| /* |
| * 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; |
| } |
| |
| /* 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); |
| } |
| |
| /* 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]); |
| } |
| |
| /* 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]); |
| } |
| |
| 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); |
| } |
| |
| 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"); |