/* * LM73 Sensor driver * Based on LM75 * * Copyright (C) 2007, CenoSYS (www.cenosys.com). * Copyright (C) 2009, Bollore telecom (www.bolloretelecom.eu). * * Guillaume Ligneul <guillaume.ligneul@gmail.com> * Adrien Demarez <adrien.demarez@bolloretelecom.eu> * Jeremy Laine <jeremy.laine@bolloretelecom.eu> * * This software program is licensed subject to the GNU General Public License * (GPL).Version 2,June 1991, available at * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html */ #include <linux/module.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> /* Addresses scanned */ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; /* LM73 registers */ #define LM73_REG_INPUT 0x00 #define LM73_REG_CONF 0x01 #define LM73_REG_MAX 0x02 #define LM73_REG_MIN 0x03 #define LM73_REG_CTRL 0x04 #define LM73_REG_ID 0x07 #define LM73_ID 0x9001 /* 0x0190, byte-swapped */ #define DRVNAME "lm73" #define LM73_TEMP_MIN (-40) #define LM73_TEMP_MAX 150 /*-----------------------------------------------------------------------*/ static ssize_t set_temp(struct device *dev, struct device_attribute *da, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct i2c_client *client = to_i2c_client(dev); long temp; short value; int status = strict_strtol(buf, 10, &temp); if (status < 0) return status; /* Write value */ value = (short) SENSORS_LIMIT(temp/250, (LM73_TEMP_MIN*4), (LM73_TEMP_MAX*4)) << 5; i2c_smbus_write_word_swapped(client, attr->index, value); return count; } static ssize_t show_temp(struct device *dev, struct device_attribute *da, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(da); struct i2c_client *client = to_i2c_client(dev); /* use integer division instead of equivalent right shift to guarantee arithmetic shift and preserve the sign */ int temp = ((s16) (i2c_smbus_read_word_swapped(client, attr->index))*250) / 32; return sprintf(buf, "%d\n", temp); } /*-----------------------------------------------------------------------*/ /* sysfs attributes for hwmon */ static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, LM73_REG_MAX); static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, LM73_REG_MIN); static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, LM73_REG_INPUT); static struct attribute *lm73_attributes[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, NULL }; static const struct attribute_group lm73_group = { .attrs = lm73_attributes, }; /*-----------------------------------------------------------------------*/ /* device probe and removal */ static int lm73_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *hwmon_dev; int status; /* Register sysfs hooks */ status = sysfs_create_group(&client->dev.kobj, &lm73_group); if (status) return status; hwmon_dev = hwmon_device_register(&client->dev); if (IS_ERR(hwmon_dev)) { status = PTR_ERR(hwmon_dev); goto exit_remove; } i2c_set_clientdata(client, hwmon_dev); dev_info(&client->dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); return 0; exit_remove: sysfs_remove_group(&client->dev.kobj, &lm73_group); return status; } static int lm73_remove(struct i2c_client *client) { struct device *hwmon_dev = i2c_get_clientdata(client); hwmon_device_unregister(hwmon_dev); sysfs_remove_group(&client->dev.kobj, &lm73_group); return 0; } static const struct i2c_device_id lm73_ids[] = { { "lm73", 0 }, { /* LIST END */ } }; MODULE_DEVICE_TABLE(i2c, lm73_ids); /* Return 0 if detection is successful, -ENODEV otherwise */ static int lm73_detect(struct i2c_client *new_client, struct i2c_board_info *info) { struct i2c_adapter *adapter = new_client->adapter; int id, ctrl, conf; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) return -ENODEV; /* * Do as much detection as possible with byte reads first, as word * reads can confuse other devices. */ ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL); if (ctrl < 0 || (ctrl & 0x10)) return -ENODEV; conf = i2c_smbus_read_byte_data(new_client, LM73_REG_CONF); if (conf < 0 || (conf & 0x0c)) return -ENODEV; id = i2c_smbus_read_byte_data(new_client, LM73_REG_ID); if (id < 0 || id != (LM73_ID & 0xff)) return -ENODEV; /* Check device ID */ id = i2c_smbus_read_word_data(new_client, LM73_REG_ID); if (id < 0 || id != LM73_ID) return -ENODEV; strlcpy(info->type, "lm73", I2C_NAME_SIZE); return 0; } static struct i2c_driver lm73_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "lm73", }, .probe = lm73_probe, .remove = lm73_remove, .id_table = lm73_ids, .detect = lm73_detect, .address_list = normal_i2c, }; /* module glue */ static int __init sensors_lm73_init(void) { return i2c_add_driver(&lm73_driver); } static void __exit sensors_lm73_exit(void) { i2c_del_driver(&lm73_driver); } MODULE_AUTHOR("Guillaume Ligneul <guillaume.ligneul@gmail.com>"); MODULE_DESCRIPTION("LM73 driver"); MODULE_LICENSE("GPL"); module_init(sensors_lm73_init); module_exit(sensors_lm73_exit);