339 строки
7.2 KiB
C
339 строки
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* powr1220.c - Driver for the Lattice POWR1220 programmable power supply
|
|
* and monitor. Users can read all ADC inputs along with their labels
|
|
* using the sysfs nodes.
|
|
*
|
|
* Copyright (c) 2014 Echo360 https://www.echo360.com
|
|
* Scott Kanowitz <skanowitz@echo360.com> <scott.kanowitz@gmail.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/init.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/mutex.h>
|
|
#include <linux/delay.h>
|
|
|
|
#define ADC_STEP_MV 2
|
|
#define ADC_MAX_LOW_MEASUREMENT_MV 2000
|
|
|
|
enum powr1xxx_chips { powr1014, powr1220 };
|
|
|
|
enum powr1220_regs {
|
|
VMON_STATUS0,
|
|
VMON_STATUS1,
|
|
VMON_STATUS2,
|
|
OUTPUT_STATUS0,
|
|
OUTPUT_STATUS1,
|
|
OUTPUT_STATUS2,
|
|
INPUT_STATUS,
|
|
ADC_VALUE_LOW,
|
|
ADC_VALUE_HIGH,
|
|
ADC_MUX,
|
|
UES_BYTE0,
|
|
UES_BYTE1,
|
|
UES_BYTE2,
|
|
UES_BYTE3,
|
|
GP_OUTPUT1,
|
|
GP_OUTPUT2,
|
|
GP_OUTPUT3,
|
|
INPUT_VALUE,
|
|
RESET,
|
|
TRIM1_TRIM,
|
|
TRIM2_TRIM,
|
|
TRIM3_TRIM,
|
|
TRIM4_TRIM,
|
|
TRIM5_TRIM,
|
|
TRIM6_TRIM,
|
|
TRIM7_TRIM,
|
|
TRIM8_TRIM,
|
|
MAX_POWR1220_REGS
|
|
};
|
|
|
|
enum powr1220_adc_values {
|
|
VMON1,
|
|
VMON2,
|
|
VMON3,
|
|
VMON4,
|
|
VMON5,
|
|
VMON6,
|
|
VMON7,
|
|
VMON8,
|
|
VMON9,
|
|
VMON10,
|
|
VMON11,
|
|
VMON12,
|
|
VCCA,
|
|
VCCINP,
|
|
MAX_POWR1220_ADC_VALUES
|
|
};
|
|
|
|
struct powr1220_data {
|
|
struct i2c_client *client;
|
|
struct mutex update_lock;
|
|
u8 max_channels;
|
|
bool adc_valid[MAX_POWR1220_ADC_VALUES];
|
|
/* the next value is in jiffies */
|
|
unsigned long adc_last_updated[MAX_POWR1220_ADC_VALUES];
|
|
|
|
/* values */
|
|
int adc_maxes[MAX_POWR1220_ADC_VALUES];
|
|
int adc_values[MAX_POWR1220_ADC_VALUES];
|
|
};
|
|
|
|
static const char * const input_names[] = {
|
|
[VMON1] = "vmon1",
|
|
[VMON2] = "vmon2",
|
|
[VMON3] = "vmon3",
|
|
[VMON4] = "vmon4",
|
|
[VMON5] = "vmon5",
|
|
[VMON6] = "vmon6",
|
|
[VMON7] = "vmon7",
|
|
[VMON8] = "vmon8",
|
|
[VMON9] = "vmon9",
|
|
[VMON10] = "vmon10",
|
|
[VMON11] = "vmon11",
|
|
[VMON12] = "vmon12",
|
|
[VCCA] = "vcca",
|
|
[VCCINP] = "vccinp",
|
|
};
|
|
|
|
/* Reads the specified ADC channel */
|
|
static int powr1220_read_adc(struct device *dev, int ch_num)
|
|
{
|
|
struct powr1220_data *data = dev_get_drvdata(dev);
|
|
int reading;
|
|
int result;
|
|
int adc_range = 0;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) ||
|
|
!data->adc_valid[ch_num]) {
|
|
/*
|
|
* figure out if we need to use the attenuator for
|
|
* high inputs or inputs that we don't yet have a measurement
|
|
* for. We dynamically set the attenuator depending on the
|
|
* max reading.
|
|
*/
|
|
if (data->adc_maxes[ch_num] > ADC_MAX_LOW_MEASUREMENT_MV ||
|
|
data->adc_maxes[ch_num] == 0)
|
|
adc_range = 1 << 4;
|
|
|
|
/* set the attenuator and mux */
|
|
result = i2c_smbus_write_byte_data(data->client, ADC_MUX,
|
|
adc_range | ch_num);
|
|
if (result)
|
|
goto exit;
|
|
|
|
/*
|
|
* wait at least Tconvert time (200 us) for the
|
|
* conversion to complete
|
|
*/
|
|
udelay(200);
|
|
|
|
/* get the ADC reading */
|
|
result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW);
|
|
if (result < 0)
|
|
goto exit;
|
|
|
|
reading = result >> 4;
|
|
|
|
/* get the upper half of the reading */
|
|
result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH);
|
|
if (result < 0)
|
|
goto exit;
|
|
|
|
reading |= result << 4;
|
|
|
|
/* now convert the reading to a voltage */
|
|
reading *= ADC_STEP_MV;
|
|
data->adc_values[ch_num] = reading;
|
|
data->adc_valid[ch_num] = true;
|
|
data->adc_last_updated[ch_num] = jiffies;
|
|
result = reading;
|
|
|
|
if (reading > data->adc_maxes[ch_num])
|
|
data->adc_maxes[ch_num] = reading;
|
|
} else {
|
|
result = data->adc_values[ch_num];
|
|
}
|
|
|
|
exit:
|
|
mutex_unlock(&data->update_lock);
|
|
|
|
return result;
|
|
}
|
|
|
|
static umode_t
|
|
powr1220_is_visible(const void *data, enum hwmon_sensor_types type, u32
|
|
attr, int channel)
|
|
{
|
|
struct powr1220_data *chip_data = (struct powr1220_data *)data;
|
|
|
|
if (channel >= chip_data->max_channels)
|
|
return 0;
|
|
|
|
switch (type) {
|
|
case hwmon_in:
|
|
switch (attr) {
|
|
case hwmon_in_input:
|
|
case hwmon_in_highest:
|
|
case hwmon_in_label:
|
|
return 0444;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
powr1220_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
|
|
int channel, const char **str)
|
|
{
|
|
switch (type) {
|
|
case hwmon_in:
|
|
switch (attr) {
|
|
case hwmon_in_label:
|
|
*str = input_names[channel];
|
|
return 0;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static int
|
|
powr1220_read(struct device *dev, enum hwmon_sensor_types type, u32
|
|
attr, int channel, long *val)
|
|
{
|
|
struct powr1220_data *data = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
switch (type) {
|
|
case hwmon_in:
|
|
switch (attr) {
|
|
case hwmon_in_input:
|
|
ret = powr1220_read_adc(dev, channel);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = ret;
|
|
break;
|
|
case hwmon_in_highest:
|
|
*val = data->adc_maxes[channel];
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct hwmon_channel_info * const powr1220_info[] = {
|
|
HWMON_CHANNEL_INFO(in,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
|
|
HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL),
|
|
|
|
NULL
|
|
};
|
|
|
|
static const struct hwmon_ops powr1220_hwmon_ops = {
|
|
.read = powr1220_read,
|
|
.read_string = powr1220_read_string,
|
|
.is_visible = powr1220_is_visible,
|
|
};
|
|
|
|
static const struct hwmon_chip_info powr1220_chip_info = {
|
|
.ops = &powr1220_hwmon_ops,
|
|
.info = powr1220_info,
|
|
};
|
|
|
|
static const struct i2c_device_id powr1220_ids[];
|
|
|
|
static int powr1220_probe(struct i2c_client *client)
|
|
{
|
|
struct powr1220_data *data;
|
|
struct device *hwmon_dev;
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
|
|
return -ENODEV;
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
switch (i2c_match_id(powr1220_ids, client)->driver_data) {
|
|
case powr1014:
|
|
data->max_channels = 10;
|
|
break;
|
|
default:
|
|
data->max_channels = 12;
|
|
break;
|
|
}
|
|
|
|
mutex_init(&data->update_lock);
|
|
data->client = client;
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
|
|
client->name,
|
|
data,
|
|
&powr1220_chip_info,
|
|
NULL);
|
|
|
|
return PTR_ERR_OR_ZERO(hwmon_dev);
|
|
}
|
|
|
|
static const struct i2c_device_id powr1220_ids[] = {
|
|
{ "powr1014", powr1014, },
|
|
{ "powr1220", powr1220, },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, powr1220_ids);
|
|
|
|
static struct i2c_driver powr1220_driver = {
|
|
.class = I2C_CLASS_HWMON,
|
|
.driver = {
|
|
.name = "powr1220",
|
|
},
|
|
.probe = powr1220_probe,
|
|
.id_table = powr1220_ids,
|
|
};
|
|
|
|
module_i2c_driver(powr1220_driver);
|
|
|
|
MODULE_AUTHOR("Scott Kanowitz");
|
|
MODULE_DESCRIPTION("POWR1220 driver");
|
|
MODULE_LICENSE("GPL");
|