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466 lines
14 KiB
466 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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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 temp_show(struct device *dev, struct device_attribute *attr, |
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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 bit_show(struct device *dev, struct device_attribute *attr, |
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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 temp_store(struct device *dev, struct device_attribute *attr, |
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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 bit_store(struct device *dev, struct device_attribute *attr, |
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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 hyst_show(struct device *dev, struct device_attribute *attr, |
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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 min_hyst_show(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 hyst_store(struct device *dev, struct device_attribute *attr, |
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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_RW(temp1_min, temp, 0x06); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 0x05); |
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static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, 0x20); |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0x00); |
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static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, bit, 0x36, 0x01); |
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static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, bit, 0x35, 0x01); |
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static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, bit, 0x37, 0x01); |
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static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, min_hyst, 0x06); |
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static SENSOR_DEVICE_ATTR_RO(temp1_max_hyst, hyst, 0x05); |
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static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0x20); |
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static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, 0x08); |
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static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, 0x07); |
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static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, 0x19); |
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static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 0x01); |
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static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, bit, 0x1b, 0x02); |
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static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, bit, 0x36, 0x02); |
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static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, bit, 0x35, 0x02); |
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static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, bit, 0x37, 0x02); |
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static SENSOR_DEVICE_ATTR_RO(temp2_min_hyst, min_hyst, 0x08); |
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static SENSOR_DEVICE_ATTR_RO(temp2_max_hyst, hyst, 0x07); |
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static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, hyst, 0x19); |
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static SENSOR_DEVICE_ATTR_RW(temp3_min, temp, 0x16); |
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static SENSOR_DEVICE_ATTR_RW(temp3_max, temp, 0x15); |
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static SENSOR_DEVICE_ATTR_RW(temp3_crit, temp, 0x1A); |
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static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 0x23); |
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static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, bit, 0x1b, 0x04); |
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static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, bit, 0x36, 0x04); |
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static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, bit, 0x35, 0x04); |
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static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, bit, 0x37, 0x04); |
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static SENSOR_DEVICE_ATTR_RO(temp3_min_hyst, min_hyst, 0x16); |
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static SENSOR_DEVICE_ATTR_RO(temp3_max_hyst, hyst, 0x15); |
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static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, hyst, 0x1A); |
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static SENSOR_DEVICE_ATTR_RW(temp4_min, temp, 0x2D); |
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static SENSOR_DEVICE_ATTR_RW(temp4_max, temp, 0x2C); |
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static SENSOR_DEVICE_ATTR_RW(temp4_crit, temp, 0x30); |
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static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 0x2A); |
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static SENSOR_DEVICE_ATTR_2_RO(temp4_fault, bit, 0x1b, 0x08); |
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static SENSOR_DEVICE_ATTR_2_RO(temp4_min_alarm, bit, 0x36, 0x08); |
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static SENSOR_DEVICE_ATTR_2_RO(temp4_max_alarm, bit, 0x35, 0x08); |
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static SENSOR_DEVICE_ATTR_2_RO(temp4_crit_alarm, bit, 0x37, 0x08); |
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static SENSOR_DEVICE_ATTR_RO(temp4_min_hyst, min_hyst, 0x2D); |
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static SENSOR_DEVICE_ATTR_RO(temp4_max_hyst, hyst, 0x2C); |
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static SENSOR_DEVICE_ATTR_RO(temp4_crit_hyst, hyst, 0x30); |
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static SENSOR_DEVICE_ATTR_2_RW(power_state, 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_RO(temp1_min_alarm, bit, 0x02, 0x20), |
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SENSOR_ATTR_2_RO(temp1_max_alarm, bit, 0x02, 0x40), |
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SENSOR_ATTR_2_RO(temp1_crit_alarm, bit, 0x02, 0x01), |
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SENSOR_ATTR_2_RO(temp2_fault, bit, 0x02, 0x04), |
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SENSOR_ATTR_2_RO(temp2_min_alarm, bit, 0x02, 0x08), |
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SENSOR_ATTR_2_RO(temp2_max_alarm, bit, 0x02, 0x10), |
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SENSOR_ATTR_2_RO(temp2_crit_alarm, bit, 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 */ |
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case 0x2a: /* externl diode 3 high byte */ |
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case 0x2b: /* external diode 3 low byte */ |
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case 0x35: /* high limit status */ |
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case 0x36: /* low limit status */ |
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case 0x37: /* therm limit status */ |
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return true; |
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default: |
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return false; |
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} |
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} |
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static const struct regmap_config emc1403_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.cache_type = REGCACHE_RBTREE, |
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.volatile_reg = emc1403_regmap_is_volatile, |
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}; |
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static const struct i2c_device_id emc1403_idtable[]; |
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static int emc1403_probe(struct i2c_client *client) |
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{ |
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struct thermal_data *data; |
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struct device *hwmon_dev; |
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const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client); |
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data = devm_kzalloc(&client->dev, sizeof(struct thermal_data), |
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GFP_KERNEL); |
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if (data == NULL) |
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return -ENOMEM; |
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data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config); |
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if (IS_ERR(data->regmap)) |
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return PTR_ERR(data->regmap); |
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mutex_init(&data->mutex); |
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switch (id->driver_data) { |
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case emc1404: |
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data->groups[2] = &emc1404_group; |
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fallthrough; |
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case emc1403: |
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data->groups[1] = &emc1403_group; |
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fallthrough; |
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case emc1402: |
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data->groups[0] = &emc1402_group; |
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} |
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if (id->driver_data == emc1402) |
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data->groups[1] = &emc1402_alarm_group; |
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hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev, |
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client->name, data, |
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data->groups); |
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if (IS_ERR(hwmon_dev)) |
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return PTR_ERR(hwmon_dev); |
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dev_info(&client->dev, "%s Thermal chip found\n", id->name); |
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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, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END |
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}; |
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/* Last digit of chip name indicates number of channels */ |
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static const struct i2c_device_id emc1403_idtable[] = { |
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{ "emc1402", emc1402 }, |
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{ "emc1403", emc1403 }, |
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{ "emc1404", emc1404 }, |
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{ "emc1412", emc1402 }, |
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{ "emc1413", emc1403 }, |
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{ "emc1414", emc1404 }, |
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{ "emc1422", emc1402 }, |
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{ "emc1423", emc1403 }, |
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{ "emc1424", emc1404 }, |
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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_new = emc1403_probe, |
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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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module_i2c_driver(sensor_emc1403); |
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MODULE_AUTHOR("Kalhan Trisal <[email protected]"); |
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MODULE_DESCRIPTION("emc1403 Thermal Driver"); |
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MODULE_LICENSE("GPL v2");
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