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;
151 void *rxbuf[MAX_RX_URBS];
152 dma_addr_t rxbuf_dma[MAX_RX_URBS];
156 struct __packed usb_8dev_tx_msg {
158 u8 flags; /* RTR and EXT_ID flag */
159 __be32 id; /* upper 3 bits not used */
160 u8 dlc; /* data length code 0-8 bytes */
161 u8 data[8]; /* 64-bit data */
166 struct __packed usb_8dev_rx_msg {
168 u8 type; /* frame type */
169 u8 flags; /* RTR and EXT_ID flag */
170 __be32 id; /* upper 3 bits not used */
171 u8 dlc; /* data length code 0-8 bytes */
172 u8 data[8]; /* 64-bit data */
173 __be32 timestamp; /* 32-bit timestamp */
178 struct __packed usb_8dev_cmd_msg {
180 u8 channel; /* unkown - always 0 */
181 u8 command; /* command to execute */
182 u8 opt1; /* optional parameter / return value */
183 u8 opt2; /* optional parameter 2 */
184 u8 data[10]; /* optional parameter and data */
188 static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size)
192 return usb_bulk_msg(priv->udev,
193 usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX),
194 msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT);
197 static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size,
200 return usb_bulk_msg(priv->udev,
201 usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX),
202 msg, size, actual_length, USB_8DEV_CMD_TIMEOUT);
205 /* Send command to device and receive result.
206 * Command was successful when opt1 = 0.
208 static int usb_8dev_send_cmd(struct usb_8dev_priv *priv,
209 struct usb_8dev_cmd_msg *out,
210 struct usb_8dev_cmd_msg *in)
214 struct net_device *netdev;
216 netdev = priv->netdev;
218 out->begin = USB_8DEV_CMD_START;
219 out->end = USB_8DEV_CMD_END;
221 mutex_lock(&priv->usb_8dev_cmd_lock);
223 memcpy(priv->cmd_msg_buffer, out,
224 sizeof(struct usb_8dev_cmd_msg));
226 err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer,
227 sizeof(struct usb_8dev_cmd_msg));
229 netdev_err(netdev, "sending command message failed\n");
233 err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer,
234 sizeof(struct usb_8dev_cmd_msg),
237 netdev_err(netdev, "no command message answer\n");
241 memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg));
243 if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END ||
244 num_bytes_read != 16 || in->opt1 != 0)
248 mutex_unlock(&priv->usb_8dev_cmd_lock);
252 /* Send open command to device */
253 static int usb_8dev_cmd_open(struct usb_8dev_priv *priv)
255 struct can_bittiming *bt = &priv->can.bittiming;
256 struct usb_8dev_cmd_msg outmsg;
257 struct usb_8dev_cmd_msg inmsg;
258 u32 ctrlmode = priv->can.ctrlmode;
259 u32 flags = USB_8DEV_STATUS_FRAME;
263 memset(&outmsg, 0, sizeof(outmsg));
264 outmsg.command = USB_8DEV_OPEN;
265 outmsg.opt1 = USB_8DEV_BAUD_MANUAL;
266 outmsg.data[0] = bt->prop_seg + bt->phase_seg1;
267 outmsg.data[1] = bt->phase_seg2;
268 outmsg.data[2] = bt->sjw;
271 bebrp = cpu_to_be16((u16)bt->brp);
272 memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp));
275 if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
276 flags |= USB_8DEV_LOOPBACK;
277 if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
278 flags |= USB_8DEV_SILENT;
279 if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
280 flags |= USB_8DEV_DISABLE_AUTO_RESTRANS;
282 beflags = cpu_to_be32(flags);
283 memcpy(&outmsg.data[5], &beflags, sizeof(beflags));
285 return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
288 /* Send close command to device */
289 static int usb_8dev_cmd_close(struct usb_8dev_priv *priv)
291 struct usb_8dev_cmd_msg inmsg;
292 struct usb_8dev_cmd_msg outmsg = {
294 .command = USB_8DEV_CLOSE,
299 return usb_8dev_send_cmd(priv, &outmsg, &inmsg);
302 /* Get firmware and hardware version */
303 static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res)
305 struct usb_8dev_cmd_msg inmsg;
306 struct usb_8dev_cmd_msg outmsg = {
308 .command = USB_8DEV_GET_SOFTW_HARDW_VER,
313 int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg);
317 *res = be32_to_cpup((__be32 *)inmsg.data);
322 /* Set network device mode
324 * Maybe we should leave this function empty, because the device
325 * set mode variable with open command.
327 static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode)
329 struct usb_8dev_priv *priv = netdev_priv(netdev);
334 err = usb_8dev_cmd_open(priv);
336 netdev_warn(netdev, "couldn't start device");
346 /* Read error/status frames */
347 static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv,
348 struct usb_8dev_rx_msg *msg)
350 struct can_frame *cf;
352 struct net_device_stats *stats = &priv->netdev->stats;
356 * byte 1: bit 7: Receive Passive
357 * byte 1: bit 0-6: Receive Error Counter
358 * byte 2: Transmit Error Counter
359 * byte 3: Always 0 (maybe reserved for future use)
362 u8 state = msg->data[0];
363 u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK;
364 u8 txerr = msg->data[2];
368 skb = alloc_can_err_skb(priv->netdev, &cf);
373 case USB_8DEV_STATUSMSG_OK:
374 priv->can.state = CAN_STATE_ERROR_ACTIVE;
375 cf->can_id |= CAN_ERR_PROT;
376 cf->data[2] = CAN_ERR_PROT_ACTIVE;
378 case USB_8DEV_STATUSMSG_BUSOFF:
379 priv->can.state = CAN_STATE_BUS_OFF;
380 cf->can_id |= CAN_ERR_BUSOFF;
381 priv->can.can_stats.bus_off++;
382 can_bus_off(priv->netdev);
384 case USB_8DEV_STATUSMSG_OVERRUN:
385 case USB_8DEV_STATUSMSG_BUSLIGHT:
386 case USB_8DEV_STATUSMSG_BUSHEAVY:
387 cf->can_id |= CAN_ERR_CRTL;
390 priv->can.state = CAN_STATE_ERROR_WARNING;
391 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
392 priv->can.can_stats.bus_error++;
397 case USB_8DEV_STATUSMSG_OK:
398 case USB_8DEV_STATUSMSG_BUSOFF:
400 case USB_8DEV_STATUSMSG_ACK:
401 cf->can_id |= CAN_ERR_ACK;
404 case USB_8DEV_STATUSMSG_CRC:
405 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
408 case USB_8DEV_STATUSMSG_BIT0:
409 cf->data[2] |= CAN_ERR_PROT_BIT0;
412 case USB_8DEV_STATUSMSG_BIT1:
413 cf->data[2] |= CAN_ERR_PROT_BIT1;
416 case USB_8DEV_STATUSMSG_FORM:
417 cf->data[2] |= CAN_ERR_PROT_FORM;
420 case USB_8DEV_STATUSMSG_STUFF:
421 cf->data[2] |= CAN_ERR_PROT_STUFF;
424 case USB_8DEV_STATUSMSG_OVERRUN:
425 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
426 stats->rx_over_errors++;
429 case USB_8DEV_STATUSMSG_BUSLIGHT:
430 priv->can.state = CAN_STATE_ERROR_WARNING;
431 cf->data[1] = (txerr > rxerr) ?
432 CAN_ERR_CRTL_TX_WARNING :
433 CAN_ERR_CRTL_RX_WARNING;
434 priv->can.can_stats.error_warning++;
436 case USB_8DEV_STATUSMSG_BUSHEAVY:
437 priv->can.state = CAN_STATE_ERROR_PASSIVE;
438 cf->data[1] = (txerr > rxerr) ?
439 CAN_ERR_CRTL_TX_PASSIVE :
440 CAN_ERR_CRTL_RX_PASSIVE;
441 priv->can.can_stats.error_passive++;
444 netdev_warn(priv->netdev,
445 "Unknown status/error message (%d)\n", state);
450 cf->data[2] |= CAN_ERR_PROT_TX;
460 priv->bec.txerr = txerr;
461 priv->bec.rxerr = rxerr;
464 stats->rx_bytes += cf->can_dlc;
468 /* Read data and status frames */
469 static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv,
470 struct usb_8dev_rx_msg *msg)
472 struct can_frame *cf;
474 struct net_device_stats *stats = &priv->netdev->stats;
476 if (msg->type == USB_8DEV_TYPE_ERROR_FRAME &&
477 msg->flags == USB_8DEV_ERR_FLAG) {
478 usb_8dev_rx_err_msg(priv, msg);
479 } else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) {
480 skb = alloc_can_skb(priv->netdev, &cf);
484 cf->can_id = be32_to_cpu(msg->id);
485 cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
487 if (msg->flags & USB_8DEV_EXTID)
488 cf->can_id |= CAN_EFF_FLAG;
490 if (msg->flags & USB_8DEV_RTR)
491 cf->can_id |= CAN_RTR_FLAG;
493 memcpy(cf->data, msg->data, cf->can_dlc);
496 stats->rx_bytes += cf->can_dlc;
499 can_led_event(priv->netdev, CAN_LED_EVENT_RX);
501 netdev_warn(priv->netdev, "frame type %d unknown",
507 /* Callback for reading data from device
509 * Check urb status, call read function and resubmit urb read operation.
511 static void usb_8dev_read_bulk_callback(struct urb *urb)
513 struct usb_8dev_priv *priv = urb->context;
514 struct net_device *netdev;
518 netdev = priv->netdev;
520 if (!netif_device_present(netdev))
523 switch (urb->status) {
524 case 0: /* success */
534 netdev_info(netdev, "Rx URB aborted (%d)\n",
539 while (pos < urb->actual_length) {
540 struct usb_8dev_rx_msg *msg;
542 if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) {
543 netdev_err(priv->netdev, "format error\n");
547 msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos);
548 usb_8dev_rx_can_msg(priv, msg);
550 pos += sizeof(struct usb_8dev_rx_msg);
554 usb_fill_bulk_urb(urb, priv->udev,
555 usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX),
556 urb->transfer_buffer, RX_BUFFER_SIZE,
557 usb_8dev_read_bulk_callback, priv);
559 retval = usb_submit_urb(urb, GFP_ATOMIC);
561 if (retval == -ENODEV)
562 netif_device_detach(netdev);
565 "failed resubmitting read bulk urb: %d\n", retval);
568 /* Callback handler for write operations
570 * Free allocated buffers, check transmit status and
571 * calculate statistic.
573 static void usb_8dev_write_bulk_callback(struct urb *urb)
575 struct usb_8dev_tx_urb_context *context = urb->context;
576 struct usb_8dev_priv *priv;
577 struct net_device *netdev;
581 priv = context->priv;
582 netdev = priv->netdev;
584 /* free up our allocated buffer */
585 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
586 urb->transfer_buffer, urb->transfer_dma);
588 atomic_dec(&priv->active_tx_urbs);
590 if (!netif_device_present(netdev))
594 netdev_info(netdev, "Tx URB aborted (%d)\n",
597 netdev->stats.tx_packets++;
598 netdev->stats.tx_bytes += context->dlc;
600 can_get_echo_skb(netdev, context->echo_index);
602 can_led_event(netdev, CAN_LED_EVENT_TX);
604 /* Release context */
605 context->echo_index = MAX_TX_URBS;
607 netif_wake_queue(netdev);
610 /* Send data to device */
611 static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
612 struct net_device *netdev)
614 struct usb_8dev_priv *priv = netdev_priv(netdev);
615 struct net_device_stats *stats = &netdev->stats;
616 struct can_frame *cf = (struct can_frame *) skb->data;
617 struct usb_8dev_tx_msg *msg;
619 struct usb_8dev_tx_urb_context *context = NULL;
622 size_t size = sizeof(struct usb_8dev_tx_msg);
624 if (can_dropped_invalid_skb(netdev, skb))
627 /* create a URB, and a buffer for it, and copy the data to the URB */
628 urb = usb_alloc_urb(0, GFP_ATOMIC);
632 buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC,
635 netdev_err(netdev, "No memory left for USB buffer\n");
639 memset(buf, 0, size);
641 msg = (struct usb_8dev_tx_msg *)buf;
642 msg->begin = USB_8DEV_DATA_START;
645 if (cf->can_id & CAN_RTR_FLAG)
646 msg->flags |= USB_8DEV_RTR;
648 if (cf->can_id & CAN_EFF_FLAG)
649 msg->flags |= USB_8DEV_EXTID;
651 msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
652 msg->dlc = cf->can_dlc;
653 memcpy(msg->data, cf->data, cf->can_dlc);
654 msg->end = USB_8DEV_DATA_END;
656 for (i = 0; i < MAX_TX_URBS; i++) {
657 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
658 context = &priv->tx_contexts[i];
663 /* May never happen! When this happens we'd more URBs in flight as
664 * allowed (MAX_TX_URBS).
669 context->priv = priv;
670 context->echo_index = i;
671 context->dlc = cf->can_dlc;
673 usb_fill_bulk_urb(urb, priv->udev,
674 usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX),
675 buf, size, usb_8dev_write_bulk_callback, context);
676 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
677 usb_anchor_urb(urb, &priv->tx_submitted);
679 can_put_echo_skb(skb, netdev, context->echo_index);
681 atomic_inc(&priv->active_tx_urbs);
683 err = usb_submit_urb(urb, GFP_ATOMIC);
686 else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
687 /* Slow down tx path */
688 netif_stop_queue(netdev);
690 /* Release our reference to this URB, the USB core will eventually free
698 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
701 netdev_warn(netdev, "couldn't find free context");
703 return NETDEV_TX_BUSY;
706 can_free_echo_skb(netdev, context->echo_index);
708 usb_unanchor_urb(urb);
709 usb_free_coherent(priv->udev, size, buf, urb->transfer_dma);
711 atomic_dec(&priv->active_tx_urbs);
714 netif_device_detach(netdev);
716 netdev_warn(netdev, "failed tx_urb %d\n", err);
728 static int usb_8dev_get_berr_counter(const struct net_device *netdev,
729 struct can_berr_counter *bec)
731 struct usb_8dev_priv *priv = netdev_priv(netdev);
733 bec->txerr = priv->bec.txerr;
734 bec->rxerr = priv->bec.rxerr;
739 /* Start USB device */
740 static int usb_8dev_start(struct usb_8dev_priv *priv)
742 struct net_device *netdev = priv->netdev;
745 for (i = 0; i < MAX_RX_URBS; i++) {
746 struct urb *urb = NULL;
750 /* create a URB, and a buffer for it */
751 urb = usb_alloc_urb(0, GFP_KERNEL);
757 buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL,
760 netdev_err(netdev, "No memory left for USB buffer\n");
766 urb->transfer_dma = buf_dma;
768 usb_fill_bulk_urb(urb, priv->udev,
769 usb_rcvbulkpipe(priv->udev,
770 USB_8DEV_ENDP_DATA_RX),
772 usb_8dev_read_bulk_callback, priv);
773 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
774 usb_anchor_urb(urb, &priv->rx_submitted);
776 err = usb_submit_urb(urb, GFP_KERNEL);
778 usb_unanchor_urb(urb);
779 usb_free_coherent(priv->udev, RX_BUFFER_SIZE, buf,
785 priv->rxbuf[i] = buf;
786 priv->rxbuf_dma[i] = buf_dma;
788 /* Drop reference, USB core will take care of freeing it */
792 /* Did we submit any URBs */
794 netdev_warn(netdev, "couldn't setup read URBs\n");
798 /* Warn if we've couldn't transmit all the URBs */
800 netdev_warn(netdev, "rx performance may be slow\n");
802 err = usb_8dev_cmd_open(priv);
806 priv->can.state = CAN_STATE_ERROR_ACTIVE;
812 netif_device_detach(priv->netdev);
814 netdev_warn(netdev, "couldn't submit control: %d\n", err);
819 /* Open USB device */
820 static int usb_8dev_open(struct net_device *netdev)
822 struct usb_8dev_priv *priv = netdev_priv(netdev);
826 err = open_candev(netdev);
830 can_led_event(netdev, CAN_LED_EVENT_OPEN);
832 /* finally start device */
833 err = usb_8dev_start(priv);
836 netif_device_detach(priv->netdev);
838 netdev_warn(netdev, "couldn't start device: %d\n",
841 close_candev(netdev);
846 netif_start_queue(netdev);
851 static void unlink_all_urbs(struct usb_8dev_priv *priv)
855 usb_kill_anchored_urbs(&priv->rx_submitted);
857 for (i = 0; i < MAX_RX_URBS; ++i)
858 usb_free_coherent(priv->udev, RX_BUFFER_SIZE,
859 priv->rxbuf[i], priv->rxbuf_dma[i]);
861 usb_kill_anchored_urbs(&priv->tx_submitted);
862 atomic_set(&priv->active_tx_urbs, 0);
864 for (i = 0; i < MAX_TX_URBS; i++)
865 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
868 /* Close USB device */
869 static int usb_8dev_close(struct net_device *netdev)
871 struct usb_8dev_priv *priv = netdev_priv(netdev);
874 /* Send CLOSE command to CAN controller */
875 err = usb_8dev_cmd_close(priv);
877 netdev_warn(netdev, "couldn't stop device");
879 priv->can.state = CAN_STATE_STOPPED;
881 netif_stop_queue(netdev);
884 unlink_all_urbs(priv);
886 close_candev(netdev);
888 can_led_event(netdev, CAN_LED_EVENT_STOP);
893 static const struct net_device_ops usb_8dev_netdev_ops = {
894 .ndo_open = usb_8dev_open,
895 .ndo_stop = usb_8dev_close,
896 .ndo_start_xmit = usb_8dev_start_xmit,
897 .ndo_change_mtu = can_change_mtu,
900 static const struct can_bittiming_const usb_8dev_bittiming_const = {
914 * Check device and firmware.
915 * Set supported modes and bittiming constants.
916 * Allocate some memory.
918 static int usb_8dev_probe(struct usb_interface *intf,
919 const struct usb_device_id *id)
921 struct net_device *netdev;
922 struct usb_8dev_priv *priv;
923 int i, err = -ENOMEM;
926 struct usb_device *usbdev = interface_to_usbdev(intf);
928 /* product id looks strange, better we also check iProduct string */
929 if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
930 sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
931 dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
935 netdev = alloc_candev(sizeof(struct usb_8dev_priv), MAX_TX_URBS);
937 dev_err(&intf->dev, "Couldn't alloc candev\n");
941 priv = netdev_priv(netdev);
944 priv->netdev = netdev;
946 priv->can.state = CAN_STATE_STOPPED;
947 priv->can.clock.freq = USB_8DEV_ABP_CLOCK;
948 priv->can.bittiming_const = &usb_8dev_bittiming_const;
949 priv->can.do_set_mode = usb_8dev_set_mode;
950 priv->can.do_get_berr_counter = usb_8dev_get_berr_counter;
951 priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
952 CAN_CTRLMODE_LISTENONLY |
953 CAN_CTRLMODE_ONE_SHOT;
955 netdev->netdev_ops = &usb_8dev_netdev_ops;
957 netdev->flags |= IFF_ECHO; /* we support local echo */
959 init_usb_anchor(&priv->rx_submitted);
961 init_usb_anchor(&priv->tx_submitted);
962 atomic_set(&priv->active_tx_urbs, 0);
964 for (i = 0; i < MAX_TX_URBS; i++)
965 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
967 priv->cmd_msg_buffer = devm_kzalloc(&intf->dev, sizeof(struct usb_8dev_cmd_msg),
969 if (!priv->cmd_msg_buffer)
972 usb_set_intfdata(intf, priv);
974 SET_NETDEV_DEV(netdev, &intf->dev);
976 mutex_init(&priv->usb_8dev_cmd_lock);
978 err = register_candev(netdev);
981 "couldn't register CAN device: %d\n", err);
985 err = usb_8dev_cmd_version(priv, &version);
987 netdev_err(netdev, "can't get firmware version\n");
988 goto cleanup_unregister_candev;
991 "firmware: %d.%d, hardware: %d.%d\n",
992 (version>>24) & 0xff, (version>>16) & 0xff,
993 (version>>8) & 0xff, version & 0xff);
996 devm_can_led_init(netdev);
1000 cleanup_unregister_candev:
1001 unregister_netdev(priv->netdev);
1004 free_candev(netdev);
1010 /* Called by the usb core when driver is unloaded or device is removed */
1011 static void usb_8dev_disconnect(struct usb_interface *intf)
1013 struct usb_8dev_priv *priv = usb_get_intfdata(intf);
1015 usb_set_intfdata(intf, NULL);
1018 netdev_info(priv->netdev, "device disconnected\n");
1020 unregister_netdev(priv->netdev);
1021 unlink_all_urbs(priv);
1022 free_candev(priv->netdev);
1027 static struct usb_driver usb_8dev_driver = {
1029 .probe = usb_8dev_probe,
1030 .disconnect = usb_8dev_disconnect,
1031 .id_table = usb_8dev_table,
1034 module_usb_driver(usb_8dev_driver);
1036 MODULE_AUTHOR("Bernd Krumboeck <krumboeck@universalnet.at>");
1037 MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces");
1038 MODULE_LICENSE("GPL v2");