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