On Fri, Aug 23, 2013 at 07:15:44PM -0400, 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.
>
> 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/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;
> + }
> + }
> +
I don't think it should be fatal if thermal_zone_of_device_register fails.
hwmon itself still works fine, and should not be penaltized for a thermal
subsystem failure. Better display a warning if that happens and don't bail out.
The same comment applies to all patches affecting the hwmon subsystem.
> 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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