On 15-09-2013 19:33, Guenter Roeck wrote: > On 09/15/2013 03:02 PM, Eduardo Valentin wrote: >> This patch adds to tmp102 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 tmp102 DT node. Otherwise, the driver behavior >> will be the same. >> >> Cc: Jean Delvare <khali@xxxxxxxxxxxx> >> Cc: Guenter Roeck <linux@xxxxxxxxxxxx> >> Cc: lm-sensors@xxxxxxxxxxxxxx >> Cc: linux-kernel@xxxxxxxxxxxxxxx >> Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxx> >> --- >> drivers/hwmon/tmp102.c | 28 ++++++++++++++++++++++++++++ >> 1 file changed, 28 insertions(+) >> >> diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c >> index d7b47ab..e432444 100644 >> --- a/drivers/hwmon/tmp102.c >> +++ b/drivers/hwmon/tmp102.c >> @@ -27,6 +27,8 @@ >> #include <linux/mutex.h> >> #include <linux/device.h> >> #include <linux/jiffies.h> >> +#include <linux/thermal.h> >> +#include <linux/of.h> >> >> #define DRIVER_NAME "tmp102" >> >> @@ -50,6 +52,7 @@ >> >> struct tmp102 { >> struct device *hwmon_dev; >> + struct thermal_zone_device *tz; >> struct mutex lock; >> u16 config_orig; >> unsigned long last_update; >> @@ -93,6 +96,19 @@ static struct tmp102 *tmp102_update_device(struct >> i2c_client *client) >> return tmp102; >> } >> >> +static int tmp102_read_temp(void *dev, long *temp) >> +{ >> + struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev)); >> + >> + if (tmp102->temp[0] < 0) >> + dev_warn(tmp102->hwmon_dev, >> + "operating in negative temp: %d\n", tmp102->temp[0]); >> + > > Please drop this warning. > Done for both drivers. > Guenter > >> + *temp = tmp102->temp[0]; >> + >> + return 0; >> +} >> + >> static ssize_t tmp102_show_temp(struct device *dev, >> struct device_attribute *attr, >> char *buf) >> @@ -204,6 +220,16 @@ static int tmp102_probe(struct i2c_client *client, >> goto fail_remove_sysfs; >> } >> >> + tmp102->tz = thermal_zone_of_sensor_register(&client->dev, 0, >> + &client->dev, >> + tmp102_read_temp, NULL); >> + if (IS_ERR(tmp102->tz)) { >> + dev_warn(&client->dev, >> + "Could not parse thermal data in device tree: %ld\n", >> + PTR_ERR(tmp102->tz)); > > Please drop this warning. You already create error messages in > thermal_zone_of_sensor_register(). That should be sufficient. > The same applies to the lm75 patch. OK. Done for both. > > As a side note, I would suggest to provide devm_ functions for > registration. > We are introducing those for hwmon registration, which enables us to remove > most _remove functions. It would be great if we can keep it that way. > Right. This side note is taken. Actually this is on my todo list for quite a while. But I believe this should not block this series, should it? I will be probably cleaning the thermal framework code after this current work is accepted at least. > On a higher level, I don't think it is a good idea to make thermal zones > and thermal zone data mandatory. Many systems may neither need nor want it. > Well, I agree with you. Did you see something hard required in the patch I sent. I made it so that it could continue the driver probe without thermal zones, as you requested. I will repost both patches in reply to our thread. Eduardo > Guenter > >> + tmp102->tz = NULL; >> + } >> + >> dev_info(&client->dev, "initialized\n"); >> >> return 0; >> @@ -220,6 +246,8 @@ static int tmp102_remove(struct i2c_client *client) >> { >> struct tmp102 *tmp102 = i2c_get_clientdata(client); >> >> + /* thermal zone life cycle is not our responsibility */ >> + thermal_zone_of_sensor_unregister(&client->dev, tmp102->tz); >> hwmon_device_unregister(tmp102->hwmon_dev); >> sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); >> >> > > > -- You have got to be excited about what you are doing. (L. Lamport) Eduardo Valentin
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