LXR linux/drivers/mfd/ucb1x00-assabet.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/drivers/mfd/ucb1x00-assabet.c
   4 *
   5 *  Copyright (C) 2001-2003 Russell King, All Rights Reserved.
   6 *
   7 *  We handle the machine-specific bits of the UCB1x00 driver here.
   8 */
   9#include <linux/module.h>
  10#include <linux/init.h>
  11#include <linux/device.h>
  12#include <linux/err.h>
  13#include <linux/fs.h>
  14#include <linux/gpio_keys.h>
  15#include <linux/input.h>
  16#include <linux/platform_device.h>
  17#include <linux/proc_fs.h>
  18#include <linux/mfd/ucb1x00.h>
  19
  20#define UCB1X00_ATTR(name,input)\
  21static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
  22                           char *buf)   \
  23{                                                               \
  24        struct ucb1x00 *ucb = classdev_to_ucb1x00(dev);         \
  25        int val;                                                \
  26        ucb1x00_adc_enable(ucb);                                \
  27        val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC);         \
  28        ucb1x00_adc_disable(ucb);                               \
  29        return sprintf(buf, "%d\n", val);                       \
  30}                                                               \
  31static DEVICE_ATTR_RO(name)
  32
  33UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
  34UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
  35UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
  36
  37static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
  38{
  39        struct ucb1x00 *ucb = dev->ucb;
  40        struct platform_device *pdev;
  41        struct gpio_keys_platform_data keys;
  42        static struct gpio_keys_button buttons[6];
  43        unsigned i;
  44
  45        memset(buttons, 0, sizeof(buttons));
  46        memset(&keys, 0, sizeof(keys));
  47
  48        for (i = 0; i < ARRAY_SIZE(buttons); i++) {
  49                buttons[i].code = BTN_0 + i;
  50                buttons[i].gpio = ucb->gpio.base + i;
  51                buttons[i].type = EV_KEY;
  52                buttons[i].can_disable = true;
  53        }
  54
  55        keys.buttons = buttons;
  56        keys.nbuttons = ARRAY_SIZE(buttons);
  57        keys.poll_interval = 50;
  58        keys.name = "ucb1x00";
  59
  60        pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
  61                &keys, sizeof(keys));
  62
  63        device_create_file(&ucb->dev, &dev_attr_vbatt);
  64        device_create_file(&ucb->dev, &dev_attr_vcharger);
  65        device_create_file(&ucb->dev, &dev_attr_batt_temp);
  66
  67        dev->priv = pdev;
  68        return 0;
  69}
  70
  71static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
  72{
  73        struct platform_device *pdev = dev->priv;
  74
  75        if (!IS_ERR(pdev))
  76                platform_device_unregister(pdev);
  77
  78        device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
  79        device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
  80        device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
  81}
  82
  83static struct ucb1x00_driver ucb1x00_assabet_driver = {
  84        .add    = ucb1x00_assabet_add,
  85        .remove = ucb1x00_assabet_remove,
  86};
  87
  88static int __init ucb1x00_assabet_init(void)
  89{
  90        return ucb1x00_register_driver(&ucb1x00_assabet_driver);
  91}
  92
  93static void __exit ucb1x00_assabet_exit(void)
  94{
  95        ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
  96}
  97
  98module_init(ucb1x00_assabet_init);
  99module_exit(ucb1x00_assabet_exit);
 100
 101MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 102MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
 103MODULE_LICENSE("GPL");
 104