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Date: Wed, 1 Oct 2008 22:32:09 +0200
From: Pavel Machek <pavel@...e.cz>
To: Matthew Garrett <mjg59@...f.ucam.org>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
rui.zhang@...el.com
Subject: Re: [PATCH v2] thermal: Make it simpler to use the thermal layer
inside the kernel
On Wed 2008-10-01 19:41:11, Matthew Garrett wrote:
> The thermal layer passes temperatures and trip point types around as
> strings. This is fine for sysfs, but makes it hard to use them for other
> purposes in-kernel. Move the string conversion to the sysfs-specific
> code.
>
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
Still acked. Can you mail it to Len Brown for inclusion, Cc: akpm in
case len is sleeping? It is quite obvious anyway -- passing strings is
bad.
> ---
>
> This version also moves the mode setting (user/kernel) away from using
> strings, which gets them out of the majority of the API.
>
> diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
> index 2655bc1..5487a98 100644
> --- a/drivers/acpi/fan.c
> +++ b/drivers/acpi/fan.c
> @@ -69,27 +69,30 @@ static struct acpi_driver acpi_fan_driver = {
> };
>
> /* thermal cooling device callbacks */
> -static int fan_get_max_state(struct thermal_cooling_device *cdev, char *buf)
> +static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned int
> + *state)
> {
> /* ACPI fan device only support two states: ON/OFF */
> - return sprintf(buf, "1\n");
> + *state = 1;
> + return 0;
> }
>
> -static int fan_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
> +static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned int
> + *state)
> {
> struct acpi_device *device = cdev->devdata;
> - int state;
> int result;
>
> if (!device)
> return -EINVAL;
>
> - result = acpi_bus_get_power(device->handle, &state);
> + result = acpi_bus_get_power(device->handle, state);
> if (result)
> return result;
>
> - return sprintf(buf, "%s\n", state == ACPI_STATE_D3 ? "0" :
> - (state == ACPI_STATE_D0 ? "1" : "unknown"));
> + *state = (*state == ACPI_STATE_D3 ? 0 :
> + (*state == ACPI_STATE_D0 ? 1 : -1));
> + return 0;
> }
>
> static int
> diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c
> index ef34b18..4bc094c 100644
> --- a/drivers/acpi/processor_thermal.c
> +++ b/drivers/acpi/processor_thermal.c
> @@ -374,7 +374,8 @@ static int acpi_processor_max_state(struct acpi_processor *pr)
> return max_state;
> }
> static int
> -processor_get_max_state(struct thermal_cooling_device *cdev, char *buf)
> +processor_get_max_state(struct thermal_cooling_device *cdev, unsigned int
> + *state)
> {
> struct acpi_device *device = cdev->devdata;
> struct acpi_processor *pr = acpi_driver_data(device);
> @@ -382,24 +383,24 @@ processor_get_max_state(struct thermal_cooling_device *cdev, char *buf)
> if (!device || !pr)
> return -EINVAL;
>
> - return sprintf(buf, "%d\n", acpi_processor_max_state(pr));
> + *state = acpi_processor_max_state(pr);
> + return 0;
> }
>
> static int
> -processor_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
> +processor_get_cur_state(struct thermal_cooling_device *cdev, unsigned int
> + *cur_state)
> {
> struct acpi_device *device = cdev->devdata;
> struct acpi_processor *pr = acpi_driver_data(device);
> - int cur_state;
>
> if (!device || !pr)
> return -EINVAL;
>
> - cur_state = cpufreq_get_cur_state(pr->id);
> + *cur_state = cpufreq_get_cur_state(pr->id);
> if (pr->flags.throttling)
> - cur_state += pr->throttling.state;
> -
> - return sprintf(buf, "%d\n", cur_state);
> + *cur_state += pr->throttling.state;
> + return 0;
> }
>
> static int
> diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
> index 9127036..2e4e2a1 100644
> --- a/drivers/acpi/thermal.c
> +++ b/drivers/acpi/thermal.c
> @@ -934,7 +934,8 @@ 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,
> + int *temp)
> {
> struct acpi_thermal *tz = thermal->devdata;
> int result;
> @@ -946,25 +947,25 @@ 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";
> -static const char disabled[] = "user";
> static int thermal_get_mode(struct thermal_zone_device *thermal,
> - char *buf)
> + enum thermal_mode_t *thermal_mode)
> {
> struct acpi_thermal *tz = thermal->devdata;
>
> if (!tz)
> return -EINVAL;
>
> - return sprintf(buf, "%s\n", tz->tz_enabled ?
> - enabled : disabled);
> + *thermal_mode = tz->tz_enabled ? THERMAL_MODE_KERNEL
> + : THERMAL_MODE_USER;
> + return 0;
> }
>
> static int thermal_set_mode(struct thermal_zone_device *thermal,
> - const char *buf)
> + enum thermal_mode_t thermal_mode)
> {
> struct acpi_thermal *tz = thermal->devdata;
> int enable;
> @@ -975,12 +976,10 @@ static int thermal_set_mode(struct thermal_zone_device *thermal,
> /*
> * enable/disable thermal management from ACPI thermal driver
> */
> - if (!strncmp(buf, enabled, sizeof enabled - 1))
> + if (thermal_mode == THERMAL_MODE_KERNEL)
> enable = 1;
> - else if (!strncmp(buf, disabled, sizeof disabled - 1))
> - enable = 0;
> else
> - return -EINVAL;
> + enable = 0;
>
> if (enable != tz->tz_enabled) {
> tz->tz_enabled = enable;
> @@ -993,7 +992,7 @@ static int thermal_set_mode(struct thermal_zone_device *thermal,
> }
>
> static int thermal_get_trip_type(struct thermal_zone_device *thermal,
> - int trip, char *buf)
> + int trip, enum thermal_trip_t *type)
> {
> struct acpi_thermal *tz = thermal->devdata;
> int i;
> @@ -1002,27 +1001,35 @@ static int thermal_get_trip_type(struct thermal_zone_device *thermal,
> return -EINVAL;
>
> if (tz->trips.critical.flags.valid) {
> - if (!trip)
> - return sprintf(buf, "critical\n");
> + if (!trip) {
> + *type = THERMAL_TRIP_CRITICAL;
> + return 0;
> + }
> trip--;
> }
>
> if (tz->trips.hot.flags.valid) {
> - if (!trip)
> - return sprintf(buf, "hot\n");
> + if (!trip) {
> + *type = THERMAL_TRIP_HOT;
> + return 0;
> + }
> trip--;
> }
>
> if (tz->trips.passive.flags.valid) {
> - if (!trip)
> - return sprintf(buf, "passive\n");
> + if (!trip) {
> + *type = THERMAL_TRIP_PASSIVE;
> + return 0;
> + }
> trip--;
> }
>
> for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
> tz->trips.active[i].flags.valid; i++) {
> - if (!trip)
> - return sprintf(buf, "active%d\n", i);
> + if (!trip) {
> + *type = THERMAL_TRIP_ACTIVE;
> + return 0;
> + }
> trip--;
> }
>
> @@ -1030,7 +1037,7 @@ 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, int *temp)
> {
> struct acpi_thermal *tz = thermal->devdata;
> int i;
> @@ -1039,31 +1046,40 @@ 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--;
> }
>
> @@ -1071,7 +1087,7 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
> }
>
> static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
> - unsigned long *temperature) {
> + int *temperature) {
> struct acpi_thermal *tz = thermal->devdata;
>
> if (tz->trips.critical.flags.valid) {
> diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> index e8a51a1..bac2901 100644
> --- a/drivers/acpi/video.c
> +++ b/drivers/acpi/video.c
> @@ -358,26 +358,30 @@ static struct output_properties acpi_output_properties = {
>
>
> /* thermal cooling device callbacks */
> -static int video_get_max_state(struct thermal_cooling_device *cdev, char *buf)
> +static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
> + int *state)
> {
> struct acpi_device *device = cdev->devdata;
> struct acpi_video_device *video = acpi_driver_data(device);
>
> - return sprintf(buf, "%d\n", video->brightness->count - 3);
> + *state = video->brightness->count - 3;
> + return 0;
> }
>
> -static int video_get_cur_state(struct thermal_cooling_device *cdev, char *buf)
> +static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
> + int *state)
> {
> struct acpi_device *device = cdev->devdata;
> struct acpi_video_device *video = acpi_driver_data(device);
> unsigned long level;
> - int state;
> + int offset;
>
> acpi_video_device_lcd_get_level_current(video, &level);
> - for (state = 2; state < video->brightness->count; state++)
> - if (level == video->brightness->levels[state])
> - return sprintf(buf, "%d\n",
> - video->brightness->count - state - 1);
> + for (offset = 2; offset < video->brightness->count; offset++)
> + if (level == video->brightness->levels[offset]) {
> + *state = video->brightness->count - offset - 1;
> + return 0;
> + }
>
> return -EINVAL;
> }
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index fe07462..c1f7e65 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -104,22 +104,41 @@ static ssize_t
> temp_show(struct device *dev, struct device_attribute *attr, char *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> + int 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, "%d\n", temperature);
> }
>
> static ssize_t
> mode_show(struct device *dev, struct device_attribute *attr, char *buf)
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> + enum thermal_mode_t mode;
> + int ret;
>
> if (!tz->ops->get_mode)
> return -EPERM;
>
> - return tz->ops->get_mode(tz, buf);
> + ret = tz->ops->get_mode(tz, &mode);
> +
> + if (ret)
> + return ret;
> +
> + if (mode == THERMAL_MODE_KERNEL)
> + return sprintf(buf, "%s\n", "kernel");
> + else if (mode == THERMAL_MODE_USER)
> + return sprintf(buf, "%s\n", "user");
> + else
> + return sprintf(buf, "%s\n", "unknown");
> }
>
> static ssize_t
> @@ -132,7 +151,13 @@ mode_store(struct device *dev, struct device_attribute *attr,
> if (!tz->ops->set_mode)
> return -EPERM;
>
> - result = tz->ops->set_mode(tz, buf);
> + if (!strncmp(buf, "kernel", count))
> + result = tz->ops->set_mode(tz, THERMAL_MODE_KERNEL);
> + else if (!strncmp(buf, "user", count))
> + result = tz->ops->set_mode(tz, THERMAL_MODE_USER);
> + else
> + return -EINVAL;
> +
> if (result)
> return result;
>
> @@ -145,6 +170,8 @@ trip_point_type_show(struct device *dev, struct device_attribute *attr,
> {
> struct thermal_zone_device *tz = to_thermal_zone(dev);
> int trip;
> + enum thermal_trip_t trip_type;
> + int ret;
>
> if (!tz->ops->get_trip_type)
> return -EPERM;
> @@ -152,7 +179,28 @@ trip_point_type_show(struct device *dev, struct device_attribute *attr,
> if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
> return -EINVAL;
>
> - return tz->ops->get_trip_type(tz, trip, buf);
> +
> + ret = tz->ops->get_trip_type(tz, trip, &trip_type);
> + if (ret)
> + return ret;
> +
> + switch (trip_type) {
> + case THERMAL_TRIP_CRITICAL:
> + return sprintf(buf, "critical\n");
> + break;
> + case THERMAL_TRIP_HOT:
> + return sprintf(buf, "hot\n");
> + break;
> + case THERMAL_TRIP_PASSIVE:
> + return sprintf(buf, "passive\n");
> + break;
> + case THERMAL_TRIP_ACTIVE:
> + return sprintf(buf, "active\n");
> + break;
> + default:
> + return sprintf(buf, "unknown\n");
> + break;
> + }
> }
>
> static ssize_t
> @@ -160,7 +208,8 @@ 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;
> + int temperature;
>
> if (!tz->ops->get_trip_temp)
> return -EPERM;
> @@ -168,7 +217,12 @@ 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, "%d\n", temperature);
> }
>
> static DEVICE_ATTR(type, 0444, type_show, NULL);
> @@ -236,8 +290,12 @@ thermal_cooling_device_max_state_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> struct thermal_cooling_device *cdev = to_cooling_device(dev);
> + int state, ret;
>
> - return cdev->ops->get_max_state(cdev, buf);
> + ret = cdev->ops->get_max_state(cdev, &state);
> + if (ret)
> + return ret;
> + return sprintf(buf, "%d\n", state);
> }
>
> static ssize_t
> @@ -245,8 +303,12 @@ thermal_cooling_device_cur_state_show(struct device *dev,
> struct device_attribute *attr, char *buf)
> {
> struct thermal_cooling_device *cdev = to_cooling_device(dev);
> + int state, ret;
>
> - return cdev->ops->get_cur_state(cdev, buf);
> + ret = cdev->ops->get_cur_state(cdev, &state);
> + if (ret)
> + return ret;
> + return sprintf(buf, "%d\n", state);
> }
>
> static ssize_t
> @@ -312,13 +374,20 @@ 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 +399,14 @@ 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 917707e..05e56d8 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -28,6 +28,12 @@
> #include <linux/idr.h>
> #include <linux/device.h>
>
> +enum thermal_trip_t { THERMAL_TRIP_CRITICAL, THERMAL_TRIP_HOT,
> + THERMAL_TRIP_PASSIVE, THERMAL_TRIP_ACTIVE
> +};
> +
> +enum thermal_mode_t { THERMAL_MODE_KERNEL, THERMAL_MODE_USER };
> +
> struct thermal_zone_device;
> struct thermal_cooling_device;
>
> @@ -36,17 +42,19 @@ 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_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_crit_temp) (struct thermal_zone_device *, unsigned long *);
> + int (*get_temp) (struct thermal_zone_device *, int *);
> + int (*get_mode) (struct thermal_zone_device *, enum thermal_mode_t *);
> + int (*set_mode) (struct thermal_zone_device *, enum thermal_mode_t);
> + int (*get_trip_type) (struct thermal_zone_device *, int,
> + enum thermal_trip_t *);
> + int (*get_trip_temp) (struct thermal_zone_device *, int,
> + int *);
> + int (*get_crit_temp) (struct thermal_zone_device *, int *);
> };
>
> struct thermal_cooling_device_ops {
> - int (*get_max_state) (struct thermal_cooling_device *, char *);
> - int (*get_cur_state) (struct thermal_cooling_device *, char *);
> + int (*get_max_state) (struct thermal_cooling_device *, unsigned int *);
> + int (*get_cur_state) (struct thermal_cooling_device *, unsigned int *);
> int (*set_cur_state) (struct thermal_cooling_device *, unsigned int);
> };
>
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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