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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * linux/drivers/mfd/ucb1x00-assabet.c4 *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