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linux-next/drivers/hwmon/da9052-hwmon.c
Anthony Olech c09088d934 hwmon: (da9052) Fix adc to voltage calculation 
The ADC resolution of the PMIC is 10-bits, this means that the maximum
possible value is 1023 and not the 1024 as originally in the code.

Signed-off-by: Anthony Olech <anthony.olech.opensource@diasemi.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2014-01-14 21:36:31 -08:00

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/*
* HWMON Driver for Dialog DA9052
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mfd/da9052/da9052.h>
#include <linux/mfd/da9052/reg.h>
struct da9052_hwmon {
struct da9052 *da9052;
struct device *class_device;
struct mutex hwmon_lock;
};
static const char * const input_names[] = {
[DA9052_ADC_VDDOUT] = "VDDOUT",
[DA9052_ADC_ICH] = "CHARGING CURRENT",
[DA9052_ADC_TBAT] = "BATTERY TEMP",
[DA9052_ADC_VBAT] = "BATTERY VOLTAGE",
[DA9052_ADC_IN4] = "ADC IN4",
[DA9052_ADC_IN5] = "ADC IN5",
[DA9052_ADC_IN6] = "ADC IN6",
[DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP",
[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
};
/* Conversion function for VDDOUT and VBAT */
static inline int volt_reg_to_mv(int value)
{
return DIV_ROUND_CLOSEST(value * 2000, 1023) + 2500;
}
/* Conversion function for ADC channels 4, 5 and 6 */
static inline int input_reg_to_mv(int value)
{
return DIV_ROUND_CLOSEST(value * 2500, 1023);
}
/* Conversion function for VBBAT */
static inline int vbbat_reg_to_mv(int value)
{
return DIV_ROUND_CLOSEST(value * 5000, 1023);
}
static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
{
return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
DA9052_ADCCONT_AUTOVDDEN,
DA9052_ADCCONT_AUTOVDDEN);
}
static inline int da9052_disable_vddout_channel(struct da9052 *da9052)
{
return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
DA9052_ADCCONT_AUTOVDDEN, 0);
}
static ssize_t da9052_read_vddout(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int ret, vdd;
mutex_lock(&hwmon->hwmon_lock);
ret = da9052_enable_vddout_channel(hwmon->da9052);
if (ret < 0)
goto hwmon_err;
vdd = da9052_reg_read(hwmon->da9052, DA9052_VDD_RES_REG);
if (vdd < 0) {
ret = vdd;
goto hwmon_err_release;
}
ret = da9052_disable_vddout_channel(hwmon->da9052);
if (ret < 0)
goto hwmon_err;
mutex_unlock(&hwmon->hwmon_lock);
return sprintf(buf, "%d\n", volt_reg_to_mv(vdd));
hwmon_err_release:
da9052_disable_vddout_channel(hwmon->da9052);
hwmon_err:
mutex_unlock(&hwmon->hwmon_lock);
return ret;
}
static ssize_t da9052_read_ich(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int ret;
ret = da9052_reg_read(hwmon->da9052, DA9052_ICHG_AV_REG);
if (ret < 0)
return ret;
/* Equivalent to 3.9mA/bit in register ICHG_AV */
return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
}
static ssize_t da9052_read_tbat(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", da9052_adc_read_temp(hwmon->da9052));
}
static ssize_t da9052_read_vbat(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int ret;
ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBAT);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", volt_reg_to_mv(ret));
}
static ssize_t da9052_read_misc_channel(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int channel = to_sensor_dev_attr(devattr)->index;
int ret;
ret = da9052_adc_manual_read(hwmon->da9052, channel);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", input_reg_to_mv(ret));
}
static ssize_t da9052_read_tjunc(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int tjunc;
int toffset;
tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
if (tjunc < 0)
return tjunc;
toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
if (toffset < 0)
return toffset;
/*
* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8
* T_OFFSET is a trim value used to improve accuracy of the result
*/
return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
}
static ssize_t da9052_read_vbbat(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int ret;
ret = da9052_adc_manual_read(hwmon->da9052, DA9052_ADC_VBBAT);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", vbbat_reg_to_mv(ret));
}
static ssize_t da9052_hwmon_show_name(struct device *dev,
struct device_attribute *devattr,
char *buf)
{
return sprintf(buf, "da9052-hwmon\n");
}
static ssize_t show_label(struct device *dev,
struct device_attribute *devattr, char *buf)
{
return sprintf(buf, "%s\n",
input_names[to_sensor_dev_attr(devattr)->index]);
}
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
DA9052_ADC_VDDOUT);
static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
DA9052_ADC_VDDOUT);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
DA9052_ADC_VBAT);
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
DA9052_ADC_VBAT);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
DA9052_ADC_IN4);
static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
DA9052_ADC_IN4);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
DA9052_ADC_IN5);
static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
DA9052_ADC_IN5);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
DA9052_ADC_IN6);
static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
DA9052_ADC_IN6);
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
DA9052_ADC_VBBAT);
static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
DA9052_ADC_VBBAT);
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL,
DA9052_ADC_TBAT);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
DA9052_ADC_TBAT);
static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL,
DA9052_ADC_TJUNC);
static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL,
DA9052_ADC_TJUNC);
static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
static struct attribute *da9052_attr[] = {
&dev_attr_name.attr,
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_label.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in3_label.dev_attr.attr,
&sensor_dev_attr_in4_input.dev_attr.attr,
&sensor_dev_attr_in4_label.dev_attr.attr,
&sensor_dev_attr_in5_input.dev_attr.attr,
&sensor_dev_attr_in5_label.dev_attr.attr,
&sensor_dev_attr_in6_input.dev_attr.attr,
&sensor_dev_attr_in6_label.dev_attr.attr,
&sensor_dev_attr_in9_input.dev_attr.attr,
&sensor_dev_attr_in9_label.dev_attr.attr,
&sensor_dev_attr_curr1_input.dev_attr.attr,
&sensor_dev_attr_curr1_label.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_label.dev_attr.attr,
&sensor_dev_attr_temp8_input.dev_attr.attr,
&sensor_dev_attr_temp8_label.dev_attr.attr,
NULL
};
static const struct attribute_group da9052_attr_group = {.attrs = da9052_attr};
static int da9052_hwmon_probe(struct platform_device *pdev)
{
struct da9052_hwmon *hwmon;
int ret;
hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9052_hwmon),
GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
mutex_init(&hwmon->hwmon_lock);
hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
platform_set_drvdata(pdev, hwmon);
ret = sysfs_create_group(&pdev->dev.kobj, &da9052_attr_group);
if (ret)
goto err_mem;
hwmon->class_device = hwmon_device_register(&pdev->dev);
if (IS_ERR(hwmon->class_device)) {
ret = PTR_ERR(hwmon->class_device);
goto err_sysfs;
}
return 0;
err_sysfs:
sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
err_mem:
return ret;
}
static int da9052_hwmon_remove(struct platform_device *pdev)
{
struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
hwmon_device_unregister(hwmon->class_device);
sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
return 0;
}
static struct platform_driver da9052_hwmon_driver = {
.probe = da9052_hwmon_probe,
.remove = da9052_hwmon_remove,
.driver = {
.name = "da9052-hwmon",
.owner = THIS_MODULE,
},
};
module_platform_driver(da9052_hwmon_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("DA9052 HWMON driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-hwmon");
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