/*
 * edac_module.c
 *
 * (C) 2007 www.softwarebitmaker.com
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 *
 * Author: Doug Thompson <dougthompson@xmission.com>
 *
 */
#include <linux/edac.h>

#include "edac_mc.h"
#include "edac_module.h"

#define EDAC_VERSION "Ver: 3.0.0"

#ifdef CONFIG_EDAC_DEBUG

static int edac_set_debug_level(const char *buf,
                                const struct kernel_param *kp)
{
        unsigned long val;
        int ret;

        ret = kstrtoul(buf, 0, &val);
        if (ret)
                return ret;

        if (val > 4)
                return -EINVAL;

        return param_set_int(buf, kp);
}

/* Values of 0 to 4 will generate output */
int edac_debug_level = 2;
EXPORT_SYMBOL_GPL(edac_debug_level);

module_param_call(edac_debug_level, edac_set_debug_level, param_get_int,
                  &edac_debug_level, 0644);
MODULE_PARM_DESC(edac_debug_level, "EDAC debug level: [0-4], default: 2");
#endif

/*
 * edac_op_state_to_string()
 */
char *edac_op_state_to_string(int opstate)
{
        if (opstate == OP_RUNNING_POLL)
                return "POLLED";
        else if (opstate == OP_RUNNING_INTERRUPT)
                return "INTERRUPT";
        else if (opstate == OP_RUNNING_POLL_INTR)
                return "POLL-INTR";
        else if (opstate == OP_ALLOC)
                return "ALLOC";
        else if (opstate == OP_OFFLINE)
                return "OFFLINE";

        return "UNKNOWN";
}

/*
 * sysfs object: /sys/devices/system/edac
 *      need to export to other files
 */
static const struct bus_type edac_subsys = {
        .name = "edac",
        .dev_name = "edac",
};

static int edac_subsys_init(void)
{
        int err;

        /* create the /sys/devices/system/edac directory */
        err = subsys_system_register(&edac_subsys, NULL);
        if (err)
                printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");

        return err;
}

static void edac_subsys_exit(void)
{
        bus_unregister(&edac_subsys);
}

/* return pointer to the 'edac' node in sysfs */
const struct bus_type *edac_get_sysfs_subsys(void)
{
        return &edac_subsys;
}
EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
/*
 * edac_init
 *      module initialization entry point
 */
static int __init edac_init(void)
{
        int err = 0;

        edac_printk(KERN_INFO, EDAC_MC, EDAC_VERSION "\n");

        err = edac_subsys_init();
        if (err)
                return err;

        /*
         * Harvest and clear any boot/initialization PCI parity errors
         *
         * FIXME: This only clears errors logged by devices present at time of
         *      module initialization.  We should also do an initial clear
         *      of each newly hotplugged device.
         */
        edac_pci_clear_parity_errors();

        err = edac_mc_sysfs_init();
        if (err)
                goto err_sysfs;

        edac_debugfs_init();

        err = edac_workqueue_setup();
        if (err) {
                edac_printk(KERN_ERR, EDAC_MC, "Failure initializing workqueue\n");
                goto err_wq;
        }

        return 0;

err_wq:
        edac_debugfs_exit();
        edac_mc_sysfs_exit();

err_sysfs:
        edac_subsys_exit();

        return err;
}

/*
 * edac_exit()
 *      module exit/termination function
 */
static void __exit edac_exit(void)
{
        edac_dbg(0, "\n");

        /* tear down the various subsystems */
        edac_workqueue_teardown();
        edac_mc_sysfs_exit();
        edac_debugfs_exit();
        edac_subsys_exit();
}

/*
 * Inform the kernel of our entry and exit points
 */
subsys_initcall(edac_init);
module_exit(edac_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Doug Thompson www.softwarebitmaker.com, et al");
MODULE_DESCRIPTION("Core library routines for EDAC reporting");