#include <linux/module.h>
#include <linux/device.h>
#include <linux/err.h>
+#include <linux/slab.h>
#include <linux/kdev_t.h>
#include <linux/idr.h>
#include <linux/thermal.h>
#include <linux/spinlock.h>
#include <linux/reboot.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
MODULE_AUTHOR("Zhang Rui");
MODULE_DESCRIPTION("Generic thermal management sysfs support");
static LIST_HEAD(thermal_cdev_list);
static DEFINE_MUTEX(thermal_list_lock);
+static unsigned int thermal_event_seqnum;
+
static int get_idr(struct idr *idr, struct mutex *lock, int *id)
{
int err;
switch (type) {
case THERMAL_TRIP_CRITICAL:
- return sprintf(buf, "critical");
+ return sprintf(buf, "critical\n");
case THERMAL_TRIP_HOT:
- return sprintf(buf, "hot");
+ return sprintf(buf, "hot\n");
case THERMAL_TRIP_PASSIVE:
- return sprintf(buf, "passive");
+ return sprintf(buf, "passive\n");
case THERMAL_TRIP_ACTIVE:
- return sprintf(buf, "active");
+ return sprintf(buf, "active\n");
default:
- return sprintf(buf, "unknown");
+ return sprintf(buf, "unknown\n");
}
}
return sprintf(buf, "%ld\n", temperature);
}
+static ssize_t
+passive_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct thermal_zone_device *tz = to_thermal_zone(dev);
+ struct thermal_cooling_device *cdev = NULL;
+ int state;
+
+ if (!sscanf(buf, "%d\n", &state))
+ return -EINVAL;
+
+ /* sanity check: values below 1000 millicelcius don't make sense
+ * and can cause the system to go into a thermal heart attack
+ */
+ if (state && state < 1000)
+ return -EINVAL;
+
+ if (state && !tz->forced_passive) {
+ mutex_lock(&thermal_list_lock);
+ list_for_each_entry(cdev, &thermal_cdev_list, node) {
+ if (!strncmp("Processor", cdev->type,
+ sizeof("Processor")))
+ thermal_zone_bind_cooling_device(tz,
+ THERMAL_TRIPS_NONE,
+ cdev);
+ }
+ mutex_unlock(&thermal_list_lock);
+ if (!tz->passive_delay)
+ tz->passive_delay = 1000;
+ } else if (!state && tz->forced_passive) {
+ mutex_lock(&thermal_list_lock);
+ list_for_each_entry(cdev, &thermal_cdev_list, node) {
+ if (!strncmp("Processor", cdev->type,
+ sizeof("Processor")))
+ thermal_zone_unbind_cooling_device(tz,
+ THERMAL_TRIPS_NONE,
+ cdev);
+ }
+ mutex_unlock(&thermal_list_lock);
+ tz->passive_delay = 0;
+ }
+
+ tz->tc1 = 1;
+ tz->tc2 = 1;
+
+ tz->forced_passive = state;
+
+ thermal_zone_device_update(tz);
+
+ return count;
+}
+
+static ssize_t
+passive_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct thermal_zone_device *tz = to_thermal_zone(dev);
+
+ return sprintf(buf, "%d\n", tz->forced_passive);
+}
+
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);
+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),
if (!sscanf(buf, "%ld\n", &state))
return -EINVAL;
- if (state < 0)
+ if ((long)state < 0)
return -EINVAL;
result = cdev->ops->set_cur_state(cdev, state);
/* hwmon sys I/F */
#include <linux/hwmon.h>
+
+/* thermal zone devices with the same type share one hwmon device */
+struct thermal_hwmon_device {
+ char type[THERMAL_NAME_LENGTH];
+ struct device *device;
+ int count;
+ struct list_head tz_list;
+ struct list_head node;
+};
+
+struct thermal_hwmon_attr {
+ struct device_attribute attr;
+ char name[16];
+};
+
+/* one temperature input for each thermal zone */
+struct thermal_hwmon_temp {
+ struct list_head hwmon_node;
+ struct thermal_zone_device *tz;
+ struct thermal_hwmon_attr temp_input; /* hwmon sys attr */
+ struct thermal_hwmon_attr temp_crit; /* hwmon sys attr */
+};
+
static LIST_HEAD(thermal_hwmon_list);
static ssize_t
name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct thermal_hwmon_device *hwmon = dev->driver_data;
+ struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
return sprintf(buf, "%s\n", hwmon->type);
}
static DEVICE_ATTR(name, 0444, name_show, NULL);
int ret;
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
- struct thermal_zone_device *tz
- = container_of(hwmon_attr, struct thermal_zone_device,
+ struct thermal_hwmon_temp *temp
+ = container_of(hwmon_attr, struct thermal_hwmon_temp,
temp_input);
+ struct thermal_zone_device *tz = temp->tz;
ret = tz->ops->get_temp(tz, &temperature);
{
struct thermal_hwmon_attr *hwmon_attr
= container_of(attr, struct thermal_hwmon_attr, attr);
- struct thermal_zone_device *tz
- = container_of(hwmon_attr, struct thermal_zone_device,
+ struct thermal_hwmon_temp *temp
+ = container_of(hwmon_attr, struct thermal_hwmon_temp,
temp_crit);
+ struct thermal_zone_device *tz = temp->tz;
long temperature;
int ret;
}
-static int
-thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
+static struct thermal_hwmon_device *
+thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
{
struct thermal_hwmon_device *hwmon;
- int new_hwmon_device = 1;
- int result;
mutex_lock(&thermal_list_lock);
list_for_each_entry(hwmon, &thermal_hwmon_list, node)
if (!strcmp(hwmon->type, tz->type)) {
- new_hwmon_device = 0;
mutex_unlock(&thermal_list_lock);
- goto register_sys_interface;
+ return hwmon;
+ }
+ mutex_unlock(&thermal_list_lock);
+
+ return NULL;
+}
+
+/* Find the temperature input matching a given thermal zone */
+static struct thermal_hwmon_temp *
+thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
+ const struct thermal_zone_device *tz)
+{
+ struct thermal_hwmon_temp *temp;
+
+ mutex_lock(&thermal_list_lock);
+ list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
+ if (temp->tz == tz) {
+ mutex_unlock(&thermal_list_lock);
+ return temp;
}
mutex_unlock(&thermal_list_lock);
+ return NULL;
+}
+
+static int
+thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
+{
+ struct thermal_hwmon_device *hwmon;
+ struct thermal_hwmon_temp *temp;
+ int new_hwmon_device = 1;
+ int result;
+
+ hwmon = thermal_hwmon_lookup_by_type(tz);
+ if (hwmon) {
+ new_hwmon_device = 0;
+ goto register_sys_interface;
+ }
+
hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
if (!hwmon)
return -ENOMEM;
result = PTR_ERR(hwmon->device);
goto free_mem;
}
- hwmon->device->driver_data = hwmon;
+ dev_set_drvdata(hwmon->device, hwmon);
result = device_create_file(hwmon->device, &dev_attr_name);
if (result)
- goto unregister_hwmon_device;
+ goto free_mem;
register_sys_interface:
- tz->hwmon = hwmon;
+ temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
+ if (!temp) {
+ result = -ENOMEM;
+ goto unregister_name;
+ }
+
+ temp->tz = tz;
hwmon->count++;
- snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
+ snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
"temp%d_input", hwmon->count);
- tz->temp_input.attr.attr.name = tz->temp_input.name;
- tz->temp_input.attr.attr.mode = 0444;
- tz->temp_input.attr.show = temp_input_show;
- result = device_create_file(hwmon->device, &tz->temp_input.attr);
+ temp->temp_input.attr.attr.name = temp->temp_input.name;
+ temp->temp_input.attr.attr.mode = 0444;
+ temp->temp_input.attr.show = temp_input_show;
+ sysfs_attr_init(&temp->temp_input.attr.attr);
+ result = device_create_file(hwmon->device, &temp->temp_input.attr);
if (result)
- goto unregister_hwmon_device;
+ goto free_temp_mem;
if (tz->ops->get_crit_temp) {
unsigned long temperature;
if (!tz->ops->get_crit_temp(tz, &temperature)) {
- snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
+ snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
"temp%d_crit", hwmon->count);
- tz->temp_crit.attr.attr.name = tz->temp_crit.name;
- tz->temp_crit.attr.attr.mode = 0444;
- tz->temp_crit.attr.show = temp_crit_show;
+ temp->temp_crit.attr.attr.name = temp->temp_crit.name;
+ temp->temp_crit.attr.attr.mode = 0444;
+ temp->temp_crit.attr.show = temp_crit_show;
+ sysfs_attr_init(&temp->temp_crit.attr.attr);
result = device_create_file(hwmon->device,
- &tz->temp_crit.attr);
+ &temp->temp_crit.attr);
if (result)
- goto unregister_hwmon_device;
+ goto unregister_input;
}
}
mutex_lock(&thermal_list_lock);
if (new_hwmon_device)
list_add_tail(&hwmon->node, &thermal_hwmon_list);
- list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
+ list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
mutex_unlock(&thermal_list_lock);
return 0;
- unregister_hwmon_device:
- device_remove_file(hwmon->device, &tz->temp_crit.attr);
- device_remove_file(hwmon->device, &tz->temp_input.attr);
+ unregister_input:
+ device_remove_file(hwmon->device, &temp->temp_input.attr);
+ free_temp_mem:
+ kfree(temp);
+ unregister_name:
if (new_hwmon_device) {
device_remove_file(hwmon->device, &dev_attr_name);
hwmon_device_unregister(hwmon->device);
static void
thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
{
- struct thermal_hwmon_device *hwmon = tz->hwmon;
+ struct thermal_hwmon_device *hwmon;
+ struct thermal_hwmon_temp *temp;
+
+ hwmon = thermal_hwmon_lookup_by_type(tz);
+ if (unlikely(!hwmon)) {
+ /* Should never happen... */
+ dev_dbg(&tz->device, "hwmon device lookup failed!\n");
+ return;
+ }
+
+ temp = thermal_hwmon_lookup_temp(hwmon, tz);
+ if (unlikely(!temp)) {
+ /* Should never happen... */
+ dev_dbg(&tz->device, "temperature input lookup failed!\n");
+ return;
+ }
- tz->hwmon = NULL;
- device_remove_file(hwmon->device, &tz->temp_input.attr);
- device_remove_file(hwmon->device, &tz->temp_crit.attr);
+ device_remove_file(hwmon->device, &temp->temp_input.attr);
+ if (tz->ops->get_crit_temp)
+ device_remove_file(hwmon->device, &temp->temp_crit.attr);
mutex_lock(&thermal_list_lock);
- list_del(&tz->hwmon_node);
+ list_del(&temp->hwmon_node);
+ kfree(temp);
if (!list_empty(&hwmon->tz_list)) {
mutex_unlock(&thermal_list_lock);
return;
return;
if (delay > 1000)
- schedule_delayed_work(&(tz->poll_queue),
+ queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
round_jiffies(msecs_to_jiffies(delay)));
else
- schedule_delayed_work(&(tz->poll_queue),
+ queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
msecs_to_jiffies(delay));
}
goto release_idr;
sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
+ sysfs_attr_init(&dev->attr.attr);
dev->attr.attr.name = dev->attr_name;
dev->attr.attr.mode = 0444;
dev->attr.show = thermal_cooling_device_trip_point_show;
* @devdata: device private data.
* @ops: standard thermal cooling devices callbacks.
*/
-struct thermal_cooling_device *thermal_cooling_device_register(char *type,
- void *devdata,
- struct
- thermal_cooling_device_ops
- *ops)
+struct thermal_cooling_device *thermal_cooling_device_register(
+ char *type, void *devdata, const struct thermal_cooling_device_ops *ops)
{
struct thermal_cooling_device *cdev;
struct thermal_zone_device *pos;
mutex_lock(&tz->lock);
- tz->ops->get_temp(tz, &temp);
+ if (tz->ops->get_temp(tz, &temp)) {
+ /* get_temp failed - retry it later */
+ printk(KERN_WARNING PREFIX "failed to read out thermal zone "
+ "%d\n", tz->id);
+ goto leave;
+ }
for (count = 0; count < tz->trips; count++) {
tz->ops->get_trip_type(tz, count, &trip_type);
switch (trip_type) {
case THERMAL_TRIP_CRITICAL:
- if (temp > trip_temp) {
+ if (temp >= trip_temp) {
if (tz->ops->notify)
ret = tz->ops->notify(tz, count,
trip_type);
}
break;
case THERMAL_TRIP_HOT:
- if (temp > trip_temp)
+ if (temp >= trip_temp)
if (tz->ops->notify)
tz->ops->notify(tz, count, trip_type);
break;
cdev = instance->cdev;
- if (temp > trip_temp)
+ if (temp >= trip_temp)
cdev->ops->set_cur_state(cdev, 1);
else
cdev->ops->set_cur_state(cdev, 0);
}
break;
case THERMAL_TRIP_PASSIVE:
- if (temp > trip_temp || tz->passive)
+ if (temp >= trip_temp || tz->passive)
thermal_zone_device_passive(tz, temp,
trip_temp, count);
break;
}
}
+
+ if (tz->forced_passive)
+ thermal_zone_device_passive(tz, temp, tz->forced_passive,
+ THERMAL_TRIPS_NONE);
+
tz->last_temperature = temp;
+
+ leave:
if (tz->passive)
thermal_zone_device_set_polling(tz, tz->passive_delay);
else if (tz->polling_delay)
thermal_zone_device_set_polling(tz, tz->polling_delay);
+ else
+ thermal_zone_device_set_polling(tz, 0);
mutex_unlock(&tz->lock);
}
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, struct
- thermal_zone_device_ops
- *ops, int tc1, int
- tc2,
- int passive_delay,
- int polling_delay)
+ int trips, void *devdata,
+ const struct thermal_zone_device_ops *ops,
+ int tc1, int tc2, int passive_delay, int polling_delay)
{
struct thermal_zone_device *tz;
struct thermal_cooling_device *pos;
+ enum thermal_trip_type trip_type;
int result;
int count;
+ int passive = 0;
if (strlen(type) >= THERMAL_NAME_LENGTH)
return ERR_PTR(-EINVAL);
TRIP_POINT_ATTR_ADD(&tz->device, count, result);
if (result)
goto unregister;
+ tz->ops->get_trip_type(tz, count, &trip_type);
+ if (trip_type == THERMAL_TRIP_PASSIVE)
+ passive = 1;
}
+ if (!passive)
+ result = device_create_file(&tz->device,
+ &dev_attr_passive);
+
+ if (result)
+ goto unregister;
+
result = thermal_add_hwmon_sysfs(tz);
if (result)
goto unregister;
EXPORT_SYMBOL(thermal_zone_device_unregister);
+#ifdef CONFIG_NET
+static struct genl_family thermal_event_genl_family = {
+ .id = GENL_ID_GENERATE,
+ .name = THERMAL_GENL_FAMILY_NAME,
+ .version = THERMAL_GENL_VERSION,
+ .maxattr = THERMAL_GENL_ATTR_MAX,
+};
+
+static struct genl_multicast_group thermal_event_mcgrp = {
+ .name = THERMAL_GENL_MCAST_GROUP_NAME,
+};
+
+int thermal_generate_netlink_event(u32 orig, enum events event)
+{
+ struct sk_buff *skb;
+ struct nlattr *attr;
+ struct thermal_genl_event *thermal_event;
+ void *msg_header;
+ int size;
+ int result;
+
+ /* allocate memory */
+ size = nla_total_size(sizeof(struct thermal_genl_event)) + \
+ nla_total_size(0);
+
+ skb = genlmsg_new(size, GFP_ATOMIC);
+ if (!skb)
+ return -ENOMEM;
+
+ /* add the genetlink message header */
+ msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
+ &thermal_event_genl_family, 0,
+ THERMAL_GENL_CMD_EVENT);
+ if (!msg_header) {
+ nlmsg_free(skb);
+ return -ENOMEM;
+ }
+
+ /* fill the data */
+ attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT, \
+ sizeof(struct thermal_genl_event));
+
+ if (!attr) {
+ nlmsg_free(skb);
+ return -EINVAL;
+ }
+
+ thermal_event = nla_data(attr);
+ if (!thermal_event) {
+ nlmsg_free(skb);
+ return -EINVAL;
+ }
+
+ memset(thermal_event, 0, sizeof(struct thermal_genl_event));
+
+ thermal_event->orig = orig;
+ thermal_event->event = event;
+
+ /* send multicast genetlink message */
+ result = genlmsg_end(skb, msg_header);
+ if (result < 0) {
+ nlmsg_free(skb);
+ return result;
+ }
+
+ result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
+ if (result)
+ printk(KERN_INFO "failed to send netlink event:%d", result);
+
+ return result;
+}
+EXPORT_SYMBOL(thermal_generate_netlink_event);
+
+static int genetlink_init(void)
+{
+ int result;
+
+ result = genl_register_family(&thermal_event_genl_family);
+ if (result)
+ return result;
+
+ result = genl_register_mc_group(&thermal_event_genl_family,
+ &thermal_event_mcgrp);
+ if (result)
+ genl_unregister_family(&thermal_event_genl_family);
+ return result;
+}
+
+static void genetlink_exit(void)
+{
+ genl_unregister_family(&thermal_event_genl_family);
+}
+#else /* !CONFIG_NET */
+static inline int genetlink_init(void) { return 0; }
+static inline void genetlink_exit(void) {}
+#endif /* !CONFIG_NET */
+
static int __init thermal_init(void)
{
int result = 0;
mutex_destroy(&thermal_idr_lock);
mutex_destroy(&thermal_list_lock);
}
+ result = genetlink_init();
return result;
}
idr_destroy(&thermal_cdev_idr);
mutex_destroy(&thermal_idr_lock);
mutex_destroy(&thermal_list_lock);
+ genetlink_exit();
}
-subsys_initcall(thermal_init);
+fs_initcall(thermal_init);
module_exit(thermal_exit);
Code Review / linux-2.6.git / blobdiff