385 lines
11 KiB
C
385 lines
11 KiB
C
/*
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* emc1403.c - SMSC Thermal Driver
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*
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* Copyright (C) 2008 Intel Corp
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* TODO
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* - cache alarm and critical limit registers
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* - add emc1404 support
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/sysfs.h>
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#include <linux/mutex.h>
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#define THERMAL_PID_REG 0xfd
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#define THERMAL_SMSC_ID_REG 0xfe
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#define THERMAL_REVISION_REG 0xff
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struct thermal_data {
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struct device *hwmon_dev;
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struct mutex mutex;
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/* Cache the hyst value so we don't keep re-reading it. In theory
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we could cache it forever as nobody else should be writing it. */
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u8 cached_hyst;
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unsigned long hyst_valid;
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};
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static ssize_t show_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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int retval = i2c_smbus_read_byte_data(client, sda->index);
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if (retval < 0)
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return retval;
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return sprintf(buf, "%d000\n", retval);
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}
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static ssize_t show_bit(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
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int retval = i2c_smbus_read_byte_data(client, sda->nr);
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if (retval < 0)
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return retval;
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retval &= sda->index;
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return sprintf(buf, "%d\n", retval ? 1 : 0);
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}
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static ssize_t store_temp(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct i2c_client *client = to_i2c_client(dev);
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unsigned long val;
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int retval;
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if (strict_strtoul(buf, 10, &val))
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return -EINVAL;
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retval = i2c_smbus_write_byte_data(client, sda->index,
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DIV_ROUND_CLOSEST(val, 1000));
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if (retval < 0)
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return retval;
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return count;
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}
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static ssize_t store_bit(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct thermal_data *data = i2c_get_clientdata(client);
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struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
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unsigned long val;
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int retval;
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if (strict_strtoul(buf, 10, &val))
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return -EINVAL;
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mutex_lock(&data->mutex);
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retval = i2c_smbus_read_byte_data(client, sda->nr);
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if (retval < 0)
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goto fail;
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retval &= ~sda->index;
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if (val)
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retval |= sda->index;
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retval = i2c_smbus_write_byte_data(client, sda->index, retval);
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if (retval == 0)
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retval = count;
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fail:
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mutex_unlock(&data->mutex);
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return retval;
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}
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static ssize_t show_hyst(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct thermal_data *data = i2c_get_clientdata(client);
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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int retval;
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int hyst;
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retval = i2c_smbus_read_byte_data(client, sda->index);
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if (retval < 0)
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return retval;
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if (time_after(jiffies, data->hyst_valid)) {
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hyst = i2c_smbus_read_byte_data(client, 0x21);
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if (hyst < 0)
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return retval;
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data->cached_hyst = hyst;
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data->hyst_valid = jiffies + HZ;
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}
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return sprintf(buf, "%d000\n", retval - data->cached_hyst);
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}
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static ssize_t store_hyst(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct thermal_data *data = i2c_get_clientdata(client);
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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int retval;
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int hyst;
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unsigned long val;
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if (strict_strtoul(buf, 10, &val))
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return -EINVAL;
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mutex_lock(&data->mutex);
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retval = i2c_smbus_read_byte_data(client, sda->index);
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if (retval < 0)
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goto fail;
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hyst = val - retval * 1000;
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hyst = DIV_ROUND_CLOSEST(hyst, 1000);
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if (hyst < 0 || hyst > 255) {
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retval = -ERANGE;
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goto fail;
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}
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retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
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if (retval == 0) {
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retval = count;
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data->cached_hyst = hyst;
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data->hyst_valid = jiffies + HZ;
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}
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fail:
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mutex_unlock(&data->mutex);
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return retval;
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}
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/*
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* Sensors. We pass the actual i2c register to the methods.
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*/
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static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x06);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x05);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x20);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0x00);
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static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO,
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show_bit, NULL, 0x36, 0x01);
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static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO,
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show_bit, NULL, 0x35, 0x01);
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static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO,
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show_bit, NULL, 0x37, 0x01);
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static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO | S_IWUSR,
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show_hyst, store_hyst, 0x20);
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static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x08);
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static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x07);
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static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x19);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 0x01);
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static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO,
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show_bit, NULL, 0x36, 0x02);
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static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO,
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show_bit, NULL, 0x35, 0x02);
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static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO,
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show_bit, NULL, 0x37, 0x02);
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static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO | S_IWUSR,
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show_hyst, store_hyst, 0x19);
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static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x16);
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static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x15);
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static SENSOR_DEVICE_ATTR(temp3_crit, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x1A);
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static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 0x23);
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static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO,
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show_bit, NULL, 0x36, 0x04);
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static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO,
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show_bit, NULL, 0x35, 0x04);
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static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO,
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show_bit, NULL, 0x37, 0x04);
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static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO | S_IWUSR,
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show_hyst, store_hyst, 0x1A);
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static SENSOR_DEVICE_ATTR_2(power_state, S_IRUGO | S_IWUSR,
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show_bit, store_bit, 0x03, 0x40);
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static struct attribute *mid_att_thermal[] = {
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp2_crit.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
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&sensor_dev_attr_temp3_min.dev_attr.attr,
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&sensor_dev_attr_temp3_max.dev_attr.attr,
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&sensor_dev_attr_temp3_crit.dev_attr.attr,
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&sensor_dev_attr_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
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&sensor_dev_attr_power_state.dev_attr.attr,
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NULL
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};
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static const struct attribute_group m_thermal_gr = {
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.attrs = mid_att_thermal
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};
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static int emc1403_detect(struct i2c_client *client,
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struct i2c_board_info *info)
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{
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int id;
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/* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
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id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
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if (id != 0x5d)
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return -ENODEV;
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id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
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switch (id) {
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case 0x21:
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strlcpy(info->type, "emc1403", I2C_NAME_SIZE);
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break;
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case 0x23:
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strlcpy(info->type, "emc1423", I2C_NAME_SIZE);
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break;
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/* Note: 0x25 is the 1404 which is very similar and this
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driver could be extended */
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default:
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return -ENODEV;
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}
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id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
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if (id != 0x01)
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return -ENODEV;
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return 0;
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}
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static int emc1403_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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int res;
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struct thermal_data *data;
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data = kzalloc(sizeof(struct thermal_data), GFP_KERNEL);
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if (data == NULL) {
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dev_warn(&client->dev, "out of memory");
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return -ENOMEM;
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}
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i2c_set_clientdata(client, data);
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mutex_init(&data->mutex);
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data->hyst_valid = jiffies - 1; /* Expired */
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res = sysfs_create_group(&client->dev.kobj, &m_thermal_gr);
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if (res) {
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dev_warn(&client->dev, "create group failed\n");
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goto thermal_error1;
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}
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data->hwmon_dev = hwmon_device_register(&client->dev);
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if (IS_ERR(data->hwmon_dev)) {
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res = PTR_ERR(data->hwmon_dev);
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dev_warn(&client->dev, "register hwmon dev failed\n");
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goto thermal_error2;
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}
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dev_info(&client->dev, "EMC1403 Thermal chip found\n");
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return res;
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thermal_error2:
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sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
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thermal_error1:
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kfree(data);
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return res;
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}
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static int emc1403_remove(struct i2c_client *client)
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{
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struct thermal_data *data = i2c_get_clientdata(client);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &m_thermal_gr);
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kfree(data);
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return 0;
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}
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static const unsigned short emc1403_address_list[] = {
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0x18, 0x2a, 0x4c, 0x4d, I2C_CLIENT_END
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};
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static const struct i2c_device_id emc1403_idtable[] = {
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{ "emc1403", 0 },
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{ "emc1423", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
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static struct i2c_driver sensor_emc1403 = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "emc1403",
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},
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.detect = emc1403_detect,
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.probe = emc1403_probe,
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.remove = emc1403_remove,
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.id_table = emc1403_idtable,
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.address_list = emc1403_address_list,
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};
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static int __init sensor_emc1403_init(void)
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{
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return i2c_add_driver(&sensor_emc1403);
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}
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static void __exit sensor_emc1403_exit(void)
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{
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i2c_del_driver(&sensor_emc1403);
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}
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module_init(sensor_emc1403_init);
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module_exit(sensor_emc1403_exit);
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MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
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MODULE_DESCRIPTION("emc1403 Thermal Driver");
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MODULE_LICENSE("GPL v2");
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