289 lines
7.3 KiB
C
289 lines
7.3 KiB
C
/*
|
|
* 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_auto_ch_show(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_tjunc_show(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 label_show(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_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS);
|
|
static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS);
|
|
static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1);
|
|
static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1);
|
|
static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2);
|
|
static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2);
|
|
static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3);
|
|
static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3);
|
|
|
|
static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC);
|
|
static SENSOR_DEVICE_ATTR_RO(temp1_label, label, 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");
|