linux/drivers/mfd/ucb1x00-assabet.c
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   1/*
   2 *  linux/drivers/mfd/ucb1x00-assabet.c
   3 *
   4 *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License.
   9 *
  10 *  We handle the machine-specific bits of the UCB1x00 driver here.
  11 */
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/device.h>
  15#include <linux/err.h>
  16#include <linux/fs.h>
  17#include <linux/gpio_keys.h>
  18#include <linux/input.h>
  19#include <linux/platform_device.h>
  20#include <linux/proc_fs.h>
  21#include <linux/mfd/ucb1x00.h>
  22
  23#define UCB1X00_ATTR(name,input)\
  24static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
  25                           char *buf)   \
  26{                                                               \
  27        struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
  28        int val;                                                \
  29        ucb1x00_adc_enable(ucb);                                \
  30        val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
  31        ucb1x00_adc_disable(ucb);                               \
  32        return sprintf(buf, "%d\n", val);                       \
  33}                                                               \
  34static DEVICE_ATTR(name,0444,name##_show,NULL)
  35
  36UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
  37UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
  38UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
  39
  40static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
  41{
  42        struct ucb1x00 *ucb = dev->ucb;
  43        struct platform_device *pdev;
  44        struct gpio_keys_platform_data keys;
  45        static struct gpio_keys_button buttons[6];
  46        unsigned i;
  47
  48        memset(buttons, 0, sizeof(buttons));
  49        memset(&keys, 0, sizeof(keys));
  50
  51        for (i = 0; i < ARRAY_SIZE(buttons); i++) {
  52                buttons[i].code = BTN_0 + i;
  53                buttons[i].gpio = ucb->gpio.base + i;
  54                buttons[i].type = EV_KEY;
  55                buttons[i].can_disable = true;
  56        }
  57
  58        keys.buttons = buttons;
  59        keys.nbuttons = ARRAY_SIZE(buttons);
  60        keys.poll_interval = 50;
  61        keys.name = "ucb1x00";
  62
  63        pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
  64                &keys, sizeof(keys));
  65
  66        device_create_file(&ucb->dev, &dev_attr_vbatt);
  67        device_create_file(&ucb->dev, &dev_attr_vcharger);
  68        device_create_file(&ucb->dev, &dev_attr_batt_temp);
  69
  70        dev->priv = pdev;
  71        return 0;
  72}
  73
  74static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
  75{
  76        struct platform_device *pdev = dev->priv;
  77
  78        if (!IS_ERR(pdev))
  79                platform_device_unregister(pdev);
  80
  81        device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
  82        device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
  83        device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
  84}
  85
  86static struct ucb1x00_driver ucb1x00_assabet_driver = {
  87        .add    = ucb1x00_assabet_add,
  88        .remove = ucb1x00_assabet_remove,
  89};
  90
  91static int __init ucb1x00_assabet_init(void)
  92{
  93        return ucb1x00_register_driver(&ucb1x00_assabet_driver);
  94}
  95
  96static void __exit ucb1x00_assabet_exit(void)
  97{
  98        ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
  99}
 100
 101module_init(ucb1x00_assabet_init);
 102module_exit(ucb1x00_assabet_exit);
 103
 104MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 105MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
 106MODULE_LICENSE("GPL");
 107
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