3 files changed, 245 insertions, 0 deletions

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index f35a1f75b15b..8928e6447380 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -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
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 584b36319d51..aa1bba92784e 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -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
index 000000000000..1301681d9a77
--- /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");