2 * CAN driver for PEAK System USB adapters
3 * Derived from the PCAN project file driver/src/pcan_usb_core.c
5 * Copyright (C) 2003-2010 PEAK System-Technik GmbH
6 * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
8 * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
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.
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.
19 #include <linux/init.h>
20 #include <linux/signal.h>
21 #include <linux/slab.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/usb.h>
26 #include <linux/can.h>
27 #include <linux/can/dev.h>
28 #include <linux/can/error.h>
30 #include "pcan_usb_core.h"
32 MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
33 MODULE_DESCRIPTION("CAN driver for PEAK-System USB adapters");
34 MODULE_LICENSE("GPL v2");
36 /* Table of devices that work with this driver */
37 static struct usb_device_id peak_usb_table[] = {
38 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USB_PRODUCT_ID)},
39 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPRO_PRODUCT_ID)},
40 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBFD_PRODUCT_ID)},
41 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPROFD_PRODUCT_ID)},
42 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBCHIP_PRODUCT_ID)},
43 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBX6_PRODUCT_ID)},
44 {} /* Terminating entry */
47 MODULE_DEVICE_TABLE(usb, peak_usb_table);
49 /* List of supported PCAN-USB adapters (NULL terminated list) */
50 static const struct peak_usb_adapter *const peak_usb_adapters_list[] = {
63 void pcan_dump_mem(char *prompt, void *p, int l)
65 pr_info("%s dumping %s (%d bytes):\n",
66 PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l);
67 print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE,
68 DUMP_WIDTH, 1, p, l, false);
72 * initialize a time_ref object with usb adapter own settings
74 void peak_usb_init_time_ref(struct peak_time_ref *time_ref,
75 const struct peak_usb_adapter *adapter)
78 memset(time_ref, 0, sizeof(struct peak_time_ref));
79 time_ref->adapter = adapter;
83 static void peak_usb_add_us(struct timeval *tv, u32 delta_us)
85 /* number of s. to add to final time */
86 u32 delta_s = delta_us / 1000000;
88 delta_us -= delta_s * 1000000;
90 tv->tv_usec += delta_us;
91 if (tv->tv_usec >= 1000000) {
92 tv->tv_usec -= 1000000;
95 tv->tv_sec += delta_s;
99 * sometimes, another now may be more recent than current one...
101 void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
103 time_ref->ts_dev_2 = ts_now;
105 /* should wait at least two passes before computing */
106 if (time_ref->tv_host.tv_sec > 0) {
107 u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1;
109 if (time_ref->ts_dev_2 < time_ref->ts_dev_1)
110 delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1;
112 time_ref->ts_total += delta_ts;
117 * register device timestamp as now
119 void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
121 if (time_ref->tv_host_0.tv_sec == 0) {
122 /* use monotonic clock to correctly compute further deltas */
123 time_ref->tv_host_0 = ktime_to_timeval(ktime_get());
124 time_ref->tv_host.tv_sec = 0;
127 * delta_us should not be >= 2^32 => delta_s should be < 4294
128 * handle 32-bits wrapping here: if count of s. reaches 4200,
129 * reset counters and change time base
131 if (time_ref->tv_host.tv_sec != 0) {
132 u32 delta_s = time_ref->tv_host.tv_sec
133 - time_ref->tv_host_0.tv_sec;
134 if (delta_s > 4200) {
135 time_ref->tv_host_0 = time_ref->tv_host;
136 time_ref->ts_total = 0;
140 time_ref->tv_host = ktime_to_timeval(ktime_get());
141 time_ref->tick_count++;
144 time_ref->ts_dev_1 = time_ref->ts_dev_2;
145 peak_usb_update_ts_now(time_ref, ts_now);
149 * compute timeval according to current ts and time_ref data
151 void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts,
154 /* protect from getting timeval before setting now */
155 if (time_ref->tv_host.tv_sec > 0) {
158 delta_us = ts - time_ref->ts_dev_2;
159 if (ts < time_ref->ts_dev_2)
160 delta_us &= (1 << time_ref->adapter->ts_used_bits) - 1;
162 delta_us += time_ref->ts_total;
164 delta_us *= time_ref->adapter->us_per_ts_scale;
165 delta_us >>= time_ref->adapter->us_per_ts_shift;
167 *tv = time_ref->tv_host_0;
168 peak_usb_add_us(tv, (u32)delta_us);
170 *tv = ktime_to_timeval(ktime_get());
175 * post received skb after having set any hw timestamp
177 int peak_usb_netif_rx(struct sk_buff *skb,
178 struct peak_time_ref *time_ref, u32 ts_low, u32 ts_high)
180 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
183 peak_usb_get_ts_tv(time_ref, ts_low, &tv);
184 hwts->hwtstamp = timeval_to_ktime(tv);
186 return netif_rx(skb);
190 * callback for bulk Rx urb
192 static void peak_usb_read_bulk_callback(struct urb *urb)
194 struct peak_usb_device *dev = urb->context;
195 struct net_device *netdev;
198 netdev = dev->netdev;
200 if (!netif_device_present(netdev))
203 /* check reception status */
204 switch (urb->status) {
218 "Rx urb aborted (%d)\n", urb->status);
222 /* protect from any incoming empty msgs */
223 if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) {
224 /* handle these kinds of msgs only if _start callback called */
225 if (dev->state & PCAN_USB_STATE_STARTED) {
226 err = dev->adapter->dev_decode_buf(dev, urb);
228 pcan_dump_mem("received usb message",
229 urb->transfer_buffer,
230 urb->transfer_buffer_length);
235 usb_fill_bulk_urb(urb, dev->udev,
236 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
237 urb->transfer_buffer, dev->adapter->rx_buffer_size,
238 peak_usb_read_bulk_callback, dev);
240 usb_anchor_urb(urb, &dev->rx_submitted);
241 err = usb_submit_urb(urb, GFP_ATOMIC);
245 usb_unanchor_urb(urb);
248 netif_device_detach(netdev);
250 netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
255 * callback for bulk Tx urb
257 static void peak_usb_write_bulk_callback(struct urb *urb)
259 struct peak_tx_urb_context *context = urb->context;
260 struct peak_usb_device *dev;
261 struct net_device *netdev;
266 netdev = dev->netdev;
268 atomic_dec(&dev->active_tx_urbs);
270 if (!netif_device_present(netdev))
273 /* check tx status */
274 switch (urb->status) {
276 /* transmission complete */
277 netdev->stats.tx_packets++;
278 netdev->stats.tx_bytes += context->data_len;
280 /* prevent tx timeout */
281 netif_trans_update(netdev);
286 netdev_err(netdev, "Tx urb aborted (%d)\n",
296 /* should always release echo skb and corresponding context */
297 can_get_echo_skb(netdev, context->echo_index);
298 context->echo_index = PCAN_USB_MAX_TX_URBS;
300 /* do wakeup tx queue in case of success only */
302 netif_wake_queue(netdev);
306 * called by netdev to send one skb on the CAN interface.
308 static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb,
309 struct net_device *netdev)
311 struct peak_usb_device *dev = netdev_priv(netdev);
312 struct peak_tx_urb_context *context = NULL;
313 struct net_device_stats *stats = &netdev->stats;
314 struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
318 size_t size = dev->adapter->tx_buffer_size;
320 if (can_dropped_invalid_skb(netdev, skb))
323 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
324 if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) {
325 context = dev->tx_contexts + i;
330 /* should not occur except during restart */
331 return NETDEV_TX_BUSY;
335 obuf = urb->transfer_buffer;
337 err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size);
340 netdev_err(netdev, "packet dropped\n");
346 context->echo_index = i;
348 /* Note: this works with CANFD frames too */
349 context->data_len = cfd->len;
351 usb_anchor_urb(urb, &dev->tx_submitted);
353 can_put_echo_skb(skb, netdev, context->echo_index);
355 atomic_inc(&dev->active_tx_urbs);
357 err = usb_submit_urb(urb, GFP_ATOMIC);
359 can_free_echo_skb(netdev, context->echo_index);
361 usb_unanchor_urb(urb);
363 /* this context is not used in fact */
364 context->echo_index = PCAN_USB_MAX_TX_URBS;
366 atomic_dec(&dev->active_tx_urbs);
370 netif_device_detach(netdev);
373 netdev_warn(netdev, "tx urb submitting failed err=%d\n",
376 /* cable unplugged */
380 netif_trans_update(netdev);
382 /* slow down tx path */
383 if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS)
384 netif_stop_queue(netdev);
391 * start the CAN interface.
392 * Rx and Tx urbs are allocated here. Rx urbs are submitted here.
394 static int peak_usb_start(struct peak_usb_device *dev)
396 struct net_device *netdev = dev->netdev;
399 for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) {
403 /* create a URB, and a buffer for it, to receive usb messages */
404 urb = usb_alloc_urb(0, GFP_KERNEL);
410 buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL);
417 usb_fill_bulk_urb(urb, dev->udev,
418 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
419 buf, dev->adapter->rx_buffer_size,
420 peak_usb_read_bulk_callback, dev);
422 /* ask last usb_free_urb() to also kfree() transfer_buffer */
423 urb->transfer_flags |= URB_FREE_BUFFER;
424 usb_anchor_urb(urb, &dev->rx_submitted);
426 err = usb_submit_urb(urb, GFP_KERNEL);
429 netif_device_detach(dev->netdev);
431 usb_unanchor_urb(urb);
437 /* drop reference, USB core will take care of freeing it */
441 /* did we submit any URBs? Warn if we was not able to submit all urbs */
442 if (i < PCAN_USB_MAX_RX_URBS) {
444 netdev_err(netdev, "couldn't setup any rx URB\n");
448 netdev_warn(netdev, "rx performance may be slow\n");
451 /* pre-alloc tx buffers and corresponding urbs */
452 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
453 struct peak_tx_urb_context *context;
457 /* create a URB and a buffer for it, to transmit usb messages */
458 urb = usb_alloc_urb(0, GFP_KERNEL);
464 buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL);
471 context = dev->tx_contexts + i;
475 usb_fill_bulk_urb(urb, dev->udev,
476 usb_sndbulkpipe(dev->udev, dev->ep_msg_out),
477 buf, dev->adapter->tx_buffer_size,
478 peak_usb_write_bulk_callback, context);
480 /* ask last usb_free_urb() to also kfree() transfer_buffer */
481 urb->transfer_flags |= URB_FREE_BUFFER;
484 /* warn if we were not able to allocate enough tx contexts */
485 if (i < PCAN_USB_MAX_TX_URBS) {
487 netdev_err(netdev, "couldn't setup any tx URB\n");
491 netdev_warn(netdev, "tx performance may be slow\n");
494 if (dev->adapter->dev_start) {
495 err = dev->adapter->dev_start(dev);
500 dev->state |= PCAN_USB_STATE_STARTED;
502 /* can set bus on now */
503 if (dev->adapter->dev_set_bus) {
504 err = dev->adapter->dev_set_bus(dev, 1);
509 dev->can.state = CAN_STATE_ERROR_ACTIVE;
515 netif_device_detach(dev->netdev);
517 netdev_warn(netdev, "couldn't submit control: %d\n", err);
519 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
520 usb_free_urb(dev->tx_contexts[i].urb);
521 dev->tx_contexts[i].urb = NULL;
524 usb_kill_anchored_urbs(&dev->rx_submitted);
530 * called by netdev to open the corresponding CAN interface.
532 static int peak_usb_ndo_open(struct net_device *netdev)
534 struct peak_usb_device *dev = netdev_priv(netdev);
538 err = open_candev(netdev);
542 /* finally start device */
543 err = peak_usb_start(dev);
545 netdev_err(netdev, "couldn't start device: %d\n", err);
546 close_candev(netdev);
550 netif_start_queue(netdev);
556 * unlink in-flight Rx and Tx urbs and free their memory.
558 static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev)
562 /* free all Rx (submitted) urbs */
563 usb_kill_anchored_urbs(&dev->rx_submitted);
565 /* free unsubmitted Tx urbs first */
566 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
567 struct urb *urb = dev->tx_contexts[i].urb;
570 dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) {
572 * this urb is already released or always submitted,
573 * let usb core free by itself
579 dev->tx_contexts[i].urb = NULL;
582 /* then free all submitted Tx urbs */
583 usb_kill_anchored_urbs(&dev->tx_submitted);
584 atomic_set(&dev->active_tx_urbs, 0);
588 * called by netdev to close the corresponding CAN interface.
590 static int peak_usb_ndo_stop(struct net_device *netdev)
592 struct peak_usb_device *dev = netdev_priv(netdev);
594 dev->state &= ~PCAN_USB_STATE_STARTED;
595 netif_stop_queue(netdev);
597 /* unlink all pending urbs and free used memory */
598 peak_usb_unlink_all_urbs(dev);
600 if (dev->adapter->dev_stop)
601 dev->adapter->dev_stop(dev);
603 close_candev(netdev);
605 dev->can.state = CAN_STATE_STOPPED;
607 /* can set bus off now */
608 if (dev->adapter->dev_set_bus) {
609 int err = dev->adapter->dev_set_bus(dev, 0);
618 * handle end of waiting for the device to reset
620 void peak_usb_restart_complete(struct peak_usb_device *dev)
622 /* finally MUST update can state */
623 dev->can.state = CAN_STATE_ERROR_ACTIVE;
625 /* netdev queue can be awaken now */
626 netif_wake_queue(dev->netdev);
629 void peak_usb_async_complete(struct urb *urb)
631 kfree(urb->transfer_buffer);
636 * device (auto-)restart mechanism runs in a timer context =>
637 * MUST handle restart with asynchronous usb transfers
639 static int peak_usb_restart(struct peak_usb_device *dev)
646 * if device doesn't define any asynchronous restart handler, simply
647 * wake the netdev queue up
649 if (!dev->adapter->dev_restart_async) {
650 peak_usb_restart_complete(dev);
654 /* first allocate a urb to handle the asynchronous steps */
655 urb = usb_alloc_urb(0, GFP_ATOMIC);
659 /* also allocate enough space for the commands to send */
660 buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC);
666 /* call the device specific handler for the restart */
667 err = dev->adapter->dev_restart_async(dev, urb, buf);
678 * candev callback used to change CAN mode.
679 * Warning: this is called from a timer context!
681 static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode)
683 struct peak_usb_device *dev = netdev_priv(netdev);
688 err = peak_usb_restart(dev);
690 netdev_err(netdev, "couldn't start device (err %d)\n",
702 * candev callback used to set device nominal/arbitration bitrate.
704 static int peak_usb_set_bittiming(struct net_device *netdev)
706 struct peak_usb_device *dev = netdev_priv(netdev);
707 const struct peak_usb_adapter *pa = dev->adapter;
709 if (pa->dev_set_bittiming) {
710 struct can_bittiming *bt = &dev->can.bittiming;
711 int err = pa->dev_set_bittiming(dev, bt);
714 netdev_info(netdev, "couldn't set bitrate (err %d)\n",
723 * candev callback used to set device data bitrate.
725 static int peak_usb_set_data_bittiming(struct net_device *netdev)
727 struct peak_usb_device *dev = netdev_priv(netdev);
728 const struct peak_usb_adapter *pa = dev->adapter;
730 if (pa->dev_set_data_bittiming) {
731 struct can_bittiming *bt = &dev->can.data_bittiming;
732 int err = pa->dev_set_data_bittiming(dev, bt);
736 "couldn't set data bitrate (err %d)\n",
745 static const struct net_device_ops peak_usb_netdev_ops = {
746 .ndo_open = peak_usb_ndo_open,
747 .ndo_stop = peak_usb_ndo_stop,
748 .ndo_start_xmit = peak_usb_ndo_start_xmit,
749 .ndo_change_mtu = can_change_mtu,
753 * create one device which is attached to CAN controller #ctrl_idx of the
756 static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
757 struct usb_interface *intf, int ctrl_idx)
759 struct usb_device *usb_dev = interface_to_usbdev(intf);
760 int sizeof_candev = peak_usb_adapter->sizeof_dev_private;
761 struct peak_usb_device *dev;
762 struct net_device *netdev;
766 if (sizeof_candev < sizeof(struct peak_usb_device))
767 sizeof_candev = sizeof(struct peak_usb_device);
769 netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS);
771 dev_err(&intf->dev, "%s: couldn't alloc candev\n",
772 PCAN_USB_DRIVER_NAME);
776 dev = netdev_priv(netdev);
778 /* allocate a buffer large enough to send commands */
779 dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
782 goto lbl_free_candev;
786 dev->netdev = netdev;
787 dev->adapter = peak_usb_adapter;
788 dev->ctrl_idx = ctrl_idx;
789 dev->state = PCAN_USB_STATE_CONNECTED;
791 dev->ep_msg_in = peak_usb_adapter->ep_msg_in;
792 dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
794 dev->can.clock = peak_usb_adapter->clock;
795 dev->can.bittiming_const = peak_usb_adapter->bittiming_const;
796 dev->can.do_set_bittiming = peak_usb_set_bittiming;
797 dev->can.data_bittiming_const = peak_usb_adapter->data_bittiming_const;
798 dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
799 dev->can.do_set_mode = peak_usb_set_mode;
800 dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
801 dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
803 netdev->netdev_ops = &peak_usb_netdev_ops;
805 netdev->flags |= IFF_ECHO; /* we support local echo */
807 init_usb_anchor(&dev->rx_submitted);
809 init_usb_anchor(&dev->tx_submitted);
810 atomic_set(&dev->active_tx_urbs, 0);
812 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
813 dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS;
815 dev->prev_siblings = usb_get_intfdata(intf);
816 usb_set_intfdata(intf, dev);
818 SET_NETDEV_DEV(netdev, &intf->dev);
819 netdev->dev_id = ctrl_idx;
821 err = register_candev(netdev);
823 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
824 goto lbl_restore_intf_data;
827 if (dev->prev_siblings)
828 (dev->prev_siblings)->next_siblings = dev;
830 /* keep hw revision into the netdevice */
831 tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice);
832 dev->device_rev = tmp16 >> 8;
834 if (dev->adapter->dev_init) {
835 err = dev->adapter->dev_init(dev);
837 goto lbl_unregister_candev;
841 if (dev->adapter->dev_set_bus) {
842 err = dev->adapter->dev_set_bus(dev, 0);
844 goto lbl_unregister_candev;
847 /* get device number early */
848 if (dev->adapter->dev_get_device_id)
849 dev->adapter->dev_get_device_id(dev, &dev->device_number);
851 netdev_info(netdev, "attached to %s channel %u (device %u)\n",
852 peak_usb_adapter->name, ctrl_idx, dev->device_number);
856 lbl_unregister_candev:
857 unregister_candev(netdev);
859 lbl_restore_intf_data:
860 usb_set_intfdata(intf, dev->prev_siblings);
870 * called by the usb core when the device is unplugged from the system
872 static void peak_usb_disconnect(struct usb_interface *intf)
874 struct peak_usb_device *dev;
875 struct peak_usb_device *dev_prev_siblings;
877 /* unregister as many netdev devices as siblings */
878 for (dev = usb_get_intfdata(intf); dev; dev = dev_prev_siblings) {
879 struct net_device *netdev = dev->netdev;
882 dev_prev_siblings = dev->prev_siblings;
883 dev->state &= ~PCAN_USB_STATE_CONNECTED;
884 strncpy(name, netdev->name, IFNAMSIZ);
886 unregister_netdev(netdev);
889 dev->next_siblings = NULL;
890 if (dev->adapter->dev_free)
891 dev->adapter->dev_free(dev);
894 dev_info(&intf->dev, "%s removed\n", name);
897 usb_set_intfdata(intf, NULL);
901 * probe function for new PEAK-System devices
903 static int peak_usb_probe(struct usb_interface *intf,
904 const struct usb_device_id *id)
906 struct usb_device *usb_dev = interface_to_usbdev(intf);
907 const u16 usb_id_product = le16_to_cpu(usb_dev->descriptor.idProduct);
908 const struct peak_usb_adapter *peak_usb_adapter = NULL;
909 int i, err = -ENOMEM;
911 usb_dev = interface_to_usbdev(intf);
913 /* get corresponding PCAN-USB adapter */
914 for (i = 0; i < ARRAY_SIZE(peak_usb_adapters_list); i++)
915 if (peak_usb_adapters_list[i]->device_id == usb_id_product) {
916 peak_usb_adapter = peak_usb_adapters_list[i];
920 if (!peak_usb_adapter) {
921 /* should never come except device_id bad usage in this file */
922 pr_err("%s: didn't find device id. 0x%x in devices list\n",
923 PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct);
927 /* got corresponding adapter: check if it handles current interface */
928 if (peak_usb_adapter->intf_probe) {
929 err = peak_usb_adapter->intf_probe(intf);
934 for (i = 0; i < peak_usb_adapter->ctrl_count; i++) {
935 err = peak_usb_create_dev(peak_usb_adapter, intf, i);
937 /* deregister already created devices */
938 peak_usb_disconnect(intf);
946 /* usb specific object needed to register this driver with the usb subsystem */
947 static struct usb_driver peak_usb_driver = {
948 .name = PCAN_USB_DRIVER_NAME,
949 .disconnect = peak_usb_disconnect,
950 .probe = peak_usb_probe,
951 .id_table = peak_usb_table,
954 static int __init peak_usb_init(void)
958 /* register this driver with the USB subsystem */
959 err = usb_register(&peak_usb_driver);
961 pr_err("%s: usb_register failed (err %d)\n",
962 PCAN_USB_DRIVER_NAME, err);
967 static int peak_usb_do_device_exit(struct device *d, void *arg)
969 struct usb_interface *intf = to_usb_interface(d);
970 struct peak_usb_device *dev;
972 /* stop as many netdev devices as siblings */
973 for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
974 struct net_device *netdev = dev->netdev;
976 if (netif_device_present(netdev))
977 if (dev->adapter->dev_exit)
978 dev->adapter->dev_exit(dev);
984 static void __exit peak_usb_exit(void)
988 /* last chance do send any synchronous commands here */
989 err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL,
990 NULL, peak_usb_do_device_exit);
992 pr_err("%s: failed to stop all can devices (err %d)\n",
993 PCAN_USB_DRIVER_NAME, err);
995 /* deregister this driver with the USB subsystem */
996 usb_deregister(&peak_usb_driver);
998 pr_info("%s: PCAN-USB interfaces driver unloaded\n",
999 PCAN_USB_DRIVER_NAME);
1002 module_init(peak_usb_init);
1003 module_exit(peak_usb_exit);