// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/drivers/mfd/ucb1x00-assabet.c
 *
 *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
 *
 *  We handle the machine-specific bits of the UCB1x00 driver here.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/gpio_keys.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/proc_fs.h>
#include <linux/mfd/ucb1x00.h>

#define UCB1X00_ATTR(name,input)\
static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
                           char *buf)   \
{                                                               \
        struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
        int val;                                                \
        ucb1x00_adc_enable(ucb);                                \
        val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
        ucb1x00_adc_disable(ucb);                               \
        return sprintf(buf, "%d\n", val);                       \
}                                                               \
static DEVICE_ATTR_RO(name)

UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);

static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
{
        struct ucb1x00 *ucb = dev->ucb;
        struct platform_device *pdev;
        struct gpio_keys_platform_data keys;
        static struct gpio_keys_button buttons[6];
        unsigned i;

        memset(buttons, 0, sizeof(buttons));
        memset(&keys, 0, sizeof(keys));

        for (i = 0; i < ARRAY_SIZE(buttons); i++) {
                buttons[i].code = BTN_0 + i;
                buttons[i].gpio = ucb->gpio.base + i;
                buttons[i].type = EV_KEY;
                buttons[i].can_disable = true;
        }

        keys.buttons = buttons;
        keys.nbuttons = ARRAY_SIZE(buttons);
        keys.poll_interval = 50;
        keys.name = "ucb1x00";

        pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
                &keys, sizeof(keys));

        device_create_file(&ucb->dev, &dev_attr_vbatt);
        device_create_file(&ucb->dev, &dev_attr_vcharger);
        device_create_file(&ucb->dev, &dev_attr_batt_temp);

        dev->priv = pdev;
        return 0;
}

static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
{
        struct platform_device *pdev = dev->priv;

        if (!IS_ERR(pdev))
                platform_device_unregister(pdev);

        device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
        device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
        device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
}

static struct ucb1x00_driver ucb1x00_assabet_driver = {
        .add    = ucb1x00_assabet_add,
        .remove = ucb1x00_assabet_remove,
};

static int __init ucb1x00_assabet_init(void)
{
        return ucb1x00_register_driver(&ucb1x00_assabet_driver);
}

static void __exit ucb1x00_assabet_exit(void)
{
        ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
}

module_init(ucb1x00_assabet_init);
module_exit(ucb1x00_assabet_exit);

MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
MODULE_LICENSE("GPL");