1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * INT3400 thermal driver
4 *
5 * Copyright (C) 2014, Intel Corporation
6 * Authors: Zhang Rui <rui.zhang@intel.com>
7 */
8
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/acpi.h>
12 #include <linux/thermal.h>
13 #include "acpi_thermal_rel.h"
14
15 #define INT3400_THERMAL_TABLE_CHANGED 0x83
16
17 enum int3400_thermal_uuid {
18 INT3400_THERMAL_PASSIVE_1,
19 INT3400_THERMAL_ACTIVE,
20 INT3400_THERMAL_CRITICAL,
21 INT3400_THERMAL_ADAPTIVE_PERFORMANCE,
22 INT3400_THERMAL_EMERGENCY_CALL_MODE,
23 INT3400_THERMAL_PASSIVE_2,
24 INT3400_THERMAL_POWER_BOSS,
25 INT3400_THERMAL_VIRTUAL_SENSOR,
26 INT3400_THERMAL_COOLING_MODE,
27 INT3400_THERMAL_HARDWARE_DUTY_CYCLING,
28 INT3400_THERMAL_MAXIMUM_UUID,
29 };
30
31 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
32 "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
33 "3A95C389-E4B8-4629-A526-C52C88626BAE",
34 "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
35 "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D",
36 "5349962F-71E6-431D-9AE8-0A635B710AEE",
37 "9E04115A-AE87-4D1C-9500-0F3E340BFE75",
38 "F5A35014-C209-46A4-993A-EB56DE7530A1",
39 "6ED722A7-9240-48A5-B479-31EEF723D7CF",
40 "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531",
41 "BE84BABF-C4D4-403D-B495-3128FD44dAC1",
42 };
43
44 struct int3400_thermal_priv {
45 struct acpi_device *adev;
46 struct thermal_zone_device *thermal;
47 int mode;
48 int art_count;
49 struct art *arts;
50 int trt_count;
51 struct trt *trts;
52 u32 uuid_bitmap;
53 int rel_misc_dev_res;
54 int current_uuid_index;
55 };
56
available_uuids_show(struct device * dev,struct device_attribute * attr,char * buf)57 static ssize_t available_uuids_show(struct device *dev,
58 struct device_attribute *attr,
59 char *buf)
60 {
61 struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
62 int i;
63 int length = 0;
64
65 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
66 if (priv->uuid_bitmap & (1 << i))
67 if (PAGE_SIZE - length > 0)
68 length += snprintf(&buf[length],
69 PAGE_SIZE - length,
70 "%s\n",
71 int3400_thermal_uuids[i]);
72 }
73
74 return length;
75 }
76
current_uuid_show(struct device * dev,struct device_attribute * devattr,char * buf)77 static ssize_t current_uuid_show(struct device *dev,
78 struct device_attribute *devattr, char *buf)
79 {
80 struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
81
82 if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
83 return sprintf(buf, "%s\n",
84 int3400_thermal_uuids[priv->current_uuid_index]);
85 else
86 return sprintf(buf, "INVALID\n");
87 }
88
current_uuid_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)89 static ssize_t current_uuid_store(struct device *dev,
90 struct device_attribute *attr,
91 const char *buf, size_t count)
92 {
93 struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
94 int i;
95
96 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
97 if ((priv->uuid_bitmap & (1 << i)) &&
98 !(strncmp(buf, int3400_thermal_uuids[i],
99 sizeof(int3400_thermal_uuids[i]) - 1))) {
100 priv->current_uuid_index = i;
101 return count;
102 }
103 }
104
105 return -EINVAL;
106 }
107
108 static DEVICE_ATTR_RW(current_uuid);
109 static DEVICE_ATTR_RO(available_uuids);
110 static struct attribute *uuid_attrs[] = {
111 &dev_attr_available_uuids.attr,
112 &dev_attr_current_uuid.attr,
113 NULL
114 };
115
116 static const struct attribute_group uuid_attribute_group = {
117 .attrs = uuid_attrs,
118 .name = "uuids"
119 };
120
int3400_thermal_get_uuids(struct int3400_thermal_priv * priv)121 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
122 {
123 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
124 union acpi_object *obja, *objb;
125 int i, j;
126 int result = 0;
127 acpi_status status;
128
129 status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
130 if (ACPI_FAILURE(status))
131 return -ENODEV;
132
133 obja = (union acpi_object *)buf.pointer;
134 if (obja->type != ACPI_TYPE_PACKAGE) {
135 result = -EINVAL;
136 goto end;
137 }
138
139 for (i = 0; i < obja->package.count; i++) {
140 objb = &obja->package.elements[i];
141 if (objb->type != ACPI_TYPE_BUFFER) {
142 result = -EINVAL;
143 goto end;
144 }
145
146 /* UUID must be 16 bytes */
147 if (objb->buffer.length != 16) {
148 result = -EINVAL;
149 goto end;
150 }
151
152 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
153 guid_t guid;
154
155 guid_parse(int3400_thermal_uuids[j], &guid);
156 if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
157 priv->uuid_bitmap |= (1 << j);
158 break;
159 }
160 }
161 }
162
163 end:
164 kfree(buf.pointer);
165 return result;
166 }
167
int3400_thermal_run_osc(acpi_handle handle,enum int3400_thermal_uuid uuid,bool enable)168 static int int3400_thermal_run_osc(acpi_handle handle,
169 enum int3400_thermal_uuid uuid, bool enable)
170 {
171 u32 ret, buf[2];
172 acpi_status status;
173 int result = 0;
174 struct acpi_osc_context context = {
175 .uuid_str = int3400_thermal_uuids[uuid],
176 .rev = 1,
177 .cap.length = 8,
178 };
179
180 buf[OSC_QUERY_DWORD] = 0;
181 buf[OSC_SUPPORT_DWORD] = enable;
182
183 context.cap.pointer = buf;
184
185 status = acpi_run_osc(handle, &context);
186 if (ACPI_SUCCESS(status)) {
187 ret = *((u32 *)(context.ret.pointer + 4));
188 if (ret != enable)
189 result = -EPERM;
190 } else
191 result = -EPERM;
192
193 kfree(context.ret.pointer);
194 return result;
195 }
196
int3400_notify(acpi_handle handle,u32 event,void * data)197 static void int3400_notify(acpi_handle handle,
198 u32 event,
199 void *data)
200 {
201 struct int3400_thermal_priv *priv = data;
202 char *thermal_prop[5];
203
204 if (!priv)
205 return;
206
207 switch (event) {
208 case INT3400_THERMAL_TABLE_CHANGED:
209 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
210 priv->thermal->type);
211 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
212 priv->thermal->temperature);
213 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
214 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
215 THERMAL_TABLE_CHANGED);
216 thermal_prop[4] = NULL;
217 kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
218 thermal_prop);
219 kfree(thermal_prop[0]);
220 kfree(thermal_prop[1]);
221 kfree(thermal_prop[2]);
222 kfree(thermal_prop[3]);
223 break;
224 default:
225 /* Ignore unknown notification codes sent to INT3400 device */
226 break;
227 }
228 }
229
int3400_thermal_get_temp(struct thermal_zone_device * thermal,int * temp)230 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
231 int *temp)
232 {
233 *temp = 20 * 1000; /* faked temp sensor with 20C */
234 return 0;
235 }
236
int3400_thermal_get_mode(struct thermal_zone_device * thermal,enum thermal_device_mode * mode)237 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
238 enum thermal_device_mode *mode)
239 {
240 struct int3400_thermal_priv *priv = thermal->devdata;
241
242 if (!priv)
243 return -EINVAL;
244
245 *mode = priv->mode;
246
247 return 0;
248 }
249
int3400_thermal_set_mode(struct thermal_zone_device * thermal,enum thermal_device_mode mode)250 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
251 enum thermal_device_mode mode)
252 {
253 struct int3400_thermal_priv *priv = thermal->devdata;
254 bool enable;
255 int result = 0;
256
257 if (!priv)
258 return -EINVAL;
259
260 if (mode == THERMAL_DEVICE_ENABLED)
261 enable = true;
262 else if (mode == THERMAL_DEVICE_DISABLED)
263 enable = false;
264 else
265 return -EINVAL;
266
267 if (enable != priv->mode) {
268 priv->mode = enable;
269 result = int3400_thermal_run_osc(priv->adev->handle,
270 priv->current_uuid_index,
271 enable);
272 }
273 return result;
274 }
275
276 static struct thermal_zone_device_ops int3400_thermal_ops = {
277 .get_temp = int3400_thermal_get_temp,
278 };
279
280 static struct thermal_zone_params int3400_thermal_params = {
281 .governor_name = "user_space",
282 .no_hwmon = true,
283 };
284
int3400_thermal_probe(struct platform_device * pdev)285 static int int3400_thermal_probe(struct platform_device *pdev)
286 {
287 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
288 struct int3400_thermal_priv *priv;
289 int result;
290
291 if (!adev)
292 return -ENODEV;
293
294 priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
295 if (!priv)
296 return -ENOMEM;
297
298 priv->adev = adev;
299
300 result = int3400_thermal_get_uuids(priv);
301 if (result)
302 goto free_priv;
303
304 result = acpi_parse_art(priv->adev->handle, &priv->art_count,
305 &priv->arts, true);
306 if (result)
307 dev_dbg(&pdev->dev, "_ART table parsing error\n");
308
309 result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
310 &priv->trts, true);
311 if (result)
312 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
313
314 platform_set_drvdata(pdev, priv);
315
316 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
317 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
318
319 priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
320 priv, &int3400_thermal_ops,
321 &int3400_thermal_params, 0, 0);
322 if (IS_ERR(priv->thermal)) {
323 result = PTR_ERR(priv->thermal);
324 goto free_art_trt;
325 }
326
327 priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
328 priv->adev->handle);
329
330 result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
331 if (result)
332 goto free_rel_misc;
333
334 result = acpi_install_notify_handler(
335 priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
336 (void *)priv);
337 if (result)
338 goto free_sysfs;
339
340 return 0;
341
342 free_sysfs:
343 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
344 free_rel_misc:
345 if (!priv->rel_misc_dev_res)
346 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
347 thermal_zone_device_unregister(priv->thermal);
348 free_art_trt:
349 kfree(priv->trts);
350 kfree(priv->arts);
351 free_priv:
352 kfree(priv);
353 return result;
354 }
355
int3400_thermal_remove(struct platform_device * pdev)356 static int int3400_thermal_remove(struct platform_device *pdev)
357 {
358 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
359
360 acpi_remove_notify_handler(
361 priv->adev->handle, ACPI_DEVICE_NOTIFY,
362 int3400_notify);
363
364 if (!priv->rel_misc_dev_res)
365 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
366
367 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
368 thermal_zone_device_unregister(priv->thermal);
369 kfree(priv->trts);
370 kfree(priv->arts);
371 kfree(priv);
372 return 0;
373 }
374
375 static const struct acpi_device_id int3400_thermal_match[] = {
376 {"INT3400", 0},
377 {}
378 };
379
380 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
381
382 static struct platform_driver int3400_thermal_driver = {
383 .probe = int3400_thermal_probe,
384 .remove = int3400_thermal_remove,
385 .driver = {
386 .name = "int3400 thermal",
387 .acpi_match_table = ACPI_PTR(int3400_thermal_match),
388 },
389 };
390
391 module_platform_driver(int3400_thermal_driver);
392
393 MODULE_DESCRIPTION("INT3400 Thermal driver");
394 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
395 MODULE_LICENSE("GPL");
396