } msg; | |
217 | }; | |
218 | ||
219 | /* | |
220 | * Table of devices that work with this driver | |
221 | * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet. | |
222 | */ | |
223 | static struct usb_device_id ems_usb_table[] = { | |
224 | {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)}, | |
225 | {} /* Terminating entry */ | |
226 | }; | |
227 | ||
228 | MODULE_DEVICE_TABLE(usb, ems_usb_table); | |
229 | ||
230 | #define RX_BUFFER_SIZE 64 | |
231 | #define CPC_HEADER_SIZE 4 | |
232 | #define INTR_IN_BUFFER_SIZE 4 | |
233 | ||
234 | #define MAX_RX_URBS 10 | |
a6e4bc53 | 235 | #define MAX_TX_URBS 10 |
702171ad SH |
236 | |
237 | struct ems_usb; | |
238 | ||
239 | struct ems_tx_urb_context { | |
240 | struct ems_usb *dev; | |
241 | ||
242 | u32 echo_index; | |
243 | u8 dlc; | |
244 | }; | |
245 | ||
246 | struct ems_usb { | |
247 | struct can_priv can; /* must be the first member */ | |
248 | int open_time; | |
249 | ||
250 | struct sk_buff *echo_skb[MAX_TX_URBS]; | |
251 | ||
252 | struct usb_device *udev; | |
253 | struct net_device *netdev; | |
254 | ||
255 | atomic_t active_tx_urbs; | |
256 | struct usb_anchor tx_submitted; | |
257 | struct ems_tx_urb_context tx_contexts[MAX_TX_URBS]; | |
258 | ||
259 | struct usb_anchor rx_submitted; | |
260 | ||
261 | struct urb *intr_urb; | |
262 | ||
263 | u8 *tx_msg_buffer; | |
264 | ||
265 | u8 *intr_in_buffer; | |
266 | unsigned int free_slots; /* remember number of available slots */ | |
267 | ||
268 | struct ems_cpc_msg active_params; /* active controller parameters */ | |
269 | }; | |
270 | ||
271 | static void ems_usb_read_interrupt_callback(struct urb *urb) | |
272 | { | |
273 | struct ems_usb *dev = urb->context; | |
274 | struct net_device *netdev = dev->netdev; | |
275 | int err; | |
276 | ||
277 | if (!netif_device_present(netdev)) | |
278 | return; | |
279 | ||
280 | switch (urb->status) { | |
281 | case 0: | |
282 | dev->free_slots = dev->intr_in_buffer[1]; | |
283 | break; | |
284 | ||
285 | case -ECONNRESET: /* unlink */ | |
286 | case -ENOENT: | |
287 | case -ESHUTDOWN: | |
288 | return; | |
289 | ||
290 | default: | |
291 | dev_info(netdev->dev.parent, "Rx interrupt aborted %d\n", | |
292 | urb->status); | |
293 | break; | |
294 | } | |
295 | ||
296 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
297 | ||
298 | if (err == -ENODEV) | |
299 | netif_device_detach(netdev); | |
300 | else if (err) | |
301 | dev_err(netdev->dev.parent, | |
302 | "failed resubmitting intr urb: %d\n", err); | |
303 | ||
304 | return; | |
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 | ||
333 | netif_rx(skb); | |
334 | ||
335 | stats->rx_packets++; | |
336 | stats->rx_bytes += cf->can_dlc; | |
337 | } | |
338 | ||
339 | static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
340 | { | |
341 | struct can_frame *cf; | |
342 | struct sk_buff *skb; | |
343 | struct net_device_stats *stats = &dev->netdev->stats; | |
344 | ||
7b6856a0 | 345 | skb = alloc_can_err_skb(dev->netdev, &cf); |
702171ad SH |
346 | if (skb == NULL) |
347 | return; | |
348 | ||
702171ad SH |
349 | if (msg->type == CPC_MSG_TYPE_CAN_STATE) { |
350 | u8 state = msg->msg.can_state; | |
351 | ||
352 | if (state & SJA1000_SR_BS) { | |
353 | dev->can.state = CAN_STATE_BUS_OFF; | |
354 | cf->can_id |= CAN_ERR_BUSOFF; | |
355 | ||
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: | |
386 | cf->data[2] |= CAN_ERR_PROT_UNSPEC; | |
387 | cf->data[3] = ecc & SJA1000_ECC_SEG; | |
388 | break; | |
389 | } | |
390 | ||
391 | /* Error occured during transmission? */ | |
392 | if ((ecc & SJA1000_ECC_DIR) == 0) | |
393 | cf->data[2] |= CAN_ERR_PROT_TX; | |
394 | ||
395 | if (dev->can.state == CAN_STATE_ERROR_WARNING || | |
396 | dev->can.state == CAN_STATE_ERROR_PASSIVE) { | |
397 | cf->data[1] = (txerr > rxerr) ? | |
398 | CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE; | |
399 | } | |
400 | } else if (msg->type == CPC_MSG_TYPE_OVERRUN) { | |
401 | cf->can_id |= CAN_ERR_CRTL; | |
402 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
403 | ||
404 | stats->rx_over_errors++; | |
405 | stats->rx_errors++; | |
406 | } | |
407 | ||
408 | netif_rx(skb); | |
409 | ||
410 | stats->rx_packets++; | |
411 | stats->rx_bytes += cf->can_dlc; | |
412 | } | |
413 | ||
414 | /* | |
415 | * callback for bulk IN urb | |
416 | */ | |
417 | static void ems_usb_read_bulk_callback(struct urb *urb) | |
418 | { | |
419 | struct ems_usb *dev = urb->context; | |
420 | struct net_device *netdev; | |
421 | int retval; | |
422 | ||
423 | netdev = dev->netdev; | |
424 | ||
425 | if (!netif_device_present(netdev)) | |
426 | return; | |
427 | ||
428 | switch (urb->status) { | |
429 | case 0: /* success */ | |
430 | break; | |
431 | ||
432 | case -ENOENT: | |
433 | return; | |
434 | ||
435 | default: | |
436 | dev_info(netdev->dev.parent, "Rx URB aborted (%d)\n", | |
437 | urb->status); | |
438 | goto resubmit_urb; | |
439 | } | |
440 | ||
441 | if (urb->actual_length > CPC_HEADER_SIZE) { | |
442 | struct ems_cpc_msg *msg; | |
443 | u8 *ibuf = urb->transfer_buffer; | |
444 | u8 msg_count, again, start; | |
445 | ||
446 | msg_count = ibuf[0] & ~0x80; | |
447 | again = ibuf[0] & 0x80; | |
448 | ||
449 | start = CPC_HEADER_SIZE; | |
450 | ||
451 | while (msg_count) { | |
452 | msg = (struct ems_cpc_msg *)&ibuf[start]; | |
453 | ||
454 | switch (msg->type) { | |
455 | case CPC_MSG_TYPE_CAN_STATE: | |
456 | /* Process CAN state changes */ | |
457 | ems_usb_rx_err(dev, msg); | |
458 | break; | |
459 | ||
460 | case CPC_MSG_TYPE_CAN_FRAME: | |
461 | case CPC_MSG_TYPE_EXT_CAN_FRAME: | |
462 | case CPC_MSG_TYPE_RTR_FRAME: | |
463 | case CPC_MSG_TYPE_EXT_RTR_FRAME: | |
464 | ems_usb_rx_can_msg(dev, msg); | |
465 | break; | |
466 | ||
467 | case CPC_MSG_TYPE_CAN_FRAME_ERROR: | |
468 | /* Process errorframe */ | |
469 | ems_usb_rx_err(dev, msg); | |
470 | break; | |
471 | ||
472 | case CPC_MSG_TYPE_OVERRUN: | |
473 | /* Message lost while receiving */ | |
474 | ems_usb_rx_err(dev, msg); | |
475 | break; | |
476 | } | |
477 | ||
478 | start += CPC_MSG_HEADER_LEN + msg->length; | |
479 | msg_count--; | |
480 | ||
481 | if (start > urb->transfer_buffer_length) { | |
482 | dev_err(netdev->dev.parent, "format error\n"); | |
483 | break; | |
484 | } | |
485 | } | |
486 | } | |
487 | ||
488 | resubmit_urb: | |
489 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), | |
490 | urb->transfer_buffer, RX_BUFFER_SIZE, | |
491 | ems_usb_read_bulk_callback, dev); | |
492 | ||
493 | retval = usb_submit_urb(urb, GFP_ATOMIC); | |
494 | ||
495 | if (retval == -ENODEV) | |
496 | netif_device_detach(netdev); | |
497 | else if (retval) | |
498 | dev_err(netdev->dev.parent, | |
499 | "failed resubmitting read bulk urb: %d\n", retval); | |
500 | ||
501 | return; | |
502 | } | |
503 | ||
504 | /* | |
505 | * callback for bulk IN urb | |
506 | */ | |
507 | static void ems_usb_write_bulk_callback(struct urb *urb) | |
508 | { | |
509 | struct ems_tx_urb_context *context = urb->context; | |
510 | struct ems_usb *dev; | |
511 | struct net_device *netdev; | |
512 | ||
513 | BUG_ON(!context); | |
514 | ||
515 | dev = context->dev; | |
516 | netdev = dev->netdev; | |
517 | ||
518 | /* free up our allocated buffer */ | |
519 | usb_buffer_free(urb->dev, urb->transfer_buffer_length, | |
520 | urb->transfer_buffer, urb->transfer_dma); | |
521 | ||
522 | atomic_dec(&dev->active_tx_urbs); | |
523 | ||
524 | if (!netif_device_present(netdev)) | |
525 | return; | |
526 | ||
527 | if (urb->status) | |
528 | dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n", | |
529 | urb->status); | |
530 | ||
531 | netdev->trans_start = jiffies; | |
532 | ||
533 | /* transmission complete interrupt */ | |
534 | netdev->stats.tx_packets++; | |
535 | netdev->stats.tx_bytes += context->dlc; | |
536 | ||
537 | can_get_echo_skb(netdev, context->echo_index); | |
538 | ||
539 | /* Release context */ | |
540 | context->echo_index = MAX_TX_URBS; | |
541 | ||
542 | if (netif_queue_stopped(netdev)) | |
543 | netif_wake_queue(netdev); | |
544 | } | |
545 | ||
546 | /* | |
547 | * Send the given CPC command synchronously | |
548 | */ | |
549 | static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
550 | { | |
551 | int actual_length; | |
552 | ||
553 | /* Copy payload */ | |
554 | memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg, | |
555 | msg->length + CPC_MSG_HEADER_LEN); | |
556 | ||
557 | /* Clear header */ | |
558 | memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE); | |
559 | ||
560 | return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), | |
561 | &dev->tx_msg_buffer[0], | |
562 | msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE, | |
563 | &actual_length, 1000); | |
564 | } | |
565 | ||
566 | /* | |
567 | * Change CAN controllers' mode register | |
568 | */ | |
569 | static int ems_usb_write_mode(struct ems_usb *dev, u8 mode) | |
570 | { | |
571 | dev->active_params.msg.can_params.cc_params.sja1000.mode = mode; | |
572 | ||
573 | return ems_usb_command_msg(dev, &dev->active_params); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Send a CPC_Control command to change behaviour when interface receives a CAN | |
578 | * message, bus error or CAN state changed notifications. | |
579 | */ | |
580 | static int ems_usb_control_cmd(struct ems_usb *dev, u8 val) | |
581 | { | |
582 | struct ems_cpc_msg cmd; | |
583 | ||
584 | cmd.type = CPC_CMD_TYPE_CONTROL; | |
585 | cmd.length = CPC_MSG_HEADER_LEN + 1; | |
586 | ||
587 | cmd.msgid = 0; | |
588 | ||
589 | cmd.msg.generic[0] = val; | |
590 | ||
591 | return ems_usb_command_msg(dev, &cmd); | |
592 | } | |
593 | ||
594 | /* | |
595 | * Start interface | |
596 | */ | |
597 | static int ems_usb_start(struct ems_usb *dev) | |
598 | { | |
599 | struct net_device *netdev = dev->netdev; | |
600 | int err, i; | |
601 | ||
602 | dev->intr_in_buffer[0] = 0; | |
603 | dev->free_slots = 15; /* initial size */ | |
604 | ||
605 | for (i = 0; i < MAX_RX_URBS; i++) { | |
606 | struct urb *urb = NULL; | |
607 | u8 *buf = NULL; | |
608 | ||
609 | /* create a URB, and a buffer for it */ | |
610 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
611 | if (!urb) { | |
612 | dev_err(netdev->dev.parent, | |
613 | "No memory left for URBs\n"); | |
614 | return -ENOMEM; | |
615 | } | |
616 | ||
617 | buf = usb_buffer_alloc(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, | |
618 | &urb->transfer_dma); | |
619 | if (!buf) { | |
620 | dev_err(netdev->dev.parent, | |
621 | "No memory left for USB buffer\n"); | |
622 | usb_free_urb(urb); | |
623 | return -ENOMEM; | |
624 | } | |
625 | ||
626 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), | |
627 | buf, RX_BUFFER_SIZE, | |
628 | ems_usb_read_bulk_callback, dev); | |
629 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
630 | usb_anchor_urb(urb, &dev->rx_submitted); | |
631 | ||
632 | err = usb_submit_urb(urb, GFP_KERNEL); | |
633 | if (err) { | |
634 | if (err == -ENODEV) | |
635 | netif_device_detach(dev->netdev); | |
636 | ||
637 | usb_unanchor_urb(urb); | |
638 | usb_buffer_free(dev->udev, RX_BUFFER_SIZE, buf, | |
639 | urb->transfer_dma); | |
640 | break; | |
641 | } | |
642 | ||
643 | /* Drop reference, USB core will take care of freeing it */ | |
644 | usb_free_urb(urb); | |
645 | } | |
646 | ||
647 | /* Did we submit any URBs */ | |
648 | if (i == 0) { | |
649 | dev_warn(netdev->dev.parent, "couldn't setup read URBs\n"); | |
650 | return err; | |
651 | } | |
652 | ||
653 | /* Warn if we've couldn't transmit all the URBs */ | |
654 | if (i < MAX_RX_URBS) | |
655 | dev_warn(netdev->dev.parent, "rx performance may be slow\n"); | |
656 | ||
657 | /* Setup and start interrupt URB */ | |
658 | usb_fill_int_urb(dev->intr_urb, dev->udev, | |
659 | usb_rcvintpipe(dev->udev, 1), | |
660 | dev->intr_in_buffer, | |
661 | INTR_IN_BUFFER_SIZE, | |
662 | ems_usb_read_interrupt_callback, dev, 1); | |
663 | ||
664 | err = usb_submit_urb(dev->intr_urb, GFP_KERNEL); | |
665 | if (err) { | |
666 | if (err == -ENODEV) | |
667 | netif_device_detach(dev->netdev); | |
668 | ||
669 | dev_warn(netdev->dev.parent, "intr URB submit failed: %d\n", | |
670 | err); | |
671 | ||
672 | return err; | |
673 | } | |
674 | ||
675 | /* CPC-USB will transfer received message to host */ | |
676 | err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON); | |
677 | if (err) | |
678 | goto failed; | |
679 | ||
680 | /* CPC-USB will transfer CAN state changes to host */ | |
681 | err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON); | |
682 | if (err) | |
683 | goto failed; | |
684 | ||
685 | /* CPC-USB will transfer bus errors to host */ | |
686 | err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON); | |
687 | if (err) | |
688 | goto failed; | |
689 | ||
690 | err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL); | |
691 | if (err) | |
692 | goto failed; | |
693 | ||
694 | dev->can.state = CAN_STATE_ERROR_ACTIVE; | |
695 | ||
696 | return 0; | |
697 | ||
698 | failed: | |
699 | if (err == -ENODEV) | |
700 | netif_device_detach(dev->netdev); | |
701 | ||
702 | dev_warn(netdev->dev.parent, "couldn't submit control: %d\n", err); | |
703 | ||
704 | return err; | |
705 | } | |
706 | ||
707 | static void unlink_all_urbs(struct ems_usb *dev) | |
708 | { | |
709 | int i; | |
710 | ||
711 | usb_unlink_urb(dev->intr_urb); | |
712 | ||
713 | usb_kill_anchored_urbs(&dev->rx_submitted); | |
714 | ||
715 | usb_kill_anchored_urbs(&dev->tx_submitted); | |
716 | atomic_set(&dev->active_tx_urbs, 0); | |
717 | ||
718 | for (i = 0; i < MAX_TX_URBS; i++) | |
719 | dev->tx_contexts[i].echo_index = MAX_TX_URBS; | |
720 | } | |
721 | ||
722 | static int ems_usb_open(struct net_device *netdev) | |
723 | { | |
724 | struct ems_usb *dev = netdev_priv(netdev); | |
725 | int err; | |
726 | ||
727 | err = ems_usb_write_mode(dev, SJA1000_MOD_RM); | |
728 | if (err) | |
729 | return err; | |
730 | ||
731 | /* common open */ | |
732 | err = open_candev(netdev); | |
733 | if (err) | |
734 | return err; | |
735 | ||
736 | /* finally start device */ | |
737 | err = ems_usb_start(dev); | |
738 | if (err) { | |
739 | if (err == -ENODEV) | |
740 | netif_device_detach(dev->netdev); | |
741 | ||
742 | dev_warn(netdev->dev.parent, "couldn't start device: %d\n", | |
743 | err); | |
744 | ||
745 | close_candev(netdev); | |
746 | ||
747 | return err; | |
748 | } | |
749 | ||
750 | dev->open_time = jiffies; | |
751 | ||
752 | netif_start_queue(netdev); | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
757 | static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev) | |
758 | { | |
759 | struct ems_usb *dev = netdev_priv(netdev); | |
760 | struct ems_tx_urb_context *context = NULL; | |
761 | struct net_device_stats *stats = &netdev->stats; | |
762 | struct can_frame *cf = (struct can_frame *)skb->data; | |
763 | struct ems_cpc_msg *msg; | |
764 | struct urb *urb; | |
765 | u8 *buf; | |
766 | int i, err; | |
767 | size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN | |
768 | + sizeof(struct cpc_can_msg); | |
769 | ||
3ccd4c61 OH |
770 | if (can_dropped_invalid_skb(netdev, skb)) |
771 | return NETDEV_TX_OK; | |
772 | ||
702171ad SH |
773 | /* create a URB, and a buffer for it, and copy the data to the URB */ |
774 | urb = usb_alloc_urb(0, GFP_ATOMIC); | |
775 | if (!urb) { | |
776 | dev_err(netdev->dev.parent, "No memory left for URBs\n"); | |
777 | goto nomem; | |
778 | } | |
779 | ||
780 | buf = usb_buffer_alloc(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma); | |
781 | if (!buf) { | |
782 | dev_err(netdev->dev.parent, "No memory left for USB buffer\n"); | |
783 | usb_free_urb(urb); | |
784 | goto nomem; | |
785 | } | |
786 | ||
787 | msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE]; | |
788 | ||
789 | msg->msg.can_msg.id = cf->can_id & CAN_ERR_MASK; | |
790 | msg->msg.can_msg.length = cf->can_dlc; | |
791 | ||
792 | if (cf->can_id & CAN_RTR_FLAG) { | |
793 | msg->type = cf->can_id & CAN_EFF_FLAG ? | |
794 | CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME; | |
795 | ||
796 | msg->length = CPC_CAN_MSG_MIN_SIZE; | |
797 | } else { | |
798 | msg->type = cf->can_id & CAN_EFF_FLAG ? | |
799 | CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME; | |
800 | ||
801 | for (i = 0; i < cf->can_dlc; i++) | |
802 | msg->msg.can_msg.msg[i] = cf->data[i]; | |
803 | ||
804 | msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc; | |
805 | } | |
806 | ||
2b2072e9 SH |
807 | /* Respect byte order */ |
808 | msg->msg.can_msg.id = cpu_to_le32(msg->msg.can_msg.id); | |
809 | ||
702171ad SH |
810 | for (i = 0; i < MAX_TX_URBS; i++) { |
811 | if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) { | |
812 | context = &dev->tx_contexts[i]; | |
813 | break; | |
814 | } | |
815 | } | |
816 | ||
817 | /* | |
818 | * May never happen! When this happens we'd more URBs in flight as | |
819 | * allowed (MAX_TX_URBS). | |
820 | */ | |
821 | if (!context) { | |
822 | usb_unanchor_urb(urb); | |
823 | usb_buffer_free(dev->udev, size, buf, urb->transfer_dma); | |
824 | ||
825 | dev_warn(netdev->dev.parent, "couldn't find free context\n"); | |
826 | ||
827 | return NETDEV_TX_BUSY; | |
828 | } | |
829 | ||
830 | context->dev = dev; | |
831 | context->echo_index = i; | |
832 | context->dlc = cf->can_dlc; | |
833 | ||
834 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, | |
835 | size, ems_usb_write_bulk_callback, context); | |
836 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
837 | usb_anchor_urb(urb, &dev->tx_submitted); | |
838 | ||
839 | can_put_echo_skb(skb, netdev, context->echo_index); | |
840 | ||
841 | atomic_inc(&dev->active_tx_urbs); | |
842 | ||
843 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
844 | if (unlikely(err)) { | |
845 | can_free_echo_skb(netdev, context->echo_index); | |
846 | ||
847 | usb_unanchor_urb(urb); | |
848 | usb_buffer_free(dev->udev, size, buf, urb->transfer_dma); | |
849 | dev_kfree_skb(skb); | |
850 | ||
851 | atomic_dec(&dev->active_tx_urbs); | |
852 | ||
853 | if (err == -ENODEV) { | |
854 | netif_device_detach(netdev); | |
855 | } else { | |
856 | dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err); | |
857 | ||
858 | stats->tx_dropped++; | |
859 | } | |
860 | } else { | |
861 | netdev->trans_start = jiffies; | |
862 | ||
863 | /* Slow down tx path */ | |
864 | if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS || | |
865 | dev->free_slots < 5) { | |
866 | netif_stop_queue(netdev); | |
867 | } | |
868 | } | |
869 | ||
870 | /* | |
871 | * Release our reference to this URB, the USB core will eventually free | |
872 | * it entirely. | |
873 | */ | |
874 | usb_free_urb(urb); | |
875 | ||
876 | return NETDEV_TX_OK; | |
877 | ||
878 | nomem: | |
ea3fb371 | 879 | dev_kfree_skb(skb); |
702171ad SH |
880 | stats->tx_dropped++; |
881 | ||
882 | return NETDEV_TX_OK; | |
883 | } | |
884 | ||
885 | static int ems_usb_close(struct net_device *netdev) | |
886 | { | |
887 | struct ems_usb *dev = netdev_priv(netdev); | |
888 | ||
889 | /* Stop polling */ | |
890 | unlink_all_urbs(dev); | |
891 | ||
892 | netif_stop_queue(netdev); | |
893 | ||
894 | /* Set CAN controller to reset mode */ | |
895 | if (ems_usb_write_mode(dev, SJA1000_MOD_RM)) | |
896 | dev_warn(netdev->dev.parent, "couldn't stop device"); | |
897 | ||
898 | close_candev(netdev); | |
899 | ||
900 | dev->open_time = 0; | |
901 | ||
902 | return 0; | |
903 | } | |
904 | ||
905 | static const struct net_device_ops ems_usb_netdev_ops = { | |
906 | .ndo_open = ems_usb_open, | |
907 | .ndo_stop = ems_usb_close, | |
908 | .ndo_start_xmit = ems_usb_start_xmit, | |
909 | }; | |
910 | ||
911 | static struct can_bittiming_const ems_usb_bittiming_const = { | |
912 | .name = "ems_usb", | |
913 | .tseg1_min = 1, | |
914 | .tseg1_max = 16, | |
915 | .tseg2_min = 1, | |
916 | .tseg2_max = 8, | |
917 | .sjw_max = 4, | |
918 | .brp_min = 1, | |
919 | .brp_max = 64, | |
920 | .brp_inc = 1, | |
921 | }; | |
922 | ||
923 | static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode) | |
924 | { | |
925 | struct ems_usb *dev = netdev_priv(netdev); | |
926 | ||
927 | if (!dev->open_time) | |
928 | return -EINVAL; | |
929 | ||
930 | switch (mode) { | |
931 | case CAN_MODE_START: | |
932 | if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL)) | |
933 | dev_warn(netdev->dev.parent, "couldn't start device"); | |
934 | ||
935 | if (netif_queue_stopped(netdev)) | |
936 | netif_wake_queue(netdev); | |
937 | break; | |
938 | ||
939 | default: | |
940 | return -EOPNOTSUPP; | |
941 | } | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
946 | static int ems_usb_set_bittiming(struct net_device *netdev) | |
947 | { | |
948 | struct ems_usb *dev = netdev_priv(netdev); | |
949 | struct can_bittiming *bt = &dev->can.bittiming; | |
950 | u8 btr0, btr1; | |
951 | ||
952 | btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6); | |
953 | btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) | | |
954 | (((bt->phase_seg2 - 1) & 0x7) << 4); | |
955 | if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) | |
956 | btr1 |= 0x80; | |
957 | ||
958 | dev_info(netdev->dev.parent, "setting BTR0=0x%02x BTR1=0x%02x\n", | |
959 | btr0, btr1); | |
960 | ||
961 | dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0; | |
962 | dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1; | |
963 | ||
964 | return ems_usb_command_msg(dev, &dev->active_params); | |
965 | } | |
966 | ||
967 | static void init_params_sja1000(struct ems_cpc_msg *msg) | |
968 | { | |
969 | struct cpc_sja1000_params *sja1000 = | |
970 | &msg->msg.can_params.cc_params.sja1000; | |
971 | ||
972 | msg->type = CPC_CMD_TYPE_CAN_PARAMS; | |
973 | msg->length = sizeof(struct cpc_can_params); | |
974 | msg->msgid = 0; | |
975 | ||
976 | msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000; | |
977 | ||
978 | /* Acceptance filter open */ | |
979 | sja1000->acc_code0 = 0x00; | |
980 | sja1000->acc_code1 = 0x00; | |
981 | sja1000->acc_code2 = 0x00; | |
982 | sja1000->acc_code3 = 0x00; | |
983 | ||
984 | /* Acceptance filter open */ | |
985 | sja1000->acc_mask0 = 0xFF; | |
986 | sja1000->acc_mask1 = 0xFF; | |
987 | sja1000->acc_mask2 = 0xFF; | |
988 | sja1000->acc_mask3 = 0xFF; | |
989 | ||
990 | sja1000->btr0 = 0; | |
991 | sja1000->btr1 = 0; | |
992 | ||
993 | sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL; | |
994 | sja1000->mode = SJA1000_MOD_RM; | |
995 | } | |
996 | ||
997 | /* | |
998 | * probe function for new CPC-USB devices | |
999 | */ | |
1000 | static int ems_usb_probe(struct usb_interface *intf, | |
1001 | const struct usb_device_id *id) | |
1002 | { | |
1003 | struct net_device *netdev; | |
1004 | struct ems_usb *dev; | |
1005 | int i, err = -ENOMEM; | |
1006 | ||
a6e4bc53 | 1007 | netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS); |
702171ad | 1008 | if (!netdev) { |
1c0b28b1 | 1009 | dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n"); |
702171ad SH |
1010 | return -ENOMEM; |
1011 | } | |
1012 | ||
1013 | dev = netdev_priv(netdev); | |
1014 | ||
1015 | dev->udev = interface_to_usbdev(intf); | |
1016 | dev->netdev = netdev; | |
1017 | ||
1018 | dev->can.state = CAN_STATE_STOPPED; | |
1019 | dev->can.clock.freq = EMS_USB_ARM7_CLOCK; | |
1020 | dev->can.bittiming_const = &ems_usb_bittiming_const; | |
1021 | dev->can.do_set_bittiming = ems_usb_set_bittiming; | |
1022 | dev->can.do_set_mode = ems_usb_set_mode; | |
ad72c347 | 1023 | dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; |
702171ad | 1024 | |
702171ad SH |
1025 | netdev->netdev_ops = &ems_usb_netdev_ops; |
1026 | ||
1027 | netdev->flags |= IFF_ECHO; /* we support local echo */ | |
1028 | ||
1029 | init_usb_anchor(&dev->rx_submitted); | |
1030 | ||
1031 | init_usb_anchor(&dev->tx_submitted); | |
1032 | atomic_set(&dev->active_tx_urbs, 0); | |
1033 | ||
1034 | for (i = 0; i < MAX_TX_URBS; i++) | |
1035 | dev->tx_contexts[i].echo_index = MAX_TX_URBS; | |
1036 | ||
1037 | dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL); | |
1038 | if (!dev->intr_urb) { | |
1c0b28b1 | 1039 | dev_err(&intf->dev, "Couldn't alloc intr URB\n"); |
702171ad SH |
1040 | goto cleanup_candev; |
1041 | } | |
1042 | ||
1043 | dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL); | |
1044 | if (!dev->intr_in_buffer) { | |
1c0b28b1 | 1045 | dev_err(&intf->dev, "Couldn't alloc Intr buffer\n"); |
702171ad SH |
1046 | goto cleanup_intr_urb; |
1047 | } | |
1048 | ||
1049 | dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE + | |
1050 | sizeof(struct ems_cpc_msg), GFP_KERNEL); | |
1051 | if (!dev->tx_msg_buffer) { | |
1c0b28b1 | 1052 | dev_err(&intf->dev, "Couldn't alloc Tx buffer\n"); |
702171ad SH |
1053 | goto cleanup_intr_in_buffer; |
1054 | } | |
1055 | ||
1056 | usb_set_intfdata(intf, dev); | |
1057 | ||
1058 | SET_NETDEV_DEV(netdev, &intf->dev); | |
1059 | ||
1060 | init_params_sja1000(&dev->active_params); | |
1061 | ||
1062 | err = ems_usb_command_msg(dev, &dev->active_params); | |
1063 | if (err) { | |
1064 | dev_err(netdev->dev.parent, | |
1065 | "couldn't initialize controller: %d\n", err); | |
1066 | goto cleanup_tx_msg_buffer; | |
1067 | } | |
1068 | ||
1069 | err = register_candev(netdev); | |
1070 | if (err) { | |
1071 | dev_err(netdev->dev.parent, | |
1072 | "couldn't register CAN device: %d\n", err); | |
1073 | goto cleanup_tx_msg_buffer; | |
1074 | } | |
1075 | ||
1076 | return 0; | |
1077 | ||
1078 | cleanup_tx_msg_buffer: | |
1079 | kfree(dev->tx_msg_buffer); | |
1080 | ||
1081 | cleanup_intr_in_buffer: | |
1082 | kfree(dev->intr_in_buffer); | |
1083 | ||
1084 | cleanup_intr_urb: | |
1085 | usb_free_urb(dev->intr_urb); | |
1086 | ||
1087 | cleanup_candev: | |
1088 | free_candev(netdev); | |
1089 | ||
1090 | return err; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * called by the usb core when the device is removed from the system | |
1095 | */ | |
1096 | static void ems_usb_disconnect(struct usb_interface *intf) | |
1097 | { | |
1098 | struct ems_usb *dev = usb_get_intfdata(intf); | |
1099 | ||
1100 | usb_set_intfdata(intf, NULL); | |
1101 | ||
1102 | if (dev) { | |
1103 | unregister_netdev(dev->netdev); | |
1104 | free_candev(dev->netdev); | |
1105 | ||
1106 | unlink_all_urbs(dev); | |
1107 | ||
1108 | usb_free_urb(dev->intr_urb); | |
1109 | ||
1110 | kfree(dev->intr_in_buffer); | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | /* usb specific object needed to register this driver with the usb subsystem */ | |
1115 | static struct usb_driver ems_usb_driver = { | |
1116 | .name = "ems_usb", | |
1117 | .probe = ems_usb_probe, | |
1118 | .disconnect = ems_usb_disconnect, | |
1119 | .id_table = ems_usb_table, | |
1120 | }; | |
1121 | ||
1122 | static int __init ems_usb_init(void) | |
1123 | { | |
1124 | int err; | |
1125 | ||
1126 | printk(KERN_INFO "CPC-USB kernel driver loaded\n"); | |
1127 | ||
1128 | /* register this driver with the USB subsystem */ | |
1129 | err = usb_register(&ems_usb_driver); | |
1130 | ||
1131 | if (err) { | |
1132 | err("usb_register failed. Error number %d\n", err); | |
1133 | return err; | |
1134 | } | |
1135 | ||
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | static void __exit ems_usb_exit(void) | |
1140 | { | |
1141 | /* deregister this driver with the USB subsystem */ | |
1142 | usb_deregister(&ems_usb_driver); | |
1143 | } | |
1144 | ||
1145 | module_init(ems_usb_init); | |
1146 | module_exit(ems_usb_exit); |