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/module.h>
23 #include <linux/kernel.h>
24 #include <linux/i2c.h>
25 #include <linux/i2c-sensor.h>
27 static unsigned short empty[] = {I2C_CLIENT_END};
29 /* Won't work for 10-bit addresses! */
30 int i2c_detect(struct i2c_adapter *adapter,
31 struct i2c_address_data *address_data,
32 int (*found_proc) (struct i2c_adapter *, int, int))
34 int addr, i, found, j, err;
35 struct i2c_force_data *this_force;
36 int adapter_id = i2c_adapter_id(adapter);
37 unsigned short *normal_i2c;
38 unsigned short *probe;
39 unsigned short *ignore;
41 /* Forget it if we can't probe using SMBUS_QUICK */
42 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK))
45 /* Use default "empty" list if the adapter doesn't specify any */
46 normal_i2c = probe = ignore = empty;
47 if (address_data->normal_i2c)
48 normal_i2c = address_data->normal_i2c;
49 if (address_data->probe)
50 probe = address_data->probe;
51 if (address_data->ignore)
52 ignore = address_data->ignore;
54 for (addr = 0x00; addr <= 0x7f; addr++) {
55 if (i2c_check_addr(adapter, addr))
58 /* If it is in one of the force entries, we don't do any
61 for (i = 0; !found && (this_force = address_data->forces + i, this_force->force); i++) {
62 for (j = 0; !found && (this_force->force[j] != I2C_CLIENT_END); j += 2) {
63 if ( ((adapter_id == this_force->force[j]) ||
64 (this_force->force[j] == ANY_I2C_BUS)) &&
65 (addr == this_force->force[j + 1]) ) {
66 dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n", adapter_id, addr);
67 if ((err = found_proc(adapter, addr, this_force->kind)))
76 /* If this address is in one of the ignores, we can forget about it
78 for (i = 0; !found && (ignore[i] != I2C_CLIENT_END); i += 2) {
79 if ( ((adapter_id == ignore[i]) ||
80 (ignore[i] == ANY_I2C_BUS)) &&
81 (addr == ignore[i + 1])) {
82 dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, addr %04x\n", adapter_id, addr);
89 /* Now, we will do a detection, but only if it is in the normal or
91 for (i = 0; !found && (normal_i2c[i] != I2C_CLIENT_END); i += 1) {
92 if (addr == normal_i2c[i]) {
94 dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, addr %02x\n", adapter_id, addr);
99 !found && (probe[i] != I2C_CLIENT_END);
101 if (((adapter_id == probe[i]) ||
102 (probe[i] == ANY_I2C_BUS))
103 && (addr == probe[i + 1])) {
104 dev_dbg(&adapter->dev, "found probe parameter for adapter %d, addr %04x\n", adapter_id, addr);
111 /* OK, so we really should examine this address. First check
112 whether there is some client here at all! */
113 if (i2c_smbus_xfer(adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) >= 0)
114 if ((err = found_proc(adapter, addr, -1)))
120 EXPORT_SYMBOL(i2c_detect);
122 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
123 "Rudolf Marek <r.marek@sh.cvut.cz>");
125 MODULE_DESCRIPTION("i2c-sensor driver");
126 MODULE_LICENSE("GPL");