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https://github.com/lm-sensors/lm-sensors.git
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Frodo Looijaard
45d6e40e75
Though it is called the LM78 driver, there is not too much LM78 specific code in it; it can better be seen as an example code skeleton for other drivers. Right now, it creats a file /proc/sensors-test, which contains a list of busses it registered itself on. Stupid, but very useful for testing purposes! You need a 2.0 kernel for lm78.o to insert (or hack the /proc system specific parts; see lm78.c of lm_sensors version 1 how to do this). Other parts of lm_sensors-2 are not tested for 2.1 kernels either, but I am certain it won't work in this case :-). See the TODO list to get some idea what is left to do, choose something and implement it. Or not :-). But please, send a note to the mailing list when you start on something, to avoid duplicate work... Other notable changes: the smbus_access routines now use (the more logical) i2c_adapter structure, instead of smbus_adapter. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@13 7894878c-1315-0410-8ee3-d5d059ff63e0
122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
/*
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smbus.c - A Linux module for reading sensor data.
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Copyright (c) 1998 Frodo Looijaard <frodol@dds.nl>
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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 "smbus.h"
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#include "version.h"
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static int piix4_init(void);
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static int piix4_cleanup(void);
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static int piix4_setup(void);
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static s32 piix4_access(u8 addr, char read_write,
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u8 command, int size, union smbus_data * data);
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#ifdef MODULE
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extern int init_module(void);
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extern int cleanup_module(void);
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#endif /* MODULE */
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static struct smbus_adapter piix4_adapter;
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static int piix4_initialized;
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/* Detect whether a PIIX4 can be found, and initialize it, where necessary.
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Return -ENODEV if not found. */
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int piix4_setup(void)
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{
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return -ENODEV;
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/* TO BE WRITTEN! */
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}
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/* Return -1 on error. See smbus.h for more information */
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s32 piix4_access(u8 addr, char read_write,
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u8 command, int size, union smbus_data * data)
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{
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/* TO BE WRITTEN! */
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return -1;
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}
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int piix4_init(void)
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{
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int res;
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printk("piix4.o version %s (%s)\n",LM_VERSION,LM_DATE);
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#ifdef DEBUG
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if (piix4_initialized) {
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printk("piix4.o: Oops, piix4_init called a second time!\n");
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return -EBUSY;
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}
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#endif
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piix4_initialized = 0;
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if ((res = piix4_setup())) {
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printk("piix4.o: PIIX4 not detected, module not inserted\n");
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piix4_cleanup();
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return res;
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}
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piix4_initialized ++;
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strcpy(piix4_adapter.name,"SMBus PIIX4 adapter");
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piix4_adapter.id = ALGO_SMBUS | SMBUS_PIIX4;
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piix4_adapter.algo = &smbus_algorithm;
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piix4_adapter.smbus_access = &piix4_access;
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if ((res = smbus_add_adapter(&piix4_adapter))) {
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printk("piix4.o: smbus_add_adapter failed, module not inserted\n");
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piix4_cleanup();
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return res;
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}
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piix4_initialized++;
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printk("piix4.o: PIIX4 bus detected and initialized\n");
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return 0;
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}
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int piix4_cleanup(void)
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{
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int res;
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if (piix4_initialized >= 2)
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{
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if ((res = smbus_del_adapter(&piix4_adapter))) {
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printk("piix4.o: smbus_del_adapter failed, module not removed\n");
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return res;
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} else
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piix4_initialized--;
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}
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if (piix4_initialized >= 1) {
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/* Undo anything piix4_setup did */
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piix4_initialized--;
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}
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return 0;
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}
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#ifdef MODULE
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MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
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MODULE_DESCRIPTION("PIIX4 SMBus driver");
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int init_module(void)
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{
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return piix4_init();
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}
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int cleanup_module(void)
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{
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return piix4_cleanup();
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}
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#endif /* MODULE */
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