mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Guenter Roeck](/assets/img/avatar_default.png)
SENSORS_LIMIT and the generic clamp_val have the same functionality, and clamp_val is more efficient. This patch reduces text size by 9052 bytes and bss size by 11624 bytes for x86_64 builds. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: George Joseph <george.joseph@fairview5.com> Acked-by: Jean Delvare <khali@linux-fr.org>
527 lines
14 KiB
C
527 lines
14 KiB
C
/*
|
|
* Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
|
|
*
|
|
* The LM95245 is a sensor chip made by National Semiconductors.
|
|
* It reports up to two temperatures (its own plus an external one).
|
|
* Complete datasheet can be obtained from National's website at:
|
|
* http://www.national.com/ds.cgi/LM/LM95245.pdf
|
|
*
|
|
* This driver is based on lm95241.c
|
|
*
|
|
* 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/hwmon-sysfs.h>
|
|
#include <linux/err.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
#define DEVNAME "lm95245"
|
|
|
|
static const unsigned short normal_i2c[] = {
|
|
0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
|
|
|
|
/* LM95245 registers */
|
|
/* general registers */
|
|
#define LM95245_REG_RW_CONFIG1 0x03
|
|
#define LM95245_REG_RW_CONVERS_RATE 0x04
|
|
#define LM95245_REG_W_ONE_SHOT 0x0F
|
|
|
|
/* diode configuration */
|
|
#define LM95245_REG_RW_CONFIG2 0xBF
|
|
#define LM95245_REG_RW_REMOTE_OFFH 0x11
|
|
#define LM95245_REG_RW_REMOTE_OFFL 0x12
|
|
|
|
/* status registers */
|
|
#define LM95245_REG_R_STATUS1 0x02
|
|
#define LM95245_REG_R_STATUS2 0x33
|
|
|
|
/* limit registers */
|
|
#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
|
|
#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
|
|
#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
|
|
#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
|
|
|
|
/* temperature signed */
|
|
#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
|
|
#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
|
|
#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
|
|
#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
|
|
/* temperature unsigned */
|
|
#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
|
|
#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
|
|
|
|
/* id registers */
|
|
#define LM95245_REG_R_MAN_ID 0xFE
|
|
#define LM95245_REG_R_CHIP_ID 0xFF
|
|
|
|
/* LM95245 specific bitfields */
|
|
#define CFG_STOP 0x40
|
|
#define CFG_REMOTE_TCRIT_MASK 0x10
|
|
#define CFG_REMOTE_OS_MASK 0x08
|
|
#define CFG_LOCAL_TCRIT_MASK 0x04
|
|
#define CFG_LOCAL_OS_MASK 0x02
|
|
|
|
#define CFG2_OS_A0 0x40
|
|
#define CFG2_DIODE_FAULT_OS 0x20
|
|
#define CFG2_DIODE_FAULT_TCRIT 0x10
|
|
#define CFG2_REMOTE_TT 0x08
|
|
#define CFG2_REMOTE_FILTER_DIS 0x00
|
|
#define CFG2_REMOTE_FILTER_EN 0x06
|
|
|
|
/* conversation rate in ms */
|
|
#define RATE_CR0063 0x00
|
|
#define RATE_CR0364 0x01
|
|
#define RATE_CR1000 0x02
|
|
#define RATE_CR2500 0x03
|
|
|
|
#define STATUS1_DIODE_FAULT 0x04
|
|
#define STATUS1_RTCRIT 0x02
|
|
#define STATUS1_LOC 0x01
|
|
|
|
#define MANUFACTURER_ID 0x01
|
|
#define DEFAULT_REVISION 0xB3
|
|
|
|
static const u8 lm95245_reg_address[] = {
|
|
LM95245_REG_R_LOCAL_TEMPH_S,
|
|
LM95245_REG_R_LOCAL_TEMPL_S,
|
|
LM95245_REG_R_REMOTE_TEMPH_S,
|
|
LM95245_REG_R_REMOTE_TEMPL_S,
|
|
LM95245_REG_R_REMOTE_TEMPH_U,
|
|
LM95245_REG_R_REMOTE_TEMPL_U,
|
|
LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
|
|
LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
|
|
LM95245_REG_RW_COMMON_HYSTERESIS,
|
|
LM95245_REG_R_STATUS1,
|
|
};
|
|
|
|
/* Client data (each client gets its own) */
|
|
struct lm95245_data {
|
|
struct device *hwmon_dev;
|
|
struct mutex update_lock;
|
|
unsigned long last_updated; /* in jiffies */
|
|
unsigned long interval; /* in msecs */
|
|
bool valid; /* zero until following fields are valid */
|
|
/* registers values */
|
|
u8 regs[ARRAY_SIZE(lm95245_reg_address)];
|
|
u8 config1, config2;
|
|
};
|
|
|
|
/* Conversions */
|
|
static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
|
|
{
|
|
return val_h * 1000 + val_l * 1000 / 256;
|
|
}
|
|
|
|
static int temp_from_reg_signed(u8 val_h, u8 val_l)
|
|
{
|
|
if (val_h & 0x80)
|
|
return (val_h - 0x100) * 1000;
|
|
return temp_from_reg_unsigned(val_h, val_l);
|
|
}
|
|
|
|
static struct lm95245_data *lm95245_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated
|
|
+ msecs_to_jiffies(data->interval)) || !data->valid) {
|
|
int i;
|
|
|
|
dev_dbg(&client->dev, "Updating lm95245 data.\n");
|
|
for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
|
|
data->regs[i]
|
|
= i2c_smbus_read_byte_data(client,
|
|
lm95245_reg_address[i]);
|
|
data->last_updated = jiffies;
|
|
data->valid = 1;
|
|
}
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return data;
|
|
}
|
|
|
|
static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
|
|
{
|
|
int rate;
|
|
unsigned long interval;
|
|
|
|
rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
|
|
|
|
switch (rate) {
|
|
case RATE_CR0063:
|
|
interval = 63;
|
|
break;
|
|
case RATE_CR0364:
|
|
interval = 364;
|
|
break;
|
|
case RATE_CR1000:
|
|
interval = 1000;
|
|
break;
|
|
case RATE_CR2500:
|
|
default:
|
|
interval = 2500;
|
|
break;
|
|
}
|
|
|
|
return interval;
|
|
}
|
|
|
|
static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
|
|
unsigned long interval)
|
|
{
|
|
int rate;
|
|
|
|
if (interval <= 63) {
|
|
interval = 63;
|
|
rate = RATE_CR0063;
|
|
} else if (interval <= 364) {
|
|
interval = 364;
|
|
rate = RATE_CR0364;
|
|
} else if (interval <= 1000) {
|
|
interval = 1000;
|
|
rate = RATE_CR1000;
|
|
} else {
|
|
interval = 2500;
|
|
rate = RATE_CR2500;
|
|
}
|
|
|
|
i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
|
|
|
|
return interval;
|
|
}
|
|
|
|
/* Sysfs stuff */
|
|
static ssize_t show_input(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct lm95245_data *data = lm95245_update_device(dev);
|
|
int temp;
|
|
int index = to_sensor_dev_attr(attr)->index;
|
|
|
|
/*
|
|
* Index 0 (Local temp) is always signed
|
|
* Index 2 (Remote temp) has both signed and unsigned data
|
|
* use signed calculation for remote if signed bit is set
|
|
*/
|
|
if (index == 0 || data->regs[index] & 0x80)
|
|
temp = temp_from_reg_signed(data->regs[index],
|
|
data->regs[index + 1]);
|
|
else
|
|
temp = temp_from_reg_unsigned(data->regs[index + 2],
|
|
data->regs[index + 3]);
|
|
|
|
return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
|
|
}
|
|
|
|
static ssize_t show_limit(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct lm95245_data *data = lm95245_update_device(dev);
|
|
int index = to_sensor_dev_attr(attr)->index;
|
|
|
|
return snprintf(buf, PAGE_SIZE - 1, "%d\n",
|
|
data->regs[index] * 1000);
|
|
}
|
|
|
|
static ssize_t set_limit(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
int index = to_sensor_dev_attr(attr)->index;
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
val /= 1000;
|
|
|
|
val = clamp_val(val, 0, (index == 6 ? 127 : 255));
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
data->valid = 0;
|
|
|
|
i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t set_crit_hyst(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
val /= 1000;
|
|
|
|
val = clamp_val(val, 0, 31);
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
data->valid = 0;
|
|
|
|
/* shared crit hysteresis */
|
|
i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
|
|
val);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t show_type(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
|
|
return snprintf(buf, PAGE_SIZE - 1,
|
|
data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
|
|
}
|
|
|
|
static ssize_t set_type(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val) < 0)
|
|
return -EINVAL;
|
|
if (val != 1 && val != 2)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (val == 1)
|
|
data->config2 |= CFG2_REMOTE_TT;
|
|
else
|
|
data->config2 &= ~CFG2_REMOTE_TT;
|
|
|
|
data->valid = 0;
|
|
|
|
i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
|
|
data->config2);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct lm95245_data *data = lm95245_update_device(dev);
|
|
int index = to_sensor_dev_attr(attr)->index;
|
|
|
|
return snprintf(buf, PAGE_SIZE - 1, "%d\n",
|
|
!!(data->regs[9] & index));
|
|
}
|
|
|
|
static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct lm95245_data *data = lm95245_update_device(dev);
|
|
|
|
return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
|
|
}
|
|
|
|
static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
data->interval = lm95245_set_conversion_rate(client, val);
|
|
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
|
|
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit,
|
|
set_limit, 6);
|
|
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
|
|
set_crit_hyst, 8);
|
|
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
|
|
STATUS1_LOC);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit,
|
|
set_limit, 7);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_limit,
|
|
set_crit_hyst, 8);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
|
|
STATUS1_RTCRIT);
|
|
static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type,
|
|
set_type, 0);
|
|
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
|
|
STATUS1_DIODE_FAULT);
|
|
|
|
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
|
|
set_interval);
|
|
|
|
static struct attribute *lm95245_attributes[] = {
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_type.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_fault.dev_attr.attr,
|
|
&dev_attr_update_interval.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group lm95245_group = {
|
|
.attrs = lm95245_attributes,
|
|
};
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int lm95245_detect(struct i2c_client *new_client,
|
|
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 (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
|
|
!= MANUFACTURER_ID
|
|
|| i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
|
|
!= DEFAULT_REVISION)
|
|
return -ENODEV;
|
|
|
|
strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
|
|
return 0;
|
|
}
|
|
|
|
static void lm95245_init_client(struct i2c_client *client)
|
|
{
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
|
|
data->valid = 0;
|
|
data->interval = lm95245_read_conversion_rate(client);
|
|
|
|
data->config1 = i2c_smbus_read_byte_data(client,
|
|
LM95245_REG_RW_CONFIG1);
|
|
data->config2 = i2c_smbus_read_byte_data(client,
|
|
LM95245_REG_RW_CONFIG2);
|
|
|
|
if (data->config1 & CFG_STOP) {
|
|
/* Clear the standby bit */
|
|
data->config1 &= ~CFG_STOP;
|
|
i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
|
|
data->config1);
|
|
}
|
|
}
|
|
|
|
static int lm95245_probe(struct i2c_client *new_client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct lm95245_data *data;
|
|
int err;
|
|
|
|
data = devm_kzalloc(&new_client->dev, sizeof(struct lm95245_data),
|
|
GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(new_client, data);
|
|
mutex_init(&data->update_lock);
|
|
|
|
/* Initialize the LM95245 chip */
|
|
lm95245_init_client(new_client);
|
|
|
|
/* Register sysfs hooks */
|
|
err = sysfs_create_group(&new_client->dev.kobj, &lm95245_group);
|
|
if (err)
|
|
return err;
|
|
|
|
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, &lm95245_group);
|
|
return err;
|
|
}
|
|
|
|
static int lm95245_remove(struct i2c_client *client)
|
|
{
|
|
struct lm95245_data *data = i2c_get_clientdata(client);
|
|
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &lm95245_group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Driver data (common to all clients) */
|
|
static const struct i2c_device_id lm95245_id[] = {
|
|
{ DEVNAME, 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lm95245_id);
|
|
|
|
static struct i2c_driver lm95245_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = DEVNAME,
|
|
},
|
|
.probe = lm95245_probe,
|
|
.remove = lm95245_remove,
|
|
.id_table = lm95245_id,
|
|
.detect = lm95245_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
module_i2c_driver(lm95245_driver);
|
|
|
|
MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
|
|
MODULE_DESCRIPTION("LM95245 sensor driver");
|
|
MODULE_LICENSE("GPL");
|