165 lines
3.5 KiB
C
165 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
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* Copyright 2019 NXP
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*/
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/*
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* max17135.c
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*
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* Based on the MAX1619 driver.
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* Copyright (C) 2003-2004 Alexey Fisher <fishor@mail.ru>
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* Jean Delvare <khali@linux-fr.org>
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*
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* The MAX17135 is a sensor chip made by Maxim.
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* It reports up to two temperatures (its own plus up to
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* one external one).
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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/slab.h>
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#include <linux/jiffies.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/sysfs.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/max17135.h>
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#include <linux/mod_devicetable.h>
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/*
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* Conversions
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*/
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static int temp_from_reg(int val)
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{
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return val >> 8;
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}
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/*
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* Functions declaration
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*/
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static int max17135_sensor_probe(struct platform_device *pdev);
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static int max17135_sensor_remove(struct platform_device *pdev);
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static const struct platform_device_id max17135_sns_id[] = {
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{ "max17135-sns", 0},
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(platform, max17135_sns_id);
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/*
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* Driver data (common to all clients)
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*/
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static struct platform_driver max17135_sensor_driver = {
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.probe = max17135_sensor_probe,
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.remove = max17135_sensor_remove,
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.id_table = max17135_sns_id,
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.driver = {
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.name = "max17135_sensor",
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},
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};
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/*
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* Client data (each client gets its own)
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*/
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struct max17135_data {
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struct device *hwmon_dev;
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};
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/*
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* Sysfs stuff
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*/
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static ssize_t show_temp_input1(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned int reg_val;
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max17135_reg_read(REG_MAX17135_INT_TEMP, ®_val);
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return snprintf(buf, PAGE_SIZE, "%d\n", temp_from_reg(reg_val));
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}
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static ssize_t show_temp_input2(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned int reg_val;
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max17135_reg_read(REG_MAX17135_EXT_TEMP, ®_val);
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return snprintf(buf, PAGE_SIZE, "%d\n", temp_from_reg(reg_val));
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}
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static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
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static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
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static struct attribute *max17135_attributes[] = {
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&dev_attr_temp1_input.attr,
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&dev_attr_temp2_input.attr,
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NULL
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};
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static const struct attribute_group max17135_group = {
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.attrs = max17135_attributes,
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};
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/*
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* Real code
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*/
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static int max17135_sensor_probe(struct platform_device *pdev)
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{
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struct max17135_data *data;
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int err;
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data = kzalloc(sizeof(struct max17135_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto exit;
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}
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/* Register sysfs hooks */
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err = sysfs_create_group(&pdev->dev.kobj, &max17135_group);
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if (err)
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goto exit_free;
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto exit_remove_files;
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}
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platform_set_drvdata(pdev, data);
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return 0;
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exit_remove_files:
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sysfs_remove_group(&pdev->dev.kobj, &max17135_group);
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exit_free:
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kfree(data);
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exit:
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return err;
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}
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static int max17135_sensor_remove(struct platform_device *pdev)
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{
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struct max17135_data *data = platform_get_drvdata(pdev);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&pdev->dev.kobj, &max17135_group);
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kfree(data);
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return 0;
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}
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static int __init sensors_max17135_init(void)
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{
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return platform_driver_register(&max17135_sensor_driver);
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}
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module_init(sensors_max17135_init);
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static void __exit sensors_max17135_exit(void)
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{
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platform_driver_unregister(&max17135_sensor_driver);
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}
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module_exit(sensors_max17135_exit);
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MODULE_DESCRIPTION("MAX17135 sensor driver");
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MODULE_LICENSE("GPL");
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