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1 /*
2  * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
3  * sensors, fan control, keyboard backlight control) used in Intel-based Apple
4  * computers.
5  *
6  * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
7  * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
8  *
9  * Based on hdaps.c driver:
10  * Copyright (C) 2005 Robert Love <rml@novell.com>
11  * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
12  *
13  * Fan control based on smcFanControl:
14  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
15  *
16  * This program is free software; you can redistribute it and/or modify it
17  * under the terms of the GNU General Public License v2 as published by the
18  * Free Software Foundation.
19  *
20  * This program is distributed in the hope that it will be useful, but WITHOUT
21  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
22  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
23  * more details.
24  *
25  * You should have received a copy of the GNU General Public License along with
26  * this program; if not, write to the Free Software Foundation, Inc.,
27  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
28  */
29 
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31 
32 #include <linux/delay.h>
33 #include <linux/platform_device.h>
34 #include <linux/input-polldev.h>
35 #include <linux/kernel.h>
36 #include <linux/slab.h>
37 #include <linux/module.h>
38 #include <linux/timer.h>
39 #include <linux/dmi.h>
40 #include <linux/mutex.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/io.h>
43 #include <linux/leds.h>
44 #include <linux/hwmon.h>
45 #include <linux/workqueue.h>
46 #include <linux/err.h>
47 
48 /* data port used by Apple SMC */
49 #define APPLESMC_DATA_PORT	0x300
50 /* command/status port used by Apple SMC */
51 #define APPLESMC_CMD_PORT	0x304
52 
53 #define APPLESMC_NR_PORTS	32 /* 0x300-0x31f */
54 
55 #define APPLESMC_MAX_DATA_LENGTH 32
56 
57 /* wait up to 128 ms for a status change. */
58 #define APPLESMC_MIN_WAIT	0x0010
59 #define APPLESMC_RETRY_WAIT	0x0100
60 #define APPLESMC_MAX_WAIT	0x20000
61 
62 #define APPLESMC_READ_CMD	0x10
63 #define APPLESMC_WRITE_CMD	0x11
64 #define APPLESMC_GET_KEY_BY_INDEX_CMD	0x12
65 #define APPLESMC_GET_KEY_TYPE_CMD	0x13
66 
67 #define KEY_COUNT_KEY		"#KEY" /* r-o ui32 */
68 
69 #define LIGHT_SENSOR_LEFT_KEY	"ALV0" /* r-o {alv (6-10 bytes) */
70 #define LIGHT_SENSOR_RIGHT_KEY	"ALV1" /* r-o {alv (6-10 bytes) */
71 #define BACKLIGHT_KEY		"LKSB" /* w-o {lkb (2 bytes) */
72 
73 #define CLAMSHELL_KEY		"MSLD" /* r-o ui8 (unused) */
74 
75 #define MOTION_SENSOR_X_KEY	"MO_X" /* r-o sp78 (2 bytes) */
76 #define MOTION_SENSOR_Y_KEY	"MO_Y" /* r-o sp78 (2 bytes) */
77 #define MOTION_SENSOR_Z_KEY	"MO_Z" /* r-o sp78 (2 bytes) */
78 #define MOTION_SENSOR_KEY	"MOCN" /* r/w ui16 */
79 
80 #define FANS_COUNT		"FNum" /* r-o ui8 */
81 #define FANS_MANUAL		"FS! " /* r-w ui16 */
82 #define FAN_ID_FMT		"F%dID" /* r-o char[16] */
83 
84 #define TEMP_SENSOR_TYPE	"sp78"
85 
86 /* List of keys used to read/write fan speeds */
87 static const char *const fan_speed_fmt[] = {
88 	"F%dAc",		/* actual speed */
89 	"F%dMn",		/* minimum speed (rw) */
90 	"F%dMx",		/* maximum speed */
91 	"F%dSf",		/* safe speed - not all models */
92 	"F%dTg",		/* target speed (manual: rw) */
93 };
94 
95 #define INIT_TIMEOUT_MSECS	5000	/* wait up to 5s for device init ... */
96 #define INIT_WAIT_MSECS		50	/* ... in 50ms increments */
97 
98 #define APPLESMC_POLL_INTERVAL	50	/* msecs */
99 #define APPLESMC_INPUT_FUZZ	4	/* input event threshold */
100 #define APPLESMC_INPUT_FLAT	4
101 
102 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
103 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
104 
105 /* Dynamic device node attributes */
106 struct applesmc_dev_attr {
107 	struct sensor_device_attribute sda;	/* hwmon attributes */
108 	char name[32];				/* room for node file name */
109 };
110 
111 /* Dynamic device node group */
112 struct applesmc_node_group {
113 	char *format;				/* format string */
114 	void *show;				/* show function */
115 	void *store;				/* store function */
116 	int option;				/* function argument */
117 	struct applesmc_dev_attr *nodes;	/* dynamic node array */
118 };
119 
120 /* AppleSMC entry - cached register information */
121 struct applesmc_entry {
122 	char key[5];		/* four-letter key code */
123 	u8 valid;		/* set when entry is successfully read once */
124 	u8 len;			/* bounded by APPLESMC_MAX_DATA_LENGTH */
125 	char type[5];		/* four-letter type code */
126 	u8 flags;		/* 0x10: func; 0x40: write; 0x80: read */
127 };
128 
129 /* Register lookup and registers common to all SMCs */
130 static struct applesmc_registers {
131 	struct mutex mutex;		/* register read/write mutex */
132 	unsigned int key_count;		/* number of SMC registers */
133 	unsigned int fan_count;		/* number of fans */
134 	unsigned int temp_count;	/* number of temperature registers */
135 	unsigned int temp_begin;	/* temperature lower index bound */
136 	unsigned int temp_end;		/* temperature upper index bound */
137 	unsigned int index_count;	/* size of temperature index array */
138 	int num_light_sensors;		/* number of light sensors */
139 	bool has_accelerometer;		/* has motion sensor */
140 	bool has_key_backlight;		/* has keyboard backlight */
141 	bool init_complete;		/* true when fully initialized */
142 	struct applesmc_entry *cache;	/* cached key entries */
143 	const char **index;		/* temperature key index */
144 } smcreg = {
145 	.mutex = __MUTEX_INITIALIZER(smcreg.mutex),
146 };
147 
148 static const int debug;
149 static struct platform_device *pdev;
150 static s16 rest_x;
151 static s16 rest_y;
152 static u8 backlight_state[2];
153 
154 static struct device *hwmon_dev;
155 static struct input_polled_dev *applesmc_idev;
156 
157 /*
158  * Last index written to key_at_index sysfs file, and value to use for all other
159  * key_at_index_* sysfs files.
160  */
161 static unsigned int key_at_index;
162 
163 static struct workqueue_struct *applesmc_led_wq;
164 
165 /*
166  * wait_read - Wait for a byte to appear on SMC port. Callers must
167  * hold applesmc_lock.
168  */
wait_read(void)169 static int wait_read(void)
170 {
171 	u8 status;
172 	int us;
173 	for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
174 		udelay(us);
175 		status = inb(APPLESMC_CMD_PORT);
176 		/* read: wait for smc to settle */
177 		if (status & 0x01)
178 			return 0;
179 	}
180 
181 	pr_warn("wait_read() fail: 0x%02x\n", status);
182 	return -EIO;
183 }
184 
185 /*
186  * send_byte - Write to SMC port, retrying when necessary. Callers
187  * must hold applesmc_lock.
188  */
send_byte(u8 cmd,u16 port)189 static int send_byte(u8 cmd, u16 port)
190 {
191 	u8 status;
192 	int us;
193 
194 	outb(cmd, port);
195 	for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
196 		udelay(us);
197 		status = inb(APPLESMC_CMD_PORT);
198 		/* write: wait for smc to settle */
199 		if (status & 0x02)
200 			continue;
201 		/* ready: cmd accepted, return */
202 		if (status & 0x04)
203 			return 0;
204 		/* timeout: give up */
205 		if (us << 1 == APPLESMC_MAX_WAIT)
206 			break;
207 		/* busy: long wait and resend */
208 		udelay(APPLESMC_RETRY_WAIT);
209 		outb(cmd, port);
210 	}
211 
212 	pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status);
213 	return -EIO;
214 }
215 
send_command(u8 cmd)216 static int send_command(u8 cmd)
217 {
218 	return send_byte(cmd, APPLESMC_CMD_PORT);
219 }
220 
send_argument(const char * key)221 static int send_argument(const char *key)
222 {
223 	int i;
224 
225 	for (i = 0; i < 4; i++)
226 		if (send_byte(key[i], APPLESMC_DATA_PORT))
227 			return -EIO;
228 	return 0;
229 }
230 
read_smc(u8 cmd,const char * key,u8 * buffer,u8 len)231 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
232 {
233 	u8 status, data = 0;
234 	int i;
235 
236 	if (send_command(cmd) || send_argument(key)) {
237 		pr_warn("%.4s: read arg fail\n", key);
238 		return -EIO;
239 	}
240 
241 	/* This has no effect on newer (2012) SMCs */
242 	if (send_byte(len, APPLESMC_DATA_PORT)) {
243 		pr_warn("%.4s: read len fail\n", key);
244 		return -EIO;
245 	}
246 
247 	for (i = 0; i < len; i++) {
248 		if (wait_read()) {
249 			pr_warn("%.4s: read data[%d] fail\n", key, i);
250 			return -EIO;
251 		}
252 		buffer[i] = inb(APPLESMC_DATA_PORT);
253 	}
254 
255 	/* Read the data port until bit0 is cleared */
256 	for (i = 0; i < 16; i++) {
257 		udelay(APPLESMC_MIN_WAIT);
258 		status = inb(APPLESMC_CMD_PORT);
259 		if (!(status & 0x01))
260 			break;
261 		data = inb(APPLESMC_DATA_PORT);
262 	}
263 	if (i)
264 		pr_warn("flushed %d bytes, last value is: %d\n", i, data);
265 
266 	return 0;
267 }
268 
write_smc(u8 cmd,const char * key,const u8 * buffer,u8 len)269 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
270 {
271 	int i;
272 
273 	if (send_command(cmd) || send_argument(key)) {
274 		pr_warn("%s: write arg fail\n", key);
275 		return -EIO;
276 	}
277 
278 	if (send_byte(len, APPLESMC_DATA_PORT)) {
279 		pr_warn("%.4s: write len fail\n", key);
280 		return -EIO;
281 	}
282 
283 	for (i = 0; i < len; i++) {
284 		if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
285 			pr_warn("%s: write data fail\n", key);
286 			return -EIO;
287 		}
288 	}
289 
290 	return 0;
291 }
292 
read_register_count(unsigned int * count)293 static int read_register_count(unsigned int *count)
294 {
295 	__be32 be;
296 	int ret;
297 
298 	ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
299 	if (ret)
300 		return ret;
301 
302 	*count = be32_to_cpu(be);
303 	return 0;
304 }
305 
306 /*
307  * Serialized I/O
308  *
309  * Returns zero on success or a negative error on failure.
310  * All functions below are concurrency safe - callers should NOT hold lock.
311  */
312 
applesmc_read_entry(const struct applesmc_entry * entry,u8 * buf,u8 len)313 static int applesmc_read_entry(const struct applesmc_entry *entry,
314 			       u8 *buf, u8 len)
315 {
316 	int ret;
317 
318 	if (entry->len != len)
319 		return -EINVAL;
320 	mutex_lock(&smcreg.mutex);
321 	ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
322 	mutex_unlock(&smcreg.mutex);
323 
324 	return ret;
325 }
326 
applesmc_write_entry(const struct applesmc_entry * entry,const u8 * buf,u8 len)327 static int applesmc_write_entry(const struct applesmc_entry *entry,
328 				const u8 *buf, u8 len)
329 {
330 	int ret;
331 
332 	if (entry->len != len)
333 		return -EINVAL;
334 	mutex_lock(&smcreg.mutex);
335 	ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
336 	mutex_unlock(&smcreg.mutex);
337 	return ret;
338 }
339 
applesmc_get_entry_by_index(int index)340 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
341 {
342 	struct applesmc_entry *cache = &smcreg.cache[index];
343 	u8 key[4], info[6];
344 	__be32 be;
345 	int ret = 0;
346 
347 	if (cache->valid)
348 		return cache;
349 
350 	mutex_lock(&smcreg.mutex);
351 
352 	if (cache->valid)
353 		goto out;
354 	be = cpu_to_be32(index);
355 	ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
356 	if (ret)
357 		goto out;
358 	ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
359 	if (ret)
360 		goto out;
361 
362 	memcpy(cache->key, key, 4);
363 	cache->len = info[0];
364 	memcpy(cache->type, &info[1], 4);
365 	cache->flags = info[5];
366 	cache->valid = 1;
367 
368 out:
369 	mutex_unlock(&smcreg.mutex);
370 	if (ret)
371 		return ERR_PTR(ret);
372 	return cache;
373 }
374 
applesmc_get_lower_bound(unsigned int * lo,const char * key)375 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
376 {
377 	int begin = 0, end = smcreg.key_count;
378 	const struct applesmc_entry *entry;
379 
380 	while (begin != end) {
381 		int middle = begin + (end - begin) / 2;
382 		entry = applesmc_get_entry_by_index(middle);
383 		if (IS_ERR(entry)) {
384 			*lo = 0;
385 			return PTR_ERR(entry);
386 		}
387 		if (strcmp(entry->key, key) < 0)
388 			begin = middle + 1;
389 		else
390 			end = middle;
391 	}
392 
393 	*lo = begin;
394 	return 0;
395 }
396 
applesmc_get_upper_bound(unsigned int * hi,const char * key)397 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
398 {
399 	int begin = 0, end = smcreg.key_count;
400 	const struct applesmc_entry *entry;
401 
402 	while (begin != end) {
403 		int middle = begin + (end - begin) / 2;
404 		entry = applesmc_get_entry_by_index(middle);
405 		if (IS_ERR(entry)) {
406 			*hi = smcreg.key_count;
407 			return PTR_ERR(entry);
408 		}
409 		if (strcmp(key, entry->key) < 0)
410 			end = middle;
411 		else
412 			begin = middle + 1;
413 	}
414 
415 	*hi = begin;
416 	return 0;
417 }
418 
applesmc_get_entry_by_key(const char * key)419 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
420 {
421 	int begin, end;
422 	int ret;
423 
424 	ret = applesmc_get_lower_bound(&begin, key);
425 	if (ret)
426 		return ERR_PTR(ret);
427 	ret = applesmc_get_upper_bound(&end, key);
428 	if (ret)
429 		return ERR_PTR(ret);
430 	if (end - begin != 1)
431 		return ERR_PTR(-EINVAL);
432 
433 	return applesmc_get_entry_by_index(begin);
434 }
435 
applesmc_read_key(const char * key,u8 * buffer,u8 len)436 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
437 {
438 	const struct applesmc_entry *entry;
439 
440 	entry = applesmc_get_entry_by_key(key);
441 	if (IS_ERR(entry))
442 		return PTR_ERR(entry);
443 
444 	return applesmc_read_entry(entry, buffer, len);
445 }
446 
applesmc_write_key(const char * key,const u8 * buffer,u8 len)447 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
448 {
449 	const struct applesmc_entry *entry;
450 
451 	entry = applesmc_get_entry_by_key(key);
452 	if (IS_ERR(entry))
453 		return PTR_ERR(entry);
454 
455 	return applesmc_write_entry(entry, buffer, len);
456 }
457 
applesmc_has_key(const char * key,bool * value)458 static int applesmc_has_key(const char *key, bool *value)
459 {
460 	const struct applesmc_entry *entry;
461 
462 	entry = applesmc_get_entry_by_key(key);
463 	if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
464 		return PTR_ERR(entry);
465 
466 	*value = !IS_ERR(entry);
467 	return 0;
468 }
469 
470 /*
471  * applesmc_read_s16 - Read 16-bit signed big endian register
472  */
applesmc_read_s16(const char * key,s16 * value)473 static int applesmc_read_s16(const char *key, s16 *value)
474 {
475 	u8 buffer[2];
476 	int ret;
477 
478 	ret = applesmc_read_key(key, buffer, 2);
479 	if (ret)
480 		return ret;
481 
482 	*value = ((s16)buffer[0] << 8) | buffer[1];
483 	return 0;
484 }
485 
486 /*
487  * applesmc_device_init - initialize the accelerometer.  Can sleep.
488  */
applesmc_device_init(void)489 static void applesmc_device_init(void)
490 {
491 	int total;
492 	u8 buffer[2];
493 
494 	if (!smcreg.has_accelerometer)
495 		return;
496 
497 	for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
498 		if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
499 				(buffer[0] != 0x00 || buffer[1] != 0x00))
500 			return;
501 		buffer[0] = 0xe0;
502 		buffer[1] = 0x00;
503 		applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
504 		msleep(INIT_WAIT_MSECS);
505 	}
506 
507 	pr_warn("failed to init the device\n");
508 }
509 
applesmc_init_index(struct applesmc_registers * s)510 static int applesmc_init_index(struct applesmc_registers *s)
511 {
512 	const struct applesmc_entry *entry;
513 	unsigned int i;
514 
515 	if (s->index)
516 		return 0;
517 
518 	s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
519 	if (!s->index)
520 		return -ENOMEM;
521 
522 	for (i = s->temp_begin; i < s->temp_end; i++) {
523 		entry = applesmc_get_entry_by_index(i);
524 		if (IS_ERR(entry))
525 			continue;
526 		if (strcmp(entry->type, TEMP_SENSOR_TYPE))
527 			continue;
528 		s->index[s->index_count++] = entry->key;
529 	}
530 
531 	return 0;
532 }
533 
534 /*
535  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
536  */
applesmc_init_smcreg_try(void)537 static int applesmc_init_smcreg_try(void)
538 {
539 	struct applesmc_registers *s = &smcreg;
540 	bool left_light_sensor, right_light_sensor;
541 	unsigned int count;
542 	u8 tmp[1];
543 	int ret;
544 
545 	if (s->init_complete)
546 		return 0;
547 
548 	ret = read_register_count(&count);
549 	if (ret)
550 		return ret;
551 
552 	if (s->cache && s->key_count != count) {
553 		pr_warn("key count changed from %d to %d\n",
554 			s->key_count, count);
555 		kfree(s->cache);
556 		s->cache = NULL;
557 	}
558 	s->key_count = count;
559 
560 	if (!s->cache)
561 		s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
562 	if (!s->cache)
563 		return -ENOMEM;
564 
565 	ret = applesmc_read_key(FANS_COUNT, tmp, 1);
566 	if (ret)
567 		return ret;
568 	s->fan_count = tmp[0];
569 
570 	ret = applesmc_get_lower_bound(&s->temp_begin, "T");
571 	if (ret)
572 		return ret;
573 	ret = applesmc_get_lower_bound(&s->temp_end, "U");
574 	if (ret)
575 		return ret;
576 	s->temp_count = s->temp_end - s->temp_begin;
577 
578 	ret = applesmc_init_index(s);
579 	if (ret)
580 		return ret;
581 
582 	ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
583 	if (ret)
584 		return ret;
585 	ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
586 	if (ret)
587 		return ret;
588 	ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
589 	if (ret)
590 		return ret;
591 	ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
592 	if (ret)
593 		return ret;
594 
595 	s->num_light_sensors = left_light_sensor + right_light_sensor;
596 	s->init_complete = true;
597 
598 	pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
599 	       s->key_count, s->fan_count, s->temp_count, s->index_count,
600 	       s->has_accelerometer,
601 	       s->num_light_sensors,
602 	       s->has_key_backlight);
603 
604 	return 0;
605 }
606 
applesmc_destroy_smcreg(void)607 static void applesmc_destroy_smcreg(void)
608 {
609 	kfree(smcreg.index);
610 	smcreg.index = NULL;
611 	kfree(smcreg.cache);
612 	smcreg.cache = NULL;
613 	smcreg.init_complete = false;
614 }
615 
616 /*
617  * applesmc_init_smcreg - Initialize register cache.
618  *
619  * Retries until initialization is successful, or the operation times out.
620  *
621  */
applesmc_init_smcreg(void)622 static int applesmc_init_smcreg(void)
623 {
624 	int ms, ret;
625 
626 	for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
627 		ret = applesmc_init_smcreg_try();
628 		if (!ret) {
629 			if (ms)
630 				pr_info("init_smcreg() took %d ms\n", ms);
631 			return 0;
632 		}
633 		msleep(INIT_WAIT_MSECS);
634 	}
635 
636 	applesmc_destroy_smcreg();
637 
638 	return ret;
639 }
640 
641 /* Device model stuff */
applesmc_probe(struct platform_device * dev)642 static int applesmc_probe(struct platform_device *dev)
643 {
644 	int ret;
645 
646 	ret = applesmc_init_smcreg();
647 	if (ret)
648 		return ret;
649 
650 	applesmc_device_init();
651 
652 	return 0;
653 }
654 
655 /* Synchronize device with memorized backlight state */
applesmc_pm_resume(struct device * dev)656 static int applesmc_pm_resume(struct device *dev)
657 {
658 	if (smcreg.has_key_backlight)
659 		applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
660 	return 0;
661 }
662 
663 /* Reinitialize device on resume from hibernation */
applesmc_pm_restore(struct device * dev)664 static int applesmc_pm_restore(struct device *dev)
665 {
666 	applesmc_device_init();
667 	return applesmc_pm_resume(dev);
668 }
669 
670 static const struct dev_pm_ops applesmc_pm_ops = {
671 	.resume = applesmc_pm_resume,
672 	.restore = applesmc_pm_restore,
673 };
674 
675 static struct platform_driver applesmc_driver = {
676 	.probe = applesmc_probe,
677 	.driver	= {
678 		.name = "applesmc",
679 		.owner = THIS_MODULE,
680 		.pm = &applesmc_pm_ops,
681 	},
682 };
683 
684 /*
685  * applesmc_calibrate - Set our "resting" values.  Callers must
686  * hold applesmc_lock.
687  */
applesmc_calibrate(void)688 static void applesmc_calibrate(void)
689 {
690 	applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
691 	applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
692 	rest_x = -rest_x;
693 }
694 
applesmc_idev_poll(struct input_polled_dev * dev)695 static void applesmc_idev_poll(struct input_polled_dev *dev)
696 {
697 	struct input_dev *idev = dev->input;
698 	s16 x, y;
699 
700 	if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
701 		return;
702 	if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
703 		return;
704 
705 	x = -x;
706 	input_report_abs(idev, ABS_X, x - rest_x);
707 	input_report_abs(idev, ABS_Y, y - rest_y);
708 	input_sync(idev);
709 }
710 
711 /* Sysfs Files */
712 
applesmc_name_show(struct device * dev,struct device_attribute * attr,char * buf)713 static ssize_t applesmc_name_show(struct device *dev,
714 				   struct device_attribute *attr, char *buf)
715 {
716 	return snprintf(buf, PAGE_SIZE, "applesmc\n");
717 }
718 
applesmc_position_show(struct device * dev,struct device_attribute * attr,char * buf)719 static ssize_t applesmc_position_show(struct device *dev,
720 				   struct device_attribute *attr, char *buf)
721 {
722 	int ret;
723 	s16 x, y, z;
724 
725 	ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
726 	if (ret)
727 		goto out;
728 	ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
729 	if (ret)
730 		goto out;
731 	ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
732 	if (ret)
733 		goto out;
734 
735 out:
736 	if (ret)
737 		return ret;
738 	else
739 		return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
740 }
741 
applesmc_light_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)742 static ssize_t applesmc_light_show(struct device *dev,
743 				struct device_attribute *attr, char *sysfsbuf)
744 {
745 	const struct applesmc_entry *entry;
746 	static int data_length;
747 	int ret;
748 	u8 left = 0, right = 0;
749 	u8 buffer[10];
750 
751 	if (!data_length) {
752 		entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
753 		if (IS_ERR(entry))
754 			return PTR_ERR(entry);
755 		if (entry->len > 10)
756 			return -ENXIO;
757 		data_length = entry->len;
758 		pr_info("light sensor data length set to %d\n", data_length);
759 	}
760 
761 	ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
762 	/* newer macbooks report a single 10-bit bigendian value */
763 	if (data_length == 10) {
764 		left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
765 		goto out;
766 	}
767 	left = buffer[2];
768 	if (ret)
769 		goto out;
770 	ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
771 	right = buffer[2];
772 
773 out:
774 	if (ret)
775 		return ret;
776 	else
777 		return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
778 }
779 
780 /* Displays sensor key as label */
applesmc_show_sensor_label(struct device * dev,struct device_attribute * devattr,char * sysfsbuf)781 static ssize_t applesmc_show_sensor_label(struct device *dev,
782 			struct device_attribute *devattr, char *sysfsbuf)
783 {
784 	const char *key = smcreg.index[to_index(devattr)];
785 
786 	return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
787 }
788 
789 /* Displays degree Celsius * 1000 */
applesmc_show_temperature(struct device * dev,struct device_attribute * devattr,char * sysfsbuf)790 static ssize_t applesmc_show_temperature(struct device *dev,
791 			struct device_attribute *devattr, char *sysfsbuf)
792 {
793 	const char *key = smcreg.index[to_index(devattr)];
794 	int ret;
795 	s16 value;
796 	int temp;
797 
798 	ret = applesmc_read_s16(key, &value);
799 	if (ret)
800 		return ret;
801 
802 	temp = 250 * (value >> 6);
803 
804 	return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
805 }
806 
applesmc_show_fan_speed(struct device * dev,struct device_attribute * attr,char * sysfsbuf)807 static ssize_t applesmc_show_fan_speed(struct device *dev,
808 				struct device_attribute *attr, char *sysfsbuf)
809 {
810 	int ret;
811 	unsigned int speed = 0;
812 	char newkey[5];
813 	u8 buffer[2];
814 
815 	sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
816 
817 	ret = applesmc_read_key(newkey, buffer, 2);
818 	speed = ((buffer[0] << 8 | buffer[1]) >> 2);
819 
820 	if (ret)
821 		return ret;
822 	else
823 		return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
824 }
825 
applesmc_store_fan_speed(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)826 static ssize_t applesmc_store_fan_speed(struct device *dev,
827 					struct device_attribute *attr,
828 					const char *sysfsbuf, size_t count)
829 {
830 	int ret;
831 	unsigned long speed;
832 	char newkey[5];
833 	u8 buffer[2];
834 
835 	if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
836 		return -EINVAL;		/* Bigger than a 14-bit value */
837 
838 	sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
839 
840 	buffer[0] = (speed >> 6) & 0xff;
841 	buffer[1] = (speed << 2) & 0xff;
842 	ret = applesmc_write_key(newkey, buffer, 2);
843 
844 	if (ret)
845 		return ret;
846 	else
847 		return count;
848 }
849 
applesmc_show_fan_manual(struct device * dev,struct device_attribute * attr,char * sysfsbuf)850 static ssize_t applesmc_show_fan_manual(struct device *dev,
851 			struct device_attribute *attr, char *sysfsbuf)
852 {
853 	int ret;
854 	u16 manual = 0;
855 	u8 buffer[2];
856 
857 	ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
858 	manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
859 
860 	if (ret)
861 		return ret;
862 	else
863 		return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
864 }
865 
applesmc_store_fan_manual(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)866 static ssize_t applesmc_store_fan_manual(struct device *dev,
867 					 struct device_attribute *attr,
868 					 const char *sysfsbuf, size_t count)
869 {
870 	int ret;
871 	u8 buffer[2];
872 	unsigned long input;
873 	u16 val;
874 
875 	if (kstrtoul(sysfsbuf, 10, &input) < 0)
876 		return -EINVAL;
877 
878 	ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
879 	val = (buffer[0] << 8 | buffer[1]);
880 	if (ret)
881 		goto out;
882 
883 	if (input)
884 		val = val | (0x01 << to_index(attr));
885 	else
886 		val = val & ~(0x01 << to_index(attr));
887 
888 	buffer[0] = (val >> 8) & 0xFF;
889 	buffer[1] = val & 0xFF;
890 
891 	ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
892 
893 out:
894 	if (ret)
895 		return ret;
896 	else
897 		return count;
898 }
899 
applesmc_show_fan_position(struct device * dev,struct device_attribute * attr,char * sysfsbuf)900 static ssize_t applesmc_show_fan_position(struct device *dev,
901 				struct device_attribute *attr, char *sysfsbuf)
902 {
903 	int ret;
904 	char newkey[5];
905 	u8 buffer[17];
906 
907 	sprintf(newkey, FAN_ID_FMT, to_index(attr));
908 
909 	ret = applesmc_read_key(newkey, buffer, 16);
910 	buffer[16] = 0;
911 
912 	if (ret)
913 		return ret;
914 	else
915 		return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
916 }
917 
applesmc_calibrate_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)918 static ssize_t applesmc_calibrate_show(struct device *dev,
919 				struct device_attribute *attr, char *sysfsbuf)
920 {
921 	return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
922 }
923 
applesmc_calibrate_store(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)924 static ssize_t applesmc_calibrate_store(struct device *dev,
925 	struct device_attribute *attr, const char *sysfsbuf, size_t count)
926 {
927 	applesmc_calibrate();
928 
929 	return count;
930 }
931 
applesmc_backlight_set(struct work_struct * work)932 static void applesmc_backlight_set(struct work_struct *work)
933 {
934 	applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
935 }
936 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
937 
applesmc_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)938 static void applesmc_brightness_set(struct led_classdev *led_cdev,
939 						enum led_brightness value)
940 {
941 	int ret;
942 
943 	backlight_state[0] = value;
944 	ret = queue_work(applesmc_led_wq, &backlight_work);
945 
946 	if (debug && (!ret))
947 		dev_dbg(led_cdev->dev, "work was already on the queue.\n");
948 }
949 
applesmc_key_count_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)950 static ssize_t applesmc_key_count_show(struct device *dev,
951 				struct device_attribute *attr, char *sysfsbuf)
952 {
953 	int ret;
954 	u8 buffer[4];
955 	u32 count;
956 
957 	ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
958 	count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
959 						((u32)buffer[2]<<8) + buffer[3];
960 
961 	if (ret)
962 		return ret;
963 	else
964 		return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
965 }
966 
applesmc_key_at_index_read_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)967 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
968 				struct device_attribute *attr, char *sysfsbuf)
969 {
970 	const struct applesmc_entry *entry;
971 	int ret;
972 
973 	entry = applesmc_get_entry_by_index(key_at_index);
974 	if (IS_ERR(entry))
975 		return PTR_ERR(entry);
976 	ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
977 	if (ret)
978 		return ret;
979 
980 	return entry->len;
981 }
982 
applesmc_key_at_index_data_length_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)983 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
984 				struct device_attribute *attr, char *sysfsbuf)
985 {
986 	const struct applesmc_entry *entry;
987 
988 	entry = applesmc_get_entry_by_index(key_at_index);
989 	if (IS_ERR(entry))
990 		return PTR_ERR(entry);
991 
992 	return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
993 }
994 
applesmc_key_at_index_type_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)995 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
996 				struct device_attribute *attr, char *sysfsbuf)
997 {
998 	const struct applesmc_entry *entry;
999 
1000 	entry = applesmc_get_entry_by_index(key_at_index);
1001 	if (IS_ERR(entry))
1002 		return PTR_ERR(entry);
1003 
1004 	return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
1005 }
1006 
applesmc_key_at_index_name_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)1007 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
1008 				struct device_attribute *attr, char *sysfsbuf)
1009 {
1010 	const struct applesmc_entry *entry;
1011 
1012 	entry = applesmc_get_entry_by_index(key_at_index);
1013 	if (IS_ERR(entry))
1014 		return PTR_ERR(entry);
1015 
1016 	return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
1017 }
1018 
applesmc_key_at_index_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)1019 static ssize_t applesmc_key_at_index_show(struct device *dev,
1020 				struct device_attribute *attr, char *sysfsbuf)
1021 {
1022 	return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
1023 }
1024 
applesmc_key_at_index_store(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)1025 static ssize_t applesmc_key_at_index_store(struct device *dev,
1026 	struct device_attribute *attr, const char *sysfsbuf, size_t count)
1027 {
1028 	unsigned long newkey;
1029 
1030 	if (kstrtoul(sysfsbuf, 10, &newkey) < 0
1031 	    || newkey >= smcreg.key_count)
1032 		return -EINVAL;
1033 
1034 	key_at_index = newkey;
1035 	return count;
1036 }
1037 
1038 static struct led_classdev applesmc_backlight = {
1039 	.name			= "smc::kbd_backlight",
1040 	.default_trigger	= "nand-disk",
1041 	.brightness_set		= applesmc_brightness_set,
1042 };
1043 
1044 static struct applesmc_node_group info_group[] = {
1045 	{ "name", applesmc_name_show },
1046 	{ "key_count", applesmc_key_count_show },
1047 	{ "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1048 	{ "key_at_index_name", applesmc_key_at_index_name_show },
1049 	{ "key_at_index_type", applesmc_key_at_index_type_show },
1050 	{ "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1051 	{ "key_at_index_data", applesmc_key_at_index_read_show },
1052 	{ }
1053 };
1054 
1055 static struct applesmc_node_group accelerometer_group[] = {
1056 	{ "position", applesmc_position_show },
1057 	{ "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1058 	{ }
1059 };
1060 
1061 static struct applesmc_node_group light_sensor_group[] = {
1062 	{ "light", applesmc_light_show },
1063 	{ }
1064 };
1065 
1066 static struct applesmc_node_group fan_group[] = {
1067 	{ "fan%d_label", applesmc_show_fan_position },
1068 	{ "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1069 	{ "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1070 	{ "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1071 	{ "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1072 	{ "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1073 	{ "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1074 	{ }
1075 };
1076 
1077 static struct applesmc_node_group temp_group[] = {
1078 	{ "temp%d_label", applesmc_show_sensor_label },
1079 	{ "temp%d_input", applesmc_show_temperature },
1080 	{ }
1081 };
1082 
1083 /* Module stuff */
1084 
1085 /*
1086  * applesmc_destroy_nodes - remove files and free associated memory
1087  */
applesmc_destroy_nodes(struct applesmc_node_group * groups)1088 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1089 {
1090 	struct applesmc_node_group *grp;
1091 	struct applesmc_dev_attr *node;
1092 
1093 	for (grp = groups; grp->nodes; grp++) {
1094 		for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1095 			sysfs_remove_file(&pdev->dev.kobj,
1096 					  &node->sda.dev_attr.attr);
1097 		kfree(grp->nodes);
1098 		grp->nodes = NULL;
1099 	}
1100 }
1101 
1102 /*
1103  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1104  */
applesmc_create_nodes(struct applesmc_node_group * groups,int num)1105 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1106 {
1107 	struct applesmc_node_group *grp;
1108 	struct applesmc_dev_attr *node;
1109 	struct attribute *attr;
1110 	int ret, i;
1111 
1112 	for (grp = groups; grp->format; grp++) {
1113 		grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1114 		if (!grp->nodes) {
1115 			ret = -ENOMEM;
1116 			goto out;
1117 		}
1118 		for (i = 0; i < num; i++) {
1119 			node = &grp->nodes[i];
1120 			sprintf(node->name, grp->format, i + 1);
1121 			node->sda.index = (grp->option << 16) | (i & 0xffff);
1122 			node->sda.dev_attr.show = grp->show;
1123 			node->sda.dev_attr.store = grp->store;
1124 			attr = &node->sda.dev_attr.attr;
1125 			sysfs_attr_init(attr);
1126 			attr->name = node->name;
1127 			attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1128 			ret = sysfs_create_file(&pdev->dev.kobj, attr);
1129 			if (ret) {
1130 				attr->name = NULL;
1131 				goto out;
1132 			}
1133 		}
1134 	}
1135 
1136 	return 0;
1137 out:
1138 	applesmc_destroy_nodes(groups);
1139 	return ret;
1140 }
1141 
1142 /* Create accelerometer ressources */
applesmc_create_accelerometer(void)1143 static int applesmc_create_accelerometer(void)
1144 {
1145 	struct input_dev *idev;
1146 	int ret;
1147 
1148 	if (!smcreg.has_accelerometer)
1149 		return 0;
1150 
1151 	ret = applesmc_create_nodes(accelerometer_group, 1);
1152 	if (ret)
1153 		goto out;
1154 
1155 	applesmc_idev = input_allocate_polled_device();
1156 	if (!applesmc_idev) {
1157 		ret = -ENOMEM;
1158 		goto out_sysfs;
1159 	}
1160 
1161 	applesmc_idev->poll = applesmc_idev_poll;
1162 	applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1163 
1164 	/* initial calibrate for the input device */
1165 	applesmc_calibrate();
1166 
1167 	/* initialize the input device */
1168 	idev = applesmc_idev->input;
1169 	idev->name = "applesmc";
1170 	idev->id.bustype = BUS_HOST;
1171 	idev->dev.parent = &pdev->dev;
1172 	idev->evbit[0] = BIT_MASK(EV_ABS);
1173 	input_set_abs_params(idev, ABS_X,
1174 			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1175 	input_set_abs_params(idev, ABS_Y,
1176 			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1177 
1178 	ret = input_register_polled_device(applesmc_idev);
1179 	if (ret)
1180 		goto out_idev;
1181 
1182 	return 0;
1183 
1184 out_idev:
1185 	input_free_polled_device(applesmc_idev);
1186 
1187 out_sysfs:
1188 	applesmc_destroy_nodes(accelerometer_group);
1189 
1190 out:
1191 	pr_warn("driver init failed (ret=%d)!\n", ret);
1192 	return ret;
1193 }
1194 
1195 /* Release all ressources used by the accelerometer */
applesmc_release_accelerometer(void)1196 static void applesmc_release_accelerometer(void)
1197 {
1198 	if (!smcreg.has_accelerometer)
1199 		return;
1200 	input_unregister_polled_device(applesmc_idev);
1201 	input_free_polled_device(applesmc_idev);
1202 	applesmc_destroy_nodes(accelerometer_group);
1203 }
1204 
applesmc_create_light_sensor(void)1205 static int applesmc_create_light_sensor(void)
1206 {
1207 	if (!smcreg.num_light_sensors)
1208 		return 0;
1209 	return applesmc_create_nodes(light_sensor_group, 1);
1210 }
1211 
applesmc_release_light_sensor(void)1212 static void applesmc_release_light_sensor(void)
1213 {
1214 	if (!smcreg.num_light_sensors)
1215 		return;
1216 	applesmc_destroy_nodes(light_sensor_group);
1217 }
1218 
applesmc_create_key_backlight(void)1219 static int applesmc_create_key_backlight(void)
1220 {
1221 	if (!smcreg.has_key_backlight)
1222 		return 0;
1223 	applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1224 	if (!applesmc_led_wq)
1225 		return -ENOMEM;
1226 	return led_classdev_register(&pdev->dev, &applesmc_backlight);
1227 }
1228 
applesmc_release_key_backlight(void)1229 static void applesmc_release_key_backlight(void)
1230 {
1231 	if (!smcreg.has_key_backlight)
1232 		return;
1233 	led_classdev_unregister(&applesmc_backlight);
1234 	destroy_workqueue(applesmc_led_wq);
1235 }
1236 
applesmc_dmi_match(const struct dmi_system_id * id)1237 static int applesmc_dmi_match(const struct dmi_system_id *id)
1238 {
1239 	return 1;
1240 }
1241 
1242 /*
1243  * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1244  * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1245  */
1246 static __initdata struct dmi_system_id applesmc_whitelist[] = {
1247 	{ applesmc_dmi_match, "Apple MacBook Air", {
1248 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1249 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1250 	},
1251 	{ applesmc_dmi_match, "Apple MacBook Pro", {
1252 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1253 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1254 	},
1255 	{ applesmc_dmi_match, "Apple MacBook", {
1256 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1257 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1258 	},
1259 	{ applesmc_dmi_match, "Apple Macmini", {
1260 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1261 	  DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1262 	},
1263 	{ applesmc_dmi_match, "Apple MacPro", {
1264 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1265 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1266 	},
1267 	{ applesmc_dmi_match, "Apple iMac", {
1268 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1269 	  DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1270 	},
1271 	{ .ident = NULL }
1272 };
1273 
applesmc_init(void)1274 static int __init applesmc_init(void)
1275 {
1276 	int ret;
1277 
1278 	if (!dmi_check_system(applesmc_whitelist)) {
1279 		pr_warn("supported laptop not found!\n");
1280 		ret = -ENODEV;
1281 		goto out;
1282 	}
1283 
1284 	if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1285 								"applesmc")) {
1286 		ret = -ENXIO;
1287 		goto out;
1288 	}
1289 
1290 	ret = platform_driver_register(&applesmc_driver);
1291 	if (ret)
1292 		goto out_region;
1293 
1294 	pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1295 					       NULL, 0);
1296 	if (IS_ERR(pdev)) {
1297 		ret = PTR_ERR(pdev);
1298 		goto out_driver;
1299 	}
1300 
1301 	/* create register cache */
1302 	ret = applesmc_init_smcreg();
1303 	if (ret)
1304 		goto out_device;
1305 
1306 	ret = applesmc_create_nodes(info_group, 1);
1307 	if (ret)
1308 		goto out_smcreg;
1309 
1310 	ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1311 	if (ret)
1312 		goto out_info;
1313 
1314 	ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1315 	if (ret)
1316 		goto out_fans;
1317 
1318 	ret = applesmc_create_accelerometer();
1319 	if (ret)
1320 		goto out_temperature;
1321 
1322 	ret = applesmc_create_light_sensor();
1323 	if (ret)
1324 		goto out_accelerometer;
1325 
1326 	ret = applesmc_create_key_backlight();
1327 	if (ret)
1328 		goto out_light_sysfs;
1329 
1330 	hwmon_dev = hwmon_device_register(&pdev->dev);
1331 	if (IS_ERR(hwmon_dev)) {
1332 		ret = PTR_ERR(hwmon_dev);
1333 		goto out_light_ledclass;
1334 	}
1335 
1336 	return 0;
1337 
1338 out_light_ledclass:
1339 	applesmc_release_key_backlight();
1340 out_light_sysfs:
1341 	applesmc_release_light_sensor();
1342 out_accelerometer:
1343 	applesmc_release_accelerometer();
1344 out_temperature:
1345 	applesmc_destroy_nodes(temp_group);
1346 out_fans:
1347 	applesmc_destroy_nodes(fan_group);
1348 out_info:
1349 	applesmc_destroy_nodes(info_group);
1350 out_smcreg:
1351 	applesmc_destroy_smcreg();
1352 out_device:
1353 	platform_device_unregister(pdev);
1354 out_driver:
1355 	platform_driver_unregister(&applesmc_driver);
1356 out_region:
1357 	release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1358 out:
1359 	pr_warn("driver init failed (ret=%d)!\n", ret);
1360 	return ret;
1361 }
1362 
applesmc_exit(void)1363 static void __exit applesmc_exit(void)
1364 {
1365 	hwmon_device_unregister(hwmon_dev);
1366 	applesmc_release_key_backlight();
1367 	applesmc_release_light_sensor();
1368 	applesmc_release_accelerometer();
1369 	applesmc_destroy_nodes(temp_group);
1370 	applesmc_destroy_nodes(fan_group);
1371 	applesmc_destroy_nodes(info_group);
1372 	applesmc_destroy_smcreg();
1373 	platform_device_unregister(pdev);
1374 	platform_driver_unregister(&applesmc_driver);
1375 	release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1376 }
1377 
1378 module_init(applesmc_init);
1379 module_exit(applesmc_exit);
1380 
1381 MODULE_AUTHOR("Nicolas Boichat");
1382 MODULE_DESCRIPTION("Apple SMC");
1383 MODULE_LICENSE("GPL v2");
1384 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);
1385