1/*-
| 1/*-
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2 * Copyright (c) 1998 Nicolas Souchu
| 2 * Copyright (c) 1998, 2001 Nicolas Souchu
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3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 *
| 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 *
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26 * $FreeBSD: head/sys/dev/smbus/smbconf.c 59760 2000-04-29 15:36:14Z phk $
| 26 * $FreeBSD: head/sys/dev/smbus/smbconf.c 93023 2002-03-23 15:49:15Z nsouch $
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27 * 28 */ 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/module.h> 32#include <sys/bus.h> 33 34#include <dev/smbus/smbconf.h> 35#include <dev/smbus/smbus.h> 36#include "smbus_if.h" 37 38/* 39 * smbus_intr() 40 */ 41void 42smbus_intr(device_t bus, u_char devaddr, char low, char high, int error) 43{ 44 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 45 46 /* call owner's intr routine */ 47 if (sc->owner) 48 SMBUS_INTR(sc->owner, devaddr, low, high, error); 49 50 return; 51} 52 53/* 54 * smbus_error() 55 * 56 * Converts an smbus error to a unix error. 57 */ 58int 59smbus_error(int smb_error) 60{ 61 int error = 0; 62 63 if (smb_error == SMB_ENOERR) 64 return (0); 65 66 if (smb_error & (SMB_ENOTSUPP)) { 67 error = ENODEV; 68 } else if (smb_error & (SMB_ENOACK)) { 69 error = ENXIO; 70 } else if (smb_error & (SMB_ETIMEOUT)) { 71 error = EWOULDBLOCK; 72 } else if (smb_error & (SMB_EBUSY)) { 73 error = EBUSY; 74 } else { 75 error = EINVAL; 76 } 77 78 return (error); 79} 80
| 27 * 28 */ 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/module.h> 32#include <sys/bus.h> 33 34#include <dev/smbus/smbconf.h> 35#include <dev/smbus/smbus.h> 36#include "smbus_if.h" 37 38/* 39 * smbus_intr() 40 */ 41void 42smbus_intr(device_t bus, u_char devaddr, char low, char high, int error) 43{ 44 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 45 46 /* call owner's intr routine */ 47 if (sc->owner) 48 SMBUS_INTR(sc->owner, devaddr, low, high, error); 49 50 return; 51} 52 53/* 54 * smbus_error() 55 * 56 * Converts an smbus error to a unix error. 57 */ 58int 59smbus_error(int smb_error) 60{ 61 int error = 0; 62 63 if (smb_error == SMB_ENOERR) 64 return (0); 65 66 if (smb_error & (SMB_ENOTSUPP)) { 67 error = ENODEV; 68 } else if (smb_error & (SMB_ENOACK)) { 69 error = ENXIO; 70 } else if (smb_error & (SMB_ETIMEOUT)) { 71 error = EWOULDBLOCK; 72 } else if (smb_error & (SMB_EBUSY)) { 73 error = EBUSY; 74 } else { 75 error = EINVAL; 76 } 77 78 return (error); 79} 80
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81/* 82 * smbus_alloc_bus() 83 * 84 * Allocate a new bus connected to the given parent device 85 */ 86device_t 87smbus_alloc_bus(device_t parent) 88{ 89 device_t child; 90 91 /* add the bus to the parent */ 92 child = device_add_child(parent, "smbus", -1); 93 94 return (child); 95} 96
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97static int 98smbus_poll(struct smbus_softc *sc, int how) 99{ 100 int error; 101 102 switch (how) { 103 case (SMB_WAIT | SMB_INTR): 104 error = tsleep(sc, SMBPRI|PCATCH, "smbreq", 0); 105 break; 106 107 case (SMB_WAIT | SMB_NOINTR): 108 error = tsleep(sc, SMBPRI, "smbreq", 0); 109 break; 110 111 default: 112 return (EWOULDBLOCK); 113 break; 114 } 115 116 return (error); 117} 118 119/* 120 * smbus_request_bus() 121 * 122 * Allocate the device to perform transfers. 123 * 124 * how : SMB_WAIT or SMB_DONTWAIT 125 */ 126int 127smbus_request_bus(device_t bus, device_t dev, int how) 128{ 129 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 130 int s, error = 0; 131 132 /* first, ask the underlying layers if the request is ok */ 133 do { 134 error = SMBUS_CALLBACK(device_get_parent(bus), 135 SMB_REQUEST_BUS, (caddr_t)&how); 136 if (error) 137 error = smbus_poll(sc, how); 138 } while (error == EWOULDBLOCK); 139 140 while (!error) { 141 s = splhigh(); 142 if (sc->owner && sc->owner != dev) { 143 splx(s); 144 145 error = smbus_poll(sc, how); 146 } else { 147 sc->owner = dev; 148 149 splx(s); 150 return (0); 151 } 152 153 /* free any allocated resource */ 154 if (error) 155 SMBUS_CALLBACK(device_get_parent(bus), SMB_RELEASE_BUS, 156 (caddr_t)&how); 157 } 158 159 return (error); 160} 161 162/* 163 * smbus_release_bus() 164 * 165 * Release the device allocated with smbus_request_dev() 166 */ 167int 168smbus_release_bus(device_t bus, device_t dev) 169{ 170 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 171 int s, error; 172 173 /* first, ask the underlying layers if the release is ok */ 174 error = SMBUS_CALLBACK(device_get_parent(bus), SMB_RELEASE_BUS, NULL); 175 176 if (error) 177 return (error); 178 179 s = splhigh(); 180 if (sc->owner != dev) { 181 splx(s); 182 return (EACCES); 183 } 184 185 sc->owner = 0; 186 splx(s); 187 188 /* wakeup waiting processes */ 189 wakeup(sc); 190 191 return (0); 192}
| 81static int 82smbus_poll(struct smbus_softc *sc, int how) 83{ 84 int error; 85 86 switch (how) { 87 case (SMB_WAIT | SMB_INTR): 88 error = tsleep(sc, SMBPRI|PCATCH, "smbreq", 0); 89 break; 90 91 case (SMB_WAIT | SMB_NOINTR): 92 error = tsleep(sc, SMBPRI, "smbreq", 0); 93 break; 94 95 default: 96 return (EWOULDBLOCK); 97 break; 98 } 99 100 return (error); 101} 102 103/* 104 * smbus_request_bus() 105 * 106 * Allocate the device to perform transfers. 107 * 108 * how : SMB_WAIT or SMB_DONTWAIT 109 */ 110int 111smbus_request_bus(device_t bus, device_t dev, int how) 112{ 113 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 114 int s, error = 0; 115 116 /* first, ask the underlying layers if the request is ok */ 117 do { 118 error = SMBUS_CALLBACK(device_get_parent(bus), 119 SMB_REQUEST_BUS, (caddr_t)&how); 120 if (error) 121 error = smbus_poll(sc, how); 122 } while (error == EWOULDBLOCK); 123 124 while (!error) { 125 s = splhigh(); 126 if (sc->owner && sc->owner != dev) { 127 splx(s); 128 129 error = smbus_poll(sc, how); 130 } else { 131 sc->owner = dev; 132 133 splx(s); 134 return (0); 135 } 136 137 /* free any allocated resource */ 138 if (error) 139 SMBUS_CALLBACK(device_get_parent(bus), SMB_RELEASE_BUS, 140 (caddr_t)&how); 141 } 142 143 return (error); 144} 145 146/* 147 * smbus_release_bus() 148 * 149 * Release the device allocated with smbus_request_dev() 150 */ 151int 152smbus_release_bus(device_t bus, device_t dev) 153{ 154 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 155 int s, error; 156 157 /* first, ask the underlying layers if the release is ok */ 158 error = SMBUS_CALLBACK(device_get_parent(bus), SMB_RELEASE_BUS, NULL); 159 160 if (error) 161 return (error); 162 163 s = splhigh(); 164 if (sc->owner != dev) { 165 splx(s); 166 return (EACCES); 167 } 168 169 sc->owner = 0; 170 splx(s); 171 172 /* wakeup waiting processes */ 173 wakeup(sc); 174 175 return (0); 176}
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193 194/* 195 * smbus_get_addr() 196 * 197 * Get the I2C 7 bits address of the device 198 */ 199u_char 200smbus_get_addr(device_t dev) 201{ 202 uintptr_t addr; 203 device_t parent = device_get_parent(dev); 204 205 BUS_READ_IVAR(parent, dev, SMBUS_IVAR_ADDR, &addr); 206 207 return ((u_char)addr); 208}
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