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acrn-kernel/drivers/hwmon/da9055-hwmon.c

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/*
* HWMON Driver for Dialog DA9055
*
* 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/delay.h>
#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/platform_device.h>
#include <linux/completion.h>
#include <linux/mfd/da9055/core.h>
#include <linux/mfd/da9055/reg.h>
#define DA9055_ADCIN_DIV 102
#define DA9055_VSYS_DIV 85
#define DA9055_ADC_VSYS 0
#define DA9055_ADC_ADCIN1 1
#define DA9055_ADC_ADCIN2 2
#define DA9055_ADC_ADCIN3 3
#define DA9055_ADC_TJUNC 4
struct da9055_hwmon {
struct da9055 *da9055;
struct mutex hwmon_lock;
struct mutex irq_lock;
struct completion done;
};
static const char * const input_names[] = {
[DA9055_ADC_VSYS] = "VSYS",
[DA9055_ADC_ADCIN1] = "ADC IN1",
[DA9055_ADC_ADCIN2] = "ADC IN2",
[DA9055_ADC_ADCIN3] = "ADC IN3",
[DA9055_ADC_TJUNC] = "CHIP TEMP",
};
static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {
[DA9055_ADC_VSYS] = DA9055_ADC_MUX_VSYS,
[DA9055_ADC_ADCIN1] = DA9055_ADC_MUX_ADCIN1,
[DA9055_ADC_ADCIN2] = DA9055_ADC_MUX_ADCIN2,
[DA9055_ADC_ADCIN3] = DA9055_ADC_MUX_ADCIN3,
[DA9055_ADC_TJUNC] = DA9055_ADC_MUX_T_SENSE,
};
static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,
unsigned char channel)
{
int ret;
unsigned short calc_data;
unsigned short data;
unsigned char mux_sel;
struct da9055 *da9055 = hwmon->da9055;
if (channel > DA9055_ADC_TJUNC)
return -EINVAL;
mutex_lock(&hwmon->irq_lock);
/* Selects desired MUX for manual conversion */
mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV;
ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);
if (ret < 0)
goto err;
/* Wait for an interrupt */
if (!wait_for_completion_timeout(&hwmon->done,
msecs_to_jiffies(500))) {
dev_err(da9055->dev,
"timeout waiting for ADC conversion interrupt\n");
ret = -ETIMEDOUT;
goto err;
}
ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);
if (ret < 0)
goto err;
calc_data = (unsigned short)ret;
data = calc_data << 2;
ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);
if (ret < 0)
goto err;
calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);
data |= calc_data;
ret = data;
err:
mutex_unlock(&hwmon->irq_lock);
return ret;
}
static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)
{
struct da9055_hwmon *hwmon = irq_data;
complete(&hwmon->done);
return IRQ_HANDLED;
}
/* Conversion function for VSYS and ADCINx */
static inline int volt_reg_to_mv(int value, int channel)
{
if (channel == DA9055_ADC_VSYS)
return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;
else
return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
}
static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)
{
return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,
1 << channel);
}
static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)
{
return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);
}
static ssize_t da9055_read_auto_ch(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
int ret, adc;
int channel = to_sensor_dev_attr(devattr)->index;
mutex_lock(&hwmon->hwmon_lock);
ret = da9055_enable_auto_mode(hwmon->da9055, channel);
if (ret < 0)
goto hwmon_err;
usleep_range(10000, 10500);
adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);
if (adc < 0) {
ret = adc;
goto hwmon_err_release;
}
ret = da9055_disable_auto_mode(hwmon->da9055, channel);
if (ret < 0)
goto hwmon_err;
mutex_unlock(&hwmon->hwmon_lock);
return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel));
hwmon_err_release:
da9055_disable_auto_mode(hwmon->da9055, channel);
hwmon_err:
mutex_unlock(&hwmon->hwmon_lock);
return ret;
}
static ssize_t da9055_read_tjunc(struct device *dev,
struct device_attribute *devattr, char *buf)
{
struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
int tjunc;
int toffset;
tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);
if (tjunc < 0)
return tjunc;
toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);
if (toffset < 0)
return toffset;
/*
* Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
* T_OFFSET is a trim value used to improve accuracy of the result
*/
return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
+ 3076332, 10000));
}
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, da9055_read_auto_ch, NULL,
DA9055_ADC_VSYS);
static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
DA9055_ADC_VSYS);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, da9055_read_auto_ch, NULL,
DA9055_ADC_ADCIN1);
static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, show_label, NULL,
DA9055_ADC_ADCIN1);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, da9055_read_auto_ch, NULL,
DA9055_ADC_ADCIN2);
static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, show_label, NULL,
DA9055_ADC_ADCIN2);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9055_read_auto_ch, NULL,
DA9055_ADC_ADCIN3);
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
DA9055_ADC_ADCIN3);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9055_read_tjunc, NULL,
DA9055_ADC_TJUNC);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
DA9055_ADC_TJUNC);
static struct attribute *da9055_attrs[] = {
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_label.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_label.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_label.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in3_label.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_label.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(da9055);
static int da9055_hwmon_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct da9055_hwmon *hwmon;
struct device *hwmon_dev;
int hwmon_irq, ret;
hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
mutex_init(&hwmon->hwmon_lock);
mutex_init(&hwmon->irq_lock);
init_completion(&hwmon->done);
hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);
hwmon_irq = platform_get_irq_byname(pdev, "HWMON");
if (hwmon_irq < 0)
return hwmon_irq;
ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,
NULL, da9055_auxadc_irq,
IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
"adc-irq", hwmon);
if (ret != 0) {
dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",
ret);
return ret;
}
hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055",
hwmon,
da9055_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static struct platform_driver da9055_hwmon_driver = {
.probe = da9055_hwmon_probe,
.driver = {
.name = "da9055-hwmon",
},
};
module_platform_driver(da9055_hwmon_driver);
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
MODULE_DESCRIPTION("DA9055 HWMON driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9055-hwmon");
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