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Diffstat (limited to 'drivers/hwmon/max6642.c')
-rw-r--r--drivers/hwmon/max6642.c314
1 files changed, 0 insertions, 314 deletions
diff --git a/drivers/hwmon/max6642.c b/drivers/hwmon/max6642.c
deleted file mode 100644
index 9302ab233910..000000000000
--- a/drivers/hwmon/max6642.c
+++ /dev/null
@@ -1,314 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Driver for +/-1 degree C, SMBus-Compatible Remote/Local Temperature Sensor
- * with Overtemperature Alarm
- *
- * Copyright (C) 2011 AppearTV AS
- *
- * Derived from:
- *
- * Based on the max1619 driver.
- * Copyright (C) 2003-2004 Oleksij Rempel <bug-track@fisher-privat.net>
- * Jean Delvare <jdelvare@suse.de>
- *
- * The MAX6642 is a sensor chip made by Maxim.
- * It reports up to two temperatures (its own plus up to
- * one external one). Complete datasheet can be
- * obtained from Maxim's website at:
- * http://datasheets.maxim-ic.com/en/ds/MAX6642.pdf
- */
-
-
-#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/sysfs.h>
-
-static const unsigned short normal_i2c[] = {
- 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
-
-/*
- * The MAX6642 registers
- */
-
-#define MAX6642_REG_R_MAN_ID 0xFE
-#define MAX6642_REG_R_CONFIG 0x03
-#define MAX6642_REG_W_CONFIG 0x09
-#define MAX6642_REG_R_STATUS 0x02
-#define MAX6642_REG_R_LOCAL_TEMP 0x00
-#define MAX6642_REG_R_LOCAL_TEMPL 0x11
-#define MAX6642_REG_R_LOCAL_HIGH 0x05
-#define MAX6642_REG_W_LOCAL_HIGH 0x0B
-#define MAX6642_REG_R_REMOTE_TEMP 0x01
-#define MAX6642_REG_R_REMOTE_TEMPL 0x10
-#define MAX6642_REG_R_REMOTE_HIGH 0x07
-#define MAX6642_REG_W_REMOTE_HIGH 0x0D
-
-/*
- * Conversions
- */
-
-static int temp_from_reg10(int val)
-{
- return val * 250;
-}
-
-static int temp_from_reg(int val)
-{
- return val * 1000;
-}
-
-static int temp_to_reg(int val)
-{
- return val / 1000;
-}
-
-/*
- * Client data (each client gets its own)
- */
-
-struct max6642_data {
- struct i2c_client *client;
- struct mutex update_lock;
- bool valid; /* zero until following fields are valid */
- unsigned long last_updated; /* in jiffies */
-
- /* registers values */
- u16 temp_input[2]; /* local/remote */
- u16 temp_high[2]; /* local/remote */
- u8 alarms;
-};
-
-/*
- * Real code
- */
-
-static void max6642_init_client(struct max6642_data *data,
- struct i2c_client *client)
-{
- u8 config;
-
- /*
- * Start the conversions.
- */
- config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
- if (config & 0x40)
- i2c_smbus_write_byte_data(client, MAX6642_REG_W_CONFIG,
- config & 0xBF); /* run */
-
- data->temp_high[0] = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_LOCAL_HIGH);
- data->temp_high[1] = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_REMOTE_HIGH);
-}
-
-/* Return 0 if detection is successful, -ENODEV otherwise */
-static int max6642_detect(struct i2c_client *client,
- struct i2c_board_info *info)
-{
- struct i2c_adapter *adapter = client->adapter;
- u8 reg_config, reg_status, man_id;
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
- return -ENODEV;
-
- /* identification */
- man_id = i2c_smbus_read_byte_data(client, MAX6642_REG_R_MAN_ID);
- if (man_id != 0x4D)
- return -ENODEV;
-
- /* sanity check */
- if (i2c_smbus_read_byte_data(client, 0x04) != 0x4D
- || i2c_smbus_read_byte_data(client, 0x06) != 0x4D
- || i2c_smbus_read_byte_data(client, 0xff) != 0x4D)
- return -ENODEV;
-
- /*
- * We read the config and status register, the 4 lower bits in the
- * config register should be zero and bit 5, 3, 1 and 0 should be
- * zero in the status register.
- */
- reg_config = i2c_smbus_read_byte_data(client, MAX6642_REG_R_CONFIG);
- if ((reg_config & 0x0f) != 0x00)
- return -ENODEV;
-
- /* in between, another round of sanity checks */
- if (i2c_smbus_read_byte_data(client, 0x04) != reg_config
- || i2c_smbus_read_byte_data(client, 0x06) != reg_config
- || i2c_smbus_read_byte_data(client, 0xff) != reg_config)
- return -ENODEV;
-
- reg_status = i2c_smbus_read_byte_data(client, MAX6642_REG_R_STATUS);
- if ((reg_status & 0x2b) != 0x00)
- return -ENODEV;
-
- strscpy(info->type, "max6642", I2C_NAME_SIZE);
-
- return 0;
-}
-
-static struct max6642_data *max6642_update_device(struct device *dev)
-{
- struct max6642_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
- u16 val, tmp;
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
- dev_dbg(dev, "Updating max6642 data.\n");
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_LOCAL_TEMPL);
- tmp = (val >> 6) & 3;
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_LOCAL_TEMP);
- val = (val << 2) | tmp;
- data->temp_input[0] = val;
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_REMOTE_TEMPL);
- tmp = (val >> 6) & 3;
- val = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_REMOTE_TEMP);
- val = (val << 2) | tmp;
- data->temp_input[1] = val;
- data->alarms = i2c_smbus_read_byte_data(client,
- MAX6642_REG_R_STATUS);
-
- data->last_updated = jiffies;
- data->valid = true;
- }
-
- mutex_unlock(&data->update_lock);
-
- return data;
-}
-
-/*
- * Sysfs stuff
- */
-
-static ssize_t temp_max10_show(struct device *dev,
- struct device_attribute *dev_attr, char *buf)
-{
- struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
- struct max6642_data *data = max6642_update_device(dev);
-
- return sprintf(buf, "%d\n",
- temp_from_reg10(data->temp_input[attr->index]));
-}
-
-static ssize_t temp_max_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
- struct max6642_data *data = max6642_update_device(dev);
-
- return sprintf(buf, "%d\n", temp_from_reg(data->temp_high[attr2->nr]));
-}
-
-static ssize_t temp_max_store(struct device *dev,
- struct device_attribute *attr, const char *buf,
- size_t count)
-{
- struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
- struct max6642_data *data = dev_get_drvdata(dev);
- unsigned long val;
- int err;
-
- err = kstrtoul(buf, 10, &val);
- if (err < 0)
- return err;
-
- mutex_lock(&data->update_lock);
- data->temp_high[attr2->nr] = clamp_val(temp_to_reg(val), 0, 255);
- i2c_smbus_write_byte_data(data->client, attr2->index,
- data->temp_high[attr2->nr]);
- mutex_unlock(&data->update_lock);
- return count;
-}
-
-static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- int bitnr = to_sensor_dev_attr(attr)->index;
- struct max6642_data *data = max6642_update_device(dev);
- return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
-}
-
-static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_max10, 0);
-static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_max10, 1);
-static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp_max, 0,
- MAX6642_REG_W_LOCAL_HIGH);
-static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp_max, 1,
- MAX6642_REG_W_REMOTE_HIGH);
-static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 2);
-static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 6);
-static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 4);
-
-static struct attribute *max6642_attrs[] = {
- &sensor_dev_attr_temp1_input.dev_attr.attr,
- &sensor_dev_attr_temp2_input.dev_attr.attr,
- &sensor_dev_attr_temp1_max.dev_attr.attr,
- &sensor_dev_attr_temp2_max.dev_attr.attr,
-
- &sensor_dev_attr_temp2_fault.dev_attr.attr,
- &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
- &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
- NULL
-};
-ATTRIBUTE_GROUPS(max6642);
-
-static int max6642_probe(struct i2c_client *client)
-{
- struct device *dev = &client->dev;
- struct max6642_data *data;
- struct device *hwmon_dev;
-
- data = devm_kzalloc(dev, sizeof(struct max6642_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
- data->client = client;
- mutex_init(&data->update_lock);
-
- /* Initialize the MAX6642 chip */
- max6642_init_client(data, client);
-
- hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
- client->name, data,
- max6642_groups);
- return PTR_ERR_OR_ZERO(hwmon_dev);
-}
-
-/*
- * Driver data (common to all clients)
- */
-
-static const struct i2c_device_id max6642_id[] = {
- { "max6642" },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, max6642_id);
-
-static struct i2c_driver max6642_driver = {
- .class = I2C_CLASS_HWMON,
- .driver = {
- .name = "max6642",
- },
- .probe = max6642_probe,
- .id_table = max6642_id,
- .detect = max6642_detect,
- .address_list = normal_i2c,
-};
-
-module_i2c_driver(max6642_driver);
-
-MODULE_AUTHOR("Per Dalen <per.dalen@appeartv.com>");
-MODULE_DESCRIPTION("MAX6642 sensor driver");
-MODULE_LICENSE("GPL");
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