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
26 * $FreeBSD: src/sys/dev/iicbus/iic.c,v 1.43 2009/01/26 13:53:39 raj Exp $
27 * $DragonFly: src/sys/bus/iicbus/iic.c,v 1.10 2006/09/10 01:26:32 dillon Exp $
30 #include <sys/param.h>
34 #include <sys/fcntl.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/systm.h>
41 #include <bus/iicbus/iiconf.h>
42 #include <bus/iicbus/iicbus.h>
43 #include <bus/iicbus/iic.h>
45 #include "iicbus_if.h"
52 u_char sc_addr; /* 7 bit address on iicbus */
53 int sc_count; /* >0 if device opened */
55 char sc_buffer[BUFSIZE]; /* output buffer */
56 char sc_inbuf[BUFSIZE]; /* input buffer */
62 #define IIC_UNLOCK(sc)
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 dev_ops iic_ops = {
106 iic_identify(driver_t *driver, device_t parent)
109 if (device_find_child(parent, "iic", -1) == NULL)
110 BUS_ADD_CHILD(parent, parent, 0, "iic", -1);
114 iic_probe(device_t dev)
116 if (iicbus_get_addr(dev) > 0)
119 device_set_desc(dev, "I2C generic I/O");
125 iic_attach(device_t dev)
127 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
129 sc->sc_devnode = make_dev(&iic_ops, device_get_unit(dev),
131 0600, "iic%d", device_get_unit(dev));
132 if (sc->sc_devnode == NULL) {
133 device_printf(dev, "failed to create character device\n");
136 sc->sc_devnode->si_drv1 = sc;
142 iic_detach(device_t dev)
144 struct iic_softc *sc = (struct iic_softc *)device_get_softc(dev);
147 dev_ops_remove_minor(&iic_ops, device_get_unit(dev));
153 iicopen(struct dev_open_args *ap)
155 cdev_t dev = ap->a_head.a_dev;
156 struct iic_softc *sc = dev->si_drv1;
159 if (sc->sc_count > 0) {
171 iicclose(struct dev_close_args *ap)
173 cdev_t dev = ap->a_head.a_dev;
174 struct iic_softc *sc = dev->si_drv1;
178 /* XXX: I don't think this can happen. */
185 if (sc->sc_count < 0)
186 panic("%s: iic_count < 0!", __func__);
193 iicwrite(struct dev_write_args *ap)
195 cdev_t dev = ap->a_head.a_dev;
196 struct uio *uio = ap->a_uio;
197 struct iic_softc *sc = dev->si_drv1;
198 device_t iicdev = sc->sc_dev;
199 int sent, error, count;
207 if (sc->sc_count == 0) {
208 /* XXX: I don't think this can happen. */
213 error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
220 count = (int)szmin(uio->uio_resid, BUFSIZE);
221 uiomove(sc->sc_buffer, (size_t)count, uio);
223 error = iicbus_block_write(device_get_parent(iicdev), sc->sc_addr,
224 sc->sc_buffer, count, &sent);
226 iicbus_release_bus(device_get_parent(iicdev), iicdev);
233 iicread(struct dev_read_args *ap)
235 cdev_t dev = ap->a_head.a_dev;
236 struct uio *uio = ap->a_uio;
237 struct iic_softc *sc = dev->si_drv1;
238 device_t iicdev = sc->sc_dev;
248 if (sc->sc_count == 0) {
249 /* XXX: I don't think this can happen. */
254 error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
261 /* max amount of data to read */
262 len = (int)szmin(uio->uio_resid, BUFSIZE);
264 error = iicbus_block_read(device_get_parent(iicdev), sc->sc_addr,
265 sc->sc_inbuf, len, &bufsize);
271 if (bufsize > uio->uio_resid)
272 panic("%s: too much data read!", __func__);
274 iicbus_release_bus(device_get_parent(iicdev), iicdev);
276 error = uiomove(sc->sc_inbuf, (size_t)bufsize, uio);
282 iicioctl(struct dev_ioctl_args *ap)
284 cdev_t dev = ap->a_head.a_dev;
285 u_long cmd = ap->a_cmd;
286 caddr_t data = ap->a_data;
287 int flags = ap->a_fflag;
288 struct iic_softc *sc = dev->si_drv1;
289 device_t iicdev = sc->sc_dev;
290 device_t parent = device_get_parent(iicdev);
291 struct iiccmd *s = (struct iiccmd *)data;
292 struct iic_rdwr_data *d = (struct iic_rdwr_data *)data;
296 void **usrbufs = NULL;
298 if ((error = iicbus_request_bus(device_get_parent(iicdev), iicdev,
299 (flags & O_NONBLOCK) ? IIC_DONTWAIT :
300 (IIC_WAIT | IIC_INTR))))
306 error = iicbus_start(parent, s->slave, 0);
309 * Implicitly set the chip addr to the slave addr passed as
310 * parameter. Consequently, start/stop shall be called before
311 * the read or the write of a block.
314 sc->sc_addr = s->slave;
320 error = iicbus_stop(parent);
324 error = iicbus_reset(parent, IIC_UNKNOWN, 0, NULL);
332 buf = kmalloc((unsigned long)s->count, M_TEMP, M_WAITOK);
333 error = copyin(s->buf, buf, s->count);
336 error = iicbus_write(parent, buf, s->count, &count, 10);
344 buf = kmalloc((unsigned long)s->count, M_TEMP, M_WAITOK);
345 error = iicbus_read(parent, buf, s->count, &count, s->last, 10);
348 error = copyout(buf, s->buf, s->count);
352 buf = kmalloc(sizeof(*d->msgs) * d->nmsgs, M_TEMP, M_WAITOK);
353 usrbufs = kmalloc(sizeof(void *) * d->nmsgs, M_TEMP, M_ZERO | M_WAITOK);
354 error = copyin(d->msgs, buf, sizeof(*d->msgs) * d->nmsgs);
357 /* Alloc kernel buffers for userland data, copyin write data */
358 for (i = 0; i < d->nmsgs; i++) {
359 m = &((struct iic_msg *)buf)[i];
361 m->buf = kmalloc(m->len, M_TEMP, M_WAITOK);
362 if (!(m->flags & IIC_M_RD))
363 copyin(usrbufs[i], m->buf, m->len);
365 error = iicbus_transfer(parent, (struct iic_msg *)buf, d->nmsgs);
366 /* Copyout all read segments, free up kernel buffers */
367 for (i = 0; i < d->nmsgs; i++) {
368 m = &((struct iic_msg *)buf)[i];
369 if (m->flags & IIC_M_RD)
370 copyout(m->buf, usrbufs[i], m->len);
371 kfree(m->buf, M_TEMP);
373 kfree(usrbufs, M_TEMP);
377 error = iicbus_repeated_start(parent, s->slave, 0);
384 iicbus_release_bus(device_get_parent(iicdev), iicdev);
391 DRIVER_MODULE(iic, iicbus, iic_driver, iic_devclass, 0, 0);
392 MODULE_DEPEND(iic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
393 MODULE_VERSION(iic, 1);