Add device driver for USB2CAN interface from "8 devices"
(http://www.8devices.com).
Signed-off-by: Bernd Krumboeck <krumbo...@universalnet.at>
---
drivers/net/can/usb/Kconfig | 6 +
drivers/net/can/usb/Makefile | 1 +
drivers/net/can/usb/usb_8dev.c | 1098 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1105 insertions(+)
create mode 100644 drivers/net/can/usb/usb_8dev.c
diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig
index a4e4bee..2162233 100644
--- a/drivers/net/can/usb/Kconfig
+++ b/drivers/net/can/usb/Kconfig
@@ -48,4 +48,10 @@ config CAN_PEAK_USB
This driver supports the PCAN-USB and PCAN-USB Pro adapters
from PEAK-System Technik (http://www.peak-system.com).
+config CAN_8DEV_USB
+ tristate "8 devices USB2CAN interface"
+ ---help---
+ This driver supports the USB2CAN interface
+ from 8 devices (http://www.8devices.com).
+
endmenu
diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile
index 80a2ee4..becef46 100644
--- a/drivers/net/can/usb/Makefile
+++ b/drivers/net/can/usb/Makefile
@@ -6,5 +6,6 @@ obj-$(CONFIG_CAN_EMS_USB) += ems_usb.o
obj-$(CONFIG_CAN_ESD_USB2) += esd_usb2.o
obj-$(CONFIG_CAN_KVASER_USB) += kvaser_usb.o
obj-$(CONFIG_CAN_PEAK_USB) += peak_usb/
+obj-$(CONFIG_CAN_8DEV_USB) += usb_8dev.o
ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
diff --git a/drivers/net/can/usb/usb_8dev.c b/drivers/net/can/usb/usb_8dev.c
new file mode 100644
index 0000000..345ce6e
--- /dev/null
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -0,0 +1,1098 @@
+/*
+ * CAN driver for UAB "8 devices" USB2CAN converter
+ *
+ * Copyright (C) 2012 Bernd Krumboeck (krumbo...@universalnet.at)
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * This driver is inspired by the 3.2.0 version of
drivers/net/can/usb/ems_usb.c
+ * and drivers/net/can/usb/esd_usb2.c
+ *
+ * Many thanks to Gerhard Bertelsmann (i...@gerhard-bertelsmann.de)
+ * for testing and fixing this driver. Also many thanks to "8 devices",
+ * who were very cooperative and answered my questions.
+ */
+
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include <linux/can/error.h>
+
+/* driver constants */
+#define MAX_RX_URBS 10
+#define MAX_TX_URBS 10
+#define RX_BUFFER_SIZE 64
+
+/* vendor and product id */
+#define USB_8DEV_VENDOR_ID 0x0483
+#define USB_8DEV_PRODUCT_ID 0x1234
+
+/* bittiming constants */
+#define USB_8DEV_ABP_CLOCK 32000000
+#define USB_8DEV_BAUD_MANUAL 0x09
+#define USB_8DEV_TSEG1_MIN 1
+#define USB_8DEV_TSEG1_MAX 16
+#define USB_8DEV_TSEG2_MIN 1
+#define USB_8DEV_TSEG2_MAX 8
+#define USB_8DEV_SJW_MAX 4
+#define USB_8DEV_BRP_MIN 1
+#define USB_8DEV_BRP_MAX 1024
+#define USB_8DEV_BRP_INC 1
+
+/* setup flags */
+#define USB_8DEV_SILENT 0x01
+#define USB_8DEV_LOOPBACK 0x02
+#define USB_8DEV_DISABLE_AUTO_RESTRANS 0x04
+#define USB_8DEV_STATUS_FRAME 0x08
+
+/* commands */
+enum usb_8dev_cmd {
+ USB_8DEV_RESET = 1,
+ USB_8DEV_OPEN,
+ USB_8DEV_CLOSE,
+ USB_8DEV_SET_SPEED,
+ USB_8DEV_SET_MASK_FILTER,
+ USB_8DEV_GET_STATUS,
+ USB_8DEV_GET_STATISTICS,
+ USB_8DEV_GET_SERIAL,
+ USB_8DEV_GET_SOFTW_VER,
+ USB_8DEV_GET_HARDW_VER,
+ USB_8DEV_RESET_TIMESTAMP,
+ USB_8DEV_GET_SOFTW_HARDW_VER
+};
+
+#define USB_8DEV_CMD_START 0x11
+#define USB_8DEV_CMD_END 0x22
+
+#define USB_8DEV_CMD_SUCCESS 0
+#define USB_8DEV_CMD_ERROR 255
+
+/* frames */
+#define USB_8DEV_DATA_START 0x55
+#define USB_8DEV_DATA_END 0xAA
+
+#define USB_8DEV_TYPE_CAN_FRAME 0
+#define USB_8DEV_TYPE_ERROR_FRAME 3
+
+#define USB_8DEV_EXTID 0x01
+#define USB_8DEV_RTR 0x02
+#define USB_8DEV_ERR_FLAG 0x04
+
+/* status */
+#define USB_8DEV_STATUSMSG_OK 0x00 /* Normal condition. */
+#define USB_8DEV_STATUSMSG_OVERRUN 0x01 /* Overrun occured when sending */
+#define USB_8DEV_STATUSMSG_BUSLIGHT 0x02 /* Error counter has reached 96 */
+#define USB_8DEV_STATUSMSG_BUSHEAVY 0x03 /* Error count. has reached 128 */
+#define USB_8DEV_STATUSMSG_BUSOFF 0x04 /* Device is in BUSOFF */
+#define USB_8DEV_STATUSMSG_STUFF 0x20 /* Stuff Error */
+#define USB_8DEV_STATUSMSG_FORM 0x21 /* Form Error */
+#define USB_8DEV_STATUSMSG_ACK 0x23 /* Ack Error */
+#define USB_8DEV_STATUSMSG_BIT0 0x24 /* Bit1 Error */
+#define USB_8DEV_STATUSMSG_BIT1 0x25 /* Bit0 Error */
+#define USB_8DEV_STATUSMSG_CRC 0x26 /* CRC Error */
+
+#define USB_8DEV_RP_MASK 0x7F /* Mask for Receive Error Bit */
+
+
+/* table of devices that work with this driver */
+static struct usb_device_id usb_8dev_table[] = {
+ { USB_DEVICE(USB_8DEV_VENDOR_ID, USB_8DEV_PRODUCT_ID) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, usb_8dev_table);
+
+struct usb_8dev_tx_urb_context {
+ struct usb_8dev *dev;
+
+ u32 echo_index;
+ u8 dlc;
+};
+
+/* Structure to hold all of our device specific stuff */
+struct usb_8dev {
+ struct can_priv can; /* must be the first member */
+
+ struct sk_buff *echo_skb[MAX_TX_URBS];
+
+ struct usb_device *udev;
+ struct net_device *netdev;
+
+ atomic_t active_tx_urbs;
+ struct usb_anchor tx_submitted;
+ struct usb_8dev_tx_urb_context tx_contexts[MAX_TX_URBS];
+
+ struct usb_anchor rx_submitted;
+
+ struct can_berr_counter bec;
+
+ u8 *cmd_msg_buffer;
+
+ unsigned int free_slots; /* remember number of available slots */
+
+ struct mutex usb_8dev_cmd_lock;
+
+};
+
+/* tx frame */
+struct __packed usb_8dev_tx_msg {
+ u8 begin;
+ u8 flags; /* RTR and EXT_ID flag */
+ __be32 id; /* upper 3 bits not used */
+ u8 dlc; /* data length code 0-8 bytes */
+ u8 data[8]; /* 64-bit data */
+ u8 end;
+};
+
+/* rx frame */
+struct __packed usb_8dev_rx_msg {
+ u8 begin;
+ u8 type; /* frame type */
+ u8 flags; /* RTR and EXT_ID flag */
+ __be32 id; /* upper 3 bits not used */
+ u8 dlc; /* data length code 0-8 bytes */
+ u8 data[8]; /* 64-bit data */
+ __be32 timestamp; /* 32-bit timestamp */
+ u8 end;
+};
+
+/* command frame */
+struct __packed usb_8dev_cmd_msg {
+ u8 begin;
+ u8 channel; /* unkown - always 0 */
+ u8 command; /* command to execute */
+ u8 opt1; /* optional parameter / return value */
+ u8 opt2; /* optional parameter 2 */
+ u8 data[10]; /* optional parameter and data */
+ u8 end;
+};
+
+static struct usb_driver usb_8dev_driver;
+
+static int usb_8dev_send_cmd_msg(struct usb_8dev *dev, u8 *msg, int size)
+{
+ int actual_length;
+
+ return usb_bulk_msg(dev->udev, usb_sndbulkpipe(dev->udev, 4),
+ msg, size, &actual_length, 1000);
+}
+
+static int usb_8dev_wait_cmd_msg(struct usb_8dev *dev, u8 *msg, int size,
+ int *actual_length)
+{
+ return usb_bulk_msg(dev->udev, usb_rcvbulkpipe(dev->udev, 3),
+ msg, size, actual_length, 1000);
+}
+
+/*
+ * Send command to device and receive result.
+ * Command was successful when opt1 = 0.
+ */
+static int usb_8dev_send_cmd(struct usb_8dev *dev, struct usb_8dev_cmd_msg
*out,
+ struct usb_8dev_cmd_msg *in)
+{
+ int err;
+ int num_bytes_read;
+ struct net_device *netdev;
+
+ netdev = dev->netdev;
+
+ out->begin = USB_8DEV_CMD_START;
+ out->end = USB_8DEV_CMD_END;
+
+ memcpy(&dev->cmd_msg_buffer[0], out,
+ sizeof(struct usb_8dev_cmd_msg));
+
+ mutex_lock(&dev->usb_8dev_cmd_lock);
+
+ err = usb_8dev_send_cmd_msg(dev, &dev->cmd_msg_buffer[0],
+ sizeof(struct usb_8dev_cmd_msg));
+ if (err < 0) {
+ dev_err(netdev->dev.parent, "sending command message failed\n");
+ return err;
+ }
+
+ err = usb_8dev_wait_cmd_msg(dev, &dev->cmd_msg_buffer[0],
+ sizeof(struct usb_8dev_cmd_msg),
+ &num_bytes_read);
+ if (err < 0) {
+ dev_err(netdev->dev.parent, "no command message answer\n");
+ return err;
+ }
+
+ mutex_unlock(&dev->usb_8dev_cmd_lock);
+
+ memcpy(in, &dev->cmd_msg_buffer[0], sizeof(struct usb_8dev_cmd_msg));
+
+ if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END ||
+ num_bytes_read != 16 || in->opt1 != 0)
+ return -EPROTO;
+
+ return 0;
+}
+
+/* Send open command to device */
+static int usb_8dev_cmd_open(struct usb_8dev *dev)
+{
+ struct can_bittiming *bt = &dev->can.bittiming;
+ struct usb_8dev_cmd_msg outmsg;
+ struct usb_8dev_cmd_msg inmsg;
+ u32 flags = 0;
+ u32 beflags;
+ u16 bebrp;
+ u32 ctrlmode = dev->can.ctrlmode;
+
+ if (ctrlmode & CAN_CTRLMODE_LOOPBACK)
+ flags |= USB_8DEV_LOOPBACK;
+ if (ctrlmode & CAN_CTRLMODE_LISTENONLY)
+ flags |= USB_8DEV_SILENT;
+ if (ctrlmode & CAN_CTRLMODE_ONE_SHOT)
+ flags |= USB_8DEV_DISABLE_AUTO_RESTRANS;
+
+ flags |= USB_8DEV_STATUS_FRAME;
+
+ memset(&outmsg, 0, sizeof(struct usb_8dev_cmd_msg));
+ outmsg.command = USB_8DEV_OPEN;
+ outmsg.opt1 = USB_8DEV_BAUD_MANUAL;
+ outmsg.data[0] = (bt->prop_seg + bt->phase_seg1);
+ outmsg.data[1] = bt->phase_seg2;
+ outmsg.data[2] = bt->sjw;
+
+ /* BRP */
+ bebrp = cpu_to_be16((u16) bt->brp);
+ memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp));
+
+ /* flags */
+ beflags = cpu_to_be32(flags);
+ memcpy(&outmsg.data[5], &beflags, sizeof(beflags));
+
+ return usb_8dev_send_cmd(dev, &outmsg, &inmsg);
+}
+
+/* Send close command to device */
+static int usb_8dev_cmd_close(struct usb_8dev *dev)
+{
+ struct usb_8dev_cmd_msg outmsg;
+ struct usb_8dev_cmd_msg inmsg;
+
+ memset(&outmsg, 0, sizeof(struct usb_8dev_cmd_msg));
+ outmsg.command = USB_8DEV_CLOSE;
+
+ return usb_8dev_send_cmd(dev, &outmsg, &inmsg);
+}
+
+/* Get firmware and hardware version */
+static int usb_8dev_cmd_version(struct usb_8dev *dev, u32 *res)
+{
+ struct usb_8dev_cmd_msg outmsg;
+ struct usb_8dev_cmd_msg inmsg;
+ int err = 0;
+
+ memset(&outmsg, 0, sizeof(struct usb_8dev_cmd_msg));
+ outmsg.command = USB_8DEV_GET_SOFTW_HARDW_VER;
+
+ err = usb_8dev_send_cmd(dev, &outmsg, &inmsg);
+ if (err)
+ return err;
+
+ *res = be32_to_cpu(*(u32 *)inmsg.data);
+
+ return err;
+}
+
+/* Get firmware version */
+static ssize_t show_firmware(struct device *d, struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_8dev_cmd_msg outmsg;
+ struct usb_8dev_cmd_msg inmsg;
+ int err = 0;
+ u16 result;
+ struct usb_interface *intf = to_usb_interface(d);
+ struct usb_8dev *dev = usb_get_intfdata(intf);
+
+ memset(&outmsg, 0, sizeof(struct usb_8dev_cmd_msg));
+ outmsg.command = USB_8DEV_GET_SOFTW_VER;
+
+ err = usb_8dev_send_cmd(dev, &outmsg, &inmsg);
+ if (err)
+ return -EIO;
+
+ result = be16_to_cpu(*(u16 *)inmsg.data);
+
+ return sprintf(buf, "%d.%d\n", (u8)(result>>8), (u8)result);
+}
+
+/* Get hardware version */
+static ssize_t show_hardware(struct device *d, struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_8dev_cmd_msg outmsg;
+ struct usb_8dev_cmd_msg inmsg;
+ int err = 0;
+ u16 result;
+ struct usb_interface *intf = to_usb_interface(d);
+ struct usb_8dev *dev = usb_get_intfdata(intf);
+
+ memset(&outmsg, 0, sizeof(struct usb_8dev_cmd_msg));
+ outmsg.command = USB_8DEV_GET_HARDW_VER;
+
+ err = usb_8dev_send_cmd(dev, &outmsg, &inmsg);
+ if (err)
+ return -EIO;
+
+ result = be16_to_cpu(*(u16 *)inmsg.data);
+
+ return sprintf(buf, "%d.%d\n", (u8)(result>>8), (u8)result);
+}
+
+static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
+static DEVICE_ATTR(hardware, S_IRUGO, show_hardware, NULL);
+
+/*
+ * Set network device mode
+ *
+ * Maybe we should leave this function empty, because the device
+ * set mode variable with open command.
+ */
+static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode)
+{
+ struct usb_8dev *dev = netdev_priv(netdev);
+ int err = 0;
+
+ switch (mode) {
+ case CAN_MODE_START:
+ err = usb_8dev_cmd_open(dev);
+ if (err)
+ dev_warn(netdev->dev.parent, "couldn't start device");
+
+ if (netif_queue_stopped(netdev))
+ netif_wake_queue(netdev);
+ break;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
+/*
+ * Empty function: We set bittiming when we start the interface.
+ * This is a firmware limitation.
+ */
+static int usb_8dev_set_bittiming(struct net_device *netdev)
+{
+ return 0;
+}
+
+/* Read data and status frames */
+static void usb_8dev_rx_can_msg(struct usb_8dev *dev,
+ struct usb_8dev_rx_msg *msg)
+{
+ struct can_frame *cf;
+ struct sk_buff *skb;
+ int i;
+ struct net_device_stats *stats = &dev->netdev->stats;
+
+ if (msg->type == USB_8DEV_TYPE_CAN_FRAME) {
+ skb = alloc_can_skb(dev->netdev, &cf);
+ if (!skb)
+ return;
+
+ cf->can_id = be32_to_cpu(msg->id);
+ cf->can_dlc = get_can_dlc(msg->dlc & 0xF);
+
+ if (msg->flags & USB_8DEV_EXTID)
+ cf->can_id |= CAN_EFF_FLAG;
+
+ if (msg->flags & USB_8DEV_RTR)
+ cf->can_id |= CAN_RTR_FLAG;
+ else
+ for (i = 0; i < cf->can_dlc; i++)
+ cf->data[i] = msg->data[i];
+ } else if (msg->type == USB_8DEV_TYPE_ERROR_FRAME &&
+ msg->flags == USB_8DEV_ERR_FLAG) {
+
+ /*
+ * Error message:
+ * byte 0: Status
+ * byte 1: bit 7: Receive Passive
+ * byte 1: bit 0-6: Receive Error Counter
+ * byte 2: Transmit Error Counter
+ * byte 3: Always 0 (maybe reserved for future use)
+ */
+
+ u8 state = msg->data[0];
+ u8 rxerr = msg->data[1] & USB_8DEV_RP_MASK;
+ u8 txerr = msg->data[2];
+ int rx_errors = 0;
+ int tx_errors = 0;
+
+ skb = alloc_can_err_skb(dev->netdev, &cf);
+ if (!skb)
+ return;
+
+ dev->can.can_stats.bus_error++;
+
+ switch (state) {
+ case USB_8DEV_STATUSMSG_OK:
+ dev->can.state = CAN_STATE_ERROR_ACTIVE;
+ cf->can_id |= CAN_ERR_PROT;
+ cf->data[2] = CAN_ERR_PROT_ACTIVE;
+ break;
+ case USB_8DEV_STATUSMSG_BUSOFF:
+ dev->can.state = CAN_STATE_BUS_OFF;
+ cf->can_id |= CAN_ERR_BUSOFF;
+ can_bus_off(dev->netdev);
+ break;
+ default:
+ dev->can.state = CAN_STATE_ERROR_WARNING;
+ cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
+ break;
+ }
+
+ switch (state) {
+ case USB_8DEV_STATUSMSG_ACK:
+ cf->can_id |= CAN_ERR_ACK;
+ tx_errors = 1;
+ break;
+ case USB_8DEV_STATUSMSG_CRC:
+ cf->data[2] |= CAN_ERR_PROT_BIT;
+ rx_errors = 1;
+ break;
+ case USB_8DEV_STATUSMSG_BIT0:
+ cf->data[2] |= CAN_ERR_PROT_BIT0;
+ tx_errors = 1;
+ break;
+ case USB_8DEV_STATUSMSG_BIT1:
+ cf->data[2] |= CAN_ERR_PROT_BIT1;
+ tx_errors = 1;
+ break;
+ case USB_8DEV_STATUSMSG_FORM:
+ cf->data[2] |= CAN_ERR_PROT_FORM;
+ rx_errors = 1;
+ break;
+ case USB_8DEV_STATUSMSG_STUFF:
+ cf->data[2] |= CAN_ERR_PROT_STUFF;
+ rx_errors = 1;
+ break;
+ case USB_8DEV_STATUSMSG_OVERRUN:
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = (txerr > rxerr) ?
+ CAN_ERR_CRTL_TX_OVERFLOW :
+ CAN_ERR_CRTL_RX_OVERFLOW;
+ cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
+ stats->rx_over_errors++;
+ break;
+ case USB_8DEV_STATUSMSG_BUSLIGHT:
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = (txerr > rxerr) ?
+ CAN_ERR_CRTL_TX_WARNING :
+ CAN_ERR_CRTL_RX_WARNING;
+ dev->can.can_stats.error_warning++;
+ break;
+ case USB_8DEV_STATUSMSG_BUSHEAVY:
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = (txerr > rxerr) ?
+ CAN_ERR_CRTL_TX_PASSIVE :
+ CAN_ERR_CRTL_RX_PASSIVE;
+ dev->can.can_stats.error_passive++;
+ break;
+ default:
+ cf->data[2] |= CAN_ERR_PROT_UNSPEC;
+ break;
+ }
+
+ if (tx_errors) {
+ cf->data[2] |= CAN_ERR_PROT_TX;
+ stats->tx_errors++;
+ }
+
+ if (rx_errors)
+ stats->rx_errors++;
+
+ cf->data[6] = txerr;
+ cf->data[7] = rxerr;
+
+ dev->bec.txerr = txerr;
+ dev->bec.rxerr = rxerr;
+
+ } else {
+ dev_warn(dev->udev->dev.parent, "frame type %d unknown",
+ msg->type);
+ return;
+ }
+
+ netif_rx(skb);
+
+ stats->rx_packets++;
+ stats->rx_bytes += cf->can_dlc;
+}
+
+/*
+ * Callback for reading data from device
+ *
+ * Check urb status, call read function and resubmit urb read operation.
+ */
+static void usb_8dev_read_bulk_callback(struct urb *urb)
+{
+ struct usb_8dev *dev = urb->context;
+ struct net_device *netdev;
+ int retval;
+ int pos = 0;
+
+ netdev = dev->netdev;
+
+ if (!netif_device_present(netdev))
+ return;
+
+ switch (urb->status) {
+ case 0: /* success */
+ break;
+
+ case -ENOENT:
+ case -ESHUTDOWN:
+ return;
+
+ default:
+ dev_info(netdev->dev.parent, "Rx URB aborted (%d)\n",
+ urb->status);
+ goto resubmit_urb;
+ }
+
+ while (pos < urb->actual_length) {
+ struct usb_8dev_rx_msg *msg;
+
+ msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos);
+
+ usb_8dev_rx_can_msg(dev, msg);
+
+ pos += sizeof(struct usb_8dev_rx_msg);
+
+ if (pos > urb->actual_length) {
+ dev_err(dev->udev->dev.parent, "format error\n");
+ break;
+ }
+ }
+
+resubmit_urb:
+ usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
+ urb->transfer_buffer, RX_BUFFER_SIZE,
+ usb_8dev_read_bulk_callback, dev);
+
+ retval = usb_submit_urb(urb, GFP_ATOMIC);
+
+ if (retval == -ENODEV)
+ netif_device_detach(netdev);
+ else if (retval)
+ dev_err(netdev->dev.parent,
+ "failed resubmitting read bulk urb: %d\n", retval);
+}
+
+/*
+ * Callback handler for write operations
+ *
+ * Free allocated buffers, check transmit status and
+ * calculate statistic.
+ */
+static void usb_8dev_write_bulk_callback(struct urb *urb)
+{
+ struct usb_8dev_tx_urb_context *context = urb->context;
+ struct usb_8dev *dev;
+ struct net_device *netdev;
+
+ BUG_ON(!context);
+
+ dev = context->dev;
+ netdev = dev->netdev;
+
+ /* free up our allocated buffer */
+ usb_free_coherent(urb->dev, urb->transfer_buffer_length,
+ urb->transfer_buffer, urb->transfer_dma);
+
+ atomic_dec(&dev->active_tx_urbs);
+
+ if (!netif_device_present(netdev))
+ return;
+
+ if (urb->status)
+ dev_info(netdev->dev.parent, "Tx URB aborted (%d)\n",
+ urb->status);
+
+ netdev->trans_start = jiffies;
+
+ netdev->stats.tx_packets++;
+ netdev->stats.tx_bytes += context->dlc;
+
+ can_get_echo_skb(netdev, context->echo_index);
+
+ /* Release context */
+ context->echo_index = MAX_TX_URBS;
+
+ if (netif_queue_stopped(netdev))
+ netif_wake_queue(netdev);
+}
+
+/* Send data to device */
+static netdev_tx_t usb_8dev_start_xmit(struct sk_buff *skb,
+ struct net_device *netdev)
+{
+ struct usb_8dev *dev = netdev_priv(netdev);
+ struct net_device_stats *stats = &netdev->stats;
+ struct can_frame *cf = (struct can_frame *) skb->data;
+ struct usb_8dev_tx_msg *msg;
+ struct urb *urb;
+ struct usb_8dev_tx_urb_context *context = NULL;
+ u8 *buf;
+ int i, err;
+ size_t size = sizeof(struct usb_8dev_tx_msg);
+
+ if (can_dropped_invalid_skb(netdev, skb))
+ return NETDEV_TX_OK;
+
+ /* create a URB, and a buffer for it, and copy the data to the URB */
+ urb = usb_alloc_urb(0, GFP_ATOMIC);
+ if (!urb) {
+ dev_err(netdev->dev.parent, "No memory left for URBs\n");
+ goto nomem;
+ }
+
+ buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC,
+ &urb->transfer_dma);
+ if (!buf) {
+ dev_err(netdev->dev.parent, "No memory left for USB buffer\n");
+ usb_free_urb(urb);
+ goto nomem;
+ }
+
+ memset(buf, 0, size);
+
+ msg = (struct usb_8dev_tx_msg *)buf;
+ msg->begin = USB_8DEV_DATA_START;
+ msg->flags = 0x00;
+
+ if (cf->can_id & CAN_RTR_FLAG)
+ msg->flags |= USB_8DEV_RTR;
+
+ if (cf->can_id & CAN_EFF_FLAG)
+ msg->flags |= USB_8DEV_EXTID;
+
+ msg->id = cpu_to_be32(cf->can_id & CAN_ERR_MASK);
+
+ msg->dlc = cf->can_dlc;
+
+ for (i = 0; i < cf->can_dlc; i++)
+ msg->data[i] = cf->data[i];
+
+ msg->end = USB_8DEV_DATA_END;
+
+
+ for (i = 0; i < MAX_TX_URBS; i++) {
+ if (dev->tx_contexts[i].echo_index == MAX_TX_URBS) {
+ context = &dev->tx_contexts[i];
+ break;
+ }
+ }
+
+ /*
+ * May never happen! When this happens we'd more URBs in flight as
+ * allowed (MAX_TX_URBS).
+ */
+ if (!context) {
+ usb_unanchor_urb(urb);
+ usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
+
+ dev_warn(netdev->dev.parent, "couldn't find free context");
+
+ return NETDEV_TX_BUSY;
+ }
+
+ context->dev = dev;
+ context->echo_index = i;
+ context->dlc = cf->can_dlc;
+
+ usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf,
+ size, usb_8dev_write_bulk_callback, context);
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+ usb_anchor_urb(urb, &dev->tx_submitted);
+
+ can_put_echo_skb(skb, netdev, context->echo_index);
+
+ atomic_inc(&dev->active_tx_urbs);
+
+ err = usb_submit_urb(urb, GFP_ATOMIC);
+ if (unlikely(err)) {
+ can_free_echo_skb(netdev, context->echo_index);
+
+ usb_unanchor_urb(urb);
+ usb_free_coherent(dev->udev, size, buf, urb->transfer_dma);
+ dev_kfree_skb(skb);
+
+ atomic_dec(&dev->active_tx_urbs);
+
+ if (err == -ENODEV) {
+ netif_device_detach(netdev);
+ } else {
+ dev_warn(netdev->dev.parent, "failed tx_urb %d\n", err);
+
+ stats->tx_dropped++;
+ }
+ } else {
+ netdev->trans_start = jiffies;
+
+ /* Slow down tx path */
+ if (atomic_read(&dev->active_tx_urbs) >= MAX_TX_URBS ||
+ dev->free_slots < 5) {
+ netif_stop_queue(netdev);
+ }
+ }
+
+ /*
+ * Release our reference to this URB, the USB core will eventually free
+ * it entirely.
+ */
+ usb_free_urb(urb);
+
+ return NETDEV_TX_OK;
+
+nomem:
+ dev_kfree_skb(skb);
+ stats->tx_dropped++;
+
+ return NETDEV_TX_OK;
+}
+
+static int usb_8dev_get_berr_counter(const struct net_device *netdev,
+ struct can_berr_counter *bec)
+{
+ struct usb_8dev *dev = netdev_priv(netdev);
+
+ bec->txerr = dev->bec.txerr;
+ bec->rxerr = dev->bec.rxerr;
+
+ return 0;
+}
+
+/* Start USB device */
+static int usb_8dev_start(struct usb_8dev *dev)
+{
+ struct net_device *netdev = dev->netdev;
+ int err, i;
+
+ dev->free_slots = 15; /* initial size */
+
+ for (i = 0; i < MAX_RX_URBS; i++) {
+ struct urb *urb = NULL;
+ u8 *buf = NULL;
+
+ /* create a URB, and a buffer for it */
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!urb) {
+ dev_err(netdev->dev.parent,
+ "No memory left for URBs\n");
+ return -ENOMEM;
+ }
+
+ buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, GFP_KERNEL,
+ &urb->transfer_dma);
+ if (!buf) {
+ dev_err(netdev->dev.parent,
+ "No memory left for USB buffer\n");
+ usb_free_urb(urb);
+ return -ENOMEM;
+ }
+
+ usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
+ buf, RX_BUFFER_SIZE,
+ usb_8dev_read_bulk_callback, dev);
+ urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+ usb_anchor_urb(urb, &dev->rx_submitted);
+
+ err = usb_submit_urb(urb, GFP_KERNEL);
+ if (err) {
+ if (err == -ENODEV)
+ netif_device_detach(dev->netdev);
+
+ usb_unanchor_urb(urb);
+ usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
+ urb->transfer_dma);
+ break;
+ }
+
+ /* Drop reference, USB core will take care of freeing it */
+ usb_free_urb(urb);
+ }
+
+ /* Did we submit any URBs */
+ if (i == 0) {
+ dev_warn(netdev->dev.parent, "couldn't setup read URBs\n");
+ return err;
+ }
+
+ /* Warn if we've couldn't transmit all the URBs */
+ if (i < MAX_RX_URBS)
+ dev_warn(netdev->dev.parent, "rx performance may be slow\n");
+
+ err = usb_8dev_cmd_open(dev);
+ if (err)
+ goto failed;
+
+ dev->can.state = CAN_STATE_ERROR_ACTIVE;
+
+ return 0;
+
+failed:
+ if (err == -ENODEV)
+ netif_device_detach(dev->netdev);
+
+ dev_warn(netdev->dev.parent, "couldn't submit control: %d\n", err);
+
+ return err;
+}
+
+/* Open USB device */
+static int usb_8dev_open(struct net_device *netdev)
+{
+ struct usb_8dev *dev = netdev_priv(netdev);
+ int err;
+
+ /* common open */
+ err = open_candev(netdev);
+ if (err)
+ return err;
+
+ /* finally start device */
+ err = usb_8dev_start(dev);
+ if (err) {
+ if (err == -ENODEV)
+ netif_device_detach(dev->netdev);
+
+ dev_warn(netdev->dev.parent, "couldn't start device: %d\n",
+ err);
+
+ close_candev(netdev);
+
+ return err;
+ }
+
+ netif_start_queue(netdev);
+
+ return 0;
+}
+
+static void unlink_all_urbs(struct usb_8dev *dev)
+{
+ int i;
+
+ usb_kill_anchored_urbs(&dev->rx_submitted);
+
+ usb_kill_anchored_urbs(&dev->tx_submitted);
+ atomic_set(&dev->active_tx_urbs, 0);
+
+ for (i = 0; i < MAX_TX_URBS; i++)
+ dev->tx_contexts[i].echo_index = MAX_TX_URBS;
+}
+
+/* Close USB device */
+static int usb_8dev_close(struct net_device *netdev)
+{
+ struct usb_8dev *dev = netdev_priv(netdev);
+ int err = 0;
+
+ /* Send CLOSE command to CAN controller */
+ err = usb_8dev_cmd_close(dev);
+ if (err)
+ dev_warn(netdev->dev.parent, "couldn't stop device");
+
+ dev->can.state = CAN_STATE_STOPPED;
+
+ /* Stop polling */
+ unlink_all_urbs(dev);
+
+ netif_stop_queue(netdev);
+
+ close_candev(netdev);
+
+ return err;
+}
+
+static const struct net_device_ops usb_8dev_netdev_ops = {
+ .ndo_open = usb_8dev_open,
+ .ndo_stop = usb_8dev_close,
+ .ndo_start_xmit = usb_8dev_start_xmit,
+};
+
+static struct can_bittiming_const usb_8dev_bittiming_const = {
+ .name = "usb_8dev",
+ .tseg1_min = USB_8DEV_TSEG1_MIN,
+ .tseg1_max = USB_8DEV_TSEG1_MAX,
+ .tseg2_min = USB_8DEV_TSEG2_MIN,
+ .tseg2_max = USB_8DEV_TSEG2_MAX,
+ .sjw_max = USB_8DEV_SJW_MAX,
+ .brp_min = USB_8DEV_BRP_MIN,
+ .brp_max = USB_8DEV_BRP_MAX,
+ .brp_inc = USB_8DEV_BRP_INC,
+};
+
+/*
+ * Probe USB device
+ *
+ * Check device and firmware.
+ * Set supported modes and bittiming constants.
+ * Allocate some memory.
+ */
+static int usb_8dev_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct net_device *netdev;
+ struct usb_8dev *dev;
+ int i, err = -ENOMEM;
+ u32 version;
+ char buf[18];
+ struct usb_device *usbdev = interface_to_usbdev(intf);
+
+ /* product id looks strange, better we also check iProdukt string */
+ if (usb_string(usbdev, usbdev->descriptor.iProduct, buf,
+ sizeof(buf)) > 0 && strcmp(buf, "USB2CAN converter")) {
+ dev_info(&usbdev->dev, "ignoring: not an USB2CAN converter\n");
+ return -ENODEV;
+ }
+
+ netdev = alloc_candev(sizeof(struct usb_8dev), MAX_TX_URBS);
+ if (!netdev) {
+ dev_err(&intf->dev, "Couldn't alloc candev\n");
+ return -ENOMEM;
+ }
+
+ dev = netdev_priv(netdev);
+
+ dev->udev = usbdev;
+ dev->netdev = netdev;
+
+ dev->can.state = CAN_STATE_STOPPED;
+ dev->can.clock.freq = USB_8DEV_ABP_CLOCK;
+ dev->can.bittiming_const = &usb_8dev_bittiming_const;
+ dev->can.do_set_bittiming = usb_8dev_set_bittiming;
+ dev->can.do_set_mode = usb_8dev_set_mode;
+ dev->can.do_get_berr_counter = usb_8dev_get_berr_counter;
+ dev->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
+ CAN_CTRLMODE_LISTENONLY |
+ CAN_CTRLMODE_ONE_SHOT;
+
+ netdev->netdev_ops = &usb_8dev_netdev_ops;
+
+ netdev->flags |= IFF_ECHO; /* we support local echo */
+
+ init_usb_anchor(&dev->rx_submitted);
+
+ init_usb_anchor(&dev->tx_submitted);
+ atomic_set(&dev->active_tx_urbs, 0);
+
+ for (i = 0; i < MAX_TX_URBS; i++)
+ dev->tx_contexts[i].echo_index = MAX_TX_URBS;
+
+ dev->cmd_msg_buffer = kzalloc(sizeof(struct usb_8dev_cmd_msg),
+ GFP_KERNEL);
+ if (!dev->cmd_msg_buffer) {
+ dev_err(&intf->dev, "Couldn't alloc Tx buffer\n");
+ goto cleanup_candev;
+ }
+
+ usb_set_intfdata(intf, dev);
+
+ SET_NETDEV_DEV(netdev, &intf->dev);
+
+ mutex_init(&dev->usb_8dev_cmd_lock);
+
+ err = usb_8dev_cmd_version(dev, &version);
+ if (err) {
+ dev_err(netdev->dev.parent, "can't get firmware version\n");
+ goto cleanup_cmd_msg_buffer;
+ } else {
+ dev_info(netdev->dev.parent,
+ "firmware: %d.%d, hardware: %d.%d\n",
+ (version>>24) & 0xff, (version>>16) & 0xff,
+ (version>>8) & 0xff, version & 0xff);
+ }
+
+ err = register_candev(netdev);
+ if (err) {
+ dev_err(netdev->dev.parent,
+ "couldn't register CAN device: %d\n", err);
+ goto cleanup_cmd_msg_buffer;
+ }
+
+ if (device_create_file(&intf->dev, &dev_attr_firmware))
+ dev_err(&intf->dev,
+ "Couldn't create device file for firmware\n");
+
+ if (device_create_file(&intf->dev, &dev_attr_hardware))
+ dev_err(&intf->dev,
+ "Couldn't create device file for hardware\n");
+
+ /* let the user know what node this device is now attached to */
+ dev_info(netdev->dev.parent, "device registered as %s\n", netdev->name);
+ return 0;
+
+cleanup_cmd_msg_buffer:
+ kfree(dev->cmd_msg_buffer);
+
+cleanup_candev:
+ free_candev(netdev);
+
+ return err;
+
+}
+
+/* Called by the usb core when driver is unloaded or device is removed */
+static void usb_8dev_disconnect(struct usb_interface *intf)
+{
+ struct usb_8dev *dev = usb_get_intfdata(intf);
+
+ device_remove_file(&intf->dev, &dev_attr_firmware);
+ device_remove_file(&intf->dev, &dev_attr_hardware);
+
+ usb_set_intfdata(intf, NULL);
+
+ if (dev) {
+ dev_info(&intf->dev, "disconnect %s\n", dev->netdev->name);
+
+ unregister_netdev(dev->netdev);
+ free_candev(dev->netdev);
+
+ unlink_all_urbs(dev);
+ }
+
+}
+
+static struct usb_driver usb_8dev_driver = {
+ .name = "usb_8dev",
+ .probe = usb_8dev_probe,
+ .disconnect = usb_8dev_disconnect,
+ .id_table = usb_8dev_table,
+};
+
+module_usb_driver(usb_8dev_driver);
+
+MODULE_AUTHOR("Bernd Krumboeck <krumbo...@universalnet.at>");
+MODULE_DESCRIPTION("CAN driver for UAB 8 devices USB2CAN interfaces");
+MODULE_LICENSE("GPL v2");
+
--
1.7.10.4
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