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Date: Thu, 12 Jun 2008 09:26:03 +0800
From: Zhang Rui <rui.zhang@...el.com>
To: Matthew Garrett <mjg59@...f.ucam.org>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Clean up thermal API
On Wed, 2008-06-11 at 18:06 +0800, Matthew Garrett wrote:
> The thermal layer passes temperatures around as strings. This is fine
> for sysfs, but makes it hard to use them for other purposes in-kernel.
> Change them to longs and do the string conversion in the
> sysfs-specific
> code.
this patch looks okay,
except that it has some codingstyle problems and failed to pass
checkpatch.
thanks,
rui
>
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
>
> ---
>
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index 504385b..28b3782 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -886,7 +886,8 @@ static void acpi_thermal_check(void *data)
> /* sys I/F for generic thermal sysfs support */
> #define KELVIN_TO_MILLICELSIUS(t) (t * 100 - 273200)
>
> -static int thermal_get_temp(struct thermal_zone_device *thermal, char
> *buf)
> +static int thermal_get_temp(struct thermal_zone_device *thermal,
> + unsigned long *temp)
> {
> struct acpi_thermal *tz = thermal->devdata;
> int result;
> @@ -898,7 +899,8 @@ static int thermal_get_temp(struct
> thermal_zone_device *thermal, char *buf)
> if (result)
> return result;
>
> - return sprintf(buf, "%ld\n",
> KELVIN_TO_MILLICELSIUS(tz->temperature));
> + *temp = KELVIN_TO_MILLICELSIUS(tz->temperature);
> + return 0;
> }
>
> static const char enabled[] = "kernel";
> @@ -982,7 +984,7 @@ static int thermal_get_trip_type(struct
> thermal_zone_device *thermal,
> }
>
> static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
> - int trip, char *buf)
> + int trip, unsigned long *temp)
> {
> struct acpi_thermal *tz = thermal->devdata;
> int i;
> @@ -991,31 +993,40 @@ static int thermal_get_trip_temp(struct
> thermal_zone_device *thermal,
> return -EINVAL;
>
> if (tz->trips.critical.flags.valid) {
> - if (!trip)
> - return sprintf(buf, "%ld\n",
> KELVIN_TO_MILLICELSIUS(
> - tz->trips.critical.temperature));
> + if (!trip) {
> + *temp = KELVIN_TO_MILLICELSIUS(
> + tz->trips.critical.temperature);
> + return 0;
> + }
> +
> trip--;
> }
>
> if (tz->trips.hot.flags.valid) {
> - if (!trip)
> - return sprintf(buf, "%ld\n",
> KELVIN_TO_MILLICELSIUS(
> - tz->trips.hot.temperature));
> + if (!trip) {
> + *temp = KELVIN_TO_MILLICELSIUS(
> + tz->trips.hot.temperature);
> + return 0;
> + }
> trip--;
> }
>
> if (tz->trips.passive.flags.valid) {
> - if (!trip)
> - return sprintf(buf, "%ld\n",
> KELVIN_TO_MILLICELSIUS(
> -
> tz->trips.passive.temperature));
> + if (!trip) {
> + *temp = KELVIN_TO_MILLICELSIUS(
> + tz->trips.passive.temperature);
> + return 0;
> + }
> trip--;
> }
>
> for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
> tz->trips.active[i].flags.valid; i++) {
> - if (!trip)
> - return sprintf(buf, "%ld\n",
> KELVIN_TO_MILLICELSIUS(
> -
> tz->trips.active[i].temperature));
> + if (!trip) {
> + *temp = KELVIN_TO_MILLICELSIUS(
> + tz->trips.active[i].temperature);
> + return 0;
> + }
> trip--;
> }
>
> diff --git a/drivers/thermal/thermal_sys.c
> b/drivers/thermal/thermal_sys.c
> index 6098787..c537a5b 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -104,11 +104,18 @@ static ssize_t
> temp_show(struct device *dev, struct device_attribute *attr, char
> *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> + long temperature;
> + int ret;
>
> if (!tz->ops->get_temp)
> return -EPERM;
>
> - return tz->ops->get_temp(tz, buf);
> + ret = tz->ops->get_temp(tz,&temperature);
> +
> + if (ret)
> + return ret;
> +
> + return sprintf(buf,"%ld\n",temperature);
> }
>
> static ssize_t
> @@ -160,7 +167,8 @@ trip_point_temp_show(struct device *dev, struct
> device_attribute *attr,
> char *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> - int trip;
> + int trip, ret;
> + long temperature;
>
> if (!tz->ops->get_trip_temp)
> return -EPERM;
> @@ -168,7 +176,12 @@ trip_point_temp_show(struct device *dev, struct
> device_attribute *attr,
> if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
> return -EINVAL;
>
> - return tz->ops->get_trip_temp(tz, trip, buf);
> + ret = tz->ops->get_trip_temp(tz, trip, &temperature);
> +
> + if (ret)
> + return ret;
> +
> + return sprintf (buf, "%ld\n", temperature);
> }
>
> static DEVICE_ATTR(type, 0444, type_show, NULL);
> @@ -312,13 +325,20 @@ static DEVICE_ATTR(name, 0444, name_show, NULL);
> static ssize_t
> temp_input_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> + long temperature;
> + int ret;
> struct thermal_hwmon_attr *hwmon_attr
> = container_of(attr, struct
> thermal_hwmon_attr, attr);
> struct thermal_zone_device *tz
> = container_of(hwmon_attr, struct
> thermal_zone_device,
> temp_input);
>
> - return tz->ops->get_temp(tz, buf);
> + ret = tz->ops->get_temp(tz, &temperature);
> +
> + if (ret)
> + return ret;
> +
> + return sprintf(buf, "%ld\n", temperature);
> }
>
> static ssize_t
> @@ -330,8 +350,14 @@ temp_crit_show(struct device *dev, struct
> device_attribute *attr,
> struct thermal_zone_device *tz
> = container_of(hwmon_attr, struct
> thermal_zone_device,
> temp_crit);
> + long temperature;
> + int ret;
> +
> + ret = tz->ops->get_trip_temp(tz, 0, &temperature);
> + if (ret)
> + return ret;
>
> - return tz->ops->get_trip_temp(tz, 0, buf);
> + return sprintf(buf, "%ld\n", temperature);
> }
>
>
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 06d3e6e..63e6619 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -36,11 +36,12 @@ struct thermal_zone_device_ops {
> struct thermal_cooling_device *);
> int (*unbind) (struct thermal_zone_device *,
> struct thermal_cooling_device *);
> - int (*get_temp) (struct thermal_zone_device *, char *);
> + int (*get_temp) (struct thermal_zone_device *, unsigned long
> *);
> int (*get_mode) (struct thermal_zone_device *, char *);
> int (*set_mode) (struct thermal_zone_device *, const char *);
> int (*get_trip_type) (struct thermal_zone_device *, int, char
> *);
> - int (*get_trip_temp) (struct thermal_zone_device *, int, char
> *);
> + int (*get_trip_temp) (struct thermal_zone_device *, int,
> + unsigned long *);
> int (*get_crit_temp) (struct thermal_zone_device *, unsigned
> long *);
> };
>
>
> --
> Matthew Garrett | mjg59@...f.ucam.org
>
>
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