1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1998, 2001 Nicolas Souchu 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 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 SMB_OLD_READB _IOW('i', 7, struct smbcmd) 45 #define SMB_OLD_READW _IOW('i', 8, struct smbcmd) 46 #define SMB_OLD_PCALL _IOW('i', 9, struct smbcmd) 47 48 struct smb_softc { 49 device_t sc_dev; 50 struct cdev *sc_devnode; 51 }; 52 53 static void smb_identify(driver_t *driver, device_t parent); 54 static int smb_probe(device_t); 55 static int smb_attach(device_t); 56 static int smb_detach(device_t); 57 58 static device_method_t smb_methods[] = { 59 /* device interface */ 60 DEVMETHOD(device_identify, smb_identify), 61 DEVMETHOD(device_probe, smb_probe), 62 DEVMETHOD(device_attach, smb_attach), 63 DEVMETHOD(device_detach, smb_detach), 64 65 /* smbus interface */ 66 DEVMETHOD(smbus_intr, smbus_generic_intr), 67 { 0, 0 } 68 }; 69 70 static driver_t smb_driver = { 71 "smb", 72 smb_methods, 73 sizeof(struct smb_softc), 74 }; 75 76 static d_ioctl_t smbioctl; 77 78 static struct cdevsw smb_cdevsw = { 79 .d_version = D_VERSION, 80 .d_flags = D_TRACKCLOSE, 81 .d_ioctl = smbioctl, 82 .d_name = "smb", 83 }; 84 85 static void 86 smb_identify(driver_t *driver, device_t parent) 87 { 88 89 if (device_find_child(parent, "smb", -1) == NULL) 90 BUS_ADD_CHILD(parent, 0, "smb", -1); 91 } 92 93 static int 94 smb_probe(device_t dev) 95 { 96 if (smbus_get_addr(dev) != -1) 97 return (ENXIO); 98 99 device_set_desc(dev, "SMBus generic I/O"); 100 return (BUS_PROBE_NOWILDCARD); 101 } 102 103 static int 104 smb_attach(device_t dev) 105 { 106 struct smb_softc *sc; 107 struct make_dev_args mda; 108 int error; 109 110 sc = device_get_softc(dev); 111 sc->sc_dev = dev; 112 113 make_dev_args_init(&mda); 114 mda.mda_devsw = &smb_cdevsw; 115 mda.mda_unit = device_get_unit(dev); 116 mda.mda_uid = UID_ROOT; 117 mda.mda_gid = GID_WHEEL; 118 mda.mda_mode = 0600; 119 mda.mda_si_drv1 = sc; 120 error = make_dev_s(&mda, &sc->sc_devnode, "smb%d", mda.mda_unit); 121 return (error); 122 } 123 124 static int 125 smb_detach(device_t dev) 126 { 127 struct smb_softc *sc; 128 129 sc = device_get_softc(dev); 130 destroy_dev(sc->sc_devnode); 131 return (0); 132 } 133 134 static int 135 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 136 { 137 char buf[SMB_MAXBLOCKSIZE]; 138 device_t parent; 139 struct smbcmd *s = (struct smbcmd *)data; 140 struct smb_softc *sc = dev->si_drv1; 141 device_t smbdev = sc->sc_dev; 142 int error; 143 int unit; 144 u_char bcount; 145 146 /* 147 * If a specific slave device is being used, override any passed-in 148 * slave. 149 */ 150 unit = dev2unit(dev); 151 if (unit & 0x0400) 152 s->slave = unit & 0x03ff; 153 154 parent = device_get_parent(smbdev); 155 156 /* Make sure that LSB bit is cleared. */ 157 if (s->slave & 0x1) 158 return (EINVAL); 159 160 /* Allocate the bus. */ 161 if ((error = smbus_request_bus(parent, smbdev, 162 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) 163 return (error); 164 165 switch (cmd) { 166 case SMB_QUICK_WRITE: 167 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); 168 break; 169 170 case SMB_QUICK_READ: 171 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); 172 break; 173 174 case SMB_SENDB: 175 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); 176 break; 177 178 case SMB_RECVB: 179 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); 180 break; 181 182 case SMB_WRITEB: 183 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, 184 s->wdata.byte)); 185 break; 186 187 case SMB_WRITEW: 188 error = smbus_error(smbus_writew(parent, s->slave, 189 s->cmd, s->wdata.word)); 190 break; 191 192 case SMB_OLD_READB: 193 case SMB_READB: 194 /* NB: for SMB_OLD_READB the read data goes to rbuf only. */ 195 error = smbus_error(smbus_readb(parent, s->slave, s->cmd, 196 &s->rdata.byte)); 197 if (error) 198 break; 199 if (s->rbuf && s->rcount >= 1) { 200 error = copyout(&s->rdata.byte, s->rbuf, 1); 201 s->rcount = 1; 202 } 203 break; 204 205 case SMB_OLD_READW: 206 case SMB_READW: 207 /* NB: for SMB_OLD_READW the read data goes to rbuf only. */ 208 error = smbus_error(smbus_readw(parent, s->slave, s->cmd, 209 &s->rdata.word)); 210 if (error) 211 break; 212 if (s->rbuf && s->rcount >= 2) { 213 buf[0] = (u_char)s->rdata.word; 214 buf[1] = (u_char)(s->rdata.word >> 8); 215 error = copyout(buf, s->rbuf, 2); 216 s->rcount = 2; 217 } 218 break; 219 220 case SMB_OLD_PCALL: 221 case SMB_PCALL: 222 /* NB: for SMB_OLD_PCALL the read data goes to rbuf only. */ 223 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, 224 s->wdata.word, &s->rdata.word)); 225 if (error) 226 break; 227 if (s->rbuf && s->rcount >= 2) { 228 buf[0] = (u_char)s->rdata.word; 229 buf[1] = (u_char)(s->rdata.word >> 8); 230 error = copyout(buf, s->rbuf, 2); 231 s->rcount = 2; 232 } 233 234 break; 235 236 case SMB_BWRITE: 237 if (s->wcount < 0) { 238 error = EINVAL; 239 break; 240 } 241 if (s->wcount > SMB_MAXBLOCKSIZE) 242 s->wcount = SMB_MAXBLOCKSIZE; 243 if (s->wcount) 244 error = copyin(s->wbuf, buf, s->wcount); 245 if (error) 246 break; 247 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd, 248 s->wcount, buf)); 249 break; 250 251 case SMB_BREAD: 252 if (s->rcount < 0) { 253 error = EINVAL; 254 break; 255 } 256 if (s->rcount > SMB_MAXBLOCKSIZE) 257 s->rcount = SMB_MAXBLOCKSIZE; 258 error = smbus_error(smbus_bread(parent, s->slave, s->cmd, 259 &bcount, buf)); 260 if (error) 261 break; 262 if (s->rcount > bcount) 263 s->rcount = bcount; 264 error = copyout(buf, s->rbuf, s->rcount); 265 break; 266 267 default: 268 error = ENOTTY; 269 } 270 271 smbus_release_bus(parent, smbdev); 272 273 return (error); 274 } 275 276 DRIVER_MODULE(smb, smbus, smb_driver, 0, 0); 277 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER); 278 MODULE_VERSION(smb, 1); 279