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Date: Thu, 12 Jun 2008 09:29:48 +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] More cleanup of the thermal API
On Thu, 2008-06-12 at 00:42 +0800, Matthew Garrett wrote:
> The state management functions in the thermal API also pass strings
> around. Change them to ints and do the conversion at the sysfs point.
just some codingstyle problems. :)
thanks,
rui
> Signed-off-by: Matthew Garrett <mjg@...hat.com>
>
> ---
>
> diff --git a/drivers/acpi/fan.c b/drivers/acpi/fan.c
> index 6cf10cb..f3db49e 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..2a3721d 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/video.c b/drivers/acpi/video.c
> index 5e5dda3..d8d7596 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 c537a5b..02abaf0 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -249,8 +249,12 @@ 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
> @@ -258,8 +262,12 @@ 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
> diff --git a/include/linux/thermal.h b/include/linux/thermal.h
> index 63e6619..5ddbd4f 100644
> --- a/include/linux/thermal.h
> +++ b/include/linux/thermal.h
> @@ -46,8 +46,8 @@ struct thermal_zone_device_ops {
> };
>
> 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);
> };
>
> --
> Matthew Garrett | mjg59@...f.ucam.org
>
>
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