345 строки
10 KiB
C
345 строки
10 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
|
||
|
|
* - add emc1404 support
|
||
|
|
*/
|
||
|
|
|
||
|
|
#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>
|
||
|
|
|
||
|
|
#define THERMAL_PID_REG 0xfd
|
||
|
|
#define THERMAL_SMSC_ID_REG 0xfe
|
||
|
|
#define THERMAL_REVISION_REG 0xff
|
||
|
|
|
||
|
|
struct thermal_data {
|
||
|
|
struct device *hwmon_dev;
|
||
|
|
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 i2c_client *client = to_i2c_client(dev);
|
||
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
||
|
|
int retval = i2c_smbus_read_byte_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 i2c_client *client = to_i2c_client(dev);
|
||
|
|
struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
|
||
|
|
int retval = i2c_smbus_read_byte_data(client, sda->nr);
|
||
|
|
|
||
|
|
if (retval < 0)
|
||
|
|
return retval;
|
||
|
|
retval &= sda->index;
|
||
|
|
return sprintf(buf, "%d\n", retval ? 1 : 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
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 i2c_client *client = to_i2c_client(dev);
|
||
|
|
unsigned long val;
|
||
|
|
int retval;
|
||
|
|
|
||
|
|
if (strict_strtoul(buf, 10, &val))
|
||
|
|
return -EINVAL;
|
||
|
|
retval = i2c_smbus_write_byte_data(client, sda->index,
|
||
|
|
DIV_ROUND_CLOSEST(val, 1000));
|
||
|
|
if (retval < 0)
|
||
|
|
return retval;
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
static ssize_t show_hyst(struct device *dev,
|
||
|
|
struct device_attribute *attr, char *buf)
|
||
|
|
{
|
||
|
|
struct i2c_client *client = to_i2c_client(dev);
|
||
|
|
struct thermal_data *data = i2c_get_clientdata(client);
|
||
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
||
|
|
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 i2c_client *client = to_i2c_client(dev);
|
||
|
|
struct thermal_data *data = i2c_get_clientdata(client);
|
||
|
|
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
|
||
|
|
int retval;
|
||
|
|
int hyst;
|
||
|
|
unsigned long val;
|
||
|
|
|
||
|
|
if (strict_strtoul(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 struct attribute *mid_att_thermal[] = {
|
||
|
|
&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,
|
||
|
|
NULL
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct attribute_group m_thermal_gr = {
|
||
|
|
.attrs = mid_att_thermal
|
||
|
|
};
|
||
|
|
|
||
|
|
static int emc1403_detect(struct i2c_client *client,
|
||
|
|
struct i2c_board_info *info)
|
||
|
|
{
|
||
|
|
int id;
|
||
|
|
/* Check if thermal chip is SMSC and EMC1403 */
|
||
|
|
|
||
|
|
id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
|
||
|
|
if (id != 0x5d)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
/* Note: 0x25 is the 1404 which is very similar and this
|
||
|
|
driver could be extended */
|
||
|
|
id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
|
||
|
|
if (id != 0x21)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
|
||
|
|
if (id != 0x01)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int emc1403_probe(struct i2c_client *client,
|
||
|
|
const struct i2c_device_id *id)
|
||
|
|
{
|
||
|
|
int res;
|
||
|
|
struct thermal_data *data;
|
||
|
|
|
||
|
|
data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL);
|
||
|
|
if (data == NULL) {
|
||
|
|
dev_warn(&client->dev, "out of memory");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
i2c_set_clientdata(client, data);
|
||
|
|
mutex_init(&data->mutex);
|
||
|
|
data->hyst_valid = jiffies - 1; /* Expired */
|
||
|
|
|
||
|
|
res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
|
||
|
|
if (res) {
|
||
|
|
dev_warn(&client->dev, "create group failed\n");
|
||
|
|
hwmon_device_unregister(data->hwmon_dev);
|
||
|
|
goto thermal_error1;
|
||
|
|
}
|
||
|
|
data->hwmon_dev = hwmon_device_register(&client->dev);
|
||
|
|
if (IS_ERR(data->hwmon_dev)) {
|
||
|
|
res = PTR_ERR(data->hwmon_dev);
|
||
|
|
dev_warn(&client->dev, "register hwmon dev failed\n");
|
||
|
|
goto thermal_error2;
|
||
|
|
}
|
||
|
|
dev_info(&client->dev, "EMC1403 Thermal chip found\n");
|
||
|
|
return res;
|
||
|
|
|
||
|
|
thermal_error2:
|
||
|
|
sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
|
||
|
|
thermal_error1:
|
||
|
|
kfree(data);
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int emc1403_remove(struct i2c_client *client)
|
||
|
|
{
|
||
|
|
struct thermal_data *data = i2c_get_clientdata(client);
|
||
|
|
|
||
|
|
hwmon_device_unregister(data->hwmon_dev);
|
||
|
|
sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
|
||
|
|
kfree(data);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const unsigned short emc1403_address_list[] = {
|
||
|
|
0x18, 0x2a, 0x4c, 0x4d, I2C_CLIENT_END
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct i2c_device_id emc1403_idtable[] = {
|
||
|
|
{ "emc1403", 0 },
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
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,
|
||
|
|
.remove = emc1403_remove,
|
||
|
|
.id_table = emc1403_idtable,
|
||
|
|
.address_list = emc1403_address_list,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init sensor_emc1403_init(void)
|
||
|
|
{
|
||
|
|
return i2c_add_driver(&sensor_emc1403);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit sensor_emc1403_exit(void)
|
||
|
|
{
|
||
|
|
i2c_del_driver(&sensor_emc1403);
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(sensor_emc1403_init);
|
||
|
|
module_exit(sensor_emc1403_exit);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
|
||
|
|
MODULE_DESCRIPTION("emc1403 Thermal Driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|