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linux-next/drivers/hwmon/emc1403.c
Guenter Roeck 0011ddfe6a hwmon: (emc1403) Add support for EMC1404 and EMC1424 
EMC1404 and EMC1424 are similar to EMC1403 and EMC1423,
but support an additional external temperature sensor.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2013-10-18 09:12:04 -07:00

397 lines
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/*
* 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");
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