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 netdev_dbg(priv->netdev,
243 "CAN_ERR_EV_EXT: dlc=%#02x state=%02x ecc=%02x rec=%02x tec=%02x\n",
244 msg->msg.rx.dlc, state, ecc, rxerr, txerr);
246 skb = alloc_can_err_skb(priv->netdev, &cf);
252 if (state != priv->old_state) {
253 priv->old_state = state;
255 switch (state & ESD_BUSSTATE_MASK) {
256 case ESD_BUSSTATE_BUSOFF:
257 priv->can.state = CAN_STATE_BUS_OFF;
258 cf->can_id |= CAN_ERR_BUSOFF;
259 priv->can.can_stats.bus_off++;
260 can_bus_off(priv->netdev);
262 case ESD_BUSSTATE_WARN:
263 priv->can.state = CAN_STATE_ERROR_WARNING;
264 priv->can.can_stats.error_warning++;
266 case ESD_BUSSTATE_ERRPASSIVE:
267 priv->can.state = CAN_STATE_ERROR_PASSIVE;
268 priv->can.can_stats.error_passive++;
271 priv->can.state = CAN_STATE_ERROR_ACTIVE;
277 priv->can.can_stats.bus_error++;
280 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
282 switch (ecc & SJA1000_ECC_MASK) {
283 case SJA1000_ECC_BIT:
284 cf->data[2] |= CAN_ERR_PROT_BIT;
286 case SJA1000_ECC_FORM:
287 cf->data[2] |= CAN_ERR_PROT_FORM;
289 case SJA1000_ECC_STUFF:
290 cf->data[2] |= CAN_ERR_PROT_STUFF;
296 /* Error occurred during transmission? */
297 if (!(ecc & SJA1000_ECC_DIR))
298 cf->data[2] |= CAN_ERR_PROT_TX;
300 /* Bit stream position in CAN frame as the error was detected */
301 cf->data[3] = ecc & SJA1000_ECC_SEG;
303 if (priv->can.state == CAN_STATE_ERROR_WARNING ||
304 priv->can.state == CAN_STATE_ERROR_PASSIVE) {
305 cf->data[1] = (txerr > rxerr) ?
306 CAN_ERR_CRTL_TX_PASSIVE :
307 CAN_ERR_CRTL_RX_PASSIVE;
313 priv->bec.txerr = txerr;
314 priv->bec.rxerr = rxerr;
317 stats->rx_bytes += cf->can_dlc;
322 static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv,
323 struct esd_usb2_msg *msg)
325 struct net_device_stats *stats = &priv->netdev->stats;
326 struct can_frame *cf;
331 if (!netif_device_present(priv->netdev))
334 id = le32_to_cpu(msg->msg.rx.id);
336 if (id & ESD_EVENT) {
337 esd_usb2_rx_event(priv, msg);
339 skb = alloc_can_skb(priv->netdev, &cf);
345 cf->can_id = id & ESD_IDMASK;
346 cf->can_dlc = get_can_dlc(msg->msg.rx.dlc & ~ESD_RTR);
349 cf->can_id |= CAN_EFF_FLAG;
351 if (msg->msg.rx.dlc & ESD_RTR) {
352 cf->can_id |= CAN_RTR_FLAG;
354 for (i = 0; i < cf->can_dlc; i++)
355 cf->data[i] = msg->msg.rx.data[i];
359 stats->rx_bytes += cf->can_dlc;
366 static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv,
367 struct esd_usb2_msg *msg)
369 struct net_device_stats *stats = &priv->netdev->stats;
370 struct net_device *netdev = priv->netdev;
371 struct esd_tx_urb_context *context;
373 if (!netif_device_present(netdev))
376 context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)];
378 if (!msg->msg.txdone.status) {
380 stats->tx_bytes += context->dlc;
381 can_get_echo_skb(netdev, context->echo_index);
384 can_free_echo_skb(netdev, context->echo_index);
387 /* Release context */
388 context->echo_index = MAX_TX_URBS;
389 atomic_dec(&priv->active_tx_jobs);
391 netif_wake_queue(netdev);
394 static void esd_usb2_read_bulk_callback(struct urb *urb)
396 struct esd_usb2 *dev = urb->context;
401 switch (urb->status) {
402 case 0: /* success */
412 dev_info(dev->udev->dev.parent,
413 "Rx URB aborted (%d)\n", urb->status);
417 while (pos < urb->actual_length) {
418 struct esd_usb2_msg *msg;
420 msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
422 switch (msg->msg.hdr.cmd) {
424 if (msg->msg.rx.net >= dev->net_count) {
425 dev_err(dev->udev->dev.parent, "format error\n");
429 esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
433 if (msg->msg.txdone.net >= dev->net_count) {
434 dev_err(dev->udev->dev.parent, "format error\n");
438 esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
443 pos += msg->msg.hdr.len << 2;
445 if (pos > urb->actual_length) {
446 dev_err(dev->udev->dev.parent, "format error\n");
452 usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
453 urb->transfer_buffer, RX_BUFFER_SIZE,
454 esd_usb2_read_bulk_callback, dev);
456 retval = usb_submit_urb(urb, GFP_ATOMIC);
457 if (retval == -ENODEV) {
458 for (i = 0; i < dev->net_count; i++) {
460 netif_device_detach(dev->nets[i]->netdev);
463 dev_err(dev->udev->dev.parent,
464 "failed resubmitting read bulk urb: %d\n", retval);
471 * callback for bulk IN urb
473 static void esd_usb2_write_bulk_callback(struct urb *urb)
475 struct esd_tx_urb_context *context = urb->context;
476 struct esd_usb2_net_priv *priv;
477 struct net_device *netdev;
478 size_t size = sizeof(struct esd_usb2_msg);
482 priv = context->priv;
483 netdev = priv->netdev;
485 /* free up our allocated buffer */
486 usb_free_coherent(urb->dev, size,
487 urb->transfer_buffer, urb->transfer_dma);
489 if (!netif_device_present(netdev))
493 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
495 netif_trans_update(netdev);
498 static ssize_t show_firmware(struct device *d,
499 struct device_attribute *attr, char *buf)
501 struct usb_interface *intf = to_usb_interface(d);
502 struct esd_usb2 *dev = usb_get_intfdata(intf);
504 return sprintf(buf, "%d.%d.%d\n",
505 (dev->version >> 12) & 0xf,
506 (dev->version >> 8) & 0xf,
507 dev->version & 0xff);
509 static DEVICE_ATTR(firmware, 0444, show_firmware, NULL);
511 static ssize_t show_hardware(struct device *d,
512 struct device_attribute *attr, char *buf)
514 struct usb_interface *intf = to_usb_interface(d);
515 struct esd_usb2 *dev = usb_get_intfdata(intf);
517 return sprintf(buf, "%d.%d.%d\n",
518 (dev->version >> 28) & 0xf,
519 (dev->version >> 24) & 0xf,
520 (dev->version >> 16) & 0xff);
522 static DEVICE_ATTR(hardware, 0444, show_hardware, NULL);
524 static ssize_t show_nets(struct device *d,
525 struct device_attribute *attr, char *buf)
527 struct usb_interface *intf = to_usb_interface(d);
528 struct esd_usb2 *dev = usb_get_intfdata(intf);
530 return sprintf(buf, "%d", dev->net_count);
532 static DEVICE_ATTR(nets, 0444, show_nets, NULL);
534 static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg)
538 return usb_bulk_msg(dev->udev,
539 usb_sndbulkpipe(dev->udev, 2),
541 msg->msg.hdr.len << 2,
546 static int esd_usb2_wait_msg(struct esd_usb2 *dev,
547 struct esd_usb2_msg *msg)
551 return usb_bulk_msg(dev->udev,
552 usb_rcvbulkpipe(dev->udev, 1),
559 static int esd_usb2_setup_rx_urbs(struct esd_usb2 *dev)
566 for (i = 0; i < MAX_RX_URBS; i++) {
567 struct urb *urb = NULL;
571 /* create a URB, and a buffer for it */
572 urb = usb_alloc_urb(0, GFP_KERNEL);
578 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
581 dev_warn(dev->udev->dev.parent,
582 "No memory left for USB buffer\n");
587 urb->transfer_dma = buf_dma;
589 usb_fill_bulk_urb(urb, dev->udev,
590 usb_rcvbulkpipe(dev->udev, 1),
592 esd_usb2_read_bulk_callback, dev);
593 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
594 usb_anchor_urb(urb, &dev->rx_submitted);
596 err = usb_submit_urb(urb, GFP_KERNEL);
598 usb_unanchor_urb(urb);
599 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
605 dev->rxbuf_dma[i] = buf_dma;
608 /* Drop reference, USB core will take care of freeing it */
614 /* Did we submit any URBs */
616 dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n");
620 /* Warn if we've couldn't transmit all the URBs */
621 if (i < MAX_RX_URBS) {
622 dev_warn(dev->udev->dev.parent,
623 "rx performance may be slow\n");
633 static int esd_usb2_start(struct esd_usb2_net_priv *priv)
635 struct esd_usb2 *dev = priv->usb2;
636 struct net_device *netdev = priv->netdev;
637 struct esd_usb2_msg *msg;
640 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
648 * The IDADD message takes up to 64 32 bit bitmasks (2048 bits).
649 * Each bit represents one 11 bit CAN identifier. A set bit
650 * enables reception of the corresponding CAN identifier. A cleared
651 * bit disabled this identifier. An additional bitmask value
652 * following the CAN 2.0A bits is used to enable reception of
653 * extended CAN frames. Only the LSB of this final mask is checked
654 * for the complete 29 bit ID range. The IDADD message also allows
655 * filter configuration for an ID subset. In this case you can add
656 * the number of the starting bitmask (0..64) to the filter.option
657 * field followed by only some bitmasks.
659 msg->msg.hdr.cmd = CMD_IDADD;
660 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
661 msg->msg.filter.net = priv->index;
662 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
663 for (i = 0; i < ESD_MAX_ID_SEGMENT; i++)
664 msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff);
665 /* enable 29bit extended IDs */
666 msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001);
668 err = esd_usb2_send_msg(dev, msg);
672 err = esd_usb2_setup_rx_urbs(dev);
676 priv->can.state = CAN_STATE_ERROR_ACTIVE;
680 netif_device_detach(netdev);
682 netdev_err(netdev, "couldn't start device: %d\n", err);
688 static void unlink_all_urbs(struct esd_usb2 *dev)
690 struct esd_usb2_net_priv *priv;
693 usb_kill_anchored_urbs(&dev->rx_submitted);
695 for (i = 0; i < MAX_RX_URBS; ++i)
696 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
697 dev->rxbuf[i], dev->rxbuf_dma[i]);
699 for (i = 0; i < dev->net_count; i++) {
702 usb_kill_anchored_urbs(&priv->tx_submitted);
703 atomic_set(&priv->active_tx_jobs, 0);
705 for (j = 0; j < MAX_TX_URBS; j++)
706 priv->tx_contexts[j].echo_index = MAX_TX_URBS;
711 static int esd_usb2_open(struct net_device *netdev)
713 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
717 err = open_candev(netdev);
721 /* finally start device */
722 err = esd_usb2_start(priv);
724 netdev_warn(netdev, "couldn't start device: %d\n", err);
725 close_candev(netdev);
729 netif_start_queue(netdev);
734 static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb,
735 struct net_device *netdev)
737 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
738 struct esd_usb2 *dev = priv->usb2;
739 struct esd_tx_urb_context *context = NULL;
740 struct net_device_stats *stats = &netdev->stats;
741 struct can_frame *cf = (struct can_frame *)skb->data;
742 struct esd_usb2_msg *msg;
746 int ret = NETDEV_TX_OK;
747 size_t size = sizeof(struct esd_usb2_msg);
749 if (can_dropped_invalid_skb(netdev, skb))
752 /* create a URB, and a buffer for it, and copy the data to the URB */
753 urb = usb_alloc_urb(0, GFP_ATOMIC);
760 buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
763 netdev_err(netdev, "No memory left for USB buffer\n");
769 msg = (struct esd_usb2_msg *)buf;
771 msg->msg.hdr.len = 3; /* minimal length */
772 msg->msg.hdr.cmd = CMD_CAN_TX;
773 msg->msg.tx.net = priv->index;
774 msg->msg.tx.dlc = cf->can_dlc;
775 msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK);
777 if (cf->can_id & CAN_RTR_FLAG)
778 msg->msg.tx.dlc |= ESD_RTR;
780 if (cf->can_id & CAN_EFF_FLAG)
781 msg->msg.tx.id |= cpu_to_le32(ESD_EXTID);
783 for (i = 0; i < cf->can_dlc; i++)
784 msg->msg.tx.data[i] = cf->data[i];
786 msg->msg.hdr.len += (cf->can_dlc + 3) >> 2;
788 for (i = 0; i < MAX_TX_URBS; i++) {
789 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
790 context = &priv->tx_contexts[i];
796 * This may never happen.
799 netdev_warn(netdev, "couldn't find free context\n");
800 ret = NETDEV_TX_BUSY;
804 context->priv = priv;
805 context->echo_index = i;
806 context->dlc = cf->can_dlc;
808 /* hnd must not be 0 - MSB is stripped in txdone handling */
809 msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */
811 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
812 msg->msg.hdr.len << 2,
813 esd_usb2_write_bulk_callback, context);
815 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
817 usb_anchor_urb(urb, &priv->tx_submitted);
819 can_put_echo_skb(skb, netdev, context->echo_index);
821 atomic_inc(&priv->active_tx_jobs);
823 /* Slow down tx path */
824 if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS)
825 netif_stop_queue(netdev);
827 err = usb_submit_urb(urb, GFP_ATOMIC);
829 can_free_echo_skb(netdev, context->echo_index);
831 atomic_dec(&priv->active_tx_jobs);
832 usb_unanchor_urb(urb);
837 netif_device_detach(netdev);
839 netdev_warn(netdev, "failed tx_urb %d\n", err);
844 netif_trans_update(netdev);
847 * Release our reference to this URB, the USB core will eventually free
855 usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
864 static int esd_usb2_close(struct net_device *netdev)
866 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
867 struct esd_usb2_msg *msg;
870 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
874 /* Disable all IDs (see esd_usb2_start()) */
875 msg->msg.hdr.cmd = CMD_IDADD;
876 msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT;
877 msg->msg.filter.net = priv->index;
878 msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */
879 for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++)
880 msg->msg.filter.mask[i] = 0;
881 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
882 netdev_err(netdev, "sending idadd message failed\n");
884 /* set CAN controller to reset mode */
885 msg->msg.hdr.len = 2;
886 msg->msg.hdr.cmd = CMD_SETBAUD;
887 msg->msg.setbaud.net = priv->index;
888 msg->msg.setbaud.rsvd = 0;
889 msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE);
890 if (esd_usb2_send_msg(priv->usb2, msg) < 0)
891 netdev_err(netdev, "sending setbaud message failed\n");
893 priv->can.state = CAN_STATE_STOPPED;
895 netif_stop_queue(netdev);
897 close_candev(netdev);
904 static const struct net_device_ops esd_usb2_netdev_ops = {
905 .ndo_open = esd_usb2_open,
906 .ndo_stop = esd_usb2_close,
907 .ndo_start_xmit = esd_usb2_start_xmit,
908 .ndo_change_mtu = can_change_mtu,
911 static const struct can_bittiming_const esd_usb2_bittiming_const = {
913 .tseg1_min = ESD_USB2_TSEG1_MIN,
914 .tseg1_max = ESD_USB2_TSEG1_MAX,
915 .tseg2_min = ESD_USB2_TSEG2_MIN,
916 .tseg2_max = ESD_USB2_TSEG2_MAX,
917 .sjw_max = ESD_USB2_SJW_MAX,
918 .brp_min = ESD_USB2_BRP_MIN,
919 .brp_max = ESD_USB2_BRP_MAX,
920 .brp_inc = ESD_USB2_BRP_INC,
923 static int esd_usb2_set_bittiming(struct net_device *netdev)
925 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
926 struct can_bittiming *bt = &priv->can.bittiming;
927 struct esd_usb2_msg *msg;
932 canbtr = ESD_USB2_UBR;
933 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
934 canbtr |= ESD_USB2_LOM;
936 canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1);
938 if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) ==
939 USB_CANUSBM_PRODUCT_ID)
940 sjw_shift = ESD_USBM_SJW_SHIFT;
942 sjw_shift = ESD_USB2_SJW_SHIFT;
944 canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1))
946 canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1)
947 & (ESD_USB2_TSEG1_MAX - 1))
948 << ESD_USB2_TSEG1_SHIFT;
949 canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1))
950 << ESD_USB2_TSEG2_SHIFT;
951 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
952 canbtr |= ESD_USB2_3_SAMPLES;
954 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
958 msg->msg.hdr.len = 2;
959 msg->msg.hdr.cmd = CMD_SETBAUD;
960 msg->msg.setbaud.net = priv->index;
961 msg->msg.setbaud.rsvd = 0;
962 msg->msg.setbaud.baud = cpu_to_le32(canbtr);
964 netdev_info(netdev, "setting BTR=%#x\n", canbtr);
966 err = esd_usb2_send_msg(priv->usb2, msg);
972 static int esd_usb2_get_berr_counter(const struct net_device *netdev,
973 struct can_berr_counter *bec)
975 struct esd_usb2_net_priv *priv = netdev_priv(netdev);
977 bec->txerr = priv->bec.txerr;
978 bec->rxerr = priv->bec.rxerr;
983 static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode)
987 netif_wake_queue(netdev);
997 static int esd_usb2_probe_one_net(struct usb_interface *intf, int index)
999 struct esd_usb2 *dev = usb_get_intfdata(intf);
1000 struct net_device *netdev;
1001 struct esd_usb2_net_priv *priv;
1005 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1007 dev_err(&intf->dev, "couldn't alloc candev\n");
1012 priv = netdev_priv(netdev);
1014 init_usb_anchor(&priv->tx_submitted);
1015 atomic_set(&priv->active_tx_jobs, 0);
1017 for (i = 0; i < MAX_TX_URBS; i++)
1018 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1021 priv->netdev = netdev;
1022 priv->index = index;
1024 priv->can.state = CAN_STATE_STOPPED;
1025 priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
1027 if (le16_to_cpu(dev->udev->descriptor.idProduct) ==
1028 USB_CANUSBM_PRODUCT_ID)
1029 priv->can.clock.freq = ESD_USBM_CAN_CLOCK;
1031 priv->can.clock.freq = ESD_USB2_CAN_CLOCK;
1032 priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1035 priv->can.bittiming_const = &esd_usb2_bittiming_const;
1036 priv->can.do_set_bittiming = esd_usb2_set_bittiming;
1037 priv->can.do_set_mode = esd_usb2_set_mode;
1038 priv->can.do_get_berr_counter = esd_usb2_get_berr_counter;
1040 netdev->flags |= IFF_ECHO; /* we support local echo */
1042 netdev->netdev_ops = &esd_usb2_netdev_ops;
1044 SET_NETDEV_DEV(netdev, &intf->dev);
1045 netdev->dev_id = index;
1047 err = register_candev(netdev);
1049 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
1050 free_candev(netdev);
1055 dev->nets[index] = priv;
1056 netdev_info(netdev, "device %s registered\n", netdev->name);
1063 * probe function for new USB2 devices
1065 * check version information and number of available
1068 static int esd_usb2_probe(struct usb_interface *intf,
1069 const struct usb_device_id *id)
1071 struct esd_usb2 *dev;
1072 struct esd_usb2_msg *msg;
1075 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1081 dev->udev = interface_to_usbdev(intf);
1083 init_usb_anchor(&dev->rx_submitted);
1085 usb_set_intfdata(intf, dev);
1087 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1093 /* query number of CAN interfaces (nets) */
1094 msg->msg.hdr.cmd = CMD_VERSION;
1095 msg->msg.hdr.len = 2;
1096 msg->msg.version.rsvd = 0;
1097 msg->msg.version.flags = 0;
1098 msg->msg.version.drv_version = 0;
1100 err = esd_usb2_send_msg(dev, msg);
1102 dev_err(&intf->dev, "sending version message failed\n");
1106 err = esd_usb2_wait_msg(dev, msg);
1108 dev_err(&intf->dev, "no version message answer\n");
1112 dev->net_count = (int)msg->msg.version_reply.nets;
1113 dev->version = le32_to_cpu(msg->msg.version_reply.version);
1115 if (device_create_file(&intf->dev, &dev_attr_firmware))
1117 "Couldn't create device file for firmware\n");
1119 if (device_create_file(&intf->dev, &dev_attr_hardware))
1121 "Couldn't create device file for hardware\n");
1123 if (device_create_file(&intf->dev, &dev_attr_nets))
1125 "Couldn't create device file for nets\n");
1127 /* do per device probing */
1128 for (i = 0; i < dev->net_count; i++)
1129 esd_usb2_probe_one_net(intf, i);
1140 * called by the usb core when the device is removed from the system
1142 static void esd_usb2_disconnect(struct usb_interface *intf)
1144 struct esd_usb2 *dev = usb_get_intfdata(intf);
1145 struct net_device *netdev;
1148 device_remove_file(&intf->dev, &dev_attr_firmware);
1149 device_remove_file(&intf->dev, &dev_attr_hardware);
1150 device_remove_file(&intf->dev, &dev_attr_nets);
1152 usb_set_intfdata(intf, NULL);
1155 for (i = 0; i < dev->net_count; i++) {
1157 netdev = dev->nets[i]->netdev;
1158 unregister_netdev(netdev);
1159 free_candev(netdev);
1162 unlink_all_urbs(dev);
1167 /* usb specific object needed to register this driver with the usb subsystem */
1168 static struct usb_driver esd_usb2_driver = {
1170 .probe = esd_usb2_probe,
1171 .disconnect = esd_usb2_disconnect,
1172 .id_table = esd_usb2_table,
1175 module_usb_driver(esd_usb2_driver);