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Merge branch 'bind_unbind' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / net / can / usb / gs_usb.c
CommitLineData
f155d9c0
MS		 1/* CAN driver for Geschwister Schneider USB/CAN devices
2 * and bytewerk.org candleLight USB CAN interfaces.
d08e973a 3 *
f155d9c0 4 * Copyright (C) 2013-2016 Geschwister Schneider Technologie-,
d08e973a 5 * Entwicklungs- und Vertriebs UG (Haftungsbeschränkt).
f155d9c0 6 * Copyright (C) 2016 Hubert Denkmair
d08e973a
MS		 7 *
8 * Many thanks to all socketcan devs!
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 */
19
20#include <linux/init.h>
21#include <linux/signal.h>
22#include <linux/module.h>
23#include <linux/netdevice.h>
24#include <linux/usb.h>
25
26#include <linux/can.h>
27#include <linux/can/dev.h>
28#include <linux/can/error.h>
29
30/* Device specific constants */
31#define USB_GSUSB_1_VENDOR_ID 0x1d50
32#define USB_GSUSB_1_PRODUCT_ID 0x606f
33
f155d9c0
MS		 34#define USB_CANDLELIGHT_VENDOR_ID 0x1209
35#define USB_CANDLELIGHT_PRODUCT_ID 0x2323
36
d08e973a
MS		 37#define GSUSB_ENDPOINT_IN 1
38#define GSUSB_ENDPOINT_OUT 2
39
40/* Device specific constants */
41enum gs_usb_breq {
42 GS_USB_BREQ_HOST_FORMAT = 0,
43 GS_USB_BREQ_BITTIMING,
44 GS_USB_BREQ_MODE,
45 GS_USB_BREQ_BERR,
46 GS_USB_BREQ_BT_CONST,
05ca5270
MS		 47 GS_USB_BREQ_DEVICE_CONFIG,
48 GS_USB_BREQ_TIMESTAMP,
49 GS_USB_BREQ_IDENTIFY,
d08e973a
MS		 50};
51
52enum gs_can_mode {
53 /* reset a channel. turns it off */
54 GS_CAN_MODE_RESET = 0,
55 /* starts a channel */
56 GS_CAN_MODE_START
57};
58
59enum gs_can_state {
60 GS_CAN_STATE_ERROR_ACTIVE = 0,
61 GS_CAN_STATE_ERROR_WARNING,
62 GS_CAN_STATE_ERROR_PASSIVE,
63 GS_CAN_STATE_BUS_OFF,
64 GS_CAN_STATE_STOPPED,
65 GS_CAN_STATE_SLEEPING
66};
67
05ca5270
MS		 68enum gs_can_identify_mode {
69 GS_CAN_IDENTIFY_OFF = 0,
70 GS_CAN_IDENTIFY_ON
71};
72
d08e973a
MS		 73/* data types passed between host and device */
74struct gs_host_config {
75 u32 byte_order;
76} __packed;
77/* All data exchanged between host and device is exchanged in host byte order,
78 * thanks to the struct gs_host_config byte_order member, which is sent first
79 * to indicate the desired byte order.
80 */
81
82struct gs_device_config {
83 u8 reserved1;
84 u8 reserved2;
85 u8 reserved3;
86 u8 icount;
87 u32 sw_version;
88 u32 hw_version;
89} __packed;
90
91#define GS_CAN_MODE_NORMAL 0
9be95c91
MS		 92#define GS_CAN_MODE_LISTEN_ONLY BIT(0)
93#define GS_CAN_MODE_LOOP_BACK BIT(1)
94#define GS_CAN_MODE_TRIPLE_SAMPLE BIT(2)
95#define GS_CAN_MODE_ONE_SHOT BIT(3)
d08e973a
MS		 96
97struct gs_device_mode {
98 u32 mode;
99 u32 flags;
100} __packed;
101
102struct gs_device_state {
103 u32 state;
104 u32 rxerr;
105 u32 txerr;
106} __packed;
107
108struct gs_device_bittiming {
109 u32 prop_seg;
110 u32 phase_seg1;
111 u32 phase_seg2;
112 u32 sjw;
113 u32 brp;
114} __packed;
115
05ca5270
MS		 116struct gs_identify_mode {
117 u32 mode;
118} __packed;
119
9be95c91
MS		 120#define GS_CAN_FEATURE_LISTEN_ONLY BIT(0)
121#define GS_CAN_FEATURE_LOOP_BACK BIT(1)
122#define GS_CAN_FEATURE_TRIPLE_SAMPLE BIT(2)
123#define GS_CAN_FEATURE_ONE_SHOT BIT(3)
05ca5270
MS		 124#define GS_CAN_FEATURE_HW_TIMESTAMP BIT(4)
125#define GS_CAN_FEATURE_IDENTIFY BIT(5)
d08e973a
MS		 126
127struct gs_device_bt_const {
128 u32 feature;
129 u32 fclk_can;
130 u32 tseg1_min;
131 u32 tseg1_max;
132 u32 tseg2_min;
133 u32 tseg2_max;
134 u32 sjw_max;
135 u32 brp_min;
136 u32 brp_max;
137 u32 brp_inc;
138} __packed;
139
140#define GS_CAN_FLAG_OVERFLOW 1
141
142struct gs_host_frame {
143 u32 echo_id;
144 u32 can_id;
145
146 u8 can_dlc;
147 u8 channel;
148 u8 flags;
149 u8 reserved;
150
151 u8 data[8];
152} __packed;
153/* The GS USB devices make use of the same flags and masks as in
154 * linux/can.h and linux/can/error.h, and no additional mapping is necessary.
155 */
156
157/* Only send a max of GS_MAX_TX_URBS frames per channel at a time. */
158#define GS_MAX_TX_URBS 10
159/* Only launch a max of GS_MAX_RX_URBS usb requests at a time. */
160#define GS_MAX_RX_URBS 30
161/* Maximum number of interfaces the driver supports per device.
162 * Current hardware only supports 2 interfaces. The future may vary.
163 */
164#define GS_MAX_INTF 2
165
166struct gs_tx_context {
167 struct gs_can *dev;
168 unsigned int echo_id;
169};
170
171struct gs_can {
172 struct can_priv can; /* must be the first member */
173
174 struct gs_usb *parent;
175
176 struct net_device *netdev;
177 struct usb_device *udev;
178 struct usb_interface *iface;
179
180 struct can_bittiming_const bt_const;
181 unsigned int channel; /* channel number */
182
ae421e33 183 /* This lock prevents a race condition between xmit and receive. */
d08e973a
MS		 184 spinlock_t tx_ctx_lock;
185 struct gs_tx_context tx_context[GS_MAX_TX_URBS];
186
187 struct usb_anchor tx_submitted;
188 atomic_t active_tx_urbs;
189};
190
191/* usb interface struct */
192struct gs_usb {
193 struct gs_can *canch[GS_MAX_INTF];
194 struct usb_anchor rx_submitted;
195 atomic_t active_channels;
196 struct usb_device *udev;
197};
198
199/* 'allocate' a tx context.
200 * returns a valid tx context or NULL if there is no space.
201 */
202static struct gs_tx_context *gs_alloc_tx_context(struct gs_can *dev)
203{
204 int i = 0;
205 unsigned long flags;
206
207 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
208
209 for (; i < GS_MAX_TX_URBS; i++) {
210 if (dev->tx_context[i].echo_id == GS_MAX_TX_URBS) {
211 dev->tx_context[i].echo_id = i;
212 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
213 return &dev->tx_context[i];
214 }
215 }
216
217 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
218 return NULL;
219}
220
221/* releases a tx context
222 */
223static void gs_free_tx_context(struct gs_tx_context *txc)
224{
225 txc->echo_id = GS_MAX_TX_URBS;
226}
227
228/* Get a tx context by id.
229 */
9be95c91
MS		 230static struct gs_tx_context *gs_get_tx_context(struct gs_can *dev,
231 unsigned int id)
d08e973a
MS		 232{
233 unsigned long flags;
234
235 if (id < GS_MAX_TX_URBS) {
236 spin_lock_irqsave(&dev->tx_ctx_lock, flags);
237 if (dev->tx_context[id].echo_id == id) {
238 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
239 return &dev->tx_context[id];
240 }
241 spin_unlock_irqrestore(&dev->tx_ctx_lock, flags);
242 }
243 return NULL;
244}
245
246static int gs_cmd_reset(struct gs_usb *gsusb, struct gs_can *gsdev)
247{
248 struct gs_device_mode *dm;
249 struct usb_interface *intf = gsdev->iface;
250 int rc;
251
252 dm = kzalloc(sizeof(*dm), GFP_KERNEL);
253 if (!dm)
254 return -ENOMEM;
255
256 dm->mode = GS_CAN_MODE_RESET;
257
258 rc = usb_control_msg(interface_to_usbdev(intf),
259 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
260 GS_USB_BREQ_MODE,
540a27ae 261 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
d08e973a
MS		 262 gsdev->channel,
263 0,
264 dm,
265 sizeof(*dm),
266 1000);
267
5cda3ee5
MKB		 268 kfree(dm);
269
d08e973a
MS		 270 return rc;
271}
272
273static void gs_update_state(struct gs_can *dev, struct can_frame *cf)
274{
275 struct can_device_stats *can_stats = &dev->can.can_stats;
276
277 if (cf->can_id & CAN_ERR_RESTARTED) {
278 dev->can.state = CAN_STATE_ERROR_ACTIVE;
279 can_stats->restarts++;
280 } else if (cf->can_id & CAN_ERR_BUSOFF) {
281 dev->can.state = CAN_STATE_BUS_OFF;
282 can_stats->bus_off++;
283 } else if (cf->can_id & CAN_ERR_CRTL) {
284 if ((cf->data[1] & CAN_ERR_CRTL_TX_WARNING) ||
285 (cf->data[1] & CAN_ERR_CRTL_RX_WARNING)) {
286 dev->can.state = CAN_STATE_ERROR_WARNING;
287 can_stats->error_warning++;
288 } else if ((cf->data[1] & CAN_ERR_CRTL_TX_PASSIVE) ||
289 (cf->data[1] & CAN_ERR_CRTL_RX_PASSIVE)) {
290 dev->can.state = CAN_STATE_ERROR_PASSIVE;
291 can_stats->error_passive++;
292 } else {
293 dev->can.state = CAN_STATE_ERROR_ACTIVE;
294 }
295 }
296}
297
ae421e33 298static void gs_usb_receive_bulk_callback(struct urb *urb)
d08e973a
MS		 299{
300 struct gs_usb *usbcan = urb->context;
301 struct gs_can *dev;
302 struct net_device *netdev;
303 int rc;
304 struct net_device_stats *stats;
305 struct gs_host_frame *hf = urb->transfer_buffer;
306 struct gs_tx_context *txc;
307 struct can_frame *cf;
308 struct sk_buff *skb;
309
310 BUG_ON(!usbcan);
311
312 switch (urb->status) {
313 case 0: /* success */
314 break;
315 case -ENOENT:
316 case -ESHUTDOWN:
317 return;
318 default:
319 /* do not resubmit aborted urbs. eg: when device goes down */
320 return;
321 }
322
323 /* device reports out of range channel id */
324 if (hf->channel >= GS_MAX_INTF)
325 goto resubmit_urb;
326
327 dev = usbcan->canch[hf->channel];
328
329 netdev = dev->netdev;
330 stats = &netdev->stats;
331
332 if (!netif_device_present(netdev))
333 return;
334
335 if (hf->echo_id == -1) { /* normal rx */
336 skb = alloc_can_skb(dev->netdev, &cf);
337 if (!skb)
338 return;
339
340 cf->can_id = hf->can_id;
341
342 cf->can_dlc = get_can_dlc(hf->can_dlc);
343 memcpy(cf->data, hf->data, 8);
344
345 /* ERROR frames tell us information about the controller */
346 if (hf->can_id & CAN_ERR_FLAG)
347 gs_update_state(dev, cf);
348
349 netdev->stats.rx_packets++;
350 netdev->stats.rx_bytes += hf->can_dlc;
351
352 netif_rx(skb);
353 } else { /* echo_id == hf->echo_id */
354 if (hf->echo_id >= GS_MAX_TX_URBS) {
355 netdev_err(netdev,
356 "Unexpected out of range echo id %d\n",
357 hf->echo_id);
358 goto resubmit_urb;
359 }
360
361 netdev->stats.tx_packets++;
362 netdev->stats.tx_bytes += hf->can_dlc;
363
364 txc = gs_get_tx_context(dev, hf->echo_id);
365
366 /* bad devices send bad echo_ids. */
367 if (!txc) {
368 netdev_err(netdev,
369 "Unexpected unused echo id %d\n",
370 hf->echo_id);
371 goto resubmit_urb;
372 }
373
374 can_get_echo_skb(netdev, hf->echo_id);
375
376 gs_free_tx_context(txc);
377
378 netif_wake_queue(netdev);
379 }
380
381 if (hf->flags & GS_CAN_FLAG_OVERFLOW) {
382 skb = alloc_can_err_skb(netdev, &cf);
383 if (!skb)
384 goto resubmit_urb;
385
386 cf->can_id |= CAN_ERR_CRTL;
387 cf->can_dlc = CAN_ERR_DLC;
388 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
389 stats->rx_over_errors++;
390 stats->rx_errors++;
391 netif_rx(skb);
392 }
393
394 resubmit_urb:
395 usb_fill_bulk_urb(urb,
396 usbcan->udev,
397 usb_rcvbulkpipe(usbcan->udev, GSUSB_ENDPOINT_IN),
398 hf,
399 sizeof(struct gs_host_frame),
ae421e33 400 gs_usb_receive_bulk_callback,
d08e973a
MS		 401 usbcan
402 );
403
404 rc = usb_submit_urb(urb, GFP_ATOMIC);
405
406 /* USB failure take down all interfaces */
407 if (rc == -ENODEV) {
408 for (rc = 0; rc < GS_MAX_INTF; rc++) {
409 if (usbcan->canch[rc])
410 netif_device_detach(usbcan->canch[rc]->netdev);
411 }
412 }
413}
414
415static int gs_usb_set_bittiming(struct net_device *netdev)
416{
417 struct gs_can *dev = netdev_priv(netdev);
418 struct can_bittiming *bt = &dev->can.bittiming;
419 struct usb_interface *intf = dev->iface;
420 int rc;
421 struct gs_device_bittiming *dbt;
422
423 dbt = kmalloc(sizeof(*dbt), GFP_KERNEL);
424 if (!dbt)
425 return -ENOMEM;
426
427 dbt->prop_seg = bt->prop_seg;
428 dbt->phase_seg1 = bt->phase_seg1;
429 dbt->phase_seg2 = bt->phase_seg2;
430 dbt->sjw = bt->sjw;
431 dbt->brp = bt->brp;
432
433 /* request bit timings */
434 rc = usb_control_msg(interface_to_usbdev(intf),
435 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
436 GS_USB_BREQ_BITTIMING,
540a27ae 437 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
d08e973a
MS		 438 dev->channel,
439 0,
440 dbt,
441 sizeof(*dbt),
442 1000);
443
444 kfree(dbt);
445
446 if (rc < 0)
447 dev_err(netdev->dev.parent, "Couldn't set bittimings (err=%d)",
448 rc);
449
450 return rc;
451}
452
453static void gs_usb_xmit_callback(struct urb *urb)
454{
455 struct gs_tx_context *txc = urb->context;
456 struct gs_can *dev = txc->dev;
457 struct net_device *netdev = dev->netdev;
458
459 if (urb->status)
460 netdev_info(netdev, "usb xmit fail %d\n", txc->echo_id);
461
462 usb_free_coherent(urb->dev,
463 urb->transfer_buffer_length,
464 urb->transfer_buffer,
465 urb->transfer_dma);
466
467 atomic_dec(&dev->active_tx_urbs);
468
469 if (!netif_device_present(netdev))
470 return;
471
472 if (netif_queue_stopped(netdev))
473 netif_wake_queue(netdev);
474}
475
9be95c91
MS		 476static netdev_tx_t gs_can_start_xmit(struct sk_buff *skb,
477 struct net_device *netdev)
d08e973a
MS		 478{
479 struct gs_can *dev = netdev_priv(netdev);
480 struct net_device_stats *stats = &dev->netdev->stats;
481 struct urb *urb;
482 struct gs_host_frame *hf;
483 struct can_frame *cf;
484 int rc;
485 unsigned int idx;
486 struct gs_tx_context *txc;
487
488 if (can_dropped_invalid_skb(netdev, skb))
489 return NETDEV_TX_OK;
490
491 /* find an empty context to keep track of transmission */
492 txc = gs_alloc_tx_context(dev);
493 if (!txc)
494 return NETDEV_TX_BUSY;
495
496 /* create a URB, and a buffer for it */
497 urb = usb_alloc_urb(0, GFP_ATOMIC);
2a4a1e40 498 if (!urb)
d08e973a 499 goto nomem_urb;
d08e973a
MS		 500
501 hf = usb_alloc_coherent(dev->udev, sizeof(*hf), GFP_ATOMIC,
502 &urb->transfer_dma);
503 if (!hf) {
504 netdev_err(netdev, "No memory left for USB buffer\n");
505 goto nomem_hf;
506 }
507
508 idx = txc->echo_id;
509
510 if (idx >= GS_MAX_TX_URBS) {
511 netdev_err(netdev, "Invalid tx context %d\n", idx);
512 goto badidx;
513 }
514
515 hf->echo_id = idx;
516 hf->channel = dev->channel;
517
518 cf = (struct can_frame *)skb->data;
519
520 hf->can_id = cf->can_id;
521 hf->can_dlc = cf->can_dlc;
522 memcpy(hf->data, cf->data, cf->can_dlc);
523
524 usb_fill_bulk_urb(urb, dev->udev,
525 usb_sndbulkpipe(dev->udev, GSUSB_ENDPOINT_OUT),
526 hf,
527 sizeof(*hf),
528 gs_usb_xmit_callback,
529 txc);
530
531 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
532 usb_anchor_urb(urb, &dev->tx_submitted);
533
534 can_put_echo_skb(skb, netdev, idx);
535
536 atomic_inc(&dev->active_tx_urbs);
537
538 rc = usb_submit_urb(urb, GFP_ATOMIC);
539 if (unlikely(rc)) { /* usb send failed */
540 atomic_dec(&dev->active_tx_urbs);
541
542 can_free_echo_skb(netdev, idx);
543 gs_free_tx_context(txc);
544
545 usb_unanchor_urb(urb);
546 usb_free_coherent(dev->udev,
547 sizeof(*hf),
548 hf,
549 urb->transfer_dma);
550
d08e973a
MS		 551 if (rc == -ENODEV) {
552 netif_device_detach(netdev);
553 } else {
554 netdev_err(netdev, "usb_submit failed (err=%d)\n", rc);
555 stats->tx_dropped++;
556 }
557 } else {
558 /* Slow down tx path */
559 if (atomic_read(&dev->active_tx_urbs) >= GS_MAX_TX_URBS)
560 netif_stop_queue(netdev);
561 }
562
563 /* let usb core take care of this urb */
564 usb_free_urb(urb);
565
566 return NETDEV_TX_OK;
567
568 badidx:
569 usb_free_coherent(dev->udev,
570 sizeof(*hf),
571 hf,
572 urb->transfer_dma);
573 nomem_hf:
574 usb_free_urb(urb);
575
576 nomem_urb:
577 gs_free_tx_context(txc);
578 dev_kfree_skb(skb);
579 stats->tx_dropped++;
580 return NETDEV_TX_OK;
581}
582
583static int gs_can_open(struct net_device *netdev)
584{
585 struct gs_can *dev = netdev_priv(netdev);
586 struct gs_usb *parent = dev->parent;
587 int rc, i;
588 struct gs_device_mode *dm;
589 u32 ctrlmode;
590
591 rc = open_candev(netdev);
592 if (rc)
593 return rc;
594
595 if (atomic_add_return(1, &parent->active_channels) == 1) {
596 for (i = 0; i < GS_MAX_RX_URBS; i++) {
597 struct urb *urb;
598 u8 *buf;
599
600 /* alloc rx urb */
601 urb = usb_alloc_urb(0, GFP_KERNEL);
2a4a1e40 602 if (!urb)
d08e973a 603 return -ENOMEM;
d08e973a
MS		 604
605 /* alloc rx buffer */
606 buf = usb_alloc_coherent(dev->udev,
607 sizeof(struct gs_host_frame),
608 GFP_KERNEL,
609 &urb->transfer_dma);
610 if (!buf) {
611 netdev_err(netdev,
612 "No memory left for USB buffer\n");
613 usb_free_urb(urb);
614 return -ENOMEM;
615 }
616
617 /* fill, anchor, and submit rx urb */
618 usb_fill_bulk_urb(urb,
619 dev->udev,
620 usb_rcvbulkpipe(dev->udev,
621 GSUSB_ENDPOINT_IN),
622 buf,
623 sizeof(struct gs_host_frame),
ae421e33 624 gs_usb_receive_bulk_callback,
d08e973a
MS		 625 parent);
626 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
627
628 usb_anchor_urb(urb, &parent->rx_submitted);
629
630 rc = usb_submit_urb(urb, GFP_KERNEL);
631 if (rc) {
632 if (rc == -ENODEV)
633 netif_device_detach(dev->netdev);
634
635 netdev_err(netdev,
636 "usb_submit failed (err=%d)\n",
637 rc);
638
639 usb_unanchor_urb(urb);
640 break;
641 }
642
643 /* Drop reference,
644 * USB core will take care of freeing it
645 */
646 usb_free_urb(urb);
647 }
648 }
649
650 dm = kmalloc(sizeof(*dm), GFP_KERNEL);
651 if (!dm)
652 return -ENOMEM;
653
654 /* flags */
655 ctrlmode = dev->can.ctrlmode;
656 dm->flags = 0;
657
658 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
659 dm->flags |= GS_CAN_MODE_LOOP_BACK;
660 else if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
661 dm->flags |= GS_CAN_MODE_LISTEN_ONLY;
662
663 /* Controller is not allowed to retry TX
664 * this mode is unavailable on atmels uc3c hardware
665 */
666 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
667 dm->flags |= GS_CAN_MODE_ONE_SHOT;
668
669 if (ctrlmode & CAN_CTRLMODE_3_SAMPLES)
670 dm->flags |= GS_CAN_MODE_TRIPLE_SAMPLE;
671
672 /* finally start device */
673 dm->mode = GS_CAN_MODE_START;
674 rc = usb_control_msg(interface_to_usbdev(dev->iface),
675 usb_sndctrlpipe(interface_to_usbdev(dev->iface), 0),
676 GS_USB_BREQ_MODE,
9be95c91
MS		 677 USB_DIR_OUT | USB_TYPE_VENDOR |
678 USB_RECIP_INTERFACE,
d08e973a
MS		 679 dev->channel,
680 0,
681 dm,
682 sizeof(*dm),
683 1000);
684
685 if (rc < 0) {
686 netdev_err(netdev, "Couldn't start device (err=%d)\n", rc);
687 kfree(dm);
688 return rc;
689 }
690
691 kfree(dm);
692
693 dev->can.state = CAN_STATE_ERROR_ACTIVE;
694
695 if (!(dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY))
696 netif_start_queue(netdev);
697
698 return 0;
699}
700
701static int gs_can_close(struct net_device *netdev)
702{
703 int rc;
704 struct gs_can *dev = netdev_priv(netdev);
705 struct gs_usb *parent = dev->parent;
706
707 netif_stop_queue(netdev);
708
709 /* Stop polling */
710 if (atomic_dec_and_test(&parent->active_channels))
711 usb_kill_anchored_urbs(&parent->rx_submitted);
712
713 /* Stop sending URBs */
714 usb_kill_anchored_urbs(&dev->tx_submitted);
715 atomic_set(&dev->active_tx_urbs, 0);
716
717 /* reset the device */
718 rc = gs_cmd_reset(parent, dev);
719 if (rc < 0)
720 netdev_warn(netdev, "Couldn't shutdown device (err=%d)", rc);
721
722 /* reset tx contexts */
723 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
724 dev->tx_context[rc].dev = dev;
725 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
726 }
727
728 /* close the netdev */
729 close_candev(netdev);
730
731 return 0;
732}
733
734static const struct net_device_ops gs_usb_netdev_ops = {
735 .ndo_open = gs_can_open,
736 .ndo_stop = gs_can_close,
737 .ndo_start_xmit = gs_can_start_xmit,
50212b42 738 .ndo_change_mtu = can_change_mtu,
d08e973a
MS		 739};
740
05ca5270
MS		 741static int gs_usb_set_identify(struct net_device *netdev, bool do_identify)
742{
743 struct gs_can *dev = netdev_priv(netdev);
b05c73bd 744 struct gs_identify_mode *imode;
05ca5270
MS		 745 int rc;
746
b05c73bd
MS		 747 imode = kmalloc(sizeof(*imode), GFP_KERNEL);
748
749 if (!imode)
750 return -ENOMEM;
751
05ca5270 752 if (do_identify)
b05c73bd 753 imode->mode = GS_CAN_IDENTIFY_ON;
05ca5270 754 else
b05c73bd 755 imode->mode = GS_CAN_IDENTIFY_OFF;
05ca5270
MS		 756
757 rc = usb_control_msg(interface_to_usbdev(dev->iface),
758 usb_sndctrlpipe(interface_to_usbdev(dev->iface),
759 0),
760 GS_USB_BREQ_IDENTIFY,
761 USB_DIR_OUT | USB_TYPE_VENDOR |
762 USB_RECIP_INTERFACE,
763 dev->channel,
764 0,
b05c73bd
MS		 765 imode,
766 sizeof(*imode),
05ca5270
MS		 767 100);
768
b05c73bd
MS		 769 kfree(imode);
770
05ca5270
MS		 771 return (rc > 0) ? 0 : rc;
772}
773
774/* blink LED's for finding the this interface */
775static int gs_usb_set_phys_id(struct net_device *dev,
776 enum ethtool_phys_id_state state)
777{
778 int rc = 0;
779
780 switch (state) {
781 case ETHTOOL_ID_ACTIVE:
782 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_ON);
783 break;
784 case ETHTOOL_ID_INACTIVE:
785 rc = gs_usb_set_identify(dev, GS_CAN_IDENTIFY_OFF);
786 break;
787 default:
788 break;
789 }
790
791 return rc;
792}
793
794static const struct ethtool_ops gs_usb_ethtool_ops = {
795 .set_phys_id = gs_usb_set_phys_id,
796};
797
798static struct gs_can *gs_make_candev(unsigned int channel,
799 struct usb_interface *intf,
800 struct gs_device_config *dconf)
d08e973a
MS		 801{
802 struct gs_can *dev;
803 struct net_device *netdev;
804 int rc;
805 struct gs_device_bt_const *bt_const;
806
807 bt_const = kmalloc(sizeof(*bt_const), GFP_KERNEL);
808 if (!bt_const)
809 return ERR_PTR(-ENOMEM);
810
811 /* fetch bit timing constants */
812 rc = usb_control_msg(interface_to_usbdev(intf),
813 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
814 GS_USB_BREQ_BT_CONST,
540a27ae 815 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
d08e973a
MS		 816 channel,
817 0,
818 bt_const,
819 sizeof(*bt_const),
820 1000);
821
822 if (rc < 0) {
823 dev_err(&intf->dev,
824 "Couldn't get bit timing const for channel (err=%d)\n",
825 rc);
826 kfree(bt_const);
827 return ERR_PTR(rc);
828 }
829
830 /* create netdev */
831 netdev = alloc_candev(sizeof(struct gs_can), GS_MAX_TX_URBS);
832 if (!netdev) {
833 dev_err(&intf->dev, "Couldn't allocate candev\n");
834 kfree(bt_const);
835 return ERR_PTR(-ENOMEM);
836 }
837
838 dev = netdev_priv(netdev);
839
840 netdev->netdev_ops = &gs_usb_netdev_ops;
841
842 netdev->flags |= IFF_ECHO; /* we support full roundtrip echo */
843
844 /* dev settup */
845 strcpy(dev->bt_const.name, "gs_usb");
846 dev->bt_const.tseg1_min = bt_const->tseg1_min;
847 dev->bt_const.tseg1_max = bt_const->tseg1_max;
848 dev->bt_const.tseg2_min = bt_const->tseg2_min;
849 dev->bt_const.tseg2_max = bt_const->tseg2_max;
850 dev->bt_const.sjw_max = bt_const->sjw_max;
851 dev->bt_const.brp_min = bt_const->brp_min;
852 dev->bt_const.brp_max = bt_const->brp_max;
853 dev->bt_const.brp_inc = bt_const->brp_inc;
854
855 dev->udev = interface_to_usbdev(intf);
856 dev->iface = intf;
857 dev->netdev = netdev;
858 dev->channel = channel;
859
860 init_usb_anchor(&dev->tx_submitted);
861 atomic_set(&dev->active_tx_urbs, 0);
862 spin_lock_init(&dev->tx_ctx_lock);
863 for (rc = 0; rc < GS_MAX_TX_URBS; rc++) {
864 dev->tx_context[rc].dev = dev;
865 dev->tx_context[rc].echo_id = GS_MAX_TX_URBS;
866 }
867
868 /* can settup */
869 dev->can.state = CAN_STATE_STOPPED;
870 dev->can.clock.freq = bt_const->fclk_can;
871 dev->can.bittiming_const = &dev->bt_const;
872 dev->can.do_set_bittiming = gs_usb_set_bittiming;
873
874 dev->can.ctrlmode_supported = 0;
875
876 if (bt_const->feature & GS_CAN_FEATURE_LISTEN_ONLY)
877 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
878
879 if (bt_const->feature & GS_CAN_FEATURE_LOOP_BACK)
880 dev->can.ctrlmode_supported |= CAN_CTRLMODE_LOOPBACK;
881
882 if (bt_const->feature & GS_CAN_FEATURE_TRIPLE_SAMPLE)
883 dev->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
884
885 if (bt_const->feature & GS_CAN_FEATURE_ONE_SHOT)
886 dev->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
887
d08e973a
MS		 888 SET_NETDEV_DEV(netdev, &intf->dev);
889
05ca5270
MS		 890 if (dconf->sw_version > 1)
891 if (bt_const->feature & GS_CAN_FEATURE_IDENTIFY)
892 netdev->ethtool_ops = &gs_usb_ethtool_ops;
893
894 kfree(bt_const);
895
d08e973a
MS		 896 rc = register_candev(dev->netdev);
897 if (rc) {
898 free_candev(dev->netdev);
899 dev_err(&intf->dev, "Couldn't register candev (err=%d)\n", rc);
900 return ERR_PTR(rc);
901 }
902
903 return dev;
904}
905
906static void gs_destroy_candev(struct gs_can *dev)
907{
908 unregister_candev(dev->netdev);
d08e973a 909 usb_kill_anchored_urbs(&dev->tx_submitted);
e9a2d81b 910 free_candev(dev->netdev);
d08e973a
MS		 911}
912
05ca5270
MS		 913static int gs_usb_probe(struct usb_interface *intf,
914 const struct usb_device_id *id)
d08e973a
MS		 915{
916 struct gs_usb *dev;
917 int rc = -ENOMEM;
918 unsigned int icount, i;
c919a306
EZ		 919 struct gs_host_config *hconf;
920 struct gs_device_config *dconf;
921
922 hconf = kmalloc(sizeof(*hconf), GFP_KERNEL);
923 if (!hconf)
924 return -ENOMEM;
925
926 hconf->byte_order = 0x0000beef;
d08e973a
MS		 927
928 /* send host config */
929 rc = usb_control_msg(interface_to_usbdev(intf),
930 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
931 GS_USB_BREQ_HOST_FORMAT,
540a27ae 932 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
d08e973a
MS		 933 1,
934 intf->altsetting[0].desc.bInterfaceNumber,
c919a306
EZ		 935 hconf,
936 sizeof(*hconf),
d08e973a
MS		 937 1000);
938
c919a306
EZ		 939 kfree(hconf);
940
d08e973a
MS		 941 if (rc < 0) {
942 dev_err(&intf->dev, "Couldn't send data format (err=%d)\n",
943 rc);
944 return rc;
945 }
946
c919a306
EZ		 947 dconf = kmalloc(sizeof(*dconf), GFP_KERNEL);
948 if (!dconf)
949 return -ENOMEM;
950
d08e973a
MS		 951 /* read device config */
952 rc = usb_control_msg(interface_to_usbdev(intf),
953 usb_rcvctrlpipe(interface_to_usbdev(intf), 0),
954 GS_USB_BREQ_DEVICE_CONFIG,
540a27ae 955 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
d08e973a
MS		 956 1,
957 intf->altsetting[0].desc.bInterfaceNumber,
c919a306
EZ		 958 dconf,
959 sizeof(*dconf),
d08e973a
MS		 960 1000);
961 if (rc < 0) {
962 dev_err(&intf->dev, "Couldn't get device config: (err=%d)\n",
963 rc);
c919a306 964 kfree(dconf);
d08e973a
MS		 965 return rc;
966 }
967
c919a306 968 icount = dconf->icount + 1;
d08e973a
MS		 969 dev_info(&intf->dev, "Configuring for %d interfaces\n", icount);
970
971 if (icount > GS_MAX_INTF) {
972 dev_err(&intf->dev,
973 "Driver cannot handle more that %d CAN interfaces\n",
974 GS_MAX_INTF);
c919a306 975 kfree(dconf);
d08e973a
MS		 976 return -EINVAL;
977 }
978
979 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
c919a306
EZ		 980 if (!dev) {
981 kfree(dconf);
37920a74 982 return -ENOMEM;
c919a306
EZ		 983 }
984
d08e973a
MS		 985 init_usb_anchor(&dev->rx_submitted);
986
987 atomic_set(&dev->active_channels, 0);
988
989 usb_set_intfdata(intf, dev);
990 dev->udev = interface_to_usbdev(intf);
991
992 for (i = 0; i < icount; i++) {
c919a306 993 dev->canch[i] = gs_make_candev(i, intf, dconf);
d08e973a 994 if (IS_ERR_OR_NULL(dev->canch[i])) {
e9a2d81b
MS		 995 /* save error code to return later */
996 rc = PTR_ERR(dev->canch[i]);
997
d08e973a
MS		 998 /* on failure destroy previously created candevs */
999 icount = i;
e9a2d81b 1000 for (i = 0; i < icount; i++)
d08e973a 1001 gs_destroy_candev(dev->canch[i]);
e9a2d81b
MS		 1002
1003 usb_kill_anchored_urbs(&dev->rx_submitted);
c919a306 1004 kfree(dconf);
d08e973a
MS		 1005 kfree(dev);
1006 return rc;
1007 }
1008 dev->canch[i]->parent = dev;
1009 }
1010
c919a306
EZ		 1011 kfree(dconf);
1012
d08e973a
MS		 1013 return 0;
1014}
1015
1016static void gs_usb_disconnect(struct usb_interface *intf)
1017{
1018 unsigned i;
1019 struct gs_usb *dev = usb_get_intfdata(intf);
1020 usb_set_intfdata(intf, NULL);
1021
1022 if (!dev) {
1023 dev_err(&intf->dev, "Disconnect (nodata)\n");
1024 return;
1025 }
1026
e9a2d81b
MS		 1027 for (i = 0; i < GS_MAX_INTF; i++)
1028 if (dev->canch[i])
1029 gs_destroy_candev(dev->canch[i]);
d08e973a
MS		 1030
1031 usb_kill_anchored_urbs(&dev->rx_submitted);
e9a2d81b 1032 kfree(dev);
d08e973a
MS		 1033}
1034
1035static const struct usb_device_id gs_usb_table[] = {
2fe6c943
MS		 1036 { USB_DEVICE_INTERFACE_NUMBER(USB_GSUSB_1_VENDOR_ID,
1037 USB_GSUSB_1_PRODUCT_ID, 0) },
f155d9c0
MS		 1038 { USB_DEVICE_INTERFACE_NUMBER(USB_CANDLELIGHT_VENDOR_ID,
1039 USB_CANDLELIGHT_PRODUCT_ID, 0) },
d08e973a
MS		 1040 {} /* Terminating entry */
1041};
1042
1043MODULE_DEVICE_TABLE(usb, gs_usb_table);
1044
1045static struct usb_driver gs_usb_driver = {
1046 .name = "gs_usb",
1047 .probe = gs_usb_probe,
1048 .disconnect = gs_usb_disconnect,
1049 .id_table = gs_usb_table,
1050};
1051
1052module_usb_driver(gs_usb_driver);
1053
1054MODULE_AUTHOR("Maximilian Schneider <mws@schneidersoft.net>");
1055MODULE_DESCRIPTION(
1056"Socket CAN device driver for Geschwister Schneider Technologie-, "
f155d9c0
MS		 1057"Entwicklungs- und Vertriebs UG. USB2.0 to CAN interfaces\n"
1058"and bytewerk.org candleLight USB CAN interfaces.");
d08e973a 1059MODULE_LICENSE("GPL v2");