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- // 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 <[email protected]>
- *
- * Based on lm75.c
- * Copyright (C) 1998-99 Frodo Looijaard <[email protected]>
- */
- #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 */
- bool 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 = true;
- }
- mutex_unlock(&data->lock);
- return 0;
- abort:
- data->valid = false;
- 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 const struct i2c_device_id ad7418_id[];
- static int ad7418_probe(struct i2c_client *client)
- {
- 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 = i2c_match_id(ad7418_id, client)->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_new = ad7418_probe,
- .id_table = ad7418_id,
- };
- module_i2c_driver(ad7418_driver);
- MODULE_AUTHOR("Alessandro Zummo <[email protected]>");
- MODULE_DESCRIPTION("AD7416/17/18 driver");
- MODULE_LICENSE("GPL");
- MODULE_VERSION(DRV_VERSION);
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