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Linux/drivers/thermal/int3403_thermal.c

  1 /*
  2  * ACPI INT3403 thermal driver
  3  * Copyright (c) 2013, Intel Corporation.
  4  *
  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.
  8  *
  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
 12  * more details.
 13  */
 14 
 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>
 21 
 22 #define INT3403_TYPE_SENSOR             0x03
 23 #define INT3403_PERF_CHANGED_EVENT      0x80
 24 #define INT3403_THERMAL_EVENT           0x90
 25 
 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))
 29 
 30 #define ACPI_INT3403_CLASS              "int3403"
 31 #define ACPI_INT3403_FILE_STATE         "state"
 32 
 33 struct int3403_sensor {
 34         struct thermal_zone_device *tzone;
 35         unsigned long *thresholds;
 36 };
 37 
 38 static int sys_get_curr_temp(struct thermal_zone_device *tzone,
 39                                 unsigned long *temp)
 40 {
 41         struct acpi_device *device = tzone->devdata;
 42         unsigned long long tmp;
 43         acpi_status status;
 44 
 45         status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
 46         if (ACPI_FAILURE(status))
 47                 return -EIO;
 48 
 49         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
 50 
 51         return 0;
 52 }
 53 
 54 static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
 55                 int trip, unsigned long *temp)
 56 {
 57         struct acpi_device *device = tzone->devdata;
 58         unsigned long long hyst;
 59         acpi_status status;
 60 
 61         status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
 62         if (ACPI_FAILURE(status))
 63                 return -EIO;
 64 
 65         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(hyst, KELVIN_OFFSET);
 66 
 67         return 0;
 68 }
 69 
 70 static int sys_get_trip_temp(struct thermal_zone_device *tzone,
 71                 int trip, unsigned long *temp)
 72 {
 73         struct acpi_device *device = tzone->devdata;
 74         struct int3403_sensor *obj = acpi_driver_data(device);
 75 
 76         /*
 77          * get_trip_temp is a mandatory callback but
 78          * PATx method doesn't return any value, so return
 79          * cached value, which was last set from user space.
 80          */
 81         *temp = obj->thresholds[trip];
 82 
 83         return 0;
 84 }
 85 
 86 static int sys_get_trip_type(struct thermal_zone_device *thermal,
 87                 int trip, enum thermal_trip_type *type)
 88 {
 89         /* Mandatory callback, may not mean much here */
 90         *type = THERMAL_TRIP_PASSIVE;
 91 
 92         return 0;
 93 }
 94 
 95 int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
 96                                                         unsigned long temp)
 97 {
 98         struct acpi_device *device = tzone->devdata;
 99         acpi_status status;
100         char name[10];
101         int ret = 0;
102         struct int3403_sensor *obj = acpi_driver_data(device);
103 
104         snprintf(name, sizeof(name), "PAT%d", trip);
105         if (acpi_has_method(device->handle, name)) {
106                 status = acpi_execute_simple_method(device->handle, name,
107                                 MILLI_CELSIUS_TO_DECI_KELVIN(temp,
108                                                         KELVIN_OFFSET));
109                 if (ACPI_FAILURE(status))
110                         ret = -EIO;
111                 else
112                         obj->thresholds[trip] = temp;
113         } else {
114                 ret = -EIO;
115                 dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
116         }
117 
118         return ret;
119 }
120 
121 static struct thermal_zone_device_ops tzone_ops = {
122         .get_temp = sys_get_curr_temp,
123         .get_trip_temp = sys_get_trip_temp,
124         .get_trip_type = sys_get_trip_type,
125         .set_trip_temp = sys_set_trip_temp,
126         .get_trip_hyst =  sys_get_trip_hyst,
127 };
128 
129 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
130 {
131         struct int3403_sensor *obj;
132 
133         if (!device)
134                 return;
135 
136         obj = acpi_driver_data(device);
137         if (!obj)
138                 return;
139 
140         switch (event) {
141         case INT3403_PERF_CHANGED_EVENT:
142                 break;
143         case INT3403_THERMAL_EVENT:
144                 thermal_zone_device_update(obj->tzone);
145                 break;
146         default:
147                 dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
148                 break;
149         }
150 }
151 
152 static int acpi_int3403_add(struct acpi_device *device)
153 {
154         int result = 0;
155         unsigned long long ptyp;
156         acpi_status status;
157         struct int3403_sensor *obj;
158         unsigned long long trip_cnt;
159         int trip_mask = 0;
160 
161         if (!device)
162                 return -EINVAL;
163 
164         status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
165         if (ACPI_FAILURE(status))
166                 return -EINVAL;
167 
168         if (ptyp != INT3403_TYPE_SENSOR)
169                 return -EINVAL;
170 
171         obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
172         if (!obj)
173                 return -ENOMEM;
174 
175         device->driver_data = obj;
176 
177         status = acpi_evaluate_integer(device->handle, "PATC", NULL,
178                                                 &trip_cnt);
179         if (ACPI_FAILURE(status))
180                 trip_cnt = 0;
181 
182         if (trip_cnt) {
183                 /* We have to cache, thresholds can't be readback */
184                 obj->thresholds = devm_kzalloc(&device->dev,
185                                         sizeof(*obj->thresholds) * trip_cnt,
186                                         GFP_KERNEL);
187                 if (!obj->thresholds)
188                         return -ENOMEM;
189                 trip_mask = BIT(trip_cnt) - 1;
190         }
191         obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
192                                 trip_cnt, trip_mask, device, &tzone_ops,
193                                 NULL, 0, 0);
194         if (IS_ERR(obj->tzone)) {
195                 result = PTR_ERR(obj->tzone);
196                 return result;
197         }
198 
199         strcpy(acpi_device_name(device), "INT3403");
200         strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
201 
202         return 0;
203 }
204 
205 static int acpi_int3403_remove(struct acpi_device *device)
206 {
207         struct int3403_sensor *obj;
208 
209         obj = acpi_driver_data(device);
210         thermal_zone_device_unregister(obj->tzone);
211 
212         return 0;
213 }
214 
215 ACPI_MODULE_NAME("int3403");
216 static const struct acpi_device_id int3403_device_ids[] = {
217         {"INT3403", 0},
218         {"", 0},
219 };
220 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
221 
222 static struct acpi_driver acpi_int3403_driver = {
223         .name = "INT3403",
224         .class = ACPI_INT3403_CLASS,
225         .ids = int3403_device_ids,
226         .ops = {
227                 .add = acpi_int3403_add,
228                 .remove = acpi_int3403_remove,
229                 .notify = acpi_thermal_notify,
230                 },
231 };
232 
233 module_acpi_driver(acpi_int3403_driver);
234 
235 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
236 MODULE_LICENSE("GPL v2");
237 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
238 

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