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