[linux-yocto] [PATCH 02/87] drivers/hwmon: add support for Analog Devices ADT75
Paul Butler
butler.paul at gmail.com
Mon May 27 09:55:33 PDT 2013
Signed-off-by: Paul Butler <paul.butler at windriver.com>
---
drivers/hwmon/Kconfig | 10 +++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/adt75.c | 211 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 222 insertions(+)
create mode 100644 drivers/hwmon/adt75.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 8deedc1..23d4d4c 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -221,6 +221,16 @@ config SENSORS_ADT7475
This driver can also be build as a module. If so, the module
will be called adt7475.
+config SENSORS_ADT75
+ tristate "Analog Devices ADT75"
+ depends on I2C
+ help
+ If you say yes here you get support for the Analog Devices
+ ADT75 temperature monitoring chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called adt75.
+
config SENSORS_ASC7621
tristate "Andigilog aSC7621"
depends on I2C
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 6d3f11f..63b6b8a 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_SENSORS_ADT7411) += adt7411.o
obj-$(CONFIG_SENSORS_ADT7462) += adt7462.o
obj-$(CONFIG_SENSORS_ADT7470) += adt7470.o
obj-$(CONFIG_SENSORS_ADT7475) += adt7475.o
+obj-$(CONFIG_SENSORS_ADT75) += adt75.o
obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o
obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o
obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
diff --git a/drivers/hwmon/adt75.c b/drivers/hwmon/adt75.c
new file mode 100644
index 0000000..90d406c
--- /dev/null
+++ b/drivers/hwmon/adt75.c
@@ -0,0 +1,211 @@
+/*
+ * An hwmon driver for the Analog Devices ADT75
+ *
+ * Based on ad7418.c
+ * Copyright (C) 2006-07 Tower Technologies
+ *
+ * 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 - version 2.
+ */
+
+#include <linux/module.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/delay.h>
+#include <linux/slab.h>
+
+#include "lm75.h"
+
+#define DRV_VERSION "0.1"
+
+/* ADT75 registers */
+#define ADT75_REG_TEMP_IN 0x00
+#define ADT75_REG_CONF 0x01
+#define ADT75_REG_TEMP_HYST 0x02
+#define ADT75_REG_TEMP_OS 0x03
+
+static const u8 ADT75_REG_TEMP[] = { ADT75_REG_TEMP_IN,
+ ADT75_REG_TEMP_HYST,
+ ADT75_REG_TEMP_OS };
+
+struct adt75_data {
+ struct device *hwmon_dev;
+ struct attribute_group attrs;
+ struct mutex lock;
+ char valid;
+ unsigned long last_updated; /* In jiffies */
+ s16 temp[3]; /* Register values */
+};
+
+static int adt75_probe(struct i2c_client *client,
+ const struct i2c_device_id *id);
+static int adt75_remove(struct i2c_client *client);
+
+static const struct i2c_device_id adt75_id[] = {
+ { "adt75", },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, adt75_id);
+
+static struct i2c_driver adt75_driver = {
+ .driver = {
+ .name = "adt75",
+ },
+ .probe = adt75_probe,
+ .remove = adt75_remove,
+ .id_table = adt75_id,
+};
+
+static inline int adt75_read(struct i2c_client *client, u8 reg)
+{
+ return i2c_smbus_read_word_data(client, reg);
+}
+
+static inline int adt75_write(struct i2c_client *client, u8 reg, u16 value)
+{
+ return i2c_smbus_write_word_data(client, reg, value);
+}
+
+static void adt75_init_client(struct i2c_client *client)
+{
+ int ret = adt75_write(client, ADT75_REG_CONF, 0x0000);
+ if (ret < 0)
+ dev_err(&client->dev, "cannot write configuration register\n");
+}
+
+static struct adt75_data *adt75_update_device(struct device *dev)
+{
+ int i;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct adt75_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->lock);
+
+ if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+ || !data->valid) {
+
+ for (i = 0; i < 3; i++)
+ data->temp[i] = adt75_read(client, ADT75_REG_TEMP[i]);
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->lock);
+
+ return data;
+}
+
+static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct adt75_data *data = adt75_update_device(dev);
+ return sprintf(buf, "%d\n",
+ LM75_TEMP_FROM_REG(data->temp[attr->index]));
+}
+
+static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
+ const char *buf, size_t count)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct i2c_client *client = to_i2c_client(dev);
+ struct adt75_data *data = i2c_get_clientdata(client);
+ long temp = simple_strtol(buf, NULL, 10);
+
+ mutex_lock(&data->lock);
+ data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
+ adt75_write(client,
+ ADT75_REG_TEMP[attr->index],
+ data->temp[attr->index]);
+ mutex_unlock(&data->lock);
+ return count;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
+ show_temp, set_temp, 1);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
+ show_temp, set_temp, 2);
+
+static struct attribute *adt75_attributes[] = {
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ NULL
+};
+
+static int adt75_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct adt75_data *data;
+ int err;
+
+ data = kzalloc(sizeof(struct adt75_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ i2c_set_clientdata(client, data);
+
+ mutex_init(&data->lock);
+ data->attrs.attrs = adt75_attributes;
+
+ dev_info(&client->dev, "%s chip found\n", client->name);
+
+ /* Initialize the ADT75 chip */
+ adt75_init_client(client);
+
+ /* Register sysfs hooks */
+ err = sysfs_create_group(&client->dev.kobj, &data->attrs);
+ if (err)
+ goto exit_free;
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ goto exit_remove;
+ }
+
+ return 0;
+
+exit_remove:
+ sysfs_remove_group(&client->dev.kobj, &data->attrs);
+exit_free:
+ kfree(data);
+exit:
+ return err;
+}
+
+static int adt75_remove(struct i2c_client *client)
+{
+ struct adt75_data *data = i2c_get_clientdata(client);
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &data->attrs);
+ kfree(data);
+ return 0;
+}
+
+static int __init adt75_init(void)
+{
+ return i2c_add_driver(&adt75_driver);
+}
+
+static void __exit adt75_exit(void)
+{
+ i2c_del_driver(&adt75_driver);
+}
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo at towertech.it>");
+MODULE_DESCRIPTION("ADT75 driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+
+module_init(adt75_init);
+module_exit(adt75_exit);
--
1.8.3
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