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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.c163
1 files changed, 129 insertions, 34 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 291edfff55b..479ffbeed3f 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -27,6 +27,8 @@
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/thermal.h>
#include "lm75.h"
@@ -38,6 +40,8 @@ enum lm75_type { /* keep sorted in alphabetical order */
adt75,
ds1775,
ds75,
+ ds7505,
+ g751,
lm75,
lm75a,
max6625,
@@ -68,12 +72,17 @@ static const u8 LM75_REG_TEMP[3] = {
/* Each client has this additional data */
struct lm75_data {
+ struct i2c_client *client;
struct device *hwmon_dev;
+ struct thermal_zone_device *tz;
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 */
@@ -86,8 +95,25 @@ static struct lm75_data *lm75_update_device(struct device *dev);
/*-----------------------------------------------------------------------*/
+static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
+{
+ return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8);
+}
+
/* sysfs attributes for hwmon */
+static int lm75_read_temp(void *dev, long *temp)
+{
+ struct lm75_data *data = lm75_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ *temp = lm75_reg_to_mc(data->temp[0], data->resolution);
+
+ return 0;
+}
+
static ssize_t show_temp(struct device *dev, struct device_attribute *da,
char *buf)
{
@@ -97,26 +123,38 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *da,
if (IS_ERR(data))
return PTR_ERR(data);
- return sprintf(buf, "%d\n",
- LM75_TEMP_FROM_REG(data->temp[attr->index]));
+ return sprintf(buf, "%ld\n", lm75_reg_to_mc(data->temp[attr->index],
+ data->resolution));
}
static ssize_t set_temp(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
- struct i2c_client *client = to_i2c_client(dev);
- struct lm75_data *data = i2c_get_clientdata(client);
+ struct lm75_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
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;
@@ -128,17 +166,14 @@ static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
show_temp, set_temp, 2);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
-static struct attribute *lm75_attributes[] = {
+static struct attribute *lm75_attrs[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
NULL
};
-
-static const struct attribute_group lm75_group = {
- .attrs = lm75_attributes,
-};
+ATTRIBUTE_GROUPS(lm75);
/*-----------------------------------------------------------------------*/
@@ -147,19 +182,22 @@ static const struct attribute_group lm75_group = {
static int
lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
+ struct device *dev = &client->dev;
struct lm75_data *data;
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))
return -EIO;
- data = devm_kzalloc(&client->dev, sizeof(struct lm75_data), GFP_KERNEL);
+ data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
+ data->client = client;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
@@ -167,13 +205,71 @@ 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 g751:
+ 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);
if (status < 0) {
- dev_dbg(&client->dev, "Can't read config? %d\n", status);
+ dev_dbg(dev, "Can't read config? %d\n", status);
return status;
}
data->orig_conf = status;
@@ -181,35 +277,32 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
new |= set_mask;
if (status != new)
lm75_write_value(client, LM75_REG_CONF, new);
- dev_dbg(&client->dev, "Config %02x\n", new);
+ dev_dbg(dev, "Config %02x\n", new);
- /* Register sysfs hooks */
- status = sysfs_create_group(&client->dev.kobj, &lm75_group);
- if (status)
- return status;
+ data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
+ data, lm75_groups);
+ if (IS_ERR(data->hwmon_dev))
+ return PTR_ERR(data->hwmon_dev);
- data->hwmon_dev = hwmon_device_register(&client->dev);
- if (IS_ERR(data->hwmon_dev)) {
- status = PTR_ERR(data->hwmon_dev);
- goto exit_remove;
- }
+ data->tz = thermal_zone_of_sensor_register(data->hwmon_dev,
+ 0,
+ data->hwmon_dev,
+ lm75_read_temp, NULL);
+ if (IS_ERR(data->tz))
+ data->tz = NULL;
- dev_info(&client->dev, "%s: sensor '%s'\n",
+ dev_info(dev, "%s: sensor '%s'\n",
dev_name(data->hwmon_dev), client->name);
return 0;
-
-exit_remove:
- sysfs_remove_group(&client->dev.kobj, &lm75_group);
- return status;
}
static int lm75_remove(struct i2c_client *client)
{
struct lm75_data *data = i2c_get_clientdata(client);
+ thermal_zone_of_sensor_unregister(data->hwmon_dev, data->tz);
hwmon_device_unregister(data->hwmon_dev);
- sysfs_remove_group(&client->dev.kobj, &lm75_group);
lm75_write_value(client, LM75_REG_CONF, data->orig_conf);
return 0;
}
@@ -218,6 +311,8 @@ static const struct i2c_device_id lm75_ids[] = {
{ "adt75", adt75, },
{ "ds1775", ds1775, },
{ "ds75", ds75, },
+ { "ds7505", ds7505, },
+ { "g751", g751, },
{ "lm75", lm75, },
{ "lm75a", lm75a, },
{ "max6625", max6625, },
@@ -401,13 +496,13 @@ static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value)
static struct lm75_data *lm75_update_device(struct device *dev)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm75_data *data = i2c_get_clientdata(client);
+ struct lm75_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = data->client;
struct lm75_data *ret = data;
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");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 14:09:48 +0000