mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-18 11:09:32 +00:00
Mark D. Studebaker
7bd97f4667
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1201 7894878c-1315-0410-8ee3-d5d059ff63e0
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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i2c-isa.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 1998, 1999 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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/* This implements an i2c algorithm/adapter for ISA bus. Not that this is
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on first sight very useful; almost no functionality is preserved.
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Except that it makes writing drivers for chips which can be on both
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the SMBus and the ISA bus very much easier. See lm78.c for an example
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of this. */
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#include <linux/version.h>
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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/init.h>
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#include "version.h"
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#ifdef MODULE_LICENSE
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MODULE_LICENSE("GPL");
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#endif
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static void isa_inc_use(struct i2c_adapter *adapter);
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static void isa_dec_use(struct i2c_adapter *adapter);
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static u32 isa_func(struct i2c_adapter *adapter);
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#ifdef MODULE
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static
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#else
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extern
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#endif
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int __init i2c_isa_init(void);
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static int __init isa_cleanup(void);
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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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/* This is the actual algorithm we define */
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static struct i2c_algorithm isa_algorithm = {
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/* name */ "ISA bus algorithm",
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/* id */ I2C_ALGO_ISA,
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/* master_xfer */ NULL,
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/* smbus_access */ NULL,
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/* slave_send */ NULL,
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/* slave_rcv */ NULL,
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/* algo_control */ NULL,
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/* functionality */ &isa_func,
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};
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/* There can only be one... */
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static struct i2c_adapter isa_adapter = {
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/* name */ "ISA main adapter",
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/* id */ I2C_ALGO_ISA | I2C_HW_ISA,
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/* algorithm */ &isa_algorithm,
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/* algo_data */ NULL,
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/* inc_use */ &isa_inc_use,
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/* dec_use */ &isa_dec_use,
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/* data */ NULL,
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/* Other fields not initialized */
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};
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/* Used in isa_init/cleanup */
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static int __initdata isa_initialized;
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void isa_inc_use(struct i2c_adapter *adapter)
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{
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#ifdef MODULE
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MOD_INC_USE_COUNT;
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#endif
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}
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void isa_dec_use(struct i2c_adapter *adapter)
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{
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#ifdef MODULE
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MOD_DEC_USE_COUNT;
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#endif
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}
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/* We can't do a thing... */
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static u32 isa_func(struct i2c_adapter *adapter)
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{
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return 0;
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}
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int __init i2c_isa_init(void)
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{
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int res;
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printk("i2c-isa.o version %s (%s)\n", LM_VERSION, LM_DATE);
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#ifdef DEBUG
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if (isa_initialized) {
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printk
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("i2c-isa.o: Oops, isa_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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isa_initialized = 0;
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if ((res = i2c_add_adapter(&isa_adapter))) {
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printk("i2c-isa.o: Adapter registration failed, "
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"module i2c-isa.o is not inserted\n.");
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isa_cleanup();
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return res;
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}
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isa_initialized++;
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printk("i2c-isa.o: ISA bus access for i2c modules initialized.\n");
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return 0;
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}
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int __init isa_cleanup(void)
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{
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int res;
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if (isa_initialized >= 1) {
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if ((res = i2c_del_adapter(&isa_adapter))) {
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printk
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("i2c-isa.o: Adapter deregistration failed, module not removed.\n");
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return res;
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} else
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isa_initialized--;
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}
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return 0;
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}
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EXPORT_NO_SYMBOLS;
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#ifdef MODULE
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MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
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MODULE_DESCRIPTION("ISA bus access through i2c");
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int init_module(void)
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{
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return i2c_isa_init();
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}
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int cleanup_module(void)
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{
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return isa_cleanup();
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}
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#endif /* MODULE */
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