1 // SPDX-License-Identifier: GPL-2.0-only
2 /* CAN driver for Geschwister Schneider USB/CAN devices
3 * and bytewerk.org candleLight USB CAN interfaces.
4 *
5 * Copyright (C) 2013-2016 Geschwister Schneider Technologie-,
6 * Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
7 * Copyright (C) 2016 Hubert Denkmair
8 * Copyright (c) 2023 Pengutronix, Marc Kleine-Budde <kernel@pengutronix.de>
9 *
10 * Many thanks to all socketcan devs!
11 */
12
13 #include <linux/bitfield.h>
14 #include <linux/clocksource.h>
15 #include <linux/ethtool.h>
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <linux/netdevice.h>
19 #include <linux/signal.h>
20 #include <linux/timecounter.h>
21 #include <linux/units.h>
22 #include <linux/usb.h>
23 #include <linux/workqueue.h>
24
25 #include <linux/can.h>
26 #include <linux/can/dev.h>
27 #include <linux/can/error.h>
28 #include <linux/can/rx-offload.h>
29
30 /* Device specific constants */
31 #define USB_GS_USB_1_VENDOR_ID 0x1d50
32 #define USB_GS_USB_1_PRODUCT_ID 0x606f
33
34 #define USB_CANDLELIGHT_VENDOR_ID 0x1209
35 #define USB_CANDLELIGHT_PRODUCT_ID 0x2323
36
37 #define USB_CES_CANEXT_FD_VENDOR_ID 0x1cd2
38 #define USB_CES_CANEXT_FD_PRODUCT_ID 0x606f
39
40 #define USB_ABE_CANDEBUGGER_FD_VENDOR_ID 0x16d0
41 #define USB_ABE_CANDEBUGGER_FD_PRODUCT_ID 0x10b8
42
43 #define USB_XYLANTA_SAINT3_VENDOR_ID 0x16d0
44 #define USB_XYLANTA_SAINT3_PRODUCT_ID 0x0f30
45
46 #define GS_USB_ENDPOINT_IN 1
47 #define GS_USB_ENDPOINT_OUT 2
48
49 /* Timestamp 32 bit timer runs at 1 MHz (1 µs tick). Worker accounts
50 * for timer overflow (will be after ~71 minutes)
51 */
52 #define GS_USB_TIMESTAMP_TIMER_HZ (1 * HZ_PER_MHZ)
53 #define GS_USB_TIMESTAMP_WORK_DELAY_SEC 1800
54 static_assert(GS_USB_TIMESTAMP_WORK_DELAY_SEC <
55 CYCLECOUNTER_MASK(32) / GS_USB_TIMESTAMP_TIMER_HZ / 2);
56
57 /* Device specific constants */
58 enum gs_usb_breq {
59 GS_USB_BREQ_HOST_FORMAT = 0,
60 GS_USB_BREQ_BITTIMING,
61 GS_USB_BREQ_MODE,
62 GS_USB_BREQ_BERR,
63 GS_USB_BREQ_BT_CONST,
64 GS_USB_BREQ_DEVICE_CONFIG,
65 GS_USB_BREQ_TIMESTAMP,
66 GS_USB_BREQ_IDENTIFY,
67 GS_USB_BREQ_GET_USER_ID,
68 GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING = GS_USB_BREQ_GET_USER_ID,
69 GS_USB_BREQ_SET_USER_ID,
70 GS_USB_BREQ_DATA_BITTIMING,
71 GS_USB_BREQ_BT_CONST_EXT,
72 GS_USB_BREQ_SET_TERMINATION,
73 GS_USB_BREQ_GET_TERMINATION,
74 GS_USB_BREQ_GET_STATE,
75 };
76
77 enum gs_can_mode {
78 /* reset a channel. turns it off */
79 GS_CAN_MODE_RESET = 0,
80 /* starts a channel */
81 GS_CAN_MODE_START
82 };
83
84 enum gs_can_state {
85 GS_CAN_STATE_ERROR_ACTIVE = 0,
86 GS_CAN_STATE_ERROR_WARNING,
87 GS_CAN_STATE_ERROR_PASSIVE,
88 GS_CAN_STATE_BUS_OFF,
89 GS_CAN_STATE_STOPPED,
90 GS_CAN_STATE_SLEEPING
91 };
92
93 enum gs_can_identify_mode {
94 GS_CAN_IDENTIFY_OFF = 0,
95 GS_CAN_IDENTIFY_ON
96 };
97
98 enum gs_can_termination_state {
99 GS_CAN_TERMINATION_STATE_OFF = 0,
100 GS_CAN_TERMINATION_STATE_ON
101 };
102
103 #define GS_USB_TERMINATION_DISABLED CAN_TERMINATION_DISABLED
104 #define GS_USB_TERMINATION_ENABLED 120
105
106 /* data types passed between host and device */
107
108 /* The firmware on the original USB2CAN by Geschwister Schneider
109 * Technologie Entwicklungs- und Vertriebs UG exchanges all data
110 * between the host and the device in host byte order. This is done
111 * with the struct gs_host_config::byte_order member, which is sent
112 * first to indicate the desired byte order.
113 *
114 * The widely used open source firmware candleLight doesn't support
115 * this feature and exchanges the data in little endian byte order.
116 */
117 struct gs_host_config {
118 __le32 byte_order;
119 } __packed;
120
121 struct gs_device_config {
122 u8 reserved1;
123 u8 reserved2;
124 u8 reserved3;
125 u8 icount;
126 __le32 sw_version;
127 __le32 hw_version;
128 } __packed;
129
130 #define GS_CAN_MODE_NORMAL 0
131 #define GS_CAN_MODE_LISTEN_ONLY BIT(0)
132 #define GS_CAN_MODE_LOOP_BACK BIT(1)
133 #define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2)
134 #define GS_CAN_MODE_ONE_SHOT BIT(3)
135 #define GS_CAN_MODE_HW_TIMESTAMP BIT(4)
136 /* GS_CAN_FEATURE_IDENTIFY BIT(5) */
137 /* GS_CAN_FEATURE_USER_ID BIT(6) */
138 #define GS_CAN_MODE_PAD_PKTS_TO_MAX_PKT_SIZE BIT(7)
139 #define GS_CAN_MODE_FD BIT(8)
140 /* GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX BIT(9) */
141 /* GS_CAN_FEATURE_BT_CONST_EXT BIT(10) */
142 /* GS_CAN_FEATURE_TERMINATION BIT(11) */
143 #define GS_CAN_MODE_BERR_REPORTING BIT(12)
144 /* GS_CAN_FEATURE_GET_STATE BIT(13) */
145
146 struct gs_device_mode {
147 __le32 mode;
148 __le32 flags;
149 } __packed;
150
151 struct gs_device_state {
152 __le32 state;
153 __le32 rxerr;
154 __le32 txerr;
155 } __packed;
156
157 struct gs_device_bittiming {
158 __le32 prop_seg;
159 __le32 phase_seg1;
160 __le32 phase_seg2;
161 __le32 sjw;
162 __le32 brp;
163 } __packed;
164
165 struct gs_identify_mode {
166 __le32 mode;
167 } __packed;
168
169 struct gs_device_termination_state {
170 __le32 state;
171 } __packed;
172
173 #define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
174 #define GS_CAN_FEATURE_LOOP_BACK BIT(1)
175 #define GS_CAN_FEATURE_TRIPLE_SAMPLE BIT(2)
176 #define GS_CAN_FEATURE_ONE_SHOT BIT(3)
177 #define GS_CAN_FEATURE_HW_TIMESTAMP BIT(4)
178 #define GS_CAN_FEATURE_IDENTIFY BIT(5)
179 #define GS_CAN_FEATURE_USER_ID BIT(6)
180 #define GS_CAN_FEATURE_PAD_PKTS_TO_MAX_PKT_SIZE BIT(7)
181 #define GS_CAN_FEATURE_FD BIT(8)
182 #define GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX BIT(9)
183 #define GS_CAN_FEATURE_BT_CONST_EXT BIT(10)
184 #define GS_CAN_FEATURE_TERMINATION BIT(11)
185 #define GS_CAN_FEATURE_BERR_REPORTING BIT(12)
186 #define GS_CAN_FEATURE_GET_STATE BIT(13)
187 #define GS_CAN_FEATURE_MASK GENMASK(13, 0)
188
189 /* internal quirks - keep in GS_CAN_FEATURE space for now */
190
191 /* CANtact Pro original firmware:
192 * BREQ DATA_BITTIMING overlaps with GET_USER_ID
193 */
194 #define GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO BIT(31)
195
196 struct gs_device_bt_const {
197 __le32 feature;
198 __le32 fclk_can;
199 __le32 tseg1_min;
200 __le32 tseg1_max;
201 __le32 tseg2_min;
202 __le32 tseg2_max;
203 __le32 sjw_max;
204 __le32 brp_min;
205 __le32 brp_max;
206 __le32 brp_inc;
207 } __packed;
208
209 struct gs_device_bt_const_extended {
210 __le32 feature;
211 __le32 fclk_can;
212 __le32 tseg1_min;
213 __le32 tseg1_max;
214 __le32 tseg2_min;
215 __le32 tseg2_max;
216 __le32 sjw_max;
217 __le32 brp_min;
218 __le32 brp_max;
219 __le32 brp_inc;
220
221 __le32 dtseg1_min;
222 __le32 dtseg1_max;
223 __le32 dtseg2_min;
224 __le32 dtseg2_max;
225 __le32 dsjw_max;
226 __le32 dbrp_min;
227 __le32 dbrp_max;
228 __le32 dbrp_inc;
229 } __packed;
230
231 #define GS_CAN_FLAG_OVERFLOW BIT(0)
232 #define GS_CAN_FLAG_FD BIT(1)
233 #define GS_CAN_FLAG_BRS BIT(2)
234 #define GS_CAN_FLAG_ESI BIT(3)
235
236 struct classic_can {
237 u8 data[8];
238 } __packed;
239
240 struct classic_can_ts {
241 u8 data[8];
242 __le32 timestamp_us;
243 } __packed;
244
245 struct classic_can_quirk {
246 u8 data[8];
247 u8 quirk;
248 } __packed;
249
250 struct canfd {
251 u8 data[64];
252 } __packed;
253
254 struct canfd_ts {
255 u8 data[64];
256 __le32 timestamp_us;
257 } __packed;
258
259 struct canfd_quirk {
260 u8 data[64];
261 u8 quirk;
262 } __packed;
263
264 struct gs_host_frame {
265 u32 echo_id;
266 __le32 can_id;
267
268 u8 can_dlc;
269 u8 channel;
270 u8 flags;
271 u8 reserved;
272
273 union {
274 DECLARE_FLEX_ARRAY(struct classic_can, classic_can);
275 DECLARE_FLEX_ARRAY(struct classic_can_ts, classic_can_ts);
276 DECLARE_FLEX_ARRAY(struct classic_can_quirk, classic_can_quirk);
277 DECLARE_FLEX_ARRAY(struct canfd, canfd);
278 DECLARE_FLEX_ARRAY(struct canfd_ts, canfd_ts);
279 DECLARE_FLEX_ARRAY(struct canfd_quirk, canfd_quirk);
280 };
281 } __packed;
282 /* The GS USB devices make use of the same flags and masks as in
283 * linux/can.h and linux/can/error.h, and no additional mapping is necessary.
284 */
285
286 /* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
287 #define GS_MAX_TX_URBS 10
288 /* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
289 #define GS_MAX_RX_URBS 30
290 #define GS_NAPI_WEIGHT 32
291
292 /* Maximum number of interfaces the driver supports per device.
293 * Current hardware only supports 3 interfaces. The future may vary.
294 */
295 #define GS_MAX_INTF 3
296
297 struct gs_tx_context {
298 struct gs_can *dev;
299 unsigned int echo_id;
300 };
301
302 struct gs_can {
303 struct can_priv can; /* must be the first member */
304
305 struct can_rx_offload offload;
306 struct gs_usb *parent;
307
308 struct net_device *netdev;
309 struct usb_device *udev;
310
311 struct can_bittiming_const bt_const, data_bt_const;
312 unsigned int channel; /* channel number */
313
314 u32 feature;
315 unsigned int hf_size_tx;
316
317 /* This lock prevents a race condition between xmit and receive. */
318 spinlock_t tx_ctx_lock;
319 struct gs_tx_context tx_context[GS_MAX_TX_URBS];
320
321 struct usb_anchor tx_submitted;
322 atomic_t active_tx_urbs;
323 };
324
325 /* usb interface struct */
326 struct gs_usb {
327 struct gs_can *canch[GS_MAX_INTF];
328 struct usb_anchor rx_submitted;
329 struct usb_device *udev;
330
331 /* time counter for hardware timestamps */
332 struct cyclecounter cc;
333 struct timecounter tc;
334 spinlock_t tc_lock; /* spinlock to guard access tc->cycle_last */
335 struct delayed_work timestamp;
336
337 unsigned int hf_size_rx;
338 u8 active_channels;
339 };
340
341 /* 'allocate' a tx context.
342 * returns a valid tx context or NULL if there is no space.
343 */
gs_alloc_tx_context(struct gs_can * dev)344 static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
345 {
346 int i = 0;
347 unsigned long flags;
348
349 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
350
351 for (; i < GS_MAX_TX_URBS; i++) {
352 if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
353 dev->tx_context[i].echo_id = i;
354 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
355 return &dev->tx_context[i];
356 }
357 }
358
359 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
360 return NULL;
361 }
362
363 /* releases a tx context
364 */
gs_free_tx_context(struct gs_tx_context * txc)365 static void gs_free_tx_context(struct gs_tx_context *txc)
366 {
367 txc->echo_id = GS_MAX_TX_URBS;
368 }
369
370 /* Get a tx context by id.
371 */
gs_get_tx_context(struct gs_can * dev,unsigned int id)372 static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
373 unsigned int id)
374 {
375 unsigned long flags;
376
377 if (id < GS_MAX_TX_URBS) {
378 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
379 if (dev->tx_context[id].echo_id == id) {
380 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
381 return &dev->tx_context[id];
382 }
383 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
384 }
385 return NULL;
386 }
387
gs_cmd_reset(struct gs_can * dev)388 static int gs_cmd_reset(struct gs_can *dev)
389 {
390 struct gs_device_mode dm = {
391 .mode = cpu_to_le32(GS_CAN_MODE_RESET),
392 };
393
394 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_MODE,
395 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
396 dev->channel, 0, &dm, sizeof(dm), 1000,
397 GFP_KERNEL);
398 }
399
gs_usb_get_timestamp(const struct gs_usb * parent,u32 * timestamp_p)400 static inline int gs_usb_get_timestamp(const struct gs_usb *parent,
401 u32 *timestamp_p)
402 {
403 __le32 timestamp;
404 int rc;
405
406 rc = usb_control_msg_recv(parent->udev, 0, GS_USB_BREQ_TIMESTAMP,
407 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
408 0, 0,
409 ×tamp, sizeof(timestamp),
410 USB_CTRL_GET_TIMEOUT,
411 GFP_KERNEL);
412 if (rc)
413 return rc;
414
415 *timestamp_p = le32_to_cpu(timestamp);
416
417 return 0;
418 }
419
gs_usb_timestamp_read(const struct cyclecounter * cc)420 static u64 gs_usb_timestamp_read(const struct cyclecounter *cc) __must_hold(&dev->tc_lock)
421 {
422 struct gs_usb *parent = container_of(cc, struct gs_usb, cc);
423 u32 timestamp = 0;
424 int err;
425
426 lockdep_assert_held(&parent->tc_lock);
427
428 /* drop lock for synchronous USB transfer */
429 spin_unlock_bh(&parent->tc_lock);
430 err = gs_usb_get_timestamp(parent, ×tamp);
431 spin_lock_bh(&parent->tc_lock);
432 if (err)
433 dev_err(&parent->udev->dev,
434 "Error %d while reading timestamp. HW timestamps may be inaccurate.",
435 err);
436
437 return timestamp;
438 }
439
gs_usb_timestamp_work(struct work_struct * work)440 static void gs_usb_timestamp_work(struct work_struct *work)
441 {
442 struct delayed_work *delayed_work = to_delayed_work(work);
443 struct gs_usb *parent;
444
445 parent = container_of(delayed_work, struct gs_usb, timestamp);
446 spin_lock_bh(&parent->tc_lock);
447 timecounter_read(&parent->tc);
448 spin_unlock_bh(&parent->tc_lock);
449
450 schedule_delayed_work(&parent->timestamp,
451 GS_USB_TIMESTAMP_WORK_DELAY_SEC * HZ);
452 }
453
gs_usb_skb_set_timestamp(struct gs_can * dev,struct sk_buff * skb,u32 timestamp)454 static void gs_usb_skb_set_timestamp(struct gs_can *dev,
455 struct sk_buff *skb, u32 timestamp)
456 {
457 struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
458 struct gs_usb *parent = dev->parent;
459 u64 ns;
460
461 spin_lock_bh(&parent->tc_lock);
462 ns = timecounter_cyc2time(&parent->tc, timestamp);
463 spin_unlock_bh(&parent->tc_lock);
464
465 hwtstamps->hwtstamp = ns_to_ktime(ns);
466 }
467
gs_usb_timestamp_init(struct gs_usb * parent)468 static void gs_usb_timestamp_init(struct gs_usb *parent)
469 {
470 struct cyclecounter *cc = &parent->cc;
471
472 cc->read = gs_usb_timestamp_read;
473 cc->mask = CYCLECOUNTER_MASK(32);
474 cc->shift = 32 - bits_per(NSEC_PER_SEC / GS_USB_TIMESTAMP_TIMER_HZ);
475 cc->mult = clocksource_hz2mult(GS_USB_TIMESTAMP_TIMER_HZ, cc->shift);
476
477 spin_lock_init(&parent->tc_lock);
478 spin_lock_bh(&parent->tc_lock);
479 timecounter_init(&parent->tc, &parent->cc, ktime_get_real_ns());
480 spin_unlock_bh(&parent->tc_lock);
481
482 INIT_DELAYED_WORK(&parent->timestamp, gs_usb_timestamp_work);
483 schedule_delayed_work(&parent->timestamp,
484 GS_USB_TIMESTAMP_WORK_DELAY_SEC * HZ);
485 }
486
gs_usb_timestamp_stop(struct gs_usb * parent)487 static void gs_usb_timestamp_stop(struct gs_usb *parent)
488 {
489 cancel_delayed_work_sync(&parent->timestamp);
490 }
491
gs_update_state(struct gs_can * dev,struct can_frame * cf)492 static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
493 {
494 struct can_device_stats *can_stats = &dev->can.can_stats;
495
496 if (cf->can_id & CAN_ERR_RESTARTED) {
497 dev->can.state = CAN_STATE_ERROR_ACTIVE;
498 can_stats->restarts++;
499 } else if (cf->can_id & CAN_ERR_BUSOFF) {
500 dev->can.state = CAN_STATE_BUS_OFF;
501 can_stats->bus_off++;
502 } else if (cf->can_id & CAN_ERR_CRTL) {
503 if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
504 (cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
505 dev->can.state = CAN_STATE_ERROR_WARNING;
506 can_stats->error_warning++;
507 } else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
508 (cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
509 dev->can.state = CAN_STATE_ERROR_PASSIVE;
510 can_stats->error_passive++;
511 } else {
512 dev->can.state = CAN_STATE_ERROR_ACTIVE;
513 }
514 }
515 }
516
gs_usb_set_timestamp(struct gs_can * dev,struct sk_buff * skb,const struct gs_host_frame * hf)517 static u32 gs_usb_set_timestamp(struct gs_can *dev, struct sk_buff *skb,
518 const struct gs_host_frame *hf)
519 {
520 u32 timestamp;
521
522 if (hf->flags & GS_CAN_FLAG_FD)
523 timestamp = le32_to_cpu(hf->canfd_ts->timestamp_us);
524 else
525 timestamp = le32_to_cpu(hf->classic_can_ts->timestamp_us);
526
527 if (skb)
528 gs_usb_skb_set_timestamp(dev, skb, timestamp);
529
530 return timestamp;
531 }
532
gs_usb_rx_offload(struct gs_can * dev,struct sk_buff * skb,const struct gs_host_frame * hf)533 static void gs_usb_rx_offload(struct gs_can *dev, struct sk_buff *skb,
534 const struct gs_host_frame *hf)
535 {
536 struct can_rx_offload *offload = &dev->offload;
537 int rc;
538
539 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP) {
540 const u32 ts = gs_usb_set_timestamp(dev, skb, hf);
541
542 rc = can_rx_offload_queue_timestamp(offload, skb, ts);
543 } else {
544 rc = can_rx_offload_queue_tail(offload, skb);
545 }
546
547 if (rc)
548 dev->netdev->stats.rx_fifo_errors++;
549 }
550
551 static unsigned int
gs_usb_get_echo_skb(struct gs_can * dev,struct sk_buff * skb,const struct gs_host_frame * hf)552 gs_usb_get_echo_skb(struct gs_can *dev, struct sk_buff *skb,
553 const struct gs_host_frame *hf)
554 {
555 struct can_rx_offload *offload = &dev->offload;
556 const u32 echo_id = hf->echo_id;
557 unsigned int len;
558
559 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP) {
560 const u32 ts = gs_usb_set_timestamp(dev, skb, hf);
561
562 len = can_rx_offload_get_echo_skb_queue_timestamp(offload, echo_id,
563 ts, NULL);
564 } else {
565 len = can_rx_offload_get_echo_skb_queue_tail(offload, echo_id,
566 NULL);
567 }
568
569 return len;
570 }
571
gs_usb_receive_bulk_callback(struct urb * urb)572 static void gs_usb_receive_bulk_callback(struct urb *urb)
573 {
574 struct gs_usb *parent = urb->context;
575 struct gs_can *dev;
576 struct net_device *netdev;
577 int rc;
578 struct net_device_stats *stats;
579 struct gs_host_frame *hf = urb->transfer_buffer;
580 struct gs_tx_context *txc;
581 struct can_frame *cf;
582 struct canfd_frame *cfd;
583 struct sk_buff *skb;
584
585 BUG_ON(!parent);
586
587 switch (urb->status) {
588 case 0: /* success */
589 break;
590 case -ENOENT:
591 case -ESHUTDOWN:
592 return;
593 default:
594 /* do not resubmit aborted urbs. eg: when device goes down */
595 return;
596 }
597
598 /* device reports out of range channel id */
599 if (hf->channel >= GS_MAX_INTF)
600 goto device_detach;
601
602 dev = parent->canch[hf->channel];
603
604 netdev = dev->netdev;
605 stats = &netdev->stats;
606
607 if (!netif_device_present(netdev))
608 return;
609
610 if (!netif_running(netdev))
611 goto resubmit_urb;
612
613 if (hf->echo_id == -1) { /* normal rx */
614 if (hf->flags & GS_CAN_FLAG_FD) {
615 skb = alloc_canfd_skb(netdev, &cfd);
616 if (!skb)
617 return;
618
619 cfd->can_id = le32_to_cpu(hf->can_id);
620 cfd->len = can_fd_dlc2len(hf->can_dlc);
621 if (hf->flags & GS_CAN_FLAG_BRS)
622 cfd->flags |= CANFD_BRS;
623 if (hf->flags & GS_CAN_FLAG_ESI)
624 cfd->flags |= CANFD_ESI;
625
626 memcpy(cfd->data, hf->canfd->data, cfd->len);
627 } else {
628 skb = alloc_can_skb(netdev, &cf);
629 if (!skb)
630 return;
631
632 cf->can_id = le32_to_cpu(hf->can_id);
633 can_frame_set_cc_len(cf, hf->can_dlc, dev->can.ctrlmode);
634
635 memcpy(cf->data, hf->classic_can->data, 8);
636
637 /* ERROR frames tell us information about the controller */
638 if (le32_to_cpu(hf->can_id) & CAN_ERR_FLAG)
639 gs_update_state(dev, cf);
640 }
641
642 gs_usb_rx_offload(dev, skb, hf);
643 } else { /* echo_id == hf->echo_id */
644 if (hf->echo_id >= GS_MAX_TX_URBS) {
645 netdev_err(netdev,
646 "Unexpected out of range echo id %u\n",
647 hf->echo_id);
648 goto resubmit_urb;
649 }
650
651 txc = gs_get_tx_context(dev, hf->echo_id);
652
653 /* bad devices send bad echo_ids. */
654 if (!txc) {
655 netdev_err(netdev,
656 "Unexpected unused echo id %u\n",
657 hf->echo_id);
658 goto resubmit_urb;
659 }
660
661 skb = dev->can.echo_skb[hf->echo_id];
662 stats->tx_packets++;
663 stats->tx_bytes += gs_usb_get_echo_skb(dev, skb, hf);
664 gs_free_tx_context(txc);
665
666 atomic_dec(&dev->active_tx_urbs);
667
668 netif_wake_queue(netdev);
669 }
670
671 if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
672 stats->rx_over_errors++;
673 stats->rx_errors++;
674
675 skb = alloc_can_err_skb(netdev, &cf);
676 if (!skb)
677 goto resubmit_urb;
678
679 cf->can_id |= CAN_ERR_CRTL;
680 cf->len = CAN_ERR_DLC;
681 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
682
683 gs_usb_rx_offload(dev, skb, hf);
684 }
685
686 can_rx_offload_irq_finish(&dev->offload);
687
688 resubmit_urb:
689 usb_fill_bulk_urb(urb, parent->udev,
690 usb_rcvbulkpipe(parent->udev, GS_USB_ENDPOINT_IN),
691 hf, dev->parent->hf_size_rx,
692 gs_usb_receive_bulk_callback, parent);
693
694 rc = usb_submit_urb(urb, GFP_ATOMIC);
695
696 /* USB failure take down all interfaces */
697 if (rc == -ENODEV) {
698 device_detach:
699 for (rc = 0; rc < GS_MAX_INTF; rc++) {
700 if (parent->canch[rc])
701 netif_device_detach(parent->canch[rc]->netdev);
702 }
703 }
704 }
705
gs_usb_set_bittiming(struct net_device * netdev)706 static int gs_usb_set_bittiming(struct net_device *netdev)
707 {
708 struct gs_can *dev = netdev_priv(netdev);
709 struct can_bittiming *bt = &dev->can.bittiming;
710 struct gs_device_bittiming dbt = {
711 .prop_seg = cpu_to_le32(bt->prop_seg),
712 .phase_seg1 = cpu_to_le32(bt->phase_seg1),
713 .phase_seg2 = cpu_to_le32(bt->phase_seg2),
714 .sjw = cpu_to_le32(bt->sjw),
715 .brp = cpu_to_le32(bt->brp),
716 };
717
718 /* request bit timings */
719 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_BITTIMING,
720 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
721 dev->channel, 0, &dbt, sizeof(dbt), 1000,
722 GFP_KERNEL);
723 }
724
gs_usb_set_data_bittiming(struct net_device * netdev)725 static int gs_usb_set_data_bittiming(struct net_device *netdev)
726 {
727 struct gs_can *dev = netdev_priv(netdev);
728 struct can_bittiming *bt = &dev->can.data_bittiming;
729 struct gs_device_bittiming dbt = {
730 .prop_seg = cpu_to_le32(bt->prop_seg),
731 .phase_seg1 = cpu_to_le32(bt->phase_seg1),
732 .phase_seg2 = cpu_to_le32(bt->phase_seg2),
733 .sjw = cpu_to_le32(bt->sjw),
734 .brp = cpu_to_le32(bt->brp),
735 };
736 u8 request = GS_USB_BREQ_DATA_BITTIMING;
737
738 if (dev->feature & GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO)
739 request = GS_USB_BREQ_QUIRK_CANTACT_PRO_DATA_BITTIMING;
740
741 /* request data bit timings */
742 return usb_control_msg_send(dev->udev, 0, request,
743 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
744 dev->channel, 0, &dbt, sizeof(dbt), 1000,
745 GFP_KERNEL);
746 }
747
gs_usb_xmit_callback(struct urb * urb)748 static void gs_usb_xmit_callback(struct urb *urb)
749 {
750 struct gs_tx_context *txc = urb->context;
751 struct gs_can *dev = txc->dev;
752 struct net_device *netdev = dev->netdev;
753
754 if (urb->status)
755 netdev_info(netdev, "usb xmit fail %u\n", txc->echo_id);
756 }
757
gs_can_start_xmit(struct sk_buff * skb,struct net_device * netdev)758 static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
759 struct net_device *netdev)
760 {
761 struct gs_can *dev = netdev_priv(netdev);
762 struct net_device_stats *stats = &dev->netdev->stats;
763 struct urb *urb;
764 struct gs_host_frame *hf;
765 struct can_frame *cf;
766 struct canfd_frame *cfd;
767 int rc;
768 unsigned int idx;
769 struct gs_tx_context *txc;
770
771 if (can_dev_dropped_skb(netdev, skb))
772 return NETDEV_TX_OK;
773
774 /* find an empty context to keep track of transmission */
775 txc = gs_alloc_tx_context(dev);
776 if (!txc)
777 return NETDEV_TX_BUSY;
778
779 /* create a URB, and a buffer for it */
780 urb = usb_alloc_urb(0, GFP_ATOMIC);
781 if (!urb)
782 goto nomem_urb;
783
784 hf = kmalloc(dev->hf_size_tx, GFP_ATOMIC);
785 if (!hf)
786 goto nomem_hf;
787
788 idx = txc->echo_id;
789
790 if (idx >= GS_MAX_TX_URBS) {
791 netdev_err(netdev, "Invalid tx context %u\n", idx);
792 goto badidx;
793 }
794
795 hf->echo_id = idx;
796 hf->channel = dev->channel;
797 hf->flags = 0;
798 hf->reserved = 0;
799
800 if (can_is_canfd_skb(skb)) {
801 cfd = (struct canfd_frame *)skb->data;
802
803 hf->can_id = cpu_to_le32(cfd->can_id);
804 hf->can_dlc = can_fd_len2dlc(cfd->len);
805 hf->flags |= GS_CAN_FLAG_FD;
806 if (cfd->flags & CANFD_BRS)
807 hf->flags |= GS_CAN_FLAG_BRS;
808 if (cfd->flags & CANFD_ESI)
809 hf->flags |= GS_CAN_FLAG_ESI;
810
811 memcpy(hf->canfd->data, cfd->data, cfd->len);
812 } else {
813 cf = (struct can_frame *)skb->data;
814
815 hf->can_id = cpu_to_le32(cf->can_id);
816 hf->can_dlc = can_get_cc_dlc(cf, dev->can.ctrlmode);
817
818 memcpy(hf->classic_can->data, cf->data, cf->len);
819 }
820
821 usb_fill_bulk_urb(urb, dev->udev,
822 usb_sndbulkpipe(dev->udev, GS_USB_ENDPOINT_OUT),
823 hf, dev->hf_size_tx,
824 gs_usb_xmit_callback, txc);
825
826 urb->transfer_flags |= URB_FREE_BUFFER;
827 usb_anchor_urb(urb, &dev->tx_submitted);
828
829 can_put_echo_skb(skb, netdev, idx, 0);
830
831 atomic_inc(&dev->active_tx_urbs);
832
833 rc = usb_submit_urb(urb, GFP_ATOMIC);
834 if (unlikely(rc)) { /* usb send failed */
835 atomic_dec(&dev->active_tx_urbs);
836
837 can_free_echo_skb(netdev, idx, NULL);
838 gs_free_tx_context(txc);
839
840 usb_unanchor_urb(urb);
841
842 if (rc == -ENODEV) {
843 netif_device_detach(netdev);
844 } else {
845 netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
846 stats->tx_dropped++;
847 }
848 } else {
849 /* Slow down tx path */
850 if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
851 netif_stop_queue(netdev);
852 }
853
854 /* let usb core take care of this urb */
855 usb_free_urb(urb);
856
857 return NETDEV_TX_OK;
858
859 badidx:
860 kfree(hf);
861 nomem_hf:
862 usb_free_urb(urb);
863
864 nomem_urb:
865 gs_free_tx_context(txc);
866 dev_kfree_skb(skb);
867 stats->tx_dropped++;
868 return NETDEV_TX_OK;
869 }
870
gs_can_open(struct net_device * netdev)871 static int gs_can_open(struct net_device *netdev)
872 {
873 struct gs_can *dev = netdev_priv(netdev);
874 struct gs_usb *parent = dev->parent;
875 struct gs_device_mode dm = {
876 .mode = cpu_to_le32(GS_CAN_MODE_START),
877 };
878 struct gs_host_frame *hf;
879 struct urb *urb = NULL;
880 u32 ctrlmode;
881 u32 flags = 0;
882 int rc, i;
883
884 rc = open_candev(netdev);
885 if (rc)
886 return rc;
887
888 ctrlmode = dev->can.ctrlmode;
889 if (ctrlmode & CAN_CTRLMODE_FD) {
890 if (dev->feature & GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX)
891 dev->hf_size_tx = struct_size(hf, canfd_quirk, 1);
892 else
893 dev->hf_size_tx = struct_size(hf, canfd, 1);
894 } else {
895 if (dev->feature & GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX)
896 dev->hf_size_tx = struct_size(hf, classic_can_quirk, 1);
897 else
898 dev->hf_size_tx = struct_size(hf, classic_can, 1);
899 }
900
901 can_rx_offload_enable(&dev->offload);
902
903 if (!parent->active_channels) {
904 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
905 gs_usb_timestamp_init(parent);
906
907 for (i = 0; i < GS_MAX_RX_URBS; i++) {
908 u8 *buf;
909
910 /* alloc rx urb */
911 urb = usb_alloc_urb(0, GFP_KERNEL);
912 if (!urb) {
913 rc = -ENOMEM;
914 goto out_usb_kill_anchored_urbs;
915 }
916
917 /* alloc rx buffer */
918 buf = kmalloc(dev->parent->hf_size_rx,
919 GFP_KERNEL);
920 if (!buf) {
921 rc = -ENOMEM;
922 goto out_usb_free_urb;
923 }
924
925 /* fill, anchor, and submit rx urb */
926 usb_fill_bulk_urb(urb,
927 dev->udev,
928 usb_rcvbulkpipe(dev->udev,
929 GS_USB_ENDPOINT_IN),
930 buf,
931 dev->parent->hf_size_rx,
932 gs_usb_receive_bulk_callback, parent);
933 urb->transfer_flags |= URB_FREE_BUFFER;
934
935 usb_anchor_urb(urb, &parent->rx_submitted);
936
937 rc = usb_submit_urb(urb, GFP_KERNEL);
938 if (rc) {
939 if (rc == -ENODEV)
940 netif_device_detach(dev->netdev);
941
942 netdev_err(netdev,
943 "usb_submit_urb() failed, error %pe\n",
944 ERR_PTR(rc));
945
946 goto out_usb_unanchor_urb;
947 }
948
949 /* Drop reference,
950 * USB core will take care of freeing it
951 */
952 usb_free_urb(urb);
953 }
954 }
955
956 /* flags */
957 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
958 flags |= GS_CAN_MODE_LOOP_BACK;
959
960 if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
961 flags |= GS_CAN_MODE_LISTEN_ONLY;
962
963 if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
964 flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
965
966 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
967 flags |= GS_CAN_MODE_ONE_SHOT;
968
969 if (ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
970 flags |= GS_CAN_MODE_BERR_REPORTING;
971
972 if (ctrlmode & CAN_CTRLMODE_FD)
973 flags |= GS_CAN_MODE_FD;
974
975 /* if hardware supports timestamps, enable it */
976 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
977 flags |= GS_CAN_MODE_HW_TIMESTAMP;
978
979 /* finally start device */
980 dev->can.state = CAN_STATE_ERROR_ACTIVE;
981 dm.flags = cpu_to_le32(flags);
982 rc = usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_MODE,
983 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
984 dev->channel, 0, &dm, sizeof(dm), 1000,
985 GFP_KERNEL);
986 if (rc) {
987 netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
988 dev->can.state = CAN_STATE_STOPPED;
989
990 goto out_usb_kill_anchored_urbs;
991 }
992
993 parent->active_channels++;
994 if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
995 netif_start_queue(netdev);
996
997 return 0;
998
999 out_usb_unanchor_urb:
1000 usb_unanchor_urb(urb);
1001 out_usb_free_urb:
1002 usb_free_urb(urb);
1003 out_usb_kill_anchored_urbs:
1004 if (!parent->active_channels) {
1005 usb_kill_anchored_urbs(&dev->tx_submitted);
1006
1007 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1008 gs_usb_timestamp_stop(parent);
1009 }
1010
1011 can_rx_offload_disable(&dev->offload);
1012 close_candev(netdev);
1013
1014 return rc;
1015 }
1016
gs_usb_get_state(const struct net_device * netdev,struct can_berr_counter * bec,enum can_state * state)1017 static int gs_usb_get_state(const struct net_device *netdev,
1018 struct can_berr_counter *bec,
1019 enum can_state *state)
1020 {
1021 struct gs_can *dev = netdev_priv(netdev);
1022 struct gs_device_state ds;
1023 int rc;
1024
1025 rc = usb_control_msg_recv(dev->udev, 0, GS_USB_BREQ_GET_STATE,
1026 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1027 dev->channel, 0,
1028 &ds, sizeof(ds),
1029 USB_CTRL_GET_TIMEOUT,
1030 GFP_KERNEL);
1031 if (rc)
1032 return rc;
1033
1034 if (le32_to_cpu(ds.state) >= CAN_STATE_MAX)
1035 return -EOPNOTSUPP;
1036
1037 *state = le32_to_cpu(ds.state);
1038 bec->txerr = le32_to_cpu(ds.txerr);
1039 bec->rxerr = le32_to_cpu(ds.rxerr);
1040
1041 return 0;
1042 }
1043
gs_usb_can_get_berr_counter(const struct net_device * netdev,struct can_berr_counter * bec)1044 static int gs_usb_can_get_berr_counter(const struct net_device *netdev,
1045 struct can_berr_counter *bec)
1046 {
1047 enum can_state state;
1048
1049 return gs_usb_get_state(netdev, bec, &state);
1050 }
1051
gs_can_close(struct net_device * netdev)1052 static int gs_can_close(struct net_device *netdev)
1053 {
1054 int rc;
1055 struct gs_can *dev = netdev_priv(netdev);
1056 struct gs_usb *parent = dev->parent;
1057
1058 netif_stop_queue(netdev);
1059
1060 /* Stop polling */
1061 parent->active_channels--;
1062 if (!parent->active_channels) {
1063 usb_kill_anchored_urbs(&parent->rx_submitted);
1064
1065 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1066 gs_usb_timestamp_stop(parent);
1067 }
1068
1069 /* Stop sending URBs */
1070 usb_kill_anchored_urbs(&dev->tx_submitted);
1071 atomic_set(&dev->active_tx_urbs, 0);
1072
1073 dev->can.state = CAN_STATE_STOPPED;
1074
1075 /* reset the device */
1076 gs_cmd_reset(dev);
1077
1078 /* reset tx contexts */
1079 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
1080 dev->tx_context[rc].dev = dev;
1081 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
1082 }
1083
1084 can_rx_offload_disable(&dev->offload);
1085
1086 /* close the netdev */
1087 close_candev(netdev);
1088
1089 return 0;
1090 }
1091
gs_can_eth_ioctl(struct net_device * netdev,struct ifreq * ifr,int cmd)1092 static int gs_can_eth_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1093 {
1094 const struct gs_can *dev = netdev_priv(netdev);
1095
1096 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1097 return can_eth_ioctl_hwts(netdev, ifr, cmd);
1098
1099 return -EOPNOTSUPP;
1100 }
1101
1102 static const struct net_device_ops gs_usb_netdev_ops = {
1103 .ndo_open = gs_can_open,
1104 .ndo_stop = gs_can_close,
1105 .ndo_start_xmit = gs_can_start_xmit,
1106 .ndo_change_mtu = can_change_mtu,
1107 .ndo_eth_ioctl = gs_can_eth_ioctl,
1108 };
1109
gs_usb_set_identify(struct net_device * netdev,bool do_identify)1110 static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
1111 {
1112 struct gs_can *dev = netdev_priv(netdev);
1113 struct gs_identify_mode imode;
1114
1115 if (do_identify)
1116 imode.mode = cpu_to_le32(GS_CAN_IDENTIFY_ON);
1117 else
1118 imode.mode = cpu_to_le32(GS_CAN_IDENTIFY_OFF);
1119
1120 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_IDENTIFY,
1121 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1122 dev->channel, 0, &imode, sizeof(imode), 100,
1123 GFP_KERNEL);
1124 }
1125
1126 /* blink LED's for finding the this interface */
gs_usb_set_phys_id(struct net_device * netdev,enum ethtool_phys_id_state state)1127 static int gs_usb_set_phys_id(struct net_device *netdev,
1128 enum ethtool_phys_id_state state)
1129 {
1130 const struct gs_can *dev = netdev_priv(netdev);
1131 int rc = 0;
1132
1133 if (!(dev->feature & GS_CAN_FEATURE_IDENTIFY))
1134 return -EOPNOTSUPP;
1135
1136 switch (state) {
1137 case ETHTOOL_ID_ACTIVE:
1138 rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_ON);
1139 break;
1140 case ETHTOOL_ID_INACTIVE:
1141 rc = gs_usb_set_identify(netdev, GS_CAN_IDENTIFY_OFF);
1142 break;
1143 default:
1144 break;
1145 }
1146
1147 return rc;
1148 }
1149
gs_usb_get_ts_info(struct net_device * netdev,struct kernel_ethtool_ts_info * info)1150 static int gs_usb_get_ts_info(struct net_device *netdev,
1151 struct kernel_ethtool_ts_info *info)
1152 {
1153 struct gs_can *dev = netdev_priv(netdev);
1154
1155 /* report if device supports HW timestamps */
1156 if (dev->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1157 return can_ethtool_op_get_ts_info_hwts(netdev, info);
1158
1159 return ethtool_op_get_ts_info(netdev, info);
1160 }
1161
1162 static const struct ethtool_ops gs_usb_ethtool_ops = {
1163 .set_phys_id = gs_usb_set_phys_id,
1164 .get_ts_info = gs_usb_get_ts_info,
1165 };
1166
gs_usb_get_termination(struct net_device * netdev,u16 * term)1167 static int gs_usb_get_termination(struct net_device *netdev, u16 *term)
1168 {
1169 struct gs_can *dev = netdev_priv(netdev);
1170 struct gs_device_termination_state term_state;
1171 int rc;
1172
1173 rc = usb_control_msg_recv(dev->udev, 0, GS_USB_BREQ_GET_TERMINATION,
1174 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1175 dev->channel, 0,
1176 &term_state, sizeof(term_state), 1000,
1177 GFP_KERNEL);
1178 if (rc)
1179 return rc;
1180
1181 if (term_state.state == cpu_to_le32(GS_CAN_TERMINATION_STATE_ON))
1182 *term = GS_USB_TERMINATION_ENABLED;
1183 else
1184 *term = GS_USB_TERMINATION_DISABLED;
1185
1186 return 0;
1187 }
1188
gs_usb_set_termination(struct net_device * netdev,u16 term)1189 static int gs_usb_set_termination(struct net_device *netdev, u16 term)
1190 {
1191 struct gs_can *dev = netdev_priv(netdev);
1192 struct gs_device_termination_state term_state;
1193
1194 if (term == GS_USB_TERMINATION_ENABLED)
1195 term_state.state = cpu_to_le32(GS_CAN_TERMINATION_STATE_ON);
1196 else
1197 term_state.state = cpu_to_le32(GS_CAN_TERMINATION_STATE_OFF);
1198
1199 return usb_control_msg_send(dev->udev, 0, GS_USB_BREQ_SET_TERMINATION,
1200 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1201 dev->channel, 0,
1202 &term_state, sizeof(term_state), 1000,
1203 GFP_KERNEL);
1204 }
1205
1206 static const u16 gs_usb_termination_const[] = {
1207 GS_USB_TERMINATION_DISABLED,
1208 GS_USB_TERMINATION_ENABLED
1209 };
1210
gs_make_candev(unsigned int channel,struct usb_interface * intf,struct gs_device_config * dconf)1211 static struct gs_can *gs_make_candev(unsigned int channel,
1212 struct usb_interface *intf,
1213 struct gs_device_config *dconf)
1214 {
1215 struct gs_can *dev;
1216 struct net_device *netdev;
1217 int rc;
1218 struct gs_device_bt_const_extended bt_const_extended;
1219 struct gs_device_bt_const bt_const;
1220 u32 feature;
1221
1222 /* fetch bit timing constants */
1223 rc = usb_control_msg_recv(interface_to_usbdev(intf), 0,
1224 GS_USB_BREQ_BT_CONST,
1225 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1226 channel, 0, &bt_const, sizeof(bt_const), 1000,
1227 GFP_KERNEL);
1228
1229 if (rc) {
1230 dev_err(&intf->dev,
1231 "Couldn't get bit timing const for channel %d (%pe)\n",
1232 channel, ERR_PTR(rc));
1233 return ERR_PTR(rc);
1234 }
1235
1236 /* create netdev */
1237 netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
1238 if (!netdev) {
1239 dev_err(&intf->dev, "Couldn't allocate candev\n");
1240 return ERR_PTR(-ENOMEM);
1241 }
1242
1243 dev = netdev_priv(netdev);
1244
1245 netdev->netdev_ops = &gs_usb_netdev_ops;
1246 netdev->ethtool_ops = &gs_usb_ethtool_ops;
1247
1248 netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
1249 netdev->dev_id = channel;
1250
1251 /* dev setup */
1252 strcpy(dev->bt_const.name, KBUILD_MODNAME);
1253 dev->bt_const.tseg1_min = le32_to_cpu(bt_const.tseg1_min);
1254 dev->bt_const.tseg1_max = le32_to_cpu(bt_const.tseg1_max);
1255 dev->bt_const.tseg2_min = le32_to_cpu(bt_const.tseg2_min);
1256 dev->bt_const.tseg2_max = le32_to_cpu(bt_const.tseg2_max);
1257 dev->bt_const.sjw_max = le32_to_cpu(bt_const.sjw_max);
1258 dev->bt_const.brp_min = le32_to_cpu(bt_const.brp_min);
1259 dev->bt_const.brp_max = le32_to_cpu(bt_const.brp_max);
1260 dev->bt_const.brp_inc = le32_to_cpu(bt_const.brp_inc);
1261
1262 dev->udev = interface_to_usbdev(intf);
1263 dev->netdev = netdev;
1264 dev->channel = channel;
1265
1266 init_usb_anchor(&dev->tx_submitted);
1267 atomic_set(&dev->active_tx_urbs, 0);
1268 spin_lock_init(&dev->tx_ctx_lock);
1269 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
1270 dev->tx_context[rc].dev = dev;
1271 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
1272 }
1273
1274 /* can setup */
1275 dev->can.state = CAN_STATE_STOPPED;
1276 dev->can.clock.freq = le32_to_cpu(bt_const.fclk_can);
1277 dev->can.bittiming_const = &dev->bt_const;
1278 dev->can.do_set_bittiming = gs_usb_set_bittiming;
1279
1280 dev->can.ctrlmode_supported = CAN_CTRLMODE_CC_LEN8_DLC;
1281
1282 feature = le32_to_cpu(bt_const.feature);
1283 dev->feature = FIELD_GET(GS_CAN_FEATURE_MASK, feature);
1284 if (feature & GS_CAN_FEATURE_LISTEN_ONLY)
1285 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1286
1287 if (feature & GS_CAN_FEATURE_LOOP_BACK)
1288 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
1289
1290 if (feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
1291 dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1292
1293 if (feature & GS_CAN_FEATURE_ONE_SHOT)
1294 dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
1295
1296 if (feature & GS_CAN_FEATURE_FD) {
1297 dev->can.ctrlmode_supported |= CAN_CTRLMODE_FD;
1298 /* The data bit timing will be overwritten, if
1299 * GS_CAN_FEATURE_BT_CONST_EXT is set.
1300 */
1301 dev->can.data_bittiming_const = &dev->bt_const;
1302 dev->can.do_set_data_bittiming = gs_usb_set_data_bittiming;
1303 }
1304
1305 if (feature & GS_CAN_FEATURE_TERMINATION) {
1306 rc = gs_usb_get_termination(netdev, &dev->can.termination);
1307 if (rc) {
1308 dev->feature &= ~GS_CAN_FEATURE_TERMINATION;
1309
1310 dev_info(&intf->dev,
1311 "Disabling termination support for channel %d (%pe)\n",
1312 channel, ERR_PTR(rc));
1313 } else {
1314 dev->can.termination_const = gs_usb_termination_const;
1315 dev->can.termination_const_cnt = ARRAY_SIZE(gs_usb_termination_const);
1316 dev->can.do_set_termination = gs_usb_set_termination;
1317 }
1318 }
1319
1320 if (feature & GS_CAN_FEATURE_BERR_REPORTING)
1321 dev->can.ctrlmode_supported |= CAN_CTRLMODE_BERR_REPORTING;
1322
1323 if (feature & GS_CAN_FEATURE_GET_STATE)
1324 dev->can.do_get_berr_counter = gs_usb_can_get_berr_counter;
1325
1326 /* The CANtact Pro from LinkLayer Labs is based on the
1327 * LPC54616 µC, which is affected by the NXP LPC USB transfer
1328 * erratum. However, the current firmware (version 2) doesn't
1329 * set the GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX bit. Set the
1330 * feature GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX to workaround
1331 * this issue.
1332 *
1333 * For the GS_USB_BREQ_DATA_BITTIMING USB control message the
1334 * CANtact Pro firmware uses a request value, which is already
1335 * used by the candleLight firmware for a different purpose
1336 * (GS_USB_BREQ_GET_USER_ID). Set the feature
1337 * GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO to workaround this
1338 * issue.
1339 */
1340 if (dev->udev->descriptor.idVendor == cpu_to_le16(USB_GS_USB_1_VENDOR_ID) &&
1341 dev->udev->descriptor.idProduct == cpu_to_le16(USB_GS_USB_1_PRODUCT_ID) &&
1342 dev->udev->manufacturer && dev->udev->product &&
1343 !strcmp(dev->udev->manufacturer, "LinkLayer Labs") &&
1344 !strcmp(dev->udev->product, "CANtact Pro") &&
1345 (le32_to_cpu(dconf->sw_version) <= 2))
1346 dev->feature |= GS_CAN_FEATURE_REQ_USB_QUIRK_LPC546XX |
1347 GS_CAN_FEATURE_QUIRK_BREQ_CANTACT_PRO;
1348
1349 /* GS_CAN_FEATURE_IDENTIFY is only supported for sw_version > 1 */
1350 if (!(le32_to_cpu(dconf->sw_version) > 1 &&
1351 feature & GS_CAN_FEATURE_IDENTIFY))
1352 dev->feature &= ~GS_CAN_FEATURE_IDENTIFY;
1353
1354 /* fetch extended bit timing constants if device has feature
1355 * GS_CAN_FEATURE_FD and GS_CAN_FEATURE_BT_CONST_EXT
1356 */
1357 if (feature & GS_CAN_FEATURE_FD &&
1358 feature & GS_CAN_FEATURE_BT_CONST_EXT) {
1359 rc = usb_control_msg_recv(interface_to_usbdev(intf), 0,
1360 GS_USB_BREQ_BT_CONST_EXT,
1361 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1362 channel, 0, &bt_const_extended,
1363 sizeof(bt_const_extended),
1364 1000, GFP_KERNEL);
1365 if (rc) {
1366 dev_err(&intf->dev,
1367 "Couldn't get extended bit timing const for channel %d (%pe)\n",
1368 channel, ERR_PTR(rc));
1369 goto out_free_candev;
1370 }
1371
1372 strcpy(dev->data_bt_const.name, KBUILD_MODNAME);
1373 dev->data_bt_const.tseg1_min = le32_to_cpu(bt_const_extended.dtseg1_min);
1374 dev->data_bt_const.tseg1_max = le32_to_cpu(bt_const_extended.dtseg1_max);
1375 dev->data_bt_const.tseg2_min = le32_to_cpu(bt_const_extended.dtseg2_min);
1376 dev->data_bt_const.tseg2_max = le32_to_cpu(bt_const_extended.dtseg2_max);
1377 dev->data_bt_const.sjw_max = le32_to_cpu(bt_const_extended.dsjw_max);
1378 dev->data_bt_const.brp_min = le32_to_cpu(bt_const_extended.dbrp_min);
1379 dev->data_bt_const.brp_max = le32_to_cpu(bt_const_extended.dbrp_max);
1380 dev->data_bt_const.brp_inc = le32_to_cpu(bt_const_extended.dbrp_inc);
1381
1382 dev->can.data_bittiming_const = &dev->data_bt_const;
1383 }
1384
1385 can_rx_offload_add_manual(netdev, &dev->offload, GS_NAPI_WEIGHT);
1386 SET_NETDEV_DEV(netdev, &intf->dev);
1387
1388 rc = register_candev(dev->netdev);
1389 if (rc) {
1390 dev_err(&intf->dev,
1391 "Couldn't register candev for channel %d (%pe)\n",
1392 channel, ERR_PTR(rc));
1393 goto out_can_rx_offload_del;
1394 }
1395
1396 return dev;
1397
1398 out_can_rx_offload_del:
1399 can_rx_offload_del(&dev->offload);
1400 out_free_candev:
1401 free_candev(dev->netdev);
1402 return ERR_PTR(rc);
1403 }
1404
gs_destroy_candev(struct gs_can * dev)1405 static void gs_destroy_candev(struct gs_can *dev)
1406 {
1407 unregister_candev(dev->netdev);
1408 can_rx_offload_del(&dev->offload);
1409 free_candev(dev->netdev);
1410 }
1411
gs_usb_probe(struct usb_interface * intf,const struct usb_device_id * id)1412 static int gs_usb_probe(struct usb_interface *intf,
1413 const struct usb_device_id *id)
1414 {
1415 struct usb_device *udev = interface_to_usbdev(intf);
1416 struct gs_host_frame *hf;
1417 struct gs_usb *parent;
1418 struct gs_host_config hconf = {
1419 .byte_order = cpu_to_le32(0x0000beef),
1420 };
1421 struct gs_device_config dconf;
1422 unsigned int icount, i;
1423 int rc;
1424
1425 /* send host config */
1426 rc = usb_control_msg_send(udev, 0,
1427 GS_USB_BREQ_HOST_FORMAT,
1428 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1429 1, intf->cur_altsetting->desc.bInterfaceNumber,
1430 &hconf, sizeof(hconf), 1000,
1431 GFP_KERNEL);
1432 if (rc) {
1433 dev_err(&intf->dev, "Couldn't send data format (err=%d)\n", rc);
1434 return rc;
1435 }
1436
1437 /* read device config */
1438 rc = usb_control_msg_recv(udev, 0,
1439 GS_USB_BREQ_DEVICE_CONFIG,
1440 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
1441 1, intf->cur_altsetting->desc.bInterfaceNumber,
1442 &dconf, sizeof(dconf), 1000,
1443 GFP_KERNEL);
1444 if (rc) {
1445 dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
1446 rc);
1447 return rc;
1448 }
1449
1450 icount = dconf.icount + 1;
1451 dev_info(&intf->dev, "Configuring for %u interfaces\n", icount);
1452
1453 if (icount > GS_MAX_INTF) {
1454 dev_err(&intf->dev,
1455 "Driver cannot handle more that %u CAN interfaces\n",
1456 GS_MAX_INTF);
1457 return -EINVAL;
1458 }
1459
1460 parent = kzalloc(sizeof(*parent), GFP_KERNEL);
1461 if (!parent)
1462 return -ENOMEM;
1463
1464 init_usb_anchor(&parent->rx_submitted);
1465
1466 usb_set_intfdata(intf, parent);
1467 parent->udev = udev;
1468
1469 for (i = 0; i < icount; i++) {
1470 unsigned int hf_size_rx = 0;
1471
1472 parent->canch[i] = gs_make_candev(i, intf, &dconf);
1473 if (IS_ERR_OR_NULL(parent->canch[i])) {
1474 /* save error code to return later */
1475 rc = PTR_ERR(parent->canch[i]);
1476
1477 /* on failure destroy previously created candevs */
1478 icount = i;
1479 for (i = 0; i < icount; i++)
1480 gs_destroy_candev(parent->canch[i]);
1481
1482 usb_kill_anchored_urbs(&parent->rx_submitted);
1483 kfree(parent);
1484 return rc;
1485 }
1486 parent->canch[i]->parent = parent;
1487
1488 /* set RX packet size based on FD and if hardware
1489 * timestamps are supported.
1490 */
1491 if (parent->canch[i]->can.ctrlmode_supported & CAN_CTRLMODE_FD) {
1492 if (parent->canch[i]->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1493 hf_size_rx = struct_size(hf, canfd_ts, 1);
1494 else
1495 hf_size_rx = struct_size(hf, canfd, 1);
1496 } else {
1497 if (parent->canch[i]->feature & GS_CAN_FEATURE_HW_TIMESTAMP)
1498 hf_size_rx = struct_size(hf, classic_can_ts, 1);
1499 else
1500 hf_size_rx = struct_size(hf, classic_can, 1);
1501 }
1502 parent->hf_size_rx = max(parent->hf_size_rx, hf_size_rx);
1503 }
1504
1505 return 0;
1506 }
1507
gs_usb_disconnect(struct usb_interface * intf)1508 static void gs_usb_disconnect(struct usb_interface *intf)
1509 {
1510 struct gs_usb *parent = usb_get_intfdata(intf);
1511 unsigned int i;
1512
1513 usb_set_intfdata(intf, NULL);
1514
1515 if (!parent) {
1516 dev_err(&intf->dev, "Disconnect (nodata)\n");
1517 return;
1518 }
1519
1520 for (i = 0; i < GS_MAX_INTF; i++)
1521 if (parent->canch[i])
1522 gs_destroy_candev(parent->canch[i]);
1523
1524 kfree(parent);
1525 }
1526
1527 static const struct usb_device_id gs_usb_table[] = {
1528 { USB_DEVICE_INTERFACE_NUMBER(USB_GS_USB_1_VENDOR_ID,
1529 USB_GS_USB_1_PRODUCT_ID, 0) },
1530 { USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
1531 USB_CANDLELIGHT_PRODUCT_ID, 0) },
1532 { USB_DEVICE_INTERFACE_NUMBER(USB_CES_CANEXT_FD_VENDOR_ID,
1533 USB_CES_CANEXT_FD_PRODUCT_ID, 0) },
1534 { USB_DEVICE_INTERFACE_NUMBER(USB_ABE_CANDEBUGGER_FD_VENDOR_ID,
1535 USB_ABE_CANDEBUGGER_FD_PRODUCT_ID, 0) },
1536 { USB_DEVICE_INTERFACE_NUMBER(USB_XYLANTA_SAINT3_VENDOR_ID,
1537 USB_XYLANTA_SAINT3_PRODUCT_ID, 0) },
1538 {} /* Terminating entry */
1539 };
1540
1541 MODULE_DEVICE_TABLE(usb, gs_usb_table);
1542
1543 static struct usb_driver gs_usb_driver = {
1544 .name = KBUILD_MODNAME,
1545 .probe = gs_usb_probe,
1546 .disconnect = gs_usb_disconnect,
1547 .id_table = gs_usb_table,
1548 };
1549
1550 module_usb_driver(gs_usb_driver);
1551
1552 MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
1553 MODULE_DESCRIPTION(
1554 "Socket CAN device driver for Geschwister Schneider Technologie-, "
1555 "Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
1556 "and bytewerk.org candleLight USB CAN interfaces.");
1557 MODULE_LICENSE("GPL v2");
1558