502 lines
15 KiB
C
502 lines
15 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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#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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#include <linux/regmap.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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enum emc1403_chip { emc1402, emc1403, emc1404 };
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struct thermal_data {
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struct regmap *regmap;
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struct mutex mutex;
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const struct attribute_group *groups[4];
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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 sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct thermal_data *data = dev_get_drvdata(dev);
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unsigned int val;
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int retval;
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retval = regmap_read(data->regmap, sda->index, &val);
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if (retval < 0)
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return retval;
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return sprintf(buf, "%d000\n", val);
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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 sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
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struct thermal_data *data = dev_get_drvdata(dev);
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unsigned int val;
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int retval;
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retval = regmap_read(data->regmap, sda->nr, &val);
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if (retval < 0)
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return retval;
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return sprintf(buf, "%d\n", !!(val & sda->index));
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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 thermal_data *data = dev_get_drvdata(dev);
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unsigned long val;
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int retval;
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if (kstrtoul(buf, 10, &val))
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return -EINVAL;
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retval = regmap_write(data->regmap, 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 sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
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struct thermal_data *data = dev_get_drvdata(dev);
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unsigned long val;
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int retval;
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if (kstrtoul(buf, 10, &val))
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return -EINVAL;
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retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
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val ? sda->index : 0);
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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 show_hyst_common(struct device *dev,
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struct device_attribute *attr, char *buf,
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bool is_min)
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{
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struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct thermal_data *data = dev_get_drvdata(dev);
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struct regmap *regmap = data->regmap;
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unsigned int limit;
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unsigned int hyst;
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int retval;
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retval = regmap_read(regmap, sda->index, &limit);
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if (retval < 0)
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return retval;
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retval = regmap_read(regmap, 0x21, &hyst);
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if (retval < 0)
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return retval;
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return sprintf(buf, "%d000\n", is_min ? limit + hyst : limit - hyst);
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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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return show_hyst_common(dev, attr, buf, false);
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}
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static ssize_t show_min_hyst(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return show_hyst_common(dev, attr, buf, true);
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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 sensor_device_attribute *sda = to_sensor_dev_attr(attr);
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struct thermal_data *data = dev_get_drvdata(dev);
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struct regmap *regmap = data->regmap;
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unsigned int limit;
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int retval;
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int hyst;
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unsigned long val;
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if (kstrtoul(buf, 10, &val))
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return -EINVAL;
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mutex_lock(&data->mutex);
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retval = regmap_read(regmap, sda->index, &limit);
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if (retval < 0)
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goto fail;
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hyst = limit * 1000 - val;
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hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
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retval = regmap_write(regmap, 0x21, hyst);
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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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/*
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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_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x06);
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static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_hyst, NULL, 0x05);
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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_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x02);
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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_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x08);
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static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO, show_hyst, NULL, 0x07);
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static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_hyst, NULL, 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_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x04);
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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_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x16);
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static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IRUGO, show_hyst, NULL, 0x15);
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static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_hyst, NULL, 0x1A);
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static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x2D);
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static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x2C);
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static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO | S_IWUSR,
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show_temp, store_temp, 0x30);
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static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 0x2A);
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static SENSOR_DEVICE_ATTR_2(temp4_fault, S_IRUGO, show_bit, NULL, 0x1b, 0x08);
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static SENSOR_DEVICE_ATTR_2(temp4_min_alarm, S_IRUGO,
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show_bit, NULL, 0x36, 0x08);
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static SENSOR_DEVICE_ATTR_2(temp4_max_alarm, S_IRUGO,
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show_bit, NULL, 0x35, 0x08);
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static SENSOR_DEVICE_ATTR_2(temp4_crit_alarm, S_IRUGO,
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show_bit, NULL, 0x37, 0x08);
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static SENSOR_DEVICE_ATTR(temp4_min_hyst, S_IRUGO, show_min_hyst, NULL, 0x2D);
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static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IRUGO, show_hyst, NULL, 0x2C);
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static SENSOR_DEVICE_ATTR(temp4_crit_hyst, S_IRUGO, show_hyst, NULL, 0x30);
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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 *emc1402_attrs[] = {
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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_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.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_hyst.dev_attr.attr,
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&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp2_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 emc1402_group = {
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.attrs = emc1402_attrs,
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};
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static struct attribute *emc1403_attrs[] = {
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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_temp2_fault.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_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_fault.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_min_hyst.dev_attr.attr,
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&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
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NULL
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};
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static const struct attribute_group emc1403_group = {
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.attrs = emc1403_attrs,
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};
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static struct attribute *emc1404_attrs[] = {
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&sensor_dev_attr_temp4_min.dev_attr.attr,
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&sensor_dev_attr_temp4_max.dev_attr.attr,
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&sensor_dev_attr_temp4_crit.dev_attr.attr,
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&sensor_dev_attr_temp4_input.dev_attr.attr,
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&sensor_dev_attr_temp4_fault.dev_attr.attr,
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&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_min_hyst.dev_attr.attr,
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&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp4_crit_hyst.dev_attr.attr,
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NULL
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};
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static const struct attribute_group emc1404_group = {
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.attrs = emc1404_attrs,
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};
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/*
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* EMC14x2 uses a different register and different bits to report alarm and
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* fault status. For simplicity, provide a separate attribute group for this
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* chip series.
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* Since we can not re-use the same attribute names, create a separate attribute
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* array.
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*/
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static struct sensor_device_attribute_2 emc1402_alarms[] = {
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SENSOR_ATTR_2(temp1_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x20),
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SENSOR_ATTR_2(temp1_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x40),
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SENSOR_ATTR_2(temp1_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x01),
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SENSOR_ATTR_2(temp2_fault, S_IRUGO, show_bit, NULL, 0x02, 0x04),
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SENSOR_ATTR_2(temp2_min_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x08),
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SENSOR_ATTR_2(temp2_max_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x10),
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SENSOR_ATTR_2(temp2_crit_alarm, S_IRUGO, show_bit, NULL, 0x02, 0x02),
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};
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static struct attribute *emc1402_alarm_attrs[] = {
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&emc1402_alarms[0].dev_attr.attr,
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&emc1402_alarms[1].dev_attr.attr,
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&emc1402_alarms[2].dev_attr.attr,
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&emc1402_alarms[3].dev_attr.attr,
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&emc1402_alarms[4].dev_attr.attr,
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&emc1402_alarms[5].dev_attr.attr,
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&emc1402_alarms[6].dev_attr.attr,
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NULL,
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};
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static const struct attribute_group emc1402_alarm_group = {
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.attrs = emc1402_alarm_attrs,
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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 0x20:
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strlcpy(info->type, "emc1402", I2C_NAME_SIZE);
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break;
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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 0x22:
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strlcpy(info->type, "emc1422", 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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case 0x25:
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strlcpy(info->type, "emc1404", I2C_NAME_SIZE);
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break;
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case 0x27:
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strlcpy(info->type, "emc1424", I2C_NAME_SIZE);
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break;
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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 || id > 0x04)
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return -ENODEV;
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return 0;
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}
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static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case 0x00: /* internal diode high byte */
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case 0x01: /* external diode 1 high byte */
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case 0x02: /* status */
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case 0x10: /* external diode 1 low byte */
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case 0x1b: /* external diode fault */
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case 0x23: /* external diode 2 high byte */
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case 0x24: /* external diode 2 low byte */
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case 0x29: /* internal diode low byte */
|
|
case 0x2a: /* externl diode 3 high byte */
|
|
case 0x2b: /* external diode 3 low byte */
|
|
case 0x35: /* high limit status */
|
|
case 0x36: /* low limit status */
|
|
case 0x37: /* therm limit status */
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static const struct regmap_config emc1403_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
.volatile_reg = emc1403_regmap_is_volatile,
|
|
};
|
|
|
|
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->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
|
|
if (IS_ERR(data->regmap))
|
|
return PTR_ERR(data->regmap);
|
|
|
|
mutex_init(&data->mutex);
|
|
|
|
switch (id->driver_data) {
|
|
case emc1404:
|
|
data->groups[2] = &emc1404_group;
|
|
/* fall through */
|
|
case emc1403:
|
|
data->groups[1] = &emc1403_group;
|
|
/* fall through */
|
|
case emc1402:
|
|
data->groups[0] = &emc1402_group;
|
|
}
|
|
|
|
if (id->driver_data == emc1402)
|
|
data->groups[1] = &emc1402_alarm_group;
|
|
|
|
hwmon_dev = devm_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, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
|
|
};
|
|
|
|
/* Last digit of chip name indicates number of channels */
|
|
static const struct i2c_device_id emc1403_idtable[] = {
|
|
{ "emc1402", emc1402 },
|
|
{ "emc1403", emc1403 },
|
|
{ "emc1404", emc1404 },
|
|
{ "emc1412", emc1402 },
|
|
{ "emc1413", emc1403 },
|
|
{ "emc1414", emc1404 },
|
|
{ "emc1422", emc1402 },
|
|
{ "emc1423", emc1403 },
|
|
{ "emc1424", emc1404 },
|
|
{ }
|
|
};
|
|
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");
|