1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/systm.h> 34 #include <sys/module.h> 35 #include <sys/bus.h> 36 #include <sys/conf.h> 37 #include <sys/uio.h> 38 #include <sys/fcntl.h> 39 40 #include <dev/smbus/smbconf.h> 41 #include <dev/smbus/smbus.h> 42 #include <dev/smbus/smb.h> 43 44 #include "smbus_if.h" 45 46 #define SMB_OLD_READB _IOW('i', 7, struct smbcmd) 47 #define SMB_OLD_READW _IOW('i', 8, struct smbcmd) 48 #define SMB_OLD_PCALL _IOW('i', 9, struct smbcmd) 49 50 struct smb_softc { 51 device_t sc_dev; 52 struct cdev *sc_devnode; 53 }; 54 55 static void smb_identify(driver_t *driver, device_t parent); 56 static int smb_probe(device_t); 57 static int smb_attach(device_t); 58 static int smb_detach(device_t); 59 60 static devclass_t smb_devclass; 61 62 static device_method_t smb_methods[] = { 63 /* device interface */ 64 DEVMETHOD(device_identify, smb_identify), 65 DEVMETHOD(device_probe, smb_probe), 66 DEVMETHOD(device_attach, smb_attach), 67 DEVMETHOD(device_detach, smb_detach), 68 69 /* smbus interface */ 70 DEVMETHOD(smbus_intr, smbus_generic_intr), 71 { 0, 0 } 72 }; 73 74 static driver_t smb_driver = { 75 "smb", 76 smb_methods, 77 sizeof(struct smb_softc), 78 }; 79 80 static d_ioctl_t smbioctl; 81 82 static struct cdevsw smb_cdevsw = { 83 .d_version = D_VERSION, 84 .d_flags = D_TRACKCLOSE, 85 .d_ioctl = smbioctl, 86 .d_name = "smb", 87 }; 88 89 static void 90 smb_identify(driver_t *driver, device_t parent) 91 { 92 93 if (device_find_child(parent, "smb", -1) == NULL) 94 BUS_ADD_CHILD(parent, 0, "smb", -1); 95 } 96 97 static int 98 smb_probe(device_t dev) 99 { 100 if (smbus_get_addr(dev) != -1) 101 return (ENXIO); 102 103 device_set_desc(dev, "SMBus generic I/O"); 104 return (BUS_PROBE_NOWILDCARD); 105 } 106 107 static int 108 smb_attach(device_t dev) 109 { 110 struct smb_softc *sc; 111 struct make_dev_args mda; 112 int error; 113 114 sc = device_get_softc(dev); 115 sc->sc_dev = dev; 116 117 make_dev_args_init(&mda); 118 mda.mda_devsw = &smb_cdevsw; 119 mda.mda_unit = device_get_unit(dev); 120 mda.mda_uid = UID_ROOT; 121 mda.mda_gid = GID_WHEEL; 122 mda.mda_mode = 0600; 123 mda.mda_si_drv1 = sc; 124 error = make_dev_s(&mda, &sc->sc_devnode, "smb%d", mda.mda_unit); 125 return (error); 126 } 127 128 static int 129 smb_detach(device_t dev) 130 { 131 struct smb_softc *sc; 132 133 sc = device_get_softc(dev); 134 destroy_dev(sc->sc_devnode); 135 return (0); 136 } 137 138 static int 139 smbioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 140 { 141 char buf[SMB_MAXBLOCKSIZE]; 142 device_t parent; 143 struct smbcmd *s = (struct smbcmd *)data; 144 struct smb_softc *sc = dev->si_drv1; 145 device_t smbdev = sc->sc_dev; 146 int error; 147 int unit; 148 u_char bcount; 149 150 /* 151 * If a specific slave device is being used, override any passed-in 152 * slave. 153 */ 154 unit = dev2unit(dev); 155 if (unit & 0x0400) 156 s->slave = unit & 0x03ff; 157 158 parent = device_get_parent(smbdev); 159 160 /* Make sure that LSB bit is cleared. */ 161 if (s->slave & 0x1) 162 return (EINVAL); 163 164 /* Allocate the bus. */ 165 if ((error = smbus_request_bus(parent, smbdev, 166 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) 167 return (error); 168 169 switch (cmd) { 170 case SMB_QUICK_WRITE: 171 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); 172 break; 173 174 case SMB_QUICK_READ: 175 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); 176 break; 177 178 case SMB_SENDB: 179 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); 180 break; 181 182 case SMB_RECVB: 183 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); 184 break; 185 186 case SMB_WRITEB: 187 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, 188 s->wdata.byte)); 189 break; 190 191 case SMB_WRITEW: 192 error = smbus_error(smbus_writew(parent, s->slave, 193 s->cmd, s->wdata.word)); 194 break; 195 196 case SMB_OLD_READB: 197 case SMB_READB: 198 /* NB: for SMB_OLD_READB the read data goes to rbuf only. */ 199 error = smbus_error(smbus_readb(parent, s->slave, s->cmd, 200 &s->rdata.byte)); 201 if (error) 202 break; 203 if (s->rbuf && s->rcount >= 1) { 204 error = copyout(&s->rdata.byte, s->rbuf, 1); 205 s->rcount = 1; 206 } 207 break; 208 209 case SMB_OLD_READW: 210 case SMB_READW: 211 /* NB: for SMB_OLD_READW the read data goes to rbuf only. */ 212 error = smbus_error(smbus_readw(parent, s->slave, s->cmd, 213 &s->rdata.word)); 214 if (error) 215 break; 216 if (s->rbuf && s->rcount >= 2) { 217 buf[0] = (u_char)s->rdata.word; 218 buf[1] = (u_char)(s->rdata.word >> 8); 219 error = copyout(buf, s->rbuf, 2); 220 s->rcount = 2; 221 } 222 break; 223 224 case SMB_OLD_PCALL: 225 case SMB_PCALL: 226 /* NB: for SMB_OLD_PCALL the read data goes to rbuf only. */ 227 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, 228 s->wdata.word, &s->rdata.word)); 229 if (error) 230 break; 231 if (s->rbuf && s->rcount >= 2) { 232 buf[0] = (u_char)s->rdata.word; 233 buf[1] = (u_char)(s->rdata.word >> 8); 234 error = copyout(buf, s->rbuf, 2); 235 s->rcount = 2; 236 } 237 238 break; 239 240 case SMB_BWRITE: 241 if (s->wcount < 0) { 242 error = EINVAL; 243 break; 244 } 245 if (s->wcount > SMB_MAXBLOCKSIZE) 246 s->wcount = SMB_MAXBLOCKSIZE; 247 if (s->wcount) 248 error = copyin(s->wbuf, buf, s->wcount); 249 if (error) 250 break; 251 error = smbus_error(smbus_bwrite(parent, s->slave, s->cmd, 252 s->wcount, buf)); 253 break; 254 255 case SMB_BREAD: 256 if (s->rcount < 0) { 257 error = EINVAL; 258 break; 259 } 260 if (s->rcount > SMB_MAXBLOCKSIZE) 261 s->rcount = SMB_MAXBLOCKSIZE; 262 error = smbus_error(smbus_bread(parent, s->slave, s->cmd, 263 &bcount, buf)); 264 if (error) 265 break; 266 if (s->rcount > bcount) 267 s->rcount = bcount; 268 error = copyout(buf, s->rbuf, s->rcount); 269 break; 270 271 default: 272 error = ENOTTY; 273 } 274 275 smbus_release_bus(parent, smbdev); 276 277 return (error); 278 } 279 280 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0); 281 MODULE_DEPEND(smb, smbus, SMBUS_MINVER, SMBUS_PREFVER, SMBUS_MAXVER); 282 MODULE_VERSION(smb, 1); 283