adp5520-keys.c

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/*
 * Keypad driver for Analog Devices ADP5520 MFD PMICs
 *
 * Copyright 2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/mfd/adp5520.h>
#include <linux/slab.h>

struct adp5520_keys {
    struct input_dev *input;
    struct notifier_block notifier;
    struct device *master;
    unsigned short keycode[ADP5520_KEYMAPSIZE];
};

static void adp5520_keys_report_event(struct adp5520_keys *dev,
                    unsigned short keymask, int value)
{
    int i;

    for (i = 0; i < ADP5520_MAXKEYS; i++)
        if (keymask & (1 << i))
            input_report_key(dev->input, dev->keycode[i], value);

    input_sync(dev->input);
}

static int adp5520_keys_notifier(struct notifier_block *nb,
                 unsigned long event, void *data)
{
    struct adp5520_keys *dev;
    uint8_t reg_val_lo, reg_val_hi;
    unsigned short keymask;

    dev = container_of(nb, struct adp5520_keys, notifier);

    if (event & ADP5520_KP_INT) {
        adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
        adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);

        keymask = (reg_val_hi << 8) | reg_val_lo;
        /* Read twice to clear */
        adp5520_read(dev->master, ADP5520_KP_INT_STAT_1, &reg_val_lo);
        adp5520_read(dev->master, ADP5520_KP_INT_STAT_2, &reg_val_hi);
        keymask |= (reg_val_hi << 8) | reg_val_lo;
        adp5520_keys_report_event(dev, keymask, 1);
    }

    if (event & ADP5520_KR_INT) {
        adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
        adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);

        keymask = (reg_val_hi << 8) | reg_val_lo;
        /* Read twice to clear */
        adp5520_read(dev->master, ADP5520_KR_INT_STAT_1, &reg_val_lo);
        adp5520_read(dev->master, ADP5520_KR_INT_STAT_2, &reg_val_hi);
        keymask |= (reg_val_hi << 8) | reg_val_lo;
        adp5520_keys_report_event(dev, keymask, 0);
    }

    return 0;
}

static int __devinit adp5520_keys_probe(struct platform_device *pdev)
{
    struct adp5520_keys_platform_data *pdata = pdev->dev.platform_data;
    struct input_dev *input;
    struct adp5520_keys *dev;
    int ret, i;
    unsigned char en_mask, ctl_mask = 0;

    if (pdev->id != ID_ADP5520) {
        dev_err(&pdev->dev, "only ADP5520 supports Keypad\n");
        return -EINVAL;
    }

    if (pdata == NULL) {
        dev_err(&pdev->dev, "missing platform data\n");
        return -EINVAL;
    }

    if (!(pdata->rows_en_mask && pdata->cols_en_mask))
        return -EINVAL;

    dev = kzalloc(sizeof(*dev), GFP_KERNEL);
    if (dev == NULL) {
        dev_err(&pdev->dev, "failed to alloc memory\n");
        return -ENOMEM;
    }

    input = input_allocate_device();
    if (!input) {
        ret = -ENOMEM;
        goto err;
    }

    dev->master = pdev->dev.parent;
    dev->input = input;

    input->name = pdev->name;
    input->phys = "adp5520-keys/input0";
    input->dev.parent = &pdev->dev;

    input_set_drvdata(input, dev);

    input->id.bustype = BUS_I2C;
    input->id.vendor = 0x0001;
    input->id.product = 0x5520;
    input->id.version = 0x0001;

    input->keycodesize = sizeof(dev->keycode[0]);
    input->keycodemax = pdata->keymapsize;
    input->keycode = dev->keycode;

    memcpy(dev->keycode, pdata->keymap,
        pdata->keymapsize * input->keycodesize);

    /* setup input device */
    __set_bit(EV_KEY, input->evbit);

    if (pdata->repeat)
        __set_bit(EV_REP, input->evbit);

    for (i = 0; i < input->keycodemax; i++)
        __set_bit(dev->keycode[i], input->keybit);
    __clear_bit(KEY_RESERVED, input->keybit);

    ret = input_register_device(input);
    if (ret) {
        dev_err(&pdev->dev, "unable to register input device\n");
        goto err;
    }

    en_mask = pdata->rows_en_mask | pdata->cols_en_mask;

    ret = adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_1, en_mask);

    if (en_mask & ADP5520_COL_C3)
        ctl_mask |= ADP5520_C3_MODE;

    if (en_mask & ADP5520_ROW_R3)
        ctl_mask |= ADP5520_R3_MODE;

    if (ctl_mask)
        ret |= adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
            ctl_mask);

    ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
        pdata->rows_en_mask);

    if (ret) {
        dev_err(&pdev->dev, "failed to write\n");
        ret = -EIO;
        goto err1;
    }

    dev->notifier.notifier_call = adp5520_keys_notifier;
    ret = adp5520_register_notifier(dev->master, &dev->notifier,
            ADP5520_KP_IEN | ADP5520_KR_IEN);
    if (ret) {
        dev_err(&pdev->dev, "failed to register notifier\n");
        goto err1;
    }

    platform_set_drvdata(pdev, dev);
    return 0;

err1:
    input_unregister_device(input);
    input = NULL;
err:
    input_free_device(input);
    kfree(dev);
    return ret;
}

static int __devexit adp5520_keys_remove(struct platform_device *pdev)
{
    struct adp5520_keys *dev = platform_get_drvdata(pdev);

    adp5520_unregister_notifier(dev->master, &dev->notifier,
                ADP5520_KP_IEN | ADP5520_KR_IEN);

    input_unregister_device(dev->input);
    kfree(dev);
    return 0;
}

static struct platform_driver adp5520_keys_driver = {
    .driver = {
        .name   = "adp5520-keys",
        .owner  = THIS_MODULE,
    },
    .probe      = adp5520_keys_probe,
    .remove     = __devexit_p(adp5520_keys_remove),
};
module_platform_driver(adp5520_keys_driver);

MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("Keys ADP5520 Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:adp5520-keys");