2 * CAN driver for "8 devices" USB2CAN converter
4 * Copyright (C) 2012 Bernd Krumboeck (krumboeck@universalnet.at)
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
18 * This driver is inspired by the 3.2.0 version of drivers/net/can/usb/ems_usb.c
19 * and drivers/net/can/usb/esd_usb2.c
21 * Many thanks to Gerhard Bertelsmann (info@gerhard-bertelsmann.de)
22 * for testing and fixing this driver. Also many thanks to "8 devices",
23 * who were very cooperative and answered my questions.
26 #include <linux/signal.h>
27 #include <linux/slab.h>
28 #include <linux/module.h>
29 #include <linux/netdevice.h>
30 #include <linux/usb.h>
32 #include <linux/can.h>
33 #include <linux/can/dev.h>
34 #include <linux/can/error.h>
35 #include <linux/can/led.h>
37 /* driver constants */
38 #define MAX_RX_URBS 20
39 #define MAX_TX_URBS 20
40 #define RX_BUFFER_SIZE 64
42 /* vendor and product id */
43 #define USB_8DEV_VENDOR_ID 0x0483
44 #define USB_8DEV_PRODUCT_ID 0x1234
47 enum usb_8dev_endpoint {
48 USB_8DEV_ENDP_DATA_RX = 1,
49 USB_8DEV_ENDP_DATA_TX,
54 /* device CAN clock */
55 #define USB_8DEV_ABP_CLOCK 32000000
58 #define USB_8DEV_SILENT 0x01
59 #define USB_8DEV_LOOPBACK 0x02
60 #define USB_8DEV_DISABLE_AUTO_RESTRANS 0x04
61 #define USB_8DEV_STATUS_FRAME 0x08
69 USB_8DEV_SET_MASK_FILTER,
71 USB_8DEV_GET_STATISTICS,
73 USB_8DEV_GET_SOFTW_VER,
74 USB_8DEV_GET_HARDW_VER,
75 USB_8DEV_RESET_TIMESTAMP,
76 USB_8DEV_GET_SOFTW_HARDW_VER
80 #define USB_8DEV_BAUD_MANUAL 0x09
81 #define USB_8DEV_CMD_START 0x11
82 #define USB_8DEV_CMD_END 0x22
84 #define USB_8DEV_CMD_SUCCESS 0
85 #define USB_8DEV_CMD_ERROR 255
87 #define USB_8DEV_CMD_TIMEOUT 1000
90 #define USB_8DEV_DATA_START 0x55
91 #define USB_8DEV_DATA_END 0xAA
93 #define USB_8DEV_TYPE_CAN_FRAME 0
94 #define USB_8DEV_TYPE_ERROR_FRAME 3
96 #define USB_8DEV_EXTID 0x01
97 #define USB_8DEV_RTR 0x02
98 #define USB_8DEV_ERR_FLAG 0x04
101 #define USB_8DEV_STATUSMSG_OK 0x00 /* Normal condition. */
102 #define USB_8DEV_STATUSMSG_OVERRUN 0x01 /* Overrun occured when sending */
103 #define USB_8DEV_STATUSMSG_BUSLIGHT 0x02 /* Error counter has reached 96 */
104 #define USB_8DEV_STATUSMSG_BUSHEAVY 0x03 /* Error count. has reached 128 */
105 #define USB_8DEV_STATUSMSG_BUSOFF 0x04 /* Device is in BUSOFF */
106 #define USB_8DEV_STATUSMSG_STUFF 0x20 /* Stuff Error */
107 #define USB_8DEV_STATUSMSG_FORM 0x21 /* Form Error */
108 #define USB_8DEV_STATUSMSG_ACK 0x23 /* Ack Error */
109 #define USB_8DEV_STATUSMSG_BIT0 0x24 /* Bit1 Error */
110 #define USB_8DEV_STATUSMSG_BIT1 0x25 /* Bit0 Error */
111 #define USB_8DEV_STATUSMSG_CRC 0x27 /* CRC Error */
113 #define USB_8DEV_RP_MASK 0x7F /* Mask for Receive Error Bit */
116 /* table of devices that work with this driver */
117 static const struct usb_device_id usb_8dev_table[] = {
118 { USB_DEVICE(USB_8DEV_VENDOR_ID, USB_8DEV_PRODUCT_ID) },
119 { } /* Terminating entry */
122 MODULE_DEVICE_TABLE(usb, usb_8dev_table);
124 struct usb_8dev_tx_urb_context {
125 struct usb_8dev_priv *priv;
131 /* Structure to hold all of our device specific stuff */
132 struct usb_8dev_priv {
133 struct can_priv can; /* must be the first member */
135 struct sk_buff *echo_skb[MAX_TX_URBS];
137 struct usb_device *udev;
138 struct net_device *netdev;
140 atomic_t active_tx_urbs;
141 struct usb_anchor tx_submitted;
142 struct usb_8dev_tx_urb_context tx_contexts[MAX_TX_URBS];
144 struct usb_anchor rx_submitted;
146 struct can_berr_counter bec;
150 struct mutex usb_8dev_cmd_lock;
155 struct __packed usb_8dev_tx_msg {
157 u8 flags; /* RTR and EXT_ID flag */
158 __be32 id; /* upper 3 bits not used */
159 u8 dlc; /* data length code 0-8 bytes */
160 u8 data[8]; /* 64-bit data */
165 struct __packed usb_8dev_rx_msg {
167 u8 type; /* frame type */
168 u8 flags; /* RTR and EXT_ID flag */
169 __be32 id; /* upper 3 bits not used */
170 u8 dlc; /* data length code 0-8 bytes */
171 u8 data[8]; /* 64-bit data */
172 __be32 timestamp; /* 32-bit timestamp */
177 struct __packed usb_8dev_cmd_msg {
179 u8 channel; /* unkown - always 0 */
180 u8 command; /* command to execute */
181 u8 opt1; /* optional parameter / return value */
182 u8 opt2; /* optional parameter 2 */
183 u8 data[10]; /* optional parameter and data */
187 static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size)
191 return usb_bulk_msg(priv->udev,
192 usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX),
193 msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT);
196 static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size,
199 return usb_bulk_msg(priv->udev,
200 usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX),
201 msg, size, actual_length, USB_8DEV_CMD_TIMEOUT);
204 /* Send command to device and receive result.
205 * Command was successful when opt1 = 0.
207 static int usb_8dev_send_cmd(struct usb_8dev_priv *priv,
208 struct usb_8dev_cmd_msg *out,
209 struct usb_8dev_cmd_msg *in)
213 struct net_device *netdev;
215 netdev = priv->netdev;
217 out->begin = USB_8DEV_CMD_START;
218 out->end = USB_8DEV_CMD_END;
220 mutex_lock(&priv->usb_8dev_cmd_lock);
222 memcpy(priv->cmd_msg_buffer, out,
223 sizeof(struct usb_8dev_cmd_msg));
225 err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer,
226 sizeof(struct usb_8dev_cmd_msg));
228 netdev_err(netdev, "sending command message failed\n");
232 err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer,
233 sizeof(struct usb_8dev_cmd_msg),
236 netdev_err(netdev, "no command message answer\n");
240 memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg));
242 if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END ||
243 num_bytes_read != 16 || in->opt1 != 0)
247 mutex_unlock(&priv->usb_8dev_cmd_lock);
251 /* Send open command to device */
252 static int usb_8dev_cmd_open(struct usb_8dev_priv *priv)
254 struct can_bittiming *bt = &priv->can.bittiming;
255 struct usb_8dev_cmd_msg outmsg;
256 struct usb_8dev_cmd_msg inmsg;
257 u32 ctrlmode = priv->can.ctrlmode;
258 u32 flags = USB_8DEV_STATUS_FRAME;
262 memset(&outmsg, 0, sizeof(outmsg));
263 outmsg.command = USB_8DEV_OPEN;
264 outmsg.opt1 = USB_8DEV_BAUD_MANUAL;
265 outmsg.data[0] = bt->prop_seg + bt->phase_seg1;
266 outmsg.data[1] = bt->phase_seg2;
267 outmsg.data[2] = bt->sjw;
270 bebrp = cpu_to_be16((u16)bt->brp);
271 memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp));
274 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
275 flags |= USB_8DEV_LOOPBACK;
276 if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
277 flags |= USB_8DEV_SILENT;
278 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
279 flags |= USB_8DEV_DISABLE_AUTO_RESTRANS;
281 beflags = cpu_to_be32(flags);
282 memcpy(&outmsg.data[5], &beflags, sizeof(beflags));
284 return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
287 /* Send close command to device */
288 static int usb_8dev_cmd_close(struct usb_8dev_priv *priv)
290 struct usb_8dev_cmd_msg inmsg;
291 struct usb_8dev_cmd_msg outmsg = {
293 .command = USB_8DEV_CLOSE,
298 return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
301 /* Get firmware and hardware version */
302 static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res)
304 struct usb_8dev_cmd_msg inmsg;
305 struct usb_8dev_cmd_msg outmsg = {
307 .command = USB_8DEV_GET_SOFTW_HARDW_VER,
312 int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg);
316 *res = be32_to_cpup((__be32 *)inmsg.data);
321 /* Set network device mode
323 * Maybe we should leave this function empty, because the device
324 * set mode variable with open command.
326 static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode)
328 struct usb_8dev_priv *priv = netdev_priv(netdev);
333 err = usb_8dev_cmd_open(priv);
335 netdev_warn(netdev, "couldn't start device");
345 /* Read error/status frames */
346 static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
347 struct usb_8dev_rx_msg *msg)
349 struct can_frame *cf;
351 struct net_device_stats *stats = &priv->netdev->stats;
355 * byte 1: bit 7: Receive Passive
356 * byte 1: bit 0-6: Receive Error Counter
357 * byte 2: Transmit Error Counter
358 * byte 3: Always 0 (maybe reserved for future use)
361 u8 state = msg->data[0];
362 u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK;
363 u8 txerr = msg->data[2];
367 skb = alloc_can_err_skb(priv->netdev, &cf);
372 case USB_8DEV_STATUSMSG_OK:
373 priv->can.state = CAN_STATE_ERROR_ACTIVE;
374 cf->can_id |= CAN_ERR_PROT;
375 cf->data[2] = CAN_ERR_PROT_ACTIVE;
377 case USB_8DEV_STATUSMSG_BUSOFF:
378 priv->can.state = CAN_STATE_BUS_OFF;
379 cf->can_id |= CAN_ERR_BUSOFF;
380 priv->can.can_stats.bus_off++;
381 can_bus_off(priv->netdev);
383 case USB_8DEV_STATUSMSG_OVERRUN:
384 case USB_8DEV_STATUSMSG_BUSLIGHT:
385 case USB_8DEV_STATUSMSG_BUSHEAVY:
386 cf->can_id |= CAN_ERR_CRTL;
389 priv->can.state = CAN_STATE_ERROR_WARNING;
390 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
391 priv->can.can_stats.bus_error++;
396 case USB_8DEV_STATUSMSG_OK:
397 case USB_8DEV_STATUSMSG_BUSOFF:
399 case USB_8DEV_STATUSMSG_ACK:
400 cf->can_id |= CAN_ERR_ACK;
403 case USB_8DEV_STATUSMSG_CRC:
404 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
407 case USB_8DEV_STATUSMSG_BIT0:
408 cf->data[2] |= CAN_ERR_PROT_BIT0;
411 case USB_8DEV_STATUSMSG_BIT1:
412 cf->data[2] |= CAN_ERR_PROT_BIT1;
415 case USB_8DEV_STATUSMSG_FORM:
416 cf->data[2] |= CAN_ERR_PROT_FORM;
419 case USB_8DEV_STATUSMSG_STUFF:
420 cf->data[2] |= CAN_ERR_PROT_STUFF;
423 case USB_8DEV_STATUSMSG_OVERRUN:
424 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
425 stats->rx_over_errors++;
428 case USB_8DEV_STATUSMSG_BUSLIGHT:
429 priv->can.state = CAN_STATE_ERROR_WARNING;
430 cf->data[1] = (txerr > rxerr) ?
431 CAN_ERR_CRTL_TX_WARNING :
432 CAN_ERR_CRTL_RX_WARNING;
433 priv->can.can_stats.error_warning++;
435 case USB_8DEV_STATUSMSG_BUSHEAVY:
436 priv->can.state = CAN_STATE_ERROR_PASSIVE;
437 cf->data[1] = (txerr > rxerr) ?
438 CAN_ERR_CRTL_TX_PASSIVE :
439 CAN_ERR_CRTL_RX_PASSIVE;
440 priv->can.can_stats.error_passive++;
443 netdev_warn(priv->netdev,
444 "Unknown status/error message (%d)\n", state);
449 cf->data[2] |= CAN_ERR_PROT_TX;
459 priv->bec.txerr = txerr;
460 priv->bec.rxerr = rxerr;
463 stats->rx_bytes += cf->can_dlc;
467 /* Read data and status frames */
468 static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
469 struct usb_8dev_rx_msg *msg)
471 struct can_frame *cf;
473 struct net_device_stats *stats = &priv->netdev->stats;
475 if (msg->type == USB_8DEV_TYPE_ERROR_FRAME &&
476 msg->flags == USB_8DEV_ERR_FLAG) {
477 usb_8dev_rx_err_msg(priv, msg);
478 } else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) {
479 skb = alloc_can_skb(priv->netdev, &cf);
483 cf->can_id = be32_to_cpu(msg->id);
484 cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
486 if (msg->flags & USB_8DEV_EXTID)
487 cf->can_id |= CAN_EFF_FLAG;
489 if (msg->flags & USB_8DEV_RTR)
490 cf->can_id |= CAN_RTR_FLAG;
492 memcpy(cf->data, msg->data, cf->can_dlc);
495 stats->rx_bytes += cf->can_dlc;
498 can_led_event(priv->netdev, CAN_LED_EVENT_RX);
500 netdev_warn(priv->netdev, "frame type %d unknown",
506 /* Callback for reading data from device
508 * Check urb status, call read function and resubmit urb read operation.
510 static void usb_8dev_read_bulk_callback(struct urb *urb)
512 struct usb_8dev_priv *priv = urb->context;
513 struct net_device *netdev;
517 netdev = priv->netdev;
519 if (!netif_device_present(netdev))
522 switch (urb->status) {
523 case 0: /* success */
531 netdev_info(netdev, "Rx URB aborted (%d)\n",
536 while (pos < urb->actual_length) {
537 struct usb_8dev_rx_msg *msg;
539 if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) {
540 netdev_err(priv->netdev, "format error\n");
544 msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos);
545 usb_8dev_rx_can_msg(priv, msg);
547 pos += sizeof(struct usb_8dev_rx_msg);
551 usb_fill_bulk_urb(urb, priv->udev,
552 usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX),
553 urb->transfer_buffer, RX_BUFFER_SIZE,
554 usb_8dev_read_bulk_callback, priv);
556 retval = usb_submit_urb(urb, GFP_ATOMIC);
558 if (retval == -ENODEV)
559 netif_device_detach(netdev);
562 "failed resubmitting read bulk urb: %d\n", retval);
565 /* Callback handler for write operations
567 * Free allocated buffers, check transmit status and
568 * calculate statistic.
570 static void usb_8dev_write_bulk_callback(struct urb *urb)
572 struct usb_8dev_tx_urb_context *context = urb->context;
573 struct usb_8dev_priv *priv;
574 struct net_device *netdev;
578 priv = context->priv;
579 netdev = priv->netdev;
581 /* free up our allocated buffer */
582 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
583 urb->transfer_buffer, urb->transfer_dma);
585 atomic_dec(&priv->active_tx_urbs);
587 if (!netif_device_present(netdev))
591 netdev_info(netdev, "Tx URB aborted (%d)\n",
594 netdev->stats.tx_packets++;
595 netdev->stats.tx_bytes += context->dlc;
597 can_get_echo_skb(netdev, context->echo_index);
599 can_led_event(netdev, CAN_LED_EVENT_TX);
601 /* Release context */
602 context->echo_index = MAX_TX_URBS;
604 netif_wake_queue(netdev);
607 /* Send data to device */
608 static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
609 struct net_device *netdev)
611 struct usb_8dev_priv *priv = netdev_priv(netdev);
612 struct net_device_stats *stats = &netdev->stats;
613 struct can_frame *cf = (struct can_frame *) skb->data;
614 struct usb_8dev_tx_msg *msg;
616 struct usb_8dev_tx_urb_context *context = NULL;
619 size_t size = sizeof(struct usb_8dev_tx_msg);
621 if (can_dropped_invalid_skb(netdev, skb))
624 /* create a URB, and a buffer for it, and copy the data to the URB */
625 urb = usb_alloc_urb(0, GFP_ATOMIC);
627 netdev_err(netdev, "No memory left for URBs\n");
631 buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC,
634 netdev_err(netdev, "No memory left for USB buffer\n");
638 memset(buf, 0, size);
640 msg = (struct usb_8dev_tx_msg *)buf;
641 msg->begin = USB_8DEV_DATA_START;
644 if (cf->can_id & CAN_RTR_FLAG)
645 msg->flags |= USB_8DEV_RTR;
647 if (cf->can_id & CAN_EFF_FLAG)
648 msg->flags |= USB_8DEV_EXTID;
650 msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
651 msg->dlc = cf->can_dlc;
652 memcpy(msg->data, cf->data, cf->can_dlc);
653 msg->end = USB_8DEV_DATA_END;
655 for (i = 0; i < MAX_TX_URBS; i++) {
656 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
657 context = &priv->tx_contexts[i];
662 /* May never happen! When this happens we'd more URBs in flight as
663 * allowed (MAX_TX_URBS).
668 context->priv = priv;
669 context->echo_index = i;
670 context->dlc = cf->can_dlc;
672 usb_fill_bulk_urb(urb, priv->udev,
673 usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX),
674 buf, size, usb_8dev_write_bulk_callback, context);
675 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
676 usb_anchor_urb(urb, &priv->tx_submitted);
678 can_put_echo_skb(skb, netdev, context->echo_index);
680 atomic_inc(&priv->active_tx_urbs);
682 err = usb_submit_urb(urb, GFP_ATOMIC);
685 else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
686 /* Slow down tx path */
687 netif_stop_queue(netdev);
689 /* Release our reference to this URB, the USB core will eventually free
697 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
700 netdev_warn(netdev, "couldn't find free context");
702 return NETDEV_TX_BUSY;
705 can_free_echo_skb(netdev, context->echo_index);
707 usb_unanchor_urb(urb);
708 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
710 atomic_dec(&priv->active_tx_urbs);
713 netif_device_detach(netdev);
715 netdev_warn(netdev, "failed tx_urb %d\n", err);
727 static int usb_8dev_get_berr_counter(const struct net_device *netdev,
728 struct can_berr_counter *bec)
730 struct usb_8dev_priv *priv = netdev_priv(netdev);
732 bec->txerr = priv->bec.txerr;
733 bec->rxerr = priv->bec.rxerr;
738 /* Start USB device */
739 static int usb_8dev_start(struct usb_8dev_priv *priv)
741 struct net_device *netdev = priv->netdev;
744 for (i = 0; i < MAX_RX_URBS; i++) {
745 struct urb *urb = NULL;
748 /* create a URB, and a buffer for it */
749 urb = usb_alloc_urb(0, GFP_KERNEL);
751 netdev_err(netdev, "No memory left for URBs\n");
756 buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL,
759 netdev_err(netdev, "No memory left for USB buffer\n");
765 usb_fill_bulk_urb(urb, priv->udev,
766 usb_rcvbulkpipe(priv->udev,
767 USB_8DEV_ENDP_DATA_RX),
769 usb_8dev_read_bulk_callback, priv);
770 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
771 usb_anchor_urb(urb, &priv->rx_submitted);
773 err = usb_submit_urb(urb, GFP_KERNEL);
775 usb_unanchor_urb(urb);
776 usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf,
782 /* Drop reference, USB core will take care of freeing it */
786 /* Did we submit any URBs */
788 netdev_warn(netdev, "couldn't setup read URBs\n");
792 /* Warn if we've couldn't transmit all the URBs */
794 netdev_warn(netdev, "rx performance may be slow\n");
796 err = usb_8dev_cmd_open(priv);
800 priv->can.state = CAN_STATE_ERROR_ACTIVE;
806 netif_device_detach(priv->netdev);
808 netdev_warn(netdev, "couldn't submit control: %d\n", err);
813 /* Open USB device */
814 static int usb_8dev_open(struct net_device *netdev)
816 struct usb_8dev_priv *priv = netdev_priv(netdev);
820 err = open_candev(netdev);
824 can_led_event(netdev, CAN_LED_EVENT_OPEN);
826 /* finally start device */
827 err = usb_8dev_start(priv);
830 netif_device_detach(priv->netdev);
832 netdev_warn(netdev, "couldn't start device: %d\n",
835 close_candev(netdev);
840 netif_start_queue(netdev);
845 static void unlink_all_urbs(struct usb_8dev_priv *priv)
849 usb_kill_anchored_urbs(&priv->rx_submitted);
851 usb_kill_anchored_urbs(&priv->tx_submitted);
852 atomic_set(&priv->active_tx_urbs, 0);
854 for (i = 0; i < MAX_TX_URBS; i++)
855 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
858 /* Close USB device */
859 static int usb_8dev_close(struct net_device *netdev)
861 struct usb_8dev_priv *priv = netdev_priv(netdev);
864 /* Send CLOSE command to CAN controller */
865 err = usb_8dev_cmd_close(priv);
867 netdev_warn(netdev, "couldn't stop device");
869 priv->can.state = CAN_STATE_STOPPED;
871 netif_stop_queue(netdev);
874 unlink_all_urbs(priv);
876 close_candev(netdev);
878 can_led_event(netdev, CAN_LED_EVENT_STOP);
883 static const struct net_device_ops usb_8dev_netdev_ops = {
884 .ndo_open = usb_8dev_open,
885 .ndo_stop = usb_8dev_close,
886 .ndo_start_xmit = usb_8dev_start_xmit,
887 .ndo_change_mtu = can_change_mtu,
890 static const struct can_bittiming_const usb_8dev_bittiming_const = {
904 * Check device and firmware.
905 * Set supported modes and bittiming constants.
906 * Allocate some memory.
908 static int usb_8dev_probe(struct usb_interface *intf,
909 const struct usb_device_id *id)
911 struct net_device *netdev;
912 struct usb_8dev_priv *priv;
913 int i, err = -ENOMEM;
916 struct usb_device *usbdev = interface_to_usbdev(intf);
918 /* product id looks strange, better we also check iProduct string */
919 if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
920 sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
921 dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
925 netdev = alloc_candev(sizeof(struct usb_8dev_priv), MAX_TX_URBS);
927 dev_err(&intf->dev, "Couldn't alloc candev\n");
931 priv = netdev_priv(netdev);
934 priv->netdev = netdev;
936 priv->can.state = CAN_STATE_STOPPED;
937 priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
938 priv->can.bittiming_const = &usb_8dev_bittiming_const;
939 priv->can.do_set_mode = usb_8dev_set_mode;
940 priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
941 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
942 CAN_CTRLMODE_LISTENONLY |
943 CAN_CTRLMODE_ONE_SHOT;
945 netdev->netdev_ops = &usb_8dev_netdev_ops;
947 netdev->flags |= IFF_ECHO; /* we support local echo */
949 init_usb_anchor(&priv->rx_submitted);
951 init_usb_anchor(&priv->tx_submitted);
952 atomic_set(&priv->active_tx_urbs, 0);
954 for (i = 0; i < MAX_TX_URBS; i++)
955 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
957 priv->cmd_msg_buffer = devm_kzalloc(&intf->dev, sizeof(struct usb_8dev_cmd_msg),
959 if (!priv->cmd_msg_buffer)
962 usb_set_intfdata(intf, priv);
964 SET_NETDEV_DEV(netdev, &intf->dev);
966 mutex_init(&priv->usb_8dev_cmd_lock);
968 err = register_candev(netdev);
971 "couldn't register CAN device: %d\n", err);
975 err = usb_8dev_cmd_version(priv, &version);
977 netdev_err(netdev, "can't get firmware version\n");
978 goto cleanup_unregister_candev;
981 "firmware: %d.%d, hardware: %d.%d\n",
982 (version>>24) & 0xff, (version>>16) & 0xff,
983 (version>>8) & 0xff, version & 0xff);
986 devm_can_led_init(netdev);
990 cleanup_unregister_candev:
991 unregister_netdev(priv->netdev);
1000 /* Called by the usb core when driver is unloaded or device is removed */
1001 static void usb_8dev_disconnect(struct usb_interface *intf)
1003 struct usb_8dev_priv *priv = usb_get_intfdata(intf);
1005 usb_set_intfdata(intf, NULL);
1008 netdev_info(priv->netdev, "device disconnected\n");
1010 unregister_netdev(priv->netdev);
1011 free_candev(priv->netdev);
1013 unlink_all_urbs(priv);
1018 static struct usb_driver usb_8dev_driver = {
1020 .probe = usb_8dev_probe,
1021 .disconnect = usb_8dev_disconnect,
1022 .id_table = usb_8dev_table,
1025 module_usb_driver(usb_8dev_driver);
1027 MODULE_AUTHOR("Bernd Krumboeck <krumboeck@universalnet.at>");
1028 MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces");
1029 MODULE_LICENSE("GPL v2");