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15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17#include <linux/acpi.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/pci.h>
21#include <linux/pm.h>
22#include <linux/slab.h>
23#include <linux/thermal.h>
24#include <linux/types.h>
25#include <linux/units.h>
26
27MODULE_AUTHOR("Thomas Sujith");
28MODULE_AUTHOR("Zhang Rui");
29MODULE_DESCRIPTION("Intel Menlow platform specific driver");
30MODULE_LICENSE("GPL v2");
31
32
33
34
35
36#define MEMORY_GET_BANDWIDTH "GTHS"
37#define MEMORY_SET_BANDWIDTH "STHS"
38#define MEMORY_ARG_CUR_BANDWIDTH 1
39#define MEMORY_ARG_MAX_BANDWIDTH 0
40
41static void intel_menlow_unregister_sensor(void);
42
43
44
45
46
47
48static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
49 unsigned long *max_state)
50{
51 struct acpi_device *device = cdev->devdata;
52 acpi_handle handle = device->handle;
53 unsigned long long value;
54 struct acpi_object_list arg_list;
55 union acpi_object arg;
56 acpi_status status = AE_OK;
57
58 arg_list.count = 1;
59 arg_list.pointer = &arg;
60 arg.type = ACPI_TYPE_INTEGER;
61 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
62 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
63 &arg_list, &value);
64 if (ACPI_FAILURE(status))
65 return -EFAULT;
66
67 if (!value)
68 return -EINVAL;
69
70 *max_state = value - 1;
71 return 0;
72}
73
74static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
75 unsigned long *value)
76{
77 struct acpi_device *device = cdev->devdata;
78 acpi_handle handle = device->handle;
79 unsigned long long result;
80 struct acpi_object_list arg_list;
81 union acpi_object arg;
82 acpi_status status = AE_OK;
83
84 arg_list.count = 1;
85 arg_list.pointer = &arg;
86 arg.type = ACPI_TYPE_INTEGER;
87 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
88 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
89 &arg_list, &result);
90 if (ACPI_FAILURE(status))
91 return -EFAULT;
92
93 *value = result;
94 return 0;
95}
96
97static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
98 unsigned long state)
99{
100 struct acpi_device *device = cdev->devdata;
101 acpi_handle handle = device->handle;
102 struct acpi_object_list arg_list;
103 union acpi_object arg;
104 acpi_status status;
105 unsigned long long temp;
106 unsigned long max_state;
107
108 if (memory_get_max_bandwidth(cdev, &max_state))
109 return -EFAULT;
110
111 if (state > max_state)
112 return -EINVAL;
113
114 arg_list.count = 1;
115 arg_list.pointer = &arg;
116 arg.type = ACPI_TYPE_INTEGER;
117 arg.integer.value = state;
118
119 status =
120 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
121 &temp);
122
123 pr_info("Bandwidth value was %ld: status is %d\n", state, status);
124 if (ACPI_FAILURE(status))
125 return -EFAULT;
126
127 return 0;
128}
129
130static const struct thermal_cooling_device_ops memory_cooling_ops = {
131 .get_max_state = memory_get_max_bandwidth,
132 .get_cur_state = memory_get_cur_bandwidth,
133 .set_cur_state = memory_set_cur_bandwidth,
134};
135
136
137
138
139static int intel_menlow_memory_add(struct acpi_device *device)
140{
141 int result = -ENODEV;
142 struct thermal_cooling_device *cdev;
143
144 if (!device)
145 return -EINVAL;
146
147 if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
148 goto end;
149
150 if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
151 goto end;
152
153 cdev = thermal_cooling_device_register("Memory controller", device,
154 &memory_cooling_ops);
155 if (IS_ERR(cdev)) {
156 result = PTR_ERR(cdev);
157 goto end;
158 }
159
160 device->driver_data = cdev;
161 result = sysfs_create_link(&device->dev.kobj,
162 &cdev->device.kobj, "thermal_cooling");
163 if (result)
164 goto unregister;
165
166 result = sysfs_create_link(&cdev->device.kobj,
167 &device->dev.kobj, "device");
168 if (result) {
169 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
170 goto unregister;
171 }
172
173 end:
174 return result;
175
176 unregister:
177 thermal_cooling_device_unregister(cdev);
178 return result;
179
180}
181
182static int intel_menlow_memory_remove(struct acpi_device *device)
183{
184 struct thermal_cooling_device *cdev;
185
186 if (!device)
187 return -EINVAL;
188
189 cdev = acpi_driver_data(device);
190 if (!cdev)
191 return -EINVAL;
192
193 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
194 sysfs_remove_link(&cdev->device.kobj, "device");
195 thermal_cooling_device_unregister(cdev);
196
197 return 0;
198}
199
200static const struct acpi_device_id intel_menlow_memory_ids[] = {
201 {"INT0002", 0},
202 {"", 0},
203};
204
205static struct acpi_driver intel_menlow_memory_driver = {
206 .name = "intel_menlow_thermal_control",
207 .ids = intel_menlow_memory_ids,
208 .ops = {
209 .add = intel_menlow_memory_add,
210 .remove = intel_menlow_memory_remove,
211 },
212};
213
214
215
216
217
218#define THERMAL_AUX0 0
219#define THERMAL_AUX1 1
220#define GET_AUX0 "GAX0"
221#define GET_AUX1 "GAX1"
222#define SET_AUX0 "SAX0"
223#define SET_AUX1 "SAX1"
224
225struct intel_menlow_attribute {
226 struct device_attribute attr;
227 struct device *device;
228 acpi_handle handle;
229 struct list_head node;
230};
231
232static LIST_HEAD(intel_menlow_attr_list);
233static DEFINE_MUTEX(intel_menlow_attr_lock);
234
235
236
237
238
239
240
241static int sensor_get_auxtrip(acpi_handle handle, int index,
242 unsigned long long *value)
243{
244 acpi_status status;
245
246 if ((index != 0 && index != 1) || !value)
247 return -EINVAL;
248
249 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
250 NULL, value);
251 if (ACPI_FAILURE(status))
252 return -EIO;
253
254 return 0;
255}
256
257
258
259
260
261
262
263static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
264{
265 acpi_status status;
266 union acpi_object arg = {
267 ACPI_TYPE_INTEGER
268 };
269 struct acpi_object_list args = {
270 1, &arg
271 };
272 unsigned long long temp;
273
274 if (index != 0 && index != 1)
275 return -EINVAL;
276
277 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
278 NULL, &temp);
279 if (ACPI_FAILURE(status))
280 return -EIO;
281 if ((index && value < temp) || (!index && value > temp))
282 return -EINVAL;
283
284 arg.integer.value = value;
285 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
286 &args, &temp);
287 if (ACPI_FAILURE(status))
288 return -EIO;
289
290
291
292 return 0;
293}
294
295#define to_intel_menlow_attr(_attr) \
296 container_of(_attr, struct intel_menlow_attribute, attr)
297
298static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
299 char *buf, int idx)
300{
301 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
302 unsigned long long value;
303 int result;
304
305 result = sensor_get_auxtrip(attr->handle, idx, &value);
306 if (result)
307 return result;
308
309 return sprintf(buf, "%lu", deci_kelvin_to_celsius(value));
310}
311
312static ssize_t aux0_show(struct device *dev,
313 struct device_attribute *dev_attr, char *buf)
314{
315 return aux_show(dev, dev_attr, buf, 0);
316}
317
318static ssize_t aux1_show(struct device *dev,
319 struct device_attribute *dev_attr, char *buf)
320{
321 return aux_show(dev, dev_attr, buf, 1);
322}
323
324static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
325 const char *buf, size_t count, int idx)
326{
327 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
328 int value;
329 int result;
330
331
332 if (!sscanf(buf, "%d", &value))
333 return -EINVAL;
334
335 if (value < 0)
336 return -EINVAL;
337
338 result = sensor_set_auxtrip(attr->handle, idx,
339 celsius_to_deci_kelvin(value));
340 return result ? result : count;
341}
342
343static ssize_t aux0_store(struct device *dev,
344 struct device_attribute *dev_attr,
345 const char *buf, size_t count)
346{
347 return aux_store(dev, dev_attr, buf, count, 0);
348}
349
350static ssize_t aux1_store(struct device *dev,
351 struct device_attribute *dev_attr,
352 const char *buf, size_t count)
353{
354 return aux_store(dev, dev_attr, buf, count, 1);
355}
356
357
358#define BIOS_ENABLED "\\_TZ.GSTS"
359static ssize_t bios_enabled_show(struct device *dev,
360 struct device_attribute *attr, char *buf)
361{
362 acpi_status status;
363 unsigned long long bios_enabled;
364
365 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
366 if (ACPI_FAILURE(status))
367 return -ENODEV;
368
369 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
370}
371
372static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
373 void *store, struct device *dev,
374 acpi_handle handle)
375{
376 struct intel_menlow_attribute *attr;
377 int result;
378
379 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
380 if (!attr)
381 return -ENOMEM;
382
383 sysfs_attr_init(&attr->attr.attr);
384 attr->attr.attr.name = name;
385 attr->attr.attr.mode = mode;
386 attr->attr.show = show;
387 attr->attr.store = store;
388 attr->device = dev;
389 attr->handle = handle;
390
391 result = device_create_file(dev, &attr->attr);
392 if (result) {
393 kfree(attr);
394 return result;
395 }
396
397 mutex_lock(&intel_menlow_attr_lock);
398 list_add_tail(&attr->node, &intel_menlow_attr_list);
399 mutex_unlock(&intel_menlow_attr_lock);
400
401 return 0;
402}
403
404static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
405 void *context, void **rv)
406{
407 acpi_status status;
408 acpi_handle dummy;
409 struct thermal_zone_device *thermal;
410 int result;
411
412 result = acpi_bus_get_private_data(handle, (void **)&thermal);
413 if (result)
414 return 0;
415
416
417 status = acpi_get_handle(handle, GET_AUX0, &dummy);
418 if (ACPI_FAILURE(status))
419 return (status == AE_NOT_FOUND) ? AE_OK : status;
420
421 status = acpi_get_handle(handle, SET_AUX0, &dummy);
422 if (ACPI_FAILURE(status))
423 return (status == AE_NOT_FOUND) ? AE_OK : status;
424
425 result = intel_menlow_add_one_attribute("aux0", 0644,
426 aux0_show, aux0_store,
427 &thermal->device, handle);
428 if (result)
429 return AE_ERROR;
430
431 status = acpi_get_handle(handle, GET_AUX1, &dummy);
432 if (ACPI_FAILURE(status))
433 goto aux1_not_found;
434
435 status = acpi_get_handle(handle, SET_AUX1, &dummy);
436 if (ACPI_FAILURE(status))
437 goto aux1_not_found;
438
439 result = intel_menlow_add_one_attribute("aux1", 0644,
440 aux1_show, aux1_store,
441 &thermal->device, handle);
442 if (result) {
443 intel_menlow_unregister_sensor();
444 return AE_ERROR;
445 }
446
447
448
449
450
451
452 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
453 bios_enabled_show, NULL,
454 &thermal->device, handle);
455 if (result) {
456 intel_menlow_unregister_sensor();
457 return AE_ERROR;
458 }
459
460 return AE_OK;
461
462 aux1_not_found:
463 if (status == AE_NOT_FOUND)
464 return AE_OK;
465
466 intel_menlow_unregister_sensor();
467 return status;
468}
469
470static void intel_menlow_unregister_sensor(void)
471{
472 struct intel_menlow_attribute *pos, *next;
473
474 mutex_lock(&intel_menlow_attr_lock);
475 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
476 list_del(&pos->node);
477 device_remove_file(pos->device, &pos->attr);
478 kfree(pos);
479 }
480 mutex_unlock(&intel_menlow_attr_lock);
481
482 return;
483}
484
485static int __init intel_menlow_module_init(void)
486{
487 int result = -ENODEV;
488 acpi_status status;
489 unsigned long long enable;
490
491 if (acpi_disabled)
492 return result;
493
494
495 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
496 if (ACPI_FAILURE(status) || !enable)
497 return -ENODEV;
498
499
500 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
501 if (result)
502 return result;
503
504
505 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
506 ACPI_UINT32_MAX,
507 intel_menlow_register_sensor, NULL, NULL, NULL);
508 if (ACPI_FAILURE(status)) {
509 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
510 return -ENODEV;
511 }
512
513 return 0;
514}
515
516static void __exit intel_menlow_module_exit(void)
517{
518 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
519 intel_menlow_unregister_sensor();
520}
521
522module_init(intel_menlow_module_init);
523module_exit(intel_menlow_module_exit);
524
