Per ACPI 6.2 spec, platforms can optionally add a string(_STR)
object within each thermal zone package which provides a user
friendly name/description.
Add support to parse the string object, which will be exposed
to userspace by thermal framework.
Signed-off-by: Prashanth Prakash <pprakash@xxxxxxxxxxxxxx>
---
drivers/acpi/thermal.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 1d0417b..6ab6480 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -41,6 +41,7 @@
#include <linux/acpi.h>
#include <linux/workqueue.h>
#include <linux/uaccess.h>
+#include <linux/nls.h>
#define PREFIX "ACPI: "
@@ -188,6 +189,7 @@ struct acpi_thermal {
int tz_enabled;
int kelvin_offset;
struct work_struct thermal_check_work;
+ char desc[THERMAL_MAX_DESC_STR_LEN];
};
/* --------------------------------------------------------------------------
@@ -543,6 +545,15 @@ static int thermal_get_temp(struct thermal_zone_device *thermal, int *temp)
return 0;
}
+static int thermal_get_desc(struct thermal_zone_device *thermal, char *desc,
+ int size)
+{
+ struct acpi_thermal *tz = thermal->devdata;
+
+ strlcpy(desc, tz->desc, size);
+ return 0;
+}
+
static int thermal_get_mode(struct thermal_zone_device *thermal,
enum thermal_device_mode *mode)
{
@@ -880,6 +891,7 @@ static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
.get_crit_temp = thermal_get_crit_temp,
.get_trend = thermal_get_trend,
.notify = thermal_notify,
+ .get_desc = thermal_get_desc,
};
static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
@@ -1014,6 +1026,29 @@ static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
acpi_evaluate_integer(handle, "_TMP", NULL, &value);
}
+static void acpi_thermal_get_desc(struct acpi_thermal *tz)
+{
+ acpi_handle handle = tz->device->handle;
+ acpi_status status;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+
+ status = acpi_evaluate_object(handle, "_STR", NULL, &buffer);
+
+ if (ACPI_FAILURE(status))
+ strlcpy(tz->desc, "<not supported>", THERMAL_MAX_DESC_STR_LEN);
+ else {
+ union acpi_object *str;
+ int result;
+
+ str = buffer.pointer;
+ result = utf16s_to_utf8s((wchar_t *)str->string.pointer,
+ str->string.length, UTF16_LITTLE_ENDIAN,
+ tz->desc, THERMAL_MAX_DESC_STR_LEN-1);
+ tz->desc[result] = 0;
+ kfree(buffer.pointer);
+ }
+}
+
static int acpi_thermal_get_info(struct acpi_thermal *tz)
{
int result = 0;
@@ -1045,6 +1080,9 @@ static int acpi_thermal_get_info(struct acpi_thermal *tz)
else
acpi_thermal_get_polling_frequency(tz);
+ /* Get thermal zone description [_STR] (optional) */
+ acpi_thermal_get_desc(tz);
+
return 0;
}
--
Qualcomm Datacenter Technologies on behalf of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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