2 * CAN driver for esd CAN-USB/2 and CAN-USB/Micro
4 * Copyright (C) 2010-2012 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/signal.h>
20 #include <linux/slab.h>
21 #include <linux/module.h>
22 #include <linux/netdevice.h>
23 #include <linux/usb.h>
25 #include <linux/can.h>
26 #include <linux/can/dev.h>
27 #include <linux/can/error.h>
29 MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
30 MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces");
31 MODULE_LICENSE("GPL v2");
33 /* Define these values to match your devices */
34 #define USB_ESDGMBH_VENDOR_ID 0x0ab4
35 #define USB_CANUSB2_PRODUCT_ID 0x0010
36 #define USB_CANUSBM_PRODUCT_ID 0x0011
38 #define ESD_USB2_CAN_CLOCK 60000000
39 #define ESD_USBM_CAN_CLOCK 36000000
40 #define ESD_USB2_MAX_NETS 2
43 #define CMD_VERSION 1 /* also used for VERSION_REPLY */
44 #define CMD_CAN_RX 2 /* device to host only */
45 #define CMD_CAN_TX 3 /* also used for TX_DONE */
46 #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */
47 #define CMD_TS 5 /* also used for TS_REPLY */
48 #define CMD_IDADD 6 /* also used for IDADD_REPLY */
50 /* esd CAN message flags - dlc field */
53 /* esd CAN message flags - id field */
54 #define ESD_EXTID 0x20000000
55 #define ESD_EVENT 0x40000000
56 #define ESD_IDMASK 0x1fffffff
58 /* esd CAN event ids used by this driver */
59 #define ESD_EV_CAN_ERROR_EXT 2
61 /* baudrate message flags */
62 #define ESD_USB2_UBR 0x80000000
63 #define ESD_USB2_LOM 0x40000000
64 #define ESD_USB2_NO_BAUDRATE 0x7fffffff
65 #define ESD_USB2_TSEG1_MIN 1
66 #define ESD_USB2_TSEG1_MAX 16
67 #define ESD_USB2_TSEG1_SHIFT 16
68 #define ESD_USB2_TSEG2_MIN 1
69 #define ESD_USB2_TSEG2_MAX 8
70 #define ESD_USB2_TSEG2_SHIFT 20
71 #define ESD_USB2_SJW_MAX 4
72 #define ESD_USB2_SJW_SHIFT 14
73 #define ESD_USBM_SJW_SHIFT 24
74 #define ESD_USB2_BRP_MIN 1
75 #define ESD_USB2_BRP_MAX 1024
76 #define ESD_USB2_BRP_INC 1
77 #define ESD_USB2_3_SAMPLES 0x00800000
79 /* esd IDADD message */
80 #define ESD_ID_ENABLE 0x80
81 #define ESD_MAX_ID_SEGMENT 64
83 /* SJA1000 ECC register (emulated by usb2 firmware) */
84 #define SJA1000_ECC_SEG 0x1F
85 #define SJA1000_ECC_DIR 0x20
86 #define SJA1000_ECC_ERR 0x06
87 #define SJA1000_ECC_BIT 0x00
88 #define SJA1000_ECC_FORM 0x40
89 #define SJA1000_ECC_STUFF 0x80
90 #define SJA1000_ECC_MASK 0xc0
92 /* esd bus state event codes */
93 #define ESD_BUSSTATE_MASK 0xc0
94 #define ESD_BUSSTATE_WARN 0x40
95 #define ESD_BUSSTATE_ERRPASSIVE 0x80
96 #define ESD_BUSSTATE_BUSOFF 0xc0
98 #define RX_BUFFER_SIZE 1024
100 #define MAX_TX_URBS 16 /* must be power of 2 */
103 u8 len; /* len is always the total message length in 32bit words */
116 struct version_reply_msg {
133 __le32 id; /* upper 3 bits contain flags */
142 u32 hnd; /* opaque handle, not used by device */
143 __le32 id; /* upper 3 bits contain flags */
152 u32 hnd; /* opaque handle, not used by device */
156 struct id_filter_msg {
161 __le32 mask[ESD_MAX_ID_SEGMENT + 1];
164 struct set_baudrate_msg {
172 /* Main message type used between library and application */
173 struct __attribute__ ((packed)) esd_usb2_msg {
175 struct header_msg hdr;
176 struct version_msg version;
177 struct version_reply_msg version_reply;
180 struct tx_done_msg txdone;
181 struct set_baudrate_msg setbaud;
182 struct id_filter_msg filter;
186 static struct usb_device_id esd_usb2_table[] = {
187 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
188 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)},
191 MODULE_DEVICE_TABLE(usb, esd_usb2_table);
193 struct esd_usb2_net_priv;
195 struct esd_tx_urb_context {
196 struct esd_usb2_net_priv *priv;
202 struct usb_device *udev;
203 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
205 struct usb_anchor rx_submitted;
210 void *rxbuf[MAX_RX_URBS];
211 dma_addr_t rxbuf_dma[MAX_RX_URBS];
214 struct esd_usb2_net_priv {
215 struct can_priv can; /* must be the first member */
217 atomic_t active_tx_jobs;
218 struct usb_anchor tx_submitted;
219 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
221 struct esd_usb2 *usb2;
222 struct net_device *netdev;
225 struct can_berr_counter bec;
228 static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
229 struct esd_usb2_msg *msg)
231 struct net_device_stats *stats = &priv->netdev->stats;
232 struct can_frame *cf;
234 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
236 if (id == ESD_EV_CAN_ERROR_EXT) {
237 u8 state = msg->msg.rx.data[0];
238 u8 ecc = msg->msg.rx.data[1];
239 u8 rxerr = msg->msg.rx.data[2];
240 u8 txerr = msg->msg.rx.data[3];
242 skb = alloc_can_err_skb(priv->netdev, &cf);
248 if (state != priv->old_state) {
249 priv->old_state = state;
251 switch (state & ESD_BUSSTATE_MASK) {
252 case ESD_BUSSTATE_BUSOFF:
253 priv->can.state = CAN_STATE_BUS_OFF;
254 cf->can_id |= CAN_ERR_BUSOFF;
255 priv->can.can_stats.bus_off++;
256 can_bus_off(priv->netdev);
258 case ESD_BUSSTATE_WARN:
259 priv->can.state = CAN_STATE_ERROR_WARNING;
260 priv->can.can_stats.error_warning++;
262 case ESD_BUSSTATE_ERRPASSIVE:
263 priv->can.state = CAN_STATE_ERROR_PASSIVE;
264 priv->can.can_stats.error_passive++;
267 priv->can.state = CAN_STATE_ERROR_ACTIVE;
271 priv->can.can_stats.bus_error++;
274 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
276 switch (ecc & SJA1000_ECC_MASK) {
277 case SJA1000_ECC_BIT:
278 cf->data[2] |= CAN_ERR_PROT_BIT;
280 case SJA1000_ECC_FORM:
281 cf->data[2] |= CAN_ERR_PROT_FORM;
283 case SJA1000_ECC_STUFF:
284 cf->data[2] |= CAN_ERR_PROT_STUFF;
287 cf->data[3] = ecc & SJA1000_ECC_SEG;
291 /* Error occurred during transmission? */
292 if (!(ecc & SJA1000_ECC_DIR))
293 cf->data[2] |= CAN_ERR_PROT_TX;
295 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
296 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
297 cf->data[1] = (txerr > rxerr) ?
298 CAN_ERR_CRTL_TX_PASSIVE :
299 CAN_ERR_CRTL_RX_PASSIVE;
305 priv->bec.txerr = txerr;
306 priv->bec.rxerr = rxerr;
309 stats->rx_bytes += cf->can_dlc;
314 static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
315 struct esd_usb2_msg *msg)
317 struct net_device_stats *stats = &priv->netdev->stats;
318 struct can_frame *cf;
323 if (!netif_device_present(priv->netdev))
326 id = le32_to_cpu(msg->msg.rx.id);
328 if (id & ESD_EVENT) {
329 esd_usb2_rx_event(priv, msg);
331 skb = alloc_can_skb(priv->netdev, &cf);
337 cf->can_id = id & ESD_IDMASK;
338 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR);
341 cf->can_id |= CAN_EFF_FLAG;
343 if (msg->msg.rx.dlc & ESD_RTR) {
344 cf->can_id |= CAN_RTR_FLAG;
346 for (i = 0; i < cf->can_dlc; i++)
347 cf->data[i] = msg->msg.rx.data[i];
351 stats->rx_bytes += cf->can_dlc;
358 static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
359 struct esd_usb2_msg *msg)
361 struct net_device_stats *stats = &priv->netdev->stats;
362 struct net_device *netdev = priv->netdev;
363 struct esd_tx_urb_context *context;
365 if (!netif_device_present(netdev))
368 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
370 if (!msg->msg.txdone.status) {
372 stats->tx_bytes += context->dlc;
373 can_get_echo_skb(netdev, context->echo_index);
376 can_free_echo_skb(netdev, context->echo_index);
379 /* Release context */
380 context->echo_index = MAX_TX_URBS;
381 atomic_dec(&priv->active_tx_jobs);
383 netif_wake_queue(netdev);
386 static void esd_usb2_read_bulk_callback(struct urb *urb)
388 struct esd_usb2 *dev = urb->context;
393 switch (urb->status) {
394 case 0: /* success */
404 dev_info(dev->udev->dev.parent,
405 "Rx URB aborted (%d)\n", urb->status);
409 while (pos < urb->actual_length) {
410 struct esd_usb2_msg *msg;
412 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
414 switch (msg->msg.hdr.cmd) {
416 if (msg->msg.rx.net >= dev->net_count) {
417 dev_err(dev->udev->dev.parent, "format error\n");
421 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
425 if (msg->msg.txdone.net >= dev->net_count) {
426 dev_err(dev->udev->dev.parent, "format error\n");
430 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
435 pos += msg->msg.hdr.len << 2;
437 if (pos > urb->actual_length) {
438 dev_err(dev->udev->dev.parent, "format error\n");
444 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
445 urb->transfer_buffer, RX_BUFFER_SIZE,
446 esd_usb2_read_bulk_callback, dev);
448 retval = usb_submit_urb(urb, GFP_ATOMIC);
449 if (retval == -ENODEV) {
450 for (i = 0; i < dev->net_count; i++) {
452 netif_device_detach(dev->nets[i]->netdev);
455 dev_err(dev->udev->dev.parent,
456 "failed resubmitting read bulk urb: %d\n", retval);
463 * callback for bulk IN urb
465 static void esd_usb2_write_bulk_callback(struct urb *urb)
467 struct esd_tx_urb_context *context = urb->context;
468 struct esd_usb2_net_priv *priv;
469 struct net_device *netdev;
470 size_t size = sizeof(struct esd_usb2_msg);
474 priv = context->priv;
475 netdev = priv->netdev;
477 /* free up our allocated buffer */
478 usb_free_coherent(urb->dev, size,
479 urb->transfer_buffer, urb->transfer_dma);
481 if (!netif_device_present(netdev))
485 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
487 netif_trans_update(netdev);
490 static ssize_t show_firmware(struct device *d,
491 struct device_attribute *attr, char *buf)
493 struct usb_interface *intf = to_usb_interface(d);
494 struct esd_usb2 *dev = usb_get_intfdata(intf);
496 return sprintf(buf, "%d.%d.%d\n",
497 (dev->version >> 12) & 0xf,
498 (dev->version >> 8) & 0xf,
499 dev->version & 0xff);
501 static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
503 static ssize_t show_hardware(struct device *d,
504 struct device_attribute *attr, char *buf)
506 struct usb_interface *intf = to_usb_interface(d);
507 struct esd_usb2 *dev = usb_get_intfdata(intf);
509 return sprintf(buf, "%d.%d.%d\n",
510 (dev->version >> 28) & 0xf,
511 (dev->version >> 24) & 0xf,
512 (dev->version >> 16) & 0xff);
514 static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
516 static ssize_t show_nets(struct device *d,
517 struct device_attribute *attr, char *buf)
519 struct usb_interface *intf = to_usb_interface(d);
520 struct esd_usb2 *dev = usb_get_intfdata(intf);
522 return sprintf(buf, "%d", dev->net_count);
524 static DEVICE_ATTR(nets, S_IRUGO, show_nets, NULL);
526 static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
530 return usb_bulk_msg(dev->udev,
531 usb_sndbulkpipe(dev->udev, 2),
533 msg->msg.hdr.len << 2,
538 static int esd_usb2_wait_msg(struct esd_usb2 *dev,
539 struct esd_usb2_msg *msg)
543 return usb_bulk_msg(dev->udev,
544 usb_rcvbulkpipe(dev->udev, 1),
551 static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
558 for (i = 0; i < MAX_RX_URBS; i++) {
559 struct urb *urb = NULL;
563 /* create a URB, and a buffer for it */
564 urb = usb_alloc_urb(0, GFP_KERNEL);
570 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
573 dev_warn(dev->udev->dev.parent,
574 "No memory left for USB buffer\n");
579 urb->transfer_dma = buf_dma;
581 usb_fill_bulk_urb(urb, dev->udev,
582 usb_rcvbulkpipe(dev->udev, 1),
584 esd_usb2_read_bulk_callback, dev);
585 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
586 usb_anchor_urb(urb, &dev->rx_submitted);
588 err = usb_submit_urb(urb, GFP_KERNEL);
590 usb_unanchor_urb(urb);
591 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
597 dev->rxbuf_dma[i] = buf_dma;
600 /* Drop reference, USB core will take care of freeing it */
606 /* Did we submit any URBs */
608 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
612 /* Warn if we've couldn't transmit all the URBs */
613 if (i < MAX_RX_URBS) {
614 dev_warn(dev->udev->dev.parent,
615 "rx performance may be slow\n");
625 static int esd_usb2_start(struct esd_usb2_net_priv *priv)
627 struct esd_usb2 *dev = priv->usb2;
628 struct net_device *netdev = priv->netdev;
629 struct esd_usb2_msg *msg;
632 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
640 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
641 * Each bit represents one 11 bit CAN identifier. A set bit
642 * enables reception of the corresponding CAN identifier. A cleared
643 * bit disabled this identifier. An additional bitmask value
644 * following the CAN 2.0A bits is used to enable reception of
645 * extended CAN frames. Only the LSB of this final mask is checked
646 * for the complete 29 bit ID range. The IDADD message also allows
647 * filter configuration for an ID subset. In this case you can add
648 * the number of the starting bitmask (0..64) to the filter.option
649 * field followed by only some bitmasks.
651 msg->msg.hdr.cmd = CMD_IDADD;
652 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
653 msg->msg.filter.net = priv->index;
654 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
655 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
656 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
657 /* enable 29bit extended IDs */
658 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
660 err = esd_usb2_send_msg(dev, msg);
664 err = esd_usb2_setup_rx_urbs(dev);
668 priv->can.state = CAN_STATE_ERROR_ACTIVE;
672 netif_device_detach(netdev);
674 netdev_err(netdev, "couldn't start device: %d\n", err);
680 static void unlink_all_urbs(struct esd_usb2 *dev)
682 struct esd_usb2_net_priv *priv;
685 usb_kill_anchored_urbs(&dev->rx_submitted);
687 for (i = 0; i < MAX_RX_URBS; ++i)
688 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
689 dev->rxbuf[i], dev->rxbuf_dma[i]);
691 for (i = 0; i < dev->net_count; i++) {
694 usb_kill_anchored_urbs(&priv->tx_submitted);
695 atomic_set(&priv->active_tx_jobs, 0);
697 for (j = 0; j < MAX_TX_URBS; j++)
698 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
703 static int esd_usb2_open(struct net_device *netdev)
705 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
709 err = open_candev(netdev);
713 /* finally start device */
714 err = esd_usb2_start(priv);
716 netdev_warn(netdev, "couldn't start device: %d\n", err);
717 close_candev(netdev);
721 netif_start_queue(netdev);
726 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
727 struct net_device *netdev)
729 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
730 struct esd_usb2 *dev = priv->usb2;
731 struct esd_tx_urb_context *context = NULL;
732 struct net_device_stats *stats = &netdev->stats;
733 struct can_frame *cf = (struct can_frame *)skb->data;
734 struct esd_usb2_msg *msg;
738 int ret = NETDEV_TX_OK;
739 size_t size = sizeof(struct esd_usb2_msg);
741 if (can_dropped_invalid_skb(netdev, skb))
744 /* create a URB, and a buffer for it, and copy the data to the URB */
745 urb = usb_alloc_urb(0, GFP_ATOMIC);
752 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
755 netdev_err(netdev, "No memory left for USB buffer\n");
761 msg = (struct esd_usb2_msg *)buf;
763 msg->msg.hdr.len = 3; /* minimal length */
764 msg->msg.hdr.cmd = CMD_CAN_TX;
765 msg->msg.tx.net = priv->index;
766 msg->msg.tx.dlc = cf->can_dlc;
767 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
769 if (cf->can_id & CAN_RTR_FLAG)
770 msg->msg.tx.dlc |= ESD_RTR;
772 if (cf->can_id & CAN_EFF_FLAG)
773 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
775 for (i = 0; i < cf->can_dlc; i++)
776 msg->msg.tx.data[i] = cf->data[i];
778 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
780 for (i = 0; i < MAX_TX_URBS; i++) {
781 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
782 context = &priv->tx_contexts[i];
788 * This may never happen.
791 netdev_warn(netdev, "couldn't find free context\n");
792 ret = NETDEV_TX_BUSY;
796 context->priv = priv;
797 context->echo_index = i;
798 context->dlc = cf->can_dlc;
800 /* hnd must not be 0 - MSB is stripped in txdone handling */
801 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
803 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
804 msg->msg.hdr.len << 2,
805 esd_usb2_write_bulk_callback, context);
807 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
809 usb_anchor_urb(urb, &priv->tx_submitted);
811 can_put_echo_skb(skb, netdev, context->echo_index);
813 atomic_inc(&priv->active_tx_jobs);
815 /* Slow down tx path */
816 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
817 netif_stop_queue(netdev);
819 err = usb_submit_urb(urb, GFP_ATOMIC);
821 can_free_echo_skb(netdev, context->echo_index);
823 atomic_dec(&priv->active_tx_jobs);
824 usb_unanchor_urb(urb);
829 netif_device_detach(netdev);
831 netdev_warn(netdev, "failed tx_urb %d\n", err);
836 netif_trans_update(netdev);
839 * Release our reference to this URB, the USB core will eventually free
847 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
856 static int esd_usb2_close(struct net_device *netdev)
858 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
859 struct esd_usb2_msg *msg;
862 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
866 /* Disable all IDs (see esd_usb2_start()) */
867 msg->msg.hdr.cmd = CMD_IDADD;
868 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
869 msg->msg.filter.net = priv->index;
870 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
871 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
872 msg->msg.filter.mask[i] = 0;
873 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
874 netdev_err(netdev, "sending idadd message failed\n");
876 /* set CAN controller to reset mode */
877 msg->msg.hdr.len = 2;
878 msg->msg.hdr.cmd = CMD_SETBAUD;
879 msg->msg.setbaud.net = priv->index;
880 msg->msg.setbaud.rsvd = 0;
881 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
882 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
883 netdev_err(netdev, "sending setbaud message failed\n");
885 priv->can.state = CAN_STATE_STOPPED;
887 netif_stop_queue(netdev);
889 close_candev(netdev);
896 static const struct net_device_ops esd_usb2_netdev_ops = {
897 .ndo_open = esd_usb2_open,
898 .ndo_stop = esd_usb2_close,
899 .ndo_start_xmit = esd_usb2_start_xmit,
900 .ndo_change_mtu = can_change_mtu,
903 static const struct can_bittiming_const esd_usb2_bittiming_const = {
905 .tseg1_min = ESD_USB2_TSEG1_MIN,
906 .tseg1_max = ESD_USB2_TSEG1_MAX,
907 .tseg2_min = ESD_USB2_TSEG2_MIN,
908 .tseg2_max = ESD_USB2_TSEG2_MAX,
909 .sjw_max = ESD_USB2_SJW_MAX,
910 .brp_min = ESD_USB2_BRP_MIN,
911 .brp_max = ESD_USB2_BRP_MAX,
912 .brp_inc = ESD_USB2_BRP_INC,
915 static int esd_usb2_set_bittiming(struct net_device *netdev)
917 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
918 struct can_bittiming *bt = &priv->can.bittiming;
919 struct esd_usb2_msg *msg;
924 canbtr = ESD_USB2_UBR;
925 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
926 canbtr |= ESD_USB2_LOM;
928 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
930 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
931 USB_CANUSBM_PRODUCT_ID)
932 sjw_shift = ESD_USBM_SJW_SHIFT;
934 sjw_shift = ESD_USB2_SJW_SHIFT;
936 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
938 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
939 & (ESD_USB2_TSEG1_MAX - 1))
940 << ESD_USB2_TSEG1_SHIFT;
941 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
942 << ESD_USB2_TSEG2_SHIFT;
943 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
944 canbtr |= ESD_USB2_3_SAMPLES;
946 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
950 msg->msg.hdr.len = 2;
951 msg->msg.hdr.cmd = CMD_SETBAUD;
952 msg->msg.setbaud.net = priv->index;
953 msg->msg.setbaud.rsvd = 0;
954 msg->msg.setbaud.baud = cpu_to_le32(canbtr);
956 netdev_info(netdev, "setting BTR=%#x\n", canbtr);
958 err = esd_usb2_send_msg(priv->usb2, msg);
964 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
965 struct can_berr_counter *bec)
967 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
969 bec->txerr = priv->bec.txerr;
970 bec->rxerr = priv->bec.rxerr;
975 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
979 netif_wake_queue(netdev);
989 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
991 struct esd_usb2 *dev = usb_get_intfdata(intf);
992 struct net_device *netdev;
993 struct esd_usb2_net_priv *priv;
997 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
999 dev_err(&intf->dev, "couldn't alloc candev\n");
1004 priv = netdev_priv(netdev);
1006 init_usb_anchor(&priv->tx_submitted);
1007 atomic_set(&priv->active_tx_jobs, 0);
1009 for (i = 0; i < MAX_TX_URBS; i++)
1010 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1013 priv->netdev = netdev;
1014 priv->index = index;
1016 priv->can.state = CAN_STATE_STOPPED;
1017 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1019 if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1020 USB_CANUSBM_PRODUCT_ID)
1021 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1023 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1024 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1027 priv->can.bittiming_const = &esd_usb2_bittiming_const;
1028 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1029 priv->can.do_set_mode = esd_usb2_set_mode;
1030 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1032 netdev->flags |= IFF_ECHO; /* we support local echo */
1034 netdev->netdev_ops = &esd_usb2_netdev_ops;
1036 SET_NETDEV_DEV(netdev, &intf->dev);
1037 netdev->dev_id = index;
1039 err = register_candev(netdev);
1041 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1042 free_candev(netdev);
1047 dev->nets[index] = priv;
1048 netdev_info(netdev, "device %s registered\n", netdev->name);
1055 * probe function for new USB2 devices
1057 * check version information and number of available
1060 static int esd_usb2_probe(struct usb_interface *intf,
1061 const struct usb_device_id *id)
1063 struct esd_usb2 *dev;
1064 struct esd_usb2_msg *msg;
1067 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1073 dev->udev = interface_to_usbdev(intf);
1075 init_usb_anchor(&dev->rx_submitted);
1077 usb_set_intfdata(intf, dev);
1079 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1085 /* query number of CAN interfaces (nets) */
1086 msg->msg.hdr.cmd = CMD_VERSION;
1087 msg->msg.hdr.len = 2;
1088 msg->msg.version.rsvd = 0;
1089 msg->msg.version.flags = 0;
1090 msg->msg.version.drv_version = 0;
1092 err = esd_usb2_send_msg(dev, msg);
1094 dev_err(&intf->dev, "sending version message failed\n");
1098 err = esd_usb2_wait_msg(dev, msg);
1100 dev_err(&intf->dev, "no version message answer\n");
1104 dev->net_count = (int)msg->msg.version_reply.nets;
1105 dev->version = le32_to_cpu(msg->msg.version_reply.version);
1107 if (device_create_file(&intf->dev, &dev_attr_firmware))
1109 "Couldn't create device file for firmware\n");
1111 if (device_create_file(&intf->dev, &dev_attr_hardware))
1113 "Couldn't create device file for hardware\n");
1115 if (device_create_file(&intf->dev, &dev_attr_nets))
1117 "Couldn't create device file for nets\n");
1119 /* do per device probing */
1120 for (i = 0; i < dev->net_count; i++)
1121 esd_usb2_probe_one_net(intf, i);
1132 * called by the usb core when the device is removed from the system
1134 static void esd_usb2_disconnect(struct usb_interface *intf)
1136 struct esd_usb2 *dev = usb_get_intfdata(intf);
1137 struct net_device *netdev;
1140 device_remove_file(&intf->dev, &dev_attr_firmware);
1141 device_remove_file(&intf->dev, &dev_attr_hardware);
1142 device_remove_file(&intf->dev, &dev_attr_nets);
1144 usb_set_intfdata(intf, NULL);
1147 for (i = 0; i < dev->net_count; i++) {
1149 netdev = dev->nets[i]->netdev;
1150 unregister_netdev(netdev);
1151 free_candev(netdev);
1154 unlink_all_urbs(dev);
1159 /* usb specific object needed to register this driver with the usb subsystem */
1160 static struct usb_driver esd_usb2_driver = {
1162 .probe = esd_usb2_probe,
1163 .disconnect = esd_usb2_disconnect,
1164 .id_table = esd_usb2_table,
1167 module_usb_driver(esd_usb2_driver);