1d70424edSNicolas Souchu /*- 24d846d26SWarner Losh * SPDX-License-Identifier: BSD-2-Clause 3718cf2ccSPedro F. Giffuni * 4c17d4340SNicolas Souchu * Copyright (c) 1998, 2001 Nicolas Souchu 5d70424edSNicolas Souchu * All rights reserved. 6d70424edSNicolas Souchu * 7d70424edSNicolas Souchu * Redistribution and use in source and binary forms, with or without 8d70424edSNicolas Souchu * modification, are permitted provided that the following conditions 9d70424edSNicolas Souchu * are met: 10d70424edSNicolas Souchu * 1. Redistributions of source code must retain the above copyright 11d70424edSNicolas Souchu * notice, this list of conditions and the following disclaimer. 12d70424edSNicolas Souchu * 2. Redistributions in binary form must reproduce the above copyright 13d70424edSNicolas Souchu * notice, this list of conditions and the following disclaimer in the 14d70424edSNicolas Souchu * documentation and/or other materials provided with the distribution. 15d70424edSNicolas Souchu * 16d70424edSNicolas Souchu * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17d70424edSNicolas Souchu * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18d70424edSNicolas Souchu * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19d70424edSNicolas Souchu * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20d70424edSNicolas Souchu * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21d70424edSNicolas Souchu * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22d70424edSNicolas Souchu * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23d70424edSNicolas Souchu * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24d70424edSNicolas Souchu * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25d70424edSNicolas Souchu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26d70424edSNicolas Souchu * SUCH DAMAGE. 27d70424edSNicolas Souchu * 28d70424edSNicolas Souchu * 29d70424edSNicolas Souchu */ 30945ff31aSDavid E. O'Brien 31945ff31aSDavid E. O'Brien #include <sys/cdefs.h> 32945ff31aSDavid E. O'Brien __FBSDID("$FreeBSD$"); 33d70424edSNicolas Souchu #include <sys/param.h> 34d70424edSNicolas Souchu #include <sys/systm.h> 357048a99cSJohn Baldwin #include <sys/lock.h> 36d70424edSNicolas Souchu #include <sys/module.h> 377048a99cSJohn Baldwin #include <sys/mutex.h> 38d70424edSNicolas Souchu #include <sys/bus.h> 39d70424edSNicolas Souchu 40d70424edSNicolas Souchu #include <dev/smbus/smbconf.h> 41d70424edSNicolas Souchu #include <dev/smbus/smbus.h> 42d70424edSNicolas Souchu #include "smbus_if.h" 43d70424edSNicolas Souchu 44d70424edSNicolas Souchu /* 45d70424edSNicolas Souchu * smbus_intr() 46d70424edSNicolas Souchu */ 47d70424edSNicolas Souchu void 48d70424edSNicolas Souchu smbus_intr(device_t bus, u_char devaddr, char low, char high, int error) 49d70424edSNicolas Souchu { 507048a99cSJohn Baldwin struct smbus_softc *sc = device_get_softc(bus); 51d70424edSNicolas Souchu 52d70424edSNicolas Souchu /* call owner's intr routine */ 537048a99cSJohn Baldwin mtx_lock(&sc->lock); 54d70424edSNicolas Souchu if (sc->owner) 55d70424edSNicolas Souchu SMBUS_INTR(sc->owner, devaddr, low, high, error); 567048a99cSJohn Baldwin mtx_unlock(&sc->lock); 57d70424edSNicolas Souchu } 58d70424edSNicolas Souchu 59d70424edSNicolas Souchu /* 604012f363SNicolas Souchu * smbus_error() 614012f363SNicolas Souchu * 624012f363SNicolas Souchu * Converts an smbus error to a unix error. 634012f363SNicolas Souchu */ 644012f363SNicolas Souchu int 654012f363SNicolas Souchu smbus_error(int smb_error) 664012f363SNicolas Souchu { 674012f363SNicolas Souchu int error = 0; 684012f363SNicolas Souchu 694012f363SNicolas Souchu if (smb_error == SMB_ENOERR) 704012f363SNicolas Souchu return (0); 714012f363SNicolas Souchu 727048a99cSJohn Baldwin if (smb_error & (SMB_ENOTSUPP)) 734012f363SNicolas Souchu error = ENODEV; 747048a99cSJohn Baldwin else if (smb_error & (SMB_ENOACK)) 754012f363SNicolas Souchu error = ENXIO; 767048a99cSJohn Baldwin else if (smb_error & (SMB_ETIMEOUT)) 774012f363SNicolas Souchu error = EWOULDBLOCK; 787048a99cSJohn Baldwin else if (smb_error & (SMB_EBUSY)) 794012f363SNicolas Souchu error = EBUSY; 807048a99cSJohn Baldwin else if (smb_error & (SMB_EABORT | SMB_EBUSERR | SMB_ECOLLI)) 817048a99cSJohn Baldwin error = EIO; 827048a99cSJohn Baldwin else 834012f363SNicolas Souchu error = EINVAL; 844012f363SNicolas Souchu 854012f363SNicolas Souchu return (error); 864012f363SNicolas Souchu } 874012f363SNicolas Souchu 883ab1f056SNicolas Souchu static int 893ab1f056SNicolas Souchu smbus_poll(struct smbus_softc *sc, int how) 90d70424edSNicolas Souchu { 913ab1f056SNicolas Souchu int error; 92d70424edSNicolas Souchu 93d70424edSNicolas Souchu switch (how) { 947048a99cSJohn Baldwin case SMB_WAIT | SMB_INTR: 957048a99cSJohn Baldwin error = msleep(sc, &sc->lock, SMBPRI|PCATCH, "smbreq", 0); 96d70424edSNicolas Souchu break; 97d70424edSNicolas Souchu 987048a99cSJohn Baldwin case SMB_WAIT | SMB_NOINTR: 997048a99cSJohn Baldwin error = msleep(sc, &sc->lock, SMBPRI, "smbreq", 0); 100d70424edSNicolas Souchu break; 101d70424edSNicolas Souchu 102d70424edSNicolas Souchu default: 1037048a99cSJohn Baldwin error = EWOULDBLOCK; 104d70424edSNicolas Souchu break; 105d70424edSNicolas Souchu } 106d70424edSNicolas Souchu 1073ab1f056SNicolas Souchu return (error); 1083ab1f056SNicolas Souchu } 1093ab1f056SNicolas Souchu 1103ab1f056SNicolas Souchu /* 1113ab1f056SNicolas Souchu * smbus_request_bus() 1123ab1f056SNicolas Souchu * 1133ab1f056SNicolas Souchu * Allocate the device to perform transfers. 1143ab1f056SNicolas Souchu * 1153ab1f056SNicolas Souchu * how : SMB_WAIT or SMB_DONTWAIT 1163ab1f056SNicolas Souchu */ 1173ab1f056SNicolas Souchu int 1183ab1f056SNicolas Souchu smbus_request_bus(device_t bus, device_t dev, int how) 1193ab1f056SNicolas Souchu { 1207048a99cSJohn Baldwin struct smbus_softc *sc = device_get_softc(bus); 1217048a99cSJohn Baldwin device_t parent; 1227048a99cSJohn Baldwin int error; 1233ab1f056SNicolas Souchu 1243ab1f056SNicolas Souchu /* first, ask the underlying layers if the request is ok */ 1257048a99cSJohn Baldwin parent = device_get_parent(bus); 1267048a99cSJohn Baldwin mtx_lock(&sc->lock); 1277a191714SNicolas Souchu do { 1287048a99cSJohn Baldwin mtx_unlock(&sc->lock); 1297048a99cSJohn Baldwin error = SMBUS_CALLBACK(parent, SMB_REQUEST_BUS, &how); 1307048a99cSJohn Baldwin mtx_lock(&sc->lock); 1317048a99cSJohn Baldwin 1327a191714SNicolas Souchu if (error) 1337a191714SNicolas Souchu error = smbus_poll(sc, how); 1347a191714SNicolas Souchu } while (error == EWOULDBLOCK); 1353ab1f056SNicolas Souchu 1367048a99cSJohn Baldwin while (error == 0) { 1377048a99cSJohn Baldwin if (sc->owner && sc->owner != dev) 1383ab1f056SNicolas Souchu error = smbus_poll(sc, how); 1397048a99cSJohn Baldwin else { 140d70424edSNicolas Souchu sc->owner = dev; 1417048a99cSJohn Baldwin break; 142d70424edSNicolas Souchu } 143ba81c311SNicolas Souchu 144ba81c311SNicolas Souchu /* free any allocated resource */ 1457048a99cSJohn Baldwin if (error) { 1467048a99cSJohn Baldwin mtx_unlock(&sc->lock); 1477048a99cSJohn Baldwin SMBUS_CALLBACK(parent, SMB_RELEASE_BUS, &how); 1487048a99cSJohn Baldwin return (error); 149d70424edSNicolas Souchu } 1507048a99cSJohn Baldwin } 1517048a99cSJohn Baldwin mtx_unlock(&sc->lock); 152d70424edSNicolas Souchu 153d70424edSNicolas Souchu return (error); 154d70424edSNicolas Souchu } 155d70424edSNicolas Souchu 156d70424edSNicolas Souchu /* 157d70424edSNicolas Souchu * smbus_release_bus() 158d70424edSNicolas Souchu * 159d70424edSNicolas Souchu * Release the device allocated with smbus_request_dev() 160d70424edSNicolas Souchu */ 161d70424edSNicolas Souchu int 162d70424edSNicolas Souchu smbus_release_bus(device_t bus, device_t dev) 163d70424edSNicolas Souchu { 1647048a99cSJohn Baldwin struct smbus_softc *sc = device_get_softc(bus); 1657048a99cSJohn Baldwin int error; 1663ab1f056SNicolas Souchu 1673ab1f056SNicolas Souchu /* first, ask the underlying layers if the release is ok */ 1683ab1f056SNicolas Souchu error = SMBUS_CALLBACK(device_get_parent(bus), SMB_RELEASE_BUS, NULL); 1693ab1f056SNicolas Souchu 1703ab1f056SNicolas Souchu if (error) 1713ab1f056SNicolas Souchu return (error); 172d70424edSNicolas Souchu 1737048a99cSJohn Baldwin mtx_lock(&sc->lock); 1747048a99cSJohn Baldwin if (sc->owner == dev) { 1757048a99cSJohn Baldwin sc->owner = NULL; 176d70424edSNicolas Souchu 177d70424edSNicolas Souchu /* wakeup waiting processes */ 178d70424edSNicolas Souchu wakeup(sc); 1797048a99cSJohn Baldwin } else 1807048a99cSJohn Baldwin error = EACCES; 1817048a99cSJohn Baldwin mtx_unlock(&sc->lock); 182d70424edSNicolas Souchu 1837048a99cSJohn Baldwin return (error); 184d70424edSNicolas Souchu } 185