2010-05-27 17:58:57 +00:00
|
|
|
/* Texas Instruments TMP102 SMBus temperature sensor driver
|
2010-05-27 17:58:56 +00:00
|
|
|
*
|
2010-05-27 17:58:57 +00:00
|
|
|
* Copyright (C) 2010 Steven King <sfking@fdwdc.com>
|
2010-05-27 17:58:56 +00:00
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
#include <linux/delay.h>
|
2010-05-27 17:58:56 +00:00
|
|
|
#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>
|
2010-05-27 17:58:57 +00:00
|
|
|
#include <linux/device.h>
|
2012-10-10 13:25:56 +00:00
|
|
|
#include <linux/jiffies.h>
|
2013-07-16 18:57:51 +00:00
|
|
|
#include <linux/thermal.h>
|
|
|
|
#include <linux/of.h>
|
2010-05-27 17:58:56 +00:00
|
|
|
|
|
|
|
#define DRIVER_NAME "tmp102"
|
|
|
|
|
|
|
|
#define TMP102_TEMP_REG 0x00
|
|
|
|
#define TMP102_CONF_REG 0x01
|
|
|
|
/* note: these bit definitions are byte swapped */
|
|
|
|
#define TMP102_CONF_SD 0x0100
|
|
|
|
#define TMP102_CONF_TM 0x0200
|
|
|
|
#define TMP102_CONF_POL 0x0400
|
|
|
|
#define TMP102_CONF_F0 0x0800
|
|
|
|
#define TMP102_CONF_F1 0x1000
|
|
|
|
#define TMP102_CONF_R0 0x2000
|
|
|
|
#define TMP102_CONF_R1 0x4000
|
|
|
|
#define TMP102_CONF_OS 0x8000
|
|
|
|
#define TMP102_CONF_EM 0x0010
|
|
|
|
#define TMP102_CONF_AL 0x0020
|
|
|
|
#define TMP102_CONF_CR0 0x0040
|
|
|
|
#define TMP102_CONF_CR1 0x0080
|
|
|
|
#define TMP102_TLOW_REG 0x02
|
|
|
|
#define TMP102_THIGH_REG 0x03
|
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
#define CONVERSION_TIME_MS 35 /* in milli-seconds */
|
|
|
|
|
2010-05-27 17:58:56 +00:00
|
|
|
struct tmp102 {
|
2014-02-02 18:08:09 +00:00
|
|
|
struct i2c_client *client;
|
2010-05-27 17:58:56 +00:00
|
|
|
struct mutex lock;
|
2010-05-27 17:58:59 +00:00
|
|
|
u16 config_orig;
|
2010-05-27 17:58:56 +00:00
|
|
|
unsigned long last_update;
|
2016-06-20 03:34:57 +00:00
|
|
|
unsigned long ready_time;
|
|
|
|
bool valid;
|
2010-05-27 17:58:56 +00:00
|
|
|
int temp[3];
|
|
|
|
};
|
|
|
|
|
2010-05-27 17:58:57 +00:00
|
|
|
/* convert left adjusted 13-bit TMP102 register value to milliCelsius */
|
|
|
|
static inline int tmp102_reg_to_mC(s16 val)
|
2010-05-27 17:58:56 +00:00
|
|
|
{
|
2010-05-27 17:58:57 +00:00
|
|
|
return ((val & ~0x01) * 1000) / 128;
|
2010-05-27 17:58:56 +00:00
|
|
|
}
|
|
|
|
|
2010-05-27 17:58:57 +00:00
|
|
|
/* convert milliCelsius to left adjusted 13-bit TMP102 register value */
|
|
|
|
static inline u16 tmp102_mC_to_reg(int val)
|
2010-05-27 17:58:56 +00:00
|
|
|
{
|
|
|
|
return (val * 128) / 1000;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const u8 tmp102_reg[] = {
|
|
|
|
TMP102_TEMP_REG,
|
|
|
|
TMP102_TLOW_REG,
|
|
|
|
TMP102_THIGH_REG,
|
|
|
|
};
|
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
static void tmp102_update_device(struct device *dev)
|
2010-05-27 17:58:56 +00:00
|
|
|
{
|
2014-02-02 18:08:09 +00:00
|
|
|
struct tmp102 *tmp102 = dev_get_drvdata(dev);
|
|
|
|
struct i2c_client *client = tmp102->client;
|
2010-05-27 17:58:56 +00:00
|
|
|
|
|
|
|
mutex_lock(&tmp102->lock);
|
2016-06-20 03:34:57 +00:00
|
|
|
if (!tmp102->valid ||
|
|
|
|
time_after(jiffies, tmp102->last_update + HZ / 3)) {
|
2010-05-27 17:58:56 +00:00
|
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) {
|
2011-11-04 11:00:47 +00:00
|
|
|
int status = i2c_smbus_read_word_swapped(client,
|
|
|
|
tmp102_reg[i]);
|
2010-05-27 17:58:56 +00:00
|
|
|
if (status > -1)
|
|
|
|
tmp102->temp[i] = tmp102_reg_to_mC(status);
|
|
|
|
}
|
|
|
|
tmp102->last_update = jiffies;
|
2016-06-20 03:34:57 +00:00
|
|
|
tmp102->valid = true;
|
2010-05-27 17:58:56 +00:00
|
|
|
}
|
|
|
|
mutex_unlock(&tmp102->lock);
|
|
|
|
}
|
|
|
|
|
2015-07-24 06:12:54 +00:00
|
|
|
static int tmp102_read_temp(void *dev, int *temp)
|
2013-07-16 18:57:51 +00:00
|
|
|
{
|
2016-06-20 03:34:57 +00:00
|
|
|
struct tmp102 *tmp102 = dev_get_drvdata(dev);
|
2013-07-16 18:57:51 +00:00
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
if (time_before(jiffies, tmp102->ready_time)) {
|
2015-12-01 16:10:21 +00:00
|
|
|
dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
tmp102_update_device(dev);
|
|
|
|
|
2013-07-16 18:57:51 +00:00
|
|
|
*temp = tmp102->temp[0];
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-05-27 17:58:56 +00:00
|
|
|
static ssize_t tmp102_show_temp(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
2016-06-20 03:34:57 +00:00
|
|
|
struct tmp102 *tmp102 = dev_get_drvdata(dev);
|
2010-05-27 17:58:56 +00:00
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
if (time_before(jiffies, tmp102->ready_time))
|
2015-12-01 16:10:21 +00:00
|
|
|
return -EAGAIN;
|
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
tmp102_update_device(dev);
|
|
|
|
|
2010-05-27 17:58:56 +00:00
|
|
|
return sprintf(buf, "%d\n", tmp102->temp[sda->index]);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t tmp102_set_temp(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
|
|
|
{
|
|
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
2014-02-02 18:08:09 +00:00
|
|
|
struct tmp102 *tmp102 = dev_get_drvdata(dev);
|
|
|
|
struct i2c_client *client = tmp102->client;
|
2010-05-27 17:58:56 +00:00
|
|
|
long val;
|
2010-05-27 17:58:57 +00:00
|
|
|
int status;
|
2010-05-27 17:58:56 +00:00
|
|
|
|
2012-01-04 19:58:52 +00:00
|
|
|
if (kstrtol(buf, 10, &val) < 0)
|
2010-05-27 17:58:56 +00:00
|
|
|
return -EINVAL;
|
2013-01-09 16:09:34 +00:00
|
|
|
val = clamp_val(val, -256000, 255000);
|
2010-05-27 17:58:57 +00:00
|
|
|
|
2010-05-27 17:58:56 +00:00
|
|
|
mutex_lock(&tmp102->lock);
|
2010-05-27 17:58:57 +00:00
|
|
|
tmp102->temp[sda->index] = val;
|
2011-11-04 11:00:47 +00:00
|
|
|
status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index],
|
|
|
|
tmp102_mC_to_reg(val));
|
2010-05-27 17:58:56 +00:00
|
|
|
mutex_unlock(&tmp102->lock);
|
|
|
|
return status ? : count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0);
|
|
|
|
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp,
|
|
|
|
tmp102_set_temp, 1);
|
|
|
|
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp,
|
|
|
|
tmp102_set_temp, 2);
|
|
|
|
|
2014-02-02 18:08:09 +00:00
|
|
|
static struct attribute *tmp102_attrs[] = {
|
2010-05-27 17:58:56 +00:00
|
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
|
|
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
|
|
NULL
|
|
|
|
};
|
2014-02-02 18:08:09 +00:00
|
|
|
ATTRIBUTE_GROUPS(tmp102);
|
2010-05-27 17:58:56 +00:00
|
|
|
|
|
|
|
#define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1)
|
|
|
|
#define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL)
|
|
|
|
|
2014-11-08 01:24:39 +00:00
|
|
|
static const struct thermal_zone_of_device_ops tmp102_of_thermal_ops = {
|
|
|
|
.get_temp = tmp102_read_temp,
|
|
|
|
};
|
|
|
|
|
2016-06-20 03:09:54 +00:00
|
|
|
static void tmp102_restore_config(void *data)
|
|
|
|
{
|
|
|
|
struct tmp102 *tmp102 = data;
|
|
|
|
struct i2c_client *client = tmp102->client;
|
|
|
|
|
|
|
|
i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
|
|
|
|
tmp102->config_orig);
|
|
|
|
}
|
|
|
|
|
2012-11-19 18:22:35 +00:00
|
|
|
static int tmp102_probe(struct i2c_client *client,
|
2010-05-27 17:58:56 +00:00
|
|
|
const struct i2c_device_id *id)
|
|
|
|
{
|
2014-02-02 22:22:30 +00:00
|
|
|
struct device *dev = &client->dev;
|
2014-02-02 18:08:09 +00:00
|
|
|
struct device *hwmon_dev;
|
2010-05-27 17:58:56 +00:00
|
|
|
struct tmp102 *tmp102;
|
|
|
|
int status;
|
|
|
|
|
2010-05-27 17:58:57 +00:00
|
|
|
if (!i2c_check_functionality(client->adapter,
|
2010-05-27 17:58:56 +00:00
|
|
|
I2C_FUNC_SMBUS_WORD_DATA)) {
|
2014-02-02 22:22:30 +00:00
|
|
|
dev_err(dev,
|
2013-01-10 18:01:24 +00:00
|
|
|
"adapter doesn't support SMBus word transactions\n");
|
2010-05-27 17:58:56 +00:00
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
2014-02-02 22:22:30 +00:00
|
|
|
tmp102 = devm_kzalloc(dev, sizeof(*tmp102), GFP_KERNEL);
|
2012-06-02 18:35:52 +00:00
|
|
|
if (!tmp102)
|
2010-05-27 17:58:56 +00:00
|
|
|
return -ENOMEM;
|
2012-06-02 18:35:52 +00:00
|
|
|
|
2010-05-27 17:58:56 +00:00
|
|
|
i2c_set_clientdata(client, tmp102);
|
2014-02-02 18:08:09 +00:00
|
|
|
tmp102->client = client;
|
2010-05-27 17:58:56 +00:00
|
|
|
|
2011-11-04 11:00:47 +00:00
|
|
|
status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
|
2010-05-27 17:58:59 +00:00
|
|
|
if (status < 0) {
|
2014-02-02 22:22:30 +00:00
|
|
|
dev_err(dev, "error reading config register\n");
|
2012-06-02 18:35:52 +00:00
|
|
|
return status;
|
2010-05-27 17:58:59 +00:00
|
|
|
}
|
|
|
|
tmp102->config_orig = status;
|
2016-06-20 03:09:54 +00:00
|
|
|
|
|
|
|
devm_add_action(dev, tmp102_restore_config, tmp102);
|
|
|
|
|
2011-11-04 11:00:47 +00:00
|
|
|
status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG,
|
|
|
|
TMP102_CONFIG);
|
2010-05-27 17:58:57 +00:00
|
|
|
if (status < 0) {
|
2014-02-02 22:22:30 +00:00
|
|
|
dev_err(dev, "error writing config register\n");
|
2016-06-20 03:09:54 +00:00
|
|
|
return status;
|
2010-05-27 17:58:57 +00:00
|
|
|
}
|
2011-11-04 11:00:47 +00:00
|
|
|
status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
|
2010-05-27 17:58:56 +00:00
|
|
|
if (status < 0) {
|
2014-02-02 22:22:30 +00:00
|
|
|
dev_err(dev, "error reading config register\n");
|
2016-06-20 03:09:54 +00:00
|
|
|
return status;
|
2010-05-27 17:58:56 +00:00
|
|
|
}
|
|
|
|
status &= ~TMP102_CONFIG_RD_ONLY;
|
|
|
|
if (status != TMP102_CONFIG) {
|
2014-02-02 22:22:30 +00:00
|
|
|
dev_err(dev, "config settings did not stick\n");
|
2016-06-20 03:09:54 +00:00
|
|
|
return -ENODEV;
|
2010-05-27 17:58:56 +00:00
|
|
|
}
|
2016-06-20 03:34:57 +00:00
|
|
|
|
2010-05-27 17:58:56 +00:00
|
|
|
mutex_init(&tmp102->lock);
|
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
tmp102->ready_time = jiffies;
|
|
|
|
if (tmp102->config_orig & TMP102_CONF_SD) {
|
|
|
|
/*
|
|
|
|
* Mark that we are not ready with data until the first
|
|
|
|
* conversion is complete
|
|
|
|
*/
|
|
|
|
tmp102->ready_time += msecs_to_jiffies(CONVERSION_TIME_MS);
|
|
|
|
}
|
|
|
|
|
2016-06-20 03:09:54 +00:00
|
|
|
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
|
|
|
|
tmp102,
|
|
|
|
tmp102_groups);
|
2014-02-02 18:08:09 +00:00
|
|
|
if (IS_ERR(hwmon_dev)) {
|
2014-02-02 22:22:30 +00:00
|
|
|
dev_dbg(dev, "unable to register hwmon device\n");
|
2016-06-20 03:09:54 +00:00
|
|
|
return PTR_ERR(hwmon_dev);
|
2010-05-27 17:58:56 +00:00
|
|
|
}
|
2016-03-09 21:02:54 +00:00
|
|
|
devm_thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev,
|
|
|
|
&tmp102_of_thermal_ops);
|
2013-07-16 18:57:51 +00:00
|
|
|
|
2014-02-02 22:22:30 +00:00
|
|
|
dev_info(dev, "initialized\n");
|
2010-05-27 17:58:56 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2015-02-03 15:01:58 +00:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
2010-05-27 17:58:56 +00:00
|
|
|
static int tmp102_suspend(struct device *dev)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
2010-05-27 17:58:58 +00:00
|
|
|
int config;
|
2010-05-27 17:58:56 +00:00
|
|
|
|
2011-11-04 11:00:47 +00:00
|
|
|
config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
|
2010-05-27 17:58:58 +00:00
|
|
|
if (config < 0)
|
|
|
|
return config;
|
2010-05-27 17:58:56 +00:00
|
|
|
|
2010-05-27 17:58:58 +00:00
|
|
|
config |= TMP102_CONF_SD;
|
2011-11-04 11:00:47 +00:00
|
|
|
return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
|
2010-05-27 17:58:56 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int tmp102_resume(struct device *dev)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = to_i2c_client(dev);
|
2016-06-20 03:34:57 +00:00
|
|
|
struct tmp102 *tmp102 = i2c_get_clientdata(client);
|
2010-05-27 17:58:58 +00:00
|
|
|
int config;
|
2010-05-27 17:58:56 +00:00
|
|
|
|
2011-11-04 11:00:47 +00:00
|
|
|
config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG);
|
2010-05-27 17:58:58 +00:00
|
|
|
if (config < 0)
|
|
|
|
return config;
|
2010-05-27 17:58:56 +00:00
|
|
|
|
2016-06-20 03:34:57 +00:00
|
|
|
tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS);
|
|
|
|
|
2010-05-27 17:58:58 +00:00
|
|
|
config &= ~TMP102_CONF_SD;
|
2011-11-04 11:00:47 +00:00
|
|
|
return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config);
|
2010-05-27 17:58:56 +00:00
|
|
|
}
|
|
|
|
#endif /* CONFIG_PM */
|
|
|
|
|
2015-02-03 15:01:58 +00:00
|
|
|
static SIMPLE_DEV_PM_OPS(tmp102_dev_pm_ops, tmp102_suspend, tmp102_resume);
|
|
|
|
|
2010-05-27 17:58:56 +00:00
|
|
|
static const struct i2c_device_id tmp102_id[] = {
|
2010-05-27 17:58:57 +00:00
|
|
|
{ "tmp102", 0 },
|
2010-05-27 17:58:56 +00:00
|
|
|
{ }
|
|
|
|
};
|
2010-05-27 17:58:57 +00:00
|
|
|
MODULE_DEVICE_TABLE(i2c, tmp102_id);
|
2010-05-27 17:58:56 +00:00
|
|
|
|
|
|
|
static struct i2c_driver tmp102_driver = {
|
|
|
|
.driver.name = DRIVER_NAME,
|
2015-02-03 15:01:58 +00:00
|
|
|
.driver.pm = &tmp102_dev_pm_ops,
|
2010-05-27 17:58:56 +00:00
|
|
|
.probe = tmp102_probe,
|
|
|
|
.id_table = tmp102_id,
|
|
|
|
};
|
|
|
|
|
2012-01-20 07:38:18 +00:00
|
|
|
module_i2c_driver(tmp102_driver);
|
2010-05-27 17:58:56 +00:00
|
|
|
|
|
|
|
MODULE_AUTHOR("Steven King <sfking@fdwdc.com>");
|
|
|
|
MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver");
|
|
|
|
MODULE_LICENSE("GPL");
|