| 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 | dev_ops_add(&iic_ops, -1, device_get_unit(dev)); |
| 127 | make_dev(&iic_ops, device_get_unit(dev), /* XXX cleanup */ |
| 128 | UID_ROOT, GID_WHEEL, |
| 129 | 0600, "iic%d", device_get_unit(dev)); |
| 130 | return (0); |
| 131 | } |
| 132 | |
| 133 | static int |
| 134 | iicopen (struct dev_open_args *ap) |
| 135 | { |
| 136 | cdev_t dev = ap->a_head.a_dev; |
| 137 | struct iic_softc *sc = IIC_SOFTC(minor(dev)); |
| 138 | |
| 139 | if (!sc) |
| 140 | return (EINVAL); |
| 141 | |
| 142 | if (sc->sc_count > 0) |
| 143 | return (EBUSY); |
| 144 | |
| 145 | sc->sc_count++; |
| 146 | |
| 147 | return (0); |
| 148 | } |
| 149 | |
| 150 | static int |
| 151 | iicclose(struct dev_close_args *ap) |
| 152 | { |
| 153 | cdev_t dev = ap->a_head.a_dev; |
| 154 | struct iic_softc *sc = IIC_SOFTC(minor(dev)); |
| 155 | |
| 156 | if (!sc) |
| 157 | return (EINVAL); |
| 158 | |
| 159 | if (!sc->sc_count) |
| 160 | return (EINVAL); |
| 161 | |
| 162 | sc->sc_count--; |
| 163 | |
| 164 | if (sc->sc_count < 0) |
| 165 | panic("%s: iic_count < 0!", __func__); |
| 166 | |
| 167 | return (0); |
| 168 | } |
| 169 | |
| 170 | static int |
| 171 | iicwrite(struct dev_write_args *ap) |
| 172 | { |
| 173 | cdev_t dev = ap->a_head.a_dev; |
| 174 | struct uio *uio = ap->a_uio; |
| 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 | |
| 199 | static int |
| 200 | iicread(struct dev_read_args *ap) |
| 201 | { |
| 202 | cdev_t dev = ap->a_head.a_dev; |
| 203 | struct uio *uio = ap->a_uio; |
| 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!", __func__); |
| 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(struct dev_ioctl_args *ap) |
| 235 | { |
| 236 | cdev_t dev = ap->a_head.a_dev; |
| 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 *)ap->a_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 | (ap->a_fflag & O_NONBLOCK) ? IIC_DONTWAIT : |
| 248 | (IIC_WAIT | IIC_INTR)))) |
| 249 | return (error); |
| 250 | |
| 251 | switch (ap->a_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 | |
| 281 | DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0); |