1 /*
2 * intel_menlow.c - Intel menlow Driver for thermal management extension
3 *
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
6 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2 of the License.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 *
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23 *
24 * This driver creates the sys I/F for programming the sensors.
25 * It also implements the driver for intel menlow memory controller (hardware
26 * id is INT0002) which makes use of the platform specific ACPI methods
27 * to get/set bandwidth.
28 */
29
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/init.h>
33 #include <linux/types.h>
34 #include <linux/pci.h>
35 #include <linux/pm.h>
36
37 #include <linux/thermal.h>
38 #include <acpi/acpi_bus.h>
39 #include <acpi/acpi_drivers.h>
40
41 MODULE_AUTHOR("Thomas Sujith");
42 MODULE_AUTHOR("Zhang Rui");
43 MODULE_DESCRIPTION("Intel Menlow platform specific driver");
44 MODULE_LICENSE("GPL");
45
46 /*
47 * Memory controller device control
48 */
49
50 #define MEMORY_GET_BANDWIDTH "GTHS"
51 #define MEMORY_SET_BANDWIDTH "STHS"
52 #define MEMORY_ARG_CUR_BANDWIDTH 1
53 #define MEMORY_ARG_MAX_BANDWIDTH 0
54
55 static int memory_get_int_max_bandwidth(struct thermal_cooling_device *cdev,
56 unsigned long *max_state)
57 {
58 struct acpi_device *device = cdev->devdata;
59 acpi_handle handle = device->handle;
60 unsigned long value;
61 struct acpi_object_list arg_list;
62 union acpi_object arg;
63 acpi_status status = AE_OK;
64
65 arg_list.count = 1;
66 arg_list.pointer = &arg;
67 arg.type = ACPI_TYPE_INTEGER;
68 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
69 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
70 &arg_list, &value);
71 if (ACPI_FAILURE(status))
72 return -EFAULT;
73
74 *max_state = value - 1;
75 return 0;
76 }
77
78 static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
79 char *buf)
80 {
81 unsigned long value;
82 if (memory_get_int_max_bandwidth(cdev, &value))
83 return -EINVAL;
84
85 return sprintf(buf, "%ld\n", value);
86 }
87
88 static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
89 char *buf)
90 {
91 struct acpi_device *device = cdev->devdata;
92 acpi_handle handle = device->handle;
93 unsigned long value;
94 struct acpi_object_list arg_list;
95 union acpi_object arg;
96 acpi_status status = AE_OK;
97
98 arg_list.count = 1;
99 arg_list.pointer = &arg;
100 arg.type = ACPI_TYPE_INTEGER;
101 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
102 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
103 &arg_list, &value);
104 if (ACPI_FAILURE(status))
105 return -EFAULT;
106
107 return sprintf(buf, "%ld\n", value);
108 }
109
110 static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
111 unsigned int state)
112 {
113 struct acpi_device *device = cdev->devdata;
114 acpi_handle handle = device->handle;
115 struct acpi_object_list arg_list;
116 union acpi_object arg;
117 acpi_status status;
118 int temp;
119 unsigned long max_state;
120
121 if (memory_get_int_max_bandwidth(cdev, &max_state))
122 return -EFAULT;
123
124 if (max_state < 0 || state > max_state)
125 return -EINVAL;
126
127 arg_list.count = 1;
128 arg_list.pointer = &arg;
129 arg.type = ACPI_TYPE_INTEGER;
130 arg.integer.value = state;
131
132 status =
133 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
134 (unsigned long *)&temp);
135
136 printk(KERN_INFO
137 "Bandwidth value was %d: status is %d\n", state, status);
138 if (ACPI_FAILURE(status))
139 return -EFAULT;
140
141 return 0;
142 }
143
144 static struct thermal_cooling_device_ops memory_cooling_ops = {
145 .get_max_state = memory_get_max_bandwidth,
146 .get_cur_state = memory_get_cur_bandwidth,
147 .set_cur_state = memory_set_cur_bandwidth,
148 };
149
150 /*
151 * Memory Device Management
152 */
153 static int intel_menlow_memory_add(struct acpi_device *device)
154 {
155 int result = -ENODEV;
156 acpi_status status = AE_OK;
157 acpi_handle dummy;
158 struct thermal_cooling_device *cdev;
159
160 if (!device)
161 return -EINVAL;
162
163 status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
164 if (ACPI_FAILURE(status))
165 goto end;
166
167 status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
168 if (ACPI_FAILURE(status))
169 goto end;
170
171 cdev = thermal_cooling_device_register("Memory controller", device,
172 &memory_cooling_ops);
173 if (IS_ERR(cdev)) {
174 result = PTR_ERR(cdev);
175 goto end;
176 }
177
178 if (cdev) {
179 acpi_driver_data(device) = cdev;
180 result = sysfs_create_link(&device->dev.kobj,
181 &cdev->device.kobj, "thermal_cooling");
182 if (result)
183 goto unregister;
184
185 result = sysfs_create_link(&cdev->device.kobj,
186 &device->dev.kobj, "device");
187 if (result) {
188 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
189 goto unregister;
190 }
191 }
192
193 end:
194 return result;
195
196 unregister:
197 thermal_cooling_device_unregister(cdev);
198 return result;
199
200 }
201
202 static int intel_menlow_memory_remove(struct acpi_device *device, int type)
203 {
204 struct thermal_cooling_device *cdev = acpi_driver_data(device);
205
206 if (!device || !cdev)
207 return -EINVAL;
208
209 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
210 sysfs_remove_link(&cdev->device.kobj, "device");
211 thermal_cooling_device_unregister(cdev);
212
213 return 0;
214 }
215
216 const static struct acpi_device_id intel_menlow_memory_ids[] = {
217 {"INT0002", 0},
218 {"", 0},
219 };
220
221 static struct acpi_driver intel_menlow_memory_driver = {
222 .name = "intel_menlow_thermal_control",
223 .ids = intel_menlow_memory_ids,
224 .ops = {
225 .add = intel_menlow_memory_add,
226 .remove = intel_menlow_memory_remove,
227 },
228 };
229
230 /*
231 * Sensor control on menlow platform
232 */
233
234 #define THERMAL_AUX0 0
235 #define THERMAL_AUX1 1
236 #define GET_AUX0 "GAX0"
237 #define GET_AUX1 "GAX1"
238 #define SET_AUX0 "SAX0"
239 #define SET_AUX1 "SAX1"
240
241 struct intel_menlow_attribute {
242 struct device_attribute attr;
243 struct device *device;
244 acpi_handle handle;
245 struct list_head node;
246 };
247
248 static LIST_HEAD(intel_menlow_attr_list);
249 static DEFINE_MUTEX(intel_menlow_attr_lock);
250
251 /*
252 * sensor_get_auxtrip - get the current auxtrip value from sensor
253 * @name: Thermalzone name
254 * @auxtype : AUX0/AUX1
255 * @buf: syfs buffer
256 */
257 static int sensor_get_auxtrip(acpi_handle handle, int index, int *value)
258 {
259 acpi_status status;
260
261 if ((index != 0 && index != 1) || !value)
262 return -EINVAL;
263
264 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
265 NULL, (unsigned long *)value);
266 if (ACPI_FAILURE(status))
267 return -EIO;
268
269 return 0;
270 }
271
272 /*
273 * sensor_set_auxtrip - set the new auxtrip value to sensor
274 * @name: Thermalzone name
275 * @auxtype : AUX0/AUX1
276 * @buf: syfs buffer
277 */
278 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
279 {
280 acpi_status status;
281 union acpi_object arg = {
282 ACPI_TYPE_INTEGER
283 };
284 struct acpi_object_list args = {
285 1, &arg
286 };
287 int temp;
288
289 if (index != 0 && index != 1)
290 return -EINVAL;
291
292 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
293 NULL, (unsigned long *)&temp);
294 if (ACPI_FAILURE(status))
295 return -EIO;
296 if ((index && value < temp) || (!index && value > temp))
297 return -EINVAL;
298
299 arg.integer.value = value;
300 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
301 &args, (unsigned long *)&temp);
302 if (ACPI_FAILURE(status))
303 return -EIO;
304
305 /* do we need to check the return value of SAX0/SAX1 ? */
306
307 return 0;
308 }
309
310 #define to_intel_menlow_attr(_attr) \
311 container_of(_attr, struct intel_menlow_attribute, attr)
312
313 static ssize_t aux0_show(struct device *dev,
314 struct device_attribute *dev_attr, char *buf)
315 {
316 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
317 int value;
318 int result;
319
320 result = sensor_get_auxtrip(attr->handle, 0, &value);
321
322 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
323 }
324
325 static ssize_t aux1_show(struct device *dev,
326 struct device_attribute *dev_attr, char *buf)
327 {
328 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
329 int value;
330 int result;
331
332 result = sensor_get_auxtrip(attr->handle, 1, &value);
333
334 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
335 }
336
337 static ssize_t aux0_store(struct device *dev,
338 struct device_attribute *dev_attr,
339 const char *buf, size_t count)
340 {
341 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
342 int value;
343 int result;
344
345 /*Sanity check; should be a positive integer */
346 if (!sscanf(buf, "%d", &value))
347 return -EINVAL;
348
349 if (value < 0)
350 return -EINVAL;
351
352 result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
353 return result ? result : count;
354 }
355
356 static ssize_t aux1_store(struct device *dev,
357 struct device_attribute *dev_attr,
358 const char *buf, size_t count)
359 {
360 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
361 int value;
362 int result;
363
364 /*Sanity check; should be a positive integer */
365 if (!sscanf(buf, "%d", &value))
366 return -EINVAL;
367
368 if (value < 0)
369 return -EINVAL;
370
371 result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
372 return result ? result : count;
373 }
374
375 /* BIOS can enable/disable the thermal user application in dabney platform */
376 #define BIOS_ENABLED "\\_TZ.GSTS"
377 static ssize_t bios_enabled_show(struct device *dev,
378 struct device_attribute *attr, char *buf)
379 {
380 acpi_status status;
381 unsigned long bios_enabled;
382
383 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
384 if (ACPI_FAILURE(status))
385 return -ENODEV;
386
387 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
388 }
389
390 static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
391 void *store, struct device *dev,
392 acpi_handle handle)
393 {
394 struct intel_menlow_attribute *attr;
395 int result;
396
397 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
398 if (!attr)
399 return -ENOMEM;
400
401 attr->attr.attr.name = name;
402 attr->attr.attr.mode = mode;
403 attr->attr.show = show;
404 attr->attr.store = store;
405 attr->device = dev;
406 attr->handle = handle;
407
408 result = device_create_file(dev, &attr->attr);
409 if (result)
410 return result;
411
412 mutex_lock(&intel_menlow_attr_lock);
413 list_add_tail(&attr->node, &intel_menlow_attr_list);
414 mutex_unlock(&intel_menlow_attr_lock);
415
416 return 0;
417 }
418
419 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
420 void *context, void **rv)
421 {
422 acpi_status status;
423 acpi_handle dummy;
424 struct thermal_zone_device *thermal;
425 int result;
426
427 result = acpi_bus_get_private_data(handle, (void **)&thermal);
428 if (result)
429 return 0;
430
431 /* _TZ must have the AUX0/1 methods */
432 status = acpi_get_handle(handle, GET_AUX0, &dummy);
433 if (ACPI_FAILURE(status))
434 goto not_found;
435
436 status = acpi_get_handle(handle, SET_AUX0, &dummy);
437 if (ACPI_FAILURE(status))
438 goto not_found;
439
440 result = intel_menlow_add_one_attribute("aux0", 0644,
441 aux0_show, aux0_store,
442 &thermal->device, handle);
443 if (result)
444 return AE_ERROR;
445
446 status = acpi_get_handle(handle, GET_AUX1, &dummy);
447 if (ACPI_FAILURE(status))
448 goto not_found;
449
450 status = acpi_get_handle(handle, SET_AUX1, &dummy);
451 if (ACPI_FAILURE(status))
452 goto not_found;
453
454 result = intel_menlow_add_one_attribute("aux1", 0644,
455 aux1_show, aux1_store,
456 &thermal->device, handle);
457 if (result)
458 return AE_ERROR;
459
460 /*
461 * create the "dabney_enabled" attribute which means the user app
462 * should be loaded or not
463 */
464
465 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
466 bios_enabled_show, NULL,
467 &thermal->device, handle);
468 if (result)
469 return AE_ERROR;
470
471 not_found:
472 if (status == AE_NOT_FOUND)
473 return AE_OK;
474 else
475 return status;
476 }
477
478 static void intel_menlow_unregister_sensor(void)
479 {
480 struct intel_menlow_attribute *pos, *next;
481
482 mutex_lock(&intel_menlow_attr_lock);
483 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
484 list_del(&pos->node);
485 device_remove_file(pos->device, &pos->attr);
486 kfree(pos);
487 }
488 mutex_unlock(&intel_menlow_attr_lock);
489
490 return;
491 }
492
493 static int __init intel_menlow_module_init(void)
494 {
495 int result = -ENODEV;
496 acpi_status status;
497 unsigned long enable;
498
499 if (acpi_disabled)
500 return result;
501
502 /* Looking for the \_TZ.GSTS method */
503 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
504 if (ACPI_FAILURE(status) || !enable)
505 return -ENODEV;
506
507 /* Looking for ACPI device MEM0 with hardware id INT0002 */
508 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
509 if (result)
510 return result;
511
512 /* Looking for sensors in each ACPI thermal zone */
513 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
514 ACPI_UINT32_MAX,
515 intel_menlow_register_sensor, NULL, NULL);
516 if (ACPI_FAILURE(status))
517 return -ENODEV;
518
519 return 0;
520 }
521
522 static void __exit intel_menlow_module_exit(void)
523 {
524 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
525 intel_menlow_unregister_sensor();
526 }
527
528 module_init(intel_menlow_module_init);
529 module_exit(intel_menlow_module_exit);
530
|
This page was automatically generated by the
LXR engine.
|