On 23 February 2012 12:16, R, Durgadoss <durgadoss.r@xxxxxxxxx> wrote: > Hi Amit, > >> -----Original Message----- >> From: amit kachhap [mailto:amitdanielk@xxxxxxxxx] On Behalf Of Amit Daniel >> Kachhap >> Sent: Wednesday, February 22, 2012 3:44 PM >> To: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx >> Cc: linux-kernel@xxxxxxxxxxxxxxx; mjg59@xxxxxxxxxxxxx; linux- >> acpi@xxxxxxxxxxxxxxx; lenb@xxxxxxxxxx; linaro-dev@xxxxxxxxxxxxxxxx; >> amit.kachhap@xxxxxxxxxx; R, Durgadoss; rob.lee@xxxxxxxxxx; patches@xxxxxxxxxx >> Subject: [PATCH 1/4] thermal: Add a new trip type to use cooling device >> instance number >> >> This patch adds a new trip type THERMAL_TRIP_STATE_ACTIVE. This >> trip behaves same as THERMAL_TRIP_ACTIVE but also passes the cooling >> device instance number. This helps the cooling device registered as >> different instances to perform appropriate cooling action decision in >> the set_cur_state call back function. >> >> Also since the trip temperature's are in ascending order so some logic >> is put in place to skip the un-necessary checks. >> >> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@xxxxxxxxxx> >> --- >> Documentation/thermal/sysfs-api.txt | 4 +- >> drivers/thermal/thermal_sys.c | 45 ++++++++++++++++++++++++++++++++-- >> include/linux/thermal.h | 1 + >> 3 files changed, 45 insertions(+), 5 deletions(-) >> >> diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs- >> api.txt >> index 1733ab9..7a0c080 100644 >> --- a/Documentation/thermal/sysfs-api.txt >> +++ b/Documentation/thermal/sysfs-api.txt >> @@ -184,8 +184,8 @@ trip_point_[0-*]_temp >> >> trip_point_[0-*]_type >> Strings which indicate the type of the trip point. >> - E.g. it can be one of critical, hot, passive, active[0-*] for ACPI >> - thermal zone. >> + E.g. it can be one of critical, hot, passive, active[0-1], >> + state-active[0-*] for ACPI thermal zone. >> RO, Optional >> >> cdev[0-*] >> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c >> index 220ce7e..d4c9b20 100644 >> --- a/drivers/thermal/thermal_sys.c >> +++ b/drivers/thermal/thermal_sys.c >> @@ -192,6 +192,8 @@ trip_point_type_show(struct device *dev, struct >> device_attribute *attr, >> return sprintf(buf, "passive\n"); >> case THERMAL_TRIP_ACTIVE: >> return sprintf(buf, "active\n"); >> + case THERMAL_TRIP_STATE_ACTIVE: >> + return sprintf(buf, "state-active\n"); >> default: >> return sprintf(buf, "unknown\n"); >> } >> @@ -1034,10 +1036,10 @@ EXPORT_SYMBOL(thermal_cooling_device_unregister); >> >> void thermal_zone_device_update(struct thermal_zone_device *tz) >> { >> - int count, ret = 0; >> - long temp, trip_temp; >> + int count, ret = 0, inst_id; >> + long temp, trip_temp, max_state, last_trip_change = 0; >> enum thermal_trip_type trip_type; >> - struct thermal_cooling_device_instance *instance; >> + struct thermal_cooling_device_instance *instance, *state_instance; >> struct thermal_cooling_device *cdev; >> >> mutex_lock(&tz->lock); >> @@ -1086,6 +1088,43 @@ void thermal_zone_device_update(struct >> thermal_zone_device *tz) >> cdev->ops->set_cur_state(cdev, 0); >> } >> break; >> + case THERMAL_TRIP_STATE_ACTIVE: >> + list_for_each_entry(instance, &tz->cooling_devices, >> + node) { >> + if (instance->trip != count) >> + continue; >> + >> + if (temp <= last_trip_change) >> + continue; >> + >> + inst_id = 0; >> + /* >> + *For this instance how many instance of same >> + *cooling device occured before >> + */ >> + >> + list_for_each_entry(state_instance, >> + &tz->cooling_devices, node) { >> + if (instance->cdev == >> + state_instance->cdev) >> + inst_id++; >> + if (state_instance->trip == count) >> + break; >> + } > > Can you explain a bit more on this loop and the set_cur_state below ? > Sorry, I don't get the logic behind this.. This loop is basically finding the instance id of the same cooling device. Say we have done like this, thermal_zone_bind_cooling_device(thermal, 2, cdev); thermal_zone_bind_cooling_device(thermal, 3, cdev); thermal_zone_bind_cooling_device(thermal, 4, cdev); In above same cooling device cdev is binded to trip no 2,3 and 4 with inst_id generated as 1,2,3 respectively. so set_cur_state for those trip reached will be called as, set_cur_state(cdev, 1); set_cur_state(cdev, 2); set_cur_state(cdev, 3); Thanks, Amit D > > Thanks, > Durga > >> + >> + cdev = instance->cdev; >> + cdev->ops->get_max_state(cdev, &max_state); >> + >> + if ((temp >= trip_temp) && >> + (inst_id <= max_state)) >> + cdev->ops->set_cur_state(cdev, inst_id); >> + else if ((temp < trip_temp) && >> + (--inst_id <= max_state)) >> + cdev->ops->set_cur_state(cdev, inst_id); >> + >> + last_trip_change = trip_temp; >> + } >> + break; >> case THERMAL_TRIP_PASSIVE: >> if (temp >= trip_temp || tz->passive) >> thermal_zone_device_passive(tz, temp, >> diff --git a/include/linux/thermal.h b/include/linux/thermal.h >> index 796f1ff..8df901f 100644 >> --- a/include/linux/thermal.h >> +++ b/include/linux/thermal.h >> @@ -42,6 +42,7 @@ enum thermal_trip_type { >> THERMAL_TRIP_PASSIVE, >> THERMAL_TRIP_HOT, >> THERMAL_TRIP_CRITICAL, >> + THERMAL_TRIP_STATE_ACTIVE, >> }; >> >> struct thermal_zone_device_ops { >> -- >> 1.7.1 > _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
