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alistair23-linux/drivers/hwmon/da9055-hwmon.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* HWMON Driver for Dialog DA9055
*
* Copyright(c) 2012 Dialog Semiconductor Ltd.
*
* Author: David Dajun Chen <dchen@diasemi.com>
*/
#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");
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