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linux/drivers/hwmon/lm92.c

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/*
* lm92 - Hardware monitoring driver
* Copyright (C) 2005 Jean Delvare <khali@linux-fr.org>
*
* Based on the lm90 driver, with some ideas taken from the lm_sensors
* lm92 driver as well.
*
* The LM92 is a sensor chip made by National Semiconductor. It reports
* its own temperature with a 0.0625 deg resolution and a 0.33 deg
* accuracy. Complete datasheet can be obtained from National's website
* at:
* http://www.national.com/pf/LM/LM92.html
*
* This driver also supports the MAX6635 sensor chip made by Maxim.
* This chip is compatible with the LM92, but has a lesser accuracy
* (1.0 deg). Complete datasheet can be obtained from Maxim's website
* at:
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
*
* Since the LM92 was the first chipset supported by this driver, most
* comments will refer to this chipset, but are actually general and
* concern all supported chipsets, unless mentioned otherwise.
*
* Support could easily be added for the National Semiconductor LM76
* and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
* with the LM92.
*
* 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/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
/* The LM92 and MAX6635 have 2 two-state pins for address selection,
resulting in 4 possible addresses. */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD_1(lm92);
/* The LM92 registers */
#define LM92_REG_CONFIG 0x01 /* 8-bit, RW */
#define LM92_REG_TEMP 0x00 /* 16-bit, RO */
#define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */
#define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */
#define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */
#define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */
#define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */
/* The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
left-justified in 16-bit registers. No rounding is done, with such
a resolution it's just not worth it. Note that the MAX6635 doesn't
make use of the 4 lower bits for limits (i.e. effective resolution
for limits is 1 degree Celsius). */
static inline int TEMP_FROM_REG(s16 reg)
{
return reg / 8 * 625 / 10;
}
static inline s16 TEMP_TO_REG(int val)
{
if (val <= -60000)
return -60000 * 10 / 625 * 8;
if (val >= 160000)
return 160000 * 10 / 625 * 8;
return val * 10 / 625 * 8;
}
/* Alarm flags are stored in the 3 LSB of the temperature register */
static inline u8 ALARMS_FROM_REG(s16 reg)
{
return reg & 0x0007;
}
/* Driver data (common to all clients) */
static struct i2c_driver lm92_driver;
/* Client data (each client gets its own) */
struct lm92_data {
struct i2c_client client;
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* registers values */
s16 temp1_input, temp1_crit, temp1_min, temp1_max, temp1_hyst;
};
/*
* Sysfs attributes and callback functions
*/
static struct lm92_data *lm92_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm92_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ)
|| !data->valid) {
dev_dbg(&client->dev, "Updating lm92 data\n");
data->temp1_input = swab16(i2c_smbus_read_word_data(client,
LM92_REG_TEMP));
data->temp1_hyst = swab16(i2c_smbus_read_word_data(client,
LM92_REG_TEMP_HYST));
data->temp1_crit = swab16(i2c_smbus_read_word_data(client,
LM92_REG_TEMP_CRIT));
data->temp1_min = swab16(i2c_smbus_read_word_data(client,
LM92_REG_TEMP_LOW));
data->temp1_max = swab16(i2c_smbus_read_word_data(client,
LM92_REG_TEMP_HIGH));
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
#define show_temp(value) \
static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct lm92_data *data = lm92_update_device(dev); \
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \
}
show_temp(temp1_input);
show_temp(temp1_crit);
show_temp(temp1_min);
show_temp(temp1_max);
#define set_temp(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 lm92_data *data = i2c_get_clientdata(client); \
long val = simple_strtol(buf, NULL, 10); \
\
mutex_lock(&data->update_lock); \
data->value = TEMP_TO_REG(val); \
i2c_smbus_write_word_data(client, reg, swab16(data->value)); \
mutex_unlock(&data->update_lock); \
return count; \
}
set_temp(temp1_crit, LM92_REG_TEMP_CRIT);
set_temp(temp1_min, LM92_REG_TEMP_LOW);
set_temp(temp1_max, LM92_REG_TEMP_HIGH);
static ssize_t show_temp1_crit_hyst(struct device *dev, struct device_attribute *attr, char *buf)
{
struct lm92_data *data = lm92_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_crit)
- TEMP_FROM_REG(data->temp1_hyst));
}
static ssize_t show_temp1_max_hyst(struct device *dev, struct device_attribute *attr, char *buf)
{
struct lm92_data *data = lm92_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_max)
- TEMP_FROM_REG(data->temp1_hyst));
}
static ssize_t show_temp1_min_hyst(struct device *dev, struct device_attribute *attr, char *buf)
{
struct lm92_data *data = lm92_update_device(dev);
return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_min)
+ TEMP_FROM_REG(data->temp1_hyst));
}
static ssize_t set_temp1_crit_hyst(struct device *dev, struct device_attribute *attr, const char *buf,
size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm92_data *data = i2c_get_clientdata(client);
long val = simple_strtol(buf, NULL, 10);
mutex_lock(&data->update_lock);
data->temp1_hyst = TEMP_FROM_REG(data->temp1_crit) - val;
i2c_smbus_write_word_data(client, LM92_REG_TEMP_HYST,
swab16(TEMP_TO_REG(data->temp1_hyst)));
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
{
struct lm92_data *data = lm92_update_device(dev);
return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp1_input));
}
static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
char *buf)
{
int bitnr = to_sensor_dev_attr(attr)->index;
struct lm92_data *data = lm92_update_device(dev);
return sprintf(buf, "%d\n", (data->temp1_input >> bitnr) & 1);
}
static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp1_input, NULL);
static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp1_crit,
set_temp1_crit);
static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp1_crit_hyst,
set_temp1_crit_hyst);
static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp1_min,
set_temp1_min);
static DEVICE_ATTR(temp1_min_hyst, S_IRUGO, show_temp1_min_hyst, NULL);
static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp1_max,
set_temp1_max);
static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_temp1_max_hyst, NULL);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
/*
* Detection and registration
*/
static void lm92_init_client(struct i2c_client *client)
{
u8 config;
/* Start the conversions if needed */
config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
if (config & 0x01)
i2c_smbus_write_byte_data(client, LM92_REG_CONFIG,
config & 0xFE);
}
/* The MAX6635 has no identification register, so we have to use tricks
to identify it reliably. This is somewhat slow.
Note that we do NOT rely on the 2 MSB of the configuration register
always reading 0, as suggested by the datasheet, because it was once
reported not to be true. */
static int max6635_check(struct i2c_client *client)
{
u16 temp_low, temp_high, temp_hyst, temp_crit;
u8 conf;
int i;
/* No manufacturer ID register, so a read from this address will
always return the last read value. */
temp_low = i2c_smbus_read_word_data(client, LM92_REG_TEMP_LOW);
if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_low)
return 0;
temp_high = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HIGH);
if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_high)
return 0;
/* Limits are stored as integer values (signed, 9-bit). */
if ((temp_low & 0x7f00) || (temp_high & 0x7f00))
return 0;
temp_hyst = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HYST);
temp_crit = i2c_smbus_read_word_data(client, LM92_REG_TEMP_CRIT);
if ((temp_hyst & 0x7f00) || (temp_crit & 0x7f00))
return 0;
/* Registers addresses were found to cycle over 16-byte boundaries.
We don't test all registers with all offsets so as to save some
reads and time, but this should still be sufficient to dismiss
non-MAX6635 chips. */
conf = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG);
for (i=16; i<96; i*=2) {
if (temp_hyst != i2c_smbus_read_word_data(client,
LM92_REG_TEMP_HYST + i - 16)
|| temp_crit != i2c_smbus_read_word_data(client,
LM92_REG_TEMP_CRIT + i)
|| temp_low != i2c_smbus_read_word_data(client,
LM92_REG_TEMP_LOW + i + 16)
|| temp_high != i2c_smbus_read_word_data(client,
LM92_REG_TEMP_HIGH + i + 32)
|| conf != i2c_smbus_read_byte_data(client,
LM92_REG_CONFIG + i))
return 0;
}
return 1;
}
static struct attribute *lm92_attributes[] = {
&dev_attr_temp1_input.attr,
&dev_attr_temp1_crit.attr,
&dev_attr_temp1_crit_hyst.attr,
&dev_attr_temp1_min.attr,
&dev_attr_temp1_min_hyst.attr,
&dev_attr_temp1_max.attr,
&dev_attr_temp1_max_hyst.attr,
&dev_attr_alarms.attr,
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm92_group = {
.attrs = lm92_attributes,
};
/* The following function does more than just detection. If detection
succeeds, it also registers the new chip. */
static int lm92_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct lm92_data *data;
int err = 0;
char *name;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_WORD_DATA))
goto exit;
if (!(data = kzalloc(sizeof(struct lm92_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
/* Fill in enough client fields so that we can read from the chip,
which is required for identication */
new_client = &data->client;
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
new_client->driver = &lm92_driver;
new_client->flags = 0;
/* A negative kind means that the driver was loaded with no force
parameter (default), so we must identify the chip. */
if (kind < 0) {
u8 config = i2c_smbus_read_byte_data(new_client,
LM92_REG_CONFIG);
u16 man_id = i2c_smbus_read_word_data(new_client,
LM92_REG_MAN_ID);
if ((config & 0xe0) == 0x00
&& man_id == 0x0180) {
pr_info("lm92: Found National Semiconductor LM92 chip\n");
kind = lm92;
} else
if (max6635_check(new_client)) {
pr_info("lm92: Found Maxim MAX6635 chip\n");
kind = lm92; /* No separate prefix */
}
else
goto exit_free;
} else
if (kind == 0) /* Default to an LM92 if forced */
kind = lm92;
/* Give it the proper name */
if (kind == lm92) {
name = "lm92";
} else { /* Supposedly cannot happen */
dev_dbg(&new_client->dev, "Kind out of range?\n");
goto exit_free;
}
/* Fill in the remaining client fields */
strlcpy(new_client->name, name, I2C_NAME_SIZE);
data->valid = 0;
mutex_init(&data->update_lock);
/* Tell the i2c subsystem a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto exit_free;
/* Initialize the chipset */
lm92_init_client(new_client);
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj, &lm92_group)))
goto exit_detach;
data->hwmon_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove;
}
return 0;
exit_remove:
sysfs_remove_group(&new_client->dev.kobj, &lm92_group);
exit_detach:
i2c_detach_client(new_client);
exit_free:
kfree(data);
exit:
return err;
}
static int lm92_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
return 0;
return i2c_probe(adapter, &addr_data, lm92_detect);
}
static int lm92_detach_client(struct i2c_client *client)
{
struct lm92_data *data = i2c_get_clientdata(client);
int err;
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm92_group);
if ((err = i2c_detach_client(client)))
return err;
kfree(data);
return 0;
}
/*
* Module and driver stuff
*/
static struct i2c_driver lm92_driver = {
.driver = {
.name = "lm92",
},
.attach_adapter = lm92_attach_adapter,
.detach_client = lm92_detach_client,
};
static int __init sensors_lm92_init(void)
{
return i2c_add_driver(&lm92_driver);
}
static void __exit sensors_lm92_exit(void)
{
i2c_del_driver(&lm92_driver);
}
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("LM92/MAX6635 driver");
MODULE_LICENSE("GPL");
module_init(sensors_lm92_init);
module_exit(sensors_lm92_exit);
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