diff options
Diffstat (limited to 'drivers/hwmon/powr1220.c')
| -rw-r--r-- | drivers/hwmon/powr1220.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/drivers/hwmon/powr1220.c b/drivers/hwmon/powr1220.c new file mode 100644 index 000000000000..3014e4ac741e --- /dev/null +++ b/drivers/hwmon/powr1220.c @@ -0,0 +1,391 @@ +/* + * 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"); |