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mcba_usb.c
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mcba_usb.c
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/* SocketCAN driver for Microchip CAN BUS Analyzer Tool
*
* Copyright (C) 2016 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 <linux/signal.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/usb.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
/* 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
/* Not required by driver itself as CANBUS is USB based
* Used internally by candev for bitrate calculation
*/
#define MCBA_CAN_CLOCK 40000000
/* 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
/* debug module parameter handling */
#define MCBA_PARAM_DEBUG_DISABLE 0
#define MCBA_PARAM_DEBUG_USB 1
#define MCBA_PARAM_DEBUG_CAN 2
#define MCBA_IS_USB_DEBUG() (debug & MCBA_PARAM_DEBUG_USB)
#define MCBA_IS_CAN_DEBUG() (debug & MCBA_PARAM_DEBUG_CAN)
#define MCBA_VER_REQ_USB 1
#define MCBA_VER_REQ_CAN 2
#define MCBA_CAN_S_SID0_SID2_MASK 0x7
#define MCBA_CAN_S_SID3_SID10_MASK 0x7F8
#define MCBA_CAN_S_SID3_SID10_SHIFT 3
#define MCBA_CAN_EID0_EID7_MASK 0xff
#define MCBA_CAN_EID8_EID15_MASK 0xff00
#define MCBA_CAN_EID16_EID17_MASK 0x30000
#define MCBA_CAN_E_SID0_SID2_MASK 0x1c0000
#define MCBA_CAN_E_SID3_SID10_MASK 0x1fe00000
#define MCBA_CAN_EID8_EID15_SHIFT 8
#define MCBA_CAN_EID16_EID17_SHIFT 16
#define MCBA_CAN_E_SID0_SID2_SHIFT 18
#define MCBA_CAN_E_SID3_SID10_SHIFT 21
#define MCBA_SIDL_SID0_SID2_MASK 0xe0
#define MCBA_SIDL_EXID_MASK 0x8
#define MCBA_SIDL_EID16_EID17_MASK 0x3
#define MCBA_SIDL_SID0_SID2_SHIFT 5
#define MCBA_DLC_MASK 0xf
#define MCBA_DLC_RTR_MASK 0x40
#define MCBA_CAN_RTR_MASK 0x40000000
#define MCBA_CAN_EXID_MASK 0x80000000
#define MCBA_SET_S_SIDL(can_id)\
(((can_id) & MCBA_CAN_S_SID0_SID2_MASK) << MCBA_SIDL_SID0_SID2_SHIFT)
#define MCBA_SET_E_SIDL(can_id)\
(((((can_id) & MCBA_CAN_E_SID0_SID2_MASK) >> MCBA_CAN_E_SID0_SID2_SHIFT)\
<< MCBA_SIDL_SID0_SID2_SHIFT) |\
(((can_id) & MCBA_CAN_EID16_EID17_MASK) >> MCBA_CAN_EID16_EID17_SHIFT) |\
MCBA_SIDL_EXID_MASK)
#define MCBA_SET_S_SIDH(can_id)\
(((can_id) & MCBA_CAN_S_SID3_SID10_MASK) >> MCBA_CAN_S_SID3_SID10_SHIFT)
#define MCBA_SET_E_SIDH(can_id)\
(((can_id) & MCBA_CAN_E_SID3_SID10_MASK) >> MCBA_CAN_E_SID3_SID10_SHIFT)
#define MCBA_SET_EIDL(can_id)\
((can_id) & MCBA_CAN_EID0_EID7_MASK)
#define MCBA_SET_EIDH(can_id)\
(((can_id) & MCBA_CAN_EID8_EID15_MASK) >> MCBA_CAN_EID8_EID15_SHIFT)
#define MCBA_CAN_GET_SID(usb_msg)\
((((usb_msg)->sidl & MCBA_SIDL_SID0_SID2_MASK) >> MCBA_SIDL_SID0_SID2_SHIFT) |\
((usb_msg)->sidh << MCBA_CAN_S_SID3_SID10_SHIFT))
#define MCBA_CAN_GET_EID(usb_msg)\
((((usb_msg)->sidh << MCBA_CAN_E_SID3_SID10_SHIFT) |\
(((usb_msg)->sidl & MCBA_SIDL_SID0_SID2_MASK) >> MCBA_SIDL_SID0_SID2_SHIFT) \
<< MCBA_CAN_E_SID0_SID2_SHIFT) |\
(((usb_msg)->sidl & MCBA_SIDL_EID16_EID17_MASK) \
<< MCBA_CAN_EID16_EID17_SHIFT) |\
((usb_msg)->eidh << MCBA_CAN_EID8_EID15_SHIFT) |\
(usb_msg)->eidl |\
MCBA_CAN_EXID_MASK)
#define MCBA_RX_IS_EXID(usb_msg) ((usb_msg)->sidl & MCBA_SIDL_EXID_MASK)
#define MCBA_RX_IS_RTR(usb_msg) ((usb_msg)->dlc & MCBA_DLC_RTR_MASK)
#define MCBA_TX_IS_EXID(can_frame) ((can_frame)->can_id & MCBA_CAN_EXID_MASK)
#define MCBA_TX_IS_RTR(can_frame) ((can_frame)->can_id & MCBA_CAN_RTR_MASK)
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;
u8 termination_state;
bool usb_ka_first_pass;
bool can_ka_first_pass;
};
/* command frame */
struct __packed mcba_usb_msg_can {
u8 cmd_id;
u8 eidh;
u8 eidl;
u8 sidh;
u8 sidl;
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;
u8 can_bitrate_hi;
u8 can_bitrate_lo;
u8 rx_lost_lo;
u8 rx_lost_hi;
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;
u8 bitrate_hi;
u8 bitrate_lo;
u8 unused[16];
};
struct __packed mcba_usb_msg_terminaton {
u8 cmd_id;
u8 termination;
u8 unused[17];
};
struct __packed mcba_usb_msg_fw_ver {
u8 cmd_id;
u8 pic;
u8 unused[17];
};
struct bitrate_settings {
struct can_bittiming bt;
u16 kbps;
};
/* Required by can-dev but not for the sake of driver as CANBUS is USB based */
static const struct can_bittiming_const mcba_bittiming_const = {
.name = "mcba_usb",
.tseg1_min = 1,
.tseg1_max = 8,
.tseg2_min = 1,
.tseg2_max = 8,
.sjw_max = 4,
.brp_min = 2,
.brp_max = 128,
.brp_inc = 2,
};
/* predefined values hardcoded in device's firmware */
static const struct bitrate_settings br_settings[] = {
{
.bt = {
.bitrate = 19940,
.sample_point = 700,
.tq = 2500,
.prop_seg = 5,
.phase_seg1 = 8,
.phase_seg2 = 6,
.sjw = 1,
.brp = 100,
},
.kbps = 20
},
{
.bt = {
.bitrate = 33333,
.sample_point = 680,
.tq = 1200,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 48,
},
.kbps = 33
},
{
.bt = {
.bitrate = 50000,
.sample_point = 800,
.tq = 1000,
.prop_seg = 8,
.phase_seg1 = 7,
.phase_seg2 = 4,
.sjw = 1,
.brp = 40,
},
.kbps = 50
},
{
.bt = {
.bitrate = 80000,
.sample_point = 680,
.tq = 500,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 20,
},
.kbps = 80
},
{
.bt = {
.bitrate = 83333,
.sample_point = 708,
.tq = 500,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 7,
.sjw = 1,
.brp = 20,
},
.kbps = 83
},
{
.bt = {
.bitrate = 100000,
.sample_point = 700,
.tq = 1000,
.prop_seg = 1,
.phase_seg1 = 5,
.phase_seg2 = 3,
.sjw = 1,
.brp = 40,
},
.kbps = 100
},
{
.bt = {
.bitrate = 125000,
.sample_point = 600,
.tq = 400,
.prop_seg = 3,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 16,
},
.kbps = 125
},
{
.bt = {
.bitrate = 150375,
.sample_point = 789,
.tq = 350,
.prop_seg = 8,
.phase_seg1 = 6,
.phase_seg2 = 4,
.sjw = 1,
.brp = 14,
},
.kbps = 150
},
{
.bt = {
.bitrate = 175438,
.sample_point = 789,
.tq = 300,
.prop_seg = 8,
.phase_seg1 = 6,
.phase_seg2 = 4,
.sjw = 1,
.brp = 12,
},
.kbps = 175
},
{
.bt = {
.bitrate = 200000,
.sample_point = 680,
.tq = 200,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 8,
},
.kbps = 200
},
{
.bt = {
.bitrate = 227272,
.sample_point = 772,
.tq = 200,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 5,
.sjw = 1,
.brp = 8,
},
.kbps = 225
},
{
.bt = {
.bitrate = 250000,
.sample_point = 600,
.tq = 200,
.prop_seg = 3,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 8,
},
.kbps = 250
},
{
.bt = {
.bitrate = 277777,
.sample_point = 708,
.tq = 150,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 7,
.sjw = 1,
.brp = 6,
},
.kbps = 275
},
{
.bt = {
.bitrate = 303030,
.sample_point = 772,
.tq = 150,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 5,
.sjw = 1,
.brp = 6,
},
.kbps = 300
},
{
.bt = {
.bitrate = 500000,
.sample_point = 600,
.tq = 100,
.prop_seg = 3,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 4,
},
.kbps = 500
},
{
.bt = {
.bitrate = 625000,
.sample_point = 750,
.tq = 200,
.prop_seg = 1,
.phase_seg1 = 4,
.phase_seg2 = 2,
.sjw = 1,
.brp = 8,
},
.kbps = 625
},
{
.bt = {
.bitrate = 800000,
.sample_point = 680,
.tq = 50,
.prop_seg = 8,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 2,
},
.kbps = 800
},
{
.bt = {
.bitrate = 1000000,
.sample_point = 600,
.tq = 50,
.prop_seg = 3,
.phase_seg1 = 8,
.phase_seg2 = 8,
.sjw = 1,
.brp = 2,
},
.kbps = 1000
}
};
static int debug;
module_param(debug, int, 0664);
MODULE_PARM_DESC(debug,
"Binary flag to control device debug (keep alive) prints in dmesg. 0='Debug prints disabled' "
__stringify(MCBA_PARAM_DEBUG_USB) "='PIC_USB debugs enabled' "
__stringify(MCBA_PARAM_DEBUG_CAN) "='PIC_CAN debugs enabled'");
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 netdev_tx_t mcba_usb_xmit(struct mcba_priv *priv,
struct mcba_usb_msg *usb_msg,
struct sk_buff *skb);
static void mcba_usb_xmit_cmd(struct mcba_priv *priv,
struct mcba_usb_msg *usb_msg);
static void mcba_usb_xmit_read_fw_ver(struct mcba_priv *priv, u8 pic);
static void mcba_usb_xmit_termination(struct mcba_priv *priv, u8 termination);
static inline void mcba_init_ctx(struct mcba_priv *priv);
static ssize_t termination_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct net_device *netdev = to_net_dev(dev);
struct mcba_priv *priv = netdev_priv(netdev);
return sprintf(buf, "%hhu\n", priv->termination_state);
}
static ssize_t termination_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct net_device *netdev = to_net_dev(dev);
struct mcba_priv *priv = netdev_priv(netdev);
int tmp = -1;
int ret = -1;
ret = kstrtoint(buf, 10, &tmp);
if ((ret == 0) && ((tmp == 0) || (tmp == 1))) {
priv->termination_state = tmp;
mcba_usb_xmit_termination(priv, priv->termination_state);
}
return count;
}
static struct device_attribute termination_attr = {
.attr = {
.name = "termination",
.mode = 0666 },
.show = termination_show,
.store = termination_store
};
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;
skb = alloc_can_skb(priv->netdev, &cf);
if (!skb)
return;
if (MCBA_RX_IS_EXID(msg))
cf->can_id = MCBA_CAN_GET_EID(msg);
else
cf->can_id = MCBA_CAN_GET_SID(msg);
if (MCBA_RX_IS_RTR(msg))
cf->can_id |= MCBA_CAN_RTR_MASK;
cf->can_dlc = msg->dlc & MCBA_DLC_MASK;
memcpy(cf->data, msg->data, cf->can_dlc);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
}
static void mcba_usb_process_ka_usb(struct mcba_priv *priv,
struct mcba_usb_msg_ka_usb *msg)
{
if (unlikely(MCBA_IS_USB_DEBUG())) {
netdev_info(priv->netdev,
"USB_KA: termination %hhu, ver_maj %hhu, soft_min %hhu\n",
msg->termination_state, msg->soft_ver_major,
msg->soft_ver_minor);
}
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;
}
priv->termination_state = msg->termination_state;
}
static void mcba_usb_process_ka_can(struct mcba_priv *priv,
struct mcba_usb_msg_ka_can *msg)
{
if (unlikely(MCBA_IS_CAN_DEBUG())) {
netdev_info(priv->netdev,
"CAN_KA: tx_err_cnt %hhu, rx_err_cnt %hhu, rx_buff_ovfl %hhu, tx_bus_off %hhu, can_bitrate %hu, rx_lost %hu, can_stat %hhu, soft_ver %hhu.%hhu, debug_mode %hhu, test_complete %hhu, test_result %hhu\n",
msg->tx_err_cnt, msg->rx_err_cnt, msg->rx_buff_ovfl,
msg->tx_bus_off,
((msg->can_bitrate_hi << 8) + msg->can_bitrate_lo),
((msg->rx_lost_hi >> 8) + msg->rx_lost_lo),
msg->can_stat, msg->soft_ver_major,
msg->soft_ver_minor,
msg->debug_mode, msg->test_complete,
msg->test_result);
}
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;
}
priv->bec.txerr = msg->tx_err_cnt;
priv->bec.rxerr = msg->rx_err_cnt;
}
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 -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;
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) {
netdev_err(netdev, "No memory left for URBs\n");
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");
priv->can.state = CAN_STATE_ERROR_ACTIVE;
mcba_init_ctx(priv);
mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_USB);
mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_CAN);
return err;
}
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;
}
static inline struct mcba_usb_ctx *mcba_usb_get_free_ctx(struct mcba_priv *priv)
{
int i = 0;
struct mcba_usb_ctx *ctx = 0;
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;
ctx->priv = priv;
break;
}
}
return ctx;
}
static inline void mcba_usb_free_ctx(struct mcba_usb_ctx *ctx)
{
ctx->ndx = MCBA_CTX_FREE;
ctx->priv = 0;
ctx->dlc = 0;
ctx->can = false;
}
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;
if (ctx->can) {
if (!netif_device_present(netdev))
return;
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += ctx->dlc;
can_get_echo_skb(netdev, ctx->ndx);
netif_wake_queue(netdev);
}
/* free up our allocated buffer */
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
if (urb->status)
netdev_info(netdev, "Tx URB aborted (%d)\n",
urb->status);
/* Release context */
mcba_usb_free_ctx(ctx);
}
/* 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_msg_can usb_msg;
usb_msg.cmd_id = MBCA_CMD_TRANSMIT_MESSAGE_EV;
memcpy(usb_msg.data, cf->data, sizeof(usb_msg.data));
if (MCBA_TX_IS_EXID(cf)) {
usb_msg.sidl = MCBA_SET_E_SIDL(cf->can_id);
usb_msg.sidh = MCBA_SET_E_SIDH(cf->can_id);
usb_msg.eidl = MCBA_SET_EIDL(cf->can_id);
usb_msg.eidh = MCBA_SET_EIDH(cf->can_id);
} else {
usb_msg.sidl = MCBA_SET_S_SIDL(cf->can_id);
usb_msg.sidh = MCBA_SET_S_SIDH(cf->can_id);
usb_msg.eidl = 0;
usb_msg.eidh = 0;
}
usb_msg.dlc = cf->can_dlc;
if (MCBA_TX_IS_RTR(cf))
usb_msg.dlc |= MCBA_DLC_RTR_MASK;
return mcba_usb_xmit(priv, (struct mcba_usb_msg *)&usb_msg, skb);
}
/* Send data to device */
static void mcba_usb_xmit_cmd(struct mcba_priv *priv,
struct mcba_usb_msg *usb_msg)
{
mcba_usb_xmit(priv, usb_msg, 0);
}
/* Send data to device */
static netdev_tx_t mcba_usb_xmit(struct mcba_priv *priv,
struct mcba_usb_msg *usb_msg,
struct sk_buff *skb)
{
struct net_device_stats *stats = &priv->netdev->stats;
struct mcba_usb_ctx *ctx = 0;
struct urb *urb;
u8 *buf;
int err;
ctx = mcba_usb_get_free_ctx(priv);
if (!ctx) {
/* Slow down tx path */
netif_stop_queue(priv->netdev);
return NETDEV_TX_BUSY;
}
if (skb) {
ctx->dlc = ((struct mcba_usb_msg_can *)usb_msg)->dlc
& MCBA_DLC_MASK;
can_put_echo_skb(skb, priv->netdev, ctx->ndx);
ctx->can = true;
} else {
ctx->can = false;
}
/* 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(priv->netdev, "No memory left for URBs\n");
goto nomem;
}
buf = usb_alloc_coherent(priv->udev, MCBA_USB_TX_BUFF_SIZE, GFP_ATOMIC,
&urb->transfer_dma);
if (!buf) {
netdev_err(priv->netdev, "No memory left for USB buffer\n");
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 NETDEV_TX_OK;
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);
nomem:
can_free_echo_skb(priv->netdev, ctx->ndx);
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
static void mcba_usb_xmit_change_bitrate(struct mcba_priv *priv, u16 bitrate)
{
struct mcba_usb_msg_change_bitrate usb_msg;
usb_msg.cmd_id = MBCA_CMD_CHANGE_BIT_RATE;
usb_msg.bitrate_hi = (0xff00 & bitrate) >> 8;
usb_msg.bitrate_lo = (0xff & 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;
usb_msg.cmd_id = MBCA_CMD_READ_FW_VERSION;
usb_msg.pic = pic;
mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
}
static void mcba_usb_xmit_termination(struct mcba_priv *priv, u8 termination)
{
struct mcba_usb_msg_terminaton usb_msg;
usb_msg.cmd_id = MBCA_CMD_SETUP_TERMINATION_RESISTANCE;
usb_msg.termination = termination;