mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-15 10:39:31 +00:00
Jean Delvare
239b3d0344
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2445 7894878c-1315-0410-8ee3-d5d059ff63e0
448 lines
17 KiB
C
448 lines
17 KiB
C
/*
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pcf8591.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 2001 Aurelien Jarno <aurelien@aurel32.net>
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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/slab.h>
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#include <linux/i2c.h>
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#include <linux/i2c-proc.h>
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#include <linux/init.h>
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#include "version.h"
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { SENSORS_I2C_END };
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static unsigned short normal_i2c_range[] = { 0x48, 0x4f, SENSORS_I2C_END };
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static unsigned int normal_isa[] = { SENSORS_ISA_END };
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static unsigned int normal_isa_range[] = { SENSORS_ISA_END };
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/* Insmod parameters */
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SENSORS_INSMOD_1(pcf8591);
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/* The PCF8591 control byte */
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/* 7 6 5 4 3 2 1 0 */
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/* | 0 |AOEF| AIP | 0 |AINC| AICH | */
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#define PCF8591_CONTROL_BYTE_AOEF 0x40 /* Analog Output Enable Flag */
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/* (analog output active if 1) */
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#define PCF8591_CONTROL_BYTE_AIP 0x30 /* Analog Input Programming */
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/* 0x00 = four single ended inputs */
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/* 0x10 = three differential inputs */
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/* 0x20 = single ended and differential mixed */
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/* 0x30 = two differential inputs */
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#define PCF8591_CONTROL_BYTE_AINC 0x04 /* Autoincrement Flag */
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/* (switch on if 1) */
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#define PCF8591_CONTROL_BYTE_AICH 0x03 /* Analog Output Enable Flag */
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/* 0x00 = channel 0 */
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/* 0x01 = channel 1 */
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/* 0x02 = channel 2 */
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/* 0x03 = channel 3 */
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/* Initial values */
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#define PCF8591_INIT_CONTROL_BYTE (PCF8591_CONTROL_BYTE_AOEF | PCF8591_CONTROL_BYTE_AINC)
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/* DAC out enabled, four single ended inputs, autoincrement */
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#define PCF8591_INIT_AOUT 0 /* DAC out = 0 */
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/* Conversions. */
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#define REG_TO_SIGNED(reg) (reg & 0x80)?(reg - 256):(reg)
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/* Convert signed 8 bit value to signed value */
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struct pcf8591_data {
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struct i2c_client client;
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int sysctl_id;
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struct semaphore update_lock;
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char valid; /* !=0 if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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u8 control_byte;
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u8 ch[4];
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u8 aout;
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};
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static int pcf8591_attach_adapter(struct i2c_adapter *adapter);
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static int pcf8591_detect(struct i2c_adapter *adapter, int address,
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unsigned short flags, int kind);
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static int pcf8591_detach_client(struct i2c_client *client);
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static void pcf8591_update_client(struct i2c_client *client);
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static void pcf8591_init_client(struct i2c_client *client);
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static void pcf8591_ain_conf(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void pcf8591_ain(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void pcf8591_aout_enable(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void pcf8591_aout(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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/* This is the driver that will be inserted */
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static struct i2c_driver pcf8591_driver = {
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.owner = THIS_MODULE,
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.name = "PCF8591 sensor chip driver",
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.id = I2C_DRIVERID_PCF8591,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = pcf8591_attach_adapter,
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.detach_client = pcf8591_detach_client,
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};
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static int pcf8591_id = 0;
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/* The /proc/sys entries */
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/* -- SENSORS SYSCTL START -- */
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#define PCF8591_SYSCTL_AIN_CONF 1000 /* Analog input configuration */
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#define PCF8591_SYSCTL_CH0 1001 /* Input channel 1 */
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#define PCF8591_SYSCTL_CH1 1002 /* Input channel 2 */
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#define PCF8591_SYSCTL_CH2 1003 /* Input channel 3 */
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#define PCF8591_SYSCTL_CH3 1004 /* Input channel 4 */
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#define PCF8591_SYSCTL_AOUT_ENABLE 1005 /* Analog output enable flag */
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#define PCF8591_SYSCTL_AOUT 1006 /* Analog output */
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/* -- SENSORS SYSCTL END -- */
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/* These files are created for each detected PCF8591. This is just a template;
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though at first sight, you might think we could use a statically
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allocated list, we need some way to get back to the parent - which
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is done through one of the 'extra' fields which are initialized
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when a new copy is allocated. */
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static ctl_table pcf8591_dir_table_template[] = {
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{PCF8591_SYSCTL_AIN_CONF, "ain_conf", NULL, 0, 0644, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, &pcf8591_ain_conf},
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{PCF8591_SYSCTL_CH0, "ch0", NULL, 0, 0444, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, &pcf8591_ain},
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{PCF8591_SYSCTL_CH1, "ch1", NULL, 0, 0444, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, &pcf8591_ain},
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{PCF8591_SYSCTL_CH2, "ch2", NULL, 0, 0444, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, &pcf8591_ain},
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{PCF8591_SYSCTL_CH3, "ch3", NULL, 0, 0444, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, &pcf8591_ain},
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{PCF8591_SYSCTL_AOUT_ENABLE, "aout_enable", NULL, 0, 0644, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, &pcf8591_aout_enable},
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{PCF8591_SYSCTL_AOUT, "aout", NULL, 0, 0644, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, &pcf8591_aout},
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{0}
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};
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/* This function is called when:
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* pcf8591_driver is inserted (when this module is loaded), for each
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available adapter
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* when a new adapter is inserted (and pcf8591_driver is still present) */
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static int pcf8591_attach_adapter(struct i2c_adapter *adapter)
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{
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return i2c_detect(adapter, &addr_data, pcf8591_detect);
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}
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/* This function is called by i2c_detect */
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int pcf8591_detect(struct i2c_adapter *adapter, int address,
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unsigned short flags, int kind)
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{
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int i;
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struct i2c_client *new_client;
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struct pcf8591_data *data;
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int err = 0;
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const char *type_name = "";
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const char *client_name = "";
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/* Make sure we aren't probing the ISA bus!! This is just a safety check at this moment; i2c_detect really won't call us. */
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#ifdef DEBUG
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if (i2c_is_isa_adapter(adapter)) {
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printk
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(KERN_ERR "pcf8591.o: pcf8591_detect called for an ISA bus adapter?!?\n");
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return 0;
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}
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#endif
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE
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| I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
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goto ERROR0;
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/* OK. For now, we presume we have a valid client. We now create the
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client structure, even though we cannot fill it completely yet. */
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if (!(data = kmalloc(sizeof(struct pcf8591_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto ERROR0;
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}
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new_client = &data->client;
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new_client->addr = address;
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new_client->data = data;
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new_client->adapter = adapter;
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new_client->driver = &pcf8591_driver;
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new_client->flags = 0;
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/* Now, we would do the remaining detection. But the PCF8591 is plainly
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impossible to detect! Stupid chip. */
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/* Determine the chip type - only one kind supported! */
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if (kind <= 0)
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kind = pcf8591;
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type_name = "pcf8591";
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client_name = "PCF8591 chip";
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/* Fill in the remaining client fields and put it into the global list */
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strcpy(new_client->name, client_name);
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new_client->id = pcf8591_id++;
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data->valid = 0;
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init_MUTEX(&data->update_lock);
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/* Tell the I2C layer a new client has arrived */
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if ((err = i2c_attach_client(new_client)))
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goto ERROR3;
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/* Register a new directory entry with module sensors */
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if ((i = i2c_register_entry(new_client,
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type_name,
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pcf8591_dir_table_template)) < 0) {
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err = i;
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goto ERROR4;
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}
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data->sysctl_id = i;
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/* Initialize the PCF8591 chip */
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pcf8591_init_client(new_client);
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return 0;
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/* OK, this is not exactly good programming practice, usually. But it is
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very code-efficient in this case. */
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ERROR4:
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i2c_detach_client(new_client);
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ERROR3:
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kfree(data);
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ERROR0:
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return err;
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}
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static int pcf8591_detach_client(struct i2c_client *client)
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{
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int err;
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i2c_deregister_entry(((struct pcf8591_data *) (client->data))->
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sysctl_id);
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if ((err = i2c_detach_client(client))) {
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printk
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(KERN_ERR "pcf8591.o: Client deregistration failed, client not detached.\n");
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return err;
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}
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kfree(client->data);
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return 0;
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}
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/* Called when we have found a new PCF8591. */
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static void pcf8591_init_client(struct i2c_client *client)
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{
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struct pcf8591_data *data = client->data;
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data->control_byte = PCF8591_INIT_CONTROL_BYTE;
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data->aout = PCF8591_INIT_AOUT;
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i2c_smbus_write_byte_data(client, data->control_byte, data->aout);
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}
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static void pcf8591_update_client(struct i2c_client *client)
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{
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struct pcf8591_data *data = client->data;
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down(&data->update_lock);
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if ((jiffies - data->last_updated > HZ + HZ / 2) ||
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(jiffies < data->last_updated) || !data->valid) {
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#ifdef DEBUG
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printk(KERN_DEBUG "Starting pcf8591 update\n");
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#endif
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i2c_smbus_write_byte(client, data->control_byte);
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i2c_smbus_read_byte(client); /* The first byte transmitted contains the */
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/* conversion code of the previous read cycled */
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/* FLUSH IT ! */
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/* Number of byte to read to signed depend on the analog input mode */
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data->ch[0] = i2c_smbus_read_byte(client);
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data->ch[1] = i2c_smbus_read_byte(client);
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/* In all case, read at least two values */
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if ((data->control_byte & PCF8591_CONTROL_BYTE_AIP) != 0x30)
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data->ch[2] = i2c_smbus_read_byte(client);
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/* Read the third value if not in "two differential inputs" mode */
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if ((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 0x00)
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data->ch[3] = i2c_smbus_read_byte(client);
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/* Read the fourth value only in "four single ended inputs" mode */
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data->last_updated = jiffies;
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data->valid = 1;
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}
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up(&data->update_lock);
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}
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/* The next few functions are the call-back functions of the /proc/sys and
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sysctl files. Which function is used is defined in the ctl_table in
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the extra1 field. */
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void pcf8591_ain_conf(struct i2c_client *client, int operation, int ctl_name,
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int *nrels_mag, long *results)
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{
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struct pcf8591_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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results[0] = (data->control_byte & PCF8591_CONTROL_BYTE_AIP) >> 4;
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*nrels_mag = 1;
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} else if (operation == SENSORS_PROC_REAL_WRITE) {
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if (*nrels_mag >= 1) {
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if (results[0] >= 0 && results[0] <= 3)
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{
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data->control_byte &= ~PCF8591_CONTROL_BYTE_AIP;
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data->control_byte |= (results[0] << 4);
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i2c_smbus_write_byte(client, data->control_byte);
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data->valid = 0;
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}
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}
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}
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}
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void pcf8591_ain(struct i2c_client *client, int operation, int ctl_name,
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int *nrels_mag, long *results)
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{
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struct pcf8591_data *data = client->data;
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int nr = ctl_name - PCF8591_SYSCTL_CH0;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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pcf8591_update_client(client);
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/* Number of data to show and conversion to signed depend on */
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/* the analog input mode */
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switch(nr) {
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case 0:
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if (((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 0)
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| ((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 2))
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results[0] = data->ch[0]; /* single ended */
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else
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results[0] = REG_TO_SIGNED(data->ch[0]);/* differential */
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break;
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case 1:
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if (((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 0)
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| ((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 2))
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results[0] = data->ch[1]; /* single ended */
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else
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results[0] = REG_TO_SIGNED(data->ch[1]);/* differential */
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break;
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case 2:
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if ((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 3)
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results[0] = 0; /* channel not used */
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else if ((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 0)
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results[0] = data->ch[2]; /* single ended */
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else
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results[0] = REG_TO_SIGNED(data->ch[2]);/* differential */
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break;
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case 3:
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if (((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 0)
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| ((data->control_byte & PCF8591_CONTROL_BYTE_AIP) == 2))
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results[0] = data->ch[3]; /* single ended */
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else
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results[0] = 0; /* channel not used */
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break;
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}
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*nrels_mag = 1;
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}
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}
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void pcf8591_aout_enable(struct i2c_client *client, int operation, int ctl_name,
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int *nrels_mag, long *results)
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{
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struct pcf8591_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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results[0] = !(!(data->control_byte & PCF8591_CONTROL_BYTE_AOEF));
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*nrels_mag = 1;
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} else if (operation == SENSORS_PROC_REAL_WRITE) {
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if (*nrels_mag >= 1) {
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if (results[0])
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data->control_byte |= PCF8591_CONTROL_BYTE_AOEF;
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else
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data->control_byte &= ~PCF8591_CONTROL_BYTE_AOEF;
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i2c_smbus_write_byte(client, data->control_byte);
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}
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}
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}
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void pcf8591_aout(struct i2c_client *client, int operation, int ctl_name,
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int *nrels_mag, long *results)
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{
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struct pcf8591_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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results[0] = data->aout;
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*nrels_mag = 1;
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} else if (operation == SENSORS_PROC_REAL_WRITE) {
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if (*nrels_mag >= 1) {
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if (results[0] >= 0 && results[0] <= 255) /* ignore values outside DAC range */
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{
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data->aout = results[0];
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i2c_smbus_write_byte_data(client, data->control_byte, data->aout);
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}
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}
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}
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}
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static int __init sm_pcf8591_init(void)
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{
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printk(KERN_INFO "pcf8591.o version %s (%s)\n", LM_VERSION, LM_DATE);
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return i2c_add_driver(&pcf8591_driver);
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}
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static void __exit sm_pcf8591_exit(void)
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{
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i2c_del_driver(&pcf8591_driver);
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}
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MODULE_AUTHOR("Aurelien Jarno <aurelien@aurel32.net>");
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MODULE_DESCRIPTION("PCF8591 driver");
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MODULE_LICENSE("GPL");
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module_init(sm_pcf8591_init);
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module_exit(sm_pcf8591_exit);
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