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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 aux_show(struct device *dev, struct device_attribute *dev_attr,
310                         char *buf, int idx)
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, idx, &value);
317 
318         return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value));
319 }
320 
321 static ssize_t aux0_show(struct device *dev,
322                          struct device_attribute *dev_attr, char *buf)
323 {
324         return aux_show(dev, dev_attr, buf, 0);
325 }
326 
327 static ssize_t aux1_show(struct device *dev,
328                          struct device_attribute *dev_attr, char *buf)
329 {
330         return aux_show(dev, dev_attr, buf, 1);
331 }
332 
333 static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
334                          const char *buf, size_t count, int idx)
335 {
336         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
337         int value;
338         int result;
339 
340         /*Sanity check; should be a positive integer */
341         if (!sscanf(buf, "%d", &value))
342                 return -EINVAL;
343 
344         if (value < 0)
345                 return -EINVAL;
346 
347         result = sensor_set_auxtrip(attr->handle, idx, 
348                                     CELSIUS_TO_DECI_KELVIN(value));
349         return result ? result : count;
350 }
351 
352 static ssize_t aux0_store(struct device *dev,
353                           struct device_attribute *dev_attr,
354                           const char *buf, size_t count)
355 {
356         return aux_store(dev, dev_attr, buf, count, 0);
357 }
358 
359 static ssize_t aux1_store(struct device *dev,
360                           struct device_attribute *dev_attr,
361                           const char *buf, size_t count)
362 {
363         return aux_store(dev, dev_attr, buf, count, 1);
364 }
365 
366 /* BIOS can enable/disable the thermal user application in dabney platform */
367 #define BIOS_ENABLED "\\_TZ.GSTS"
368 static ssize_t bios_enabled_show(struct device *dev,
369                                  struct device_attribute *attr, char *buf)
370 {
371         acpi_status status;
372         unsigned long long bios_enabled;
373 
374         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
375         if (ACPI_FAILURE(status))
376                 return -ENODEV;
377 
378         return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
379 }
380 
381 static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
382                                           void *store, struct device *dev,
383                                           acpi_handle handle)
384 {
385         struct intel_menlow_attribute *attr;
386         int result;
387 
388         attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
389         if (!attr)
390                 return -ENOMEM;
391 
392         sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
393         attr->attr.attr.name = name;
394         attr->attr.attr.mode = mode;
395         attr->attr.show = show;
396         attr->attr.store = store;
397         attr->device = dev;
398         attr->handle = handle;
399 
400         result = device_create_file(dev, &attr->attr);
401         if (result) {
402                 kfree(attr);
403                 return result;
404         }
405 
406         mutex_lock(&intel_menlow_attr_lock);
407         list_add_tail(&attr->node, &intel_menlow_attr_list);
408         mutex_unlock(&intel_menlow_attr_lock);
409 
410         return 0;
411 }
412 
413 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
414                                                 void *context, void **rv)
415 {
416         acpi_status status;
417         acpi_handle dummy;
418         struct thermal_zone_device *thermal;
419         int result;
420 
421         result = acpi_bus_get_private_data(handle, (void **)&thermal);
422         if (result)
423                 return 0;
424 
425         /* _TZ must have the AUX0/1 methods */
426         status = acpi_get_handle(handle, GET_AUX0, &dummy);
427         if (ACPI_FAILURE(status))
428                 return (status == AE_NOT_FOUND) ? AE_OK : status;
429 
430         status = acpi_get_handle(handle, SET_AUX0, &dummy);
431         if (ACPI_FAILURE(status))
432                 return (status == AE_NOT_FOUND) ? AE_OK : status;
433 
434         result = intel_menlow_add_one_attribute("aux0", 0644,
435                                                 aux0_show, aux0_store,
436                                                 &thermal->device, handle);
437         if (result)
438                 return AE_ERROR;
439 
440         status = acpi_get_handle(handle, GET_AUX1, &dummy);
441         if (ACPI_FAILURE(status))
442                 goto aux1_not_found;
443 
444         status = acpi_get_handle(handle, SET_AUX1, &dummy);
445         if (ACPI_FAILURE(status))
446                 goto aux1_not_found;
447 
448         result = intel_menlow_add_one_attribute("aux1", 0644,
449                                                 aux1_show, aux1_store,
450                                                 &thermal->device, handle);
451         if (result) {
452                 intel_menlow_unregister_sensor();
453                 return AE_ERROR;
454         }
455 
456         /*
457          * create the "dabney_enabled" attribute which means the user app
458          * should be loaded or not
459          */
460 
461         result = intel_menlow_add_one_attribute("bios_enabled", 0444,
462                                                 bios_enabled_show, NULL,
463                                                 &thermal->device, handle);
464         if (result) {
465                 intel_menlow_unregister_sensor();
466                 return AE_ERROR;
467         }
468 
469         return AE_OK;
470 
471  aux1_not_found:
472         if (status == AE_NOT_FOUND)
473                 return AE_OK;
474 
475         intel_menlow_unregister_sensor();
476         return status;
477 }
478 
479 static void intel_menlow_unregister_sensor(void)
480 {
481         struct intel_menlow_attribute *pos, *next;
482 
483         mutex_lock(&intel_menlow_attr_lock);
484         list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
485                 list_del(&pos->node);
486                 device_remove_file(pos->device, &pos->attr);
487                 kfree(pos);
488         }
489         mutex_unlock(&intel_menlow_attr_lock);
490 
491         return;
492 }
493 
494 static int __init intel_menlow_module_init(void)
495 {
496         int result = -ENODEV;
497         acpi_status status;
498         unsigned long long enable;
499 
500         if (acpi_disabled)
501                 return result;
502 
503         /* Looking for the \_TZ.GSTS method */
504         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
505         if (ACPI_FAILURE(status) || !enable)
506                 return -ENODEV;
507 
508         /* Looking for ACPI device MEM0 with hardware id INT0002 */
509         result = acpi_bus_register_driver(&intel_menlow_memory_driver);
510         if (result)
511                 return result;
512 
513         /* Looking for sensors in each ACPI thermal zone */
514         status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
515                                      ACPI_UINT32_MAX,
516                                      intel_menlow_register_sensor, NULL, NULL, NULL);
517         if (ACPI_FAILURE(status)) {
518                 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
519                 return -ENODEV;
520         }
521 
522         return 0;
523 }
524 
525 static void __exit intel_menlow_module_exit(void)
526 {
527         acpi_bus_unregister_driver(&intel_menlow_memory_driver);
528         intel_menlow_unregister_sensor();
529 }
530 
531 module_init(intel_menlow_module_init);
532 module_exit(intel_menlow_module_exit);
533 

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