[PATCH 8/9] hwmon: lm75: expose to thermal fw via DT nodes
This patch adds to lm75 temperature sensor the possibility
to expose itself as thermal zone device, registered on the
thermal framework.
The thermal zone is built only if a device tree node
describing a thermal zone for this sensor is present
inside the lm75 DT node. Otherwise, the driver behavior
will be the same.
Cc: Jean Delvare
Cc: Guenter Roeck
Cc: lm-sens...@lm-sensors.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin
---
drivers/hwmon/lm75.c | 29 +
1 file changed, 29 insertions(+)
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index c03b490..0aa5e28 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -27,6 +27,8 @@
#include
#include
#include
+#include
+#include
#include "lm75.h"
@@ -70,6 +72,7 @@ static const u8 LM75_REG_TEMP[3] = {
/* Each client has this additional data */
struct lm75_data {
struct device *hwmon_dev;
+ struct thermal_zone_device *tz;
struct mutexupdate_lock;
u8 orig_conf;
u8 resolution; /* In bits, between 9 and 12 */
@@ -92,6 +95,19 @@ static struct lm75_data *lm75_update_device(struct device
*dev);
/* sysfs attributes for hwmon */
+static int lm75_read_temp(void *dev, unsigned long *temp)
+{
+ struct lm75_data *data = lm75_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ *temp = ((data->temp[0] >> (16 - data->resolution)) * 1000) >>
+ (data->resolution - 8);
+
+ return 0;
+}
+
static ssize_t show_temp(struct device *dev, struct device_attribute *da,
char *buf)
{
@@ -271,11 +287,23 @@ lm75_probe(struct i2c_client *client, const struct
i2c_device_id *id)
goto exit_remove;
}
+ if (of_find_node_by_name(client->dev.of_node, "thermal_zone")) {
+ data->tz = thermal_zone_of_device_register(>dev,
+ >dev,
+ lm75_read_temp);
+ if (IS_ERR(data->tz)) {
+ status = PTR_ERR(data->tz);
+ goto exit_hwmon;
+ }
+ }
+
dev_info(>dev, "%s: sensor '%s'\n",
dev_name(data->hwmon_dev), client->name);
return 0;
+exit_hwmon:
+ hwmon_device_unregister(data->hwmon_dev);
exit_remove:
sysfs_remove_group(>dev.kobj, _group);
return status;
@@ -285,6 +313,7 @@ static int lm75_remove(struct i2c_client *client)
{
struct lm75_data *data = i2c_get_clientdata(client);
+ thermal_zone_device_unregister(data->tz);
hwmon_device_unregister(data->hwmon_dev);
sysfs_remove_group(>dev.kobj, _group);
lm75_write_value(client, LM75_REG_CONF, data->orig_conf);
--
1.8.2.1.342.gfa7285d
--
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[PATCH 8/9] hwmon: lm75: expose to thermal fw via DT nodes
This patch adds to lm75 temperature sensor the possibility
to expose itself as thermal zone device, registered on the
thermal framework.
The thermal zone is built only if a device tree node
describing a thermal zone for this sensor is present
inside the lm75 DT node. Otherwise, the driver behavior
will be the same.
Cc: Jean Delvare kh...@linux-fr.org
Cc: Guenter Roeck li...@roeck-us.net
Cc: lm-sens...@lm-sensors.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin eduardo.valen...@ti.com
---
drivers/hwmon/lm75.c | 29 +
1 file changed, 29 insertions(+)
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index c03b490..0aa5e28 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/thermal.h
+#include linux/of.h
#include lm75.h
@@ -70,6 +72,7 @@ static const u8 LM75_REG_TEMP[3] = {
/* Each client has this additional data */
struct lm75_data {
struct device *hwmon_dev;
+ struct thermal_zone_device *tz;
struct mutexupdate_lock;
u8 orig_conf;
u8 resolution; /* In bits, between 9 and 12 */
@@ -92,6 +95,19 @@ static struct lm75_data *lm75_update_device(struct device
*dev);
/* sysfs attributes for hwmon */
+static int lm75_read_temp(void *dev, unsigned long *temp)
+{
+ struct lm75_data *data = lm75_update_device(dev);
+
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+
+ *temp = ((data-temp[0] (16 - data-resolution)) * 1000)
+ (data-resolution - 8);
+
+ return 0;
+}
+
static ssize_t show_temp(struct device *dev, struct device_attribute *da,
char *buf)
{
@@ -271,11 +287,23 @@ lm75_probe(struct i2c_client *client, const struct
i2c_device_id *id)
goto exit_remove;
}
+ if (of_find_node_by_name(client-dev.of_node, thermal_zone)) {
+ data-tz = thermal_zone_of_device_register(client-dev,
+ client-dev,
+ lm75_read_temp);
+ if (IS_ERR(data-tz)) {
+ status = PTR_ERR(data-tz);
+ goto exit_hwmon;
+ }
+ }
+
dev_info(client-dev, %s: sensor '%s'\n,
dev_name(data-hwmon_dev), client-name);
return 0;
+exit_hwmon:
+ hwmon_device_unregister(data-hwmon_dev);
exit_remove:
sysfs_remove_group(client-dev.kobj, lm75_group);
return status;
@@ -285,6 +313,7 @@ static int lm75_remove(struct i2c_client *client)
{
struct lm75_data *data = i2c_get_clientdata(client);
+ thermal_zone_device_unregister(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);
--
1.8.2.1.342.gfa7285d
--
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the body of a message to majord...@vger.kernel.org
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Please read the FAQ at http://www.tux.org/lkml/
