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linux / linux / kernel / git / torvalds / linux / de3db3f883a82c4800f4af0ae2cc3b96a408ee9b / . / drivers / net / can / usb / etas_es58x / es58x_core.c
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// SPDX-License-Identifier: GPL-2.0
/* Driver for ETAS GmbH ES58X USB CAN(-FD) Bus Interfaces.
*
* File es58x_core.c: Core logic to manage the network devices and the
* USB interface.
*
* Copyright (c) 2019 Robert Bosch Engineering and Business Solutions. All rights reserved.
* Copyright (c) 2020 ETAS K.K.. All rights reserved.
* Copyright (c) 2020, 2021 Vincent Mailhol <mailhol.vincent@wanadoo.fr>
*/
#include <linux/ethtool.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/crc16.h>
#include <asm/unaligned.h>
#include "es58x_core.h"
MODULE_AUTHOR("Vincent Mailhol <mailhol.vincent@wanadoo.fr>");
MODULE_AUTHOR("Arunachalam Santhanam <arunachalam.santhanam@in.bosch.com>");
MODULE_DESCRIPTION("Socket CAN driver for ETAS ES58X USB adapters");
MODULE_LICENSE("GPL v2");
#define ES58X_VENDOR_ID 0x108C
#define ES581_4_PRODUCT_ID 0x0159
#define ES582_1_PRODUCT_ID 0x0168
#define ES584_1_PRODUCT_ID 0x0169
/* ES58X FD has some interface protocols unsupported by this driver. */
#define ES58X_FD_INTERFACE_PROTOCOL 0
/* Table of devices which work with this driver. */
static const struct usb_device_id es58x_id_table[] = {
{
/* ETAS GmbH ES581.4 USB dual-channel CAN Bus Interface module. */
USB_DEVICE(ES58X_VENDOR_ID, ES581_4_PRODUCT_ID),
.driver_info = ES58X_DUAL_CHANNEL
}, {
/* ETAS GmbH ES582.1 USB dual-channel CAN FD Bus Interface module. */
USB_DEVICE_INTERFACE_PROTOCOL(ES58X_VENDOR_ID, ES582_1_PRODUCT_ID,
ES58X_FD_INTERFACE_PROTOCOL),
.driver_info = ES58X_DUAL_CHANNEL | ES58X_FD_FAMILY
}, {
/* ETAS GmbH ES584.1 USB single-channel CAN FD Bus Interface module. */
USB_DEVICE_INTERFACE_PROTOCOL(ES58X_VENDOR_ID, ES584_1_PRODUCT_ID,
ES58X_FD_INTERFACE_PROTOCOL),
.driver_info = ES58X_FD_FAMILY
}, {
/* Terminating entry */
}
};
MODULE_DEVICE_TABLE(usb, es58x_id_table);
#define es58x_print_hex_dump(buf, len) \
print_hex_dump(KERN_DEBUG, \
KBUILD_MODNAME " " __stringify(buf) ": ", \
DUMP_PREFIX_NONE, 16, 1, buf, len, false)
#define es58x_print_hex_dump_debug(buf, len) \
print_hex_dump_debug(KBUILD_MODNAME " " __stringify(buf) ": ",\
DUMP_PREFIX_NONE, 16, 1, buf, len, false)
/* The last two bytes of an ES58X command is a CRC16. The first two
* bytes (the start of frame) are skipped and the CRC calculation
* starts on the third byte.
*/
#define ES58X_CRC_CALC_OFFSET sizeof_field(union es58x_urb_cmd, sof)
/**
* es58x_calculate_crc() - Compute the crc16 of a given URB.
* @urb_cmd: The URB command for which we want to calculate the CRC.
* @urb_len: Length of @urb_cmd. Must be at least bigger than 4
* (ES58X_CRC_CALC_OFFSET + sizeof(crc))
*
* Return: crc16 value.
*/
static u16 es58x_calculate_crc(const union es58x_urb_cmd *urb_cmd, u16 urb_len)
{
u16 crc;
ssize_t len = urb_len - ES58X_CRC_CALC_OFFSET - sizeof(crc);
crc = crc16(0, &urb_cmd->raw_cmd[ES58X_CRC_CALC_OFFSET], len);
return crc;
}
/**
* es58x_get_crc() - Get the CRC value of a given URB.
* @urb_cmd: The URB command for which we want to get the CRC.
* @urb_len: Length of @urb_cmd. Must be at least bigger than 4
* (ES58X_CRC_CALC_OFFSET + sizeof(crc))
*
* Return: crc16 value.
*/
static u16 es58x_get_crc(const union es58x_urb_cmd *urb_cmd, u16 urb_len)
{
u16 crc;
const __le16 *crc_addr;
crc_addr = (__le16 *)&urb_cmd->raw_cmd[urb_len - sizeof(crc)];
crc = get_unaligned_le16(crc_addr);
return crc;
}
/**
* es58x_set_crc() - Set the CRC value of a given URB.
* @urb_cmd: The URB command for which we want to get the CRC.
* @urb_len: Length of @urb_cmd. Must be at least bigger than 4
* (ES58X_CRC_CALC_OFFSET + sizeof(crc))
*/
static void es58x_set_crc(union es58x_urb_cmd *urb_cmd, u16 urb_len)
{
u16 crc;
__le16 *crc_addr;
crc = es58x_calculate_crc(urb_cmd, urb_len);
crc_addr = (__le16 *)&urb_cmd->raw_cmd[urb_len - sizeof(crc)];
put_unaligned_le16(crc, crc_addr);
}
/**
* es58x_check_crc() - Validate the CRC value of a given URB.
* @es58x_dev: ES58X device.
* @urb_cmd: The URB command for which we want to check the CRC.
* @urb_len: Length of @urb_cmd. Must be at least bigger than 4
* (ES58X_CRC_CALC_OFFSET + sizeof(crc))
*
* Return: zero on success, -EBADMSG if the CRC check fails.
*/
static int es58x_check_crc(struct es58x_device *es58x_dev,
const union es58x_urb_cmd *urb_cmd, u16 urb_len)
{
u16 calculated_crc = es58x_calculate_crc(urb_cmd, urb_len);
u16 expected_crc = es58x_get_crc(urb_cmd, urb_len);
if (expected_crc != calculated_crc) {
dev_err_ratelimited(es58x_dev->dev,
"%s: Bad CRC, urb_len: %d\n",
__func__, urb_len);
return -EBADMSG;
}
return 0;
}
/**
* es58x_timestamp_to_ns() - Convert a timestamp value received from a
* ES58X device to nanoseconds.
* @timestamp: Timestamp received from a ES58X device.
*
* The timestamp received from ES58X is expressed in multiples of 0.5
* micro seconds. This function converts it in to nanoseconds.
*
* Return: Timestamp value in nanoseconds.
*/
static u64 es58x_timestamp_to_ns(u64 timestamp)
{
const u64 es58x_timestamp_ns_mult_coef = 500ULL;
return es58x_timestamp_ns_mult_coef * timestamp;
}
/**
* es58x_set_skb_timestamp() - Set the hardware timestamp of an skb.
* @netdev: CAN network device.
* @skb: socket buffer of a CAN message.
* @timestamp: Timestamp received from an ES58X device.
*
* Used for both received and echo messages.
*/
static void es58x_set_skb_timestamp(struct net_device *netdev,
struct sk_buff *skb, u64 timestamp)
{
struct es58x_device *es58x_dev = es58x_priv(netdev)->es58x_dev;
struct skb_shared_hwtstamps *hwts;
hwts = skb_hwtstamps(skb);
/* Ignoring overflow (overflow on 64 bits timestamp with nano
* second precision would occur after more than 500 years).
*/
hwts->hwtstamp = ns_to_ktime(es58x_timestamp_to_ns(timestamp) +
es58x_dev->realtime_diff_ns);
}
/**
* es58x_rx_timestamp() - Handle a received timestamp.
* @es58x_dev: ES58X device.
* @timestamp: Timestamp received from a ES58X device.
*
* Calculate the difference between the ES58X device and the kernel
* internal clocks. This difference will be later used as an offset to
* convert the timestamps of RX and echo messages to match the kernel
* system time (e.g. convert to UNIX time).
*/
void es58x_rx_timestamp(struct es58x_device *es58x_dev, u64 timestamp)
{
u64 ktime_real_ns = ktime_get_real_ns();
u64 device_timestamp = es58x_timestamp_to_ns(timestamp);
dev_dbg(es58x_dev->dev, "%s: request round-trip time: %llu ns\n",
__func__, ktime_real_ns - es58x_dev->ktime_req_ns);
es58x_dev->realtime_diff_ns =
(es58x_dev->ktime_req_ns + ktime_real_ns) / 2 - device_timestamp;
es58x_dev->ktime_req_ns = 0;
dev_dbg(es58x_dev->dev,
"%s: Device timestamp: %llu, diff with kernel: %llu\n",
__func__, device_timestamp, es58x_dev->realtime_diff_ns);
}
/**
* es58x_set_realtime_diff_ns() - Calculate difference between the
* clocks of the ES58X device and the kernel
* @es58x_dev: ES58X device.
*
* Request a timestamp from the ES58X device. Once the answer is
* received, the timestamp difference will be set by the callback
* function es58x_rx_timestamp().
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_set_realtime_diff_ns(struct es58x_device *es58x_dev)
{
if (es58x_dev->ktime_req_ns) {
dev_warn(es58x_dev->dev,
"%s: Previous request to set timestamp has not completed yet\n",
__func__);
return -EBUSY;
}
es58x_dev->ktime_req_ns = ktime_get_real_ns();
return es58x_dev->ops->get_timestamp(es58x_dev);
}
/**
* es58x_is_can_state_active() - Is the network device in an active
* CAN state?
* @netdev: CAN network device.
*
* The device is considered active if it is able to send or receive
* CAN frames, that is to say if it is in any of
* CAN_STATE_ERROR_ACTIVE, CAN_STATE_ERROR_WARNING or
* CAN_STATE_ERROR_PASSIVE states.
*
* Caution: when recovering from a bus-off,
* net/core/dev.c#can_restart() will call
* net/core/dev.c#can_flush_echo_skb() without using any kind of
* locks. For this reason, it is critical to guarantee that no TX or
* echo operations (i.e. any access to priv->echo_skb[]) can be done
* while this function is returning false.
*
* Return: true if the device is active, else returns false.
*/
static bool es58x_is_can_state_active(struct net_device *netdev)
{
return es58x_priv(netdev)->can.state < CAN_STATE_BUS_OFF;
}
/**
* es58x_is_echo_skb_threshold_reached() - Determine the limit of how
* many skb slots can be taken before we should stop the network
* queue.
* @priv: ES58X private parameters related to the network device.
*
* We need to save enough free skb slots in order to be able to do
* bulk send. This function can be used to determine when to wake or
* stop the network queue in regard to the number of skb slots already
* taken if the echo FIFO.
*
* Return: boolean.
*/
static bool es58x_is_echo_skb_threshold_reached(struct es58x_priv *priv)
{
u32 num_echo_skb = priv->tx_head - priv->tx_tail;
u32 threshold = priv->can.echo_skb_max -
priv->es58x_dev->param->tx_bulk_max + 1;
return num_echo_skb >= threshold;
}
/**
* es58x_can_free_echo_skb_tail() - Remove the oldest echo skb of the
* echo FIFO.
* @netdev: CAN network device.
*
* Naming convention: the tail is the beginning of the FIFO, i.e. the
* first skb to have entered the FIFO.
*/
static void es58x_can_free_echo_skb_tail(struct net_device *netdev)
{
struct es58x_priv *priv = es58x_priv(netdev);
u16 fifo_mask = priv->es58x_dev->param->fifo_mask;
unsigned int frame_len = 0;
can_free_echo_skb(netdev, priv->tx_tail & fifo_mask, &frame_len);
netdev_completed_queue(netdev, 1, frame_len);
priv->tx_tail++;
netdev->stats.tx_dropped++;
}
/**
* es58x_can_get_echo_skb_recovery() - Try to re-sync the echo FIFO.
* @netdev: CAN network device.
* @rcv_packet_idx: Index
*
* This function should not be called under normal circumstances. In
* the unlikely case that one or several URB packages get dropped by
* the device, the index will get out of sync. Try to recover by
* dropping the echo skb packets with older indexes.
*
* Return: zero if recovery was successful, -EINVAL otherwise.
*/
static int es58x_can_get_echo_skb_recovery(struct net_device *netdev,
u32 rcv_packet_idx)
{
struct es58x_priv *priv = es58x_priv(netdev);
int ret = 0;
netdev->stats.tx_errors++;
if (net_ratelimit())
netdev_warn(netdev,
"Bad echo packet index: %u. First index: %u, end index %u, num_echo_skb: %02u/%02u\n",
rcv_packet_idx, priv->tx_tail, priv->tx_head,
priv->tx_head - priv->tx_tail,
priv->can.echo_skb_max);
if ((s32)(rcv_packet_idx - priv->tx_tail) < 0) {
if (net_ratelimit())
netdev_warn(netdev,
"Received echo index is from the past. Ignoring it\n");
ret = -EINVAL;
} else if ((s32)(rcv_packet_idx - priv->tx_head) >= 0) {
if (net_ratelimit())
netdev_err(netdev,
"Received echo index is from the future. Ignoring it\n");
ret = -EINVAL;
} else {
if (net_ratelimit())
netdev_warn(netdev,
"Recovery: dropping %u echo skb from index %u to %u\n",
rcv_packet_idx - priv->tx_tail,
priv->tx_tail, rcv_packet_idx - 1);
while (priv->tx_tail != rcv_packet_idx) {
if (priv->tx_tail == priv->tx_head)
return -EINVAL;
es58x_can_free_echo_skb_tail(netdev);
}
}
return ret;
}
/**
* es58x_can_get_echo_skb() - Get the skb from the echo FIFO and loop
* it back locally.
* @netdev: CAN network device.
* @rcv_packet_idx: Index of the first packet received from the device.
* @tstamps: Array of hardware timestamps received from a ES58X device.
* @pkts: Number of packets (and so, length of @tstamps).
*
* Callback function for when we receive a self reception
* acknowledgment. Retrieves the skb from the echo FIFO, sets its
* hardware timestamp (the actual time it was sent) and loops it back
* locally.
*
* The device has to be active (i.e. network interface UP and not in
* bus off state or restarting).
*
* Packet indexes must be consecutive (i.e. index of first packet is
* @rcv_packet_idx, index of second packet is @rcv_packet_idx + 1 and
* index of last packet is @rcv_packet_idx + @pkts - 1).
*
* Return: zero on success.
*/
int es58x_can_get_echo_skb(struct net_device *netdev, u32 rcv_packet_idx,
u64 *tstamps, unsigned int pkts)
{
struct es58x_priv *priv = es58x_priv(netdev);
unsigned int rx_total_frame_len = 0;
unsigned int num_echo_skb = priv->tx_head - priv->tx_tail;
int i;
u16 fifo_mask = priv->es58x_dev->param->fifo_mask;
if (!netif_running(netdev)) {
if (net_ratelimit())
netdev_info(netdev,
"%s: %s is down, dropping %d echo packets\n",
__func__, netdev->name, pkts);
netdev->stats.tx_dropped += pkts;
return 0;
} else if (!es58x_is_can_state_active(netdev)) {
if (net_ratelimit())
netdev_dbg(netdev,
"Bus is off or device is restarting. Ignoring %u echo packets from index %u\n",
pkts, rcv_packet_idx);
/* stats.tx_dropped will be (or was already)
* incremented by
* drivers/net/can/net/dev.c:can_flush_echo_skb().
*/
return 0;
} else if (num_echo_skb == 0) {
if (net_ratelimit())
netdev_warn(netdev,
"Received %u echo packets from index: %u but echo skb queue is empty.\n",
pkts, rcv_packet_idx);
netdev->stats.tx_dropped += pkts;
return 0;
}
if (priv->tx_tail != rcv_packet_idx) {
if (es58x_can_get_echo_skb_recovery(netdev, rcv_packet_idx) < 0) {
if (net_ratelimit())
netdev_warn(netdev,
"Could not find echo skb for echo packet index: %u\n",
rcv_packet_idx);
return 0;
}
}
if (num_echo_skb < pkts) {
int pkts_drop = pkts - num_echo_skb;
if (net_ratelimit())
netdev_err(netdev,
"Received %u echo packets but have only %d echo skb. Dropping %d echo skb\n",
pkts, num_echo_skb, pkts_drop);
netdev->stats.tx_dropped += pkts_drop;
pkts -= pkts_drop;
}
for (i = 0; i < pkts; i++) {
unsigned int skb_idx = priv->tx_tail & fifo_mask;
struct sk_buff *skb = priv->can.echo_skb[skb_idx];
unsigned int frame_len = 0;
if (skb)
es58x_set_skb_timestamp(netdev, skb, tstamps[i]);
netdev->stats.tx_bytes += can_get_echo_skb(netdev, skb_idx,
&frame_len);
rx_total_frame_len += frame_len;
priv->tx_tail++;
}
netdev_completed_queue(netdev, pkts, rx_total_frame_len);
netdev->stats.tx_packets += pkts;
priv->err_passive_before_rtx_success = 0;
if (!es58x_is_echo_skb_threshold_reached(priv))
netif_wake_queue(netdev);
return 0;
}
/**
* es58x_can_reset_echo_fifo() - Reset the echo FIFO.
* @netdev: CAN network device.
*
* The echo_skb array of struct can_priv will be flushed by
* drivers/net/can/dev.c:can_flush_echo_skb(). This function resets
* the parameters of the struct es58x_priv of our device and reset the
* queue (c.f. BQL).
*/
static void es58x_can_reset_echo_fifo(struct net_device *netdev)
{
struct es58x_priv *priv = es58x_priv(netdev);
priv->tx_tail = 0;
priv->tx_head = 0;
priv->tx_urb = NULL;
priv->err_passive_before_rtx_success = 0;
netdev_reset_queue(netdev);
}
/**
* es58x_flush_pending_tx_msg() - Reset the buffer for transmission messages.
* @netdev: CAN network device.
*
* es58x_start_xmit() will queue up to tx_bulk_max messages in
* &tx_urb buffer and do a bulk send of all messages in one single URB
* (c.f. xmit_more flag). When the device recovers from a bus off
* state or when the device stops, the tx_urb buffer might still have
* pending messages in it and thus need to be flushed.
*/
static void es58x_flush_pending_tx_msg(struct net_device *netdev)
{
struct es58x_priv *priv = es58x_priv(netdev);
struct es58x_device *es58x_dev = priv->es58x_dev;
if (priv->tx_urb) {
netdev_warn(netdev, "%s: dropping %d TX messages\n",
__func__, priv->tx_can_msg_cnt);
netdev->stats.tx_dropped += priv->tx_can_msg_cnt;
while (priv->tx_can_msg_cnt > 0) {
unsigned int frame_len = 0;
u16 fifo_mask = priv->es58x_dev->param->fifo_mask;
priv->tx_head--;
priv->tx_can_msg_cnt--;
can_free_echo_skb(netdev, priv->tx_head & fifo_mask,
&frame_len);
netdev_completed_queue(netdev, 1, frame_len);
}
usb_anchor_urb(priv->tx_urb, &priv->es58x_dev->tx_urbs_idle);
atomic_inc(&es58x_dev->tx_urbs_idle_cnt);
usb_free_urb(priv->tx_urb);
}
priv->tx_urb = NULL;
}
/**
* es58x_tx_ack_msg() - Handle acknowledgment messages.
* @netdev: CAN network device.
* @tx_free_entries: Number of free entries in the device transmit FIFO.
* @rx_cmd_ret_u32: error code as returned by the ES58X device.
*
* ES58X sends an acknowledgment message after a transmission request
* is done. This is mandatory for the ES581.4 but is optional (and
* deactivated in this driver) for the ES58X_FD family.
*
* Under normal circumstances, this function should never throw an
* error message.
*
* Return: zero on success, errno when any error occurs.
*/
int es58x_tx_ack_msg(struct net_device *netdev, u16 tx_free_entries,
enum es58x_ret_u32 rx_cmd_ret_u32)
{
struct es58x_priv *priv = es58x_priv(netdev);
if (tx_free_entries <= priv->es58x_dev->param->tx_bulk_max) {
if (net_ratelimit())
netdev_err(netdev,
"Only %d entries left in device queue, num_echo_skb: %d/%d\n",
tx_free_entries,
priv->tx_head - priv->tx_tail,
priv->can.echo_skb_max);
netif_stop_queue(netdev);
}
return es58x_rx_cmd_ret_u32(netdev, ES58X_RET_TYPE_TX_MSG,
rx_cmd_ret_u32);
}
/**
* es58x_rx_can_msg() - Handle a received a CAN message.
* @netdev: CAN network device.
* @timestamp: Hardware time stamp (only relevant in rx branches).
* @data: CAN payload.
* @can_id: CAN ID.
* @es58x_flags: Please refer to enum es58x_flag.
* @dlc: Data Length Code (raw value).
*
* Fill up a CAN skb and post it.
*
* This function handles the case where the DLC of a classical CAN
* frame is greater than CAN_MAX_DLEN (c.f. the len8_dlc field of
* struct can_frame).
*
* Return: zero on success.
*/
int es58x_rx_can_msg(struct net_device *netdev, u64 timestamp, const u8 *data,
canid_t can_id, enum es58x_flag es58x_flags, u8 dlc)
{
struct canfd_frame *cfd;
struct can_frame *ccf;
struct sk_buff *skb;
u8 len;
bool is_can_fd = !!(es58x_flags & ES58X_FLAG_FD_DATA);
if (dlc > CAN_MAX_RAW_DLC) {
netdev_err(netdev,
"%s: DLC is %d but maximum should be %d\n",
__func__, dlc, CAN_MAX_RAW_DLC);
return -EMSGSIZE;
}
if (is_can_fd) {
len = can_fd_dlc2len(dlc);
skb = alloc_canfd_skb(netdev, &cfd);
} else {
len = can_cc_dlc2len(dlc);
skb = alloc_can_skb(netdev, &ccf);
cfd = (struct canfd_frame *)ccf;
}
if (!skb) {
netdev->stats.rx_dropped++;
return 0;
}
cfd->can_id = can_id;
if (es58x_flags & ES58X_FLAG_EFF)
cfd->can_id |= CAN_EFF_FLAG;
if (is_can_fd) {
cfd->len = len;
if (es58x_flags & ES58X_FLAG_FD_BRS)
cfd->flags |= CANFD_BRS;
if (es58x_flags & ES58X_FLAG_FD_ESI)
cfd->flags |= CANFD_ESI;
} else {
can_frame_set_cc_len(ccf, dlc, es58x_priv(netdev)->can.ctrlmode);
if (es58x_flags & ES58X_FLAG_RTR) {
ccf->can_id |= CAN_RTR_FLAG;
len = 0;
}
}
memcpy(cfd->data, data, len);
netdev->stats.rx_packets++;
netdev->stats.rx_bytes += len;
es58x_set_skb_timestamp(netdev, skb, timestamp);
netif_rx(skb);
es58x_priv(netdev)->err_passive_before_rtx_success = 0;
return 0;
}
/**
* es58x_rx_err_msg() - Handle a received CAN event or error message.
* @netdev: CAN network device.
* @error: Error code.
* @event: Event code.
* @timestamp: Timestamp received from a ES58X device.
*
* Handle the errors and events received by the ES58X device, create
* a CAN error skb and post it.
*
* In some rare cases the devices might get stuck alternating between
* CAN_STATE_ERROR_PASSIVE and CAN_STATE_ERROR_WARNING. To prevent
* this behavior, we force a bus off state if the device goes in
* CAN_STATE_ERROR_WARNING for ES58X_MAX_CONSECUTIVE_WARN consecutive
* times with no successful transmission or reception in between.
*
* Once the device is in bus off state, the only way to restart it is
* through the drivers/net/can/dev.c:can_restart() function. The
* device is technically capable to recover by itself under certain
* circumstances, however, allowing self recovery would create
* complex race conditions with drivers/net/can/dev.c:can_restart()
* and thus was not implemented. To activate automatic restart, please
* set the restart-ms parameter (e.g. ip link set can0 type can
* restart-ms 100).
*
* If the bus is really instable, this function would try to send a
* lot of log messages. Those are rate limited (i.e. you will see
* messages such as "net_ratelimit: XXX callbacks suppressed" in
* dmesg).
*
* Return: zero on success, errno when any error occurs.
*/
int es58x_rx_err_msg(struct net_device *netdev, enum es58x_err error,
enum es58x_event event, u64 timestamp)
{
struct es58x_priv *priv = es58x_priv(netdev);
struct can_priv *can = netdev_priv(netdev);
struct can_device_stats *can_stats = &can->can_stats;
struct can_frame *cf = NULL;
struct sk_buff *skb;
int ret = 0;
if (!netif_running(netdev)) {
if (net_ratelimit())
netdev_info(netdev, "%s: %s is down, dropping packet\n",
__func__, netdev->name);
netdev->stats.rx_dropped++;
return 0;
}
if (error == ES58X_ERR_OK && event == ES58X_EVENT_OK) {
netdev_err(netdev, "%s: Both error and event are zero\n",
__func__);
return -EINVAL;
}
skb = alloc_can_err_skb(netdev, &cf);
switch (error) {
case ES58X_ERR_OK: /* 0: No error */
break;
case ES58X_ERR_PROT_STUFF:
if (net_ratelimit())
netdev_dbg(netdev, "Error BITSTUFF\n");
if (cf)
cf->data[2] |= CAN_ERR_PROT_STUFF;
break;
case ES58X_ERR_PROT_FORM:
if (net_ratelimit())
netdev_dbg(netdev, "Error FORMAT\n");
if (cf)
cf->data[2] |= CAN_ERR_PROT_FORM;
break;
case ES58X_ERR_ACK:
if (net_ratelimit())
netdev_dbg(netdev, "Error ACK\n");
if (cf)
cf->can_id |= CAN_ERR_ACK;
break;
case ES58X_ERR_PROT_BIT:
if (net_ratelimit())
netdev_dbg(netdev, "Error BIT\n");
if (cf)
cf->data[2] |= CAN_ERR_PROT_BIT;
break;
case ES58X_ERR_PROT_CRC:
if (net_ratelimit())
netdev_dbg(netdev, "Error CRC\n");
if (cf)
cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
break;
case ES58X_ERR_PROT_BIT1:
if (net_ratelimit())
netdev_dbg(netdev,
"Error: expected a recessive bit but monitored a dominant one\n");
if (cf)
cf->data[2] |= CAN_ERR_PROT_BIT1;
break;
case ES58X_ERR_PROT_BIT0:
if (net_ratelimit())
netdev_dbg(netdev,
"Error expected a dominant bit but monitored a recessive one\n");
if (cf)
cf->data[2] |= CAN_ERR_PROT_BIT0;
break;
case ES58X_ERR_PROT_OVERLOAD:
if (net_ratelimit())
netdev_dbg(netdev, "Error OVERLOAD\n");
if (cf)
cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
break;
case ES58X_ERR_PROT_UNSPEC:
if (net_ratelimit())
netdev_dbg(netdev, "Unspecified error\n");
if (cf)
cf->can_id |= CAN_ERR_PROT;
break;
default:
if (net_ratelimit())
netdev_err(netdev,
"%s: Unspecified error code 0x%04X\n",
__func__, (int)error);
if (cf)
cf->can_id |= CAN_ERR_PROT;
break;
}
switch (event) {
case ES58X_EVENT_OK: /* 0: No event */
break;
case ES58X_EVENT_CRTL_ACTIVE:
if (can->state == CAN_STATE_BUS_OFF) {
netdev_err(netdev,
"%s: state transition: BUS OFF -> ACTIVE\n",
__func__);
}
if (net_ratelimit())
netdev_dbg(netdev, "Event CAN BUS ACTIVE\n");
if (cf)
cf->data[1] |= CAN_ERR_CRTL_ACTIVE;
can->state = CAN_STATE_ERROR_ACTIVE;
break;
case ES58X_EVENT_CRTL_PASSIVE:
if (net_ratelimit())
netdev_dbg(netdev, "Event CAN BUS PASSIVE\n");
/* Either TX or RX error count reached passive state
* but we do not know which. Setting both flags by
* default.
*/
if (cf) {
cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
}
if (can->state < CAN_STATE_BUS_OFF)
can->state = CAN_STATE_ERROR_PASSIVE;
can_stats->error_passive++;
if (priv->err_passive_before_rtx_success < U8_MAX)
priv->err_passive_before_rtx_success++;
break;
case ES58X_EVENT_CRTL_WARNING:
if (net_ratelimit())
netdev_dbg(netdev, "Event CAN BUS WARNING\n");
/* Either TX or RX error count reached warning state
* but we do not know which. Setting both flags by
* default.
*/
if (cf) {
cf->data[1] |= CAN_ERR_CRTL_RX_WARNING;
cf->data[1] |= CAN_ERR_CRTL_TX_WARNING;
}
if (can->state < CAN_STATE_BUS_OFF)
can->state = CAN_STATE_ERROR_WARNING;
can_stats->error_warning++;
break;
case ES58X_EVENT_BUSOFF:
if (net_ratelimit())
netdev_dbg(netdev, "Event CAN BUS OFF\n");
if (cf)
cf->can_id |= CAN_ERR_BUSOFF;
can_stats->bus_off++;
netif_stop_queue(netdev);
if (can->state != CAN_STATE_BUS_OFF) {
can->state = CAN_STATE_BUS_OFF;
can_bus_off(netdev);
ret = can->do_set_mode(netdev, CAN_MODE_STOP);
}
break;
case ES58X_EVENT_SINGLE_WIRE:
if (net_ratelimit())
netdev_warn(netdev,
"Lost connection on either CAN high or CAN low\n");
/* Lost connection on either CAN high or CAN
* low. Setting both flags by default.
*/
if (cf) {
cf->data[4] |= CAN_ERR_TRX_CANH_NO_WIRE;
cf->data[4] |= CAN_ERR_TRX_CANL_NO_WIRE;
}
break;
default:
if (net_ratelimit())
netdev_err(netdev,
"%s: Unspecified event code 0x%04X\n",
__func__, (int)event);
if (cf)
cf->can_id |= CAN_ERR_CRTL;
break;
}
if (cf) {
if (cf->data[1])
cf->can_id |= CAN_ERR_CRTL;
if (cf->data[2] || cf->data[3]) {
cf->can_id |= CAN_ERR_PROT;
can_stats->bus_error++;
}
if (cf->data[4])
cf->can_id |= CAN_ERR_TRX;
es58x_set_skb_timestamp(netdev, skb, timestamp);
netif_rx(skb);
}
if ((event & ES58X_EVENT_CRTL_PASSIVE) &&
priv->err_passive_before_rtx_success == ES58X_CONSECUTIVE_ERR_PASSIVE_MAX) {
netdev_info(netdev,
"Got %d consecutive warning events with no successful RX or TX. Forcing bus-off\n",
priv->err_passive_before_rtx_success);
return es58x_rx_err_msg(netdev, ES58X_ERR_OK,
ES58X_EVENT_BUSOFF, timestamp);
}
return ret;
}
/**
* es58x_cmd_ret_desc() - Convert a command type to a string.
* @cmd_ret_type: Type of the command which triggered the return code.
*
* The final line (return "<unknown>") should not be reached. If this
* is the case, there is an implementation bug.
*
* Return: a readable description of the @cmd_ret_type.
*/
static const char *es58x_cmd_ret_desc(enum es58x_ret_type cmd_ret_type)
{
switch (cmd_ret_type) {
case ES58X_RET_TYPE_SET_BITTIMING:
return "Set bittiming";
case ES58X_RET_TYPE_ENABLE_CHANNEL:
return "Enable channel";
case ES58X_RET_TYPE_DISABLE_CHANNEL:
return "Disable channel";
case ES58X_RET_TYPE_TX_MSG:
return "Transmit message";
case ES58X_RET_TYPE_RESET_RX:
return "Reset RX";
case ES58X_RET_TYPE_RESET_TX:
return "Reset TX";
case ES58X_RET_TYPE_DEVICE_ERR:
return "Device error";
}
return "<unknown>";
};
/**
* es58x_rx_cmd_ret_u8() - Handle the command's return code received
* from the ES58X device.
* @dev: Device, only used for the dev_XXX() print functions.
* @cmd_ret_type: Type of the command which triggered the return code.
* @rx_cmd_ret_u8: Command error code as returned by the ES58X device.
*
* Handles the 8 bits command return code. Those are specific to the
* ES581.4 device. The return value will eventually be used by
* es58x_handle_urb_cmd() function which will take proper actions in
* case of critical issues such and memory errors or bad CRC values.
*
* In contrast with es58x_rx_cmd_ret_u32(), the network device is
* unknown.
*
* Return: zero on success, return errno when any error occurs.
*/
int es58x_rx_cmd_ret_u8(struct device *dev,
enum es58x_ret_type cmd_ret_type,
enum es58x_ret_u8 rx_cmd_ret_u8)
{
const char *ret_desc = es58x_cmd_ret_desc(cmd_ret_type);
switch (rx_cmd_ret_u8) {
case ES58X_RET_U8_OK:
dev_dbg_ratelimited(dev, "%s: OK\n", ret_desc);
return 0;
case ES58X_RET_U8_ERR_UNSPECIFIED_FAILURE:
dev_err(dev, "%s: unspecified failure\n", ret_desc);
return -EBADMSG;
case ES58X_RET_U8_ERR_NO_MEM:
dev_err(dev, "%s: device ran out of memory\n", ret_desc);
return -ENOMEM;
case ES58X_RET_U8_ERR_BAD_CRC:
dev_err(dev, "%s: CRC of previous command is incorrect\n",
ret_desc);
return -EIO;
default:
dev_err(dev, "%s: returned unknown value: 0x%02X\n",
ret_desc, rx_cmd_ret_u8);
return -EBADMSG;
}
}
/**
* es58x_rx_cmd_ret_u32() - Handle the command return code received
* from the ES58X device.
* @netdev: CAN network device.
* @cmd_ret_type: Type of the command which triggered the return code.
* @rx_cmd_ret_u32: error code as returned by the ES58X device.
*
* Handles the 32 bits command return code. The return value will
* eventually be used by es58x_handle_urb_cmd() function which will
* take proper actions in case of critical issues such and memory
* errors or bad CRC values.
*
* Return: zero on success, errno when any error occurs.
*/
int es58x_rx_cmd_ret_u32(struct net_device *netdev,
enum es58x_ret_type cmd_ret_type,
enum es58x_ret_u32 rx_cmd_ret_u32)
{
struct es58x_priv *priv = es58x_priv(netdev);
const struct es58x_operators *ops = priv->es58x_dev->ops;
const char *ret_desc = es58x_cmd_ret_desc(cmd_ret_type);
switch (rx_cmd_ret_u32) {
case ES58X_RET_U32_OK:
switch (cmd_ret_type) {
case ES58X_RET_TYPE_ENABLE_CHANNEL:
es58x_can_reset_echo_fifo(netdev);
priv->can.state = CAN_STATE_ERROR_ACTIVE;
netif_wake_queue(netdev);
netdev_info(netdev,
"%s: %s (Serial Number %s): CAN%d channel becomes ready\n",
ret_desc, priv->es58x_dev->udev->product,
priv->es58x_dev->udev->serial,
priv->channel_idx + 1);
break;
case ES58X_RET_TYPE_TX_MSG:
if (IS_ENABLED(CONFIG_VERBOSE_DEBUG) && net_ratelimit())
netdev_vdbg(netdev, "%s: OK\n", ret_desc);
break;
default:
netdev_dbg(netdev, "%s: OK\n", ret_desc);
break;
}
return 0;
case ES58X_RET_U32_ERR_UNSPECIFIED_FAILURE:
if (cmd_ret_type == ES58X_RET_TYPE_ENABLE_CHANNEL) {
int ret;
netdev_warn(netdev,
"%s: channel is already opened, closing and re-opening it to reflect new configuration\n",
ret_desc);
ret = ops->disable_channel(es58x_priv(netdev));
if (ret)
return ret;
return ops->enable_channel(es58x_priv(netdev));
}
if (cmd_ret_type == ES58X_RET_TYPE_DISABLE_CHANNEL) {
netdev_info(netdev,
"%s: channel is already closed\n", ret_desc);
return 0;
}
netdev_err(netdev,
"%s: unspecified failure\n", ret_desc);
return -EBADMSG;
case ES58X_RET_U32_ERR_NO_MEM:
netdev_err(netdev, "%s: device ran out of memory\n", ret_desc);
return -ENOMEM;
case ES58X_RET_U32_WARN_PARAM_ADJUSTED:
netdev_warn(netdev,
"%s: some incompatible parameters have been adjusted\n",
ret_desc);
return 0;
case ES58X_RET_U32_WARN_TX_MAYBE_REORDER:
netdev_warn(netdev,
"%s: TX messages might have been reordered\n",
ret_desc);
return 0;
case ES58X_RET_U32_ERR_TIMEDOUT:
netdev_err(netdev, "%s: command timed out\n", ret_desc);
return -ETIMEDOUT;
case ES58X_RET_U32_ERR_FIFO_FULL:
netdev_warn(netdev, "%s: fifo is full\n", ret_desc);
return 0;
case ES58X_RET_U32_ERR_BAD_CONFIG:
netdev_err(netdev, "%s: bad configuration\n", ret_desc);
return -EINVAL;
case ES58X_RET_U32_ERR_NO_RESOURCE:
netdev_err(netdev, "%s: no resource available\n", ret_desc);
return -EBUSY;
default:
netdev_err(netdev, "%s returned unknown value: 0x%08X\n",
ret_desc, rx_cmd_ret_u32);
return -EBADMSG;
}
}
/**
* es58x_increment_rx_errors() - Increment the network devices' error
* count.
* @es58x_dev: ES58X device.
*
* If an error occurs on the early stages on receiving an URB command,
* we might not be able to figure out on which network device the
* error occurred. In such case, we arbitrarily increment the error
* count of all the network devices attached to our ES58X device.
*/
static void es58x_increment_rx_errors(struct es58x_device *es58x_dev)
{
int i;
for (i = 0; i < es58x_dev->num_can_ch; i++)
if (es58x_dev->netdev[i])
es58x_dev->netdev[i]->stats.rx_errors++;
}
/**
* es58x_handle_urb_cmd() - Handle the URB command
* @es58x_dev: ES58X device.
* @urb_cmd: The URB command received from the ES58X device, might not
* be aligned.
*
* Sends the URB command to the device specific function. Manages the
* errors thrown back by those functions.
*/
static void es58x_handle_urb_cmd(struct es58x_device *es58x_dev,
const union es58x_urb_cmd *urb_cmd)
{
const struct es58x_operators *ops = es58x_dev->ops;
size_t cmd_len;
int i, ret;
ret = ops->handle_urb_cmd(es58x_dev, urb_cmd);
switch (ret) {
case 0: /* OK */
return;
case -ENODEV:
dev_err_ratelimited(es58x_dev->dev, "Device is not ready\n");
break;
case -EINVAL:
case -EMSGSIZE:
case -EBADRQC:
case -EBADMSG:
case -ECHRNG:
case -ETIMEDOUT:
cmd_len = es58x_get_urb_cmd_len(es58x_dev,
ops->get_msg_len(urb_cmd));
dev_err(es58x_dev->dev,
"ops->handle_urb_cmd() returned error %pe",
ERR_PTR(ret));
es58x_print_hex_dump(urb_cmd, cmd_len);
break;
case -EFAULT:
case -ENOMEM:
case -EIO:
default:
dev_crit(es58x_dev->dev,
"ops->handle_urb_cmd() returned error %pe, detaching all network devices\n",
ERR_PTR(ret));
for (i = 0; i < es58x_dev->num_can_ch; i++)
if (es58x_dev->netdev[i])
netif_device_detach(es58x_dev->netdev[i]);
if (es58x_dev->ops->reset_device)
es58x_dev->ops->reset_device(es58x_dev);
break;
}
/* Because the urb command could not fully be parsed,
* channel_id is not confirmed. Incrementing rx_errors count
* of all channels.
*/
es58x_increment_rx_errors(es58x_dev);
}
/**
* es58x_check_rx_urb() - Check the length and format of the URB command.
* @es58x_dev: ES58X device.
* @urb_cmd: The URB command received from the ES58X device, might not
* be aligned.
* @urb_actual_len: The actual length of the URB command.
*
* Check if the first message of the received urb is valid, that is to
* say that both the header and the length are coherent.
*
* Return:
* the length of the first message of the URB on success.
*
* -ENODATA if the URB command is incomplete (in which case, the URB
* command should be buffered and combined with the next URB to try to
* reconstitute the URB command).
*
* -EOVERFLOW if the length is bigger than the maximum expected one.
*
* -EBADRQC if the start of frame does not match the expected value.
*/
static signed int es58x_check_rx_urb(struct es58x_device *es58x_dev,
const union es58x_urb_cmd *urb_cmd,
u32 urb_actual_len)
{
const struct device *dev = es58x_dev->dev;
const struct es58x_parameters *param = es58x_dev->param;
u16 sof, msg_len;
signed int urb_cmd_len, ret;
if (urb_actual_len < param->urb_cmd_header_len) {
dev_vdbg(dev,
"%s: Received %d bytes [%*ph]: header incomplete\n",
__func__, urb_actual_len, urb_actual_len,
urb_cmd->raw_cmd);
return -ENODATA;
}
sof = get_unaligned_le16(&urb_cmd->sof);
if (sof != param->rx_start_of_frame) {
dev_err_ratelimited(es58x_dev->dev,
"%s: Expected sequence 0x%04X for start of frame but got 0x%04X.\n",
__func__, param->rx_start_of_frame, sof);
return -EBADRQC;
}
msg_len = es58x_dev->ops->get_msg_len(urb_cmd);
urb_cmd_len = es58x_get_urb_cmd_len(es58x_dev, msg_len);
if (urb_cmd_len > param->rx_urb_cmd_max_len) {
dev_err_ratelimited(es58x_dev->dev,
"%s: Biggest expected size for rx urb_cmd is %u but receive a command of size %d\n",
__func__,
param->rx_urb_cmd_max_len, urb_cmd_len);
return -EOVERFLOW;
} else if (urb_actual_len < urb_cmd_len) {
dev_vdbg(dev, "%s: Received %02d/%02d bytes\n",
__func__, urb_actual_len, urb_cmd_len);
return -ENODATA;
}
ret = es58x_check_crc(es58x_dev, urb_cmd, urb_cmd_len);
if (ret)
return ret;
return urb_cmd_len;
}
/**
* es58x_copy_to_cmd_buf() - Copy an array to the URB command buffer.
* @es58x_dev: ES58X device.
* @raw_cmd: the buffer we want to copy.
* @raw_cmd_len: length of @raw_cmd.
*
* Concatenates @raw_cmd_len bytes of @raw_cmd to the end of the URB
* command buffer.
*
* Return: zero on success, -EMSGSIZE if not enough space is available
* to do the copy.
*/
static int es58x_copy_to_cmd_buf(struct es58x_device *es58x_dev,
u8 *raw_cmd, int raw_cmd_len)
{
if (es58x_dev->rx_cmd_buf_len + raw_cmd_len >
es58x_dev->param->rx_urb_cmd_max_len)
return -EMSGSIZE;
memcpy(&es58x_dev->rx_cmd_buf.raw_cmd[es58x_dev->rx_cmd_buf_len],
raw_cmd, raw_cmd_len);
es58x_dev->rx_cmd_buf_len += raw_cmd_len;
return 0;
}
/**
* es58x_split_urb_try_recovery() - Try to recover bad URB sequences.
* @es58x_dev: ES58X device.
* @raw_cmd: pointer to the buffer we want to copy.
* @raw_cmd_len: length of @raw_cmd.
*
* Under some rare conditions, we might get incorrect URBs from the
* device. From our observations, one of the valid URB gets replaced
* by one from the past. The full root cause is not identified.
*
* This function looks for the next start of frame in the urb buffer
* in order to try to recover.
*
* Such behavior was not observed on the devices of the ES58X FD
* family and only seems to impact the ES581.4.
*
* Return: the number of bytes dropped on success, -EBADMSG if recovery failed.
*/
static int es58x_split_urb_try_recovery(struct es58x_device *es58x_dev,
u8 *raw_cmd, size_t raw_cmd_len)
{
union es58x_urb_cmd *urb_cmd;
signed int urb_cmd_len;
u16 sof;
int dropped_bytes = 0;
es58x_increment_rx_errors(es58x_dev);
while (raw_cmd_len > sizeof(sof)) {
urb_cmd = (union es58x_urb_cmd *)raw_cmd;
sof = get_unaligned_le16(&urb_cmd->sof);
if (sof == es58x_dev->param->rx_start_of_frame) {
urb_cmd_len = es58x_check_rx_urb(es58x_dev,
urb_cmd, raw_cmd_len);
if ((urb_cmd_len == -ENODATA) || urb_cmd_len > 0) {
dev_info_ratelimited(es58x_dev->dev,
"Recovery successful! Dropped %d bytes (urb_cmd_len: %d)\n",
dropped_bytes,
urb_cmd_len);
return dropped_bytes;
}
}
raw_cmd++;
raw_cmd_len--;
dropped_bytes++;
}
dev_warn_ratelimited(es58x_dev->dev, "%s: Recovery failed\n", __func__);
return -EBADMSG;
}
/**
* es58x_handle_incomplete_cmd() - Reconstitute an URB command from
* different URB pieces.
* @es58x_dev: ES58X device.
* @urb: last urb buffer received.
*
* The device might split the URB commands in an arbitrary amount of
* pieces. This function concatenates those in an URB buffer until a
* full URB command is reconstituted and consume it.
*
* Return:
* number of bytes consumed from @urb if successful.
*
* -ENODATA if the URB command is still incomplete.
*
* -EBADMSG if the URB command is incorrect.
*/
static signed int es58x_handle_incomplete_cmd(struct es58x_device *es58x_dev,
struct urb *urb)
{
size_t cpy_len;
signed int urb_cmd_len, tmp_cmd_buf_len, ret;
tmp_cmd_buf_len = es58x_dev->rx_cmd_buf_len;
cpy_len = min_t(int, es58x_dev->param->rx_urb_cmd_max_len -
es58x_dev->rx_cmd_buf_len, urb->actual_length);
ret = es58x_copy_to_cmd_buf(es58x_dev, urb->transfer_buffer, cpy_len);
if (ret < 0)
return ret;
urb_cmd_len = es58x_check_rx_urb(es58x_dev, &es58x_dev->rx_cmd_buf,
es58x_dev->rx_cmd_buf_len);
if (urb_cmd_len == -ENODATA) {
return -ENODATA;
} else if (urb_cmd_len < 0) {
dev_err_ratelimited(es58x_dev->dev,
"Could not reconstitute incomplete command from previous URB, dropping %d bytes\n",
tmp_cmd_buf_len + urb->actual_length);
dev_err_ratelimited(es58x_dev->dev,
"Error code: %pe, es58x_dev->rx_cmd_buf_len: %d, urb->actual_length: %u\n",
ERR_PTR(urb_cmd_len),
tmp_cmd_buf_len, urb->actual_length);
es58x_print_hex_dump(&es58x_dev->rx_cmd_buf, tmp_cmd_buf_len);
es58x_print_hex_dump(urb->transfer_buffer, urb->actual_length);
return urb->actual_length;
}
es58x_handle_urb_cmd(es58x_dev, &es58x_dev->rx_cmd_buf);
return urb_cmd_len - tmp_cmd_buf_len; /* consumed length */
}
/**
* es58x_split_urb() - Cut the received URB in individual URB commands.
* @es58x_dev: ES58X device.
* @urb: last urb buffer received.
*
* The device might send urb in bulk format (i.e. several URB commands
* concatenated together). This function will split all the commands
* contained in the urb.
*
* Return:
* number of bytes consumed from @urb if successful.
*
* -ENODATA if the URB command is incomplete.
*
* -EBADMSG if the URB command is incorrect.
*/
static signed int es58x_split_urb(struct es58x_device *es58x_dev,
struct urb *urb)
{
union es58x_urb_cmd *urb_cmd;
u8 *raw_cmd = urb->transfer_buffer;
s32 raw_cmd_len = urb->actual_length;
int ret;
if (es58x_dev->rx_cmd_buf_len != 0) {
ret = es58x_handle_incomplete_cmd(es58x_dev, urb);
if (ret != -ENODATA)
es58x_dev->rx_cmd_buf_len = 0;
if (ret < 0)
return ret;
raw_cmd += ret;
raw_cmd_len -= ret;
}
while (raw_cmd_len > 0) {
if (raw_cmd[0] == ES58X_HEARTBEAT) {
raw_cmd++;
raw_cmd_len--;
continue;
}
urb_cmd = (union es58x_urb_cmd *)raw_cmd;
ret = es58x_check_rx_urb(es58x_dev, urb_cmd, raw_cmd_len);
if (ret > 0) {
es58x_handle_urb_cmd(es58x_dev, urb_cmd);
} else if (ret == -ENODATA) {
es58x_copy_to_cmd_buf(es58x_dev, raw_cmd, raw_cmd_len);
return -ENODATA;
} else if (ret < 0) {
ret = es58x_split_urb_try_recovery(es58x_dev, raw_cmd,
raw_cmd_len);
if (ret < 0)
return ret;
}
raw_cmd += ret;
raw_cmd_len -= ret;
}
return 0;
}
/**
* es58x_read_bulk_callback() - Callback for reading data from device.
* @urb: last urb buffer received.
*
* This function gets eventually called each time an URB is received
* from the ES58X device.
*
* Checks urb status, calls read function and resubmits urb read
* operation.
*/
static void es58x_read_bulk_callback(struct urb *urb)
{
struct es58x_device *es58x_dev = urb->context;
const struct device *dev = es58x_dev->dev;
int i, ret;
switch (urb->status) {
case 0: /* success */
break;
case -EOVERFLOW:
dev_err_ratelimited(dev, "%s: error %pe\n",
__func__, ERR_PTR(urb->status));
es58x_print_hex_dump_debug(urb->transfer_buffer,
urb->transfer_buffer_length);
goto resubmit_urb;
case -EPROTO:
dev_warn_ratelimited(dev, "%s: error %pe. Device unplugged?\n",
__func__, ERR_PTR(urb->status));
goto free_urb;
case -ENOENT:
case -EPIPE:
dev_err_ratelimited(dev, "%s: error %pe\n",
__func__, ERR_PTR(urb->status));
goto free_urb;
case -ESHUTDOWN:
dev_dbg_ratelimited(dev, "%s: error %pe\n",
__func__, ERR_PTR(urb->status));
goto free_urb;
default:
dev_err_ratelimited(dev, "%s: error %pe\n",
__func__, ERR_PTR(urb->status));
goto resubmit_urb;
}
ret = es58x_split_urb(es58x_dev, urb);
if ((ret != -ENODATA) && ret < 0) {
dev_err(es58x_dev->dev, "es58x_split_urb() returned error %pe",
ERR_PTR(ret));
es58x_print_hex_dump_debug(urb->transfer_buffer,
urb->actual_length);
/* Because the urb command could not be parsed,
* channel_id is not confirmed. Incrementing rx_errors
* count of all channels.
*/
es58x_increment_rx_errors(es58x_dev);
}
resubmit_urb:
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret == -ENODEV) {
for (i = 0; i < es58x_dev->num_can_ch; i++)
if (es58x_dev->netdev[i])
netif_device_detach(es58x_dev->netdev[i]);
} else if (ret)
dev_err_ratelimited(dev,
"Failed resubmitting read bulk urb: %pe\n",
ERR_PTR(ret));
return;
free_urb:
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
urb->transfer_buffer, urb->transfer_dma);
}
/**
* es58x_write_bulk_callback() - Callback after writing data to the device.
* @urb: urb buffer which was previously submitted.
*
* This function gets eventually called each time an URB was sent to
* the ES58X device.
*
* Puts the @urb back to the urbs idle anchor and tries to restart the
* network queue.
*/
static void es58x_write_bulk_callback(struct urb *urb)
{
struct net_device *netdev = urb->context;
struct es58x_device *es58x_dev = es58x_priv(netdev)->es58x_dev;
switch (urb->status) {
case 0: /* success */
break;
case -EOVERFLOW:
if (net_ratelimit())
netdev_err(netdev, "%s: error %pe\n",
__func__, ERR_PTR(urb->status));
es58x_print_hex_dump(urb->transfer_buffer,
urb->transfer_buffer_length);
break;
case -ENOENT:
if (net_ratelimit())
netdev_dbg(netdev, "%s: error %pe\n",
__func__, ERR_PTR(urb->status));
usb_free_coherent(urb->dev,
es58x_dev->param->tx_urb_cmd_max_len,
urb->transfer_buffer, urb->transfer_dma);
return;
default:
if (net_ratelimit())
netdev_info(netdev, "%s: error %pe\n",
__func__, ERR_PTR(urb->status));
break;
}
usb_anchor_urb(urb, &es58x_dev->tx_urbs_idle);
atomic_inc(&es58x_dev->tx_urbs_idle_cnt);
}
/**
* es58x_alloc_urb() - Allocate memory for an URB and its transfer
* buffer.
* @es58x_dev: ES58X device.
* @urb: URB to be allocated.
* @buf: used to return DMA address of buffer.
* @buf_len: requested buffer size.
* @mem_flags: affect whether allocation may block.
*
* Allocates an URB and its @transfer_buffer and set its @transfer_dma
* address.
*
* This function is used at start-up to allocate all RX URBs at once
* and during run time for TX URBs.
*
* Return: zero on success, -ENOMEM if no memory is available.
*/
static int es58x_alloc_urb(struct es58x_device *es58x_dev, struct urb **urb,
u8 **buf, size_t buf_len, gfp_t mem_flags)
{
*urb = usb_alloc_urb(0, mem_flags);
if (!*urb) {
dev_err(es58x_dev->dev, "No memory left for URBs\n");
return -ENOMEM;
}
*buf = usb_alloc_coherent(es58x_dev->udev, buf_len,
mem_flags, &(*urb)->transfer_dma);
if (!*buf) {
dev_err(es58x_dev->dev, "No memory left for USB buffer\n");
usb_free_urb(*urb);
return -ENOMEM;
}
(*urb)->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
return 0;
}
/**
* es58x_get_tx_urb() - Get an URB for transmission.
* @es58x_dev: ES58X device.
*
* Gets an URB from the idle urbs anchor or allocate a new one if the
* anchor is empty.
*
* If there are more than ES58X_TX_URBS_MAX in the idle anchor, do
* some garbage collection. The garbage collection is done here
* instead of within es58x_write_bulk_callback() because
* usb_free_coherent() should not be used in IRQ context:
* c.f. WARN_ON(irqs_disabled()) in dma_free_attrs().
*
* Return: a pointer to an URB on success, NULL if no memory is
* available.
*/
static struct urb *es58x_get_tx_urb(struct es58x_device *es58x_dev)
{
atomic_t *idle_cnt = &es58x_dev->tx_urbs_idle_cnt;
struct urb *urb = usb_get_from_anchor(&es58x_dev->tx_urbs_idle);
if (!urb) {
size_t tx_buf_len;
u8 *buf;
tx_buf_len = es58x_dev->param->tx_urb_cmd_max_len;
if (es58x_alloc_urb(es58x_dev, &urb, &buf, tx_buf_len,
GFP_ATOMIC))
return NULL;
usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->tx_pipe,
buf, tx_buf_len, es58x_write_bulk_callback,
NULL);
return urb;
}
while (atomic_dec_return(idle_cnt) > ES58X_TX_URBS_MAX) {
/* Garbage collector */
struct urb *tmp = usb_get_from_anchor(&es58x_dev->tx_urbs_idle);
if (!tmp)
break;
usb_free_coherent(tmp->dev,
es58x_dev->param->tx_urb_cmd_max_len,
tmp->transfer_buffer, tmp->transfer_dma);
usb_free_urb(tmp);
}
return urb;
}
/**
* es58x_submit_urb() - Send data to the device.
* @es58x_dev: ES58X device.
* @urb: URB to be sent.
* @netdev: CAN network device.
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_submit_urb(struct es58x_device *es58x_dev, struct urb *urb,
struct net_device *netdev)
{
int ret;
es58x_set_crc(urb->transfer_buffer, urb->transfer_buffer_length);
urb->context = netdev;
usb_anchor_urb(urb, &es58x_dev->tx_urbs_busy);
ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret) {
netdev_err(netdev, "%s: USB send urb failure: %pe\n",
__func__, ERR_PTR(ret));
usb_unanchor_urb(urb);
usb_free_coherent(urb->dev,
es58x_dev->param->tx_urb_cmd_max_len,
urb->transfer_buffer, urb->transfer_dma);
}
usb_free_urb(urb);
return ret;
}
/**
* es58x_send_msg() - Prepare an URB and submit it.
* @es58x_dev: ES58X device.
* @cmd_type: Command type.
* @cmd_id: Command ID.
* @msg: ES58X message to be sent.
* @msg_len: Length of @msg.
* @channel_idx: Index of the network device.
*
* Creates an URB command from a given message, sets the header and the
* CRC and then submits it.
*
* Return: zero on success, errno when any error occurs.
*/
int es58x_send_msg(struct es58x_device *es58x_dev, u8 cmd_type, u8 cmd_id,
const void *msg, u16 msg_len, int channel_idx)
{
struct net_device *netdev;
union es58x_urb_cmd *urb_cmd;
struct urb *urb;
int urb_cmd_len;
if (channel_idx == ES58X_CHANNEL_IDX_NA)
netdev = es58x_dev->netdev[0]; /* Default to first channel */
else
netdev = es58x_dev->netdev[channel_idx];
urb_cmd_len = es58x_get_urb_cmd_len(es58x_dev, msg_len);
if (urb_cmd_len > es58x_dev->param->tx_urb_cmd_max_len)
return -EOVERFLOW;
urb = es58x_get_tx_urb(es58x_dev);
if (!urb)
return -ENOMEM;
urb_cmd = urb->transfer_buffer;
es58x_dev->ops->fill_urb_header(urb_cmd, cmd_type, cmd_id,
channel_idx, msg_len);
memcpy(&urb_cmd->raw_cmd[es58x_dev->param->urb_cmd_header_len],
msg, msg_len);
urb->transfer_buffer_length = urb_cmd_len;
return es58x_submit_urb(es58x_dev, urb, netdev);
}
/**
* es58x_alloc_rx_urbs() - Allocate RX URBs.
* @es58x_dev: ES58X device.
*
* Allocate URBs for reception and anchor them.
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_alloc_rx_urbs(struct es58x_device *es58x_dev)
{
const struct device *dev = es58x_dev->dev;
const struct es58x_parameters *param = es58x_dev->param;
u16 rx_buf_len = usb_maxpacket(es58x_dev->udev, es58x_dev->rx_pipe);
struct urb *urb;
u8 *buf;
int i;
int ret = -EINVAL;
for (i = 0; i < param->rx_urb_max; i++) {
ret = es58x_alloc_urb(es58x_dev, &urb, &buf, rx_buf_len,
GFP_KERNEL);
if (ret)
break;
usb_fill_bulk_urb(urb, es58x_dev->udev, es58x_dev->rx_pipe,
buf, rx_buf_len, es58x_read_bulk_callback,
es58x_dev);
usb_anchor_urb(urb, &es58x_dev->rx_urbs);
ret = usb_submit_urb(urb, GFP_KERNEL);
if (ret) {
usb_unanchor_urb(urb);
usb_free_coherent(es58x_dev->udev, rx_buf_len,
buf, urb->transfer_dma);
usb_free_urb(urb);
break;
}
usb_free_urb(urb);
}
if (i == 0) {
dev_err(dev, "%s: Could not setup any rx URBs\n", __func__);
return ret;
}
dev_dbg(dev, "%s: Allocated %d rx URBs each of size %u\n",
__func__, i, rx_buf_len);
return ret;
}
/**
* es58x_free_urbs() - Free all the TX and RX URBs.
* @es58x_dev: ES58X device.
*/
static void es58x_free_urbs(struct es58x_device *es58x_dev)
{
struct urb *urb;
if (!usb_wait_anchor_empty_timeout(&es58x_dev->tx_urbs_busy, 1000)) {
dev_err(es58x_dev->dev, "%s: Timeout, some TX urbs still remain\n",
__func__);
usb_kill_anchored_urbs(&es58x_dev->tx_urbs_busy);
}
while ((urb = usb_get_from_anchor(&es58x_dev->tx_urbs_idle)) != NULL) {
usb_free_coherent(urb->dev, es58x_dev->param->tx_urb_cmd_max_len,
urb->transfer_buffer, urb->transfer_dma);
usb_free_urb(urb);
atomic_dec(&es58x_dev->tx_urbs_idle_cnt);
}
if (atomic_read(&es58x_dev->tx_urbs_idle_cnt))
dev_err(es58x_dev->dev,
"All idle urbs were freed but tx_urb_idle_cnt is %d\n",
atomic_read(&es58x_dev->tx_urbs_idle_cnt));
usb_kill_anchored_urbs(&es58x_dev->rx_urbs);
}
/**
* es58x_open() - Enable the network device.
* @netdev: CAN network device.
*
* Called when the network transitions to the up state. Allocate the
* URB resources if needed and open the channel.
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_open(struct net_device *netdev)
{
struct es58x_device *es58x_dev = es58x_priv(netdev)->es58x_dev;
int ret;
if (!es58x_dev->opened_channel_cnt) {
ret = es58x_alloc_rx_urbs(es58x_dev);
if (ret)
return ret;
ret = es58x_set_realtime_diff_ns(es58x_dev);
if (ret)
goto free_urbs;
}
ret = open_candev(netdev);
if (ret)
goto free_urbs;
ret = es58x_dev->ops->enable_channel(es58x_priv(netdev));
if (ret)
goto free_urbs;
es58x_dev->opened_channel_cnt++;
netif_start_queue(netdev);
return ret;
free_urbs:
if (!es58x_dev->opened_channel_cnt)
es58x_free_urbs(es58x_dev);
netdev_err(netdev, "%s: Could not open the network device: %pe\n",
__func__, ERR_PTR(ret));
return ret;
}
/**
* es58x_stop() - Disable the network device.
* @netdev: CAN network device.
*
* Called when the network transitions to the down state. If all the
* channels of the device are closed, free the URB resources which are
* not needed anymore.
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_stop(struct net_device *netdev)
{
struct es58x_priv *priv = es58x_priv(netdev);
struct es58x_device *es58x_dev = priv->es58x_dev;
int ret;
netif_stop_queue(netdev);
ret = es58x_dev->ops->disable_channel(priv);
if (ret)
return ret;
priv->can.state = CAN_STATE_STOPPED;
es58x_can_reset_echo_fifo(netdev);
close_candev(netdev);
es58x_flush_pending_tx_msg(netdev);
es58x_dev->opened_channel_cnt--;
if (!es58x_dev->opened_channel_cnt)
es58x_free_urbs(es58x_dev);
return 0;
}
/**
* es58x_xmit_commit() - Send the bulk urb.
* @netdev: CAN network device.
*
* Do the bulk send. This function should be called only once by bulk
* transmission.
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_xmit_commit(struct net_device *netdev)
{
struct es58x_priv *priv = es58x_priv(netdev);
int ret;
if (!es58x_is_can_state_active(netdev))
return -ENETDOWN;
if (es58x_is_echo_skb_threshold_reached(priv))
netif_stop_queue(netdev);
ret = es58x_submit_urb(priv->es58x_dev, priv->tx_urb, netdev);
if (ret == 0)
priv->tx_urb = NULL;
return ret;
}
/**
* es58x_xmit_more() - Can we put more packets?
* @priv: ES58X private parameters related to the network device.
*
* Return: true if we can put more, false if it is time to send.
*/
static bool es58x_xmit_more(struct es58x_priv *priv)
{
unsigned int free_slots =
priv->can.echo_skb_max - (priv->tx_head - priv->tx_tail);
return netdev_xmit_more() && free_slots > 0 &&
priv->tx_can_msg_cnt < priv->es58x_dev->param->tx_bulk_max;
}
/**
* es58x_start_xmit() - Transmit an skb.
* @skb: socket buffer of a CAN message.
* @netdev: CAN network device.
*
* Called when a packet needs to be transmitted.
*
* This function relies on Byte Queue Limits (BQL). The main benefit
* is to increase the throughput by allowing bulk transfers
* (c.f. xmit_more flag).
*
* Queues up to tx_bulk_max messages in &tx_urb buffer and does
* a bulk send of all messages in one single URB.
*
* Return: NETDEV_TX_OK regardless of if we could transmit the @skb or
* had to drop it.
*/
static netdev_tx_t es58x_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct es58x_priv *priv = es58x_priv(netdev);
struct es58x_device *es58x_dev = priv->es58x_dev;
unsigned int frame_len;
int ret;
if (can_dropped_invalid_skb(netdev, skb)) {
if (priv->tx_urb)
goto xmit_commit;
return NETDEV_TX_OK;
}
if (priv->tx_urb && priv->tx_can_msg_is_fd != can_is_canfd_skb(skb)) {
/* Can not do bulk send with mixed CAN and CAN FD frames. */
ret = es58x_xmit_commit(netdev);
if (ret)
goto drop_skb;
}
if (!priv->tx_urb) {
priv->tx_urb = es58x_get_tx_urb(es58x_dev);
if (!priv->tx_urb) {
ret = -ENOMEM;
goto drop_skb;
}
priv->tx_can_msg_cnt = 0;
priv->tx_can_msg_is_fd = can_is_canfd_skb(skb);
}
ret = es58x_dev->ops->tx_can_msg(priv, skb);
if (ret)
goto drop_skb;
frame_len = can_skb_get_frame_len(skb);
ret = can_put_echo_skb(skb, netdev,
priv->tx_head & es58x_dev->param->fifo_mask,
frame_len);
if (ret)
goto xmit_failure;
netdev_sent_queue(netdev, frame_len);
priv->tx_head++;
priv->tx_can_msg_cnt++;
xmit_commit:
if (!es58x_xmit_more(priv)) {
ret = es58x_xmit_commit(netdev);
if (ret)
goto xmit_failure;
}
return NETDEV_TX_OK;
drop_skb:
dev_kfree_skb(skb);
netdev->stats.tx_dropped++;
xmit_failure:
netdev_warn(netdev, "%s: send message failure: %pe\n",
__func__, ERR_PTR(ret));
netdev->stats.tx_errors++;
es58x_flush_pending_tx_msg(netdev);
return NETDEV_TX_OK;
}
static const struct net_device_ops es58x_netdev_ops = {
.ndo_open = es58x_open,
.ndo_stop = es58x_stop,
.ndo_start_xmit = es58x_start_xmit,
.ndo_eth_ioctl = can_eth_ioctl_hwts,
};
static const struct ethtool_ops es58x_ethtool_ops = {
.get_ts_info = can_ethtool_op_get_ts_info_hwts,
};
/**
* es58x_set_mode() - Change network device mode.
* @netdev: CAN network device.
* @mode: either %CAN_MODE_START, %CAN_MODE_STOP or %CAN_MODE_SLEEP
*
* Currently, this function is only used to stop and restart the
* channel during a bus off event (c.f. es58x_rx_err_msg() and
* drivers/net/can/dev.c:can_restart() which are the two only
* callers).
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_set_mode(struct net_device *netdev, enum can_mode mode)
{
struct es58x_priv *priv = es58x_priv(netdev);
switch (mode) {
case CAN_MODE_START:
switch (priv->can.state) {
case CAN_STATE_BUS_OFF:
return priv->es58x_dev->ops->enable_channel(priv);
case CAN_STATE_STOPPED:
return es58x_open(netdev);
case CAN_STATE_ERROR_ACTIVE:
case CAN_STATE_ERROR_WARNING:
case CAN_STATE_ERROR_PASSIVE:
default:
return 0;
}
case CAN_MODE_STOP:
switch (priv->can.state) {
case CAN_STATE_STOPPED:
return 0;
case CAN_STATE_ERROR_ACTIVE:
case CAN_STATE_ERROR_WARNING:
case CAN_STATE_ERROR_PASSIVE:
case CAN_STATE_BUS_OFF:
default:
return priv->es58x_dev->ops->disable_channel(priv);
}
case CAN_MODE_SLEEP:
default:
return -EOPNOTSUPP;
}
}
/**
* es58x_init_priv() - Initialize private parameters.
* @es58x_dev: ES58X device.
* @priv: ES58X private parameters related to the network device.
* @channel_idx: Index of the network device.
*/
static void es58x_init_priv(struct es58x_device *es58x_dev,
struct es58x_priv *priv, int channel_idx)
{
const struct es58x_parameters *param = es58x_dev->param;
struct can_priv *can = &priv->can;
priv->es58x_dev = es58x_dev;
priv->channel_idx = channel_idx;
priv->tx_urb = NULL;
priv->tx_can_msg_cnt = 0;
can->bittiming_const = param->bittiming_const;
if (param->ctrlmode_supported & CAN_CTRLMODE_FD) {
can->data_bittiming_const = param->data_bittiming_const;
can->tdc_const = param->tdc_const;
}
can->bitrate_max = param->bitrate_max;
can->clock = param->clock;
can->state = CAN_STATE_STOPPED;
can->ctrlmode_supported = param->ctrlmode_supported;
can->do_set_mode = es58x_set_mode;
}
/**
* es58x_init_netdev() - Initialize the network device.
* @es58x_dev: ES58X device.
* @channel_idx: Index of the network device.
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_init_netdev(struct es58x_device *es58x_dev, int channel_idx)
{
struct net_device *netdev;
struct device *dev = es58x_dev->dev;
int ret;
netdev = alloc_candev(sizeof(struct es58x_priv),
es58x_dev->param->fifo_mask + 1);
if (!netdev) {
dev_err(dev, "Could not allocate candev\n");
return -ENOMEM;
}
SET_NETDEV_DEV(netdev, dev);
es58x_dev->netdev[channel_idx] = netdev;
es58x_init_priv(es58x_dev, es58x_priv(netdev), channel_idx);
netdev->netdev_ops = &es58x_netdev_ops;
netdev->ethtool_ops = &es58x_ethtool_ops;
netdev->flags |= IFF_ECHO; /* We support local echo */
netdev->dev_port = channel_idx;
ret = register_candev(netdev);
if (ret)
return ret;
netdev_queue_set_dql_min_limit(netdev_get_tx_queue(netdev, 0),
es58x_dev->param->dql_min_limit);
return ret;
}
/**
* es58x_free_netdevs() - Release all network resources of the device.
* @es58x_dev: ES58X device.
*/
static void es58x_free_netdevs(struct es58x_device *es58x_dev)
{
int i;
for (i = 0; i < es58x_dev->num_can_ch; i++) {
struct net_device *netdev = es58x_dev->netdev[i];
if (!netdev)
continue;
unregister_candev(netdev);
es58x_dev->netdev[i] = NULL;
free_candev(netdev);
}
}
/**
* es58x_get_product_info() - Get the product information and print them.
* @es58x_dev: ES58X device.
*
* Do a synchronous call to get the product information.
*
* Return: zero on success, errno when any error occurs.
*/
static int es58x_get_product_info(struct es58x_device *es58x_dev)
{
struct usb_device *udev = es58x_dev->udev;
const int es58x_prod_info_idx = 6;
/* Empirical tests show a prod_info length of maximum 83,
* below should be more than enough.
*/
const size_t prod_info_len = 127;
char *prod_info;
int ret;
prod_info = kmalloc(prod_info_len, GFP_KERNEL);
if (!prod_info)
return -ENOMEM;
ret = usb_string(udev, es58x_prod_info_idx, prod_info, prod_info_len);
if (ret < 0) {
dev_err(es58x_dev->dev,
"%s: Could not read the product info: %pe\n",
__func__, ERR_PTR(ret));
goto out_free;
}
if (ret >= prod_info_len - 1) {
dev_warn(es58x_dev->dev,
"%s: Buffer is too small, result might be truncated\n",
__func__);
}
dev_info(es58x_dev->dev, "Product info: %s\n", prod_info);
out_free:
kfree(prod_info);
return ret < 0 ? ret : 0;
}
/**
* es58x_init_es58x_dev() - Initialize the ES58X device.
* @intf: USB interface.
* @driver_info: Quirks of the device.
*
* Return: pointer to an ES58X device on success, error pointer when
* any error occurs.
*/
static struct es58x_device *es58x_init_es58x_dev(struct usb_interface *intf,
kernel_ulong_t driver_info)
{
struct device *dev = &intf->dev;
struct es58x_device *es58x_dev;
const struct es58x_parameters *param;
const struct es58x_operators *ops;
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_endpoint_descriptor *ep_in, *ep_out;
int ret;
dev_info(dev, "Starting %s %s (Serial Number %s)\n",
udev->manufacturer, udev->product, udev->serial);
ret = usb_find_common_endpoints(intf->cur_altsetting, &ep_in, &ep_out,
NULL, NULL);
if (ret)
return ERR_PTR(ret);
if (driver_info & ES58X_FD_FAMILY) {
param = &es58x_fd_param;
ops = &es58x_fd_ops;
} else {
param = &es581_4_param;
ops = &es581_4_ops;
}
es58x_dev = devm_kzalloc(dev, es58x_sizeof_es58x_device(param),
GFP_KERNEL);
if (!es58x_dev)
return ERR_PTR(-ENOMEM);
es58x_dev->param = param;
es58x_dev->ops = ops;
es58x_dev->dev = dev;
es58x_dev->udev = udev;
if (driver_info & ES58X_DUAL_CHANNEL)
es58x_dev->num_can_ch = 2;
else
es58x_dev->num_can_ch = 1;
init_usb_anchor(&es58x_dev->rx_urbs);
init_usb_anchor(&es58x_dev->tx_urbs_idle);
init_usb_anchor(&es58x_dev->tx_urbs_busy);
atomic_set(&es58x_dev->tx_urbs_idle_cnt, 0);
usb_set_intfdata(intf, es58x_dev);
es58x_dev->rx_pipe = usb_rcvbulkpipe(es58x_dev->udev,
ep_in->bEndpointAddress);
es58x_dev->tx_pipe = usb_sndbulkpipe(es58x_dev->udev,
ep_out->bEndpointAddress);
return es58x_dev;
}
/**
* es58x_probe() - Initialize the USB device.
* @intf: USB interface.
* @id: USB device ID.
*
* Return: zero on success, -ENODEV if the interface is not supported
* or errno when any other error occurs.
*/
static int es58x_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct es58x_device *es58x_dev;
int ch_idx, ret;
es58x_dev = es58x_init_es58x_dev(intf, id->driver_info);
if (IS_ERR(es58x_dev))
return PTR_ERR(es58x_dev);
ret = es58x_get_product_info(es58x_dev);
if (ret)
return ret;
for (ch_idx = 0; ch_idx < es58x_dev->num_can_ch; ch_idx++) {
ret = es58x_init_netdev(es58x_dev, ch_idx);
if (ret) {
es58x_free_netdevs(es58x_dev);
return ret;
}
}
return ret;
}
/**
* es58x_disconnect() - Disconnect the USB device.
* @intf: USB interface
*
* Called by the usb core when driver is unloaded or device is
* removed.
*/
static void es58x_disconnect(struct usb_interface *intf)
{
struct es58x_device *es58x_dev = usb_get_intfdata(intf);
dev_info(&intf->dev, "Disconnecting %s %s\n",
es58x_dev->udev->manufacturer, es58x_dev->udev->product);
es58x_free_netdevs(es58x_dev);
es58x_free_urbs(es58x_dev);
usb_set_intfdata(intf, NULL);
}
static struct usb_driver es58x_driver = {
.name = KBUILD_MODNAME,
.probe = es58x_probe,
.disconnect = es58x_disconnect,
.id_table = es58x_id_table
};
module_usb_driver(es58x_driver);