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/*

 * max1619.c - Part of lm_sensors, Linux kernel modules for hardware

 *             monitoring

 * Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>

 *                         Jean Delvare <khali@linux-fr.org>

 *

 * Based on the lm90 driver. The MAX1619 is a sensor chip made by Maxim.

 * It reports up to two temperatures (its own plus up to

 * one external one). Complete datasheet can be

 * obtained from Maxim's website at:

 *   http://pdfserv.maxim-ic.com/en/ds/MAX1619.pdf

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#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/err.h>

#include <linux/mutex.h>

#include <linux/sysfs.h>

static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,

                                        0x29, 0x2a, 0x2b,

                                        0x4c, 0x4d, 0x4e,

                                        I2C_CLIENT_END };

/*

 * Insmod parameters

 */

I2C_CLIENT_INSMOD_1(max1619);

/*

 * The MAX1619 registers

 */

#define MAX1619_REG_R_MAN_ID            0xFE

#define MAX1619_REG_R_CHIP_ID           0xFF

#define MAX1619_REG_R_CONFIG            0x03

#define MAX1619_REG_W_CONFIG            0x09

#define MAX1619_REG_R_CONVRATE          0x04

#define MAX1619_REG_W_CONVRATE          0x0A

#define MAX1619_REG_R_STATUS            0x02

#define MAX1619_REG_R_LOCAL_TEMP        0x00

#define MAX1619_REG_R_REMOTE_TEMP       0x01

#define MAX1619_REG_R_REMOTE_HIGH       0x07

#define MAX1619_REG_W_REMOTE_HIGH       0x0D

#define MAX1619_REG_R_REMOTE_LOW        0x08

#define MAX1619_REG_W_REMOTE_LOW        0x0E

#define MAX1619_REG_R_REMOTE_CRIT       0x10

#define MAX1619_REG_W_REMOTE_CRIT       0x12

#define MAX1619_REG_R_TCRIT_HYST        0x11

#define MAX1619_REG_W_TCRIT_HYST        0x13

/*

 * Conversions and various macros

 */

#define TEMP_FROM_REG(val)      ((val & 0x80 ? val-0x100 : val) * 1000)

#define TEMP_TO_REG(val)        ((val < 0 ? val+0x100*1000 : val) / 1000)

/*

 * Functions declaration

 */

static int max1619_attach_adapter(struct i2c_adapter *adapter);

static int max1619_detect(struct i2c_adapter *adapter, int address,

        int kind);

static void max1619_init_client(struct i2c_client *client);

static int max1619_detach_client(struct i2c_client *client);

static struct max1619_data *max1619_update_device(struct device *dev);

/*

 * Driver data (common to all clients)

 */

static struct i2c_driver max1619_driver = {

        .driver = {

                .name   = "max1619",

        },

        .attach_adapter = max1619_attach_adapter,

        .detach_client  = max1619_detach_client,

};

/*

 * Client data (each client gets its own)

 */

struct max1619_data {

        struct i2c_client client;

        struct device *hwmon_dev;

        struct mutex update_lock;

        char valid; /* zero until following fields are valid */

        unsigned long last_updated; /* in jiffies */

        /* registers values */

        u8 temp_input1; /* local */

        u8 temp_input2, temp_low2, temp_high2; /* remote */

        u8 temp_crit2;

        u8 temp_hyst2;

        u8 alarms;

};

/*

 * Sysfs stuff

 */

#define show_temp(value) \

static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \

{ \

        struct max1619_data *data = max1619_update_device(dev); \

        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \

}

show_temp(temp_input1);

show_temp(temp_input2);

show_temp(temp_low2);

show_temp(temp_high2);

show_temp(temp_crit2);

show_temp(temp_hyst2);

#define set_temp2(value, reg) \

static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \

        size_t count) \

{ \

        struct i2c_client *client = to_i2c_client(dev); \

        struct max1619_data *data = i2c_get_clientdata(client); \

        long val = simple_strtol(buf, NULL, 10); \

 \

        mutex_lock(&data->update_lock); \

        data->value = TEMP_TO_REG(val); \

        i2c_smbus_write_byte_data(client, reg, data->value); \

        mutex_unlock(&data->update_lock); \

        return count; \

}

set_temp2(temp_low2, MAX1619_REG_W_REMOTE_LOW);

set_temp2(temp_high2, MAX1619_REG_W_REMOTE_HIGH);

set_temp2(temp_crit2, MAX1619_REG_W_REMOTE_CRIT);

set_temp2(temp_hyst2, MAX1619_REG_W_TCRIT_HYST);

static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)

{

        struct max1619_data *data = max1619_update_device(dev);

        return sprintf(buf, "%d\n", data->alarms);

}

static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);

static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);

static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,

        set_temp_low2);

static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,

        set_temp_high2);

static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,

        set_temp_crit2);

static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst2,

        set_temp_hyst2);

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

static struct attribute *max1619_attributes[] = {

        &dev_attr_temp1_input.attr,

        &dev_attr_temp2_input.attr,

        &dev_attr_temp2_min.attr,

        &dev_attr_temp2_max.attr,

        &dev_attr_temp2_crit.attr,

        &dev_attr_temp2_crit_hyst.attr,

        &dev_attr_alarms.attr,

        NULL

};

static const struct attribute_group max1619_group = {

        .attrs = max1619_attributes,

};

/*

 * Real code

 */

static int max1619_attach_adapter(struct i2c_adapter *adapter)

{

        if (!(adapter->class & I2C_CLASS_HWMON))

                return 0;

        return i2c_probe(adapter, &addr_data, max1619_detect);

}

/*

 * The following function does more than just detection. If detection

 * succeeds, it also registers the new chip.

 */

static int max1619_detect(struct i2c_adapter *adapter, int address, int kind)

{

        struct i2c_client *new_client;

        struct max1619_data *data;

        int err = 0;

        const char *name = "";

        u8 reg_config=0, reg_convrate=0, reg_status=0;

        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

                goto exit;

        if (!(data = kzalloc(sizeof(struct max1619_data), GFP_KERNEL))) {

                err = -ENOMEM;

                goto exit;

        }

        /* The common I2C client data is placed right before the

           MAX1619-specific data. */

        new_client = &data->client;

        i2c_set_clientdata(new_client, data);

        new_client->addr = address;

        new_client->adapter = adapter;

        new_client->driver = &max1619_driver;

        new_client->flags = 0;

        /*

         * Now we do the remaining detection. A negative kind means that

         * the driver was loaded with no force parameter (default), so we

         * must both detect and identify the chip. A zero kind means that

         * the driver was loaded with the force parameter, the detection

         * step shall be skipped. A positive kind means that the driver

         * was loaded with the force parameter and a given kind of chip is

         * requested, so both the detection and the identification steps

         * are skipped.

         */

        if (kind < 0) { /* detection */

                reg_config = i2c_smbus_read_byte_data(new_client,

                              MAX1619_REG_R_CONFIG);

                reg_convrate = i2c_smbus_read_byte_data(new_client,

                               MAX1619_REG_R_CONVRATE);

                reg_status = i2c_smbus_read_byte_data(new_client,

                                MAX1619_REG_R_STATUS);

                if ((reg_config & 0x03) != 0x00

                 || reg_convrate > 0x07 || (reg_status & 0x61 ) !=0x00) {

                        dev_dbg(&adapter->dev,

                                "MAX1619 detection failed at 0x%02x.\n",

                                address);

                        goto exit_free;

                }

        }

        if (kind <= 0) { /* identification */

                u8 man_id, chip_id;

                man_id = i2c_smbus_read_byte_data(new_client,

                         MAX1619_REG_R_MAN_ID);

                chip_id = i2c_smbus_read_byte_data(new_client,

                          MAX1619_REG_R_CHIP_ID);

                if ((man_id == 0x4D) && (chip_id == 0x04))

                        kind = max1619;

                if (kind <= 0) { /* identification failed */

                        dev_info(&adapter->dev,

                            "Unsupported chip (man_id=0x%02X, "

                            "chip_id=0x%02X).\n", man_id, chip_id);

                        goto exit_free;

                }

        }

        if (kind == max1619)

                name = "max1619";

        /* We can fill in the remaining client fields */

        strlcpy(new_client->name, name, I2C_NAME_SIZE);

        data->valid = 0;

        mutex_init(&data->update_lock);

        /* Tell the I2C layer a new client has arrived */

        if ((err = i2c_attach_client(new_client)))

                goto exit_free;

        /* Initialize the MAX1619 chip */

        max1619_init_client(new_client);

        /* Register sysfs hooks */

        if ((err = sysfs_create_group(&new_client->dev.kobj, &max1619_group)))

                goto exit_detach;

        data->hwmon_dev = hwmon_device_register(&new_client->dev);

        if (IS_ERR(data->hwmon_dev)) {

                err = PTR_ERR(data->hwmon_dev);

                goto exit_remove_files;

        }

        return 0;

exit_remove_files:

        sysfs_remove_group(&new_client->dev.kobj, &max1619_group);

exit_detach:

        i2c_detach_client(new_client);

exit_free:

        kfree(data);

exit:

        return err;

}

static void max1619_init_client(struct i2c_client *client)

{

        u8 config;

        /*

         * Start the conversions.

         */

        i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONVRATE,

                                  5); /* 2 Hz */

        config = i2c_smbus_read_byte_data(client, MAX1619_REG_R_CONFIG);

        if (config & 0x40)

                i2c_smbus_write_byte_data(client, MAX1619_REG_W_CONFIG,

                                          config & 0xBF); /* run */

}

static int max1619_detach_client(struct i2c_client *client)

{

        struct max1619_data *data = i2c_get_clientdata(client);

        int err;

        hwmon_device_unregister(data->hwmon_dev);

        sysfs_remove_group(&client->dev.kobj, &max1619_group);

        if ((err = i2c_detach_client(client)))

                return err;

        kfree(data);

        return 0;

}

static struct max1619_data *max1619_update_device(struct device *dev)

{

        struct i2c_client *client = to_i2c_client(dev);

        struct max1619_data *data = i2c_get_clientdata(client);

        mutex_lock(&data->update_lock);

        if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {

                dev_dbg(&client->dev, "Updating max1619 data.\n");

                data->temp_input1 = i2c_smbus_read_byte_data(client,

                                        MAX1619_REG_R_LOCAL_TEMP);

                data->temp_input2 = i2c_smbus_read_byte_data(client,

                                        MAX1619_REG_R_REMOTE_TEMP);

                data->temp_high2 = i2c_smbus_read_byte_data(client,

                                        MAX1619_REG_R_REMOTE_HIGH);

                data->temp_low2 = i2c_smbus_read_byte_data(client,

                                        MAX1619_REG_R_REMOTE_LOW);

                data->temp_crit2 = i2c_smbus_read_byte_data(client,

                                        MAX1619_REG_R_REMOTE_CRIT);

                data->temp_hyst2 = i2c_smbus_read_byte_data(client,

                                        MAX1619_REG_R_TCRIT_HYST);

                data->alarms = i2c_smbus_read_byte_data(client,

                                        MAX1619_REG_R_STATUS);

                data->last_updated = jiffies;

                data->valid = 1;

        }

        mutex_unlock(&data->update_lock);

        return data;

}

static int __init sensors_max1619_init(void)

{

        return i2c_add_driver(&max1619_driver);

}

static void __exit sensors_max1619_exit(void)

{

        i2c_del_driver(&max1619_driver);

}

MODULE_AUTHOR("Alexey Fisher <fishor@mail.ru> and "

        "Jean Delvare <khali@linux-fr.org>");

MODULE_DESCRIPTION("MAX1619 sensor driver");

MODULE_LICENSE("GPL");

module_init(sensors_max1619_init);

module_exit(sensors_max1619_exit);