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1028 lines
24 KiB
1028 lines
24 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* CAN driver for "8 devices" USB2CAN converter |
|
* |
|
* Copyright (C) 2012 Bernd Krumboeck ([email protected]) |
|
* |
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* This driver is inspired by the 3.2.0 version of drivers/net/can/usb/ems_usb.c |
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* and drivers/net/can/usb/esd_usb2.c |
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* |
|
* Many thanks to Gerhard Bertelsmann ([email protected]) |
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* for testing and fixing this driver. Also many thanks to "8 devices", |
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* who were very cooperative and answered my questions. |
|
*/ |
|
|
|
#include <linux/signal.h> |
|
#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/netdevice.h> |
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#include <linux/usb.h> |
|
|
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#include <linux/can.h> |
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#include <linux/can/dev.h> |
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#include <linux/can/error.h> |
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#include <linux/can/led.h> |
|
|
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/* driver constants */ |
|
#define MAX_RX_URBS 20 |
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#define MAX_TX_URBS 20 |
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#define RX_BUFFER_SIZE 64 |
|
|
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/* vendor and product id */ |
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#define USB_8DEV_VENDOR_ID 0x0483 |
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#define USB_8DEV_PRODUCT_ID 0x1234 |
|
|
|
/* endpoints */ |
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enum usb_8dev_endpoint { |
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USB_8DEV_ENDP_DATA_RX = 1, |
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USB_8DEV_ENDP_DATA_TX, |
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USB_8DEV_ENDP_CMD_RX, |
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USB_8DEV_ENDP_CMD_TX |
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}; |
|
|
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/* device CAN clock */ |
|
#define USB_8DEV_ABP_CLOCK 32000000 |
|
|
|
/* setup flags */ |
|
#define USB_8DEV_SILENT 0x01 |
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#define USB_8DEV_LOOPBACK 0x02 |
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#define USB_8DEV_DISABLE_AUTO_RESTRANS 0x04 |
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#define USB_8DEV_STATUS_FRAME 0x08 |
|
|
|
/* commands */ |
|
enum usb_8dev_cmd { |
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USB_8DEV_RESET = 1, |
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USB_8DEV_OPEN, |
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USB_8DEV_CLOSE, |
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USB_8DEV_SET_SPEED, |
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USB_8DEV_SET_MASK_FILTER, |
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USB_8DEV_GET_STATUS, |
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USB_8DEV_GET_STATISTICS, |
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USB_8DEV_GET_SERIAL, |
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USB_8DEV_GET_SOFTW_VER, |
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USB_8DEV_GET_HARDW_VER, |
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USB_8DEV_RESET_TIMESTAMP, |
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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 |
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#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 |
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#define USB_8DEV_TYPE_ERROR_FRAME 3 |
|
|
|
#define USB_8DEV_EXTID 0x01 |
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#define USB_8DEV_RTR 0x02 |
|
#define USB_8DEV_ERR_FLAG 0x04 |
|
|
|
/* status */ |
|
#define USB_8DEV_STATUSMSG_OK 0x00 /* Normal condition. */ |
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#define USB_8DEV_STATUSMSG_OVERRUN 0x01 /* Overrun occurred 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 */ |
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#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 */ |
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#define USB_8DEV_STATUSMSG_CRC 0x27 /* CRC Error */ |
|
|
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#define USB_8DEV_RP_MASK 0x7F /* Mask for Receive Error Bit */ |
|
|
|
|
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/* 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); |
|
|
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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 */ |
|
|
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struct sk_buff *echo_skb[MAX_TX_URBS]; |
|
|
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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]; |
|
|
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struct usb_anchor rx_submitted; |
|
|
|
struct can_berr_counter bec; |
|
|
|
u8 *cmd_msg_buffer; |
|
|
|
struct mutex usb_8dev_cmd_lock; |
|
void *rxbuf[MAX_RX_URBS]; |
|
dma_addr_t rxbuf_dma[MAX_RX_URBS]; |
|
}; |
|
|
|
/* 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 */ |
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u8 data[8]; /* 64-bit data */ |
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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 */ |
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u8 data[8]; /* 64-bit data */ |
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__be32 timestamp; /* 32-bit timestamp */ |
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u8 end; |
|
}; |
|
|
|
/* command frame */ |
|
struct __packed usb_8dev_cmd_msg { |
|
u8 begin; |
|
u8 channel; /* unknown - always 0 */ |
|
u8 command; /* command to execute */ |
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u8 opt1; /* optional parameter / return value */ |
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u8 opt2; /* optional parameter 2 */ |
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u8 data[10]; /* optional parameter and data */ |
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u8 end; |
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}; |
|
|
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static int usb_8dev_send_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size) |
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{ |
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int actual_length; |
|
|
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return usb_bulk_msg(priv->udev, |
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usb_sndbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_TX), |
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msg, size, &actual_length, USB_8DEV_CMD_TIMEOUT); |
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} |
|
|
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static int usb_8dev_wait_cmd_msg(struct usb_8dev_priv *priv, u8 *msg, int size, |
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int *actual_length) |
|
{ |
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return usb_bulk_msg(priv->udev, |
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usb_rcvbulkpipe(priv->udev, USB_8DEV_ENDP_CMD_RX), |
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msg, size, actual_length, USB_8DEV_CMD_TIMEOUT); |
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} |
|
|
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/* Send command to device and receive result. |
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* Command was successful when opt1 = 0. |
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*/ |
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static int usb_8dev_send_cmd(struct usb_8dev_priv *priv, |
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struct usb_8dev_cmd_msg *out, |
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struct usb_8dev_cmd_msg *in) |
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{ |
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int err; |
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int num_bytes_read; |
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struct net_device *netdev; |
|
|
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netdev = priv->netdev; |
|
|
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out->begin = USB_8DEV_CMD_START; |
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out->end = USB_8DEV_CMD_END; |
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|
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mutex_lock(&priv->usb_8dev_cmd_lock); |
|
|
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memcpy(priv->cmd_msg_buffer, out, |
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sizeof(struct usb_8dev_cmd_msg)); |
|
|
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err = usb_8dev_send_cmd_msg(priv, priv->cmd_msg_buffer, |
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sizeof(struct usb_8dev_cmd_msg)); |
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if (err < 0) { |
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netdev_err(netdev, "sending command message failed\n"); |
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goto failed; |
|
} |
|
|
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err = usb_8dev_wait_cmd_msg(priv, priv->cmd_msg_buffer, |
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sizeof(struct usb_8dev_cmd_msg), |
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&num_bytes_read); |
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if (err < 0) { |
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netdev_err(netdev, "no command message answer\n"); |
|
goto failed; |
|
} |
|
|
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memcpy(in, priv->cmd_msg_buffer, sizeof(struct usb_8dev_cmd_msg)); |
|
|
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if (in->begin != USB_8DEV_CMD_START || in->end != USB_8DEV_CMD_END || |
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num_bytes_read != 16 || in->opt1 != 0) |
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err = -EPROTO; |
|
|
|
failed: |
|
mutex_unlock(&priv->usb_8dev_cmd_lock); |
|
return err; |
|
} |
|
|
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/* Send open command to device */ |
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static int usb_8dev_cmd_open(struct usb_8dev_priv *priv) |
|
{ |
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struct can_bittiming *bt = &priv->can.bittiming; |
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struct usb_8dev_cmd_msg outmsg; |
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struct usb_8dev_cmd_msg inmsg; |
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u32 ctrlmode = priv->can.ctrlmode; |
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u32 flags = USB_8DEV_STATUS_FRAME; |
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__be32 beflags; |
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__be16 bebrp; |
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|
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memset(&outmsg, 0, sizeof(outmsg)); |
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outmsg.command = USB_8DEV_OPEN; |
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outmsg.opt1 = USB_8DEV_BAUD_MANUAL; |
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outmsg.data[0] = bt->prop_seg + bt->phase_seg1; |
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outmsg.data[1] = bt->phase_seg2; |
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outmsg.data[2] = bt->sjw; |
|
|
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/* BRP */ |
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bebrp = cpu_to_be16((u16)bt->brp); |
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memcpy(&outmsg.data[3], &bebrp, sizeof(bebrp)); |
|
|
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/* flags */ |
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if (ctrlmode & CAN_CTRLMODE_LOOPBACK) |
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flags |= USB_8DEV_LOOPBACK; |
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if (ctrlmode & CAN_CTRLMODE_LISTENONLY) |
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flags |= USB_8DEV_SILENT; |
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if (ctrlmode & CAN_CTRLMODE_ONE_SHOT) |
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flags |= USB_8DEV_DISABLE_AUTO_RESTRANS; |
|
|
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beflags = cpu_to_be32(flags); |
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memcpy(&outmsg.data[5], &beflags, sizeof(beflags)); |
|
|
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return usb_8dev_send_cmd(priv, &outmsg, &inmsg); |
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} |
|
|
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/* Send close command to device */ |
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static int usb_8dev_cmd_close(struct usb_8dev_priv *priv) |
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{ |
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struct usb_8dev_cmd_msg inmsg; |
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struct usb_8dev_cmd_msg outmsg = { |
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.channel = 0, |
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.command = USB_8DEV_CLOSE, |
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.opt1 = 0, |
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.opt2 = 0 |
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}; |
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|
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return usb_8dev_send_cmd(priv, &outmsg, &inmsg); |
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} |
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|
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/* Get firmware and hardware version */ |
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static int usb_8dev_cmd_version(struct usb_8dev_priv *priv, u32 *res) |
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{ |
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struct usb_8dev_cmd_msg inmsg; |
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struct usb_8dev_cmd_msg outmsg = { |
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.channel = 0, |
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.command = USB_8DEV_GET_SOFTW_HARDW_VER, |
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.opt1 = 0, |
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.opt2 = 0 |
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}; |
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|
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int err = usb_8dev_send_cmd(priv, &outmsg, &inmsg); |
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if (err) |
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return err; |
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|
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*res = be32_to_cpup((__be32 *)inmsg.data); |
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|
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return err; |
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} |
|
|
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/* Set network device mode |
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* |
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* Maybe we should leave this function empty, because the device |
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* set mode variable with open command. |
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*/ |
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static int usb_8dev_set_mode(struct net_device *netdev, enum can_mode mode) |
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{ |
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struct usb_8dev_priv *priv = netdev_priv(netdev); |
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int err = 0; |
|
|
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switch (mode) { |
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case CAN_MODE_START: |
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err = usb_8dev_cmd_open(priv); |
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if (err) |
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netdev_warn(netdev, "couldn't start device"); |
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break; |
|
|
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default: |
|
return -EOPNOTSUPP; |
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} |
|
|
|
return err; |
|
} |
|
|
|
/* Read error/status frames */ |
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static void usb_8dev_rx_err_msg(struct usb_8dev_priv *priv, |
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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; |
|
priv->can.can_stats.bus_off++; |
|
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[3] = CAN_ERR_PROT_LOC_CRC_SEQ; |
|
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; |
|
|
|
stats->rx_packets++; |
|
stats->rx_bytes += cf->len; |
|
netif_rx(skb); |
|
} |
|
|
|
/* 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); |
|
can_frame_set_cc_len(cf, msg->dlc & 0xF, priv->can.ctrlmode); |
|
|
|
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->len); |
|
|
|
stats->rx_packets++; |
|
stats->rx_bytes += cf->len; |
|
netif_rx(skb); |
|
|
|
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 -EPIPE: |
|
case -EPROTO: |
|
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, NULL); |
|
|
|
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) |
|
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 = can_get_cc_dlc(cf, priv->can.ctrlmode); |
|
memcpy(msg->data, cf->data, cf->len); |
|
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->len; |
|
|
|
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, 0); |
|
|
|
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_free_coherent(priv->udev, size, buf, urb->transfer_dma); |
|
usb_free_urb(urb); |
|
|
|
netdev_warn(netdev, "couldn't find free context"); |
|
|
|
return NETDEV_TX_BUSY; |
|
|
|
failed: |
|
can_free_echo_skb(netdev, context->echo_index, NULL); |
|
|
|
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; |
|
dma_addr_t buf_dma; |
|
|
|
/* create a URB, and a buffer for it */ |
|
urb = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!urb) { |
|
err = -ENOMEM; |
|
break; |
|
} |
|
|
|
buf = usb_alloc_coherent(priv->udev, RX_BUFFER_SIZE, GFP_KERNEL, |
|
&buf_dma); |
|
if (!buf) { |
|
netdev_err(netdev, "No memory left for USB buffer\n"); |
|
usb_free_urb(urb); |
|
err = -ENOMEM; |
|
break; |
|
} |
|
|
|
urb->transfer_dma = buf_dma; |
|
|
|
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); |
|
usb_free_urb(urb); |
|
break; |
|
} |
|
|
|
priv->rxbuf[i] = buf; |
|
priv->rxbuf_dma[i] = buf_dma; |
|
|
|
/* 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); |
|
|
|
for (i = 0; i < MAX_RX_URBS; ++i) |
|
usb_free_coherent(priv->udev, RX_BUFFER_SIZE, |
|
priv->rxbuf[i], priv->rxbuf_dma[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; |
|
} |
|
|
|
/* 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, |
|
.ndo_change_mtu = can_change_mtu, |
|
}; |
|
|
|
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 | |
|
CAN_CTRLMODE_CC_LEN8_DLC; |
|
|
|
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 = devm_kzalloc(&intf->dev, 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_candev; |
|
} |
|
|
|
err = usb_8dev_cmd_version(priv, &version); |
|
if (err) { |
|
netdev_err(netdev, "can't get firmware version\n"); |
|
goto cleanup_unregister_candev; |
|
} 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_unregister_candev: |
|
unregister_netdev(priv->netdev); |
|
|
|
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); |
|
unlink_all_urbs(priv); |
|
free_candev(priv->netdev); |
|
} |
|
|
|
} |
|
|
|
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 <[email protected]>"); |
|
MODULE_DESCRIPTION("CAN driver for 8 devices USB2CAN interfaces"); |
|
MODULE_LICENSE("GPL v2");
|
|
|