/*
- * lm95241.c - Part of lm_sensors, Linux kernel modules for hardware
- * monitoring
- * Copyright (C) 2008 Davide Rizzo <elpa-rizzo@gmail.com>
+ * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>
*
- * Based on the max1619 driver. The LM95241 is a sensor chip made by National
- * Semiconductors.
- * It reports up to three temperatures (its own plus up to
- * two external ones). Complete datasheet can be
- * obtained from National's website at:
+ * The LM95241 is a sensor chip made by National Semiconductors.
+ * It reports up to three temperatures (its own plus up to two external ones).
+ * Complete datasheet can be obtained from National's website at:
* http://www.national.com/ds.cgi/LM/LM95241.pdf
*
* This program is free software; you can redistribute it and/or modify
#include <linux/mutex.h>
#include <linux/sysfs.h>
+#define DEVNAME "lm95241"
+
static const unsigned short normal_i2c[] = {
- 0x19, 0x2a, 0x2b, I2C_CLIENT_END};
+ 0x19, 0x2a, 0x2b, I2C_CLIENT_END };
/* LM95241 registers */
#define LM95241_REG_R_MAN_ID 0xFE
#define LM95241_REG_RW_CONFIG 0x03
#define LM95241_REG_RW_REM_FILTER 0x06
#define LM95241_REG_RW_TRUTHERM 0x07
-#define LM95241_REG_W_ONE_SHOT 0x0F
+#define LM95241_REG_W_ONE_SHOT 0x0F
#define LM95241_REG_R_LOCAL_TEMPH 0x10
#define LM95241_REG_R_REMOTE1_TEMPH 0x11
#define LM95241_REG_R_REMOTE2_TEMPH 0x12
#define MANUFACTURER_ID 0x01
#define DEFAULT_REVISION 0xA4
-/* Conversions and various macros */
-#define TEMP_FROM_REG(val_h, val_l) (((val_h) & 0x80 ? (val_h) - 0x100 : \
- (val_h)) * 1000 + (val_l) * 1000 / 256)
-
-/* Functions declaration */
-static void lm95241_init_client(struct i2c_client *client);
-static struct lm95241_data *lm95241_update_device(struct device *dev);
+static const u8 lm95241_reg_address[] = {
+ LM95241_REG_R_LOCAL_TEMPH,
+ LM95241_REG_R_LOCAL_TEMPL,
+ LM95241_REG_R_REMOTE1_TEMPH,
+ LM95241_REG_R_REMOTE1_TEMPL,
+ LM95241_REG_R_REMOTE2_TEMPH,
+ LM95241_REG_R_REMOTE2_TEMPL
+};
/* Client data (each client gets its own) */
struct lm95241_data {
struct device *hwmon_dev;
struct mutex update_lock;
- unsigned long last_updated, interval; /* in jiffies */
- char valid; /* zero until following fields are valid */
+ unsigned long last_updated, interval; /* in jiffies */
+ char valid; /* zero until following fields are valid */
/* registers values */
- u8 local_h, local_l; /* local */
- u8 remote1_h, remote1_l; /* remote1 */
- u8 remote2_h, remote2_l; /* remote2 */
+ u8 temp[ARRAY_SIZE(lm95241_reg_address)];
u8 config, model, trutherm;
};
+/* Conversions */
+static int TempFromReg(u8 val_h, u8 val_l)
+{
+ if (val_h & 0x80)
+ return val_h - 0x100;
+ return val_h * 1000 + val_l * 1000 / 256;
+}
+
+static struct lm95241_data *lm95241_update_device(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ mutex_lock(&data->update_lock);
+
+ if (time_after(jiffies, data->last_updated + data->interval) ||
+ !data->valid) {
+ int i;
+
+ dev_dbg(&client->dev, "Updating lm95241 data.\n");
+ for (i = 0; i < ARRAY_SIZE(lm95241_reg_address); i++)
+ data->temp[i]
+ = i2c_smbus_read_byte_data(client,
+ lm95241_reg_address[i]);
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ mutex_unlock(&data->update_lock);
+
+ return data;
+}
+
/* Sysfs stuff */
-#define show_temp(value) \
-static ssize_t show_##value(struct device *dev, \
- struct device_attribute *attr, char *buf) \
-{ \
- struct lm95241_data *data = lm95241_update_device(dev); \
- snprintf(buf, PAGE_SIZE - 1, "%d\n", \
- TEMP_FROM_REG(data->value##_h, data->value##_l)); \
- return strlen(buf); \
+static ssize_t show_input(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct lm95241_data *data = lm95241_update_device(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%d\n",
+ TempFromReg(data->temp[to_sensor_dev_attr(attr)->index],
+ data->temp[to_sensor_dev_attr(attr)->index + 1]));
}
-show_temp(local);
-show_temp(remote1);
-show_temp(remote2);
-static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
+static ssize_t show_type(struct device *dev, struct device_attribute *attr,
char *buf)
{
- struct lm95241_data *data = lm95241_update_device(dev);
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
- snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval / HZ);
- return strlen(buf);
+ return snprintf(buf, PAGE_SIZE - 1,
+ data->model & to_sensor_dev_attr(attr)->index ? "1\n" : "2\n");
}
-static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
+static ssize_t set_type(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct lm95241_data *data = i2c_get_clientdata(client);
unsigned long val;
+ int shift;
+ u8 mask = to_sensor_dev_attr(attr)->index;
if (strict_strtoul(buf, 10, &val) < 0)
return -EINVAL;
+ if (val != 1 && val != 2)
+ return -EINVAL;
- data->interval = val * HZ / 1000;
+ shift = mask == R1MS_MASK ? TT1_SHIFT : TT2_SHIFT;
+
+ mutex_lock(&data->update_lock);
+
+ data->trutherm &= ~(TT_MASK << shift);
+ if (val == 1) {
+ data->model |= mask;
+ data->trutherm |= (TT_ON << shift);
+ } else {
+ data->model &= ~mask;
+ data->trutherm |= (TT_OFF << shift);
+ }
+ data->valid = 0;
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
+ data->model);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
+ data->trutherm);
+
+ mutex_unlock(&data->update_lock);
return count;
}
-#define show_type(flag) \
-static ssize_t show_type##flag(struct device *dev, \
- struct device_attribute *attr, char *buf) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct lm95241_data *data = i2c_get_clientdata(client); \
-\
- snprintf(buf, PAGE_SIZE - 1, \
- data->model & R##flag##MS_MASK ? "1\n" : "2\n"); \
- return strlen(buf); \
+static ssize_t show_min(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ return snprintf(buf, PAGE_SIZE - 1,
+ data->config & to_sensor_dev_attr(attr)->index ?
+ "-127000\n" : "0\n");
}
-show_type(1);
-show_type(2);
-
-#define show_min(flag) \
-static ssize_t show_min##flag(struct device *dev, \
- struct device_attribute *attr, char *buf) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct lm95241_data *data = i2c_get_clientdata(client); \
-\
- snprintf(buf, PAGE_SIZE - 1, \
- data->config & R##flag##DF_MASK ? \
- "-127000\n" : "0\n"); \
- return strlen(buf); \
+
+static ssize_t set_min(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+ long val;
+
+ if (strict_strtol(buf, 10, &val) < 0)
+ return -EINVAL;
+ if (val < -128000)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+
+ if (val < 0)
+ data->config |= to_sensor_dev_attr(attr)->index;
+ else
+ data->config &= ~to_sensor_dev_attr(attr)->index;
+ data->valid = 0;
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
+
+ mutex_unlock(&data->update_lock);
+
+ return count;
}
-show_min(1);
-show_min(2);
-
-#define show_max(flag) \
-static ssize_t show_max##flag(struct device *dev, \
- struct device_attribute *attr, char *buf) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct lm95241_data *data = i2c_get_clientdata(client); \
-\
- snprintf(buf, PAGE_SIZE - 1, \
- data->config & R##flag##DF_MASK ? \
- "127000\n" : "255000\n"); \
- return strlen(buf); \
+
+static ssize_t show_max(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ return snprintf(buf, PAGE_SIZE - 1,
+ data->config & to_sensor_dev_attr(attr)->index ?
+ "127000\n" : "255000\n");
}
-show_max(1);
-show_max(2);
-
-#define set_type(flag) \
-static ssize_t set_type##flag(struct device *dev, \
- struct device_attribute *attr, \
- const char *buf, size_t count) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct lm95241_data *data = i2c_get_clientdata(client); \
-\
- long val; \
-\
- if (strict_strtol(buf, 10, &val) < 0) \
- return -EINVAL; \
-\
- if ((val == 1) || (val == 2)) { \
-\
- mutex_lock(&data->update_lock); \
-\
- data->trutherm &= ~(TT_MASK << TT##flag##_SHIFT); \
- if (val == 1) { \
- data->model |= R##flag##MS_MASK; \
- data->trutherm |= (TT_ON << TT##flag##_SHIFT); \
- } \
- else { \
- data->model &= ~R##flag##MS_MASK; \
- data->trutherm |= (TT_OFF << TT##flag##_SHIFT); \
- } \
-\
- data->valid = 0; \
-\
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL, \
- data->model); \
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM, \
- data->trutherm); \
-\
- mutex_unlock(&data->update_lock); \
-\
- } \
- return count; \
+
+static ssize_t set_max(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+ long val;
+
+ if (strict_strtol(buf, 10, &val) < 0)
+ return -EINVAL;
+ if (val >= 256000)
+ return -EINVAL;
+
+ mutex_lock(&data->update_lock);
+
+ if (val <= 127000)
+ data->config |= to_sensor_dev_attr(attr)->index;
+ else
+ data->config &= ~to_sensor_dev_attr(attr)->index;
+ data->valid = 0;
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
+
+ mutex_unlock(&data->update_lock);
+
+ return count;
}
-set_type(1);
-set_type(2);
-
-#define set_min(flag) \
-static ssize_t set_min##flag(struct device *dev, \
- struct device_attribute *devattr, const char *buf, size_t count) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct lm95241_data *data = i2c_get_clientdata(client); \
-\
- long val; \
-\
- if (strict_strtol(buf, 10, &val) < 0) \
- return -EINVAL;\
-\
- mutex_lock(&data->update_lock); \
-\
- if (val < 0) \
- data->config |= R##flag##DF_MASK; \
- else \
- data->config &= ~R##flag##DF_MASK; \
-\
- data->valid = 0; \
-\
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, \
- data->config); \
-\
- mutex_unlock(&data->update_lock); \
-\
- return count; \
+
+static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct lm95241_data *data = lm95241_update_device(dev);
+
+ return snprintf(buf, PAGE_SIZE - 1, "%lu\n", 1000 * data->interval
+ / HZ);
}
-set_min(1);
-set_min(2);
-
-#define set_max(flag) \
-static ssize_t set_max##flag(struct device *dev, \
- struct device_attribute *devattr, const char *buf, size_t count) \
-{ \
- struct i2c_client *client = to_i2c_client(dev); \
- struct lm95241_data *data = i2c_get_clientdata(client); \
-\
- long val; \
-\
- if (strict_strtol(buf, 10, &val) < 0) \
- return -EINVAL; \
-\
- mutex_lock(&data->update_lock); \
-\
- if (val <= 127000) \
- data->config |= R##flag##DF_MASK; \
- else \
- data->config &= ~R##flag##DF_MASK; \
-\
- data->valid = 0; \
-\
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, \
- data->config); \
-\
- mutex_unlock(&data->update_lock); \
-\
- return count; \
+
+static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lm95241_data *data = i2c_get_clientdata(client);
+ unsigned long val;
+
+ if (strict_strtoul(buf, 10, &val) < 0)
+ return -EINVAL;
+
+ data->interval = val * HZ / 1000;
+
+ return count;
}
-set_max(1);
-set_max(2);
-
-static DEVICE_ATTR(temp1_input, S_IRUGO, show_local, NULL);
-static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote1, NULL);
-static DEVICE_ATTR(temp3_input, S_IRUGO, show_remote2, NULL);
-static DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type1, set_type1);
-static DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type2, set_type2);
-static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min1, set_min1);
-static DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min2, set_min2);
-static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max1, set_max1);
-static DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max2, set_max2);
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type, set_type,
+ R1MS_MASK);
+static SENSOR_DEVICE_ATTR(temp3_type, S_IWUSR | S_IRUGO, show_type, set_type,
+ R2MS_MASK);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min,
+ R1DF_MASK);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min,
+ R2DF_MASK);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max,
+ R1DF_MASK);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max,
+ R2DF_MASK);
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
set_interval);
static struct attribute *lm95241_attributes[] = {
- &dev_attr_temp1_input.attr,
- &dev_attr_temp2_input.attr,
- &dev_attr_temp3_input.attr,
- &dev_attr_temp2_type.attr,
- &dev_attr_temp3_type.attr,
- &dev_attr_temp2_min.attr,
- &dev_attr_temp3_min.attr,
- &dev_attr_temp2_max.attr,
- &dev_attr_temp3_max.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp3_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_type.dev_attr.attr,
+ &sensor_dev_attr_temp3_type.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp3_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp3_max.dev_attr.attr,
&dev_attr_update_interval.attr,
NULL
};
if ((i2c_smbus_read_byte_data(new_client, LM95241_REG_R_MAN_ID)
== MANUFACTURER_ID)
- && (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
- >= DEFAULT_REVISION)) {
- name = "lm95241";
+ && (i2c_smbus_read_byte_data(new_client, LM95241_REG_R_CHIP_ID)
+ >= DEFAULT_REVISION)) {
+ name = DEVNAME;
} else {
dev_dbg(&adapter->dev, "LM95241 detection failed at 0x%02x\n",
address);
return 0;
}
+static void lm95241_init_client(struct i2c_client *client)
+{
+ struct lm95241_data *data = i2c_get_clientdata(client);
+
+ data->interval = HZ; /* 1 sec default */
+ data->valid = 0;
+ data->config = CFG_CR0076;
+ data->model = 0;
+ data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
+
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG, data->config);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
+ R1FE_MASK | R2FE_MASK);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
+ data->trutherm);
+ i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
+ data->model);
+}
+
static int lm95241_probe(struct i2c_client *new_client,
const struct i2c_device_id *id)
{
return err;
}
-static void lm95241_init_client(struct i2c_client *client)
-{
- struct lm95241_data *data = i2c_get_clientdata(client);
-
- data->interval = HZ; /* 1 sec default */
- data->valid = 0;
- data->config = CFG_CR0076;
- data->model = 0;
- data->trutherm = (TT_OFF << TT1_SHIFT) | (TT_OFF << TT2_SHIFT);
-
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_CONFIG,
- data->config);
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_REM_FILTER,
- R1FE_MASK | R2FE_MASK);
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_TRUTHERM,
- data->trutherm);
- i2c_smbus_write_byte_data(client, LM95241_REG_RW_REMOTE_MODEL,
- data->model);
-}
-
static int lm95241_remove(struct i2c_client *client)
{
struct lm95241_data *data = i2c_get_clientdata(client);
return 0;
}
-static struct lm95241_data *lm95241_update_device(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm95241_data *data = i2c_get_clientdata(client);
-
- mutex_lock(&data->update_lock);
-
- if (time_after(jiffies, data->last_updated + data->interval) ||
- !data->valid) {
- dev_dbg(&client->dev, "Updating lm95241 data.\n");
- data->local_h =
- i2c_smbus_read_byte_data(client,
- LM95241_REG_R_LOCAL_TEMPH);
- data->local_l =
- i2c_smbus_read_byte_data(client,
- LM95241_REG_R_LOCAL_TEMPL);
- data->remote1_h =
- i2c_smbus_read_byte_data(client,
- LM95241_REG_R_REMOTE1_TEMPH);
- data->remote1_l =
- i2c_smbus_read_byte_data(client,
- LM95241_REG_R_REMOTE1_TEMPL);
- data->remote2_h =
- i2c_smbus_read_byte_data(client,
- LM95241_REG_R_REMOTE2_TEMPH);
- data->remote2_l =
- i2c_smbus_read_byte_data(client,
- LM95241_REG_R_REMOTE2_TEMPL);
- data->last_updated = jiffies;
- data->valid = 1;
- }
-
- mutex_unlock(&data->update_lock);
-
- return data;
-}
-
/* Driver data (common to all clients) */
static const struct i2c_device_id lm95241_id[] = {
- { "lm95241", 0 },
+ { DEVNAME, 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lm95241_id);
static struct i2c_driver lm95241_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
- .name = "lm95241",
+ .name = DEVNAME,
},
.probe = lm95241_probe,
.remove = lm95241_remove,
i2c_del_driver(&lm95241_driver);
}
-MODULE_AUTHOR("Davide Rizzo <elpa-rizzo@gmail.com>");
+MODULE_AUTHOR("Davide Rizzo <elpa.rizzo@gmail.com>");
MODULE_DESCRIPTION("LM95241 sensor driver");
MODULE_LICENSE("GPL");
projects / openwrt / staging / blogic.git / commitdiff