#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/sysfs.h>
#include "lm75.h"
/* Addresses to scan */
-static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
+static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
/* Insmod parameters */
-I2C_CLIENT_INSMOD_1(ds1621);
static int polarity = -1;
module_param(polarity, int, 0);
MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
#define DS1621_REG_CONFIG_DONE 0x80
/* The DS1621 registers */
-#define DS1621_REG_TEMP 0xAA /* word, RO */
-#define DS1621_REG_TEMP_MIN 0xA1 /* word, RW */
-#define DS1621_REG_TEMP_MAX 0xA2 /* word, RW */
+static const u8 DS1621_REG_TEMP[3] = {
+ 0xAA, /* input, word, RO */
+ 0xA2, /* min, word, RW */
+ 0xA1, /* max, word, RW */
+};
#define DS1621_REG_CONF 0xAC /* byte, RW */
#define DS1621_COM_START 0xEE /* no data */
#define DS1621_COM_STOP 0x22 /* no data */
#define DS1621_ALARM_TEMP_HIGH 0x40
#define DS1621_ALARM_TEMP_LOW 0x20
-/* Conversions. Rounding and limit checking is only done on the TO_REG
- variants. Note that you should be a bit careful with which arguments
- these macros are called: arguments may be evaluated more than once.
- Fixing this is just not worth it. */
+/* Conversions */
#define ALARMS_FROM_REG(val) ((val) & \
(DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))
/* Each client has this additional data */
struct ds1621_data {
- struct i2c_client client;
- struct class_device *class_dev;
- struct semaphore update_lock;
+ struct device *hwmon_dev;
+ struct mutex update_lock;
char valid; /* !=0 if following fields are valid */
unsigned long last_updated; /* In jiffies */
- u16 temp, temp_min, temp_max; /* Register values, word */
+ u16 temp[3]; /* Register values, word */
u8 conf; /* Register encoding, combined */
};
-static int ds1621_attach_adapter(struct i2c_adapter *adapter);
-static int ds1621_detect(struct i2c_adapter *adapter, int address,
- int kind);
-static void ds1621_init_client(struct i2c_client *client);
-static int ds1621_detach_client(struct i2c_client *client);
-static struct ds1621_data *ds1621_update_client(struct device *dev);
-
-/* This is the driver that will be inserted */
-static struct i2c_driver ds1621_driver = {
- .owner = THIS_MODULE,
- .name = "ds1621",
- .id = I2C_DRIVERID_DS1621,
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = ds1621_attach_adapter,
- .detach_client = ds1621_detach_client,
-};
-
-/* All registers are word-sized, except for the configuration register.
+/* Temperature registers are word-sized.
DS1621 uses a high-byte first convention, which is exactly opposite to
- the usual practice. */
-static int ds1621_read_value(struct i2c_client *client, u8 reg)
+ the SMBus standard. */
+static int ds1621_read_temp(struct i2c_client *client, u8 reg)
{
- if (reg == DS1621_REG_CONF)
- return i2c_smbus_read_byte_data(client, reg);
- else
- return swab16(i2c_smbus_read_word_data(client, reg));
+ int ret;
+
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0)
+ return ret;
+ return swab16(ret);
}
-/* All registers are word-sized, except for the configuration register.
- DS1621 uses a high-byte first convention, which is exactly opposite to
- the usual practice. */
-static int ds1621_write_value(struct i2c_client *client, u8 reg, u16 value)
+static int ds1621_write_temp(struct i2c_client *client, u8 reg, u16 value)
{
- if (reg == DS1621_REG_CONF)
- return i2c_smbus_write_byte_data(client, reg, value);
- else
- return i2c_smbus_write_word_data(client, reg, swab16(value));
+ return i2c_smbus_write_word_data(client, reg, swab16(value));
}
static void ds1621_init_client(struct i2c_client *client)
{
- int reg = ds1621_read_value(client, DS1621_REG_CONF);
+ u8 conf, new_conf;
+
+ new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
/* switch to continuous conversion mode */
- reg &= ~ DS1621_REG_CONFIG_1SHOT;
+ new_conf &= ~DS1621_REG_CONFIG_1SHOT;
/* setup output polarity */
if (polarity == 0)
- reg &= ~DS1621_REG_CONFIG_POLARITY;
+ new_conf &= ~DS1621_REG_CONFIG_POLARITY;
else if (polarity == 1)
- reg |= DS1621_REG_CONFIG_POLARITY;
+ new_conf |= DS1621_REG_CONFIG_POLARITY;
- ds1621_write_value(client, DS1621_REG_CONF, reg);
+ if (conf != new_conf)
+ i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);
/* start conversion */
i2c_smbus_write_byte(client, DS1621_COM_START);
}
-#define show(value) \
-static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
-{ \
- struct ds1621_data *data = ds1621_update_client(dev); \
- return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->value)); \
+static struct ds1621_data *ds1621_update_client(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct ds1621_data *data = i2c_get_clientdata(client);
+ u8 new_conf;
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+ || !data->valid) {
+ int i;
+
+ dev_dbg(&client->dev, "Starting ds1621 update\n");
+
+ data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
+
+ for (i = 0; i < ARRAY_SIZE(data->temp); i++)
+ data->temp[i] = ds1621_read_temp(client,
+ DS1621_REG_TEMP[i]);
+
+ /* reset alarms if necessary */
+ new_conf = data->conf;
+ if (data->temp[0] > data->temp[1]) /* input > min */
+ new_conf &= ~DS1621_ALARM_TEMP_LOW;
+ if (data->temp[0] < data->temp[2]) /* input < max */
+ new_conf &= ~DS1621_ALARM_TEMP_HIGH;
+ if (data->conf != new_conf)
+ i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
+ new_conf);
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
}
-show(temp);
-show(temp_min);
-show(temp_max);
-
-#define set_temp(suffix, value, reg) \
-static ssize_t set_temp_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
- size_t count) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct ds1621_data *data = ds1621_update_client(dev); \
- u16 val = LM75_TEMP_TO_REG(simple_strtoul(buf, NULL, 10)); \
- \
- down(&data->update_lock); \
- data->value = val; \
- ds1621_write_value(client, reg, data->value); \
- up(&data->update_lock); \
- 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 ds1621_data *data = ds1621_update_client(dev);
+ return sprintf(buf, "%d\n",
+ LM75_TEMP_FROM_REG(data->temp[attr->index]));
}
-set_temp(min, temp_min, DS1621_REG_TEMP_MIN);
-set_temp(max, temp_max, DS1621_REG_TEMP_MAX);
+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);
+ struct ds1621_data *data = i2c_get_clientdata(client);
+ u16 val = LM75_TEMP_TO_REG(simple_strtol(buf, NULL, 10));
+
+ mutex_lock(&data->update_lock);
+ data->temp[attr->index] = val;
+ ds1621_write_temp(client, DS1621_REG_TEMP[attr->index],
+ data->temp[attr->index]);
+ mutex_unlock(&data->update_lock);
+ return count;
+}
-static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
+ char *buf)
{
struct ds1621_data *data = ds1621_update_client(dev);
return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
}
+static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
+ struct ds1621_data *data = ds1621_update_client(dev);
+ return sprintf(buf, "%d\n", !!(data->conf & attr->index));
+}
+
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
-static DEVICE_ATTR(temp1_input, S_IRUGO , show_temp, NULL);
-static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO , show_temp_min, set_temp_min);
-static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max);
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_min, 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 SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
+ DS1621_ALARM_TEMP_LOW);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
+ DS1621_ALARM_TEMP_HIGH);
+
+static struct attribute *ds1621_attributes[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+ &dev_attr_alarms.attr,
+ NULL
+};
+static const struct attribute_group ds1621_group = {
+ .attrs = ds1621_attributes,
+};
-static int ds1621_attach_adapter(struct i2c_adapter *adapter)
-{
- return i2c_probe(adapter, &addr_data, ds1621_detect);
-}
-/* This function is called by i2c_probe */
-int ds1621_detect(struct i2c_adapter *adapter, int address,
- int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int ds1621_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
{
+ struct i2c_adapter *adapter = client->adapter;
int conf, temp;
- struct i2c_client *new_client;
- struct ds1621_data *data;
- int err = 0;
+ int i;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_WORD_DATA
| I2C_FUNC_SMBUS_WRITE_BYTE))
- goto exit;
+ return -ENODEV;
- /* OK. For now, we presume we have a valid client. We now create the
- client structure, even though we cannot fill it completely yet.
- But it allows us to access ds1621_{read,write}_value. */
- if (!(data = kmalloc(sizeof(struct ds1621_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
+ /* Now, we do the remaining detection. It is lousy. */
+ /* The NVB bit should be low if no EEPROM write has been requested
+ during the latest 10ms, which is highly improbable in our case. */
+ conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
+ if (conf < 0 || conf & DS1621_REG_CONFIG_NVB)
+ return -ENODEV;
+ /* The 7 lowest bits of a temperature should always be 0. */
+ for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
+ temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]);
+ if (temp < 0 || (temp & 0x7f00))
+ return -ENODEV;
}
- memset(data, 0, sizeof(struct ds1621_data));
-
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &ds1621_driver;
- new_client->flags = 0;
+ strlcpy(info->type, "ds1621", I2C_NAME_SIZE);
- /* Now, we do the remaining detection. It is lousy. */
- if (kind < 0) {
- /* The NVB bit should be low if no EEPROM write has been
- requested during the latest 10ms, which is highly
- improbable in our case. */
- conf = ds1621_read_value(new_client, DS1621_REG_CONF);
- if (conf & DS1621_REG_CONFIG_NVB)
- goto exit_free;
- /* The 7 lowest bits of a temperature should always be 0. */
- temp = ds1621_read_value(new_client, DS1621_REG_TEMP);
- if (temp & 0x007f)
- goto exit_free;
- temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MIN);
- if (temp & 0x007f)
- goto exit_free;
- temp = ds1621_read_value(new_client, DS1621_REG_TEMP_MAX);
- if (temp & 0x007f)
- goto exit_free;
- }
+ return 0;
+}
- /* Determine the chip type - only one kind supported! */
- if (kind <= 0)
- kind = ds1621;
+static int ds1621_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ds1621_data *data;
+ int err;
- /* Fill in remaining client fields and put it into the global list */
- strlcpy(new_client->name, "ds1621", I2C_NAME_SIZE);
- data->valid = 0;
- init_MUTEX(&data->update_lock);
+ data = kzalloc(sizeof(struct ds1621_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
+ }
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto exit_free;
+ i2c_set_clientdata(client, data);
+ mutex_init(&data->update_lock);
/* Initialize the DS1621 chip */
- ds1621_init_client(new_client);
+ ds1621_init_client(client);
/* Register sysfs hooks */
- data->class_dev = hwmon_device_register(&new_client->dev);
- if (IS_ERR(data->class_dev)) {
- err = PTR_ERR(data->class_dev);
- goto exit_detach;
+ if ((err = sysfs_create_group(&client->dev.kobj, &ds1621_group)))
+ 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_files;
}
- device_create_file(&new_client->dev, &dev_attr_alarms);
- device_create_file(&new_client->dev, &dev_attr_temp1_input);
- device_create_file(&new_client->dev, &dev_attr_temp1_min);
- device_create_file(&new_client->dev, &dev_attr_temp1_max);
-
return 0;
-/* OK, this is not exactly good programming practice, usually. But it is
- very code-efficient in this case. */
- exit_detach:
- i2c_detach_client(new_client);
+ exit_remove_files:
+ sysfs_remove_group(&client->dev.kobj, &ds1621_group);
exit_free:
kfree(data);
exit:
return err;
}
-static int ds1621_detach_client(struct i2c_client *client)
+static int ds1621_remove(struct i2c_client *client)
{
struct ds1621_data *data = i2c_get_clientdata(client);
- int err;
-
- hwmon_device_unregister(data->class_dev);
- if ((err = i2c_detach_client(client)))
- return err;
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &ds1621_group);
kfree(data);
return 0;
}
+static const struct i2c_device_id ds1621_id[] = {
+ { "ds1621", 0 },
+ { "ds1625", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds1621_id);
-static struct ds1621_data *ds1621_update_client(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct ds1621_data *data = i2c_get_clientdata(client);
- u8 new_conf;
-
- down(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
- || !data->valid) {
-
- dev_dbg(&client->dev, "Starting ds1621 update\n");
-
- data->conf = ds1621_read_value(client, DS1621_REG_CONF);
-
- data->temp = ds1621_read_value(client, DS1621_REG_TEMP);
-
- data->temp_min = ds1621_read_value(client,
- DS1621_REG_TEMP_MIN);
- data->temp_max = ds1621_read_value(client,
- DS1621_REG_TEMP_MAX);
-
- /* reset alarms if necessary */
- new_conf = data->conf;
- if (data->temp < data->temp_min)
- new_conf &= ~DS1621_ALARM_TEMP_LOW;
- if (data->temp > data->temp_max)
- new_conf &= ~DS1621_ALARM_TEMP_HIGH;
- if (data->conf != new_conf)
- ds1621_write_value(client, DS1621_REG_CONF,
- new_conf);
-
- data->last_updated = jiffies;
- data->valid = 1;
- }
-
- up(&data->update_lock);
-
- return data;
-}
+/* This is the driver that will be inserted */
+static struct i2c_driver ds1621_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "ds1621",
+ },
+ .probe = ds1621_probe,
+ .remove = ds1621_remove,
+ .id_table = ds1621_id,
+ .detect = ds1621_detect,
+ .address_list = normal_i2c,
+};
static int __init ds1621_init(void)
{
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