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linux-next/drivers/hwmon/powr1220.c
Stephen Kitt 6748703856 hwmon: use simple i2c probe function 
Many hwmon drivers don't use the id information provided by the old
i2c probe function, and the remainder can easily be adapted to the new
form ("probe_new") by calling i2c_match_id explicitly.

This avoids scanning the identifier tables during probes.

Drivers which didn't use the id are converted as-is; drivers which did
are modified as follows:

* if the information in i2c_client is sufficient, that's used instead
  (client->name);
* anything else is handled by calling i2c_match_id() with the same
  level of error-handling (if any) as before.

A few drivers aren't included in this patch because they have a
different set of maintainers. They will be covered by other patches.

Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20200813160222.1503401-1-steve@sk2.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2020-09-23 09:42:39 -07:00

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// 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 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;
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;
}
/* Shows the voltage associated with the specified ADC channel */
static ssize_t powr1220_voltage_show(struct device *dev,
struct device_attribute *dev_attr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
int adc_val = powr1220_read_adc(dev, attr->index);
if (adc_val < 0)
return adc_val;
return sprintf(buf, "%d\n", adc_val);
}
/* Shows the maximum setting associated with the specified ADC channel */
static ssize_t powr1220_max_show(struct device *dev,
struct device_attribute *dev_attr, char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
struct powr1220_data *data = dev_get_drvdata(dev);
return sprintf(buf, "%d\n", data->adc_maxes[attr->index]);
}
/* Shows the label associated with the specified ADC channel */
static ssize_t powr1220_label_show(struct device *dev,
struct device_attribute *dev_attr,
char *buf)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
return sprintf(buf, "%s\n", input_names[attr->index]);
}
static SENSOR_DEVICE_ATTR_RO(in0_input, powr1220_voltage, VMON1);
static SENSOR_DEVICE_ATTR_RO(in1_input, powr1220_voltage, VMON2);
static SENSOR_DEVICE_ATTR_RO(in2_input, powr1220_voltage, VMON3);
static SENSOR_DEVICE_ATTR_RO(in3_input, powr1220_voltage, VMON4);
static SENSOR_DEVICE_ATTR_RO(in4_input, powr1220_voltage, VMON5);
static SENSOR_DEVICE_ATTR_RO(in5_input, powr1220_voltage, VMON6);
static SENSOR_DEVICE_ATTR_RO(in6_input, powr1220_voltage, VMON7);
static SENSOR_DEVICE_ATTR_RO(in7_input, powr1220_voltage, VMON8);
static SENSOR_DEVICE_ATTR_RO(in8_input, powr1220_voltage, VMON9);
static SENSOR_DEVICE_ATTR_RO(in9_input, powr1220_voltage, VMON10);
static SENSOR_DEVICE_ATTR_RO(in10_input, powr1220_voltage, VMON11);
static SENSOR_DEVICE_ATTR_RO(in11_input, powr1220_voltage, VMON12);
static SENSOR_DEVICE_ATTR_RO(in12_input, powr1220_voltage, VCCA);
static SENSOR_DEVICE_ATTR_RO(in13_input, powr1220_voltage, VCCINP);
static SENSOR_DEVICE_ATTR_RO(in0_highest, powr1220_max, VMON1);
static SENSOR_DEVICE_ATTR_RO(in1_highest, powr1220_max, VMON2);
static SENSOR_DEVICE_ATTR_RO(in2_highest, powr1220_max, VMON3);
static SENSOR_DEVICE_ATTR_RO(in3_highest, powr1220_max, VMON4);
static SENSOR_DEVICE_ATTR_RO(in4_highest, powr1220_max, VMON5);
static SENSOR_DEVICE_ATTR_RO(in5_highest, powr1220_max, VMON6);
static SENSOR_DEVICE_ATTR_RO(in6_highest, powr1220_max, VMON7);
static SENSOR_DEVICE_ATTR_RO(in7_highest, powr1220_max, VMON8);
static SENSOR_DEVICE_ATTR_RO(in8_highest, powr1220_max, VMON9);
static SENSOR_DEVICE_ATTR_RO(in9_highest, powr1220_max, VMON10);
static SENSOR_DEVICE_ATTR_RO(in10_highest, powr1220_max, VMON11);
static SENSOR_DEVICE_ATTR_RO(in11_highest, powr1220_max, VMON12);
static SENSOR_DEVICE_ATTR_RO(in12_highest, powr1220_max, VCCA);
static SENSOR_DEVICE_ATTR_RO(in13_highest, powr1220_max, VCCINP);
static SENSOR_DEVICE_ATTR_RO(in0_label, powr1220_label, VMON1);
static SENSOR_DEVICE_ATTR_RO(in1_label, powr1220_label, VMON2);
static SENSOR_DEVICE_ATTR_RO(in2_label, powr1220_label, VMON3);
static SENSOR_DEVICE_ATTR_RO(in3_label, powr1220_label, VMON4);
static SENSOR_DEVICE_ATTR_RO(in4_label, powr1220_label, VMON5);
static SENSOR_DEVICE_ATTR_RO(in5_label, powr1220_label, VMON6);
static SENSOR_DEVICE_ATTR_RO(in6_label, powr1220_label, VMON7);
static SENSOR_DEVICE_ATTR_RO(in7_label, powr1220_label, VMON8);
static SENSOR_DEVICE_ATTR_RO(in8_label, powr1220_label, VMON9);
static SENSOR_DEVICE_ATTR_RO(in9_label, powr1220_label, VMON10);
static SENSOR_DEVICE_ATTR_RO(in10_label, powr1220_label, VMON11);
static SENSOR_DEVICE_ATTR_RO(in11_label, powr1220_label, VMON12);
static SENSOR_DEVICE_ATTR_RO(in12_label, powr1220_label, VCCA);
static SENSOR_DEVICE_ATTR_RO(in13_label, powr1220_label, VCCINP);
static struct attribute *powr1220_attrs[] = {
&sensor_dev_attr_in0_input.dev_attr.attr,
&sensor_dev_attr_in1_input.dev_attr.attr,
&sensor_dev_attr_in2_input.dev_attr.attr,
&sensor_dev_attr_in3_input.dev_attr.attr,
&sensor_dev_attr_in4_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_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,
&sensor_dev_attr_in12_input.dev_attr.attr,
&sensor_dev_attr_in13_input.dev_attr.attr,
&sensor_dev_attr_in0_highest.dev_attr.attr,
&sensor_dev_attr_in1_highest.dev_attr.attr,
&sensor_dev_attr_in2_highest.dev_attr.attr,
&sensor_dev_attr_in3_highest.dev_attr.attr,
&sensor_dev_attr_in4_highest.dev_attr.attr,
&sensor_dev_attr_in5_highest.dev_attr.attr,
&sensor_dev_attr_in6_highest.dev_attr.attr,
&sensor_dev_attr_in7_highest.dev_attr.attr,
&sensor_dev_attr_in8_highest.dev_attr.attr,
&sensor_dev_attr_in9_highest.dev_attr.attr,
&sensor_dev_attr_in10_highest.dev_attr.attr,
&sensor_dev_attr_in11_highest.dev_attr.attr,
&sensor_dev_attr_in12_highest.dev_attr.attr,
&sensor_dev_attr_in13_highest.dev_attr.attr,
&sensor_dev_attr_in0_label.dev_attr.attr,
&sensor_dev_attr_in1_label.dev_attr.attr,
&sensor_dev_attr_in2_label.dev_attr.attr,
&sensor_dev_attr_in3_label.dev_attr.attr,
&sensor_dev_attr_in4_label.dev_attr.attr,
&sensor_dev_attr_in5_label.dev_attr.attr,
&sensor_dev_attr_in6_label.dev_attr.attr,
&sensor_dev_attr_in7_label.dev_attr.attr,
&sensor_dev_attr_in8_label.dev_attr.attr,
&sensor_dev_attr_in9_label.dev_attr.attr,
&sensor_dev_attr_in10_label.dev_attr.attr,
&sensor_dev_attr_in11_label.dev_attr.attr,
&sensor_dev_attr_in12_label.dev_attr.attr,
&sensor_dev_attr_in13_label.dev_attr.attr,
NULL
};
ATTRIBUTE_GROUPS(powr1220);
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;
mutex_init(&data->update_lock);
data->client = client;
hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
client->name, data, powr1220_groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static const struct i2c_device_id powr1220_ids[] = {
{ "powr1220", 0, },
{ }
};
MODULE_DEVICE_TABLE(i2c, powr1220_ids);
static struct i2c_driver powr1220_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "powr1220",
},
.probe_new = powr1220_probe,
.id_table = powr1220_ids,
};
module_i2c_driver(powr1220_driver);
MODULE_AUTHOR("Scott Kanowitz");
MODULE_DESCRIPTION("POWR1220 driver");
MODULE_LICENSE("GPL");
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