1/*-
2 * Copyright (c) 1998, 2001 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
27#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 1998, 2001 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
27#include <sys/cdefs.h>
|
28__FBSDID("$FreeBSD: head/sys/dev/iicbus/iicbus.c 157827 2006-04-17 22:33:42Z jmg $");
| 28__FBSDID("$FreeBSD: head/sys/dev/iicbus/iicbus.c 160372 2006-07-14 23:15:06Z imp $");
|
29
30/*
31 * Autoconfiguration and support routines for the Philips serial I2C bus
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/kernel.h>
37#include <sys/module.h>
38#include <sys/bus.h>
39
40
41#include <dev/iicbus/iiconf.h>
42#include <dev/iicbus/iicbus.h>
43
44#include "iicbus_if.h"
45
46#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev))
47
| 29
30/*
31 * Autoconfiguration and support routines for the Philips serial I2C bus
32 */
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/kernel.h>
37#include <sys/module.h>
38#include <sys/bus.h>
39
40
41#include <dev/iicbus/iiconf.h>
42#include <dev/iicbus/iicbus.h>
43
44#include "iicbus_if.h"
45
46#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev))
47
|
48static devclass_t iicbus_devclass;
| 48devclass_t iicbus_devclass;
|
49
50/* See comments below for why auto-scanning is a bad idea. */
51#define SCAN_IICBUS 0
52
53/*
54 * Device methods
55 */
56static int iicbus_probe(device_t);
57static int iicbus_attach(device_t);
58static int iicbus_detach(device_t);
59static int iicbus_add_child(device_t dev, int order, const char *name, int unit);
60
61static device_method_t iicbus_methods[] = {
62 /* device interface */
63 DEVMETHOD(device_probe, iicbus_probe),
64 DEVMETHOD(device_attach, iicbus_attach),
65 DEVMETHOD(device_detach, iicbus_detach),
66
67 /* bus interface */
68 DEVMETHOD(bus_add_child, iicbus_add_child),
69 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
70 DEVMETHOD(bus_print_child, bus_generic_print_child),
71
72 { 0, 0 }
73};
74
| 49
50/* See comments below for why auto-scanning is a bad idea. */
51#define SCAN_IICBUS 0
52
53/*
54 * Device methods
55 */
56static int iicbus_probe(device_t);
57static int iicbus_attach(device_t);
58static int iicbus_detach(device_t);
59static int iicbus_add_child(device_t dev, int order, const char *name, int unit);
60
61static device_method_t iicbus_methods[] = {
62 /* device interface */
63 DEVMETHOD(device_probe, iicbus_probe),
64 DEVMETHOD(device_attach, iicbus_attach),
65 DEVMETHOD(device_detach, iicbus_detach),
66
67 /* bus interface */
68 DEVMETHOD(bus_add_child, iicbus_add_child),
69 DEVMETHOD(bus_driver_added, bus_generic_driver_added),
70 DEVMETHOD(bus_print_child, bus_generic_print_child),
71
72 { 0, 0 }
73};
74
|
75static driver_t iicbus_driver = {
| 75driver_t iicbus_driver = {
|
76 "iicbus",
77 iicbus_methods,
78 sizeof(struct iicbus_softc),
79};
80
81static int
82iicbus_probe(device_t dev)
83{
| 76 "iicbus",
77 iicbus_methods,
78 sizeof(struct iicbus_softc),
79};
80
81static int
82iicbus_probe(device_t dev)
83{
|
84 device_set_desc(dev, "Philips I2C bus");
| |
85
| 84
|
| 85 device_set_desc(dev, "Philips I2C bus");
|
86 return (0);
87}
88
89#if SCAN_IICBUS
90static int
91iic_probe_device(device_t dev, u_char addr)
92{
93 int count;
94 char byte;
95
96 if ((addr & 1) == 0) {
97 /* is device writable? */
98 if (!iicbus_start(dev, (u_char)addr, 0)) {
99 iicbus_stop(dev);
100 return (1);
101 }
102 } else {
103 /* is device readable? */
104 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count))
105 return (1);
106 }
107
108 return (0);
109}
110#endif
111
112/*
113 * We add all the devices which we know about.
114 * The generic attach routine will attach them if they are alive.
115 */
116static int
117iicbus_attach(device_t dev)
118{
119#if SCAN_IICBUS
120 unsigned char addr;
121#endif
122
123 iicbus_reset(dev, IIC_FASTEST, 0, NULL);
124
125 /* device probing is meaningless since the bus is supposed to be
126 * hot-plug. Moreover, some I2C chips do not appreciate random
127 * accesses like stop after start to fast, reads for less than
128 * x bytes...
129 */
130#if SCAN_IICBUS
131 printf("Probing for devices on iicbus%d:", device_get_unit(dev));
132
133 /* probe any devices */
134 for (addr = 16; addr < 240; addr++) {
135 if (iic_probe_device(dev, (u_char)addr)) {
136 printf(" <%x>", addr);
137 }
138 }
139 printf("\n");
140#endif
141
| 86 return (0);
87}
88
89#if SCAN_IICBUS
90static int
91iic_probe_device(device_t dev, u_char addr)
92{
93 int count;
94 char byte;
95
96 if ((addr & 1) == 0) {
97 /* is device writable? */
98 if (!iicbus_start(dev, (u_char)addr, 0)) {
99 iicbus_stop(dev);
100 return (1);
101 }
102 } else {
103 /* is device readable? */
104 if (!iicbus_block_read(dev, (u_char)addr, &byte, 1, &count))
105 return (1);
106 }
107
108 return (0);
109}
110#endif
111
112/*
113 * We add all the devices which we know about.
114 * The generic attach routine will attach them if they are alive.
115 */
116static int
117iicbus_attach(device_t dev)
118{
119#if SCAN_IICBUS
120 unsigned char addr;
121#endif
122
123 iicbus_reset(dev, IIC_FASTEST, 0, NULL);
124
125 /* device probing is meaningless since the bus is supposed to be
126 * hot-plug. Moreover, some I2C chips do not appreciate random
127 * accesses like stop after start to fast, reads for less than
128 * x bytes...
129 */
130#if SCAN_IICBUS
131 printf("Probing for devices on iicbus%d:", device_get_unit(dev));
132
133 /* probe any devices */
134 for (addr = 16; addr < 240; addr++) {
135 if (iic_probe_device(dev, (u_char)addr)) {
136 printf(" <%x>", addr);
137 }
138 }
139 printf("\n");
140#endif
141
|
142 /* attach any known device */
| |
143 device_add_child(dev, "ic", -1);
| 142 device_add_child(dev, "ic", -1);
|
144 device_add_child(dev, "iic", -1);
| |
145 device_add_child(dev, "iicsmb", -1);
| 143 device_add_child(dev, "iicsmb", -1);
|
146
| 144#if 0
145 /* attach any known device */
146 device_add_child(dev, "iic", -1);
147#endif
|
147 bus_generic_attach(dev);
| 148 bus_generic_attach(dev);
|
148
| |
149 return (0);
150}
151
152static int
153iicbus_detach(device_t dev)
154{
| 149 return (0);
150}
151
152static int
153iicbus_detach(device_t dev)
154{
|
| 155
|
155 iicbus_reset(dev, IIC_FASTEST, 0, NULL);
| 156 iicbus_reset(dev, IIC_FASTEST, 0, NULL);
|
156
| |
157 bus_generic_detach(dev);
| 157 bus_generic_detach(dev);
|
158
| |
159 return (0);
160}
161
162static int
163iicbus_add_child(device_t dev, int order, const char *name, int unit)
164{
| 158 return (0);
159}
160
161static int
162iicbus_add_child(device_t dev, int order, const char *name, int unit)
163{
|
165 device_add_child_ordered(dev, order, name, unit);
| |
166
| 164
|
| 165 device_add_child_ordered(dev, order, name, unit);
|
167 bus_generic_attach(dev);
| 166 bus_generic_attach(dev);
|
168
| |
169 return (0);
170}
171
172int
173iicbus_generic_intr(device_t dev, int event, char *buf)
174{
| 167 return (0);
168}
169
170int
171iicbus_generic_intr(device_t dev, int event, char *buf)
172{
|
| 173
|
175 return (0);
176}
177
178int
179iicbus_null_callback(device_t dev, int index, caddr_t data)
180{
| 174 return (0);
175}
176
177int
178iicbus_null_callback(device_t dev, int index, caddr_t data)
179{
|
| 180
|
181 return (0);
182}
183
184int
185iicbus_null_repeated_start(device_t dev, u_char addr)
186{
| 181 return (0);
182}
183
184int
185iicbus_null_repeated_start(device_t dev, u_char addr)
186{
|
| 187
|
187 return (IIC_ENOTSUPP);
188}
189
190DRIVER_MODULE(iicbus, envctrl, iicbus_driver, iicbus_devclass, 0, 0);
191DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0);
192MODULE_VERSION(iicbus, IICBUS_MODVER);
| 188 return (IIC_ENOTSUPP);
189}
190
191DRIVER_MODULE(iicbus, envctrl, iicbus_driver, iicbus_devclass, 0, 0);
192DRIVER_MODULE(iicbus, iicbb, iicbus_driver, iicbus_devclass, 0, 0);
193MODULE_VERSION(iicbus, IICBUS_MODVER);
|