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47ed390bac
Use DEVICE_ATTR_RO macro helper instead of plain DEVICE_ATTR, which makes the code a bit shorter and easier to read. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/mfd/ucb1x00-assabet.c
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*
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* Copyright (C) 2001-2003 Russell King, All Rights Reserved.
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*
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* We handle the machine-specific bits of the UCB1x00 driver here.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/gpio_keys.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/proc_fs.h>
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#include <linux/mfd/ucb1x00.h>
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#define UCB1X00_ATTR(name,input)\
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static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
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char *buf) \
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{ \
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struct ucb1x00 *ucb = classdev_to_ucb1x00(dev); \
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int val; \
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ucb1x00_adc_enable(ucb); \
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val = ucb1x00_adc_read(ucb, input, UCB_NOSYNC); \
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ucb1x00_adc_disable(ucb); \
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return sprintf(buf, "%d\n", val); \
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} \
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static DEVICE_ATTR_RO(name)
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UCB1X00_ATTR(vbatt, UCB_ADC_INP_AD1);
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UCB1X00_ATTR(vcharger, UCB_ADC_INP_AD0);
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UCB1X00_ATTR(batt_temp, UCB_ADC_INP_AD2);
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static int ucb1x00_assabet_add(struct ucb1x00_dev *dev)
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{
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struct ucb1x00 *ucb = dev->ucb;
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struct platform_device *pdev;
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struct gpio_keys_platform_data keys;
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static struct gpio_keys_button buttons[6];
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unsigned i;
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memset(buttons, 0, sizeof(buttons));
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memset(&keys, 0, sizeof(keys));
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for (i = 0; i < ARRAY_SIZE(buttons); i++) {
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buttons[i].code = BTN_0 + i;
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buttons[i].gpio = ucb->gpio.base + i;
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buttons[i].type = EV_KEY;
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buttons[i].can_disable = true;
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}
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keys.buttons = buttons;
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keys.nbuttons = ARRAY_SIZE(buttons);
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keys.poll_interval = 50;
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keys.name = "ucb1x00";
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pdev = platform_device_register_data(&ucb->dev, "gpio-keys", -1,
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&keys, sizeof(keys));
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device_create_file(&ucb->dev, &dev_attr_vbatt);
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device_create_file(&ucb->dev, &dev_attr_vcharger);
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device_create_file(&ucb->dev, &dev_attr_batt_temp);
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dev->priv = pdev;
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return 0;
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}
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static void ucb1x00_assabet_remove(struct ucb1x00_dev *dev)
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{
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struct platform_device *pdev = dev->priv;
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if (!IS_ERR(pdev))
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platform_device_unregister(pdev);
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device_remove_file(&dev->ucb->dev, &dev_attr_batt_temp);
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device_remove_file(&dev->ucb->dev, &dev_attr_vcharger);
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device_remove_file(&dev->ucb->dev, &dev_attr_vbatt);
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}
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static struct ucb1x00_driver ucb1x00_assabet_driver = {
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.add = ucb1x00_assabet_add,
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.remove = ucb1x00_assabet_remove,
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};
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static int __init ucb1x00_assabet_init(void)
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{
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return ucb1x00_register_driver(&ucb1x00_assabet_driver);
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}
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static void __exit ucb1x00_assabet_exit(void)
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{
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ucb1x00_unregister_driver(&ucb1x00_assabet_driver);
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}
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module_init(ucb1x00_assabet_init);
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module_exit(ucb1x00_assabet_exit);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("Assabet noddy testing only example ADC driver");
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MODULE_LICENSE("GPL");
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