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-rw-r--r--drivers/char/ipmi/ipmi_si_sm.h104
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diff --git a/drivers/char/ipmi/ipmi_si_sm.h b/drivers/char/ipmi/ipmi_si_sm.h
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+++ b/drivers/char/ipmi/ipmi_si_sm.h
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * ipmi_si_sm.h
+ *
+ * State machine interface for low-level IPMI system management
+ * interface state machines. This code is the interface between
+ * the ipmi_smi code (that handles the policy of a KCS, SMIC, or
+ * BT interface) and the actual low-level state machine.
+ *
+ * Author: MontaVista Software, Inc.
+ * Corey Minyard <minyard@mvista.com>
+ * source@mvista.com
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ */
+
+#ifndef __IPMI_SI_SM_H__
+#define __IPMI_SI_SM_H__
+
+#include "ipmi_si.h"
+
+/*
+ * This is defined by the state machines themselves, it is an opaque
+ * data type for them to use.
+ */
+struct si_sm_data;
+
+/* Results of SMI events. */
+enum si_sm_result {
+ SI_SM_CALL_WITHOUT_DELAY, /* Call the driver again immediately */
+ SI_SM_CALL_WITH_DELAY, /* Delay some before calling again. */
+ SI_SM_CALL_WITH_TICK_DELAY,/* Delay >=1 tick before calling again. */
+ SI_SM_TRANSACTION_COMPLETE, /* A transaction is finished. */
+ SI_SM_IDLE, /* The SM is in idle state. */
+ SI_SM_HOSED, /* The hardware violated the state machine. */
+
+ /*
+ * The hardware is asserting attn and the state machine is
+ * idle.
+ */
+ SI_SM_ATTN
+};
+
+/* Handlers for the SMI state machine. */
+struct si_sm_handlers {
+ /*
+ * Put the version number of the state machine here so the
+ * upper layer can print it.
+ */
+ char *version;
+
+ /*
+ * Initialize the data and return the amount of I/O space to
+ * reserve for the space.
+ */
+ unsigned int (*init_data)(struct si_sm_data *smi,
+ struct si_sm_io *io);
+
+ /*
+ * Start a new transaction in the state machine. This will
+ * return -2 if the state machine is not idle, -1 if the size
+ * is invalid (to large or too small), or 0 if the transaction
+ * is successfully completed.
+ */
+ int (*start_transaction)(struct si_sm_data *smi,
+ unsigned char *data, unsigned int size);
+
+ /*
+ * Return the results after the transaction. This will return
+ * -1 if the buffer is too small, zero if no transaction is
+ * present, or the actual length of the result data.
+ */
+ int (*get_result)(struct si_sm_data *smi,
+ unsigned char *data, unsigned int length);
+
+ /*
+ * Call this periodically (for a polled interface) or upon
+ * receiving an interrupt (for a interrupt-driven interface).
+ * If interrupt driven, you should probably poll this
+ * periodically when not in idle state. This should be called
+ * with the time that passed since the last call, if it is
+ * significant. Time is in microseconds.
+ */
+ enum si_sm_result (*event)(struct si_sm_data *smi, long time);
+
+ /*
+ * Attempt to detect an SMI. Returns 0 on success or nonzero
+ * on failure.
+ */
+ int (*detect)(struct si_sm_data *smi);
+
+ /* The interface is shutting down, so clean it up. */
+ void (*cleanup)(struct si_sm_data *smi);
+
+ /* Return the size of the SMI structure in bytes. */
+ int (*size)(void);
+};
+
+/* Current state machines that we can use. */
+extern const struct si_sm_handlers kcs_smi_handlers;
+extern const struct si_sm_handlers smic_smi_handlers;
+extern const struct si_sm_handlers bt_smi_handlers;
+
+#endif /* __IPMI_SI_SM_H__ */