1 /*- 2 * Copyright (c) 1998, 2001 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/uio.h> 36 #include <sys/fcntl.h> 37 38 #include <dev/iicbus/iiconf.h> 39 #include <dev/iicbus/iicbus.h> 40 #include <dev/iicbus/iic.h> 41 42 #include "iicbus_if.h" 43 44 #define BUFSIZE 1024 45 46 struct iic_softc { 47 48 u_char sc_addr; /* 7 bit address on iicbus */ 49 int sc_count; /* >0 if device opened */ 50 51 char sc_buffer[BUFSIZE]; /* output buffer */ 52 char sc_inbuf[BUFSIZE]; /* input buffer */ 53 54 dev_t sc_devnode; 55 }; 56 57 #define IIC_SOFTC(unit) \ 58 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit))) 59 60 #define IIC_DEVICE(unit) \ 61 (devclass_get_device(iic_devclass, (unit))) 62 63 static int iic_probe(device_t); 64 static int iic_attach(device_t); 65 static int iic_detach(device_t); 66 static void iic_identify(driver_t *driver, device_t parent); 67 68 static devclass_t iic_devclass; 69 70 static device_method_t iic_methods[] = { 71 /* device interface */ 72 DEVMETHOD(device_identify, iic_identify), 73 DEVMETHOD(device_probe, iic_probe), 74 DEVMETHOD(device_attach, iic_attach), 75 DEVMETHOD(device_detach, iic_detach), 76 77 /* iicbus interface */ 78 DEVMETHOD(iicbus_intr, iicbus_generic_intr), 79 80 { 0, 0 } 81 }; 82 83 static driver_t iic_driver = { 84 "iic", 85 iic_methods, 86 sizeof(struct iic_softc), 87 }; 88 89 static d_open_t iicopen; 90 static d_close_t iicclose; 91 static d_write_t iicwrite; 92 static d_read_t iicread; 93 static d_ioctl_t iicioctl; 94 95 #define CDEV_MAJOR 105 96 static struct cdevsw iic_cdevsw = { 97 .d_open = iicopen, 98 .d_close = iicclose, 99 .d_read = iicread, 100 .d_write = iicwrite, 101 .d_ioctl = iicioctl, 102 .d_name = "iic", 103 .d_maj = CDEV_MAJOR, 104 }; 105 106 static void 107 iic_identify(driver_t *driver, device_t parent) 108 { 109 BUS_ADD_CHILD(parent, 0, "iic", 0); 110 } 111 112 static int 113 iic_probe(device_t dev) 114 { 115 device_set_desc(dev, "I2C generic I/O"); 116 return (0); 117 } 118 119 static int 120 iic_attach(device_t dev) 121 { 122 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev); 123 124 if (!sc) 125 return (ENOMEM); 126 127 bzero(sc, sizeof(struct iic_softc)); 128 129 sc->sc_devnode = make_dev(&iic_cdevsw, device_get_unit(dev), 130 UID_ROOT, GID_WHEEL, 131 0600, "iic%d", device_get_unit(dev)); 132 133 return (0); 134 } 135 136 static int 137 iic_detach(device_t dev) 138 { 139 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev); 140 141 if (sc->sc_devnode) 142 destroy_dev(sc->sc_devnode); 143 144 return (0); 145 } 146 147 static int 148 iicopen (dev_t dev, int flags, int fmt, struct thread *td) 149 { 150 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 151 152 if (!sc) 153 return (EINVAL); 154 155 if (sc->sc_count > 0) 156 return (EBUSY); 157 158 sc->sc_count++; 159 160 return (0); 161 } 162 163 static int 164 iicclose(dev_t dev, int flags, int fmt, struct thread *td) 165 { 166 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 167 168 if (!sc) 169 return (EINVAL); 170 171 if (!sc->sc_count) 172 return (EINVAL); 173 174 sc->sc_count--; 175 176 if (sc->sc_count < 0) 177 panic("%s: iic_count < 0!", __func__); 178 179 return (0); 180 } 181 182 static int 183 iicwrite(dev_t dev, struct uio * uio, int ioflag) 184 { 185 device_t iicdev = IIC_DEVICE(minor(dev)); 186 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 187 int sent, error, count; 188 189 if (!sc || !iicdev || !sc->sc_addr) 190 return (EINVAL); 191 192 if (sc->sc_count == 0) 193 return (EINVAL); 194 195 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 196 return (error); 197 198 count = min(uio->uio_resid, BUFSIZE); 199 uiomove(sc->sc_buffer, count, uio); 200 201 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr, 202 sc->sc_buffer, count, &sent); 203 204 iicbus_release_bus(device_get_parent(iicdev), iicdev); 205 206 return(error); 207 } 208 209 static int 210 iicread(dev_t dev, struct uio * uio, int ioflag) 211 { 212 device_t iicdev = IIC_DEVICE(minor(dev)); 213 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 214 int len, error = 0; 215 int bufsize; 216 217 if (!sc || !iicdev || !sc->sc_addr) 218 return (EINVAL); 219 220 if (sc->sc_count == 0) 221 return (EINVAL); 222 223 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 224 return (error); 225 226 /* max amount of data to read */ 227 len = min(uio->uio_resid, BUFSIZE); 228 229 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr, 230 sc->sc_inbuf, len, &bufsize))) 231 return (error); 232 233 if (bufsize > uio->uio_resid) 234 panic("%s: too much data read!", __func__); 235 236 iicbus_release_bus(device_get_parent(iicdev), iicdev); 237 238 return (uiomove(sc->sc_inbuf, bufsize, uio)); 239 } 240 241 static int 242 iicioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 243 { 244 device_t iicdev = IIC_DEVICE(minor(dev)); 245 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 246 device_t parent = device_get_parent(iicdev); 247 struct iiccmd *s = (struct iiccmd *)data; 248 int error, count; 249 250 if (!sc) 251 return (EINVAL); 252 253 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, 254 (flags & O_NONBLOCK) ? IIC_DONTWAIT : 255 (IIC_WAIT | IIC_INTR)))) 256 return (error); 257 258 switch (cmd) { 259 case I2CSTART: 260 error = iicbus_start(parent, s->slave, 0); 261 262 /* 263 * Implicitly set the chip addr to the slave addr passed as 264 * parameter. Consequently, start/stop shall be called before 265 * the read or the write of a block. 266 */ 267 if (!error) 268 sc->sc_addr = s->slave; 269 270 break; 271 272 case I2CSTOP: 273 error = iicbus_stop(parent); 274 break; 275 276 case I2CRSTCARD: 277 error = iicbus_reset(parent, 0, 0, NULL); 278 break; 279 280 case I2CWRITE: 281 error = iicbus_write(parent, s->buf, s->count, &count, 10); 282 break; 283 284 case I2CREAD: 285 error = iicbus_read(parent, s->buf, s->count, &count, s->last, 10); 286 break; 287 288 default: 289 error = ENODEV; 290 } 291 292 iicbus_release_bus(device_get_parent(iicdev), iicdev); 293 294 return (error); 295 } 296 297 DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0); 298 MODULE_DEPEND(iic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 299 MODULE_VERSION(iic, 1); 300