thermal.c 32.9 KB
Newer Older
L
Linus Torvalds 已提交
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
/*
 *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@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; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  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 fully implements the ACPI thermal policy as described in the
 *  ACPI 2.0 Specification.
 *
 *  TBD: 1. Implement passive cooling hysteresis.
 *       2. Enhance passive cooling (CPU) states/limit interface to support
 *          concepts of 'multiple limiters', upper/lower limits, etc.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
39 40
#include <linux/timer.h>
#include <linux/jiffies.h>
L
Linus Torvalds 已提交
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
#include <linux/kmod.h>
#include <linux/seq_file.h>
#include <asm/uaccess.h>

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

#define ACPI_THERMAL_COMPONENT		0x04000000
#define ACPI_THERMAL_CLASS		"thermal_zone"
#define ACPI_THERMAL_DEVICE_NAME	"Thermal Zone"
#define ACPI_THERMAL_FILE_STATE		"state"
#define ACPI_THERMAL_FILE_TEMPERATURE	"temperature"
#define ACPI_THERMAL_FILE_TRIP_POINTS	"trip_points"
#define ACPI_THERMAL_FILE_COOLING_MODE	"cooling_mode"
#define ACPI_THERMAL_FILE_POLLING_FREQ	"polling_frequency"
#define ACPI_THERMAL_NOTIFY_TEMPERATURE	0x80
#define ACPI_THERMAL_NOTIFY_THRESHOLDS	0x81
#define ACPI_THERMAL_NOTIFY_DEVICES	0x82
#define ACPI_THERMAL_NOTIFY_CRITICAL	0xF0
#define ACPI_THERMAL_NOTIFY_HOT		0xF1
#define ACPI_THERMAL_MODE_ACTIVE	0x00
#define ACPI_THERMAL_PATH_POWEROFF	"/sbin/poweroff"

#define ACPI_THERMAL_MAX_ACTIVE	10
#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65

#define KELVIN_TO_CELSIUS(t)    (long)(((long)t-2732>=0) ? ((long)t-2732+5)/10 : ((long)t-2732-5)/10)
#define CELSIUS_TO_KELVIN(t)	((t+273)*10)

#define _COMPONENT		ACPI_THERMAL_COMPONENT
71
ACPI_MODULE_NAME("thermal");
L
Linus Torvalds 已提交
72

73
MODULE_AUTHOR("Paul Diefenbaugh");
74
MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
L
Linus Torvalds 已提交
75 76 77 78 79 80
MODULE_LICENSE("GPL");

static int tzp;
module_param(tzp, int, 0);
MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.\n");

L
Len Brown 已提交
81 82
static int acpi_thermal_add(struct acpi_device *device);
static int acpi_thermal_remove(struct acpi_device *device, int type);
83
static int acpi_thermal_resume(struct acpi_device *device);
L
Linus Torvalds 已提交
84 85 86 87
static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file);
static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file);
static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file);
static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file);
L
Len Brown 已提交
88 89 90
static ssize_t acpi_thermal_write_cooling_mode(struct file *,
					       const char __user *, size_t,
					       loff_t *);
L
Linus Torvalds 已提交
91
static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file);
L
Len Brown 已提交
92 93
static ssize_t acpi_thermal_write_polling(struct file *, const char __user *,
					  size_t, loff_t *);
L
Linus Torvalds 已提交
94 95

static struct acpi_driver acpi_thermal_driver = {
L
Len Brown 已提交
96
	.name = "thermal",
L
Len Brown 已提交
97 98 99 100 101
	.class = ACPI_THERMAL_CLASS,
	.ids = ACPI_THERMAL_HID,
	.ops = {
		.add = acpi_thermal_add,
		.remove = acpi_thermal_remove,
102
		.resume = acpi_thermal_resume,
L
Len Brown 已提交
103
		},
L
Linus Torvalds 已提交
104 105 106
};

struct acpi_thermal_state {
L
Len Brown 已提交
107 108 109 110 111 112
	u8 critical:1;
	u8 hot:1;
	u8 passive:1;
	u8 active:1;
	u8 reserved:4;
	int active_index;
L
Linus Torvalds 已提交
113 114 115
};

struct acpi_thermal_state_flags {
L
Len Brown 已提交
116 117 118
	u8 valid:1;
	u8 enabled:1;
	u8 reserved:6;
L
Linus Torvalds 已提交
119 120 121 122
};

struct acpi_thermal_critical {
	struct acpi_thermal_state_flags flags;
L
Len Brown 已提交
123
	unsigned long temperature;
L
Linus Torvalds 已提交
124 125 126 127
};

struct acpi_thermal_hot {
	struct acpi_thermal_state_flags flags;
L
Len Brown 已提交
128
	unsigned long temperature;
L
Linus Torvalds 已提交
129 130 131 132
};

struct acpi_thermal_passive {
	struct acpi_thermal_state_flags flags;
L
Len Brown 已提交
133 134 135 136 137
	unsigned long temperature;
	unsigned long tc1;
	unsigned long tc2;
	unsigned long tsp;
	struct acpi_handle_list devices;
L
Linus Torvalds 已提交
138 139 140 141
};

struct acpi_thermal_active {
	struct acpi_thermal_state_flags flags;
L
Len Brown 已提交
142 143
	unsigned long temperature;
	struct acpi_handle_list devices;
L
Linus Torvalds 已提交
144 145 146 147
};

struct acpi_thermal_trips {
	struct acpi_thermal_critical critical;
L
Len Brown 已提交
148
	struct acpi_thermal_hot hot;
L
Linus Torvalds 已提交
149 150 151 152 153
	struct acpi_thermal_passive passive;
	struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
};

struct acpi_thermal_flags {
L
Len Brown 已提交
154 155 156
	u8 cooling_mode:1;	/* _SCP */
	u8 devices:1;		/* _TZD */
	u8 reserved:6;
L
Linus Torvalds 已提交
157 158 159
};

struct acpi_thermal {
160
	struct acpi_device * device;
L
Len Brown 已提交
161 162 163 164 165
	acpi_bus_id name;
	unsigned long temperature;
	unsigned long last_temperature;
	unsigned long polling_frequency;
	volatile u8 zombie;
L
Linus Torvalds 已提交
166 167 168
	struct acpi_thermal_flags flags;
	struct acpi_thermal_state state;
	struct acpi_thermal_trips trips;
L
Len Brown 已提交
169 170
	struct acpi_handle_list devices;
	struct timer_list timer;
L
Linus Torvalds 已提交
171 172
};

173
static const struct file_operations acpi_thermal_state_fops = {
L
Len Brown 已提交
174 175 176 177
	.open = acpi_thermal_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
L
Linus Torvalds 已提交
178 179
};

180
static const struct file_operations acpi_thermal_temp_fops = {
L
Len Brown 已提交
181 182 183 184
	.open = acpi_thermal_temp_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
L
Linus Torvalds 已提交
185 186
};

187
static const struct file_operations acpi_thermal_trip_fops = {
L
Len Brown 已提交
188 189 190 191
	.open = acpi_thermal_trip_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
L
Linus Torvalds 已提交
192 193
};

194
static const struct file_operations acpi_thermal_cooling_fops = {
L
Len Brown 已提交
195 196 197 198 199
	.open = acpi_thermal_cooling_open_fs,
	.read = seq_read,
	.write = acpi_thermal_write_cooling_mode,
	.llseek = seq_lseek,
	.release = single_release,
L
Linus Torvalds 已提交
200 201
};

202
static const struct file_operations acpi_thermal_polling_fops = {
L
Len Brown 已提交
203 204 205 206 207
	.open = acpi_thermal_polling_open_fs,
	.read = seq_read,
	.write = acpi_thermal_write_polling,
	.llseek = seq_lseek,
	.release = single_release,
L
Linus Torvalds 已提交
208 209 210 211 212 213
};

/* --------------------------------------------------------------------------
                             Thermal Zone Management
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
214
static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
215
{
L
Len Brown 已提交
216
	acpi_status status = AE_OK;
L
Linus Torvalds 已提交
217 218 219


	if (!tz)
220
		return -EINVAL;
L
Linus Torvalds 已提交
221 222 223

	tz->last_temperature = tz->temperature;

L
Len Brown 已提交
224
	status =
225
	    acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tz->temperature);
L
Linus Torvalds 已提交
226
	if (ACPI_FAILURE(status))
227
		return -ENODEV;
L
Linus Torvalds 已提交
228

L
Len Brown 已提交
229 230
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
			  tz->temperature));
L
Linus Torvalds 已提交
231

232
	return 0;
L
Linus Torvalds 已提交
233 234
}

L
Len Brown 已提交
235
static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
236
{
L
Len Brown 已提交
237
	acpi_status status = AE_OK;
L
Linus Torvalds 已提交
238 239 240


	if (!tz)
241
		return -EINVAL;
L
Linus Torvalds 已提交
242

L
Len Brown 已提交
243
	status =
244
	    acpi_evaluate_integer(tz->device->handle, "_TZP", NULL,
L
Len Brown 已提交
245
				  &tz->polling_frequency);
L
Linus Torvalds 已提交
246
	if (ACPI_FAILURE(status))
247
		return -ENODEV;
L
Linus Torvalds 已提交
248

L
Len Brown 已提交
249 250
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
			  tz->polling_frequency));
L
Linus Torvalds 已提交
251

252
	return 0;
L
Linus Torvalds 已提交
253 254
}

L
Len Brown 已提交
255
static int acpi_thermal_set_polling(struct acpi_thermal *tz, int seconds)
L
Linus Torvalds 已提交
256 257 258
{

	if (!tz)
259
		return -EINVAL;
L
Linus Torvalds 已提交
260 261 262

	tz->polling_frequency = seconds * 10;	/* Convert value to deci-seconds */

L
Len Brown 已提交
263 264
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "Polling frequency set to %lu seconds\n",
265
			  tz->polling_frequency/10));
L
Linus Torvalds 已提交
266

267
	return 0;
L
Linus Torvalds 已提交
268 269
}

L
Len Brown 已提交
270
static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
L
Linus Torvalds 已提交
271
{
L
Len Brown 已提交
272 273 274 275
	acpi_status status = AE_OK;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list arg_list = { 1, &arg0 };
	acpi_handle handle = NULL;
L
Linus Torvalds 已提交
276 277 278


	if (!tz)
279
		return -EINVAL;
L
Linus Torvalds 已提交
280

281
	status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
L
Linus Torvalds 已提交
282 283
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
284
		return -ENODEV;
L
Linus Torvalds 已提交
285 286 287 288 289 290
	}

	arg0.integer.value = mode;

	status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
	if (ACPI_FAILURE(status))
291
		return -ENODEV;
L
Linus Torvalds 已提交
292

293
	return 0;
L
Linus Torvalds 已提交
294 295
}

L
Len Brown 已提交
296
static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
297
{
L
Len Brown 已提交
298 299
	acpi_status status = AE_OK;
	int i = 0;
L
Linus Torvalds 已提交
300 301 302


	if (!tz)
303
		return -EINVAL;
L
Linus Torvalds 已提交
304 305 306

	/* Critical Shutdown (required) */

307
	status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL,
L
Len Brown 已提交
308
				       &tz->trips.critical.temperature);
L
Linus Torvalds 已提交
309 310
	if (ACPI_FAILURE(status)) {
		tz->trips.critical.flags.valid = 0;
311
		ACPI_EXCEPTION((AE_INFO, status, "No critical threshold"));
312
		return -ENODEV;
L
Len Brown 已提交
313
	} else {
L
Linus Torvalds 已提交
314
		tz->trips.critical.flags.valid = 1;
L
Len Brown 已提交
315 316 317
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Found critical threshold [%lu]\n",
				  tz->trips.critical.temperature));
L
Linus Torvalds 已提交
318 319 320 321
	}

	/* Critical Sleep (optional) */

L
Len Brown 已提交
322
	status =
323
	    acpi_evaluate_integer(tz->device->handle, "_HOT", NULL,
L
Len Brown 已提交
324
				  &tz->trips.hot.temperature);
L
Linus Torvalds 已提交
325 326 327
	if (ACPI_FAILURE(status)) {
		tz->trips.hot.flags.valid = 0;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No hot threshold\n"));
L
Len Brown 已提交
328
	} else {
L
Linus Torvalds 已提交
329
		tz->trips.hot.flags.valid = 1;
L
Len Brown 已提交
330 331
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found hot threshold [%lu]\n",
				  tz->trips.hot.temperature));
L
Linus Torvalds 已提交
332 333 334 335
	}

	/* Passive: Processors (optional) */

L
Len Brown 已提交
336
	status =
337
	    acpi_evaluate_integer(tz->device->handle, "_PSV", NULL,
L
Len Brown 已提交
338
				  &tz->trips.passive.temperature);
L
Linus Torvalds 已提交
339 340 341
	if (ACPI_FAILURE(status)) {
		tz->trips.passive.flags.valid = 0;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No passive threshold\n"));
L
Len Brown 已提交
342
	} else {
L
Linus Torvalds 已提交
343 344
		tz->trips.passive.flags.valid = 1;

L
Len Brown 已提交
345
		status =
346
		    acpi_evaluate_integer(tz->device->handle, "_TC1", NULL,
L
Len Brown 已提交
347
					  &tz->trips.passive.tc1);
L
Linus Torvalds 已提交
348 349 350
		if (ACPI_FAILURE(status))
			tz->trips.passive.flags.valid = 0;

L
Len Brown 已提交
351
		status =
352
		    acpi_evaluate_integer(tz->device->handle, "_TC2", NULL,
L
Len Brown 已提交
353
					  &tz->trips.passive.tc2);
L
Linus Torvalds 已提交
354 355 356
		if (ACPI_FAILURE(status))
			tz->trips.passive.flags.valid = 0;

L
Len Brown 已提交
357
		status =
358
		    acpi_evaluate_integer(tz->device->handle, "_TSP", NULL,
L
Len Brown 已提交
359
					  &tz->trips.passive.tsp);
L
Linus Torvalds 已提交
360 361 362
		if (ACPI_FAILURE(status))
			tz->trips.passive.flags.valid = 0;

L
Len Brown 已提交
363
		status =
364
		    acpi_evaluate_reference(tz->device->handle, "_PSL", NULL,
L
Len Brown 已提交
365
					    &tz->trips.passive.devices);
L
Linus Torvalds 已提交
366 367 368 369
		if (ACPI_FAILURE(status))
			tz->trips.passive.flags.valid = 0;

		if (!tz->trips.passive.flags.valid)
370
			printk(KERN_WARNING PREFIX "Invalid passive threshold\n");
L
Linus Torvalds 已提交
371
		else
L
Len Brown 已提交
372 373 374
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Found passive threshold [%lu]\n",
					  tz->trips.passive.temperature));
L
Linus Torvalds 已提交
375 376 377 378
	}

	/* Active: Fans, etc. (optional) */

L
Len Brown 已提交
379
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
L
Linus Torvalds 已提交
380

L
Len Brown 已提交
381
		char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
L
Linus Torvalds 已提交
382

L
Len Brown 已提交
383
		status =
384
		    acpi_evaluate_integer(tz->device->handle, name, NULL,
L
Len Brown 已提交
385
					  &tz->trips.active[i].temperature);
L
Linus Torvalds 已提交
386 387 388 389
		if (ACPI_FAILURE(status))
			break;

		name[2] = 'L';
L
Len Brown 已提交
390
		status =
391
		    acpi_evaluate_reference(tz->device->handle, name, NULL,
L
Len Brown 已提交
392
					    &tz->trips.active[i].devices);
L
Linus Torvalds 已提交
393 394
		if (ACPI_SUCCESS(status)) {
			tz->trips.active[i].flags.valid = 1;
L
Len Brown 已提交
395 396 397 398
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Found active threshold [%d]:[%lu]\n",
					  i, tz->trips.active[i].temperature));
		} else
399 400
			ACPI_EXCEPTION((AE_INFO, status,
					"Invalid active threshold [%d]", i));
L
Linus Torvalds 已提交
401 402
	}

403
	return 0;
L
Linus Torvalds 已提交
404 405
}

L
Len Brown 已提交
406
static int acpi_thermal_get_devices(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
407
{
L
Len Brown 已提交
408
	acpi_status status = AE_OK;
L
Linus Torvalds 已提交
409 410 411


	if (!tz)
412
		return -EINVAL;
L
Linus Torvalds 已提交
413

L
Len Brown 已提交
414
	status =
415
	    acpi_evaluate_reference(tz->device->handle, "_TZD", NULL, &tz->devices);
L
Linus Torvalds 已提交
416
	if (ACPI_FAILURE(status))
417
		return -ENODEV;
L
Linus Torvalds 已提交
418

419
	return 0;
L
Linus Torvalds 已提交
420 421
}

L
Len Brown 已提交
422
static int acpi_thermal_call_usermode(char *path)
L
Linus Torvalds 已提交
423
{
L
Len Brown 已提交
424 425
	char *argv[2] = { NULL, NULL };
	char *envp[3] = { NULL, NULL, NULL };
L
Linus Torvalds 已提交
426 427 428


	if (!path)
429
		return -EINVAL;
L
Linus Torvalds 已提交
430 431 432 433 434 435

	argv[0] = path;

	/* minimal command environment */
	envp[0] = "HOME=/";
	envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
L
Len Brown 已提交
436

L
Linus Torvalds 已提交
437 438
	call_usermodehelper(argv[0], argv, envp, 0);

439
	return 0;
L
Linus Torvalds 已提交
440 441
}

L
Len Brown 已提交
442
static int acpi_thermal_critical(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
443 444
{
	if (!tz || !tz->trips.critical.flags.valid)
445
		return -EINVAL;
L
Linus Torvalds 已提交
446 447

	if (tz->temperature >= tz->trips.critical.temperature) {
448
		printk(KERN_WARNING PREFIX "Critical trip point\n");
L
Linus Torvalds 已提交
449
		tz->trips.critical.flags.enabled = 1;
L
Len Brown 已提交
450
	} else if (tz->trips.critical.flags.enabled)
L
Linus Torvalds 已提交
451 452
		tz->trips.critical.flags.enabled = 0;

L
Len Brown 已提交
453 454 455
	printk(KERN_EMERG
	       "Critical temperature reached (%ld C), shutting down.\n",
	       KELVIN_TO_CELSIUS(tz->temperature));
456
	acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_CRITICAL,
L
Len Brown 已提交
457
				tz->trips.critical.flags.enabled);
L
Linus Torvalds 已提交
458 459 460

	acpi_thermal_call_usermode(ACPI_THERMAL_PATH_POWEROFF);

461
	return 0;
L
Linus Torvalds 已提交
462 463
}

L
Len Brown 已提交
464
static int acpi_thermal_hot(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
465 466
{
	if (!tz || !tz->trips.hot.flags.valid)
467
		return -EINVAL;
L
Linus Torvalds 已提交
468 469

	if (tz->temperature >= tz->trips.hot.temperature) {
470
		printk(KERN_WARNING PREFIX "Hot trip point\n");
L
Linus Torvalds 已提交
471
		tz->trips.hot.flags.enabled = 1;
L
Len Brown 已提交
472
	} else if (tz->trips.hot.flags.enabled)
L
Linus Torvalds 已提交
473 474
		tz->trips.hot.flags.enabled = 0;

475
	acpi_bus_generate_event(tz->device, ACPI_THERMAL_NOTIFY_HOT,
L
Len Brown 已提交
476
				tz->trips.hot.flags.enabled);
L
Linus Torvalds 已提交
477 478 479

	/* TBD: Call user-mode "sleep(S4)" function */

480
	return 0;
L
Linus Torvalds 已提交
481 482
}

483
static void acpi_thermal_passive(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
484
{
485
	int result = 1;
L
Linus Torvalds 已提交
486
	struct acpi_thermal_passive *passive = NULL;
L
Len Brown 已提交
487 488
	int trend = 0;
	int i = 0;
L
Linus Torvalds 已提交
489 490 491


	if (!tz || !tz->trips.passive.flags.valid)
492
		return;
L
Linus Torvalds 已提交
493 494 495 496 497 498 499 500 501 502 503

	passive = &(tz->trips.passive);

	/*
	 * Above Trip?
	 * -----------
	 * Calculate the thermal trend (using the passive cooling equation)
	 * and modify the performance limit for all passive cooling devices
	 * accordingly.  Note that we assume symmetry.
	 */
	if (tz->temperature >= passive->temperature) {
L
Len Brown 已提交
504 505 506 507 508 509 510 511
		trend =
		    (passive->tc1 * (tz->temperature - tz->last_temperature)) +
		    (passive->tc2 * (tz->temperature - passive->temperature));
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "trend[%d]=(tc1[%lu]*(tmp[%lu]-last[%lu]))+(tc2[%lu]*(tmp[%lu]-psv[%lu]))\n",
				  trend, passive->tc1, tz->temperature,
				  tz->last_temperature, passive->tc2,
				  tz->temperature, passive->temperature));
512
		passive->flags.enabled = 1;
L
Linus Torvalds 已提交
513 514
		/* Heating up? */
		if (trend > 0)
L
Len Brown 已提交
515 516 517 518 519
			for (i = 0; i < passive->devices.count; i++)
				acpi_processor_set_thermal_limit(passive->
								 devices.
								 handles[i],
								 ACPI_PROCESSOR_LIMIT_INCREMENT);
L
Linus Torvalds 已提交
520
		/* Cooling off? */
521
		else if (trend < 0) {
L
Len Brown 已提交
522
			for (i = 0; i < passive->devices.count; i++)
523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
				/*
				 * assume that we are on highest
				 * freq/lowest thrott and can leave
				 * passive mode, even in error case
				 */
				if (!acpi_processor_set_thermal_limit
				    (passive->devices.handles[i],
				     ACPI_PROCESSOR_LIMIT_DECREMENT))
					result = 0;
			/*
			 * Leave cooling mode, even if the temp might
			 * higher than trip point This is because some
			 * machines might have long thermal polling
			 * frequencies (tsp) defined. We will fall back
			 * into passive mode in next cycle (probably quicker)
			 */
			if (result) {
				passive->flags.enabled = 0;
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "Disabling passive cooling, still above threshold,"
						  " but we are cooling down\n"));
			}
		}
		return;
L
Linus Torvalds 已提交
547 548 549 550 551 552 553 554 555
	}

	/*
	 * Below Trip?
	 * -----------
	 * Implement passive cooling hysteresis to slowly increase performance
	 * and avoid thrashing around the passive trip point.  Note that we
	 * assume symmetry.
	 */
556 557 558 559 560 561 562 563 564 565 566
	if (!passive->flags.enabled)
		return;
	for (i = 0; i < passive->devices.count; i++)
		if (!acpi_processor_set_thermal_limit
		    (passive->devices.handles[i],
		     ACPI_PROCESSOR_LIMIT_DECREMENT))
			result = 0;
	if (result) {
		passive->flags.enabled = 0;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Disabling passive cooling (zone is cool)\n"));
L
Linus Torvalds 已提交
567 568 569
	}
}

570
static void acpi_thermal_active(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
571
{
L
Len Brown 已提交
572
	int result = 0;
L
Linus Torvalds 已提交
573
	struct acpi_thermal_active *active = NULL;
L
Len Brown 已提交
574 575 576
	int i = 0;
	int j = 0;
	unsigned long maxtemp = 0;
L
Linus Torvalds 已提交
577 578 579


	if (!tz)
580
		return;
L
Linus Torvalds 已提交
581

L
Len Brown 已提交
582
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
L
Linus Torvalds 已提交
583 584 585 586
		active = &(tz->trips.active[i]);
		if (!active || !active->flags.valid)
			break;
		if (tz->temperature >= active->temperature) {
587 588 589 590 591 592
			/*
			 * Above Threshold?
			 * ----------------
			 * If not already enabled, turn ON all cooling devices
			 * associated with this active threshold.
			 */
L
Linus Torvalds 已提交
593
			if (active->temperature > maxtemp)
594 595 596 597
				tz->state.active_index = i;
			maxtemp = active->temperature;
			if (active->flags.enabled)
				continue;
L
Linus Torvalds 已提交
598
			for (j = 0; j < active->devices.count; j++) {
L
Len Brown 已提交
599 600 601
				result =
				    acpi_bus_set_power(active->devices.
						       handles[j],
602
						       ACPI_STATE_D0);
L
Linus Torvalds 已提交
603
				if (result) {
604 605
					printk(KERN_WARNING PREFIX
						      "Unable to turn cooling device [%p] 'on'\n",
606
						      active->devices.
607
						      handles[j]);
L
Linus Torvalds 已提交
608 609
					continue;
				}
610
				active->flags.enabled = 1;
L
Len Brown 已提交
611
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
612
						  "Cooling device [%p] now 'on'\n",
L
Len Brown 已提交
613
						  active->devices.handles[j]));
L
Linus Torvalds 已提交
614
			}
615 616 617 618 619 620 621 622 623 624 625 626 627 628
			continue;
		}
		if (!active->flags.enabled)
			continue;
		/*
		 * Below Threshold?
		 * ----------------
		 * Turn OFF all cooling devices associated with this
		 * threshold.
		 */
		for (j = 0; j < active->devices.count; j++) {
			result = acpi_bus_set_power(active->devices.handles[j],
						    ACPI_STATE_D3);
			if (result) {
629 630 631
				printk(KERN_WARNING PREFIX
					      "Unable to turn cooling device [%p] 'off'\n",
					      active->devices.handles[j]);
632 633 634 635 636 637
				continue;
			}
			active->flags.enabled = 0;
			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
					  "Cooling device [%p] now 'off'\n",
					  active->devices.handles[j]));
L
Linus Torvalds 已提交
638 639 640 641
		}
	}
}

L
Len Brown 已提交
642
static void acpi_thermal_check(void *context);
L
Linus Torvalds 已提交
643

L
Len Brown 已提交
644
static void acpi_thermal_run(unsigned long data)
L
Linus Torvalds 已提交
645 646 647
{
	struct acpi_thermal *tz = (struct acpi_thermal *)data;
	if (!tz->zombie)
648
		acpi_os_execute(OSL_GPE_HANDLER, acpi_thermal_check, (void *)data);
L
Linus Torvalds 已提交
649 650
}

L
Len Brown 已提交
651
static void acpi_thermal_check(void *data)
L
Linus Torvalds 已提交
652
{
L
Len Brown 已提交
653
	int result = 0;
654
	struct acpi_thermal *tz = data;
L
Len Brown 已提交
655 656
	unsigned long sleep_time = 0;
	int i = 0;
L
Linus Torvalds 已提交
657 658 659 660
	struct acpi_thermal_state state;


	if (!tz) {
661
		printk(KERN_ERR PREFIX "Invalid (NULL) context\n");
662
		return;
L
Linus Torvalds 已提交
663 664 665 666 667 668
	}

	state = tz->state;

	result = acpi_thermal_get_temperature(tz);
	if (result)
669
		return;
L
Len Brown 已提交
670

L
Linus Torvalds 已提交
671
	memset(&tz->state, 0, sizeof(tz->state));
L
Len Brown 已提交
672

L
Linus Torvalds 已提交
673 674 675 676 677 678 679 680 681
	/*
	 * Check Trip Points
	 * -----------------
	 * Compare the current temperature to the trip point values to see
	 * if we've entered one of the thermal policy states.  Note that
	 * this function determines when a state is entered, but the 
	 * individual policy decides when it is exited (e.g. hysteresis).
	 */
	if (tz->trips.critical.flags.valid)
L
Len Brown 已提交
682 683
		state.critical |=
		    (tz->temperature >= tz->trips.critical.temperature);
L
Linus Torvalds 已提交
684 685 686
	if (tz->trips.hot.flags.valid)
		state.hot |= (tz->temperature >= tz->trips.hot.temperature);
	if (tz->trips.passive.flags.valid)
L
Len Brown 已提交
687 688 689
		state.passive |=
		    (tz->temperature >= tz->trips.passive.temperature);
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
L
Linus Torvalds 已提交
690
		if (tz->trips.active[i].flags.valid)
L
Len Brown 已提交
691 692 693
			state.active |=
			    (tz->temperature >=
			     tz->trips.active[i].temperature);
L
Linus Torvalds 已提交
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715

	/*
	 * Invoke Policy
	 * -------------
	 * Separated from the above check to allow individual policy to 
	 * determine when to exit a given state.
	 */
	if (state.critical)
		acpi_thermal_critical(tz);
	if (state.hot)
		acpi_thermal_hot(tz);
	if (state.passive)
		acpi_thermal_passive(tz);
	if (state.active)
		acpi_thermal_active(tz);

	/*
	 * Calculate State
	 * ---------------
	 * Again, separated from the above two to allow independent policy
	 * decisions.
	 */
716 717 718 719
	tz->state.critical = tz->trips.critical.flags.enabled;
	tz->state.hot = tz->trips.hot.flags.enabled;
	tz->state.passive = tz->trips.passive.flags.enabled;
	tz->state.active = 0;
L
Len Brown 已提交
720
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
721
		tz->state.active |= tz->trips.active[i].flags.enabled;
L
Linus Torvalds 已提交
722 723 724 725 726 727 728 729 730 731 732 733 734 735 736

	/*
	 * Calculate Sleep Time
	 * --------------------
	 * If we're in the passive state, use _TSP's value.  Otherwise
	 * use the default polling frequency (e.g. _TZP).  If no polling
	 * frequency is specified then we'll wait forever (at least until
	 * a thermal event occurs).  Note that _TSP and _TZD values are
	 * given in 1/10th seconds (we must covert to milliseconds).
	 */
	if (tz->state.passive)
		sleep_time = tz->trips.passive.tsp * 100;
	else if (tz->polling_frequency > 0)
		sleep_time = tz->polling_frequency * 100;

L
Len Brown 已提交
737 738
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s: temperature[%lu] sleep[%lu]\n",
			  tz->name, tz->temperature, sleep_time));
L
Linus Torvalds 已提交
739 740 741 742 743 744 745 746

	/*
	 * Schedule Next Poll
	 * ------------------
	 */
	if (!sleep_time) {
		if (timer_pending(&(tz->timer)))
			del_timer(&(tz->timer));
L
Len Brown 已提交
747
	} else {
L
Linus Torvalds 已提交
748
		if (timer_pending(&(tz->timer)))
749 750
			mod_timer(&(tz->timer),
					jiffies + (HZ * sleep_time) / 1000);
L
Linus Torvalds 已提交
751
		else {
L
Len Brown 已提交
752
			tz->timer.data = (unsigned long)tz;
L
Linus Torvalds 已提交
753 754 755 756 757 758
			tz->timer.function = acpi_thermal_run;
			tz->timer.expires = jiffies + (HZ * sleep_time) / 1000;
			add_timer(&(tz->timer));
		}
	}

759
	return;
L
Linus Torvalds 已提交
760 761 762 763 764 765
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
766
static struct proc_dir_entry *acpi_thermal_dir;
L
Linus Torvalds 已提交
767 768 769

static int acpi_thermal_state_seq_show(struct seq_file *seq, void *offset)
{
770
	struct acpi_thermal *tz = seq->private;
L
Linus Torvalds 已提交
771 772 773 774 775 776 777


	if (!tz)
		goto end;

	seq_puts(seq, "state:                   ");

L
Len Brown 已提交
778 779
	if (!tz->state.critical && !tz->state.hot && !tz->state.passive
	    && !tz->state.active)
L
Linus Torvalds 已提交
780 781 782 783 784 785 786 787 788 789 790 791 792
		seq_puts(seq, "ok\n");
	else {
		if (tz->state.critical)
			seq_puts(seq, "critical ");
		if (tz->state.hot)
			seq_puts(seq, "hot ");
		if (tz->state.passive)
			seq_puts(seq, "passive ");
		if (tz->state.active)
			seq_printf(seq, "active[%d]", tz->state.active_index);
		seq_puts(seq, "\n");
	}

L
Len Brown 已提交
793
      end:
794
	return 0;
L
Linus Torvalds 已提交
795 796 797 798 799 800 801 802 803
}

static int acpi_thermal_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_state_seq_show, PDE(inode)->data);
}

static int acpi_thermal_temp_seq_show(struct seq_file *seq, void *offset)
{
L
Len Brown 已提交
804
	int result = 0;
805
	struct acpi_thermal *tz = seq->private;
L
Linus Torvalds 已提交
806 807 808 809 810 811 812 813 814


	if (!tz)
		goto end;

	result = acpi_thermal_get_temperature(tz);
	if (result)
		goto end;

L
Len Brown 已提交
815 816
	seq_printf(seq, "temperature:             %ld C\n",
		   KELVIN_TO_CELSIUS(tz->temperature));
L
Linus Torvalds 已提交
817

L
Len Brown 已提交
818
      end:
819
	return 0;
L
Linus Torvalds 已提交
820 821 822 823 824 825 826 827 828
}

static int acpi_thermal_temp_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_temp_seq_show, PDE(inode)->data);
}

static int acpi_thermal_trip_seq_show(struct seq_file *seq, void *offset)
{
829
	struct acpi_thermal *tz = seq->private;
L
Len Brown 已提交
830 831
	int i = 0;
	int j = 0;
L
Linus Torvalds 已提交
832 833 834 835 836 837 838


	if (!tz)
		goto end;

	if (tz->trips.critical.flags.valid)
		seq_printf(seq, "critical (S5):           %ld C\n",
L
Len Brown 已提交
839
			   KELVIN_TO_CELSIUS(tz->trips.critical.temperature));
L
Linus Torvalds 已提交
840 841 842

	if (tz->trips.hot.flags.valid)
		seq_printf(seq, "hot (S4):                %ld C\n",
L
Len Brown 已提交
843
			   KELVIN_TO_CELSIUS(tz->trips.hot.temperature));
L
Linus Torvalds 已提交
844 845

	if (tz->trips.passive.flags.valid) {
L
Len Brown 已提交
846 847 848 849 850 851 852 853 854
		seq_printf(seq,
			   "passive:                 %ld C: tc1=%lu tc2=%lu tsp=%lu devices=",
			   KELVIN_TO_CELSIUS(tz->trips.passive.temperature),
			   tz->trips.passive.tc1, tz->trips.passive.tc2,
			   tz->trips.passive.tsp);
		for (j = 0; j < tz->trips.passive.devices.count; j++) {

			seq_printf(seq, "0x%p ",
				   tz->trips.passive.devices.handles[j]);
L
Linus Torvalds 已提交
855 856 857 858 859 860 861 862
		}
		seq_puts(seq, "\n");
	}

	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
		if (!(tz->trips.active[i].flags.valid))
			break;
		seq_printf(seq, "active[%d]:               %ld C: devices=",
L
Len Brown 已提交
863 864 865
			   i,
			   KELVIN_TO_CELSIUS(tz->trips.active[i].temperature));
		for (j = 0; j < tz->trips.active[i].devices.count; j++)
L
Linus Torvalds 已提交
866
			seq_printf(seq, "0x%p ",
L
Len Brown 已提交
867
				   tz->trips.active[i].devices.handles[j]);
L
Linus Torvalds 已提交
868 869 870
		seq_puts(seq, "\n");
	}

L
Len Brown 已提交
871
      end:
872
	return 0;
L
Linus Torvalds 已提交
873 874 875 876 877 878 879 880 881
}

static int acpi_thermal_trip_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_trip_seq_show, PDE(inode)->data);
}

static int acpi_thermal_cooling_seq_show(struct seq_file *seq, void *offset)
{
882
	struct acpi_thermal *tz = seq->private;
L
Linus Torvalds 已提交
883 884 885 886 887


	if (!tz)
		goto end;

888
	if (!tz->flags.cooling_mode)
L
Linus Torvalds 已提交
889 890
		seq_puts(seq, "<setting not supported>\n");
	else
891
		seq_puts(seq, "0 - Active; 1 - Passive\n");
L
Linus Torvalds 已提交
892

L
Len Brown 已提交
893
      end:
894
	return 0;
L
Linus Torvalds 已提交
895 896 897 898 899
}

static int acpi_thermal_cooling_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_cooling_seq_show,
L
Len Brown 已提交
900
			   PDE(inode)->data);
L
Linus Torvalds 已提交
901 902 903
}

static ssize_t
L
Len Brown 已提交
904 905 906
acpi_thermal_write_cooling_mode(struct file *file,
				const char __user * buffer,
				size_t count, loff_t * ppos)
L
Linus Torvalds 已提交
907
{
908 909
	struct seq_file *m = file->private_data;
	struct acpi_thermal *tz = m->private;
L
Len Brown 已提交
910 911
	int result = 0;
	char mode_string[12] = { '\0' };
L
Linus Torvalds 已提交
912 913 914


	if (!tz || (count > sizeof(mode_string) - 1))
915
		return -EINVAL;
L
Linus Torvalds 已提交
916 917

	if (!tz->flags.cooling_mode)
918
		return -ENODEV;
L
Linus Torvalds 已提交
919 920

	if (copy_from_user(mode_string, buffer, count))
921
		return -EFAULT;
L
Len Brown 已提交
922

L
Linus Torvalds 已提交
923
	mode_string[count] = '\0';
L
Len Brown 已提交
924 925 926 927

	result = acpi_thermal_set_cooling_mode(tz,
					       simple_strtoul(mode_string, NULL,
							      0));
L
Linus Torvalds 已提交
928
	if (result)
929
		return result;
L
Linus Torvalds 已提交
930 931 932

	acpi_thermal_check(tz);

933
	return count;
L
Linus Torvalds 已提交
934 935 936 937
}

static int acpi_thermal_polling_seq_show(struct seq_file *seq, void *offset)
{
938
	struct acpi_thermal *tz = seq->private;
L
Linus Torvalds 已提交
939 940 941 942 943 944 945 946 947 948 949


	if (!tz)
		goto end;

	if (!tz->polling_frequency) {
		seq_puts(seq, "<polling disabled>\n");
		goto end;
	}

	seq_printf(seq, "polling frequency:       %lu seconds\n",
L
Len Brown 已提交
950
		   (tz->polling_frequency / 10));
L
Linus Torvalds 已提交
951

L
Len Brown 已提交
952
      end:
953
	return 0;
L
Linus Torvalds 已提交
954 955 956 957 958
}

static int acpi_thermal_polling_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_thermal_polling_seq_show,
L
Len Brown 已提交
959
			   PDE(inode)->data);
L
Linus Torvalds 已提交
960 961 962
}

static ssize_t
L
Len Brown 已提交
963 964 965
acpi_thermal_write_polling(struct file *file,
			   const char __user * buffer,
			   size_t count, loff_t * ppos)
L
Linus Torvalds 已提交
966
{
967 968
	struct seq_file *m = file->private_data;
	struct acpi_thermal *tz = m->private;
L
Len Brown 已提交
969 970 971
	int result = 0;
	char polling_string[12] = { '\0' };
	int seconds = 0;
L
Linus Torvalds 已提交
972 973 974


	if (!tz || (count > sizeof(polling_string) - 1))
975
		return -EINVAL;
L
Len Brown 已提交
976

L
Linus Torvalds 已提交
977
	if (copy_from_user(polling_string, buffer, count))
978
		return -EFAULT;
L
Len Brown 已提交
979

L
Linus Torvalds 已提交
980 981 982
	polling_string[count] = '\0';

	seconds = simple_strtoul(polling_string, NULL, 0);
L
Len Brown 已提交
983

L
Linus Torvalds 已提交
984 985
	result = acpi_thermal_set_polling(tz, seconds);
	if (result)
986
		return result;
L
Linus Torvalds 已提交
987 988 989

	acpi_thermal_check(tz);

990
	return count;
L
Linus Torvalds 已提交
991 992
}

L
Len Brown 已提交
993
static int acpi_thermal_add_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
994
{
L
Len Brown 已提交
995
	struct proc_dir_entry *entry = NULL;
L
Linus Torvalds 已提交
996 997 998 999


	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
L
Len Brown 已提交
1000
						     acpi_thermal_dir);
L
Linus Torvalds 已提交
1001
		if (!acpi_device_dir(device))
1002
			return -ENODEV;
L
Linus Torvalds 已提交
1003 1004 1005 1006 1007
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'state' [R] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_STATE,
L
Len Brown 已提交
1008
				  S_IRUGO, acpi_device_dir(device));
L
Linus Torvalds 已提交
1009
	if (!entry)
1010
		return -ENODEV;
L
Linus Torvalds 已提交
1011 1012 1013 1014 1015 1016 1017 1018
	else {
		entry->proc_fops = &acpi_thermal_state_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'temperature' [R] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
L
Len Brown 已提交
1019
				  S_IRUGO, acpi_device_dir(device));
L
Linus Torvalds 已提交
1020
	if (!entry)
1021
		return -ENODEV;
L
Linus Torvalds 已提交
1022 1023 1024 1025 1026 1027 1028 1029
	else {
		entry->proc_fops = &acpi_thermal_temp_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'trip_points' [R/W] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
L
Len Brown 已提交
1030 1031
				  S_IFREG | S_IRUGO | S_IWUSR,
				  acpi_device_dir(device));
L
Linus Torvalds 已提交
1032
	if (!entry)
1033
		return -ENODEV;
L
Linus Torvalds 已提交
1034 1035 1036 1037 1038 1039 1040 1041
	else {
		entry->proc_fops = &acpi_thermal_trip_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'cooling_mode' [R/W] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
L
Len Brown 已提交
1042 1043
				  S_IFREG | S_IRUGO | S_IWUSR,
				  acpi_device_dir(device));
L
Linus Torvalds 已提交
1044
	if (!entry)
1045
		return -ENODEV;
L
Linus Torvalds 已提交
1046 1047 1048 1049 1050 1051 1052 1053
	else {
		entry->proc_fops = &acpi_thermal_cooling_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'polling_frequency' [R/W] */
	entry = create_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
L
Len Brown 已提交
1054 1055
				  S_IFREG | S_IRUGO | S_IWUSR,
				  acpi_device_dir(device));
L
Linus Torvalds 已提交
1056
	if (!entry)
1057
		return -ENODEV;
L
Linus Torvalds 已提交
1058 1059 1060 1061 1062 1063
	else {
		entry->proc_fops = &acpi_thermal_polling_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

1064
	return 0;
L
Linus Torvalds 已提交
1065 1066
}

L
Len Brown 已提交
1067
static int acpi_thermal_remove_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084
{

	if (acpi_device_dir(device)) {
		remove_proc_entry(ACPI_THERMAL_FILE_POLLING_FREQ,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_COOLING_MODE,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_TRIP_POINTS,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_TEMPERATURE,
				  acpi_device_dir(device));
		remove_proc_entry(ACPI_THERMAL_FILE_STATE,
				  acpi_device_dir(device));
		remove_proc_entry(acpi_device_bid(device), acpi_thermal_dir);
		acpi_device_dir(device) = NULL;
	}

1085
	return 0;
L
Linus Torvalds 已提交
1086 1087 1088 1089 1090 1091
}

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
1092
static void acpi_thermal_notify(acpi_handle handle, u32 event, void *data)
L
Linus Torvalds 已提交
1093
{
1094
	struct acpi_thermal *tz = data;
L
Len Brown 已提交
1095
	struct acpi_device *device = NULL;
L
Linus Torvalds 已提交
1096 1097 1098


	if (!tz)
1099
		return;
L
Linus Torvalds 已提交
1100

1101
	device = tz->device;
L
Linus Torvalds 已提交
1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118

	switch (event) {
	case ACPI_THERMAL_NOTIFY_TEMPERATURE:
		acpi_thermal_check(tz);
		break;
	case ACPI_THERMAL_NOTIFY_THRESHOLDS:
		acpi_thermal_get_trip_points(tz);
		acpi_thermal_check(tz);
		acpi_bus_generate_event(device, event, 0);
		break;
	case ACPI_THERMAL_NOTIFY_DEVICES:
		if (tz->flags.devices)
			acpi_thermal_get_devices(tz);
		acpi_bus_generate_event(device, event, 0);
		break;
	default:
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
L
Len Brown 已提交
1119
				  "Unsupported event [0x%x]\n", event));
L
Linus Torvalds 已提交
1120 1121 1122
		break;
	}

1123
	return;
L
Linus Torvalds 已提交
1124 1125
}

L
Len Brown 已提交
1126
static int acpi_thermal_get_info(struct acpi_thermal *tz)
L
Linus Torvalds 已提交
1127
{
L
Len Brown 已提交
1128
	int result = 0;
L
Linus Torvalds 已提交
1129 1130 1131


	if (!tz)
1132
		return -EINVAL;
L
Linus Torvalds 已提交
1133 1134 1135 1136

	/* Get temperature [_TMP] (required) */
	result = acpi_thermal_get_temperature(tz);
	if (result)
1137
		return result;
L
Linus Torvalds 已提交
1138 1139 1140 1141

	/* Get trip points [_CRT, _PSV, etc.] (required) */
	result = acpi_thermal_get_trip_points(tz);
	if (result)
1142
		return result;
L
Linus Torvalds 已提交
1143 1144 1145

	/* Set the cooling mode [_SCP] to active cooling (default) */
	result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
L
Len Brown 已提交
1146
	if (!result)
L
Linus Torvalds 已提交
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159
		tz->flags.cooling_mode = 1;

	/* Get default polling frequency [_TZP] (optional) */
	if (tzp)
		tz->polling_frequency = tzp;
	else
		acpi_thermal_get_polling_frequency(tz);

	/* Get devices in this thermal zone [_TZD] (optional) */
	result = acpi_thermal_get_devices(tz);
	if (!result)
		tz->flags.devices = 1;

1160
	return 0;
L
Linus Torvalds 已提交
1161 1162
}

L
Len Brown 已提交
1163
static int acpi_thermal_add(struct acpi_device *device)
L
Linus Torvalds 已提交
1164
{
L
Len Brown 已提交
1165 1166 1167
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_thermal *tz = NULL;
L
Linus Torvalds 已提交
1168 1169 1170


	if (!device)
1171
		return -EINVAL;
L
Linus Torvalds 已提交
1172

1173
	tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
L
Linus Torvalds 已提交
1174
	if (!tz)
1175
		return -ENOMEM;
L
Linus Torvalds 已提交
1176

1177
	tz->device = device;
L
Linus Torvalds 已提交
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188
	strcpy(tz->name, device->pnp.bus_id);
	strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
	acpi_driver_data(device) = tz;

	result = acpi_thermal_get_info(tz);
	if (result)
		goto end;

	result = acpi_thermal_add_fs(device);
	if (result)
1189
		goto end;
L
Linus Torvalds 已提交
1190 1191 1192 1193 1194

	init_timer(&tz->timer);

	acpi_thermal_check(tz);

1195
	status = acpi_install_notify_handler(device->handle,
L
Len Brown 已提交
1196 1197
					     ACPI_DEVICE_NOTIFY,
					     acpi_thermal_notify, tz);
L
Linus Torvalds 已提交
1198 1199 1200 1201 1202 1203
	if (ACPI_FAILURE(status)) {
		result = -ENODEV;
		goto end;
	}

	printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
L
Len Brown 已提交
1204 1205
	       acpi_device_name(device), acpi_device_bid(device),
	       KELVIN_TO_CELSIUS(tz->temperature));
L
Linus Torvalds 已提交
1206

L
Len Brown 已提交
1207
      end:
L
Linus Torvalds 已提交
1208 1209 1210 1211 1212
	if (result) {
		acpi_thermal_remove_fs(device);
		kfree(tz);
	}

1213
	return result;
L
Linus Torvalds 已提交
1214 1215
}

L
Len Brown 已提交
1216
static int acpi_thermal_remove(struct acpi_device *device, int type)
L
Linus Torvalds 已提交
1217
{
L
Len Brown 已提交
1218 1219
	acpi_status status = AE_OK;
	struct acpi_thermal *tz = NULL;
L
Linus Torvalds 已提交
1220 1221 1222


	if (!device || !acpi_driver_data(device))
1223
		return -EINVAL;
L
Linus Torvalds 已提交
1224

1225
	tz = acpi_driver_data(device);
L
Linus Torvalds 已提交
1226 1227 1228 1229 1230 1231 1232 1233 1234 1235

	/* avoid timer adding new defer task */
	tz->zombie = 1;
	/* wait for running timer (on other CPUs) finish */
	del_timer_sync(&(tz->timer));
	/* synchronize deferred task */
	acpi_os_wait_events_complete(NULL);
	/* deferred task may reinsert timer */
	del_timer_sync(&(tz->timer));

1236
	status = acpi_remove_notify_handler(device->handle,
L
Len Brown 已提交
1237 1238
					    ACPI_DEVICE_NOTIFY,
					    acpi_thermal_notify);
L
Linus Torvalds 已提交
1239 1240

	/* Terminate policy */
L
Len Brown 已提交
1241
	if (tz->trips.passive.flags.valid && tz->trips.passive.flags.enabled) {
L
Linus Torvalds 已提交
1242 1243 1244 1245
		tz->trips.passive.flags.enabled = 0;
		acpi_thermal_passive(tz);
	}
	if (tz->trips.active[0].flags.valid
L
Len Brown 已提交
1246
	    && tz->trips.active[0].flags.enabled) {
L
Linus Torvalds 已提交
1247 1248 1249 1250 1251 1252 1253
		tz->trips.active[0].flags.enabled = 0;
		acpi_thermal_active(tz);
	}

	acpi_thermal_remove_fs(device);

	kfree(tz);
1254
	return 0;
L
Linus Torvalds 已提交
1255 1256
}

1257
static int acpi_thermal_resume(struct acpi_device *device)
1258 1259
{
	struct acpi_thermal *tz = NULL;
1260 1261
	int i, j, power_state, result;

1262 1263

	if (!device || !acpi_driver_data(device))
1264
		return -EINVAL;
1265

1266
	tz = acpi_driver_data(device);
1267

1268
	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280
		if (!(&tz->trips.active[i]))
			break;
		if (!tz->trips.active[i].flags.valid)
			break;
		tz->trips.active[i].flags.enabled = 1;
		for (j = 0; j < tz->trips.active[i].devices.count; j++) {
			result = acpi_bus_get_power(tz->trips.active[i].devices.
			    handles[j], &power_state);
			if (result || (power_state != ACPI_STATE_D0)) {
				tz->trips.active[i].flags.enabled = 0;
				break;
			}
1281
		}
1282
		tz->state.active |= tz->trips.active[i].flags.enabled;
1283 1284
	}

1285
	acpi_thermal_check(tz);
1286 1287 1288 1289

	return AE_OK;
}

L
Len Brown 已提交
1290
static int __init acpi_thermal_init(void)
L
Linus Torvalds 已提交
1291
{
L
Len Brown 已提交
1292
	int result = 0;
L
Linus Torvalds 已提交
1293 1294 1295 1296


	acpi_thermal_dir = proc_mkdir(ACPI_THERMAL_CLASS, acpi_root_dir);
	if (!acpi_thermal_dir)
1297
		return -ENODEV;
L
Linus Torvalds 已提交
1298 1299 1300 1301 1302
	acpi_thermal_dir->owner = THIS_MODULE;

	result = acpi_bus_register_driver(&acpi_thermal_driver);
	if (result < 0) {
		remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);
1303
		return -ENODEV;
L
Linus Torvalds 已提交
1304 1305
	}

1306
	return 0;
L
Linus Torvalds 已提交
1307 1308
}

L
Len Brown 已提交
1309
static void __exit acpi_thermal_exit(void)
L
Linus Torvalds 已提交
1310 1311 1312 1313 1314 1315
{

	acpi_bus_unregister_driver(&acpi_thermal_driver);

	remove_proc_entry(ACPI_THERMAL_CLASS, acpi_root_dir);

1316
	return;
L
Linus Torvalds 已提交
1317 1318 1319 1320
}

module_init(acpi_thermal_init);
module_exit(acpi_thermal_exit);