fp@39: /******************************************************************************
fp@0:  *
fp@39:  *  $Id$
fp@0:  *
fp@1326:  *  Copyright (C) 2006-2008  Florian Pose, Ingenieurgemeinschaft IgH
fp@197:  *
fp@197:  *  This file is part of the IgH EtherCAT Master.
fp@197:  *
fp@1326:  *  The IgH EtherCAT Master is free software; you can redistribute it and/or
fp@1326:  *  modify it under the terms of the GNU General Public License version 2, as
fp@1326:  *  published by the Free Software Foundation.
fp@1326:  *
fp@1326:  *  The IgH EtherCAT Master is distributed in the hope that it will be useful,
fp@1326:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
fp@1326:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
fp@1326:  *  Public License for more details.
fp@1326:  *
fp@1326:  *  You should have received a copy of the GNU General Public License along
fp@1326:  *  with the IgH EtherCAT Master; if not, write to the Free Software
fp@197:  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
fp@197:  *
fp@1363:  *  ---
fp@1363:  *
fp@1363:  *  The license mentioned above concerns the source code only. Using the
fp@1363:  *  EtherCAT technology and brand is only permitted in compliance with the
fp@1363:  *  industrial property and similar rights of Beckhoff Automation GmbH.
fp@246:  *
fp@39:  *****************************************************************************/
fp@0: 
fp@199: /**
fp@199:    \file
fp@199:    EtherCAT device methods.
fp@199: */
fp@199: 
fp@199: /*****************************************************************************/
fp@199: 
fp@24: #include <linux/module.h>
fp@0: #include <linux/skbuff.h>
fp@0: #include <linux/if_ether.h>
fp@0: #include <linux/netdevice.h>
fp@0: 
fp@54: #include "device.h"
fp@78: #include "master.h"
fp@0: 
fp@692: #ifdef EC_DEBUG_RING
fp@692: #define timersub(a, b, result) \
fp@692:     do { \
fp@692:         (result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
fp@692:         (result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
fp@692:         if ((result)->tv_usec < 0) { \
fp@692:             --(result)->tv_sec; \
fp@692:             (result)->tv_usec += 1000000; \
fp@692:         } \
fp@692:     } while (0)
fp@692: #endif
fp@692: 
fp@1851: static const unsigned int rate_intervals[] = {
fp@1851:     1, 10, 60
fp@1851: };
fp@1851: 
fp@39: /*****************************************************************************/
fp@0: 
fp@1011: /** Constructor.
fp@1011:  * 
fp@1011:  * \return 0 in case of success, else < 0
fp@1011:  */
fp@1011: int ec_device_init(
fp@1011:         ec_device_t *device, /**< EtherCAT device */
fp@579:         ec_master_t *master /**< master owning the device */
fp@579:         )
fp@579: {
fp@1313:     int ret;
fp@693:     unsigned int i;
fp@693:     struct ethhdr *eth;
fp@687: #ifdef EC_DEBUG_IF
fp@687:     char ifname[10];
fp@687:     char mb = 'x';
fp@687: #endif
fp@692: #ifdef EC_DEBUG_RING
fp@692:     device->debug_frame_index = 0;
fp@692:     device->debug_frame_count = 0;
fp@692: #endif
fp@687: 
fp@78:     device->master = master;
fp@693:     device->tx_ring_index = 0;
fp@579: 
fp@679: #ifdef EC_DEBUG_IF
fp@687:     if (device == &master->main_device)
fp@687:         mb = 'm';
fp@687:     else if (device == &master->backup_device)
fp@687:         mb = 'b';
fp@687: 
fp@687:     sprintf(ifname, "ecdbg%c%u", mb, master->index);
fp@687: 
fp@1313:     ret = ec_debug_init(&device->dbg, ifname);
fp@1313:     if (ret < 0) {
fp@579:         EC_ERR("Failed to init debug device!\n");
fp@579:         goto out_return;
fp@579:     }
fp@579: #endif
fp@579: 
fp@693:     for (i = 0; i < EC_TX_RING_SIZE; i++)
fp@693:         device->tx_skb[i] = NULL;
fp@693: 
fp@693:     for (i = 0; i < EC_TX_RING_SIZE; i++) {
fp@693:         if (!(device->tx_skb[i] = dev_alloc_skb(ETH_FRAME_LEN))) {
fp@693:             EC_ERR("Error allocating device socket buffer!\n");
fp@1313:             ret = -ENOMEM;
fp@693:             goto out_tx_ring;
fp@693:         }
fp@693: 
fp@693:         // add Ethernet-II-header
fp@693:         skb_reserve(device->tx_skb[i], ETH_HLEN);
fp@693:         eth = (struct ethhdr *) skb_push(device->tx_skb[i], ETH_HLEN);
fp@693:         eth->h_proto = htons(0x88A4);
fp@693:         memset(eth->h_dest, 0xFF, ETH_ALEN);
fp@693:     }
fp@579: 
fp@579:     ec_device_detach(device); // resets remaining fields
fp@579:     return 0;
fp@579: 
fp@693: out_tx_ring:
fp@693:     for (i = 0; i < EC_TX_RING_SIZE; i++)
fp@693:         if (device->tx_skb[i])
fp@693:             dev_kfree_skb(device->tx_skb[i]);
fp@693: #ifdef EC_DEBUG_IF
fp@579:     ec_debug_clear(&device->dbg);
fp@693: out_return:
fp@693: #endif
fp@1313:     return ret;
fp@1313: }
fp@1313: 
fp@1313: /*****************************************************************************/
fp@1313: 
fp@1313: /** Destructor.
fp@1011:  */
fp@1011: void ec_device_clear(
fp@1011:         ec_device_t *device /**< EtherCAT device */
fp@1011:         )
fp@579: {
fp@693:     unsigned int i;
fp@693: 
fp@579:     if (device->open) ec_device_close(device);
fp@693:     for (i = 0; i < EC_TX_RING_SIZE; i++)
fp@693:         dev_kfree_skb(device->tx_skb[i]);
fp@679: #ifdef EC_DEBUG_IF
fp@579:     ec_debug_clear(&device->dbg);
fp@579: #endif
fp@579: }
fp@579: 
fp@579: /*****************************************************************************/
fp@579: 
fp@1011: /** Associate with net_device.
fp@1011:  */
fp@1011: void ec_device_attach(
fp@1011:         ec_device_t *device, /**< EtherCAT device */
fp@579:         struct net_device *net_dev, /**< net_device structure */
fp@579:         ec_pollfunc_t poll, /**< pointer to device's poll function */
fp@579:         struct module *module /**< the device's module */
fp@579:         )
fp@579: {
fp@693:     unsigned int i;
fp@693:     struct ethhdr *eth;
fp@693: 
fp@579:     ec_device_detach(device); // resets fields
fp@579: 
fp@98:     device->dev = net_dev;
fp@533:     device->poll = poll;
fp@539:     device->module = module;
fp@98: 
fp@693:     for (i = 0; i < EC_TX_RING_SIZE; i++) {
fp@693:         device->tx_skb[i]->dev = net_dev;
fp@759:         eth = (struct ethhdr *) (device->tx_skb[i]->data);
fp@693:         memcpy(eth->h_source, net_dev->dev_addr, ETH_ALEN);
fp@693:     }
fp@1305: 
fp@1305: #ifdef EC_DEBUG_IF
fp@1305:     ec_debug_register(&device->dbg, net_dev);
fp@1305: #endif
fp@579: }
fp@579: 
fp@579: /*****************************************************************************/
fp@579: 
fp@1011: /** Disconnect from net_device.
fp@1011:  */
fp@1011: void ec_device_detach(
fp@1011:         ec_device_t *device /**< EtherCAT device */
fp@1011:         )
fp@579: {
fp@693:     unsigned int i;
fp@693: 
fp@1305: #ifdef EC_DEBUG_IF
fp@1305:     ec_debug_unregister(&device->dbg);
fp@1305: #endif
fp@1305: 
fp@579:     device->dev = NULL;
fp@579:     device->poll = NULL;
fp@579:     device->module = NULL;
fp@78:     device->open = 0;
fp@96:     device->link_state = 0; // down
fp@493:     device->tx_count = 0;
fp@493:     device->rx_count = 0;
fp@1851:     device->last_tx_count = 0;
fp@1851:     device->last_loss = 0;
fp@1851:     for (i = 0; i < EC_RATE_COUNT; i++) {
fp@1851:         device->tx_rates[i] = 0;
fp@1851:         device->loss_rates[i] = 0;
fp@1851:     }
fp@1851:     device->stats_jiffies = 0;
fp@693:     for (i = 0; i < EC_TX_RING_SIZE; i++)
fp@693:         device->tx_skb[i]->dev = NULL;
fp@0: }
fp@0: 
fp@39: /*****************************************************************************/
fp@0: 
fp@1011: /** Opens the EtherCAT device.
fp@1011:  *
fp@1011:  * \return 0 in case of success, else < 0
fp@1011:  */
fp@1011: int ec_device_open(
fp@1011:         ec_device_t *device /**< EtherCAT device */
fp@1011:         )
fp@0: {
fp@1313:     int ret;
fp@1851:     unsigned int i;
fp@1313: 
fp@78:     if (!device->dev) {
fp@84:         EC_ERR("No net_device to open!\n");
fp@1313:         return -ENODEV;
fp@73:     }
fp@73: 
fp@78:     if (device->open) {
fp@84:         EC_WARN("Device already opened!\n");
fp@91:         return 0;
fp@91:     }
fp@91: 
fp@96:     device->link_state = 0;
fp@493:     device->tx_count = 0;
fp@493:     device->rx_count = 0;
fp@1851:     device->last_tx_count = 0;
fp@1851:     device->last_loss = 0;
fp@1851:     for (i = 0; i < EC_RATE_COUNT; i++) {
fp@1851:         device->tx_rates[i] = 0;
fp@1851:         device->loss_rates[i] = 0;
fp@1851:     }
fp@1851:     device->stats_jiffies = 0;
fp@91: 
fp@1476: #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
fp@1476:     ret = device->dev->netdev_ops->ndo_open(device->dev);
fp@1476: #else
fp@1313:     ret = device->dev->open(device->dev);
fp@1476: #endif
fp@1313:     if (!ret)
fp@1313:         device->open = 1;
fp@1313: 
fp@1313:     return ret;
fp@0: }
fp@0: 
fp@39: /*****************************************************************************/
fp@0: 
fp@1011: /** Stops the EtherCAT device.
fp@1011:  *
fp@1011:  * \return 0 in case of success, else < 0
fp@1011:  */
fp@1011: int ec_device_close(
fp@1011:         ec_device_t *device /**< EtherCAT device */
fp@1011:         )
fp@78: {
fp@1313:     int ret;
fp@1313: 
fp@78:     if (!device->dev) {
fp@84:         EC_ERR("No device to close!\n");
fp@1313:         return -ENODEV;
fp@73:     }
fp@73: 
fp@78:     if (!device->open) {
fp@84:         EC_WARN("Device already closed!\n");
fp@98:         return 0;
fp@98:     }
fp@98: 
fp@1476: #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
fp@1476:     ret = device->dev->netdev_ops->ndo_stop(device->dev);
fp@1476: #else
fp@1313:     ret = device->dev->stop(device->dev);
fp@1476: #endif
fp@1313:     if (!ret)
fp@1313:         device->open = 0;
fp@1313: 
fp@1313:     return ret;
fp@73: }
fp@73: 
fp@73: /*****************************************************************************/
fp@73: 
fp@1011: /** Returns a pointer to the device's transmit memory.
fp@1011:  *
fp@1011:  * \return pointer to the TX socket buffer
fp@1011:  */
fp@1011: uint8_t *ec_device_tx_data(
fp@1011:         ec_device_t *device /**< EtherCAT device */
fp@1011:         )
fp@98: {
fp@693:     /* cycle through socket buffers, because otherwise there is a race
fp@693:      * condition, if multiple frames are sent and the DMA is not scheduled in
fp@693:      * between. */
fp@693:     device->tx_ring_index++;
fp@693:     device->tx_ring_index %= EC_TX_RING_SIZE;
fp@693:     return device->tx_skb[device->tx_ring_index]->data + ETH_HLEN;
fp@0: }
fp@0: 
fp@39: /*****************************************************************************/
fp@0: 
fp@1011: /** Sends the content of the transmit socket buffer.
fp@1011:  *
fp@1011:  * Cuts the socket buffer content to the (now known) size, and calls the
fp@1011:  * start_xmit() function of the assigned net_device.
fp@1011:  */
fp@1011: void ec_device_send(
fp@1011:         ec_device_t *device, /**< EtherCAT device */
fp@1011:         size_t size /**< number of bytes to send */
fp@1011:         )
fp@73: {
fp@693:     struct sk_buff *skb = device->tx_skb[device->tx_ring_index];
fp@693: 
fp@1851:     // frame statistics
fp@1851:     if (unlikely(jiffies - device->stats_jiffies >= HZ)) {
fp@1851:         unsigned int i;
fp@1851:         unsigned int tx_rate = device->tx_count - device->last_tx_count;
fp@1851:         int loss = device->tx_count - device->rx_count;
fp@1851:         int loss_rate = (loss - device->last_loss) * 1000;
fp@1851:         for (i = 0; i < EC_RATE_COUNT; i++) {
fp@1851:             unsigned int n = rate_intervals[i];
fp@1851:             device->tx_rates[i] =
fp@1851:                 device->tx_rates[i] * (n - 1) +
fp@1851:                 tx_rate * n;
fp@1851:             device->loss_rates[i] =
fp@1851:                 device->loss_rates[i] * (n - 1) +
fp@1851:                 loss_rate * n;
fp@1851:         }
fp@1851:         device->last_tx_count = device->tx_count;
fp@1851:         device->last_loss = loss;
fp@1851:         device->stats_jiffies += HZ;
fp@1851:     }
fp@1851: 
fp@97:     if (unlikely(!device->link_state)) // Link down
fp@96:         return;
fp@96: 
fp@195:     // set the right length for the data
fp@693:     skb->len = ETH_HLEN + size;
fp@78: 
fp@78:     if (unlikely(device->master->debug_level > 1)) {
fp@1554:         EC_DBG("Sending frame:\n");
fp@1554:         ec_print_data(skb->data, ETH_HLEN + size);
fp@693:     }
fp@693: 
fp@195:     // start sending
fp@1476: #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 29)
fp@1554:     if (device->dev->netdev_ops->ndo_start_xmit(skb, device->dev) ==
fp@1554:             NETDEV_TX_OK)
fp@1476: #else
fp@1554:     if (device->dev->hard_start_xmit(skb, device->dev) == NETDEV_TX_OK)
fp@1554: #endif
fp@1554:     {
fp@1507:         device->tx_count++;
fp@1507: #ifdef EC_DEBUG_IF
fp@1507:         ec_debug_send(&device->dbg, skb->data, ETH_HLEN + size);
fp@725: #endif
fp@725: #ifdef EC_DEBUG_RING
fp@1507:         ec_device_debug_ring_append(
fp@1507:                 device, TX, skb->data + ETH_HLEN, size);
fp@1507: #endif
fp@1507:     }
fp@73: }
fp@73: 
fp@73: /*****************************************************************************/
fp@73: 
fp@692: #ifdef EC_DEBUG_RING
fp@1011: /** Appends frame data to the debug ring.
fp@1011:  */
fp@692: void ec_device_debug_ring_append(
fp@692:         ec_device_t *device, /**< EtherCAT device */
fp@692:         ec_debug_frame_dir_t dir, /**< direction */
fp@692:         const void *data, /**< frame data */
fp@692:         size_t size /**< data size */
fp@692:         )
fp@692: {
fp@692:     ec_debug_frame_t *df = &device->debug_frames[device->debug_frame_index];
fp@692: 
fp@692:     df->dir = dir;
fp@692:     if (dir == TX)
fp@692:         do_gettimeofday(&df->t);
fp@692:     else
fp@692:         df->t = device->timeval_poll;
fp@692:     memcpy(df->data, data, size);
fp@692:     df->data_size = size;
fp@692: 
fp@692:     device->debug_frame_index++;
fp@692:     device->debug_frame_index %= EC_DEBUG_RING_SIZE;
fp@692:     if (unlikely(device->debug_frame_count < EC_DEBUG_RING_SIZE))
fp@692:         device->debug_frame_count++;
fp@692: }
fp@692: 
fp@692: /*****************************************************************************/
fp@692: 
fp@1011: /** Outputs the debug ring.
fp@1011:  */
fp@692: void ec_device_debug_ring_print(
fp@692:         const ec_device_t *device /**< EtherCAT device */
fp@692:         )
fp@692: {
fp@692:     int i;
fp@692:     unsigned int ring_index;
fp@692:     const ec_debug_frame_t *df;
fp@692:     struct timeval t0, diff;
fp@692: 
fp@692:     // calculate index of the newest frame in the ring to get its time
fp@692:     ring_index = (device->debug_frame_index + EC_DEBUG_RING_SIZE - 1)
fp@692:         % EC_DEBUG_RING_SIZE;
fp@692:     t0 = device->debug_frames[ring_index].t;
fp@692: 
fp@986:     EC_DBG("Debug ring %u:\n", ring_index);
fp@692: 
fp@692:     // calculate index of the oldest frame in the ring
fp@692:     ring_index = (device->debug_frame_index + EC_DEBUG_RING_SIZE
fp@692:             - device->debug_frame_count) % EC_DEBUG_RING_SIZE;
fp@692: 
fp@692:     for (i = 0; i < device->debug_frame_count; i++) {
fp@692:         df = &device->debug_frames[ring_index];
fp@692:         timersub(&t0, &df->t, &diff);
fp@692: 
fp@986:         EC_DBG("Frame %u, dt=%u.%06u s, %s:\n",
fp@692:                 i + 1 - device->debug_frame_count,
fp@692:                 (unsigned int) diff.tv_sec,
fp@692:                 (unsigned int) diff.tv_usec,
fp@692:                 (df->dir == TX) ? "TX" : "RX");
fp@692:         ec_print_data(df->data, df->data_size);
fp@692: 
fp@692:         ring_index++;
fp@692:         ring_index %= EC_DEBUG_RING_SIZE;
fp@692:     }
fp@692: }
fp@692: #endif
fp@692: 
fp@692: /*****************************************************************************/
fp@692: 
fp@1011: /** Calls the poll function of the assigned net_device.
fp@1011:  *
fp@1011:  * The master itself works without using interrupts. Therefore the processing
fp@1011:  * of received data and status changes of the network device has to be
fp@1011:  * done by the master calling the ISR "manually".
fp@1011:  */
fp@1011: void ec_device_poll(
fp@1011:         ec_device_t *device /**< EtherCAT device */
fp@1011:         )
fp@533: {
fp@1040: #ifdef EC_HAVE_CYCLES
fp@533:     device->cycles_poll = get_cycles();
fp@1040: #endif
fp@533:     device->jiffies_poll = jiffies;
fp@692: #ifdef EC_DEBUG_RING
fp@692:     do_gettimeofday(&device->timeval_poll);
fp@692: #endif
fp@533:     device->poll(device->dev);
fp@39: }
fp@39: 
fp@54: /******************************************************************************
fp@195:  *  Device interface
fp@54:  *****************************************************************************/
fp@54: 
fp@1011: /** Withdraws an EtherCAT device from the master.
fp@1011:  *
fp@1011:  * The device is disconnected from the master and all device ressources
fp@1011:  * are freed.
fp@1011:  *
fp@1011:  * \attention Before calling this function, the ecdev_stop() function has
fp@1011:  *            to be called, to be sure that the master does not use the device
fp@1011:  *            any more.
fp@1011:  * \ingroup DeviceInterface
fp@1011:  */
fp@1011: void ecdev_withdraw(ec_device_t *device /**< EtherCAT device */)
fp@1011: {
fp@1011:     ec_master_t *master = device->master;
fp@1011:     char str[20];
fp@1011: 
fp@1011:     ec_mac_print(device->dev->dev_addr, str);
fp@1011:     EC_INFO("Master %u releasing main device %s.\n", master->index, str);
fp@1011:     
fp@1011:     down(&master->device_sem);
fp@1011:     ec_device_detach(device);
fp@1011:     up(&master->device_sem);
fp@1011: }
fp@1011: 
fp@1011: /*****************************************************************************/
fp@1011: 
fp@1029: /** Opens the network device and makes the master enter IDLE phase.
fp@1011:  *
fp@1011:  * \return 0 on success, else < 0
fp@1011:  * \ingroup DeviceInterface
fp@1011:  */
fp@1011: int ecdev_open(ec_device_t *device /**< EtherCAT device */)
fp@1011: {
fp@1313:     int ret;
fp@1313: 
fp@1313:     ret = ec_device_open(device);
fp@1313:     if (ret) {
fp@1011:         EC_ERR("Failed to open device!\n");
fp@1313:         return ret;
fp@1313:     }
fp@1313: 
fp@1313:     ret = ec_master_enter_idle_phase(device->master);
fp@1313:     if (ret) {
fp@1029:         EC_ERR("Failed to enter IDLE phase!\n");
fp@1313:         return ret;
fp@1011:     }
fp@1011: 
fp@1011:     return 0;
fp@1011: }
fp@1011: 
fp@1011: /*****************************************************************************/
fp@1011: 
fp@1029: /** Makes the master leave IDLE phase and closes the network device.
fp@1011:  *
fp@1011:  * \return 0 on success, else < 0
fp@1011:  * \ingroup DeviceInterface
fp@1011:  */
fp@1011: void ecdev_close(ec_device_t *device /**< EtherCAT device */)
fp@1011: {
fp@1029:     ec_master_leave_idle_phase(device->master);
fp@1011: 
fp@1011:     if (ec_device_close(device))
fp@1011:         EC_WARN("Failed to close device!\n");
fp@1011: }
fp@1011: 
fp@1011: /*****************************************************************************/
fp@1011: 
fp@1011: /** Accepts a received frame.
fp@1011:  *
fp@1011:  * Forwards the received data to the master. The master will analyze the frame
fp@1011:  * and dispatch the received commands to the sending instances.
fp@1011:  * 
fp@1011:  * \ingroup DeviceInterface
fp@1011:  */
fp@1011: void ecdev_receive(
fp@1011:         ec_device_t *device, /**< EtherCAT device */
fp@1011:         const void *data, /**< pointer to received data */
fp@1011:         size_t size /**< number of bytes received */
fp@1011:         )
fp@73: {
fp@692:     const void *ec_data = data + ETH_HLEN;
fp@692:     size_t ec_size = size - ETH_HLEN;
fp@1521: 
fp@1521:     if (unlikely(!data)) {
fp@1521:         EC_WARN("%s() called with NULL data.\n", __func__);
fp@1521:         return;
fp@1521:     }
fp@1521: 
fp@493:     device->rx_count++;
fp@493: 
fp@78:     if (unlikely(device->master->debug_level > 1)) {
fp@84:         EC_DBG("Received frame:\n");
fp@1554:         ec_print_data(data, size);
fp@231:     }
fp@231: 
fp@679: #ifdef EC_DEBUG_IF
fp@231:     ec_debug_send(&device->dbg, data, size);
fp@392: #endif
fp@692: #ifdef EC_DEBUG_RING
fp@692:     ec_device_debug_ring_append(device, RX, ec_data, ec_size);
fp@692: #endif
fp@692: 
fp@692:     ec_master_receive_datagrams(device->master, ec_data, ec_size);
fp@54: }
fp@54: 
fp@54: /*****************************************************************************/
fp@54: 
fp@1011: /** Sets a new link state.
fp@1011:  *
fp@1011:  * If the device notifies the master about the link being down, the master
fp@1011:  * will not try to send frames using this device.
fp@1011:  * 
fp@1011:  * \ingroup DeviceInterface
fp@1011:  */
fp@1011: void ecdev_set_link(
fp@1011:         ec_device_t *device, /**< EtherCAT device */
fp@670:         uint8_t state /**< new link state */
fp@670:         )
fp@104: {
fp@191:     if (unlikely(!device)) {
fp@1011:         EC_WARN("ecdev_set_link(): No device!\n");
fp@191:         return;
fp@191:     }
fp@191: 
fp@104:     if (likely(state != device->link_state)) {
fp@96:         device->link_state = state;
fp@96:         EC_INFO("Link state changed to %s.\n", (state ? "UP" : "DOWN"));
fp@96:     }
fp@96: }
fp@96: 
fp@96: /*****************************************************************************/
fp@96: 
fp@1011: /** Reads the link state.
fp@1011:  *
fp@1011:  * \ingroup DeviceInterface
fp@1011:  */
fp@1011: uint8_t ecdev_get_link(
fp@1011:         const ec_device_t *device /**< EtherCAT device */
fp@1011:         )
fp@670: {
fp@670:     if (unlikely(!device)) {
fp@1011:         EC_WARN("ecdev_get_link(): No device!\n");
fp@670:         return 0;
fp@670:     }
fp@670: 
fp@670:     return device->link_state;
fp@670: }
fp@670: 
fp@670: /*****************************************************************************/
fp@670: 
fp@199: /** \cond */
fp@199: 
fp@1011: EXPORT_SYMBOL(ecdev_withdraw);
fp@1011: EXPORT_SYMBOL(ecdev_open);
fp@1011: EXPORT_SYMBOL(ecdev_close);
fp@104: EXPORT_SYMBOL(ecdev_receive);
fp@670: EXPORT_SYMBOL(ecdev_get_link);
fp@670: EXPORT_SYMBOL(ecdev_set_link);
fp@27: 
fp@199: /** \endcond */
fp@199: 
fp@199: /*****************************************************************************/