2 * CAN driver for esd CAN-USB/2
4 * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published
8 * by the Free Software Foundation; version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
31 MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 interfaces");
32 MODULE_LICENSE("GPL v2");
34 /* Define these values to match your devices */
35 #define USB_ESDGMBH_VENDOR_ID 0x0ab4
36 #define USB_CANUSB2_PRODUCT_ID 0x0010
38 #define ESD_USB2_CAN_CLOCK 60000000
39 #define ESD_USB2_MAX_NETS 2
42 #define CMD_VERSION 1 /* also used for VERSION_REPLY */
43 #define CMD_CAN_RX 2 /* device to host only */
44 #define CMD_CAN_TX 3 /* also used for TX_DONE */
45 #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */
46 #define CMD_TS 5 /* also used for TS_REPLY */
47 #define CMD_IDADD 6 /* also used for IDADD_REPLY */
49 /* esd CAN message flags - dlc field */
52 /* esd CAN message flags - id field */
53 #define ESD_EXTID 0x20000000
54 #define ESD_EVENT 0x40000000
55 #define ESD_IDMASK 0x1fffffff
57 /* esd CAN event ids used by this driver */
58 #define ESD_EV_CAN_ERROR_EXT 2
60 /* baudrate message flags */
61 #define ESD_USB2_UBR 0x80000000
62 #define ESD_USB2_LOM 0x40000000
63 #define ESD_USB2_NO_BAUDRATE 0x7fffffff
64 #define ESD_USB2_TSEG1_MIN 1
65 #define ESD_USB2_TSEG1_MAX 16
66 #define ESD_USB2_TSEG1_SHIFT 16
67 #define ESD_USB2_TSEG2_MIN 1
68 #define ESD_USB2_TSEG2_MAX 8
69 #define ESD_USB2_TSEG2_SHIFT 20
70 #define ESD_USB2_SJW_MAX 4
71 #define ESD_USB2_SJW_SHIFT 14
72 #define ESD_USB2_BRP_MIN 1
73 #define ESD_USB2_BRP_MAX 1024
74 #define ESD_USB2_BRP_INC 1
75 #define ESD_USB2_3_SAMPLES 0x00800000
77 /* esd IDADD message */
78 #define ESD_ID_ENABLE 0x80
79 #define ESD_MAX_ID_SEGMENT 64
81 /* SJA1000 ECC register (emulated by usb2 firmware) */
82 #define SJA1000_ECC_SEG 0x1F
83 #define SJA1000_ECC_DIR 0x20
84 #define SJA1000_ECC_ERR 0x06
85 #define SJA1000_ECC_BIT 0x00
86 #define SJA1000_ECC_FORM 0x40
87 #define SJA1000_ECC_STUFF 0x80
88 #define SJA1000_ECC_MASK 0xc0
90 /* esd bus state event codes */
91 #define ESD_BUSSTATE_MASK 0xc0
92 #define ESD_BUSSTATE_WARN 0x40
93 #define ESD_BUSSTATE_ERRPASSIVE 0x80
94 #define ESD_BUSSTATE_BUSOFF 0xc0
96 #define RX_BUFFER_SIZE 1024
98 #define MAX_TX_URBS 16 /* must be power of 2 */
101 u8 len; /* len is always the total message length in 32bit words */
114 struct version_reply_msg {
131 __le32 id; /* upper 3 bits contain flags */
141 __le32 id; /* upper 3 bits contain flags */
154 struct id_filter_msg {
159 __le32 mask[ESD_MAX_ID_SEGMENT + 1];
162 struct set_baudrate_msg {
170 /* Main message type used between library and application */
171 struct __attribute__ ((packed)) esd_usb2_msg {
173 struct header_msg hdr;
174 struct version_msg version;
175 struct version_reply_msg version_reply;
178 struct tx_done_msg txdone;
179 struct set_baudrate_msg setbaud;
180 struct id_filter_msg filter;
184 static struct usb_device_id esd_usb2_table[] = {
185 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
188 MODULE_DEVICE_TABLE(usb, esd_usb2_table);
190 struct esd_usb2_net_priv;
192 struct esd_tx_urb_context {
193 struct esd_usb2_net_priv *priv;
199 struct usb_device *udev;
200 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
202 struct usb_anchor rx_submitted;
209 struct esd_usb2_net_priv {
210 struct can_priv can; /* must be the first member */
212 atomic_t active_tx_jobs;
213 struct usb_anchor tx_submitted;
214 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
217 struct esd_usb2 *usb2;
218 struct net_device *netdev;
221 struct can_berr_counter bec;
224 static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
225 struct esd_usb2_msg *msg)
227 struct net_device_stats *stats = &priv->netdev->stats;
228 struct can_frame *cf;
230 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
232 if (id == ESD_EV_CAN_ERROR_EXT) {
233 u8 state = msg->msg.rx.data[0];
234 u8 ecc = msg->msg.rx.data[1];
235 u8 txerr = msg->msg.rx.data[2];
236 u8 rxerr = msg->msg.rx.data[3];
238 skb = alloc_can_err_skb(priv->netdev, &cf);
244 if (state != priv->old_state) {
245 priv->old_state = state;
247 switch (state & ESD_BUSSTATE_MASK) {
248 case ESD_BUSSTATE_BUSOFF:
249 priv->can.state = CAN_STATE_BUS_OFF;
250 cf->can_id |= CAN_ERR_BUSOFF;
251 can_bus_off(priv->netdev);
253 case ESD_BUSSTATE_WARN:
254 priv->can.state = CAN_STATE_ERROR_WARNING;
255 priv->can.can_stats.error_warning++;
257 case ESD_BUSSTATE_ERRPASSIVE:
258 priv->can.state = CAN_STATE_ERROR_PASSIVE;
259 priv->can.can_stats.error_passive++;
262 priv->can.state = CAN_STATE_ERROR_ACTIVE;
266 priv->can.can_stats.bus_error++;
269 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
271 switch (ecc & SJA1000_ECC_MASK) {
272 case SJA1000_ECC_BIT:
273 cf->data[2] |= CAN_ERR_PROT_BIT;
275 case SJA1000_ECC_FORM:
276 cf->data[2] |= CAN_ERR_PROT_FORM;
278 case SJA1000_ECC_STUFF:
279 cf->data[2] |= CAN_ERR_PROT_STUFF;
282 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
283 cf->data[3] = ecc & SJA1000_ECC_SEG;
287 /* Error occurred during transmission? */
288 if (!(ecc & SJA1000_ECC_DIR))
289 cf->data[2] |= CAN_ERR_PROT_TX;
291 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
292 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
293 cf->data[1] = (txerr > rxerr) ?
294 CAN_ERR_CRTL_TX_PASSIVE :
295 CAN_ERR_CRTL_RX_PASSIVE;
303 priv->bec.txerr = txerr;
304 priv->bec.rxerr = rxerr;
307 stats->rx_bytes += cf->can_dlc;
311 static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
312 struct esd_usb2_msg *msg)
314 struct net_device_stats *stats = &priv->netdev->stats;
315 struct can_frame *cf;
320 if (!netif_device_present(priv->netdev))
323 id = le32_to_cpu(msg->msg.rx.id);
325 if (id & ESD_EVENT) {
326 esd_usb2_rx_event(priv, msg);
328 skb = alloc_can_skb(priv->netdev, &cf);
334 cf->can_id = id & ESD_IDMASK;
335 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR);
338 cf->can_id |= CAN_EFF_FLAG;
340 if (msg->msg.rx.dlc & ESD_RTR) {
341 cf->can_id |= CAN_RTR_FLAG;
343 for (i = 0; i < cf->can_dlc; i++)
344 cf->data[i] = msg->msg.rx.data[i];
350 stats->rx_bytes += cf->can_dlc;
356 static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
357 struct esd_usb2_msg *msg)
359 struct net_device_stats *stats = &priv->netdev->stats;
360 struct net_device *netdev = priv->netdev;
361 struct esd_tx_urb_context *context;
363 if (!netif_device_present(netdev))
366 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
368 if (!msg->msg.txdone.status) {
370 stats->tx_bytes += context->dlc;
371 can_get_echo_skb(netdev, context->echo_index);
374 can_free_echo_skb(netdev, context->echo_index);
377 /* Release context */
378 context->echo_index = MAX_TX_URBS;
379 atomic_dec(&priv->active_tx_jobs);
381 netif_wake_queue(netdev);
384 static void esd_usb2_read_bulk_callback(struct urb *urb)
386 struct esd_usb2 *dev = urb->context;
391 switch (urb->status) {
392 case 0: /* success */
402 dev_info(dev->udev->dev.parent,
403 "Rx URB aborted (%d)\n", urb->status);
407 while (pos < urb->actual_length) {
408 struct esd_usb2_msg *msg;
410 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
412 switch (msg->msg.hdr.cmd) {
414 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
418 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
423 pos += msg->msg.hdr.len << 2;
425 if (pos > urb->actual_length) {
426 dev_err(dev->udev->dev.parent, "format error\n");
432 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
433 urb->transfer_buffer, RX_BUFFER_SIZE,
434 esd_usb2_read_bulk_callback, dev);
436 retval = usb_submit_urb(urb, GFP_ATOMIC);
437 if (retval == -ENODEV) {
438 for (i = 0; i < dev->net_count; i++) {
440 netif_device_detach(dev->nets[i]->netdev);
443 dev_err(dev->udev->dev.parent,
444 "failed resubmitting read bulk urb: %d\n", retval);
451 * callback for bulk IN urb
453 static void esd_usb2_write_bulk_callback(struct urb *urb)
455 struct esd_tx_urb_context *context = urb->context;
456 struct esd_usb2_net_priv *priv;
457 struct esd_usb2 *dev;
458 struct net_device *netdev;
459 size_t size = sizeof(struct esd_usb2_msg);
463 priv = context->priv;
464 netdev = priv->netdev;
467 /* free up our allocated buffer */
468 usb_free_coherent(urb->dev, size,
469 urb->transfer_buffer, urb->transfer_dma);
471 if (!netif_device_present(netdev))
475 dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n",
478 netdev->trans_start = jiffies;
481 static ssize_t show_firmware(struct device *d,
482 struct device_attribute *attr, char *buf)
484 struct usb_interface *intf = to_usb_interface(d);
485 struct esd_usb2 *dev = usb_get_intfdata(intf);
487 return sprintf(buf, "%d.%d.%d\n",
488 (dev->version >> 12) & 0xf,
489 (dev->version >> 8) & 0xf,
490 dev->version & 0xff);
492 static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
494 static ssize_t show_hardware(struct device *d,
495 struct device_attribute *attr, char *buf)
497 struct usb_interface *intf = to_usb_interface(d);
498 struct esd_usb2 *dev = usb_get_intfdata(intf);
500 return sprintf(buf, "%d.%d.%d\n",
501 (dev->version >> 28) & 0xf,
502 (dev->version >> 24) & 0xf,
503 (dev->version >> 16) & 0xff);
505 static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
507 static ssize_t show_nets(struct device *d,
508 struct device_attribute *attr, char *buf)
510 struct usb_interface *intf = to_usb_interface(d);
511 struct esd_usb2 *dev = usb_get_intfdata(intf);
513 return sprintf(buf, "%d", dev->net_count);
515 static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
517 static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
521 return usb_bulk_msg(dev->udev,
522 usb_sndbulkpipe(dev->udev, 2),
524 msg->msg.hdr.len << 2,
529 static int esd_usb2_wait_msg(struct esd_usb2 *dev,
530 struct esd_usb2_msg *msg)
534 return usb_bulk_msg(dev->udev,
535 usb_rcvbulkpipe(dev->udev, 1),
542 static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
549 for (i = 0; i < MAX_RX_URBS; i++) {
550 struct urb *urb = NULL;
553 /* create a URB, and a buffer for it */
554 urb = usb_alloc_urb(0, GFP_KERNEL);
556 dev_warn(dev->udev->dev.parent,
557 "No memory left for URBs\n");
562 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
565 dev_warn(dev->udev->dev.parent,
566 "No memory left for USB buffer\n");
571 usb_fill_bulk_urb(urb, dev->udev,
572 usb_rcvbulkpipe(dev->udev, 1),
574 esd_usb2_read_bulk_callback, dev);
575 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
576 usb_anchor_urb(urb, &dev->rx_submitted);
578 err = usb_submit_urb(urb, GFP_KERNEL);
580 usb_unanchor_urb(urb);
581 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
586 /* Drop reference, USB core will take care of freeing it */
592 /* Did we submit any URBs */
594 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
598 /* Warn if we've couldn't transmit all the URBs */
599 if (i < MAX_RX_URBS) {
600 dev_warn(dev->udev->dev.parent,
601 "rx performance may be slow\n");
611 static int esd_usb2_start(struct esd_usb2_net_priv *priv)
613 struct esd_usb2 *dev = priv->usb2;
614 struct net_device *netdev = priv->netdev;
615 struct esd_usb2_msg msg;
620 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
621 * Each bit represents one 11 bit CAN identifier. A set bit
622 * enables reception of the corresponding CAN identifier. A cleared
623 * bit disabled this identifier. An additional bitmask value
624 * following the CAN 2.0A bits is used to enable reception of
625 * extended CAN frames. Only the LSB of this final mask is checked
626 * for the complete 29 bit ID range. The IDADD message also allows
627 * filter configuration for an ID subset. In this case you can add
628 * the number of the starting bitmask (0..64) to the filter.option
629 * field followed by only some bitmasks.
631 msg.msg.hdr.cmd = CMD_IDADD;
632 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
633 msg.msg.filter.net = priv->index;
634 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
635 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
636 msg.msg.filter.mask[i] = cpu_to_le32(0xffffffff);
637 /* enable 29bit extended IDs */
638 msg.msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
640 err = esd_usb2_send_msg(dev, &msg);
644 err = esd_usb2_setup_rx_urbs(dev);
648 priv->can.state = CAN_STATE_ERROR_ACTIVE;
654 netif_device_detach(netdev);
656 dev_err(netdev->dev.parent, "couldn't start device: %d\n", err);
661 static void unlink_all_urbs(struct esd_usb2 *dev)
663 struct esd_usb2_net_priv *priv;
666 usb_kill_anchored_urbs(&dev->rx_submitted);
667 for (i = 0; i < dev->net_count; i++) {
670 usb_kill_anchored_urbs(&priv->tx_submitted);
671 atomic_set(&priv->active_tx_jobs, 0);
673 for (j = 0; j < MAX_TX_URBS; j++)
674 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
679 static int esd_usb2_open(struct net_device *netdev)
681 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
685 err = open_candev(netdev);
689 /* finally start device */
690 err = esd_usb2_start(priv);
692 dev_warn(netdev->dev.parent,
693 "couldn't start device: %d\n", err);
694 close_candev(netdev);
698 priv->open_time = jiffies;
700 netif_start_queue(netdev);
705 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
706 struct net_device *netdev)
708 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
709 struct esd_usb2 *dev = priv->usb2;
710 struct esd_tx_urb_context *context = NULL;
711 struct net_device_stats *stats = &netdev->stats;
712 struct can_frame *cf = (struct can_frame *)skb->data;
713 struct esd_usb2_msg *msg;
717 int ret = NETDEV_TX_OK;
718 size_t size = sizeof(struct esd_usb2_msg);
720 if (can_dropped_invalid_skb(netdev, skb))
723 /* create a URB, and a buffer for it, and copy the data to the URB */
724 urb = usb_alloc_urb(0, GFP_ATOMIC);
726 dev_err(netdev->dev.parent, "No memory left for URBs\n");
732 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
735 dev_err(netdev->dev.parent, "No memory left for USB buffer\n");
741 msg = (struct esd_usb2_msg *)buf;
743 msg->msg.hdr.len = 3; /* minimal length */
744 msg->msg.hdr.cmd = CMD_CAN_TX;
745 msg->msg.tx.net = priv->index;
746 msg->msg.tx.dlc = cf->can_dlc;
747 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
749 if (cf->can_id & CAN_RTR_FLAG)
750 msg->msg.tx.dlc |= ESD_RTR;
752 if (cf->can_id & CAN_EFF_FLAG)
753 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
755 for (i = 0; i < cf->can_dlc; i++)
756 msg->msg.tx.data[i] = cf->data[i];
758 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
760 for (i = 0; i < MAX_TX_URBS; i++) {
761 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
762 context = &priv->tx_contexts[i];
768 * This may never happen.
771 dev_warn(netdev->dev.parent, "couldn't find free context\n");
772 ret = NETDEV_TX_BUSY;
776 context->priv = priv;
777 context->echo_index = i;
778 context->dlc = cf->can_dlc;
780 /* hnd must not be 0 - MSB is stripped in txdone handling */
781 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
783 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
784 msg->msg.hdr.len << 2,
785 esd_usb2_write_bulk_callback, context);
787 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
789 usb_anchor_urb(urb, &priv->tx_submitted);
791 can_put_echo_skb(skb, netdev, context->echo_index);
793 atomic_inc(&priv->active_tx_jobs);
795 /* Slow down tx path */
796 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
797 netif_stop_queue(netdev);
799 err = usb_submit_urb(urb, GFP_ATOMIC);
801 can_free_echo_skb(netdev, context->echo_index);
803 atomic_dec(&priv->active_tx_jobs);
804 usb_unanchor_urb(urb);
809 netif_device_detach(netdev);
811 dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err);
816 netdev->trans_start = jiffies;
819 * Release our reference to this URB, the USB core will eventually free
827 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
836 static int esd_usb2_close(struct net_device *netdev)
838 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
839 struct esd_usb2_msg msg;
842 /* Disable all IDs (see esd_usb2_start()) */
843 msg.msg.hdr.cmd = CMD_IDADD;
844 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
845 msg.msg.filter.net = priv->index;
846 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
847 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
848 msg.msg.filter.mask[i] = 0;
849 if (esd_usb2_send_msg(priv->usb2, &msg) < 0)
850 dev_err(netdev->dev.parent, "sending idadd message failed\n");
852 /* set CAN controller to reset mode */
854 msg.msg.hdr.cmd = CMD_SETBAUD;
855 msg.msg.setbaud.net = priv->index;
856 msg.msg.setbaud.rsvd = 0;
857 msg.msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
858 if (esd_usb2_send_msg(priv->usb2, &msg) < 0)
859 dev_err(netdev->dev.parent, "sending setbaud message failed\n");
861 priv->can.state = CAN_STATE_STOPPED;
863 netif_stop_queue(netdev);
865 close_candev(netdev);
872 static const struct net_device_ops esd_usb2_netdev_ops = {
873 .ndo_open = esd_usb2_open,
874 .ndo_stop = esd_usb2_close,
875 .ndo_start_xmit = esd_usb2_start_xmit,
878 static struct can_bittiming_const esd_usb2_bittiming_const = {
880 .tseg1_min = ESD_USB2_TSEG1_MIN,
881 .tseg1_max = ESD_USB2_TSEG1_MAX,
882 .tseg2_min = ESD_USB2_TSEG2_MIN,
883 .tseg2_max = ESD_USB2_TSEG2_MAX,
884 .sjw_max = ESD_USB2_SJW_MAX,
885 .brp_min = ESD_USB2_BRP_MIN,
886 .brp_max = ESD_USB2_BRP_MAX,
887 .brp_inc = ESD_USB2_BRP_INC,
890 static int esd_usb2_set_bittiming(struct net_device *netdev)
892 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
893 struct can_bittiming *bt = &priv->can.bittiming;
894 struct esd_usb2_msg msg;
897 canbtr = ESD_USB2_UBR;
898 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
899 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
900 << ESD_USB2_SJW_SHIFT;
901 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
902 & (ESD_USB2_TSEG1_MAX - 1))
903 << ESD_USB2_TSEG1_SHIFT;
904 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
905 << ESD_USB2_TSEG2_SHIFT;
906 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
907 canbtr |= ESD_USB2_3_SAMPLES;
910 msg.msg.hdr.cmd = CMD_SETBAUD;
911 msg.msg.setbaud.net = priv->index;
912 msg.msg.setbaud.rsvd = 0;
913 msg.msg.setbaud.baud = cpu_to_le32(canbtr);
915 dev_info(netdev->dev.parent, "setting BTR=%#x\n", canbtr);
917 return esd_usb2_send_msg(priv->usb2, &msg);
920 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
921 struct can_berr_counter *bec)
923 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
925 bec->txerr = priv->bec.txerr;
926 bec->rxerr = priv->bec.rxerr;
931 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
933 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
935 if (!priv->open_time)
940 netif_wake_queue(netdev);
950 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
952 struct esd_usb2 *dev = usb_get_intfdata(intf);
953 struct net_device *netdev;
954 struct esd_usb2_net_priv *priv;
958 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
960 dev_err(&intf->dev, "couldn't alloc candev\n");
965 priv = netdev_priv(netdev);
967 init_usb_anchor(&priv->tx_submitted);
968 atomic_set(&priv->active_tx_jobs, 0);
970 for (i = 0; i < MAX_TX_URBS; i++)
971 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
974 priv->netdev = netdev;
977 priv->can.state = CAN_STATE_STOPPED;
978 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
979 priv->can.bittiming_const = &esd_usb2_bittiming_const;
980 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
981 priv->can.do_set_mode = esd_usb2_set_mode;
982 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
983 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
985 netdev->flags |= IFF_ECHO; /* we support local echo */
987 netdev->netdev_ops = &esd_usb2_netdev_ops;
989 SET_NETDEV_DEV(netdev, &intf->dev);
991 err = register_candev(netdev);
994 "couldn't register CAN device: %d\n", err);
1000 dev->nets[index] = priv;
1001 dev_info(netdev->dev.parent, "device %s registered\n", netdev->name);
1008 * probe function for new USB2 devices
1010 * check version information and number of available
1013 static int esd_usb2_probe(struct usb_interface *intf,
1014 const struct usb_device_id *id)
1016 struct esd_usb2 *dev;
1017 struct esd_usb2_msg msg;
1020 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1026 dev->udev = interface_to_usbdev(intf);
1028 init_usb_anchor(&dev->rx_submitted);
1030 usb_set_intfdata(intf, dev);
1032 /* query number of CAN interfaces (nets) */
1033 msg.msg.hdr.cmd = CMD_VERSION;
1034 msg.msg.hdr.len = 2;
1035 msg.msg.version.rsvd = 0;
1036 msg.msg.version.flags = 0;
1037 msg.msg.version.drv_version = 0;
1039 err = esd_usb2_send_msg(dev, &msg);
1041 dev_err(&intf->dev, "sending version message failed\n");
1045 err = esd_usb2_wait_msg(dev, &msg);
1047 dev_err(&intf->dev, "no version message answer\n");
1051 dev->net_count = (int)msg.msg.version_reply.nets;
1052 dev->version = le32_to_cpu(msg.msg.version_reply.version);
1054 if (device_create_file(&intf->dev, &dev_attr_firmware))
1056 "Couldn't create device file for firmware\n");
1058 if (device_create_file(&intf->dev, &dev_attr_hardware))
1060 "Couldn't create device file for hardware\n");
1062 if (device_create_file(&intf->dev, &dev_attr_nets))
1064 "Couldn't create device file for nets\n");
1066 /* do per device probing */
1067 for (i = 0; i < dev->net_count; i++)
1068 esd_usb2_probe_one_net(intf, i);
1079 * called by the usb core when the device is removed from the system
1081 static void esd_usb2_disconnect(struct usb_interface *intf)
1083 struct esd_usb2 *dev = usb_get_intfdata(intf);
1084 struct net_device *netdev;
1087 device_remove_file(&intf->dev, &dev_attr_firmware);
1088 device_remove_file(&intf->dev, &dev_attr_hardware);
1089 device_remove_file(&intf->dev, &dev_attr_nets);
1091 usb_set_intfdata(intf, NULL);
1094 for (i = 0; i < dev->net_count; i++) {
1096 netdev = dev->nets[i]->netdev;
1097 unregister_netdev(netdev);
1098 free_candev(netdev);
1101 unlink_all_urbs(dev);
1106 /* usb specific object needed to register this driver with the usb subsystem */
1107 static struct usb_driver esd_usb2_driver = {
1109 .probe = esd_usb2_probe,
1110 .disconnect = esd_usb2_disconnect,
1111 .id_table = esd_usb2_table,
1114 static int __init esd_usb2_init(void)
1118 /* register this driver with the USB subsystem */
1119 err = usb_register(&esd_usb2_driver);
1122 err("usb_register failed. Error number %d\n", err);
1128 module_init(esd_usb2_init);
1130 static void __exit esd_usb2_exit(void)
1132 /* deregister this driver with the USB subsystem */
1133 usb_deregister(&esd_usb2_driver);
1135 module_exit(esd_usb2_exit);