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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * max6650.c - Part of lm_sensors, Linux kernel modules for hardware
- * monitoring.
- *
- * (C) 2007 by Hans J. Koch <[email protected]>
- *
- * based on code written by John Morris <[email protected]>
- * Copyright (c) 2003 Spirent Communications
- * and Claus Gindhart <[email protected]>
- *
- * This module has only been tested with the MAX6650 chip. It should
- * also work with the MAX6651. It does not distinguish max6650 and max6651
- * chips.
- *
- * The datasheet was last seen at:
- *
- * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/jiffies.h>
- #include <linux/i2c.h>
- #include <linux/hwmon.h>
- #include <linux/hwmon-sysfs.h>
- #include <linux/err.h>
- #include <linux/of_device.h>
- #include <linux/thermal.h>
- /*
- * Insmod parameters
- */
- /* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */
- static int fan_voltage;
- /* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */
- static int prescaler;
- /* clock: The clock frequency of the chip (max6651 can be clocked externally) */
- static int clock = 254000;
- module_param(fan_voltage, int, 0444);
- module_param(prescaler, int, 0444);
- module_param(clock, int, 0444);
- /*
- * MAX 6650/6651 registers
- */
- #define MAX6650_REG_SPEED 0x00
- #define MAX6650_REG_CONFIG 0x02
- #define MAX6650_REG_GPIO_DEF 0x04
- #define MAX6650_REG_DAC 0x06
- #define MAX6650_REG_ALARM_EN 0x08
- #define MAX6650_REG_ALARM 0x0A
- #define MAX6650_REG_TACH0 0x0C
- #define MAX6650_REG_TACH1 0x0E
- #define MAX6650_REG_TACH2 0x10
- #define MAX6650_REG_TACH3 0x12
- #define MAX6650_REG_GPIO_STAT 0x14
- #define MAX6650_REG_COUNT 0x16
- /*
- * Config register bits
- */
- #define MAX6650_CFG_V12 0x08
- #define MAX6650_CFG_PRESCALER_MASK 0x07
- #define MAX6650_CFG_PRESCALER_2 0x01
- #define MAX6650_CFG_PRESCALER_4 0x02
- #define MAX6650_CFG_PRESCALER_8 0x03
- #define MAX6650_CFG_PRESCALER_16 0x04
- #define MAX6650_CFG_MODE_MASK 0x30
- #define MAX6650_CFG_MODE_ON 0x00
- #define MAX6650_CFG_MODE_OFF 0x10
- #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20
- #define MAX6650_CFG_MODE_OPEN_LOOP 0x30
- #define MAX6650_COUNT_MASK 0x03
- /*
- * Alarm status register bits
- */
- #define MAX6650_ALRM_MAX 0x01
- #define MAX6650_ALRM_MIN 0x02
- #define MAX6650_ALRM_TACH 0x04
- #define MAX6650_ALRM_GPIO1 0x08
- #define MAX6650_ALRM_GPIO2 0x10
- /* Minimum and maximum values of the FAN-RPM */
- #define FAN_RPM_MIN 240
- #define FAN_RPM_MAX 30000
- #define DIV_FROM_REG(reg) (1 << ((reg) & 7))
- #define DAC_LIMIT(v12) ((v12) ? 180 : 76)
- /*
- * Client data (each client gets its own)
- */
- struct max6650_data {
- struct i2c_client *client;
- struct mutex update_lock; /* protect alarm register updates */
- int nr_fans;
- bool valid; /* false until following fields are valid */
- unsigned long last_updated; /* in jiffies */
- /* register values */
- u8 speed;
- u8 config;
- u8 tach[4];
- u8 count;
- u8 dac;
- u8 alarm;
- u8 alarm_en;
- unsigned long cooling_dev_state;
- };
- static const u8 tach_reg[] = {
- MAX6650_REG_TACH0,
- MAX6650_REG_TACH1,
- MAX6650_REG_TACH2,
- MAX6650_REG_TACH3,
- };
- static const struct of_device_id __maybe_unused max6650_dt_match[] = {
- {
- .compatible = "maxim,max6650",
- .data = (void *)1
- },
- {
- .compatible = "maxim,max6651",
- .data = (void *)4
- },
- { },
- };
- MODULE_DEVICE_TABLE(of, max6650_dt_match);
- static int dac_to_pwm(int dac, bool v12)
- {
- /*
- * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
- * Lower DAC values mean higher speeds.
- */
- return clamp_val(255 - (255 * dac) / DAC_LIMIT(v12), 0, 255);
- }
- static u8 pwm_to_dac(unsigned int pwm, bool v12)
- {
- int limit = DAC_LIMIT(v12);
- return limit - (limit * pwm) / 255;
- }
- static struct max6650_data *max6650_update_device(struct device *dev)
- {
- struct max6650_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- int reg, err = 0;
- int i;
- mutex_lock(&data->update_lock);
- if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- for (i = 0; i < data->nr_fans; i++) {
- reg = i2c_smbus_read_byte_data(client, tach_reg[i]);
- if (reg < 0) {
- err = reg;
- goto error;
- }
- data->tach[i] = reg;
- }
- /*
- * Alarms are cleared on read in case the condition that
- * caused the alarm is removed. Keep the value latched here
- * for providing the register through different alarm files.
- */
- reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM);
- if (reg < 0) {
- err = reg;
- goto error;
- }
- data->alarm |= reg;
- data->last_updated = jiffies;
- data->valid = true;
- }
- error:
- mutex_unlock(&data->update_lock);
- if (err)
- data = ERR_PTR(err);
- return data;
- }
- /*
- * Change the operating mode of the chip (if needed).
- * mode is one of the MAX6650_CFG_MODE_* values.
- */
- static int max6650_set_operating_mode(struct max6650_data *data, u8 mode)
- {
- int result;
- u8 config = data->config;
- if (mode == (config & MAX6650_CFG_MODE_MASK))
- return 0;
- config = (config & ~MAX6650_CFG_MODE_MASK) | mode;
- result = i2c_smbus_write_byte_data(data->client, MAX6650_REG_CONFIG,
- config);
- if (result < 0)
- return result;
- data->config = config;
- return 0;
- }
- /*
- * Set the fan speed to the specified RPM (or read back the RPM setting).
- * This works in closed loop mode only. Use pwm1 for open loop speed setting.
- *
- * The MAX6650/1 will automatically control fan speed when in closed loop
- * mode.
- *
- * Assumptions:
- *
- * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use
- * the clock module parameter if you need to fine tune this.
- *
- * 2) The prescaler (low three bits of the config register) has already
- * been set to an appropriate value. Use the prescaler module parameter
- * if your BIOS doesn't initialize the chip properly.
- *
- * The relevant equations are given on pages 21 and 22 of the datasheet.
- *
- * From the datasheet, the relevant equation when in regulation is:
- *
- * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE
- *
- * where:
- *
- * fCLK is the oscillator frequency (either the 254kHz internal
- * oscillator or the externally applied clock)
- *
- * KTACH is the value in the speed register
- *
- * FanSpeed is the speed of the fan in rps
- *
- * KSCALE is the prescaler value (1, 2, 4, 8, or 16)
- *
- * When reading, we need to solve for FanSpeed. When writing, we need to
- * solve for KTACH.
- *
- * Note: this tachometer is completely separate from the tachometers
- * used to measure the fan speeds. Only one fan's speed (fan1) is
- * controlled.
- */
- static int max6650_set_target(struct max6650_data *data, unsigned long rpm)
- {
- int kscale, ktach;
- if (rpm == 0)
- return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF);
- rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
- /*
- * Divide the required speed by 60 to get from rpm to rps, then
- * use the datasheet equation:
- *
- * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1
- */
- kscale = DIV_FROM_REG(data->config);
- ktach = ((clock * kscale) / (256 * rpm / 60)) - 1;
- if (ktach < 0)
- ktach = 0;
- if (ktach > 255)
- ktach = 255;
- data->speed = ktach;
- return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED,
- data->speed);
- }
- /*
- * Get gpio alarm status:
- * Possible values:
- * 0 = no alarm
- * 1 = alarm
- */
- static ssize_t alarm_show(struct device *dev,
- struct device_attribute *devattr, char *buf)
- {
- struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
- struct max6650_data *data = max6650_update_device(dev);
- bool alarm;
- if (IS_ERR(data))
- return PTR_ERR(data);
- alarm = data->alarm & attr->index;
- if (alarm) {
- mutex_lock(&data->update_lock);
- data->alarm &= ~attr->index;
- data->valid = false;
- mutex_unlock(&data->update_lock);
- }
- return sprintf(buf, "%d\n", alarm);
- }
- static SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1);
- static SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2);
- static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
- int n)
- {
- struct device *dev = kobj_to_dev(kobj);
- struct max6650_data *data = dev_get_drvdata(dev);
- struct device_attribute *devattr;
- /*
- * Hide the alarms that have not been enabled by the firmware
- */
- devattr = container_of(a, struct device_attribute, attr);
- if (devattr == &sensor_dev_attr_gpio1_alarm.dev_attr ||
- devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) {
- if (!(data->alarm_en & to_sensor_dev_attr(devattr)->index))
- return 0;
- }
- return a->mode;
- }
- static struct attribute *max6650_attrs[] = {
- &sensor_dev_attr_gpio1_alarm.dev_attr.attr,
- &sensor_dev_attr_gpio2_alarm.dev_attr.attr,
- NULL
- };
- static const struct attribute_group max6650_group = {
- .attrs = max6650_attrs,
- .is_visible = max6650_attrs_visible,
- };
- static const struct attribute_group *max6650_groups[] = {
- &max6650_group,
- NULL
- };
- static int max6650_init_client(struct max6650_data *data,
- struct i2c_client *client)
- {
- struct device *dev = &client->dev;
- int reg;
- int err;
- u32 voltage;
- u32 prescale;
- u32 target_rpm;
- if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt",
- &voltage))
- voltage = fan_voltage;
- else
- voltage /= 1000000; /* Microvolts to volts */
- if (of_property_read_u32(dev->of_node, "maxim,fan-prescale",
- &prescale))
- prescale = prescaler;
- reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
- if (reg < 0) {
- dev_err(dev, "Error reading config register, aborting.\n");
- return reg;
- }
- switch (voltage) {
- case 0:
- break;
- case 5:
- reg &= ~MAX6650_CFG_V12;
- break;
- case 12:
- reg |= MAX6650_CFG_V12;
- break;
- default:
- dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage);
- }
- switch (prescale) {
- case 0:
- break;
- case 1:
- reg &= ~MAX6650_CFG_PRESCALER_MASK;
- break;
- case 2:
- reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
- | MAX6650_CFG_PRESCALER_2;
- break;
- case 4:
- reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
- | MAX6650_CFG_PRESCALER_4;
- break;
- case 8:
- reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
- | MAX6650_CFG_PRESCALER_8;
- break;
- case 16:
- reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
- | MAX6650_CFG_PRESCALER_16;
- break;
- default:
- dev_err(dev, "illegal value for prescaler (%d)\n", prescale);
- }
- dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n",
- (reg & MAX6650_CFG_V12) ? 12 : 5,
- 1 << (reg & MAX6650_CFG_PRESCALER_MASK));
- err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg);
- if (err) {
- dev_err(dev, "Config write error, aborting.\n");
- return err;
- }
- data->config = reg;
- reg = i2c_smbus_read_byte_data(client, MAX6650_REG_SPEED);
- if (reg < 0) {
- dev_err(dev, "Failed to read speed register, aborting.\n");
- return reg;
- }
- data->speed = reg;
- reg = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
- if (reg < 0) {
- dev_err(dev, "Failed to read DAC register, aborting.\n");
- return reg;
- }
- data->dac = reg;
- reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
- if (reg < 0) {
- dev_err(dev, "Failed to read count register, aborting.\n");
- return reg;
- }
- data->count = reg;
- reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
- if (reg < 0) {
- dev_err(dev, "Failed to read alarm configuration, aborting.\n");
- return reg;
- }
- data->alarm_en = reg;
- if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm",
- &target_rpm)) {
- max6650_set_target(data, target_rpm);
- max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP);
- }
- return 0;
- }
- static int max6650_get_max_state(struct thermal_cooling_device *cdev,
- unsigned long *state)
- {
- *state = 255;
- return 0;
- }
- static int max6650_get_cur_state(struct thermal_cooling_device *cdev,
- unsigned long *state)
- {
- struct max6650_data *data = cdev->devdata;
- *state = data->cooling_dev_state;
- return 0;
- }
- static int max6650_set_cur_state(struct thermal_cooling_device *cdev,
- unsigned long state)
- {
- struct max6650_data *data = cdev->devdata;
- struct i2c_client *client = data->client;
- int err;
- state = clamp_val(state, 0, 255);
- mutex_lock(&data->update_lock);
- data->dac = pwm_to_dac(state, data->config & MAX6650_CFG_V12);
- err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
- if (!err) {
- max6650_set_operating_mode(data, state ?
- MAX6650_CFG_MODE_OPEN_LOOP :
- MAX6650_CFG_MODE_OFF);
- data->cooling_dev_state = state;
- }
- mutex_unlock(&data->update_lock);
- return err;
- }
- static const struct thermal_cooling_device_ops max6650_cooling_ops = {
- .get_max_state = max6650_get_max_state,
- .get_cur_state = max6650_get_cur_state,
- .set_cur_state = max6650_set_cur_state,
- };
- static int max6650_read(struct device *dev, enum hwmon_sensor_types type,
- u32 attr, int channel, long *val)
- {
- struct max6650_data *data = max6650_update_device(dev);
- int mode;
- if (IS_ERR(data))
- return PTR_ERR(data);
- switch (type) {
- case hwmon_pwm:
- switch (attr) {
- case hwmon_pwm_input:
- *val = dac_to_pwm(data->dac,
- data->config & MAX6650_CFG_V12);
- break;
- case hwmon_pwm_enable:
- /*
- * Possible values:
- * 0 = Fan always on
- * 1 = Open loop, Voltage is set according to speed,
- * not regulated.
- * 2 = Closed loop, RPM for all fans regulated by fan1
- * tachometer
- * 3 = Fan off
- */
- mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
- *val = (4 - mode) & 3; /* {0 1 2 3} -> {0 3 2 1} */
- break;
- default:
- return -EOPNOTSUPP;
- }
- break;
- case hwmon_fan:
- switch (attr) {
- case hwmon_fan_input:
- /*
- * Calculation details:
- *
- * Each tachometer counts over an interval given by the
- * "count" register (0.25, 0.5, 1 or 2 seconds).
- * The driver assumes that the fans produce two pulses
- * per revolution (this seems to be the most common).
- */
- *val = DIV_ROUND_CLOSEST(data->tach[channel] * 120,
- DIV_FROM_REG(data->count));
- break;
- case hwmon_fan_div:
- *val = DIV_FROM_REG(data->count);
- break;
- case hwmon_fan_target:
- /*
- * Use the datasheet equation:
- * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)]
- * then multiply by 60 to give rpm.
- */
- *val = 60 * DIV_FROM_REG(data->config) * clock /
- (256 * (data->speed + 1));
- break;
- case hwmon_fan_min_alarm:
- *val = !!(data->alarm & MAX6650_ALRM_MIN);
- data->alarm &= ~MAX6650_ALRM_MIN;
- data->valid = false;
- break;
- case hwmon_fan_max_alarm:
- *val = !!(data->alarm & MAX6650_ALRM_MAX);
- data->alarm &= ~MAX6650_ALRM_MAX;
- data->valid = false;
- break;
- case hwmon_fan_fault:
- *val = !!(data->alarm & MAX6650_ALRM_TACH);
- data->alarm &= ~MAX6650_ALRM_TACH;
- data->valid = false;
- break;
- default:
- return -EOPNOTSUPP;
- }
- break;
- default:
- return -EOPNOTSUPP;
- }
- return 0;
- }
- static const u8 max6650_pwm_modes[] = {
- MAX6650_CFG_MODE_ON,
- MAX6650_CFG_MODE_OPEN_LOOP,
- MAX6650_CFG_MODE_CLOSED_LOOP,
- MAX6650_CFG_MODE_OFF,
- };
- static int max6650_write(struct device *dev, enum hwmon_sensor_types type,
- u32 attr, int channel, long val)
- {
- struct max6650_data *data = dev_get_drvdata(dev);
- int ret = 0;
- u8 reg;
- mutex_lock(&data->update_lock);
- switch (type) {
- case hwmon_pwm:
- switch (attr) {
- case hwmon_pwm_input:
- reg = pwm_to_dac(clamp_val(val, 0, 255),
- data->config & MAX6650_CFG_V12);
- ret = i2c_smbus_write_byte_data(data->client,
- MAX6650_REG_DAC, reg);
- if (ret)
- break;
- data->dac = reg;
- break;
- case hwmon_pwm_enable:
- if (val < 0 || val >= ARRAY_SIZE(max6650_pwm_modes)) {
- ret = -EINVAL;
- break;
- }
- ret = max6650_set_operating_mode(data,
- max6650_pwm_modes[val]);
- break;
- default:
- ret = -EOPNOTSUPP;
- break;
- }
- break;
- case hwmon_fan:
- switch (attr) {
- case hwmon_fan_div:
- switch (val) {
- case 1:
- reg = 0;
- break;
- case 2:
- reg = 1;
- break;
- case 4:
- reg = 2;
- break;
- case 8:
- reg = 3;
- break;
- default:
- ret = -EINVAL;
- goto error;
- }
- ret = i2c_smbus_write_byte_data(data->client,
- MAX6650_REG_COUNT, reg);
- if (ret)
- break;
- data->count = reg;
- break;
- case hwmon_fan_target:
- if (val < 0) {
- ret = -EINVAL;
- break;
- }
- ret = max6650_set_target(data, val);
- break;
- default:
- ret = -EOPNOTSUPP;
- break;
- }
- break;
- default:
- ret = -EOPNOTSUPP;
- break;
- }
- error:
- mutex_unlock(&data->update_lock);
- return ret;
- }
- static umode_t max6650_is_visible(const void *_data,
- enum hwmon_sensor_types type, u32 attr,
- int channel)
- {
- const struct max6650_data *data = _data;
- if (channel && (channel >= data->nr_fans || type != hwmon_fan))
- return 0;
- switch (type) {
- case hwmon_fan:
- switch (attr) {
- case hwmon_fan_input:
- return 0444;
- case hwmon_fan_target:
- case hwmon_fan_div:
- return 0644;
- case hwmon_fan_min_alarm:
- if (data->alarm_en & MAX6650_ALRM_MIN)
- return 0444;
- break;
- case hwmon_fan_max_alarm:
- if (data->alarm_en & MAX6650_ALRM_MAX)
- return 0444;
- break;
- case hwmon_fan_fault:
- if (data->alarm_en & MAX6650_ALRM_TACH)
- return 0444;
- break;
- default:
- break;
- }
- break;
- case hwmon_pwm:
- switch (attr) {
- case hwmon_pwm_input:
- case hwmon_pwm_enable:
- return 0644;
- default:
- break;
- }
- break;
- default:
- break;
- }
- return 0;
- }
- static const struct hwmon_channel_info *max6650_info[] = {
- HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_DIV |
- HWMON_F_MIN_ALARM | HWMON_F_MAX_ALARM |
- HWMON_F_FAULT,
- HWMON_F_INPUT, HWMON_F_INPUT, HWMON_F_INPUT),
- HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
- NULL
- };
- static const struct hwmon_ops max6650_hwmon_ops = {
- .read = max6650_read,
- .write = max6650_write,
- .is_visible = max6650_is_visible,
- };
- static const struct hwmon_chip_info max6650_chip_info = {
- .ops = &max6650_hwmon_ops,
- .info = max6650_info,
- };
- static const struct i2c_device_id max6650_id[];
- static int max6650_probe(struct i2c_client *client)
- {
- struct thermal_cooling_device *cooling_dev;
- struct device *dev = &client->dev;
- const struct of_device_id *of_id =
- of_match_device(of_match_ptr(max6650_dt_match), dev);
- struct max6650_data *data;
- struct device *hwmon_dev;
- int err;
- data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- data->client = client;
- i2c_set_clientdata(client, data);
- mutex_init(&data->update_lock);
- data->nr_fans = of_id ? (int)(uintptr_t)of_id->data :
- i2c_match_id(max6650_id, client)->driver_data;
- /*
- * Initialize the max6650 chip
- */
- err = max6650_init_client(data, client);
- if (err)
- return err;
- hwmon_dev = devm_hwmon_device_register_with_info(dev,
- client->name, data,
- &max6650_chip_info,
- max6650_groups);
- err = PTR_ERR_OR_ZERO(hwmon_dev);
- if (err)
- return err;
- if (IS_ENABLED(CONFIG_THERMAL)) {
- cooling_dev = devm_thermal_of_cooling_device_register(dev,
- dev->of_node, client->name,
- data, &max6650_cooling_ops);
- if (IS_ERR(cooling_dev)) {
- dev_warn(dev, "thermal cooling device register failed: %ld\n",
- PTR_ERR(cooling_dev));
- }
- }
- return 0;
- }
- static const struct i2c_device_id max6650_id[] = {
- { "max6650", 1 },
- { "max6651", 4 },
- { }
- };
- MODULE_DEVICE_TABLE(i2c, max6650_id);
- static struct i2c_driver max6650_driver = {
- .driver = {
- .name = "max6650",
- .of_match_table = of_match_ptr(max6650_dt_match),
- },
- .probe_new = max6650_probe,
- .id_table = max6650_id,
- };
- module_i2c_driver(max6650_driver);
- MODULE_AUTHOR("Hans J. Koch");
- MODULE_DESCRIPTION("MAX6650 sensor driver");
- MODULE_LICENSE("GPL");
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