adt7316-i2c.c

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/*
 * I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature
 * sensor, ADC and DAC
 *
 * Copyright 2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>

#include "adt7316.h"

/*
 * adt7316 register access by I2C
 */
static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
{
    struct i2c_client *cl = client;
    int ret = 0;

    ret = i2c_smbus_write_byte(cl, reg);
    if (ret < 0) {
        dev_err(&cl->dev, "I2C fail to select reg\n");
        return ret;
    }

    ret = i2c_smbus_read_byte(client);
    if (ret < 0) {
        dev_err(&cl->dev, "I2C read error\n");
        return ret;
    }

    return 0;
}

static int adt7316_i2c_write(void *client, u8 reg, u8 data)
{
    struct i2c_client *cl = client;
    int ret = 0;

    ret = i2c_smbus_write_byte_data(cl, reg, data);
    if (ret < 0)
        dev_err(&cl->dev, "I2C write error\n");

    return ret;
}

static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
{
    struct i2c_client *cl = client;
    int i, ret = 0;

    if (count > ADT7316_REG_MAX_ADDR)
        count = ADT7316_REG_MAX_ADDR;

    for (i = 0; i < count; i++) {
        ret = adt7316_i2c_read(cl, reg, &data[i]);
        if (ret < 0) {
            dev_err(&cl->dev, "I2C multi read error\n");
            return ret;
        }
    }

    return 0;
}

static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
{
    struct i2c_client *cl = client;
    int i, ret = 0;

    if (count > ADT7316_REG_MAX_ADDR)
        count = ADT7316_REG_MAX_ADDR;

    for (i = 0; i < count; i++) {
        ret = adt7316_i2c_write(cl, reg, data[i]);
        if (ret < 0) {
            dev_err(&cl->dev, "I2C multi write error\n");
            return ret;
        }
    }

    return 0;
}

/*
 * device probe and remove
 */

static int __devinit adt7316_i2c_probe(struct i2c_client *client,
        const struct i2c_device_id *id)
{
    struct adt7316_bus bus = {
        .client = client,
        .irq = client->irq,
        .irq_flags = IRQF_TRIGGER_LOW,
        .read = adt7316_i2c_read,
        .write = adt7316_i2c_write,
        .multi_read = adt7316_i2c_multi_read,
        .multi_write = adt7316_i2c_multi_write,
    };

    return adt7316_probe(&client->dev, &bus, id->name);
}

static int __devexit adt7316_i2c_remove(struct i2c_client *client)
{
    return adt7316_remove(&client->dev);
}

static const struct i2c_device_id adt7316_i2c_id[] = {
    { "adt7316", 0 },
    { "adt7317", 0 },
    { "adt7318", 0 },
    { "adt7516", 0 },
    { "adt7517", 0 },
    { "adt7519", 0 },
    { }
};

MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);

static struct i2c_driver adt7316_driver = {
    .driver = {
        .name = "adt7316",
        .pm = ADT7316_PM_OPS,
        .owner  = THIS_MODULE,
    },
    .probe = adt7316_i2c_probe,
    .remove = __devexit_p(adt7316_i2c_remove),
    .id_table = adt7316_i2c_id,
};
module_i2c_driver(adt7316_driver);

MODULE_AUTHOR("Sonic Zhang <[email protected]>");
MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and"
            "ADT7516/7/8 digital temperature sensor, ADC and DAC");
MODULE_LICENSE("GPL v2");