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 /* stop */ nostop, 103 /* reset */ noreset, 104 /* devtotty */ nodevtotty, 105 /* poll */ nopoll, 106 /* mmap */ nommap, 107 /* strategy */ nostrategy, 108 /* name */ "smb", 109 /* parms */ noparms, 110 /* maj */ CDEV_MAJOR, 111 /* dump */ nodump, 112 /* psize */ nopsize, 113 /* flags */ 0, 114 /* maxio */ 0, 115 /* bmaj */ -1 116 }; 117 118 /* 119 * smbprobe() 120 */ 121 static int 122 smb_probe(device_t dev) 123 { 124 struct smb_softc *sc = (struct smb_softc *)device_get_softc(dev); 125 126 sc->sc_addr = smbus_get_addr(dev); 127 128 /* XXX detect chip with start/stop conditions */ 129 130 return (0); 131 } 132 133 /* 134 * smbattach() 135 */ 136 static int 137 smb_attach(device_t dev) 138 { 139 return (0); 140 } 141 142 static int 143 smbopen (dev_t dev, int flags, int fmt, struct proc *p) 144 { 145 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 146 147 if (!sc) 148 return (EINVAL); 149 150 if (sc->sc_count) 151 return (EBUSY); 152 153 sc->sc_count++; 154 155 return (0); 156 } 157 158 static int 159 smbclose(dev_t dev, int flags, int fmt, struct proc *p) 160 { 161 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 162 163 if (!sc) 164 return (EINVAL); 165 166 if (!sc->sc_count) 167 return (EINVAL); 168 169 sc->sc_count--; 170 171 return (0); 172 } 173 174 static int 175 smbwrite(dev_t dev, struct uio * uio, int ioflag) 176 { 177 /* not supported */ 178 179 return (ENODEV); 180 } 181 182 static int 183 smbread(dev_t dev, struct uio * uio, int ioflag) 184 { 185 /* not supported */ 186 187 return (ENODEV); 188 } 189 190 static int 191 smbioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 192 { 193 device_t smbdev = IIC_DEVICE(minor(dev)); 194 struct smb_softc *sc = IIC_SOFTC(minor(dev)); 195 device_t parent = device_get_parent(smbdev); 196 197 int error = 0; 198 struct smbcmd *s = (struct smbcmd *)data; 199 200 if (!sc || !s) 201 return (EINVAL); 202 203 /* allocate the bus */ 204 if ((error = smbus_request_bus(parent, smbdev, 205 (flags & O_NONBLOCK) ? SMB_DONTWAIT : (SMB_WAIT | SMB_INTR)))) 206 return (error); 207 208 switch (cmd) { 209 case SMB_QUICK_WRITE: 210 error = smbus_error(smbus_quick(parent, s->slave, SMB_QWRITE)); 211 break; 212 213 case SMB_QUICK_READ: 214 error = smbus_error(smbus_quick(parent, s->slave, SMB_QREAD)); 215 break; 216 217 case SMB_SENDB: 218 error = smbus_error(smbus_sendb(parent, s->slave, s->cmd)); 219 break; 220 221 case SMB_RECVB: 222 error = smbus_error(smbus_recvb(parent, s->slave, &s->cmd)); 223 break; 224 225 case SMB_WRITEB: 226 error = smbus_error(smbus_writeb(parent, s->slave, s->cmd, 227 s->data.byte)); 228 break; 229 230 case SMB_WRITEW: 231 error = smbus_error(smbus_writew(parent, s->slave, 232 s->cmd, s->data.word)); 233 break; 234 235 case SMB_READB: 236 if (s->data.byte_ptr) 237 error = smbus_error(smbus_readb(parent, s->slave, 238 s->cmd, s->data.byte_ptr)); 239 break; 240 241 case SMB_READW: 242 if (s->data.word_ptr) 243 error = smbus_error(smbus_readw(parent, s->slave, 244 s->cmd, s->data.word_ptr)); 245 break; 246 247 case SMB_PCALL: 248 if (s->data.process.rdata) 249 error = smbus_error(smbus_pcall(parent, s->slave, s->cmd, 250 s->data.process.sdata, s->data.process.rdata)); 251 break; 252 253 case SMB_BWRITE: 254 if (s->count && s->data.byte_ptr) 255 error = smbus_error(smbus_bwrite(parent, s->slave, 256 s->cmd, s->count, s->data.byte_ptr)); 257 break; 258 259 case SMB_BREAD: 260 if (s->count && s->data.byte_ptr) 261 error = smbus_error(smbus_bread(parent, s->slave, 262 s->cmd, s->count, s->data.byte_ptr)); 263 break; 264 265 default: 266 error = ENODEV; 267 } 268 269 /* release the bus */ 270 smbus_release_bus(parent, smbdev); 271 272 return (error); 273 } 274 275 DEV_DRIVER_MODULE(smb, smbus, smb_driver, smb_devclass, smb_cdevsw, 0, 0); 276