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935912c5 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
702171ad SH |
2 | /* |
3 | * CAN driver for EMS Dr. Thomas Wuensche CPC-USB/ARM7 | |
4 | * | |
5 | * Copyright (C) 2004-2009 EMS Dr. Thomas Wuensche | |
702171ad | 6 | */ |
409c188c | 7 | #include <linux/ethtool.h> |
702171ad SH |
8 | #include <linux/signal.h> |
9 | #include <linux/slab.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/netdevice.h> | |
12 | #include <linux/usb.h> | |
13 | ||
14 | #include <linux/can.h> | |
15 | #include <linux/can/dev.h> | |
16 | #include <linux/can/error.h> | |
17 | ||
18 | MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>"); | |
19 | MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces"); | |
20 | MODULE_LICENSE("GPL v2"); | |
21 | ||
22 | /* Control-Values for CPC_Control() Command Subject Selection */ | |
23 | #define CONTR_CAN_MESSAGE 0x04 | |
24 | #define CONTR_CAN_STATE 0x0C | |
25 | #define CONTR_BUS_ERROR 0x1C | |
26 | ||
27 | /* Control Command Actions */ | |
28 | #define CONTR_CONT_OFF 0 | |
29 | #define CONTR_CONT_ON 1 | |
30 | #define CONTR_ONCE 2 | |
31 | ||
32 | /* Messages from CPC to PC */ | |
33 | #define CPC_MSG_TYPE_CAN_FRAME 1 /* CAN data frame */ | |
34 | #define CPC_MSG_TYPE_RTR_FRAME 8 /* CAN remote frame */ | |
35 | #define CPC_MSG_TYPE_CAN_PARAMS 12 /* Actual CAN parameters */ | |
36 | #define CPC_MSG_TYPE_CAN_STATE 14 /* CAN state message */ | |
37 | #define CPC_MSG_TYPE_EXT_CAN_FRAME 16 /* Extended CAN data frame */ | |
38 | #define CPC_MSG_TYPE_EXT_RTR_FRAME 17 /* Extended remote frame */ | |
39 | #define CPC_MSG_TYPE_CONTROL 19 /* change interface behavior */ | |
40 | #define CPC_MSG_TYPE_CONFIRM 20 /* command processed confirmation */ | |
41 | #define CPC_MSG_TYPE_OVERRUN 21 /* overrun events */ | |
42 | #define CPC_MSG_TYPE_CAN_FRAME_ERROR 23 /* detected bus errors */ | |
43 | #define CPC_MSG_TYPE_ERR_COUNTER 25 /* RX/TX error counter */ | |
44 | ||
45 | /* Messages from the PC to the CPC interface */ | |
46 | #define CPC_CMD_TYPE_CAN_FRAME 1 /* CAN data frame */ | |
47 | #define CPC_CMD_TYPE_CONTROL 3 /* control of interface behavior */ | |
48 | #define CPC_CMD_TYPE_CAN_PARAMS 6 /* set CAN parameters */ | |
49 | #define CPC_CMD_TYPE_RTR_FRAME 13 /* CAN remote frame */ | |
50 | #define CPC_CMD_TYPE_CAN_STATE 14 /* CAN state message */ | |
51 | #define CPC_CMD_TYPE_EXT_CAN_FRAME 15 /* Extended CAN data frame */ | |
52 | #define CPC_CMD_TYPE_EXT_RTR_FRAME 16 /* Extended CAN remote frame */ | |
53 | #define CPC_CMD_TYPE_CAN_EXIT 200 /* exit the CAN */ | |
54 | ||
55 | #define CPC_CMD_TYPE_INQ_ERR_COUNTER 25 /* request the CAN error counters */ | |
56 | #define CPC_CMD_TYPE_CLEAR_MSG_QUEUE 8 /* clear CPC_MSG queue */ | |
57 | #define CPC_CMD_TYPE_CLEAR_CMD_QUEUE 28 /* clear CPC_CMD queue */ | |
58 | ||
59 | #define CPC_CC_TYPE_SJA1000 2 /* Philips basic CAN controller */ | |
60 | ||
61 | #define CPC_CAN_ECODE_ERRFRAME 0x01 /* Ecode type */ | |
62 | ||
63 | /* Overrun types */ | |
64 | #define CPC_OVR_EVENT_CAN 0x01 | |
65 | #define CPC_OVR_EVENT_CANSTATE 0x02 | |
66 | #define CPC_OVR_EVENT_BUSERROR 0x04 | |
67 | ||
68 | /* | |
69 | * If the CAN controller lost a message we indicate it with the highest bit | |
70 | * set in the count field. | |
71 | */ | |
72 | #define CPC_OVR_HW 0x80 | |
73 | ||
74 | /* Size of the "struct ems_cpc_msg" without the union */ | |
75 | #define CPC_MSG_HEADER_LEN 11 | |
76 | #define CPC_CAN_MSG_MIN_SIZE 5 | |
77 | ||
78 | /* Define these values to match your devices */ | |
79 | #define USB_CPCUSB_VENDOR_ID 0x12D6 | |
80 | ||
81 | #define USB_CPCUSB_ARM7_PRODUCT_ID 0x0444 | |
82 | ||
83 | /* Mode register NXP LPC2119/SJA1000 CAN Controller */ | |
84 | #define SJA1000_MOD_NORMAL 0x00 | |
85 | #define SJA1000_MOD_RM 0x01 | |
86 | ||
87 | /* ECC register NXP LPC2119/SJA1000 CAN Controller */ | |
88 | #define SJA1000_ECC_SEG 0x1F | |
89 | #define SJA1000_ECC_DIR 0x20 | |
90 | #define SJA1000_ECC_ERR 0x06 | |
91 | #define SJA1000_ECC_BIT 0x00 | |
92 | #define SJA1000_ECC_FORM 0x40 | |
93 | #define SJA1000_ECC_STUFF 0x80 | |
94 | #define SJA1000_ECC_MASK 0xc0 | |
95 | ||
96 | /* Status register content */ | |
97 | #define SJA1000_SR_BS 0x80 | |
98 | #define SJA1000_SR_ES 0x40 | |
99 | ||
100 | #define SJA1000_DEFAULT_OUTPUT_CONTROL 0xDA | |
101 | ||
102 | /* | |
103 | * The device actually uses a 16MHz clock to generate the CAN clock | |
104 | * but it expects SJA1000 bit settings based on 8MHz (is internally | |
105 | * converted). | |
106 | */ | |
107 | #define EMS_USB_ARM7_CLOCK 8000000 | |
108 | ||
90cfde46 GU |
109 | #define CPC_TX_QUEUE_TRIGGER_LOW 25 |
110 | #define CPC_TX_QUEUE_TRIGGER_HIGH 35 | |
111 | ||
702171ad SH |
112 | /* |
113 | * CAN-Message representation in a CPC_MSG. Message object type is | |
114 | * CPC_MSG_TYPE_CAN_FRAME or CPC_MSG_TYPE_RTR_FRAME or | |
115 | * CPC_MSG_TYPE_EXT_CAN_FRAME or CPC_MSG_TYPE_EXT_RTR_FRAME. | |
116 | */ | |
117 | struct cpc_can_msg { | |
8a4b5b0f | 118 | __le32 id; |
702171ad SH |
119 | u8 length; |
120 | u8 msg[8]; | |
121 | }; | |
122 | ||
123 | /* Representation of the CAN parameters for the SJA1000 controller */ | |
124 | struct cpc_sja1000_params { | |
125 | u8 mode; | |
126 | u8 acc_code0; | |
127 | u8 acc_code1; | |
128 | u8 acc_code2; | |
129 | u8 acc_code3; | |
130 | u8 acc_mask0; | |
131 | u8 acc_mask1; | |
132 | u8 acc_mask2; | |
133 | u8 acc_mask3; | |
134 | u8 btr0; | |
135 | u8 btr1; | |
136 | u8 outp_contr; | |
137 | }; | |
138 | ||
139 | /* CAN params message representation */ | |
140 | struct cpc_can_params { | |
141 | u8 cc_type; | |
142 | ||
143 | /* Will support M16C CAN controller in the future */ | |
144 | union { | |
145 | struct cpc_sja1000_params sja1000; | |
146 | } cc_params; | |
147 | }; | |
148 | ||
149 | /* Structure for confirmed message handling */ | |
150 | struct cpc_confirm { | |
151 | u8 error; /* error code */ | |
152 | }; | |
153 | ||
154 | /* Structure for overrun conditions */ | |
155 | struct cpc_overrun { | |
156 | u8 event; | |
157 | u8 count; | |
158 | }; | |
159 | ||
160 | /* SJA1000 CAN errors (compatible to NXP LPC2119) */ | |
161 | struct cpc_sja1000_can_error { | |
162 | u8 ecc; | |
163 | u8 rxerr; | |
164 | u8 txerr; | |
165 | }; | |
166 | ||
167 | /* structure for CAN error conditions */ | |
168 | struct cpc_can_error { | |
169 | u8 ecode; | |
170 | ||
171 | struct { | |
172 | u8 cc_type; | |
173 | ||
174 | /* Other controllers may also provide error code capture regs */ | |
175 | union { | |
176 | struct cpc_sja1000_can_error sja1000; | |
177 | } regs; | |
178 | } cc; | |
179 | }; | |
180 | ||
181 | /* | |
182 | * Structure containing RX/TX error counter. This structure is used to request | |
183 | * the values of the CAN controllers TX and RX error counter. | |
184 | */ | |
185 | struct cpc_can_err_counter { | |
186 | u8 rx; | |
187 | u8 tx; | |
188 | }; | |
189 | ||
190 | /* Main message type used between library and application */ | |
ba2d3587 | 191 | struct __packed ems_cpc_msg { |
702171ad SH |
192 | u8 type; /* type of message */ |
193 | u8 length; /* length of data within union 'msg' */ | |
194 | u8 msgid; /* confirmation handle */ | |
a0bc163a MKB |
195 | __le32 ts_sec; /* timestamp in seconds */ |
196 | __le32 ts_nsec; /* timestamp in nano seconds */ | |
702171ad | 197 | |
a4cb6e62 | 198 | union __packed { |
702171ad SH |
199 | u8 generic[64]; |
200 | struct cpc_can_msg can_msg; | |
201 | struct cpc_can_params can_params; | |
202 | struct cpc_confirm confirmation; | |
203 | struct cpc_overrun overrun; | |
204 | struct cpc_can_error error; | |
205 | struct cpc_can_err_counter err_counter; | |
206 | u8 can_state; | |
207 | } msg; | |
208 | }; | |
209 | ||
210 | /* | |
211 | * Table of devices that work with this driver | |
212 | * NOTE: This driver supports only CPC-USB/ARM7 (LPC2119) yet. | |
213 | */ | |
214 | static struct usb_device_id ems_usb_table[] = { | |
215 | {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)}, | |
216 | {} /* Terminating entry */ | |
217 | }; | |
218 | ||
219 | MODULE_DEVICE_TABLE(usb, ems_usb_table); | |
220 | ||
221 | #define RX_BUFFER_SIZE 64 | |
222 | #define CPC_HEADER_SIZE 4 | |
223 | #define INTR_IN_BUFFER_SIZE 4 | |
224 | ||
225 | #define MAX_RX_URBS 10 | |
a6e4bc53 | 226 | #define MAX_TX_URBS 10 |
702171ad SH |
227 | |
228 | struct ems_usb; | |
229 | ||
230 | struct ems_tx_urb_context { | |
231 | struct ems_usb *dev; | |
232 | ||
233 | u32 echo_index; | |
702171ad SH |
234 | }; |
235 | ||
236 | struct ems_usb { | |
237 | struct can_priv can; /* must be the first member */ | |
702171ad SH |
238 | |
239 | struct sk_buff *echo_skb[MAX_TX_URBS]; | |
240 | ||
241 | struct usb_device *udev; | |
242 | struct net_device *netdev; | |
243 | ||
244 | atomic_t active_tx_urbs; | |
245 | struct usb_anchor tx_submitted; | |
246 | struct ems_tx_urb_context tx_contexts[MAX_TX_URBS]; | |
247 | ||
248 | struct usb_anchor rx_submitted; | |
249 | ||
250 | struct urb *intr_urb; | |
251 | ||
252 | u8 *tx_msg_buffer; | |
253 | ||
254 | u8 *intr_in_buffer; | |
255 | unsigned int free_slots; /* remember number of available slots */ | |
256 | ||
257 | struct ems_cpc_msg active_params; /* active controller parameters */ | |
9969e3c5 PS |
258 | void *rxbuf[MAX_RX_URBS]; |
259 | dma_addr_t rxbuf_dma[MAX_RX_URBS]; | |
702171ad SH |
260 | }; |
261 | ||
262 | static void ems_usb_read_interrupt_callback(struct urb *urb) | |
263 | { | |
264 | struct ems_usb *dev = urb->context; | |
265 | struct net_device *netdev = dev->netdev; | |
266 | int err; | |
267 | ||
268 | if (!netif_device_present(netdev)) | |
269 | return; | |
270 | ||
271 | switch (urb->status) { | |
272 | case 0: | |
273 | dev->free_slots = dev->intr_in_buffer[1]; | |
59097ac9 MKB |
274 | if (dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH && |
275 | netif_queue_stopped(netdev)) | |
276 | netif_wake_queue(netdev); | |
702171ad SH |
277 | break; |
278 | ||
279 | case -ECONNRESET: /* unlink */ | |
280 | case -ENOENT: | |
bd352e1a MK |
281 | case -EPIPE: |
282 | case -EPROTO: | |
702171ad SH |
283 | case -ESHUTDOWN: |
284 | return; | |
285 | ||
286 | default: | |
aabdfd6a | 287 | netdev_info(netdev, "Rx interrupt aborted %d\n", urb->status); |
702171ad SH |
288 | break; |
289 | } | |
290 | ||
291 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
292 | ||
293 | if (err == -ENODEV) | |
294 | netif_device_detach(netdev); | |
295 | else if (err) | |
aabdfd6a | 296 | netdev_err(netdev, "failed resubmitting intr urb: %d\n", err); |
702171ad SH |
297 | } |
298 | ||
299 | static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
300 | { | |
301 | struct can_frame *cf; | |
302 | struct sk_buff *skb; | |
303 | int i; | |
304 | struct net_device_stats *stats = &dev->netdev->stats; | |
305 | ||
7b6856a0 | 306 | skb = alloc_can_skb(dev->netdev, &cf); |
702171ad SH |
307 | if (skb == NULL) |
308 | return; | |
309 | ||
2b2072e9 | 310 | cf->can_id = le32_to_cpu(msg->msg.can_msg.id); |
c7b74967 | 311 | cf->len = can_cc_dlc2len(msg->msg.can_msg.length & 0xF); |
702171ad | 312 | |
8e95a202 JP |
313 | if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME || |
314 | msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) | |
702171ad SH |
315 | cf->can_id |= CAN_EFF_FLAG; |
316 | ||
8e95a202 JP |
317 | if (msg->type == CPC_MSG_TYPE_RTR_FRAME || |
318 | msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) { | |
702171ad SH |
319 | cf->can_id |= CAN_RTR_FLAG; |
320 | } else { | |
c7b74967 | 321 | for (i = 0; i < cf->len; i++) |
702171ad | 322 | cf->data[i] = msg->msg.can_msg.msg[i]; |
702171ad | 323 | |
8e674ca7 VM |
324 | stats->rx_bytes += cf->len; |
325 | } | |
702171ad | 326 | stats->rx_packets++; |
8e674ca7 | 327 | |
43c021e8 | 328 | netif_rx(skb); |
702171ad SH |
329 | } |
330 | ||
331 | static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
332 | { | |
333 | struct can_frame *cf; | |
334 | struct sk_buff *skb; | |
335 | struct net_device_stats *stats = &dev->netdev->stats; | |
336 | ||
7b6856a0 | 337 | skb = alloc_can_err_skb(dev->netdev, &cf); |
702171ad SH |
338 | if (skb == NULL) |
339 | return; | |
340 | ||
702171ad SH |
341 | if (msg->type == CPC_MSG_TYPE_CAN_STATE) { |
342 | u8 state = msg->msg.can_state; | |
343 | ||
344 | if (state & SJA1000_SR_BS) { | |
345 | dev->can.state = CAN_STATE_BUS_OFF; | |
346 | cf->can_id |= CAN_ERR_BUSOFF; | |
347 | ||
be38a6f9 | 348 | dev->can.can_stats.bus_off++; |
702171ad SH |
349 | can_bus_off(dev->netdev); |
350 | } else if (state & SJA1000_SR_ES) { | |
351 | dev->can.state = CAN_STATE_ERROR_WARNING; | |
352 | dev->can.can_stats.error_warning++; | |
353 | } else { | |
354 | dev->can.state = CAN_STATE_ERROR_ACTIVE; | |
355 | dev->can.can_stats.error_passive++; | |
356 | } | |
357 | } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) { | |
358 | u8 ecc = msg->msg.error.cc.regs.sja1000.ecc; | |
359 | u8 txerr = msg->msg.error.cc.regs.sja1000.txerr; | |
360 | u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr; | |
361 | ||
362 | /* bus error interrupt */ | |
363 | dev->can.can_stats.bus_error++; | |
364 | stats->rx_errors++; | |
365 | ||
366 | cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; | |
367 | ||
368 | switch (ecc & SJA1000_ECC_MASK) { | |
369 | case SJA1000_ECC_BIT: | |
370 | cf->data[2] |= CAN_ERR_PROT_BIT; | |
371 | break; | |
372 | case SJA1000_ECC_FORM: | |
373 | cf->data[2] |= CAN_ERR_PROT_FORM; | |
374 | break; | |
375 | case SJA1000_ECC_STUFF: | |
376 | cf->data[2] |= CAN_ERR_PROT_STUFF; | |
377 | break; | |
378 | default: | |
702171ad SH |
379 | cf->data[3] = ecc & SJA1000_ECC_SEG; |
380 | break; | |
381 | } | |
382 | ||
25985edc | 383 | /* Error occurred during transmission? */ |
702171ad SH |
384 | if ((ecc & SJA1000_ECC_DIR) == 0) |
385 | cf->data[2] |= CAN_ERR_PROT_TX; | |
386 | ||
387 | if (dev->can.state == CAN_STATE_ERROR_WARNING || | |
388 | dev->can.state == CAN_STATE_ERROR_PASSIVE) { | |
6ebc5e8f | 389 | cf->can_id |= CAN_ERR_CRTL; |
702171ad SH |
390 | cf->data[1] = (txerr > rxerr) ? |
391 | CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE; | |
392 | } | |
393 | } else if (msg->type == CPC_MSG_TYPE_OVERRUN) { | |
394 | cf->can_id |= CAN_ERR_CRTL; | |
395 | cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; | |
396 | ||
397 | stats->rx_over_errors++; | |
398 | stats->rx_errors++; | |
399 | } | |
400 | ||
43c021e8 | 401 | netif_rx(skb); |
702171ad SH |
402 | } |
403 | ||
404 | /* | |
405 | * callback for bulk IN urb | |
406 | */ | |
407 | static void ems_usb_read_bulk_callback(struct urb *urb) | |
408 | { | |
409 | struct ems_usb *dev = urb->context; | |
410 | struct net_device *netdev; | |
411 | int retval; | |
412 | ||
413 | netdev = dev->netdev; | |
414 | ||
415 | if (!netif_device_present(netdev)) | |
416 | return; | |
417 | ||
418 | switch (urb->status) { | |
419 | case 0: /* success */ | |
420 | break; | |
421 | ||
422 | case -ENOENT: | |
423 | return; | |
424 | ||
425 | default: | |
aabdfd6a | 426 | netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status); |
702171ad SH |
427 | goto resubmit_urb; |
428 | } | |
429 | ||
430 | if (urb->actual_length > CPC_HEADER_SIZE) { | |
431 | struct ems_cpc_msg *msg; | |
432 | u8 *ibuf = urb->transfer_buffer; | |
4e2061b1 | 433 | u8 msg_count, start; |
702171ad SH |
434 | |
435 | msg_count = ibuf[0] & ~0x80; | |
702171ad SH |
436 | |
437 | start = CPC_HEADER_SIZE; | |
438 | ||
439 | while (msg_count) { | |
440 | msg = (struct ems_cpc_msg *)&ibuf[start]; | |
441 | ||
442 | switch (msg->type) { | |
443 | case CPC_MSG_TYPE_CAN_STATE: | |
444 | /* Process CAN state changes */ | |
445 | ems_usb_rx_err(dev, msg); | |
446 | break; | |
447 | ||
448 | case CPC_MSG_TYPE_CAN_FRAME: | |
449 | case CPC_MSG_TYPE_EXT_CAN_FRAME: | |
450 | case CPC_MSG_TYPE_RTR_FRAME: | |
451 | case CPC_MSG_TYPE_EXT_RTR_FRAME: | |
452 | ems_usb_rx_can_msg(dev, msg); | |
453 | break; | |
454 | ||
455 | case CPC_MSG_TYPE_CAN_FRAME_ERROR: | |
456 | /* Process errorframe */ | |
457 | ems_usb_rx_err(dev, msg); | |
458 | break; | |
459 | ||
460 | case CPC_MSG_TYPE_OVERRUN: | |
461 | /* Message lost while receiving */ | |
462 | ems_usb_rx_err(dev, msg); | |
463 | break; | |
464 | } | |
465 | ||
466 | start += CPC_MSG_HEADER_LEN + msg->length; | |
467 | msg_count--; | |
468 | ||
469 | if (start > urb->transfer_buffer_length) { | |
aabdfd6a | 470 | netdev_err(netdev, "format error\n"); |
702171ad SH |
471 | break; |
472 | } | |
473 | } | |
474 | } | |
475 | ||
476 | resubmit_urb: | |
477 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), | |
478 | urb->transfer_buffer, RX_BUFFER_SIZE, | |
479 | ems_usb_read_bulk_callback, dev); | |
480 | ||
481 | retval = usb_submit_urb(urb, GFP_ATOMIC); | |
482 | ||
483 | if (retval == -ENODEV) | |
484 | netif_device_detach(netdev); | |
485 | else if (retval) | |
aabdfd6a WG |
486 | netdev_err(netdev, |
487 | "failed resubmitting read bulk urb: %d\n", retval); | |
702171ad SH |
488 | } |
489 | ||
490 | /* | |
491 | * callback for bulk IN urb | |
492 | */ | |
493 | static void ems_usb_write_bulk_callback(struct urb *urb) | |
494 | { | |
495 | struct ems_tx_urb_context *context = urb->context; | |
496 | struct ems_usb *dev; | |
497 | struct net_device *netdev; | |
498 | ||
499 | BUG_ON(!context); | |
500 | ||
501 | dev = context->dev; | |
502 | netdev = dev->netdev; | |
503 | ||
504 | /* free up our allocated buffer */ | |
997ea58e DM |
505 | usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
506 | urb->transfer_buffer, urb->transfer_dma); | |
702171ad SH |
507 | |
508 | atomic_dec(&dev->active_tx_urbs); | |
509 | ||
510 | if (!netif_device_present(netdev)) | |
511 | return; | |
512 | ||
513 | if (urb->status) | |
aabdfd6a | 514 | netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); |
702171ad | 515 | |
860e9538 | 516 | netif_trans_update(netdev); |
702171ad SH |
517 | |
518 | /* transmission complete interrupt */ | |
519 | netdev->stats.tx_packets++; | |
cc4b08c3 VM |
520 | netdev->stats.tx_bytes += can_get_echo_skb(netdev, context->echo_index, |
521 | NULL); | |
702171ad SH |
522 | |
523 | /* Release context */ | |
524 | context->echo_index = MAX_TX_URBS; | |
525 | ||
702171ad SH |
526 | } |
527 | ||
528 | /* | |
529 | * Send the given CPC command synchronously | |
530 | */ | |
531 | static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg) | |
532 | { | |
533 | int actual_length; | |
534 | ||
535 | /* Copy payload */ | |
536 | memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg, | |
537 | msg->length + CPC_MSG_HEADER_LEN); | |
538 | ||
539 | /* Clear header */ | |
540 | memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE); | |
541 | ||
542 | return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2), | |
543 | &dev->tx_msg_buffer[0], | |
544 | msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE, | |
545 | &actual_length, 1000); | |
546 | } | |
547 | ||
548 | /* | |
549 | * Change CAN controllers' mode register | |
550 | */ | |
551 | static int ems_usb_write_mode(struct ems_usb *dev, u8 mode) | |
552 | { | |
553 | dev->active_params.msg.can_params.cc_params.sja1000.mode = mode; | |
554 | ||
555 | return ems_usb_command_msg(dev, &dev->active_params); | |
556 | } | |
557 | ||
558 | /* | |
559 | * Send a CPC_Control command to change behaviour when interface receives a CAN | |
560 | * message, bus error or CAN state changed notifications. | |
561 | */ | |
562 | static int ems_usb_control_cmd(struct ems_usb *dev, u8 val) | |
563 | { | |
564 | struct ems_cpc_msg cmd; | |
565 | ||
566 | cmd.type = CPC_CMD_TYPE_CONTROL; | |
567 | cmd.length = CPC_MSG_HEADER_LEN + 1; | |
568 | ||
569 | cmd.msgid = 0; | |
570 | ||
571 | cmd.msg.generic[0] = val; | |
572 | ||
573 | return ems_usb_command_msg(dev, &cmd); | |
574 | } | |
575 | ||
576 | /* | |
577 | * Start interface | |
578 | */ | |
579 | static int ems_usb_start(struct ems_usb *dev) | |
580 | { | |
581 | struct net_device *netdev = dev->netdev; | |
582 | int err, i; | |
583 | ||
584 | dev->intr_in_buffer[0] = 0; | |
90cfde46 | 585 | dev->free_slots = 50; /* initial size */ |
702171ad SH |
586 | |
587 | for (i = 0; i < MAX_RX_URBS; i++) { | |
588 | struct urb *urb = NULL; | |
589 | u8 *buf = NULL; | |
9969e3c5 | 590 | dma_addr_t buf_dma; |
702171ad SH |
591 | |
592 | /* create a URB, and a buffer for it */ | |
593 | urb = usb_alloc_urb(0, GFP_KERNEL); | |
594 | if (!urb) { | |
2ee6850c SH |
595 | err = -ENOMEM; |
596 | break; | |
702171ad SH |
597 | } |
598 | ||
997ea58e | 599 | buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL, |
9969e3c5 | 600 | &buf_dma); |
702171ad | 601 | if (!buf) { |
aabdfd6a | 602 | netdev_err(netdev, "No memory left for USB buffer\n"); |
702171ad | 603 | usb_free_urb(urb); |
2ee6850c SH |
604 | err = -ENOMEM; |
605 | break; | |
702171ad SH |
606 | } |
607 | ||
9969e3c5 PS |
608 | urb->transfer_dma = buf_dma; |
609 | ||
702171ad SH |
610 | usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2), |
611 | buf, RX_BUFFER_SIZE, | |
612 | ems_usb_read_bulk_callback, dev); | |
613 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
614 | usb_anchor_urb(urb, &dev->rx_submitted); | |
615 | ||
616 | err = usb_submit_urb(urb, GFP_KERNEL); | |
617 | if (err) { | |
702171ad | 618 | usb_unanchor_urb(urb); |
997ea58e DM |
619 | usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, |
620 | urb->transfer_dma); | |
a1c31f1d | 621 | usb_free_urb(urb); |
702171ad SH |
622 | break; |
623 | } | |
624 | ||
9969e3c5 PS |
625 | dev->rxbuf[i] = buf; |
626 | dev->rxbuf_dma[i] = buf_dma; | |
627 | ||
702171ad SH |
628 | /* Drop reference, USB core will take care of freeing it */ |
629 | usb_free_urb(urb); | |
630 | } | |
631 | ||
632 | /* Did we submit any URBs */ | |
633 | if (i == 0) { | |
aabdfd6a | 634 | netdev_warn(netdev, "couldn't setup read URBs\n"); |
702171ad SH |
635 | return err; |
636 | } | |
637 | ||
638 | /* Warn if we've couldn't transmit all the URBs */ | |
639 | if (i < MAX_RX_URBS) | |
aabdfd6a | 640 | netdev_warn(netdev, "rx performance may be slow\n"); |
702171ad SH |
641 | |
642 | /* Setup and start interrupt URB */ | |
643 | usb_fill_int_urb(dev->intr_urb, dev->udev, | |
644 | usb_rcvintpipe(dev->udev, 1), | |
645 | dev->intr_in_buffer, | |
646 | INTR_IN_BUFFER_SIZE, | |
647 | ems_usb_read_interrupt_callback, dev, 1); | |
648 | ||
649 | err = usb_submit_urb(dev->intr_urb, GFP_KERNEL); | |
650 | if (err) { | |
aabdfd6a | 651 | netdev_warn(netdev, "intr URB submit failed: %d\n", err); |
702171ad SH |
652 | |
653 | return err; | |
654 | } | |
655 | ||
656 | /* CPC-USB will transfer received message to host */ | |
657 | err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON); | |
658 | if (err) | |
659 | goto failed; | |
660 | ||
661 | /* CPC-USB will transfer CAN state changes to host */ | |
662 | err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON); | |
663 | if (err) | |
664 | goto failed; | |
665 | ||
666 | /* CPC-USB will transfer bus errors to host */ | |
667 | err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON); | |
668 | if (err) | |
669 | goto failed; | |
670 | ||
671 | err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL); | |
672 | if (err) | |
673 | goto failed; | |
674 | ||
675 | dev->can.state = CAN_STATE_ERROR_ACTIVE; | |
676 | ||
677 | return 0; | |
678 | ||
679 | failed: | |
aabdfd6a | 680 | netdev_warn(netdev, "couldn't submit control: %d\n", err); |
702171ad SH |
681 | |
682 | return err; | |
683 | } | |
684 | ||
685 | static void unlink_all_urbs(struct ems_usb *dev) | |
686 | { | |
687 | int i; | |
688 | ||
689 | usb_unlink_urb(dev->intr_urb); | |
690 | ||
691 | usb_kill_anchored_urbs(&dev->rx_submitted); | |
692 | ||
9969e3c5 PS |
693 | for (i = 0; i < MAX_RX_URBS; ++i) |
694 | usb_free_coherent(dev->udev, RX_BUFFER_SIZE, | |
695 | dev->rxbuf[i], dev->rxbuf_dma[i]); | |
696 | ||
702171ad SH |
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 | ||
ae64438b | 750 | if (can_dev_dropped_skb(netdev, skb)) |
3ccd4c61 OH |
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); | |
87ced2f9 | 755 | if (!urb) |
702171ad | 756 | goto nomem; |
702171ad | 757 | |
997ea58e | 758 | buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma); |
702171ad | 759 | if (!buf) { |
aabdfd6a | 760 | netdev_err(netdev, "No memory left for USB buffer\n"); |
702171ad SH |
761 | usb_free_urb(urb); |
762 | goto nomem; | |
763 | } | |
764 | ||
765 | msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE]; | |
766 | ||
8a4b5b0f | 767 | msg->msg.can_msg.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); |
c7b74967 | 768 | msg->msg.can_msg.length = cf->len; |
702171ad SH |
769 | |
770 | if (cf->can_id & CAN_RTR_FLAG) { | |
771 | msg->type = cf->can_id & CAN_EFF_FLAG ? | |
772 | CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME; | |
773 | ||
774 | msg->length = CPC_CAN_MSG_MIN_SIZE; | |
775 | } else { | |
776 | msg->type = cf->can_id & CAN_EFF_FLAG ? | |
777 | CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME; | |
778 | ||
c7b74967 | 779 | for (i = 0; i < cf->len; i++) |
702171ad SH |
780 | msg->msg.can_msg.msg[i] = cf->data[i]; |
781 | ||
c7b74967 | 782 | msg->length = CPC_CAN_MSG_MIN_SIZE + cf->len; |
702171ad SH |
783 | } |
784 | ||
785 | for (i = 0; i < MAX_TX_URBS; i++) { | |
786 | if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) { | |
787 | context = &dev->tx_contexts[i]; | |
788 | break; | |
789 | } | |
790 | } | |
791 | ||
792 | /* | |
793 | * May never happen! When this happens we'd more URBs in flight as | |
794 | * allowed (MAX_TX_URBS). | |
795 | */ | |
796 | if (!context) { | |
997ea58e | 797 | usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
a1c31f1d | 798 | usb_free_urb(urb); |
702171ad | 799 | |
aabdfd6a | 800 | netdev_warn(netdev, "couldn't find free context\n"); |
702171ad SH |
801 | |
802 | return NETDEV_TX_BUSY; | |
803 | } | |
804 | ||
805 | context->dev = dev; | |
806 | context->echo_index = i; | |
702171ad SH |
807 | |
808 | usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, | |
809 | size, ems_usb_write_bulk_callback, context); | |
810 | urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; | |
811 | usb_anchor_urb(urb, &dev->tx_submitted); | |
812 | ||
1dcb6e57 | 813 | can_put_echo_skb(skb, netdev, context->echo_index, 0); |
702171ad SH |
814 | |
815 | atomic_inc(&dev->active_tx_urbs); | |
816 | ||
817 | err = usb_submit_urb(urb, GFP_ATOMIC); | |
818 | if (unlikely(err)) { | |
f318482a | 819 | can_free_echo_skb(netdev, context->echo_index, NULL); |
702171ad SH |
820 | |
821 | usb_unanchor_urb(urb); | |
997ea58e | 822 | usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
702171ad SH |
823 | |
824 | atomic_dec(&dev->active_tx_urbs); | |
825 | ||
826 | if (err == -ENODEV) { | |
827 | netif_device_detach(netdev); | |
828 | } else { | |
aabdfd6a | 829 | netdev_warn(netdev, "failed tx_urb %d\n", err); |
702171ad SH |
830 | |
831 | stats->tx_dropped++; | |
832 | } | |
833 | } else { | |
860e9538 | 834 | netif_trans_update(netdev); |
702171ad SH |
835 | |
836 | /* Slow down tx path */ | |
837 | if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS || | |
90cfde46 | 838 | dev->free_slots < CPC_TX_QUEUE_TRIGGER_LOW) { |
702171ad SH |
839 | netif_stop_queue(netdev); |
840 | } | |
841 | } | |
842 | ||
843 | /* | |
844 | * Release our reference to this URB, the USB core will eventually free | |
845 | * it entirely. | |
846 | */ | |
847 | usb_free_urb(urb); | |
848 | ||
849 | return NETDEV_TX_OK; | |
850 | ||
851 | nomem: | |
ea3fb371 | 852 | dev_kfree_skb(skb); |
702171ad SH |
853 | stats->tx_dropped++; |
854 | ||
855 | return NETDEV_TX_OK; | |
856 | } | |
857 | ||
858 | static int ems_usb_close(struct net_device *netdev) | |
859 | { | |
860 | struct ems_usb *dev = netdev_priv(netdev); | |
861 | ||
862 | /* Stop polling */ | |
863 | unlink_all_urbs(dev); | |
864 | ||
865 | netif_stop_queue(netdev); | |
866 | ||
867 | /* Set CAN controller to reset mode */ | |
868 | if (ems_usb_write_mode(dev, SJA1000_MOD_RM)) | |
aabdfd6a | 869 | netdev_warn(netdev, "couldn't stop device"); |
702171ad SH |
870 | |
871 | close_candev(netdev); | |
872 | ||
702171ad SH |
873 | return 0; |
874 | } | |
875 | ||
876 | static const struct net_device_ops ems_usb_netdev_ops = { | |
877 | .ndo_open = ems_usb_open, | |
878 | .ndo_stop = ems_usb_close, | |
879 | .ndo_start_xmit = ems_usb_start_xmit, | |
c971fa2a | 880 | .ndo_change_mtu = can_change_mtu, |
702171ad SH |
881 | }; |
882 | ||
409c188c VM |
883 | static const struct ethtool_ops ems_usb_ethtool_ops = { |
884 | .get_ts_info = ethtool_op_get_ts_info, | |
885 | }; | |
886 | ||
194b9a4c | 887 | static const struct can_bittiming_const ems_usb_bittiming_const = { |
f60df831 | 888 | .name = KBUILD_MODNAME, |
702171ad SH |
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 | 997 | netdev->netdev_ops = &ems_usb_netdev_ops; |
409c188c | 998 | netdev->ethtool_ops = &ems_usb_ethtool_ops; |
702171ad SH |
999 | |
1000 | netdev->flags |= IFF_ECHO; /* we support local echo */ | |
1001 | ||
1002 | init_usb_anchor(&dev->rx_submitted); | |
1003 | ||
1004 | init_usb_anchor(&dev->tx_submitted); | |
1005 | atomic_set(&dev->active_tx_urbs, 0); | |
1006 | ||
1007 | for (i = 0; i < MAX_TX_URBS; i++) | |
1008 | dev->tx_contexts[i].echo_index = MAX_TX_URBS; | |
1009 | ||
1010 | dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL); | |
87ced2f9 | 1011 | if (!dev->intr_urb) |
702171ad | 1012 | goto cleanup_candev; |
702171ad SH |
1013 | |
1014 | dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL); | |
09da6c5f | 1015 | if (!dev->intr_in_buffer) |
702171ad | 1016 | goto cleanup_intr_urb; |
702171ad SH |
1017 | |
1018 | dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE + | |
1019 | sizeof(struct ems_cpc_msg), GFP_KERNEL); | |
14f8dc49 | 1020 | if (!dev->tx_msg_buffer) |
702171ad | 1021 | goto cleanup_intr_in_buffer; |
702171ad SH |
1022 | |
1023 | usb_set_intfdata(intf, dev); | |
1024 | ||
1025 | SET_NETDEV_DEV(netdev, &intf->dev); | |
1026 | ||
1027 | init_params_sja1000(&dev->active_params); | |
1028 | ||
1029 | err = ems_usb_command_msg(dev, &dev->active_params); | |
1030 | if (err) { | |
aabdfd6a | 1031 | netdev_err(netdev, "couldn't initialize controller: %d\n", err); |
702171ad SH |
1032 | goto cleanup_tx_msg_buffer; |
1033 | } | |
1034 | ||
1035 | err = register_candev(netdev); | |
1036 | if (err) { | |
aabdfd6a | 1037 | netdev_err(netdev, "couldn't register CAN device: %d\n", err); |
702171ad SH |
1038 | goto cleanup_tx_msg_buffer; |
1039 | } | |
1040 | ||
1041 | return 0; | |
1042 | ||
1043 | cleanup_tx_msg_buffer: | |
1044 | kfree(dev->tx_msg_buffer); | |
1045 | ||
1046 | cleanup_intr_in_buffer: | |
1047 | kfree(dev->intr_in_buffer); | |
1048 | ||
1049 | cleanup_intr_urb: | |
1050 | usb_free_urb(dev->intr_urb); | |
1051 | ||
1052 | cleanup_candev: | |
1053 | free_candev(netdev); | |
1054 | ||
1055 | return err; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * called by the usb core when the device is removed from the system | |
1060 | */ | |
1061 | static void ems_usb_disconnect(struct usb_interface *intf) | |
1062 | { | |
1063 | struct ems_usb *dev = usb_get_intfdata(intf); | |
1064 | ||
1065 | usb_set_intfdata(intf, NULL); | |
1066 | ||
1067 | if (dev) { | |
1068 | unregister_netdev(dev->netdev); | |
702171ad SH |
1069 | |
1070 | unlink_all_urbs(dev); | |
1071 | ||
1072 | usb_free_urb(dev->intr_urb); | |
1073 | ||
1074 | kfree(dev->intr_in_buffer); | |
72c05f32 | 1075 | kfree(dev->tx_msg_buffer); |
ab4a0b8f PS |
1076 | |
1077 | free_candev(dev->netdev); | |
702171ad SH |
1078 | } |
1079 | } | |
1080 | ||
1081 | /* usb specific object needed to register this driver with the usb subsystem */ | |
1082 | static struct usb_driver ems_usb_driver = { | |
f60df831 | 1083 | .name = KBUILD_MODNAME, |
702171ad SH |
1084 | .probe = ems_usb_probe, |
1085 | .disconnect = ems_usb_disconnect, | |
1086 | .id_table = ems_usb_table, | |
1087 | }; | |
1088 | ||
d632eb1b | 1089 | module_usb_driver(ems_usb_driver); |