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path: root/drivers/hwmon/lm75.c
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Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c92
1 files changed, 85 insertions, 7 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 291edfff55bf..c03b490bba81 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -38,6 +38,7 @@ enum lm75_type { /* keep sorted in alphabetical order */
adt75,
ds1775,
ds75,
+ ds7505,
lm75,
lm75a,
max6625,
@@ -71,9 +72,12 @@ struct lm75_data {
struct device *hwmon_dev;
struct mutex update_lock;
u8 orig_conf;
+ u8 resolution; /* In bits, between 9 and 12 */
+ u8 resolution_limits;
char valid; /* !=0 if registers are valid */
unsigned long last_updated; /* In jiffies */
- u16 temp[3]; /* Register values,
+ unsigned long sample_time; /* In jiffies */
+ s16 temp[3]; /* Register values,
0 = input
1 = max
2 = hyst */
@@ -93,12 +97,15 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *da,
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm75_data *data = lm75_update_device(dev);
+ long temp;
if (IS_ERR(data))
return PTR_ERR(data);
- return sprintf(buf, "%d\n",
- LM75_TEMP_FROM_REG(data->temp[attr->index]));
+ temp = ((data->temp[attr->index] >> (16 - data->resolution)) * 1000)
+ >> (data->resolution - 8);
+
+ return sprintf(buf, "%ld\n", temp);
}
static ssize_t set_temp(struct device *dev, struct device_attribute *da,
@@ -110,13 +117,25 @@ static ssize_t set_temp(struct device *dev, struct device_attribute *da,
int nr = attr->index;
long temp;
int error;
+ u8 resolution;
error = kstrtol(buf, 10, &temp);
if (error)
return error;
+ /*
+ * Resolution of limit registers is assumed to be the same as the
+ * temperature input register resolution unless given explicitly.
+ */
+ if (attr->index && data->resolution_limits)
+ resolution = data->resolution_limits;
+ else
+ resolution = data->resolution;
+
mutex_lock(&data->update_lock);
- data->temp[nr] = LM75_TEMP_TO_REG(temp);
+ temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX);
+ data->temp[nr] = DIV_ROUND_CLOSEST(temp << (resolution - 8),
+ 1000) << (16 - resolution);
lm75_write_value(client, LM75_REG_TEMP[nr], data->temp[nr]);
mutex_unlock(&data->update_lock);
return count;
@@ -151,6 +170,7 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
int status;
u8 set_mask, clr_mask;
int new;
+ enum lm75_type kind = id->driver_data;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
@@ -167,8 +187,65 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
* Then tweak to be more precise when appropriate.
*/
set_mask = 0;
- clr_mask = (1 << 0) /* continuous conversions */
- | (1 << 6) | (1 << 5); /* 9-bit mode */
+ clr_mask = LM75_SHUTDOWN; /* continuous conversions */
+
+ switch (kind) {
+ case adt75:
+ clr_mask |= 1 << 5; /* not one-shot mode */
+ data->resolution = 12;
+ data->sample_time = HZ / 8;
+ break;
+ case ds1775:
+ case ds75:
+ case stds75:
+ clr_mask |= 3 << 5;
+ set_mask |= 2 << 5; /* 11-bit mode */
+ data->resolution = 11;
+ data->sample_time = HZ;
+ break;
+ case ds7505:
+ set_mask |= 3 << 5; /* 12-bit mode */
+ data->resolution = 12;
+ data->sample_time = HZ / 4;
+ break;
+ case lm75:
+ case lm75a:
+ data->resolution = 9;
+ data->sample_time = HZ / 2;
+ break;
+ case max6625:
+ data->resolution = 9;
+ data->sample_time = HZ / 4;
+ break;
+ case max6626:
+ data->resolution = 12;
+ data->resolution_limits = 9;
+ data->sample_time = HZ / 4;
+ break;
+ case tcn75:
+ data->resolution = 9;
+ data->sample_time = HZ / 8;
+ break;
+ case mcp980x:
+ data->resolution_limits = 9;
+ /* fall through */
+ case tmp100:
+ case tmp101:
+ set_mask |= 3 << 5; /* 12-bit mode */
+ data->resolution = 12;
+ data->sample_time = HZ;
+ clr_mask |= 1 << 7; /* not one-shot mode */
+ break;
+ case tmp105:
+ case tmp175:
+ case tmp275:
+ case tmp75:
+ set_mask |= 3 << 5; /* 12-bit mode */
+ clr_mask |= 1 << 7; /* not one-shot mode */
+ data->resolution = 12;
+ data->sample_time = HZ / 2;
+ break;
+ }
/* configure as specified */
status = lm75_read_value(client, LM75_REG_CONF);
@@ -218,6 +295,7 @@ static const struct i2c_device_id lm75_ids[] = {
{ "adt75", adt75, },
{ "ds1775", ds1775, },
{ "ds75", ds75, },
+ { "ds7505", ds7505, },
{ "lm75", lm75, },
{ "lm75a", lm75a, },
{ "max6625", max6625, },
@@ -407,7 +485,7 @@ static struct lm75_data *lm75_update_device(struct device *dev)
mutex_lock(&data->update_lock);
- if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
+ if (time_after(jiffies, data->last_updated + data->sample_time)
|| !data->valid) {
int i;
dev_dbg(&client->dev, "Starting lm75 update\n");