1 files changed, 98 insertions, 0 deletions

diff --git a/drivers/misc/ibmasm/r_heartbeat.c b/drivers/misc/ibmasm/r_heartbeat.c
new file mode 100644
index 000000000000..93d9c1b2ad6f
--- /dev/null
+++ b/drivers/misc/ibmasm/r_heartbeat.c
@@ -0,0 +1,98 @@
+
+/*
+ * 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(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);
+}