summaryrefslogtreecommitdiff
path: root/drivers/hwmon/lm77.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/hwmon/lm77.c')
-rw-r--r--drivers/hwmon/lm77.c172
1 files changed, 96 insertions, 76 deletions
diff --git a/drivers/hwmon/lm77.c b/drivers/hwmon/lm77.c
index 8dfc6782d596..0fca8613e7d8 100644
--- a/drivers/hwmon/lm77.c
+++ b/drivers/hwmon/lm77.c
@@ -1,29 +1,29 @@
/*
- lm77.c - Part of lm_sensors, Linux kernel modules for hardware
- monitoring
-
- Copyright (c) 2004 Andras BALI <drewie@freemail.hu>
-
- Heavily based on lm75.c by Frodo Looijaard <frodol@dds.nl>. The LM77
- is a temperature sensor and thermal window comparator with 0.5 deg
- resolution made by National Semiconductor. Complete datasheet can be
- obtained at their site:
- http://www.national.com/pf/LM/LM77.html
-
- 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.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
+ * lm77.c - Part of lm_sensors, Linux kernel modules for hardware
+ * monitoring
+ *
+ * Copyright (c) 2004 Andras BALI <drewie@freemail.hu>
+ *
+ * Heavily based on lm75.c by Frodo Looijaard <frodol@dds.nl>. The LM77
+ * is a temperature sensor and thermal window comparator with 0.5 deg
+ * resolution made by National Semiconductor. Complete datasheet can be
+ * obtained at their site:
+ * http://www.national.com/pf/LM/LM77.html
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
#include <linux/module.h>
#include <linux/init.h>
@@ -49,7 +49,7 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b,
/* Each client has this additional data */
struct lm77_data {
- struct device *hwmon_dev;
+ struct device *hwmon_dev;
struct mutex update_lock;
char valid;
unsigned long last_updated; /* In jiffies */
@@ -95,8 +95,10 @@ static struct i2c_driver lm77_driver = {
#define LM77_TEMP_MIN (-55000)
#define LM77_TEMP_MAX 125000
-/* In the temperature registers, the low 3 bits are not part of the
- temperature values; they are the status bits. */
+/*
+ * In the temperature registers, the low 3 bits are not part of the
+ * temperature values; they are the status bits.
+ */
static inline s16 LM77_TEMP_TO_REG(int temp)
{
int ntemp = SENSORS_LIMIT(temp, LM77_TEMP_MIN, LM77_TEMP_MAX);
@@ -112,7 +114,9 @@ static inline int LM77_TEMP_FROM_REG(s16 reg)
/* read routines for temperature limits */
#define show(value) \
-static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \
+static ssize_t show_##value(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
{ \
struct lm77_data *data = lm77_update_device(dev); \
return sprintf(buf, "%d\n", data->value); \
@@ -124,17 +128,20 @@ show(temp_min);
show(temp_max);
/* read routines for hysteresis values */
-static ssize_t show_temp_crit_hyst(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_temp_crit_hyst(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct lm77_data *data = lm77_update_device(dev);
return sprintf(buf, "%d\n", data->temp_crit - data->temp_hyst);
}
-static ssize_t show_temp_min_hyst(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_temp_min_hyst(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct lm77_data *data = lm77_update_device(dev);
return sprintf(buf, "%d\n", data->temp_min + data->temp_hyst);
}
-static ssize_t show_temp_max_hyst(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t show_temp_max_hyst(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct lm77_data *data = lm77_update_device(dev);
return sprintf(buf, "%d\n", data->temp_max - data->temp_hyst);
@@ -142,29 +149,42 @@ static ssize_t show_temp_max_hyst(struct device *dev, struct device_attribute *a
/* write routines */
#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 lm77_data *data = i2c_get_clientdata(client); \
- long val = simple_strtol(buf, NULL, 10); \
- \
- mutex_lock(&data->update_lock); \
- data->value = val; \
- lm77_write_value(client, reg, LM77_TEMP_TO_REG(data->value)); \
- mutex_unlock(&data->update_lock); \
- return count; \
+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 lm77_data *data = i2c_get_clientdata(client); \
+ long val; \
+ int err = kstrtol(buf, 10, &val); \
+ if (err) \
+ return err; \
+ \
+ mutex_lock(&data->update_lock); \
+ data->value = val; \
+ lm77_write_value(client, reg, LM77_TEMP_TO_REG(data->value)); \
+ mutex_unlock(&data->update_lock); \
+ return count; \
}
set(temp_min, LM77_REG_TEMP_MIN);
set(temp_max, LM77_REG_TEMP_MAX);
-/* hysteresis is stored as a relative value on the chip, so it has to be
- converted first */
-static ssize_t set_temp_crit_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+/*
+ * hysteresis is stored as a relative value on the chip, so it has to be
+ * converted first
+ */
+static ssize_t set_temp_crit_hyst(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm77_data *data = i2c_get_clientdata(client);
- unsigned long val = simple_strtoul(buf, NULL, 10);
+ unsigned long val;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
mutex_lock(&data->update_lock);
data->temp_hyst = data->temp_crit - val;
@@ -175,13 +195,19 @@ static ssize_t set_temp_crit_hyst(struct device *dev, struct device_attribute *a
}
/* preserve hysteresis when setting T_crit */
-static ssize_t set_temp_crit(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+static ssize_t set_temp_crit(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm77_data *data = i2c_get_clientdata(client);
- long val = simple_strtoul(buf, NULL, 10);
int oldcrithyst;
-
+ unsigned long val;
+ int err;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+
mutex_lock(&data->update_lock);
oldcrithyst = data->temp_crit - data->temp_hyst;
data->temp_crit = val;
@@ -251,17 +277,19 @@ static int lm77_detect(struct i2c_client *new_client,
I2C_FUNC_SMBUS_WORD_DATA))
return -ENODEV;
- /* Here comes the remaining detection. Since the LM77 has no
- register dedicated to identification, we have to rely on the
- following tricks:
-
- 1. the high 4 bits represent the sign and thus they should
- always be the same
- 2. the high 3 bits are unused in the configuration register
- 3. addresses 0x06 and 0x07 return the last read value
- 4. registers cycling over 8-address boundaries
-
- Word-sized registers are high-byte first. */
+ /*
+ * Here comes the remaining detection. Since the LM77 has no
+ * register dedicated to identification, we have to rely on the
+ * following tricks:
+ *
+ * 1. the high 4 bits represent the sign and thus they should
+ * always be the same
+ * 2. the high 3 bits are unused in the configuration register
+ * 3. addresses 0x06 and 0x07 return the last read value
+ * 4. registers cycling over 8-address boundaries
+ *
+ * Word-sized registers are high-byte first.
+ */
/* addresses cycling */
cur = i2c_smbus_read_word_data(new_client, 0);
@@ -330,7 +358,8 @@ static int lm77_probe(struct i2c_client *new_client,
lm77_init_client(new_client);
/* Register sysfs hooks */
- if ((err = sysfs_create_group(&new_client->dev.kobj, &lm77_group)))
+ err = sysfs_create_group(&new_client->dev.kobj, &lm77_group);
+ if (err)
goto exit_free;
data->hwmon_dev = hwmon_device_register(&new_client->dev);
@@ -358,8 +387,10 @@ static int lm77_remove(struct i2c_client *client)
return 0;
}
-/* All registers are word-sized, except for the configuration register.
- The LM77 uses the high-byte first convention. */
+/*
+ * All registers are word-sized, except for the configuration register.
+ * The LM77 uses the high-byte first convention.
+ */
static u16 lm77_read_value(struct i2c_client *client, u8 reg)
{
if (reg == LM77_REG_CONF)
@@ -420,19 +451,8 @@ static struct lm77_data *lm77_update_device(struct device *dev)
return data;
}
-static int __init sensors_lm77_init(void)
-{
- return i2c_add_driver(&lm77_driver);
-}
-
-static void __exit sensors_lm77_exit(void)
-{
- i2c_del_driver(&lm77_driver);
-}
+module_i2c_driver(lm77_driver);
MODULE_AUTHOR("Andras BALI <drewie@freemail.hu>");
MODULE_DESCRIPTION("LM77 driver");
MODULE_LICENSE("GPL");
-
-module_init(sensors_lm77_init);
-module_exit(sensors_lm77_exit);