ucb1x00-assabet.c

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/*
 *  linux/drivers/mfd/ucb1x00-assabet.c
 *
 *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License.
 *
 *  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(name,0444,name##_show,NULL)

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 <[email protected]>");
MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
MODULE_LICENSE("GPL");