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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         /*
 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.
 70          */
 71         *temp = hyst * 100;
 72 
 73         return 0;
 74 }
 75 
 76 static int sys_get_trip_temp(struct thermal_zone_device *tzone,
 77                 int trip, unsigned long *temp)
 78 {
 79         struct acpi_device *device = tzone->devdata;
 80         struct int3403_sensor *obj = acpi_driver_data(device);
 81 
 82         /*
 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.
 86          */
 87         *temp = obj->thresholds[trip];
 88 
 89         return 0;
 90 }
 91 
 92 static int sys_get_trip_type(struct thermal_zone_device *thermal,
 93                 int trip, enum thermal_trip_type *type)
 94 {
 95         /* Mandatory callback, may not mean much here */
 96         *type = THERMAL_TRIP_PASSIVE;
 97 
 98         return 0;
 99 }
100 
101 int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
102                                                         unsigned long temp)
103 {
104         struct acpi_device *device = tzone->devdata;
105         acpi_status status;
106         char name[10];
107         int ret = 0;
108         struct int3403_sensor *obj = acpi_driver_data(device);
109 
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,
114                                                         KELVIN_OFFSET));
115                 if (ACPI_FAILURE(status))
116                         ret = -EIO;
117                 else
118                         obj->thresholds[trip] = temp;
119         } else {
120                 ret = -EIO;
121                 dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
122         }
123 
124         return ret;
125 }
126 
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,
133 };
134 
135 static void acpi_thermal_notify(struct acpi_device *device, u32 event)
136 {
137         struct int3403_sensor *obj;
138 
139         if (!device)
140                 return;
141 
142         obj = acpi_driver_data(device);
143         if (!obj)
144                 return;
145 
146         switch (event) {
147         case INT3403_PERF_CHANGED_EVENT:
148                 break;
149         case INT3403_THERMAL_EVENT:
150                 thermal_zone_device_update(obj->tzone);
151                 break;
152         default:
153                 dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
154                 break;
155         }
156 }
157 
158 static int acpi_int3403_add(struct acpi_device *device)
159 {
160         int result = 0;
161         unsigned long long ptyp;
162         acpi_status status;
163         struct int3403_sensor *obj;
164         unsigned long long trip_cnt;
165         int trip_mask = 0;
166 
167         if (!device)
168                 return -EINVAL;
169 
170         status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
171         if (ACPI_FAILURE(status))
172                 return -EINVAL;
173 
174         if (ptyp != INT3403_TYPE_SENSOR)
175                 return -EINVAL;
176 
177         obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
178         if (!obj)
179                 return -ENOMEM;
180 
181         device->driver_data = obj;
182 
183         status = acpi_evaluate_integer(device->handle, "PATC", NULL,
184                                                 &trip_cnt);
185         if (ACPI_FAILURE(status))
186                 trip_cnt = 0;
187 
188         if (trip_cnt) {
189                 /* We have to cache, thresholds can't be readback */
190                 obj->thresholds = devm_kzalloc(&device->dev,
191                                         sizeof(*obj->thresholds) * trip_cnt,
192                                         GFP_KERNEL);
193                 if (!obj->thresholds)
194                         return -ENOMEM;
195                 trip_mask = BIT(trip_cnt) - 1;
196         }
197         obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
198                                 trip_cnt, trip_mask, device, &tzone_ops,
199                                 NULL, 0, 0);
200         if (IS_ERR(obj->tzone)) {
201                 result = PTR_ERR(obj->tzone);
202                 return result;
203         }
204 
205         strcpy(acpi_device_name(device), "INT3403");
206         strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
207 
208         return 0;
209 }
210 
211 static int acpi_int3403_remove(struct acpi_device *device)
212 {
213         struct int3403_sensor *obj;
214 
215         obj = acpi_driver_data(device);
216         thermal_zone_device_unregister(obj->tzone);
217 
218         return 0;
219 }
220 
221 ACPI_MODULE_NAME("int3403");
222 static const struct acpi_device_id int3403_device_ids[] = {
223         {"INT3403", 0},
224         {"", 0},
225 };
226 MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
227 
228 static struct acpi_driver acpi_int3403_driver = {
229         .name = "INT3403",
230         .class = ACPI_INT3403_CLASS,
231         .ids = int3403_device_ids,
232         .ops = {
233                 .add = acpi_int3403_add,
234                 .remove = acpi_int3403_remove,
235                 .notify = acpi_thermal_notify,
236                 },
237 };
238 
239 module_acpi_driver(acpi_int3403_driver);
240 
241 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
242 MODULE_LICENSE("GPL v2");
243 MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
244 

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