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: src/sys/dev/iicbus/iic.c,v 1.18 1999/11/18 05:43:32 peter Exp $ 27 * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.10 2006/09/10 01:26:32 dillon Exp $ 28 * 29 */ 30 #include <sys/param.h> 31 #include <sys/kernel.h> 32 #include <sys/systm.h> 33 #include <sys/module.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/buf.h> 37 #include <sys/uio.h> 38 #include <sys/malloc.h> 39 #include <sys/fcntl.h> 40 41 #include <machine/clock.h> 42 43 #include "iiconf.h" 44 #include "iicbus.h" 45 46 #include <machine/iic.h> 47 48 #include "iicbus_if.h" 49 50 #define BUFSIZE 1024 51 52 struct iic_softc { 53 54 u_char sc_addr; /* address on iicbus */ 55 int sc_count; /* >0 if device opened */ 56 57 char sc_buffer[BUFSIZE]; /* output buffer */ 58 char sc_inbuf[BUFSIZE]; /* input buffer */ 59 }; 60 61 #define IIC_SOFTC(unit) \ 62 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit))) 63 64 #define IIC_DEVICE(unit) \ 65 (devclass_get_device(iic_devclass, (unit))) 66 67 static int iic_probe(device_t); 68 static int iic_attach(device_t); 69 70 static devclass_t iic_devclass; 71 72 static device_method_t iic_methods[] = { 73 /* device interface */ 74 DEVMETHOD(device_probe, iic_probe), 75 DEVMETHOD(device_attach, iic_attach), 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 dev_ops iic_ops = { 97 { "iic", CDEV_MAJOR, 0 }, 98 .d_open = iicopen, 99 .d_close = iicclose, 100 .d_read = iicread, 101 .d_write = iicwrite, 102 .d_ioctl = iicioctl, 103 }; 104 105 /* 106 * iicprobe() 107 */ 108 static int 109 iic_probe(device_t dev) 110 { 111 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev); 112 113 sc->sc_addr = iicbus_get_addr(dev); 114 115 /* XXX detect chip with start/stop conditions */ 116 117 return (0); 118 } 119 120 /* 121 * iicattach() 122 */ 123 static int 124 iic_attach(device_t dev) 125 { 126 make_dev(&iic_ops, device_get_unit(dev), /* XXX cleanup */ 127 UID_ROOT, GID_WHEEL, 128 0600, "iic%d", device_get_unit(dev)); 129 return (0); 130 } 131 132 static int 133 iicopen (struct dev_open_args *ap) 134 { 135 cdev_t dev = ap->a_head.a_dev; 136 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 137 138 if (!sc) 139 return (EINVAL); 140 141 if (sc->sc_count > 0) 142 return (EBUSY); 143 144 sc->sc_count++; 145 146 return (0); 147 } 148 149 static int 150 iicclose(struct dev_close_args *ap) 151 { 152 cdev_t dev = ap->a_head.a_dev; 153 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 154 155 if (!sc) 156 return (EINVAL); 157 158 if (!sc->sc_count) 159 return (EINVAL); 160 161 sc->sc_count--; 162 163 if (sc->sc_count < 0) 164 panic("%s: iic_count < 0!", __func__); 165 166 return (0); 167 } 168 169 static int 170 iicwrite(struct dev_write_args *ap) 171 { 172 cdev_t dev = ap->a_head.a_dev; 173 struct uio *uio = ap->a_uio; 174 device_t iicdev = IIC_DEVICE(minor(dev)); 175 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 176 int sent, error, count; 177 178 if (!sc || !iicdev) 179 return (EINVAL); 180 181 if (sc->sc_count == 0) 182 return (EINVAL); 183 184 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 185 return (error); 186 187 count = (int)szmin(uio->uio_resid, BUFSIZE); 188 uiomove(sc->sc_buffer, (size_t)count, uio); 189 190 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr, 191 sc->sc_buffer, count, &sent); 192 193 iicbus_release_bus(device_get_parent(iicdev), iicdev); 194 195 return(error); 196 } 197 198 static int 199 iicread(struct dev_read_args *ap) 200 { 201 cdev_t dev = ap->a_head.a_dev; 202 struct uio *uio = ap->a_uio; 203 device_t iicdev = IIC_DEVICE(minor(dev)); 204 struct iic_softc *sc = IIC_SOFTC(minor(dev)); 205 int len, error = 0; 206 int bufsize; 207 208 if (!sc || !iicdev) 209 return (EINVAL); 210 211 if (sc->sc_count == 0) 212 return (EINVAL); 213 214 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT))) 215 return (error); 216 217 /* max amount of data to read */ 218 len = (int)szmin(uio->uio_resid, BUFSIZE); 219 220 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr, 221 sc->sc_inbuf, len, &bufsize))) 222 return (error); 223 224 if (bufsize > uio->uio_resid) 225 panic("%s: too much data read!", __func__); 226 227 iicbus_release_bus(device_get_parent(iicdev), iicdev); 228 229 return (uiomove(sc->sc_inbuf, (size_t)bufsize, uio)); 230 } 231 232 static int 233 iicioctl(struct dev_ioctl_args *ap) 234 { 235 cdev_t dev = ap->a_head.a_dev; 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 *)ap->a_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 (ap->a_fflag & O_NONBLOCK) ? IIC_DONTWAIT : 247 (IIC_WAIT | IIC_INTR)))) 248 return (error); 249 250 switch (ap->a_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