1 /*- 2 * Copyright (c) 1998, 2001 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 * $FreeBSD$ 27 * 28 */ 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/systm.h> 32 #include <sys/module.h> 33 #include <sys/bus.h> 34 #include <sys/conf.h> 35 #include <sys/uio.h> 36 #include <sys/fcntl.h> 37 38 #include <dev/smbus/smbconf.h> 39 #include <dev/smbus/smbus.h> 40 #include <dev/smbus/smb.h> 41 42 #include "smbus_if.h" 43 44 #define BUFSIZE 1024 45 46 struct smb_softc { 47 48 int sc_count; /* >0 if device opened */ 49 dev_t sc_devnode; 50 }; 51 52 #define IIC_SOFTC(unit) \ 53 ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit))) 54 55 #define IIC_DEVICE(unit) \ 56 (devclass_get_device(smb_devclass, (unit))) 57 58 static int smb_probe(device_t); 59 static int smb_attach(device_t); 60 static int smb_detach(device_t); 61 static void smb_identify(driver_t *driver, device_t parent); 62 63 static devclass_t smb_devclass; 64 65 static device_method_t smb_methods[] = { 66 /* device interface */ 67 DEVMETHOD(device_identify, smb_identify), 68 DEVMETHOD(device_probe, smb_probe), 69 DEVMETHOD(device_attach, smb_attach), 70 DEVMETHOD(device_detach, smb_detach), 71 72 /* smbus interface */ 73 DEVMETHOD(smbus_intr, smbus_generic_intr), 74 75 { 0, 0 } 76 }; 77 78 static driver_t smb_driver = { 79 "smb", 80 smb_methods, 81 sizeof(struct smb_softc), 82 }; 83 84 static d_open_t smbopen; 85 static d_close_t smbclose; 86 static d_write_t smbwrite; 87 static d_read_t smbread; 88 static d_ioctl_t smbioctl; 89 90 #define CDEV_MAJOR 106 91 static struct cdevsw smb_cdevsw = { 92 /* open */ smbopen, 93 /* close */ smbclose, 94 /* read */ smbread, 95 /* write */ smbwrite, 96 /* ioctl */ smbioctl, 97 /* poll */ nopoll, 98 /* mmap */ nommap, 99 /* strategy */ nostrategy, 100 /* name */ "smb", 101 /* maj */ CDEV_MAJOR, 102 /* dump */ nodump, 103 /* psize */ nopsize, 104 /* flags */ 0, 105 }; 106 107 static void 108 smb_identify(driver_t *driver, device_t parent) 109 { 110 BUS_ADD_CHILD(parent, 0, "smb", 0); 111 } 112 113 static int 114 smb_probe(device_t dev) 115 { 116 device_set_desc(dev, "SMBus generic I/O"); 117 118 return (0); 119 } 120 121 static int 122 smb_attach(device_t dev) 123 { 124 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 125 126 if (!sc) 127 return (ENOMEM); 128 129 bzero(sc, sizeof(struct smb_softc *)); 130 131 sc->sc_devnode = make_dev(&smb_cdevsw, device_get_unit(dev), 132 UID_ROOT, GID_WHEEL, 133 0600, "smb%d", device_get_unit(dev)); 134 135 return (0); 136 } 137 138 static int 139 smb_detach(device_t dev) 140 { 141 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 142 143 if (sc->sc_devnode) 144 destroy_dev(sc->sc_devnode); 145 146 return (0); 147 } 148 149 static int 150 smbopen (dev_t dev, int flags, int fmt, struct thread *td) 151 { 152 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 153 154 if (!sc) 155 return (EINVAL); 156 157 if (sc->sc_count) 158 return (EBUSY); 159 160 sc->sc_count++; 161 162 return (0); 163 } 164 165 static int 166 smbclose(dev_t dev, int flags, int fmt, struct thread *td) 167 { 168 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 169 170 if (!sc) 171 return (EINVAL); 172 173 if (!sc->sc_count) 174 return (EINVAL); 175 176 sc->sc_count--; 177 178 return (0); 179 } 180 181 static int 182 smbwrite(dev_t dev, struct uio * uio, int ioflag) 183 { 184 /* not supported */ 185 186 return (EINVAL); 187 } 188 189 static int 190 smbread(dev_t dev, struct uio * uio, int ioflag) 191 { 192 /* not supported */ 193 194 return (EINVAL); 195 } 196 197 static int 198 smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 199 { 200 device_t smbdev = IIC_DEVICE(minor(dev)); 201 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 202 device_t parent = device_get_parent(smbdev); 203 204 int error = 0; 205 struct smbcmd *s = (struct smbcmd *)data; 206 207 if (!sc || !s) 208 return (EINVAL); 209 210 /* allocate the bus */ 211 if ((error = smbus_request_bus(parent, smbdev, 212 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) 213 return (error); 214 215 switch (cmd) { 216 case SMB_QUICK_WRITE: 217 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); 218 break; 219 220 case SMB_QUICK_READ: 221 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); 222 break; 223 224 case SMB_SENDB: 225 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); 226 break; 227 228 case SMB_RECVB: 229 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); 230 break; 231 232 case SMB_WRITEB: 233 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, 234 s->data.byte)); 235 break; 236 237 case SMB_WRITEW: 238 error = smbus_error(smbus_writew(parent, s->slave, 239 s->cmd, s->data.word)); 240 break; 241 242 case SMB_READB: 243 if (s->data.byte_ptr) 244 error = smbus_error(smbus_readb(parent, s->slave, 245 s->cmd, s->data.byte_ptr)); 246 break; 247 248 case SMB_READW: 249 if (s->data.word_ptr) 250 error = smbus_error(smbus_readw(parent, s->slave, 251 s->cmd, s->data.word_ptr)); 252 break; 253 254 case SMB_PCALL: 255 if (s->data.process.rdata) 256 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, 257 s->data.process.sdata, s->data.process.rdata)); 258 break; 259 260 case SMB_BWRITE: 261 if (s->count && s->data.byte_ptr) 262 error = smbus_error(smbus_bwrite(parent, s->slave, 263 s->cmd, s->count, s->data.byte_ptr)); 264 break; 265 266 case SMB_BREAD: 267 if (s->count && s->data.byte_ptr) 268 error = smbus_error(smbus_bread(parent, s->slave, 269 s->cmd, s->count, s->data.byte_ptr)); 270 break; 271 272 default: 273 error = ENODEV; 274 } 275 276 /* release the bus */ 277 smbus_release_bus(parent, smbdev); 278 279 return (error); 280 } 281 282 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0); 283 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER); 284 MODULE_VERSION(smb, 1); 285