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>
34 static unsigned short empty[] = {I2C_CLIENT_END};
35 static unsigned int empty_isa[] = {I2C_CLIENT_ISA_END};
37 /* Very inefficient for ISA detects, and won't work for 10-bit addresses! */
38 int i2c_detect(struct i2c_adapter *adapter,
39 struct i2c_address_data *address_data,
40 int (*found_proc) (struct i2c_adapter *, int, int))
42 int addr, i, found, j, err;
43 struct i2c_force_data *this_force;
44 int is_isa = i2c_is_isa_adapter(adapter);
46 is_isa ? ANY_I2C_ISA_BUS : i2c_adapter_id(adapter);
47 unsigned short *normal_i2c;
48 unsigned int *normal_isa;
49 unsigned short *probe;
50 unsigned short *ignore;
52 /* Forget it if we can't probe using SMBUS_QUICK */
54 !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK))
57 /* Use default "empty" list if the adapter doesn't specify any */
58 normal_i2c = probe = ignore = empty;
59 normal_isa = empty_isa;
60 if (address_data->normal_i2c)
61 normal_i2c = address_data->normal_i2c;
62 if (address_data->normal_isa)
63 normal_isa = address_data->normal_isa;
64 if (address_data->probe)
65 probe = address_data->probe;
66 if (address_data->ignore)
67 ignore = address_data->ignore;
69 for (addr = 0x00; addr <= (is_isa ? 0xffff : 0x7f); addr++) {
70 if (!is_isa && i2c_check_addr(adapter, addr))
73 /* If it is in one of the force entries, we don't do any
76 for (i = 0; !found && (this_force = address_data->forces + i, this_force->force); i++) {
77 for (j = 0; !found && (this_force->force[j] != I2C_CLIENT_END); j += 2) {
78 if ( ((adapter_id == this_force->force[j]) ||
79 ((this_force->force[j] == ANY_I2C_BUS) && !is_isa)) &&
80 (addr == this_force->force[j + 1]) ) {
81 dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n", adapter_id, addr);
82 if ((err = found_proc(adapter, addr, this_force->kind)))
91 /* If this address is in one of the ignores, we can forget about it
93 for (i = 0; !found && (ignore[i] != I2C_CLIENT_END); i += 2) {
94 if ( ((adapter_id == ignore[i]) ||
95 ((ignore[i] == ANY_I2C_BUS) &&
97 (addr == ignore[i + 1])) {
98 dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, addr %04x\n", adapter_id, addr);
105 /* Now, we will do a detection, but only if it is in the normal or
108 for (i = 0; !found && (normal_isa[i] != I2C_CLIENT_ISA_END); i += 1) {
109 if (addr == normal_isa[i]) {
110 dev_dbg(&adapter->dev, "found normal isa entry for adapter %d, addr %04x\n", adapter_id, addr);
115 for (i = 0; !found && (normal_i2c[i] != I2C_CLIENT_END); i += 1) {
116 if (addr == normal_i2c[i]) {
118 dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, addr %02x\n", adapter_id, addr);
124 !found && (probe[i] != I2C_CLIENT_END);
126 if (((adapter_id == probe[i]) ||
127 ((probe[i] == ANY_I2C_BUS) && !is_isa))
128 && (addr == probe[i + 1])) {
129 dev_dbg(&adapter->dev, "found probe parameter for adapter %d, addr %04x\n", adapter_id, addr);
136 /* OK, so we really should examine this address. First check
137 whether there is some client here at all! */
139 (i2c_smbus_xfer (adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) >= 0))
140 if ((err = found_proc(adapter, addr, -1)))
146 EXPORT_SYMBOL(i2c_detect);
148 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
149 "Rudolf Marek <r.marek@sh.cvut.cz>");
151 MODULE_DESCRIPTION("i2c-sensor driver");
152 MODULE_LICENSE("GPL");