Thermal: ACPI INT3403 thermal driver
The ACPI INT3403 device objects present on some systems can be used to retrieve
temperature data from thermal sensors. Add a driver registering each INT3403
device object as a thermal zone device and exposing its _TMP, PATx and GTSH
method via the standard thermal control interface under /sys/class/thermal/.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/int3403_thermal.c b/drivers/thermal/int3403_thermal.c
new file mode 100644
index 0000000..1301681
--- /dev/null
+++ b/drivers/thermal/int3403_thermal.c
@@ -0,0 +1,237 @@
+/*
+ * ACPI INT3403 thermal driver
+ * Copyright (c) 2013, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/thermal.h>
+
+#define INT3403_TYPE_SENSOR 0x03
+#define INT3403_PERF_CHANGED_EVENT 0x80
+#define INT3403_THERMAL_EVENT 0x90
+
+#define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
+#define KELVIN_OFFSET 2732
+#define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
+
+#define ACPI_INT3403_CLASS "int3403"
+#define ACPI_INT3403_FILE_STATE "state"
+
+struct int3403_sensor {
+ struct thermal_zone_device *tzone;
+ unsigned long *thresholds;
+};
+
+static int sys_get_curr_temp(struct thermal_zone_device *tzone,
+ unsigned long *temp)
+{
+ struct acpi_device *device = tzone->devdata;
+ unsigned long long tmp;
+ acpi_status status;
+
+ status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
+ if (ACPI_FAILURE(status))
+ return -EIO;
+
+ *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
+
+ return 0;
+}
+
+static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
+ int trip, unsigned long *temp)
+{
+ struct acpi_device *device = tzone->devdata;
+ unsigned long long hyst;
+ acpi_status status;
+
+ status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
+ if (ACPI_FAILURE(status))
+ return -EIO;
+
+ *temp = DECI_KELVIN_TO_MILLI_CELSIUS(hyst, KELVIN_OFFSET);
+
+ return 0;
+}
+
+static int sys_get_trip_temp(struct thermal_zone_device *tzone,
+ int trip, unsigned long *temp)
+{
+ struct acpi_device *device = tzone->devdata;
+ struct int3403_sensor *obj = acpi_driver_data(device);
+
+ /*
+ * get_trip_temp is a mandatory callback but
+ * PATx method doesn't return any value, so return
+ * cached value, which was last set from user space.
+ */
+ *temp = obj->thresholds[trip];
+
+ return 0;
+}
+
+static int sys_get_trip_type(struct thermal_zone_device *thermal,
+ int trip, enum thermal_trip_type *type)
+{
+ /* Mandatory callback, may not mean much here */
+ *type = THERMAL_TRIP_PASSIVE;
+
+ return 0;
+}
+
+int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
+ unsigned long temp)
+{
+ struct acpi_device *device = tzone->devdata;
+ acpi_status status;
+ char name[10];
+ int ret = 0;
+ struct int3403_sensor *obj = acpi_driver_data(device);
+
+ snprintf(name, sizeof(name), "PAT%d", trip);
+ if (acpi_has_method(device->handle, name)) {
+ status = acpi_execute_simple_method(device->handle, name,
+ MILLI_CELSIUS_TO_DECI_KELVIN(temp,
+ KELVIN_OFFSET));
+ if (ACPI_FAILURE(status))
+ ret = -EIO;
+ else
+ obj->thresholds[trip] = temp;
+ } else {
+ ret = -EIO;
+ dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
+ }
+
+ return ret;
+}
+
+static struct thermal_zone_device_ops tzone_ops = {
+ .get_temp = sys_get_curr_temp,
+ .get_trip_temp = sys_get_trip_temp,
+ .get_trip_type = sys_get_trip_type,
+ .set_trip_temp = sys_set_trip_temp,
+ .get_trip_hyst = sys_get_trip_hyst,
+};
+
+static void acpi_thermal_notify(struct acpi_device *device, u32 event)
+{
+ struct int3403_sensor *obj;
+
+ if (!device)
+ return;
+
+ obj = acpi_driver_data(device);
+ if (!obj)
+ return;
+
+ switch (event) {
+ case INT3403_PERF_CHANGED_EVENT:
+ break;
+ case INT3403_THERMAL_EVENT:
+ thermal_zone_device_update(obj->tzone);
+ break;
+ default:
+ dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
+ break;
+ }
+}
+
+static int acpi_int3403_add(struct acpi_device *device)
+{
+ int result = 0;
+ unsigned long long ptyp;
+ acpi_status status;
+ struct int3403_sensor *obj;
+ unsigned long long trip_cnt;
+ int trip_mask = 0;
+
+ if (!device)
+ return -EINVAL;
+
+ status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
+ if (ACPI_FAILURE(status))
+ return -EINVAL;
+
+ if (ptyp != INT3403_TYPE_SENSOR)
+ return -EINVAL;
+
+ obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
+ if (!obj)
+ return -ENOMEM;
+
+ device->driver_data = obj;
+
+ status = acpi_evaluate_integer(device->handle, "PATC", NULL,
+ &trip_cnt);
+ if (ACPI_FAILURE(status))
+ trip_cnt = 0;
+
+ if (trip_cnt) {
+ /* We have to cache, thresholds can't be readback */
+ obj->thresholds = devm_kzalloc(&device->dev,
+ sizeof(*obj->thresholds) * trip_cnt,
+ GFP_KERNEL);
+ if (!obj->thresholds)
+ return -ENOMEM;
+ trip_mask = BIT(trip_cnt) - 1;
+ }
+ obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
+ trip_cnt, trip_mask, device, &tzone_ops,
+ NULL, 0, 0);
+ if (IS_ERR(obj->tzone)) {
+ result = PTR_ERR(obj->tzone);
+ return result;
+ }
+
+ strcpy(acpi_device_name(device), "INT3403");
+ strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
+
+ return 0;
+}
+
+static int acpi_int3403_remove(struct acpi_device *device)
+{
+ struct int3403_sensor *obj;
+
+ obj = acpi_driver_data(device);
+ thermal_zone_device_unregister(obj->tzone);
+
+ return 0;
+}
+
+ACPI_MODULE_NAME("int3403");
+static const struct acpi_device_id int3403_device_ids[] = {
+ {"INT3403", 0},
+ {"", 0},
+};
+MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
+
+static struct acpi_driver acpi_int3403_driver = {
+ .name = "INT3403",
+ .class = ACPI_INT3403_CLASS,
+ .ids = int3403_device_ids,
+ .ops = {
+ .add = acpi_int3403_add,
+ .remove = acpi_int3403_remove,
+ .notify = acpi_thermal_notify,
+ },
+};
+
+module_acpi_driver(acpi_int3403_driver);
+
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ACPI INT3403 thermal driver");