Messages in this thread | | | Date | Tue, 27 Aug 2013 11:26:08 +0100 | From | Mark Rutland <> | Subject | Re: [RFC PATCH 03/14] hwmon: lm75: expose to thermal fw via DT nodes |
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On Sat, Aug 24, 2013 at 12:15:44AM +0100, Eduardo Valentin wrote: > 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.
There'll need to be a binding document if you're extending the lm75 binding. See the comment at the top of [1]. However, I don't think you need this at all, as I explain in my comments on the previous patch.
Thanks, Mark.
[1] Documentation/devicetree/bindings/i2c/trivial-devices.txt
> > Cc: Jean Delvare <khali@linux-fr.org> > Cc: Guenter Roeck <linux@roeck-us.net> > Cc: lm-sensors@lm-sensors.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> > --- > drivers/hwmon/lm75.c | 31 +++++++++++++++++++++++++++++++ > 1 file changed, 31 insertions(+) > > diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c > index c03b490..dc55908 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 mutex update_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 +287,25 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) > goto exit_remove; > } > > + if (of_find_property(client->dev.of_node, "monitored-zones", NULL)) { > + data->tz = thermal_zone_of_device_register(&client->dev, > + 0, > + false, /* -hwmon */ > + &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 +315,7 @@ 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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