diff options
Diffstat (limited to 'drivers/i2c/i2c-sensor-detect.c')
| -rw-r--r-- | drivers/i2c/i2c-sensor-detect.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-sensor-detect.c b/drivers/i2c/i2c-sensor-detect.c new file mode 100644 index 000000000000..f99a8161a9f1 --- /dev/null +++ b/drivers/i2c/i2c-sensor-detect.c @@ -0,0 +1,145 @@ +/* + i2c-sensor-detect.c - Part of lm_sensors, Linux kernel modules for hardware + monitoring + Copyright (c) 1998 - 2001 Frodo Looijaard <frodol@dds.nl> and + Mark D. Studebaker <mdsxyz123@yahoo.com> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/i2c.h> +#include <linux/i2c-sensor.h> + +static unsigned short empty[] = {I2C_CLIENT_END}; +static unsigned int empty_isa[] = {I2C_CLIENT_ISA_END}; + +/* Very inefficient for ISA detects, and won't work for 10-bit addresses! */ +int i2c_detect(struct i2c_adapter *adapter, + struct i2c_address_data *address_data, + int (*found_proc) (struct i2c_adapter *, int, int)) +{ + int addr, i, found, j, err; + struct i2c_force_data *this_force; + int is_isa = i2c_is_isa_adapter(adapter); + int adapter_id = + is_isa ? ANY_I2C_ISA_BUS : i2c_adapter_id(adapter); + unsigned short *normal_i2c; + unsigned int *normal_isa; + unsigned short *probe; + unsigned short *ignore; + + /* Forget it if we can't probe using SMBUS_QUICK */ + if ((!is_isa) && + !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) + return -1; + + /* Use default "empty" list if the adapter doesn't specify any */ + normal_i2c = probe = ignore = empty; + normal_isa = empty_isa; + if (address_data->normal_i2c) + normal_i2c = address_data->normal_i2c; + if (address_data->normal_isa) + normal_isa = address_data->normal_isa; + if (address_data->probe) + probe = address_data->probe; + if (address_data->ignore) + ignore = address_data->ignore; + + for (addr = 0x00; addr <= (is_isa ? 0xffff : 0x7f); addr++) { + if (!is_isa && i2c_check_addr(adapter, addr)) + continue; + + /* If it is in one of the force entries, we don't do any + detection at all */ + found = 0; + for (i = 0; !found && (this_force = address_data->forces + i, this_force->force); i++) { + for (j = 0; !found && (this_force->force[j] != I2C_CLIENT_END); j += 2) { + if ( ((adapter_id == this_force->force[j]) || + ((this_force->force[j] == ANY_I2C_BUS) && !is_isa)) && + (addr == this_force->force[j + 1]) ) { + dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n", adapter_id, addr); + if ((err = found_proc(adapter, addr, this_force->kind))) + return err; + found = 1; + } + } + } + if (found) + continue; + + /* If this address is in one of the ignores, we can forget about it + right now */ + for (i = 0; !found && (ignore[i] != I2C_CLIENT_END); i += 2) { + if ( ((adapter_id == ignore[i]) || + ((ignore[i] == ANY_I2C_BUS) && + !is_isa)) && + (addr == ignore[i + 1])) { + dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, addr %04x\n", adapter_id, addr); + found = 1; + } + } + if (found) + continue; + + /* Now, we will do a detection, but only if it is in the normal or + probe entries */ + if (is_isa) { + for (i = 0; !found && (normal_isa[i] != I2C_CLIENT_ISA_END); i += 1) { + if (addr == normal_isa[i]) { + dev_dbg(&adapter->dev, "found normal isa entry for adapter %d, addr %04x\n", adapter_id, addr); + found = 1; + } + } + } else { + for (i = 0; !found && (normal_i2c[i] != I2C_CLIENT_END); i += 1) { + if (addr == normal_i2c[i]) { + found = 1; + dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, addr %02x\n", adapter_id, addr); + } + } + } + + for (i = 0; + !found && (probe[i] != I2C_CLIENT_END); + i += 2) { + if (((adapter_id == probe[i]) || + ((probe[i] == ANY_I2C_BUS) && !is_isa)) + && (addr == probe[i + 1])) { + dev_dbg(&adapter->dev, "found probe parameter for adapter %d, addr %04x\n", adapter_id, addr); + found = 1; + } + } + if (!found) + continue; + + /* OK, so we really should examine this address. First check + whether there is some client here at all! */ + if (is_isa || + (i2c_smbus_xfer (adapter, addr, 0, 0, 0, I2C_SMBUS_QUICK, NULL) >= 0)) + if ((err = found_proc(adapter, addr, -1))) + return err; + } + return 0; +} + +EXPORT_SYMBOL(i2c_detect); + +MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, " + "Rudolf Marek <r.marek@sh.cvut.cz>"); + +MODULE_DESCRIPTION("i2c-sensor driver"); +MODULE_LICENSE("GPL"); |