hwmon: New driver for the National Semiconductor LM73
Adrien Demarez [Wed, 9 Dec 2009 19:35:50 +0000 (20:35 +0100)]
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>

MAINTAINERS
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/lm73.c [new file with mode: 0644]

index 83398d8..1f6155c 100644 (file)
@@ -3320,6 +3320,12 @@ S:       Maintained
 F:     Documentation/hwmon/lis3lv02d
 F:     drivers/hwmon/lis3lv02d.*
 
+LM73 HARDWARE MONITOR DRIVER
+M:     Guillaume Ligneul <guillaume.ligneul@gmail.com>
+L:     lm-sensors@lm-sensors.org
+S:     Maintained
+F:     drivers/hwmon/lm73.c
+
 LM83 HARDWARE MONITOR DRIVER
 M:     Jean Delvare <khali@linux-fr.org>
 L:     lm-sensors@lm-sensors.org
index 700e93a..87184b5 100644 (file)
@@ -442,6 +442,15 @@ config SENSORS_LM70
          This driver can also be built as a module.  If so, the module
          will be called lm70.
 
+config SENSORS_LM73
+       tristate "National Semiconductor LM73"
+       depends on I2C
+       help
+         If you say yes here you get support for National Semiconductor LM73
+         sensor chips.
+         This driver can also be built as a module.  If so, the module
+         will be called lm73.
+
 config SENSORS_LM75
        tristate "National Semiconductor LM75 and compatibles"
        depends on I2C
index 9f46cb0..a24a52d 100644 (file)
@@ -57,6 +57,7 @@ obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
 obj-$(CONFIG_SENSORS_LIS3_SPI) += lis3lv02d.o lis3lv02d_spi.o
 obj-$(CONFIG_SENSORS_LM63)     += lm63.o
 obj-$(CONFIG_SENSORS_LM70)     += lm70.o
+obj-$(CONFIG_SENSORS_LM73)     += lm73.o
 obj-$(CONFIG_SENSORS_LM75)     += lm75.o
 obj-$(CONFIG_SENSORS_LM77)     += lm77.o
 obj-$(CONFIG_SENSORS_LM78)     += lm78.o
diff --git a/drivers/hwmon/lm73.c b/drivers/hwmon/lm73.c
new file mode 100644 (file)
index 0000000..0bf8b2a
--- /dev/null
@@ -0,0 +1,205 @@
+/*
+ * 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/slab.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 };
+
+/* Insmod parameters */
+I2C_CLIENT_INSMOD_1(lm73);
+
+/* 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 /* or 0x190 after a swab16() */
+#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_data(client, attr->index, swab16(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) (swab16(i2c_smbus_read_word_data(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);
+       i2c_set_clientdata(client, NULL);
+       return 0;
+}
+
+static const struct i2c_device_id lm73_ids[] = {
+       { "lm73", lm73 },
+       { /* 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, int kind,
+                       struct i2c_board_info *info)
+{
+       struct i2c_adapter *adapter = new_client->adapter;
+       u16 id;
+       u8 ctrl;
+
+       if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
+                                       I2C_FUNC_SMBUS_WORD_DATA))
+               return -ENODEV;
+
+       /* Check device ID */
+       id = i2c_smbus_read_word_data(new_client, LM73_REG_ID);
+       ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);
+       if ((id != LM73_ID) || (ctrl & 0x10))
+               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_data   = &addr_data,
+};
+
+/* 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);