w1_bq27000.c

Go to the documentation of this file.

/*
 * drivers/w1/slaves/w1_bq27000.c
 *
 * Copyright (C) 2007 Texas Instruments, Inc.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/power/bq27x00_battery.h>

#include "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"

#define HDQ_CMD_READ    (0)
#define HDQ_CMD_WRITE   (1<<7)

static int F_ID;

static int w1_bq27000_read(struct device *dev, unsigned int reg)
{
    u8 val;
    struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);

    mutex_lock(&sl->master->bus_mutex);
    w1_write_8(sl->master, HDQ_CMD_READ | reg);
    val = w1_read_8(sl->master);
    mutex_unlock(&sl->master->bus_mutex);

    return val;
}

static struct bq27000_platform_data bq27000_battery_info = {
    .read   = w1_bq27000_read,
    .name   = "bq27000-battery",
};

static int w1_bq27000_add_slave(struct w1_slave *sl)
{
    int ret;
    struct platform_device *pdev;

    pdev = platform_device_alloc("bq27000-battery", -1);
    if (!pdev) {
        ret = -ENOMEM;
        return ret;
    }
    ret = platform_device_add_data(pdev,
                       &bq27000_battery_info,
                       sizeof(bq27000_battery_info));
    pdev->dev.parent = &sl->dev;

    ret = platform_device_add(pdev);
    if (ret)
        goto pdev_add_failed;

    dev_set_drvdata(&sl->dev, pdev);

    goto success;

pdev_add_failed:
    platform_device_unregister(pdev);
success:
    return ret;
}

static void w1_bq27000_remove_slave(struct w1_slave *sl)
{
    struct platform_device *pdev = dev_get_drvdata(&sl->dev);

    platform_device_unregister(pdev);
}

static struct w1_family_ops w1_bq27000_fops = {
    .add_slave  = w1_bq27000_add_slave,
    .remove_slave   = w1_bq27000_remove_slave,
};

static struct w1_family w1_bq27000_family = {
    .fid = 1,
    .fops = &w1_bq27000_fops,
};

static int __init w1_bq27000_init(void)
{
    if (F_ID)
        w1_bq27000_family.fid = F_ID;

    return w1_register_family(&w1_bq27000_family);
}

static void __exit w1_bq27000_exit(void)
{
    w1_unregister_family(&w1_bq27000_family);
}


module_init(w1_bq27000_init);
module_exit(w1_bq27000_exit);

module_param(F_ID, int, S_IRUSR);
MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Texas Instruments Ltd");
MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");