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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs.
*
* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
* Copyright (C) 2009 Sascha Hauer, Pengutronix
*/
#include <linux/mfd/mc13xxx.h>
#include <linux/platform_device.h>
#include <linux/hwmon-sysfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/hwmon.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#define DRIVER_NAME "mc13783-adc"
/* platform device id driver data */
#define MC13783_ADC_16CHANS 1
#define MC13783_ADC_BPDIV2 2
struct mc13783_adc_priv {
struct mc13xxx *mc13xxx;
struct device *hwmon_dev;
char name[PLATFORM_NAME_SIZE];
};
static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
char *buf)
{
struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", priv->name);
}
static int mc13783_adc_read(struct device *dev,
struct device_attribute *devattr, unsigned int *val)
{
struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
unsigned int channel = attr->index;
unsigned int sample[4];
int ret;
ret = mc13xxx_adc_do_conversion(priv->mc13xxx,
MC13XXX_ADC_MODE_MULT_CHAN,
channel, 0, 0, sample);
if (ret)
return ret;
/* ADIN7 subchannels */
if (channel >= 16)
channel = 7;
channel &= 0x7;
*val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
return 0;
}
static ssize_t mc13783_adc_read_bp(struct device *dev,
struct device_attribute *devattr, char *buf)
{
unsigned val;
struct platform_device *pdev = to_platform_device(dev);
kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
int ret = mc13783_adc_read(dev, devattr, &val);
if (ret)
return ret;
if (driver_data & MC13783_ADC_BPDIV2)
val = DIV_ROUND_CLOSEST(val * 9, 2);
else
/*
* BP (channel 2) reports with offset 2.4V to the actual value
* to fit the input range of the ADC. unit = 2.25mV = 9/4 mV.
*/
val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;
return sprintf(buf, "%u\n", val);
}
static ssize_t mc13783_adc_read_gp(struct device *dev,
struct device_attribute *devattr, char *buf)
{
unsigned val;
int ret = mc13783_adc_read(dev, devattr, &val);
if (ret)
return ret;
/*
* input range is [0, 2.3V], val has 10 bits, so each bit
* is worth 9/4 mV.
*/
val = DIV_ROUND_CLOSEST(val * 9, 4);
return sprintf(buf, "%u\n", val);
}
static ssize_t mc13783_adc_read_uid(struct device *dev,
struct device_attribute *devattr, char *buf)
{
unsigned int val;
struct platform_device *pdev = to_platform_device(dev);
kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
int ret = mc13783_adc_read(dev, devattr, &val);
if (ret)
return ret;
if (driver_data & MC13783_ADC_BPDIV2)
/* MC13892 have 1/2 divider, input range is [0, 4.800V] */
val = DIV_ROUND_CLOSEST(val * 4800, 1024);
else
/* MC13783 have 0.9 divider, input range is [0, 2.555V] */
val = DIV_ROUND_CLOSEST(val * 2555, 1024);
return sprintf(buf, "%u\n", val);
}
static ssize_t mc13783_adc_read_temp(struct device *dev,
struct device_attribute *devattr, char *buf)
{
unsigned int val;
struct platform_device *pdev = to_platform_device(dev);
kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
int ret = mc13783_adc_read(dev, devattr, &val);
if (ret)
return ret;
if (driver_data & MC13783_ADC_BPDIV2) {
/*
* MC13892:
* Die Temperature Read Out Code at 25C 680
* Temperature change per LSB +0.4244C
*/
ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);
} else {
/*
* MC13783:
* Die Temperature Read Out Code at 25C 282
* Temperature change per LSB -1.14C
*/
ret = 346480 - 1140 * val;
}
return sprintf(buf, "%d\n", ret);
}
static DEVICE_ATTR_RO(name);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, mc13783_adc_read_bp, NULL, 2);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, mc13783_adc_read_gp, NULL, 5);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, mc13783_adc_read_gp, NULL, 6);
static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, mc13783_adc_read_gp, NULL, 7);
static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, mc13783_adc_read_gp, NULL, 8);
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, mc13783_adc_read_gp, NULL, 9);
static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, mc13783_adc_read_gp, NULL, 10);
static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, mc13783_adc_read_gp, NULL, 11);
static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, mc13783_adc_read_gp, NULL, 12);
static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, mc13783_adc_read_gp, NULL, 13);
static SENSOR_DEVICE_ATTR(in14_input, S_IRUGO, mc13783_adc_read_gp, NULL, 14);
static SENSOR_DEVICE_ATTR(in15_input, S_IRUGO, mc13783_adc_read_gp, NULL, 15);
static SENSOR_DEVICE_ATTR(in16_input, S_IRUGO, mc13783_adc_read_uid, NULL, 16);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
mc13783_adc_read_temp, NULL, 17);
static struct attribute *mc13783_attr_base[] = {
&dev_attr_name.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in5_input.dev_attr.attr,
&sensor_dev_attr_in6_input.dev_attr.attr,
&sensor_dev_attr_in7_input.dev_attr.attr,
&sensor_dev_attr_in16_input.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
NULL
};
static const struct attribute_group mc13783_group_base = {
.attrs = mc13783_attr_base,
};
/* these are only used if MC13783_ADC_16CHANS is provided in driver data */
static struct attribute *mc13783_attr_16chans[] = {
&sensor_dev_attr_in8_input.dev_attr.attr,
&sensor_dev_attr_in9_input.dev_attr.attr,
&sensor_dev_attr_in10_input.dev_attr.attr,
&sensor_dev_attr_in11_input.dev_attr.attr,
NULL
};
static const struct attribute_group mc13783_group_16chans = {
.attrs = mc13783_attr_16chans,
};
/* last four channels may be occupied by the touchscreen */
static struct attribute *mc13783_attr_ts[] = {
&sensor_dev_attr_in12_input.dev_attr.attr,
&sensor_dev_attr_in13_input.dev_attr.attr,
&sensor_dev_attr_in14_input.dev_attr.attr,
&sensor_dev_attr_in15_input.dev_attr.attr,
NULL
};
static const struct attribute_group mc13783_group_ts = {
.attrs = mc13783_attr_ts,
};
static int mc13783_adc_use_touchscreen(struct platform_device *pdev)
{
struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
unsigned flags = mc13xxx_get_flags(priv->mc13xxx);
return flags & MC13XXX_USE_TOUCHSCREEN;
}
static int __init mc13783_adc_probe(struct platform_device *pdev)
{
struct mc13783_adc_priv *priv;
int ret;
const struct platform_device_id *id = platform_get_device_id(pdev);
char *dash;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name);
dash = strchr(priv->name, '-');
if (dash)
*dash = '\0';
platform_set_drvdata(pdev, priv);
/* Register sysfs hooks */
ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base);
if (ret)
return ret;
if (id->driver_data & MC13783_ADC_16CHANS) {
ret = sysfs_create_group(&pdev->dev.kobj,
&mc13783_group_16chans);
if (ret)
goto out_err_create_16chans;
}
if (!mc13783_adc_use_touchscreen(pdev)) {
ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
if (ret)
goto out_err_create_ts;
}
priv->hwmon_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(priv->hwmon_dev)) {
ret = PTR_ERR(priv->hwmon_dev);
dev_err(&pdev->dev,
"hwmon_device_register failed with %d.\n", ret);
goto out_err_register;
}
return 0;
out_err_register:
if (!mc13783_adc_use_touchscreen(pdev))
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
out_err_create_ts:
if (id->driver_data & MC13783_ADC_16CHANS)
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
out_err_create_16chans:
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
return ret;
}
static int mc13783_adc_remove(struct platform_device *pdev)
{
struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
hwmon_device_unregister(priv->hwmon_dev);
if (!mc13783_adc_use_touchscreen(pdev))
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
if (driver_data & MC13783_ADC_16CHANS)
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
return 0;
}
static const struct platform_device_id mc13783_adc_idtable[] = {
{
.name = "mc13783-adc",
.driver_data = MC13783_ADC_16CHANS,
}, {
.name = "mc13892-adc",
.driver_data = MC13783_ADC_BPDIV2,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable);
static struct platform_driver mc13783_adc_driver = {
.remove = mc13783_adc_remove,
.driver = {
.name = DRIVER_NAME,
},
.id_table = mc13783_adc_idtable,
};
module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe);
MODULE_DESCRIPTION("MC13783 ADC driver");
MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
MODULE_LICENSE("GPL");
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