2 * ACPI INT3403 thermal driver
3 * Copyright (c) 2013, Intel Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/types.h>
19 #include <linux/acpi.h>
20 #include <linux/thermal.h>
22 #define INT3403_TYPE_SENSOR 0x03
23 #define INT3403_PERF_CHANGED_EVENT 0x80
24 #define INT3403_THERMAL_EVENT 0x90
26 #define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
27 #define KELVIN_OFFSET 2732
28 #define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
30 #define ACPI_INT3403_CLASS "int3403"
31 #define ACPI_INT3403_FILE_STATE "state"
33 struct int3403_sensor {
34 struct thermal_zone_device *tzone;
35 unsigned long *thresholds;
38 static int sys_get_curr_temp(struct thermal_zone_device *tzone,
41 struct acpi_device *device = tzone->devdata;
42 unsigned long long tmp;
45 status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
46 if (ACPI_FAILURE(status))
49 *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
54 static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
55 int trip, unsigned long *temp)
57 struct acpi_device *device = tzone->devdata;
58 unsigned long long hyst;
61 status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
62 if (ACPI_FAILURE(status))
66 * Thermal hysteresis represents a temperature difference.
67 * Kelvin and Celsius have same degree size. So the
68 * conversion here between tenths of degree Kelvin unit
69 * and Milli-Celsius unit is just to multiply 100.
76 static int sys_get_trip_temp(struct thermal_zone_device *tzone,
77 int trip, unsigned long *temp)
79 struct acpi_device *device = tzone->devdata;
80 struct int3403_sensor *obj = acpi_driver_data(device);
83 * get_trip_temp is a mandatory callback but
84 * PATx method doesn't return any value, so return
85 * cached value, which was last set from user space.
87 *temp = obj->thresholds[trip];
92 static int sys_get_trip_type(struct thermal_zone_device *thermal,
93 int trip, enum thermal_trip_type *type)
95 /* Mandatory callback, may not mean much here */
96 *type = THERMAL_TRIP_PASSIVE;
101 int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
104 struct acpi_device *device = tzone->devdata;
108 struct int3403_sensor *obj = acpi_driver_data(device);
110 snprintf(name, sizeof(name), "PAT%d", trip);
111 if (acpi_has_method(device->handle, name)) {
112 status = acpi_execute_simple_method(device->handle, name,
113 MILLI_CELSIUS_TO_DECI_KELVIN(temp,
115 if (ACPI_FAILURE(status))
118 obj->thresholds[trip] = temp;
121 dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
127 static struct thermal_zone_device_ops tzone_ops = {
128 .get_temp = sys_get_curr_temp,
129 .get_trip_temp = sys_get_trip_temp,
130 .get_trip_type = sys_get_trip_type,
131 .set_trip_temp = sys_set_trip_temp,
132 .get_trip_hyst = sys_get_trip_hyst,
135 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
137 struct int3403_sensor *obj;
142 obj = acpi_driver_data(device);
147 case INT3403_PERF_CHANGED_EVENT:
149 case INT3403_THERMAL_EVENT:
150 thermal_zone_device_update(obj->tzone);
153 dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
158 static int acpi_int3403_add(struct acpi_device *device)
161 unsigned long long ptyp;
163 struct int3403_sensor *obj;
164 unsigned long long trip_cnt;
170 status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
171 if (ACPI_FAILURE(status))
174 if (ptyp != INT3403_TYPE_SENSOR)
177 obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
181 device->driver_data = obj;
183 status = acpi_evaluate_integer(device->handle, "PATC", NULL,
185 if (ACPI_FAILURE(status))
189 /* We have to cache, thresholds can't be readback */
190 obj->thresholds = devm_kzalloc(&device->dev,
191 sizeof(*obj->thresholds) * trip_cnt,
193 if (!obj->thresholds)
195 trip_mask = BIT(trip_cnt) - 1;
197 obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
198 trip_cnt, trip_mask, device, &tzone_ops,
200 if (IS_ERR(obj->tzone)) {
201 result = PTR_ERR(obj->tzone);
205 strcpy(acpi_device_name(device), "INT3403");
206 strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
211 static int acpi_int3403_remove(struct acpi_device *device)
213 struct int3403_sensor *obj;
215 obj = acpi_driver_data(device);
216 thermal_zone_device_unregister(obj->tzone);
221 ACPI_MODULE_NAME("int3403");
222 static const struct acpi_device_id int3403_device_ids[] = {
226 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
228 static struct acpi_driver acpi_int3403_driver = {
230 .class = ACPI_INT3403_CLASS,
231 .ids = int3403_device_ids,
233 .add = acpi_int3403_add,
234 .remove = acpi_int3403_remove,
235 .notify = acpi_thermal_notify,
239 module_acpi_driver(acpi_int3403_driver);
241 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
242 MODULE_LICENSE("GPL v2");
243 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");