Support scheduler parameters in kernels >= 4.11.
/******************************************************************************
*
* $Id$
*
* Copyright (C) 2006-2008 Florian Pose, Ingenieurgemeinschaft IgH
*
* This file is part of the IgH EtherCAT Master.
*
* The IgH EtherCAT Master is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2, as
* published by the Free Software Foundation.
*
* The IgH EtherCAT Master is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with the IgH EtherCAT Master; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* ---
*
* The license mentioned above concerns the source code only. Using the
* EtherCAT technology and brand is only permitted in compliance with the
* industrial property and similar rights of Beckhoff Automation GmbH.
*
*****************************************************************************/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
#include <linux/semaphore.h>
#else
#include <asm/semaphore.h>
#endif
#include "../../include/ecrt.h" // EtherCAT realtime interface
#include "serial.h"
/*****************************************************************************/
// Module parameters
#define FREQUENCY 100
// Optional features
#define PFX "ec_tty_example: "
/*****************************************************************************/
// EtherCAT
static ec_master_t *master = NULL;
static ec_master_state_t master_state = {};
struct semaphore master_sem;
static ec_domain_t *domain1 = NULL;
static ec_domain_state_t domain1_state = {};
// Timer
static struct timer_list timer;
/*****************************************************************************/
// process data
static uint8_t *domain1_pd; // process data memory
#define BusCouplerPos 0, 0
#define Beckhoff_EK1100 0x00000002, 0x044c2c52
static unsigned int counter = 0;
/*****************************************************************************/
void check_domain1_state(void)
{
ec_domain_state_t ds;
down(&master_sem);
ecrt_domain_state(domain1, &ds);
up(&master_sem);
if (ds.working_counter != domain1_state.working_counter)
printk(KERN_INFO PFX "Domain1: WC %u.\n", ds.working_counter);
if (ds.wc_state != domain1_state.wc_state)
printk(KERN_INFO PFX "Domain1: State %u.\n", ds.wc_state);
domain1_state = ds;
}
/*****************************************************************************/
void check_master_state(void)
{
ec_master_state_t ms;
down(&master_sem);
ecrt_master_state(master, &ms);
up(&master_sem);
if (ms.slaves_responding != master_state.slaves_responding)
printk(KERN_INFO PFX "%u slave(s).\n", ms.slaves_responding);
if (ms.al_states != master_state.al_states)
printk(KERN_INFO PFX "AL states: 0x%02X.\n", ms.al_states);
if (ms.link_up != master_state.link_up)
printk(KERN_INFO PFX "Link is %s.\n", ms.link_up ? "up" : "down");
master_state = ms;
}
/*****************************************************************************/
void cyclic_task(unsigned long data)
{
// receive process data
down(&master_sem);
ecrt_master_receive(master);
ecrt_domain_process(domain1);
up(&master_sem);
// check process data state (optional)
check_domain1_state();
if (counter) {
counter--;
} else { // do this at 1 Hz
counter = FREQUENCY;
// check for master state (optional)
check_master_state();
}
run_serial_devices(domain1_pd);
// send process data
down(&master_sem);
ecrt_domain_queue(domain1);
ecrt_master_send(master);
up(&master_sem);
// restart timer
timer.expires += HZ / FREQUENCY;
add_timer(&timer);
}
/*****************************************************************************/
void send_callback(void *cb_data)
{
ec_master_t *m = (ec_master_t *) cb_data;
down(&master_sem);
ecrt_master_send_ext(m);
up(&master_sem);
}
/*****************************************************************************/
void receive_callback(void *cb_data)
{
ec_master_t *m = (ec_master_t *) cb_data;
down(&master_sem);
ecrt_master_receive(m);
up(&master_sem);
}
/*****************************************************************************/
int __init init_mini_module(void)
{
int ret = -1;
ec_slave_config_t *sc;
printk(KERN_INFO PFX "Starting...\n");
master = ecrt_request_master(0);
if (!master) {
printk(KERN_ERR PFX "Requesting master 0 failed.\n");
ret = -EBUSY;
goto out_return;
}
sema_init(&master_sem, 1);
ecrt_master_callbacks(master, send_callback, receive_callback, master);
printk(KERN_INFO PFX "Registering domain...\n");
if (!(domain1 = ecrt_master_create_domain(master))) {
printk(KERN_ERR PFX "Domain creation failed!\n");
goto out_release_master;
}
// Create configuration for bus coupler
sc = ecrt_master_slave_config(master, BusCouplerPos, Beckhoff_EK1100);
if (!sc) {
printk(KERN_ERR PFX "Failed to create slave config.\n");
ret = -ENOMEM;
goto out_release_master;
}
create_serial_devices(master, domain1);
printk(KERN_INFO PFX "Activating master...\n");
if (ecrt_master_activate(master)) {
printk(KERN_ERR PFX "Failed to activate master!\n");
goto out_free_serial;
}
// Get internal process data for domain
domain1_pd = ecrt_domain_data(domain1);
printk(KERN_INFO PFX "Starting cyclic sample thread.\n");
init_timer(&timer);
timer.function = cyclic_task;
timer.expires = jiffies + 10;
add_timer(&timer);
printk(KERN_INFO PFX "Started.\n");
return 0;
out_free_serial:
free_serial_devices();
out_release_master:
printk(KERN_ERR PFX "Releasing master...\n");
ecrt_release_master(master);
out_return:
printk(KERN_ERR PFX "Failed to load. Aborting.\n");
return ret;
}
/*****************************************************************************/
void __exit cleanup_mini_module(void)
{
printk(KERN_INFO PFX "Stopping...\n");
del_timer_sync(&timer);
free_serial_devices();
printk(KERN_INFO PFX "Releasing master...\n");
ecrt_release_master(master);
printk(KERN_INFO PFX "Unloading.\n");
}
/*****************************************************************************/
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Florian Pose <fp@igh-essen.com>");
MODULE_DESCRIPTION("EtherCAT minimal test environment");
module_init(init_mini_module);
module_exit(cleanup_mini_module);
/*****************************************************************************/