aboutsummaryrefslogtreecommitdiff
path: root/drivers/platform/x86/intel_menlow.c
blob: 1190bad4297fb06d796153a0df77661b40b63090 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
/*
 *  intel_menlow.c - Intel menlow Driver for thermal management extension
 *
 *  Copyright (C) 2008 Intel Corp
 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This driver creates the sys I/F for programming the sensors.
 *  It also implements the driver for intel menlow memory controller (hardware
 *  id is INT0002) which makes use of the platform specific ACPI methods
 *  to get/set bandwidth.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pm.h>

#include <linux/thermal.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

MODULE_AUTHOR("Thomas Sujith");
MODULE_AUTHOR("Zhang Rui");
MODULE_DESCRIPTION("Intel Menlow platform specific driver");
MODULE_LICENSE("GPL");

/*
 * Memory controller device control
 */

#define MEMORY_GET_BANDWIDTH "GTHS"
#define MEMORY_SET_BANDWIDTH "STHS"
#define MEMORY_ARG_CUR_BANDWIDTH 1
#define MEMORY_ARG_MAX_BANDWIDTH 0

/*
 * GTHS returning 'n' would mean that [0,n-1] states are supported
 * In that case max_cstate would be n-1
 * GTHS returning '0' would mean that no bandwidth control states are supported
 */
static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
				    unsigned long *max_state)
{
	struct acpi_device *device = cdev->devdata;
	acpi_handle handle = device->handle;
	unsigned long long value;
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status = AE_OK;

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
				       &arg_list, &value);
	if (ACPI_FAILURE(status))
		return -EFAULT;

	if (!value)
		return -EINVAL;

	*max_state = value - 1;
	return 0;
}

static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
				    unsigned long *value)
{
	struct acpi_device *device = cdev->devdata;
	acpi_handle handle = device->handle;
	unsigned long long result;
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status = AE_OK;

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
	status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
				       &arg_list, &result);
	if (ACPI_FAILURE(status))
		return -EFAULT;

	*value = result;
	return 0;
}

static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
				    unsigned long state)
{
	struct acpi_device *device = cdev->devdata;
	acpi_handle handle = device->handle;
	struct acpi_object_list arg_list;
	union acpi_object arg;
	acpi_status status;
	unsigned long long temp;
	unsigned long max_state;

	if (memory_get_max_bandwidth(cdev, &max_state))
		return -EFAULT;

	if (state > max_state)
		return -EINVAL;

	arg_list.count = 1;
	arg_list.pointer = &arg;
	arg.type = ACPI_TYPE_INTEGER;
	arg.integer.value = state;

	status =
	    acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
				  &temp);

	printk(KERN_INFO
	       "Bandwidth value was %ld: status is %d\n", state, status);
	if (ACPI_FAILURE(status))
		return -EFAULT;

	return 0;
}

static struct thermal_cooling_device_ops memory_cooling_ops = {
	.get_max_state = memory_get_max_bandwidth,
	.get_cur_state = memory_get_cur_bandwidth,
	.set_cur_state = memory_set_cur_bandwidth,
};

/*
 * Memory Device Management
 */
static int intel_menlow_memory_add(struct acpi_device *device)
{
	int result = -ENODEV;
	acpi_status status = AE_OK;
	acpi_handle dummy;
	struct thermal_cooling_device *cdev;

	if (!device)
		return -EINVAL;

	status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
	if (ACPI_FAILURE(status))
		goto end;

	status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
	if (ACPI_FAILURE(status))
		goto end;

	cdev = thermal_cooling_device_register("Memory controller", device,
					       &memory_cooling_ops);
	if (IS_ERR(cdev)) {
		result = PTR_ERR(cdev);
		goto end;
	}

	device->driver_data = cdev;
	result = sysfs_create_link(&device->dev.kobj,
				&cdev->device.kobj, "thermal_cooling");
	if (result)
		goto unregister;

	result = sysfs_create_link(&cdev->device.kobj,
				&device->dev.kobj, "device");
	if (result) {
		sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
		goto unregister;
	}

 end:
	return result;

 unregister:
	thermal_cooling_device_unregister(cdev);
	return result;

}

static int intel_menlow_memory_remove(struct acpi_device *device, int type)
{
	struct thermal_cooling_device *cdev = acpi_driver_data(device);

	if (!device || !cdev)
		return -EINVAL;

	sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
	sysfs_remove_link(&cdev->device.kobj, "device");
	thermal_cooling_device_unregister(cdev);

	return 0;
}

static const struct acpi_device_id intel_menlow_memory_ids[] = {
	{"INT0002", 0},
	{"", 0},
};

static struct acpi_driver intel_menlow_memory_driver = {
	.name = "intel_menlow_thermal_control",
	.ids = intel_menlow_memory_ids,
	.ops = {
		.add = intel_menlow_memory_add,
		.remove = intel_menlow_memory_remove,
		},
};

/*
 * Sensor control on menlow platform
 */

#define THERMAL_AUX0 0
#define THERMAL_AUX1 1
#define GET_AUX0 "GAX0"
#define GET_AUX1 "GAX1"
#define SET_AUX0 "SAX0"
#define SET_AUX1 "SAX1"

struct intel_menlow_attribute {
	struct device_attribute attr;
	struct device *device;
	acpi_handle handle;
	struct list_head node;
};

static LIST_HEAD(intel_menlow_attr_list);
static DEFINE_MUTEX(intel_menlow_attr_lock);

/*
 * sensor_get_auxtrip - get the current auxtrip value from sensor
 * @name: Thermalzone name
 * @auxtype : AUX0/AUX1
 * @buf: syfs buffer
 */
static int sensor_get_auxtrip(acpi_handle handle, int index,
							unsigned long long *value)
{
	acpi_status status;

	if ((index != 0 && index != 1) || !value)
		return -EINVAL;

	status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
				       NULL, value);
	if (ACPI_FAILURE(status))
		return -EIO;

	return 0;
}

/*
 * sensor_set_auxtrip - set the new auxtrip value to sensor
 * @name: Thermalzone name
 * @auxtype : AUX0/AUX1
 * @buf: syfs buffer
 */
static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
{
	acpi_status status;
	union acpi_object arg = {
		ACPI_TYPE_INTEGER
	};
	struct acpi_object_list args = {
		1, &arg
	};
	unsigned long long temp;

	if (index != 0 && index != 1)
		return -EINVAL;

	status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
				       NULL, &temp);
	if (ACPI_FAILURE(status))
		return -EIO;
	if ((index && value < temp) || (!index && value > temp))
		return -EINVAL;

	arg.integer.value = value;
	status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
				       &args, &temp);
	if (ACPI_FAILURE(status))
		return -EIO;

	/* do we need to check the return value of SAX0/SAX1 ? */

	return 0;
}

#define to_intel_menlow_attr(_attr)	\
	container_of(_attr, struct intel_menlow_attribute, attr)

static ssize_t aux0_show(struct device *dev,
			 struct device_attribute *dev_attr, char *buf)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	unsigned long long value;
	int result;

	result = sensor_get_auxtrip(attr->handle, 0, &value);

	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
}

static ssize_t aux1_show(struct device *dev,
			 struct device_attribute *dev_attr, char *buf)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	unsigned long long value;
	int result;

	result = sensor_get_auxtrip(attr->handle, 1, &value);

	return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
}

static ssize_t aux0_store(struct device *dev,
			  struct device_attribute *dev_attr,
			  const char *buf, size_t count)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	int value;
	int result;

	/*Sanity check; should be a positive integer */
	if (!sscanf(buf, "%d", &value))
		return -EINVAL;

	if (value < 0)
		return -EINVAL;

	result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
	return result ? result : count;
}

static ssize_t aux1_store(struct device *dev,
			  struct device_attribute *dev_attr,
			  const char *buf, size_t count)
{
	struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
	int value;
	int result;

	/*Sanity check; should be a positive integer */
	if (!sscanf(buf, "%d", &value))
		return -EINVAL;

	if (value < 0)
		return -EINVAL;

	result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
	return result ? result : count;
}

/* BIOS can enable/disable the thermal user application in dabney platform */
#define BIOS_ENABLED "\\_TZ.GSTS"
static ssize_t bios_enabled_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	acpi_status status;
	unsigned long long bios_enabled;

	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
}

static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
					  void *store, struct device *dev,
					  acpi_handle handle)
{
	struct intel_menlow_attribute *attr;
	int result;

	attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
	if (!attr)
		return -ENOMEM;

	attr->attr.attr.name = name;
	attr->attr.attr.mode = mode;
	attr->attr.show = show;
	attr->attr.store = store;
	attr->device = dev;
	attr->handle = handle;

	result = device_create_file(dev, &attr->attr);
	if (result)
		return result;

	mutex_lock(&intel_menlow_attr_lock);
	list_add_tail(&attr->node, &intel_menlow_attr_list);
	mutex_unlock(&intel_menlow_attr_lock);

	return 0;
}

static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
						void *context, void **rv)
{
	acpi_status status;
	acpi_handle dummy;
	struct thermal_zone_device *thermal;
	int result;

	result = acpi_bus_get_private_data(handle, (void **)&thermal);
	if (result)
		return 0;

	/* _TZ must have the AUX0/1 methods */
	status = acpi_get_handle(handle, GET_AUX0, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	status = acpi_get_handle(handle, SET_AUX0, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	result = intel_menlow_add_one_attribute("aux0", 0644,
						aux0_show, aux0_store,
						&thermal->device, handle);
	if (result)
		return AE_ERROR;

	status = acpi_get_handle(handle, GET_AUX1, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	status = acpi_get_handle(handle, SET_AUX1, &dummy);
	if (ACPI_FAILURE(status))
		goto not_found;

	result = intel_menlow_add_one_attribute("aux1", 0644,
						aux1_show, aux1_store,
						&thermal->device, handle);
	if (result)
		return AE_ERROR;

	/*
	 * create the "dabney_enabled" attribute which means the user app
	 * should be loaded or not
	 */

	result = intel_menlow_add_one_attribute("bios_enabled", 0444,
						bios_enabled_show, NULL,
						&thermal->device, handle);
	if (result)
		return AE_ERROR;

 not_found:
	if (status == AE_NOT_FOUND)
		return AE_OK;
	else
		return status;
}

static void intel_menlow_unregister_sensor(void)
{
	struct intel_menlow_attribute *pos, *next;

	mutex_lock(&intel_menlow_attr_lock);
	list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
		list_del(&pos->node);
		device_remove_file(pos->device, &pos->attr);
		kfree(pos);
	}
	mutex_unlock(&intel_menlow_attr_lock);

	return;
}

static int __init intel_menlow_module_init(void)
{
	int result = -ENODEV;
	acpi_status status;
	unsigned long long enable;

	if (acpi_disabled)
		return result;

	/* Looking for the \_TZ.GSTS method */
	status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
	if (ACPI_FAILURE(status) || !enable)
		return -ENODEV;

	/* Looking for ACPI device MEM0 with hardware id INT0002 */
	result = acpi_bus_register_driver(&intel_menlow_memory_driver);
	if (result)
		return result;

	/* Looking for sensors in each ACPI thermal zone */
	status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
				     ACPI_UINT32_MAX,
				     intel_menlow_register_sensor, NULL, NULL, NULL);
	if (ACPI_FAILURE(status))
		return -ENODEV;

	return 0;
}

static void __exit intel_menlow_module_exit(void)
{
	acpi_bus_unregister_driver(&intel_menlow_memory_driver);
	intel_menlow_unregister_sensor();
}

module_init(intel_menlow_module_init);
module_exit(intel_menlow_module_exit);