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341 lines
10 KiB
341 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 https://www.echo360.com |
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* Scott Kanowitz <[email protected]> <[email protected]> |
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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_voltage_show(struct device *dev, |
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struct device_attribute *dev_attr, |
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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_max_show(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_label_show(struct device *dev, |
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struct device_attribute *dev_attr, |
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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_RO(in0_input, powr1220_voltage, VMON1); |
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static SENSOR_DEVICE_ATTR_RO(in1_input, powr1220_voltage, VMON2); |
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static SENSOR_DEVICE_ATTR_RO(in2_input, powr1220_voltage, VMON3); |
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static SENSOR_DEVICE_ATTR_RO(in3_input, powr1220_voltage, VMON4); |
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static SENSOR_DEVICE_ATTR_RO(in4_input, powr1220_voltage, VMON5); |
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static SENSOR_DEVICE_ATTR_RO(in5_input, powr1220_voltage, VMON6); |
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static SENSOR_DEVICE_ATTR_RO(in6_input, powr1220_voltage, VMON7); |
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static SENSOR_DEVICE_ATTR_RO(in7_input, powr1220_voltage, VMON8); |
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static SENSOR_DEVICE_ATTR_RO(in8_input, powr1220_voltage, VMON9); |
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static SENSOR_DEVICE_ATTR_RO(in9_input, powr1220_voltage, VMON10); |
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static SENSOR_DEVICE_ATTR_RO(in10_input, powr1220_voltage, VMON11); |
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static SENSOR_DEVICE_ATTR_RO(in11_input, powr1220_voltage, VMON12); |
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static SENSOR_DEVICE_ATTR_RO(in12_input, powr1220_voltage, VCCA); |
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static SENSOR_DEVICE_ATTR_RO(in13_input, powr1220_voltage, VCCINP); |
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static SENSOR_DEVICE_ATTR_RO(in0_highest, powr1220_max, VMON1); |
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static SENSOR_DEVICE_ATTR_RO(in1_highest, powr1220_max, VMON2); |
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static SENSOR_DEVICE_ATTR_RO(in2_highest, powr1220_max, VMON3); |
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static SENSOR_DEVICE_ATTR_RO(in3_highest, powr1220_max, VMON4); |
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static SENSOR_DEVICE_ATTR_RO(in4_highest, powr1220_max, VMON5); |
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static SENSOR_DEVICE_ATTR_RO(in5_highest, powr1220_max, VMON6); |
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static SENSOR_DEVICE_ATTR_RO(in6_highest, powr1220_max, VMON7); |
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static SENSOR_DEVICE_ATTR_RO(in7_highest, powr1220_max, VMON8); |
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static SENSOR_DEVICE_ATTR_RO(in8_highest, powr1220_max, VMON9); |
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static SENSOR_DEVICE_ATTR_RO(in9_highest, powr1220_max, VMON10); |
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static SENSOR_DEVICE_ATTR_RO(in10_highest, powr1220_max, VMON11); |
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static SENSOR_DEVICE_ATTR_RO(in11_highest, powr1220_max, VMON12); |
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static SENSOR_DEVICE_ATTR_RO(in12_highest, powr1220_max, VCCA); |
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static SENSOR_DEVICE_ATTR_RO(in13_highest, powr1220_max, VCCINP); |
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static SENSOR_DEVICE_ATTR_RO(in0_label, powr1220_label, VMON1); |
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static SENSOR_DEVICE_ATTR_RO(in1_label, powr1220_label, VMON2); |
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static SENSOR_DEVICE_ATTR_RO(in2_label, powr1220_label, VMON3); |
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static SENSOR_DEVICE_ATTR_RO(in3_label, powr1220_label, VMON4); |
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static SENSOR_DEVICE_ATTR_RO(in4_label, powr1220_label, VMON5); |
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static SENSOR_DEVICE_ATTR_RO(in5_label, powr1220_label, VMON6); |
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static SENSOR_DEVICE_ATTR_RO(in6_label, powr1220_label, VMON7); |
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static SENSOR_DEVICE_ATTR_RO(in7_label, powr1220_label, VMON8); |
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static SENSOR_DEVICE_ATTR_RO(in8_label, powr1220_label, VMON9); |
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static SENSOR_DEVICE_ATTR_RO(in9_label, powr1220_label, VMON10); |
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static SENSOR_DEVICE_ATTR_RO(in10_label, powr1220_label, VMON11); |
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static SENSOR_DEVICE_ATTR_RO(in11_label, powr1220_label, VMON12); |
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static SENSOR_DEVICE_ATTR_RO(in12_label, powr1220_label, VCCA); |
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static SENSOR_DEVICE_ATTR_RO(in13_label, powr1220_label, 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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{ |
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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_new = 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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