Thermal: ACPI INT3403 thermal driver
authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Mon, 30 Dec 2013 20:55:06 +0000 (12:55 -0800)
committerZhang Rui <rui.zhang@intel.com>
Thu, 2 Jan 2014 01:42:12 +0000 (09:42 +0800)
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>
drivers/thermal/Kconfig
drivers/thermal/Makefile
drivers/thermal/int3403_thermal.c [new file with mode: 0644]

index f35a1f7..8928e64 100644 (file)
@@ -192,6 +192,13 @@ config X86_PKG_TEMP_THERMAL
          two trip points which can be set by user to get notifications via thermal
          notification methods.
 
+config ACPI_INT3403_THERMAL
+       tristate "ACPI INT3403 thermal driver"
+       depends on X86 && ACPI
+       help
+         This driver uses ACPI INT3403 device objects. If present, it will
+         register each INT3403 thermal sensor as a thermal zone.
+
 menu "Texas Instruments thermal drivers"
 source "drivers/thermal/ti-soc-thermal/Kconfig"
 endmenu
index 584b363..aa1bba9 100644 (file)
@@ -29,3 +29,4 @@ obj-$(CONFIG_DB8500_CPUFREQ_COOLING)  += db8500_cpufreq_cooling.o
 obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
 obj-$(CONFIG_X86_PKG_TEMP_THERMAL)     += x86_pkg_temp_thermal.o
 obj-$(CONFIG_TI_SOC_THERMAL)   += ti-soc-thermal/
+obj-$(CONFIG_ACPI_INT3403_THERMAL)     += int3403_thermal.o
diff --git a/drivers/thermal/int3403_thermal.c b/drivers/thermal/int3403_thermal.c
new file mode 100644 (file)
index 0000000..1301681
--- /dev/null
@@ -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");