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Message-Id: <1380652688-5787-5-git-send-email-durgadoss.r@intel.com>
Date: Wed, 2 Oct 2013 00:08:03 +0530
From: Durgadoss R <durgadoss.r@...el.com>
To: rui.zhang@...el.com, eduardo.valentin@...com,
linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hongbo.zhang@...escale.com,
wni@...dia.com, Durgadoss R <durgadoss.r@...el.com>
Subject: [PATCHv4 4/9] Thermal: Add APIs to bind cdev to new zone structure
This patch creates new APIs to add/remove a
cdev to/from a zone. This patch does not change
the old cooling device implementation.
Signed-off-by: Durgadoss R <durgadoss.r@...el.com>
---
drivers/thermal/thermal_core.c | 136 ++++++++++++++++++++++++++++++++++++++++
include/linux/thermal.h | 9 +++
2 files changed, 145 insertions(+)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index a053b60..3c4ef62 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -58,6 +58,7 @@ static LIST_HEAD(thermal_governor_list);
static DEFINE_MUTEX(thermal_list_lock);
static DEFINE_MUTEX(sensor_list_lock);
static DEFINE_MUTEX(zone_list_lock);
+static DEFINE_MUTEX(cdev_list_lock);
static DEFINE_MUTEX(thermal_governor_lock);
#define for_each_thermal_sensor(pos) \
@@ -86,6 +87,9 @@ static DEFINE_MUTEX(thermal_governor_lock);
ret; \
})
+#define for_each_cdev(pos) \
+ list_for_each_entry(pos, &thermal_cdev_list, node)
+
static struct thermal_governor *__find_governor(const char *name)
{
struct thermal_governor *pos;
@@ -511,6 +515,27 @@ static void remove_sensor_from_zone(struct thermal_zone *tz,
mutex_unlock(&tz->lock);
}
+static void remove_cdev_from_zone(struct thermal_zone *tz,
+ struct thermal_cooling_device *cdev)
+{
+ int j, indx;
+
+ indx = GET_INDEX(tz, cdev, cdev);
+ if (indx < 0)
+ return;
+
+ sysfs_remove_link(&tz->device.kobj, kobject_name(&cdev->device.kobj));
+
+ mutex_lock(&tz->lock);
+
+ /* Shift the entries in the tz->cdevs array */
+ for (j = indx; j < MAX_CDEVS_PER_ZONE - 1; j++)
+ tz->cdevs[j] = tz->cdevs[j + 1];
+
+ tz->cdev_indx--;
+ mutex_unlock(&tz->lock);
+}
+
/* sys I/F for thermal zone */
#define to_thermal_zone(_dev) \
@@ -1555,6 +1580,7 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
int i;
const struct thermal_zone_params *tzp;
struct thermal_zone_device *tz;
+ struct thermal_zone *tmp_tz;
struct thermal_cooling_device *pos = NULL;
if (!cdev)
@@ -1592,6 +1618,13 @@ void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
mutex_unlock(&thermal_list_lock);
+ mutex_lock(&zone_list_lock);
+
+ for_each_thermal_zone(tmp_tz)
+ remove_cdev_from_zone(tmp_tz, cdev);
+
+ mutex_unlock(&zone_list_lock);
+
if (cdev->type[0])
device_remove_file(&cdev->device, &dev_attr_cdev_type);
device_remove_file(&cdev->device, &dev_attr_max_state);
@@ -1873,6 +1906,7 @@ void remove_thermal_zone(struct thermal_zone *tz)
{
struct thermal_zone *pos, *next;
struct thermal_sensor *ts;
+ struct thermal_cooling_device *cdev;
bool found = false;
if (!tz)
@@ -1894,6 +1928,9 @@ void remove_thermal_zone(struct thermal_zone *tz)
for_each_thermal_sensor(ts)
remove_sensor_from_zone(tz, ts);
+ for_each_cdev(cdev)
+ remove_cdev_from_zone(tz, cdev);
+
device_remove_file(&tz->device, &dev_attr_zone_name);
mutex_destroy(&tz->lock);
@@ -1909,6 +1946,47 @@ exit:
EXPORT_SYMBOL(remove_thermal_zone);
/**
+ * get_cdev_by_name() - search for a cdev and returns its reference
+ * @name: cooling device name to fetch the reference
+ *
+ * On success returns a reference to an unique cdev with
+ * the name matching that of @name, an ERR_PTR otherwise:
+ * -EINVAL for invalid paramenters
+ * -ENODEV for cdev not found
+ * -EEXIST for multiple matches
+ */
+struct thermal_cooling_device *get_cdev_by_name(const char *name)
+{
+ int found = 0;
+ struct thermal_cooling_device *pos;
+ struct thermal_cooling_device *cdev = ERR_PTR(-EINVAL);
+
+ if (!name)
+ return cdev;
+
+ mutex_lock(&cdev_list_lock);
+ for_each_cdev(pos) {
+ if (!strnicmp(pos->type, name, THERMAL_NAME_LENGTH)) {
+ found++;
+ cdev = pos;
+ }
+ }
+ mutex_unlock(&cdev_list_lock);
+
+ /*
+ * Nothing has been found; return an error code for it.
+ * Return success only when an unique cdev is found.
+ */
+ if (found == 0)
+ cdev = ERR_PTR(-ENODEV);
+ else if (found > 1)
+ cdev = ERR_PTR(-EEXIST);
+
+ return cdev;
+}
+EXPORT_SYMBOL(get_cdev_by_name);
+
+/**
* get_sensor_by_name() - search for a sensor and returns its reference
* @name: thermal sensor name to fetch the reference
*
@@ -2003,6 +2081,64 @@ exit_zone:
EXPORT_SYMBOL(add_sensor_to_zone);
/**
+ * add_cdev_to_zone - Add @cdev to thermal zone @tz
+ * @tz: Thermal zone reference
+ * @cdev: Cooling device reference
+ *
+ * Returns 0 on success, otherwise
+ * -EINVAL for invalid paramenters
+ * -EINVAL when trying to add more cdevs than MAX_CDEVS_PER_ZONE
+ * -EEXIST when trying add existing cdev again
+ */
+int add_cdev_to_zone(struct thermal_zone *tz,
+ struct thermal_cooling_device *cdev)
+{
+ int ret;
+
+ if (!tz || !cdev)
+ return -EINVAL;
+
+ mutex_lock(&zone_list_lock);
+
+ /* Ensure we are not adding the same cdev again!! */
+ ret = GET_INDEX(tz, cdev, cdev);
+ if (ret >= 0) {
+ ret = -EEXIST;
+ goto exit_zone;
+ }
+
+ /* Protect against 'cdev' being unregistered */
+ mutex_lock(&cdev_list_lock);
+
+ ret = sysfs_create_link(&tz->device.kobj, &cdev->device.kobj,
+ kobject_name(&cdev->device.kobj));
+ if (ret)
+ goto exit_cdev;
+
+ mutex_lock(&tz->lock);
+
+ if (tz->cdev_indx >= MAX_CDEVS_PER_ZONE - 1) {
+ dev_err(&tz->device, "Only %d cdevs allowed per zone\n",
+ MAX_CDEVS_PER_ZONE);
+ sysfs_remove_link(&tz->device.kobj,
+ kobject_name(&cdev->device.kobj));
+ ret = -EINVAL;
+ goto exit_indx_check;
+ }
+
+ tz->cdevs[tz->cdev_indx++] = cdev;
+
+exit_indx_check:
+ mutex_unlock(&tz->lock);
+exit_cdev:
+ mutex_unlock(&cdev_list_lock);
+exit_zone:
+ mutex_unlock(&zone_list_lock);
+ return ret;
+}
+EXPORT_SYMBOL(add_cdev_to_zone);
+
+/**
* thermal_sensor_register - register a new thermal sensor
* @name: name of the thermal sensor
* @count: Number of thresholds supported by hardware
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 2e12321..da7520c 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -60,6 +60,8 @@
#define MAX_SENSORS_PER_ZONE 5
+#define MAX_CDEVS_PER_ZONE 5
+
struct thermal_sensor;
struct thermal_zone_device;
struct thermal_cooling_device;
@@ -223,6 +225,10 @@ struct thermal_zone {
/* Sensor level information */
int sensor_indx; /* index into 'sensors' array */
struct thermal_sensor *sensors[MAX_SENSORS_PER_ZONE];
+
+ /* cdev level information */
+ int cdev_indx; /* index into 'cdevs' array */
+ struct thermal_cooling_device *cdevs[MAX_CDEVS_PER_ZONE];
};
/* Structure that holds thermal governor information */
@@ -300,6 +306,9 @@ void remove_thermal_zone(struct thermal_zone *);
int add_sensor_to_zone(struct thermal_zone *, struct thermal_sensor *);
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 *);
+
#ifdef CONFIG_NET
extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
enum events event);
--
1.7.9.5
--
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