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/*

 * 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; either version 2 of the License, or

 * (at your option) any later version.

 *

 * 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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 *

 * Copyright (C) IBM Corporation, 2004

 *

 * Author: Max Asböck <amax@us.ibm.com>

 *

 */

#include "ibmasm.h"

#include "dot_command.h"

/*

 * Reverse Heartbeat, i.e. heartbeats sent from the driver to the

 * service processor.

 * These heartbeats are initiated by user level programs.

 */

/* the reverse heartbeat dot command */

#pragma pack(1)

static struct {

        struct dot_command_header       header;

        unsigned char                   command[3];

} rhb_dot_cmd = {

        .header = {

                .type =         sp_read,

                .command_size = 3,

                .data_size =    0,

                .status =       0

        },

        .command = { 4, 3, 6 }

};

#pragma pack()

void ibmasm_init_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb)

{

        init_waitqueue_head(&rhb->wait);

        rhb->stopped = 0;

}

/**

 * start_reverse_heartbeat

 * Loop forever, sending a reverse heartbeat dot command to the service

 * processor, then sleeping. The loop comes to an end if the service

 * processor fails to respond 3 times or we were interrupted.

 */

int ibmasm_start_reverse_heartbeat(struct service_processor *sp, struct reverse_heartbeat *rhb)

{

        struct command *cmd;

        int times_failed = 0;

        int result = 1;

        cmd = ibmasm_new_command(sp, sizeof rhb_dot_cmd);

        if (!cmd)

                return -ENOMEM;

        while (times_failed < 3) {

                memcpy(cmd->buffer, (void *)&rhb_dot_cmd, sizeof rhb_dot_cmd);

                cmd->status = IBMASM_CMD_PENDING;

                ibmasm_exec_command(sp, cmd);

                ibmasm_wait_for_response(cmd, IBMASM_CMD_TIMEOUT_NORMAL);

                if (cmd->status != IBMASM_CMD_COMPLETE)

                        times_failed++;

                wait_event_interruptible_timeout(rhb->wait,

                        rhb->stopped,

                        REVERSE_HEARTBEAT_TIMEOUT * HZ);

                if (signal_pending(current) || rhb->stopped) {

                        result = -EINTR;

                        break;

                }

        }

        command_put(cmd);

        rhb->stopped = 0;

        return result;

}

void ibmasm_stop_reverse_heartbeat(struct reverse_heartbeat *rhb)

{

        rhb->stopped = 1;

        wake_up_interruptible(&rhb->wait);

}