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|
/*
* CAN driver for PEAK System USB adapters
* Derived from the PCAN project file driver/src/pcan_usb_core.c
*
* Copyright (C) 2003-2010 PEAK System-Technik GmbH
* Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
*
* Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
*
* 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.
*/
#include <linux/init.h>
#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>
#include "pcan_usb_core.h"
MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
MODULE_DESCRIPTION("CAN driver for PEAK-System USB adapters");
MODULE_LICENSE("GPL v2");
/* Table of devices that work with this driver */
static struct usb_device_id peak_usb_table[] = {
{USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USB_PRODUCT_ID)},
{USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPRO_PRODUCT_ID)},
{} /* Terminating entry */
};
MODULE_DEVICE_TABLE(usb, peak_usb_table);
/* List of supported PCAN-USB adapters (NULL terminated list) */
static struct peak_usb_adapter *peak_usb_adapters_list[] = {
&pcan_usb,
&pcan_usb_pro,
};
/*
* dump memory
*/
#define DUMP_WIDTH 16
void pcan_dump_mem(char *prompt, void *p, int l)
{
pr_info("%s dumping %s (%d bytes):\n",
PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l);
print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE,
DUMP_WIDTH, 1, p, l, false);
}
/*
* initialize a time_ref object with usb adapter own settings
*/
void peak_usb_init_time_ref(struct peak_time_ref *time_ref,
struct peak_usb_adapter *adapter)
{
if (time_ref) {
memset(time_ref, 0, sizeof(struct peak_time_ref));
time_ref->adapter = adapter;
}
}
static void peak_usb_add_us(struct timeval *tv, u32 delta_us)
{
/* number of s. to add to final time */
u32 delta_s = delta_us / 1000000;
delta_us -= delta_s * 1000000;
tv->tv_usec += delta_us;
if (tv->tv_usec >= 1000000) {
tv->tv_usec -= 1000000;
delta_s++;
}
tv->tv_sec += delta_s;
}
/*
* sometimes, another now may be more recent than current one...
*/
void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
{
time_ref->ts_dev_2 = ts_now;
/* should wait at least two passes before computing */
if (time_ref->tv_host.tv_sec > 0) {
u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1;
if (time_ref->ts_dev_2 < time_ref->ts_dev_1)
delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1;
time_ref->ts_total += delta_ts;
}
}
/*
* register device timestamp as now
*/
void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
{
if (time_ref->tv_host_0.tv_sec == 0) {
/* use monotonic clock to correctly compute further deltas */
time_ref->tv_host_0 = ktime_to_timeval(ktime_get());
time_ref->tv_host.tv_sec = 0;
} else {
/*
* delta_us should not be >= 2^32 => delta_s should be < 4294
* handle 32-bits wrapping here: if count of s. reaches 4200,
* reset counters and change time base
*/
if (time_ref->tv_host.tv_sec != 0) {
u32 delta_s = time_ref->tv_host.tv_sec
- time_ref->tv_host_0.tv_sec;
if (delta_s > 4200) {
time_ref->tv_host_0 = time_ref->tv_host;
time_ref->ts_total = 0;
}
}
time_ref->tv_host = ktime_to_timeval(ktime_get());
time_ref->tick_count++;
}
time_ref->ts_dev_1 = time_ref->ts_dev_2;
peak_usb_update_ts_now(time_ref, ts_now);
}
/*
* compute timeval according to current ts and time_ref data
*/
void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts,
struct timeval *tv)
{
/* protect from getting timeval before setting now */
if (time_ref->tv_host.tv_sec > 0) {
u64 delta_us;
delta_us = ts - time_ref->ts_dev_2;
if (ts < time_ref->ts_dev_2)
delta_us &= (1 << time_ref->adapter->ts_used_bits) - 1;
delta_us += time_ref->ts_total;
delta_us *= time_ref->adapter->us_per_ts_scale;
delta_us >>= time_ref->adapter->us_per_ts_shift;
*tv = time_ref->tv_host_0;
peak_usb_add_us(tv, (u32)delta_us);
} else {
*tv = ktime_to_timeval(ktime_get());
}
}
/*
* callback for bulk Rx urb
*/
static void peak_usb_read_bulk_callback(struct urb *urb)
{
struct peak_usb_device *dev = urb->context;
struct net_device *netdev;
int err;
netdev = dev->netdev;
if (!netif_device_present(netdev))
return;
/* check reception status */
switch (urb->status) {
case 0:
/* success */
break;
case -EILSEQ:
case -ENOENT:
case -ECONNRESET:
case -ESHUTDOWN:
return;
default:
if (net_ratelimit())
netdev_err(netdev,
"Rx urb aborted (%d)\n", urb->status);
goto resubmit_urb;
}
/* protect from any incoming empty msgs */
if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) {
/* handle these kinds of msgs only if _start callback called */
if (dev->state & PCAN_USB_STATE_STARTED) {
err = dev->adapter->dev_decode_buf(dev, urb);
if (err)
pcan_dump_mem("received usb message",
urb->transfer_buffer,
urb->transfer_buffer_length);
}
}
resubmit_urb:
usb_fill_bulk_urb(urb, dev->udev,
usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
urb->transfer_buffer, dev->adapter->rx_buffer_size,
peak_usb_read_bulk_callback, dev);
usb_anchor_urb(urb, &dev->rx_submitted);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (!err)
return;
usb_unanchor_urb(urb);
if (err == -ENODEV)
netif_device_detach(netdev);
else
netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
err);
}
/*
* callback for bulk Tx urb
*/
static void peak_usb_write_bulk_callback(struct urb *urb)
{
struct peak_tx_urb_context *context = urb->context;
struct peak_usb_device *dev;
struct net_device *netdev;
BUG_ON(!context);
dev = context->dev;
netdev = dev->netdev;
atomic_dec(&dev->active_tx_urbs);
if (!netif_device_present(netdev))
return;
/* check tx status */
switch (urb->status) {
case 0:
/* transmission complete */
netdev->stats.tx_packets++;
netdev->stats.tx_bytes += context->dlc;
/* prevent tx timeout */
netdev->trans_start = jiffies;
break;
default:
if (net_ratelimit())
netdev_err(netdev, "Tx urb aborted (%d)\n",
urb->status);
case -EPROTO:
case -ENOENT:
case -ECONNRESET:
case -ESHUTDOWN:
break;
}
/* should always release echo skb and corresponding context */
can_get_echo_skb(netdev, context->echo_index);
context->echo_index = PCAN_USB_MAX_TX_URBS;
/* do wakeup tx queue in case of success only */
if (!urb->status)
netif_wake_queue(netdev);
}
/*
* called by netdev to send one skb on the CAN interface.
*/
static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb,
struct net_device *netdev)
{
struct peak_usb_device *dev = netdev_priv(netdev);
struct peak_tx_urb_context *context = NULL;
struct net_device_stats *stats = &netdev->stats;
struct can_frame *cf = (struct can_frame *)skb->data;
struct urb *urb;
u8 *obuf;
int i, err;
size_t size = dev->adapter->tx_buffer_size;
if (can_dropped_invalid_skb(netdev, skb))
return NETDEV_TX_OK;
for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) {
context = dev->tx_contexts + i;
break;
}
if (!context) {
/* should not occur except during restart */
return NETDEV_TX_BUSY;
}
urb = context->urb;
obuf = urb->transfer_buffer;
err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size);
if (err) {
if (net_ratelimit())
netdev_err(netdev, "packet dropped\n");
dev_kfree_skb(skb);
stats->tx_dropped++;
return NETDEV_TX_OK;
}
context->echo_index = i;
context->dlc = cf->can_dlc;
usb_anchor_urb(urb, &dev->tx_submitted);
can_put_echo_skb(skb, netdev, context->echo_index);
atomic_inc(&dev->active_tx_urbs);
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err) {
can_free_echo_skb(netdev, context->echo_index);
usb_unanchor_urb(urb);
/* this context is not used in fact */
context->echo_index = PCAN_USB_MAX_TX_URBS;
atomic_dec(&dev->active_tx_urbs);
switch (err) {
case -ENODEV:
netif_device_detach(netdev);
break;
default:
netdev_warn(netdev, "tx urb submitting failed err=%d\n",
err);
case -ENOENT:
/* cable unplugged */
stats->tx_dropped++;
}
} else {
netdev->trans_start = jiffies;
/* slow down tx path */
if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS)
netif_stop_queue(netdev);
}
return NETDEV_TX_OK;
}
/*
* start the CAN interface.
* Rx and Tx urbs are allocated here. Rx urbs are submitted here.
*/
static int peak_usb_start(struct peak_usb_device *dev)
{
struct net_device *netdev = dev->netdev;
int err, i;
for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) {
struct urb *urb;
u8 *buf;
/* create a URB, and a buffer for it, to receive usb messages */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
netdev_err(netdev, "No memory left for URBs\n");
err = -ENOMEM;
break;
}
buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL);
if (!buf) {
usb_free_urb(urb);
err = -ENOMEM;
break;
}
usb_fill_bulk_urb(urb, dev->udev,
usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
buf, dev->adapter->rx_buffer_size,
peak_usb_read_bulk_callback, dev);
/* ask last usb_free_urb() to also kfree() transfer_buffer */
urb->transfer_flags |= URB_FREE_BUFFER;
usb_anchor_urb(urb, &dev->rx_submitted);
err = usb_submit_urb(urb, GFP_KERNEL);
if (err) {
if (err == -ENODEV)
netif_device_detach(dev->netdev);
usb_unanchor_urb(urb);
kfree(buf);
usb_free_urb(urb);
break;
}
/* drop reference, USB core will take care of freeing it */
usb_free_urb(urb);
}
/* did we submit any URBs? Warn if we was not able to submit all urbs */
if (i < PCAN_USB_MAX_RX_URBS) {
if (i == 0) {
netdev_err(netdev, "couldn't setup any rx URB\n");
return err;
}
netdev_warn(netdev, "rx performance may be slow\n");
}
/* pre-alloc tx buffers and corresponding urbs */
for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
struct peak_tx_urb_context *context;
struct urb *urb;
u8 *buf;
/* create a URB and a buffer for it, to transmit usb messages */
urb = usb_alloc_urb(0, GFP_KERNEL);
if (!urb) {
netdev_err(netdev, "No memory left for URBs\n");
err = -ENOMEM;
break;
}
buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL);
if (!buf) {
usb_free_urb(urb);
err = -ENOMEM;
break;
}
context = dev->tx_contexts + i;
context->dev = dev;
context->urb = urb;
usb_fill_bulk_urb(urb, dev->udev,
usb_sndbulkpipe(dev->udev, dev->ep_msg_out),
buf, dev->adapter->tx_buffer_size,
peak_usb_write_bulk_callback, context);
/* ask last usb_free_urb() to also kfree() transfer_buffer */
urb->transfer_flags |= URB_FREE_BUFFER;
}
/* warn if we were not able to allocate enough tx contexts */
if (i < PCAN_USB_MAX_TX_URBS) {
if (i == 0) {
netdev_err(netdev, "couldn't setup any tx URB\n");
goto err_tx;
}
netdev_warn(netdev, "tx performance may be slow\n");
}
if (dev->adapter->dev_start) {
err = dev->adapter->dev_start(dev);
if (err)
goto err_adapter;
}
dev->state |= PCAN_USB_STATE_STARTED;
/* can set bus on now */
if (dev->adapter->dev_set_bus) {
err = dev->adapter->dev_set_bus(dev, 1);
if (err)
goto err_adapter;
}
dev->can.state = CAN_STATE_ERROR_ACTIVE;
return 0;
err_adapter:
if (err == -ENODEV)
netif_device_detach(dev->netdev);
netdev_warn(netdev, "couldn't submit control: %d\n", err);
for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
usb_free_urb(dev->tx_contexts[i].urb);
dev->tx_contexts[i].urb = NULL;
}
err_tx:
usb_kill_anchored_urbs(&dev->rx_submitted);
return err;
}
/*
* called by netdev to open the corresponding CAN interface.
*/
static int peak_usb_ndo_open(struct net_device *netdev)
{
struct peak_usb_device *dev = netdev_priv(netdev);
int err;
/* common open */
err = open_candev(netdev);
if (err)
return err;
/* finally start device */
err = peak_usb_start(dev);
if (err) {
netdev_err(netdev, "couldn't start device: %d\n", err);
close_candev(netdev);
return err;
}
netif_start_queue(netdev);
return 0;
}
/*
* unlink in-flight Rx and Tx urbs and free their memory.
*/
static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev)
{
int i;
/* free all Rx (submitted) urbs */
usb_kill_anchored_urbs(&dev->rx_submitted);
/* free unsubmitted Tx urbs first */
for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
struct urb *urb = dev->tx_contexts[i].urb;
if (!urb ||
dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) {
/*
* this urb is already released or always submitted,
* let usb core free by itself
*/
continue;
}
usb_free_urb(urb);
dev->tx_contexts[i].urb = NULL;
}
/* then free all submitted Tx urbs */
usb_kill_anchored_urbs(&dev->tx_submitted);
atomic_set(&dev->active_tx_urbs, 0);
}
/*
* called by netdev to close the corresponding CAN interface.
*/
static int peak_usb_ndo_stop(struct net_device *netdev)
{
struct peak_usb_device *dev = netdev_priv(netdev);
dev->state &= ~PCAN_USB_STATE_STARTED;
netif_stop_queue(netdev);
/* unlink all pending urbs and free used memory */
peak_usb_unlink_all_urbs(dev);
if (dev->adapter->dev_stop)
dev->adapter->dev_stop(dev);
close_candev(netdev);
dev->can.state = CAN_STATE_STOPPED;
/* can set bus off now */
if (dev->adapter->dev_set_bus) {
int err = dev->adapter->dev_set_bus(dev, 0);
if (err)
return err;
}
return 0;
}
/*
* handle end of waiting for the device to reset
*/
void peak_usb_restart_complete(struct peak_usb_device *dev)
{
/* finally MUST update can state */
dev->can.state = CAN_STATE_ERROR_ACTIVE;
/* netdev queue can be awaken now */
netif_wake_queue(dev->netdev);
}
void peak_usb_async_complete(struct urb *urb)
{
kfree(urb->transfer_buffer);
usb_free_urb(urb);
}
/*
* device (auto-)restart mechanism runs in a timer context =>
* MUST handle restart with asynchronous usb transfers
*/
static int peak_usb_restart(struct peak_usb_device *dev)
{
struct urb *urb;
int err;
u8 *buf;
/*
* if device doesn't define any asynchronous restart handler, simply
* wake the netdev queue up
*/
if (!dev->adapter->dev_restart_async) {
peak_usb_restart_complete(dev);
return 0;
}
/* first allocate a urb to handle the asynchronous steps */
urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!urb) {
netdev_err(dev->netdev, "no memory left for urb\n");
return -ENOMEM;
}
/* also allocate enough space for the commands to send */
buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC);
if (!buf) {
usb_free_urb(urb);
return -ENOMEM;
}
/* call the device specific handler for the restart */
err = dev->adapter->dev_restart_async(dev, urb, buf);
if (!err)
return 0;
kfree(buf);
usb_free_urb(urb);
return err;
}
/*
* candev callback used to change CAN mode.
* Warning: this is called from a timer context!
*/
static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode)
{
struct peak_usb_device *dev = netdev_priv(netdev);
int err = 0;
switch (mode) {
case CAN_MODE_START:
err = peak_usb_restart(dev);
if (err)
netdev_err(netdev, "couldn't start device (err %d)\n",
err);
break;
default:
return -EOPNOTSUPP;
}
return err;
}
/*
* candev callback used to set device bitrate.
*/
static int peak_usb_set_bittiming(struct net_device *netdev)
{
struct peak_usb_device *dev = netdev_priv(netdev);
struct can_bittiming *bt = &dev->can.bittiming;
if (dev->adapter->dev_set_bittiming) {
int err = dev->adapter->dev_set_bittiming(dev, bt);
if (err)
netdev_info(netdev, "couldn't set bitrate (err %d)\n",
err);
return err;
}
return 0;
}
static const struct net_device_ops peak_usb_netdev_ops = {
.ndo_open = peak_usb_ndo_open,
.ndo_stop = peak_usb_ndo_stop,
.ndo_start_xmit = peak_usb_ndo_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
/*
* create one device which is attached to CAN controller #ctrl_idx of the
* usb adapter.
*/
static int peak_usb_create_dev(struct peak_usb_adapter *peak_usb_adapter,
struct usb_interface *intf, int ctrl_idx)
{
struct usb_device *usb_dev = interface_to_usbdev(intf);
int sizeof_candev = peak_usb_adapter->sizeof_dev_private;
struct peak_usb_device *dev;
struct net_device *netdev;
int i, err;
u16 tmp16;
if (sizeof_candev < sizeof(struct peak_usb_device))
sizeof_candev = sizeof(struct peak_usb_device);
netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS);
if (!netdev) {
dev_err(&intf->dev, "%s: couldn't alloc candev\n",
PCAN_USB_DRIVER_NAME);
return -ENOMEM;
}
dev = netdev_priv(netdev);
/* allocate a buffer large enough to send commands */
dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
if (!dev->cmd_buf) {
err = -ENOMEM;
goto lbl_free_candev;
}
dev->udev = usb_dev;
dev->netdev = netdev;
dev->adapter = peak_usb_adapter;
dev->ctrl_idx = ctrl_idx;
dev->state = PCAN_USB_STATE_CONNECTED;
dev->ep_msg_in = peak_usb_adapter->ep_msg_in;
dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
dev->can.clock = peak_usb_adapter->clock;
dev->can.bittiming_const = &peak_usb_adapter->bittiming_const;
dev->can.do_set_bittiming = peak_usb_set_bittiming;
dev->can.do_set_mode = peak_usb_set_mode;
dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
CAN_CTRLMODE_LISTENONLY;
netdev->netdev_ops = &peak_usb_netdev_ops;
netdev->flags |= IFF_ECHO; /* we support local echo */
init_usb_anchor(&dev->rx_submitted);
init_usb_anchor(&dev->tx_submitted);
atomic_set(&dev->active_tx_urbs, 0);
for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS;
dev->prev_siblings = usb_get_intfdata(intf);
usb_set_intfdata(intf, dev);
SET_NETDEV_DEV(netdev, &intf->dev);
netdev->dev_id = ctrl_idx;
err = register_candev(netdev);
if (err) {
dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
goto lbl_restore_intf_data;
}
if (dev->prev_siblings)
(dev->prev_siblings)->next_siblings = dev;
/* keep hw revision into the netdevice */
tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice);
dev->device_rev = tmp16 >> 8;
if (dev->adapter->dev_init) {
err = dev->adapter->dev_init(dev);
if (err)
goto lbl_unregister_candev;
}
/* set bus off */
if (dev->adapter->dev_set_bus) {
err = dev->adapter->dev_set_bus(dev, 0);
if (err)
goto lbl_unregister_candev;
}
/* get device number early */
if (dev->adapter->dev_get_device_id)
dev->adapter->dev_get_device_id(dev, &dev->device_number);
netdev_info(netdev, "attached to %s channel %u (device %u)\n",
peak_usb_adapter->name, ctrl_idx, dev->device_number);
return 0;
lbl_unregister_candev:
unregister_candev(netdev);
lbl_restore_intf_data:
usb_set_intfdata(intf, dev->prev_siblings);
kfree(dev->cmd_buf);
lbl_free_candev:
free_candev(netdev);
return err;
}
/*
* called by the usb core when the device is unplugged from the system
*/
static void peak_usb_disconnect(struct usb_interface *intf)
{
struct peak_usb_device *dev;
/* unregister as many netdev devices as siblings */
for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
struct net_device *netdev = dev->netdev;
char name[IFNAMSIZ];
dev->state &= ~PCAN_USB_STATE_CONNECTED;
strncpy(name, netdev->name, IFNAMSIZ);
unregister_netdev(netdev);
free_candev(netdev);
kfree(dev->cmd_buf);
dev->next_siblings = NULL;
if (dev->adapter->dev_free)
dev->adapter->dev_free(dev);
dev_info(&intf->dev, "%s removed\n", name);
}
usb_set_intfdata(intf, NULL);
}
/*
* probe function for new PEAK-System devices
*/
static int peak_usb_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct usb_device *usb_dev = interface_to_usbdev(intf);
const u16 usb_id_product = le16_to_cpu(usb_dev->descriptor.idProduct);
struct peak_usb_adapter *peak_usb_adapter = NULL;
int i, err = -ENOMEM;
usb_dev = interface_to_usbdev(intf);
/* get corresponding PCAN-USB adapter */
for (i = 0; i < ARRAY_SIZE(peak_usb_adapters_list); i++)
if (peak_usb_adapters_list[i]->device_id == usb_id_product) {
peak_usb_adapter = peak_usb_adapters_list[i];
break;
}
if (!peak_usb_adapter) {
/* should never come except device_id bad usage in this file */
pr_err("%s: didn't find device id. 0x%x in devices list\n",
PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct);
return -ENODEV;
}
/* got corresponding adapter: check if it handles current interface */
if (peak_usb_adapter->intf_probe) {
err = peak_usb_adapter->intf_probe(intf);
if (err)
return err;
}
for (i = 0; i < peak_usb_adapter->ctrl_count; i++) {
err = peak_usb_create_dev(peak_usb_adapter, intf, i);
if (err) {
/* deregister already created devices */
peak_usb_disconnect(intf);
break;
}
}
return err;
}
/* usb specific object needed to register this driver with the usb subsystem */
static struct usb_driver peak_usb_driver = {
.name = PCAN_USB_DRIVER_NAME,
.disconnect = peak_usb_disconnect,
.probe = peak_usb_probe,
.id_table = peak_usb_table,
};
static int __init peak_usb_init(void)
{
int err;
/* register this driver with the USB subsystem */
err = usb_register(&peak_usb_driver);
if (err)
pr_err("%s: usb_register failed (err %d)\n",
PCAN_USB_DRIVER_NAME, err);
return err;
}
static int peak_usb_do_device_exit(struct device *d, void *arg)
{
struct usb_interface *intf = to_usb_interface(d);
struct peak_usb_device *dev;
/* stop as many netdev devices as siblings */
for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
struct net_device *netdev = dev->netdev;
if (netif_device_present(netdev))
if (dev->adapter->dev_exit)
dev->adapter->dev_exit(dev);
}
return 0;
}
static void __exit peak_usb_exit(void)
{
int err;
/* last chance do send any synchronous commands here */
err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL,
NULL, peak_usb_do_device_exit);
if (err)
pr_err("%s: failed to stop all can devices (err %d)\n",
PCAN_USB_DRIVER_NAME, err);
/* deregister this driver with the USB subsystem */
usb_deregister(&peak_usb_driver);
pr_info("%s: PCAN-USB interfaces driver unloaded\n",
PCAN_USB_DRIVER_NAME);
}
module_init(peak_usb_init);
module_exit(peak_usb_exit);
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