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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
19enum int3400_thermal_uuid {
20 INT3400_THERMAL_PASSIVE_1,
21 INT3400_THERMAL_ACTIVE,
22 INT3400_THERMAL_CRITICAL,
23 INT3400_THERMAL_MAXIMUM_UUID,
24};
25
26static u8 *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
27 "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
28 "3A95C389-E4B8-4629-A526-C52C88626BAE",
29 "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
30};
31
32struct int3400_thermal_priv {
33 struct acpi_device *adev;
34 struct thermal_zone_device *thermal;
35 int mode;
36 int art_count;
37 struct art *arts;
38 int trt_count;
39 struct trt *trts;
40 u8 uuid_bitmap;
41 int rel_misc_dev_res;
42 int current_uuid_index;
43};
44
45static ssize_t available_uuids_show(struct device *dev,
46 struct device_attribute *attr,
47 char *buf)
48{
49 struct platform_device *pdev = to_platform_device(dev);
50 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
51 int i;
52 int length = 0;
53
54 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
55 if (priv->uuid_bitmap & (1 << i))
56 if (PAGE_SIZE - length > 0)
57 length += snprintf(&buf[length],
58 PAGE_SIZE - length,
59 "%s\n",
60 int3400_thermal_uuids[i]);
61 }
62
63 return length;
64}
65
66static ssize_t current_uuid_show(struct device *dev,
67 struct device_attribute *devattr, char *buf)
68{
69 struct platform_device *pdev = to_platform_device(dev);
70 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
71
72 if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
73 return sprintf(buf, "%s\n",
74 int3400_thermal_uuids[priv->current_uuid_index]);
75 else
76 return sprintf(buf, "INVALID\n");
77}
78
79static ssize_t current_uuid_store(struct device *dev,
80 struct device_attribute *attr,
81 const char *buf, size_t count)
82{
83 struct platform_device *pdev = to_platform_device(dev);
84 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
85 int i;
86
87 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
88 if ((priv->uuid_bitmap & (1 << i)) &&
89 !(strncmp(buf, int3400_thermal_uuids[i],
90 sizeof(int3400_thermal_uuids[i]) - 1))) {
91 priv->current_uuid_index = i;
92 return count;
93 }
94 }
95
96 return -EINVAL;
97}
98
99static DEVICE_ATTR(current_uuid, 0644, current_uuid_show, current_uuid_store);
100static DEVICE_ATTR_RO(available_uuids);
101static struct attribute *uuid_attrs[] = {
102 &dev_attr_available_uuids.attr,
103 &dev_attr_current_uuid.attr,
104 NULL
105};
106
107static struct attribute_group uuid_attribute_group = {
108 .attrs = uuid_attrs,
109 .name = "uuids"
110};
111
112static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
113{
114 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
115 union acpi_object *obja, *objb;
116 int i, j;
117 int result = 0;
118 acpi_status status;
119
120 status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
121 if (ACPI_FAILURE(status))
122 return -ENODEV;
123
124 obja = (union acpi_object *)buf.pointer;
125 if (obja->type != ACPI_TYPE_PACKAGE) {
126 result = -EINVAL;
127 goto end;
128 }
129
130 for (i = 0; i < obja->package.count; i++) {
131 objb = &obja->package.elements[i];
132 if (objb->type != ACPI_TYPE_BUFFER) {
133 result = -EINVAL;
134 goto end;
135 }
136
137
138 if (objb->buffer.length != 16) {
139 result = -EINVAL;
140 goto end;
141 }
142
143 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
144 u8 uuid[16];
145
146 acpi_str_to_uuid(int3400_thermal_uuids[j], uuid);
147 if (!strncmp(uuid, objb->buffer.pointer, 16)) {
148 priv->uuid_bitmap |= (1 << j);
149 break;
150 }
151 }
152 }
153
154end:
155 kfree(buf.pointer);
156 return result;
157}
158
159static int int3400_thermal_run_osc(acpi_handle handle,
160 enum int3400_thermal_uuid uuid, bool enable)
161{
162 u32 ret, buf[2];
163 acpi_status status;
164 int result = 0;
165 struct acpi_osc_context context = {
166 .uuid_str = int3400_thermal_uuids[uuid],
167 .rev = 1,
168 .cap.length = 8,
169 };
170
171 buf[OSC_QUERY_DWORD] = 0;
172 buf[OSC_SUPPORT_DWORD] = enable;
173
174 context.cap.pointer = buf;
175
176 status = acpi_run_osc(handle, &context);
177 if (ACPI_SUCCESS(status)) {
178 ret = *((u32 *)(context.ret.pointer + 4));
179 if (ret != enable)
180 result = -EPERM;
181 } else
182 result = -EPERM;
183
184 kfree(context.ret.pointer);
185 return result;
186}
187
188static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
189 int *temp)
190{
191 *temp = 20 * 1000;
192 return 0;
193}
194
195static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
196 enum thermal_device_mode *mode)
197{
198 struct int3400_thermal_priv *priv = thermal->devdata;
199
200 if (!priv)
201 return -EINVAL;
202
203 *mode = priv->mode;
204
205 return 0;
206}
207
208static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
209 enum thermal_device_mode mode)
210{
211 struct int3400_thermal_priv *priv = thermal->devdata;
212 bool enable;
213 int result = 0;
214
215 if (!priv)
216 return -EINVAL;
217
218 if (mode == THERMAL_DEVICE_ENABLED)
219 enable = true;
220 else if (mode == THERMAL_DEVICE_DISABLED)
221 enable = false;
222 else
223 return -EINVAL;
224
225 if (enable != priv->mode) {
226 priv->mode = enable;
227 result = int3400_thermal_run_osc(priv->adev->handle,
228 priv->current_uuid_index,
229 enable);
230 }
231 return result;
232}
233
234static struct thermal_zone_device_ops int3400_thermal_ops = {
235 .get_temp = int3400_thermal_get_temp,
236};
237
238static struct thermal_zone_params int3400_thermal_params = {
239 .governor_name = "user_space",
240 .no_hwmon = true,
241};
242
243static int int3400_thermal_probe(struct platform_device *pdev)
244{
245 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
246 struct int3400_thermal_priv *priv;
247 int result;
248
249 if (!adev)
250 return -ENODEV;
251
252 priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
253 if (!priv)
254 return -ENOMEM;
255
256 priv->adev = adev;
257
258 result = int3400_thermal_get_uuids(priv);
259 if (result)
260 goto free_priv;
261
262 result = acpi_parse_art(priv->adev->handle, &priv->art_count,
263 &priv->arts, true);
264 if (result)
265 dev_dbg(&pdev->dev, "_ART table parsing error\n");
266
267 result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
268 &priv->trts, true);
269 if (result)
270 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
271
272 platform_set_drvdata(pdev, priv);
273
274 if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
275 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
276 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
277 }
278 priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
279 priv, &int3400_thermal_ops,
280 &int3400_thermal_params, 0, 0);
281 if (IS_ERR(priv->thermal)) {
282 result = PTR_ERR(priv->thermal);
283 goto free_art_trt;
284 }
285
286 priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
287 priv->adev->handle);
288
289 result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
290 if (result)
291 goto free_zone;
292
293 return 0;
294
295free_zone:
296 thermal_zone_device_unregister(priv->thermal);
297free_art_trt:
298 kfree(priv->trts);
299 kfree(priv->arts);
300free_priv:
301 kfree(priv);
302 return result;
303}
304
305static int int3400_thermal_remove(struct platform_device *pdev)
306{
307 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
308
309 if (!priv->rel_misc_dev_res)
310 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
311
312 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
313 thermal_zone_device_unregister(priv->thermal);
314 kfree(priv->trts);
315 kfree(priv->arts);
316 kfree(priv);
317 return 0;
318}
319
320static const struct acpi_device_id int3400_thermal_match[] = {
321 {"INT3400", 0},
322 {}
323};
324
325MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
326
327static struct platform_driver int3400_thermal_driver = {
328 .probe = int3400_thermal_probe,
329 .remove = int3400_thermal_remove,
330 .driver = {
331 .name = "int3400 thermal",
332 .acpi_match_table = ACPI_PTR(int3400_thermal_match),
333 },
334};
335
336module_platform_driver(int3400_thermal_driver);
337
338MODULE_DESCRIPTION("INT3400 Thermal driver");
339MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
340MODULE_LICENSE("GPL");
341
