146 lines
4.7 KiB
C
146 lines
4.7 KiB
C
/*
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i2c-sensor-detect.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 1998 - 2001 Frodo Looijaard <frodol@dds.nl> and
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Mark D. Studebaker <mdsxyz123@yahoo.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/i2c-sensor.h>
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static unsigned short empty[] = {I2C_CLIENT_END};
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static unsigned int empty_isa[] = {I2C_CLIENT_ISA_END};
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/* Very inefficient for ISA detects, and won't work for 10-bit addresses! */
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int i2c_detect(struct i2c_adapter *adapter,
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struct i2c_address_data *address_data,
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int (*found_proc) (struct i2c_adapter *, int, int))
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{
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int addr, i, found, j, err;
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struct i2c_force_data *this_force;
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int is_isa = i2c_is_isa_adapter(adapter);
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int adapter_id =
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is_isa ? ANY_I2C_ISA_BUS : i2c_adapter_id(adapter);
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unsigned short *normal_i2c;
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unsigned int *normal_isa;
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unsigned short *probe;
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unsigned short *ignore;
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/* Forget it if we can't probe using SMBUS_QUICK */
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if ((!is_isa) &&
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!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK))
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return -1;
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/* Use default "empty" list if the adapter doesn't specify any */
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normal_i2c = probe = ignore = empty;
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normal_isa = empty_isa;
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if (address_data->normal_i2c)
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normal_i2c = address_data->normal_i2c;
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if (address_data->normal_isa)
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normal_isa = address_data->normal_isa;
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if (address_data->probe)
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probe = address_data->probe;
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if (address_data->ignore)
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ignore = address_data->ignore;
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for (addr = 0x00; addr <= (is_isa ? 0xffff : 0x7f); addr++) {
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if (!is_isa && i2c_check_addr(adapter, addr))
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continue;
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/* If it is in one of the force entries, we don't do any
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detection at all */
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found = 0;
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for (i = 0; !found && (this_force = address_data->forces + i, this_force->force); i++) {
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for (j = 0; !found && (this_force->force[j] != I2C_CLIENT_END); j += 2) {
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if ( ((adapter_id == this_force->force[j]) ||
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((this_force->force[j] == ANY_I2C_BUS) && !is_isa)) &&
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(addr == this_force->force[j + 1]) ) {
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dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n", adapter_id, addr);
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if ((err = found_proc(adapter, addr, this_force->kind)))
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return err;
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found = 1;
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}
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}
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}
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if (found)
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continue;
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/* If this address is in one of the ignores, we can forget about it
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right now */
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for (i = 0; !found && (ignore[i] != I2C_CLIENT_END); i += 2) {
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if ( ((adapter_id == ignore[i]) ||
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((ignore[i] == ANY_I2C_BUS) &&
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!is_isa)) &&
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(addr == ignore[i + 1])) {
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dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, addr %04x\n", adapter_id, addr);
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found = 1;
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}
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}
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if (found)
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continue;
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/* Now, we will do a detection, but only if it is in the normal or
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probe entries */
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if (is_isa) {
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for (i = 0; !found && (normal_isa[i] != I2C_CLIENT_ISA_END); i += 1) {
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if (addr == normal_isa[i]) {
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dev_dbg(&adapter->dev, "found normal isa entry for adapter %d, addr %04x\n", adapter_id, addr);
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found = 1;
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}
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}
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} else {
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for (i = 0; !found && (normal_i2c[i] != I2C_CLIENT_END); i += 1) {
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if (addr == normal_i2c[i]) {
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found = 1;
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dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, addr %02x\n", adapter_id, addr);
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}
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}
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}
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for (i = 0;
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!found && (probe[i] != I2C_CLIENT_END);
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i += 2) {
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if (((adapter_id == probe[i]) ||
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((probe[i] == ANY_I2C_BUS) && !is_isa))
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&& (addr == probe[i + 1])) {
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dev_dbg(&adapter->dev, "found probe parameter for adapter %d, addr %04x\n", adapter_id, addr);
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found = 1;
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}
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}
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if (!found)
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continue;
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/* OK, so we really should examine this address. First check
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whether there is some client here at all! */
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if (is_isa ||
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(i2c_smbus_xfer (adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) >= 0))
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if ((err = found_proc(adapter, addr, -1)))
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return err;
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}
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return 0;
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}
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EXPORT_SYMBOL(i2c_detect);
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MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
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"Rudolf Marek <r.marek@sh.cvut.cz>");
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MODULE_DESCRIPTION("i2c-sensor driver");
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MODULE_LICENSE("GPL");
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