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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
31 * Autoconfiguration and support routines for the Philips serial I2C bus
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
41 #include <dev/iicbus/iiconf.h>
42 #include <dev/iicbus/iicbus.h>
44 #include "iicbus_if.h"
46 /* See comments below for why auto-scanning is a bad idea. */
50 iicbus_probe(device_t dev)
53 device_set_desc(dev, "Philips I2C bus");
59 iic_probe_device(device_t dev, u_char addr)
64 if ((addr & 1) == 0) {
65 /* is device writable? */
66 if (!iicbus_start(dev, (u_char)addr, 0)) {
71 /* is device readable? */
72 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count))
81 * We add all the devices which we know about.
82 * The generic attach routine will attach them if they are alive.
85 iicbus_attach(device_t dev)
90 struct iicbus_softc *sc = IICBUS_SOFTC(dev);
93 iicbus_reset(dev, IIC_FASTEST, 0, NULL);
95 /* device probing is meaningless since the bus is supposed to be
96 * hot-plug. Moreover, some I2C chips do not appreciate random
97 * accesses like stop after start to fast, reads for less than
101 printf("Probing for devices on iicbus%d:", device_get_unit(dev));
103 /* probe any devices */
104 for (addr = 16; addr < 240; addr++) {
105 if (iic_probe_device(dev, (u_char)addr)) {
106 printf(" <%x>", addr);
111 /* Always attach the iicsmb children */
112 BUS_ADD_CHILD(dev, 0, "iicsmb", -1);
113 /* attach any known device */
114 BUS_ADD_CHILD(dev, 0, "iic", -1);
115 /* Attach the wired devices via hints */
116 bus_enumerate_hinted_children(dev);
117 /* Now probe and attach them */
118 bus_generic_attach(dev);
123 iicbus_detach(device_t dev)
126 iicbus_reset(dev, IIC_FASTEST, 0, NULL);
127 bus_generic_detach(dev);
132 iicbus_print_child(device_t dev, device_t child)
134 struct iicbus_ivar *devi = IICBUS_IVAR(child);
137 retval += bus_print_child_header(dev, child);
139 retval += printf(" at addr %#x", devi->addr);
140 retval += bus_print_child_footer(dev, child);
146 iicbus_probe_nomatch(device_t bus, device_t child)
148 struct iicbus_ivar *devi = IICBUS_IVAR(child);
150 device_printf(bus, "<unknown card>");
151 printf(" at addr %#x\n", devi->addr);
156 iicbus_child_location_str(device_t bus, device_t child, char *buf,
159 struct iicbus_ivar *devi = IICBUS_IVAR(child);
161 snprintf(buf, buflen, "addr=%#x", devi->addr);
166 iicbus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
174 iicbus_read_ivar(device_t bus, device_t child, int which, u_char *result)
176 struct iicbus_ivar *devi = IICBUS_IVAR(child);
181 case IICBUS_IVAR_ADDR:
182 *(uint32_t *)result = devi->addr;
189 iicbus_add_child(device_t dev, int order, const char *name, int unit)
192 struct iicbus_ivar *devi;
194 child = device_add_child_ordered(dev, order, name, unit);
197 devi = malloc(sizeof(struct iicbus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
199 device_delete_child(dev, child);
202 device_set_ivars(child, devi);
207 iicbus_hinted_child(device_t bus, const char *dname, int dunit)
210 struct iicbus_ivar *devi;
212 child = BUS_ADD_CHILD(bus, 0, dname, dunit);
213 devi = IICBUS_IVAR(child);
214 resource_int_value(dname, dunit, "addr", &devi->addr);
218 iicbus_generic_intr(device_t dev, int event, char *buf)
225 iicbus_null_callback(device_t dev, int index, caddr_t data)
232 iicbus_null_repeated_start(device_t dev, u_char addr)
235 return (IIC_ENOTSUPP);
238 static device_method_t iicbus_methods[] = {
239 /* device interface */
240 DEVMETHOD(device_probe, iicbus_probe),
241 DEVMETHOD(device_attach, iicbus_attach),
242 DEVMETHOD(device_detach, iicbus_detach),
245 DEVMETHOD(bus_add_child, iicbus_add_child),
246 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
247 DEVMETHOD(bus_print_child, iicbus_print_child),
248 DEVMETHOD(bus_probe_nomatch, iicbus_probe_nomatch),
249 DEVMETHOD(bus_read_ivar, iicbus_read_ivar),
250 DEVMETHOD(bus_child_pnpinfo_str, iicbus_child_pnpinfo_str),
251 DEVMETHOD(bus_child_location_str, iicbus_child_location_str),
252 DEVMETHOD(bus_hinted_child, iicbus_hinted_child),
254 /* iicbus interface */
255 DEVMETHOD(iicbus_transfer, iicbus_transfer),
260 driver_t iicbus_driver = {
263 sizeof(struct iicbus_softc),
266 devclass_t iicbus_devclass;
268 DRIVER_MODULE(iicbus, envctrl, iicbus_driver, iicbus_devclass, 0, 0);
269 DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0);
270 MODULE_VERSION(iicbus, IICBUS_MODVER);