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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
40#include <linux/thermal.h>
41#include <acpi/acpi_bus.h>
42#include <acpi/acpi_drivers.h>
43
44MODULE_AUTHOR("Thomas Sujith");
45MODULE_AUTHOR("Zhang Rui");
46MODULE_DESCRIPTION("Intel Menlow platform specific driver");
47MODULE_LICENSE("GPL");
48
49/*
50 * Memory controller device control
51 */
52
53#define MEMORY_GET_BANDWIDTH "GTHS"
54#define MEMORY_SET_BANDWIDTH "STHS"
55#define MEMORY_ARG_CUR_BANDWIDTH 1
56#define MEMORY_ARG_MAX_BANDWIDTH 0
57
58static void intel_menlow_unregister_sensor(void);
59
60/*
61 * GTHS returning 'n' would mean that [0,n-1] states are supported
62 * In that case max_cstate would be n-1
63 * GTHS returning '0' would mean that no bandwidth control states are supported
64 */
65static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
66 unsigned long *max_state)
67{
68 struct acpi_device *device = cdev->devdata;
69 acpi_handle handle = device->handle;
70 unsigned long long value;
71 struct acpi_object_list arg_list;
72 union acpi_object arg;
73 acpi_status status = AE_OK;
74
75 arg_list.count = 1;
76 arg_list.pointer = &arg;
77 arg.type = ACPI_TYPE_INTEGER;
78 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
79 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
80 &arg_list, &value);
81 if (ACPI_FAILURE(status))
82 return -EFAULT;
83
84 if (!value)
85 return -EINVAL;
86
87 *max_state = value - 1;
88 return 0;
89}
90
91static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
92 unsigned long *value)
93{
94 struct acpi_device *device = cdev->devdata;
95 acpi_handle handle = device->handle;
96 unsigned long long result;
97 struct acpi_object_list arg_list;
98 union acpi_object arg;
99 acpi_status status = AE_OK;
100
101 arg_list.count = 1;
102 arg_list.pointer = &arg;
103 arg.type = ACPI_TYPE_INTEGER;
104 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
105 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
106 &arg_list, &result);
107 if (ACPI_FAILURE(status))
108 return -EFAULT;
109
110 *value = result;
111 return 0;
112}
113
114static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
115 unsigned long state)
116{
117 struct acpi_device *device = cdev->devdata;
118 acpi_handle handle = device->handle;
119 struct acpi_object_list arg_list;
120 union acpi_object arg;
121 acpi_status status;
122 unsigned long long temp;
123 unsigned long max_state;
124
125 if (memory_get_max_bandwidth(cdev, &max_state))
126 return -EFAULT;
127
128 if (state > max_state)
129 return -EINVAL;
130
131 arg_list.count = 1;
132 arg_list.pointer = &arg;
133 arg.type = ACPI_TYPE_INTEGER;
134 arg.integer.value = state;
135
136 status =
137 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
138 &temp);
139
140 pr_info("Bandwidth value was %ld: status is %d\n", state, status);
141 if (ACPI_FAILURE(status))
142 return -EFAULT;
143
144 return 0;
145}
146
147static struct thermal_cooling_device_ops memory_cooling_ops = {
148 .get_max_state = memory_get_max_bandwidth,
149 .get_cur_state = memory_get_cur_bandwidth,
150 .set_cur_state = memory_set_cur_bandwidth,
151};
152
153/*
154 * Memory Device Management
155 */
156static int intel_menlow_memory_add(struct acpi_device *device)
157{
158 int result = -ENODEV;
159 acpi_status status = AE_OK;
160 acpi_handle dummy;
161 struct thermal_cooling_device *cdev;
162
163 if (!device)
164 return -EINVAL;
165
166 status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
167 if (ACPI_FAILURE(status))
168 goto end;
169
170 status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
171 if (ACPI_FAILURE(status))
172 goto end;
173
174 cdev = thermal_cooling_device_register("Memory controller", device,
175 &memory_cooling_ops);
176 if (IS_ERR(cdev)) {
177 result = PTR_ERR(cdev);
178 goto end;
179 }
180
181 device->driver_data = cdev;
182 result = sysfs_create_link(&device->dev.kobj,
183 &cdev->device.kobj, "thermal_cooling");
184 if (result)
185 goto unregister;
186
187 result = sysfs_create_link(&cdev->device.kobj,
188 &device->dev.kobj, "device");
189 if (result) {
190 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
191 goto unregister;
192 }
193
194 end:
195 return result;
196
197 unregister:
198 thermal_cooling_device_unregister(cdev);
199 return result;
200
201}
202
203static int intel_menlow_memory_remove(struct acpi_device *device, int type)
204{
205 struct thermal_cooling_device *cdev = acpi_driver_data(device);
206
207 if (!device || !cdev)
208 return -EINVAL;
209
210 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
211 sysfs_remove_link(&cdev->device.kobj, "device");
212 thermal_cooling_device_unregister(cdev);
213
214 return 0;
215}
216
217static const struct acpi_device_id intel_menlow_memory_ids[] = {
218 {"INT0002", 0},
219 {"", 0},
220};
221
222static struct acpi_driver intel_menlow_memory_driver = {
223 .name = "intel_menlow_thermal_control",
224 .ids = intel_menlow_memory_ids,
225 .ops = {
226 .add = intel_menlow_memory_add,
227 .remove = intel_menlow_memory_remove,
228 },
229};
230
231/*
232 * Sensor control on menlow platform
233 */
234
235#define THERMAL_AUX0 0
236#define THERMAL_AUX1 1
237#define GET_AUX0 "GAX0"
238#define GET_AUX1 "GAX1"
239#define SET_AUX0 "SAX0"
240#define SET_AUX1 "SAX1"
241
242struct intel_menlow_attribute {
243 struct device_attribute attr;
244 struct device *device;
245 acpi_handle handle;
246 struct list_head node;
247};
248
249static LIST_HEAD(intel_menlow_attr_list);
250static DEFINE_MUTEX(intel_menlow_attr_lock);
251
252/*
253 * sensor_get_auxtrip - get the current auxtrip value from sensor
254 * @name: Thermalzone name
255 * @auxtype : AUX0/AUX1
256 * @buf: syfs buffer
257 */
258static int sensor_get_auxtrip(acpi_handle handle, int index,
259 unsigned long long *value)
260{
261 acpi_status status;
262
263 if ((index != 0 && index != 1) || !value)
264 return -EINVAL;
265
266 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
267 NULL, value);
268 if (ACPI_FAILURE(status))
269 return -EIO;
270
271 return 0;
272}
273
274/*
275 * sensor_set_auxtrip - set the new auxtrip value to sensor
276 * @name: Thermalzone name
277 * @auxtype : AUX0/AUX1
278 * @buf: syfs buffer
279 */
280static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
281{
282 acpi_status status;
283 union acpi_object arg = {
284 ACPI_TYPE_INTEGER
285 };
286 struct acpi_object_list args = {
287 1, &arg
288 };
289 unsigned long long temp;
290
291 if (index != 0 && index != 1)
292 return -EINVAL;
293
294 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
295 NULL, &temp);
296 if (ACPI_FAILURE(status))
297 return -EIO;
298 if ((index && value < temp) || (!index && value > temp))
299 return -EINVAL;
300
301 arg.integer.value = value;
302 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
303 &args, &temp);
304 if (ACPI_FAILURE(status))
305 return -EIO;
306
307 /* do we need to check the return value of SAX0/SAX1 ? */
308
309 return 0;
310}
311
312#define to_intel_menlow_attr(_attr) \
313 container_of(_attr, struct intel_menlow_attribute, attr)
314
315static ssize_t aux0_show(struct device *dev,
316 struct device_attribute *dev_attr, char *buf)
317{
318 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
319 unsigned long long value;
320 int result;
321
322 result = sensor_get_auxtrip(attr->handle, 0, &value);
323
324 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
325}
326
327static ssize_t aux1_show(struct device *dev,
328 struct device_attribute *dev_attr, char *buf)
329{
330 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
331 unsigned long long value;
332 int result;
333
334 result = sensor_get_auxtrip(attr->handle, 1, &value);
335
336 return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
337}
338
339static ssize_t aux0_store(struct device *dev,
340 struct device_attribute *dev_attr,
341 const char *buf, size_t count)
342{
343 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
344 int value;
345 int result;
346
347 /*Sanity check; should be a positive integer */
348 if (!sscanf(buf, "%d", &value))
349 return -EINVAL;
350
351 if (value < 0)
352 return -EINVAL;
353
354 result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
355 return result ? result : count;
356}
357
358static ssize_t aux1_store(struct device *dev,
359 struct device_attribute *dev_attr,
360 const char *buf, size_t count)
361{
362 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
363 int value;
364 int result;
365
366 /*Sanity check; should be a positive integer */
367 if (!sscanf(buf, "%d", &value))
368 return -EINVAL;
369
370 if (value < 0)
371 return -EINVAL;
372
373 result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
374 return result ? result : count;
375}
376
377/* BIOS can enable/disable the thermal user application in dabney platform */
378#define BIOS_ENABLED "\\_TZ.GSTS"
379static ssize_t bios_enabled_show(struct device *dev,
380 struct device_attribute *attr, char *buf)
381{
382 acpi_status status;
383 unsigned long long bios_enabled;
384
385 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
386 if (ACPI_FAILURE(status))
387 return -ENODEV;
388
389 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
390}
391
392static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
393 void *store, struct device *dev,
394 acpi_handle handle)
395{
396 struct intel_menlow_attribute *attr;
397 int result;
398
399 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
400 if (!attr)
401 return -ENOMEM;
402
403 sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
404 attr->attr.attr.name = name;
405 attr->attr.attr.mode = mode;
406 attr->attr.show = show;
407 attr->attr.store = store;
408 attr->device = dev;
409 attr->handle = handle;
410
411 result = device_create_file(dev, &attr->attr);
412 if (result) {
413 kfree(attr);
414 return result;
415 }
416
417 mutex_lock(&intel_menlow_attr_lock);
418 list_add_tail(&attr->node, &intel_menlow_attr_list);
419 mutex_unlock(&intel_menlow_attr_lock);
420
421 return 0;
422}
423
424static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
425 void *context, void **rv)
426{
427 acpi_status status;
428 acpi_handle dummy;
429 struct thermal_zone_device *thermal;
430 int result;
431
432 result = acpi_bus_get_private_data(handle, (void **)&thermal);
433 if (result)
434 return 0;
435
436 /* _TZ must have the AUX0/1 methods */
437 status = acpi_get_handle(handle, GET_AUX0, &dummy);
438 if (ACPI_FAILURE(status))
439 return (status == AE_NOT_FOUND) ? AE_OK : status;
440
441 status = acpi_get_handle(handle, SET_AUX0, &dummy);
442 if (ACPI_FAILURE(status))
443 return (status == AE_NOT_FOUND) ? AE_OK : status;
444
445 result = intel_menlow_add_one_attribute("aux0", 0644,
446 aux0_show, aux0_store,
447 &thermal->device, handle);
448 if (result)
449 return AE_ERROR;
450
451 status = acpi_get_handle(handle, GET_AUX1, &dummy);
452 if (ACPI_FAILURE(status))
453 goto aux1_not_found;
454
455 status = acpi_get_handle(handle, SET_AUX1, &dummy);
456 if (ACPI_FAILURE(status))
457 goto aux1_not_found;
458
459 result = intel_menlow_add_one_attribute("aux1", 0644,
460 aux1_show, aux1_store,
461 &thermal->device, handle);
462 if (result) {
463 intel_menlow_unregister_sensor();
464 return AE_ERROR;
465 }
466
467 /*
468 * create the "dabney_enabled" attribute which means the user app
469 * should be loaded or not
470 */
471
472 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
473 bios_enabled_show, NULL,
474 &thermal->device, handle);
475 if (result) {
476 intel_menlow_unregister_sensor();
477 return AE_ERROR;
478 }
479
480 return AE_OK;
481
482 aux1_not_found:
483 if (status == AE_NOT_FOUND)
484 return AE_OK;
485
486 intel_menlow_unregister_sensor();
487 return status;
488}
489
490static void intel_menlow_unregister_sensor(void)
491{
492 struct intel_menlow_attribute *pos, *next;
493
494 mutex_lock(&intel_menlow_attr_lock);
495 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
496 list_del(&pos->node);
497 device_remove_file(pos->device, &pos->attr);
498 kfree(pos);
499 }
500 mutex_unlock(&intel_menlow_attr_lock);
501
502 return;
503}
504
505static int __init intel_menlow_module_init(void)
506{
507 int result = -ENODEV;
508 acpi_status status;
509 unsigned long long enable;
510
511 if (acpi_disabled)
512 return result;
513
514 /* Looking for the \_TZ.GSTS method */
515 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
516 if (ACPI_FAILURE(status) || !enable)
517 return -ENODEV;
518
519 /* Looking for ACPI device MEM0 with hardware id INT0002 */
520 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
521 if (result)
522 return result;
523
524 /* Looking for sensors in each ACPI thermal zone */
525 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
526 ACPI_UINT32_MAX,
527 intel_menlow_register_sensor, NULL, NULL, NULL);
528 if (ACPI_FAILURE(status)) {
529 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
530 return -ENODEV;
531 }
532
533 return 0;
534}
535
536static void __exit intel_menlow_module_exit(void)
537{
538 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
539 intel_menlow_unregister_sensor();
540}
541
542module_init(intel_menlow_module_init);
543module_exit(intel_menlow_module_exit);
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
42MODULE_AUTHOR("Thomas Sujith");
43MODULE_AUTHOR("Zhang Rui");
44MODULE_DESCRIPTION("Intel Menlow platform specific driver");
45MODULE_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
56static 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 '0' would mean that no bandwidth control states are supported
62 */
63static 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
89static 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
112static 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
145static const 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 */
154static 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
197static 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
211static const struct acpi_device_id intel_menlow_memory_ids[] = {
212 {"INT0002", 0},
213 {"", 0},
214};
215
216static 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
236struct intel_menlow_attribute {
237 struct device_attribute attr;
238 struct device *device;
239 acpi_handle handle;
240 struct list_head node;
241};
242
243static LIST_HEAD(intel_menlow_attr_list);
244static 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 */
252static 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 */
274static 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
309static 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
321static 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
327static 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
333static 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
352static 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
359static 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"
368static 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
381static 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
413static 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
479static 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
494static 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
525static void __exit intel_menlow_module_exit(void)
526{
527 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
528 intel_menlow_unregister_sensor();
529}
530
531module_init(intel_menlow_module_init);
532module_exit(intel_menlow_module_exit);