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linux/drivers/hwmon/adc128d818.c
Roy van Doormaal e2f75e6b5d hwmon: (adc128d818) Fix advanced configuration register init 
If the operation mode is non-zero and an external reference voltage is set,
first the operation mode is written to the advanced configuration register,
followed by the externel reference enable bit,
resetting the configuration mode to 0.

To fix this, first compose the value of the advanced configuration register
based on the configuration mode and the external reference voltage.
The advanced configuration register is then written to the device,
if it is different from the default register value (0x0).

Signed-off-by: Roy van Doormaal <roy.van.doormaal@prodrive-technologies.com>
Link: https://lore.kernel.org/r/20200728151846.231785-1-roy.van.doormaal@prodrive-technologies.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-08-04 14:28:03 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for TI ADC128D818 System Monitor with Temperature Sensor
*
* Copyright (c) 2014 Guenter Roeck
*
* Derived from lm80.c
* Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
* and Philip Edelbrock <phil@netroedge.com>
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <linux/bitops.h>
#include <linux/of.h>
/* Addresses to scan
* The chip also supports addresses 0x35..0x37. Don't scan those addresses
* since they are also used by some EEPROMs, which may result in false
* positives.
*/
static const unsigned short normal_i2c[] = {
0x1d, 0x1e, 0x1f, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };
/* registers */
#define ADC128_REG_IN_MAX(nr) (0x2a + (nr) * 2)
#define ADC128_REG_IN_MIN(nr) (0x2b + (nr) * 2)
#define ADC128_REG_IN(nr) (0x20 + (nr))
#define ADC128_REG_TEMP 0x27
#define ADC128_REG_TEMP_MAX 0x38
#define ADC128_REG_TEMP_HYST 0x39
#define ADC128_REG_CONFIG 0x00
#define ADC128_REG_ALARM 0x01
#define ADC128_REG_MASK 0x03
#define ADC128_REG_CONV_RATE 0x07
#define ADC128_REG_ONESHOT 0x09
#define ADC128_REG_SHUTDOWN 0x0a
#define ADC128_REG_CONFIG_ADV 0x0b
#define ADC128_REG_BUSY_STATUS 0x0c
#define ADC128_REG_MAN_ID 0x3e
#define ADC128_REG_DEV_ID 0x3f
/* No. of voltage entries in adc128_attrs */
#define ADC128_ATTR_NUM_VOLT (8 * 4)
/* Voltage inputs visible per operation mode */
static const u8 num_inputs[] = { 7, 8, 4, 6 };
struct adc128_data {
struct i2c_client *client;
struct regulator *regulator;
int vref; /* Reference voltage in mV */
struct mutex update_lock;
u8 mode; /* Operation mode */
bool valid; /* true if following fields are valid */
unsigned long last_updated; /* In jiffies */
u16 in[3][8]; /* Register value, normalized to 12 bit
* 0: input voltage
* 1: min limit
* 2: max limit
*/
s16 temp[3]; /* Register value, normalized to 9 bit
* 0: sensor 1: limit 2: hyst
*/
u8 alarms; /* alarm register value */
};
static struct adc128_data *adc128_update_device(struct device *dev)
{
struct adc128_data *data = dev_get_drvdata(dev);
struct i2c_client *client = data->client;
struct adc128_data *ret = data;
int i, rv;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
for (i = 0; i < num_inputs[data->mode]; i++) {
rv = i2c_smbus_read_word_swapped(client,
ADC128_REG_IN(i));
if (rv < 0)
goto abort;
data->in[0][i] = rv >> 4;
rv = i2c_smbus_read_byte_data(client,
ADC128_REG_IN_MIN(i));
if (rv < 0)
goto abort;
data->in[1][i] = rv << 4;
rv = i2c_smbus_read_byte_data(client,
ADC128_REG_IN_MAX(i));
if (rv < 0)
goto abort;
data->in[2][i] = rv << 4;
}
if (data->mode != 1) {
rv = i2c_smbus_read_word_swapped(client,
ADC128_REG_TEMP);
if (rv < 0)
goto abort;
data->temp[0] = rv >> 7;
rv = i2c_smbus_read_byte_data(client,
ADC128_REG_TEMP_MAX);
if (rv < 0)
goto abort;
data->temp[1] = rv << 1;
rv = i2c_smbus_read_byte_data(client,
ADC128_REG_TEMP_HYST);
if (rv < 0)
goto abort;
data->temp[2] = rv << 1;
}
rv = i2c_smbus_read_byte_data(client, ADC128_REG_ALARM);
if (rv < 0)
goto abort;
data->alarms |= rv;
data->last_updated = jiffies;
data->valid = true;
}
goto done;
abort:
ret = ERR_PTR(rv);
data->valid = false;
done:
mutex_unlock(&data->update_lock);
return ret;
}
static ssize_t adc128_in_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct adc128_data *data = adc128_update_device(dev);
int index = to_sensor_dev_attr_2(attr)->index;
int nr = to_sensor_dev_attr_2(attr)->nr;
int val;
if (IS_ERR(data))
return PTR_ERR(data);
val = DIV_ROUND_CLOSEST(data->in[index][nr] * data->vref, 4095);
return sprintf(buf, "%d\n", val);
}
static ssize_t adc128_in_store(struct device *dev,
struct device_attribute *attr, const char *buf,
size_t count)
{
struct adc128_data *data = dev_get_drvdata(dev);
int index = to_sensor_dev_attr_2(attr)->index;
int nr = to_sensor_dev_attr_2(attr)->nr;
u8 reg, regval;
long val;
int err;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
mutex_lock(&data->update_lock);
/* 10 mV LSB on limit registers */
regval = clamp_val(DIV_ROUND_CLOSEST(val, 10), 0, 255);
data->in[index][nr] = regval << 4;
reg = index == 1 ? ADC128_REG_IN_MIN(nr) : ADC128_REG_IN_MAX(nr);
i2c_smbus_write_byte_data(data->client, reg, regval);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t adc128_temp_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct adc128_data *data = adc128_update_device(dev);
int index = to_sensor_dev_attr(attr)->index;
int temp;
if (IS_ERR(data))
return PTR_ERR(data);
temp = sign_extend32(data->temp[index], 8);
return sprintf(buf, "%d\n", temp * 500);/* 0.5 degrees C resolution */
}
static ssize_t adc128_temp_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct adc128_data *data = dev_get_drvdata(dev);
int index = to_sensor_dev_attr(attr)->index;
long val;
int err;
s8 regval;
err = kstrtol(buf, 10, &val);
if (err < 0)
return err;
mutex_lock(&data->update_lock);
regval = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);
data->temp[index] = regval << 1;
i2c_smbus_write_byte_data(data->client,
index == 1 ? ADC128_REG_TEMP_MAX
: ADC128_REG_TEMP_HYST,
regval);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t adc128_alarm_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct adc128_data *data = adc128_update_device(dev);
int mask = 1 << to_sensor_dev_attr(attr)->index;
u8 alarms;
if (IS_ERR(data))
return PTR_ERR(data);
/*
* Clear an alarm after reporting it to user space. If it is still
* active, the next update sequence will set the alarm bit again.
*/
alarms = data->alarms;
data->alarms &= ~mask;
return sprintf(buf, "%u\n", !!(alarms & mask));
}
static umode_t adc128_is_visible(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct adc128_data *data = dev_get_drvdata(dev);
if (index < ADC128_ATTR_NUM_VOLT) {
/* Voltage, visible according to num_inputs[] */
if (index >= num_inputs[data->mode] * 4)
return 0;
} else {
/* Temperature, visible if not in mode 1 */
if (data->mode == 1)
return 0;
}
return attr->mode;
}
static SENSOR_DEVICE_ATTR_2_RO(in0_input, adc128_in, 0, 0);
static SENSOR_DEVICE_ATTR_2_RW(in0_min, adc128_in, 0, 1);
static SENSOR_DEVICE_ATTR_2_RW(in0_max, adc128_in, 0, 2);
static SENSOR_DEVICE_ATTR_2_RO(in1_input, adc128_in, 1, 0);
static SENSOR_DEVICE_ATTR_2_RW(in1_min, adc128_in, 1, 1);
static SENSOR_DEVICE_ATTR_2_RW(in1_max, adc128_in, 1, 2);
static SENSOR_DEVICE_ATTR_2_RO(in2_input, adc128_in, 2, 0);
static SENSOR_DEVICE_ATTR_2_RW(in2_min, adc128_in, 2, 1);
static SENSOR_DEVICE_ATTR_2_RW(in2_max, adc128_in, 2, 2);
static SENSOR_DEVICE_ATTR_2_RO(in3_input, adc128_in, 3, 0);
static SENSOR_DEVICE_ATTR_2_RW(in3_min, adc128_in, 3, 1);
static SENSOR_DEVICE_ATTR_2_RW(in3_max, adc128_in, 3, 2);
static SENSOR_DEVICE_ATTR_2_RO(in4_input, adc128_in, 4, 0);
static SENSOR_DEVICE_ATTR_2_RW(in4_min, adc128_in, 4, 1);
static SENSOR_DEVICE_ATTR_2_RW(in4_max, adc128_in, 4, 2);
static SENSOR_DEVICE_ATTR_2_RO(in5_input, adc128_in, 5, 0);
static SENSOR_DEVICE_ATTR_2_RW(in5_min, adc128_in, 5, 1);
static SENSOR_DEVICE_ATTR_2_RW(in5_max, adc128_in, 5, 2);
static SENSOR_DEVICE_ATTR_2_RO(in6_input, adc128_in, 6, 0);
static SENSOR_DEVICE_ATTR_2_RW(in6_min, adc128_in, 6, 1);
static SENSOR_DEVICE_ATTR_2_RW(in6_max, adc128_in, 6, 2);
static SENSOR_DEVICE_ATTR_2_RO(in7_input, adc128_in, 7, 0);
static SENSOR_DEVICE_ATTR_2_RW(in7_min, adc128_in, 7, 1);
static SENSOR_DEVICE_ATTR_2_RW(in7_max, adc128_in, 7, 2);
static SENSOR_DEVICE_ATTR_RO(temp1_input, adc128_temp, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_max, adc128_temp, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adc128_temp, 2);
static SENSOR_DEVICE_ATTR_RO(in0_alarm, adc128_alarm, 0);
static SENSOR_DEVICE_ATTR_RO(in1_alarm, adc128_alarm, 1);
static SENSOR_DEVICE_ATTR_RO(in2_alarm, adc128_alarm, 2);
static SENSOR_DEVICE_ATTR_RO(in3_alarm, adc128_alarm, 3);
static SENSOR_DEVICE_ATTR_RO(in4_alarm, adc128_alarm, 4);
static SENSOR_DEVICE_ATTR_RO(in5_alarm, adc128_alarm, 5);
static SENSOR_DEVICE_ATTR_RO(in6_alarm, adc128_alarm, 6);
static SENSOR_DEVICE_ATTR_RO(in7_alarm, adc128_alarm, 7);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adc128_alarm, 7);
static struct attribute *adc128_attrs[] = {
&sensor_dev_attr_in0_alarm.dev_attr.attr,
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in0_max.dev_attr.attr,
&sensor_dev_attr_in0_min.dev_attr.attr,
&sensor_dev_attr_in1_alarm.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in1_max.dev_attr.attr,
&sensor_dev_attr_in1_min.dev_attr.attr,
&sensor_dev_attr_in2_alarm.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in2_max.dev_attr.attr,
&sensor_dev_attr_in2_min.dev_attr.attr,
&sensor_dev_attr_in3_alarm.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in3_max.dev_attr.attr,
&sensor_dev_attr_in3_min.dev_attr.attr,
&sensor_dev_attr_in4_alarm.dev_attr.attr,
&sensor_dev_attr_in4_input.dev_attr.attr,
&sensor_dev_attr_in4_max.dev_attr.attr,
&sensor_dev_attr_in4_min.dev_attr.attr,
&sensor_dev_attr_in5_alarm.dev_attr.attr,
&sensor_dev_attr_in5_input.dev_attr.attr,
&sensor_dev_attr_in5_max.dev_attr.attr,
&sensor_dev_attr_in5_min.dev_attr.attr,
&sensor_dev_attr_in6_alarm.dev_attr.attr,
&sensor_dev_attr_in6_input.dev_attr.attr,
&sensor_dev_attr_in6_max.dev_attr.attr,
&sensor_dev_attr_in6_min.dev_attr.attr,
&sensor_dev_attr_in7_alarm.dev_attr.attr,
&sensor_dev_attr_in7_input.dev_attr.attr,
&sensor_dev_attr_in7_max.dev_attr.attr,
&sensor_dev_attr_in7_min.dev_attr.attr,
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
NULL
};
static const struct attribute_group adc128_group = {
.attrs = adc128_attrs,
.is_visible = adc128_is_visible,
};
__ATTRIBUTE_GROUPS(adc128);
static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
{
int man_id, dev_id;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
man_id = i2c_smbus_read_byte_data(client, ADC128_REG_MAN_ID);
dev_id = i2c_smbus_read_byte_data(client, ADC128_REG_DEV_ID);
if (man_id != 0x01 || dev_id != 0x09)
return -ENODEV;
/* Check unused bits for confirmation */
if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG) & 0xf4)
return -ENODEV;
if (i2c_smbus_read_byte_data(client, ADC128_REG_CONV_RATE) & 0xfe)
return -ENODEV;
if (i2c_smbus_read_byte_data(client, ADC128_REG_ONESHOT) & 0xfe)
return -ENODEV;
if (i2c_smbus_read_byte_data(client, ADC128_REG_SHUTDOWN) & 0xfe)
return -ENODEV;
if (i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV) & 0xf8)
return -ENODEV;
if (i2c_smbus_read_byte_data(client, ADC128_REG_BUSY_STATUS) & 0xfc)
return -ENODEV;
strlcpy(info->type, "adc128d818", I2C_NAME_SIZE);
return 0;
}
static int adc128_init_client(struct adc128_data *data)
{
struct i2c_client *client = data->client;
int err;
u8 regval = 0x0;
/*
* Reset chip to defaults.
* This makes most other initializations unnecessary.
*/
err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x80);
if (err)
return err;
/* Set operation mode, if non-default */
if (data->mode != 0)
regval |= data->mode << 1;
/* If external vref is selected, configure the chip to use it */
if (data->regulator)
regval |= 0x01;
/* Write advanced configuration register */
if (regval != 0x0) {
err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG_ADV,
regval);
if (err)
return err;
}
/* Start monitoring */
err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);
if (err)
return err;
return 0;
}
static int adc128_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct regulator *regulator;
struct device *hwmon_dev;
struct adc128_data *data;
int err, vref;
data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
/* vref is optional. If specified, is used as chip reference voltage */
regulator = devm_regulator_get_optional(dev, "vref");
if (!IS_ERR(regulator)) {
data->regulator = regulator;
err = regulator_enable(regulator);
if (err < 0)
return err;
vref = regulator_get_voltage(regulator);
if (vref < 0) {
err = vref;
goto error;
}
data->vref = DIV_ROUND_CLOSEST(vref, 1000);
} else {
data->vref = 2560; /* 2.56V, in mV */
}
/* Operation mode is optional. If unspecified, keep current mode */
if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
if (data->mode > 3) {
dev_err(dev, "invalid operation mode %d\n",
data->mode);
err = -EINVAL;
goto error;
}
} else {
err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
if (err < 0)
goto error;
data->mode = (err >> 1) & ADC128_REG_MASK;
}
data->client = client;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* Initialize the chip */
err = adc128_init_client(data);
if (err < 0)
goto error;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, adc128_groups);
if (IS_ERR(hwmon_dev)) {
err = PTR_ERR(hwmon_dev);
goto error;
}
return 0;
error:
if (data->regulator)
regulator_disable(data->regulator);
return err;
}
static int adc128_remove(struct i2c_client *client)
{
struct adc128_data *data = i2c_get_clientdata(client);
if (data->regulator)
regulator_disable(data->regulator);
return 0;
}
static const struct i2c_device_id adc128_id[] = {
{ "adc128d818", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, adc128_id);
static const struct of_device_id __maybe_unused adc128_of_match[] = {
{ .compatible = "ti,adc128d818" },
{ },
};
MODULE_DEVICE_TABLE(of, adc128_of_match);
static struct i2c_driver adc128_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "adc128d818",
.of_match_table = of_match_ptr(adc128_of_match),
},
.probe = adc128_probe,
.remove = adc128_remove,
.id_table = adc128_id,
.detect = adc128_detect,
.address_list = normal_i2c,
};
module_i2c_driver(adc128_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("Driver for ADC128D818");
MODULE_LICENSE("GPL");
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