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