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linux/drivers/hwmon/lm63.c
Jean Delvare d5957be2f1 hwmon: (lm63) Convert to a new-style i2c driver 
The new-style lm63 driver implements the optional detect() callback
to cover the use cases of the legacy driver.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
2008-07-16 19:30:13 +02:00

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/*
* lm63.c - driver for the National Semiconductor LM63 temperature sensor
* with integrated fan control
* Copyright (C) 2004-2008 Jean Delvare <khali@linux-fr.org>
* Based on the lm90 driver.
*
* The LM63 is a sensor chip made by National Semiconductor. It measures
* two temperatures (its own and one external one) and the speed of one
* fan, those speed it can additionally control. Complete datasheet can be
* obtained from National's website at:
* http://www.national.com/pf/LM/LM63.html
*
* The LM63 is basically an LM86 with fan speed monitoring and control
* capabilities added. It misses some of the LM86 features though:
* - No low limit for local temperature.
* - No critical limit for local temperature.
* - Critical limit for remote temperature can be changed only once. We
* will consider that the critical limit is read-only.
*
* The datasheet isn't very clear about what the tachometer reading is.
* I had a explanation from National Semiconductor though. The two lower
* bits of the read value have to be masked out. The value is still 16 bit
* in width.
*
* 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-sysfs.h>
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
/*
* Addresses to scan
* Address is fully defined internally and cannot be changed.
*/
static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
/*
* Insmod parameters
*/
I2C_CLIENT_INSMOD_1(lm63);
/*
* The LM63 registers
*/
#define LM63_REG_CONFIG1 0x03
#define LM63_REG_CONFIG2 0xBF
#define LM63_REG_CONFIG_FAN 0x4A
#define LM63_REG_TACH_COUNT_MSB 0x47
#define LM63_REG_TACH_COUNT_LSB 0x46
#define LM63_REG_TACH_LIMIT_MSB 0x49
#define LM63_REG_TACH_LIMIT_LSB 0x48
#define LM63_REG_PWM_VALUE 0x4C
#define LM63_REG_PWM_FREQ 0x4D
#define LM63_REG_LOCAL_TEMP 0x00
#define LM63_REG_LOCAL_HIGH 0x05
#define LM63_REG_REMOTE_TEMP_MSB 0x01
#define LM63_REG_REMOTE_TEMP_LSB 0x10
#define LM63_REG_REMOTE_OFFSET_MSB 0x11
#define LM63_REG_REMOTE_OFFSET_LSB 0x12
#define LM63_REG_REMOTE_HIGH_MSB 0x07
#define LM63_REG_REMOTE_HIGH_LSB 0x13
#define LM63_REG_REMOTE_LOW_MSB 0x08
#define LM63_REG_REMOTE_LOW_LSB 0x14
#define LM63_REG_REMOTE_TCRIT 0x19
#define LM63_REG_REMOTE_TCRIT_HYST 0x21
#define LM63_REG_ALERT_STATUS 0x02
#define LM63_REG_ALERT_MASK 0x16
#define LM63_REG_MAN_ID 0xFE
#define LM63_REG_CHIP_ID 0xFF
/*
* Conversions and various macros
* For tachometer counts, the LM63 uses 16-bit values.
* For local temperature and high limit, remote critical limit and hysteresis
* value, it uses signed 8-bit values with LSB = 1 degree Celsius.
* For remote temperature, low and high limits, it uses signed 11-bit values
* with LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
*/
#define FAN_FROM_REG(reg) ((reg) == 0xFFFC || (reg) == 0 ? 0 : \
5400000 / (reg))
#define FAN_TO_REG(val) ((val) <= 82 ? 0xFFFC : \
(5400000 / (val)) & 0xFFFC)
#define TEMP8_FROM_REG(reg) ((reg) * 1000)
#define TEMP8_TO_REG(val) ((val) <= -128000 ? -128 : \
(val) >= 127000 ? 127 : \
(val) < 0 ? ((val) - 500) / 1000 : \
((val) + 500) / 1000)
#define TEMP11_FROM_REG(reg) ((reg) / 32 * 125)
#define TEMP11_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
(val) >= 127875 ? 0x7FE0 : \
(val) < 0 ? ((val) - 62) / 125 * 32 : \
((val) + 62) / 125 * 32)
#define HYST_TO_REG(val) ((val) <= 0 ? 0 : \
(val) >= 127000 ? 127 : \
((val) + 500) / 1000)
/*
* Functions declaration
*/
static int lm63_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int lm63_remove(struct i2c_client *client);
static struct lm63_data *lm63_update_device(struct device *dev);
static int lm63_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info);
static void lm63_init_client(struct i2c_client *client);
/*
* Driver data (common to all clients)
*/
static const struct i2c_device_id lm63_id[] = {
{ "lm63", lm63 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm63_id);
static struct i2c_driver lm63_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm63",
},
.probe = lm63_probe,
.remove = lm63_remove,
.id_table = lm63_id,
.detect = lm63_detect,
.address_data = &addr_data,
};
/*
* Client data (each client gets its own)
*/
struct lm63_data {
struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
/* registers values */
u8 config, config_fan;
u16 fan[2]; /* 0: input
1: low limit */
u8 pwm1_freq;
u8 pwm1_value;
s8 temp8[3]; /* 0: local input
1: local high limit
2: remote critical limit */
s16 temp11[3]; /* 0: remote input
1: remote low limit
2: remote high limit */
u8 temp2_crit_hyst;
u8 alarms;
};
/*
* Sysfs callback functions and files
*/
static ssize_t show_fan(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm63_data *data = lm63_update_device(dev);
return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index]));
}
static ssize_t set_fan(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
unsigned long val = simple_strtoul(buf, NULL, 10);
mutex_lock(&data->update_lock);
data->fan[1] = FAN_TO_REG(val);
i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_LSB,
data->fan[1] & 0xFF);
i2c_smbus_write_byte_data(client, LM63_REG_TACH_LIMIT_MSB,
data->fan[1] >> 8);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_pwm1(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct lm63_data *data = lm63_update_device(dev);
return sprintf(buf, "%d\n", data->pwm1_value >= 2 * data->pwm1_freq ?
255 : (data->pwm1_value * 255 + data->pwm1_freq) /
(2 * data->pwm1_freq));
}
static ssize_t set_pwm1(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
unsigned long val;
if (!(data->config_fan & 0x20)) /* register is read-only */
return -EPERM;
val = simple_strtoul(buf, NULL, 10);
mutex_lock(&data->update_lock);
data->pwm1_value = val <= 0 ? 0 :
val >= 255 ? 2 * data->pwm1_freq :
(val * data->pwm1_freq * 2 + 127) / 255;
i2c_smbus_write_byte_data(client, LM63_REG_PWM_VALUE, data->pwm1_value);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_pwm1_enable(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct lm63_data *data = lm63_update_device(dev);
return sprintf(buf, "%d\n", data->config_fan & 0x20 ? 1 : 2);
}
static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm63_data *data = lm63_update_device(dev);
return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index]));
}
static ssize_t set_temp8(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
long val = simple_strtol(buf, NULL, 10);
mutex_lock(&data->update_lock);
data->temp8[1] = TEMP8_TO_REG(val);
i2c_smbus_write_byte_data(client, LM63_REG_LOCAL_HIGH, data->temp8[1]);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm63_data *data = lm63_update_device(dev);
return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[attr->index]));
}
static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
static const u8 reg[4] = {
LM63_REG_REMOTE_LOW_MSB,
LM63_REG_REMOTE_LOW_LSB,
LM63_REG_REMOTE_HIGH_MSB,
LM63_REG_REMOTE_HIGH_LSB,
};
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
long val = simple_strtol(buf, NULL, 10);
int nr = attr->index;
mutex_lock(&data->update_lock);
data->temp11[nr] = TEMP11_TO_REG(val);
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
data->temp11[nr] >> 8);
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
data->temp11[nr] & 0xff);
mutex_unlock(&data->update_lock);
return count;
}
/* Hysteresis register holds a relative value, while we want to present
an absolute to user-space */
static ssize_t show_temp2_crit_hyst(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct lm63_data *data = lm63_update_device(dev);
return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[2])
- TEMP8_FROM_REG(data->temp2_crit_hyst));
}
/* And now the other way around, user-space provides an absolute
hysteresis value and we have to store a relative one */
static ssize_t set_temp2_crit_hyst(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
long val = simple_strtol(buf, NULL, 10);
long hyst;
mutex_lock(&data->update_lock);
hyst = TEMP8_FROM_REG(data->temp8[2]) - val;
i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
HYST_TO_REG(hyst));
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
char *buf)
{
struct lm63_data *data = lm63_update_device(dev);
return sprintf(buf, "%u\n", data->alarms);
}
static ssize_t show_alarm(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm63_data *data = lm63_update_device(dev);
int bitnr = attr->index;
return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}
static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan,
set_fan, 1);
static DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm1, set_pwm1);
static DEVICE_ATTR(pwm1_enable, S_IRUGO, show_pwm1_enable, NULL);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 1);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 2);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp8, NULL, 2);
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
set_temp2_crit_hyst);
/* Individual alarm files */
static SENSOR_DEVICE_ATTR(fan1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
/* Raw alarm file for compatibility */
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static struct attribute *lm63_attributes[] = {
&dev_attr_pwm1.attr,
&dev_attr_pwm1_enable.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_crit.dev_attr.attr,
&dev_attr_temp2_crit_hyst.attr,
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&dev_attr_alarms.attr,
NULL
};
static const struct attribute_group lm63_group = {
.attrs = lm63_attributes,
};
static struct attribute *lm63_attributes_fan1[] = {
&sensor_dev_attr_fan1_input.dev_attr.attr,
&sensor_dev_attr_fan1_min.dev_attr.attr,
&sensor_dev_attr_fan1_min_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm63_group_fan1 = {
.attrs = lm63_attributes_fan1,
};
/*
* Real code
*/
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm63_detect(struct i2c_client *new_client, int kind,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = new_client->adapter;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
if (kind < 0) { /* must identify */
u8 man_id, chip_id, reg_config1, reg_config2;
u8 reg_alert_status, reg_alert_mask;
man_id = i2c_smbus_read_byte_data(new_client,
LM63_REG_MAN_ID);
chip_id = i2c_smbus_read_byte_data(new_client,
LM63_REG_CHIP_ID);
reg_config1 = i2c_smbus_read_byte_data(new_client,
LM63_REG_CONFIG1);
reg_config2 = i2c_smbus_read_byte_data(new_client,
LM63_REG_CONFIG2);
reg_alert_status = i2c_smbus_read_byte_data(new_client,
LM63_REG_ALERT_STATUS);
reg_alert_mask = i2c_smbus_read_byte_data(new_client,
LM63_REG_ALERT_MASK);
if (man_id == 0x01 /* National Semiconductor */
&& chip_id == 0x41 /* LM63 */
&& (reg_config1 & 0x18) == 0x00
&& (reg_config2 & 0xF8) == 0x00
&& (reg_alert_status & 0x20) == 0x00
&& (reg_alert_mask & 0xA4) == 0xA4) {
kind = lm63;
} else { /* failed */
dev_dbg(&adapter->dev, "Unsupported chip "
"(man_id=0x%02X, chip_id=0x%02X).\n",
man_id, chip_id);
return -ENODEV;
}
}
strlcpy(info->type, "lm63", I2C_NAME_SIZE);
return 0;
}
static int lm63_probe(struct i2c_client *new_client,
const struct i2c_device_id *id)
{
struct lm63_data *data;
int err;
data = kzalloc(sizeof(struct lm63_data), GFP_KERNEL);
if (!data) {
err = -ENOMEM;
goto exit;
}
i2c_set_clientdata(new_client, data);
data->valid = 0;
mutex_init(&data->update_lock);
/* Initialize the LM63 chip */
lm63_init_client(new_client);
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj,
&lm63_group)))
goto exit_free;
if (data->config & 0x04) { /* tachometer enabled */
if ((err = sysfs_create_group(&new_client->dev.kobj,
&lm63_group_fan1)))
goto exit_remove_files;
}
data->hwmon_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);
goto exit_remove_files;
}
return 0;
exit_remove_files:
sysfs_remove_group(&new_client->dev.kobj, &lm63_group);
sysfs_remove_group(&new_client->dev.kobj, &lm63_group_fan1);
exit_free:
kfree(data);
exit:
return err;
}
/* Idealy we shouldn't have to initialize anything, since the BIOS
should have taken care of everything */
static void lm63_init_client(struct i2c_client *client)
{
struct lm63_data *data = i2c_get_clientdata(client);
data->config = i2c_smbus_read_byte_data(client, LM63_REG_CONFIG1);
data->config_fan = i2c_smbus_read_byte_data(client,
LM63_REG_CONFIG_FAN);
/* Start converting if needed */
if (data->config & 0x40) { /* standby */
dev_dbg(&client->dev, "Switching to operational mode\n");
data->config &= 0xA7;
i2c_smbus_write_byte_data(client, LM63_REG_CONFIG1,
data->config);
}
/* We may need pwm1_freq before ever updating the client data */
data->pwm1_freq = i2c_smbus_read_byte_data(client, LM63_REG_PWM_FREQ);
if (data->pwm1_freq == 0)
data->pwm1_freq = 1;
/* Show some debug info about the LM63 configuration */
dev_dbg(&client->dev, "Alert/tach pin configured for %s\n",
(data->config & 0x04) ? "tachometer input" :
"alert output");
dev_dbg(&client->dev, "PWM clock %s kHz, output frequency %u Hz\n",
(data->config_fan & 0x08) ? "1.4" : "360",
((data->config_fan & 0x08) ? 700 : 180000) / data->pwm1_freq);
dev_dbg(&client->dev, "PWM output active %s, %s mode\n",
(data->config_fan & 0x10) ? "low" : "high",
(data->config_fan & 0x20) ? "manual" : "auto");
}
static int lm63_remove(struct i2c_client *client)
{
struct lm63_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(&client->dev.kobj, &lm63_group);
sysfs_remove_group(&client->dev.kobj, &lm63_group_fan1);
kfree(data);
return 0;
}
static struct lm63_data *lm63_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
if (data->config & 0x04) { /* tachometer enabled */
/* order matters for fan1_input */
data->fan[0] = i2c_smbus_read_byte_data(client,
LM63_REG_TACH_COUNT_LSB) & 0xFC;
data->fan[0] |= i2c_smbus_read_byte_data(client,
LM63_REG_TACH_COUNT_MSB) << 8;
data->fan[1] = (i2c_smbus_read_byte_data(client,
LM63_REG_TACH_LIMIT_LSB) & 0xFC)
| (i2c_smbus_read_byte_data(client,
LM63_REG_TACH_LIMIT_MSB) << 8);
}
data->pwm1_freq = i2c_smbus_read_byte_data(client,
LM63_REG_PWM_FREQ);
if (data->pwm1_freq == 0)
data->pwm1_freq = 1;
data->pwm1_value = i2c_smbus_read_byte_data(client,
LM63_REG_PWM_VALUE);
data->temp8[0] = i2c_smbus_read_byte_data(client,
LM63_REG_LOCAL_TEMP);
data->temp8[1] = i2c_smbus_read_byte_data(client,
LM63_REG_LOCAL_HIGH);
/* order matters for temp2_input */
data->temp11[0] = i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_TEMP_MSB) << 8;
data->temp11[0] |= i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_TEMP_LSB);
data->temp11[1] = (i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_LOW_MSB) << 8)
| i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_LOW_LSB);
data->temp11[2] = (i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_HIGH_MSB) << 8)
| i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_HIGH_LSB);
data->temp8[2] = i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_TCRIT);
data->temp2_crit_hyst = i2c_smbus_read_byte_data(client,
LM63_REG_REMOTE_TCRIT_HYST);
data->alarms = i2c_smbus_read_byte_data(client,
LM63_REG_ALERT_STATUS) & 0x7F;
data->last_updated = jiffies;
data->valid = 1;
}
mutex_unlock(&data->update_lock);
return data;
}
static int __init sensors_lm63_init(void)
{
return i2c_add_driver(&lm63_driver);
}
static void __exit sensors_lm63_exit(void)
{
i2c_del_driver(&lm63_driver);
}
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
MODULE_DESCRIPTION("LM63 driver");
MODULE_LICENSE("GPL");
module_init(sensors_lm63_init);
module_exit(sensors_lm63_exit);
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