397 lines
12 KiB
C
397 lines
12 KiB
C
/*
|
|
* emc1403.c - SMSC Thermal Driver
|
|
*
|
|
* Copyright (C) 2008 Intel Corp
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* 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; version 2 of the License.
|
|
*
|
|
* 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.,
|
|
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* TODO
|
|
* - cache alarm and critical limit registers
|
|
*/
|
|
|
|
#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/sysfs.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/jiffies.h>
|
|
|
|
#define THERMAL_PID_REG 0xfd
|
|
#define THERMAL_SMSC_ID_REG 0xfe
|
|
#define THERMAL_REVISION_REG 0xff
|
|
|
|
struct thermal_data {
|
|
struct i2c_client *client;
|
|
const struct attribute_group *groups[3];
|
|
struct mutex mutex;
|
|
/*
|
|
* Cache the hyst value so we don't keep re-reading it. In theory
|
|
* we could cache it forever as nobody else should be writing it.
|
|
*/
|
|
u8 cached_hyst;
|
|
unsigned long hyst_valid;
|
|
};
|
|
|
|
static ssize_t show_temp(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
|
struct thermal_data *data = dev_get_drvdata(dev);
|
|
int retval;
|
|
|
|
retval = i2c_smbus_read_byte_data(data->client, sda->index);
|
|
if (retval < 0)
|
|
return retval;
|
|
return sprintf(buf, "%d000\n", retval);
|
|
}
|
|
|
|
static ssize_t show_bit(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
|
|
struct thermal_data *data = dev_get_drvdata(dev);
|
|
int retval;
|
|
|
|
retval = i2c_smbus_read_byte_data(data->client, sda->nr);
|
|
if (retval < 0)
|
|
return retval;
|
|
return sprintf(buf, "%d\n", !!(retval & sda->index));
|
|
}
|
|
|
|
static ssize_t store_temp(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
|
struct thermal_data *data = dev_get_drvdata(dev);
|
|
unsigned long val;
|
|
int retval;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
retval = i2c_smbus_write_byte_data(data->client, sda->index,
|
|
DIV_ROUND_CLOSEST(val, 1000));
|
|
if (retval < 0)
|
|
return retval;
|
|
return count;
|
|
}
|
|
|
|
static ssize_t store_bit(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
|
|
struct thermal_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
unsigned long val;
|
|
int retval;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&data->mutex);
|
|
retval = i2c_smbus_read_byte_data(client, sda->nr);
|
|
if (retval < 0)
|
|
goto fail;
|
|
|
|
retval &= ~sda->index;
|
|
if (val)
|
|
retval |= sda->index;
|
|
|
|
retval = i2c_smbus_write_byte_data(client, sda->index, retval);
|
|
if (retval == 0)
|
|
retval = count;
|
|
fail:
|
|
mutex_unlock(&data->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t show_hyst(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
|
struct thermal_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
int retval;
|
|
int hyst;
|
|
|
|
retval = i2c_smbus_read_byte_data(client, sda->index);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
if (time_after(jiffies, data->hyst_valid)) {
|
|
hyst = i2c_smbus_read_byte_data(client, 0x21);
|
|
if (hyst < 0)
|
|
return retval;
|
|
data->cached_hyst = hyst;
|
|
data->hyst_valid = jiffies + HZ;
|
|
}
|
|
return sprintf(buf, "%d000\n", retval - data->cached_hyst);
|
|
}
|
|
|
|
static ssize_t store_hyst(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
|
struct thermal_data *data = dev_get_drvdata(dev);
|
|
struct i2c_client *client = data->client;
|
|
int retval;
|
|
int hyst;
|
|
unsigned long val;
|
|
|
|
if (kstrtoul(buf, 10, &val))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&data->mutex);
|
|
retval = i2c_smbus_read_byte_data(client, sda->index);
|
|
if (retval < 0)
|
|
goto fail;
|
|
|
|
hyst = val - retval * 1000;
|
|
hyst = DIV_ROUND_CLOSEST(hyst, 1000);
|
|
if (hyst < 0 || hyst > 255) {
|
|
retval = -ERANGE;
|
|
goto fail;
|
|
}
|
|
|
|
retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
|
|
if (retval == 0) {
|
|
retval = count;
|
|
data->cached_hyst = hyst;
|
|
data->hyst_valid = jiffies + HZ;
|
|
}
|
|
fail:
|
|
mutex_unlock(&data->mutex);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Sensors. We pass the actual i2c register to the methods.
|
|
*/
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x06);
|
|
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x05);
|
|
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x20);
|
|
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
|
|
static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x36, 0x01);
|
|
static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x35, 0x01);
|
|
static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x37, 0x01);
|
|
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
|
|
show_hyst, store_hyst, 0x20);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x08);
|
|
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x07);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x19);
|
|
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
|
|
static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x36, 0x02);
|
|
static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x35, 0x02);
|
|
static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x37, 0x02);
|
|
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
|
|
show_hyst, store_hyst, 0x19);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x16);
|
|
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x15);
|
|
static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x1A);
|
|
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
|
|
static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x36, 0x04);
|
|
static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x35, 0x04);
|
|
static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x37, 0x04);
|
|
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
|
|
show_hyst, store_hyst, 0x1A);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x2D);
|
|
static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x2C);
|
|
static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO | S_IWUSR,
|
|
show_temp, store_temp, 0x30);
|
|
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 0x2A);
|
|
static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x36, 0x08);
|
|
static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x35, 0x08);
|
|
static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO,
|
|
show_bit, NULL, 0x37, 0x08);
|
|
static SENSOR_DEVICE_ATTR(temp4_crit_hyst, S_IRUGO | S_IWUSR,
|
|
show_hyst, store_hyst, 0x30);
|
|
|
|
static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
|
|
show_bit, store_bit, 0x03, 0x40);
|
|
|
|
static struct attribute *emc1403_attrs[] = {
|
|
&sensor_dev_attr_temp1_min.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_min.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_min.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
|
|
&sensor_dev_attr_power_state.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group emc1403_group = {
|
|
.attrs = emc1403_attrs,
|
|
};
|
|
|
|
static struct attribute *emc1404_attrs[] = {
|
|
&sensor_dev_attr_temp4_min.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_max.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_crit.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_input.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group emc1404_group = {
|
|
.attrs = emc1404_attrs,
|
|
};
|
|
|
|
static int emc1403_detect(struct i2c_client *client,
|
|
struct i2c_board_info *info)
|
|
{
|
|
int id;
|
|
/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
|
|
|
|
id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
|
|
if (id != 0x5d)
|
|
return -ENODEV;
|
|
|
|
id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
|
|
switch (id) {
|
|
case 0x21:
|
|
strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
|
|
break;
|
|
case 0x23:
|
|
strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
|
|
break;
|
|
case 0x25:
|
|
strlcpy(info->type, "emc1404", I2C_NAME_SIZE);
|
|
break;
|
|
case 0x27:
|
|
strlcpy(info->type, "emc1424", I2C_NAME_SIZE);
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
|
|
if (id != 0x01)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int emc1403_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct thermal_data *data;
|
|
struct device *hwmon_dev;
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
|
|
GFP_KERNEL);
|
|
if (data == NULL)
|
|
return -ENOMEM;
|
|
|
|
data->client = client;
|
|
mutex_init(&data->mutex);
|
|
data->hyst_valid = jiffies - 1; /* Expired */
|
|
|
|
data->groups[0] = &emc1403_group;
|
|
if (id->driver_data)
|
|
data->groups[1] = &emc1404_group;
|
|
|
|
hwmon_dev = hwmon_device_register_with_groups(&client->dev,
|
|
client->name, data,
|
|
data->groups);
|
|
if (IS_ERR(hwmon_dev))
|
|
return PTR_ERR(hwmon_dev);
|
|
|
|
dev_info(&client->dev, "%s Thermal chip found\n", id->name);
|
|
return 0;
|
|
}
|
|
|
|
static const unsigned short emc1403_address_list[] = {
|
|
0x18, 0x29, 0x4c, 0x4d, I2C_CLIENT_END
|
|
};
|
|
|
|
static const struct i2c_device_id emc1403_idtable[] = {
|
|
{ "emc1403", 0 },
|
|
{ "emc1404", 1 },
|
|
{ "emc1423", 0 },
|
|
{ "emc1424", 1 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
|
|
|
|
static struct i2c_driver sensor_emc1403 = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "emc1403",
|
|
},
|
|
.detect = emc1403_detect,
|
|
.probe = emc1403_probe,
|
|
.id_table = emc1403_idtable,
|
|
.address_list = emc1403_address_list,
|
|
};
|
|
|
|
module_i2c_driver(sensor_emc1403);
|
|
|
|
MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
|
|
MODULE_DESCRIPTION("emc1403 Thermal Driver");
|
|
MODULE_LICENSE("GPL v2");
|