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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         unsigned long   crit_temp;
 37         int             crit_trip_id;
 38         unsigned long   psv_temp;
 39         int             psv_trip_id;
 40 };
 41 
 42 static int sys_get_curr_temp(struct thermal_zone_device *tzone,
 43                                 unsigned long *temp)
 44 {
 45         struct acpi_device *device = tzone->devdata;
 46         unsigned long long tmp;
 47         acpi_status status;
 48 
 49         status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
 50         if (ACPI_FAILURE(status))
 51                 return -EIO;
 52 
 53         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
 54 
 55         return 0;
 56 }
 57 
 58 static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
 59                 int trip, unsigned long *temp)
 60 {
 61         struct acpi_device *device = tzone->devdata;
 62         unsigned long long hyst;
 63         acpi_status status;
 64 
 65         status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
 66         if (ACPI_FAILURE(status))
 67                 return -EIO;
 68 
 69         /*
 70          * Thermal hysteresis represents a temperature difference.
 71          * Kelvin and Celsius have same degree size. So the
 72          * conversion here between tenths of degree Kelvin unit
 73          * and Milli-Celsius unit is just to multiply 100.
 74          */
 75         *temp = hyst * 100;
 76 
 77         return 0;
 78 }
 79 
 80 static int sys_get_trip_temp(struct thermal_zone_device *tzone,
 81                 int trip, unsigned long *temp)
 82 {
 83         struct acpi_device *device = tzone->devdata;
 84         struct int3403_sensor *obj = acpi_driver_data(device);
 85 
 86         if (trip == obj->crit_trip_id)
 87                 *temp = obj->crit_temp;
 88         else if (trip == obj->psv_trip_id)
 89                 *temp = obj->psv_temp;
 90         else {
 91                 /*
 92                  * get_trip_temp is a mandatory callback but
 93                  * PATx method doesn't return any value, so return
 94                  * cached value, which was last set from user space.
 95                  */
 96                 *temp = obj->thresholds[trip];
 97         }
 98 
 99         return 0;
100 }
101 
102 static int sys_get_trip_type(struct thermal_zone_device *thermal,
103                 int trip, enum thermal_trip_type *type)
104 {
105         struct acpi_device *device = thermal->devdata;
106         struct int3403_sensor *obj = acpi_driver_data(device);
107 
108         /* Mandatory callback, may not mean much here */
109         if (trip == obj->crit_trip_id)
110                 *type = THERMAL_TRIP_CRITICAL;
111         else
112                 *type = THERMAL_TRIP_PASSIVE;
113 
114         return 0;
115 }
116 
117 int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
118                                                         unsigned long temp)
119 {
120         struct acpi_device *device = tzone->devdata;
121         acpi_status status;
122         char name[10];
123         int ret = 0;
124         struct int3403_sensor *obj = acpi_driver_data(device);
125 
126         snprintf(name, sizeof(name), "PAT%d", trip);
127         if (acpi_has_method(device->handle, name)) {
128                 status = acpi_execute_simple_method(device->handle, name,
129                                 MILLI_CELSIUS_TO_DECI_KELVIN(temp,
130                                                         KELVIN_OFFSET));
131                 if (ACPI_FAILURE(status))
132                         ret = -EIO;
133                 else
134                         obj->thresholds[trip] = temp;
135         } else {
136                 ret = -EIO;
137                 dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
138         }
139 
140         return ret;
141 }
142 
143 static struct thermal_zone_device_ops tzone_ops = {
144         .get_temp = sys_get_curr_temp,
145         .get_trip_temp = sys_get_trip_temp,
146         .get_trip_type = sys_get_trip_type,
147         .set_trip_temp = sys_set_trip_temp,
148         .get_trip_hyst =  sys_get_trip_hyst,
149 };
150 
151 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
152 {
153         struct int3403_sensor *obj;
154 
155         if (!device)
156                 return;
157 
158         obj = acpi_driver_data(device);
159         if (!obj)
160                 return;
161 
162         switch (event) {
163         case INT3403_PERF_CHANGED_EVENT:
164                 break;
165         case INT3403_THERMAL_EVENT:
166                 thermal_zone_device_update(obj->tzone);
167                 break;
168         default:
169                 dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
170                 break;
171         }
172 }
173 
174 static int sys_get_trip_crt(struct acpi_device *device, unsigned long *temp)
175 {
176         unsigned long long crt;
177         acpi_status status;
178 
179         status = acpi_evaluate_integer(device->handle, "_CRT", NULL, &crt);
180         if (ACPI_FAILURE(status))
181                 return -EIO;
182 
183         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(crt, KELVIN_OFFSET);
184 
185         return 0;
186 }
187 
188 static int sys_get_trip_psv(struct acpi_device *device, unsigned long *temp)
189 {
190         unsigned long long psv;
191         acpi_status status;
192 
193         status = acpi_evaluate_integer(device->handle, "_PSV", NULL, &psv);
194         if (ACPI_FAILURE(status))
195                 return -EIO;
196 
197         *temp = DECI_KELVIN_TO_MILLI_CELSIUS(psv, KELVIN_OFFSET);
198 
199         return 0;
200 }
201 
202 static int acpi_int3403_add(struct acpi_device *device)
203 {
204         int result = 0;
205         unsigned long long ptyp;
206         acpi_status status;
207         struct int3403_sensor *obj;
208         unsigned long long trip_cnt;
209         int trip_mask = 0;
210 
211         if (!device)
212                 return -EINVAL;
213 
214         status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
215         if (ACPI_FAILURE(status))
216                 return -EINVAL;
217 
218         if (ptyp != INT3403_TYPE_SENSOR)
219                 return -EINVAL;
220 
221         obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
222         if (!obj)
223                 return -ENOMEM;
224 
225         device->driver_data = obj;
226 
227         status = acpi_evaluate_integer(device->handle, "PATC", NULL,
228                                                 &trip_cnt);
229         if (ACPI_FAILURE(status))
230                 trip_cnt = 0;
231 
232         if (trip_cnt) {
233                 /* We have to cache, thresholds can't be readback */
234                 obj->thresholds = devm_kzalloc(&device->dev,
235                                         sizeof(*obj->thresholds) * trip_cnt,
236                                         GFP_KERNEL);
237                 if (!obj->thresholds)
238                         return -ENOMEM;
239                 trip_mask = BIT(trip_cnt) - 1;
240         }
241 
242         obj->psv_trip_id = -1;
243         if (!sys_get_trip_psv(device, &obj->psv_temp))
244                 obj->psv_trip_id = trip_cnt++;
245 
246         obj->crit_trip_id = -1;
247         if (!sys_get_trip_crt(device, &obj->crit_temp))
248                 obj->crit_trip_id = trip_cnt++;
249 
250         obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
251                                 trip_cnt, trip_mask, device, &tzone_ops,
252                                 NULL, 0, 0);
253         if (IS_ERR(obj->tzone)) {
254                 result = PTR_ERR(obj->tzone);
255                 return result;
256         }
257 
258         strcpy(acpi_device_name(device), "INT3403");
259         strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
260 
261         return 0;
262 }
263 
264 static int acpi_int3403_remove(struct acpi_device *device)
265 {
266         struct int3403_sensor *obj;
267 
268         obj = acpi_driver_data(device);
269         thermal_zone_device_unregister(obj->tzone);
270 
271         return 0;
272 }
273 
274 ACPI_MODULE_NAME("int3403");
275 static const struct acpi_device_id int3403_device_ids[] = {
276         {"INT3403", 0},
277         {"", 0},
278 };
279 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
280 
281 static struct acpi_driver acpi_int3403_driver = {
282         .name = "INT3403",
283         .class = ACPI_INT3403_CLASS,
284         .ids = int3403_device_ids,
285         .ops = {
286                 .add = acpi_int3403_add,
287                 .remove = acpi_int3403_remove,
288                 .notify = acpi_thermal_notify,
289                 },
290 };
291 
292 module_acpi_driver(acpi_int3403_driver);
293 
294 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
295 MODULE_LICENSE("GPL v2");
296 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
297 

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