drivers/ec_slave.c
author Florian Pose <fp@igh-essen.com>
Fri, 16 Dec 2005 14:16:54 +0000
branchkernel2.6
changeset 34 c1e8d61fa395
parent 26 60435f959e5c
child 39 6965c23a6826
permissions -rw-r--r--
Compile-Informationen hinzugef?gt.
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/****************************************************************
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 *
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 *  e c _ s l a v e . c
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 *
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 *  Methoden für einen EtherCAT-Slave.
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 *
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 *  $Date$
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 *  $Author$
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 *
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 ***************************************************************/
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#include <linux/module.h>
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#include "ec_globals.h"
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#include "ec_slave.h"
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/***************************************************************/
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/**
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   EtherCAT-Slave-Konstruktor.
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   Initialisiert einen EtherCAT-Slave.
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   @param slave Zeiger auf den zu initialisierenden Slave
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*/
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void EtherCAT_slave_init(EtherCAT_slave_t *slave)
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{
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  slave->type = 0;
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  slave->revision = 0;
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  slave->build = 0;
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  slave->ring_position = 0;
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  slave->station_address = 0;
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  slave->vendor_id = 0;
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  slave->product_code = 0;
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  slave->revision_number = 0;
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  slave->serial_number = 0;
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  slave->desc = 0;
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  slave->logical_address0 = 0;
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  slave->current_state = ECAT_STATE_UNKNOWN;
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  slave->requested_state = ECAT_STATE_UNKNOWN;
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}
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/***************************************************************/
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/**
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   EtherCAT-Slave-Destruktor.
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   Im Moment ohne Funktionalität.
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   @param slave Zeiger auf den zu zerstörenden Slave
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*/
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void EtherCAT_slave_clear(EtherCAT_slave_t *slave)
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{
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  // Nothing yet...
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}
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/***************************************************************/
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/**
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   Liest einen bestimmten Kanal des Slaves als Integer-Wert.
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   Prüft zuerst, ob der entsprechende Slave eine
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   bekannte Beschreibung besitzt, ob dort eine
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   read()-Funktion hinterlegt ist und ob die angegebene
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   Kanalnummer gültig ist. Wenn ja, wird der dekodierte
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   Wert zurückgegeben, sonst ist der Wert 0.
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   @param slave EtherCAT-Slave
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   @param channel Kanalnummer
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   @return Gelesener Wert bzw. 0
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*/
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int EtherCAT_read_value(EtherCAT_slave_t *slave,
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                        unsigned int channel)
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{
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  if (!slave->desc)
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  {
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    printk(KERN_WARNING "EtherCAT: Reading failed on slave %04X (addr %0X)"
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           " - Slave has no description.\n",
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           slave->station_address, (unsigned int) slave);
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    return 0;
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  }
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  if (!slave->desc->read)
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  {
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    printk(KERN_WARNING "EtherCAT: Reading failed on slave %04X (addr %0X)"
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           " - Slave type (%s %s) has no read method.\n",
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           slave->station_address, (unsigned int) slave,
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           slave->desc->vendor_name, slave->desc->product_name);
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    return 0;
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  }
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  if (channel >= slave->desc->channels)
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  {
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    printk(KERN_WARNING "EtherCAT: Reading failed on slave %4X (addr %0X)"
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           " - Type (%s %s) has no channel %i.\n",
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           slave->station_address, (unsigned int) slave,
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           slave->desc->vendor_name, slave->desc->product_name,
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           channel);
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    return 0;
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  }
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  return slave->desc->read(slave->process_data, channel);
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}
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/***************************************************************/
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/**
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   Schreibt einen bestimmten Kanal des Slaves als Integer-Wert .
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   Prüft zuerst, ob der entsprechende Slave eine
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   bekannte Beschreibung besitzt, ob dort eine
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   write()-Funktion hinterlegt ist und ob die angegebene
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   Kanalnummer gültig ist. Wenn ja, wird der Wert entsprechend
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   kodiert und geschrieben.
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   @param slave EtherCAT-Slave
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   @param channel Kanalnummer
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   @param value Zu schreibender Wert
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*/
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void EtherCAT_write_value(EtherCAT_slave_t *slave,
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                          unsigned int channel,
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                          int value)
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{
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  if (!slave->desc)
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  {
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    printk(KERN_WARNING "EtherCAT: Writing failed on slave %04X (addr %0X)"
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           " - Slave has no description.\n",
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           slave->station_address, (unsigned int) slave);
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    return;
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  }
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  if (!slave->desc->write)
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  {
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    printk(KERN_WARNING "EtherCAT: Writing failed on slave %04X (addr %0X)"
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           " - Type (%s %s) has no write method.\n",
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           slave->station_address, (unsigned int) slave,
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           slave->desc->vendor_name, slave->desc->product_name);
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    return;
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  }
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  if (channel >= slave->desc->channels)
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  {
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    printk(KERN_WARNING "EtherCAT: Writing failed on slave %4X (addr %0X)"
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           " - Type (%s %s) has no channel %i.\n",
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           slave->station_address, (unsigned int) slave,
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           slave->desc->vendor_name, slave->desc->product_name,
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           channel);
0
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    return;
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  }
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  slave->desc->write(slave->process_data, channel, value);
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}
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/***************************************************************/
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EXPORT_SYMBOL(EtherCAT_write_value);
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EXPORT_SYMBOL(EtherCAT_read_value);