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 <socketcan/can.h>
27 #include <socketcan/can/dev.h>
28 #include <socketcan/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 {
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;
223 static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
224 struct esd_usb2_msg *msg)
226 struct net_device_stats *stats = &priv->netdev->stats;
227 struct can_frame *cf;
229 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
231 if (id == ESD_EV_CAN_ERROR_EXT) {
232 u8 state = msg->msg.rx.data[0];
233 u8 ecc = msg->msg.rx.data[1];
234 u8 txerr = msg->msg.rx.data[2];
235 u8 rxerr = msg->msg.rx.data[3];
237 skb = alloc_can_err_skb(priv->netdev, &cf);
243 if (state != priv->old_state) {
244 priv->old_state = state;
246 switch (state & ESD_BUSSTATE_MASK) {
247 case ESD_BUSSTATE_BUSOFF:
248 priv->can.state = CAN_STATE_BUS_OFF;
249 cf->can_id |= CAN_ERR_BUSOFF;
250 can_bus_off(priv->netdev);
252 case ESD_BUSSTATE_WARN:
253 priv->can.state = CAN_STATE_ERROR_WARNING;
254 priv->can.can_stats.error_warning++;
256 case ESD_BUSSTATE_ERRPASSIVE:
257 priv->can.state = CAN_STATE_ERROR_PASSIVE;
258 priv->can.can_stats.error_passive++;
261 priv->can.state = CAN_STATE_ERROR_ACTIVE;
265 priv->can.can_stats.bus_error++;
268 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
270 switch (ecc & SJA1000_ECC_MASK) {
271 case SJA1000_ECC_BIT:
272 cf->data[2] |= CAN_ERR_PROT_BIT;
274 case SJA1000_ECC_FORM:
275 cf->data[2] |= CAN_ERR_PROT_FORM;
277 case SJA1000_ECC_STUFF:
278 cf->data[2] |= CAN_ERR_PROT_STUFF;
281 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
282 cf->data[3] = ecc & SJA1000_ECC_SEG;
286 /* Error occurred during transmission? */
287 if (!(ecc & SJA1000_ECC_DIR))
288 cf->data[2] |= CAN_ERR_PROT_TX;
290 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
291 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
292 cf->data[1] = (txerr > rxerr) ?
293 CAN_ERR_CRTL_TX_PASSIVE :
294 CAN_ERR_CRTL_RX_PASSIVE;
300 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
301 priv->netdev->last_rx = jiffies;
304 stats->rx_bytes += cf->can_dlc;
308 static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
309 struct esd_usb2_msg *msg)
311 struct net_device_stats *stats = &priv->netdev->stats;
312 struct can_frame *cf;
317 if (!netif_device_present(priv->netdev))
320 id = le32_to_cpu(msg->msg.rx.id);
322 if (id & ESD_EVENT) {
323 esd_usb2_rx_event(priv, msg);
325 skb = alloc_can_skb(priv->netdev, &cf);
331 cf->can_id = id & ESD_IDMASK;
332 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
335 cf->can_id |= CAN_EFF_FLAG;
337 if (msg->msg.rx.dlc & ESD_RTR) {
338 cf->can_id |= CAN_RTR_FLAG;
340 for (i = 0; i < cf->can_dlc; i++)
341 cf->data[i] = msg->msg.rx.data[i];
346 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
347 priv->netdev->last_rx = jiffies;
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 */
400 dev_info(dev->udev->dev.parent,
401 "Rx URB aborted (%d)\n", urb->status);
405 while (pos < urb->actual_length) {
406 struct esd_usb2_msg *msg;
408 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
410 switch (msg->msg.hdr.cmd) {
412 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
416 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
421 pos += msg->msg.hdr.len << 2;
423 if (pos > urb->actual_length) {
424 dev_err(dev->udev->dev.parent, "format error\n");
430 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
431 urb->transfer_buffer, RX_BUFFER_SIZE,
432 esd_usb2_read_bulk_callback, dev);
434 retval = usb_submit_urb(urb, GFP_ATOMIC);
435 if (retval == -ENODEV) {
436 for (i = 0; i < dev->net_count; i++) {
438 netif_device_detach(dev->nets[i]->netdev);
441 dev_err(dev->udev->dev.parent,
442 "failed resubmitting read bulk urb: %d\n", retval);
449 * callback for bulk IN urb
451 static void esd_usb2_write_bulk_callback(struct urb *urb)
453 struct esd_tx_urb_context *context = urb->context;
454 struct esd_usb2_net_priv *priv;
455 struct esd_usb2 *dev;
456 struct net_device *netdev;
457 size_t size = sizeof(struct esd_usb2_msg);
461 priv = context->priv;
462 netdev = priv->netdev;
465 /* free up our allocated buffer */
466 usb_buffer_free(urb->dev, size,
467 urb->transfer_buffer, urb->transfer_dma);
469 if (!netif_device_present(netdev))
473 dev_info(ND2D(netdev), "Tx URB aborted (%d)\n",
476 netdev->trans_start = jiffies;
480 static ssize_t show_firmware(struct device *d,
481 struct device_attribute *attr, char *buf)
483 struct usb_interface *intf = to_usb_interface(d);
484 struct esd_usb2 *dev = usb_get_intfdata(intf);
486 return sprintf(buf, "%d.%d.%d\n",
487 (dev->version >> 12) & 0xf,
488 (dev->version >> 8) & 0xf,
489 dev->version & 0xff);
491 static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
493 static ssize_t show_hardware(struct device *d,
494 struct device_attribute *attr, char *buf)
496 struct usb_interface *intf = to_usb_interface(d);
497 struct esd_usb2 *dev = usb_get_intfdata(intf);
499 return sprintf(buf, "%d.%d.%d\n",
500 (dev->version >> 28) & 0xf,
501 (dev->version >> 24) & 0xf,
502 (dev->version >> 16) & 0xff);
504 static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
506 static ssize_t show_nets(struct device *d,
507 struct device_attribute *attr, char *buf)
509 struct usb_interface *intf = to_usb_interface(d);
510 struct esd_usb2 *dev = usb_get_intfdata(intf);
512 return sprintf(buf, "%d", dev->net_count);
514 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_buffer_alloc(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_buffer_free(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(ND2D(netdev), "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 (i = 0; i < MAX_TX_URBS; i++)
674 priv->tx_contexts[i].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(ND2D(netdev), "couldn't start device: %d\n", err);
694 close_candev(netdev);
699 priv->open_time = jiffies;
701 netif_start_queue(netdev);
706 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
707 static int esd_usb2_start_xmit(struct sk_buff *skb, struct net_device *netdev)
709 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
710 struct net_device *netdev)
713 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
714 struct esd_usb2 *dev = priv->usb2;
715 struct esd_tx_urb_context *context = NULL;
716 struct net_device_stats *stats = &netdev->stats;
717 struct can_frame *cf = (struct can_frame *)skb->data;
718 struct esd_usb2_msg *msg;
722 int ret = NETDEV_TX_OK;
723 size_t size = sizeof(struct esd_usb2_msg);
725 /* create a URB, and a buffer for it, and copy the data to the URB */
726 urb = usb_alloc_urb(0, GFP_ATOMIC);
728 dev_err(ND2D(netdev), "No memory left for URBs\n");
734 buf = usb_buffer_alloc(dev->udev, size, GFP_ATOMIC, &urb->transfer_dma);
736 dev_err(ND2D(netdev), "No memory left for USB buffer\n");
742 msg = (struct esd_usb2_msg *)buf;
744 msg->msg.hdr.len = 3; /* minimal length */
745 msg->msg.hdr.cmd = CMD_CAN_TX;
746 msg->msg.tx.net = priv->index;
747 msg->msg.tx.dlc = cf->can_dlc;
748 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
750 if (cf->can_id & CAN_RTR_FLAG)
751 msg->msg.tx.dlc |= ESD_RTR;
753 if (cf->can_id & CAN_EFF_FLAG)
754 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
756 for (i = 0; i < cf->can_dlc; i++)
757 msg->msg.tx.data[i] = cf->data[i];
759 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
761 for (i = 0; i < MAX_TX_URBS; i++) {
762 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
763 context = &priv->tx_contexts[i];
769 * This may never happen.
772 dev_warn(ND2D(netdev), "couldn't find free context\n");
773 ret = NETDEV_TX_BUSY;
777 context->priv = priv;
778 context->echo_index = i;
779 context->dlc = cf->can_dlc;
781 /* hnd must not be 0 */
782 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
784 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
785 msg->msg.hdr.len << 2,
786 esd_usb2_write_bulk_callback, context);
788 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
790 usb_anchor_urb(urb, &priv->tx_submitted);
792 can_put_echo_skb(skb, netdev, context->echo_index);
794 atomic_inc(&priv->active_tx_jobs);
796 err = usb_submit_urb(urb, GFP_ATOMIC);
798 can_free_echo_skb(netdev, context->echo_index);
800 atomic_dec(&priv->active_tx_jobs);
801 usb_unanchor_urb(urb);
806 netif_device_detach(netdev);
808 dev_warn(ND2D(netdev), "failed tx_urb %d\n", err);
813 netdev->trans_start = jiffies;
815 /* Slow down tx path */
816 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
817 netif_stop_queue(netdev);
820 * Release our reference to this URB, the USB core will eventually free
828 usb_buffer_free(dev->udev, size, buf, urb->transfer_dma);
837 static int esd_usb2_close(struct net_device *netdev)
839 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
840 struct esd_usb2_msg msg;
843 /* Disable all IDs (see esd_usb2_start()) */
844 msg.msg.hdr.cmd = CMD_IDADD;
845 msg.msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
846 msg.msg.filter.net = priv->index;
847 msg.msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
848 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
849 msg.msg.filter.mask[i] = 0;
850 esd_usb2_send_msg(priv->usb2, &msg);
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 esd_usb2_send_msg(priv->usb2, &msg);
860 priv->can.state = CAN_STATE_STOPPED;
862 netif_stop_queue(netdev);
864 close_candev(netdev);
871 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
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,
879 static struct can_bittiming_const esd_usb2_bittiming_const = {
881 .tseg1_min = ESD_USB2_TSEG1_MIN,
882 .tseg1_max = ESD_USB2_TSEG1_MAX,
883 .tseg2_min = ESD_USB2_TSEG2_MIN,
884 .tseg2_max = ESD_USB2_TSEG2_MAX,
885 .sjw_max = ESD_USB2_SJW_MAX,
886 .brp_min = ESD_USB2_BRP_MIN,
887 .brp_max = ESD_USB2_BRP_MAX,
888 .brp_inc = ESD_USB2_BRP_INC,
891 static int esd_usb2_set_bittiming(struct net_device *netdev)
893 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
894 struct can_bittiming *bt = &priv->can.bittiming;
895 struct esd_usb2_msg msg;
898 canbtr = ESD_USB2_UBR;
899 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
900 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
901 << ESD_USB2_SJW_SHIFT;
902 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
903 & (ESD_USB2_TSEG1_MAX - 1))
904 << ESD_USB2_TSEG1_SHIFT;
905 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
906 << ESD_USB2_TSEG2_SHIFT;
907 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
908 canbtr |= ESD_USB2_3_SAMPLES;
911 msg.msg.hdr.cmd = CMD_SETBAUD;
912 msg.msg.setbaud.net = priv->index;
913 msg.msg.setbaud.rsvd = 0;
914 msg.msg.setbaud.baud = cpu_to_le32(canbtr);
916 dev_info(ND2D(netdev), "setting BTR=%#x\n", canbtr);
918 return esd_usb2_send_msg(priv->usb2, &msg);
921 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
923 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
925 if (!priv->open_time)
930 netif_wake_queue(netdev);
940 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
942 struct esd_usb2 *dev = usb_get_intfdata(intf);
943 struct net_device *netdev;
944 struct esd_usb2_net_priv *priv;
948 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
950 dev_err(&intf->dev, "couldn't alloc candev\n");
954 priv = netdev_priv(netdev);
956 init_usb_anchor(&priv->tx_submitted);
957 atomic_set(&priv->active_tx_jobs, 0);
959 for (i = 0; i < MAX_TX_URBS; i++)
960 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
963 priv->netdev = netdev;
966 priv->can.state = CAN_STATE_STOPPED;
967 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
968 priv->can.bittiming_const = &esd_usb2_bittiming_const;
969 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
970 priv->can.do_set_mode = esd_usb2_set_mode;
972 netdev->flags |= IFF_ECHO; /* we support local echo */
974 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,28)
975 netdev->netdev_ops = &esd_usb2_netdev_ops;
977 netdev->open = esd_usb2_open;
978 netdev->stop = esd_usb2_close;
979 netdev->hard_start_xmit = esd_usb2_start_xmit;
982 SET_NETDEV_DEV(netdev, &intf->dev);
984 err = register_candev(netdev);
987 "couldn't register CAN device: %d\n", err);
992 dev->nets[index] = priv;
993 dev_info(ND2D(netdev), "device %s registered\n", netdev->name);
998 * probe function for new USB2 devices
1000 * check version information and number of available
1003 static int esd_usb2_probe(struct usb_interface *intf,
1004 const struct usb_device_id *id)
1006 struct esd_usb2 *dev;
1007 struct esd_usb2_msg msg;
1008 int i, err = -ENOMEM;
1010 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1014 dev->udev = interface_to_usbdev(intf);
1016 init_usb_anchor(&dev->rx_submitted);
1018 usb_set_intfdata(intf, dev);
1020 /* query number of CAN interfaces (nets) */
1021 msg.msg.hdr.cmd = CMD_VERSION;
1022 msg.msg.hdr.len = 2;
1023 msg.msg.version.rsvd = 0;
1024 msg.msg.version.flags = 0;
1025 msg.msg.version.drv_version = 0;
1027 if (esd_usb2_send_msg(dev, &msg) < 0) {
1028 dev_err(&intf->dev, "sending version message failed\n");
1032 if (esd_usb2_wait_msg(dev, &msg) < 0) {
1033 dev_err(&intf->dev, "no version message answer\n");
1037 dev->net_count = (int)msg.msg.version_reply.nets;
1038 dev->version = le32_to_cpu(msg.msg.version_reply.version);
1041 if (device_create_file(&intf->dev, &dev_attr_firmware))
1043 "Couldn't create device file for firmware\n");
1045 if (device_create_file(&intf->dev, &dev_attr_hardware))
1047 "Couldn't create device file for hardware\n");
1049 if (device_create_file(&intf->dev, &dev_attr_nets))
1051 "Couldn't create device file for nets\n");
1054 /* do per device probing */
1055 for (i = 0; i < dev->net_count; i++)
1056 esd_usb2_probe_one_net(intf, i);
1066 * called by the usb core when the device is removed from the system
1068 static void esd_usb2_disconnect(struct usb_interface *intf)
1070 struct esd_usb2 *dev = usb_get_intfdata(intf);
1071 struct net_device *netdev;
1075 device_remove_file(&intf->dev, &dev_attr_firmware);
1076 device_remove_file(&intf->dev, &dev_attr_hardware);
1077 device_remove_file(&intf->dev, &dev_attr_nets);
1079 usb_set_intfdata(intf, NULL);
1082 for (i = 0; i < dev->net_count; i++) {
1084 netdev = dev->nets[i]->netdev;
1085 unregister_netdev(netdev);
1086 free_candev(netdev);
1089 unlink_all_urbs(dev);
1093 /* usb specific object needed to register this driver with the usb subsystem */
1094 static struct usb_driver esd_usb2_driver = {
1096 .probe = esd_usb2_probe,
1097 .disconnect = esd_usb2_disconnect,
1098 .id_table = esd_usb2_table,
1101 static int __init esd_usb2_init(void)
1105 /* register this driver with the USB subsystem */
1106 err = usb_register(&esd_usb2_driver);
1109 err("usb_register failed. Error number %d\n", err);
1115 module_init(esd_usb2_init);
1117 static void __exit esd_usb2_exit(void)
1119 /* deregister this driver with the USB subsystem */
1120 usb_deregister(&esd_usb2_driver);
1122 module_exit(esd_usb2_exit);