339 lines
7.2 KiB
C
339 lines
7.2 KiB
C
// 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 <skanowitz@echo360.com> <scott.kanowitz@gmail.com>
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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 powr1xxx_chips { powr1014, powr1220 };
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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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u8 max_channels;
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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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static umode_t
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powr1220_is_visible(const void *data, enum hwmon_sensor_types type, u32
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attr, int channel)
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{
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struct powr1220_data *chip_data = (struct powr1220_data *)data;
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if (channel >= chip_data->max_channels)
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return 0;
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switch (type) {
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case hwmon_in:
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switch (attr) {
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case hwmon_in_input:
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case hwmon_in_highest:
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case hwmon_in_label:
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return 0444;
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default:
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break;
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}
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break;
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default:
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break;
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}
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return 0;
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}
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static int
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powr1220_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
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int channel, const char **str)
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{
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switch (type) {
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case hwmon_in:
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switch (attr) {
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case hwmon_in_label:
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*str = input_names[channel];
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return 0;
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return -EOPNOTSUPP;
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}
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static int
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powr1220_read(struct device *dev, enum hwmon_sensor_types type, u32
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attr, int channel, long *val)
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{
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struct powr1220_data *data = dev_get_drvdata(dev);
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int ret;
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switch (type) {
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case hwmon_in:
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switch (attr) {
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case hwmon_in_input:
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ret = powr1220_read_adc(dev, channel);
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if (ret < 0)
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return ret;
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*val = ret;
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break;
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case hwmon_in_highest:
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*val = data->adc_maxes[channel];
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static const struct hwmon_channel_info *powr1220_info[] = {
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HWMON_CHANNEL_INFO(in,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_HIGHEST | HWMON_I_LABEL),
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NULL
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};
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static const struct hwmon_ops powr1220_hwmon_ops = {
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.read = powr1220_read,
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.read_string = powr1220_read_string,
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.is_visible = powr1220_is_visible,
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};
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static const struct hwmon_chip_info powr1220_chip_info = {
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.ops = &powr1220_hwmon_ops,
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.info = powr1220_info,
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};
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static const struct i2c_device_id powr1220_ids[];
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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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switch (i2c_match_id(powr1220_ids, client)->driver_data) {
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case powr1014:
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data->max_channels = 10;
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break;
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default:
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data->max_channels = 12;
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break;
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}
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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_info(&client->dev,
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client->name,
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data,
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&powr1220_chip_info,
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NULL);
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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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{ "powr1014", powr1014, },
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{ "powr1220", powr1220, },
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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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