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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * Intel menlow Driver for thermal management extension
4 *
5 * Copyright (C) 2008 Intel Corp
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
8 *
9 * This driver creates the sys I/F for programming the sensors.
10 * It also implements the driver for intel menlow memory controller (hardware
11 * id is INT0002) which makes use of the platform specific ACPI methods
12 * to get/set bandwidth.
13 */
14
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
26MODULE_AUTHOR("Thomas Sujith");
27MODULE_AUTHOR("Zhang Rui");
28MODULE_DESCRIPTION("Intel Menlow platform specific driver");
29MODULE_LICENSE("GPL v2");
30
31/*
32 * Memory controller device control
33 */
34
35#define MEMORY_GET_BANDWIDTH "GTHS"
36#define MEMORY_SET_BANDWIDTH "STHS"
37#define MEMORY_ARG_CUR_BANDWIDTH 1
38#define MEMORY_ARG_MAX_BANDWIDTH 0
39
40static void intel_menlow_unregister_sensor(void);
41
42/*
43 * GTHS returning 'n' would mean that [0,n-1] states are supported
44 * In that case max_cstate would be n-1
45 * GTHS returning '0' would mean that no bandwidth control states are supported
46 */
47static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
48 unsigned long *max_state)
49{
50 struct acpi_device *device = cdev->devdata;
51 acpi_handle handle = device->handle;
52 unsigned long long value;
53 struct acpi_object_list arg_list;
54 union acpi_object arg;
55 acpi_status status = AE_OK;
56
57 arg_list.count = 1;
58 arg_list.pointer = &arg;
59 arg.type = ACPI_TYPE_INTEGER;
60 arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
61 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
62 &arg_list, &value);
63 if (ACPI_FAILURE(status))
64 return -EFAULT;
65
66 if (!value)
67 return -EINVAL;
68
69 *max_state = value - 1;
70 return 0;
71}
72
73static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
74 unsigned long *value)
75{
76 struct acpi_device *device = cdev->devdata;
77 acpi_handle handle = device->handle;
78 unsigned long long result;
79 struct acpi_object_list arg_list;
80 union acpi_object arg;
81 acpi_status status = AE_OK;
82
83 arg_list.count = 1;
84 arg_list.pointer = &arg;
85 arg.type = ACPI_TYPE_INTEGER;
86 arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
87 status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
88 &arg_list, &result);
89 if (ACPI_FAILURE(status))
90 return -EFAULT;
91
92 *value = result;
93 return 0;
94}
95
96static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
97 unsigned long state)
98{
99 struct acpi_device *device = cdev->devdata;
100 acpi_handle handle = device->handle;
101 struct acpi_object_list arg_list;
102 union acpi_object arg;
103 acpi_status status;
104 unsigned long long temp;
105 unsigned long max_state;
106
107 if (memory_get_max_bandwidth(cdev, &max_state))
108 return -EFAULT;
109
110 if (state > max_state)
111 return -EINVAL;
112
113 arg_list.count = 1;
114 arg_list.pointer = &arg;
115 arg.type = ACPI_TYPE_INTEGER;
116 arg.integer.value = state;
117
118 status =
119 acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
120 &temp);
121
122 pr_info("Bandwidth value was %ld: status is %d\n", state, status);
123 if (ACPI_FAILURE(status))
124 return -EFAULT;
125
126 return 0;
127}
128
129static const struct thermal_cooling_device_ops memory_cooling_ops = {
130 .get_max_state = memory_get_max_bandwidth,
131 .get_cur_state = memory_get_cur_bandwidth,
132 .set_cur_state = memory_set_cur_bandwidth,
133};
134
135/*
136 * Memory Device Management
137 */
138static int intel_menlow_memory_add(struct acpi_device *device)
139{
140 int result = -ENODEV;
141 struct thermal_cooling_device *cdev;
142
143 if (!device)
144 return -EINVAL;
145
146 if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
147 goto end;
148
149 if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
150 goto end;
151
152 cdev = thermal_cooling_device_register("Memory controller", device,
153 &memory_cooling_ops);
154 if (IS_ERR(cdev)) {
155 result = PTR_ERR(cdev);
156 goto end;
157 }
158
159 device->driver_data = cdev;
160 result = sysfs_create_link(&device->dev.kobj,
161 &cdev->device.kobj, "thermal_cooling");
162 if (result)
163 goto unregister;
164
165 result = sysfs_create_link(&cdev->device.kobj,
166 &device->dev.kobj, "device");
167 if (result) {
168 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
169 goto unregister;
170 }
171
172 end:
173 return result;
174
175 unregister:
176 thermal_cooling_device_unregister(cdev);
177 return result;
178
179}
180
181static int intel_menlow_memory_remove(struct acpi_device *device)
182{
183 struct thermal_cooling_device *cdev;
184
185 if (!device)
186 return -EINVAL;
187
188 cdev = acpi_driver_data(device);
189 if (!cdev)
190 return -EINVAL;
191
192 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
193 sysfs_remove_link(&cdev->device.kobj, "device");
194 thermal_cooling_device_unregister(cdev);
195
196 return 0;
197}
198
199static const struct acpi_device_id intel_menlow_memory_ids[] = {
200 {"INT0002", 0},
201 {"", 0},
202};
203
204static struct acpi_driver intel_menlow_memory_driver = {
205 .name = "intel_menlow_thermal_control",
206 .ids = intel_menlow_memory_ids,
207 .ops = {
208 .add = intel_menlow_memory_add,
209 .remove = intel_menlow_memory_remove,
210 },
211};
212
213/*
214 * Sensor control on menlow platform
215 */
216
217#define THERMAL_AUX0 0
218#define THERMAL_AUX1 1
219#define GET_AUX0 "GAX0"
220#define GET_AUX1 "GAX1"
221#define SET_AUX0 "SAX0"
222#define SET_AUX1 "SAX1"
223
224struct intel_menlow_attribute {
225 struct device_attribute attr;
226 struct device *device;
227 acpi_handle handle;
228 struct list_head node;
229};
230
231static LIST_HEAD(intel_menlow_attr_list);
232static DEFINE_MUTEX(intel_menlow_attr_lock);
233
234/*
235 * sensor_get_auxtrip - get the current auxtrip value from sensor
236 * @name: Thermalzone name
237 * @auxtype : AUX0/AUX1
238 * @buf: syfs buffer
239 */
240static int sensor_get_auxtrip(acpi_handle handle, int index,
241 unsigned long long *value)
242{
243 acpi_status status;
244
245 if ((index != 0 && index != 1) || !value)
246 return -EINVAL;
247
248 status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
249 NULL, value);
250 if (ACPI_FAILURE(status))
251 return -EIO;
252
253 return 0;
254}
255
256/*
257 * sensor_set_auxtrip - set the new auxtrip value to sensor
258 * @name: Thermalzone name
259 * @auxtype : AUX0/AUX1
260 * @buf: syfs buffer
261 */
262static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
263{
264 acpi_status status;
265 union acpi_object arg = {
266 ACPI_TYPE_INTEGER
267 };
268 struct acpi_object_list args = {
269 1, &arg
270 };
271 unsigned long long temp;
272
273 if (index != 0 && index != 1)
274 return -EINVAL;
275
276 status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
277 NULL, &temp);
278 if (ACPI_FAILURE(status))
279 return -EIO;
280 if ((index && value < temp) || (!index && value > temp))
281 return -EINVAL;
282
283 arg.integer.value = value;
284 status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
285 &args, &temp);
286 if (ACPI_FAILURE(status))
287 return -EIO;
288
289 /* do we need to check the return value of SAX0/SAX1 ? */
290
291 return 0;
292}
293
294#define to_intel_menlow_attr(_attr) \
295 container_of(_attr, struct intel_menlow_attribute, attr)
296
297static ssize_t aux_show(struct device *dev, struct device_attribute *dev_attr,
298 char *buf, int idx)
299{
300 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
301 unsigned long long value;
302 int result;
303
304 result = sensor_get_auxtrip(attr->handle, idx, &value);
305
306 return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value));
307}
308
309static ssize_t aux0_show(struct device *dev,
310 struct device_attribute *dev_attr, char *buf)
311{
312 return aux_show(dev, dev_attr, buf, 0);
313}
314
315static ssize_t aux1_show(struct device *dev,
316 struct device_attribute *dev_attr, char *buf)
317{
318 return aux_show(dev, dev_attr, buf, 1);
319}
320
321static ssize_t aux_store(struct device *dev, struct device_attribute *dev_attr,
322 const char *buf, size_t count, int idx)
323{
324 struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
325 int value;
326 int result;
327
328 /*Sanity check; should be a positive integer */
329 if (!sscanf(buf, "%d", &value))
330 return -EINVAL;
331
332 if (value < 0)
333 return -EINVAL;
334
335 result = sensor_set_auxtrip(attr->handle, idx,
336 CELSIUS_TO_DECI_KELVIN(value));
337 return result ? result : count;
338}
339
340static ssize_t aux0_store(struct device *dev,
341 struct device_attribute *dev_attr,
342 const char *buf, size_t count)
343{
344 return aux_store(dev, dev_attr, buf, count, 0);
345}
346
347static ssize_t aux1_store(struct device *dev,
348 struct device_attribute *dev_attr,
349 const char *buf, size_t count)
350{
351 return aux_store(dev, dev_attr, buf, count, 1);
352}
353
354/* BIOS can enable/disable the thermal user application in dabney platform */
355#define BIOS_ENABLED "\\_TZ.GSTS"
356static ssize_t bios_enabled_show(struct device *dev,
357 struct device_attribute *attr, char *buf)
358{
359 acpi_status status;
360 unsigned long long bios_enabled;
361
362 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
363 if (ACPI_FAILURE(status))
364 return -ENODEV;
365
366 return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
367}
368
369static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
370 void *store, struct device *dev,
371 acpi_handle handle)
372{
373 struct intel_menlow_attribute *attr;
374 int result;
375
376 attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
377 if (!attr)
378 return -ENOMEM;
379
380 sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
381 attr->attr.attr.name = name;
382 attr->attr.attr.mode = mode;
383 attr->attr.show = show;
384 attr->attr.store = store;
385 attr->device = dev;
386 attr->handle = handle;
387
388 result = device_create_file(dev, &attr->attr);
389 if (result) {
390 kfree(attr);
391 return result;
392 }
393
394 mutex_lock(&intel_menlow_attr_lock);
395 list_add_tail(&attr->node, &intel_menlow_attr_list);
396 mutex_unlock(&intel_menlow_attr_lock);
397
398 return 0;
399}
400
401static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
402 void *context, void **rv)
403{
404 acpi_status status;
405 acpi_handle dummy;
406 struct thermal_zone_device *thermal;
407 int result;
408
409 result = acpi_bus_get_private_data(handle, (void **)&thermal);
410 if (result)
411 return 0;
412
413 /* _TZ must have the AUX0/1 methods */
414 status = acpi_get_handle(handle, GET_AUX0, &dummy);
415 if (ACPI_FAILURE(status))
416 return (status == AE_NOT_FOUND) ? AE_OK : status;
417
418 status = acpi_get_handle(handle, SET_AUX0, &dummy);
419 if (ACPI_FAILURE(status))
420 return (status == AE_NOT_FOUND) ? AE_OK : status;
421
422 result = intel_menlow_add_one_attribute("aux0", 0644,
423 aux0_show, aux0_store,
424 &thermal->device, handle);
425 if (result)
426 return AE_ERROR;
427
428 status = acpi_get_handle(handle, GET_AUX1, &dummy);
429 if (ACPI_FAILURE(status))
430 goto aux1_not_found;
431
432 status = acpi_get_handle(handle, SET_AUX1, &dummy);
433 if (ACPI_FAILURE(status))
434 goto aux1_not_found;
435
436 result = intel_menlow_add_one_attribute("aux1", 0644,
437 aux1_show, aux1_store,
438 &thermal->device, handle);
439 if (result) {
440 intel_menlow_unregister_sensor();
441 return AE_ERROR;
442 }
443
444 /*
445 * create the "dabney_enabled" attribute which means the user app
446 * should be loaded or not
447 */
448
449 result = intel_menlow_add_one_attribute("bios_enabled", 0444,
450 bios_enabled_show, NULL,
451 &thermal->device, handle);
452 if (result) {
453 intel_menlow_unregister_sensor();
454 return AE_ERROR;
455 }
456
457 return AE_OK;
458
459 aux1_not_found:
460 if (status == AE_NOT_FOUND)
461 return AE_OK;
462
463 intel_menlow_unregister_sensor();
464 return status;
465}
466
467static void intel_menlow_unregister_sensor(void)
468{
469 struct intel_menlow_attribute *pos, *next;
470
471 mutex_lock(&intel_menlow_attr_lock);
472 list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
473 list_del(&pos->node);
474 device_remove_file(pos->device, &pos->attr);
475 kfree(pos);
476 }
477 mutex_unlock(&intel_menlow_attr_lock);
478
479 return;
480}
481
482static int __init intel_menlow_module_init(void)
483{
484 int result = -ENODEV;
485 acpi_status status;
486 unsigned long long enable;
487
488 if (acpi_disabled)
489 return result;
490
491 /* Looking for the \_TZ.GSTS method */
492 status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
493 if (ACPI_FAILURE(status) || !enable)
494 return -ENODEV;
495
496 /* Looking for ACPI device MEM0 with hardware id INT0002 */
497 result = acpi_bus_register_driver(&intel_menlow_memory_driver);
498 if (result)
499 return result;
500
501 /* Looking for sensors in each ACPI thermal zone */
502 status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
503 ACPI_UINT32_MAX,
504 intel_menlow_register_sensor, NULL, NULL, NULL);
505 if (ACPI_FAILURE(status)) {
506 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
507 return -ENODEV;
508 }
509
510 return 0;
511}
512
513static void __exit intel_menlow_module_exit(void)
514{
515 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
516 intel_menlow_unregister_sensor();
517}
518
519module_init(intel_menlow_module_init);
520module_exit(intel_menlow_module_exit);