Release 4.10 drivers/hwmon/powr1220.c

Directory: drivers/hwmon
/*
 * 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 http://www.echo360.com
 * Scott Kanowitz <skanowitz@echo360.com> <scott.kanowitz@gmail.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#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;
}

Contributors
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scott kanowitz scott kanowitz 260 100.00% 1 100.00%
Total 260 100.00% 1 100.00%

/* Shows the voltage associated with the specified ADC channel */


static ssize_t powr1220_show_voltage(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);
}

Contributors
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scott kanowitz scott kanowitz 61 100.00% 1 100.00%
Total 61 100.00% 1 100.00%

/* Shows the maximum setting associated with the specified ADC channel */


static ssize_t powr1220_show_max(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]);
}

Contributors
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scott kanowitz scott kanowitz 57 100.00% 1 100.00%
Total 57 100.00% 1 100.00%

/* Shows the label associated with the specified ADC channel */


static ssize_t powr1220_show_label(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]);
}

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Total 45 100.00% 1 100.00%

static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON1);
static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON2);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON3);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON4);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON5);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON6);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON7);
static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON8);
static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON9);
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON10);
static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON11);
static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, powr1220_show_voltage, NULL,
	VMON12);
static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, powr1220_show_voltage, NULL,
	VCCA);
static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, powr1220_show_voltage, NULL,
	VCCINP);

static SENSOR_DEVICE_ATTR(in0_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON1);
static SENSOR_DEVICE_ATTR(in1_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON2);
static SENSOR_DEVICE_ATTR(in2_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON3);
static SENSOR_DEVICE_ATTR(in3_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON4);
static SENSOR_DEVICE_ATTR(in4_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON5);
static SENSOR_DEVICE_ATTR(in5_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON6);
static SENSOR_DEVICE_ATTR(in6_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON7);
static SENSOR_DEVICE_ATTR(in7_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON8);
static SENSOR_DEVICE_ATTR(in8_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON9);
static SENSOR_DEVICE_ATTR(in9_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON10);
static SENSOR_DEVICE_ATTR(in10_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON11);
static SENSOR_DEVICE_ATTR(in11_highest, S_IRUGO, powr1220_show_max, NULL,
	VMON12);
static SENSOR_DEVICE_ATTR(in12_highest, S_IRUGO, powr1220_show_max, NULL,
	VCCA);
static SENSOR_DEVICE_ATTR(in13_highest, S_IRUGO, powr1220_show_max, NULL,
	VCCINP);

static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, powr1220_show_label, NULL,
	VMON1);
static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, powr1220_show_label, NULL,
	VMON2);
static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, powr1220_show_label, NULL,
	VMON3);
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, powr1220_show_label, NULL,
	VMON4);
static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, powr1220_show_label, NULL,
	VMON5);
static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, powr1220_show_label, NULL,
	VMON6);
static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, powr1220_show_label, NULL,
	VMON7);
static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, powr1220_show_label, NULL,
	VMON8);
static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, powr1220_show_label, NULL,
	VMON9);
static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, powr1220_show_label, NULL,
	VMON10);
static SENSOR_DEVICE_ATTR(in10_label, S_IRUGO, powr1220_show_label, NULL,
	VMON11);
static SENSOR_DEVICE_ATTR(in11_label, S_IRUGO, powr1220_show_label, NULL,
	VMON12);
static SENSOR_DEVICE_ATTR(in12_label, S_IRUGO, powr1220_show_label, NULL,
	VCCA);
static SENSOR_DEVICE_ATTR(in13_label, S_IRUGO, powr1220_show_label, NULL,
	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,
		const struct i2c_device_id *id)
{
	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);
}

Contributors
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scott kanowitz scott kanowitz 108 100.00% 1 100.00%
Total 108 100.00% 1 100.00%


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		= powr1220_probe,
	.id_table	= powr1220_ids,
};


module_i2c_driver(powr1220_driver);

MODULE_AUTHOR("Scott Kanowitz");
MODULE_DESCRIPTION("POWR1220 driver");
MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
scott kanowitz scott kanowitz 1777 100.00% 1 100.00%
Total 1777 100.00% 1 100.00%
Directory: drivers/hwmon

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
scott kanowitz	scott kanowitz	260	100.00%	1	100.00%
	Total	260	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 drivers/hwmon/powr1220.c

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