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Date: Tue, 8 Feb 2011 14:16:06 +0100
From: Dirk Eibach <eibach@...ys.de>
To: linux-kernel@...r.kernel.org
Cc: khali@...ux-fr.org, guenter.roeck@...csson.com,
lm-sensors@...sensors.org, Dirk Eibach <eibach@...ys.de>
Subject: [PATCH] hwmon: Consider LM64 temperature offset
LM64 has 16 degrees Celsius temperature offset on all
remote sensor registers.
This was not considered When LM64 support was added to lm63.c.
Signed-off-by: Dirk Eibach <eibach@...ys.de>
---
drivers/hwmon/lm63.c | 34 +++++++++++++++++++++++++++++-----
1 files changed, 29 insertions(+), 5 deletions(-)
diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c
index 776aeb3..87bfefb 100644
--- a/drivers/hwmon/lm63.c
+++ b/drivers/hwmon/lm63.c
@@ -98,6 +98,9 @@ static const unsigned short normal_i2c[] = { 0x18, 0x4c, 0x4e, I2C_CLIENT_END };
* value, it uses signed 8-bit values with LSB = 1 degree Celsius.
* For remote temperature, low and high limits, it uses signed 11-bit values
* with LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
+ * For LM64 the actual remote diode temperature is 16 degree Celsius higher
+ * than the register reading. Remote temperature setpoints have to be
+ * adapted accordingly.
*/
#define FAN_FROM_REG(reg) ((reg) == 0xFFFC || (reg) == 0 ? 0 : \
@@ -180,6 +183,7 @@ struct lm63_data {
2: remote high limit */
u8 temp2_crit_hyst;
u8 alarms;
+ bool is_lm64;
};
/*
@@ -255,6 +259,17 @@ static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[attr->index]));
}
+static ssize_t show_remote_temp8(struct device *dev,
+ struct device_attribute *devattr,
+ char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct lm63_data *data = lm63_update_device(dev);
+ int offset = data->is_lm64 ? 16000 : 0;
+ return sprintf(buf, "%d\n",
+ TEMP8_FROM_REG(data->temp8[attr->index]) + offset);
+}
+
static ssize_t set_temp8(struct device *dev, struct device_attribute *dummy,
const char *buf, size_t count)
{
@@ -274,7 +289,9 @@ static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct lm63_data *data = lm63_update_device(dev);
- return sprintf(buf, "%d\n", TEMP11_FROM_REG(data->temp11[attr->index]));
+ int offset = data->is_lm64 ? 16000 : 0;
+ return sprintf(buf, "%d\n",
+ TEMP11_FROM_REG(data->temp11[attr->index]) + offset);
}
static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
@@ -292,9 +309,10 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
struct lm63_data *data = i2c_get_clientdata(client);
long val = simple_strtol(buf, NULL, 10);
int nr = attr->index;
+ int offset = data->is_lm64 ? 16000 : 0;
mutex_lock(&data->update_lock);
- data->temp11[nr] = TEMP11_TO_REG(val);
+ data->temp11[nr] = TEMP11_TO_REG(val - offset);
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
data->temp11[nr] >> 8);
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
@@ -309,7 +327,8 @@ static ssize_t show_temp2_crit_hyst(struct device *dev, struct device_attribute
char *buf)
{
struct lm63_data *data = lm63_update_device(dev);
- return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[2])
+ int offset = data->is_lm64 ? 16000 : 0;
+ return sprintf(buf, "%d\n", TEMP8_FROM_REG(data->temp8[2]) + offset
- TEMP8_FROM_REG(data->temp2_crit_hyst));
}
@@ -320,11 +339,12 @@ static ssize_t set_temp2_crit_hyst(struct device *dev, struct device_attribute *
{
struct i2c_client *client = to_i2c_client(dev);
struct lm63_data *data = i2c_get_clientdata(client);
+ int offset = data->is_lm64 ? 16000 : 0;
long val = simple_strtol(buf, NULL, 10);
long hyst;
mutex_lock(&data->update_lock);
- hyst = TEMP8_FROM_REG(data->temp8[2]) - val;
+ hyst = TEMP8_FROM_REG(data->temp8[2]) + offset - val;
i2c_smbus_write_byte_data(client, LM63_REG_REMOTE_TCRIT_HYST,
HYST_TO_REG(hyst));
mutex_unlock(&data->update_lock);
@@ -364,7 +384,7 @@ static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 2);
-static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp8, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_remote_temp8, NULL, 2);
static DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_temp2_crit_hyst,
set_temp2_crit_hyst);
@@ -466,6 +486,7 @@ static int lm63_detect(struct i2c_client *new_client,
static int lm63_probe(struct i2c_client *new_client,
const struct i2c_device_id *id)
{
+ u8 chip_id;
struct lm63_data *data;
int err;
@@ -479,6 +500,9 @@ static int lm63_probe(struct i2c_client *new_client,
data->valid = 0;
mutex_init(&data->update_lock);
+ chip_id = i2c_smbus_read_byte_data(new_client, LM63_REG_CHIP_ID);
+ data->is_lm64 = (chip_id == 0x51);
+
/* Initialize the LM63 chip */
lm63_init_client(new_client);
--
1.5.6.5
--
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