185 lines
4.2 KiB
C
185 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1998, 2001 Nicolas Souchu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <dev/smbus/smbconf.h>
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#include <dev/smbus/smbus.h>
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#include "smbus_if.h"
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/*
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* smbus_intr()
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*/
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void
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smbus_intr(device_t bus, u_char devaddr, char low, char high, int error)
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{
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struct smbus_softc *sc = device_get_softc(bus);
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/* call owner's intr routine */
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mtx_lock(&sc->lock);
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if (sc->owner)
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SMBUS_INTR(sc->owner, devaddr, low, high, error);
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mtx_unlock(&sc->lock);
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}
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/*
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* smbus_error()
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*
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* Converts an smbus error to a unix error.
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*/
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int
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smbus_error(int smb_error)
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{
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int error = 0;
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if (smb_error == SMB_ENOERR)
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return (0);
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if (smb_error & (SMB_ENOTSUPP))
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error = ENODEV;
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else if (smb_error & (SMB_ENOACK))
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error = ENXIO;
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else if (smb_error & (SMB_ETIMEOUT))
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error = EWOULDBLOCK;
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else if (smb_error & (SMB_EBUSY))
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error = EBUSY;
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else if (smb_error & (SMB_EABORT | SMB_EBUSERR | SMB_ECOLLI))
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error = EIO;
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else
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error = EINVAL;
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return (error);
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}
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static int
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smbus_poll(struct smbus_softc *sc, int how)
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{
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int error;
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switch (how) {
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case SMB_WAIT | SMB_INTR:
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error = msleep(sc, &sc->lock, SMBPRI|PCATCH, "smbreq", 0);
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break;
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case SMB_WAIT | SMB_NOINTR:
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error = msleep(sc, &sc->lock, SMBPRI, "smbreq", 0);
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break;
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default:
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error = EWOULDBLOCK;
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break;
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}
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return (error);
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}
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/*
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* smbus_request_bus()
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*
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* Allocate the device to perform transfers.
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*
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* how : SMB_WAIT or SMB_DONTWAIT
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*/
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int
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smbus_request_bus(device_t bus, device_t dev, int how)
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{
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struct smbus_softc *sc = device_get_softc(bus);
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device_t parent;
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int error;
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/* first, ask the underlying layers if the request is ok */
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parent = device_get_parent(bus);
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mtx_lock(&sc->lock);
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do {
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mtx_unlock(&sc->lock);
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error = SMBUS_CALLBACK(parent, SMB_REQUEST_BUS, &how);
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mtx_lock(&sc->lock);
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if (error)
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error = smbus_poll(sc, how);
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} while (error == EWOULDBLOCK);
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while (error == 0) {
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if (sc->owner && sc->owner != dev)
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error = smbus_poll(sc, how);
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else {
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sc->owner = dev;
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break;
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}
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/* free any allocated resource */
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if (error) {
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mtx_unlock(&sc->lock);
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SMBUS_CALLBACK(parent, SMB_RELEASE_BUS, &how);
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return (error);
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}
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}
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mtx_unlock(&sc->lock);
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return (error);
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}
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/*
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* smbus_release_bus()
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*
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* Release the device allocated with smbus_request_dev()
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*/
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int
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smbus_release_bus(device_t bus, device_t dev)
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{
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struct smbus_softc *sc = device_get_softc(bus);
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int error;
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/* first, ask the underlying layers if the release is ok */
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error = SMBUS_CALLBACK(device_get_parent(bus), SMB_RELEASE_BUS, NULL);
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if (error)
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return (error);
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mtx_lock(&sc->lock);
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if (sc->owner == dev) {
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sc->owner = NULL;
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/* wakeup waiting processes */
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wakeup(sc);
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} else
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error = EACCES;
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mtx_unlock(&sc->lock);
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return (error);
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}
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