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Linux/drivers/platform/x86/intel_menlow.c

  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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 31 
 32 #include <linux/kernel.h>
 33 #include <linux/module.h>
 34 #include <linux/init.h>
 35 #include <linux/slab.h>
 36 #include <linux/types.h>
 37 #include <linux/pci.h>
 38 #include <linux/pm.h>
 39 #include <linux/thermal.h>
 40 #include <linux/acpi.h>
 41 
 42 MODULE_AUTHOR("Thomas Sujith");
 43 MODULE_AUTHOR("Zhang Rui");
 44 MODULE_DESCRIPTION("Intel Menlow platform specific driver");
 45 MODULE_LICENSE("GPL");
 46 
 47 /*
 48  * Memory controller device control
 49  */
 50 
 51 #define MEMORY_GET_BANDWIDTH "GTHS"
 52 #define MEMORY_SET_BANDWIDTH "STHS"
 53 #define MEMORY_ARG_CUR_BANDWIDTH 1
 54 #define MEMORY_ARG_MAX_BANDWIDTH 0
 55 
 56 static void intel_menlow_unregister_sensor(void);
 57 
 58 /*
 59  * GTHS returning 'n' would mean that [0,n-1] states are supported
 60  * In that case max_cstate would be n-1
 61  * GTHS returning '' would mean that no bandwidth control states are supported
 62  */
 63 static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
 64                                     unsigned long *max_state)
 65 {
 66         struct acpi_device *device = cdev->devdata;
 67         acpi_handle handle = device->handle;
 68         unsigned long long value;
 69         struct acpi_object_list arg_list;
 70         union acpi_object arg;
 71         acpi_status status = AE_OK;
 72 
 73         arg_list.count = 1;
 74         arg_list.pointer = &arg;
 75         arg.type = ACPI_TYPE_INTEGER;
 76         arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
 77         status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
 78                                        &arg_list, &value);
 79         if (ACPI_FAILURE(status))
 80                 return -EFAULT;
 81 
 82         if (!value)
 83                 return -EINVAL;
 84 
 85         *max_state = value - 1;
 86         return 0;
 87 }
 88 
 89 static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
 90                                     unsigned long *value)
 91 {
 92         struct acpi_device *device = cdev->devdata;
 93         acpi_handle handle = device->handle;
 94         unsigned long long result;
 95         struct acpi_object_list arg_list;
 96         union acpi_object arg;
 97         acpi_status status = AE_OK;
 98 
 99         arg_list.count = 1;
100         arg_list.pointer = &arg;
101         arg.type = ACPI_TYPE_INTEGER;
102         arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
103         status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
104                                        &arg_list, &result);
105         if (ACPI_FAILURE(status))
106                 return -EFAULT;
107 
108         *value = result;
109         return 0;
110 }
111 
112 static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
113                                     unsigned long state)
114 {
115         struct acpi_device *device = cdev->devdata;
116         acpi_handle handle = device->handle;
117         struct acpi_object_list arg_list;
118         union acpi_object arg;
119         acpi_status status;
120         unsigned long long temp;
121         unsigned long max_state;
122 
123         if (memory_get_max_bandwidth(cdev, &max_state))
124                 return -EFAULT;
125 
126         if (state > max_state)
127                 return -EINVAL;
128 
129         arg_list.count = 1;
130         arg_list.pointer = &arg;
131         arg.type = ACPI_TYPE_INTEGER;
132         arg.integer.value = state;
133 
134         status =
135             acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
136                                   &temp);
137 
138         pr_info("Bandwidth value was %ld: status is %d\n", state, status);
139         if (ACPI_FAILURE(status))
140                 return -EFAULT;
141 
142         return 0;
143 }
144 
145 static struct thermal_cooling_device_ops memory_cooling_ops = {
146         .get_max_state = memory_get_max_bandwidth,
147         .get_cur_state = memory_get_cur_bandwidth,
148         .set_cur_state = memory_set_cur_bandwidth,
149 };
150 
151 /*
152  * Memory Device Management
153  */
154 static int intel_menlow_memory_add(struct acpi_device *device)
155 {
156         int result = -ENODEV;
157         struct thermal_cooling_device *cdev;
158 
159         if (!device)
160                 return -EINVAL;
161 
162         if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
163                 goto end;
164 
165         if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
166                 goto end;
167 
168         cdev = thermal_cooling_device_register("Memory controller", device,
169                                                &memory_cooling_ops);
170         if (IS_ERR(cdev)) {
171                 result = PTR_ERR(cdev);
172                 goto end;
173         }
174 
175         device->driver_data = cdev;
176         result = sysfs_create_link(&device->dev.kobj,
177                                 &cdev->device.kobj, "thermal_cooling");
178         if (result)
179                 goto unregister;
180 
181         result = sysfs_create_link(&cdev->device.kobj,
182                                 &device->dev.kobj, "device");
183         if (result) {
184                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
185                 goto unregister;
186         }
187 
188  end:
189         return result;
190 
191  unregister:
192         thermal_cooling_device_unregister(cdev);
193         return result;
194 
195 }
196 
197 static int intel_menlow_memory_remove(struct acpi_device *device)
198 {
199         struct thermal_cooling_device *cdev = acpi_driver_data(device);
200 
201         if (!device || !cdev)
202                 return -EINVAL;
203 
204         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
205         sysfs_remove_link(&cdev->device.kobj, "device");
206         thermal_cooling_device_unregister(cdev);
207 
208         return 0;
209 }
210 
211 static const struct acpi_device_id intel_menlow_memory_ids[] = {
212         {"INT0002", 0},
213         {"", 0},
214 };
215 
216 static struct acpi_driver intel_menlow_memory_driver = {
217         .name = "intel_menlow_thermal_control",
218         .ids = intel_menlow_memory_ids,
219         .ops = {
220                 .add = intel_menlow_memory_add,
221                 .remove = intel_menlow_memory_remove,
222                 },
223 };
224 
225 /*
226  * Sensor control on menlow platform
227  */
228 
229 #define THERMAL_AUX0 0
230 #define THERMAL_AUX1 1
231 #define GET_AUX0 "GAX0"
232 #define GET_AUX1 "GAX1"
233 #define SET_AUX0 "SAX0"
234 #define SET_AUX1 "SAX1"
235 
236 struct intel_menlow_attribute {
237         struct device_attribute attr;
238         struct device *device;
239         acpi_handle handle;
240         struct list_head node;
241 };
242 
243 static LIST_HEAD(intel_menlow_attr_list);
244 static DEFINE_MUTEX(intel_menlow_attr_lock);
245 
246 /*
247  * sensor_get_auxtrip - get the current auxtrip value from sensor
248  * @name: Thermalzone name
249  * @auxtype : AUX0/AUX1
250  * @buf: syfs buffer
251  */
252 static int sensor_get_auxtrip(acpi_handle handle, int index,
253                                                         unsigned long long *value)
254 {
255         acpi_status status;
256 
257         if ((index != 0 && index != 1) || !value)
258                 return -EINVAL;
259 
260         status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
261                                        NULL, value);
262         if (ACPI_FAILURE(status))
263                 return -EIO;
264 
265         return 0;
266 }
267 
268 /*
269  * sensor_set_auxtrip - set the new auxtrip value to sensor
270  * @name: Thermalzone name
271  * @auxtype : AUX0/AUX1
272  * @buf: syfs buffer
273  */
274 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
275 {
276         acpi_status status;
277         union acpi_object arg = {
278                 ACPI_TYPE_INTEGER
279         };
280         struct acpi_object_list args = {
281                 1, &arg
282         };
283         unsigned long long temp;
284 
285         if (index != 0 && index != 1)
286                 return -EINVAL;
287 
288         status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
289                                        NULL, &temp);
290         if (ACPI_FAILURE(status))
291                 return -EIO;
292         if ((index && value < temp) || (!index && value > temp))
293                 return -EINVAL;
294 
295         arg.integer.value = value;
296         status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
297                                        &args, &temp);
298         if (ACPI_FAILURE(status))
299                 return -EIO;
300 
301         /* do we need to check the return value of SAX0/SAX1 ? */
302 
303         return 0;
304 }
305 
306 #define to_intel_menlow_attr(_attr)     \
307         container_of(_attr, struct intel_menlow_attribute, attr)
308 
309 static ssize_t aux0_show(struct device *dev,
310                          struct device_attribute *dev_attr, char *buf)
311 {
312         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
313         unsigned long long value;
314         int result;
315 
316         result = sensor_get_auxtrip(attr->handle, 0, &value);
317 
318         return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
319 }
320 
321 static ssize_t aux1_show(struct device *dev,
322                          struct device_attribute *dev_attr, char *buf)
323 {
324         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
325         unsigned long long value;
326         int result;
327 
328         result = sensor_get_auxtrip(attr->handle, 1, &value);
329 
330         return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
331 }
332 
333 static ssize_t aux0_store(struct device *dev,
334                           struct device_attribute *dev_attr,
335                           const char *buf, size_t count)
336 {
337         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
338         int value;
339         int result;
340 
341         /*Sanity check; should be a positive integer */
342         if (!sscanf(buf, "%d", &value))
343                 return -EINVAL;
344 
345         if (value < 0)
346                 return -EINVAL;
347 
348         result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
349         return result ? result : count;
350 }
351 
352 static ssize_t aux1_store(struct device *dev,
353                           struct device_attribute *dev_attr,
354                           const char *buf, size_t count)
355 {
356         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
357         int value;
358         int result;
359 
360         /*Sanity check; should be a positive integer */
361         if (!sscanf(buf, "%d", &value))
362                 return -EINVAL;
363 
364         if (value < 0)
365                 return -EINVAL;
366 
367         result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
368         return result ? result : count;
369 }
370 
371 /* BIOS can enable/disable the thermal user application in dabney platform */
372 #define BIOS_ENABLED "\\_TZ.GSTS"
373 static ssize_t bios_enabled_show(struct device *dev,
374                                  struct device_attribute *attr, char *buf)
375 {
376         acpi_status status;
377         unsigned long long bios_enabled;
378 
379         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
380         if (ACPI_FAILURE(status))
381                 return -ENODEV;
382 
383         return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
384 }
385 
386 static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
387                                           void *store, struct device *dev,
388                                           acpi_handle handle)
389 {
390         struct intel_menlow_attribute *attr;
391         int result;
392 
393         attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
394         if (!attr)
395                 return -ENOMEM;
396 
397         sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
398         attr->attr.attr.name = name;
399         attr->attr.attr.mode = mode;
400         attr->attr.show = show;
401         attr->attr.store = store;
402         attr->device = dev;
403         attr->handle = handle;
404 
405         result = device_create_file(dev, &attr->attr);
406         if (result) {
407                 kfree(attr);
408                 return result;
409         }
410 
411         mutex_lock(&intel_menlow_attr_lock);
412         list_add_tail(&attr->node, &intel_menlow_attr_list);
413         mutex_unlock(&intel_menlow_attr_lock);
414 
415         return 0;
416 }
417 
418 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
419                                                 void *context, void **rv)
420 {
421         acpi_status status;
422         acpi_handle dummy;
423         struct thermal_zone_device *thermal;
424         int result;
425 
426         result = acpi_bus_get_private_data(handle, (void **)&thermal);
427         if (result)
428                 return 0;
429 
430         /* _TZ must have the AUX0/1 methods */
431         status = acpi_get_handle(handle, GET_AUX0, &dummy);
432         if (ACPI_FAILURE(status))
433                 return (status == AE_NOT_FOUND) ? AE_OK : status;
434 
435         status = acpi_get_handle(handle, SET_AUX0, &dummy);
436         if (ACPI_FAILURE(status))
437                 return (status == AE_NOT_FOUND) ? AE_OK : status;
438 
439         result = intel_menlow_add_one_attribute("aux0", 0644,
440                                                 aux0_show, aux0_store,
441                                                 &thermal->device, handle);
442         if (result)
443                 return AE_ERROR;
444 
445         status = acpi_get_handle(handle, GET_AUX1, &dummy);
446         if (ACPI_FAILURE(status))
447                 goto aux1_not_found;
448 
449         status = acpi_get_handle(handle, SET_AUX1, &dummy);
450         if (ACPI_FAILURE(status))
451                 goto aux1_not_found;
452 
453         result = intel_menlow_add_one_attribute("aux1", 0644,
454                                                 aux1_show, aux1_store,
455                                                 &thermal->device, handle);
456         if (result) {
457                 intel_menlow_unregister_sensor();
458                 return AE_ERROR;
459         }
460 
461         /*
462          * create the "dabney_enabled" attribute which means the user app
463          * should be loaded or not
464          */
465 
466         result = intel_menlow_add_one_attribute("bios_enabled", 0444,
467                                                 bios_enabled_show, NULL,
468                                                 &thermal->device, handle);
469         if (result) {
470                 intel_menlow_unregister_sensor();
471                 return AE_ERROR;
472         }
473 
474         return AE_OK;
475 
476  aux1_not_found:
477         if (status == AE_NOT_FOUND)
478                 return AE_OK;
479 
480         intel_menlow_unregister_sensor();
481         return status;
482 }
483 
484 static void intel_menlow_unregister_sensor(void)
485 {
486         struct intel_menlow_attribute *pos, *next;
487 
488         mutex_lock(&intel_menlow_attr_lock);
489         list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
490                 list_del(&pos->node);
491                 device_remove_file(pos->device, &pos->attr);
492                 kfree(pos);
493         }
494         mutex_unlock(&intel_menlow_attr_lock);
495 
496         return;
497 }
498 
499 static int __init intel_menlow_module_init(void)
500 {
501         int result = -ENODEV;
502         acpi_status status;
503         unsigned long long enable;
504 
505         if (acpi_disabled)
506                 return result;
507 
508         /* Looking for the \_TZ.GSTS method */
509         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
510         if (ACPI_FAILURE(status) || !enable)
511                 return -ENODEV;
512 
513         /* Looking for ACPI device MEM0 with hardware id INT0002 */
514         result = acpi_bus_register_driver(&intel_menlow_memory_driver);
515         if (result)
516                 return result;
517 
518         /* Looking for sensors in each ACPI thermal zone */
519         status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
520                                      ACPI_UINT32_MAX,
521                                      intel_menlow_register_sensor, NULL, NULL, NULL);
522         if (ACPI_FAILURE(status)) {
523                 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
524                 return -ENODEV;
525         }
526 
527         return 0;
528 }
529 
530 static void __exit intel_menlow_module_exit(void)
531 {
532         acpi_bus_unregister_driver(&intel_menlow_memory_driver);
533         intel_menlow_unregister_sensor();
534 }
535 
536 module_init(intel_menlow_module_init);
537 module_exit(intel_menlow_module_exit);
538 

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