]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - drivers/net/can/usb/ems_usb.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branches 'battery-scope', 'logitech' and 'multitouch' into for-linus
[mirror_ubuntu-artful-kernel.git] / drivers / net / can / usb / ems_usb.c
CommitLineData
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
30MODULE_AUTHOR("Sebastian Haas <haas@ems-wuensche.com>");
31MODULE_DESCRIPTION("CAN driver for EMS Dr. Thomas Wuensche CAN/USB interfaces");
32MODULE_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 */
126struct 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 */
133struct 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 */
149struct 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 */
159struct cpc_confirm {
160 u8 error; /* error code */
161};
162
163/* Structure for overrun conditions */
164struct cpc_overrun {
165 u8 event;
166 u8 count;
167};
168
169/* SJA1000 CAN errors (compatible to NXP LPC2119) */
170struct cpc_sja1000_can_error {
171 u8 ecc;
172 u8 rxerr;
173 u8 txerr;
174};
175
176/* structure for CAN error conditions */
177struct 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 */
194struct cpc_can_err_counter {
195 u8 rx;
196 u8 tx;
197};
198
199/* Main message type used between library and application */
ba2d3587 200struct __packed ems_cpc_msg {
702171ad
SH		 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 */
223static struct usb_device_id ems_usb_table[] = {
224 {USB_DEVICE(USB_CPCUSB_VENDOR_ID, USB_CPCUSB_ARM7_PRODUCT_ID)},
225 {} /* Terminating entry */
226};
227
228MODULE_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
237struct ems_usb;
238
239struct ems_tx_urb_context {
240 struct ems_usb *dev;
241
242 u32 echo_index;
243 u8 dlc;
244};
245
246struct 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
271static 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);
702171ad
SH		 303}
304
305static void ems_usb_rx_can_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
306{
307 struct can_frame *cf;
308 struct sk_buff *skb;
309 int i;
310 struct net_device_stats *stats = &dev->netdev->stats;
311
7b6856a0 312 skb = alloc_can_skb(dev->netdev, &cf);
702171ad
SH		 313 if (skb == NULL)
314 return;
315
2b2072e9 316 cf->can_id = le32_to_cpu(msg->msg.can_msg.id);
c7cd606f 317 cf->can_dlc = get_can_dlc(msg->msg.can_msg.length & 0xF);
702171ad 318
8e95a202
JP		 319 if (msg->type == CPC_MSG_TYPE_EXT_CAN_FRAME ||
320 msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME)
702171ad
SH		 321 cf->can_id |= CAN_EFF_FLAG;
322
8e95a202
JP		 323 if (msg->type == CPC_MSG_TYPE_RTR_FRAME ||
324 msg->type == CPC_MSG_TYPE_EXT_RTR_FRAME) {
702171ad
SH		 325 cf->can_id |= CAN_RTR_FLAG;
326 } else {
327 for (i = 0; i < cf->can_dlc; i++)
328 cf->data[i] = msg->msg.can_msg.msg[i];
329 }
330
331 netif_rx(skb);
332
333 stats->rx_packets++;
334 stats->rx_bytes += cf->can_dlc;
335}
336
337static void ems_usb_rx_err(struct ems_usb *dev, struct ems_cpc_msg *msg)
338{
339 struct can_frame *cf;
340 struct sk_buff *skb;
341 struct net_device_stats *stats = &dev->netdev->stats;
342
7b6856a0 343 skb = alloc_can_err_skb(dev->netdev, &cf);
702171ad
SH		 344 if (skb == NULL)
345 return;
346
702171ad
SH		 347 if (msg->type == CPC_MSG_TYPE_CAN_STATE) {
348 u8 state = msg->msg.can_state;
349
350 if (state & SJA1000_SR_BS) {
351 dev->can.state = CAN_STATE_BUS_OFF;
352 cf->can_id |= CAN_ERR_BUSOFF;
353
354 can_bus_off(dev->netdev);
355 } else if (state & SJA1000_SR_ES) {
356 dev->can.state = CAN_STATE_ERROR_WARNING;
357 dev->can.can_stats.error_warning++;
358 } else {
359 dev->can.state = CAN_STATE_ERROR_ACTIVE;
360 dev->can.can_stats.error_passive++;
361 }
362 } else if (msg->type == CPC_MSG_TYPE_CAN_FRAME_ERROR) {
363 u8 ecc = msg->msg.error.cc.regs.sja1000.ecc;
364 u8 txerr = msg->msg.error.cc.regs.sja1000.txerr;
365 u8 rxerr = msg->msg.error.cc.regs.sja1000.rxerr;
366
367 /* bus error interrupt */
368 dev->can.can_stats.bus_error++;
369 stats->rx_errors++;
370
371 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
372
373 switch (ecc & SJA1000_ECC_MASK) {
374 case SJA1000_ECC_BIT:
375 cf->data[2] |= CAN_ERR_PROT_BIT;
376 break;
377 case SJA1000_ECC_FORM:
378 cf->data[2] |= CAN_ERR_PROT_FORM;
379 break;
380 case SJA1000_ECC_STUFF:
381 cf->data[2] |= CAN_ERR_PROT_STUFF;
382 break;
383 default:
384 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
385 cf->data[3] = ecc & SJA1000_ECC_SEG;
386 break;
387 }
388
25985edc 389 /* Error occurred during transmission? */
702171ad
SH		 390 if ((ecc & SJA1000_ECC_DIR) == 0)
391 cf->data[2] |= CAN_ERR_PROT_TX;
392
393 if (dev->can.state == CAN_STATE_ERROR_WARNING ||
394 dev->can.state == CAN_STATE_ERROR_PASSIVE) {
395 cf->data[1] = (txerr > rxerr) ?
396 CAN_ERR_CRTL_TX_PASSIVE : CAN_ERR_CRTL_RX_PASSIVE;
397 }
398 } else if (msg->type == CPC_MSG_TYPE_OVERRUN) {
399 cf->can_id |= CAN_ERR_CRTL;
400 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
401
402 stats->rx_over_errors++;
403 stats->rx_errors++;
404 }
405
406 netif_rx(skb);
407
408 stats->rx_packets++;
409 stats->rx_bytes += cf->can_dlc;
410}
411
412/*
413 * callback for bulk IN urb
414 */
415static 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:
434 dev_info(netdev->dev.parent, "Rx URB aborted (%d)\n",
435 urb->status);
436 goto resubmit_urb;
437 }
438
439 if (urb->actual_length > CPC_HEADER_SIZE) {
440 struct ems_cpc_msg *msg;
441 u8 *ibuf = urb->transfer_buffer;
442 u8 msg_count, again, start;
443
444 msg_count = ibuf[0] & ~0x80;
445 again = ibuf[0] & 0x80;
446
447 start = CPC_HEADER_SIZE;
448
449 while (msg_count) {
450 msg = (struct ems_cpc_msg *)&ibuf[start];
451
452 switch (msg->type) {
453 case CPC_MSG_TYPE_CAN_STATE:
454 /* Process CAN state changes */
455 ems_usb_rx_err(dev, msg);
456 break;
457
458 case CPC_MSG_TYPE_CAN_FRAME:
459 case CPC_MSG_TYPE_EXT_CAN_FRAME:
460 case CPC_MSG_TYPE_RTR_FRAME:
461 case CPC_MSG_TYPE_EXT_RTR_FRAME:
462 ems_usb_rx_can_msg(dev, msg);
463 break;
464
465 case CPC_MSG_TYPE_CAN_FRAME_ERROR:
466 /* Process errorframe */
467 ems_usb_rx_err(dev, msg);
468 break;
469
470 case CPC_MSG_TYPE_OVERRUN:
471 /* Message lost while receiving */
472 ems_usb_rx_err(dev, msg);
473 break;
474 }
475
476 start += CPC_MSG_HEADER_LEN + msg->length;
477 msg_count--;
478
479 if (start > urb->transfer_buffer_length) {
480 dev_err(netdev->dev.parent, "format error\n");
481 break;
482 }
483 }
484 }
485
486resubmit_urb:
487 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
488 urb->transfer_buffer, RX_BUFFER_SIZE,
489 ems_usb_read_bulk_callback, dev);
490
491 retval = usb_submit_urb(urb, GFP_ATOMIC);
492
493 if (retval == -ENODEV)
494 netif_device_detach(netdev);
495 else if (retval)
496 dev_err(netdev->dev.parent,
497 "failed resubmitting read bulk urb: %d\n", retval);
702171ad
SH		 498}
499
500/*
501 * callback for bulk IN urb
502 */
503static void ems_usb_write_bulk_callback(struct urb *urb)
504{
505 struct ems_tx_urb_context *context = urb->context;
506 struct ems_usb *dev;
507 struct net_device *netdev;
508
509 BUG_ON(!context);
510
511 dev = context->dev;
512 netdev = dev->netdev;
513
514 /* free up our allocated buffer */
997ea58e
DM		 515 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
516 urb->transfer_buffer, urb->transfer_dma);
702171ad
SH		 517
518 atomic_dec(&dev->active_tx_urbs);
519
520 if (!netif_device_present(netdev))
521 return;
522
523 if (urb->status)
524 dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n",
525 urb->status);
526
527 netdev->trans_start = jiffies;
528
529 /* transmission complete interrupt */
530 netdev->stats.tx_packets++;
531 netdev->stats.tx_bytes += context->dlc;
532
533 can_get_echo_skb(netdev, context->echo_index);
534
535 /* Release context */
536 context->echo_index = MAX_TX_URBS;
537
538 if (netif_queue_stopped(netdev))
539 netif_wake_queue(netdev);
540}
541
542/*
543 * Send the given CPC command synchronously
544 */
545static int ems_usb_command_msg(struct ems_usb *dev, struct ems_cpc_msg *msg)
546{
547 int actual_length;
548
549 /* Copy payload */
550 memcpy(&dev->tx_msg_buffer[CPC_HEADER_SIZE], msg,
551 msg->length + CPC_MSG_HEADER_LEN);
552
553 /* Clear header */
554 memset(&dev->tx_msg_buffer[0], 0, CPC_HEADER_SIZE);
555
556 return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 2),
557 &dev->tx_msg_buffer[0],
558 msg->length + CPC_MSG_HEADER_LEN + CPC_HEADER_SIZE,
559 &actual_length, 1000);
560}
561
562/*
563 * Change CAN controllers' mode register
564 */
565static int ems_usb_write_mode(struct ems_usb *dev, u8 mode)
566{
567 dev->active_params.msg.can_params.cc_params.sja1000.mode = mode;
568
569 return ems_usb_command_msg(dev, &dev->active_params);
570}
571
572/*
573 * Send a CPC_Control command to change behaviour when interface receives a CAN
574 * message, bus error or CAN state changed notifications.
575 */
576static int ems_usb_control_cmd(struct ems_usb *dev, u8 val)
577{
578 struct ems_cpc_msg cmd;
579
580 cmd.type = CPC_CMD_TYPE_CONTROL;
581 cmd.length = CPC_MSG_HEADER_LEN + 1;
582
583 cmd.msgid = 0;
584
585 cmd.msg.generic[0] = val;
586
587 return ems_usb_command_msg(dev, &cmd);
588}
589
590/*
591 * Start interface
592 */
593static int ems_usb_start(struct ems_usb *dev)
594{
595 struct net_device *netdev = dev->netdev;
596 int err, i;
597
598 dev->intr_in_buffer[0] = 0;
599 dev->free_slots = 15; /* initial size */
600
601 for (i = 0; i < MAX_RX_URBS; i++) {
602 struct urb *urb = NULL;
603 u8 *buf = NULL;
604
605 /* create a URB, and a buffer for it */
606 urb = usb_alloc_urb(0, GFP_KERNEL);
607 if (!urb) {
608 dev_err(netdev->dev.parent,
609 "No memory left for URBs\n");
610 return -ENOMEM;
611 }
612
997ea58e
DM		 613 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
614 &urb->transfer_dma);
702171ad
SH		 615 if (!buf) {
616 dev_err(netdev->dev.parent,
617 "No memory left for USB buffer\n");
618 usb_free_urb(urb);
619 return -ENOMEM;
620 }
621
622 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 2),
623 buf, RX_BUFFER_SIZE,
624 ems_usb_read_bulk_callback, dev);
625 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
626 usb_anchor_urb(urb, &dev->rx_submitted);
627
628 err = usb_submit_urb(urb, GFP_KERNEL);
629 if (err) {
702171ad 630 usb_unanchor_urb(urb);
997ea58e
DM		 631 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
632 urb->transfer_dma);
702171ad
SH		 633 break;
634 }
635
636 /* Drop reference, USB core will take care of freeing it */
637 usb_free_urb(urb);
638 }
639
640 /* Did we submit any URBs */
641 if (i == 0) {
642 dev_warn(netdev->dev.parent, "couldn't setup read URBs\n");
643 return err;
644 }
645
646 /* Warn if we've couldn't transmit all the URBs */
647 if (i < MAX_RX_URBS)
648 dev_warn(netdev->dev.parent, "rx performance may be slow\n");
649
650 /* Setup and start interrupt URB */
651 usb_fill_int_urb(dev->intr_urb, dev->udev,
652 usb_rcvintpipe(dev->udev, 1),
653 dev->intr_in_buffer,
654 INTR_IN_BUFFER_SIZE,
655 ems_usb_read_interrupt_callback, dev, 1);
656
657 err = usb_submit_urb(dev->intr_urb, GFP_KERNEL);
658 if (err) {
702171ad
SH		 659 dev_warn(netdev->dev.parent, "intr URB submit failed: %d\n",
660 err);
661
662 return err;
663 }
664
665 /* CPC-USB will transfer received message to host */
666 err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON);
667 if (err)
668 goto failed;
669
670 /* CPC-USB will transfer CAN state changes to host */
671 err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON);
672 if (err)
673 goto failed;
674
675 /* CPC-USB will transfer bus errors to host */
676 err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON);
677 if (err)
678 goto failed;
679
680 err = ems_usb_write_mode(dev, SJA1000_MOD_NORMAL);
681 if (err)
682 goto failed;
683
684 dev->can.state = CAN_STATE_ERROR_ACTIVE;
685
686 return 0;
687
688failed:
702171ad
SH		 689 dev_warn(netdev->dev.parent, "couldn't submit control: %d\n", err);
690
691 return err;
692}
693
694static void unlink_all_urbs(struct ems_usb *dev)
695{
696 int i;
697
698 usb_unlink_urb(dev->intr_urb);
699
700 usb_kill_anchored_urbs(&dev->rx_submitted);
701
702 usb_kill_anchored_urbs(&dev->tx_submitted);
703 atomic_set(&dev->active_tx_urbs, 0);
704
705 for (i = 0; i < MAX_TX_URBS; i++)
706 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
707}
708
709static int ems_usb_open(struct net_device *netdev)
710{
711 struct ems_usb *dev = netdev_priv(netdev);
712 int err;
713
714 err = ems_usb_write_mode(dev, SJA1000_MOD_RM);
715 if (err)
716 return err;
717
718 /* common open */
719 err = open_candev(netdev);
720 if (err)
721 return err;
722
723 /* finally start device */
724 err = ems_usb_start(dev);
725 if (err) {
726 if (err == -ENODEV)
727 netif_device_detach(dev->netdev);
728
729 dev_warn(netdev->dev.parent, "couldn't start device: %d\n",
730 err);
731
732 close_candev(netdev);
733
734 return err;
735 }
736
737 dev->open_time = jiffies;
738
739 netif_start_queue(netdev);
740
741 return 0;
742}
743
744static netdev_tx_t ems_usb_start_xmit(struct sk_buff *skb, struct net_device *netdev)
745{
746 struct ems_usb *dev = netdev_priv(netdev);
747 struct ems_tx_urb_context *context = NULL;
748 struct net_device_stats *stats = &netdev->stats;
749 struct can_frame *cf = (struct can_frame *)skb->data;
750 struct ems_cpc_msg *msg;
751 struct urb *urb;
752 u8 *buf;
753 int i, err;
754 size_t size = CPC_HEADER_SIZE + CPC_MSG_HEADER_LEN
755 + sizeof(struct cpc_can_msg);
756
3ccd4c61
OH		 757 if (can_dropped_invalid_skb(netdev, skb))
758 return NETDEV_TX_OK;
759
702171ad
SH		 760 /* create a URB, and a buffer for it, and copy the data to the URB */
761 urb = usb_alloc_urb(0, GFP_ATOMIC);
762 if (!urb) {
763 dev_err(netdev->dev.parent, "No memory left for URBs\n");
764 goto nomem;
765 }
766
997ea58e 767 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma);
702171ad
SH		 768 if (!buf) {
769 dev_err(netdev->dev.parent, "No memory left for USB buffer\n");
770 usb_free_urb(urb);
771 goto nomem;
772 }
773
774 msg = (struct ems_cpc_msg *)&buf[CPC_HEADER_SIZE];
775
776 msg->msg.can_msg.id = cf->can_id & CAN_ERR_MASK;
777 msg->msg.can_msg.length = cf->can_dlc;
778
779 if (cf->can_id & CAN_RTR_FLAG) {
780 msg->type = cf->can_id & CAN_EFF_FLAG ?
781 CPC_CMD_TYPE_EXT_RTR_FRAME : CPC_CMD_TYPE_RTR_FRAME;
782
783 msg->length = CPC_CAN_MSG_MIN_SIZE;
784 } else {
785 msg->type = cf->can_id & CAN_EFF_FLAG ?
786 CPC_CMD_TYPE_EXT_CAN_FRAME : CPC_CMD_TYPE_CAN_FRAME;
787
788 for (i = 0; i < cf->can_dlc; i++)
789 msg->msg.can_msg.msg[i] = cf->data[i];
790
791 msg->length = CPC_CAN_MSG_MIN_SIZE + cf->can_dlc;
792 }
793
2b2072e9
SH		 794 /* Respect byte order */
795 msg->msg.can_msg.id = cpu_to_le32(msg->msg.can_msg.id);
796
702171ad
SH		 797 for (i = 0; i < MAX_TX_URBS; i++) {
798 if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
799 context = &dev->tx_contexts[i];
800 break;
801 }
802 }
803
804 /*
805 * May never happen! When this happens we'd more URBs in flight as
806 * allowed (MAX_TX_URBS).
807 */
808 if (!context) {
809 usb_unanchor_urb(urb);
997ea58e 810 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
702171ad
SH		 811
812 dev_warn(netdev->dev.parent, "couldn't find free context\n");
813
814 return NETDEV_TX_BUSY;
815 }
816
817 context->dev = dev;
818 context->echo_index = i;
819 context->dlc = cf->can_dlc;
820
821 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
822 size, ems_usb_write_bulk_callback, context);
823 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
824 usb_anchor_urb(urb, &dev->tx_submitted);
825
826 can_put_echo_skb(skb, netdev, context->echo_index);
827
828 atomic_inc(&dev->active_tx_urbs);
829
830 err = usb_submit_urb(urb, GFP_ATOMIC);
831 if (unlikely(err)) {
832 can_free_echo_skb(netdev, context->echo_index);
833
834 usb_unanchor_urb(urb);
997ea58e 835 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
702171ad
SH		 836 dev_kfree_skb(skb);
837
838 atomic_dec(&dev->active_tx_urbs);
839
840 if (err == -ENODEV) {
841 netif_device_detach(netdev);
842 } else {
843 dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err);
844
845 stats->tx_dropped++;
846 }
847 } else {
848 netdev->trans_start = jiffies;
849
850 /* Slow down tx path */
851 if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
852 dev->free_slots < 5) {
853 netif_stop_queue(netdev);
854 }
855 }
856
857 /*
858 * Release our reference to this URB, the USB core will eventually free
859 * it entirely.
860 */
861 usb_free_urb(urb);
862
863 return NETDEV_TX_OK;
864
865nomem:
ea3fb371 866 dev_kfree_skb(skb);
702171ad
SH		 867 stats->tx_dropped++;
868
869 return NETDEV_TX_OK;
870}
871
872static int ems_usb_close(struct net_device *netdev)
873{
874 struct ems_usb *dev = netdev_priv(netdev);
875
876 /* Stop polling */
877 unlink_all_urbs(dev);
878
879 netif_stop_queue(netdev);
880
881 /* Set CAN controller to reset mode */
882 if (ems_usb_write_mode(dev, SJA1000_MOD_RM))
883 dev_warn(netdev->dev.parent, "couldn't stop device");
884
885 close_candev(netdev);
886
887 dev->open_time = 0;
888
889 return 0;
890}
891
892static const struct net_device_ops ems_usb_netdev_ops = {
893 .ndo_open = ems_usb_open,
894 .ndo_stop = ems_usb_close,
895 .ndo_start_xmit = ems_usb_start_xmit,
896};
897
898static struct can_bittiming_const ems_usb_bittiming_const = {
899 .name = "ems_usb",
900 .tseg1_min = 1,
901 .tseg1_max = 16,
902 .tseg2_min = 1,
903 .tseg2_max = 8,
904 .sjw_max = 4,
905 .brp_min = 1,
906 .brp_max = 64,
907 .brp_inc = 1,
908};
909
910static int ems_usb_set_mode(struct net_device *netdev, enum can_mode mode)
911{
912 struct ems_usb *dev = netdev_priv(netdev);
913
914 if (!dev->open_time)
915 return -EINVAL;
916
917 switch (mode) {
918 case CAN_MODE_START:
919 if (ems_usb_write_mode(dev, SJA1000_MOD_NORMAL))
920 dev_warn(netdev->dev.parent, "couldn't start device");
921
922 if (netif_queue_stopped(netdev))
923 netif_wake_queue(netdev);
924 break;
925
926 default:
927 return -EOPNOTSUPP;
928 }
929
930 return 0;
931}
932
933static int ems_usb_set_bittiming(struct net_device *netdev)
934{
935 struct ems_usb *dev = netdev_priv(netdev);
936 struct can_bittiming *bt = &dev->can.bittiming;
937 u8 btr0, btr1;
938
939 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
940 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
941 (((bt->phase_seg2 - 1) & 0x7) << 4);
942 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
943 btr1 |= 0x80;
944
945 dev_info(netdev->dev.parent, "setting BTR0=0x%02x BTR1=0x%02x\n",
946 btr0, btr1);
947
948 dev->active_params.msg.can_params.cc_params.sja1000.btr0 = btr0;
949 dev->active_params.msg.can_params.cc_params.sja1000.btr1 = btr1;
950
951 return ems_usb_command_msg(dev, &dev->active_params);
952}
953
954static void init_params_sja1000(struct ems_cpc_msg *msg)
955{
956 struct cpc_sja1000_params *sja1000 =
957 &msg->msg.can_params.cc_params.sja1000;
958
959 msg->type = CPC_CMD_TYPE_CAN_PARAMS;
960 msg->length = sizeof(struct cpc_can_params);
961 msg->msgid = 0;
962
963 msg->msg.can_params.cc_type = CPC_CC_TYPE_SJA1000;
964
965 /* Acceptance filter open */
966 sja1000->acc_code0 = 0x00;
967 sja1000->acc_code1 = 0x00;
968 sja1000->acc_code2 = 0x00;
969 sja1000->acc_code3 = 0x00;
970
971 /* Acceptance filter open */
972 sja1000->acc_mask0 = 0xFF;
973 sja1000->acc_mask1 = 0xFF;
974 sja1000->acc_mask2 = 0xFF;
975 sja1000->acc_mask3 = 0xFF;
976
977 sja1000->btr0 = 0;
978 sja1000->btr1 = 0;
979
980 sja1000->outp_contr = SJA1000_DEFAULT_OUTPUT_CONTROL;
981 sja1000->mode = SJA1000_MOD_RM;
982}
983
984/*
985 * probe function for new CPC-USB devices
986 */
987static int ems_usb_probe(struct usb_interface *intf,
988 const struct usb_device_id *id)
989{
990 struct net_device *netdev;
991 struct ems_usb *dev;
992 int i, err = -ENOMEM;
993
a6e4bc53 994 netdev = alloc_candev(sizeof(struct ems_usb), MAX_TX_URBS);
702171ad 995 if (!netdev) {
1c0b28b1 996 dev_err(&intf->dev, "ems_usb: Couldn't alloc candev\n");
702171ad
SH		 997 return -ENOMEM;
998 }
999
1000 dev = netdev_priv(netdev);
1001
1002 dev->udev = interface_to_usbdev(intf);
1003 dev->netdev = netdev;
1004
1005 dev->can.state = CAN_STATE_STOPPED;
1006 dev->can.clock.freq = EMS_USB_ARM7_CLOCK;
1007 dev->can.bittiming_const = &ems_usb_bittiming_const;
1008 dev->can.do_set_bittiming = ems_usb_set_bittiming;
1009 dev->can.do_set_mode = ems_usb_set_mode;
ad72c347 1010 dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
702171ad 1011
702171ad
SH		 1012 netdev->netdev_ops = &ems_usb_netdev_ops;
1013
1014 netdev->flags |= IFF_ECHO; /* we support local echo */
1015
1016 init_usb_anchor(&dev->rx_submitted);
1017
1018 init_usb_anchor(&dev->tx_submitted);
1019 atomic_set(&dev->active_tx_urbs, 0);
1020
1021 for (i = 0; i < MAX_TX_URBS; i++)
1022 dev->tx_contexts[i].echo_index = MAX_TX_URBS;
1023
1024 dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
1025 if (!dev->intr_urb) {
1c0b28b1 1026 dev_err(&intf->dev, "Couldn't alloc intr URB\n");
702171ad
SH		 1027 goto cleanup_candev;
1028 }
1029
1030 dev->intr_in_buffer = kzalloc(INTR_IN_BUFFER_SIZE, GFP_KERNEL);
1031 if (!dev->intr_in_buffer) {
1c0b28b1 1032 dev_err(&intf->dev, "Couldn't alloc Intr buffer\n");
702171ad
SH		 1033 goto cleanup_intr_urb;
1034 }
1035
1036 dev->tx_msg_buffer = kzalloc(CPC_HEADER_SIZE +
1037 sizeof(struct ems_cpc_msg), GFP_KERNEL);
1038 if (!dev->tx_msg_buffer) {
1c0b28b1 1039 dev_err(&intf->dev, "Couldn't alloc Tx buffer\n");
702171ad
SH		 1040 goto cleanup_intr_in_buffer;
1041 }
1042
1043 usb_set_intfdata(intf, dev);
1044
1045 SET_NETDEV_DEV(netdev, &intf->dev);
1046
1047 init_params_sja1000(&dev->active_params);
1048
1049 err = ems_usb_command_msg(dev, &dev->active_params);
1050 if (err) {
1051 dev_err(netdev->dev.parent,
1052 "couldn't initialize controller: %d\n", err);
1053 goto cleanup_tx_msg_buffer;
1054 }
1055
1056 err = register_candev(netdev);
1057 if (err) {
1058 dev_err(netdev->dev.parent,
1059 "couldn't register CAN device: %d\n", err);
1060 goto cleanup_tx_msg_buffer;
1061 }
1062
1063 return 0;
1064
1065cleanup_tx_msg_buffer:
1066 kfree(dev->tx_msg_buffer);
1067
1068cleanup_intr_in_buffer:
1069 kfree(dev->intr_in_buffer);
1070
1071cleanup_intr_urb:
1072 usb_free_urb(dev->intr_urb);
1073
1074cleanup_candev:
1075 free_candev(netdev);
1076
1077 return err;
1078}
1079
1080/*
1081 * called by the usb core when the device is removed from the system
1082 */
1083static void ems_usb_disconnect(struct usb_interface *intf)
1084{
1085 struct ems_usb *dev = usb_get_intfdata(intf);
1086
1087 usb_set_intfdata(intf, NULL);
1088
1089 if (dev) {
1090 unregister_netdev(dev->netdev);
1091 free_candev(dev->netdev);
1092
1093 unlink_all_urbs(dev);
1094
1095 usb_free_urb(dev->intr_urb);
1096
1097 kfree(dev->intr_in_buffer);
1098 }
1099}
1100
1101/* usb specific object needed to register this driver with the usb subsystem */
1102static struct usb_driver ems_usb_driver = {
1103 .name = "ems_usb",
1104 .probe = ems_usb_probe,
1105 .disconnect = ems_usb_disconnect,
1106 .id_table = ems_usb_table,
1107};
1108
d632eb1b 1109module_usb_driver(ems_usb_driver);
Ubuntu Artful kernel mirror