![Christopher R. Baker](/assets/img/avatar_default.png)
My objective is to be able to totally discriminate CAN ports on multi-port cards via udev so as to rename them to semantically interesting/unique names for my system (e.g., "ecuCAN" and "auxCAN" instead of "can0" and "can1"). The following patch assigns the dev_id field to match the channel number on all multi-channel devices. I can only test my two-port Peak PCI card, but it works as expected: ATTRS{dev_id} now expresses the port number and my udev rules now unambiguously pick out and rename my individual CAN ports. Signed-off-by: Christopher R. Baker <cbaker@rec.ri.cmu.edu> Tested-by: Oliver Hartkopp <socketcan@hartkopp.net> [PEAK PCAN-USB pro and EMS PCMCIA] Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
1158 lines
27 KiB
C
1158 lines
27 KiB
C
/*
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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 <matthias.fuchs@esd.eu>, esd gmbh
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published
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* by the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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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MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd.eu>");
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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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#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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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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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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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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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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__le32 hnd;
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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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__le32 hnd;
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__le32 ts;
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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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/* 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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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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struct esd_usb2_net_priv;
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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 dlc;
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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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struct usb_anchor rx_submitted;
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int net_count;
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u32 version;
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int rxinitdone;
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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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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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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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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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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 txerr = msg->msg.rx.data[2];
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u8 rxerr = msg->msg.rx.data[3];
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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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if (state != priv->old_state) {
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priv->old_state = state;
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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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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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cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
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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[2] |= CAN_ERR_PROT_UNSPEC;
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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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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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netif_rx(skb);
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priv->bec.txerr = txerr;
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priv->bec.rxerr = rxerr;
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stats->rx_packets++;
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stats->rx_bytes += cf->can_dlc;
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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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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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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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cf->can_id = id & ESD_IDMASK;
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cf->can_dlc = get_can_dlc(msg->msg.rx.dlc);
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if (id & ESD_EXTID)
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cf->can_id |= CAN_EFF_FLAG;
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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->can_dlc; i++)
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cf->data[i] = msg->msg.rx.data[i];
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}
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netif_rx(skb);
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stats->rx_packets++;
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stats->rx_bytes += cf->can_dlc;
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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) {
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stats->tx_packets++;
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stats->tx_bytes += context->dlc;
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can_get_echo_skb(netdev, context->echo_index);
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} else {
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stats->tx_errors++;
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can_free_echo_skb(netdev, context->echo_index);
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}
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/* Release context */
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context->echo_index = MAX_TX_URBS;
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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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{
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struct esd_usb2 *dev = urb->context;
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int retval;
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int pos = 0;
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int i;
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switch (urb->status) {
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case 0: /* success */
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break;
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case -ENOENT:
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case -ESHUTDOWN:
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return;
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default:
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dev_info(dev->udev->dev.parent,
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"Rx URB aborted (%d)\n", urb->status);
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goto resubmit_urb;
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}
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while (pos < urb->actual_length) {
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struct esd_usb2_msg *msg;
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msg = (struct esd_usb2_msg *)(urb->transfer_buffer + pos);
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switch (msg->msg.hdr.cmd) {
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case CMD_CAN_RX:
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if (msg->msg.rx.net >= dev->net_count) {
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dev_err(dev->udev->dev.parent, "format error\n");
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break;
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}
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esd_usb2_rx_can_msg(dev->nets[msg->msg.rx.net], msg);
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break;
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case CMD_CAN_TX:
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if (msg->msg.txdone.net >= dev->net_count) {
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dev_err(dev->udev->dev.parent, "format error\n");
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break;
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}
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esd_usb2_tx_done_msg(dev->nets[msg->msg.txdone.net],
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msg);
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break;
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}
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pos += msg->msg.hdr.len << 2;
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if (pos > urb->actual_length) {
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dev_err(dev->udev->dev.parent, "format error\n");
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break;
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}
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}
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resubmit_urb:
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usb_fill_bulk_urb(urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
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urb->transfer_buffer, RX_BUFFER_SIZE,
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esd_usb2_read_bulk_callback, dev);
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval == -ENODEV) {
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for (i = 0; i < dev->net_count; i++) {
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if (dev->nets[i])
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netif_device_detach(dev->nets[i]->netdev);
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}
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} else if (retval) {
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dev_err(dev->udev->dev.parent,
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"failed resubmitting read bulk urb: %d\n", retval);
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}
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return;
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}
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/*
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* callback for bulk IN urb
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*/
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static void esd_usb2_write_bulk_callback(struct urb *urb)
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{
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struct esd_tx_urb_context *context = urb->context;
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struct esd_usb2_net_priv *priv;
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struct esd_usb2 *dev;
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struct net_device *netdev;
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size_t size = sizeof(struct esd_usb2_msg);
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WARN_ON(!context);
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priv = context->priv;
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netdev = priv->netdev;
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dev = priv->usb2;
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/* free up our allocated buffer */
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usb_free_coherent(urb->dev, size,
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urb->transfer_buffer, urb->transfer_dma);
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if (!netif_device_present(netdev))
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return;
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if (urb->status)
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netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
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netdev->trans_start = jiffies;
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}
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static ssize_t show_firmware(struct device *d,
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struct device_attribute *attr, char *buf)
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{
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struct usb_interface *intf = to_usb_interface(d);
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struct esd_usb2 *dev = usb_get_intfdata(intf);
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return sprintf(buf, "%d.%d.%d\n",
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(dev->version >> 12) & 0xf,
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(dev->version >> 8) & 0xf,
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dev->version & 0xff);
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}
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static DEVICE_ATTR(firmware, S_IRUGO, show_firmware, NULL);
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|
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static ssize_t show_hardware(struct device *d,
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struct device_attribute *attr, char *buf)
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{
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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(hardware, S_IRUGO, show_hardware, NULL);
|
|
|
|
static ssize_t show_nets(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(nets, S_IRUGO, show_nets, NULL);
|
|
|
|
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;
|
|
|
|
/* create a URB, and a buffer for it */
|
|
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,
|
|
&urb->transfer_dma);
|
|
if (!buf) {
|
|
dev_warn(dev->udev->dev.parent,
|
|
"No memory left for USB buffer\n");
|
|
err = -ENOMEM;
|
|
goto freeurb;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 < 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) {
|
|
netdev_err(netdev, "No memory left for URBs\n");
|
|
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 = cf->can_dlc;
|
|
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->can_dlc; i++)
|
|
msg->msg.tx.data[i] = cf->data[i];
|
|
|
|
msg->msg.hdr.len += (cf->can_dlc + 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->dlc = cf->can_dlc;
|
|
|
|
/* 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);
|
|
|
|
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);
|
|
|
|
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;
|
|
}
|
|
|
|
netdev->trans_start = jiffies;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
/* 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);
|