| /* |
| * CAN driver for "8 devices" USB2CAN converter |
| * |
| * Copyright (C) 2012 Bernd Krumboeck (krumboeck@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. |
| * |
| * 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 (info@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> |
| #include <linux/can/led.h> |
| |
| /* driver constants */ |
| #define MAX_RX_URBS 20 |
| #define MAX_TX_URBS 20 |
| #define RX_BUFFER_SIZE 64 |
| |
| /* vendor and product id */ |
| #define USB_8DEV_VENDOR_ID 0x0483 |
| #define USB_8DEV_PRODUCT_ID 0x1234 |
| |
| /* endpoints */ |
| enum usb_8dev_endpoint { |
| USB_8DEV_ENDP_DATA_RX = 1, |
| USB_8DEV_ENDP_DATA_TX, |
| USB_8DEV_ENDP_CMD_RX, |
| USB_8DEV_ENDP_CMD_TX |
| }; |
| |
| /* device CAN clock */ |
| #define USB_8DEV_ABP_CLOCK 32000000 |
| |
| /* 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 |
| }; |
| |
| /* command options */ |
| #define USB_8DEV_BAUD_MANUAL 0x09 |
| #define USB_8DEV_CMD_START 0x11 |
| #define USB_8DEV_CMD_END 0x22 |
| |
| #define USB_8DEV_CMD_SUCCESS 0 |
| #define USB_8DEV_CMD_ERROR 255 |
| |
| #define USB_8DEV_CMD_TIMEOUT 1000 |
| |
| /* 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 0x27 /* CRC Error */ |
| |
| #define USB_8DEV_RP_MASK 0x7F /* Mask for Receive Error Bit */ |
| |
| |
| /* table of devices that work with this driver */ |
| static const 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_priv *priv; |
| |
| u32 echo_index; |
| u8 dlc; |
| }; |
| |
| /* Structure to hold all of our device specific stuff */ |
| struct usb_8dev_priv { |
| 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; |
| |
| 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 int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size) |
| { |
| int actual_length; |
| |
| return usb_bulk_msg(priv->udev, |
| usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX), |
| msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT); |
| } |
| |
| static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size, |
| int *actual_length) |
| { |
| return usb_bulk_msg(priv->udev, |
| usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX), |
| msg, size, actual_length, USB_8DEV_CMD_TIMEOUT); |
| } |
| |
| /* Send command to device and receive result. |
| * Command was successful when opt1 = 0. |
| */ |
| static int usb_8dev_send_cmd(struct usb_8dev_priv *priv, |
| struct usb_8dev_cmd_msg *out, |
| struct usb_8dev_cmd_msg *in) |
| { |
| int err; |
| int num_bytes_read; |
| struct net_device *netdev; |
| |
| netdev = priv->netdev; |
| |
| out->begin = USB_8DEV_CMD_START; |
| out->end = USB_8DEV_CMD_END; |
| |
| mutex_lock(&priv->usb_8dev_cmd_lock); |
| |
| memcpy(priv->cmd_msg_buffer, out, |
| sizeof(struct usb_8dev_cmd_msg)); |
| |
| err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer, |
| sizeof(struct usb_8dev_cmd_msg)); |
| if (err < 0) { |
| netdev_err(netdev, "sending command message failed\n"); |
| goto failed; |
| } |
| |
| err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer, |
| sizeof(struct usb_8dev_cmd_msg), |
| &num_bytes_read); |
| if (err < 0) { |
| netdev_err(netdev, "no command message answer\n"); |
| goto failed; |
| } |
| |
| memcpy(in, priv->cmd_msg_buffer, 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) |
| err = -EPROTO; |
| |
| failed: |
| mutex_unlock(&priv->usb_8dev_cmd_lock); |
| return err; |
| } |
| |
| /* Send open command to device */ |
| static int usb_8dev_cmd_open(struct usb_8dev_priv *priv) |
| { |
| struct can_bittiming *bt = &priv->can.bittiming; |
| struct usb_8dev_cmd_msg outmsg; |
| struct usb_8dev_cmd_msg inmsg; |
| u32 ctrlmode = priv->can.ctrlmode; |
| u32 flags = USB_8DEV_STATUS_FRAME; |
| __be32 beflags; |
| __be16 bebrp; |
| |
| memset(&outmsg, 0, sizeof(outmsg)); |
| 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 */ |
| 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; |
| |
| beflags = cpu_to_be32(flags); |
| memcpy(&outmsg.data[5], &beflags, sizeof(beflags)); |
| |
| return usb_8dev_send_cmd(priv, &outmsg, &inmsg); |
| } |
| |
| /* Send close command to device */ |
| static int usb_8dev_cmd_close(struct usb_8dev_priv *priv) |
| { |
| struct usb_8dev_cmd_msg inmsg; |
| struct usb_8dev_cmd_msg outmsg = { |
| .channel = 0, |
| .command = USB_8DEV_CLOSE, |
| .opt1 = 0, |
| .opt2 = 0 |
| }; |
| |
| return usb_8dev_send_cmd(priv, &outmsg, &inmsg); |
| } |
| |
| /* Get firmware and hardware version */ |
| static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res) |
| { |
| struct usb_8dev_cmd_msg inmsg; |
| struct usb_8dev_cmd_msg outmsg = { |
| .channel = 0, |
| .command = USB_8DEV_GET_SOFTW_HARDW_VER, |
| .opt1 = 0, |
| .opt2 = 0 |
| }; |
| |
| int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg); |
| if (err) |
| return err; |
| |
| *res = be32_to_cpup((__be32 *)inmsg.data); |
| |
| return err; |
| } |
| |
| /* 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_priv *priv = netdev_priv(netdev); |
| int err = 0; |
| |
| switch (mode) { |
| case CAN_MODE_START: |
| err = usb_8dev_cmd_open(priv); |
| if (err) |
| netdev_warn(netdev, "couldn't start device"); |
| break; |
| |
| default: |
| return -EOPNOTSUPP; |
| } |
| |
| return err; |
| } |
| |
| /* Read error/status frames */ |
| static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv, |
| struct usb_8dev_rx_msg *msg) |
| { |
| struct can_frame *cf; |
| struct sk_buff *skb; |
| struct net_device_stats *stats = &priv->netdev->stats; |
| |
| /* 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(priv->netdev, &cf); |
| if (!skb) |
| return; |
| |
| switch (state) { |
| case USB_8DEV_STATUSMSG_OK: |
| priv->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: |
| priv->can.state = CAN_STATE_BUS_OFF; |
| cf->can_id |= CAN_ERR_BUSOFF; |
| can_bus_off(priv->netdev); |
| break; |
| case USB_8DEV_STATUSMSG_OVERRUN: |
| case USB_8DEV_STATUSMSG_BUSLIGHT: |
| case USB_8DEV_STATUSMSG_BUSHEAVY: |
| cf->can_id |= CAN_ERR_CRTL; |
| break; |
| default: |
| priv->can.state = CAN_STATE_ERROR_WARNING; |
| cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
| priv->can.can_stats.bus_error++; |
| break; |
| } |
| |
| switch (state) { |
| case USB_8DEV_STATUSMSG_OK: |
| case USB_8DEV_STATUSMSG_BUSOFF: |
| break; |
| 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_UNSPEC; |
| cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ | |
| CAN_ERR_PROT_LOC_CRC_DEL; |
| 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->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; |
| stats->rx_over_errors++; |
| rx_errors = 1; |
| break; |
| case USB_8DEV_STATUSMSG_BUSLIGHT: |
| priv->can.state = CAN_STATE_ERROR_WARNING; |
| cf->data[1] = (txerr > rxerr) ? |
| CAN_ERR_CRTL_TX_WARNING : |
| CAN_ERR_CRTL_RX_WARNING; |
| priv->can.can_stats.error_warning++; |
| break; |
| case USB_8DEV_STATUSMSG_BUSHEAVY: |
| priv->can.state = CAN_STATE_ERROR_PASSIVE; |
| cf->data[1] = (txerr > rxerr) ? |
| CAN_ERR_CRTL_TX_PASSIVE : |
| CAN_ERR_CRTL_RX_PASSIVE; |
| priv->can.can_stats.error_passive++; |
| break; |
| default: |
| netdev_warn(priv->netdev, |
| "Unknown status/error message (%d)\n", state); |
| 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; |
| |
| priv->bec.txerr = txerr; |
| priv->bec.rxerr = rxerr; |
| |
| netif_rx(skb); |
| |
| stats->rx_packets++; |
| stats->rx_bytes += cf->can_dlc; |
| } |
| |
| /* Read data and status frames */ |
| static void usb_8dev_rx_can_msg(struct usb_8dev_priv *priv, |
| struct usb_8dev_rx_msg *msg) |
| { |
| struct can_frame *cf; |
| struct sk_buff *skb; |
| struct net_device_stats *stats = &priv->netdev->stats; |
| |
| if (msg->type == USB_8DEV_TYPE_ERROR_FRAME && |
| msg->flags == USB_8DEV_ERR_FLAG) { |
| usb_8dev_rx_err_msg(priv, msg); |
| } else if (msg->type == USB_8DEV_TYPE_CAN_FRAME) { |
| skb = alloc_can_skb(priv->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 |
| memcpy(cf->data, msg->data, cf->can_dlc); |
| |
| netif_rx(skb); |
| |
| stats->rx_packets++; |
| stats->rx_bytes += cf->can_dlc; |
| |
| can_led_event(priv->netdev, CAN_LED_EVENT_RX); |
| } else { |
| netdev_warn(priv->netdev, "frame type %d unknown", |
| msg->type); |
| } |
| |
| } |
| |
| /* 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_priv *priv = urb->context; |
| struct net_device *netdev; |
| int retval; |
| int pos = 0; |
| |
| netdev = priv->netdev; |
| |
| if (!netif_device_present(netdev)) |
| return; |
| |
| switch (urb->status) { |
| case 0: /* success */ |
| break; |
| |
| case -ENOENT: |
| case -ESHUTDOWN: |
| return; |
| |
| default: |
| netdev_info(netdev, "Rx URB aborted (%d)\n", |
| urb->status); |
| goto resubmit_urb; |
| } |
| |
| while (pos < urb->actual_length) { |
| struct usb_8dev_rx_msg *msg; |
| |
| if (pos + sizeof(struct usb_8dev_rx_msg) > urb->actual_length) { |
| netdev_err(priv->netdev, "format error\n"); |
| break; |
| } |
| |
| msg = (struct usb_8dev_rx_msg *)(urb->transfer_buffer + pos); |
| usb_8dev_rx_can_msg(priv, msg); |
| |
| pos += sizeof(struct usb_8dev_rx_msg); |
| } |
| |
| resubmit_urb: |
| usb_fill_bulk_urb(urb, priv->udev, |
| usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_RX), |
| urb->transfer_buffer, RX_BUFFER_SIZE, |
| usb_8dev_read_bulk_callback, priv); |
| |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| |
| if (retval == -ENODEV) |
| netif_device_detach(netdev); |
| else if (retval) |
| netdev_err(netdev, |
| "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_priv *priv; |
| struct net_device *netdev; |
| |
| BUG_ON(!context); |
| |
| priv = context->priv; |
| netdev = priv->netdev; |
| |
| /* free up our allocated buffer */ |
| usb_free_coherent(urb->dev, urb->transfer_buffer_length, |
| urb->transfer_buffer, urb->transfer_dma); |
| |
| atomic_dec(&priv->active_tx_urbs); |
| |
| if (!netif_device_present(netdev)) |
| return; |
| |
| if (urb->status) |
| netdev_info(netdev, "Tx URB aborted (%d)\n", |
| urb->status); |
| |
| netdev->stats.tx_packets++; |
| netdev->stats.tx_bytes += context->dlc; |
| |
| can_get_echo_skb(netdev, context->echo_index); |
| |
| can_led_event(netdev, CAN_LED_EVENT_TX); |
| |
| /* Release context */ |
| context->echo_index = MAX_TX_URBS; |
| |
| 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_priv *priv = 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) { |
| netdev_err(netdev, "No memory left for URBs\n"); |
| goto nomem; |
| } |
| |
| buf = usb_alloc_coherent(priv->udev, size, GFP_ATOMIC, |
| &urb->transfer_dma); |
| if (!buf) { |
| netdev_err(netdev, "No memory left for USB buffer\n"); |
| goto nomembuf; |
| } |
| |
| 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; |
| memcpy(msg->data, cf->data, cf->can_dlc); |
| msg->end = USB_8DEV_DATA_END; |
| |
| for (i = 0; i < MAX_TX_URBS; i++) { |
| if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { |
| context = &priv->tx_contexts[i]; |
| break; |
| } |
| } |
| |
| /* May never happen! When this happens we'd more URBs in flight as |
| * allowed (MAX_TX_URBS). |
| */ |
| if (!context) |
| goto nofreecontext; |
| |
| context->priv = priv; |
| context->echo_index = i; |
| context->dlc = cf->can_dlc; |
| |
| usb_fill_bulk_urb(urb, priv->udev, |
| usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_DATA_TX), |
| buf, size, usb_8dev_write_bulk_callback, context); |
| urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| usb_anchor_urb(urb, &priv->tx_submitted); |
| |
| can_put_echo_skb(skb, netdev, context->echo_index); |
| |
| atomic_inc(&priv->active_tx_urbs); |
| |
| err = usb_submit_urb(urb, GFP_ATOMIC); |
| if (unlikely(err)) |
| goto failed; |
| else if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS) |
| /* Slow down tx path */ |
| 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; |
| |
| nofreecontext: |
| usb_unanchor_urb(urb); |
| usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); |
| |
| netdev_warn(netdev, "couldn't find free context"); |
| |
| return NETDEV_TX_BUSY; |
| |
| failed: |
| can_free_echo_skb(netdev, context->echo_index); |
| |
| usb_unanchor_urb(urb); |
| usb_free_coherent(priv->udev, size, buf, urb->transfer_dma); |
| |
| atomic_dec(&priv->active_tx_urbs); |
| |
| if (err == -ENODEV) |
| netif_device_detach(netdev); |
| else |
| netdev_warn(netdev, "failed tx_urb %d\n", err); |
| |
| nomembuf: |
| usb_free_urb(urb); |
| |
| 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_priv *priv = netdev_priv(netdev); |
| |
| bec->txerr = priv->bec.txerr; |
| bec->rxerr = priv->bec.rxerr; |
| |
| return 0; |
| } |
| |
| /* Start USB device */ |
| static int usb_8dev_start(struct usb_8dev_priv *priv) |
| { |
| struct net_device *netdev = priv->netdev; |
| int err, i; |
| |
| for (i = 0; i < MAX_RX_URBS; i++) { |
| struct urb *urb = NULL; |
| u8 *buf; |
| |
| /* create a URB, and a buffer for it */ |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) { |
| netdev_err(netdev, "No memory left for URBs\n"); |
| err = -ENOMEM; |
| break; |
| } |
| |
| buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL, |
| &urb->transfer_dma); |
| if (!buf) { |
| netdev_err(netdev, "No memory left for USB buffer\n"); |
| usb_free_urb(urb); |
| err = -ENOMEM; |
| break; |
| } |
| |
| usb_fill_bulk_urb(urb, priv->udev, |
| usb_rcvbulkpipe(priv->udev, |
| USB_8DEV_ENDP_DATA_RX), |
| buf, RX_BUFFER_SIZE, |
| usb_8dev_read_bulk_callback, priv); |
| urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
| usb_anchor_urb(urb, &priv->rx_submitted); |
| |
| err = usb_submit_urb(urb, GFP_KERNEL); |
| if (err) { |
| usb_unanchor_urb(urb); |
| usb_free_coherent(priv->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) { |
| netdev_warn(netdev, "couldn't setup read URBs\n"); |
| return err; |
| } |
| |
| /* Warn if we've couldn't transmit all the URBs */ |
| if (i < MAX_RX_URBS) |
| netdev_warn(netdev, "rx performance may be slow\n"); |
| |
| err = usb_8dev_cmd_open(priv); |
| if (err) |
| goto failed; |
| |
| priv->can.state = CAN_STATE_ERROR_ACTIVE; |
| |
| return 0; |
| |
| failed: |
| if (err == -ENODEV) |
| netif_device_detach(priv->netdev); |
| |
| netdev_warn(netdev, "couldn't submit control: %d\n", err); |
| |
| return err; |
| } |
| |
| /* Open USB device */ |
| static int usb_8dev_open(struct net_device *netdev) |
| { |
| struct usb_8dev_priv *priv = netdev_priv(netdev); |
| int err; |
| |
| /* common open */ |
| err = open_candev(netdev); |
| if (err) |
| return err; |
| |
| can_led_event(netdev, CAN_LED_EVENT_OPEN); |
| |
| /* finally start device */ |
| err = usb_8dev_start(priv); |
| if (err) { |
| if (err == -ENODEV) |
| netif_device_detach(priv->netdev); |
| |
| netdev_warn(netdev, "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_priv *priv) |
| { |
| int i; |
| |
| usb_kill_anchored_urbs(&priv->rx_submitted); |
| |
| usb_kill_anchored_urbs(&priv->tx_submitted); |
| atomic_set(&priv->active_tx_urbs, 0); |
| |
| for (i = 0; i < MAX_TX_URBS; i++) |
| priv->tx_contexts[i].echo_index = MAX_TX_URBS; |
| } |
| |
| /* Close USB device */ |
| static int usb_8dev_close(struct net_device *netdev) |
| { |
| struct usb_8dev_priv *priv = netdev_priv(netdev); |
| int err = 0; |
| |
| /* Send CLOSE command to CAN controller */ |
| err = usb_8dev_cmd_close(priv); |
| if (err) |
| netdev_warn(netdev, "couldn't stop device"); |
| |
| priv->can.state = CAN_STATE_STOPPED; |
| |
| netif_stop_queue(netdev); |
| |
| /* Stop polling */ |
| unlink_all_urbs(priv); |
| |
| close_candev(netdev); |
| |
| can_led_event(netdev, CAN_LED_EVENT_STOP); |
| |
| 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 const struct can_bittiming_const usb_8dev_bittiming_const = { |
| .name = "usb_8dev", |
| .tseg1_min = 1, |
| .tseg1_max = 16, |
| .tseg2_min = 1, |
| .tseg2_max = 8, |
| .sjw_max = 4, |
| .brp_min = 1, |
| .brp_max = 1024, |
| .brp_inc = 1, |
| }; |
| |
| /* 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_priv *priv; |
| 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 iProduct 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_priv), MAX_TX_URBS); |
| if (!netdev) { |
| dev_err(&intf->dev, "Couldn't alloc candev\n"); |
| return -ENOMEM; |
| } |
| |
| priv = netdev_priv(netdev); |
| |
| priv->udev = usbdev; |
| priv->netdev = netdev; |
| |
| priv->can.state = CAN_STATE_STOPPED; |
| priv->can.clock.freq = USB_8DEV_ABP_CLOCK; |
| priv->can.bittiming_const = &usb_8dev_bittiming_const; |
| priv->can.do_set_mode = usb_8dev_set_mode; |
| priv->can.do_get_berr_counter = usb_8dev_get_berr_counter; |
| priv->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(&priv->rx_submitted); |
| |
| init_usb_anchor(&priv->tx_submitted); |
| atomic_set(&priv->active_tx_urbs, 0); |
| |
| for (i = 0; i < MAX_TX_URBS; i++) |
| priv->tx_contexts[i].echo_index = MAX_TX_URBS; |
| |
| priv->cmd_msg_buffer = kzalloc(sizeof(struct usb_8dev_cmd_msg), |
| GFP_KERNEL); |
| if (!priv->cmd_msg_buffer) |
| goto cleanup_candev; |
| |
| usb_set_intfdata(intf, priv); |
| |
| SET_NETDEV_DEV(netdev, &intf->dev); |
| |
| mutex_init(&priv->usb_8dev_cmd_lock); |
| |
| err = register_candev(netdev); |
| if (err) { |
| netdev_err(netdev, |
| "couldn't register CAN device: %d\n", err); |
| goto cleanup_cmd_msg_buffer; |
| } |
| |
| err = usb_8dev_cmd_version(priv, &version); |
| if (err) { |
| netdev_err(netdev, "can't get firmware version\n"); |
| goto cleanup_cmd_msg_buffer; |
| } else { |
| netdev_info(netdev, |
| "firmware: %d.%d, hardware: %d.%d\n", |
| (version>>24) & 0xff, (version>>16) & 0xff, |
| (version>>8) & 0xff, version & 0xff); |
| } |
| |
| devm_can_led_init(netdev); |
| |
| return 0; |
| |
| cleanup_cmd_msg_buffer: |
| kfree(priv->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_priv *priv = usb_get_intfdata(intf); |
| |
| usb_set_intfdata(intf, NULL); |
| |
| if (priv) { |
| netdev_info(priv->netdev, "device disconnected\n"); |
| |
| unregister_netdev(priv->netdev); |
| free_candev(priv->netdev); |
| |
| unlink_all_urbs(priv); |
| } |
| |
| } |
| |
| 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 <krumboeck@universalnet.at>"); |
| MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces"); |
| MODULE_LICENSE("GPL v2"); |