Hi Rui,
Sorry for sending one incomplete mail before.
I like this approach of multiple cooling states for ACTIVE type cooling devices.
Some comments added.
On 11 June 2012 08:50, Zhang Rui <rui.zhang@xxxxxxxxx> wrote:
>
> Set upper and lower limits when binding
> a thermal cooling device to a thermal zone device.
>
> Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
> ---
> drivers/acpi/thermal.c | 34 ++++++++++++++++++++++++----------
> drivers/platform/x86/acerhdf.c | 2 +-
> drivers/thermal/thermal_sys.c | 20 ++++++++++++++------
> include/linux/thermal.h | 3 ++-
> 4 files changed, 41 insertions(+), 18 deletions(-)
>
> Index: rtd3/drivers/thermal/thermal_sys.c
> ===================================================================
> --- rtd3.orig/drivers/thermal/thermal_sys.c
> +++ rtd3/drivers/thermal/thermal_sys.c
> @@ -248,7 +248,7 @@ passive_store(struct device *dev, struct
> sizeof("Processor")))
> thermal_zone_bind_cooling_device(tz,
> THERMAL_TRIPS_NONE,
> - cdev);
> + cdev, -1, -1);
> }
> mutex_unlock(&thermal_list_lock);
> if (!tz->passive_delay)
> @@ -760,7 +760,8 @@ static void thermal_zone_device_check(st
> */
> int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
> int trip,
> - struct thermal_cooling_device *cdev)
> + struct thermal_cooling_device *cdev,
> + long upper, long lower)
> {
> struct thermal_cooling_device_instance *dev;
> struct thermal_cooling_device_instance *pos;
> @@ -784,6 +785,15 @@ int thermal_zone_bind_cooling_device(str
> if (tz != pos1 || cdev != pos2)
> return -EINVAL;
>
> + cdev->ops->get_max_state(cdev, &max_state);
> +
> + /* lower default 0, upper default max_state */
> + lower = lower < 0 ? 0 : lower;
> + upper = upper < 0 ? max_state : upper;
> +
> + if (lower > upper || upper > max_state)
> + return -EINVAL;
> +
> dev =
> kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
> if (!dev)
> @@ -791,10 +801,8 @@ int thermal_zone_bind_cooling_device(str
> dev->tz = tz;
> dev->cdev = cdev;
> dev->trip = trip;
> -
> - cdev->ops->get_max_state(dev, &max_state);
> - dev->upper = max_state;
> - dev->lower = 0;
> + dev->upper = upper;
> + dev->lower = lower;
Also some check can be added here like this,
cdev->ops->get_max_state(cdev, &cur_state);
if (cur_state != lower) {
print_err("Set the initial state of the cooling device
to lower\n");
return -EINVAL;
}
This is needed because in your thermal_zone_update
implementation the state change is from lower - upper.
>
> result = get_idr(&tz->idr, &tz->lock, &dev->id);
> if (result)
> Index: rtd3/include/linux/thermal.h
> ===================================================================
> --- rtd3.orig/include/linux/thermal.h
> +++ rtd3/include/linux/thermal.h
> @@ -143,7 +143,8 @@ struct thermal_zone_device *thermal_zone
> void thermal_zone_device_unregister(struct thermal_zone_device *);
>
> int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
> - struct thermal_cooling_device *);
> + struct thermal_cooling_device *,
> + long, long);
> int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
> struct thermal_cooling_device *);
> void thermal_zone_device_update(struct thermal_zone_device *);
> Index: rtd3/drivers/acpi/thermal.c
> ===================================================================
> --- rtd3.orig/drivers/acpi/thermal.c
> +++ rtd3/drivers/acpi/thermal.c
> @@ -729,11 +729,9 @@ static int thermal_notify(struct thermal
> return 0;
> }
>
> -typedef int (*cb)(struct thermal_zone_device *, int,
> - struct thermal_cooling_device *);
> static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
> struct thermal_cooling_device *cdev,
> - cb action)
> + int bind)
> {
> struct acpi_device *device = cdev->devdata;
> struct acpi_thermal *tz = thermal->devdata;
> @@ -758,7 +756,14 @@ static int acpi_thermal_cooling_device_c
> handle = tz->trips.passive.devices.handles[i];
> status = acpi_bus_get_device(handle, &dev);
> if (ACPI_SUCCESS(status) && (dev == device)) {
> - result = action(thermal, trip, cdev);
> + if (bind)
> + result =
> + thermal_zone_bind_cooling_device(
> + thermal, trip, cdev, -1, -1);
> + else
> + result =
> + thermal_zone_unbind_cooling_device(
> + thermal, trip, cdev);
> if (result)
> goto failed;
> }
> @@ -775,7 +780,13 @@ static int acpi_thermal_cooling_device_c
> handle = tz->trips.active[i].devices.handles[j];
> status = acpi_bus_get_device(handle, &dev);
> if (ACPI_SUCCESS(status) && (dev == device)) {
> - result = action(thermal, trip, cdev);
> + if (bind)
> + result =
> + thermal_zone_bind_cooling_device(
> + thermal, trip, cdev, -1, -1);
> + else
> + result = thermal_zone_unbind_cooling_device(
> + thermal, trip, cdev);
> if (result)
> goto failed;
> }
> @@ -786,7 +797,12 @@ static int acpi_thermal_cooling_device_c
> handle = tz->devices.handles[i];
> status = acpi_bus_get_device(handle, &dev);
> if (ACPI_SUCCESS(status) && (dev == device)) {
> - result = action(thermal, -1, cdev);
> + if (bind)
> + result = thermal_zone_bind_cooling_device(thermal,
> + -1, cdev, -1, -1);
> + else
> + result = thermal_zone_unbind_cooling_device(thermal,
> + -1, cdev);
> if (result)
> goto failed;
> }
> @@ -800,16 +816,14 @@ static int
> acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
> struct thermal_cooling_device *cdev)
> {
> - return acpi_thermal_cooling_device_cb(thermal, cdev,
> - thermal_zone_bind_cooling_device);
> + return acpi_thermal_cooling_device_cb(thermal, cdev, 1);
> }
>
> static int
> acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
> struct thermal_cooling_device *cdev)
> {
> - return acpi_thermal_cooling_device_cb(thermal, cdev,
> - thermal_zone_unbind_cooling_device);
> + return acpi_thermal_cooling_device_cb(thermal, cdev, 0);
> }
>
> static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
> Index: rtd3/drivers/platform/x86/acerhdf.c
> ===================================================================
> --- rtd3.orig/drivers/platform/x86/acerhdf.c
> +++ rtd3/drivers/platform/x86/acerhdf.c
> @@ -329,7 +329,7 @@ static int acerhdf_bind(struct thermal_z
> if (cdev != cl_dev)
> return 0;
>
> - if (thermal_zone_bind_cooling_device(thermal, 0, cdev)) {
> + if (thermal_zone_bind_cooling_device(thermal, 0, cdev, -1, -1)) {
> pr_err("error binding cooling dev\n");
> return -EINVAL;
> }
>
>
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