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 <durgadoss.r@xxxxxxxxx>
---
v1
* patch1/2: Code for making trip points writeable
* patch2/2: Change the callee in thermal.c
v2
* Make both the changes in a single patch
* Update Documentation/thermal/sysfs-api.txt
v3
* Re-submitting, on top of the latest mainline kernel
v4
* Added a check on the 'flag' parameter in tzd register function
v5
* Updated the tzd register call in other drivers
v6
* Fixed a invalid memory reference and removed the
unnecessary local variable in create_trip_x_attr functions.
---
Documentation/thermal/sysfs-api.txt | 4 +-
drivers/acpi/thermal.c | 4 +-
drivers/platform/x86/acerhdf.c | 2 +-
drivers/platform/x86/intel_mid_thermal.c | 2 +-
drivers/thermal/spear_thermal.c | 2 +-
drivers/thermal/thermal_sys.c | 119 ++++++++++++++++++++---------
include/linux/thermal.h | 10 ++-
7 files changed, 97 insertions(+), 46 deletions(-)
diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index 1733ab9..0c7c423 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -32,7 +32,8 @@ temperature) and throttle appropriate devices.
1.1 thermal zone device interface
1.1.1 struct thermal_zone_device *thermal_zone_device_register(char *name,
- int trips, void *devdata, struct thermal_zone_device_ops *ops)
+ int trips, int flag, void *devdata,
+ struct thermal_zone_device_ops *ops)
This interface function adds a new thermal zone device (sensor) to
/sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
@@ -40,6 +41,7 @@ temperature) and throttle appropriate devices.
name: the thermal zone name.
trips: the total number of trip points this thermal zone supports.
+ flag: Bit string: If 'n'th bit is set, then trip point 'n' is writeable.
devdata: device private data
ops: thermal zone device call-backs.
.bind: bind the thermal zone device with a thermal cooling device.
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 7dbebea..2107d1b 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -845,7 +845,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
if (tz->trips.passive.flags.valid)
tz->thermal_zone =
- thermal_zone_device_register("acpitz", trips, tz,
+ thermal_zone_device_register("acpitz", trips, 0, tz,
&acpi_thermal_zone_ops,
tz->trips.passive.tc1,
tz->trips.passive.tc2,
@@ -853,7 +853,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
tz->polling_frequency*100);
else
tz->thermal_zone =
- thermal_zone_device_register("acpitz", trips, tz,
+ thermal_zone_device_register("acpitz", trips, 0, tz,
&acpi_thermal_zone_ops,
0, 0, 0,
tz->polling_frequency*100);
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 2fd9d36..39abb15 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -660,7 +660,7 @@ static int acerhdf_register_thermal(void)
if (IS_ERR(cl_dev))
return -EINVAL;
- thz_dev = thermal_zone_device_register("acerhdf", 1, NULL,
+ thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL,
&acerhdf_dev_ops, 0, 0, 0,
(kernelmode) ? interval*1000 : 0);
if (IS_ERR(thz_dev))
diff --git a/drivers/platform/x86/intel_mid_thermal.c b/drivers/platform/x86/intel_mid_thermal.c
index 5ae9cd9..2b2c212 100644
--- a/drivers/platform/x86/intel_mid_thermal.c
+++ b/drivers/platform/x86/intel_mid_thermal.c
@@ -499,7 +499,7 @@ static int mid_thermal_probe(struct platform_device *pdev)
goto err;
}
pinfo->tzd[i] = thermal_zone_device_register(name[i],
- 0, td_info, &tzd_ops, 0, 0, 0, 0);
+ 0, 0, td_info, &tzd_ops, 0, 0, 0, 0);
if (IS_ERR(pinfo->tzd[i])) {
kfree(td_info);
ret = PTR_ERR(pinfo->tzd[i]);
diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c
index c2e32df..69a55d4 100644
--- a/drivers/thermal/spear_thermal.c
+++ b/drivers/thermal/spear_thermal.c
@@ -147,7 +147,7 @@ static int spear_thermal_probe(struct platform_device *pdev)
stdev->flags = pdata->thermal_flags;
writel_relaxed(stdev->flags, stdev->thermal_base);
- spear_thermal = thermal_zone_device_register("spear_thermal", 0,
+ spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
stdev, &ops, 0, 0, 0, 0);
if (IS_ERR(spear_thermal)) {
dev_err(&pdev->dev, "thermal zone device is NULL\n");
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 022bacb..9dfa940 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -196,6 +196,28 @@ 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)
@@ -1089,9 +1084,58 @@ leave:
EXPORT_SYMBOL(thermal_zone_device_update);
/**
+ * create_trip_type_attr - creates a trip point type attribute
+ * @tz: the thermal zone device
+ * @indx: index into the trip_type_attrs array
+ */
+static int create_trip_type_attr(struct thermal_zone_device *tz, int indx)
+{
+ char *attr_name = kzalloc(THERMAL_NAME_LENGTH, GFP_KERNEL);
+ if (!attr_name)
+ return -ENOMEM;
+
+ snprintf(attr_name, THERMAL_NAME_LENGTH, "trip_point_%d_type", indx);
+
+ sysfs_attr_init(&tz->trip_type_attrs[indx].attr);
+ tz->trip_type_attrs[indx].attr.name = attr_name;
+ tz->trip_type_attrs[indx].attr.mode = S_IRUGO;
+ tz->trip_type_attrs[indx].show = trip_point_type_show;
+
+ return device_create_file(&tz->device, &tz->trip_type_attrs[indx]);
+}
+
+/**
+ * create_trip_temp_attr - creates a trip point temp attribute
+ * @tz: the thermal zone device
+ * @indx: index into the trip_type_attrs array
+ * @writeable: A flag: If 1, 'this' trip point is writeable; otherwise not
+ */
+static int create_trip_temp_attr(struct thermal_zone_device *tz,
+ int indx, int writeable)
+{
+ char *attr_name = kzalloc(THERMAL_NAME_LENGTH, GFP_KERNEL);
+ if (!attr_name)
+ return -ENOMEM;
+
+ snprintf(attr_name, THERMAL_NAME_LENGTH, "trip_point_%d_temp", indx);
+
+ sysfs_attr_init(&tz->trip_temp_attrs[indx].attr);
+ tz->trip_temp_attrs[indx].attr.name = attr_name;
+ tz->trip_temp_attrs[indx].attr.mode = S_IRUGO;
+ tz->trip_temp_attrs[indx].show = trip_point_temp_show;
+ if (writeable) {
+ tz->trip_temp_attrs[indx].attr.mode |= S_IWUSR;
+ tz->trip_temp_attrs[indx].store = trip_point_temp_store;
+ }
+
+ return device_create_file(&tz->device, &tz->trip_temp_attrs[indx]);
+}
+
+/**
* 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
+ * @flag: 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 +1151,7 @@ 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 flag, void *devdata,
const struct thermal_zone_device_ops *ops,
int tc1, int tc2, int passive_delay, int polling_delay)
{
@@ -1124,6 +1168,9 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
if (trips > THERMAL_MAX_TRIPS || trips < 0)
return ERR_PTR(-EINVAL);
+ if (flag >> trips)
+ return ERR_PTR(-EINVAL);
+
if (!ops || !ops->get_temp)
return ERR_PTR(-EINVAL);
@@ -1176,14 +1223,14 @@ struct thermal_zone_device *thermal_zone_device_register(char *type,
}
for (count = 0; count < trips; count++) {
- result = device_create_file(&tz->device,
- &trip_point_attrs[count * 2]);
+ result = create_trip_type_attr(tz, count);
if (result)
- break;
- result = device_create_file(&tz->device,
- &trip_point_attrs[count * 2 + 1]);
+ goto unregister;
+ result = create_trip_temp_attr(tz, count,
+ !!(flag & (1 << count)));
if (result)
goto unregister;
+
tz->ops->get_trip_type(tz, count, &trip_type);
if (trip_type == THERMAL_TRIP_PASSIVE)
passive = 1;
@@ -1261,10 +1308,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
device_remove_file(&tz->device, &dev_attr_mode);
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]);
+ device_remove_file(&tz->device, &tz->trip_type_attrs[count]);
+ device_remove_file(&tz->device, &tz->trip_temp_attrs[count]);
}
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 796f1ff..825d4b0 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -58,6 +58,8 @@ struct thermal_zone_device_ops {
enum thermal_trip_type *);
int (*get_trip_temp) (struct thermal_zone_device *, int,
unsigned long *);
+ int (*set_trip_temp) (struct thermal_zone_device *, int,
+ unsigned long);
int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
int (*notify) (struct thermal_zone_device *, int,
enum thermal_trip_type);
@@ -89,6 +91,8 @@ struct thermal_zone_device {
int id;
char type[THERMAL_NAME_LENGTH];
struct device device;
+ struct device_attribute trip_temp_attrs[THERMAL_MAX_TRIPS];
+ struct device_attribute trip_type_attrs[THERMAL_MAX_TRIPS];
void *devdata;
int trips;
int tc1;
@@ -137,9 +141,9 @@ enum {
};
#define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
-struct thermal_zone_device *thermal_zone_device_register(char *, int, void *,
- const struct thermal_zone_device_ops *, int tc1, int tc2,
- int passive_freq, int polling_freq);
+struct thermal_zone_device *thermal_zone_device_register(char *, int, int,
+ void *, const struct thermal_zone_device_ops *, int tc1,
+ int tc2, int passive_freq, int polling_freq);
void thermal_zone_device_unregister(struct thermal_zone_device *);
int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
--
1.7.0.4
--
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