v4.19.13 snapshot.
diff --git a/drivers/hwmon/ad7418.c b/drivers/hwmon/ad7418.c
new file mode 100644
index 0000000..a01b731
--- /dev/null
+++ b/drivers/hwmon/ad7418.c
@@ -0,0 +1,275 @@
+/*
+ * 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>
+ *
+ * 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 - version 2.
+ */
+
+#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/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 struct ad7418_data *ad7418_update_device(struct device *dev)
+{
+ struct ad7418_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
+
+ 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 */
+ cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
+ cfg &= 0x1F;
+
+ i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
+ cfg | AD7418_CH_TEMP);
+ udelay(30);
+
+ for (i = 0; i < 3; i++) {
+ data->temp[i] =
+ i2c_smbus_read_word_swapped(client,
+ AD7418_REG_TEMP[i]);
+ }
+
+ for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
+ i2c_smbus_write_byte_data(client,
+ AD7418_REG_CONF,
+ cfg | AD7418_REG_ADC_CH(ch));
+
+ udelay(15);
+ data->in[data->adc_max - 1 - i] =
+ i2c_smbus_read_word_swapped(client,
+ AD7418_REG_ADC);
+ }
+
+ /* restore old configuration value */
+ i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->lock);
+
+ return data;
+}
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct ad7418_data *data = ad7418_update_device(dev);
+ return sprintf(buf, "%d\n",
+ LM75_TEMP_FROM_REG(data->temp[attr->index]));
+}
+
+static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct ad7418_data *data = ad7418_update_device(dev);
+
+ return sprintf(buf, "%d\n",
+ ((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
+}
+
+static ssize_t set_temp(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(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
+ show_temp, set_temp, 1);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
+ show_temp, set_temp, 2);
+
+static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
+static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
+static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
+static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 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;
+ 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 struct i2c_driver ad7418_driver = {
+ .driver = {
+ .name = "ad7418",
+ },
+ .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);