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hil_mlc.h
/* * HP Human Interface Loop Master Link Controller driver. * * Copyright (c) 2001 Brian S. Julin * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL"). * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * * References: * HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A * */ #include <linux/hil.h> #include <linux/time.h> #include <linux/interrupt.h> #include <linux/semaphore.h> #include <linux/serio.h> #include <linux/list.h> typedef struct hil_mlc hil_mlc; /* The HIL has a complicated state engine. * We define the structure of nodes in the state engine here. */ enum hilse_act { /* HILSE_OUT prepares to receive input if the next node * is an IN or EXPECT, and then sends the given packet. */ HILSE_OUT = 0, /* HILSE_CTS checks if the loop is busy. */ HILSE_CTS, /* HILSE_OUT_LAST sends the given command packet to * the last configured/running device on the loop. */ HILSE_OUT_LAST, /* HILSE_OUT_DISC sends the given command packet to * the next device past the last configured/running one. */ HILSE_OUT_DISC, /* HILSE_FUNC runs a callback function with given arguments. * a positive return value causes the "ugly" branch to be taken. */ HILSE_FUNC, /* HILSE_IN simply expects any non-errored packet to arrive * within arg usecs. */ HILSE_IN = 0x100, /* HILSE_EXPECT expects a particular packet to arrive * within arg usecs, any other packet is considered an error. */ HILSE_EXPECT, /* HILSE_EXPECT_LAST as above but dev field should be last * discovered/operational device. */ HILSE_EXPECT_LAST, /* HILSE_EXPECT_LAST as above but dev field should be first * undiscovered/inoperational device. */ HILSE_EXPECT_DISC }; typedef int (hilse_func) (hil_mlc *mlc, int arg); struct hilse_node { enum hilse_act act; /* How to process this node */ union { hilse_func *func; /* Function to call if HILSE_FUNC */ hil_packet packet; /* Packet to send or to compare */ } object; int arg; /* Timeout in usec or parm for func */ int good; /* Node to jump to on success */ int bad; /* Node to jump to on error */ int ugly; /* Node to jump to on timeout */ }; /* Methods for back-end drivers, e.g. hp_sdc_mlc */ typedef int (hil_mlc_cts) (hil_mlc *mlc); typedef int (hil_mlc_out) (hil_mlc *mlc); typedef int (hil_mlc_in) (hil_mlc *mlc, suseconds_t timeout); struct hil_mlc_devinfo { uint8_t idd[16]; /* Device ID Byte and Describe Record */ uint8_t rsc[16]; /* Security Code Header and Record */ uint8_t exd[16]; /* Extended Describe Record */ uint8_t rnm[16]; /* Device name as returned by RNM command */ }; struct hil_mlc_serio_map { hil_mlc *mlc; int di_revmap; int didx; }; /* How many (possibly old/detached) devices the we try to keep track of */ #define HIL_MLC_DEVMEM 16 struct hil_mlc { struct list_head list; /* hil_mlc is organized as linked list */ rwlock_t lock; void *priv; /* Data specific to a particular type of MLC */ int seidx; /* Current node in state engine */ int istarted, ostarted; hil_mlc_cts *cts; struct semaphore csem; /* Raised when loop idle */ hil_mlc_out *out; struct semaphore osem; /* Raised when outpacket dispatched */ hil_packet opacket; hil_mlc_in *in; struct semaphore isem; /* Raised when a packet arrives */ hil_packet ipacket[16]; hil_packet imatch; int icount; unsigned long instart; unsigned long intimeout; int ddi; /* Last operational device id */ int lcv; /* LCV to throttle loops */ time64_t lcv_time; /* Time loop was started */ int di_map[7]; /* Maps below items to live devs */ struct hil_mlc_devinfo di[HIL_MLC_DEVMEM]; struct serio *serio[HIL_MLC_DEVMEM]; struct hil_mlc_serio_map serio_map[HIL_MLC_DEVMEM]; hil_packet serio_opacket[HIL_MLC_DEVMEM]; int serio_oidx[HIL_MLC_DEVMEM]; struct hil_mlc_devinfo di_scratch; /* Temporary area */ int opercnt; struct tasklet_struct *tasklet; }; int hil_mlc_register(hil_mlc *mlc); int hil_mlc_unregister(hil_mlc *mlc);
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