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 #ifdef HAVE_KERNEL_OPTION_HEADERS 30 #include "opt_compat.h" 31 #endif 32 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/systm.h> 36 #include <sys/module.h> 37 #include <sys/bus.h> 38 #include <sys/conf.h> 39 #include <sys/uio.h> 40 #include <sys/fcntl.h> 41 42 #include <dev/smbus/smbconf.h> 43 #include <dev/smbus/smbus.h> 44 #include <dev/smbus/smb.h> 45 46 #include "smbus_if.h" 47 48 #define BUFSIZE 1024 49 50 struct smb_softc { 51 52 int sc_count; /* >0 if device opened */ 53 struct cdev *sc_devnode; 54 }; 55 56 #define IIC_SOFTC(unit) \ 57 ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit))) 58 59 #define IIC_DEVICE(unit) \ 60 (devclass_get_device(smb_devclass, (unit))) 61 62 static void smb_identify(driver_t *driver, device_t parent); 63 static int smb_probe(device_t); 64 static int smb_attach(device_t); 65 static int smb_detach(device_t); 66 67 static devclass_t smb_devclass; 68 69 static device_method_t smb_methods[] = { 70 /* device interface */ 71 DEVMETHOD(device_identify, smb_identify), 72 DEVMETHOD(device_probe, smb_probe), 73 DEVMETHOD(device_attach, smb_attach), 74 DEVMETHOD(device_detach, smb_detach), 75 76 /* smbus interface */ 77 DEVMETHOD(smbus_intr, smbus_generic_intr), 78 79 { 0, 0 } 80 }; 81 82 static driver_t smb_driver = { 83 "smb", 84 smb_methods, 85 sizeof(struct smb_softc), 86 }; 87 88 static d_open_t smbopen; 89 static d_close_t smbclose; 90 static d_ioctl_t smbioctl; 91 92 static struct cdevsw smb_cdevsw = { 93 .d_version = D_VERSION, 94 .d_flags = D_NEEDGIANT, 95 .d_open = smbopen, 96 .d_close = smbclose, 97 .d_ioctl = smbioctl, 98 .d_name = "smb", 99 }; 100 101 static void 102 smb_identify(driver_t *driver, device_t parent) 103 { 104 105 if (device_find_child(parent, "smb", -1) == NULL) 106 BUS_ADD_CHILD(parent, 0, "smb", -1); 107 } 108 109 static int 110 smb_probe(device_t dev) 111 { 112 device_set_desc(dev, "SMBus generic I/O"); 113 114 return (0); 115 } 116 117 static int 118 smb_attach(device_t dev) 119 { 120 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 121 122 if (!sc) 123 return (ENOMEM); 124 125 bzero(sc, sizeof(struct smb_softc *)); 126 127 sc->sc_devnode = make_dev(&smb_cdevsw, device_get_unit(dev), 128 UID_ROOT, GID_WHEEL, 129 0600, "smb%d", device_get_unit(dev)); 130 131 return (0); 132 } 133 134 static int 135 smb_detach(device_t dev) 136 { 137 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 138 139 if (sc->sc_devnode) 140 destroy_dev(sc->sc_devnode); 141 142 return (0); 143 } 144 145 static int 146 smbopen (struct cdev *dev, int flags, int fmt, struct thread *td) 147 { 148 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 149 150 if (sc == NULL) 151 return (ENXIO); 152 153 if (sc->sc_count != 0) 154 return (EBUSY); 155 156 sc->sc_count++; 157 158 return (0); 159 } 160 161 static int 162 smbclose(struct cdev *dev, int flags, int fmt, struct thread *td) 163 { 164 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 165 166 if (sc == NULL) 167 return (ENXIO); 168 169 if (sc->sc_count == 0) 170 /* This is not supposed to happen. */ 171 return (0); 172 173 sc->sc_count--; 174 175 return (0); 176 } 177 178 static int 179 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 180 { 181 char buf[SMB_MAXBLOCKSIZE]; 182 device_t parent; 183 struct smbcmd *s = (struct smbcmd *)data; 184 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 185 device_t smbdev = IIC_DEVICE(minor(dev)); 186 int error; 187 short w; 188 u_char count; 189 char c; 190 191 if (sc == NULL) 192 return (ENXIO); 193 if (s == NULL) 194 return (EINVAL); 195 196 parent = device_get_parent(smbdev); 197 198 /* Allocate the bus. */ 199 if ((error = smbus_request_bus(parent, smbdev, 200 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) 201 return (error); 202 203 switch (cmd) { 204 case SMB_QUICK_WRITE: 205 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); 206 break; 207 208 case SMB_QUICK_READ: 209 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); 210 break; 211 212 case SMB_SENDB: 213 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); 214 break; 215 216 case SMB_RECVB: 217 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); 218 break; 219 220 case SMB_WRITEB: 221 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, 222 s->data.byte)); 223 break; 224 225 case SMB_WRITEW: 226 error = smbus_error(smbus_writew(parent, s->slave, 227 s->cmd, s->data.word)); 228 break; 229 230 case SMB_READB: 231 if (s->data.byte_ptr) { 232 error = smbus_error(smbus_readb(parent, s->slave, 233 s->cmd, &c)); 234 if (error) 235 break; 236 error = copyout(&c, s->data.byte_ptr, 237 sizeof(*(s->data.byte_ptr))); 238 } 239 break; 240 241 case SMB_READW: 242 if (s->data.word_ptr) { 243 error = smbus_error(smbus_readw(parent, s->slave, 244 s->cmd, &w)); 245 if (error == 0) { 246 error = copyout(&w, s->data.word_ptr, 247 sizeof(*(s->data.word_ptr))); 248 } 249 } 250 break; 251 252 case SMB_PCALL: 253 if (s->data.process.rdata) { 254 255 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, 256 s->data.process.sdata, &w)); 257 if (error) 258 break; 259 error = copyout(&w, s->data.process.rdata, 260 sizeof(*(s->data.process.rdata))); 261 } 262 263 break; 264 265 case SMB_BWRITE: 266 if (s->count && s->data.byte_ptr) { 267 if (s->count > SMB_MAXBLOCKSIZE) 268 s->count = SMB_MAXBLOCKSIZE; 269 error = copyin(s->data.byte_ptr, buf, s->count); 270 if (error) 271 break; 272 error = smbus_error(smbus_bwrite(parent, s->slave, 273 s->cmd, s->count, buf)); 274 } 275 break; 276 277 #if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || defined(COMPAT_FREEBSD6) 278 case SMB_OLD_BREAD: 279 #endif 280 case SMB_BREAD: 281 if (s->count && s->data.byte_ptr) { 282 count = min(s->count, SMB_MAXBLOCKSIZE); 283 error = smbus_error(smbus_bread(parent, s->slave, 284 s->cmd, &count, buf)); 285 if (error) 286 break; 287 error = copyout(buf, s->data.byte_ptr, 288 min(count, s->count)); 289 s->count = count; 290 } 291 break; 292 293 default: 294 error = ENOTTY; 295 } 296 297 smbus_release_bus(parent, smbdev); 298 299 return (error); 300 } 301 302 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0); 303 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER); 304 MODULE_VERSION(smb, 1); 305