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1157 lines
26 KiB
1157 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* CAN driver for esd CAN-USB/2 and CAN-USB/Micro |
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* |
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* Copyright (C) 2010-2012 Matthias Fuchs <[email protected]>, esd gmbh |
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*/ |
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#include <linux/signal.h> |
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#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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|
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MODULE_AUTHOR("Matthias Fuchs <[email protected]>"); |
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MODULE_DESCRIPTION("CAN driver for esd CAN-USB/2 and CAN-USB/Micro interfaces"); |
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MODULE_LICENSE("GPL v2"); |
|
|
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/* Define these values to match your devices */ |
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#define USB_ESDGMBH_VENDOR_ID 0x0ab4 |
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#define USB_CANUSB2_PRODUCT_ID 0x0010 |
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#define USB_CANUSBM_PRODUCT_ID 0x0011 |
|
|
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#define ESD_USB2_CAN_CLOCK 60000000 |
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#define ESD_USBM_CAN_CLOCK 36000000 |
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#define ESD_USB2_MAX_NETS 2 |
|
|
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/* USB2 commands */ |
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#define CMD_VERSION 1 /* also used for VERSION_REPLY */ |
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#define CMD_CAN_RX 2 /* device to host only */ |
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#define CMD_CAN_TX 3 /* also used for TX_DONE */ |
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#define CMD_SETBAUD 4 /* also used for SETBAUD_REPLY */ |
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#define CMD_TS 5 /* also used for TS_REPLY */ |
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#define CMD_IDADD 6 /* also used for IDADD_REPLY */ |
|
|
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/* esd CAN message flags - dlc field */ |
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#define ESD_RTR 0x10 |
|
|
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/* esd CAN message flags - id field */ |
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#define ESD_EXTID 0x20000000 |
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#define ESD_EVENT 0x40000000 |
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#define ESD_IDMASK 0x1fffffff |
|
|
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/* esd CAN event ids used by this driver */ |
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#define ESD_EV_CAN_ERROR_EXT 2 |
|
|
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/* baudrate message flags */ |
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#define ESD_USB2_UBR 0x80000000 |
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#define ESD_USB2_LOM 0x40000000 |
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#define ESD_USB2_NO_BAUDRATE 0x7fffffff |
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#define ESD_USB2_TSEG1_MIN 1 |
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#define ESD_USB2_TSEG1_MAX 16 |
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#define ESD_USB2_TSEG1_SHIFT 16 |
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#define ESD_USB2_TSEG2_MIN 1 |
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#define ESD_USB2_TSEG2_MAX 8 |
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#define ESD_USB2_TSEG2_SHIFT 20 |
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#define ESD_USB2_SJW_MAX 4 |
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#define ESD_USB2_SJW_SHIFT 14 |
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#define ESD_USBM_SJW_SHIFT 24 |
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#define ESD_USB2_BRP_MIN 1 |
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#define ESD_USB2_BRP_MAX 1024 |
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#define ESD_USB2_BRP_INC 1 |
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#define ESD_USB2_3_SAMPLES 0x00800000 |
|
|
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/* esd IDADD message */ |
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#define ESD_ID_ENABLE 0x80 |
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#define ESD_MAX_ID_SEGMENT 64 |
|
|
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/* SJA1000 ECC register (emulated by usb2 firmware) */ |
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#define SJA1000_ECC_SEG 0x1F |
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#define SJA1000_ECC_DIR 0x20 |
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#define SJA1000_ECC_ERR 0x06 |
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#define SJA1000_ECC_BIT 0x00 |
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#define SJA1000_ECC_FORM 0x40 |
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#define SJA1000_ECC_STUFF 0x80 |
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#define SJA1000_ECC_MASK 0xc0 |
|
|
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/* esd bus state event codes */ |
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#define ESD_BUSSTATE_MASK 0xc0 |
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#define ESD_BUSSTATE_WARN 0x40 |
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#define ESD_BUSSTATE_ERRPASSIVE 0x80 |
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#define ESD_BUSSTATE_BUSOFF 0xc0 |
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|
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#define RX_BUFFER_SIZE 1024 |
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#define MAX_RX_URBS 4 |
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#define MAX_TX_URBS 16 /* must be power of 2 */ |
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|
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struct header_msg { |
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u8 len; /* len is always the total message length in 32bit words */ |
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u8 cmd; |
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u8 rsvd[2]; |
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}; |
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|
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struct version_msg { |
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u8 len; |
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u8 cmd; |
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u8 rsvd; |
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u8 flags; |
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__le32 drv_version; |
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}; |
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|
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struct version_reply_msg { |
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u8 len; |
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u8 cmd; |
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u8 nets; |
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u8 features; |
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__le32 version; |
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u8 name[16]; |
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__le32 rsvd; |
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__le32 ts; |
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}; |
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|
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struct rx_msg { |
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u8 len; |
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u8 cmd; |
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u8 net; |
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u8 dlc; |
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__le32 ts; |
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__le32 id; /* upper 3 bits contain flags */ |
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u8 data[8]; |
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}; |
|
|
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struct tx_msg { |
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u8 len; |
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u8 cmd; |
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u8 net; |
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u8 dlc; |
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u32 hnd; /* opaque handle, not used by device */ |
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__le32 id; /* upper 3 bits contain flags */ |
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u8 data[8]; |
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}; |
|
|
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struct tx_done_msg { |
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u8 len; |
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u8 cmd; |
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u8 net; |
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u8 status; |
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u32 hnd; /* opaque handle, not used by device */ |
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__le32 ts; |
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}; |
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|
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struct id_filter_msg { |
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u8 len; |
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u8 cmd; |
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u8 net; |
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u8 option; |
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__le32 mask[ESD_MAX_ID_SEGMENT + 1]; |
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}; |
|
|
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struct set_baudrate_msg { |
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u8 len; |
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u8 cmd; |
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u8 net; |
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u8 rsvd; |
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__le32 baud; |
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}; |
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|
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/* Main message type used between library and application */ |
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struct __attribute__ ((packed)) esd_usb2_msg { |
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union { |
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struct header_msg hdr; |
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struct version_msg version; |
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struct version_reply_msg version_reply; |
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struct rx_msg rx; |
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struct tx_msg tx; |
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struct tx_done_msg txdone; |
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struct set_baudrate_msg setbaud; |
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struct id_filter_msg filter; |
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} msg; |
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}; |
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|
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static struct usb_device_id esd_usb2_table[] = { |
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{USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSB2_PRODUCT_ID)}, |
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{USB_DEVICE(USB_ESDGMBH_VENDOR_ID, USB_CANUSBM_PRODUCT_ID)}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(usb, esd_usb2_table); |
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|
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struct esd_usb2_net_priv; |
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|
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struct esd_tx_urb_context { |
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struct esd_usb2_net_priv *priv; |
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u32 echo_index; |
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int len; /* CAN payload length */ |
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}; |
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|
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struct esd_usb2 { |
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struct usb_device *udev; |
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struct esd_usb2_net_priv *nets[ESD_USB2_MAX_NETS]; |
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|
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struct usb_anchor rx_submitted; |
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|
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int net_count; |
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u32 version; |
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int rxinitdone; |
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void *rxbuf[MAX_RX_URBS]; |
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dma_addr_t rxbuf_dma[MAX_RX_URBS]; |
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}; |
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|
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struct esd_usb2_net_priv { |
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struct can_priv can; /* must be the first member */ |
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|
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atomic_t active_tx_jobs; |
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struct usb_anchor tx_submitted; |
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struct esd_tx_urb_context tx_contexts[MAX_TX_URBS]; |
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|
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struct esd_usb2 *usb2; |
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struct net_device *netdev; |
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int index; |
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u8 old_state; |
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struct can_berr_counter bec; |
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}; |
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|
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static void esd_usb2_rx_event(struct esd_usb2_net_priv *priv, |
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struct esd_usb2_msg *msg) |
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{ |
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struct net_device_stats *stats = &priv->netdev->stats; |
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struct can_frame *cf; |
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struct sk_buff *skb; |
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u32 id = le32_to_cpu(msg->msg.rx.id) & ESD_IDMASK; |
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|
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if (id == ESD_EV_CAN_ERROR_EXT) { |
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u8 state = msg->msg.rx.data[0]; |
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u8 ecc = msg->msg.rx.data[1]; |
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u8 rxerr = msg->msg.rx.data[2]; |
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u8 txerr = msg->msg.rx.data[3]; |
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|
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skb = alloc_can_err_skb(priv->netdev, &cf); |
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if (skb == NULL) { |
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stats->rx_dropped++; |
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return; |
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} |
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|
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if (state != priv->old_state) { |
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priv->old_state = state; |
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|
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switch (state & ESD_BUSSTATE_MASK) { |
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case ESD_BUSSTATE_BUSOFF: |
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priv->can.state = CAN_STATE_BUS_OFF; |
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cf->can_id |= CAN_ERR_BUSOFF; |
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priv->can.can_stats.bus_off++; |
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can_bus_off(priv->netdev); |
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break; |
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case ESD_BUSSTATE_WARN: |
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priv->can.state = CAN_STATE_ERROR_WARNING; |
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priv->can.can_stats.error_warning++; |
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break; |
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case ESD_BUSSTATE_ERRPASSIVE: |
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priv->can.state = CAN_STATE_ERROR_PASSIVE; |
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priv->can.can_stats.error_passive++; |
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break; |
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default: |
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priv->can.state = CAN_STATE_ERROR_ACTIVE; |
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break; |
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} |
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} else { |
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priv->can.can_stats.bus_error++; |
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stats->rx_errors++; |
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|
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cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR; |
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|
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switch (ecc & SJA1000_ECC_MASK) { |
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case SJA1000_ECC_BIT: |
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cf->data[2] |= CAN_ERR_PROT_BIT; |
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break; |
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case SJA1000_ECC_FORM: |
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cf->data[2] |= CAN_ERR_PROT_FORM; |
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break; |
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case SJA1000_ECC_STUFF: |
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cf->data[2] |= CAN_ERR_PROT_STUFF; |
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break; |
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default: |
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cf->data[3] = ecc & SJA1000_ECC_SEG; |
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break; |
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} |
|
|
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/* Error occurred during transmission? */ |
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if (!(ecc & SJA1000_ECC_DIR)) |
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cf->data[2] |= CAN_ERR_PROT_TX; |
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|
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if (priv->can.state == CAN_STATE_ERROR_WARNING || |
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priv->can.state == CAN_STATE_ERROR_PASSIVE) { |
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cf->data[1] = (txerr > rxerr) ? |
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CAN_ERR_CRTL_TX_PASSIVE : |
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CAN_ERR_CRTL_RX_PASSIVE; |
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} |
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cf->data[6] = txerr; |
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cf->data[7] = rxerr; |
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} |
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|
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priv->bec.txerr = txerr; |
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priv->bec.rxerr = rxerr; |
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|
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stats->rx_packets++; |
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stats->rx_bytes += cf->len; |
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netif_rx(skb); |
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} |
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} |
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|
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static void esd_usb2_rx_can_msg(struct esd_usb2_net_priv *priv, |
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struct esd_usb2_msg *msg) |
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{ |
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struct net_device_stats *stats = &priv->netdev->stats; |
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struct can_frame *cf; |
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struct sk_buff *skb; |
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int i; |
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u32 id; |
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|
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if (!netif_device_present(priv->netdev)) |
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return; |
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id = le32_to_cpu(msg->msg.rx.id); |
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|
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if (id & ESD_EVENT) { |
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esd_usb2_rx_event(priv, msg); |
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} else { |
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skb = alloc_can_skb(priv->netdev, &cf); |
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if (skb == NULL) { |
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stats->rx_dropped++; |
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return; |
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} |
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|
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cf->can_id = id & ESD_IDMASK; |
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can_frame_set_cc_len(cf, msg->msg.rx.dlc & ~ESD_RTR, |
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priv->can.ctrlmode); |
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|
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if (id & ESD_EXTID) |
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cf->can_id |= CAN_EFF_FLAG; |
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|
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if (msg->msg.rx.dlc & ESD_RTR) { |
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cf->can_id |= CAN_RTR_FLAG; |
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} else { |
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for (i = 0; i < cf->len; i++) |
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cf->data[i] = msg->msg.rx.data[i]; |
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} |
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|
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stats->rx_packets++; |
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stats->rx_bytes += cf->len; |
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netif_rx(skb); |
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} |
|
|
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return; |
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} |
|
|
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static void esd_usb2_tx_done_msg(struct esd_usb2_net_priv *priv, |
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struct esd_usb2_msg *msg) |
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{ |
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struct net_device_stats *stats = &priv->netdev->stats; |
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struct net_device *netdev = priv->netdev; |
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struct esd_tx_urb_context *context; |
|
|
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if (!netif_device_present(netdev)) |
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return; |
|
|
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context = &priv->tx_contexts[msg->msg.txdone.hnd & (MAX_TX_URBS - 1)]; |
|
|
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if (!msg->msg.txdone.status) { |
|
stats->tx_packets++; |
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stats->tx_bytes += context->len; |
|
can_get_echo_skb(netdev, context->echo_index, NULL); |
|
} else { |
|
stats->tx_errors++; |
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can_free_echo_skb(netdev, context->echo_index, NULL); |
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} |
|
|
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/* Release context */ |
|
context->echo_index = MAX_TX_URBS; |
|
atomic_dec(&priv->active_tx_jobs); |
|
|
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netif_wake_queue(netdev); |
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} |
|
|
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static void esd_usb2_read_bulk_callback(struct urb *urb) |
|
{ |
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struct esd_usb2 *dev = urb->context; |
|
int retval; |
|
int pos = 0; |
|
int i; |
|
|
|
switch (urb->status) { |
|
case 0: /* success */ |
|
break; |
|
|
|
case -ENOENT: |
|
case -EPIPE: |
|
case -EPROTO: |
|
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) { |
|
struct esd_usb2_msg *msg; |
|
|
|
msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos); |
|
|
|
switch (msg->msg.hdr.cmd) { |
|
case CMD_CAN_RX: |
|
if (msg->msg.rx.net >= dev->net_count) { |
|
dev_err(dev->udev->dev.parent, "format error\n"); |
|
break; |
|
} |
|
|
|
esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg); |
|
break; |
|
|
|
case CMD_CAN_TX: |
|
if (msg->msg.txdone.net >= dev->net_count) { |
|
dev_err(dev->udev->dev.parent, "format error\n"); |
|
break; |
|
} |
|
|
|
esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net], |
|
msg); |
|
break; |
|
} |
|
|
|
pos += msg->msg.hdr.len << 2; |
|
|
|
if (pos > urb->actual_length) { |
|
dev_err(dev->udev->dev.parent, "format error\n"); |
|
break; |
|
} |
|
} |
|
|
|
resubmit_urb: |
|
usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1), |
|
urb->transfer_buffer, RX_BUFFER_SIZE, |
|
esd_usb2_read_bulk_callback, dev); |
|
|
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retval = usb_submit_urb(urb, GFP_ATOMIC); |
|
if (retval == -ENODEV) { |
|
for (i = 0; i < dev->net_count; i++) { |
|
if (dev->nets[i]) |
|
netif_device_detach(dev->nets[i]->netdev); |
|
} |
|
} else if (retval) { |
|
dev_err(dev->udev->dev.parent, |
|
"failed resubmitting read bulk urb: %d\n", retval); |
|
} |
|
|
|
return; |
|
} |
|
|
|
/* |
|
* callback for bulk IN urb |
|
*/ |
|
static void esd_usb2_write_bulk_callback(struct urb *urb) |
|
{ |
|
struct esd_tx_urb_context *context = urb->context; |
|
struct esd_usb2_net_priv *priv; |
|
struct net_device *netdev; |
|
size_t size = sizeof(struct esd_usb2_msg); |
|
|
|
WARN_ON(!context); |
|
|
|
priv = context->priv; |
|
netdev = priv->netdev; |
|
|
|
/* free up our allocated buffer */ |
|
usb_free_coherent(urb->dev, size, |
|
urb->transfer_buffer, urb->transfer_dma); |
|
|
|
if (!netif_device_present(netdev)) |
|
return; |
|
|
|
if (urb->status) |
|
netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status); |
|
|
|
netif_trans_update(netdev); |
|
} |
|
|
|
static ssize_t firmware_show(struct device *d, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct usb_interface *intf = to_usb_interface(d); |
|
struct esd_usb2 *dev = usb_get_intfdata(intf); |
|
|
|
return sprintf(buf, "%d.%d.%d\n", |
|
(dev->version >> 12) & 0xf, |
|
(dev->version >> 8) & 0xf, |
|
dev->version & 0xff); |
|
} |
|
static DEVICE_ATTR_RO(firmware); |
|
|
|
static ssize_t hardware_show(struct device *d, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct usb_interface *intf = to_usb_interface(d); |
|
struct esd_usb2 *dev = usb_get_intfdata(intf); |
|
|
|
return sprintf(buf, "%d.%d.%d\n", |
|
(dev->version >> 28) & 0xf, |
|
(dev->version >> 24) & 0xf, |
|
(dev->version >> 16) & 0xff); |
|
} |
|
static DEVICE_ATTR_RO(hardware); |
|
|
|
static ssize_t nets_show(struct device *d, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct usb_interface *intf = to_usb_interface(d); |
|
struct esd_usb2 *dev = usb_get_intfdata(intf); |
|
|
|
return sprintf(buf, "%d", dev->net_count); |
|
} |
|
static DEVICE_ATTR_RO(nets); |
|
|
|
static int esd_usb2_send_msg(struct esd_usb2 *dev, struct esd_usb2_msg *msg) |
|
{ |
|
int actual_length; |
|
|
|
return usb_bulk_msg(dev->udev, |
|
usb_sndbulkpipe(dev->udev, 2), |
|
msg, |
|
msg->msg.hdr.len << 2, |
|
&actual_length, |
|
1000); |
|
} |
|
|
|
static int esd_usb2_wait_msg(struct esd_usb2 *dev, |
|
struct esd_usb2_msg *msg) |
|
{ |
|
int actual_length; |
|
|
|
return usb_bulk_msg(dev->udev, |
|
usb_rcvbulkpipe(dev->udev, 1), |
|
msg, |
|
sizeof(*msg), |
|
&actual_length, |
|
1000); |
|
} |
|
|
|
static int esd_usb2_setup_rx_urbs(struct esd_usb2 *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; |
|
|
|
/* create a URB, and a buffer for it */ |
|
urb = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!urb) { |
|
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"); |
|
err = -ENOMEM; |
|
goto freeurb; |
|
} |
|
|
|
urb->transfer_dma = buf_dma; |
|
|
|
usb_fill_bulk_urb(urb, dev->udev, |
|
usb_rcvbulkpipe(dev->udev, 1), |
|
buf, RX_BUFFER_SIZE, |
|
esd_usb2_read_bulk_callback, dev); |
|
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; |
|
usb_anchor_urb(urb, &dev->rx_submitted); |
|
|
|
err = usb_submit_urb(urb, GFP_KERNEL); |
|
if (err) { |
|
usb_unanchor_urb(urb); |
|
usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf, |
|
urb->transfer_dma); |
|
goto freeurb; |
|
} |
|
|
|
dev->rxbuf[i] = buf; |
|
dev->rxbuf_dma[i] = buf_dma; |
|
|
|
freeurb: |
|
/* Drop reference, USB core will take care of freeing it */ |
|
usb_free_urb(urb); |
|
if (err) |
|
break; |
|
} |
|
|
|
/* Did we submit any URBs */ |
|
if (i == 0) { |
|
dev_err(dev->udev->dev.parent, "couldn't setup read URBs\n"); |
|
return err; |
|
} |
|
|
|
/* Warn if we've couldn't transmit all the URBs */ |
|
if (i < MAX_RX_URBS) { |
|
dev_warn(dev->udev->dev.parent, |
|
"rx performance may be slow\n"); |
|
} |
|
|
|
dev->rxinitdone = 1; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Start interface |
|
*/ |
|
static int esd_usb2_start(struct esd_usb2_net_priv *priv) |
|
{ |
|
struct esd_usb2 *dev = priv->usb2; |
|
struct net_device *netdev = priv->netdev; |
|
struct esd_usb2_msg *msg; |
|
int err, i; |
|
|
|
msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
|
if (!msg) { |
|
err = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
/* |
|
* Enable all IDs |
|
* The IDADD message takes up to 64 32 bit bitmasks (2048 bits). |
|
* Each bit represents one 11 bit CAN identifier. A set bit |
|
* enables reception of the corresponding CAN identifier. A cleared |
|
* bit disabled this identifier. An additional bitmask value |
|
* following the CAN 2.0A bits is used to enable reception of |
|
* extended CAN frames. Only the LSB of this final mask is checked |
|
* for the complete 29 bit ID range. The IDADD message also allows |
|
* filter configuration for an ID subset. In this case you can add |
|
* the number of the starting bitmask (0..64) to the filter.option |
|
* field followed by only some bitmasks. |
|
*/ |
|
msg->msg.hdr.cmd = CMD_IDADD; |
|
msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; |
|
msg->msg.filter.net = priv->index; |
|
msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ |
|
for (i = 0; i < ESD_MAX_ID_SEGMENT; i++) |
|
msg->msg.filter.mask[i] = cpu_to_le32(0xffffffff); |
|
/* enable 29bit extended IDs */ |
|
msg->msg.filter.mask[ESD_MAX_ID_SEGMENT] = cpu_to_le32(0x00000001); |
|
|
|
err = esd_usb2_send_msg(dev, msg); |
|
if (err) |
|
goto out; |
|
|
|
err = esd_usb2_setup_rx_urbs(dev); |
|
if (err) |
|
goto out; |
|
|
|
priv->can.state = CAN_STATE_ERROR_ACTIVE; |
|
|
|
out: |
|
if (err == -ENODEV) |
|
netif_device_detach(netdev); |
|
if (err) |
|
netdev_err(netdev, "couldn't start device: %d\n", err); |
|
|
|
kfree(msg); |
|
return err; |
|
} |
|
|
|
static void unlink_all_urbs(struct esd_usb2 *dev) |
|
{ |
|
struct esd_usb2_net_priv *priv; |
|
int i, j; |
|
|
|
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 < dev->net_count; i++) { |
|
priv = dev->nets[i]; |
|
if (priv) { |
|
usb_kill_anchored_urbs(&priv->tx_submitted); |
|
atomic_set(&priv->active_tx_jobs, 0); |
|
|
|
for (j = 0; j < MAX_TX_URBS; j++) |
|
priv->tx_contexts[j].echo_index = MAX_TX_URBS; |
|
} |
|
} |
|
} |
|
|
|
static int esd_usb2_open(struct net_device *netdev) |
|
{ |
|
struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
|
int err; |
|
|
|
/* common open */ |
|
err = open_candev(netdev); |
|
if (err) |
|
return err; |
|
|
|
/* finally start device */ |
|
err = esd_usb2_start(priv); |
|
if (err) { |
|
netdev_warn(netdev, "couldn't start device: %d\n", err); |
|
close_candev(netdev); |
|
return err; |
|
} |
|
|
|
netif_start_queue(netdev); |
|
|
|
return 0; |
|
} |
|
|
|
static netdev_tx_t esd_usb2_start_xmit(struct sk_buff *skb, |
|
struct net_device *netdev) |
|
{ |
|
struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
|
struct esd_usb2 *dev = priv->usb2; |
|
struct esd_tx_urb_context *context = NULL; |
|
struct net_device_stats *stats = &netdev->stats; |
|
struct can_frame *cf = (struct can_frame *)skb->data; |
|
struct esd_usb2_msg *msg; |
|
struct urb *urb; |
|
u8 *buf; |
|
int i, err; |
|
int ret = NETDEV_TX_OK; |
|
size_t size = sizeof(struct esd_usb2_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) { |
|
stats->tx_dropped++; |
|
dev_kfree_skb(skb); |
|
goto nourbmem; |
|
} |
|
|
|
buf = usb_alloc_coherent(dev->udev, size, GFP_ATOMIC, |
|
&urb->transfer_dma); |
|
if (!buf) { |
|
netdev_err(netdev, "No memory left for USB buffer\n"); |
|
stats->tx_dropped++; |
|
dev_kfree_skb(skb); |
|
goto nobufmem; |
|
} |
|
|
|
msg = (struct esd_usb2_msg *)buf; |
|
|
|
msg->msg.hdr.len = 3; /* minimal length */ |
|
msg->msg.hdr.cmd = CMD_CAN_TX; |
|
msg->msg.tx.net = priv->index; |
|
msg->msg.tx.dlc = can_get_cc_dlc(cf, priv->can.ctrlmode); |
|
msg->msg.tx.id = cpu_to_le32(cf->can_id & CAN_ERR_MASK); |
|
|
|
if (cf->can_id & CAN_RTR_FLAG) |
|
msg->msg.tx.dlc |= ESD_RTR; |
|
|
|
if (cf->can_id & CAN_EFF_FLAG) |
|
msg->msg.tx.id |= cpu_to_le32(ESD_EXTID); |
|
|
|
for (i = 0; i < cf->len; i++) |
|
msg->msg.tx.data[i] = cf->data[i]; |
|
|
|
msg->msg.hdr.len += (cf->len + 3) >> 2; |
|
|
|
for (i = 0; i < MAX_TX_URBS; i++) { |
|
if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) { |
|
context = &priv->tx_contexts[i]; |
|
break; |
|
} |
|
} |
|
|
|
/* |
|
* This may never happen. |
|
*/ |
|
if (!context) { |
|
netdev_warn(netdev, "couldn't find free context\n"); |
|
ret = NETDEV_TX_BUSY; |
|
goto releasebuf; |
|
} |
|
|
|
context->priv = priv; |
|
context->echo_index = i; |
|
context->len = cf->len; |
|
|
|
/* hnd must not be 0 - MSB is stripped in txdone handling */ |
|
msg->msg.tx.hnd = 0x80000000 | i; /* returned in TX done message */ |
|
|
|
usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 2), buf, |
|
msg->msg.hdr.len << 2, |
|
esd_usb2_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_jobs); |
|
|
|
/* Slow down tx path */ |
|
if (atomic_read(&priv->active_tx_jobs) >= MAX_TX_URBS) |
|
netif_stop_queue(netdev); |
|
|
|
err = usb_submit_urb(urb, GFP_ATOMIC); |
|
if (err) { |
|
can_free_echo_skb(netdev, context->echo_index, NULL); |
|
|
|
atomic_dec(&priv->active_tx_jobs); |
|
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; |
|
} |
|
|
|
netif_trans_update(netdev); |
|
|
|
/* |
|
* Release our reference to this URB, the USB core will eventually free |
|
* it entirely. |
|
*/ |
|
usb_free_urb(urb); |
|
|
|
return NETDEV_TX_OK; |
|
|
|
releasebuf: |
|
usb_free_coherent(dev->udev, size, buf, urb->transfer_dma); |
|
|
|
nobufmem: |
|
usb_free_urb(urb); |
|
|
|
nourbmem: |
|
return ret; |
|
} |
|
|
|
static int esd_usb2_close(struct net_device *netdev) |
|
{ |
|
struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
|
struct esd_usb2_msg *msg; |
|
int i; |
|
|
|
msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
|
if (!msg) |
|
return -ENOMEM; |
|
|
|
/* Disable all IDs (see esd_usb2_start()) */ |
|
msg->msg.hdr.cmd = CMD_IDADD; |
|
msg->msg.hdr.len = 2 + ESD_MAX_ID_SEGMENT; |
|
msg->msg.filter.net = priv->index; |
|
msg->msg.filter.option = ESD_ID_ENABLE; /* start with segment 0 */ |
|
for (i = 0; i <= ESD_MAX_ID_SEGMENT; i++) |
|
msg->msg.filter.mask[i] = 0; |
|
if (esd_usb2_send_msg(priv->usb2, msg) < 0) |
|
netdev_err(netdev, "sending idadd message failed\n"); |
|
|
|
/* set CAN controller to reset mode */ |
|
msg->msg.hdr.len = 2; |
|
msg->msg.hdr.cmd = CMD_SETBAUD; |
|
msg->msg.setbaud.net = priv->index; |
|
msg->msg.setbaud.rsvd = 0; |
|
msg->msg.setbaud.baud = cpu_to_le32(ESD_USB2_NO_BAUDRATE); |
|
if (esd_usb2_send_msg(priv->usb2, msg) < 0) |
|
netdev_err(netdev, "sending setbaud message failed\n"); |
|
|
|
priv->can.state = CAN_STATE_STOPPED; |
|
|
|
netif_stop_queue(netdev); |
|
|
|
close_candev(netdev); |
|
|
|
kfree(msg); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct net_device_ops esd_usb2_netdev_ops = { |
|
.ndo_open = esd_usb2_open, |
|
.ndo_stop = esd_usb2_close, |
|
.ndo_start_xmit = esd_usb2_start_xmit, |
|
.ndo_change_mtu = can_change_mtu, |
|
}; |
|
|
|
static const struct can_bittiming_const esd_usb2_bittiming_const = { |
|
.name = "esd_usb2", |
|
.tseg1_min = ESD_USB2_TSEG1_MIN, |
|
.tseg1_max = ESD_USB2_TSEG1_MAX, |
|
.tseg2_min = ESD_USB2_TSEG2_MIN, |
|
.tseg2_max = ESD_USB2_TSEG2_MAX, |
|
.sjw_max = ESD_USB2_SJW_MAX, |
|
.brp_min = ESD_USB2_BRP_MIN, |
|
.brp_max = ESD_USB2_BRP_MAX, |
|
.brp_inc = ESD_USB2_BRP_INC, |
|
}; |
|
|
|
static int esd_usb2_set_bittiming(struct net_device *netdev) |
|
{ |
|
struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
|
struct can_bittiming *bt = &priv->can.bittiming; |
|
struct esd_usb2_msg *msg; |
|
int err; |
|
u32 canbtr; |
|
int sjw_shift; |
|
|
|
canbtr = ESD_USB2_UBR; |
|
if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) |
|
canbtr |= ESD_USB2_LOM; |
|
|
|
canbtr |= (bt->brp - 1) & (ESD_USB2_BRP_MAX - 1); |
|
|
|
if (le16_to_cpu(priv->usb2->udev->descriptor.idProduct) == |
|
USB_CANUSBM_PRODUCT_ID) |
|
sjw_shift = ESD_USBM_SJW_SHIFT; |
|
else |
|
sjw_shift = ESD_USB2_SJW_SHIFT; |
|
|
|
canbtr |= ((bt->sjw - 1) & (ESD_USB2_SJW_MAX - 1)) |
|
<< sjw_shift; |
|
canbtr |= ((bt->prop_seg + bt->phase_seg1 - 1) |
|
& (ESD_USB2_TSEG1_MAX - 1)) |
|
<< ESD_USB2_TSEG1_SHIFT; |
|
canbtr |= ((bt->phase_seg2 - 1) & (ESD_USB2_TSEG2_MAX - 1)) |
|
<< ESD_USB2_TSEG2_SHIFT; |
|
if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) |
|
canbtr |= ESD_USB2_3_SAMPLES; |
|
|
|
msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
|
if (!msg) |
|
return -ENOMEM; |
|
|
|
msg->msg.hdr.len = 2; |
|
msg->msg.hdr.cmd = CMD_SETBAUD; |
|
msg->msg.setbaud.net = priv->index; |
|
msg->msg.setbaud.rsvd = 0; |
|
msg->msg.setbaud.baud = cpu_to_le32(canbtr); |
|
|
|
netdev_info(netdev, "setting BTR=%#x\n", canbtr); |
|
|
|
err = esd_usb2_send_msg(priv->usb2, msg); |
|
|
|
kfree(msg); |
|
return err; |
|
} |
|
|
|
static int esd_usb2_get_berr_counter(const struct net_device *netdev, |
|
struct can_berr_counter *bec) |
|
{ |
|
struct esd_usb2_net_priv *priv = netdev_priv(netdev); |
|
|
|
bec->txerr = priv->bec.txerr; |
|
bec->rxerr = priv->bec.rxerr; |
|
|
|
return 0; |
|
} |
|
|
|
static int esd_usb2_set_mode(struct net_device *netdev, enum can_mode mode) |
|
{ |
|
switch (mode) { |
|
case CAN_MODE_START: |
|
netif_wake_queue(netdev); |
|
break; |
|
|
|
default: |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int esd_usb2_probe_one_net(struct usb_interface *intf, int index) |
|
{ |
|
struct esd_usb2 *dev = usb_get_intfdata(intf); |
|
struct net_device *netdev; |
|
struct esd_usb2_net_priv *priv; |
|
int err = 0; |
|
int i; |
|
|
|
netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS); |
|
if (!netdev) { |
|
dev_err(&intf->dev, "couldn't alloc candev\n"); |
|
err = -ENOMEM; |
|
goto done; |
|
} |
|
|
|
priv = netdev_priv(netdev); |
|
|
|
init_usb_anchor(&priv->tx_submitted); |
|
atomic_set(&priv->active_tx_jobs, 0); |
|
|
|
for (i = 0; i < MAX_TX_URBS; i++) |
|
priv->tx_contexts[i].echo_index = MAX_TX_URBS; |
|
|
|
priv->usb2 = dev; |
|
priv->netdev = netdev; |
|
priv->index = index; |
|
|
|
priv->can.state = CAN_STATE_STOPPED; |
|
priv->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY | |
|
CAN_CTRLMODE_CC_LEN8_DLC; |
|
|
|
if (le16_to_cpu(dev->udev->descriptor.idProduct) == |
|
USB_CANUSBM_PRODUCT_ID) |
|
priv->can.clock.freq = ESD_USBM_CAN_CLOCK; |
|
else { |
|
priv->can.clock.freq = ESD_USB2_CAN_CLOCK; |
|
priv->can.ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES; |
|
} |
|
|
|
priv->can.bittiming_const = &esd_usb2_bittiming_const; |
|
priv->can.do_set_bittiming = esd_usb2_set_bittiming; |
|
priv->can.do_set_mode = esd_usb2_set_mode; |
|
priv->can.do_get_berr_counter = esd_usb2_get_berr_counter; |
|
|
|
netdev->flags |= IFF_ECHO; /* we support local echo */ |
|
|
|
netdev->netdev_ops = &esd_usb2_netdev_ops; |
|
|
|
SET_NETDEV_DEV(netdev, &intf->dev); |
|
netdev->dev_id = index; |
|
|
|
err = register_candev(netdev); |
|
if (err) { |
|
dev_err(&intf->dev, "couldn't register CAN device: %d\n", err); |
|
free_candev(netdev); |
|
err = -ENOMEM; |
|
goto done; |
|
} |
|
|
|
dev->nets[index] = priv; |
|
netdev_info(netdev, "device %s registered\n", netdev->name); |
|
|
|
done: |
|
return err; |
|
} |
|
|
|
/* |
|
* probe function for new USB2 devices |
|
* |
|
* check version information and number of available |
|
* CAN interfaces |
|
*/ |
|
static int esd_usb2_probe(struct usb_interface *intf, |
|
const struct usb_device_id *id) |
|
{ |
|
struct esd_usb2 *dev; |
|
struct esd_usb2_msg *msg; |
|
int i, err; |
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
|
if (!dev) { |
|
err = -ENOMEM; |
|
goto done; |
|
} |
|
|
|
dev->udev = interface_to_usbdev(intf); |
|
|
|
init_usb_anchor(&dev->rx_submitted); |
|
|
|
usb_set_intfdata(intf, dev); |
|
|
|
msg = kmalloc(sizeof(*msg), GFP_KERNEL); |
|
if (!msg) { |
|
err = -ENOMEM; |
|
goto free_msg; |
|
} |
|
|
|
/* query number of CAN interfaces (nets) */ |
|
msg->msg.hdr.cmd = CMD_VERSION; |
|
msg->msg.hdr.len = 2; |
|
msg->msg.version.rsvd = 0; |
|
msg->msg.version.flags = 0; |
|
msg->msg.version.drv_version = 0; |
|
|
|
err = esd_usb2_send_msg(dev, msg); |
|
if (err < 0) { |
|
dev_err(&intf->dev, "sending version message failed\n"); |
|
goto free_msg; |
|
} |
|
|
|
err = esd_usb2_wait_msg(dev, msg); |
|
if (err < 0) { |
|
dev_err(&intf->dev, "no version message answer\n"); |
|
goto free_msg; |
|
} |
|
|
|
dev->net_count = (int)msg->msg.version_reply.nets; |
|
dev->version = le32_to_cpu(msg->msg.version_reply.version); |
|
|
|
if (device_create_file(&intf->dev, &dev_attr_firmware)) |
|
dev_err(&intf->dev, |
|
"Couldn't create device file for firmware\n"); |
|
|
|
if (device_create_file(&intf->dev, &dev_attr_hardware)) |
|
dev_err(&intf->dev, |
|
"Couldn't create device file for hardware\n"); |
|
|
|
if (device_create_file(&intf->dev, &dev_attr_nets)) |
|
dev_err(&intf->dev, |
|
"Couldn't create device file for nets\n"); |
|
|
|
/* do per device probing */ |
|
for (i = 0; i < dev->net_count; i++) |
|
esd_usb2_probe_one_net(intf, i); |
|
|
|
free_msg: |
|
kfree(msg); |
|
if (err) |
|
kfree(dev); |
|
done: |
|
return err; |
|
} |
|
|
|
/* |
|
* called by the usb core when the device is removed from the system |
|
*/ |
|
static void esd_usb2_disconnect(struct usb_interface *intf) |
|
{ |
|
struct esd_usb2 *dev = usb_get_intfdata(intf); |
|
struct net_device *netdev; |
|
int i; |
|
|
|
device_remove_file(&intf->dev, &dev_attr_firmware); |
|
device_remove_file(&intf->dev, &dev_attr_hardware); |
|
device_remove_file(&intf->dev, &dev_attr_nets); |
|
|
|
usb_set_intfdata(intf, NULL); |
|
|
|
if (dev) { |
|
for (i = 0; i < dev->net_count; i++) { |
|
if (dev->nets[i]) { |
|
netdev = dev->nets[i]->netdev; |
|
unregister_netdev(netdev); |
|
free_candev(netdev); |
|
} |
|
} |
|
unlink_all_urbs(dev); |
|
kfree(dev); |
|
} |
|
} |
|
|
|
/* usb specific object needed to register this driver with the usb subsystem */ |
|
static struct usb_driver esd_usb2_driver = { |
|
.name = "esd_usb2", |
|
.probe = esd_usb2_probe, |
|
.disconnect = esd_usb2_disconnect, |
|
.id_table = esd_usb2_table, |
|
}; |
|
|
|
module_usb_driver(esd_usb2_driver);
|
|
|