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OpenCloudOS-Kernel/drivers/net/can/usb/mcba_usb.c

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/* SocketCAN driver for Microchip CAN BUS Analyzer Tool
*
* Copyright (C) 2017 Mobica Limited
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published
* by the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program.
*
* This driver is inspired by the 4.6.2 version of net/can/usb/usb_8dev.c
*/
#include <asm/unaligned.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
#include <linux/can/led.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/usb.h>
/* vendor and product id */
#define MCBA_MODULE_NAME "mcba_usb"
#define MCBA_VENDOR_ID 0x04d8
#define MCBA_PRODUCT_ID 0x0a30
/* driver constants */
#define MCBA_MAX_RX_URBS 20
#define MCBA_MAX_TX_URBS 20
#define MCBA_CTX_FREE MCBA_MAX_TX_URBS
/* RX buffer must be bigger than msg size since at the
* beggining USB messages are stacked.
*/
#define MCBA_USB_RX_BUFF_SIZE 64
#define MCBA_USB_TX_BUFF_SIZE (sizeof(struct mcba_usb_msg))
/* MCBA endpoint numbers */
#define MCBA_USB_EP_IN 1
#define MCBA_USB_EP_OUT 1
/* Microchip command id */
#define MBCA_CMD_RECEIVE_MESSAGE 0xE3
#define MBCA_CMD_I_AM_ALIVE_FROM_CAN 0xF5
#define MBCA_CMD_I_AM_ALIVE_FROM_USB 0xF7
#define MBCA_CMD_CHANGE_BIT_RATE 0xA1
#define MBCA_CMD_TRANSMIT_MESSAGE_EV 0xA3
#define MBCA_CMD_SETUP_TERMINATION_RESISTANCE 0xA8
#define MBCA_CMD_READ_FW_VERSION 0xA9
#define MBCA_CMD_NOTHING_TO_SEND 0xFF
#define MBCA_CMD_TRANSMIT_MESSAGE_RSP 0xE2
#define MCBA_VER_REQ_USB 1
#define MCBA_VER_REQ_CAN 2
#define MCBA_SIDL_EXID_MASK 0x8
#define MCBA_DLC_MASK 0xf
#define MCBA_DLC_RTR_MASK 0x40
#define MCBA_CAN_STATE_WRN_TH 95
#define MCBA_CAN_STATE_ERR_PSV_TH 127
#define MCBA_TERMINATION_DISABLED CAN_TERMINATION_DISABLED
#define MCBA_TERMINATION_ENABLED 120
struct mcba_usb_ctx {
struct mcba_priv *priv;
u32 ndx;
u8 dlc;
bool can;
};
/* Structure to hold all of our device specific stuff */
struct mcba_priv {
struct can_priv can; /* must be the first member */
struct sk_buff *echo_skb[MCBA_MAX_TX_URBS];
struct mcba_usb_ctx tx_context[MCBA_MAX_TX_URBS];
struct usb_device *udev;
struct net_device *netdev;
struct usb_anchor tx_submitted;
struct usb_anchor rx_submitted;
struct can_berr_counter bec;
bool usb_ka_first_pass;
bool can_ka_first_pass;
bool can_speed_check;
atomic_t free_ctx_cnt;
};
/* CAN frame */
struct __packed mcba_usb_msg_can {
u8 cmd_id;
__be16 eid;
__be16 sid;
u8 dlc;
u8 data[8];
u8 timestamp[4];
u8 checksum;
};
/* command frame */
struct __packed mcba_usb_msg {
u8 cmd_id;
u8 unused[18];
};
struct __packed mcba_usb_msg_ka_usb {
u8 cmd_id;
u8 termination_state;
u8 soft_ver_major;
u8 soft_ver_minor;
u8 unused[15];
};
struct __packed mcba_usb_msg_ka_can {
u8 cmd_id;
u8 tx_err_cnt;
u8 rx_err_cnt;
u8 rx_buff_ovfl;
u8 tx_bus_off;
__be16 can_bitrate;
__le16 rx_lost;
u8 can_stat;
u8 soft_ver_major;
u8 soft_ver_minor;
u8 debug_mode;
u8 test_complete;
u8 test_result;
u8 unused[4];
};
struct __packed mcba_usb_msg_change_bitrate {
u8 cmd_id;
__be16 bitrate;
u8 unused[16];
};
struct __packed mcba_usb_msg_termination {
u8 cmd_id;
u8 termination;
u8 unused[17];
};
struct __packed mcba_usb_msg_fw_ver {
u8 cmd_id;
u8 pic;
u8 unused[17];
};
static const struct usb_device_id mcba_usb_table[] = {
{ USB_DEVICE(MCBA_VENDOR_ID, MCBA_PRODUCT_ID) },
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, mcba_usb_table);
static const u16 mcba_termination[] = { MCBA_TERMINATION_DISABLED,
MCBA_TERMINATION_ENABLED };
static const u32 mcba_bitrate[] = { 20000, 33333, 50000, 80000, 83333,
100000, 125000, 150000, 175000, 200000,
225000, 250000, 275000, 300000, 500000,
625000, 800000, 1000000 };
static inline void mcba_init_ctx(struct mcba_priv *priv)
{
int i = 0;
for (i = 0; i < MCBA_MAX_TX_URBS; i++) {
priv->tx_context[i].ndx = MCBA_CTX_FREE;
priv->tx_context[i].priv = priv;
}
atomic_set(&priv->free_ctx_cnt, ARRAY_SIZE(priv->tx_context));
}
static inline struct mcba_usb_ctx *mcba_usb_get_free_ctx(struct mcba_priv *priv,
struct can_frame *cf)
{
int i = 0;
struct mcba_usb_ctx *ctx = NULL;
for (i = 0; i < MCBA_MAX_TX_URBS; i++) {
if (priv->tx_context[i].ndx == MCBA_CTX_FREE) {
ctx = &priv->tx_context[i];
ctx->ndx = i;
if (cf) {
ctx->can = true;
ctx->dlc = cf->can_dlc;
} else {
ctx->can = false;
ctx->dlc = 0;
}
atomic_dec(&priv->free_ctx_cnt);
break;
}
}
if (!atomic_read(&priv->free_ctx_cnt))
/* That was the last free ctx. Slow down tx path */
netif_stop_queue(priv->netdev);
return ctx;
}
/* mcba_usb_free_ctx and mcba_usb_get_free_ctx are executed by different
* threads. The order of execution in below function is important.
*/
static inline void mcba_usb_free_ctx(struct mcba_usb_ctx *ctx)
{
/* Increase number of free ctxs before freeing ctx */
atomic_inc(&ctx->priv->free_ctx_cnt);
ctx->ndx = MCBA_CTX_FREE;
/* Wake up the queue once ctx is marked free */
netif_wake_queue(ctx->priv->netdev);
}
static void mcba_usb_write_bulk_callback(struct urb *urb)
{
struct mcba_usb_ctx *ctx = urb->context;
struct net_device *netdev;
WARN_ON(!ctx);
netdev = ctx->priv->netdev;
/* free up our allocated buffer */
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
if (ctx->can) {
if (!netif_device_present(netdev))
return;
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += ctx->dlc;
can_led_event(netdev, CAN_LED_EVENT_TX);
can_get_echo_skb(netdev, ctx->ndx);
}
if (urb->status)
netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
/* Release the context */
mcba_usb_free_ctx(ctx);
}
/* Send data to device */
static netdev_tx_t mcba_usb_xmit(struct mcba_priv *priv,
struct mcba_usb_msg *usb_msg,
struct mcba_usb_ctx *ctx)
{
struct urb *urb;
u8 *buf;
int err;
/* create a URB, and a buffer for it, and copy the data to the URB */
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb)
return -ENOMEM;
buf = usb_alloc_coherent(priv->udev, MCBA_USB_TX_BUFF_SIZE, GFP_ATOMIC,
&urb->transfer_dma);
if (!buf) {
err = -ENOMEM;
goto nomembuf;
}
memcpy(buf, usb_msg, MCBA_USB_TX_BUFF_SIZE);
usb_fill_bulk_urb(urb, priv->udev,
usb_sndbulkpipe(priv->udev, MCBA_USB_EP_OUT), buf,
MCBA_USB_TX_BUFF_SIZE, mcba_usb_write_bulk_callback,
ctx);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &priv->tx_submitted);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (unlikely(err))
goto failed;
/* Release our reference to this URB, the USB core will eventually free
* it entirely.
*/
usb_free_urb(urb);
return 0;
failed:
usb_unanchor_urb(urb);
usb_free_coherent(priv->udev, MCBA_USB_TX_BUFF_SIZE, buf,
urb->transfer_dma);
if (err == -ENODEV)
netif_device_detach(priv->netdev);
else
netdev_warn(priv->netdev, "failed tx_urb %d\n", err);
nomembuf:
usb_free_urb(urb);
return err;
}
/* Send data to device */
static netdev_tx_t mcba_usb_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct mcba_priv *priv = netdev_priv(netdev);
struct can_frame *cf = (struct can_frame *)skb->data;
struct mcba_usb_ctx *ctx = NULL;
struct net_device_stats *stats = &priv->netdev->stats;
u16 sid;
int err;
struct mcba_usb_msg_can usb_msg = {
.cmd_id = MBCA_CMD_TRANSMIT_MESSAGE_EV
};
if (can_dropped_invalid_skb(netdev, skb))
return NETDEV_TX_OK;
ctx = mcba_usb_get_free_ctx(priv, cf);
if (!ctx)
return NETDEV_TX_BUSY;
can_put_echo_skb(skb, priv->netdev, ctx->ndx);
if (cf->can_id & CAN_EFF_FLAG) {
/* SIDH | SIDL | EIDH | EIDL
* 28 - 21 | 20 19 18 x x x 17 16 | 15 - 8 | 7 - 0
*/
sid = MCBA_SIDL_EXID_MASK;
/* store 28-18 bits */
sid |= (cf->can_id & 0x1ffc0000) >> 13;
/* store 17-16 bits */
sid |= (cf->can_id & 0x30000) >> 16;
put_unaligned_be16(sid, &usb_msg.sid);
/* store 15-0 bits */
put_unaligned_be16(cf->can_id & 0xffff, &usb_msg.eid);
} else {
/* SIDH | SIDL
* 10 - 3 | 2 1 0 x x x x x
*/
put_unaligned_be16((cf->can_id & CAN_SFF_MASK) << 5,
&usb_msg.sid);
usb_msg.eid = 0;
}
usb_msg.dlc = cf->can_dlc;
memcpy(usb_msg.data, cf->data, usb_msg.dlc);
if (cf->can_id & CAN_RTR_FLAG)
usb_msg.dlc |= MCBA_DLC_RTR_MASK;
err = mcba_usb_xmit(priv, (struct mcba_usb_msg *)&usb_msg, ctx);
if (err)
goto xmit_failed;
return NETDEV_TX_OK;
xmit_failed:
can_free_echo_skb(priv->netdev, ctx->ndx);
mcba_usb_free_ctx(ctx);
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
/* Send cmd to device */
static void mcba_usb_xmit_cmd(struct mcba_priv *priv,
struct mcba_usb_msg *usb_msg)
{
struct mcba_usb_ctx *ctx = NULL;
int err;
ctx = mcba_usb_get_free_ctx(priv, NULL);
if (!ctx) {
netdev_err(priv->netdev,
"Lack of free ctx. Sending (%d) cmd aborted",
usb_msg->cmd_id);
return;
}
err = mcba_usb_xmit(priv, usb_msg, ctx);
if (err)
netdev_err(priv->netdev, "Failed to send cmd (%d)",
usb_msg->cmd_id);
}
static void mcba_usb_xmit_change_bitrate(struct mcba_priv *priv, u16 bitrate)
{
struct mcba_usb_msg_change_bitrate usb_msg = {
.cmd_id = MBCA_CMD_CHANGE_BIT_RATE
};
put_unaligned_be16(bitrate, &usb_msg.bitrate);
mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
}
static void mcba_usb_xmit_read_fw_ver(struct mcba_priv *priv, u8 pic)
{
struct mcba_usb_msg_fw_ver usb_msg = {
.cmd_id = MBCA_CMD_READ_FW_VERSION,
.pic = pic
};
mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
}
static void mcba_usb_process_can(struct mcba_priv *priv,
struct mcba_usb_msg_can *msg)
{
struct can_frame *cf;
struct sk_buff *skb;
struct net_device_stats *stats = &priv->netdev->stats;
u16 sid;
skb = alloc_can_skb(priv->netdev, &cf);
if (!skb)
return;
sid = get_unaligned_be16(&msg->sid);
if (sid & MCBA_SIDL_EXID_MASK) {
/* SIDH | SIDL | EIDH | EIDL
* 28 - 21 | 20 19 18 x x x 17 16 | 15 - 8 | 7 - 0
*/
cf->can_id = CAN_EFF_FLAG;
/* store 28-18 bits */
cf->can_id |= (sid & 0xffe0) << 13;
/* store 17-16 bits */
cf->can_id |= (sid & 3) << 16;
/* store 15-0 bits */
cf->can_id |= get_unaligned_be16(&msg->eid);
} else {
/* SIDH | SIDL
* 10 - 3 | 2 1 0 x x x x x
*/
cf->can_id = (sid & 0xffe0) >> 5;
}
if (msg->dlc & MCBA_DLC_RTR_MASK)
cf->can_id |= CAN_RTR_FLAG;
cf->can_dlc = get_can_dlc(msg->dlc & MCBA_DLC_MASK);
memcpy(cf->data, msg->data, cf->can_dlc);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
can_led_event(priv->netdev, CAN_LED_EVENT_RX);
netif_rx(skb);
}
static void mcba_usb_process_ka_usb(struct mcba_priv *priv,
struct mcba_usb_msg_ka_usb *msg)
{
if (unlikely(priv->usb_ka_first_pass)) {
netdev_info(priv->netdev, "PIC USB version %hhu.%hhu\n",
msg->soft_ver_major, msg->soft_ver_minor);
priv->usb_ka_first_pass = false;
}
if (msg->termination_state)
priv->can.termination = MCBA_TERMINATION_ENABLED;
else
priv->can.termination = MCBA_TERMINATION_DISABLED;
}
static u32 convert_can2host_bitrate(struct mcba_usb_msg_ka_can *msg)
{
const u32 bitrate = get_unaligned_be16(&msg->can_bitrate);
if ((bitrate == 33) || (bitrate == 83))
return bitrate * 1000 + 333;
else
return bitrate * 1000;
}
static void mcba_usb_process_ka_can(struct mcba_priv *priv,
struct mcba_usb_msg_ka_can *msg)
{
if (unlikely(priv->can_ka_first_pass)) {
netdev_info(priv->netdev, "PIC CAN version %hhu.%hhu\n",
msg->soft_ver_major, msg->soft_ver_minor);
priv->can_ka_first_pass = false;
}
if (unlikely(priv->can_speed_check)) {
const u32 bitrate = convert_can2host_bitrate(msg);
priv->can_speed_check = false;
if (bitrate != priv->can.bittiming.bitrate)
netdev_err(
priv->netdev,
"Wrong bitrate reported by the device (%u). Expected %u",
bitrate, priv->can.bittiming.bitrate);
}
priv->bec.txerr = msg->tx_err_cnt;
priv->bec.rxerr = msg->rx_err_cnt;
if (msg->tx_bus_off)
priv->can.state = CAN_STATE_BUS_OFF;
else if ((priv->bec.txerr > MCBA_CAN_STATE_ERR_PSV_TH) ||
(priv->bec.rxerr > MCBA_CAN_STATE_ERR_PSV_TH))
priv->can.state = CAN_STATE_ERROR_PASSIVE;
else if ((priv->bec.txerr > MCBA_CAN_STATE_WRN_TH) ||
(priv->bec.rxerr > MCBA_CAN_STATE_WRN_TH))
priv->can.state = CAN_STATE_ERROR_WARNING;
}
static void mcba_usb_process_rx(struct mcba_priv *priv,
struct mcba_usb_msg *msg)
{
switch (msg->cmd_id) {
case MBCA_CMD_I_AM_ALIVE_FROM_CAN:
mcba_usb_process_ka_can(priv,
(struct mcba_usb_msg_ka_can *)msg);
break;
case MBCA_CMD_I_AM_ALIVE_FROM_USB:
mcba_usb_process_ka_usb(priv,
(struct mcba_usb_msg_ka_usb *)msg);
break;
case MBCA_CMD_RECEIVE_MESSAGE:
mcba_usb_process_can(priv, (struct mcba_usb_msg_can *)msg);
break;
case MBCA_CMD_NOTHING_TO_SEND:
/* Side effect of communication between PIC_USB and PIC_CAN.
* PIC_CAN is telling us that it has nothing to send
*/
break;
case MBCA_CMD_TRANSMIT_MESSAGE_RSP:
/* Transmission response from the device containing timestamp */
break;
default:
netdev_warn(priv->netdev, "Unsupported msg (0x%hhX)",
msg->cmd_id);
break;
}
}
/* Callback for reading data from device
*
* Check urb status, call read function and resubmit urb read operation.
*/
static void mcba_usb_read_bulk_callback(struct urb *urb)
{
struct mcba_priv *priv = urb->context;
struct net_device *netdev;
int retval;
int pos = 0;
netdev = priv->netdev;
if (!netif_device_present(netdev))
return;
switch (urb->status) {
case 0: /* success */
break;
case -ENOENT:
case -EPIPE:
case -EPROTO:
case -ESHUTDOWN:
return;
default:
netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status);
goto resubmit_urb;
}
while (pos < urb->actual_length) {
struct mcba_usb_msg *msg;
if (pos + sizeof(struct mcba_usb_msg) > urb->actual_length) {
netdev_err(priv->netdev, "format error\n");
break;
}
msg = (struct mcba_usb_msg *)(urb->transfer_buffer + pos);
mcba_usb_process_rx(priv, msg);
pos += sizeof(struct mcba_usb_msg);
}
resubmit_urb:
usb_fill_bulk_urb(urb, priv->udev,
usb_rcvbulkpipe(priv->udev, MCBA_USB_EP_OUT),
urb->transfer_buffer, MCBA_USB_RX_BUFF_SIZE,
mcba_usb_read_bulk_callback, priv);
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval == -ENODEV)
netif_device_detach(netdev);
else if (retval)
netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
retval);
}
/* Start USB device */
static int mcba_usb_start(struct mcba_priv *priv)
{
struct net_device *netdev = priv->netdev;
int err, i;
mcba_init_ctx(priv);
for (i = 0; i < MCBA_MAX_RX_URBS; i++) {
struct urb *urb = NULL;
u8 *buf;
/* create a URB, and a buffer for it */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
err = -ENOMEM;
break;
}
buf = usb_alloc_coherent(priv->udev, MCBA_USB_RX_BUFF_SIZE,
GFP_KERNEL, &urb->transfer_dma);
if (!buf) {
netdev_err(netdev, "No memory left for USB buffer\n");
usb_free_urb(urb);
err = -ENOMEM;
break;
}
usb_fill_bulk_urb(urb, priv->udev,
usb_rcvbulkpipe(priv->udev, MCBA_USB_EP_IN),
buf, MCBA_USB_RX_BUFF_SIZE,
mcba_usb_read_bulk_callback, priv);
urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
usb_anchor_urb(urb, &priv->rx_submitted);
err = usb_submit_urb(urb, GFP_KERNEL);
if (err) {
usb_unanchor_urb(urb);
usb_free_coherent(priv->udev, MCBA_USB_RX_BUFF_SIZE,
buf, urb->transfer_dma);
usb_free_urb(urb);
break;
}
/* Drop reference, USB core will take care of freeing it */
usb_free_urb(urb);
}
/* Did we submit any URBs */
if (i == 0) {
netdev_warn(netdev, "couldn't setup read URBs\n");
return err;
}
/* Warn if we've couldn't transmit all the URBs */
if (i < MCBA_MAX_RX_URBS)
netdev_warn(netdev, "rx performance may be slow\n");
mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_USB);
mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_CAN);
return err;
}
/* Open USB device */
static int mcba_usb_open(struct net_device *netdev)
{
struct mcba_priv *priv = netdev_priv(netdev);
int err;
/* common open */
err = open_candev(netdev);
if (err)
return err;
priv->can_speed_check = true;
priv->can.state = CAN_STATE_ERROR_ACTIVE;
can_led_event(netdev, CAN_LED_EVENT_OPEN);
netif_start_queue(netdev);
return 0;
}
static void mcba_urb_unlink(struct mcba_priv *priv)
{
usb_kill_anchored_urbs(&priv->rx_submitted);
usb_kill_anchored_urbs(&priv->tx_submitted);
}
/* Close USB device */
static int mcba_usb_close(struct net_device *netdev)
{
struct mcba_priv *priv = netdev_priv(netdev);
priv->can.state = CAN_STATE_STOPPED;
netif_stop_queue(netdev);
/* Stop polling */
mcba_urb_unlink(priv);
close_candev(netdev);
can_led_event(netdev, CAN_LED_EVENT_STOP);
return 0;
}
/* Set network device mode
*
* Maybe we should leave this function empty, because the device
* set mode variable with open command.
*/
static int mcba_net_set_mode(struct net_device *netdev, enum can_mode mode)
{
return 0;
}
static int mcba_net_get_berr_counter(const struct net_device *netdev,
struct can_berr_counter *bec)
{
struct mcba_priv *priv = netdev_priv(netdev);
bec->txerr = priv->bec.txerr;
bec->rxerr = priv->bec.rxerr;
return 0;
}
static const struct net_device_ops mcba_netdev_ops = {
.ndo_open = mcba_usb_open,
.ndo_stop = mcba_usb_close,
.ndo_start_xmit = mcba_usb_start_xmit,
};
/* Microchip CANBUS has hardcoded bittiming values by default.
* This function sends request via USB to change the speed and align bittiming
* values for presentation purposes only
*/
static int mcba_net_set_bittiming(struct net_device *netdev)
{
struct mcba_priv *priv = netdev_priv(netdev);
const u16 bitrate_kbps = priv->can.bittiming.bitrate / 1000;
mcba_usb_xmit_change_bitrate(priv, bitrate_kbps);
return 0;
}
static int mcba_set_termination(struct net_device *netdev, u16 term)
{
struct mcba_priv *priv = netdev_priv(netdev);
struct mcba_usb_msg_termination usb_msg = {
.cmd_id = MBCA_CMD_SETUP_TERMINATION_RESISTANCE
};
if (term == MCBA_TERMINATION_ENABLED)
usb_msg.termination = 1;
else
usb_msg.termination = 0;
mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
return 0;
}
static int mcba_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct net_device *netdev;
struct mcba_priv *priv;
int err = -ENOMEM;
struct usb_device *usbdev = interface_to_usbdev(intf);
netdev = alloc_candev(sizeof(struct mcba_priv), MCBA_MAX_TX_URBS);
if (!netdev) {
dev_err(&intf->dev, "Couldn't alloc candev\n");
return -ENOMEM;
}
priv = netdev_priv(netdev);
priv->udev = usbdev;
priv->netdev = netdev;
priv->usb_ka_first_pass = true;
priv->can_ka_first_pass = true;
priv->can_speed_check = false;
init_usb_anchor(&priv->rx_submitted);
init_usb_anchor(&priv->tx_submitted);
usb_set_intfdata(intf, priv);
/* Init CAN device */
priv->can.state = CAN_STATE_STOPPED;
priv->can.termination_const = mcba_termination;
priv->can.termination_const_cnt = ARRAY_SIZE(mcba_termination);
priv->can.bitrate_const = mcba_bitrate;
priv->can.bitrate_const_cnt = ARRAY_SIZE(mcba_bitrate);
priv->can.do_set_termination = mcba_set_termination;
priv->can.do_set_mode = mcba_net_set_mode;
priv->can.do_get_berr_counter = mcba_net_get_berr_counter;
priv->can.do_set_bittiming = mcba_net_set_bittiming;
netdev->netdev_ops = &mcba_netdev_ops;
netdev->flags |= IFF_ECHO; /* we support local echo */
SET_NETDEV_DEV(netdev, &intf->dev);
err = register_candev(netdev);
if (err) {
netdev_err(netdev, "couldn't register CAN device: %d\n", err);
goto cleanup_free_candev;
}
devm_can_led_init(netdev);
/* Start USB dev only if we have successfully registered CAN device */
err = mcba_usb_start(priv);
if (err) {
if (err == -ENODEV)
netif_device_detach(priv->netdev);
netdev_warn(netdev, "couldn't start device: %d\n", err);
goto cleanup_unregister_candev;
}
dev_info(&intf->dev, "Microchip CAN BUS Analyzer connected\n");
return 0;
cleanup_unregister_candev:
unregister_candev(priv->netdev);
cleanup_free_candev:
free_candev(netdev);
return err;
}
/* Called by the usb core when driver is unloaded or device is removed */
static void mcba_usb_disconnect(struct usb_interface *intf)
{
struct mcba_priv *priv = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
netdev_info(priv->netdev, "device disconnected\n");
unregister_candev(priv->netdev);
free_candev(priv->netdev);
mcba_urb_unlink(priv);
}
static struct usb_driver mcba_usb_driver = {
.name = MCBA_MODULE_NAME,
.probe = mcba_usb_probe,
.disconnect = mcba_usb_disconnect,
.id_table = mcba_usb_table,
};
module_usb_driver(mcba_usb_driver);
MODULE_AUTHOR("Remigiusz Kołłątaj <remigiusz.kollataj@mobica.com>");
MODULE_DESCRIPTION("SocketCAN driver for Microchip CAN BUS Analyzer Tool");
MODULE_LICENSE("GPL v2");
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