[lm-sensors] [PATCH] ad7414 driver

[Sean MacLennan <seanm@seanm.ca>]

This is a driver for the ad7414 temperature chip.

The driver has been through at least two reviews that I know of. It is
also in production use on the PIKA Warp Appliance.

Cheers,
   Sean

Signed-off-by: Sean MacLennan <smaclennan@pikatech.com>
---
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 00ff533..3c21d57 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -57,6 +57,16 @@ config SENSORS_ABITUGURU3
 	  This driver can also be built as a module.  If so, the module
 	  will be called abituguru3.
 
+config SENSORS_AD7414
+	tristate "Analog Devices AD7414"
+	depends on I2C && EXPERIMENTAL
+	help
+	  If you say yes here you get support for the Analog Devices
+	  AD7414 temperature monitoring chip.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called ad7414.
+
 config SENSORS_AD7418
 	tristate "Analog Devices AD7416, AD7417 and AD7418"
 	depends on I2C && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index d098677..7943e5c 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_SENSORS_W83791D)	+= w83791d.o
 
 obj-$(CONFIG_SENSORS_ABITUGURU)	+= abituguru.o
 obj-$(CONFIG_SENSORS_ABITUGURU3)+= abituguru3.o
+obj-$(CONFIG_SENSORS_AD7414)	+= ad7414.o
 obj-$(CONFIG_SENSORS_AD7418)	+= ad7418.o
 obj-$(CONFIG_SENSORS_ADM1021)	+= adm1021.o
 obj-$(CONFIG_SENSORS_ADM1025)	+= adm1025.o
diff --git a/drivers/hwmon/ad7414.c b/drivers/hwmon/ad7414.c
new file mode 100644
index 0000000..e357f4f
--- /dev/null
+++ b/drivers/hwmon/ad7414.c
@@ -0,0 +1,259 @@
+/*
+ * An hwmon driver for the Analog Devices AD7414
+ *
+ * Copyright 2006 Stefan Roese <sr at denx.de>, DENX Software Engineering
+ *
+ * Copyright (c) 2008 PIKA Technologies
+ *   Sean MacLennan <smaclennan@pikatech.com>
+ *
+ * Copyright (c) 2008 Spansion Inc.
+ *   Frank Edelhaeuser <frank.edelhaeuser at spansion.com>
+ *   (converted to "new style" I2C driver model, removed checkpatch.pl warnings)
+ *
+ * Based on ad7418.c
+ * Copyright 2006 Tower Technologies, Alessandro Zummo <a.zummo at towertech.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/delay.h>
+
+
+#define DRV_VERSION "0.3"
+
+/* straight from the datasheet */
+#define AD7414_TEMP_MIN (-55000)
+#define AD7414_TEMP_MAX 125000
+
+/* AD7414 registers */
+#define AD7414_REG_TEMP		0x00
+#define AD7414_REG_CONF		0x01
+#define AD7414_REG_T_HIGH	0x02
+#define AD7414_REG_T_LOW	0x03
+
+
+struct ad7414_data {
+	struct i2c_client	client;
+	struct device		*dev;
+	struct mutex		lock;	/* atomic read data updates */
+	char			valid;	/* !=0 if following fields are valid */
+	unsigned long		last_updated;	/* In jiffies */
+	u16			temp_input;	/* Register values */
+	u8			temp_max;
+	u8			temp_min;
+	u8			temp_alert;
+	u8			temp_max_flag;
+	u8			temp_min_flag;
+};
+
+/*
+ * TEMP: 0.001C/bit (-55C to +125C)
+ * REG: (0.5C/bit, two's complement) << 7
+ */
+static inline int AD7414_TEMP_FROM_REG(u16 reg)
+{
+	/* use integer division instead of equivalent right shift to
+	 * guarantee arithmetic shift and preserve the sign
+	 */
+	return ((s16)reg / 128) * 500;
+}
+
+/* All registers are word-sized, except for the configuration registers.
+ * AD7414 uses a high-byte first convention, which is exactly opposite to
+ * the usual practice.
+ */
+static int ad7414_read(struct i2c_client *client, u8 reg)
+{
+	if (reg = AD7414_REG_TEMP)
+		return swab16(i2c_smbus_read_word_data(client, reg));
+	else
+		return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int ad7414_write(struct i2c_client *client, u8 reg, u16 value)
+{
+	return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+struct ad7414_data *ad7414_update_device(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct ad7414_data *data = i2c_get_clientdata(client);
+
+	mutex_lock(&data->lock);
+
+	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+		|| !data->valid) {
+		dev_dbg(&client->dev, "starting ad7414 update\n");
+
+		data->temp_input = ad7414_read(client, AD7414_REG_TEMP);
+		data->temp_alert = (data->temp_input >> 5) & 0x01;
+		data->temp_max_flag = (data->temp_input >> 4) & 0x01;
+		data->temp_min_flag = (data->temp_input >> 3) & 0x01;
+		data->temp_max = ad7414_read(client, AD7414_REG_T_HIGH);
+		data->temp_min = ad7414_read(client, AD7414_REG_T_LOW);
+
+		data->last_updated = jiffies;
+		data->valid = 1;
+	}
+
+	mutex_unlock(&data->lock);
+
+	return data;
+}
+
+#define show(value)				\
+static ssize_t show_##value(struct device *dev, \
+	struct device_attribute *attr, char *buf)		\
+{ \
+	struct ad7414_data *data = ad7414_update_device(dev); \
+	return sprintf(buf, "%d\n", AD7414_TEMP_FROM_REG(data->value)); \
+}
+show(temp_input);
+
+#define show_8(value)	\
+static ssize_t show_##value(struct device *dev, \
+	struct device_attribute *attr, char *buf)		\
+{								\
+	struct ad7414_data *data = ad7414_update_device(dev);	\
+	return sprintf(buf, "%d\n", data->value);		\
+}
+show_8(temp_max);
+show_8(temp_min);
+show_8(temp_alert);
+show_8(temp_max_flag);
+show_8(temp_min_flag);
+
+#define set(value, reg)	\
+static ssize_t set_##value(struct device *dev, \
+	struct device_attribute *attr, \
+	const char *buf, size_t count)	\
+{								\
+	struct i2c_client *client = to_i2c_client(dev);		\
+	struct ad7414_data *data = i2c_get_clientdata(client);	\
+	int temp = simple_strtoul(buf, NULL, 10);		\
+								\
+	mutex_lock(&data->lock);				\
+	data->value = temp;					\
+	ad7414_write(client, reg, data->value);			\
+	mutex_unlock(&data->lock);				\
+	return count;						\
+}
+set(temp_max, AD7414_REG_T_HIGH);
+set(temp_min, AD7414_REG_T_LOW);
+
+static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
+static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min, set_temp_min);
+static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL);
+static DEVICE_ATTR(temp1_alert, S_IRUGO, show_temp_alert, NULL);
+static DEVICE_ATTR(temp1_max_flag, S_IRUGO, show_temp_max_flag, NULL);
+static DEVICE_ATTR(temp1_min_flag, S_IRUGO, show_temp_min_flag, NULL);
+
+
+static struct attribute *ad7414_attributes[] = {
+	&dev_attr_temp1_input.attr,
+	&dev_attr_temp1_max.attr,
+	&dev_attr_temp1_min.attr,
+	&dev_attr_temp1_alert.attr,
+	&dev_attr_temp1_max_flag.attr,
+	&dev_attr_temp1_min_flag.attr,
+	NULL
+};
+
+static const struct attribute_group ad7414_group = {
+	.attrs = ad7414_attributes,
+};
+
+static int ad7414_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct ad7414_data *data;
+	int err = 0;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA |
+					I2C_FUNC_SMBUS_WORD_DATA))
+		goto exit;
+
+	data = kzalloc(sizeof(struct ad7414_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->lock);
+
+	dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
+
+	/* Register sysfs hooks */
+	err = sysfs_create_group(&client->dev.kobj, &ad7414_group);
+	if (err)
+		goto exit_free;
+
+	data->dev = hwmon_device_register(&client->dev);
+	if (IS_ERR(data->dev)) {
+		err = PTR_ERR(data->dev);
+		goto exit_remove;
+	}
+
+	return 0;
+
+exit_remove:
+	sysfs_remove_group(&client->dev.kobj, &ad7414_group);
+exit_free:
+	kfree(data);
+exit:
+	return err;
+}
+
+static int __devexit ad7414_remove(struct i2c_client *client)
+{
+	struct ad7414_data *data = i2c_get_clientdata(client);
+
+	hwmon_device_unregister(data->dev);
+	sysfs_remove_group(&client->dev.kobj, &ad7414_group);
+	kfree(data);
+	return 0;
+}
+
+static const struct i2c_device_id ad7414_id[] = {
+	{ "ad7414", 0 },
+	{}
+};
+
+static struct i2c_driver ad7414_driver = {
+	.driver = {
+		.name	= "ad7414",
+	},
+	.probe	= ad7414_probe,
+	.remove	= __devexit_p(ad7414_remove),
+	.id_table = ad7414_id,
+};
+
+static int __init ad7414_init(void)
+{
+	return i2c_add_driver(&ad7414_driver);
+}
+module_init(ad7414_init);
+
+static void __exit ad7414_exit(void)
+{
+	i2c_del_driver(&ad7414_driver);
+}
+module_exit(ad7414_exit);
+
+MODULE_AUTHOR("Stefan Roese <sr at denx.de>, "
+	      "Frank Edelhaeuser <frank.edelhaeuser at spansion.com>");
+
+MODULE_DESCRIPTION("AD7414 driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);

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