2 * Copyright (c) 1998, 2001 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/param.h>
30 #include <sys/kernel.h>
31 #include <sys/systm.h>
32 #include <sys/malloc.h>
33 #include <sys/module.h>
37 #include <sys/fcntl.h>
39 #include <dev/iicbus/iiconf.h>
40 #include <dev/iicbus/iicbus.h>
41 #include <dev/iicbus/iic.h>
43 #include "iicbus_if.h"
49 u_char sc_addr; /* 7 bit address on iicbus */
50 int sc_count; /* >0 if device opened */
52 char sc_buffer[BUFSIZE]; /* output buffer */
53 char sc_inbuf[BUFSIZE]; /* input buffer */
55 struct cdev *sc_devnode;
58 #define IIC_SOFTC(unit) \
59 ((struct iic_softc *)devclass_get_softc(iic_devclass, (unit)))
61 #define IIC_DEVICE(unit) \
62 (devclass_get_device(iic_devclass, (unit)))
64 static int iic_probe(device_t);
65 static int iic_attach(device_t);
66 static int iic_detach(device_t);
67 static void iic_identify(driver_t *driver, device_t parent);
69 static devclass_t iic_devclass;
71 static device_method_t iic_methods[] = {
72 /* device interface */
73 DEVMETHOD(device_identify, iic_identify),
74 DEVMETHOD(device_probe, iic_probe),
75 DEVMETHOD(device_attach, iic_attach),
76 DEVMETHOD(device_detach, iic_detach),
78 /* iicbus interface */
79 DEVMETHOD(iicbus_intr, iicbus_generic_intr),
84 static driver_t iic_driver = {
87 sizeof(struct iic_softc),
90 static d_open_t iicopen;
91 static d_close_t iicclose;
92 static d_write_t iicwrite;
93 static d_read_t iicread;
94 static d_ioctl_t iicioctl;
96 static struct cdevsw iic_cdevsw = {
97 .d_version = D_VERSION,
98 .d_flags = D_NEEDGIANT,
108 iic_identify(driver_t *driver, device_t parent)
110 BUS_ADD_CHILD(parent, 0, "iic", -1);
114 iic_probe(device_t dev)
116 device_set_desc(dev, "I2C generic I/O");
121 iic_attach(device_t dev)
123 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
125 sc->sc_devnode = make_dev(&iic_cdevsw, device_get_unit(dev),
127 0600, "iic%d", device_get_unit(dev));
132 iic_detach(device_t dev)
134 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
137 destroy_dev(sc->sc_devnode);
143 iicopen(struct cdev *dev, int flags, int fmt, struct thread *td)
145 struct iic_softc *sc = IIC_SOFTC(minor(dev));
150 if (sc->sc_count > 0)
159 iicclose(struct cdev *dev, int flags, int fmt, struct thread *td)
161 struct iic_softc *sc = IIC_SOFTC(minor(dev));
171 if (sc->sc_count < 0)
172 panic("%s: iic_count < 0!", __func__);
178 iicwrite(struct cdev *dev, struct uio * uio, int ioflag)
180 device_t iicdev = IIC_DEVICE(minor(dev));
181 struct iic_softc *sc = IIC_SOFTC(minor(dev));
182 int sent, error, count;
184 if (!sc || !iicdev || !sc->sc_addr)
187 if (sc->sc_count == 0)
190 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
193 count = min(uio->uio_resid, BUFSIZE);
194 uiomove(sc->sc_buffer, count, uio);
196 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
197 sc->sc_buffer, count, &sent);
199 iicbus_release_bus(device_get_parent(iicdev), iicdev);
205 iicread(struct cdev *dev, struct uio * uio, int ioflag)
207 device_t iicdev = IIC_DEVICE(minor(dev));
208 struct iic_softc *sc = IIC_SOFTC(minor(dev));
212 if (!sc || !iicdev || !sc->sc_addr)
215 if (sc->sc_count == 0)
218 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev, IIC_DONTWAIT)))
221 /* max amount of data to read */
222 len = min(uio->uio_resid, BUFSIZE);
224 if ((error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
225 sc->sc_inbuf, len, &bufsize)))
228 if (bufsize > uio->uio_resid)
229 panic("%s: too much data read!", __func__);
231 iicbus_release_bus(device_get_parent(iicdev), iicdev);
233 return (uiomove(sc->sc_inbuf, bufsize, uio));
237 iicioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
239 device_t iicdev = IIC_DEVICE(minor(dev));
240 struct iic_softc *sc = IIC_SOFTC(minor(dev));
241 device_t parent = device_get_parent(iicdev);
242 struct iiccmd *s = (struct iiccmd *)data;
243 struct iic_rdwr_data *d = (struct iic_rdwr_data *)data;
247 void **usrbufs = NULL;
252 if ((error = iicbus_request_bus(parent, iicdev,
253 (flags & O_NONBLOCK) ? IIC_DONTWAIT : (IIC_WAIT | IIC_INTR))))
258 error = iicbus_start(parent, s->slave, 0);
261 * Implicitly set the chip addr to the slave addr passed as
262 * parameter. Consequently, start/stop shall be called before
263 * the read or the write of a block.
266 sc->sc_addr = s->slave;
271 error = iicbus_stop(parent);
275 error = iicbus_reset(parent, IIC_UNKNOWN, 0, NULL);
283 buf = malloc((unsigned long)s->count, M_TEMP, M_WAITOK);
284 error = copyin(s->buf, buf, s->count);
287 error = iicbus_write(parent, buf, s->count, &count, 10);
295 buf = malloc((unsigned long)s->count, M_TEMP, M_WAITOK);
296 error = iicbus_read(parent, buf, s->count, &count, s->last, 10);
299 error = copyout(buf, s->buf, s->count);
303 buf = malloc(sizeof(*d->msgs) * d->nmsgs, M_TEMP, M_WAITOK);
304 usrbufs = malloc(sizeof(void *) * d->nmsgs, M_TEMP, M_ZERO | M_WAITOK);
305 error = copyin(d->msgs, buf, sizeof(*d->msgs) * d->nmsgs);
308 /* Alloc kernel buffers for userland data, copyin write data */
309 for (i = 0; i < d->nmsgs; i++) {
310 m = &((struct iic_msg *)buf)[i];
312 m->buf = malloc(m->len, M_TEMP, M_WAITOK);
313 if (!(m->flags & IIC_M_RD))
314 copyin(usrbufs[i], m->buf, m->len);
316 error = iicbus_transfer(iicdev, (struct iic_msg *)buf, d->nmsgs);
317 /* Copyout all read segments, free up kernel buffers */
318 for (i = 0; i < d->nmsgs; i++) {
319 m = &((struct iic_msg *)buf)[i];
320 if (m->flags & IIC_M_RD)
321 copyout(m->buf, usrbufs[i], m->len);
322 free(m->buf, M_TEMP);
324 free(usrbufs, M_TEMP);
330 iicbus_release_bus(parent, iicdev);
337 DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);
338 MODULE_DEPEND(iic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
339 MODULE_VERSION(iic, 1);