iic.c revision 59391
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 59391 2000-04-19 14:58:28Z 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/uio.h> 36#include <sys/fcntl.h> 37 38#include <machine/clock.h> 39 40#include <dev/iicbus/iiconf.h> 41#include <dev/iicbus/iicbus.h> 42 43#include <machine/iic.h> 44 45#include "iicbus_if.h" 46 47#define BUFSIZE 1024 48 49struct iic_softc { 50 51 u_char sc_addr; /* address on iicbus */ 52 int sc_count; /* >0 if device opened */ 53 54 char sc_buffer[BUFSIZE]; /* output buffer */ 55 char sc_inbuf[BUFSIZE]; /* input buffer */ 56}; 57 58#define IIC_SOFTC(unit) \ 59 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit))) 60 61#define IIC_DEVICE(unit) \ 62 (devclass_get_device(iic_devclass, (unit))) 63 64static int iic_probe(device_t); 65static int iic_attach(device_t); 66 67static devclass_t iic_devclass; 68 69static device_method_t iic_methods[] = { 70 /* device interface */ 71 DEVMETHOD(device_probe, iic_probe), 72 DEVMETHOD(device_attach, iic_attach), 73 74 /* iicbus interface */ 75 DEVMETHOD(iicbus_intr, iicbus_generic_intr), 76 77 { 0, 0 } 78}; 79 80static driver_t iic_driver = { 81 "iic", 82 iic_methods, 83 sizeof(struct iic_softc), 84}; 85 86static d_open_t iicopen; 87static d_close_t iicclose; 88static d_write_t iicwrite; 89static d_read_t iicread; 90static d_ioctl_t iicioctl; 91 92#define CDEV_MAJOR 105 93static struct cdevsw iic_cdevsw = { 94 /* open */ iicopen, 95 /* close */ iicclose, 96 /* read */ iicread, 97 /* write */ iicwrite, 98 /* ioctl */ iicioctl, 99 /* poll */ nopoll, 100 /* mmap */ nommap, 101 /* strategy */ nostrategy, 102 /* name */ "iic", 103 /* maj */ CDEV_MAJOR, 104 /* dump */ nodump, 105 /* psize */ nopsize, 106 /* flags */ 0, 107 /* bmaj */ -1 108}; 109 110/* 111 * iicprobe() 112 */ 113static int 114iic_probe(device_t dev) 115{ 116 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev); 117 118 sc->sc_addr = iicbus_get_addr(dev); 119 120 /* XXX detect chip with start/stop conditions */ 121 122 return (0); 123} 124 125/* 126 * iicattach() 127 */ 128static int 129iic_attach(device_t dev) 130{ 131 make_dev(&iic_cdevsw, device_get_unit(dev), /* XXX cleanup */ 132 UID_ROOT, GID_WHEEL, 133 0600, "iic%d", device_get_unit(dev)); 134 return (0); 135} 136 137static int 138iicopen (dev_t dev, int flags, int fmt, struct proc *p) 139{ 140 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 141 142 if (!sc) 143 return (EINVAL); 144 145 if (sc->sc_count > 0) 146 return (EBUSY); 147 148 sc->sc_count++; 149 150 return (0); 151} 152 153static int 154iicclose(dev_t dev, int flags, int fmt, struct proc *p) 155{ 156 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 157 158 if (!sc) 159 return (EINVAL); 160 161 if (!sc->sc_count) 162 return (EINVAL); 163 164 sc->sc_count--; 165 166 if (sc->sc_count < 0) 167 panic("%s: iic_count < 0!", __FUNCTION__); 168 169 return (0); 170} 171 172static int 173iicwrite(dev_t dev, struct uio * uio, int ioflag) 174{ 175 device_t iicdev = IIC_DEVICE(minor(dev)); 176 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 177 int sent, error, count; 178 179 if (!sc || !iicdev) 180 return (EINVAL); 181 182 if (sc->sc_count == 0) 183 return (EINVAL); 184 185 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 186 return (error); 187 188 count = min(uio->uio_resid, BUFSIZE); 189 uiomove(sc->sc_buffer, count, uio); 190 191 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr, 192 sc->sc_buffer, count, &sent); 193 194 iicbus_release_bus(device_get_parent(iicdev), iicdev); 195 196 return(error); 197} 198 199static int 200iicread(dev_t dev, struct uio * uio, int ioflag) 201{ 202 device_t iicdev = IIC_DEVICE(minor(dev)); 203 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 204 int len, error = 0; 205 int bufsize; 206 207 if (!sc || !iicdev) 208 return (EINVAL); 209 210 if (sc->sc_count == 0) 211 return (EINVAL); 212 213 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 214 return (error); 215 216 /* max amount of data to read */ 217 len = min(uio->uio_resid, BUFSIZE); 218 219 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr, 220 sc->sc_inbuf, len, &bufsize))) 221 return (error); 222 223 if (bufsize > uio->uio_resid) 224 panic("%s: too much data read!", __FUNCTION__); 225 226 iicbus_release_bus(device_get_parent(iicdev), iicdev); 227 228 return (uiomove(sc->sc_inbuf, bufsize, uio)); 229} 230 231static int 232iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 233{ 234 device_t iicdev = IIC_DEVICE(minor(dev)); 235 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 236 device_t parent = device_get_parent(iicdev); 237 struct iiccmd *s = (struct iiccmd *)data; 238 int error, count; 239 240 if (!sc) 241 return (EINVAL); 242 243 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, 244 (flags & O_NONBLOCK) ? IIC_DONTWAIT : 245 (IIC_WAIT | IIC_INTR)))) 246 return (error); 247 248 switch (cmd) { 249 case I2CSTART: 250 error = iicbus_start(parent, s->slave, 0); 251 break; 252 253 case I2CSTOP: 254 error = iicbus_stop(parent); 255 break; 256 257 case I2CRSTCARD: 258 error = iicbus_reset(parent, 0, 0, NULL); 259 break; 260 261 case I2CWRITE: 262 error = iicbus_write(parent, s->buf, s->count, &count, 0); 263 break; 264 265 case I2CREAD: 266 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0); 267 break; 268 269 default: 270 error = ENODEV; 271 } 272 273 iicbus_release_bus(device_get_parent(iicdev), iicdev); 274 275 return (error); 276} 277 278DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0); 279