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linux-sg2042/drivers/hwmon/adm1021.c

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/*
adm1021.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
Philip Edelbrock <phil@netroedge.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/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
0x29, 0x2a, 0x2b,
0x4c, 0x4d, 0x4e,
I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066);
/* adm1021 constants specified below */
/* The adm1021 registers */
/* Read-only */
#define ADM1021_REG_TEMP 0x00
#define ADM1021_REG_REMOTE_TEMP 0x01
#define ADM1021_REG_STATUS 0x02
#define ADM1021_REG_MAN_ID 0x0FE /* 0x41 = AMD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/
#define ADM1021_REG_DEV_ID 0x0FF /* ADM1021 = 0x0X, ADM1023 = 0x3X */
#define ADM1021_REG_DIE_CODE 0x0FF /* MAX1617A */
/* These use different addresses for reading/writing */
#define ADM1021_REG_CONFIG_R 0x03
#define ADM1021_REG_CONFIG_W 0x09
#define ADM1021_REG_CONV_RATE_R 0x04
#define ADM1021_REG_CONV_RATE_W 0x0A
/* These are for the ADM1023's additional precision on the remote temp sensor */
#define ADM1021_REG_REM_TEMP_PREC 0x010
#define ADM1021_REG_REM_OFFSET 0x011
#define ADM1021_REG_REM_OFFSET_PREC 0x012
#define ADM1021_REG_REM_TOS_PREC 0x013
#define ADM1021_REG_REM_THYST_PREC 0x014
/* limits */
#define ADM1021_REG_TOS_R 0x05
#define ADM1021_REG_TOS_W 0x0B
#define ADM1021_REG_REMOTE_TOS_R 0x07
#define ADM1021_REG_REMOTE_TOS_W 0x0D
#define ADM1021_REG_THYST_R 0x06
#define ADM1021_REG_THYST_W 0x0C
#define ADM1021_REG_REMOTE_THYST_R 0x08
#define ADM1021_REG_REMOTE_THYST_W 0x0E
/* write-only */
#define ADM1021_REG_ONESHOT 0x0F
/* Conversions. Rounding and limit checking is only done on the TO_REG
variants. Note that you should be a bit careful with which arguments
these macros are called: arguments may be evaluated more than once.
Fixing this is just not worth it. */
/* Conversions note: 1021 uses normal integer signed-byte format*/
#define TEMP_FROM_REG(val) (val > 127 ? (val-256)*1000 : val*1000)
#define TEMP_TO_REG(val) (SENSORS_LIMIT((val < 0 ? (val/1000)+256 : val/1000),0,255))
/* Initial values */
/* Note: Even though I left the low and high limits named os and hyst,
they don't quite work like a thermostat the way the LM75 does. I.e.,
a lower temp than THYST actually triggers an alarm instead of
clearing it. Weird, ey? --Phil */
/* Each client has this additional data */
struct adm1021_data {
struct i2c_client client;
struct class_device *class_dev;
enum chips type;
struct mutex update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
u8 temp_max; /* Register values */
u8 temp_hyst;
u8 temp_input;
u8 remote_temp_max;
u8 remote_temp_hyst;
u8 remote_temp_input;
u8 alarms;
/* Special values for ADM1023 only */
u8 remote_temp_prec;
u8 remote_temp_os_prec;
u8 remote_temp_hyst_prec;
u8 remote_temp_offset;
u8 remote_temp_offset_prec;
};
static int adm1021_attach_adapter(struct i2c_adapter *adapter);
static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind);
static void adm1021_init_client(struct i2c_client *client);
static int adm1021_detach_client(struct i2c_client *client);
static int adm1021_read_value(struct i2c_client *client, u8 reg);
static int adm1021_write_value(struct i2c_client *client, u8 reg,
u16 value);
static struct adm1021_data *adm1021_update_device(struct device *dev);
/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */
static int read_only;
/* This is the driver that will be inserted */
static struct i2c_driver adm1021_driver = {
.driver = {
.name = "adm1021",
},
.id = I2C_DRIVERID_ADM1021,
.attach_adapter = adm1021_attach_adapter,
.detach_client = adm1021_detach_client,
};
#define show(value) \
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct adm1021_data *data = adm1021_update_device(dev); \
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
}
show(temp_max);
show(temp_hyst);
show(temp_input);
show(remote_temp_max);
show(remote_temp_hyst);
show(remote_temp_input);
#define show2(value) \
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct adm1021_data *data = adm1021_update_device(dev); \
return sprintf(buf, "%d\n", data->value); \
}
show2(alarms);
#define set(value, reg) \
static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) \
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct adm1021_data *data = i2c_get_clientdata(client); \
int temp = simple_strtoul(buf, NULL, 10); \
\
mutex_lock(&data->update_lock); \
data->value = TEMP_TO_REG(temp); \
adm1021_write_value(client, reg, data->value); \
mutex_unlock(&data->update_lock); \
return count; \
}
set(temp_max, ADM1021_REG_TOS_W);
set(temp_hyst, ADM1021_REG_THYST_W);
set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W);
set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W);
static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst);
static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max);
static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst);
static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static int adm1021_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, adm1021_detect);
}
static struct attribute *adm1021_attributes[] = {
&dev_attr_temp1_max.attr,
&dev_attr_temp1_min.attr,
&dev_attr_temp1_input.attr,
&dev_attr_temp2_max.attr,
&dev_attr_temp2_min.attr,
&dev_attr_temp2_input.attr,
&dev_attr_alarms.attr,
NULL
};
static const struct attribute_group adm1021_group = {
.attrs = adm1021_attributes,
};
static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind)
{
int i;
struct i2c_client *new_client;
struct adm1021_data *data;
int err = 0;
const char *type_name = "";
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto error0;
/* OK. For now, we presume we have a valid client. We now create the
client structure, even though we cannot fill it completely yet.
But it allows us to access adm1021_{read,write}_value. */
if (!(data = kzalloc(sizeof(struct adm1021_data), GFP_KERNEL))) {
err = -ENOMEM;
goto error0;
}
new_client = &data->client;
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &adm1021_driver;
new_client->flags = 0;
/* Now, we do the remaining detection. */
if (kind < 0) {
if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00
|| (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00
|| (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) {
err = -ENODEV;
goto error1;
}
}
/* Determine the chip type. */
if (kind <= 0) {
i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID);
if (i == 0x41)
if ((adm1021_read_value(new_client, ADM1021_REG_DEV_ID) & 0x0F0) == 0x030)
kind = adm1023;
else
kind = adm1021;
else if (i == 0x49)
kind = thmc10;
else if (i == 0x23)
kind = gl523sm;
else if ((i == 0x4d) &&
(adm1021_read_value(new_client, ADM1021_REG_DEV_ID) == 0x01))
kind = max1617a;
else if (i == 0x54)
kind = mc1066;
/* LM84 Mfr ID in a different place, and it has more unused bits */
else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) == 0x00
&& (kind == 0 /* skip extra detection */
|| ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) == 0x00
&& (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) == 0x00)))
kind = lm84;
else
kind = max1617;
}
if (kind == max1617) {
type_name = "max1617";
} else if (kind == max1617a) {
type_name = "max1617a";
} else if (kind == adm1021) {
type_name = "adm1021";
} else if (kind == adm1023) {
type_name = "adm1023";
} else if (kind == thmc10) {
type_name = "thmc10";
} else if (kind == lm84) {
type_name = "lm84";
} else if (kind == gl523sm) {
type_name = "gl523sm";
} else if (kind == mc1066) {
type_name = "mc1066";
}
/* Fill in the remaining client fields and put it into the global list */
strlcpy(new_client->name, type_name, I2C_NAME_SIZE);
data->type = kind;
data->valid = 0;
mutex_init(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto error1;
/* Initialize the ADM1021 chip */
if (kind != lm84)
adm1021_init_client(new_client);
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj, &adm1021_group)))
goto error2;
data->class_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->class_dev)) {
err = PTR_ERR(data->class_dev);
goto error3;
}
return 0;
error3:
sysfs_remove_group(&new_client->dev.kobj, &adm1021_group);
error2:
i2c_detach_client(new_client);
error1:
kfree(data);
error0:
return err;
}
static void adm1021_init_client(struct i2c_client *client)
{
/* Enable ADC and disable suspend mode */
adm1021_write_value(client, ADM1021_REG_CONFIG_W,
adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF);
/* Set Conversion rate to 1/sec (this can be tinkered with) */
adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04);
}
static int adm1021_detach_client(struct i2c_client *client)
{
struct adm1021_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->class_dev);
sysfs_remove_group(&client->dev.kobj, &adm1021_group);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;
}
/* All registers are byte-sized */
static int adm1021_read_value(struct i2c_client *client, u8 reg)
{
return i2c_smbus_read_byte_data(client, reg);
}
static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value)
{
if (!read_only)
return i2c_smbus_write_byte_data(client, reg, value);
return 0;
}
static struct adm1021_data *adm1021_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct adm1021_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
dev_dbg(&client->dev, "Starting adm1021 update\n");
data->temp_input = adm1021_read_value(client, ADM1021_REG_TEMP);
data->temp_max = adm1021_read_value(client, ADM1021_REG_TOS_R);
data->temp_hyst = adm1021_read_value(client, ADM1021_REG_THYST_R);
data->remote_temp_input = adm1021_read_value(client, ADM1021_REG_REMOTE_TEMP);
data->remote_temp_max = adm1021_read_value(client, ADM1021_REG_REMOTE_TOS_R);
data->remote_temp_hyst = adm1021_read_value(client, ADM1021_REG_REMOTE_THYST_R);
data->alarms = adm1021_read_value(client, ADM1021_REG_STATUS) & 0x7c;
if (data->type == adm1023) {
data->remote_temp_prec = adm1021_read_value(client, ADM1021_REG_REM_TEMP_PREC);
data->remote_temp_os_prec = adm1021_read_value(client, ADM1021_REG_REM_TOS_PREC);
data->remote_temp_hyst_prec = adm1021_read_value(client, ADM1021_REG_REM_THYST_PREC);
data->remote_temp_offset = adm1021_read_value(client, ADM1021_REG_REM_OFFSET);
data->remote_temp_offset_prec = adm1021_read_value(client, ADM1021_REG_REM_OFFSET_PREC);
}
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static int __init sensors_adm1021_init(void)
{
return i2c_add_driver(&adm1021_driver);
}
static void __exit sensors_adm1021_exit(void)
{
i2c_del_driver(&adm1021_driver);
}
MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and "
"Philip Edelbrock <phil@netroedge.com>");
MODULE_DESCRIPTION("adm1021 driver");
MODULE_LICENSE("GPL");
module_param(read_only, bool, 0);
MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
module_init(sensors_adm1021_init)
module_exit(sensors_adm1021_exit)
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