--- /dev/null
+/*
+ * CAN driver for PEAK System PCAN-USB adapter
+ * Derived from the PCAN project file driver/src/pcan_usb.c
+ *
+ * Copyright (C) 2003-2010 PEAK System-Technik GmbH
+ * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+#include <linux/module.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+#include "pcan_usb_core.h"
+
+MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB adapter");
+
+/* PCAN-USB Endpoints */
+#define PCAN_USB_EP_CMDOUT 1
+#define PCAN_USB_EP_CMDIN (PCAN_USB_EP_CMDOUT | USB_DIR_IN)
+#define PCAN_USB_EP_MSGOUT 2
+#define PCAN_USB_EP_MSGIN (PCAN_USB_EP_MSGOUT | USB_DIR_IN)
+
+/* PCAN-USB command struct */
+#define PCAN_USB_CMD_FUNC 0
+#define PCAN_USB_CMD_NUM 1
+#define PCAN_USB_CMD_ARGS 2
+#define PCAN_USB_CMD_ARGS_LEN 14
+#define PCAN_USB_CMD_LEN (PCAN_USB_CMD_ARGS + \
+ PCAN_USB_CMD_ARGS_LEN)
+
+/* PCAN-USB command timeout (ms.) */
+#define PCAN_USB_COMMAND_TIMEOUT 1000
+
+/* PCAN-USB startup timeout (ms.) */
+#define PCAN_USB_STARTUP_TIMEOUT 10
+
+/* PCAN-USB rx/tx buffers size */
+#define PCAN_USB_RX_BUFFER_SIZE 64
+#define PCAN_USB_TX_BUFFER_SIZE 64
+
+#define PCAN_USB_MSG_HEADER_LEN 2
+
+/* PCAN-USB adapter internal clock (MHz) */
+#define PCAN_USB_CRYSTAL_HZ 16000000
+
+/* PCAN-USB USB message record status/len field */
+#define PCAN_USB_STATUSLEN_TIMESTAMP (1 << 7)
+#define PCAN_USB_STATUSLEN_INTERNAL (1 << 6)
+#define PCAN_USB_STATUSLEN_EXT_ID (1 << 5)
+#define PCAN_USB_STATUSLEN_RTR (1 << 4)
+#define PCAN_USB_STATUSLEN_DLC (0xf)
+
+/* PCAN-USB error flags */
+#define PCAN_USB_ERROR_TXFULL 0x01
+#define PCAN_USB_ERROR_RXQOVR 0x02
+#define PCAN_USB_ERROR_BUS_LIGHT 0x04
+#define PCAN_USB_ERROR_BUS_HEAVY 0x08
+#define PCAN_USB_ERROR_BUS_OFF 0x10
+#define PCAN_USB_ERROR_RXQEMPTY 0x20
+#define PCAN_USB_ERROR_QOVR 0x40
+#define PCAN_USB_ERROR_TXQFULL 0x80
+
+/* SJA1000 modes */
+#define SJA1000_MODE_NORMAL 0x00
+#define SJA1000_MODE_INIT 0x01
+
+/*
+ * tick duration = 42.666 us =>
+ * (tick_number * 44739243) >> 20 ~ (tick_number * 42666) / 1000
+ * accuracy = 10^-7
+ */
+#define PCAN_USB_TS_DIV_SHIFTER 20
+#define PCAN_USB_TS_US_PER_TICK 44739243
+
+/* PCAN-USB messages record types */
+#define PCAN_USB_REC_ERROR 1
+#define PCAN_USB_REC_ANALOG 2
+#define PCAN_USB_REC_BUSLOAD 3
+#define PCAN_USB_REC_TS 4
+#define PCAN_USB_REC_BUSEVT 5
+
+/* private to PCAN-USB adapter */
+struct pcan_usb {
+ struct peak_usb_device dev;
+ struct peak_time_ref time_ref;
+ struct timer_list restart_timer;
+};
+
+/* incoming message context for decoding */
+struct pcan_usb_msg_context {
+ u16 ts16;
+ u8 prev_ts8;
+ u8 *ptr;
+ u8 *end;
+ u8 rec_cnt;
+ u8 rec_idx;
+ u8 rec_data_idx;
+ struct net_device *netdev;
+ struct pcan_usb *pdev;
+};
+
+/*
+ * send a command
+ */
+static int pcan_usb_send_cmd(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
+{
+ int err;
+ int actual_length;
+
+ /* usb device unregistered? */
+ if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+ return 0;
+
+ dev->cmd_buf[PCAN_USB_CMD_FUNC] = f;
+ dev->cmd_buf[PCAN_USB_CMD_NUM] = n;
+
+ if (p)
+ memcpy(dev->cmd_buf + PCAN_USB_CMD_ARGS,
+ p, PCAN_USB_CMD_ARGS_LEN);
+
+ err = usb_bulk_msg(dev->udev,
+ usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
+ dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
+ PCAN_USB_COMMAND_TIMEOUT);
+ if (err)
+ netdev_err(dev->netdev,
+ "sending cmd f=0x%x n=0x%x failure: %d\n",
+ f, n, err);
+ return err;
+}
+
+/*
+ * send a command then wait for its response
+ */
+static int pcan_usb_wait_rsp(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
+{
+ int err;
+ int actual_length;
+
+ /* usb device unregistered? */
+ if (!(dev->state & PCAN_USB_STATE_CONNECTED))
+ return 0;
+
+ /* first, send command */
+ err = pcan_usb_send_cmd(dev, f, n, NULL);
+ if (err)
+ return err;
+
+ err = usb_bulk_msg(dev->udev,
+ usb_rcvbulkpipe(dev->udev, PCAN_USB_EP_CMDIN),
+ dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
+ PCAN_USB_COMMAND_TIMEOUT);
+ if (err)
+ netdev_err(dev->netdev,
+ "waiting rsp f=0x%x n=0x%x failure: %d\n", f, n, err);
+ else if (p)
+ memcpy(p, dev->cmd_buf + PCAN_USB_CMD_ARGS,
+ PCAN_USB_CMD_ARGS_LEN);
+
+ return err;
+}
+
+static int pcan_usb_set_sja1000(struct peak_usb_device *dev, u8 mode)
+{
+ u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+ [1] = mode,
+ };
+
+ return pcan_usb_send_cmd(dev, 9, 2, args);
+}
+
+static int pcan_usb_set_bus(struct peak_usb_device *dev, u8 onoff)
+{
+ u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+ [0] = !!onoff,
+ };
+
+ return pcan_usb_send_cmd(dev, 3, 2, args);
+}
+
+static int pcan_usb_set_silent(struct peak_usb_device *dev, u8 onoff)
+{
+ u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+ [0] = !!onoff,
+ };
+
+ return pcan_usb_send_cmd(dev, 3, 3, args);
+}
+
+static int pcan_usb_set_ext_vcc(struct peak_usb_device *dev, u8 onoff)
+{
+ u8 args[PCAN_USB_CMD_ARGS_LEN] = {
+ [0] = !!onoff,
+ };
+
+ return pcan_usb_send_cmd(dev, 10, 2, args);
+}
+
+/*
+ * set bittiming value to can
+ */
+static int pcan_usb_set_bittiming(struct peak_usb_device *dev,
+ struct can_bittiming *bt)
+{
+ u8 args[PCAN_USB_CMD_ARGS_LEN];
+ u8 btr0, btr1;
+
+ btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
+ btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
+ (((bt->phase_seg2 - 1) & 0x7) << 4);
+ if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
+ btr1 |= 0x80;
+
+ netdev_info(dev->netdev, "setting BTR0=0x%02x BTR1=0x%02x\n",
+ btr0, btr1);
+
+ args[0] = btr1;
+ args[1] = btr0;
+
+ return pcan_usb_send_cmd(dev, 1, 2, args);
+}
+
+/*
+ * init/reset can
+ */
+static int pcan_usb_write_mode(struct peak_usb_device *dev, u8 onoff)
+{
+ int err;
+
+ err = pcan_usb_set_bus(dev, onoff);
+ if (err)
+ return err;
+
+ if (!onoff) {
+ err = pcan_usb_set_sja1000(dev, SJA1000_MODE_INIT);
+ } else {
+ /* the PCAN-USB needs time to init */
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
+ }
+
+ return err;
+}
+
+/*
+ * handle end of waiting for the device to reset
+ */
+static void pcan_usb_restart(unsigned long arg)
+{
+ /* notify candev and netdev */
+ peak_usb_restart_complete((struct peak_usb_device *)arg);
+}
+
+/*
+ * handle the submission of the restart urb
+ */
+static void pcan_usb_restart_pending(struct urb *urb)
+{
+ struct pcan_usb *pdev = urb->context;
+
+ /* the PCAN-USB needs time to restart */
+ mod_timer(&pdev->restart_timer,
+ jiffies + msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
+
+ /* can delete usb resources */
+ peak_usb_async_complete(urb);
+}
+
+/*
+ * handle asynchronous restart
+ */
+static int pcan_usb_restart_async(struct peak_usb_device *dev, struct urb *urb,
+ u8 *buf)
+{
+ struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
+
+ if (timer_pending(&pdev->restart_timer))
+ return -EBUSY;
+
+ /* set bus on */
+ buf[PCAN_USB_CMD_FUNC] = 3;
+ buf[PCAN_USB_CMD_NUM] = 2;
+ buf[PCAN_USB_CMD_ARGS] = 1;
+
+ usb_fill_bulk_urb(urb, dev->udev,
+ usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
+ buf, PCAN_USB_CMD_LEN,
+ pcan_usb_restart_pending, pdev);
+
+ return usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+/*
+ * read serial number from device
+ */
+static int pcan_usb_get_serial(struct peak_usb_device *dev, u32 *serial_number)
+{
+ u8 args[PCAN_USB_CMD_ARGS_LEN];
+ int err;
+
+ err = pcan_usb_wait_rsp(dev, 6, 1, args);
+ if (err) {
+ netdev_err(dev->netdev, "getting serial failure: %d\n", err);
+ } else if (serial_number) {
+ __le32 tmp32;
+
+ memcpy(&tmp32, args, 4);
+ *serial_number = le32_to_cpu(tmp32);
+ }
+
+ return err;
+}
+
+/*
+ * read device id from device
+ */
+static int pcan_usb_get_device_id(struct peak_usb_device *dev, u32 *device_id)
+{
+ u8 args[PCAN_USB_CMD_ARGS_LEN];
+ int err;
+
+ err = pcan_usb_wait_rsp(dev, 4, 1, args);
+ if (err)
+ netdev_err(dev->netdev, "getting device id failure: %d\n", err);
+ else if (device_id)
+ *device_id = args[0];
+
+ return err;
+}
+
+/*
+ * update current time ref with received timestamp
+ */
+static int pcan_usb_update_ts(struct pcan_usb_msg_context *mc)
+{
+ __le16 tmp16;
+
+ if ((mc->ptr+2) > mc->end)
+ return -EINVAL;
+
+ memcpy(&tmp16, mc->ptr, 2);
+
+ mc->ts16 = le16_to_cpu(tmp16);
+
+ if (mc->rec_idx > 0)
+ peak_usb_update_ts_now(&mc->pdev->time_ref, mc->ts16);
+ else
+ peak_usb_set_ts_now(&mc->pdev->time_ref, mc->ts16);
+
+ return 0;
+}
+
+/*
+ * decode received timestamp
+ */
+static int pcan_usb_decode_ts(struct pcan_usb_msg_context *mc, u8 first_packet)
+{
+ /* only 1st packet supplies a word timestamp */
+ if (first_packet) {
+ __le16 tmp16;
+
+ if ((mc->ptr + 2) > mc->end)
+ return -EINVAL;
+
+ memcpy(&tmp16, mc->ptr, 2);
+ mc->ptr += 2;
+
+ mc->ts16 = le16_to_cpu(tmp16);
+ mc->prev_ts8 = mc->ts16 & 0x00ff;
+ } else {
+ u8 ts8;
+
+ if ((mc->ptr + 1) > mc->end)
+ return -EINVAL;
+
+ ts8 = *mc->ptr++;
+
+ if (ts8 < mc->prev_ts8)
+ mc->ts16 += 0x100;
+
+ mc->ts16 &= 0xff00;
+ mc->ts16 |= ts8;
+ mc->prev_ts8 = ts8;
+ }
+
+ return 0;
+}
+
+static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
+ u8 status_len)
+{
+ struct sk_buff *skb;
+ struct can_frame *cf;
+ struct timeval tv;
+ enum can_state new_state;
+
+ /* ignore this error until 1st ts received */
+ if (n == PCAN_USB_ERROR_QOVR)
+ if (!mc->pdev->time_ref.tick_count)
+ return 0;
+
+ new_state = mc->pdev->dev.can.state;
+
+ switch (mc->pdev->dev.can.state) {
+ case CAN_STATE_ERROR_ACTIVE:
+ if (n & PCAN_USB_ERROR_BUS_LIGHT) {
+ new_state = CAN_STATE_ERROR_WARNING;
+ break;
+ }
+
+ case CAN_STATE_ERROR_WARNING:
+ if (n & PCAN_USB_ERROR_BUS_HEAVY) {
+ new_state = CAN_STATE_ERROR_PASSIVE;
+ break;
+ }
+ if (n & PCAN_USB_ERROR_BUS_OFF) {
+ new_state = CAN_STATE_BUS_OFF;
+ break;
+ }
+ if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) {
+ /*
+ * trick to bypass next comparison and process other
+ * errors
+ */
+ new_state = CAN_STATE_MAX;
+ break;
+ }
+ if ((n & PCAN_USB_ERROR_BUS_LIGHT) == 0) {
+ /* no error (back to active state) */
+ mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE;
+ return 0;
+ }
+ break;
+
+ case CAN_STATE_ERROR_PASSIVE:
+ if (n & PCAN_USB_ERROR_BUS_OFF) {
+ new_state = CAN_STATE_BUS_OFF;
+ break;
+ }
+ if (n & PCAN_USB_ERROR_BUS_LIGHT) {
+ new_state = CAN_STATE_ERROR_WARNING;
+ break;
+ }
+ if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) {
+ /*
+ * trick to bypass next comparison and process other
+ * errors
+ */
+ new_state = CAN_STATE_MAX;
+ break;
+ }
+
+ if ((n & PCAN_USB_ERROR_BUS_HEAVY) == 0) {
+ /* no error (back to active state) */
+ mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE;
+ return 0;
+ }
+ break;
+
+ default:
+ /* do nothing waiting for restart */
+ return 0;
+ }
+
+ /* donot post any error if current state didn't change */
+ if (mc->pdev->dev.can.state == new_state)
+ return 0;
+
+ /* allocate an skb to store the error frame */
+ skb = alloc_can_err_skb(mc->netdev, &cf);
+ if (!skb)
+ return -ENOMEM;
+
+ switch (new_state) {
+ case CAN_STATE_BUS_OFF:
+ cf->can_id |= CAN_ERR_BUSOFF;
+ mc->pdev->dev.can.can_stats.bus_off++;
+ can_bus_off(mc->netdev);
+ break;
+
+ case CAN_STATE_ERROR_PASSIVE:
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE |
+ CAN_ERR_CRTL_RX_PASSIVE;
+ mc->pdev->dev.can.can_stats.error_passive++;
+ break;
+
+ case CAN_STATE_ERROR_WARNING:
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] |= CAN_ERR_CRTL_TX_WARNING |
+ CAN_ERR_CRTL_RX_WARNING;
+ mc->pdev->dev.can.can_stats.error_warning++;
+ break;
+
+ default:
+ /* CAN_STATE_MAX (trick to handle other errors) */
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
+ mc->netdev->stats.rx_over_errors++;
+ mc->netdev->stats.rx_errors++;
+
+ new_state = mc->pdev->dev.can.state;
+ break;
+ }
+
+ mc->pdev->dev.can.state = new_state;
+
+ if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
+ struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
+
+ peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
+ hwts->hwtstamp = timeval_to_ktime(tv);
+ }
+
+ netif_rx(skb);
+ mc->netdev->stats.rx_packets++;
+ mc->netdev->stats.rx_bytes += cf->can_dlc;
+
+ return 0;
+}
+
+/*
+ * decode non-data usb message
+ */
+static int pcan_usb_decode_status(struct pcan_usb_msg_context *mc,
+ u8 status_len)
+{
+ u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
+ u8 f, n;
+ int err;
+
+ /* check whether function and number can be read */
+ if ((mc->ptr + 2) > mc->end)
+ return -EINVAL;
+
+ f = mc->ptr[PCAN_USB_CMD_FUNC];
+ n = mc->ptr[PCAN_USB_CMD_NUM];
+ mc->ptr += PCAN_USB_CMD_ARGS;
+
+ if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
+ int err = pcan_usb_decode_ts(mc, !mc->rec_idx);
+
+ if (err)
+ return err;
+ }
+
+ switch (f) {
+ case PCAN_USB_REC_ERROR:
+ err = pcan_usb_decode_error(mc, n, status_len);
+ if (err)
+ return err;
+ break;
+
+ case PCAN_USB_REC_ANALOG:
+ /* analog values (ignored) */
+ rec_len = 2;
+ break;
+
+ case PCAN_USB_REC_BUSLOAD:
+ /* bus load (ignored) */
+ rec_len = 1;
+ break;
+
+ case PCAN_USB_REC_TS:
+ /* only timestamp */
+ if (pcan_usb_update_ts(mc))
+ return -EINVAL;
+ break;
+
+ case PCAN_USB_REC_BUSEVT:
+ /* error frame/bus event */
+ if (n & PCAN_USB_ERROR_TXQFULL)
+ netdev_dbg(mc->netdev, "device Tx queue full)\n");
+ break;
+ default:
+ netdev_err(mc->netdev, "unexpected function %u\n", f);
+ break;
+ }
+
+ if ((mc->ptr + rec_len) > mc->end)
+ return -EINVAL;
+
+ mc->ptr += rec_len;
+
+ return 0;
+}
+
+/*
+ * decode data usb message
+ */
+static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
+{
+ u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
+ struct sk_buff *skb;
+ struct can_frame *cf;
+ struct timeval tv;
+ struct skb_shared_hwtstamps *hwts;
+
+ skb = alloc_can_skb(mc->netdev, &cf);
+ if (!skb)
+ return -ENOMEM;
+
+ if (status_len & PCAN_USB_STATUSLEN_EXT_ID) {
+ __le32 tmp32;
+
+ if ((mc->ptr + 4) > mc->end)
+ goto decode_failed;
+
+ memcpy(&tmp32, mc->ptr, 4);
+ mc->ptr += 4;
+
+ cf->can_id = (le32_to_cpu(tmp32) >> 3) | CAN_EFF_FLAG;
+ } else {
+ __le16 tmp16;
+
+ if ((mc->ptr + 2) > mc->end)
+ goto decode_failed;
+
+ memcpy(&tmp16, mc->ptr, 2);
+ mc->ptr += 2;
+
+ cf->can_id = le16_to_cpu(tmp16) >> 5;
+ }
+
+ cf->can_dlc = get_can_dlc(rec_len);
+
+ /* first data packet timestamp is a word */
+ if (pcan_usb_decode_ts(mc, !mc->rec_data_idx))
+ goto decode_failed;
+
+ /* read data */
+ memset(cf->data, 0x0, sizeof(cf->data));
+ if (status_len & PCAN_USB_STATUSLEN_RTR) {
+ cf->can_id |= CAN_RTR_FLAG;
+ } else {
+ if ((mc->ptr + rec_len) > mc->end)
+ goto decode_failed;
+
+ memcpy(cf->data, mc->ptr, cf->can_dlc);
+ mc->ptr += rec_len;
+ }
+
+ /* convert timestamp into kernel time */
+ peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
+ hwts = skb_hwtstamps(skb);
+ hwts->hwtstamp = timeval_to_ktime(tv);
+
+ /* push the skb */
+ netif_rx(skb);
+
+ /* update statistics */
+ mc->netdev->stats.rx_packets++;
+ mc->netdev->stats.rx_bytes += cf->can_dlc;
+
+ return 0;
+
+decode_failed:
+ dev_kfree_skb(skb);
+ return -EINVAL;
+}
+
+/*
+ * process incoming message
+ */
+static int pcan_usb_decode_msg(struct peak_usb_device *dev, u8 *ibuf, u32 lbuf)
+{
+ struct pcan_usb_msg_context mc = {
+ .rec_cnt = ibuf[1],
+ .ptr = ibuf + PCAN_USB_MSG_HEADER_LEN,
+ .end = ibuf + lbuf,
+ .netdev = dev->netdev,
+ .pdev = container_of(dev, struct pcan_usb, dev),
+ };
+ int err;
+
+ for (err = 0; mc.rec_idx < mc.rec_cnt && !err; mc.rec_idx++) {
+ u8 sl = *mc.ptr++;
+
+ /* handle status and error frames here */
+ if (sl & PCAN_USB_STATUSLEN_INTERNAL) {
+ err = pcan_usb_decode_status(&mc, sl);
+ /* handle normal can frames here */
+ } else {
+ err = pcan_usb_decode_data(&mc, sl);
+ mc.rec_data_idx++;
+ }
+ }
+
+ return err;
+}
+
+/*
+ * process any incoming buffer
+ */
+static int pcan_usb_decode_buf(struct peak_usb_device *dev, struct urb *urb)
+{
+ int err = 0;
+
+ if (urb->actual_length > PCAN_USB_MSG_HEADER_LEN) {
+ err = pcan_usb_decode_msg(dev, urb->transfer_buffer,
+ urb->actual_length);
+
+ } else if (urb->actual_length > 0) {
+ netdev_err(dev->netdev, "usb message length error (%u)\n",
+ urb->actual_length);
+ err = -EINVAL;
+ }
+
+ return err;
+}
+
+/*
+ * process outgoing packet
+ */
+static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
+ u8 *obuf, size_t *size)
+{
+ struct net_device *netdev = dev->netdev;
+ struct net_device_stats *stats = &netdev->stats;
+ struct can_frame *cf = (struct can_frame *)skb->data;
+ u8 *pc;
+
+ obuf[0] = 2;
+ obuf[1] = 1;
+
+ pc = obuf + PCAN_USB_MSG_HEADER_LEN;
+
+ /* status/len byte */
+ *pc = cf->can_dlc;
+ if (cf->can_id & CAN_RTR_FLAG)
+ *pc |= PCAN_USB_STATUSLEN_RTR;
+
+ /* can id */
+ if (cf->can_id & CAN_EFF_FLAG) {
+ __le32 tmp32 = cpu_to_le32((cf->can_id & CAN_ERR_MASK) << 3);
+
+ *pc |= PCAN_USB_STATUSLEN_EXT_ID;
+ memcpy(++pc, &tmp32, 4);
+ pc += 4;
+ } else {
+ __le16 tmp16 = cpu_to_le16((cf->can_id & CAN_ERR_MASK) << 5);
+
+ memcpy(++pc, &tmp16, 2);
+ pc += 2;
+ }
+
+ /* can data */
+ if (!(cf->can_id & CAN_RTR_FLAG)) {
+ memcpy(pc, cf->data, cf->can_dlc);
+ pc += cf->can_dlc;
+ }
+
+ obuf[(*size)-1] = (u8)(stats->tx_packets & 0xff);
+
+ return 0;
+}
+
+/*
+ * start interface
+ */
+static int pcan_usb_start(struct peak_usb_device *dev)
+{
+ struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
+
+ /* number of bits used in timestamps read from adapter struct */
+ peak_usb_init_time_ref(&pdev->time_ref, &pcan_usb);
+
+ /* if revision greater than 3, can put silent mode on/off */
+ if (dev->device_rev > 3) {
+ int err;
+
+ err = pcan_usb_set_silent(dev,
+ dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
+ if (err)
+ return err;
+ }
+
+ return pcan_usb_set_ext_vcc(dev, 0);
+}
+
+static int pcan_usb_init(struct peak_usb_device *dev)
+{
+ struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
+ u32 serial_number;
+ int err;
+
+ /* initialize a timer needed to wait for hardware restart */
+ init_timer(&pdev->restart_timer);
+ pdev->restart_timer.function = pcan_usb_restart;
+ pdev->restart_timer.data = (unsigned long)dev;
+
+ /*
+ * explicit use of dev_xxx() instead of netdev_xxx() here:
+ * information displayed are related to the device itself, not
+ * to the canx netdevice.
+ */
+ err = pcan_usb_get_serial(dev, &serial_number);
+ if (err) {
+ dev_err(dev->netdev->dev.parent,
+ "unable to read %s serial number (err %d)\n",
+ pcan_usb.name, err);
+ return err;
+ }
+
+ dev_info(dev->netdev->dev.parent,
+ "PEAK-System %s adapter hwrev %u serial %08X (%u channel)\n",
+ pcan_usb.name, dev->device_rev, serial_number,
+ pcan_usb.ctrl_count);
+
+ return 0;
+}
+
+/*
+ * probe function for new PCAN-USB usb interface
+ */
+static int pcan_usb_probe(struct usb_interface *intf)
+{
+ struct usb_host_interface *if_desc;
+ int i;
+
+ if_desc = intf->altsetting;
+
+ /* check interface endpoint addresses */
+ for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
+ struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
+
+ switch (ep->bEndpointAddress) {
+ case PCAN_USB_EP_CMDOUT:
+ case PCAN_USB_EP_CMDIN:
+ case PCAN_USB_EP_MSGOUT:
+ case PCAN_USB_EP_MSGIN:
+ break;
+ default:
+ return -ENODEV;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * describe the PCAN-USB adapter
+ */
+const struct peak_usb_adapter pcan_usb = {
+ .name = "PCAN-USB",
+ .device_id = PCAN_USB_PRODUCT_ID,
+ .ctrl_count = 1,
+ .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
+ .clock = {
+ .freq = PCAN_USB_CRYSTAL_HZ / 2 ,
+ },
+ .bittiming_const = {
+ .name = "pcan_usb",
+ .tseg1_min = 1,
+ .tseg1_max = 16,
+ .tseg2_min = 1,
+ .tseg2_max = 8,
+ .sjw_max = 4,
+ .brp_min = 1,
+ .brp_max = 64,
+ .brp_inc = 1,
+ },
+
+ /* size of device private data */
+ .sizeof_dev_private = sizeof(struct pcan_usb),
+
+ /* timestamps usage */
+ .ts_used_bits = 16,
+ .ts_period = 24575, /* calibration period in ts. */
+ .us_per_ts_scale = PCAN_USB_TS_US_PER_TICK, /* us=(ts*scale) */
+ .us_per_ts_shift = PCAN_USB_TS_DIV_SHIFTER, /* >> shift */
+
+ /* give here messages in/out endpoints */
+ .ep_msg_in = PCAN_USB_EP_MSGIN,
+ .ep_msg_out = {PCAN_USB_EP_MSGOUT},
+
+ /* size of rx/tx usb buffers */
+ .rx_buffer_size = PCAN_USB_RX_BUFFER_SIZE,
+ .tx_buffer_size = PCAN_USB_TX_BUFFER_SIZE,
+
+ /* device callbacks */
+ .intf_probe = pcan_usb_probe,
+ .dev_init = pcan_usb_init,
+ .dev_set_bus = pcan_usb_write_mode,
+ .dev_set_bittiming = pcan_usb_set_bittiming,
+ .dev_get_device_id = pcan_usb_get_device_id,
+ .dev_decode_buf = pcan_usb_decode_buf,
+ .dev_encode_msg = pcan_usb_encode_msg,
+ .dev_start = pcan_usb_start,
+ .dev_restart_async = pcan_usb_restart_async,
+};
Code Review / kvmfornfv.git / blobdiff