hwmon: New driver for the National Semiconductor LM73
The National Semiconductor LM73 is a single temperature sensor, much like the famous LM75. Signed-off-by: Adrien Demarez <adrien.demarez@bolloretelecom.eu> Signed-off-by: Jean Delvare <khali@linux-fr.org>hifive-unleashed-5.1
Adrien Demarez
Jean Delvare
parent
b72656dbc4
commit
4e233cbed2
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@ -3320,6 +3320,12 @@ S: Maintained
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F: Documentation/hwmon/lis3lv02d
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F: drivers/hwmon/lis3lv02d.*
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LM73 HARDWARE MONITOR DRIVER
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M: Guillaume Ligneul <guillaume.ligneul@gmail.com>
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L: lm-sensors@lm-sensors.org
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S: Maintained
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F: drivers/hwmon/lm73.c
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LM83 HARDWARE MONITOR DRIVER
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M: Jean Delvare <khali@linux-fr.org>
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L: lm-sensors@lm-sensors.org
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@ -442,6 +442,15 @@ config SENSORS_LM70
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This driver can also be built as a module. If so, the module
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will be called lm70.
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config SENSORS_LM73
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tristate "National Semiconductor LM73"
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depends on I2C
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help
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If you say yes here you get support for National Semiconductor LM73
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sensor chips.
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This driver can also be built as a module. If so, the module
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will be called lm73.
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config SENSORS_LM75
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tristate "National Semiconductor LM75 and compatibles"
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depends on I2C
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@ -57,6 +57,7 @@ obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
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obj-$(CONFIG_SENSORS_LIS3_SPI) += lis3lv02d.o lis3lv02d_spi.o
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obj-$(CONFIG_SENSORS_LM63) += lm63.o
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obj-$(CONFIG_SENSORS_LM70) += lm70.o
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obj-$(CONFIG_SENSORS_LM73) += lm73.o
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obj-$(CONFIG_SENSORS_LM75) += lm75.o
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obj-$(CONFIG_SENSORS_LM77) += lm77.o
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obj-$(CONFIG_SENSORS_LM78) += lm78.o
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@ -0,0 +1,205 @@
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/*
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* LM73 Sensor driver
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* Based on LM75
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*
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* Copyright (C) 2007, CenoSYS (www.cenosys.com).
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* Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu).
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*
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* Guillaume Ligneul <guillaume.ligneul@gmail.com>
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* Adrien Demarez <adrien.demarez@bolloretelecom.eu>
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* Jeremy Laine <jeremy.laine@bolloretelecom.eu>
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*
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* This software program is licensed subject to the GNU General Public License
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* (GPL).Version 2,June 1991, available at
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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/* Addresses scanned */
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
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0x4d, 0x4e, I2C_CLIENT_END };
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/* Insmod parameters */
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I2C_CLIENT_INSMOD_1(lm73);
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/* LM73 registers */
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#define LM73_REG_INPUT 0x00
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#define LM73_REG_CONF 0x01
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#define LM73_REG_MAX 0x02
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#define LM73_REG_MIN 0x03
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#define LM73_REG_CTRL 0x04
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#define LM73_REG_ID 0x07
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#define LM73_ID 0x9001 /* or 0x190 after a swab16() */
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#define DRVNAME "lm73"
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#define LM73_TEMP_MIN (-40)
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#define LM73_TEMP_MAX 150
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/*-----------------------------------------------------------------------*/
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static ssize_t set_temp(struct device *dev, struct device_attribute *da,
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const char *buf, size_t count)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct i2c_client *client = to_i2c_client(dev);
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long temp;
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short value;
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int status = strict_strtol(buf, 10, &temp);
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if (status < 0)
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return status;
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/* Write value */
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value = (short) SENSORS_LIMIT(temp/250, (LM73_TEMP_MIN*4),
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(LM73_TEMP_MAX*4)) << 5;
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i2c_smbus_write_word_data(client, attr->index, swab16(value));
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return count;
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}
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static ssize_t show_temp(struct device *dev, struct device_attribute *da,
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char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
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struct i2c_client *client = to_i2c_client(dev);
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/* use integer division instead of equivalent right shift to
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guarantee arithmetic shift and preserve the sign */
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int temp = ((s16) (swab16(i2c_smbus_read_word_data(client,
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attr->index)))*250) / 32;
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return sprintf(buf, "%d\n", temp);
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}
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/*-----------------------------------------------------------------------*/
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/* sysfs attributes for hwmon */
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
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show_temp, set_temp, LM73_REG_MAX);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
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show_temp, set_temp, LM73_REG_MIN);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
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show_temp, NULL, LM73_REG_INPUT);
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static struct attribute *lm73_attributes[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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NULL
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};
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static const struct attribute_group lm73_group = {
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.attrs = lm73_attributes,
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};
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/*-----------------------------------------------------------------------*/
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/* device probe and removal */
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static int
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lm73_probe(struct i2c_client *client, const struct i2c_device_id *id)
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{
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struct device *hwmon_dev;
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int status;
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/* Register sysfs hooks */
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status = sysfs_create_group(&client->dev.kobj, &lm73_group);
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if (status)
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return status;
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hwmon_dev = hwmon_device_register(&client->dev);
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if (IS_ERR(hwmon_dev)) {
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status = PTR_ERR(hwmon_dev);
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goto exit_remove;
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}
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i2c_set_clientdata(client, hwmon_dev);
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dev_info(&client->dev, "%s: sensor '%s'\n",
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dev_name(hwmon_dev), client->name);
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return 0;
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exit_remove:
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sysfs_remove_group(&client->dev.kobj, &lm73_group);
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return status;
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}
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static int lm73_remove(struct i2c_client *client)
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{
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struct device *hwmon_dev = i2c_get_clientdata(client);
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hwmon_device_unregister(hwmon_dev);
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sysfs_remove_group(&client->dev.kobj, &lm73_group);
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i2c_set_clientdata(client, NULL);
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return 0;
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}
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static const struct i2c_device_id lm73_ids[] = {
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{ "lm73", lm73 },
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{ /* LIST END */ }
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};
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MODULE_DEVICE_TABLE(i2c, lm73_ids);
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/* Return 0 if detection is successful, -ENODEV otherwise */
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static int lm73_detect(struct i2c_client *new_client, int kind,
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struct i2c_board_info *info)
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{
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struct i2c_adapter *adapter = new_client->adapter;
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u16 id;
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u8 ctrl;
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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/* Check device ID */
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id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
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ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
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if ((id != LM73_ID) || (ctrl & 0x10))
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return -ENODEV;
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strlcpy(info->type, "lm73", I2C_NAME_SIZE);
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return 0;
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}
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static struct i2c_driver lm73_driver = {
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.class = I2C_CLASS_HWMON,
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.driver = {
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.name = "lm73",
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},
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.probe = lm73_probe,
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.remove = lm73_remove,
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.id_table = lm73_ids,
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.detect = lm73_detect,
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.address_data = &addr_data,
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};
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/* module glue */
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static int __init sensors_lm73_init(void)
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{
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return i2c_add_driver(&lm73_driver);
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}
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static void __exit sensors_lm73_exit(void)
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{
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i2c_del_driver(&lm73_driver);
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}
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MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>");
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MODULE_DESCRIPTION("LM73 driver");
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MODULE_LICENSE("GPL");
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module_init(sensors_lm73_init);
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module_exit(sensors_lm73_exit);
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