1 /*- 2 * Copyright (c) 1998 Nicolas Souchu 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 * 26 * $Id: smbconf.c,v 1.1.1.2 1998/08/13 15:16:57 son Exp $ 27 * 28 */ 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/malloc.h> 33 #include <sys/module.h> 34 #include <sys/bus.h> 35 36 #include <dev/smbus/smbconf.h> 37 #include <dev/smbus/smbus.h> 38 #include "smbus_if.h" 39 40 /* 41 * smbus_intr() 42 */ 43 void 44 smbus_intr(device_t bus, u_char devaddr, char low, char high, int error) 45 { 46 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 47 48 /* call owner's intr routine */ 49 if (sc->owner) 50 SMBUS_INTR(sc->owner, devaddr, low, high, error); 51 52 return; 53 } 54 55 /* 56 * smbus_alloc_bus() 57 * 58 * Allocate a new bus connected to the given parent device 59 */ 60 device_t 61 smbus_alloc_bus(device_t parent) 62 { 63 device_t child; 64 65 /* add the bus to the parent */ 66 child = device_add_child(parent, "smbus", -1, NULL); 67 68 if (child) 69 device_set_desc(child, "System Management Bus"); 70 71 return (child); 72 } 73 74 /* 75 * smbus_request_bus() 76 * 77 * Allocate the device to perform transfers. 78 * 79 * how : SMB_WAIT or SMB_DONTWAIT 80 */ 81 int 82 smbus_request_bus(device_t bus, device_t dev, int how) 83 { 84 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 85 int s, error = 0; 86 87 while (!error) { 88 s = splhigh(); 89 if (sc->owner) { 90 splx(s); 91 92 switch (how) { 93 case (SMB_WAIT | SMB_INTR): 94 error = tsleep(sc, SMBPRI|PCATCH, "smbreq", 0); 95 break; 96 97 case (SMB_WAIT | SMB_NOINTR): 98 error = tsleep(sc, SMBPRI, "smbreq", 0); 99 break; 100 101 default: 102 return (EWOULDBLOCK); 103 break; 104 } 105 106 } else { 107 sc->owner = dev; 108 109 splx(s); 110 return (0); 111 } 112 } 113 114 return (error); 115 } 116 117 /* 118 * smbus_release_bus() 119 * 120 * Release the device allocated with smbus_request_dev() 121 */ 122 int 123 smbus_release_bus(device_t bus, device_t dev) 124 { 125 struct smbus_softc *sc = (struct smbus_softc *)device_get_softc(bus); 126 int s; 127 128 s = splhigh(); 129 if (sc->owner != dev) { 130 splx(s); 131 return (EACCES); 132 } 133 134 sc->owner = 0; 135 splx(s); 136 137 /* wakeup waiting processes */ 138 wakeup(sc); 139 140 return (0); 141 } 142 143 /* 144 * smbus_get_addr() 145 * 146 * Get the I2C 7 bits address of the device 147 */ 148 u_char 149 smbus_get_addr(device_t dev) 150 { 151 u_long addr; 152 device_t parent = device_get_parent(dev); 153 154 BUS_READ_IVAR(parent, dev, SMBUS_IVAR_ADDR, &addr); 155 156 return ((u_char)addr); 157 } 158