// SPDX-License-Identifier: GPL-2.0-only /* * An hwmon driver for the Analog Devices AD7416/17/18 * Copyright (C) 2006-07 Tower Technologies * * Author: Alessandro Zummo <a.zummo@towertech.it> * * Based on lm75.c * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> */ #include <linux/module.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/of_device.h> #include <linux/delay.h> #include <linux/slab.h> #include "lm75.h" #define DRV_VERSION "0.4" enum chips { ad7416, ad7417, ad7418 }; /* AD7418 registers */ #define AD7418_REG_TEMP_IN 0x00 #define AD7418_REG_CONF 0x01 #define AD7418_REG_TEMP_HYST 0x02 #define AD7418_REG_TEMP_OS 0x03 #define AD7418_REG_ADC 0x04 #define AD7418_REG_CONF2 0x05 #define AD7418_REG_ADC_CH(x) ((x) << 5) #define AD7418_CH_TEMP AD7418_REG_ADC_CH(0) static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN, AD7418_REG_TEMP_HYST, AD7418_REG_TEMP_OS }; struct ad7418_data { struct i2c_client *client; enum chips type; struct mutex lock; int adc_max; /* number of ADC channels */ char valid; unsigned long last_updated; /* In jiffies */ s16 temp[3]; /* Register values */ u16 in[4]; }; static int ad7418_update_device(struct device *dev) { struct ad7418_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; s32 val; mutex_lock(&data->lock); if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || !data->valid) { u8 cfg; int i, ch; /* read config register and clear channel bits */ val = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); if (val < 0) goto abort; cfg = val; cfg &= 0x1F; val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, cfg | AD7418_CH_TEMP); if (val < 0) goto abort; udelay(30); for (i = 0; i < 3; i++) { val = i2c_smbus_read_word_swapped(client, AD7418_REG_TEMP[i]); if (val < 0) goto abort; data->temp[i] = val; } for (i = 0, ch = 4; i < data->adc_max; i++, ch--) { val = i2c_smbus_write_byte_data(client, AD7418_REG_CONF, cfg | AD7418_REG_ADC_CH(ch)); if (val < 0) goto abort; udelay(15); val = i2c_smbus_read_word_swapped(client, AD7418_REG_ADC); if (val < 0) goto abort; data->in[data->adc_max - 1 - i] = val; } /* restore old configuration value */ val = i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg); if (val < 0) goto abort; data->last_updated = jiffies; data->valid = 1; } mutex_unlock(&data->lock); return 0; abort: data->valid = 0; mutex_unlock(&data->lock); return val; } static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct ad7418_data *data = dev_get_drvdata(dev); int ret; ret = ad7418_update_device(dev); if (ret < 0) return ret; return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->temp[attr->index])); } static ssize_t adc_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct ad7418_data *data = dev_get_drvdata(dev); int ret; ret = ad7418_update_device(dev); if (ret < 0) return ret; return sprintf(buf, "%d\n", ((data->in[attr->index] >> 6) * 2500 + 512) / 1024); } static ssize_t temp_store(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct ad7418_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; long temp; int ret = kstrtol(buf, 10, &temp); if (ret < 0) return ret; mutex_lock(&data->lock); data->temp[attr->index] = LM75_TEMP_TO_REG(temp); i2c_smbus_write_word_swapped(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]); mutex_unlock(&data->lock); return count; } static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, temp, 1); static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2); static SENSOR_DEVICE_ATTR_RO(in1_input, adc, 0); static SENSOR_DEVICE_ATTR_RO(in2_input, adc, 1); static SENSOR_DEVICE_ATTR_RO(in3_input, adc, 2); static SENSOR_DEVICE_ATTR_RO(in4_input, adc, 3); static struct attribute *ad7416_attrs[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(ad7416); static struct attribute *ad7417_attrs[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, &sensor_dev_attr_temp1_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, NULL }; ATTRIBUTE_GROUPS(ad7417); static struct attribute *ad7418_attrs[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(ad7418); static void ad7418_init_client(struct i2c_client *client) { struct ad7418_data *data = i2c_get_clientdata(client); int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF); if (reg < 0) { dev_err(&client->dev, "cannot read configuration register\n"); } else { dev_info(&client->dev, "configuring for mode 1\n"); i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe); if (data->type == ad7417 || data->type == ad7418) i2c_smbus_write_byte_data(client, AD7418_REG_CONF2, 0x00); } } static int ad7418_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct i2c_adapter *adapter = client->adapter; struct ad7418_data *data; struct device *hwmon_dev; const struct attribute_group **attr_groups = NULL; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) return -EOPNOTSUPP; data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL); if (!data) return -ENOMEM; i2c_set_clientdata(client, data); mutex_init(&data->lock); data->client = client; if (dev->of_node) data->type = (enum chips)of_device_get_match_data(dev); else data->type = id->driver_data; switch (data->type) { case ad7416: data->adc_max = 0; attr_groups = ad7416_groups; break; case ad7417: data->adc_max = 4; attr_groups = ad7417_groups; break; case ad7418: data->adc_max = 1; attr_groups = ad7418_groups; break; } dev_info(dev, "%s chip found\n", client->name); /* Initialize the AD7418 chip */ ad7418_init_client(client); hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, attr_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id ad7418_id[] = { { "ad7416", ad7416 }, { "ad7417", ad7417 }, { "ad7418", ad7418 }, { } }; MODULE_DEVICE_TABLE(i2c, ad7418_id); static const struct of_device_id ad7418_dt_ids[] = { { .compatible = "adi,ad7416", .data = (void *)ad7416, }, { .compatible = "adi,ad7417", .data = (void *)ad7417, }, { .compatible = "adi,ad7418", .data = (void *)ad7418, }, { } }; MODULE_DEVICE_TABLE(of, ad7418_dt_ids); static struct i2c_driver ad7418_driver = { .driver = { .name = "ad7418", .of_match_table = ad7418_dt_ids, }, .probe = ad7418_probe, .id_table = ad7418_id, }; module_i2c_driver(ad7418_driver); MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); MODULE_DESCRIPTION("AD7416/17/18 driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRV_VERSION);