1 /*
2 * INT3400 thermal driver
3 *
4 * Copyright (C) 2014, Intel Corporation
5 * Authors: Zhang Rui <rui.zhang@intel.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/acpi.h>
16 #include <linux/thermal.h>
17 #include "acpi_thermal_rel.h"
18
19 #define INT3400_THERMAL_TABLE_CHANGED 0x83
20
21 enum int3400_thermal_uuid {
22 INT3400_THERMAL_PASSIVE_1,
23 INT3400_THERMAL_ACTIVE,
24 INT3400_THERMAL_CRITICAL,
25 INT3400_THERMAL_ADAPTIVE_PERFORMANCE,
26 INT3400_THERMAL_EMERGENCY_CALL_MODE,
27 INT3400_THERMAL_PASSIVE_2,
28 INT3400_THERMAL_POWER_BOSS,
29 INT3400_THERMAL_VIRTUAL_SENSOR,
30 INT3400_THERMAL_COOLING_MODE,
31 INT3400_THERMAL_HARDWARE_DUTY_CYCLING,
32 INT3400_THERMAL_MAXIMUM_UUID,
33 };
34
35 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
36 "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
37 "3A95C389-E4B8-4629-A526-C52C88626BAE",
38 "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
39 "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D",
40 "5349962F-71E6-431D-9AE8-0A635B710AEE",
41 "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
42 "F5A35014-C209-46A4-993A-EB56DE7530A1",
43 "6ED722A7-9240-48A5-B479-31EEF723D7CF",
44 "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531",
45 "BE84BABF-C4D4-403D-B495-3128FD44dAC1",
46 };
47
48 struct int3400_thermal_priv {
49 struct acpi_device *adev;
50 struct thermal_zone_device *thermal;
51 int mode;
52 int art_count;
53 struct art *arts;
54 int trt_count;
55 struct trt *trts;
56 u8 uuid_bitmap;
57 int rel_misc_dev_res;
58 int current_uuid_index;
59 };
60
available_uuids_show(struct device * dev,struct device_attribute * attr,char * buf)61 static ssize_t available_uuids_show(struct device *dev,
62 struct device_attribute *attr,
63 char *buf)
64 {
65 struct platform_device *pdev = to_platform_device(dev);
66 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
67 int i;
68 int length = 0;
69
70 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
71 if (priv->uuid_bitmap & (1 << i))
72 if (PAGE_SIZE - length > 0)
73 length += snprintf(&buf[length],
74 PAGE_SIZE - length,
75 "%s\n",
76 int3400_thermal_uuids[i]);
77 }
78
79 return length;
80 }
81
current_uuid_show(struct device * dev,struct device_attribute * devattr,char * buf)82 static ssize_t current_uuid_show(struct device *dev,
83 struct device_attribute *devattr, char *buf)
84 {
85 struct platform_device *pdev = to_platform_device(dev);
86 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
87
88 if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
89 return sprintf(buf, "%s\n",
90 int3400_thermal_uuids[priv->current_uuid_index]);
91 else
92 return sprintf(buf, "INVALID\n");
93 }
94
current_uuid_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)95 static ssize_t current_uuid_store(struct device *dev,
96 struct device_attribute *attr,
97 const char *buf, size_t count)
98 {
99 struct platform_device *pdev = to_platform_device(dev);
100 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
101 int i;
102
103 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
104 if ((priv->uuid_bitmap & (1 << i)) &&
105 !(strncmp(buf, int3400_thermal_uuids[i],
106 sizeof(int3400_thermal_uuids[i]) - 1))) {
107 priv->current_uuid_index = i;
108 return count;
109 }
110 }
111
112 return -EINVAL;
113 }
114
115 static DEVICE_ATTR_RW(current_uuid);
116 static DEVICE_ATTR_RO(available_uuids);
117 static struct attribute *uuid_attrs[] = {
118 &dev_attr_available_uuids.attr,
119 &dev_attr_current_uuid.attr,
120 NULL
121 };
122
123 static const struct attribute_group uuid_attribute_group = {
124 .attrs = uuid_attrs,
125 .name = "uuids"
126 };
127
int3400_thermal_get_uuids(struct int3400_thermal_priv * priv)128 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
129 {
130 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
131 union acpi_object *obja, *objb;
132 int i, j;
133 int result = 0;
134 acpi_status status;
135
136 status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
137 if (ACPI_FAILURE(status))
138 return -ENODEV;
139
140 obja = (union acpi_object *)buf.pointer;
141 if (obja->type != ACPI_TYPE_PACKAGE) {
142 result = -EINVAL;
143 goto end;
144 }
145
146 for (i = 0; i < obja->package.count; i++) {
147 objb = &obja->package.elements[i];
148 if (objb->type != ACPI_TYPE_BUFFER) {
149 result = -EINVAL;
150 goto end;
151 }
152
153 /* UUID must be 16 bytes */
154 if (objb->buffer.length != 16) {
155 result = -EINVAL;
156 goto end;
157 }
158
159 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
160 guid_t guid;
161
162 guid_parse(int3400_thermal_uuids[j], &guid);
163 if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
164 priv->uuid_bitmap |= (1 << j);
165 break;
166 }
167 }
168 }
169
170 end:
171 kfree(buf.pointer);
172 return result;
173 }
174
int3400_thermal_run_osc(acpi_handle handle,enum int3400_thermal_uuid uuid,bool enable)175 static int int3400_thermal_run_osc(acpi_handle handle,
176 enum int3400_thermal_uuid uuid, bool enable)
177 {
178 u32 ret, buf[2];
179 acpi_status status;
180 int result = 0;
181 struct acpi_osc_context context = {
182 .uuid_str = int3400_thermal_uuids[uuid],
183 .rev = 1,
184 .cap.length = 8,
185 };
186
187 buf[OSC_QUERY_DWORD] = 0;
188 buf[OSC_SUPPORT_DWORD] = enable;
189
190 context.cap.pointer = buf;
191
192 status = acpi_run_osc(handle, &context);
193 if (ACPI_SUCCESS(status)) {
194 ret = *((u32 *)(context.ret.pointer + 4));
195 if (ret != enable)
196 result = -EPERM;
197 } else
198 result = -EPERM;
199
200 kfree(context.ret.pointer);
201 return result;
202 }
203
int3400_notify(acpi_handle handle,u32 event,void * data)204 static void int3400_notify(acpi_handle handle,
205 u32 event,
206 void *data)
207 {
208 struct int3400_thermal_priv *priv = data;
209 char *thermal_prop[5];
210
211 if (!priv)
212 return;
213
214 switch (event) {
215 case INT3400_THERMAL_TABLE_CHANGED:
216 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
217 priv->thermal->type);
218 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
219 priv->thermal->temperature);
220 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
221 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
222 THERMAL_TABLE_CHANGED);
223 thermal_prop[4] = NULL;
224 kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
225 thermal_prop);
226 break;
227 default:
228 dev_err(&priv->adev->dev, "Unsupported event [0x%x]\n", event);
229 break;
230 }
231 }
232
int3400_thermal_get_temp(struct thermal_zone_device * thermal,int * temp)233 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
234 int *temp)
235 {
236 *temp = 20 * 1000; /* faked temp sensor with 20C */
237 return 0;
238 }
239
int3400_thermal_get_mode(struct thermal_zone_device * thermal,enum thermal_device_mode * mode)240 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
241 enum thermal_device_mode *mode)
242 {
243 struct int3400_thermal_priv *priv = thermal->devdata;
244
245 if (!priv)
246 return -EINVAL;
247
248 *mode = priv->mode;
249
250 return 0;
251 }
252
int3400_thermal_set_mode(struct thermal_zone_device * thermal,enum thermal_device_mode mode)253 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
254 enum thermal_device_mode mode)
255 {
256 struct int3400_thermal_priv *priv = thermal->devdata;
257 bool enable;
258 int result = 0;
259
260 if (!priv)
261 return -EINVAL;
262
263 if (mode == THERMAL_DEVICE_ENABLED)
264 enable = true;
265 else if (mode == THERMAL_DEVICE_DISABLED)
266 enable = false;
267 else
268 return -EINVAL;
269
270 if (enable != priv->mode) {
271 priv->mode = enable;
272 result = int3400_thermal_run_osc(priv->adev->handle,
273 priv->current_uuid_index,
274 enable);
275 }
276 return result;
277 }
278
279 static struct thermal_zone_device_ops int3400_thermal_ops = {
280 .get_temp = int3400_thermal_get_temp,
281 };
282
283 static struct thermal_zone_params int3400_thermal_params = {
284 .governor_name = "user_space",
285 .no_hwmon = true,
286 };
287
int3400_thermal_probe(struct platform_device * pdev)288 static int int3400_thermal_probe(struct platform_device *pdev)
289 {
290 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
291 struct int3400_thermal_priv *priv;
292 int result;
293
294 if (!adev)
295 return -ENODEV;
296
297 priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
298 if (!priv)
299 return -ENOMEM;
300
301 priv->adev = adev;
302
303 result = int3400_thermal_get_uuids(priv);
304 if (result)
305 goto free_priv;
306
307 result = acpi_parse_art(priv->adev->handle, &priv->art_count,
308 &priv->arts, true);
309 if (result)
310 dev_dbg(&pdev->dev, "_ART table parsing error\n");
311
312 result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
313 &priv->trts, true);
314 if (result)
315 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
316
317 platform_set_drvdata(pdev, priv);
318
319 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
320 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
321
322 priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
323 priv, &int3400_thermal_ops,
324 &int3400_thermal_params, 0, 0);
325 if (IS_ERR(priv->thermal)) {
326 result = PTR_ERR(priv->thermal);
327 goto free_art_trt;
328 }
329
330 priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
331 priv->adev->handle);
332
333 result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
334 if (result)
335 goto free_rel_misc;
336
337 result = acpi_install_notify_handler(
338 priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
339 (void *)priv);
340 if (result)
341 goto free_sysfs;
342
343 return 0;
344
345 free_sysfs:
346 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
347 free_rel_misc:
348 if (!priv->rel_misc_dev_res)
349 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
350 thermal_zone_device_unregister(priv->thermal);
351 free_art_trt:
352 kfree(priv->trts);
353 kfree(priv->arts);
354 free_priv:
355 kfree(priv);
356 return result;
357 }
358
int3400_thermal_remove(struct platform_device * pdev)359 static int int3400_thermal_remove(struct platform_device *pdev)
360 {
361 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
362
363 acpi_remove_notify_handler(
364 priv->adev->handle, ACPI_DEVICE_NOTIFY,
365 int3400_notify);
366
367 if (!priv->rel_misc_dev_res)
368 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
369
370 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
371 thermal_zone_device_unregister(priv->thermal);
372 kfree(priv->trts);
373 kfree(priv->arts);
374 kfree(priv);
375 return 0;
376 }
377
378 static const struct acpi_device_id int3400_thermal_match[] = {
379 {"INT3400", 0},
380 {}
381 };
382
383 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
384
385 static struct platform_driver int3400_thermal_driver = {
386 .probe = int3400_thermal_probe,
387 .remove = int3400_thermal_remove,
388 .driver = {
389 .name = "int3400 thermal",
390 .acpi_match_table = ACPI_PTR(int3400_thermal_match),
391 },
392 };
393
394 module_platform_driver(int3400_thermal_driver);
395
396 MODULE_DESCRIPTION("INT3400 Thermal driver");
397 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
398 MODULE_LICENSE("GPL");
399