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/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 51 struct 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 66 static int iic_probe(device_t); 67 static int iic_attach(device_t); 68 69 static devclass_t iic_devclass; 70 71 static 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 82 static driver_t iic_driver = { 83 "iic", 84 iic_methods, 85 sizeof(struct iic_softc), 86 }; 87 88 static d_open_t iicopen; 89 static d_close_t iicclose; 90 static d_write_t iicwrite; 91 static d_read_t iicread; 92 static d_ioctl_t iicioctl; 93 94 #define CDEV_MAJOR 105 95 static 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 */ 115 static int 116 iic_probe(device_t dev) 117 { 118 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev); 119 120 sc->sc_addr = iicbus_get_addr(dev); 121 122 /* XXX detect chip with start/stop conditions */ 123 124 return (0); 125 } 126 127 /* 128 * iicattach() 129 */ 130 static int 131 iic_attach(device_t dev) 132 { 133 make_dev(&iic_cdevsw, device_get_unit(dev), /* XXX cleanup */ 134 UID_ROOT, GID_WHEEL, 135 0600, "iic%d", device_get_unit(dev)); 136 return (0); 137 } 138 139 static int 140 iicopen (dev_t dev, int flags, int fmt, struct proc *p) 141 { 142 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 143 144 if (!sc) 145 return (EINVAL); 146 147 if (sc->sc_count > 0) 148 return (EBUSY); 149 150 sc->sc_count++; 151 152 return (0); 153 } 154 155 static int 156 iicclose(dev_t dev, int flags, int fmt, struct proc *p) 157 { 158 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 159 160 if (!sc) 161 return (EINVAL); 162 163 if (!sc->sc_count) 164 return (EINVAL); 165 166 sc->sc_count--; 167 168 if (sc->sc_count < 0) 169 panic("%s: iic_count < 0!", __FUNCTION__); 170 171 return (0); 172 } 173 174 static int 175 iicwrite(dev_t dev, struct uio * uio, int ioflag) 176 { 177 device_t iicdev = IIC_DEVICE(minor(dev)); 178 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 179 int sent, error, count; 180 181 if (!sc || !iicdev) 182 return (EINVAL); 183 184 if (sc->sc_count == 0) 185 return (EINVAL); 186 187 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 188 return (error); 189 190 count = min(uio->uio_resid, BUFSIZE); 191 uiomove(sc->sc_buffer, count, uio); 192 193 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr, 194 sc->sc_buffer, count, &sent); 195 196 iicbus_release_bus(device_get_parent(iicdev), iicdev); 197 198 return(error); 199 } 200 201 static int 202 iicread(dev_t dev, struct uio * uio, int ioflag) 203 { 204 device_t iicdev = IIC_DEVICE(minor(dev)); 205 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 206 int len, error = 0; 207 int bufsize; 208 209 if (!sc || !iicdev) 210 return (EINVAL); 211 212 if (sc->sc_count == 0) 213 return (EINVAL); 214 215 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 216 return (error); 217 218 /* max amount of data to read */ 219 len = min(uio->uio_resid, BUFSIZE); 220 221 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr, 222 sc->sc_inbuf, len, &bufsize))) 223 return (error); 224 225 if (bufsize > uio->uio_resid) 226 panic("%s: too much data read!", __FUNCTION__); 227 228 iicbus_release_bus(device_get_parent(iicdev), iicdev); 229 230 return (uiomove(sc->sc_inbuf, bufsize, uio)); 231 } 232 233 static int 234 iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 235 { 236 device_t iicdev = IIC_DEVICE(minor(dev)); 237 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 238 device_t parent = device_get_parent(iicdev); 239 struct iiccmd *s = (struct iiccmd *)data; 240 int error, count; 241 242 if (!sc) 243 return (EINVAL); 244 245 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, 246 (flags & O_NONBLOCK) ? IIC_DONTWAIT : 247 (IIC_WAIT | IIC_INTR)))) 248 return (error); 249 250 switch (cmd) { 251 case I2CSTART: 252 error = iicbus_start(parent, s->slave, 0); 253 break; 254 255 case I2CSTOP: 256 error = iicbus_stop(parent); 257 break; 258 259 case I2CRSTCARD: 260 error = iicbus_reset(parent, 0, 0, NULL); 261 break; 262 263 case I2CWRITE: 264 error = iicbus_write(parent, s->buf, s->count, &count, 0); 265 break; 266 267 case I2CREAD: 268 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 0); 269 break; 270 271 default: 272 error = ENODEV; 273 } 274 275 iicbus_release_bus(device_get_parent(iicdev), iicdev); 276 277 return (error); 278 } 279 280 DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0); 281