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_USBX6_PRODUCT_ID)},
43 {} /* Terminating entry */
46 MODULE_DEVICE_TABLE(usb, peak_usb_table);
48 /* List of supported PCAN-USB adapters (NULL terminated list) */
49 static const struct peak_usb_adapter *const peak_usb_adapters_list[] = {
61 void pcan_dump_mem(char *prompt, void *p, int l)
63 pr_info("%s dumping %s (%d bytes):\n",
64 PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l);
65 print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE,
66 DUMP_WIDTH, 1, p, l, false);
70 * initialize a time_ref object with usb adapter own settings
72 void peak_usb_init_time_ref(struct peak_time_ref *time_ref,
73 const struct peak_usb_adapter *adapter)
76 memset(time_ref, 0, sizeof(struct peak_time_ref));
77 time_ref->adapter = adapter;
81 static void peak_usb_add_us(struct timeval *tv, u32 delta_us)
83 /* number of s. to add to final time */
84 u32 delta_s = delta_us / 1000000;
86 delta_us -= delta_s * 1000000;
88 tv->tv_usec += delta_us;
89 if (tv->tv_usec >= 1000000) {
90 tv->tv_usec -= 1000000;
93 tv->tv_sec += delta_s;
97 * sometimes, another now may be more recent than current one...
99 void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
101 time_ref->ts_dev_2 = ts_now;
103 /* should wait at least two passes before computing */
104 if (time_ref->tv_host.tv_sec > 0) {
105 u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1;
107 if (time_ref->ts_dev_2 < time_ref->ts_dev_1)
108 delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1;
110 time_ref->ts_total += delta_ts;
115 * register device timestamp as now
117 void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
119 if (time_ref->tv_host_0.tv_sec == 0) {
120 /* use monotonic clock to correctly compute further deltas */
121 time_ref->tv_host_0 = ktime_to_timeval(ktime_get());
122 time_ref->tv_host.tv_sec = 0;
125 * delta_us should not be >= 2^32 => delta_s should be < 4294
126 * handle 32-bits wrapping here: if count of s. reaches 4200,
127 * reset counters and change time base
129 if (time_ref->tv_host.tv_sec != 0) {
130 u32 delta_s = time_ref->tv_host.tv_sec
131 - time_ref->tv_host_0.tv_sec;
132 if (delta_s > 4200) {
133 time_ref->tv_host_0 = time_ref->tv_host;
134 time_ref->ts_total = 0;
138 time_ref->tv_host = ktime_to_timeval(ktime_get());
139 time_ref->tick_count++;
142 time_ref->ts_dev_1 = time_ref->ts_dev_2;
143 peak_usb_update_ts_now(time_ref, ts_now);
147 * compute timeval according to current ts and time_ref data
149 void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts,
152 /* protect from getting timeval before setting now */
153 if (time_ref->tv_host.tv_sec > 0) {
157 /* General case: dev_ts_1 < dev_ts_2 < ts, with:
159 * - dev_ts_1 = previous sync timestamp
160 * - dev_ts_2 = last sync timestamp
161 * - ts = event timestamp
162 * - ts_period = known sync period (theoretical)
163 * ~ dev_ts2 - dev_ts1
166 * - time counters wrap (see adapter->ts_used_bits)
167 * - sometimes, dev_ts_1 < ts < dev_ts2
169 * "normal" case (sync time counters increase):
170 * must take into account case when ts wraps (tsw)
174 * ---+--------+----+-------0-+--+-->
175 * ts_dev_1 | ts_dev_2 |
178 if (time_ref->ts_dev_1 < time_ref->ts_dev_2) {
179 /* case when event time (tsw) wraps */
180 if (ts < time_ref->ts_dev_1)
181 delta_ts = BIT_ULL(time_ref->adapter->ts_used_bits);
183 /* Otherwise, sync time counter (ts_dev_2) has wrapped:
184 * handle case when event time (tsn) hasn't.
188 * ---+--------+--0-+---------+--+-->
189 * ts_dev_1 | ts_dev_2 |
192 } else if (time_ref->ts_dev_1 < ts) {
193 delta_ts = -BIT_ULL(time_ref->adapter->ts_used_bits);
196 /* add delay between last sync and event timestamps */
197 delta_ts += (signed int)(ts - time_ref->ts_dev_2);
199 /* add time from beginning to last sync */
200 delta_ts += time_ref->ts_total;
202 /* convert ticks number into microseconds */
203 delta_us = delta_ts * time_ref->adapter->us_per_ts_scale;
204 delta_us >>= time_ref->adapter->us_per_ts_shift;
206 *tv = time_ref->tv_host_0;
207 peak_usb_add_us(tv, (u32)delta_us);
209 *tv = ktime_to_timeval(ktime_get());
214 * post received skb after having set any hw timestamp
216 int peak_usb_netif_rx(struct sk_buff *skb,
217 struct peak_time_ref *time_ref, u32 ts_low, u32 ts_high)
219 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
222 peak_usb_get_ts_tv(time_ref, ts_low, &tv);
223 hwts->hwtstamp = timeval_to_ktime(tv);
225 return netif_rx(skb);
229 * callback for bulk Rx urb
231 static void peak_usb_read_bulk_callback(struct urb *urb)
233 struct peak_usb_device *dev = urb->context;
234 struct net_device *netdev;
237 netdev = dev->netdev;
239 if (!netif_device_present(netdev))
242 /* check reception status */
243 switch (urb->status) {
257 "Rx urb aborted (%d)\n", urb->status);
261 /* protect from any incoming empty msgs */
262 if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) {
263 /* handle these kinds of msgs only if _start callback called */
264 if (dev->state & PCAN_USB_STATE_STARTED) {
265 err = dev->adapter->dev_decode_buf(dev, urb);
267 pcan_dump_mem("received usb message",
268 urb->transfer_buffer,
269 urb->transfer_buffer_length);
274 usb_fill_bulk_urb(urb, dev->udev,
275 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
276 urb->transfer_buffer, dev->adapter->rx_buffer_size,
277 peak_usb_read_bulk_callback, dev);
279 usb_anchor_urb(urb, &dev->rx_submitted);
280 err = usb_submit_urb(urb, GFP_ATOMIC);
284 usb_unanchor_urb(urb);
287 netif_device_detach(netdev);
289 netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
294 * callback for bulk Tx urb
296 static void peak_usb_write_bulk_callback(struct urb *urb)
298 struct peak_tx_urb_context *context = urb->context;
299 struct peak_usb_device *dev;
300 struct net_device *netdev;
305 netdev = dev->netdev;
307 atomic_dec(&dev->active_tx_urbs);
309 if (!netif_device_present(netdev))
312 /* check tx status */
313 switch (urb->status) {
315 /* transmission complete */
316 netdev->stats.tx_packets++;
317 netdev->stats.tx_bytes += context->data_len;
319 /* prevent tx timeout */
320 netif_trans_update(netdev);
325 netdev_err(netdev, "Tx urb aborted (%d)\n",
335 /* should always release echo skb and corresponding context */
336 can_get_echo_skb(netdev, context->echo_index);
337 context->echo_index = PCAN_USB_MAX_TX_URBS;
339 /* do wakeup tx queue in case of success only */
341 netif_wake_queue(netdev);
345 * called by netdev to send one skb on the CAN interface.
347 static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb,
348 struct net_device *netdev)
350 struct peak_usb_device *dev = netdev_priv(netdev);
351 struct peak_tx_urb_context *context = NULL;
352 struct net_device_stats *stats = &netdev->stats;
353 struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
357 size_t size = dev->adapter->tx_buffer_size;
359 if (can_dropped_invalid_skb(netdev, skb))
362 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
363 if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) {
364 context = dev->tx_contexts + i;
369 /* should not occur except during restart */
370 return NETDEV_TX_BUSY;
374 obuf = urb->transfer_buffer;
376 err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size);
379 netdev_err(netdev, "packet dropped\n");
385 context->echo_index = i;
387 /* Note: this works with CANFD frames too */
388 context->data_len = cfd->len;
390 usb_anchor_urb(urb, &dev->tx_submitted);
392 can_put_echo_skb(skb, netdev, context->echo_index);
394 atomic_inc(&dev->active_tx_urbs);
396 err = usb_submit_urb(urb, GFP_ATOMIC);
398 can_free_echo_skb(netdev, context->echo_index);
400 usb_unanchor_urb(urb);
402 /* this context is not used in fact */
403 context->echo_index = PCAN_USB_MAX_TX_URBS;
405 atomic_dec(&dev->active_tx_urbs);
409 netif_device_detach(netdev);
412 netdev_warn(netdev, "tx urb submitting failed err=%d\n",
415 /* cable unplugged */
419 netif_trans_update(netdev);
421 /* slow down tx path */
422 if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS)
423 netif_stop_queue(netdev);
430 * start the CAN interface.
431 * Rx and Tx urbs are allocated here. Rx urbs are submitted here.
433 static int peak_usb_start(struct peak_usb_device *dev)
435 struct net_device *netdev = dev->netdev;
438 for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) {
442 /* create a URB, and a buffer for it, to receive usb messages */
443 urb = usb_alloc_urb(0, GFP_KERNEL);
449 buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL);
456 usb_fill_bulk_urb(urb, dev->udev,
457 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
458 buf, dev->adapter->rx_buffer_size,
459 peak_usb_read_bulk_callback, dev);
461 /* ask last usb_free_urb() to also kfree() transfer_buffer */
462 urb->transfer_flags |= URB_FREE_BUFFER;
463 usb_anchor_urb(urb, &dev->rx_submitted);
465 err = usb_submit_urb(urb, GFP_KERNEL);
468 netif_device_detach(dev->netdev);
470 usb_unanchor_urb(urb);
476 /* drop reference, USB core will take care of freeing it */
480 /* did we submit any URBs? Warn if we was not able to submit all urbs */
481 if (i < PCAN_USB_MAX_RX_URBS) {
483 netdev_err(netdev, "couldn't setup any rx URB\n");
487 netdev_warn(netdev, "rx performance may be slow\n");
490 /* pre-alloc tx buffers and corresponding urbs */
491 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
492 struct peak_tx_urb_context *context;
496 /* create a URB and a buffer for it, to transmit usb messages */
497 urb = usb_alloc_urb(0, GFP_KERNEL);
503 buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL);
510 context = dev->tx_contexts + i;
514 usb_fill_bulk_urb(urb, dev->udev,
515 usb_sndbulkpipe(dev->udev, dev->ep_msg_out),
516 buf, dev->adapter->tx_buffer_size,
517 peak_usb_write_bulk_callback, context);
519 /* ask last usb_free_urb() to also kfree() transfer_buffer */
520 urb->transfer_flags |= URB_FREE_BUFFER;
523 /* warn if we were not able to allocate enough tx contexts */
524 if (i < PCAN_USB_MAX_TX_URBS) {
526 netdev_err(netdev, "couldn't setup any tx URB\n");
530 netdev_warn(netdev, "tx performance may be slow\n");
533 if (dev->adapter->dev_start) {
534 err = dev->adapter->dev_start(dev);
539 dev->state |= PCAN_USB_STATE_STARTED;
541 /* can set bus on now */
542 if (dev->adapter->dev_set_bus) {
543 err = dev->adapter->dev_set_bus(dev, 1);
548 dev->can.state = CAN_STATE_ERROR_ACTIVE;
554 netif_device_detach(dev->netdev);
556 netdev_warn(netdev, "couldn't submit control: %d\n", err);
558 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
559 usb_free_urb(dev->tx_contexts[i].urb);
560 dev->tx_contexts[i].urb = NULL;
563 usb_kill_anchored_urbs(&dev->rx_submitted);
569 * called by netdev to open the corresponding CAN interface.
571 static int peak_usb_ndo_open(struct net_device *netdev)
573 struct peak_usb_device *dev = netdev_priv(netdev);
577 err = open_candev(netdev);
581 /* finally start device */
582 err = peak_usb_start(dev);
584 netdev_err(netdev, "couldn't start device: %d\n", err);
585 close_candev(netdev);
589 netif_start_queue(netdev);
595 * unlink in-flight Rx and Tx urbs and free their memory.
597 static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev)
601 /* free all Rx (submitted) urbs */
602 usb_kill_anchored_urbs(&dev->rx_submitted);
604 /* free unsubmitted Tx urbs first */
605 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
606 struct urb *urb = dev->tx_contexts[i].urb;
609 dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) {
611 * this urb is already released or always submitted,
612 * let usb core free by itself
618 dev->tx_contexts[i].urb = NULL;
621 /* then free all submitted Tx urbs */
622 usb_kill_anchored_urbs(&dev->tx_submitted);
623 atomic_set(&dev->active_tx_urbs, 0);
627 * called by netdev to close the corresponding CAN interface.
629 static int peak_usb_ndo_stop(struct net_device *netdev)
631 struct peak_usb_device *dev = netdev_priv(netdev);
633 dev->state &= ~PCAN_USB_STATE_STARTED;
634 netif_stop_queue(netdev);
636 close_candev(netdev);
638 dev->can.state = CAN_STATE_STOPPED;
640 /* unlink all pending urbs and free used memory */
641 peak_usb_unlink_all_urbs(dev);
643 if (dev->adapter->dev_stop)
644 dev->adapter->dev_stop(dev);
646 /* can set bus off now */
647 if (dev->adapter->dev_set_bus) {
648 int err = dev->adapter->dev_set_bus(dev, 0);
657 * handle end of waiting for the device to reset
659 void peak_usb_restart_complete(struct peak_usb_device *dev)
661 /* finally MUST update can state */
662 dev->can.state = CAN_STATE_ERROR_ACTIVE;
664 /* netdev queue can be awaken now */
665 netif_wake_queue(dev->netdev);
668 void peak_usb_async_complete(struct urb *urb)
670 kfree(urb->transfer_buffer);
675 * device (auto-)restart mechanism runs in a timer context =>
676 * MUST handle restart with asynchronous usb transfers
678 static int peak_usb_restart(struct peak_usb_device *dev)
685 * if device doesn't define any asynchronous restart handler, simply
686 * wake the netdev queue up
688 if (!dev->adapter->dev_restart_async) {
689 peak_usb_restart_complete(dev);
693 /* first allocate a urb to handle the asynchronous steps */
694 urb = usb_alloc_urb(0, GFP_ATOMIC);
698 /* also allocate enough space for the commands to send */
699 buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC);
705 /* call the device specific handler for the restart */
706 err = dev->adapter->dev_restart_async(dev, urb, buf);
717 * candev callback used to change CAN mode.
718 * Warning: this is called from a timer context!
720 static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode)
722 struct peak_usb_device *dev = netdev_priv(netdev);
727 err = peak_usb_restart(dev);
729 netdev_err(netdev, "couldn't start device (err %d)\n",
741 * candev callback used to set device nominal/arbitration bitrate.
743 static int peak_usb_set_bittiming(struct net_device *netdev)
745 struct peak_usb_device *dev = netdev_priv(netdev);
746 const struct peak_usb_adapter *pa = dev->adapter;
748 if (pa->dev_set_bittiming) {
749 struct can_bittiming *bt = &dev->can.bittiming;
750 int err = pa->dev_set_bittiming(dev, bt);
753 netdev_info(netdev, "couldn't set bitrate (err %d)\n",
762 * candev callback used to set device data bitrate.
764 static int peak_usb_set_data_bittiming(struct net_device *netdev)
766 struct peak_usb_device *dev = netdev_priv(netdev);
767 const struct peak_usb_adapter *pa = dev->adapter;
769 if (pa->dev_set_data_bittiming) {
770 struct can_bittiming *bt = &dev->can.data_bittiming;
771 int err = pa->dev_set_data_bittiming(dev, bt);
775 "couldn't set data bitrate (err %d)\n",
784 static const struct net_device_ops peak_usb_netdev_ops = {
785 .ndo_open = peak_usb_ndo_open,
786 .ndo_stop = peak_usb_ndo_stop,
787 .ndo_start_xmit = peak_usb_ndo_start_xmit,
788 .ndo_change_mtu = can_change_mtu,
792 * create one device which is attached to CAN controller #ctrl_idx of the
795 static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
796 struct usb_interface *intf, int ctrl_idx)
798 struct usb_device *usb_dev = interface_to_usbdev(intf);
799 int sizeof_candev = peak_usb_adapter->sizeof_dev_private;
800 struct peak_usb_device *dev;
801 struct net_device *netdev;
805 if (sizeof_candev < sizeof(struct peak_usb_device))
806 sizeof_candev = sizeof(struct peak_usb_device);
808 netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS);
810 dev_err(&intf->dev, "%s: couldn't alloc candev\n",
811 PCAN_USB_DRIVER_NAME);
815 dev = netdev_priv(netdev);
817 /* allocate a buffer large enough to send commands */
818 dev->cmd_buf = kzalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
821 goto lbl_free_candev;
825 dev->netdev = netdev;
826 dev->adapter = peak_usb_adapter;
827 dev->ctrl_idx = ctrl_idx;
828 dev->state = PCAN_USB_STATE_CONNECTED;
830 dev->ep_msg_in = peak_usb_adapter->ep_msg_in;
831 dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
833 dev->can.clock = peak_usb_adapter->clock;
834 dev->can.bittiming_const = peak_usb_adapter->bittiming_const;
835 dev->can.do_set_bittiming = peak_usb_set_bittiming;
836 dev->can.data_bittiming_const = peak_usb_adapter->data_bittiming_const;
837 dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
838 dev->can.do_set_mode = peak_usb_set_mode;
839 dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
840 dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
842 netdev->netdev_ops = &peak_usb_netdev_ops;
844 netdev->flags |= IFF_ECHO; /* we support local echo */
846 init_usb_anchor(&dev->rx_submitted);
848 init_usb_anchor(&dev->tx_submitted);
849 atomic_set(&dev->active_tx_urbs, 0);
851 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
852 dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS;
854 dev->prev_siblings = usb_get_intfdata(intf);
855 usb_set_intfdata(intf, dev);
857 SET_NETDEV_DEV(netdev, &intf->dev);
858 netdev->dev_id = ctrl_idx;
860 err = register_candev(netdev);
862 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
863 goto lbl_restore_intf_data;
866 if (dev->prev_siblings)
867 (dev->prev_siblings)->next_siblings = dev;
869 /* keep hw revision into the netdevice */
870 tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice);
871 dev->device_rev = tmp16 >> 8;
873 if (dev->adapter->dev_init) {
874 err = dev->adapter->dev_init(dev);
876 goto lbl_unregister_candev;
880 if (dev->adapter->dev_set_bus) {
881 err = dev->adapter->dev_set_bus(dev, 0);
886 /* get device number early */
887 if (dev->adapter->dev_get_device_id)
888 dev->adapter->dev_get_device_id(dev, &dev->device_number);
890 netdev_info(netdev, "attached to %s channel %u (device %u)\n",
891 peak_usb_adapter->name, ctrl_idx, dev->device_number);
896 if (dev->adapter->dev_free)
897 dev->adapter->dev_free(dev);
899 lbl_unregister_candev:
900 unregister_candev(netdev);
902 lbl_restore_intf_data:
903 usb_set_intfdata(intf, dev->prev_siblings);
913 * called by the usb core when the device is unplugged from the system
915 static void peak_usb_disconnect(struct usb_interface *intf)
917 struct peak_usb_device *dev;
918 struct peak_usb_device *dev_prev_siblings;
920 /* unregister as many netdev devices as siblings */
921 for (dev = usb_get_intfdata(intf); dev; dev = dev_prev_siblings) {
922 struct net_device *netdev = dev->netdev;
925 dev_prev_siblings = dev->prev_siblings;
926 dev->state &= ~PCAN_USB_STATE_CONNECTED;
927 strlcpy(name, netdev->name, IFNAMSIZ);
929 unregister_netdev(netdev);
932 dev->next_siblings = NULL;
933 if (dev->adapter->dev_free)
934 dev->adapter->dev_free(dev);
937 dev_info(&intf->dev, "%s removed\n", name);
940 usb_set_intfdata(intf, NULL);
944 * probe function for new PEAK-System devices
946 static int peak_usb_probe(struct usb_interface *intf,
947 const struct usb_device_id *id)
949 struct usb_device *usb_dev = interface_to_usbdev(intf);
950 const u16 usb_id_product = le16_to_cpu(usb_dev->descriptor.idProduct);
951 const struct peak_usb_adapter *peak_usb_adapter = NULL;
952 int i, err = -ENOMEM;
954 usb_dev = interface_to_usbdev(intf);
956 /* get corresponding PCAN-USB adapter */
957 for (i = 0; i < ARRAY_SIZE(peak_usb_adapters_list); i++)
958 if (peak_usb_adapters_list[i]->device_id == usb_id_product) {
959 peak_usb_adapter = peak_usb_adapters_list[i];
963 if (!peak_usb_adapter) {
964 /* should never come except device_id bad usage in this file */
965 pr_err("%s: didn't find device id. 0x%x in devices list\n",
966 PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct);
970 /* got corresponding adapter: check if it handles current interface */
971 if (peak_usb_adapter->intf_probe) {
972 err = peak_usb_adapter->intf_probe(intf);
977 for (i = 0; i < peak_usb_adapter->ctrl_count; i++) {
978 err = peak_usb_create_dev(peak_usb_adapter, intf, i);
980 /* deregister already created devices */
981 peak_usb_disconnect(intf);
989 /* usb specific object needed to register this driver with the usb subsystem */
990 static struct usb_driver peak_usb_driver = {
991 .name = PCAN_USB_DRIVER_NAME,
992 .disconnect = peak_usb_disconnect,
993 .probe = peak_usb_probe,
994 .id_table = peak_usb_table,
997 static int __init peak_usb_init(void)
1001 /* register this driver with the USB subsystem */
1002 err = usb_register(&peak_usb_driver);
1004 pr_err("%s: usb_register failed (err %d)\n",
1005 PCAN_USB_DRIVER_NAME, err);
1010 static int peak_usb_do_device_exit(struct device *d, void *arg)
1012 struct usb_interface *intf = to_usb_interface(d);
1013 struct peak_usb_device *dev;
1015 /* stop as many netdev devices as siblings */
1016 for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
1017 struct net_device *netdev = dev->netdev;
1019 if (netif_device_present(netdev))
1020 if (dev->adapter->dev_exit)
1021 dev->adapter->dev_exit(dev);
1027 static void __exit peak_usb_exit(void)
1031 /* last chance do send any synchronous commands here */
1032 err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL,
1033 NULL, peak_usb_do_device_exit);
1035 pr_err("%s: failed to stop all can devices (err %d)\n",
1036 PCAN_USB_DRIVER_NAME, err);
1038 /* deregister this driver with the USB subsystem */
1039 usb_deregister(&peak_usb_driver);
1041 pr_info("%s: PCAN-USB interfaces driver unloaded\n",
1042 PCAN_USB_DRIVER_NAME);
1045 module_init(peak_usb_init);
1046 module_exit(peak_usb_exit);