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391 lines
11 KiB
391 lines
11 KiB
/*
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* powr1220.c - Driver for the Lattice POWR1220 programmable power supply
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* and monitor. Users can read all ADC inputs along with their labels
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* using the sysfs nodes.
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*
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* Copyright (c) 2014 Echo360 http://www.echo360.com
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* Scott Kanowitz <skanowitz@echo360.com> <scott.kanowitz@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/delay.h>
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#define ADC_STEP_MV 2
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#define ADC_MAX_LOW_MEASUREMENT_MV 2000
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enum powr1220_regs {
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VMON_STATUS0,
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VMON_STATUS1,
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VMON_STATUS2,
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OUTPUT_STATUS0,
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OUTPUT_STATUS1,
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OUTPUT_STATUS2,
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INPUT_STATUS,
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ADC_VALUE_LOW,
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ADC_VALUE_HIGH,
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ADC_MUX,
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UES_BYTE0,
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UES_BYTE1,
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UES_BYTE2,
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UES_BYTE3,
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GP_OUTPUT1,
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GP_OUTPUT2,
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GP_OUTPUT3,
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INPUT_VALUE,
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RESET,
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TRIM1_TRIM,
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TRIM2_TRIM,
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TRIM3_TRIM,
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TRIM4_TRIM,
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TRIM5_TRIM,
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TRIM6_TRIM,
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TRIM7_TRIM,
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TRIM8_TRIM,
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MAX_POWR1220_REGS
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};
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enum powr1220_adc_values {
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VMON1,
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VMON2,
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VMON3,
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VMON4,
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VMON5,
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VMON6,
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VMON7,
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VMON8,
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VMON9,
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VMON10,
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VMON11,
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VMON12,
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VCCA,
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VCCINP,
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MAX_POWR1220_ADC_VALUES
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};
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struct powr1220_data {
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struct i2c_client *client;
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struct mutex update_lock;
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bool adc_valid[MAX_POWR1220_ADC_VALUES];
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/* the next value is in jiffies */
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unsigned long adc_last_updated[MAX_POWR1220_ADC_VALUES];
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/* values */
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int adc_maxes[MAX_POWR1220_ADC_VALUES];
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int adc_values[MAX_POWR1220_ADC_VALUES];
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};
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static const char * const input_names[] = {
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[VMON1] = "vmon1",
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[VMON2] = "vmon2",
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[VMON3] = "vmon3",
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[VMON4] = "vmon4",
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[VMON5] = "vmon5",
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[VMON6] = "vmon6",
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[VMON7] = "vmon7",
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[VMON8] = "vmon8",
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[VMON9] = "vmon9",
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[VMON10] = "vmon10",
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[VMON11] = "vmon11",
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[VMON12] = "vmon12",
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[VCCA] = "vcca",
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[VCCINP] = "vccinp",
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};
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/* Reads the specified ADC channel */
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static int powr1220_read_adc(struct device *dev, int ch_num)
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{
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struct powr1220_data *data = dev_get_drvdata(dev);
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int reading;
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int result;
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int adc_range = 0;
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mutex_lock(&data->update_lock);
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if (time_after(jiffies, data->adc_last_updated[ch_num] + HZ) ||
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!data->adc_valid[ch_num]) {
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/*
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* figure out if we need to use the attenuator for
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* high inputs or inputs that we don't yet have a measurement
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* for. We dynamically set the attenuator depending on the
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* max reading.
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*/
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if (data->adc_maxes[ch_num] > ADC_MAX_LOW_MEASUREMENT_MV ||
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data->adc_maxes[ch_num] == 0)
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adc_range = 1 << 4;
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/* set the attenuator and mux */
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result = i2c_smbus_write_byte_data(data->client, ADC_MUX,
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adc_range | ch_num);
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if (result)
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goto exit;
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/*
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* wait at least Tconvert time (200 us) for the
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* conversion to complete
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*/
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udelay(200);
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/* get the ADC reading */
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result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_LOW);
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if (result < 0)
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goto exit;
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reading = result >> 4;
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/* get the upper half of the reading */
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result = i2c_smbus_read_byte_data(data->client, ADC_VALUE_HIGH);
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if (result < 0)
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goto exit;
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reading |= result << 4;
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/* now convert the reading to a voltage */
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reading *= ADC_STEP_MV;
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data->adc_values[ch_num] = reading;
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data->adc_valid[ch_num] = true;
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data->adc_last_updated[ch_num] = jiffies;
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result = reading;
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if (reading > data->adc_maxes[ch_num])
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data->adc_maxes[ch_num] = reading;
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} else {
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result = data->adc_values[ch_num];
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}
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exit:
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mutex_unlock(&data->update_lock);
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return result;
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}
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/* Shows the voltage associated with the specified ADC channel */
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static ssize_t powr1220_show_voltage(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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int adc_val = powr1220_read_adc(dev, attr->index);
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if (adc_val < 0)
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return adc_val;
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return sprintf(buf, "%d\n", adc_val);
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}
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/* Shows the maximum setting associated with the specified ADC channel */
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static ssize_t powr1220_show_max(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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struct powr1220_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", data->adc_maxes[attr->index]);
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}
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/* Shows the label associated with the specified ADC channel */
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static ssize_t powr1220_show_label(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
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return sprintf(buf, "%s\n", input_names[attr->index]);
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}
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static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON1);
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static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON2);
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static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON3);
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static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON4);
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static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON5);
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static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON6);
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static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON7);
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static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON8);
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static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON9);
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static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON10);
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static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON11);
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static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, powr1220_show_voltage, NULL,
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VMON12);
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static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, powr1220_show_voltage, NULL,
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VCCA);
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static SENSOR_DEVICE_ATTR(in13_input, S_IRUGO, powr1220_show_voltage, NULL,
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VCCINP);
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static SENSOR_DEVICE_ATTR(in0_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON1);
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static SENSOR_DEVICE_ATTR(in1_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON2);
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static SENSOR_DEVICE_ATTR(in2_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON3);
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static SENSOR_DEVICE_ATTR(in3_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON4);
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static SENSOR_DEVICE_ATTR(in4_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON5);
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static SENSOR_DEVICE_ATTR(in5_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON6);
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static SENSOR_DEVICE_ATTR(in6_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON7);
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static SENSOR_DEVICE_ATTR(in7_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON8);
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static SENSOR_DEVICE_ATTR(in8_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON9);
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static SENSOR_DEVICE_ATTR(in9_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON10);
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static SENSOR_DEVICE_ATTR(in10_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON11);
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static SENSOR_DEVICE_ATTR(in11_highest, S_IRUGO, powr1220_show_max, NULL,
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VMON12);
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static SENSOR_DEVICE_ATTR(in12_highest, S_IRUGO, powr1220_show_max, NULL,
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VCCA);
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static SENSOR_DEVICE_ATTR(in13_highest, S_IRUGO, powr1220_show_max, NULL,
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VCCINP);
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static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, powr1220_show_label, NULL,
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VMON1);
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static SENSOR_DEVICE_ATTR(in1_label, S_IRUGO, powr1220_show_label, NULL,
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VMON2);
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static SENSOR_DEVICE_ATTR(in2_label, S_IRUGO, powr1220_show_label, NULL,
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VMON3);
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static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, powr1220_show_label, NULL,
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VMON4);
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static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, powr1220_show_label, NULL,
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VMON5);
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static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, powr1220_show_label, NULL,
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VMON6);
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static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, powr1220_show_label, NULL,
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VMON7);
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static SENSOR_DEVICE_ATTR(in7_label, S_IRUGO, powr1220_show_label, NULL,
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VMON8);
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static SENSOR_DEVICE_ATTR(in8_label, S_IRUGO, powr1220_show_label, NULL,
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VMON9);
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static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, powr1220_show_label, NULL,
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VMON10);
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static SENSOR_DEVICE_ATTR(in10_label, S_IRUGO, powr1220_show_label, NULL,
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VMON11);
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static SENSOR_DEVICE_ATTR(in11_label, S_IRUGO, powr1220_show_label, NULL,
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VMON12);
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static SENSOR_DEVICE_ATTR(in12_label, S_IRUGO, powr1220_show_label, NULL,
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VCCA);
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static SENSOR_DEVICE_ATTR(in13_label, S_IRUGO, powr1220_show_label, NULL,
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VCCINP);
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static struct attribute *powr1220_attrs[] = {
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&sensor_dev_attr_in0_input.dev_attr.attr,
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&sensor_dev_attr_in1_input.dev_attr.attr,
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&sensor_dev_attr_in2_input.dev_attr.attr,
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&sensor_dev_attr_in3_input.dev_attr.attr,
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&sensor_dev_attr_in4_input.dev_attr.attr,
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&sensor_dev_attr_in5_input.dev_attr.attr,
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&sensor_dev_attr_in6_input.dev_attr.attr,
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&sensor_dev_attr_in7_input.dev_attr.attr,
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&sensor_dev_attr_in8_input.dev_attr.attr,
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&sensor_dev_attr_in9_input.dev_attr.attr,
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&sensor_dev_attr_in10_input.dev_attr.attr,
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&sensor_dev_attr_in11_input.dev_attr.attr,
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&sensor_dev_attr_in12_input.dev_attr.attr,
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&sensor_dev_attr_in13_input.dev_attr.attr,
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&sensor_dev_attr_in0_highest.dev_attr.attr,
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&sensor_dev_attr_in1_highest.dev_attr.attr,
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&sensor_dev_attr_in2_highest.dev_attr.attr,
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&sensor_dev_attr_in3_highest.dev_attr.attr,
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&sensor_dev_attr_in4_highest.dev_attr.attr,
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&sensor_dev_attr_in5_highest.dev_attr.attr,
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&sensor_dev_attr_in6_highest.dev_attr.attr,
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&sensor_dev_attr_in7_highest.dev_attr.attr,
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&sensor_dev_attr_in8_highest.dev_attr.attr,
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&sensor_dev_attr_in9_highest.dev_attr.attr,
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&sensor_dev_attr_in10_highest.dev_attr.attr,
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&sensor_dev_attr_in11_highest.dev_attr.attr,
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&sensor_dev_attr_in12_highest.dev_attr.attr,
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&sensor_dev_attr_in13_highest.dev_attr.attr,
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&sensor_dev_attr_in0_label.dev_attr.attr,
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&sensor_dev_attr_in1_label.dev_attr.attr,
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&sensor_dev_attr_in2_label.dev_attr.attr,
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&sensor_dev_attr_in3_label.dev_attr.attr,
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&sensor_dev_attr_in4_label.dev_attr.attr,
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&sensor_dev_attr_in5_label.dev_attr.attr,
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&sensor_dev_attr_in6_label.dev_attr.attr,
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&sensor_dev_attr_in7_label.dev_attr.attr,
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&sensor_dev_attr_in8_label.dev_attr.attr,
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&sensor_dev_attr_in9_label.dev_attr.attr,
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&sensor_dev_attr_in10_label.dev_attr.attr,
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&sensor_dev_attr_in11_label.dev_attr.attr,
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&sensor_dev_attr_in12_label.dev_attr.attr,
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&sensor_dev_attr_in13_label.dev_attr.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(powr1220);
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static int powr1220_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct powr1220_data *data;
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struct device *hwmon_dev;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -ENODEV;
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data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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mutex_init(&data->update_lock);
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data->client = client;
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hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
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client->name, data, powr1220_groups);
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return PTR_ERR_OR_ZERO(hwmon_dev);
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}
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static const struct i2c_device_id powr1220_ids[] = {
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{ "powr1220", 0, },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, powr1220_ids);
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static struct i2c_driver powr1220_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "powr1220",
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},
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.probe = powr1220_probe,
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.id_table = powr1220_ids,
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};
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module_i2c_driver(powr1220_driver);
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MODULE_AUTHOR("Scott Kanowitz");
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MODULE_DESCRIPTION("POWR1220 driver");
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MODULE_LICENSE("GPL");
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