diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c | 835 |
1 files changed, 835 insertions, 0 deletions
diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c new file mode 100644 index 000000000000..b939a4c10b84 --- /dev/null +++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_core.c @@ -0,0 +1,835 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Parts of this driver are based on the following: + * - Kvaser linux leaf driver (version 4.78) + * - CAN driver for esd CAN-USB/2 + * - Kvaser linux usbcanII driver (version 5.3) + * - Kvaser linux mhydra driver (version 5.24) + * + * Copyright (C) 2002-2018 KVASER AB, Sweden. All rights reserved. + * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh + * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be> + * Copyright (C) 2015 Valeo S.A. + */ + +#include <linux/completion.h> +#include <linux/device.h> +#include <linux/gfp.h> +#include <linux/if.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/netdevice.h> +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/usb.h> + +#include <linux/can.h> +#include <linux/can/dev.h> +#include <linux/can/error.h> +#include <linux/can/netlink.h> + +#include "kvaser_usb.h" + +/* Kvaser USB vendor id. */ +#define KVASER_VENDOR_ID 0x0bfd + +/* Kvaser Leaf USB devices product ids */ +#define USB_LEAF_DEVEL_PRODUCT_ID 10 +#define USB_LEAF_LITE_PRODUCT_ID 11 +#define USB_LEAF_PRO_PRODUCT_ID 12 +#define USB_LEAF_SPRO_PRODUCT_ID 14 +#define USB_LEAF_PRO_LS_PRODUCT_ID 15 +#define USB_LEAF_PRO_SWC_PRODUCT_ID 16 +#define USB_LEAF_PRO_LIN_PRODUCT_ID 17 +#define USB_LEAF_SPRO_LS_PRODUCT_ID 18 +#define USB_LEAF_SPRO_SWC_PRODUCT_ID 19 +#define USB_MEMO2_DEVEL_PRODUCT_ID 22 +#define USB_MEMO2_HSHS_PRODUCT_ID 23 +#define USB_UPRO_HSHS_PRODUCT_ID 24 +#define USB_LEAF_LITE_GI_PRODUCT_ID 25 +#define USB_LEAF_PRO_OBDII_PRODUCT_ID 26 +#define USB_MEMO2_HSLS_PRODUCT_ID 27 +#define USB_LEAF_LITE_CH_PRODUCT_ID 28 +#define USB_BLACKBIRD_SPRO_PRODUCT_ID 29 +#define USB_OEM_MERCURY_PRODUCT_ID 34 +#define USB_OEM_LEAF_PRODUCT_ID 35 +#define USB_CAN_R_PRODUCT_ID 39 +#define USB_LEAF_LITE_V2_PRODUCT_ID 288 +#define USB_MINI_PCIE_HS_PRODUCT_ID 289 +#define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID 290 +#define USB_USBCAN_LIGHT_2HS_PRODUCT_ID 291 +#define USB_MINI_PCIE_2HS_PRODUCT_ID 292 + +/* Kvaser USBCan-II devices product ids */ +#define USB_USBCAN_REVB_PRODUCT_ID 2 +#define USB_VCI2_PRODUCT_ID 3 +#define USB_USBCAN2_PRODUCT_ID 4 +#define USB_MEMORATOR_PRODUCT_ID 5 + +/* Kvaser Minihydra USB devices product ids */ +#define USB_BLACKBIRD_V2_PRODUCT_ID 258 +#define USB_MEMO_PRO_5HS_PRODUCT_ID 260 +#define USB_USBCAN_PRO_5HS_PRODUCT_ID 261 +#define USB_USBCAN_LIGHT_4HS_PRODUCT_ID 262 +#define USB_LEAF_PRO_HS_V2_PRODUCT_ID 263 +#define USB_USBCAN_PRO_2HS_V2_PRODUCT_ID 264 +#define USB_MEMO_2HS_PRODUCT_ID 265 +#define USB_MEMO_PRO_2HS_V2_PRODUCT_ID 266 +#define USB_HYBRID_CANLIN_PRODUCT_ID 267 +#define USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID 268 +#define USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID 269 +#define USB_HYBRID_PRO_CANLIN_PRODUCT_ID 270 + +static inline bool kvaser_is_leaf(const struct usb_device_id *id) +{ + return (id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID && + id->idProduct <= USB_CAN_R_PRODUCT_ID) || + (id->idProduct >= USB_LEAF_LITE_V2_PRODUCT_ID && + id->idProduct <= USB_MINI_PCIE_2HS_PRODUCT_ID); +} + +static inline bool kvaser_is_usbcan(const struct usb_device_id *id) +{ + return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID && + id->idProduct <= USB_MEMORATOR_PRODUCT_ID; +} + +static inline bool kvaser_is_hydra(const struct usb_device_id *id) +{ + return id->idProduct >= USB_BLACKBIRD_V2_PRODUCT_ID && + id->idProduct <= USB_HYBRID_PRO_CANLIN_PRODUCT_ID; +} + +static const struct usb_device_id kvaser_usb_table[] = { + /* Leaf USB product IDs */ + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS | + KVASER_USB_HAS_SILENT_MODE }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) }, + + /* USBCANII USB product IDs */ + { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID), + .driver_info = KVASER_USB_HAS_TXRX_ERRORS }, + + /* Minihydra USB product IDs */ + { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_V2_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_5HS_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_5HS_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_4HS_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_HS_V2_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_PRO_2HS_V2_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_2HS_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO_PRO_2HS_V2_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_CANLIN_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_USBCAN_PRO_2HS_V2_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_ATI_MEMO_PRO_2HS_V2_PRODUCT_ID) }, + { USB_DEVICE(KVASER_VENDOR_ID, USB_HYBRID_PRO_CANLIN_PRODUCT_ID) }, + { } +}; +MODULE_DEVICE_TABLE(usb, kvaser_usb_table); + +int kvaser_usb_send_cmd(const struct kvaser_usb *dev, void *cmd, int len) +{ + int actual_len; /* Not used */ + + return usb_bulk_msg(dev->udev, + usb_sndbulkpipe(dev->udev, + dev->bulk_out->bEndpointAddress), + cmd, len, &actual_len, KVASER_USB_TIMEOUT); +} + +int kvaser_usb_recv_cmd(const struct kvaser_usb *dev, void *cmd, int len, + int *actual_len) +{ + return usb_bulk_msg(dev->udev, + usb_rcvbulkpipe(dev->udev, + dev->bulk_in->bEndpointAddress), + cmd, len, actual_len, KVASER_USB_TIMEOUT); +} + +static void kvaser_usb_send_cmd_callback(struct urb *urb) +{ + struct net_device *netdev = urb->context; + + kfree(urb->transfer_buffer); + + if (urb->status) + netdev_warn(netdev, "urb status received: %d\n", urb->status); +} + +int kvaser_usb_send_cmd_async(struct kvaser_usb_net_priv *priv, void *cmd, + int len) +{ + struct kvaser_usb *dev = priv->dev; + struct net_device *netdev = priv->netdev; + struct urb *urb; + int err; + + urb = usb_alloc_urb(0, GFP_ATOMIC); + if (!urb) + return -ENOMEM; + + usb_fill_bulk_urb(urb, dev->udev, + usb_sndbulkpipe(dev->udev, + dev->bulk_out->bEndpointAddress), + cmd, len, kvaser_usb_send_cmd_callback, netdev); + usb_anchor_urb(urb, &priv->tx_submitted); + + err = usb_submit_urb(urb, GFP_ATOMIC); + if (err) { + netdev_err(netdev, "Error transmitting URB\n"); + usb_unanchor_urb(urb); + } + usb_free_urb(urb); + + return 0; +} + +int kvaser_usb_can_rx_over_error(struct net_device *netdev) +{ + struct net_device_stats *stats = &netdev->stats; + struct can_frame *cf; + struct sk_buff *skb; + + stats->rx_over_errors++; + stats->rx_errors++; + + skb = alloc_can_err_skb(netdev, &cf); + if (!skb) { + stats->rx_dropped++; + netdev_warn(netdev, "No memory left for err_skb\n"); + return -ENOMEM; + } + + cf->can_id |= CAN_ERR_CRTL; + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; + + stats->rx_packets++; + stats->rx_bytes += cf->can_dlc; + netif_rx(skb); + + return 0; +} + +static void kvaser_usb_read_bulk_callback(struct urb *urb) +{ + struct kvaser_usb *dev = urb->context; + int err; + unsigned int i; + + switch (urb->status) { + case 0: + break; + case -ENOENT: + case -EPIPE: + case -EPROTO: + case -ESHUTDOWN: + return; + default: + dev_info(&dev->intf->dev, "Rx URB aborted (%d)\n", urb->status); + goto resubmit_urb; + } + + dev->ops->dev_read_bulk_callback(dev, urb->transfer_buffer, + urb->actual_length); + +resubmit_urb: + usb_fill_bulk_urb(urb, dev->udev, + usb_rcvbulkpipe(dev->udev, + dev->bulk_in->bEndpointAddress), + urb->transfer_buffer, KVASER_USB_RX_BUFFER_SIZE, + kvaser_usb_read_bulk_callback, dev); + + err = usb_submit_urb(urb, GFP_ATOMIC); + if (err == -ENODEV) { + for (i = 0; i < dev->nchannels; i++) { + if (!dev->nets[i]) + continue; + + netif_device_detach(dev->nets[i]->netdev); + } + } else if (err) { + dev_err(&dev->intf->dev, + "Failed resubmitting read bulk urb: %d\n", err); + } +} + +static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev) +{ + int i, err = 0; + + if (dev->rxinitdone) + return 0; + + for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++) { + struct urb *urb = NULL; + u8 *buf = NULL; + dma_addr_t buf_dma; + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + err = -ENOMEM; + break; + } + + buf = usb_alloc_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE, + GFP_KERNEL, &buf_dma); + if (!buf) { + dev_warn(&dev->intf->dev, + "No memory left for USB buffer\n"); + usb_free_urb(urb); + err = -ENOMEM; + break; + } + + usb_fill_bulk_urb(urb, dev->udev, + usb_rcvbulkpipe + (dev->udev, + dev->bulk_in->bEndpointAddress), + buf, KVASER_USB_RX_BUFFER_SIZE, + kvaser_usb_read_bulk_callback, dev); + urb->transfer_dma = buf_dma; + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + usb_anchor_urb(urb, &dev->rx_submitted); + + err = usb_submit_urb(urb, GFP_KERNEL); + if (err) { + usb_unanchor_urb(urb); + usb_free_coherent(dev->udev, + KVASER_USB_RX_BUFFER_SIZE, buf, + buf_dma); + usb_free_urb(urb); + break; + } + + dev->rxbuf[i] = buf; + dev->rxbuf_dma[i] = buf_dma; + + usb_free_urb(urb); + } + + if (i == 0) { + dev_warn(&dev->intf->dev, "Cannot setup read URBs, error %d\n", + err); + return err; + } else if (i < KVASER_USB_MAX_RX_URBS) { + dev_warn(&dev->intf->dev, "RX performances may be slow\n"); + } + + dev->rxinitdone = true; + + return 0; +} + +static int kvaser_usb_open(struct net_device *netdev) +{ + struct kvaser_usb_net_priv *priv = netdev_priv(netdev); + struct kvaser_usb *dev = priv->dev; + int err; + + err = open_candev(netdev); + if (err) + return err; + + err = kvaser_usb_setup_rx_urbs(dev); + if (err) + goto error; + + err = dev->ops->dev_set_opt_mode(priv); + if (err) + goto error; + + err = dev->ops->dev_start_chip(priv); + if (err) { + netdev_warn(netdev, "Cannot start device, error %d\n", err); + goto error; + } + + priv->can.state = CAN_STATE_ERROR_ACTIVE; + + return 0; + +error: + close_candev(netdev); + return err; +} + +static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv) +{ + int i, max_tx_urbs; + + max_tx_urbs = priv->dev->max_tx_urbs; + + priv->active_tx_contexts = 0; + for (i = 0; i < max_tx_urbs; i++) + priv->tx_contexts[i].echo_index = max_tx_urbs; +} + +/* This method might sleep. Do not call it in the atomic context + * of URB completions. + */ +static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv) +{ + usb_kill_anchored_urbs(&priv->tx_submitted); + kvaser_usb_reset_tx_urb_contexts(priv); +} + +static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev) +{ + int i; + + usb_kill_anchored_urbs(&dev->rx_submitted); + + for (i = 0; i < KVASER_USB_MAX_RX_URBS; i++) + usb_free_coherent(dev->udev, KVASER_USB_RX_BUFFER_SIZE, + dev->rxbuf[i], dev->rxbuf_dma[i]); + + for (i = 0; i < dev->nchannels; i++) { + struct kvaser_usb_net_priv *priv = dev->nets[i]; + + if (priv) + kvaser_usb_unlink_tx_urbs(priv); + } +} + +static int kvaser_usb_close(struct net_device *netdev) +{ + struct kvaser_usb_net_priv *priv = netdev_priv(netdev); + struct kvaser_usb *dev = priv->dev; + int err; + + netif_stop_queue(netdev); + + err = dev->ops->dev_flush_queue(priv); + if (err) + netdev_warn(netdev, "Cannot flush queue, error %d\n", err); + + if (dev->ops->dev_reset_chip) { + err = dev->ops->dev_reset_chip(dev, priv->channel); + if (err) + netdev_warn(netdev, "Cannot reset card, error %d\n", + err); + } + + err = dev->ops->dev_stop_chip(priv); + if (err) + netdev_warn(netdev, "Cannot stop device, error %d\n", err); + + /* reset tx contexts */ + kvaser_usb_unlink_tx_urbs(priv); + + priv->can.state = CAN_STATE_STOPPED; + close_candev(priv->netdev); + + return 0; +} + +static void kvaser_usb_write_bulk_callback(struct urb *urb) +{ + struct kvaser_usb_tx_urb_context *context = urb->context; + struct kvaser_usb_net_priv *priv; + struct net_device *netdev; + + if (WARN_ON(!context)) + return; + + priv = context->priv; + netdev = priv->netdev; + + kfree(urb->transfer_buffer); + + if (!netif_device_present(netdev)) + return; + + if (urb->status) + netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); +} + +static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb, + struct net_device *netdev) +{ + struct kvaser_usb_net_priv *priv = netdev_priv(netdev); + struct kvaser_usb *dev = priv->dev; + struct net_device_stats *stats = &netdev->stats; + struct kvaser_usb_tx_urb_context *context = NULL; + struct urb *urb; + void *buf; + int cmd_len = 0; + int err, ret = NETDEV_TX_OK; + unsigned int i; + unsigned long flags; + + if (can_dropped_invalid_skb(netdev, skb)) + return NETDEV_TX_OK; + + urb = usb_alloc_urb(0, GFP_ATOMIC); + if (!urb) { + stats->tx_dropped++; + dev_kfree_skb(skb); + return NETDEV_TX_OK; + } + + spin_lock_irqsave(&priv->tx_contexts_lock, flags); + for (i = 0; i < dev->max_tx_urbs; i++) { + if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) { + context = &priv->tx_contexts[i]; + + context->echo_index = i; + can_put_echo_skb(skb, netdev, context->echo_index); + ++priv->active_tx_contexts; + if (priv->active_tx_contexts >= (int)dev->max_tx_urbs) + netif_stop_queue(netdev); + + break; + } + } + spin_unlock_irqrestore(&priv->tx_contexts_lock, flags); + + /* This should never happen; it implies a flow control bug */ + if (!context) { + netdev_warn(netdev, "cannot find free context\n"); + + ret = NETDEV_TX_BUSY; + goto freeurb; + } + + buf = dev->ops->dev_frame_to_cmd(priv, skb, &context->dlc, &cmd_len, + context->echo_index); + if (!buf) { + stats->tx_dropped++; + dev_kfree_skb(skb); + spin_lock_irqsave(&priv->tx_contexts_lock, flags); + + can_free_echo_skb(netdev, context->echo_index); + context->echo_index = dev->max_tx_urbs; + --priv->active_tx_contexts; + netif_wake_queue(netdev); + + spin_unlock_irqrestore(&priv->tx_contexts_lock, flags); + goto freeurb; + } + + context->priv = priv; + + usb_fill_bulk_urb(urb, dev->udev, + usb_sndbulkpipe(dev->udev, + dev->bulk_out->bEndpointAddress), + buf, cmd_len, kvaser_usb_write_bulk_callback, + context); + usb_anchor_urb(urb, &priv->tx_submitted); + + err = usb_submit_urb(urb, GFP_ATOMIC); + if (unlikely(err)) { + spin_lock_irqsave(&priv->tx_contexts_lock, flags); + + can_free_echo_skb(netdev, context->echo_index); + context->echo_index = dev->max_tx_urbs; + --priv->active_tx_contexts; + netif_wake_queue(netdev); + + spin_unlock_irqrestore(&priv->tx_contexts_lock, flags); + + usb_unanchor_urb(urb); + kfree(buf); + + stats->tx_dropped++; + + if (err == -ENODEV) + netif_device_detach(netdev); + else + netdev_warn(netdev, "Failed tx_urb %d\n", err); + + goto freeurb; + } + + ret = NETDEV_TX_OK; + +freeurb: + usb_free_urb(urb); + return ret; +} + +static const struct net_device_ops kvaser_usb_netdev_ops = { + .ndo_open = kvaser_usb_open, + .ndo_stop = kvaser_usb_close, + .ndo_start_xmit = kvaser_usb_start_xmit, + .ndo_change_mtu = can_change_mtu, +}; + +static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev) +{ + int i; + + for (i = 0; i < dev->nchannels; i++) { + if (!dev->nets[i]) + continue; + + unregister_candev(dev->nets[i]->netdev); + } + + kvaser_usb_unlink_all_urbs(dev); + + for (i = 0; i < dev->nchannels; i++) { + if (!dev->nets[i]) + continue; + + free_candev(dev->nets[i]->netdev); + } +} + +static int kvaser_usb_init_one(struct kvaser_usb *dev, + const struct usb_device_id *id, int channel) +{ + struct net_device *netdev; + struct kvaser_usb_net_priv *priv; + int err; + + if (dev->ops->dev_reset_chip) { + err = dev->ops->dev_reset_chip(dev, channel); + if (err) + return err; + } + + netdev = alloc_candev(sizeof(*priv) + + dev->max_tx_urbs * sizeof(*priv->tx_contexts), + dev->max_tx_urbs); + if (!netdev) { + dev_err(&dev->intf->dev, "Cannot alloc candev\n"); + return -ENOMEM; + } + + priv = netdev_priv(netdev); + + init_usb_anchor(&priv->tx_submitted); + init_completion(&priv->start_comp); + init_completion(&priv->stop_comp); + priv->can.ctrlmode_supported = 0; + + priv->dev = dev; + priv->netdev = netdev; + priv->channel = channel; + + spin_lock_init(&priv->tx_contexts_lock); + kvaser_usb_reset_tx_urb_contexts(priv); + + priv->can.state = CAN_STATE_STOPPED; + priv->can.clock.freq = dev->cfg->clock.freq; + priv->can.bittiming_const = dev->cfg->bittiming_const; + priv->can.do_set_bittiming = dev->ops->dev_set_bittiming; + priv->can.do_set_mode = dev->ops->dev_set_mode; + if ((id->driver_info & KVASER_USB_HAS_TXRX_ERRORS) || + (priv->dev->card_data.capabilities & KVASER_USB_CAP_BERR_CAP)) + priv->can.do_get_berr_counter = dev->ops->dev_get_berr_counter; + if (id->driver_info & KVASER_USB_HAS_SILENT_MODE) + priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY; + + priv->can.ctrlmode_supported |= dev->card_data.ctrlmode_supported; + + if (priv->can.ctrlmode_supported & CAN_CTRLMODE_FD) { + priv->can.data_bittiming_const = dev->cfg->data_bittiming_const; + priv->can.do_set_data_bittiming = + dev->ops->dev_set_data_bittiming; + } + + netdev->flags |= IFF_ECHO; + + netdev->netdev_ops = &kvaser_usb_netdev_ops; + + SET_NETDEV_DEV(netdev, &dev->intf->dev); + netdev->dev_id = channel; + + dev->nets[channel] = priv; + + err = register_candev(netdev); + if (err) { + dev_err(&dev->intf->dev, "Failed to register CAN device\n"); + free_candev(netdev); + dev->nets[channel] = NULL; + return err; + } + + netdev_dbg(netdev, "device registered\n"); + + return 0; +} + +static int kvaser_usb_probe(struct usb_interface *intf, + const struct usb_device_id *id) +{ + struct kvaser_usb *dev; + int err; + int i; + + dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL); + if (!dev) + return -ENOMEM; + + if (kvaser_is_leaf(id)) { + dev->card_data.leaf.family = KVASER_LEAF; + dev->ops = &kvaser_usb_leaf_dev_ops; + } else if (kvaser_is_usbcan(id)) { + dev->card_data.leaf.family = KVASER_USBCAN; + dev->ops = &kvaser_usb_leaf_dev_ops; + } else if (kvaser_is_hydra(id)) { + dev->ops = &kvaser_usb_hydra_dev_ops; + } else { + dev_err(&intf->dev, + "Product ID (%d) is not a supported Kvaser USB device\n", + id->idProduct); + return -ENODEV; + } + + dev->intf = intf; + + err = dev->ops->dev_setup_endpoints(dev); + if (err) { + dev_err(&intf->dev, "Cannot get usb endpoint(s)"); + return err; + } + + dev->udev = interface_to_usbdev(intf); + + init_usb_anchor(&dev->rx_submitted); + + usb_set_intfdata(intf, dev); + + dev->card_data.ctrlmode_supported = 0; + dev->card_data.capabilities = 0; + err = dev->ops->dev_init_card(dev); + if (err) { + dev_err(&intf->dev, + "Failed to initialize card, error %d\n", err); + return err; + } + + err = dev->ops->dev_get_software_info(dev); + if (err) { + dev_err(&intf->dev, + "Cannot get software info, error %d\n", err); + return err; + } + + if (dev->ops->dev_get_software_details) { + err = dev->ops->dev_get_software_details(dev); + if (err) { + dev_err(&intf->dev, + "Cannot get software details, error %d\n", err); + return err; + } + } + + if (WARN_ON(!dev->cfg)) + return -ENODEV; + + dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n", + ((dev->fw_version >> 24) & 0xff), + ((dev->fw_version >> 16) & 0xff), + (dev->fw_version & 0xffff)); + + dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs); + + err = dev->ops->dev_get_card_info(dev); + if (err) { + dev_err(&intf->dev, "Cannot get card info, error %d\n", err); + return err; + } + + if (dev->ops->dev_get_capabilities) { + err = dev->ops->dev_get_capabilities(dev); + if (err) { + dev_err(&intf->dev, + "Cannot get capabilities, error %d\n", err); + kvaser_usb_remove_interfaces(dev); + return err; + } + } + + for (i = 0; i < dev->nchannels; i++) { + err = kvaser_usb_init_one(dev, id, i); + if (err) { + kvaser_usb_remove_interfaces(dev); + return err; + } + } + + return 0; +} + +static void kvaser_usb_disconnect(struct usb_interface *intf) +{ + struct kvaser_usb *dev = usb_get_intfdata(intf); + + usb_set_intfdata(intf, NULL); + + if (!dev) + return; + + kvaser_usb_remove_interfaces(dev); +} + +static struct usb_driver kvaser_usb_driver = { + .name = "kvaser_usb", + .probe = kvaser_usb_probe, + .disconnect = kvaser_usb_disconnect, + .id_table = kvaser_usb_table, +}; + +module_usb_driver(kvaser_usb_driver); + +MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>"); +MODULE_AUTHOR("Kvaser AB <support@kvaser.com>"); +MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices"); +MODULE_LICENSE("GPL v2"); |