ab8500-sysctrl.c

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/*
 * Copyright (C) ST-Ericsson SA 2010
 * Author: Mattias Nilsson <[email protected]> for ST Ericsson.
 * License terms: GNU General Public License (GPL) version 2
 */

#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ab8500-sysctrl.h>

static struct device *sysctrl_dev;

static inline bool valid_bank(u8 bank)
{
    return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
        (bank == AB8500_SYS_CTRL2_BLOCK));
}

int ab8500_sysctrl_read(u16 reg, u8 *value)
{
    u8 bank;

    if (sysctrl_dev == NULL)
        return -EAGAIN;

    bank = (reg >> 8);
    if (!valid_bank(bank))
        return -EINVAL;

    return abx500_get_register_interruptible(sysctrl_dev, bank,
        (u8)(reg & 0xFF), value);
}

int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
{
    u8 bank;

    if (sysctrl_dev == NULL)
        return -EAGAIN;

    bank = (reg >> 8);
    if (!valid_bank(bank))
        return -EINVAL;

    return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
        (u8)(reg & 0xFF), mask, value);
}

static int __devinit ab8500_sysctrl_probe(struct platform_device *pdev)
{
    sysctrl_dev = &pdev->dev;
    return 0;
}

static int __devexit ab8500_sysctrl_remove(struct platform_device *pdev)
{
    sysctrl_dev = NULL;
    return 0;
}

static struct platform_driver ab8500_sysctrl_driver = {
    .driver = {
        .name = "ab8500-sysctrl",
        .owner = THIS_MODULE,
    },
    .probe = ab8500_sysctrl_probe,
    .remove = __devexit_p(ab8500_sysctrl_remove),
};

static int __init ab8500_sysctrl_init(void)
{
    return platform_driver_register(&ab8500_sysctrl_driver);
}
subsys_initcall(ab8500_sysctrl_init);

MODULE_AUTHOR("Mattias Nilsson <[email protected]");
MODULE_DESCRIPTION("AB8500 system control driver");
MODULE_LICENSE("GPL v2");