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488 lines
12 KiB
488 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware |
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* monitoring |
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* This driver handles the ADT7410 and compatible digital temperature sensors. |
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* Hartmut Knaack <[email protected]> 2012-07-22 |
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* based on lm75.c by Frodo Looijaard <[email protected]> |
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* and adt7410.c from iio-staging by Sonic Zhang <[email protected]> |
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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/jiffies.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/mutex.h> |
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#include <linux/delay.h> |
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#include <linux/interrupt.h> |
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#include "adt7x10.h" |
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/* |
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* ADT7X10 status |
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*/ |
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#define ADT7X10_STAT_T_LOW (1 << 4) |
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#define ADT7X10_STAT_T_HIGH (1 << 5) |
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#define ADT7X10_STAT_T_CRIT (1 << 6) |
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#define ADT7X10_STAT_NOT_RDY (1 << 7) |
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|
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/* |
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* ADT7X10 config |
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*/ |
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#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 | 1 << 1) |
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#define ADT7X10_CT_POLARITY (1 << 2) |
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#define ADT7X10_INT_POLARITY (1 << 3) |
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#define ADT7X10_EVENT_MODE (1 << 4) |
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#define ADT7X10_MODE_MASK (1 << 5 | 1 << 6) |
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#define ADT7X10_FULL (0 << 5 | 0 << 6) |
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#define ADT7X10_PD (1 << 5 | 1 << 6) |
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#define ADT7X10_RESOLUTION (1 << 7) |
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/* |
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* ADT7X10 masks |
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*/ |
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#define ADT7X10_T13_VALUE_MASK 0xFFF8 |
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#define ADT7X10_T_HYST_MASK 0xF |
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/* straight from the datasheet */ |
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#define ADT7X10_TEMP_MIN (-55000) |
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#define ADT7X10_TEMP_MAX 150000 |
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/* Each client has this additional data */ |
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struct adt7x10_data { |
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const struct adt7x10_ops *ops; |
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const char *name; |
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struct device *hwmon_dev; |
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struct mutex update_lock; |
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u8 config; |
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u8 oldconfig; |
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bool valid; /* true if registers valid */ |
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unsigned long last_updated; /* In jiffies */ |
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s16 temp[4]; /* Register values, |
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0 = input |
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1 = high |
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2 = low |
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3 = critical */ |
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u8 hyst; /* hysteresis offset */ |
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}; |
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static int adt7x10_read_byte(struct device *dev, u8 reg) |
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{ |
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struct adt7x10_data *d = dev_get_drvdata(dev); |
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return d->ops->read_byte(dev, reg); |
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} |
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static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data) |
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{ |
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struct adt7x10_data *d = dev_get_drvdata(dev); |
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return d->ops->write_byte(dev, reg, data); |
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} |
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static int adt7x10_read_word(struct device *dev, u8 reg) |
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{ |
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struct adt7x10_data *d = dev_get_drvdata(dev); |
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return d->ops->read_word(dev, reg); |
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} |
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static int adt7x10_write_word(struct device *dev, u8 reg, u16 data) |
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{ |
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struct adt7x10_data *d = dev_get_drvdata(dev); |
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return d->ops->write_word(dev, reg, data); |
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} |
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static const u8 ADT7X10_REG_TEMP[4] = { |
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ADT7X10_TEMPERATURE, /* input */ |
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ADT7X10_T_ALARM_HIGH, /* high */ |
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ADT7X10_T_ALARM_LOW, /* low */ |
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ADT7X10_T_CRIT, /* critical */ |
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}; |
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static irqreturn_t adt7x10_irq_handler(int irq, void *private) |
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{ |
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struct device *dev = private; |
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int status; |
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status = adt7x10_read_byte(dev, ADT7X10_STATUS); |
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if (status < 0) |
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return IRQ_HANDLED; |
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if (status & ADT7X10_STAT_T_HIGH) |
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sysfs_notify(&dev->kobj, NULL, "temp1_max_alarm"); |
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if (status & ADT7X10_STAT_T_LOW) |
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sysfs_notify(&dev->kobj, NULL, "temp1_min_alarm"); |
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if (status & ADT7X10_STAT_T_CRIT) |
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sysfs_notify(&dev->kobj, NULL, "temp1_crit_alarm"); |
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return IRQ_HANDLED; |
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} |
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static int adt7x10_temp_ready(struct device *dev) |
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{ |
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int i, status; |
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for (i = 0; i < 6; i++) { |
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status = adt7x10_read_byte(dev, ADT7X10_STATUS); |
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if (status < 0) |
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return status; |
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if (!(status & ADT7X10_STAT_NOT_RDY)) |
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return 0; |
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msleep(60); |
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} |
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return -ETIMEDOUT; |
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} |
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static int adt7x10_update_temp(struct device *dev) |
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{ |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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int ret = 0; |
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mutex_lock(&data->update_lock); |
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
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|| !data->valid) { |
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int temp; |
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dev_dbg(dev, "Starting update\n"); |
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ret = adt7x10_temp_ready(dev); /* check for new value */ |
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if (ret) |
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goto abort; |
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temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]); |
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if (temp < 0) { |
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ret = temp; |
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dev_dbg(dev, "Failed to read value: reg %d, error %d\n", |
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ADT7X10_REG_TEMP[0], ret); |
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goto abort; |
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} |
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data->temp[0] = temp; |
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data->last_updated = jiffies; |
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data->valid = true; |
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} |
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abort: |
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mutex_unlock(&data->update_lock); |
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return ret; |
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} |
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static int adt7x10_fill_cache(struct device *dev) |
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{ |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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int ret; |
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int i; |
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for (i = 1; i < ARRAY_SIZE(data->temp); i++) { |
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ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]); |
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if (ret < 0) { |
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dev_dbg(dev, "Failed to read value: reg %d, error %d\n", |
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ADT7X10_REG_TEMP[i], ret); |
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return ret; |
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} |
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data->temp[i] = ret; |
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} |
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ret = adt7x10_read_byte(dev, ADT7X10_T_HYST); |
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if (ret < 0) { |
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dev_dbg(dev, "Failed to read value: reg %d, error %d\n", |
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ADT7X10_T_HYST, ret); |
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return ret; |
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} |
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data->hyst = ret; |
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return 0; |
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} |
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static s16 ADT7X10_TEMP_TO_REG(long temp) |
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{ |
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return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN, |
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ADT7X10_TEMP_MAX) * 128, 1000); |
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} |
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static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg) |
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{ |
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/* in 13 bit mode, bits 0-2 are status flags - mask them out */ |
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if (!(data->config & ADT7X10_RESOLUTION)) |
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reg &= ADT7X10_T13_VALUE_MASK; |
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/* |
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* temperature is stored in twos complement format, in steps of |
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* 1/128°C |
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*/ |
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return DIV_ROUND_CLOSEST(reg * 1000, 128); |
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} |
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/*-----------------------------------------------------------------------*/ |
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/* sysfs attributes for hwmon */ |
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static ssize_t adt7x10_temp_show(struct device *dev, |
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struct device_attribute *da, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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if (attr->index == 0) { |
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int ret; |
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ret = adt7x10_update_temp(dev); |
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if (ret) |
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return ret; |
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} |
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return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data, |
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data->temp[attr->index])); |
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} |
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static ssize_t adt7x10_temp_store(struct device *dev, |
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struct device_attribute *da, |
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const char *buf, size_t count) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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int nr = attr->index; |
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long temp; |
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int ret; |
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ret = kstrtol(buf, 10, &temp); |
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if (ret) |
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return ret; |
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mutex_lock(&data->update_lock); |
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data->temp[nr] = ADT7X10_TEMP_TO_REG(temp); |
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ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], data->temp[nr]); |
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if (ret) |
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count = ret; |
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mutex_unlock(&data->update_lock); |
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return count; |
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} |
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static ssize_t adt7x10_t_hyst_show(struct device *dev, |
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struct device_attribute *da, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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int nr = attr->index; |
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int hyst; |
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hyst = (data->hyst & ADT7X10_T_HYST_MASK) * 1000; |
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/* |
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* hysteresis is stored as a 4 bit offset in the device, convert it |
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* to an absolute value |
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*/ |
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if (nr == 2) /* min has positive offset, others have negative */ |
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hyst = -hyst; |
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return sprintf(buf, "%d\n", |
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ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst); |
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} |
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static ssize_t adt7x10_t_hyst_store(struct device *dev, |
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struct device_attribute *da, |
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const char *buf, size_t count) |
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{ |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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int limit, ret; |
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long hyst; |
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ret = kstrtol(buf, 10, &hyst); |
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if (ret) |
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return ret; |
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/* convert absolute hysteresis value to a 4 bit delta value */ |
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limit = ADT7X10_REG_TO_TEMP(data, data->temp[1]); |
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hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX); |
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data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), |
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0, ADT7X10_T_HYST_MASK); |
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ret = adt7x10_write_byte(dev, ADT7X10_T_HYST, data->hyst); |
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if (ret) |
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return ret; |
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return count; |
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} |
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static ssize_t adt7x10_alarm_show(struct device *dev, |
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struct device_attribute *da, char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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int ret; |
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ret = adt7x10_read_byte(dev, ADT7X10_STATUS); |
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if (ret < 0) |
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return ret; |
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return sprintf(buf, "%d\n", !!(ret & attr->index)); |
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} |
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static ssize_t name_show(struct device *dev, struct device_attribute *da, |
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char *buf) |
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{ |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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return sprintf(buf, "%s\n", data->name); |
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} |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, adt7x10_temp, 0); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max, adt7x10_temp, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp1_min, adt7x10_temp, 2); |
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static SENSOR_DEVICE_ATTR_RW(temp1_crit, adt7x10_temp, 3); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adt7x10_t_hyst, 1); |
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static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, adt7x10_t_hyst, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp1_crit_hyst, adt7x10_t_hyst, 3); |
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static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, adt7x10_alarm, |
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ADT7X10_STAT_T_LOW); |
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adt7x10_alarm, |
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ADT7X10_STAT_T_HIGH); |
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static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, adt7x10_alarm, |
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ADT7X10_STAT_T_CRIT); |
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static DEVICE_ATTR_RO(name); |
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static struct attribute *adt7x10_attributes[] = { |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_min.dev_attr.attr, |
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&sensor_dev_attr_temp1_crit.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp1_min_hyst.dev_attr.attr, |
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&sensor_dev_attr_temp1_crit_hyst.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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NULL |
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}; |
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static const struct attribute_group adt7x10_group = { |
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.attrs = adt7x10_attributes, |
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}; |
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int adt7x10_probe(struct device *dev, const char *name, int irq, |
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const struct adt7x10_ops *ops) |
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{ |
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struct adt7x10_data *data; |
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int ret; |
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->ops = ops; |
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data->name = name; |
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dev_set_drvdata(dev, data); |
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mutex_init(&data->update_lock); |
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/* configure as specified */ |
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ret = adt7x10_read_byte(dev, ADT7X10_CONFIG); |
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if (ret < 0) { |
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dev_dbg(dev, "Can't read config? %d\n", ret); |
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return ret; |
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} |
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data->oldconfig = ret; |
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/* |
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* Set to 16 bit resolution, continous conversion and comparator mode. |
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*/ |
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data->config = data->oldconfig; |
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data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY | |
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ADT7X10_INT_POLARITY); |
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data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE; |
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if (data->config != data->oldconfig) { |
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ret = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config); |
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if (ret) |
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return ret; |
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} |
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dev_dbg(dev, "Config %02x\n", data->config); |
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ret = adt7x10_fill_cache(dev); |
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if (ret) |
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goto exit_restore; |
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/* Register sysfs hooks */ |
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ret = sysfs_create_group(&dev->kobj, &adt7x10_group); |
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if (ret) |
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goto exit_restore; |
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/* |
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* The I2C device will already have it's own 'name' attribute, but for |
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* the SPI device we need to register it. name will only be non NULL if |
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* the device doesn't register the 'name' attribute on its own. |
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*/ |
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if (name) { |
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ret = device_create_file(dev, &dev_attr_name); |
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if (ret) |
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goto exit_remove; |
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} |
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data->hwmon_dev = hwmon_device_register(dev); |
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if (IS_ERR(data->hwmon_dev)) { |
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ret = PTR_ERR(data->hwmon_dev); |
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goto exit_remove_name; |
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} |
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if (irq > 0) { |
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ret = request_threaded_irq(irq, NULL, adt7x10_irq_handler, |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
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dev_name(dev), dev); |
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if (ret) |
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goto exit_hwmon_device_unregister; |
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} |
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return 0; |
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exit_hwmon_device_unregister: |
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hwmon_device_unregister(data->hwmon_dev); |
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exit_remove_name: |
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if (name) |
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device_remove_file(dev, &dev_attr_name); |
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exit_remove: |
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sysfs_remove_group(&dev->kobj, &adt7x10_group); |
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exit_restore: |
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adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(adt7x10_probe); |
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int adt7x10_remove(struct device *dev, int irq) |
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{ |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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if (irq > 0) |
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free_irq(irq, dev); |
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hwmon_device_unregister(data->hwmon_dev); |
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if (data->name) |
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device_remove_file(dev, &dev_attr_name); |
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sysfs_remove_group(&dev->kobj, &adt7x10_group); |
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if (data->oldconfig != data->config) |
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adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(adt7x10_remove); |
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#ifdef CONFIG_PM_SLEEP |
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static int adt7x10_suspend(struct device *dev) |
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{ |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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return adt7x10_write_byte(dev, ADT7X10_CONFIG, |
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data->config | ADT7X10_PD); |
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} |
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static int adt7x10_resume(struct device *dev) |
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{ |
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struct adt7x10_data *data = dev_get_drvdata(dev); |
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return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config); |
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} |
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SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume); |
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EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops); |
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#endif /* CONFIG_PM_SLEEP */ |
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MODULE_AUTHOR("Hartmut Knaack"); |
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MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code"); |
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MODULE_LICENSE("GPL");
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