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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
[linux-2.6-block.git] / drivers / net / can / usb / esd_usb2.c
CommitLineData
96d8e903 1/*
7653ebd5 2 * CAN driver for esd CAN-USB/2 and CAN-USB/Micro
96d8e903 3 *
7653ebd5 4 * Copyright (C) 2010-2012 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
96d8e903
MF		 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 */
96d8e903
MF		 19#include <linux/signal.h>
20#include <linux/slab.h>
21#include <linux/module.h>
22#include <linux/netdevice.h>
23#include <linux/usb.h>
24
25#include <linux/can.h>
26#include <linux/can/dev.h>
27#include <linux/can/error.h>
28
29MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
7653ebd5 30MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
96d8e903
MF		 31MODULE_LICENSE("GPL v2");
32
33/* Define these values to match your devices */
34#define USB_ESDGMBH_VENDOR_ID 0x0ab4
35#define USB_CANUSB2_PRODUCT_ID 0x0010
7653ebd5 36#define USB_CANUSBM_PRODUCT_ID 0x0011
96d8e903
MF		 37
38#define ESD_USB2_CAN_CLOCK 60000000
7653ebd5 39#define ESD_USBM_CAN_CLOCK 36000000
96d8e903
MF		 40#define ESD_USB2_MAX_NETS 2
41
42/* USB2 commands */
43#define CMD_VERSION 1 /* also used for VERSION_REPLY */
44#define CMD_CAN_RX 2 /* device to host only */
45#define CMD_CAN_TX 3 /* also used for TX_DONE */
46#define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */
47#define CMD_TS 5 /* also used for TS_REPLY */
48#define CMD_IDADD 6 /* also used for IDADD_REPLY */
49
50/* esd CAN message flags - dlc field */
51#define ESD_RTR 0x10
52
53/* esd CAN message flags - id field */
54#define ESD_EXTID 0x20000000
55#define ESD_EVENT 0x40000000
56#define ESD_IDMASK 0x1fffffff
57
58/* esd CAN event ids used by this driver */
59#define ESD_EV_CAN_ERROR_EXT 2
60
61/* baudrate message flags */
62#define ESD_USB2_UBR 0x80000000
63#define ESD_USB2_LOM 0x40000000
64#define ESD_USB2_NO_BAUDRATE 0x7fffffff
65#define ESD_USB2_TSEG1_MIN 1
66#define ESD_USB2_TSEG1_MAX 16
67#define ESD_USB2_TSEG1_SHIFT 16
68#define ESD_USB2_TSEG2_MIN 1
69#define ESD_USB2_TSEG2_MAX 8
70#define ESD_USB2_TSEG2_SHIFT 20
71#define ESD_USB2_SJW_MAX 4
72#define ESD_USB2_SJW_SHIFT 14
7653ebd5 73#define ESD_USBM_SJW_SHIFT 24
96d8e903
MF		 74#define ESD_USB2_BRP_MIN 1
75#define ESD_USB2_BRP_MAX 1024
76#define ESD_USB2_BRP_INC 1
77#define ESD_USB2_3_SAMPLES 0x00800000
78
79/* esd IDADD message */
80#define ESD_ID_ENABLE 0x80
81#define ESD_MAX_ID_SEGMENT 64
82
83/* SJA1000 ECC register (emulated by usb2 firmware) */
84#define SJA1000_ECC_SEG 0x1F
85#define SJA1000_ECC_DIR 0x20
86#define SJA1000_ECC_ERR 0x06
87#define SJA1000_ECC_BIT 0x00
88#define SJA1000_ECC_FORM 0x40
89#define SJA1000_ECC_STUFF 0x80
90#define SJA1000_ECC_MASK 0xc0
91
92/* esd bus state event codes */
93#define ESD_BUSSTATE_MASK 0xc0
94#define ESD_BUSSTATE_WARN 0x40
95#define ESD_BUSSTATE_ERRPASSIVE 0x80
96#define ESD_BUSSTATE_BUSOFF 0xc0
97
98#define RX_BUFFER_SIZE 1024
99#define MAX_RX_URBS 4
100#define MAX_TX_URBS 16 /* must be power of 2 */
101
102struct header_msg {
103 u8 len; /* len is always the total message length in 32bit words */
104 u8 cmd;
105 u8 rsvd[2];
106};
107
108struct version_msg {
109 u8 len;
110 u8 cmd;
111 u8 rsvd;
112 u8 flags;
113 __le32 drv_version;
114};
115
116struct version_reply_msg {
117 u8 len;
118 u8 cmd;
119 u8 nets;
120 u8 features;
121 __le32 version;
122 u8 name[16];
123 __le32 rsvd;
124 __le32 ts;
125};
126
127struct rx_msg {
128 u8 len;
129 u8 cmd;
130 u8 net;
131 u8 dlc;
132 __le32 ts;
133 __le32 id; /* upper 3 bits contain flags */
134 u8 data[8];
135};
136
137struct tx_msg {
138 u8 len;
139 u8 cmd;
140 u8 net;
141 u8 dlc;
6d5a7a65 142 u32 hnd; /* opaque handle, not used by device */
96d8e903
MF		 143 __le32 id; /* upper 3 bits contain flags */
144 u8 data[8];
145};
146
147struct tx_done_msg {
148 u8 len;
149 u8 cmd;
150 u8 net;
151 u8 status;
6d5a7a65 152 u32 hnd; /* opaque handle, not used by device */
96d8e903
MF		 153 __le32 ts;
154};
155
156struct id_filter_msg {
157 u8 len;
158 u8 cmd;
159 u8 net;
160 u8 option;
161 __le32 mask[ESD_MAX_ID_SEGMENT + 1];
162};
163
164struct set_baudrate_msg {
165 u8 len;
166 u8 cmd;
167 u8 net;
168 u8 rsvd;
169 __le32 baud;
170};
171
172/* Main message type used between library and application */
173struct __attribute__ ((packed)) esd_usb2_msg {
174 union {
175 struct header_msg hdr;
176 struct version_msg version;
177 struct version_reply_msg version_reply;
178 struct rx_msg rx;
179 struct tx_msg tx;
180 struct tx_done_msg txdone;
181 struct set_baudrate_msg setbaud;
182 struct id_filter_msg filter;
183 } msg;
184};
185
186static struct usb_device_id esd_usb2_table[] = {
187 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
7653ebd5 188 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)},
96d8e903
MF		 189 {}
190};
191MODULE_DEVICE_TABLE(usb, esd_usb2_table);
192
193struct esd_usb2_net_priv;
194
195struct esd_tx_urb_context {
196 struct esd_usb2_net_priv *priv;
197 u32 echo_index;
198 int dlc;
199};
200
201struct esd_usb2 {
202 struct usb_device *udev;
203 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
204
205 struct usb_anchor rx_submitted;
206
207 int net_count;
208 u32 version;
209 int rxinitdone;
210};
211
212struct esd_usb2_net_priv {
213 struct can_priv can; /* must be the first member */
214
215 atomic_t active_tx_jobs;
216 struct usb_anchor tx_submitted;
217 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
218
96d8e903
MF		 219 struct esd_usb2 *usb2;
220 struct net_device *netdev;
221 int index;
222 u8 old_state;
223 struct can_berr_counter bec;
224};
225
226static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
227 struct esd_usb2_msg *msg)
228{
229 struct net_device_stats *stats = &priv->netdev->stats;
230 struct can_frame *cf;
231 struct sk_buff *skb;
232 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
233
234 if (id == ESD_EV_CAN_ERROR_EXT) {
235 u8 state = msg->msg.rx.data[0];
236 u8 ecc = msg->msg.rx.data[1];
237 u8 txerr = msg->msg.rx.data[2];
238 u8 rxerr = msg->msg.rx.data[3];
239
240 skb = alloc_can_err_skb(priv->netdev, &cf);
241 if (skb == NULL) {
242 stats->rx_dropped++;
243 return;
244 }
245
246 if (state != priv->old_state) {
247 priv->old_state = state;
248
249 switch (state & ESD_BUSSTATE_MASK) {
250 case ESD_BUSSTATE_BUSOFF:
251 priv->can.state = CAN_STATE_BUS_OFF;
252 cf->can_id |= CAN_ERR_BUSOFF;
be38a6f9 253 priv->can.can_stats.bus_off++;
96d8e903
MF		 254 can_bus_off(priv->netdev);
255 break;
256 case ESD_BUSSTATE_WARN:
257 priv->can.state = CAN_STATE_ERROR_WARNING;
258 priv->can.can_stats.error_warning++;
259 break;
260 case ESD_BUSSTATE_ERRPASSIVE:
261 priv->can.state = CAN_STATE_ERROR_PASSIVE;
262 priv->can.can_stats.error_passive++;
263 break;
264 default:
265 priv->can.state = CAN_STATE_ERROR_ACTIVE;
266 break;
267 }
268 } else {
269 priv->can.can_stats.bus_error++;
270 stats->rx_errors++;
271
272 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
273
274 switch (ecc & SJA1000_ECC_MASK) {
275 case SJA1000_ECC_BIT:
276 cf->data[2] |= CAN_ERR_PROT_BIT;
277 break;
278 case SJA1000_ECC_FORM:
279 cf->data[2] |= CAN_ERR_PROT_FORM;
280 break;
281 case SJA1000_ECC_STUFF:
282 cf->data[2] |= CAN_ERR_PROT_STUFF;
283 break;
284 default:
285 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
286 cf->data[3] = ecc & SJA1000_ECC_SEG;
287 break;
288 }
289
25985edc 290 /* Error occurred during transmission? */
96d8e903
MF		 291 if (!(ecc & SJA1000_ECC_DIR))
292 cf->data[2] |= CAN_ERR_PROT_TX;
293
294 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
295 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
296 cf->data[1] = (txerr > rxerr) ?
297 CAN_ERR_CRTL_TX_PASSIVE :
298 CAN_ERR_CRTL_RX_PASSIVE;
299 }
300 cf->data[6] = txerr;
301 cf->data[7] = rxerr;
302 }
303
96d8e903
MF		 304 priv->bec.txerr = txerr;
305 priv->bec.rxerr = rxerr;
306
307 stats->rx_packets++;
308 stats->rx_bytes += cf->can_dlc;
296decb6 309 netif_rx(skb);
96d8e903
MF		 310 }
311}
312
313static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
314 struct esd_usb2_msg *msg)
315{
316 struct net_device_stats *stats = &priv->netdev->stats;
317 struct can_frame *cf;
318 struct sk_buff *skb;
319 int i;
320 u32 id;
321
322 if (!netif_device_present(priv->netdev))
323 return;
324
325 id = le32_to_cpu(msg->msg.rx.id);
326
327 if (id & ESD_EVENT) {
328 esd_usb2_rx_event(priv, msg);
329 } else {
330 skb = alloc_can_skb(priv->netdev, &cf);
331 if (skb == NULL) {
332 stats->rx_dropped++;
333 return;
334 }
335
336 cf->can_id = id & ESD_IDMASK;
337 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
338
339 if (id & ESD_EXTID)
340 cf->can_id |= CAN_EFF_FLAG;
341
342 if (msg->msg.rx.dlc & ESD_RTR) {
343 cf->can_id |= CAN_RTR_FLAG;
344 } else {
345 for (i = 0; i < cf->can_dlc; i++)
346 cf->data[i] = msg->msg.rx.data[i];
347 }
348
96d8e903
MF		 349 stats->rx_packets++;
350 stats->rx_bytes += cf->can_dlc;
296decb6 351 netif_rx(skb);
96d8e903
MF		 352 }
353
354 return;
355}
356
357static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
358 struct esd_usb2_msg *msg)
359{
360 struct net_device_stats *stats = &priv->netdev->stats;
361 struct net_device *netdev = priv->netdev;
362 struct esd_tx_urb_context *context;
363
364 if (!netif_device_present(netdev))
365 return;
366
367 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
368
369 if (!msg->msg.txdone.status) {
370 stats->tx_packets++;
371 stats->tx_bytes += context->dlc;
372 can_get_echo_skb(netdev, context->echo_index);
373 } else {
374 stats->tx_errors++;
375 can_free_echo_skb(netdev, context->echo_index);
376 }
377
378 /* Release context */
379 context->echo_index = MAX_TX_URBS;
380 atomic_dec(&priv->active_tx_jobs);
381
382 netif_wake_queue(netdev);
383}
384
385static void esd_usb2_read_bulk_callback(struct urb *urb)
386{
387 struct esd_usb2 *dev = urb->context;
388 int retval;
389 int pos = 0;
390 int i;
391
392 switch (urb->status) {
393 case 0: /* success */
394 break;
395
396 case -ENOENT:
397 case -ESHUTDOWN:
398 return;
399
400 default:
401 dev_info(dev->udev->dev.parent,
402 "Rx URB aborted (%d)\n", urb->status);
403 goto resubmit_urb;
404 }
405
406 while (pos < urb->actual_length) {
407 struct esd_usb2_msg *msg;
408
409 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
410
411 switch (msg->msg.hdr.cmd) {
412 case CMD_CAN_RX:
233a26e8
MS		 413 if (msg->msg.rx.net >= dev->net_count) {
414 dev_err(dev->udev->dev.parent, "format error\n");
415 break;
416 }
417
96d8e903
MF		 418 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
419 break;
420
421 case CMD_CAN_TX:
233a26e8
MS		 422 if (msg->msg.txdone.net >= dev->net_count) {
423 dev_err(dev->udev->dev.parent, "format error\n");
424 break;
425 }
426
96d8e903
MF		 427 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
428 msg);
429 break;
430 }
431
432 pos += msg->msg.hdr.len << 2;
433
434 if (pos > urb->actual_length) {
435 dev_err(dev->udev->dev.parent, "format error\n");
436 break;
437 }
438 }
439
440resubmit_urb:
441 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
442 urb->transfer_buffer, RX_BUFFER_SIZE,
443 esd_usb2_read_bulk_callback, dev);
444
445 retval = usb_submit_urb(urb, GFP_ATOMIC);
446 if (retval == -ENODEV) {
447 for (i = 0; i < dev->net_count; i++) {
448 if (dev->nets[i])
449 netif_device_detach(dev->nets[i]->netdev);
450 }
451 } else if (retval) {
452 dev_err(dev->udev->dev.parent,
453 "failed resubmitting read bulk urb: %d\n", retval);
454 }
455
456 return;
457}
458
459/*
460 * callback for bulk IN urb
461 */
462static void esd_usb2_write_bulk_callback(struct urb *urb)
463{
464 struct esd_tx_urb_context *context = urb->context;
465 struct esd_usb2_net_priv *priv;
96d8e903
MF		 466 struct net_device *netdev;
467 size_t size = sizeof(struct esd_usb2_msg);
468
469 WARN_ON(!context);
470
471 priv = context->priv;
472 netdev = priv->netdev;
96d8e903
MF		 473
474 /* free up our allocated buffer */
475 usb_free_coherent(urb->dev, size,
476 urb->transfer_buffer, urb->transfer_dma);
477
478 if (!netif_device_present(netdev))
479 return;
480
481 if (urb->status)
aabdfd6a 482 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
96d8e903
MF		 483
484 netdev->trans_start = jiffies;
485}
486
487static ssize_t show_firmware(struct device *d,
488 struct device_attribute *attr, char *buf)
489{
490 struct usb_interface *intf = to_usb_interface(d);
491 struct esd_usb2 *dev = usb_get_intfdata(intf);
492
493 return sprintf(buf, "%d.%d.%d\n",
494 (dev->version >> 12) & 0xf,
495 (dev->version >> 8) & 0xf,
496 dev->version & 0xff);
497}
498static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
499
500static ssize_t show_hardware(struct device *d,
501 struct device_attribute *attr, char *buf)
502{
503 struct usb_interface *intf = to_usb_interface(d);
504 struct esd_usb2 *dev = usb_get_intfdata(intf);
505
506 return sprintf(buf, "%d.%d.%d\n",
507 (dev->version >> 28) & 0xf,
508 (dev->version >> 24) & 0xf,
509 (dev->version >> 16) & 0xff);
510}
511static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
512
513static ssize_t show_nets(struct device *d,
514 struct device_attribute *attr, char *buf)
515{
516 struct usb_interface *intf = to_usb_interface(d);
517 struct esd_usb2 *dev = usb_get_intfdata(intf);
518
519 return sprintf(buf, "%d", dev->net_count);
520}
521static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
522
523static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
524{
525 int actual_length;
526
527 return usb_bulk_msg(dev->udev,
528 usb_sndbulkpipe(dev->udev, 2),
529 msg,
530 msg->msg.hdr.len << 2,
531 &actual_length,
532 1000);
533}
534
535static int esd_usb2_wait_msg(struct esd_usb2 *dev,
536 struct esd_usb2_msg *msg)
537{
538 int actual_length;
539
540 return usb_bulk_msg(dev->udev,
541 usb_rcvbulkpipe(dev->udev, 1),
542 msg,
543 sizeof(*msg),
544 &actual_length,
545 1000);
546}
547
548static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
549{
550 int i, err = 0;
551
552 if (dev->rxinitdone)
553 return 0;
554
555 for (i = 0; i < MAX_RX_URBS; i++) {
556 struct urb *urb = NULL;
557 u8 *buf = NULL;
558
559 /* create a URB, and a buffer for it */
560 urb = usb_alloc_urb(0, GFP_KERNEL);
561 if (!urb) {
562 dev_warn(dev->udev->dev.parent,
563 "No memory left for URBs\n");
564 err = -ENOMEM;
565 break;
566 }
567
568 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
569 &urb->transfer_dma);
570 if (!buf) {
571 dev_warn(dev->udev->dev.parent,
572 "No memory left for USB buffer\n");
573 err = -ENOMEM;
574 goto freeurb;
575 }
576
577 usb_fill_bulk_urb(urb, dev->udev,
578 usb_rcvbulkpipe(dev->udev, 1),
579 buf, RX_BUFFER_SIZE,
580 esd_usb2_read_bulk_callback, dev);
581 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
582 usb_anchor_urb(urb, &dev->rx_submitted);
583
584 err = usb_submit_urb(urb, GFP_KERNEL);
585 if (err) {
586 usb_unanchor_urb(urb);
587 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
588 urb->transfer_dma);
589 }
590
591freeurb:
592 /* Drop reference, USB core will take care of freeing it */
593 usb_free_urb(urb);
594 if (err)
595 break;
596 }
597
598 /* Did we submit any URBs */
599 if (i == 0) {
600 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
601 return err;
602 }
603
604 /* Warn if we've couldn't transmit all the URBs */
605 if (i < MAX_RX_URBS) {
606 dev_warn(dev->udev->dev.parent,
607 "rx performance may be slow\n");
608 }
609
610 dev->rxinitdone = 1;
611 return 0;
612}
613
614/*
615 * Start interface
616 */
617static int esd_usb2_start(struct esd_usb2_net_priv *priv)
618{
619 struct esd_usb2 *dev = priv->usb2;
620 struct net_device *netdev = priv->netdev;
fae37f81 621 struct esd_usb2_msg *msg;
96d8e903
MF		 622 int err, i;
623
fae37f81
OS		 624 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
625 if (!msg) {
626 err = -ENOMEM;
627 goto out;
628 }
629
96d8e903
MF		 630 /*
631 * Enable all IDs
632 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
633 * Each bit represents one 11 bit CAN identifier. A set bit
634 * enables reception of the corresponding CAN identifier. A cleared
635 * bit disabled this identifier. An additional bitmask value
636 * following the CAN 2.0A bits is used to enable reception of
637 * extended CAN frames. Only the LSB of this final mask is checked
638 * for the complete 29 bit ID range. The IDADD message also allows
639 * filter configuration for an ID subset. In this case you can add
640 * the number of the starting bitmask (0..64) to the filter.option
641 * field followed by only some bitmasks.
642 */
fae37f81
OS		 643 msg->msg.hdr.cmd = CMD_IDADD;
644 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
645 msg->msg.filter.net = priv->index;
646 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
96d8e903 647 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
fae37f81 648 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
96d8e903 649 /* enable 29bit extended IDs */
fae37f81 650 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
96d8e903 651
fae37f81 652 err = esd_usb2_send_msg(dev, msg);
96d8e903 653 if (err)
fae37f81 654 goto out;
96d8e903
MF		 655
656 err = esd_usb2_setup_rx_urbs(dev);
657 if (err)
fae37f81 658 goto out;
96d8e903
MF		 659
660 priv->can.state = CAN_STATE_ERROR_ACTIVE;
661
fae37f81 662out:
96d8e903
MF		 663 if (err == -ENODEV)
664 netif_device_detach(netdev);
fae37f81
OS		 665 if (err)
666 netdev_err(netdev, "couldn't start device: %d\n", err);
96d8e903 667
fae37f81 668 kfree(msg);
96d8e903
MF		 669 return err;
670}
671
672static void unlink_all_urbs(struct esd_usb2 *dev)
673{
674 struct esd_usb2_net_priv *priv;
0b322111 675 int i, j;
96d8e903
MF		 676
677 usb_kill_anchored_urbs(&dev->rx_submitted);
678 for (i = 0; i < dev->net_count; i++) {
679 priv = dev->nets[i];
680 if (priv) {
681 usb_kill_anchored_urbs(&priv->tx_submitted);
682 atomic_set(&priv->active_tx_jobs, 0);
683
0b322111 684 for (j = 0; j < MAX_TX_URBS; j++)
685 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
96d8e903
MF		 686 }
687 }
688}
689
690static int esd_usb2_open(struct net_device *netdev)
691{
692 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
693 int err;
694
695 /* common open */
696 err = open_candev(netdev);
697 if (err)
698 return err;
699
700 /* finally start device */
701 err = esd_usb2_start(priv);
702 if (err) {
aabdfd6a 703 netdev_warn(netdev, "couldn't start device: %d\n", err);
96d8e903
MF		 704 close_candev(netdev);
705 return err;
706 }
707
96d8e903
MF		 708 netif_start_queue(netdev);
709
710 return 0;
711}
712
713static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
714 struct net_device *netdev)
715{
716 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
717 struct esd_usb2 *dev = priv->usb2;
718 struct esd_tx_urb_context *context = NULL;
719 struct net_device_stats *stats = &netdev->stats;
720 struct can_frame *cf = (struct can_frame *)skb->data;
721 struct esd_usb2_msg *msg;
722 struct urb *urb;
723 u8 *buf;
724 int i, err;
725 int ret = NETDEV_TX_OK;
726 size_t size = sizeof(struct esd_usb2_msg);
727
728 if (can_dropped_invalid_skb(netdev, skb))
729 return NETDEV_TX_OK;
730
731 /* create a URB, and a buffer for it, and copy the data to the URB */
732 urb = usb_alloc_urb(0, GFP_ATOMIC);
733 if (!urb) {
aabdfd6a 734 netdev_err(netdev, "No memory left for URBs\n");
96d8e903
MF		 735 stats->tx_dropped++;
736 dev_kfree_skb(skb);
737 goto nourbmem;
738 }
739
740 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
741 &urb->transfer_dma);
742 if (!buf) {
aabdfd6a 743 netdev_err(netdev, "No memory left for USB buffer\n");
96d8e903
MF		 744 stats->tx_dropped++;
745 dev_kfree_skb(skb);
746 goto nobufmem;
747 }
748
749 msg = (struct esd_usb2_msg *)buf;
750
751 msg->msg.hdr.len = 3; /* minimal length */
752 msg->msg.hdr.cmd = CMD_CAN_TX;
753 msg->msg.tx.net = priv->index;
754 msg->msg.tx.dlc = cf->can_dlc;
755 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
756
757 if (cf->can_id & CAN_RTR_FLAG)
758 msg->msg.tx.dlc |= ESD_RTR;
759
760 if (cf->can_id & CAN_EFF_FLAG)
761 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
762
763 for (i = 0; i < cf->can_dlc; i++)
764 msg->msg.tx.data[i] = cf->data[i];
765
766 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
767
768 for (i = 0; i < MAX_TX_URBS; i++) {
769 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
770 context = &priv->tx_contexts[i];
771 break;
772 }
773 }
774
775 /*
776 * This may never happen.
777 */
778 if (!context) {
aabdfd6a 779 netdev_warn(netdev, "couldn't find free context\n");
96d8e903
MF		 780 ret = NETDEV_TX_BUSY;
781 goto releasebuf;
782 }
783
784 context->priv = priv;
785 context->echo_index = i;
786 context->dlc = cf->can_dlc;
787
788 /* hnd must not be 0 - MSB is stripped in txdone handling */
789 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
790
791 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
792 msg->msg.hdr.len << 2,
793 esd_usb2_write_bulk_callback, context);
794
795 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
796
797 usb_anchor_urb(urb, &priv->tx_submitted);
798
799 can_put_echo_skb(skb, netdev, context->echo_index);
800
801 atomic_inc(&priv->active_tx_jobs);
802
803 /* Slow down tx path */
804 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
805 netif_stop_queue(netdev);
806
807 err = usb_submit_urb(urb, GFP_ATOMIC);
808 if (err) {
809 can_free_echo_skb(netdev, context->echo_index);
810
811 atomic_dec(&priv->active_tx_jobs);
812 usb_unanchor_urb(urb);
813
814 stats->tx_dropped++;
815
816 if (err == -ENODEV)
817 netif_device_detach(netdev);
818 else
aabdfd6a 819 netdev_warn(netdev, "failed tx_urb %d\n", err);
96d8e903
MF		 820
821 goto releasebuf;
822 }
823
824 netdev->trans_start = jiffies;
825
826 /*
827 * Release our reference to this URB, the USB core will eventually free
828 * it entirely.
829 */
830 usb_free_urb(urb);
831
832 return NETDEV_TX_OK;
833
834releasebuf:
835 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
836
837nobufmem:
838 usb_free_urb(urb);
839
840nourbmem:
841 return ret;
842}
843
844static int esd_usb2_close(struct net_device *netdev)
845{
846 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
fae37f81 847 struct esd_usb2_msg *msg;
96d8e903
MF		 848 int i;
849
fae37f81
OS		 850 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
851 if (!msg)
852 return -ENOMEM;
853
96d8e903 854 /* Disable all IDs (see esd_usb2_start()) */
fae37f81
OS		 855 msg->msg.hdr.cmd = CMD_IDADD;
856 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
857 msg->msg.filter.net = priv->index;
858 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
96d8e903 859 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
fae37f81
OS		 860 msg->msg.filter.mask[i] = 0;
861 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
aabdfd6a 862 netdev_err(netdev, "sending idadd message failed\n");
96d8e903
MF		 863
864 /* set CAN controller to reset mode */
fae37f81
OS		 865 msg->msg.hdr.len = 2;
866 msg->msg.hdr.cmd = CMD_SETBAUD;
867 msg->msg.setbaud.net = priv->index;
868 msg->msg.setbaud.rsvd = 0;
869 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
870 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
aabdfd6a 871 netdev_err(netdev, "sending setbaud message failed\n");
96d8e903
MF		 872
873 priv->can.state = CAN_STATE_STOPPED;
874
875 netif_stop_queue(netdev);
876
877 close_candev(netdev);
878
fae37f81
OS		 879 kfree(msg);
880
96d8e903
MF		 881 return 0;
882}
883
884static const struct net_device_ops esd_usb2_netdev_ops = {
885 .ndo_open = esd_usb2_open,
886 .ndo_stop = esd_usb2_close,
887 .ndo_start_xmit = esd_usb2_start_xmit,
c971fa2a 888 .ndo_change_mtu = can_change_mtu,
96d8e903
MF		 889};
890
194b9a4c 891static const struct can_bittiming_const esd_usb2_bittiming_const = {
96d8e903
MF		 892 .name = "esd_usb2",
893 .tseg1_min = ESD_USB2_TSEG1_MIN,
894 .tseg1_max = ESD_USB2_TSEG1_MAX,
895 .tseg2_min = ESD_USB2_TSEG2_MIN,
896 .tseg2_max = ESD_USB2_TSEG2_MAX,
897 .sjw_max = ESD_USB2_SJW_MAX,
898 .brp_min = ESD_USB2_BRP_MIN,
899 .brp_max = ESD_USB2_BRP_MAX,
900 .brp_inc = ESD_USB2_BRP_INC,
901};
902
903static int esd_usb2_set_bittiming(struct net_device *netdev)
904{
905 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
906 struct can_bittiming *bt = &priv->can.bittiming;
fae37f81
OS		 907 struct esd_usb2_msg *msg;
908 int err;
96d8e903 909 u32 canbtr;
7653ebd5 910 int sjw_shift;
96d8e903
MF		 911
912 canbtr = ESD_USB2_UBR;
a5f8f0e1
MF		 913 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
914 canbtr |= ESD_USB2_LOM;
915
96d8e903 916 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
7653ebd5
MF		 917
918 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
919 USB_CANUSBM_PRODUCT_ID)
920 sjw_shift = ESD_USBM_SJW_SHIFT;
921 else
922 sjw_shift = ESD_USB2_SJW_SHIFT;
923
96d8e903 924 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
7653ebd5 925 << sjw_shift;
96d8e903
MF		 926 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
927 & (ESD_USB2_TSEG1_MAX - 1))
928 << ESD_USB2_TSEG1_SHIFT;
929 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
930 << ESD_USB2_TSEG2_SHIFT;
931 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
932 canbtr |= ESD_USB2_3_SAMPLES;
933
fae37f81
OS		 934 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
935 if (!msg)
936 return -ENOMEM;
937
938 msg->msg.hdr.len = 2;
939 msg->msg.hdr.cmd = CMD_SETBAUD;
940 msg->msg.setbaud.net = priv->index;
941 msg->msg.setbaud.rsvd = 0;
942 msg->msg.setbaud.baud = cpu_to_le32(canbtr);
96d8e903 943
aabdfd6a 944 netdev_info(netdev, "setting BTR=%#x\n", canbtr);
96d8e903 945
fae37f81
OS		 946 err = esd_usb2_send_msg(priv->usb2, msg);
947
948 kfree(msg);
949 return err;
96d8e903
MF		 950}
951
952static int esd_usb2_get_berr_counter(const struct net_device *netdev,
953 struct can_berr_counter *bec)
954{
955 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
956
957 bec->txerr = priv->bec.txerr;
958 bec->rxerr = priv->bec.rxerr;
959
960 return 0;
961}
962
963static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
964{
96d8e903
MF		 965 switch (mode) {
966 case CAN_MODE_START:
967 netif_wake_queue(netdev);
968 break;
969
970 default:
971 return -EOPNOTSUPP;
972 }
973
974 return 0;
975}
976
977static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
978{
979 struct esd_usb2 *dev = usb_get_intfdata(intf);
980 struct net_device *netdev;
981 struct esd_usb2_net_priv *priv;
982 int err = 0;
983 int i;
984
985 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
986 if (!netdev) {
987 dev_err(&intf->dev, "couldn't alloc candev\n");
988 err = -ENOMEM;
989 goto done;
990 }
991
992 priv = netdev_priv(netdev);
993
994 init_usb_anchor(&priv->tx_submitted);
995 atomic_set(&priv->active_tx_jobs, 0);
996
997 for (i = 0; i < MAX_TX_URBS; i++)
998 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
999
1000 priv->usb2 = dev;
1001 priv->netdev = netdev;
1002 priv->index = index;
1003
1004 priv->can.state = CAN_STATE_STOPPED;
a5f8f0e1 1005 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
7653ebd5
MF		 1006
1007 if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1008 USB_CANUSBM_PRODUCT_ID)
1009 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1010 else {
1011 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1012 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1013 }
1014
96d8e903
MF		 1015 priv->can.bittiming_const = &esd_usb2_bittiming_const;
1016 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1017 priv->can.do_set_mode = esd_usb2_set_mode;
1018 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
96d8e903
MF		 1019
1020 netdev->flags |= IFF_ECHO; /* we support local echo */
1021
1022 netdev->netdev_ops = &esd_usb2_netdev_ops;
1023
1024 SET_NETDEV_DEV(netdev, &intf->dev);
3e66d013 1025 netdev->dev_id = index;
96d8e903
MF		 1026
1027 err = register_candev(netdev);
1028 if (err) {
aabdfd6a 1029 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
96d8e903
MF		 1030 free_candev(netdev);
1031 err = -ENOMEM;
1032 goto done;
1033 }
1034
1035 dev->nets[index] = priv;
aabdfd6a 1036 netdev_info(netdev, "device %s registered\n", netdev->name);
96d8e903
MF		 1037
1038done:
1039 return err;
1040}
1041
1042/*
1043 * probe function for new USB2 devices
1044 *
1045 * check version information and number of available
1046 * CAN interfaces
1047 */
1048static int esd_usb2_probe(struct usb_interface *intf,
1049 const struct usb_device_id *id)
1050{
1051 struct esd_usb2 *dev;
fae37f81 1052 struct esd_usb2_msg *msg;
96d8e903
MF		 1053 int i, err;
1054
1055 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1056 if (!dev) {
1057 err = -ENOMEM;
1058 goto done;
1059 }
1060
1061 dev->udev = interface_to_usbdev(intf);
1062
1063 init_usb_anchor(&dev->rx_submitted);
1064
1065 usb_set_intfdata(intf, dev);
1066
fae37f81
OS		 1067 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1068 if (!msg) {
1069 err = -ENOMEM;
1070 goto free_msg;
1071 }
1072
96d8e903 1073 /* query number of CAN interfaces (nets) */
fae37f81
OS		 1074 msg->msg.hdr.cmd = CMD_VERSION;
1075 msg->msg.hdr.len = 2;
1076 msg->msg.version.rsvd = 0;
1077 msg->msg.version.flags = 0;
1078 msg->msg.version.drv_version = 0;
96d8e903 1079
fae37f81 1080 err = esd_usb2_send_msg(dev, msg);
96d8e903
MF		 1081 if (err < 0) {
1082 dev_err(&intf->dev, "sending version message failed\n");
fae37f81 1083 goto free_msg;
96d8e903
MF		 1084 }
1085
fae37f81 1086 err = esd_usb2_wait_msg(dev, msg);
96d8e903
MF		 1087 if (err < 0) {
1088 dev_err(&intf->dev, "no version message answer\n");
fae37f81 1089 goto free_msg;
96d8e903
MF		 1090 }
1091
fae37f81
OS		 1092 dev->net_count = (int)msg->msg.version_reply.nets;
1093 dev->version = le32_to_cpu(msg->msg.version_reply.version);
96d8e903
MF		 1094
1095 if (device_create_file(&intf->dev, &dev_attr_firmware))
1096 dev_err(&intf->dev,
1097 "Couldn't create device file for firmware\n");
1098
1099 if (device_create_file(&intf->dev, &dev_attr_hardware))
1100 dev_err(&intf->dev,
1101 "Couldn't create device file for hardware\n");
1102
1103 if (device_create_file(&intf->dev, &dev_attr_nets))
1104 dev_err(&intf->dev,
1105 "Couldn't create device file for nets\n");
1106
1107 /* do per device probing */
1108 for (i = 0; i < dev->net_count; i++)
1109 esd_usb2_probe_one_net(intf, i);
1110
fae37f81
OS		 1111free_msg:
1112 kfree(msg);
1113 if (err)
1114 kfree(dev);
96d8e903
MF		 1115done:
1116 return err;
1117}
1118
1119/*
1120 * called by the usb core when the device is removed from the system
1121 */
1122static void esd_usb2_disconnect(struct usb_interface *intf)
1123{
1124 struct esd_usb2 *dev = usb_get_intfdata(intf);
1125 struct net_device *netdev;
1126 int i;
1127
1128 device_remove_file(&intf->dev, &dev_attr_firmware);
1129 device_remove_file(&intf->dev, &dev_attr_hardware);
1130 device_remove_file(&intf->dev, &dev_attr_nets);
1131
1132 usb_set_intfdata(intf, NULL);
1133
1134 if (dev) {
1135 for (i = 0; i < dev->net_count; i++) {
1136 if (dev->nets[i]) {
1137 netdev = dev->nets[i]->netdev;
1138 unregister_netdev(netdev);
1139 free_candev(netdev);
1140 }
1141 }
1142 unlink_all_urbs(dev);
efbd50d2 1143 kfree(dev);
96d8e903
MF		 1144 }
1145}
1146
1147/* usb specific object needed to register this driver with the usb subsystem */
1148static struct usb_driver esd_usb2_driver = {
1149 .name = "esd_usb2",
1150 .probe = esd_usb2_probe,
1151 .disconnect = esd_usb2_disconnect,
1152 .id_table = esd_usb2_table,
1153};
1154
d632eb1b 1155module_usb_driver(esd_usb2_driver);
Linux 6.x block layer and io_uring tree(s)