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-rw-r--r--drivers/hwmon/ad7418.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/hwmon/ad7418.c b/drivers/hwmon/ad7418.c
new file mode 100644
index 0000000000..4829f83ff5
--- /dev/null
+++ b/drivers/hwmon/ad7418.c
@@ -0,0 +1,318 @@
+// 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.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 = (uintptr_t)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 = 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 21:28:23 +0000