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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#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 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 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", DECI_KELVIN_TO_CELSIUS(value));
319}
320
321static 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", DECI_KELVIN_TO_CELSIUS(value));
331}
332
333static 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_DECI_KELVIN(value));
349 return result ? result : count;
350}
351
352static 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_DECI_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"
373static 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
386static 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
418static 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
484static 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
499static 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
530static void __exit intel_menlow_module_exit(void)
531{
532 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
533 intel_menlow_unregister_sensor();
534}
535
536module_init(intel_menlow_module_init);
537module_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);