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/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 and CAN-USB/Micro 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
37 #define USB_CANUSBM_PRODUCT_ID 0x0011
39 #define ESD_USB2_CAN_CLOCK 60000000
40 #define ESD_USBM_CAN_CLOCK 36000000
41 #define ESD_USB2_MAX_NETS 2
44 #define CMD_VERSION 1 /* also used for VERSION_REPLY */
45 #define CMD_CAN_RX 2 /* device to host only */
46 #define CMD_CAN_TX 3 /* also used for TX_DONE */
47 #define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */
48 #define CMD_TS 5 /* also used for TS_REPLY */
49 #define CMD_IDADD 6 /* also used for IDADD_REPLY */
51 /* esd CAN message flags - dlc field */
54 /* esd CAN message flags - id field */
55 #define ESD_EXTID 0x20000000
56 #define ESD_EVENT 0x40000000
57 #define ESD_IDMASK 0x1fffffff
59 /* esd CAN event ids used by this driver */
60 #define ESD_EV_CAN_ERROR_EXT 2
62 /* baudrate message flags */
63 #define ESD_USB2_UBR 0x80000000
64 #define ESD_USB2_LOM 0x40000000
65 #define ESD_USB2_NO_BAUDRATE 0x7fffffff
66 #define ESD_USB2_TSEG1_MIN 1
67 #define ESD_USB2_TSEG1_MAX 16
68 #define ESD_USB2_TSEG1_SHIFT 16
69 #define ESD_USB2_TSEG2_MIN 1
70 #define ESD_USB2_TSEG2_MAX 8
71 #define ESD_USB2_TSEG2_SHIFT 20
72 #define ESD_USB2_SJW_MAX 4
73 #define ESD_USB2_SJW_SHIFT 14
74 #define ESD_USBM_SJW_SHIFT 24
75 #define ESD_USB2_BRP_MIN 1
76 #define ESD_USB2_BRP_MAX 1024
77 #define ESD_USB2_BRP_INC 1
78 #define ESD_USB2_3_SAMPLES 0x00800000
80 /* esd IDADD message */
81 #define ESD_ID_ENABLE 0x80
82 #define ESD_MAX_ID_SEGMENT 64
84 /* SJA1000 ECC register (emulated by usb2 firmware) */
85 #define SJA1000_ECC_SEG 0x1F
86 #define SJA1000_ECC_DIR 0x20
87 #define SJA1000_ECC_ERR 0x06
88 #define SJA1000_ECC_BIT 0x00
89 #define SJA1000_ECC_FORM 0x40
90 #define SJA1000_ECC_STUFF 0x80
91 #define SJA1000_ECC_MASK 0xc0
93 /* esd bus state event codes */
94 #define ESD_BUSSTATE_MASK 0xc0
95 #define ESD_BUSSTATE_WARN 0x40
96 #define ESD_BUSSTATE_ERRPASSIVE 0x80
97 #define ESD_BUSSTATE_BUSOFF 0xc0
99 #define RX_BUFFER_SIZE 1024
100 #define MAX_RX_URBS 4
101 #define MAX_TX_URBS 16 /* must be power of 2 */
104 u8 len; /* len is always the total message length in 32bit words */
117 struct version_reply_msg {
134 __le32 id; /* upper 3 bits contain flags */
144 __le32 id; /* upper 3 bits contain flags */
157 struct id_filter_msg {
162 __le32 mask[ESD_MAX_ID_SEGMENT + 1];
165 struct set_baudrate_msg {
173 /* Main message type used between library and application */
174 struct __attribute__ ((packed)) esd_usb2_msg {
176 struct header_msg hdr;
177 struct version_msg version;
178 struct version_reply_msg version_reply;
181 struct tx_done_msg txdone;
182 struct set_baudrate_msg setbaud;
183 struct id_filter_msg filter;
187 static struct usb_device_id esd_usb2_table[] = {
188 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)},
189 {USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)},
192 MODULE_DEVICE_TABLE(usb, esd_usb2_table);
194 struct esd_usb2_net_priv;
196 struct esd_tx_urb_context {
197 struct esd_usb2_net_priv *priv;
203 struct usb_device *udev;
204 struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS];
206 struct usb_anchor rx_submitted;
213 struct esd_usb2_net_priv {
214 struct can_priv can; /* must be the first member */
216 atomic_t active_tx_jobs;
217 struct usb_anchor tx_submitted;
218 struct esd_tx_urb_context tx_contexts[MAX_TX_URBS];
220 struct esd_usb2 *usb2;
221 struct net_device *netdev;
224 struct can_berr_counter bec;
227 static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv,
228 struct esd_usb2_msg *msg)
230 struct net_device_stats *stats = &priv->netdev->stats;
231 struct can_frame *cf;
233 u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK;
235 if (id == ESD_EV_CAN_ERROR_EXT) {
236 u8 state = msg->msg.rx.data[0];
237 u8 ecc = msg->msg.rx.data[1];
238 u8 txerr = msg->msg.rx.data[2];
239 u8 rxerr = msg->msg.rx.data[3];
241 skb = alloc_can_err_skb(priv->netdev, &cf);
247 if (state != priv->old_state) {
248 priv->old_state = state;
250 switch (state & ESD_BUSSTATE_MASK) {
251 case ESD_BUSSTATE_BUSOFF:
252 priv->can.state = CAN_STATE_BUS_OFF;
253 cf->can_id |= CAN_ERR_BUSOFF;
254 can_bus_off(priv->netdev);
256 case ESD_BUSSTATE_WARN:
257 priv->can.state = CAN_STATE_ERROR_WARNING;
258 priv->can.can_stats.error_warning++;
260 case ESD_BUSSTATE_ERRPASSIVE:
261 priv->can.state = CAN_STATE_ERROR_PASSIVE;
262 priv->can.can_stats.error_passive++;
265 priv->can.state = CAN_STATE_ERROR_ACTIVE;
269 priv->can.can_stats.bus_error++;
272 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
274 switch (ecc & SJA1000_ECC_MASK) {
275 case SJA1000_ECC_BIT:
276 cf->data[2] |= CAN_ERR_PROT_BIT;
278 case SJA1000_ECC_FORM:
279 cf->data[2] |= CAN_ERR_PROT_FORM;
281 case SJA1000_ECC_STUFF:
282 cf->data[2] |= CAN_ERR_PROT_STUFF;
285 cf->data[2] |= CAN_ERR_PROT_UNSPEC;
286 cf->data[3] = ecc & SJA1000_ECC_SEG;
290 /* Error occurred during transmission? */
291 if (!(ecc & SJA1000_ECC_DIR))
292 cf->data[2] |= CAN_ERR_PROT_TX;
294 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
295 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
296 cf->data[1] = (txerr > rxerr) ?
297 CAN_ERR_CRTL_TX_PASSIVE :
298 CAN_ERR_CRTL_RX_PASSIVE;
306 priv->bec.txerr = txerr;
307 priv->bec.rxerr = rxerr;
310 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);
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];
353 stats->rx_bytes += cf->can_dlc;
359 static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
360 struct esd_usb2_msg *msg)
362 struct net_device_stats *stats = &priv->netdev->stats;
363 struct net_device *netdev = priv->netdev;
364 struct esd_tx_urb_context *context;
366 if (!netif_device_present(netdev))
369 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
371 if (!msg->msg.txdone.status) {
373 stats->tx_bytes += context->dlc;
374 can_get_echo_skb(netdev, context->echo_index);
377 can_free_echo_skb(netdev, context->echo_index);
380 /* Release context */
381 context->echo_index = MAX_TX_URBS;
382 atomic_dec(&priv->active_tx_jobs);
384 netif_wake_queue(netdev);
387 static void esd_usb2_read_bulk_callback(struct urb *urb)
389 struct esd_usb2 *dev = urb->context;
394 switch (urb->status) {
395 case 0: /* success */
403 dev_info(dev->udev->dev.parent,
404 "Rx URB aborted (%d)\n", urb->status);
408 while (pos < urb->actual_length) {
409 struct esd_usb2_msg *msg;
411 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
413 switch (msg->msg.hdr.cmd) {
415 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
419 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
424 pos += msg->msg.hdr.len << 2;
426 if (pos > urb->actual_length) {
427 dev_err(dev->udev->dev.parent, "format error\n");
433 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
434 urb->transfer_buffer, RX_BUFFER_SIZE,
435 esd_usb2_read_bulk_callback, dev);
437 retval = usb_submit_urb(urb, GFP_ATOMIC);
438 if (retval == -ENODEV) {
439 for (i = 0; i < dev->net_count; i++) {
441 netif_device_detach(dev->nets[i]->netdev);
444 dev_err(dev->udev->dev.parent,
445 "failed resubmitting read bulk urb: %d\n", retval);
452 * callback for bulk IN urb
454 static void esd_usb2_write_bulk_callback(struct urb *urb)
456 struct esd_tx_urb_context *context = urb->context;
457 struct esd_usb2_net_priv *priv;
458 struct esd_usb2 *dev;
459 struct net_device *netdev;
460 size_t size = sizeof(struct esd_usb2_msg);
464 priv = context->priv;
465 netdev = priv->netdev;
468 /* free up our allocated buffer */
469 usb_free_coherent(urb->dev, size,
470 urb->transfer_buffer, urb->transfer_dma);
472 if (!netif_device_present(netdev))
476 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
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;
618 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
626 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
627 * Each bit represents one 11 bit CAN identifier. A set bit
628 * enables reception of the corresponding CAN identifier. A cleared
629 * bit disabled this identifier. An additional bitmask value
630 * following the CAN 2.0A bits is used to enable reception of
631 * extended CAN frames. Only the LSB of this final mask is checked
632 * for the complete 29 bit ID range. The IDADD message also allows
633 * filter configuration for an ID subset. In this case you can add
634 * the number of the starting bitmask (0..64) to the filter.option
635 * field followed by only some bitmasks.
637 msg->msg.hdr.cmd = CMD_IDADD;
638 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
639 msg->msg.filter.net = priv->index;
640 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
641 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
642 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
643 /* enable 29bit extended IDs */
644 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
646 err = esd_usb2_send_msg(dev, msg);
650 err = esd_usb2_setup_rx_urbs(dev);
654 priv->can.state = CAN_STATE_ERROR_ACTIVE;
658 netif_device_detach(netdev);
660 netdev_err(netdev, "couldn't start device: %d\n", err);
666 static void unlink_all_urbs(struct esd_usb2 *dev)
668 struct esd_usb2_net_priv *priv;
671 usb_kill_anchored_urbs(&dev->rx_submitted);
672 for (i = 0; i < dev->net_count; i++) {
675 usb_kill_anchored_urbs(&priv->tx_submitted);
676 atomic_set(&priv->active_tx_jobs, 0);
678 for (j = 0; j < MAX_TX_URBS; j++)
679 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
684 static int esd_usb2_open(struct net_device *netdev)
686 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
690 err = open_candev(netdev);
694 /* finally start device */
695 err = esd_usb2_start(priv);
697 netdev_warn(netdev, "couldn't start device: %d\n", err);
698 close_candev(netdev);
702 netif_start_queue(netdev);
707 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
708 struct net_device *netdev)
710 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
711 struct esd_usb2 *dev = priv->usb2;
712 struct esd_tx_urb_context *context = NULL;
713 struct net_device_stats *stats = &netdev->stats;
714 struct can_frame *cf = (struct can_frame *)skb->data;
715 struct esd_usb2_msg *msg;
719 int ret = NETDEV_TX_OK;
720 size_t size = sizeof(struct esd_usb2_msg);
722 if (can_dropped_invalid_skb(netdev, skb))
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 netdev_err(netdev, "No memory left for URBs\n");
734 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
737 netdev_err(netdev, "No memory left for USB buffer\n");
743 msg = (struct esd_usb2_msg *)buf;
745 msg->msg.hdr.len = 3; /* minimal length */
746 msg->msg.hdr.cmd = CMD_CAN_TX;
747 msg->msg.tx.net = priv->index;
748 msg->msg.tx.dlc = cf->can_dlc;
749 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
751 if (cf->can_id & CAN_RTR_FLAG)
752 msg->msg.tx.dlc |= ESD_RTR;
754 if (cf->can_id & CAN_EFF_FLAG)
755 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
757 for (i = 0; i < cf->can_dlc; i++)
758 msg->msg.tx.data[i] = cf->data[i];
760 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
762 for (i = 0; i < MAX_TX_URBS; i++) {
763 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
764 context = &priv->tx_contexts[i];
770 * This may never happen.
773 netdev_warn(netdev, "couldn't find free context\n");
774 ret = NETDEV_TX_BUSY;
778 context->priv = priv;
779 context->echo_index = i;
780 context->dlc = cf->can_dlc;
782 /* hnd must not be 0 - MSB is stripped in txdone handling */
783 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
785 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
786 msg->msg.hdr.len << 2,
787 esd_usb2_write_bulk_callback, context);
789 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
791 usb_anchor_urb(urb, &priv->tx_submitted);
793 can_put_echo_skb(skb, netdev, context->echo_index);
795 atomic_inc(&priv->active_tx_jobs);
797 /* Slow down tx path */
798 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
799 netif_stop_queue(netdev);
801 err = usb_submit_urb(urb, GFP_ATOMIC);
803 can_free_echo_skb(netdev, context->echo_index);
805 atomic_dec(&priv->active_tx_jobs);
806 usb_unanchor_urb(urb);
811 netif_device_detach(netdev);
813 netdev_warn(netdev, "failed tx_urb %d\n", err);
818 netdev->trans_start = jiffies;
821 * Release our reference to this URB, the USB core will eventually free
829 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
838 static int esd_usb2_close(struct net_device *netdev)
840 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
841 struct esd_usb2_msg *msg;
844 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
848 /* Disable all IDs (see esd_usb2_start()) */
849 msg->msg.hdr.cmd = CMD_IDADD;
850 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
851 msg->msg.filter.net = priv->index;
852 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
853 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
854 msg->msg.filter.mask[i] = 0;
855 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
856 netdev_err(netdev, "sending idadd message failed\n");
858 /* set CAN controller to reset mode */
859 msg->msg.hdr.len = 2;
860 msg->msg.hdr.cmd = CMD_SETBAUD;
861 msg->msg.setbaud.net = priv->index;
862 msg->msg.setbaud.rsvd = 0;
863 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
864 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
865 netdev_err(netdev, "sending setbaud message failed\n");
867 priv->can.state = CAN_STATE_STOPPED;
869 netif_stop_queue(netdev);
871 close_candev(netdev);
878 static const struct net_device_ops esd_usb2_netdev_ops = {
879 .ndo_open = esd_usb2_open,
880 .ndo_stop = esd_usb2_close,
881 .ndo_start_xmit = esd_usb2_start_xmit,
884 static const struct can_bittiming_const esd_usb2_bittiming_const = {
886 .tseg1_min = ESD_USB2_TSEG1_MIN,
887 .tseg1_max = ESD_USB2_TSEG1_MAX,
888 .tseg2_min = ESD_USB2_TSEG2_MIN,
889 .tseg2_max = ESD_USB2_TSEG2_MAX,
890 .sjw_max = ESD_USB2_SJW_MAX,
891 .brp_min = ESD_USB2_BRP_MIN,
892 .brp_max = ESD_USB2_BRP_MAX,
893 .brp_inc = ESD_USB2_BRP_INC,
896 static int esd_usb2_set_bittiming(struct net_device *netdev)
898 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
899 struct can_bittiming *bt = &priv->can.bittiming;
900 struct esd_usb2_msg *msg;
905 canbtr = ESD_USB2_UBR;
906 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
907 canbtr |= ESD_USB2_LOM;
909 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
911 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
912 USB_CANUSBM_PRODUCT_ID)
913 sjw_shift = ESD_USBM_SJW_SHIFT;
915 sjw_shift = ESD_USB2_SJW_SHIFT;
917 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
919 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
920 & (ESD_USB2_TSEG1_MAX - 1))
921 << ESD_USB2_TSEG1_SHIFT;
922 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
923 << ESD_USB2_TSEG2_SHIFT;
924 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
925 canbtr |= ESD_USB2_3_SAMPLES;
927 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
931 msg->msg.hdr.len = 2;
932 msg->msg.hdr.cmd = CMD_SETBAUD;
933 msg->msg.setbaud.net = priv->index;
934 msg->msg.setbaud.rsvd = 0;
935 msg->msg.setbaud.baud = cpu_to_le32(canbtr);
937 netdev_info(netdev, "setting BTR=%#x\n", canbtr);
939 err = esd_usb2_send_msg(priv->usb2, msg);
945 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
946 struct can_berr_counter *bec)
948 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
950 bec->txerr = priv->bec.txerr;
951 bec->rxerr = priv->bec.rxerr;
956 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
960 netif_wake_queue(netdev);
970 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
972 struct esd_usb2 *dev = usb_get_intfdata(intf);
973 struct net_device *netdev;
974 struct esd_usb2_net_priv *priv;
978 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
980 dev_err(&intf->dev, "couldn't alloc candev\n");
985 priv = netdev_priv(netdev);
987 init_usb_anchor(&priv->tx_submitted);
988 atomic_set(&priv->active_tx_jobs, 0);
990 for (i = 0; i < MAX_TX_URBS; i++)
991 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
994 priv->netdev = netdev;
997 priv->can.state = CAN_STATE_STOPPED;
998 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1000 if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1001 USB_CANUSBM_PRODUCT_ID)
1002 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1004 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1005 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1008 priv->can.bittiming_const = &esd_usb2_bittiming_const;
1009 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1010 priv->can.do_set_mode = esd_usb2_set_mode;
1011 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1013 netdev->flags |= IFF_ECHO; /* we support local echo */
1015 netdev->netdev_ops = &esd_usb2_netdev_ops;
1017 SET_NETDEV_DEV(netdev, &intf->dev);
1019 err = register_candev(netdev);
1021 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1022 free_candev(netdev);
1027 dev->nets[index] = priv;
1028 netdev_info(netdev, "device %s registered\n", netdev->name);
1035 * probe function for new USB2 devices
1037 * check version information and number of available
1040 static int esd_usb2_probe(struct usb_interface *intf,
1041 const struct usb_device_id *id)
1043 struct esd_usb2 *dev;
1044 struct esd_usb2_msg *msg;
1047 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1053 dev->udev = interface_to_usbdev(intf);
1055 init_usb_anchor(&dev->rx_submitted);
1057 usb_set_intfdata(intf, dev);
1059 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1065 /* query number of CAN interfaces (nets) */
1066 msg->msg.hdr.cmd = CMD_VERSION;
1067 msg->msg.hdr.len = 2;
1068 msg->msg.version.rsvd = 0;
1069 msg->msg.version.flags = 0;
1070 msg->msg.version.drv_version = 0;
1072 err = esd_usb2_send_msg(dev, msg);
1074 dev_err(&intf->dev, "sending version message failed\n");
1078 err = esd_usb2_wait_msg(dev, msg);
1080 dev_err(&intf->dev, "no version message answer\n");
1084 dev->net_count = (int)msg->msg.version_reply.nets;
1085 dev->version = le32_to_cpu(msg->msg.version_reply.version);
1087 if (device_create_file(&intf->dev, &dev_attr_firmware))
1089 "Couldn't create device file for firmware\n");
1091 if (device_create_file(&intf->dev, &dev_attr_hardware))
1093 "Couldn't create device file for hardware\n");
1095 if (device_create_file(&intf->dev, &dev_attr_nets))
1097 "Couldn't create device file for nets\n");
1099 /* do per device probing */
1100 for (i = 0; i < dev->net_count; i++)
1101 esd_usb2_probe_one_net(intf, i);
1112 * called by the usb core when the device is removed from the system
1114 static void esd_usb2_disconnect(struct usb_interface *intf)
1116 struct esd_usb2 *dev = usb_get_intfdata(intf);
1117 struct net_device *netdev;
1120 device_remove_file(&intf->dev, &dev_attr_firmware);
1121 device_remove_file(&intf->dev, &dev_attr_hardware);
1122 device_remove_file(&intf->dev, &dev_attr_nets);
1124 usb_set_intfdata(intf, NULL);
1127 for (i = 0; i < dev->net_count; i++) {
1129 netdev = dev->nets[i]->netdev;
1130 unregister_netdev(netdev);
1131 free_candev(netdev);
1134 unlink_all_urbs(dev);
1138 /* usb specific object needed to register this driver with the usb subsystem */
1139 static struct usb_driver esd_usb2_driver = {
1141 .probe = esd_usb2_probe,
1142 .disconnect = esd_usb2_disconnect,
1143 .id_table = esd_usb2_table,
1146 module_usb_driver(esd_usb2_driver);