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/buf.h> 36 #include <sys/uio.h> 37 #include <sys/malloc.h> 38 #include <sys/fcntl.h> 39 40 #include <machine/clock.h> 41 42 #include <dev/smbus/smbconf.h> 43 #include <dev/smbus/smbus.h> 44 #include <machine/smb.h> 45 46 #include "smbus_if.h" 47 48 #define BUFSIZE 1024 49 50 struct smb_softc { 51 52 int sc_addr; /* address on smbus */ 53 int sc_count; /* >0 if device opened */ 54 55 char *sc_cp; /* output buffer pointer */ 56 57 char sc_buffer[BUFSIZE]; /* output buffer */ 58 char sc_inbuf[BUFSIZE]; /* input buffer */ 59 }; 60 61 #define IIC_SOFTC(unit) \ 62 ((struct smb_softc *)devclass_get_softc(smb_devclass, (unit))) 63 64 #define IIC_DEVICE(unit) \ 65 (devclass_get_device(smb_devclass, (unit))) 66 67 static int smb_probe(device_t); 68 static int smb_attach(device_t); 69 70 static devclass_t smb_devclass; 71 72 static device_method_t smb_methods[] = { 73 /* device interface */ 74 DEVMETHOD(device_probe, smb_probe), 75 DEVMETHOD(device_attach, smb_attach), 76 77 /* smbus interface */ 78 DEVMETHOD(smbus_intr, smbus_generic_intr), 79 80 { 0, 0 } 81 }; 82 83 static driver_t smb_driver = { 84 "smb", 85 smb_methods, 86 sizeof(struct smb_softc), 87 }; 88 89 static d_open_t smbopen; 90 static d_close_t smbclose; 91 static d_write_t smbwrite; 92 static d_read_t smbread; 93 static d_ioctl_t smbioctl; 94 95 #define CDEV_MAJOR 106 96 static struct cdevsw smb_cdevsw = { 97 /* open */ smbopen, 98 /* close */ smbclose, 99 /* read */ smbread, 100 /* write */ smbwrite, 101 /* ioctl */ smbioctl, 102 /* poll */ nopoll, 103 /* mmap */ nommap, 104 /* strategy */ nostrategy, 105 /* name */ "smb", 106 /* maj */ CDEV_MAJOR, 107 /* dump */ nodump, 108 /* psize */ nopsize, 109 /* flags */ 0, 110 /* bmaj */ -1 111 }; 112 113 /* 114 * smbprobe() 115 */ 116 static int 117 smb_probe(device_t dev) 118 { 119 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 120 121 sc->sc_addr = smbus_get_addr(dev); 122 123 /* XXX detect chip with start/stop conditions */ 124 125 return (0); 126 } 127 128 /* 129 * smbattach() 130 */ 131 static int 132 smb_attach(device_t dev) 133 { 134 make_dev(&smb_cdevsw, device_get_unit(dev), /* XXX cleanup */ 135 UID_ROOT, GID_WHEEL, 136 0600, "smb%d", device_get_unit(dev)); 137 return (0); 138 } 139 140 static int 141 smbopen (dev_t dev, int flags, int fmt, struct proc *p) 142 { 143 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 144 145 if (!sc) 146 return (EINVAL); 147 148 if (sc->sc_count) 149 return (EBUSY); 150 151 sc->sc_count++; 152 153 return (0); 154 } 155 156 static int 157 smbclose(dev_t dev, int flags, int fmt, struct proc *p) 158 { 159 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 160 161 if (!sc) 162 return (EINVAL); 163 164 if (!sc->sc_count) 165 return (EINVAL); 166 167 sc->sc_count--; 168 169 return (0); 170 } 171 172 static int 173 smbwrite(dev_t dev, struct uio * uio, int ioflag) 174 { 175 /* not supported */ 176 177 return (EINVAL); 178 } 179 180 static int 181 smbread(dev_t dev, struct uio * uio, int ioflag) 182 { 183 /* not supported */ 184 185 return (EINVAL); 186 } 187 188 static int 189 smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 190 { 191 device_t smbdev = IIC_DEVICE(minor(dev)); 192 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 193 device_t parent = device_get_parent(smbdev); 194 195 int error = 0; 196 struct smbcmd *s = (struct smbcmd *)data; 197 198 if (!sc || !s) 199 return (EINVAL); 200 201 /* allocate the bus */ 202 if ((error = smbus_request_bus(parent, smbdev, 203 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) 204 return (error); 205 206 switch (cmd) { 207 case SMB_QUICK_WRITE: 208 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); 209 break; 210 211 case SMB_QUICK_READ: 212 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); 213 break; 214 215 case SMB_SENDB: 216 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); 217 break; 218 219 case SMB_RECVB: 220 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); 221 break; 222 223 case SMB_WRITEB: 224 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, 225 s->data.byte)); 226 break; 227 228 case SMB_WRITEW: 229 error = smbus_error(smbus_writew(parent, s->slave, 230 s->cmd, s->data.word)); 231 break; 232 233 case SMB_READB: 234 if (s->data.byte_ptr) 235 error = smbus_error(smbus_readb(parent, s->slave, 236 s->cmd, s->data.byte_ptr)); 237 break; 238 239 case SMB_READW: 240 if (s->data.word_ptr) 241 error = smbus_error(smbus_readw(parent, s->slave, 242 s->cmd, s->data.word_ptr)); 243 break; 244 245 case SMB_PCALL: 246 if (s->data.process.rdata) 247 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, 248 s->data.process.sdata, s->data.process.rdata)); 249 break; 250 251 case SMB_BWRITE: 252 if (s->count && s->data.byte_ptr) 253 error = smbus_error(smbus_bwrite(parent, s->slave, 254 s->cmd, s->count, s->data.byte_ptr)); 255 break; 256 257 case SMB_BREAD: 258 if (s->count && s->data.byte_ptr) 259 error = smbus_error(smbus_bread(parent, s->slave, 260 s->cmd, s->count, s->data.byte_ptr)); 261 break; 262 263 default: 264 error = ENODEV; 265 } 266 267 /* release the bus */ 268 smbus_release_bus(parent, smbdev); 269 270 return (error); 271 } 272 273 DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, 0, 0); 274