i2c-sensor.h

Axis 221 camera embedded programing interface

/*
    i2c-sensor.h - Part of the i2c package
    was originally sensors.h - Part of lm_sensors, Linux kernel modules
                               for hardware monitoring
    Copyright (c) 1998, 1999  Frodo Looijaard <[e-mail]>

    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.
*/

#ifndef _LINUX_I2C_SENSOR_H
#define _LINUX_I2C_SENSOR_H

/* A structure containing detect information.
   Force variables overrule all other variables; they force a detection on
   that place. If a specific chip is given, the module blindly assumes this
   chip type is present; if a general force (kind == 0) is given, the module
   will still try to figure out what type of chip is present. This is useful
   if for some reasons the detect for SMBus or ISA address space filled
   fails.
   probe: insmod parameter. Initialize this list with I2C_CLIENT_ISA_END values.
     A list of pairs. The first value is a bus number (ANY_I2C_ISA_BUS for
     the ISA bus, -1 for any I2C bus), the second is the address. 
   kind: The kind of chip. 0 equals any chip.
*/
struct i2c_force_data {
	unsigned short *force;
	unsigned short kind;
};

/* A structure containing the detect information.
   normal_i2c: filled in by the module writer. Terminated by I2C_CLIENT_ISA_END.
     A list of I2C addresses which should normally be examined.
   normal_isa: filled in by the module writer. Terminated by SENSORS_ISA_END.
     A list of ISA addresses which should normally be examined.
   probe: insmod parameter. Initialize this list with I2C_CLIENT_ISA_END values.
     A list of pairs. The first value is a bus number (ANY_I2C_ISA_BUS for
     the ISA bus, -1 for any I2C bus), the second is the address. These
     addresses are also probed, as if they were in the 'normal' list.
   ignore: insmod parameter. Initialize this list with I2C_CLIENT_ISA_END values.
     A list of pairs. The first value is a bus number (ANY_I2C_ISA_BUS for
     the ISA bus, -1 for any I2C bus), the second is the I2C address. These
     addresses are never probed. This parameter overrules 'normal' and 
     'probe', but not the 'force' lists.
   force_data: insmod parameters. A list, ending with an element of which
     the force field is NULL.
*/
struct i2c_address_data {
	unsigned short *normal_i2c;
	unsigned int *normal_isa;
	unsigned short *probe;
	unsigned short *ignore;
	struct i2c_force_data *forces;
};

#define SENSORS_MODULE_PARM_FORCE(name) \
  I2C_CLIENT_MODULE_PARM(force_ ## name, \
                      "List of adapter,address pairs which are unquestionably" \
                      " assumed to contain a `" # name "' chip")


/* This defines several insmod variables, and the addr_data structure */
#define SENSORS_INSMOD \
  I2C_CLIENT_MODULE_PARM(probe, \
                      "List of adapter,address pairs to scan additionally"); \
  I2C_CLIENT_MODULE_PARM(ignore, \
                      "List of adapter,address pairs not to scan"); \
	static struct i2c_address_data addr_data = {			\
			.normal_i2c =		normal_i2c,		\
			.normal_isa =		normal_isa,		\
			.probe =		probe,			\
			.ignore =		ignore,			\
			.forces =		forces,			\
		}

/* The following functions create an enum with the chip names as elements. 
   The first element of the enum is any_chip. These are the only macros
   a module will want to use. */

#define SENSORS_INSMOD_0 \
  enum chips { any_chip }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  static struct i2c_force_data forces[] = {{force,any_chip},{NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_1(chip1) \
  enum chips { any_chip, chip1 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  static struct i2c_force_data forces[] = {{force,any_chip},\
                                                 {force_ ## chip1,chip1}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_2(chip1,chip2) \
  enum chips { any_chip, chip1, chip2 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  SENSORS_MODULE_PARM_FORCE(chip2); \
  static struct i2c_force_data forces[] = {{force,any_chip}, \
                                                 {force_ ## chip1,chip1}, \
                                                 {force_ ## chip2,chip2}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_3(chip1,chip2,chip3) \
  enum chips { any_chip, chip1, chip2, chip3 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  SENSORS_MODULE_PARM_FORCE(chip2); \
  SENSORS_MODULE_PARM_FORCE(chip3); \
  static struct i2c_force_data forces[] = {{force,any_chip}, \
                                                 {force_ ## chip1,chip1}, \
                                                 {force_ ## chip2,chip2}, \
                                                 {force_ ## chip3,chip3}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_4(chip1,chip2,chip3,chip4) \
  enum chips { any_chip, chip1, chip2, chip3, chip4 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  SENSORS_MODULE_PARM_FORCE(chip2); \
  SENSORS_MODULE_PARM_FORCE(chip3); \
  SENSORS_MODULE_PARM_FORCE(chip4); \
  static struct i2c_force_data forces[] = {{force,any_chip}, \
                                                 {force_ ## chip1,chip1}, \
                                                 {force_ ## chip2,chip2}, \
                                                 {force_ ## chip3,chip3}, \
                                                 {force_ ## chip4,chip4}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_5(chip1,chip2,chip3,chip4,chip5) \
  enum chips { any_chip, chip1, chip2, chip3, chip4, chip5 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  SENSORS_MODULE_PARM_FORCE(chip2); \
  SENSORS_MODULE_PARM_FORCE(chip3); \
  SENSORS_MODULE_PARM_FORCE(chip4); \
  SENSORS_MODULE_PARM_FORCE(chip5); \
  static struct i2c_force_data forces[] = {{force,any_chip}, \
                                                 {force_ ## chip1,chip1}, \
                                                 {force_ ## chip2,chip2}, \
                                                 {force_ ## chip3,chip3}, \
                                                 {force_ ## chip4,chip4}, \
                                                 {force_ ## chip5,chip5}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_6(chip1,chip2,chip3,chip4,chip5,chip6) \
  enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  SENSORS_MODULE_PARM_FORCE(chip2); \
  SENSORS_MODULE_PARM_FORCE(chip3); \
  SENSORS_MODULE_PARM_FORCE(chip4); \
  SENSORS_MODULE_PARM_FORCE(chip5); \
  SENSORS_MODULE_PARM_FORCE(chip6); \
  static struct i2c_force_data forces[] = {{force,any_chip}, \
                                                 {force_ ## chip1,chip1}, \
                                                 {force_ ## chip2,chip2}, \
                                                 {force_ ## chip3,chip3}, \
                                                 {force_ ## chip4,chip4}, \
                                                 {force_ ## chip5,chip5}, \
                                                 {force_ ## chip6,chip6}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_7(chip1,chip2,chip3,chip4,chip5,chip6,chip7) \
  enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6, chip7 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  SENSORS_MODULE_PARM_FORCE(chip2); \
  SENSORS_MODULE_PARM_FORCE(chip3); \
  SENSORS_MODULE_PARM_FORCE(chip4); \
  SENSORS_MODULE_PARM_FORCE(chip5); \
  SENSORS_MODULE_PARM_FORCE(chip6); \
  SENSORS_MODULE_PARM_FORCE(chip7); \
  static struct i2c_force_data forces[] = {{force,any_chip}, \
                                                 {force_ ## chip1,chip1}, \
                                                 {force_ ## chip2,chip2}, \
                                                 {force_ ## chip3,chip3}, \
                                                 {force_ ## chip4,chip4}, \
                                                 {force_ ## chip5,chip5}, \
                                                 {force_ ## chip6,chip6}, \
                                                 {force_ ## chip7,chip7}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

#define SENSORS_INSMOD_8(chip1,chip2,chip3,chip4,chip5,chip6,chip7,chip8) \
  enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6, chip7, chip8 }; \
  I2C_CLIENT_MODULE_PARM(force, \
                      "List of adapter,address pairs to boldly assume " \
                      "to be present"); \
  SENSORS_MODULE_PARM_FORCE(chip1); \
  SENSORS_MODULE_PARM_FORCE(chip2); \
  SENSORS_MODULE_PARM_FORCE(chip3); \
  SENSORS_MODULE_PARM_FORCE(chip4); \
  SENSORS_MODULE_PARM_FORCE(chip5); \
  SENSORS_MODULE_PARM_FORCE(chip6); \
  SENSORS_MODULE_PARM_FORCE(chip7); \
  SENSORS_MODULE_PARM_FORCE(chip8); \
  static struct i2c_force_data forces[] = {{force,any_chip}, \
                                                 {force_ ## chip1,chip1}, \
                                                 {force_ ## chip2,chip2}, \
                                                 {force_ ## chip3,chip3}, \
                                                 {force_ ## chip4,chip4}, \
                                                 {force_ ## chip5,chip5}, \
                                                 {force_ ## chip6,chip6}, \
                                                 {force_ ## chip7,chip7}, \
                                                 {force_ ## chip8,chip8}, \
                                                 {NULL}}; \
  SENSORS_INSMOD

/* Detect function. It iterates over all possible addresses itself. For
   SMBus addresses, it will only call found_proc if some client is connected
   to the SMBus (unless a 'force' matched); for ISA detections, this is not
   done. */
extern int i2c_detect(struct i2c_adapter *adapter,
		      struct i2c_address_data *address_data,
		      int (*found_proc) (struct i2c_adapter *, int, int));


/* This macro is used to scale user-input to sensible values in almost all
   chip drivers. */
static inline int SENSORS_LIMIT(long value, long low, long high)
{
	if (value < low)
		return low;
	else if (value > high)
		return high;
	else
		return value;
}
#endif				/* def _LINUX_I2C_SENSOR_H */