88pm80x.c

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/*
 * I2C driver for Marvell 88PM80x
 *
 * Copyright (C) 2012 Marvell International Ltd.
 * Haojian Zhuang <[email protected]>
 * Joseph(Yossi) Hanin <[email protected]>
 * Qiao Zhou <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/mfd/88pm80x.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/err.h>

/*
 * workaround: some registers needed by pm805 are defined in pm800, so
 * need to use this global variable to maintain the relation between
 * pm800 and pm805. would remove it after HW chip fixes the issue.
 */
static struct pm80x_chip *g_pm80x_chip;

const struct regmap_config pm80x_regmap_config = {
    .reg_bits = 8,
    .val_bits = 8,
};
EXPORT_SYMBOL_GPL(pm80x_regmap_config);

int __devinit pm80x_init(struct i2c_client *client,
                 const struct i2c_device_id *id)
{
    struct pm80x_chip *chip;
    struct regmap *map;
    int ret = 0;

    chip =
        devm_kzalloc(&client->dev, sizeof(struct pm80x_chip), GFP_KERNEL);
    if (!chip)
        return -ENOMEM;

    map = devm_regmap_init_i2c(client, &pm80x_regmap_config);
    if (IS_ERR(map)) {
        ret = PTR_ERR(map);
        dev_err(&client->dev, "Failed to allocate register map: %d\n",
            ret);
        goto err_regmap_init;
    }

    chip->id = id->driver_data;
    if (chip->id < CHIP_PM800 || chip->id > CHIP_PM805) {
        ret = -EINVAL;
        goto err_chip_id;
    }

    chip->client = client;
    chip->regmap = map;

    chip->irq = client->irq;

    chip->dev = &client->dev;
    dev_set_drvdata(chip->dev, chip);
    i2c_set_clientdata(chip->client, chip);

    device_init_wakeup(&client->dev, 1);

    /*
     * workaround: set g_pm80x_chip to the first probed chip. if the
     * second chip is probed, just point to the companion to each
     * other so that pm805 can access those specific register. would
     * remove it after HW chip fixes the issue.
     */
    if (!g_pm80x_chip)
        g_pm80x_chip = chip;
    else {
        chip->companion = g_pm80x_chip->client;
        g_pm80x_chip->companion = chip->client;
    }

    return 0;

err_chip_id:
    regmap_exit(map);
err_regmap_init:
    devm_kfree(&client->dev, chip);
    return ret;
}
EXPORT_SYMBOL_GPL(pm80x_init);

int pm80x_deinit(struct i2c_client *client)
{
    struct pm80x_chip *chip = i2c_get_clientdata(client);

    /*
     * workaround: clear the dependency between pm800 and pm805.
     * would remove it after HW chip fixes the issue.
     */
    if (g_pm80x_chip->companion)
        g_pm80x_chip->companion = NULL;
    else
        g_pm80x_chip = NULL;

    regmap_exit(chip->regmap);
    devm_kfree(&client->dev, chip);

    return 0;
}
EXPORT_SYMBOL_GPL(pm80x_deinit);

#ifdef CONFIG_PM_SLEEP
static int pm80x_suspend(struct device *dev)
{
    struct i2c_client *client = container_of(dev, struct i2c_client, dev);
    struct pm80x_chip *chip = i2c_get_clientdata(client);

    if (chip && chip->wu_flag)
        if (device_may_wakeup(chip->dev))
            enable_irq_wake(chip->irq);

    return 0;
}

static int pm80x_resume(struct device *dev)
{
    struct i2c_client *client = container_of(dev, struct i2c_client, dev);
    struct pm80x_chip *chip = i2c_get_clientdata(client);

    if (chip && chip->wu_flag)
        if (device_may_wakeup(chip->dev))
            disable_irq_wake(chip->irq);

    return 0;
}
#endif

SIMPLE_DEV_PM_OPS(pm80x_pm_ops, pm80x_suspend, pm80x_resume);
EXPORT_SYMBOL_GPL(pm80x_pm_ops);

MODULE_DESCRIPTION("I2C Driver for Marvell 88PM80x");
MODULE_AUTHOR("Qiao Zhou <[email protected]>");
MODULE_LICENSE("GPL");