From c56f5c0342dfee11a1a13d2f5bb7618de5b17590 Mon Sep 17 00:00:00 2001 From: Durgadoss R Date: Wed, 25 Jul 2012 10:10:58 +0800 Subject: Thermal: Make Thermal trip points writeable Some of the thermal drivers using the Generic Thermal Framework require (all/some) trip points to be writeable. This patch makes the trip point temperatures writeable on a per-trip point basis, and modifies the required function call in thermal.c. This patch also updates the Documentation to reflect the new change. Signed-off-by: Durgadoss R Signed-off-by: Zhang Rui Signed-off-by: Len Brown --- drivers/thermal/thermal_sys.c | 145 +++++++++++++++++++++++++++++------------- 1 file changed, 101 insertions(+), 44 deletions(-) (limited to 'drivers/thermal/thermal_sys.c') diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 022bacb71a7..5feb3353213 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -195,6 +195,28 @@ trip_point_type_show(struct device *dev, struct device_attribute *attr, } } +static ssize_t +trip_point_temp_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct thermal_zone_device *tz = to_thermal_zone(dev); + int trip, ret; + unsigned long temperature; + + if (!tz->ops->set_trip_temp) + return -EPERM; + + if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip)) + return -EINVAL; + + if (kstrtoul(buf, 10, &temperature)) + return -EINVAL; + + ret = tz->ops->set_trip_temp(tz, trip, temperature); + + return ret ? ret : count; +} + static ssize_t trip_point_temp_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -283,33 +305,6 @@ static DEVICE_ATTR(temp, 0444, temp_show, NULL); static DEVICE_ATTR(mode, 0644, mode_show, mode_store); static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store); -static struct device_attribute trip_point_attrs[] = { - __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL), - __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL), - __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL), -}; - /* sys I/F for cooling device */ #define to_cooling_device(_dev) \ container_of(_dev, struct thermal_cooling_device, device) @@ -1088,10 +1083,82 @@ leave: } EXPORT_SYMBOL(thermal_zone_device_update); +/** + * create_trip_attrs - create attributes for trip points + * @tz: the thermal zone device + * @mask: Writeable trip point bitmap. + */ +static int create_trip_attrs(struct thermal_zone_device *tz, int mask) +{ + int indx; + + tz->trip_type_attrs = + kzalloc(sizeof(struct thermal_attr) * tz->trips, GFP_KERNEL); + if (!tz->trip_type_attrs) + return -ENOMEM; + + tz->trip_temp_attrs = + kzalloc(sizeof(struct thermal_attr) * tz->trips, GFP_KERNEL); + if (!tz->trip_temp_attrs) { + kfree(tz->trip_type_attrs); + return -ENOMEM; + } + + for (indx = 0; indx < tz->trips; indx++) { + + /* create trip type attribute */ + snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH, + "trip_point_%d_type", indx); + + sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr); + tz->trip_type_attrs[indx].attr.attr.name = + tz->trip_type_attrs[indx].name; + tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO; + tz->trip_type_attrs[indx].attr.show = trip_point_type_show; + + device_create_file(&tz->device, + &tz->trip_type_attrs[indx].attr); + + /* create trip temp attribute */ + snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH, + "trip_point_%d_temp", indx); + + sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr); + tz->trip_temp_attrs[indx].attr.attr.name = + tz->trip_temp_attrs[indx].name; + tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO; + tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show; + if (mask & (1 << indx)) { + tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR; + tz->trip_temp_attrs[indx].attr.store = + trip_point_temp_store; + } + + device_create_file(&tz->device, + &tz->trip_temp_attrs[indx].attr); + } + return 0; +} + +static void remove_trip_attrs(struct thermal_zone_device *tz) +{ + int indx; + + for (indx = 0; indx < tz->trips; indx++) { + device_remove_file(&tz->device, + &tz->trip_type_attrs[indx].attr); + device_remove_file(&tz->device, + &tz->trip_temp_attrs[indx].attr); + } + kfree(tz->trip_type_attrs); + kfree(tz->trip_temp_attrs); +} + /** * thermal_zone_device_register - register a new thermal zone device * @type: the thermal zone device type * @trips: the number of trip points the thermal zone support + * @mask: a bit string indicating the writeablility of trip points * @devdata: private device data * @ops: standard thermal zone device callbacks * @tc1: thermal coefficient 1 for passive calculations @@ -1107,7 +1174,7 @@ EXPORT_SYMBOL(thermal_zone_device_update); * section 11.1.5.1 of the ACPI specification 3.0. */ struct thermal_zone_device *thermal_zone_device_register(char *type, - int trips, void *devdata, + int trips, int mask, void *devdata, const struct thermal_zone_device_ops *ops, int tc1, int tc2, int passive_delay, int polling_delay) { @@ -1121,7 +1188,7 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, if (strlen(type) >= THERMAL_NAME_LENGTH) return ERR_PTR(-EINVAL); - if (trips > THERMAL_MAX_TRIPS || trips < 0) + if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) return ERR_PTR(-EINVAL); if (!ops || !ops->get_temp) @@ -1175,15 +1242,11 @@ struct thermal_zone_device *thermal_zone_device_register(char *type, goto unregister; } + result = create_trip_attrs(tz, mask); + if (result) + goto unregister; + for (count = 0; count < trips; count++) { - result = device_create_file(&tz->device, - &trip_point_attrs[count * 2]); - if (result) - break; - result = device_create_file(&tz->device, - &trip_point_attrs[count * 2 + 1]); - if (result) - goto unregister; tz->ops->get_trip_type(tz, count, &trip_type); if (trip_type == THERMAL_TRIP_PASSIVE) passive = 1; @@ -1232,7 +1295,6 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) { struct thermal_cooling_device *cdev; struct thermal_zone_device *pos = NULL; - int count; if (!tz) return; @@ -1259,13 +1321,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz) device_remove_file(&tz->device, &dev_attr_temp); if (tz->ops->get_mode) device_remove_file(&tz->device, &dev_attr_mode); + remove_trip_attrs(tz); - for (count = 0; count < tz->trips; count++) { - device_remove_file(&tz->device, - &trip_point_attrs[count * 2]); - device_remove_file(&tz->device, - &trip_point_attrs[count * 2 + 1]); - } thermal_remove_hwmon_sysfs(tz); release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); idr_destroy(&tz->idr); -- cgit v1.2.3-18-g5258