Hi linux-usb folks, Is there someone who can help me to fix the following errors? smatch warnings: + drivers/net/can/usb/kvaser_usb.c:431 kvaser_usb_send_simple_msg() error: doing +dma on the stack ((null)) + drivers/net/can/usb/kvaser_usb.c:1073 kvaser_usb_set_opt_mode() error: doing +dma on the stack ((null)) + drivers/net/can/usb/kvaser_usb.c:1174 kvaser_usb_flush_queue() error: doing +dma on the stack ((null)) + drivers/net/can/usb/kvaser_usb.c:1384 kvaser_usb_set_bittiming() error: doing +dma on the stack ((null)) I assume it's due to the buffer I pass to the function usb_bulk_msg() which is on the stack and can't be. Do I just have to kmalloc a buffer and give it to the usb_bulk_msg() function? That's what I understood by reading "Documentation/DMA-API-HOWTO.txt" section "What memory is DMA'able?"... and from commit http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=32ec4576c3fb37316b1d11a04b220527822f3f0d Thanks, Olivier On Wed, Nov 21, 2012 at 08:11:13AM +0100, Olivier Sobrie wrote: > This driver provides support for several Kvaser CAN/USB devices. > Such kind of devices supports up to three CAN network interfaces. > > It has been tested with a Kvaser USB Leaf Light (one network interface) > connected to a pch_can interface. > The firmware version of the Kvaser device was 2.5.205. > > List of Kvaser devices supported by the driver: > - Kvaser Leaf Light > - Kvaser Leaf Professional HS > - Kvaser Leaf SemiPro HS > - Kvaser Leaf Professional LS > - Kvaser Leaf Professional SWC > - Kvaser Leaf Professional LIN > - Kvaser Leaf SemiPro LS > - Kvaser Leaf SemiPro SWC > - Kvaser Memorator II HS/HS > - Kvaser USBcan Professional HS/HS > - Kvaser Leaf Light GI > - Kvaser Leaf Professional HS (OBD-II connector) > - Kvaser Memorator Professional HS/LS > - Kvaser Leaf Light "China" > - Kvaser BlackBird SemiPro > - Kvaser USBcan R > > Signed-off-by: Daniel Berglund <db@xxxxxxxxxx> > Signed-off-by: Olivier Sobrie <olivier@xxxxxxxxx> > --- > Hi, > > This version includes the last changes requested by Marc on version 5 of > the patch. > > Olivier > > drivers/net/can/usb/Kconfig | 29 + > drivers/net/can/usb/Makefile | 1 + > drivers/net/can/usb/kvaser_usb.c | 1598 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 1628 insertions(+) > create mode 100644 drivers/net/can/usb/kvaser_usb.c > > diff --git a/drivers/net/can/usb/Kconfig b/drivers/net/can/usb/Kconfig > index 0a68768..a4e4bee 100644 > --- a/drivers/net/can/usb/Kconfig > +++ b/drivers/net/can/usb/Kconfig > @@ -13,6 +13,35 @@ config CAN_ESD_USB2 > This driver supports the CAN-USB/2 interface > from esd electronic system design gmbh (http://www.esd.eu). > > +config CAN_KVASER_USB > + tristate "Kvaser CAN/USB interface" > + ---help--- > + This driver adds support for Kvaser CAN/USB devices like Kvaser > + Leaf Light. > + > + The driver gives support for the following devices: > + - Kvaser Leaf Light > + - Kvaser Leaf Professional HS > + - Kvaser Leaf SemiPro HS > + - Kvaser Leaf Professional LS > + - Kvaser Leaf Professional SWC > + - Kvaser Leaf Professional LIN > + - Kvaser Leaf SemiPro LS > + - Kvaser Leaf SemiPro SWC > + - Kvaser Memorator II HS/HS > + - Kvaser USBcan Professional HS/HS > + - Kvaser Leaf Light GI > + - Kvaser Leaf Professional HS (OBD-II connector) > + - Kvaser Memorator Professional HS/LS > + - Kvaser Leaf Light "China" > + - Kvaser BlackBird SemiPro > + - Kvaser USBcan R > + > + If unsure, say N. > + > + To compile this driver as a module, choose M here: the > + module will be called kvaser_usb. > + > config CAN_PEAK_USB > tristate "PEAK PCAN-USB/USB Pro interfaces" > ---help--- > diff --git a/drivers/net/can/usb/Makefile b/drivers/net/can/usb/Makefile > index da6d1d3..80a2ee4 100644 > --- a/drivers/net/can/usb/Makefile > +++ b/drivers/net/can/usb/Makefile > @@ -4,6 +4,7 @@ > > 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/ > > ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG > diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c > new file mode 100644 > index 0000000..8807bf8 > --- /dev/null > +++ b/drivers/net/can/usb/kvaser_usb.c > @@ -0,0 +1,1598 @@ > +/* > + * 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. > + * > + * Parts of this driver are based on the following: > + * - Kvaser linux leaf driver (version 4.78) > + * - CAN driver for esd CAN-USB/2 > + * > + * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved. > + * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@xxxxxx>, esd gmbh > + * Copyright (C) 2012 Olivier Sobrie <olivier@xxxxxxxxx> > + */ > + > +#include <linux/init.h> > +#include <linux/completion.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> > + > +#define MAX_TX_URBS 16 > +#define MAX_RX_URBS 4 > +#define START_TIMEOUT 1000 /* msecs */ > +#define STOP_TIMEOUT 1000 /* msecs */ > +#define USB_SEND_TIMEOUT 1000 /* msecs */ > +#define USB_RECV_TIMEOUT 1000 /* msecs */ > +#define RX_BUFFER_SIZE 3072 > +#define CAN_USB_CLOCK 8000000 > +#define MAX_NET_DEVICES 3 > + > +/* Kvaser USB devices */ > +#define KVASER_VENDOR_ID 0x0bfd > +#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 > + > +/* USB devices features */ > +#define KVASER_HAS_SILENT_MODE BIT(0) > +#define KVASER_HAS_TXRX_ERRORS BIT(1) > + > +/* Message header size */ > +#define MSG_HEADER_LEN 2 > + > +/* Can message flags */ > +#define MSG_FLAG_ERROR_FRAME BIT(0) > +#define MSG_FLAG_OVERRUN BIT(1) > +#define MSG_FLAG_NERR BIT(2) > +#define MSG_FLAG_WAKEUP BIT(3) > +#define MSG_FLAG_REMOTE_FRAME BIT(4) > +#define MSG_FLAG_RESERVED BIT(5) > +#define MSG_FLAG_TX_ACK BIT(6) > +#define MSG_FLAG_TX_REQUEST BIT(7) > + > +/* Can states */ > +#define M16C_STATE_BUS_RESET BIT(0) > +#define M16C_STATE_BUS_ERROR BIT(4) > +#define M16C_STATE_BUS_PASSIVE BIT(5) > +#define M16C_STATE_BUS_OFF BIT(6) > + > +/* Can msg ids */ > +#define CMD_RX_STD_MESSAGE 12 > +#define CMD_TX_STD_MESSAGE 13 > +#define CMD_RX_EXT_MESSAGE 14 > +#define CMD_TX_EXT_MESSAGE 15 > +#define CMD_SET_BUS_PARAMS 16 > +#define CMD_GET_BUS_PARAMS 17 > +#define CMD_GET_BUS_PARAMS_REPLY 18 > +#define CMD_GET_CHIP_STATE 19 > +#define CMD_CHIP_STATE_EVENT 20 > +#define CMD_SET_CTRL_MODE 21 > +#define CMD_GET_CTRL_MODE 22 > +#define CMD_GET_CTRL_MODE_REPLY 23 > +#define CMD_RESET_CHIP 24 > +#define CMD_RESET_CARD 25 > +#define CMD_START_CHIP 26 > +#define CMD_START_CHIP_REPLY 27 > +#define CMD_STOP_CHIP 28 > +#define CMD_STOP_CHIP_REPLY 29 > +#define CMD_GET_CARD_INFO2 32 > +#define CMD_GET_CARD_INFO 34 > +#define CMD_GET_CARD_INFO_REPLY 35 > +#define CMD_GET_SOFTWARE_INFO 38 > +#define CMD_GET_SOFTWARE_INFO_REPLY 39 > +#define CMD_ERROR_EVENT 45 > +#define CMD_FLUSH_QUEUE 48 > +#define CMD_RESET_ERROR_COUNTER 49 > +#define CMD_TX_ACKNOWLEDGE 50 > +#define CMD_CAN_ERROR_EVENT 51 > +#define CMD_USB_THROTTLE 77 > +#define CMD_LOG_MESSAGE 106 > + > +/* error factors */ > +#define M16C_EF_ACKE BIT(0) > +#define M16C_EF_CRCE BIT(1) > +#define M16C_EF_FORME BIT(2) > +#define M16C_EF_STFE BIT(3) > +#define M16C_EF_BITE0 BIT(4) > +#define M16C_EF_BITE1 BIT(5) > +#define M16C_EF_RCVE BIT(6) > +#define M16C_EF_TRE BIT(7) > + > +/* bittiming parameters */ > +#define KVASER_USB_TSEG1_MIN 1 > +#define KVASER_USB_TSEG1_MAX 16 > +#define KVASER_USB_TSEG2_MIN 1 > +#define KVASER_USB_TSEG2_MAX 8 > +#define KVASER_USB_SJW_MAX 4 > +#define KVASER_USB_BRP_MIN 1 > +#define KVASER_USB_BRP_MAX 64 > +#define KVASER_USB_BRP_INC 1 > + > +/* ctrl modes */ > +#define KVASER_CTRL_MODE_NORMAL 1 > +#define KVASER_CTRL_MODE_SILENT 2 > +#define KVASER_CTRL_MODE_SELFRECEPTION 3 > +#define KVASER_CTRL_MODE_OFF 4 > + > +struct kvaser_msg_simple { > + u8 tid; > + u8 channel; > +} __packed; > + > +struct kvaser_msg_cardinfo { > + u8 tid; > + u8 nchannels; > + __le32 serial_number; > + __le32 padding; > + __le32 clock_resolution; > + __le32 mfgdate; > + u8 ean[8]; > + u8 hw_revision; > + u8 usb_hs_mode; > + __le16 padding2; > +} __packed; > + > +struct kvaser_msg_cardinfo2 { > + u8 tid; > + u8 channel; > + u8 pcb_id[24]; > + __le32 oem_unlock_code; > +} __packed; > + > +struct kvaser_msg_softinfo { > + u8 tid; > + u8 channel; > + __le32 sw_options; > + __le32 fw_version; > + __le16 max_outstanding_tx; > + __le16 padding[9]; > +} __packed; > + > +struct kvaser_msg_busparams { > + u8 tid; > + u8 channel; > + __le32 bitrate; > + u8 tseg1; > + u8 tseg2; > + u8 sjw; > + u8 no_samp; > +} __packed; > + > +struct kvaser_msg_tx_can { > + u8 channel; > + u8 tid; > + u8 msg[14]; > + u8 padding; > + u8 flags; > +} __packed; > + > +struct kvaser_msg_rx_can { > + u8 channel; > + u8 flag; > + __le16 time[3]; > + u8 msg[14]; > +} __packed; > + > +struct kvaser_msg_chip_state_event { > + u8 tid; > + u8 channel; > + __le16 time[3]; > + u8 tx_errors_count; > + u8 rx_errors_count; > + u8 status; > + u8 padding[3]; > +} __packed; > + > +struct kvaser_msg_tx_acknowledge { > + u8 channel; > + u8 tid; > + __le16 time[3]; > + u8 flags; > + u8 time_offset; > +} __packed; > + > +struct kvaser_msg_error_event { > + u8 tid; > + u8 flags; > + __le16 time[3]; > + u8 channel; > + u8 padding; > + u8 tx_errors_count; > + u8 rx_errors_count; > + u8 status; > + u8 error_factor; > +} __packed; > + > +struct kvaser_msg_ctrl_mode { > + u8 tid; > + u8 channel; > + u8 ctrl_mode; > + u8 padding[3]; > +} __packed; > + > +struct kvaser_msg_flush_queue { > + u8 tid; > + u8 channel; > + u8 flags; > + u8 padding[3]; > +} __packed; > + > +struct kvaser_msg_log_message { > + u8 channel; > + u8 flags; > + __le16 time[3]; > + u8 dlc; > + u8 time_offset; > + __le32 id; > + u8 data[8]; > +} __packed; > + > +struct kvaser_msg { > + u8 len; > + u8 id; > + union { > + struct kvaser_msg_simple simple; > + struct kvaser_msg_cardinfo cardinfo; > + struct kvaser_msg_cardinfo2 cardinfo2; > + struct kvaser_msg_softinfo softinfo; > + struct kvaser_msg_busparams busparams; > + struct kvaser_msg_tx_can tx_can; > + struct kvaser_msg_rx_can rx_can; > + struct kvaser_msg_chip_state_event chip_state_event; > + struct kvaser_msg_tx_acknowledge tx_acknowledge; > + struct kvaser_msg_error_event error_event; > + struct kvaser_msg_ctrl_mode ctrl_mode; > + struct kvaser_msg_flush_queue flush_queue; > + struct kvaser_msg_log_message log_message; > + } u; > +} __packed; > + > +struct kvaser_usb_tx_urb_context { > + struct kvaser_usb_net_priv *priv; > + u32 echo_index; > + int dlc; > +}; > + > +struct kvaser_usb { > + struct usb_device *udev; > + struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES]; > + > + struct usb_endpoint_descriptor *bulk_in, *bulk_out; > + struct usb_anchor rx_submitted; > + > + u32 fw_version; > + unsigned int nchannels; > + > + bool rxinitdone; > + void *rxbuf[MAX_RX_URBS]; > + dma_addr_t rxbuf_dma[MAX_RX_URBS]; > +}; > + > +struct kvaser_usb_net_priv { > + struct can_priv can; > + > + atomic_t active_tx_urbs; > + struct usb_anchor tx_submitted; > + struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS]; > + > + struct completion start_comp, stop_comp; > + > + struct kvaser_usb *dev; > + struct net_device *netdev; > + int channel; > + > + struct can_berr_counter bec; > +}; > + > +static struct usb_device_id kvaser_usb_table[] = { > + { 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_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID), > + .driver_info = KVASER_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_HAS_TXRX_ERRORS | > + KVASER_HAS_SILENT_MODE }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS }, > + { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID), > + .driver_info = KVASER_HAS_TXRX_ERRORS }, > + { } > +}; > +MODULE_DEVICE_TABLE(usb, kvaser_usb_table); > + > +static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev, > + struct kvaser_msg *msg) > +{ > + int actual_len; > + > + return usb_bulk_msg(dev->udev, > + usb_sndbulkpipe(dev->udev, > + dev->bulk_out->bEndpointAddress), > + msg, msg->len, &actual_len, > + USB_SEND_TIMEOUT); > +} > + > +static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id, > + struct kvaser_msg *msg) > +{ > + struct kvaser_msg *tmp; > + void *buf; > + int actual_len; > + int err; > + int pos = 0; > + > + buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL); > + if (!buf) > + return -ENOMEM; > + > + err = usb_bulk_msg(dev->udev, > + usb_rcvbulkpipe(dev->udev, > + dev->bulk_in->bEndpointAddress), > + buf, RX_BUFFER_SIZE, &actual_len, > + USB_RECV_TIMEOUT); > + if (err < 0) > + goto end; > + > + while (pos <= actual_len - MSG_HEADER_LEN) { > + tmp = buf + pos; > + > + if (!tmp->len) > + break; > + > + if (pos + tmp->len > actual_len) { > + dev_err(dev->udev->dev.parent, "Format error\n"); > + break; > + } > + > + if (tmp->id == id) { > + memcpy(msg, tmp, tmp->len); > + goto end; > + } > + > + pos += tmp->len; > + } > + > + err = -EINVAL; > + > +end: > + kfree(buf); > + > + return err; > +} > + > +static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev, > + u8 msg_id, int channel) > +{ > + struct kvaser_msg msg = { > + .len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple), > + .id = msg_id, > + .u.simple.channel = channel, > + .u.simple.tid = 0xff, > + }; > + > + return kvaser_usb_send_msg(dev, &msg); > +} > + > +static int kvaser_usb_get_software_info(struct kvaser_usb *dev) > +{ > + struct kvaser_msg msg; > + int err; > + > + err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0); > + if (err) > + return err; > + > + err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg); > + if (err) > + return err; > + > + dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version); > + > + return 0; > +} > + > +static int kvaser_usb_get_card_info(struct kvaser_usb *dev) > +{ > + struct kvaser_msg msg; > + int err; > + > + err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0); > + if (err) > + return err; > + > + err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg); > + if (err) > + return err; > + > + dev->nchannels = msg.u.cardinfo.nchannels; > + > + return 0; > +} > + > +static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev, > + const struct kvaser_msg *msg) > +{ > + struct net_device_stats *stats; > + struct kvaser_usb_tx_urb_context *context; > + struct kvaser_usb_net_priv *priv; > + struct sk_buff *skb; > + struct can_frame *cf; > + u8 channel = msg->u.tx_acknowledge.channel; > + u8 tid = msg->u.tx_acknowledge.tid; > + > + if (channel >= dev->nchannels) { > + dev_err(dev->udev->dev.parent, > + "Invalid channel number (%d)\n", channel); > + return; > + } > + > + priv = dev->nets[channel]; > + > + if (!netif_device_present(priv->netdev)) > + return; > + > + stats = &priv->netdev->stats; > + > + context = &priv->tx_contexts[tid % MAX_TX_URBS]; > + > + /* Sometimes the state change doesn't come after a bus-off event */ > + if (priv->can.restart_ms && > + (priv->can.state >= CAN_STATE_BUS_OFF)) { > + skb = alloc_can_err_skb(priv->netdev, &cf); > + if (skb) { > + cf->can_id |= CAN_ERR_RESTARTED; > + netif_rx(skb); > + > + stats->rx_packets++; > + stats->rx_bytes += cf->can_dlc; > + } else { > + netdev_err(priv->netdev, > + "No memory left for err_skb\n"); > + } > + > + priv->can.can_stats.restarts++; > + netif_carrier_on(priv->netdev); > + > + priv->can.state = CAN_STATE_ERROR_ACTIVE; > + } > + > + stats->tx_packets++; > + stats->tx_bytes += context->dlc; > + can_get_echo_skb(priv->netdev, context->echo_index); > + > + context->echo_index = MAX_TX_URBS; > + atomic_dec(&priv->active_tx_urbs); > + > + netif_wake_queue(priv->netdev); > +} > + > +static void kvaser_usb_simple_msg_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); > +} > + > +static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv, > + u8 msg_id) > +{ > + struct kvaser_usb *dev = priv->dev; > + struct net_device *netdev = priv->netdev; > + struct kvaser_msg *msg; > + struct urb *urb; > + void *buf; > + int err; > + > + urb = usb_alloc_urb(0, GFP_ATOMIC); > + if (!urb) { > + netdev_err(netdev, "No memory left for URBs\n"); > + return -ENOMEM; > + } > + > + buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC); > + if (!buf) { > + netdev_err(netdev, "No memory left for USB buffer\n"); > + usb_free_urb(urb); > + return -ENOMEM; > + } > + > + msg = (struct kvaser_msg *)buf; > + msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple); > + msg->id = msg_id; > + msg->u.simple.channel = priv->channel; > + > + usb_fill_bulk_urb(urb, dev->udev, > + usb_sndbulkpipe(dev->udev, > + dev->bulk_out->bEndpointAddress), > + buf, msg->len, > + kvaser_usb_simple_msg_callback, priv); > + 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); > + kfree(buf); > + return err; > + } > + > + usb_free_urb(urb); > + > + return 0; > +} > + > +static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv) > +{ > + int i; > + > + 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; > +} > + > +static void kvaser_usb_rx_error(const struct kvaser_usb *dev, > + const struct kvaser_msg *msg) > +{ > + struct can_frame *cf; > + struct sk_buff *skb; > + struct net_device_stats *stats; > + struct kvaser_usb_net_priv *priv; > + unsigned int new_state; > + u8 channel, status, txerr, rxerr, error_factor; > + > + switch (msg->id) { > + case CMD_CAN_ERROR_EVENT: > + channel = msg->u.error_event.channel; > + status = msg->u.error_event.status; > + txerr = msg->u.error_event.tx_errors_count; > + rxerr = msg->u.error_event.rx_errors_count; > + error_factor = msg->u.error_event.error_factor; > + break; > + case CMD_LOG_MESSAGE: > + channel = msg->u.log_message.channel; > + status = msg->u.log_message.data[0]; > + txerr = msg->u.log_message.data[2]; > + rxerr = msg->u.log_message.data[3]; > + error_factor = msg->u.log_message.data[1]; > + break; > + case CMD_CHIP_STATE_EVENT: > + channel = msg->u.chip_state_event.channel; > + status = msg->u.chip_state_event.status; > + txerr = msg->u.chip_state_event.tx_errors_count; > + rxerr = msg->u.chip_state_event.rx_errors_count; > + error_factor = 0; > + break; > + default: > + dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n", > + msg->id); > + return; > + } > + > + if (channel >= dev->nchannels) { > + dev_err(dev->udev->dev.parent, > + "Invalid channel number (%d)\n", channel); > + return; > + } > + > + priv = dev->nets[channel]; > + stats = &priv->netdev->stats; > + > + if (status & M16C_STATE_BUS_RESET) { > + kvaser_usb_unlink_tx_urbs(priv); > + return; > + } > + > + skb = alloc_can_err_skb(priv->netdev, &cf); > + if (!skb) { > + stats->rx_dropped++; > + return; > + } > + > + new_state = priv->can.state; > + > + netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status); > + > + if (status & M16C_STATE_BUS_OFF) { > + cf->can_id |= CAN_ERR_BUSOFF; > + > + priv->can.can_stats.bus_off++; > + if (!priv->can.restart_ms) > + kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP); > + > + netif_carrier_off(priv->netdev); > + > + new_state = CAN_STATE_BUS_OFF; > + } else if (status & M16C_STATE_BUS_PASSIVE) { > + if (priv->can.state != CAN_STATE_ERROR_PASSIVE) { > + cf->can_id |= CAN_ERR_CRTL; > + > + if (txerr || rxerr) > + cf->data[1] = (txerr > rxerr) > + ? CAN_ERR_CRTL_TX_PASSIVE > + : CAN_ERR_CRTL_RX_PASSIVE; > + else > + cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE | > + CAN_ERR_CRTL_RX_PASSIVE; > + > + priv->can.can_stats.error_passive++; > + } > + > + new_state = CAN_STATE_ERROR_PASSIVE; > + } > + > + if (status == M16C_STATE_BUS_ERROR) { > + if ((priv->can.state < CAN_STATE_ERROR_WARNING) && > + ((txerr >= 96) || (rxerr >= 96))) { > + cf->can_id |= CAN_ERR_CRTL; > + cf->data[1] = (txerr > rxerr) > + ? CAN_ERR_CRTL_TX_WARNING > + : CAN_ERR_CRTL_RX_WARNING; > + > + priv->can.can_stats.error_warning++; > + new_state = CAN_STATE_ERROR_WARNING; > + } else if (priv->can.state > CAN_STATE_ERROR_ACTIVE) { > + cf->can_id |= CAN_ERR_PROT; > + cf->data[2] = CAN_ERR_PROT_ACTIVE; > + > + new_state = CAN_STATE_ERROR_ACTIVE; > + } > + } > + > + if (!status) { > + cf->can_id |= CAN_ERR_PROT; > + cf->data[2] = CAN_ERR_PROT_ACTIVE; > + > + new_state = CAN_STATE_ERROR_ACTIVE; > + } > + > + if (priv->can.restart_ms && > + (priv->can.state >= CAN_STATE_BUS_OFF) && > + (new_state < CAN_STATE_BUS_OFF)) { > + cf->can_id |= CAN_ERR_RESTARTED; > + netif_carrier_on(priv->netdev); > + > + priv->can.can_stats.restarts++; > + } > + > + if (error_factor) { > + priv->can.can_stats.bus_error++; > + stats->rx_errors++; > + > + cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT; > + > + if (error_factor & M16C_EF_ACKE) > + cf->data[3] |= (CAN_ERR_PROT_LOC_ACK); > + if (error_factor & M16C_EF_CRCE) > + cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ | > + CAN_ERR_PROT_LOC_CRC_DEL); > + if (error_factor & M16C_EF_FORME) > + cf->data[2] |= CAN_ERR_PROT_FORM; > + if (error_factor & M16C_EF_STFE) > + cf->data[2] |= CAN_ERR_PROT_STUFF; > + if (error_factor & M16C_EF_BITE0) > + cf->data[2] |= CAN_ERR_PROT_BIT0; > + if (error_factor & M16C_EF_BITE1) > + cf->data[2] |= CAN_ERR_PROT_BIT1; > + if (error_factor & M16C_EF_TRE) > + cf->data[2] |= CAN_ERR_PROT_TX; > + } > + > + cf->data[6] = txerr; > + cf->data[7] = rxerr; > + > + priv->bec.txerr = txerr; > + priv->bec.rxerr = rxerr; > + > + priv->can.state = new_state; > + > + netif_rx(skb); > + > + stats->rx_packets++; > + stats->rx_bytes += cf->can_dlc; > +} > + > +static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv, > + const struct kvaser_msg *msg) > +{ > + struct can_frame *cf; > + struct sk_buff *skb; > + struct net_device_stats *stats = &priv->netdev->stats; > + > + if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME | > + MSG_FLAG_NERR)) { > + netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n", > + msg->u.rx_can.flag); > + > + stats->rx_errors++; > + return; > + } > + > + if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) { > + skb = alloc_can_err_skb(priv->netdev, &cf); > + if (!skb) { > + stats->rx_dropped++; > + return; > + } > + > + cf->can_id |= CAN_ERR_CRTL; > + cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW; > + > + stats->rx_over_errors++; > + stats->rx_errors++; > + > + netif_rx(skb); > + > + stats->rx_packets++; > + stats->rx_bytes += cf->can_dlc; > + } > +} > + > +static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev, > + const struct kvaser_msg *msg) > +{ > + struct kvaser_usb_net_priv *priv; > + struct can_frame *cf; > + struct sk_buff *skb; > + struct net_device_stats *stats; > + u8 channel = msg->u.rx_can.channel; > + > + if (channel >= dev->nchannels) { > + dev_err(dev->udev->dev.parent, > + "Invalid channel number (%d)\n", channel); > + return; > + } > + > + priv = dev->nets[channel]; > + stats = &priv->netdev->stats; > + > + if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME | MSG_FLAG_NERR | > + MSG_FLAG_OVERRUN)) { > + kvaser_usb_rx_can_err(priv, msg); > + return; > + } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) { > + netdev_warn(priv->netdev, > + "Unhandled frame (flags: 0x%02x)", > + msg->u.rx_can.flag); > + return; > + } > + > + skb = alloc_can_skb(priv->netdev, &cf); > + if (!skb) { > + stats->tx_dropped++; > + return; > + } > + > + cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) | > + (msg->u.rx_can.msg[1] & 0x3f); > + cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]); > + > + if (msg->id == CMD_RX_EXT_MESSAGE) { > + cf->can_id <<= 18; > + cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) | > + ((msg->u.rx_can.msg[3] & 0xff) << 6) | > + (msg->u.rx_can.msg[4] & 0x3f); > + cf->can_id |= CAN_EFF_FLAG; > + } > + > + if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME) > + cf->can_id |= CAN_RTR_FLAG; > + else > + memcpy(cf->data, &msg->u.rx_can.msg[6], cf->can_dlc); > + > + netif_rx(skb); > + > + stats->rx_packets++; > + stats->rx_bytes += cf->can_dlc; > +} > + > +static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev, > + const struct kvaser_msg *msg) > +{ > + struct kvaser_usb_net_priv *priv; > + u8 channel = msg->u.simple.channel; > + > + if (channel >= dev->nchannels) { > + dev_err(dev->udev->dev.parent, > + "Invalid channel number (%d)\n", channel); > + return; > + } > + > + priv = dev->nets[channel]; > + > + if (completion_done(&priv->start_comp) && > + netif_queue_stopped(priv->netdev)) { > + netif_wake_queue(priv->netdev); > + } else { > + netif_start_queue(priv->netdev); > + complete(&priv->start_comp); > + } > +} > + > +static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev, > + const struct kvaser_msg *msg) > +{ > + struct kvaser_usb_net_priv *priv; > + u8 channel = msg->u.simple.channel; > + > + if (channel >= dev->nchannels) { > + dev_err(dev->udev->dev.parent, > + "Invalid channel number (%d)\n", channel); > + return; > + } > + > + priv = dev->nets[channel]; > + > + complete(&priv->stop_comp); > +} > + > +static void kvaser_usb_handle_message(const struct kvaser_usb *dev, > + const struct kvaser_msg *msg) > +{ > + switch (msg->id) { > + case CMD_START_CHIP_REPLY: > + kvaser_usb_start_chip_reply(dev, msg); > + break; > + > + case CMD_STOP_CHIP_REPLY: > + kvaser_usb_stop_chip_reply(dev, msg); > + break; > + > + case CMD_RX_STD_MESSAGE: > + case CMD_RX_EXT_MESSAGE: > + kvaser_usb_rx_can_msg(dev, msg); > + break; > + > + case CMD_CHIP_STATE_EVENT: > + case CMD_CAN_ERROR_EVENT: > + kvaser_usb_rx_error(dev, msg); > + break; > + > + case CMD_LOG_MESSAGE: > + if (msg->u.log_message.flags & MSG_FLAG_ERROR_FRAME) > + kvaser_usb_rx_error(dev, msg); > + break; > + > + case CMD_TX_ACKNOWLEDGE: > + kvaser_usb_tx_acknowledge(dev, msg); > + break; > + > + default: > + dev_warn(dev->udev->dev.parent, > + "Unhandled message (%d)\n", msg->id); > + break; > + } > +} > + > +static void kvaser_usb_read_bulk_callback(struct urb *urb) > +{ > + struct kvaser_usb *dev = urb->context; > + struct kvaser_msg *msg; > + int pos = 0; > + int err, i; > + > + switch (urb->status) { > + case 0: > + break; > + case -ENOENT: > + case -ESHUTDOWN: > + return; > + default: > + dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n", > + urb->status); > + goto resubmit_urb; > + } > + > + while (pos <= urb->actual_length - MSG_HEADER_LEN) { > + msg = urb->transfer_buffer + pos; > + > + if (!msg->len) > + break; > + > + if (pos + msg->len > urb->actual_length) { > + dev_err(dev->udev->dev.parent, "Format error\n"); > + break; > + } > + > + kvaser_usb_handle_message(dev, msg); > + > + pos += msg->len; > + } > + > +resubmit_urb: > + usb_fill_bulk_urb(urb, dev->udev, > + usb_rcvbulkpipe(dev->udev, > + dev->bulk_in->bEndpointAddress), > + urb->transfer_buffer, 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->udev->dev.parent, > + "Failed resubmitting read bulk urb: %d\n", err); > + } > + > + return; > +} > + > +static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev) > +{ > + int i, err = 0; > + > + if (dev->rxinitdone) > + return 0; > + > + for (i = 0; i < 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) { > + dev_warn(dev->udev->dev.parent, > + "No memory left for URBs\n"); > + err = -ENOMEM; > + break; > + } > + > + buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE, > + GFP_KERNEL, &buf_dma); > + if (!buf) { > + dev_warn(dev->udev->dev.parent, > + "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, 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, 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->udev->dev.parent, > + "Cannot setup read URBs, error %d\n", err); > + return err; > + } else if (i < MAX_RX_URBS) { > + dev_warn(dev->udev->dev.parent, > + "RX performances may be slow\n"); > + } > + > + dev->rxinitdone = true; > + > + return 0; > +} > + > +static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv) > +{ > + struct kvaser_msg msg = { > + .id = CMD_SET_CTRL_MODE, > + .len = MSG_HEADER_LEN + > + sizeof(struct kvaser_msg_ctrl_mode), > + .u.ctrl_mode.tid = 0xff, > + .u.ctrl_mode.channel = priv->channel, > + }; > + > + if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) > + msg.u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT; > + else > + msg.u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL; > + > + return kvaser_usb_send_msg(priv->dev, &msg); > +} > + > +static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv) > +{ > + int err; > + > + init_completion(&priv->start_comp); > + > + err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP, > + priv->channel); > + if (err) > + return err; > + > + if (!wait_for_completion_timeout(&priv->start_comp, > + msecs_to_jiffies(START_TIMEOUT))) > + return -ETIMEDOUT; > + > + 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 = kvaser_usb_set_opt_mode(priv); > + if (err) > + goto error; > + > + err = kvaser_usb_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_unlink_all_urbs(struct kvaser_usb *dev) > +{ > + int i; > + > + usb_kill_anchored_urbs(&dev->rx_submitted); > + > + for (i = 0; i < MAX_RX_URBS; i++) > + usb_free_coherent(dev->udev, RX_BUFFER_SIZE, > + dev->rxbuf[i], > + dev->rxbuf_dma[i]); > + > + for (i = 0; i < MAX_NET_DEVICES; i++) { > + struct kvaser_usb_net_priv *priv = dev->nets[i]; > + > + if (priv) > + kvaser_usb_unlink_tx_urbs(priv); > + } > +} > + > +static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv) > +{ > + int err; > + > + init_completion(&priv->stop_comp); > + > + err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP, > + priv->channel); > + if (err) > + return err; > + > + if (!wait_for_completion_timeout(&priv->stop_comp, > + msecs_to_jiffies(STOP_TIMEOUT))) > + return -ETIMEDOUT; > + > + return 0; > +} > + > +static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv) > +{ > + struct kvaser_msg msg = { > + .id = CMD_FLUSH_QUEUE, > + .len = MSG_HEADER_LEN + > + sizeof(struct kvaser_msg_flush_queue), > + .u.flush_queue.channel = priv->channel, > + .u.flush_queue.flags = 0x00, > + }; > + > + return kvaser_usb_send_msg(priv->dev, &msg); > +} > + > +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 = kvaser_usb_flush_queue(priv); > + if (err) > + netdev_warn(netdev, "Cannot flush queue, error %d\n", err); > + > + if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel)) > + netdev_warn(netdev, "Cannot reset card, error %d\n", err); > + > + err = kvaser_usb_stop_chip(priv); > + if (err) > + netdev_warn(netdev, "Cannot stop device, error %d\n", err); > + > + 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 can_frame *cf = (struct can_frame *)skb->data; > + struct kvaser_usb_tx_urb_context *context = NULL; > + struct urb *urb; > + void *buf; > + struct kvaser_msg *msg; > + int i, err; > + int ret = NETDEV_TX_OK; > + > + if (can_dropped_invalid_skb(netdev, skb)) > + return NETDEV_TX_OK; > + > + urb = usb_alloc_urb(0, GFP_ATOMIC); > + if (!urb) { > + netdev_err(netdev, "No memory left for URBs\n"); > + stats->tx_dropped++; > + goto nourbmem; > + } > + > + buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC); > + if (!buf) { > + netdev_err(netdev, "No memory left for USB buffer\n"); > + stats->tx_dropped++; > + goto nobufmem; > + } > + > + msg = buf; > + msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can); > + msg->u.tx_can.flags = 0; > + msg->u.tx_can.channel = priv->channel; > + > + if (cf->can_id & CAN_EFF_FLAG) { > + msg->id = CMD_TX_EXT_MESSAGE; > + msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f; > + msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f; > + msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f; > + msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff; > + msg->u.tx_can.msg[4] = cf->can_id & 0x3f; > + } else { > + msg->id = CMD_TX_STD_MESSAGE; > + msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f; > + msg->u.tx_can.msg[1] = cf->can_id & 0x3f; > + } > + > + msg->u.tx_can.msg[5] = cf->can_dlc; > + memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc); > + > + if (cf->can_id & CAN_RTR_FLAG) > + msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME; > + > + for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) { > + if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { > + context = &priv->tx_contexts[i]; > + break; > + } > + } > + > + if (!context) { > + netdev_warn(netdev, "cannot find free context\n"); > + ret = NETDEV_TX_BUSY; > + goto releasebuf; > + } > + > + context->priv = priv; > + context->echo_index = i; > + context->dlc = cf->can_dlc; > + > + msg->u.tx_can.tid = context->echo_index; > + > + usb_fill_bulk_urb(urb, dev->udev, > + usb_sndbulkpipe(dev->udev, > + dev->bulk_out->bEndpointAddress), > + buf, msg->len, > + kvaser_usb_write_bulk_callback, context); > + usb_anchor_urb(urb, &priv->tx_submitted); > + > + can_put_echo_skb(skb, netdev, context->echo_index); > + > + atomic_inc(&priv->active_tx_urbs); > + > + if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS) > + netif_stop_queue(netdev); > + > + err = usb_submit_urb(urb, GFP_ATOMIC); > + if (unlikely(err)) { > + can_free_echo_skb(netdev, context->echo_index); > + > + skb = NULL; /* set to NULL to avoid double free in > + * dev_kfree_skb(skb) */ > + > + atomic_dec(&priv->active_tx_urbs); > + usb_unanchor_urb(urb); > + > + stats->tx_dropped++; > + > + if (err == -ENODEV) > + netif_device_detach(netdev); > + else > + netdev_warn(netdev, "Failed tx_urb %d\n", err); > + > + goto releasebuf; > + } > + > + usb_free_urb(urb); > + > + return NETDEV_TX_OK; > + > +releasebuf: > + kfree(buf); > +nobufmem: > + usb_free_urb(urb); > +nourbmem: > + dev_kfree_skb(skb); > + 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, > +}; > + > +static struct can_bittiming_const kvaser_usb_bittiming_const = { > + .name = "kvaser_usb", > + .tseg1_min = KVASER_USB_TSEG1_MIN, > + .tseg1_max = KVASER_USB_TSEG1_MAX, > + .tseg2_min = KVASER_USB_TSEG2_MIN, > + .tseg2_max = KVASER_USB_TSEG2_MAX, > + .sjw_max = KVASER_USB_SJW_MAX, > + .brp_min = KVASER_USB_BRP_MIN, > + .brp_max = KVASER_USB_BRP_MAX, > + .brp_inc = KVASER_USB_BRP_INC, > +}; > + > +static int kvaser_usb_set_bittiming(struct net_device *netdev) > +{ > + struct kvaser_usb_net_priv *priv = netdev_priv(netdev); > + struct can_bittiming *bt = &priv->can.bittiming; > + struct kvaser_usb *dev = priv->dev; > + struct kvaser_msg msg = { > + .id = CMD_SET_BUS_PARAMS, > + .len = MSG_HEADER_LEN + > + sizeof(struct kvaser_msg_busparams), > + .u.busparams.channel = priv->channel, > + .u.busparams.tid = 0xff, > + .u.busparams.bitrate = cpu_to_le32(bt->bitrate), > + .u.busparams.sjw = bt->sjw, > + .u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1, > + .u.busparams.tseg2 = bt->phase_seg2, > + }; > + > + if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) > + msg.u.busparams.no_samp = 3; > + else > + msg.u.busparams.no_samp = 1; > + > + return kvaser_usb_send_msg(dev, &msg); > +} > + > +static int kvaser_usb_set_mode(struct net_device *netdev, > + enum can_mode mode) > +{ > + struct kvaser_usb_net_priv *priv = netdev_priv(netdev); > + int err; > + > + switch (mode) { > + case CAN_MODE_START: > + err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP); > + if (err) > + return err; > + break; > + default: > + return -EOPNOTSUPP; > + } > + > + return 0; > +} > + > +static int kvaser_usb_get_berr_counter(const struct net_device *netdev, > + struct can_berr_counter *bec) > +{ > + struct kvaser_usb_net_priv *priv = netdev_priv(netdev); > + > + *bec = priv->bec; > + > + return 0; > +} > + > +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_netdev(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 usb_interface *intf, > + const struct usb_device_id *id, int channel) > +{ > + struct kvaser_usb *dev = usb_get_intfdata(intf); > + struct net_device *netdev; > + struct kvaser_usb_net_priv *priv; > + int i, err; > + > + netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); > + if (!netdev) { > + dev_err(&intf->dev, "Cannot alloc candev\n"); > + return -ENOMEM; > + } > + > + priv = netdev_priv(netdev); > + > + init_completion(&priv->start_comp); > + init_completion(&priv->stop_comp); > + > + init_usb_anchor(&priv->tx_submitted); > + atomic_set(&priv->active_tx_urbs, 0); > + > + for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) > + priv->tx_contexts[i].echo_index = MAX_TX_URBS; > + > + priv->dev = dev; > + priv->netdev = netdev; > + priv->channel = channel; > + > + priv->can.state = CAN_STATE_STOPPED; > + priv->can.clock.freq = CAN_USB_CLOCK; > + priv->can.bittiming_const = &kvaser_usb_bittiming_const; > + priv->can.do_set_bittiming = kvaser_usb_set_bittiming; > + priv->can.do_set_mode = kvaser_usb_set_mode; > + if (id->driver_info & KVASER_HAS_TXRX_ERRORS) > + priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter; > + priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES; > + if (id->driver_info & KVASER_HAS_SILENT_MODE) > + priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY; > + > + netdev->flags |= IFF_ECHO; > + > + netdev->netdev_ops = &kvaser_usb_netdev_ops; > + > + SET_NETDEV_DEV(netdev, &intf->dev); > + > + dev->nets[channel] = priv; > + > + err = register_candev(netdev); > + if (err) { > + dev_err(&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 void kvaser_usb_get_endpoints(const struct usb_interface *intf, > + struct usb_endpoint_descriptor **in, > + struct usb_endpoint_descriptor **out) > +{ > + const struct usb_host_interface *iface_desc; > + struct usb_endpoint_descriptor *endpoint; > + int i; > + > + iface_desc = &intf->altsetting[0]; > + > + for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { > + endpoint = &iface_desc->endpoint[i].desc; > + > + if (usb_endpoint_is_bulk_in(endpoint)) > + *in = endpoint; > + > + if (usb_endpoint_is_bulk_out(endpoint)) > + *out = endpoint; > + } > +} > + > +static int kvaser_usb_probe(struct usb_interface *intf, > + const struct usb_device_id *id) > +{ > + struct kvaser_usb *dev; > + int err = -ENOMEM; > + int i; > + > + dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL); > + if (!dev) > + return -ENOMEM; > + > + kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out); > + if (!dev->bulk_in || !dev->bulk_out) { > + 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); > + > + for (i = 0; i < MAX_NET_DEVICES; i++) > + kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i); > + > + err = kvaser_usb_get_software_info(dev); > + if (err) { > + dev_err(&intf->dev, > + "Cannot get software infos, error %d\n", err); > + return err; > + } > + > + err = kvaser_usb_get_card_info(dev); > + if (err) { > + dev_err(&intf->dev, > + "Cannot get card infos, error %d\n", err); > + return err; > + } > + > + dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n", > + ((dev->fw_version >> 24) & 0xff), > + ((dev->fw_version >> 16) & 0xff), > + (dev->fw_version & 0xffff)); > + > + for (i = 0; i < dev->nchannels; i++) { > + err = kvaser_usb_init_one(intf, 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@xxxxxxxxx>"); > +MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices"); > +MODULE_LICENSE("GPL v2"); > -- > 1.7.9.5 > -- Olivier -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
