Messages in this thread Patch in this message | | | From | Durgadoss R <> | Subject | [PATCH 4/9] Thermal: Add trip point sysfs nodes for sensor | Date | Mon, 7 Jan 2013 12:43:21 +0530 |
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This patch adds a trip point related sysfs nodes for each sensor under a zone in /sys/class/thermal/zoneX/. The nodes will be named, sensorX_trip_active, sensorX_trip_passive, sensorX_trip_hot, sensorX_trip_critical for active, passive, hot and critical trip points respectively for sensorX.
Signed-off-by: Durgadoss R <durgadoss.r@intel.com> --- drivers/thermal/thermal_sys.c | 211 ++++++++++++++++++++++++++++++++++++++++- include/linux/thermal.h | 38 +++++++- 2 files changed, 246 insertions(+), 3 deletions(-)
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 332bd61..1958bb8 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -450,6 +450,22 @@ static void thermal_zone_device_check(struct work_struct *work) thermal_zone_device_update(tz); } +static int get_sensor_indx_by_kobj(struct thermal_zone *tz, const char *name) +{ + int i, indx = -EINVAL; + + mutex_lock(&sensor_list_lock); + for (i = 0; i < tz->sensor_indx; i++) { + if (!strnicmp(name, kobject_name(&tz->sensors[i]->device.kobj), + THERMAL_NAME_LENGTH)) { + indx = i; + break; + } + } + mutex_unlock(&sensor_list_lock); + return indx; +} + static void remove_sensor_from_zone(struct thermal_zone *tz, struct thermal_sensor *ts) { @@ -461,9 +477,16 @@ static void remove_sensor_from_zone(struct thermal_zone *tz, sysfs_remove_link(&tz->device.kobj, kobject_name(&ts->device.kobj)); + /* Remove trip point attributes associated with this sensor */ + kfree(tz->trip_attr[indx]); + tz->trip_attr[indx] = NULL; + /* Shift the entries in the tz->sensors array */ - for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++) + for (j = indx; j < MAX_SENSORS_PER_ZONE - 1; j++) { tz->sensors[j] = tz->sensors[j + 1]; + tz->sensor_trip[j] = tz->sensor_trip[j + 1]; + tz->trip_attr[j] = tz->trip_attr[j + 1]; + } tz->sensor_indx--; } @@ -877,6 +900,99 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf) return sprintf(buf, "%s\n", tz->governor->name); } +static ssize_t +active_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + int i, indx, ret = 0; + char kobj_name[THERMAL_NAME_LENGTH]; + struct thermal_zone *tz = to_zone(dev); + + if (!sscanf(attr->attr.name, "sensor%d_trip_active", &i)) + return -EINVAL; + + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", i); + indx = get_sensor_indx_by_kobj(tz, kobj_name); + if (indx < 0) + return indx; + + if (tz->sensor_trip[indx]->num_active_trips <= 0) + return sprintf(buf, "<Not available>\n"); + + ret += sprintf(buf, "0x%x", tz->sensor_trip[indx]->active_trip_mask); + for (i = 0; i < tz->sensor_trip[indx]->num_active_trips; i++) { + ret += sprintf(buf + ret, " %d", + tz->sensor_trip[indx]->active_trips[i]); + } + + ret += sprintf(buf + ret, "\n"); + return ret; +} + +static ssize_t +ptrip_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + int i, indx, ret = 0; + char kobj_name[THERMAL_NAME_LENGTH]; + struct thermal_zone *tz = to_zone(dev); + + if (!sscanf(attr->attr.name, "sensor%d_trip_passive", &i)) + return -EINVAL; + + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", i); + indx = get_sensor_indx_by_kobj(tz, kobj_name); + if (indx < 0) + return indx; + + if (tz->sensor_trip[indx]->num_passive_trips <= 0) + return sprintf(buf, "<Not available>\n"); + + for (i = 0; i < tz->sensor_trip[indx]->num_passive_trips; i++) { + ret += sprintf(buf + ret, "%d ", + tz->sensor_trip[indx]->passive_trips[i]); + } + + ret += sprintf(buf + ret, "\n"); + return ret; +} + +static ssize_t +hot_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + int indx; + char kobj_name[THERMAL_NAME_LENGTH]; + struct thermal_zone *tz = to_zone(dev); + + if (!sscanf(attr->attr.name, "sensor%d_trip_hot", &indx)) + return -EINVAL; + + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", indx); + + indx = get_sensor_indx_by_kobj(tz, kobj_name); + if (indx < 0) + return indx; + + return sprintf(buf, "%d\n", tz->sensor_trip[indx]->hot); +} + +static ssize_t +critical_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + int indx; + char kobj_name[THERMAL_NAME_LENGTH]; + struct thermal_zone *tz = to_zone(dev); + + if (!sscanf(attr->attr.name, "sensor%d_trip_hot", &indx)) + return -EINVAL; + + snprintf(kobj_name, THERMAL_NAME_LENGTH, "sensor%d", indx); + + indx = get_sensor_indx_by_kobj(tz, kobj_name); + if (indx < 0) + return indx; + + return sprintf(buf, "%d\n", tz->sensor_trip[indx]->crit); +} + static DEVICE_ATTR(type, 0444, type_show, NULL); static DEVICE_ATTR(temp, 0444, temp_show, NULL); static DEVICE_ATTR(mode, 0644, mode_show, mode_store); @@ -887,7 +1003,8 @@ static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store); static DEVICE_ATTR(sensor_name, 0444, sensor_name_show, NULL); static DEVICE_ATTR(temp_input, 0444, sensor_temp_show, NULL); -static DEVICE_ATTR(zone_name, 0444, zone_name_show, NULL); +/* Thermal zone attributes */ +static DEVICE_ATTR(zone_name, S_IRUGO, zone_name_show, NULL); /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ @@ -1742,6 +1859,38 @@ static int enable_sensor_thresholds(struct thermal_sensor *ts, int count) return 0; } +static int create_sensor_trip_attrs(struct thermal_zone *tz, + struct thermal_trip_attr *attr, int indx) +{ + int i, ret; + static const char *const names[NUM_TRIP_TYPES] = { + "sensor%d_trip_active", + "sensor%d_trip_passive", + "sensor%d_trip_hot", + "sensor%d_trip_critical", + }; + static ssize_t (*const rd_ptr[NUM_TRIP_TYPES]) (struct device *dev, + struct device_attribute *devattr, char *buf) = { + active_show, ptrip_show, hot_show, critical_show}; + + for (i = 0; i < NUM_TRIP_TYPES; i++) { + snprintf(attr->attrs[i].name, THERMAL_NAME_LENGTH, names[i], + indx); + sysfs_attr_init(&attr->attrs[i].attr.attr); + attr->attrs[i].attr.attr.name = attr->attrs[i].name; + attr->attrs[i].attr.attr.mode = S_IRUGO; + attr->attrs[i].attr.show = rd_ptr[i]; + ret = device_create_file(&tz->device, &attr->attrs[i].attr); + if (ret) + goto exit; + } + return 0; +exit: + while (--i >= 0) + device_remove_file(&tz->device, &attr->attrs[i].attr); + return ret; +} + struct thermal_zone *create_thermal_zone(const char *name, void *devdata) { struct thermal_zone *tz; @@ -1791,6 +1940,7 @@ EXPORT_SYMBOL(create_thermal_zone); void remove_thermal_zone(struct thermal_zone *tz) { struct thermal_zone *pos, *next; + int i; bool found = false; if (!tz) @@ -1811,6 +1961,23 @@ void remove_thermal_zone(struct thermal_zone *tz) device_remove_file(&tz->device, &dev_attr_zone_name); + /* Just for ease of usage */ + i = tz->sensor_indx; + while (--i >= 0) { + /* Remove /sys/class/thermal/zoneX/sensorY */ + sysfs_remove_link(&tz->device.kobj, + kobject_name(&tz->sensors[i]->device.kobj)); + kfree(tz->trip_attr[i]); + } + + /* Release the cdevs attached to this zone */ + i = tz->cdev_indx; + while (--i >= 0) { + /* Remove /sys/class/thermal/zoneX/cooling_deviceY */ + sysfs_remove_link(&tz->device.kobj, + kobject_name(&tz->cdevs[i]->device.kobj)); + } + release_idr(&thermal_zone_idr, &thermal_idr_lock, tz->id); idr_destroy(&tz->idr); @@ -1922,6 +2089,46 @@ exit_zone: } EXPORT_SYMBOL(add_cdev_to_zone); +int add_sensor_trip_info(struct thermal_zone *tz, struct thermal_sensor *ts, + struct thermal_trip_point *trip) +{ + int ret, indx, kobj_indx; + + if (!tz || !ts || !trip) + return -EINVAL; + + if (!sscanf(kobject_name(&ts->device.kobj), "sensor%d", &kobj_indx)) + return -EINVAL; + + mutex_lock(&zone_list_lock); + + indx = GET_INDEX(tz, ts, sensor); + if (indx < 0) { + ret = -EINVAL; + goto exit; + } + + tz->trip_attr[indx] = kzalloc(sizeof(struct thermal_trip_attr), + GFP_KERNEL); + if (!tz->trip_attr[indx]) { + ret = -ENOMEM; + goto exit; + } + + ret = create_sensor_trip_attrs(tz, tz->trip_attr[indx], kobj_indx); + if (ret) { + kfree(tz->trip_attr[indx]); + goto exit; + } + + tz->sensor_trip[indx] = trip; + +exit: + mutex_unlock(&zone_list_lock); + return ret; +} +EXPORT_SYMBOL(add_sensor_trip_info); + /** * thermal_sensor_register - register a new thermal sensor * @name: name of the thermal sensor diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 12cc953..474547d 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -31,7 +31,8 @@ #define THERMAL_TRIPS_NONE -1 #define THERMAL_MAX_TRIPS 12 -#define THERMAL_NAME_LENGTH 20 +#define THERMAL_NAME_LENGTH 22 +#define NUM_TRIP_TYPES 4 /* No upper/lower limit requirement */ #define THERMAL_NO_LIMIT -1UL @@ -158,6 +159,34 @@ struct thermal_attr { char name[THERMAL_NAME_LENGTH]; }; +/* + * This structure defines the trip points for a sensor. + * The actual values for these trip points come from + * platform characterization. The thermal governors + * (either kernel or user space) may take appropriate + * actions when the sensors reach these trip points. + * See Documentation/thermal/sysfs-api2.txt for more details. + * + * As of now, For a particular sensor, we support: + * a) 1 hot trip point + * b) 1 critical trip point + * c) 'n' passive trip points + * d) 'm' active trip points + */ +struct thermal_trip_point { + int hot; + int crit; + int num_passive_trips; + int *passive_trips; + int num_active_trips; + int *active_trips; + int active_trip_mask; +}; + +struct thermal_trip_attr { + struct thermal_attr attrs[NUM_TRIP_TYPES]; +}; + struct thermal_sensor { char name[THERMAL_NAME_LENGTH]; int id; @@ -215,6 +244,10 @@ struct thermal_zone { /* cdev level information */ int cdev_indx; /* index into 'cdevs' array */ struct thermal_cooling_device *cdevs[MAX_CDEVS_PER_ZONE]; + + /* Thermal sensors trip information */ + struct thermal_trip_point *sensor_trip[MAX_SENSORS_PER_ZONE]; + struct thermal_trip_attr *trip_attr[MAX_SENSORS_PER_ZONE]; }; /* Structure that holds thermal governor information */ @@ -297,6 +330,9 @@ struct thermal_sensor *get_sensor_by_name(const char *); int add_cdev_to_zone(struct thermal_zone *, struct thermal_cooling_device *); struct thermal_cooling_device *get_cdev_by_name(const char *); +int add_sensor_trip_info(struct thermal_zone *, struct thermal_sensor *, + struct thermal_trip_point *); + #ifdef CONFIG_NET extern int thermal_generate_netlink_event(u32 orig, enum events event); #else -- 1.7.9.5
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