#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
-#include <linux/i2c-sensor.h>
#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
+#include <linux/mutex.h>
/* Addresses to scan */
-static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, I2C_CLIENT_END };
-
-/* Insmod parameters */
-SENSORS_INSMOD_1(lm77);
+static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
+ I2C_CLIENT_END };
/* The LM77 registers */
#define LM77_REG_TEMP 0x00
/* Each client has this additional data */
struct lm77_data {
- struct i2c_client client;
- struct class_device *class_dev;
- struct semaphore update_lock;
+ struct device *hwmon_dev;
+ struct mutex update_lock;
char valid;
unsigned long last_updated; /* In jiffies */
int temp_input; /* Temperatures */
u8 alarms;
};
-static int lm77_attach_adapter(struct i2c_adapter *adapter);
-static int lm77_detect(struct i2c_adapter *adapter, int address, int kind);
+static int lm77_probe(struct i2c_client *client,
+ const struct i2c_device_id *id);
+static int lm77_detect(struct i2c_client *client, struct i2c_board_info *info);
static void lm77_init_client(struct i2c_client *client);
-static int lm77_detach_client(struct i2c_client *client);
+static int lm77_remove(struct i2c_client *client);
static u16 lm77_read_value(struct i2c_client *client, u8 reg);
static int lm77_write_value(struct i2c_client *client, u8 reg, u16 value);
static struct lm77_data *lm77_update_device(struct device *dev);
+static const struct i2c_device_id lm77_id[] = {
+ { "lm77", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lm77_id);
+
/* This is the driver that will be inserted */
static struct i2c_driver lm77_driver = {
- .owner = THIS_MODULE,
- .name = "lm77",
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = lm77_attach_adapter,
- .detach_client = lm77_detach_client,
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "lm77",
+ },
+ .probe = lm77_probe,
+ .remove = lm77_remove,
+ .id_table = lm77_id,
+ .detect = lm77_detect,
+ .address_list = normal_i2c,
};
/* straight from the datasheet */
/* In the temperature registers, the low 3 bits are not part of the
temperature values; they are the status bits. */
-static inline u16 LM77_TEMP_TO_REG(int temp)
+static inline s16 LM77_TEMP_TO_REG(int temp)
{
int ntemp = SENSORS_LIMIT(temp, LM77_TEMP_MIN, LM77_TEMP_MAX);
- return (u16)((ntemp / 500) * 8);
+ return (ntemp / 500) * 8;
}
-static inline int LM77_TEMP_FROM_REG(u16 reg)
+static inline int LM77_TEMP_FROM_REG(s16 reg)
{
- return ((int)reg / 8) * 500;
+ return (reg / 8) * 500;
}
/* sysfs stuff */
show(temp_crit);
show(temp_min);
show(temp_max);
-show(alarms);
/* read routines for hysteresis values */
static ssize_t show_temp_crit_hyst(struct device *dev, struct device_attribute *attr, char *buf)
{ \
struct i2c_client *client = to_i2c_client(dev); \
struct lm77_data *data = i2c_get_clientdata(client); \
- long val = simple_strtoul(buf, NULL, 10); \
+ long val = simple_strtol(buf, NULL, 10); \
\
- down(&data->update_lock); \
+ mutex_lock(&data->update_lock); \
data->value = val; \
lm77_write_value(client, reg, LM77_TEMP_TO_REG(data->value)); \
- up(&data->update_lock); \
+ mutex_unlock(&data->update_lock); \
return count; \
}
struct lm77_data *data = i2c_get_clientdata(client);
unsigned long val = simple_strtoul(buf, NULL, 10);
- down(&data->update_lock);
+ mutex_lock(&data->update_lock);
data->temp_hyst = data->temp_crit - val;
lm77_write_value(client, LM77_REG_TEMP_HYST,
LM77_TEMP_TO_REG(data->temp_hyst));
- up(&data->update_lock);
+ mutex_unlock(&data->update_lock);
return count;
}
long val = simple_strtoul(buf, NULL, 10);
int oldcrithyst;
- down(&data->update_lock);
+ mutex_lock(&data->update_lock);
oldcrithyst = data->temp_crit - data->temp_hyst;
data->temp_crit = val;
data->temp_hyst = data->temp_crit - oldcrithyst;
LM77_TEMP_TO_REG(data->temp_crit));
lm77_write_value(client, LM77_REG_TEMP_HYST,
LM77_TEMP_TO_REG(data->temp_hyst));
- up(&data->update_lock);
+ mutex_unlock(&data->update_lock);
return count;
}
+static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int bitnr = to_sensor_dev_attr(attr)->index;
+ struct lm77_data *data = lm77_update_device(dev);
+ return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
+}
+
static DEVICE_ATTR(temp1_input, S_IRUGO,
show_temp_input, NULL);
static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
show_temp_max_hyst, NULL);
-static DEVICE_ATTR(alarms, S_IRUGO,
- show_alarms, NULL);
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 1);
+
+static struct attribute *lm77_attributes[] = {
+ &dev_attr_temp1_input.attr,
+ &dev_attr_temp1_crit.attr,
+ &dev_attr_temp1_min.attr,
+ &dev_attr_temp1_max.attr,
+ &dev_attr_temp1_crit_hyst.attr,
+ &dev_attr_temp1_min_hyst.attr,
+ &dev_attr_temp1_max_hyst.attr,
+ &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+ NULL
+};
-static int lm77_attach_adapter(struct i2c_adapter *adapter)
-{
- if (!(adapter->class & I2C_CLASS_HWMON))
- return 0;
- return i2c_detect(adapter, &addr_data, lm77_detect);
-}
+static const struct attribute_group lm77_group = {
+ .attrs = lm77_attributes,
+};
-/* This function is called by i2c_detect */
-static int lm77_detect(struct i2c_adapter *adapter, int address, int kind)
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int lm77_detect(struct i2c_client *new_client,
+ struct i2c_board_info *info)
{
- struct i2c_client *new_client;
- struct lm77_data *data;
- int err = 0;
- const char *name = "";
+ struct i2c_adapter *adapter = new_client->adapter;
+ int i, cur, conf, hyst, crit, min, max;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_WORD_DATA))
- goto exit;
-
- /* 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 lm77_{read,write}_value. */
- if (!(data = kmalloc(sizeof(struct lm77_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
- memset(data, 0, sizeof(struct lm77_data));
-
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &lm77_driver;
- new_client->flags = 0;
+ return -ENODEV;
/* Here comes the remaining detection. Since the LM77 has no
register dedicated to identification, we have to rely on the
4. registers cycling over 8-address boundaries
Word-sized registers are high-byte first. */
- if (kind < 0) {
- int i, cur, conf, hyst, crit, min, max;
-
- /* addresses cycling */
- cur = i2c_smbus_read_word_data(new_client, 0);
- conf = i2c_smbus_read_byte_data(new_client, 1);
- hyst = i2c_smbus_read_word_data(new_client, 2);
- crit = i2c_smbus_read_word_data(new_client, 3);
- min = i2c_smbus_read_word_data(new_client, 4);
- max = i2c_smbus_read_word_data(new_client, 5);
- for (i = 8; i <= 0xff; i += 8)
- if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
- || i2c_smbus_read_word_data(new_client, i + 2) != hyst
- || i2c_smbus_read_word_data(new_client, i + 3) != crit
- || i2c_smbus_read_word_data(new_client, i + 4) != min
- || i2c_smbus_read_word_data(new_client, i + 5) != max)
- goto exit_free;
-
- /* sign bits */
- if (((cur & 0x00f0) != 0xf0 && (cur & 0x00f0) != 0x0)
- || ((hyst & 0x00f0) != 0xf0 && (hyst & 0x00f0) != 0x0)
- || ((crit & 0x00f0) != 0xf0 && (crit & 0x00f0) != 0x0)
- || ((min & 0x00f0) != 0xf0 && (min & 0x00f0) != 0x0)
- || ((max & 0x00f0) != 0xf0 && (max & 0x00f0) != 0x0))
- goto exit_free;
-
- /* unused bits */
- if (conf & 0xe0)
- goto exit_free;
-
- /* 0x06 and 0x07 return the last read value */
- cur = i2c_smbus_read_word_data(new_client, 0);
- if (i2c_smbus_read_word_data(new_client, 6) != cur
- || i2c_smbus_read_word_data(new_client, 7) != cur)
- goto exit_free;
- hyst = i2c_smbus_read_word_data(new_client, 2);
- if (i2c_smbus_read_word_data(new_client, 6) != hyst
- || i2c_smbus_read_word_data(new_client, 7) != hyst)
- goto exit_free;
- min = i2c_smbus_read_word_data(new_client, 4);
- if (i2c_smbus_read_word_data(new_client, 6) != min
- || i2c_smbus_read_word_data(new_client, 7) != min)
- goto exit_free;
+ /* addresses cycling */
+ cur = i2c_smbus_read_word_data(new_client, 0);
+ conf = i2c_smbus_read_byte_data(new_client, 1);
+ hyst = i2c_smbus_read_word_data(new_client, 2);
+ crit = i2c_smbus_read_word_data(new_client, 3);
+ min = i2c_smbus_read_word_data(new_client, 4);
+ max = i2c_smbus_read_word_data(new_client, 5);
+ for (i = 8; i <= 0xff; i += 8) {
+ if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
+ || i2c_smbus_read_word_data(new_client, i + 2) != hyst
+ || i2c_smbus_read_word_data(new_client, i + 3) != crit
+ || i2c_smbus_read_word_data(new_client, i + 4) != min
+ || i2c_smbus_read_word_data(new_client, i + 5) != max)
+ return -ENODEV;
}
- /* Determine the chip type - only one kind supported! */
- if (kind <= 0)
- kind = lm77;
+ /* sign bits */
+ if (((cur & 0x00f0) != 0xf0 && (cur & 0x00f0) != 0x0)
+ || ((hyst & 0x00f0) != 0xf0 && (hyst & 0x00f0) != 0x0)
+ || ((crit & 0x00f0) != 0xf0 && (crit & 0x00f0) != 0x0)
+ || ((min & 0x00f0) != 0xf0 && (min & 0x00f0) != 0x0)
+ || ((max & 0x00f0) != 0xf0 && (max & 0x00f0) != 0x0))
+ return -ENODEV;
+
+ /* unused bits */
+ if (conf & 0xe0)
+ return -ENODEV;
+
+ /* 0x06 and 0x07 return the last read value */
+ cur = i2c_smbus_read_word_data(new_client, 0);
+ if (i2c_smbus_read_word_data(new_client, 6) != cur
+ || i2c_smbus_read_word_data(new_client, 7) != cur)
+ return -ENODEV;
+ hyst = i2c_smbus_read_word_data(new_client, 2);
+ if (i2c_smbus_read_word_data(new_client, 6) != hyst
+ || i2c_smbus_read_word_data(new_client, 7) != hyst)
+ return -ENODEV;
+ min = i2c_smbus_read_word_data(new_client, 4);
+ if (i2c_smbus_read_word_data(new_client, 6) != min
+ || i2c_smbus_read_word_data(new_client, 7) != min)
+ return -ENODEV;
+
+ strlcpy(info->type, "lm77", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static int lm77_probe(struct i2c_client *new_client,
+ const struct i2c_device_id *id)
+{
+ struct lm77_data *data;
+ int err;
- if (kind == lm77) {
- name = "lm77";
+ data = kzalloc(sizeof(struct lm77_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit;
}
- /* Fill in the remaining client fields and put it into the global list */
- strlcpy(new_client->name, name, I2C_NAME_SIZE);
+ i2c_set_clientdata(new_client, data);
data->valid = 0;
- init_MUTEX(&data->update_lock);
-
- /* Tell the I2C layer a new client has arrived */
- if ((err = i2c_attach_client(new_client)))
- goto exit_free;
+ mutex_init(&data->update_lock);
/* Initialize the LM77 chip */
lm77_init_client(new_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(&new_client->dev.kobj, &lm77_group)))
+ goto exit_free;
+
+ data->hwmon_dev = hwmon_device_register(&new_client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ goto exit_remove;
}
- device_create_file(&new_client->dev, &dev_attr_temp1_input);
- device_create_file(&new_client->dev, &dev_attr_temp1_crit);
- device_create_file(&new_client->dev, &dev_attr_temp1_min);
- device_create_file(&new_client->dev, &dev_attr_temp1_max);
- device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst);
- device_create_file(&new_client->dev, &dev_attr_temp1_min_hyst);
- device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
- device_create_file(&new_client->dev, &dev_attr_alarms);
return 0;
-exit_detach:
- i2c_detach_client(new_client);
+exit_remove:
+ sysfs_remove_group(&new_client->dev.kobj, &lm77_group);
exit_free:
kfree(data);
exit:
return err;
}
-static int lm77_detach_client(struct i2c_client *client)
+static int lm77_remove(struct i2c_client *client)
{
struct lm77_data *data = i2c_get_clientdata(client);
- hwmon_device_unregister(data->class_dev);
- i2c_detach_client(client);
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &lm77_group);
kfree(data);
return 0;
}
struct i2c_client *client = to_i2c_client(dev);
struct lm77_data *data = i2c_get_clientdata(client);
- down(&data->update_lock);
+ mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
data->valid = 1;
}
- up(&data->update_lock);
+ mutex_unlock(&data->update_lock);
return data;
}
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