// 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 <hjk@hansjkoch.de>
 *
 * based on code written by John Morris <john.morris@spirentcom.com>
 * Copyright (c) 2003 Spirent Communications
 * and Claus Gindhart <claus.gindhart@kontron.com>
 *
 * 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.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 * const 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;
        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 = (uintptr_t)i2c_get_match_data(client);

        /*
         * 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          = max6650_probe,
        .id_table       = max6650_id,
};

module_i2c_driver(max6650_driver);

MODULE_AUTHOR("Hans J. Koch");
MODULE_DESCRIPTION("MAX6650 sensor driver");
MODULE_LICENSE("GPL");