iic.c revision 51658
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: head/sys/dev/iicbus/iic.c 51658 1999-09-25 18:24:47Z phk $ 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/iicbus/iiconf.h> 43#include <dev/iicbus/iicbus.h> 44 45#include <machine/iic.h> 46 47#include "iicbus_if.h" 48 49#define BUFSIZE 1024 50 51struct iic_softc { 52 53 u_char sc_addr; /* address on iicbus */ 54 int sc_count; /* >0 if device opened */ 55 56 char sc_buffer[BUFSIZE]; /* output buffer */ 57 char sc_inbuf[BUFSIZE]; /* input buffer */ 58}; 59 60#define IIC_SOFTC(unit) \ 61 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit))) 62 63#define IIC_DEVICE(unit) \ 64 (devclass_get_device(iic_devclass, (unit))) 65 66static int iic_probe(device_t); 67static int iic_attach(device_t); 68 69static devclass_t iic_devclass; 70 71static device_method_t iic_methods[] = { 72 /* device interface */ 73 DEVMETHOD(device_probe, iic_probe), 74 DEVMETHOD(device_attach, iic_attach), 75 76 /* iicbus interface */ 77 DEVMETHOD(iicbus_intr, iicbus_generic_intr), 78 79 { 0, 0 } 80}; 81 82static driver_t iic_driver = { 83 "iic", 84 iic_methods, 85 sizeof(struct iic_softc), 86}; 87 88static d_open_t iicopen; 89static d_close_t iicclose; 90static d_write_t iicwrite; 91static d_read_t iicread; 92static d_ioctl_t iicioctl; 93 94#define CDEV_MAJOR 105 95static struct cdevsw iic_cdevsw = { 96 /* open */ iicopen, 97 /* close */ iicclose, 98 /* read */ iicread, 99 /* write */ iicwrite, 100 /* ioctl */ iicioctl, 101 /* poll */ nopoll, 102 /* mmap */ nommap, 103 /* strategy */ nostrategy, 104 /* name */ "iic", 105 /* maj */ CDEV_MAJOR, 106 /* dump */ nodump, 107 /* psize */ nopsize, 108 /* flags */ 0, 109 /* bmaj */ -1 110}; 111 112/* 113 * iicprobe() 114 */ 115static int 116iic_probe(device_t dev) 117{ 118 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev); 119 static int once; 120 121 if (!once++) 122 cdevsw_add(&iic_cdevsw); 123 124 sc->sc_addr = iicbus_get_addr(dev); 125 126 /* XXX detect chip with start/stop conditions */ 127 128 return (0); 129} 130 131/* 132 * iicattach() 133 */ 134static int 135iic_attach(device_t dev) 136{ 137 return (0); 138} 139 140static int 141iicopen (dev_t dev, int flags, int fmt, struct proc *p) 142{ 143 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 144 145 if (!sc) 146 return (EINVAL); 147 148 if (sc->sc_count > 0) 149 return (EBUSY); 150 151 sc->sc_count++; 152 153 return (0); 154} 155 156static int 157iicclose(dev_t dev, int flags, int fmt, struct proc *p) 158{ 159 struct iic_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 if (sc->sc_count < 0) 170 panic("%s: iic_count < 0!", __FUNCTION__); 171 172 return (0); 173} 174 175static int 176iicwrite(dev_t dev, struct uio * uio, int ioflag) 177{ 178 device_t iicdev = IIC_DEVICE(minor(dev)); 179 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 180 int sent, error, count; 181 182 if (!sc || !iicdev) 183 return (EINVAL); 184 185 if (sc->sc_count == 0) 186 return (EINVAL); 187 188 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 189 return (error); 190 191 count = min(uio->uio_resid, BUFSIZE); 192 uiomove(sc->sc_buffer, count, uio); 193 194 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr, 195 sc->sc_buffer, count, &sent); 196 197 iicbus_release_bus(device_get_parent(iicdev), iicdev); 198 199 return(error); 200} 201 202static int 203iicread(dev_t dev, struct uio * uio, int ioflag) 204{ 205 device_t iicdev = IIC_DEVICE(minor(dev)); 206 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 207 int len, error = 0; 208 int bufsize; 209 210 if (!sc || !iicdev) 211 return (EINVAL); 212 213 if (sc->sc_count == 0) 214 return (EINVAL); 215 216 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 217 return (error); 218 219 /* max amount of data to read */ 220 len = min(uio->uio_resid, BUFSIZE); 221 222 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr, 223 sc->sc_inbuf, len, &bufsize))) 224 return (error); 225 226 if (bufsize > uio->uio_resid) 227 panic("%s: too much data read!", __FUNCTION__); 228 229 iicbus_release_bus(device_get_parent(iicdev), iicdev); 230 231 return (uiomove(sc->sc_inbuf, bufsize, uio)); 232} 233 234static int 235iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 236{ 237 device_t iicdev = IIC_DEVICE(minor(dev)); 238 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 239 device_t parent = device_get_parent(iicdev); 240 struct iiccmd *s = (struct iiccmd *)data; 241 int error, count; 242 243 if (!sc) 244 return (EINVAL); 245 246 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, 247 (flags & O_NONBLOCK) ? IIC_DONTWAIT : 248 (IIC_WAIT | IIC_INTR)))) 249 return (error); 250 251 switch (cmd) { 252 case I2CSTART: 253 error = iicbus_start(parent, s->slave, 0); 254 break; 255 256 case I2CSTOP: 257 error = iicbus_stop(parent); 258 break; 259 260 case I2CRSTCARD: 261 error = iicbus_reset(parent, 0, 0, NULL); 262 break; 263 264 case I2CWRITE: 265 error = iicbus_write(parent, s->buf, s->count, &count, 0); 266 break; 267 268 case I2CREAD: 269 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0); 270 break; 271 272 default: 273 error = ENODEV; 274 } 275 276 iicbus_release_bus(device_get_parent(iicdev), iicdev); 277 278 return (error); 279} 280 281DEV_DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, iic_cdevsw, 0, 0); 282