2 i2c-sensor-detect.c - Part of lm_sensors, Linux kernel modules for hardware
4 Copyright (c) 1998 - 2001 Frodo Looijaard <frodol@dds.nl> and
5 Mark D. Studebaker <mdsxyz123@yahoo.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/config.h>
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/slab.h>
26 #include <linux/ctype.h>
27 #include <linux/sysctl.h>
28 #include <linux/init.h>
29 #include <linux/ioport.h>
30 #include <linux/i2c.h>
31 #include <linux/i2c-sensor.h>
32 #include <asm/uaccess.h>
35 /* Very inefficient for ISA detects, and won't work for 10-bit addresses! */
36 int i2c_detect(struct i2c_adapter
*adapter
,
37 struct i2c_address_data
*address_data
,
38 int (*found_proc
) (struct i2c_adapter
*, int, int))
40 int addr
, i
, found
, j
, err
;
41 struct i2c_force_data
*this_force
;
42 int is_isa
= i2c_is_isa_adapter(adapter
);
44 is_isa
? ANY_I2C_ISA_BUS
: i2c_adapter_id(adapter
);
46 /* Forget it if we can't probe using SMBUS_QUICK */
48 !i2c_check_functionality(adapter
, I2C_FUNC_SMBUS_QUICK
))
51 for (addr
= 0x00; addr
<= (is_isa
? 0xffff : 0x7f); addr
++) {
52 if (!is_isa
&& i2c_check_addr(adapter
, addr
))
55 /* If it is in one of the force entries, we don't do any
58 for (i
= 0; !found
&& (this_force
= address_data
->forces
+ i
, this_force
->force
); i
++) {
59 for (j
= 0; !found
&& (this_force
->force
[j
] != I2C_CLIENT_END
); j
+= 2) {
60 if ( ((adapter_id
== this_force
->force
[j
]) ||
61 ((this_force
->force
[j
] == ANY_I2C_BUS
) && !is_isa
)) &&
62 (addr
== this_force
->force
[j
+ 1]) ) {
63 dev_dbg(&adapter
->dev
, "found force parameter for adapter %d, addr %04x\n", adapter_id
, addr
);
64 if ((err
= found_proc(adapter
, addr
, this_force
->kind
)))
73 /* If this address is in one of the ignores, we can forget about it
75 for (i
= 0; !found
&& (address_data
->ignore
[i
] != I2C_CLIENT_END
); i
+= 2) {
76 if ( ((adapter_id
== address_data
->ignore
[i
]) ||
77 ((address_data
->ignore
[i
] == ANY_I2C_BUS
) &&
79 (addr
== address_data
->ignore
[i
+ 1])) {
80 dev_dbg(&adapter
->dev
, "found ignore parameter for adapter %d, addr %04x\n", adapter_id
, addr
);
84 for (i
= 0; !found
&& (address_data
->ignore_range
[i
] != I2C_CLIENT_END
); i
+= 3) {
85 if ( ((adapter_id
== address_data
->ignore_range
[i
]) ||
86 ((address_data
-> ignore_range
[i
] == ANY_I2C_BUS
) &
88 (addr
>= address_data
->ignore_range
[i
+ 1]) &&
89 (addr
<= address_data
->ignore_range
[i
+ 2])) {
90 dev_dbg(&adapter
->dev
, "found ignore_range parameter for adapter %d, addr %04x\n", adapter_id
, addr
);
97 /* Now, we will do a detection, but only if it is in the normal or
100 for (i
= 0; !found
&& (address_data
->normal_isa
[i
] != I2C_CLIENT_ISA_END
); i
+= 1) {
101 if (addr
== address_data
->normal_isa
[i
]) {
102 dev_dbg(&adapter
->dev
, "found normal isa entry for adapter %d, addr %04x\n", adapter_id
, addr
);
106 for (i
= 0; !found
&& (address_data
->normal_isa_range
[i
] != I2C_CLIENT_ISA_END
); i
+= 3) {
107 if ((addr
>= address_data
->normal_isa_range
[i
]) &&
108 (addr
<= address_data
->normal_isa_range
[i
+ 1]) &&
109 ((addr
- address_data
->normal_isa_range
[i
]) % address_data
->normal_isa_range
[i
+ 2] == 0)) {
110 dev_dbg(&adapter
->dev
, "found normal isa_range entry for adapter %d, addr %04x", adapter_id
, addr
);
115 for (i
= 0; !found
&& (address_data
->normal_i2c
[i
] != I2C_CLIENT_END
); i
+= 1) {
116 if (addr
== address_data
->normal_i2c
[i
]) {
118 dev_dbg(&adapter
->dev
, "found normal i2c entry for adapter %d, addr %02x", adapter_id
, addr
);
121 for (i
= 0; !found
&& (address_data
->normal_i2c_range
[i
] != I2C_CLIENT_END
); i
+= 2) {
122 if ((addr
>= address_data
->normal_i2c_range
[i
]) &&
123 (addr
<= address_data
->normal_i2c_range
[i
+ 1])) {
124 dev_dbg(&adapter
->dev
, "found normal i2c_range entry for adapter %d, addr %04x\n", adapter_id
, addr
);
131 !found
&& (address_data
->probe
[i
] != I2C_CLIENT_END
);
133 if (((adapter_id
== address_data
->probe
[i
]) ||
135 probe
[i
] == ANY_I2C_BUS
) && !is_isa
))
136 && (addr
== address_data
->probe
[i
+ 1])) {
137 dev_dbg(&adapter
->dev
, "found probe parameter for adapter %d, addr %04x\n", adapter_id
, addr
);
141 for (i
= 0; !found
&& (address_data
->probe_range
[i
] != I2C_CLIENT_END
); i
+= 3) {
142 if ( ((adapter_id
== address_data
->probe_range
[i
]) ||
143 ((address_data
->probe_range
[i
] == ANY_I2C_BUS
) && !is_isa
)) &&
144 (addr
>= address_data
->probe_range
[i
+ 1]) &&
145 (addr
<= address_data
->probe_range
[i
+ 2])) {
147 dev_dbg(&adapter
->dev
, "found probe_range parameter for adapter %d, addr %04x\n", adapter_id
, addr
);
153 /* OK, so we really should examine this address. First check
154 whether there is some client here at all! */
156 (i2c_smbus_xfer (adapter
, addr
, 0, 0, 0, I2C_SMBUS_QUICK
, NULL
) >= 0))
157 if ((err
= found_proc(adapter
, addr
, -1)))
163 EXPORT_SYMBOL(i2c_detect
);
165 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
166 "Rudolf Marek <r.marek@sh.cvut.cz>");
168 MODULE_DESCRIPTION("i2c-sensor driver");
169 MODULE_LICENSE("GPL");