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c21eced115
Convert driver to with_info hwmon API to simplify the code and to reduce its size. No functional change. Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
439 lines
10 KiB
C
439 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* lm92 - Hardware monitoring driver
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* Copyright (C) 2005-2008 Jean Delvare <jdelvare@suse.de>
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*
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* Based on the lm90 driver, with some ideas taken from the lm_sensors
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* lm92 driver as well.
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*
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* The LM92 is a sensor chip made by National Semiconductor. It reports
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* its own temperature with a 0.0625 deg resolution and a 0.33 deg
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* accuracy. Complete datasheet can be obtained from National's website
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* at:
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* http://www.national.com/pf/LM/LM92.html
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*
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* This driver also supports the MAX6635 sensor chip made by Maxim.
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* This chip is compatible with the LM92, but has a lesser accuracy
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* (1.0 deg). Complete datasheet can be obtained from Maxim's website
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* at:
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* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074
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*
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* Since the LM92 was the first chipset supported by this driver, most
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* comments will refer to this chipset, but are actually general and
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* concern all supported chipsets, unless mentioned otherwise.
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*
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* Support could easily be added for the National Semiconductor LM76
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* and Maxim MAX6633 and MAX6634 chips, which are mostly compatible
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* with the LM92.
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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/*
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* The LM92 and MAX6635 have 2 two-state pins for address selection,
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* resulting in 4 possible addresses.
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*/
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
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I2C_CLIENT_END };
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/* The LM92 registers */
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#define LM92_REG_CONFIG 0x01 /* 8-bit, RW */
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#define LM92_REG_TEMP 0x00 /* 16-bit, RO */
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#define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */
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#define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */
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#define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */
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#define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */
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#define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */
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/*
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* The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius,
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* left-justified in 16-bit registers. No rounding is done, with such
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* a resolution it's just not worth it. Note that the MAX6635 doesn't
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* make use of the 4 lower bits for limits (i.e. effective resolution
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* for limits is 1 degree Celsius).
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*/
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static inline int TEMP_FROM_REG(s16 reg)
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{
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return reg / 8 * 625 / 10;
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}
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static inline s16 TEMP_TO_REG(long val, int resolution)
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{
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val = clamp_val(val, -60000, 160000);
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return DIV_ROUND_CLOSEST(val << (resolution - 9), 1000) << (16 - resolution);
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}
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/* Alarm flags are stored in the 3 LSB of the temperature register */
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static inline u8 ALARMS_FROM_REG(s16 reg)
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{
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return reg & 0x0007;
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}
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/* Client data (each client gets its own) */
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struct lm92_data {
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struct regmap *regmap;
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struct mutex update_lock;
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int resolution;
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};
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static int lm92_temp_read(struct lm92_data *data, u32 attr, int channel, long *val)
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{
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int reg = -1, hyst_reg = -1, alarm_bit = 0;
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struct regmap *regmap = data->regmap;
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u32 temp;
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int ret;
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switch (attr) {
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case hwmon_temp_input:
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reg = LM92_REG_TEMP;
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break;
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case hwmon_temp_min:
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reg = LM92_REG_TEMP_LOW;
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break;
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case hwmon_temp_max:
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reg = LM92_REG_TEMP_HIGH;
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break;
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case hwmon_temp_crit:
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reg = LM92_REG_TEMP_CRIT;
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break;
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case hwmon_temp_min_hyst:
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hyst_reg = LM92_REG_TEMP_LOW;
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break;
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case hwmon_temp_max_hyst:
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hyst_reg = LM92_REG_TEMP_HIGH;
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break;
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case hwmon_temp_crit_hyst:
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hyst_reg = LM92_REG_TEMP_CRIT;
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break;
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case hwmon_temp_min_alarm:
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alarm_bit = 0;
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break;
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case hwmon_temp_max_alarm:
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alarm_bit = 1;
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break;
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case hwmon_temp_crit_alarm:
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alarm_bit = 2;
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break;
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default:
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return -EOPNOTSUPP;
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}
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if (reg >= 0) {
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ret = regmap_read(regmap, reg, &temp);
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if (ret < 0)
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return ret;
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*val = TEMP_FROM_REG(temp);
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} else if (hyst_reg >= 0) {
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u32 regs[2] = { hyst_reg, LM92_REG_TEMP_HYST };
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u16 regvals[2];
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ret = regmap_multi_reg_read(regmap, regs, regvals, 2);
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if (ret)
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return ret;
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if (attr == hwmon_temp_min_hyst)
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*val = TEMP_FROM_REG(regvals[0]) + TEMP_FROM_REG(regvals[1]);
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else
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*val = TEMP_FROM_REG(regvals[0]) - TEMP_FROM_REG(regvals[1]);
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} else {
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ret = regmap_read(regmap, LM92_REG_TEMP, &temp);
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if (ret)
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return ret;
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*val = !!(temp & BIT(alarm_bit));
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}
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return 0;
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}
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static int lm92_chip_read(struct lm92_data *data, u32 attr, long *val)
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{
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u32 temp;
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int ret;
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switch (attr) {
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case hwmon_chip_alarms:
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ret = regmap_read(data->regmap, LM92_REG_TEMP, &temp);
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if (ret)
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return ret;
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*val = ALARMS_FROM_REG(temp);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int lm92_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, long *val)
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{
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struct lm92_data *data = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_chip:
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return lm92_chip_read(data, attr, val);
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case hwmon_temp:
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return lm92_temp_read(data, attr, channel, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static int lm92_temp_write(struct lm92_data *data, u32 attr, long val)
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{
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struct regmap *regmap = data->regmap;
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int reg, err;
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u32 temp;
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switch (attr) {
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case hwmon_temp_min:
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reg = LM92_REG_TEMP_LOW;
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break;
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case hwmon_temp_max:
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reg = LM92_REG_TEMP_HIGH;
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break;
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case hwmon_temp_crit:
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reg = LM92_REG_TEMP_CRIT;
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break;
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case hwmon_temp_crit_hyst:
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val = clamp_val(val, -120000, 220000);
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mutex_lock(&data->update_lock);
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err = regmap_read(regmap, LM92_REG_TEMP_CRIT, &temp);
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if (err)
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goto unlock;
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val = TEMP_TO_REG(TEMP_FROM_REG(temp) - val, data->resolution);
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err = regmap_write(regmap, LM92_REG_TEMP_HYST, val);
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unlock:
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mutex_unlock(&data->update_lock);
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return err;
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default:
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return -EOPNOTSUPP;
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}
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return regmap_write(regmap, reg, TEMP_TO_REG(val, data->resolution));
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}
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static int lm92_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct lm92_data *data = dev_get_drvdata(dev);
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switch (type) {
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case hwmon_temp:
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return lm92_temp_write(data, attr, val);
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default:
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return -EOPNOTSUPP;
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}
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}
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static umode_t lm92_is_visible(const void *_data, enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (type) {
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case hwmon_chip:
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switch (attr) {
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case hwmon_chip_alarms:
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return 0444;
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default:
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break;
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}
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break;
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_min:
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case hwmon_temp_max:
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case hwmon_temp_crit:
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case hwmon_temp_crit_hyst:
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return 0644;
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case hwmon_temp_input:
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case hwmon_temp_min_hyst:
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case hwmon_temp_max_hyst:
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case hwmon_temp_min_alarm:
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case hwmon_temp_max_alarm:
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case hwmon_temp_crit_alarm:
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return 0444;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static const struct hwmon_channel_info * const lm92_info[] = {
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HWMON_CHANNEL_INFO(chip, HWMON_C_ALARMS),
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT |
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HWMON_T_MIN | HWMON_T_MIN_HYST |
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HWMON_T_MAX | HWMON_T_MAX_HYST |
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HWMON_T_CRIT | HWMON_T_CRIT_HYST |
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HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM |
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HWMON_T_CRIT_ALARM),
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NULL
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};
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static const struct hwmon_ops lm92_hwmon_ops = {
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.is_visible = lm92_is_visible,
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.read = lm92_read,
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.write = lm92_write,
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};
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static const struct hwmon_chip_info lm92_chip_info = {
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.ops = &lm92_hwmon_ops,
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.info = lm92_info,
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};
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/*
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* Detection and registration
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*/
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static int lm92_init_client(struct regmap *regmap)
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{
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return regmap_clear_bits(regmap, LM92_REG_CONFIG, 0x01);
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}
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm92_detect(struct i2c_client *new_client,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = new_client->adapter;
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u8 config_addr = LM92_REG_CONFIG;
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u8 man_id_addr = LM92_REG_MAN_ID;
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int i, regval;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
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| I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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/*
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* Register values repeat with multiples of 8.
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* Read twice to improve detection accuracy.
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*/
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for (i = 0; i < 2; i++) {
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regval = i2c_smbus_read_word_data(new_client, man_id_addr);
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if (regval != 0x0180)
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return -ENODEV;
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regval = i2c_smbus_read_byte_data(new_client, config_addr);
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if (regval < 0 || (regval & 0xe0))
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return -ENODEV;
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config_addr += 8;
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man_id_addr += 8;
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}
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strscpy(info->type, "lm92", I2C_NAME_SIZE);
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return 0;
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}
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/* regmap */
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static int lm92_reg_read(void *context, unsigned int reg, unsigned int *val)
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{
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int ret;
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if (reg == LM92_REG_CONFIG)
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ret = i2c_smbus_read_byte_data(context, reg);
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else
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ret = i2c_smbus_read_word_swapped(context, reg);
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if (ret < 0)
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return ret;
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*val = ret;
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return 0;
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}
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static int lm92_reg_write(void *context, unsigned int reg, unsigned int val)
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{
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if (reg == LM92_REG_CONFIG)
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return i2c_smbus_write_byte_data(context, LM92_REG_CONFIG, val);
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return i2c_smbus_write_word_swapped(context, reg, val);
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}
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static bool lm92_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
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return reg == LM92_REG_TEMP;
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}
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static bool lm92_regmap_is_writeable(struct device *dev, unsigned int reg)
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{
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return reg >= LM92_REG_CONFIG;
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}
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static const struct regmap_config lm92_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = LM92_REG_TEMP_HIGH,
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.cache_type = REGCACHE_MAPLE,
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.volatile_reg = lm92_regmap_is_volatile,
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.writeable_reg = lm92_regmap_is_writeable,
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};
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static const struct regmap_bus lm92_regmap_bus = {
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.reg_write = lm92_reg_write,
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.reg_read = lm92_reg_read,
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};
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static int lm92_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct device *hwmon_dev;
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struct lm92_data *data;
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struct regmap *regmap;
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int err;
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regmap = devm_regmap_init(dev, &lm92_regmap_bus, client,
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&lm92_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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data = devm_kzalloc(dev, sizeof(struct lm92_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->regmap = regmap;
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data->resolution = (unsigned long)i2c_get_match_data(client);
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mutex_init(&data->update_lock);
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/* Initialize the chipset */
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err = lm92_init_client(regmap);
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if (err)
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return err;
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hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
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&lm92_chip_info, NULL);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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/*
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* Module and driver stuff
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*/
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/* .driver_data is limit register resolution */
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static const struct i2c_device_id lm92_id[] = {
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{ "lm92", 13 },
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{ "max6635", 9 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, lm92_id);
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static struct i2c_driver lm92_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "lm92",
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},
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.probe = lm92_probe,
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.id_table = lm92_id,
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.detect = lm92_detect,
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.address_list = normal_i2c,
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};
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module_i2c_driver(lm92_driver);
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MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
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MODULE_DESCRIPTION("LM92/MAX6635 driver");
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MODULE_LICENSE("GPL");
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