1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
4  * sensors, fan control, keyboard backlight control) used in Intel-based Apple
5  * computers.
6  *
7  * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
8  * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
9  *
10  * Based on hdaps.c driver:
11  * Copyright (C) 2005 Robert Love <rml@novell.com>
12  * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
13  *
14  * Fan control based on smcFanControl:
15  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
16  */
17 
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 
20 #include <linux/delay.h>
21 #include <linux/platform_device.h>
22 #include <linux/input.h>
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <linux/timer.h>
27 #include <linux/dmi.h>
28 #include <linux/mutex.h>
29 #include <linux/hwmon-sysfs.h>
30 #include <linux/io.h>
31 #include <linux/leds.h>
32 #include <linux/hwmon.h>
33 #include <linux/workqueue.h>
34 #include <linux/err.h>
35 #include <linux/bits.h>
36 
37 /* data port used by Apple SMC */
38 #define APPLESMC_DATA_PORT	0x300
39 /* command/status port used by Apple SMC */
40 #define APPLESMC_CMD_PORT	0x304
41 
42 #define APPLESMC_NR_PORTS	32 /* 0x300-0x31f */
43 
44 #define APPLESMC_MAX_DATA_LENGTH 32
45 
46 /* Apple SMC status bits */
47 #define SMC_STATUS_AWAITING_DATA  BIT(0) /* SMC has data waiting to be read */
48 #define SMC_STATUS_IB_CLOSED      BIT(1) /* Will ignore any input */
49 #define SMC_STATUS_BUSY           BIT(2) /* Command in progress */
50 
51 /* Initial wait is 8us */
52 #define APPLESMC_MIN_WAIT      0x0008
53 
54 #define APPLESMC_READ_CMD	0x10
55 #define APPLESMC_WRITE_CMD	0x11
56 #define APPLESMC_GET_KEY_BY_INDEX_CMD	0x12
57 #define APPLESMC_GET_KEY_TYPE_CMD	0x13
58 
59 #define KEY_COUNT_KEY		"#KEY" /* r-o ui32 */
60 
61 #define LIGHT_SENSOR_LEFT_KEY	"ALV0" /* r-o {alv (6-10 bytes) */
62 #define LIGHT_SENSOR_RIGHT_KEY	"ALV1" /* r-o {alv (6-10 bytes) */
63 #define BACKLIGHT_KEY		"LKSB" /* w-o {lkb (2 bytes) */
64 
65 #define CLAMSHELL_KEY		"MSLD" /* r-o ui8 (unused) */
66 
67 #define MOTION_SENSOR_X_KEY	"MO_X" /* r-o sp78 (2 bytes) */
68 #define MOTION_SENSOR_Y_KEY	"MO_Y" /* r-o sp78 (2 bytes) */
69 #define MOTION_SENSOR_Z_KEY	"MO_Z" /* r-o sp78 (2 bytes) */
70 #define MOTION_SENSOR_KEY	"MOCN" /* r/w ui16 */
71 
72 #define FANS_COUNT		"FNum" /* r-o ui8 */
73 #define FANS_MANUAL		"FS! " /* r-w ui16 */
74 #define FAN_ID_FMT		"F%dID" /* r-o char[16] */
75 
76 #define TEMP_SENSOR_TYPE	"sp78"
77 
78 /* List of keys used to read/write fan speeds */
79 static const char *const fan_speed_fmt[] = {
80 	"F%dAc",		/* actual speed */
81 	"F%dMn",		/* minimum speed (rw) */
82 	"F%dMx",		/* maximum speed */
83 	"F%dSf",		/* safe speed - not all models */
84 	"F%dTg",		/* target speed (manual: rw) */
85 };
86 
87 #define INIT_TIMEOUT_MSECS	5000	/* wait up to 5s for device init ... */
88 #define INIT_WAIT_MSECS		50	/* ... in 50ms increments */
89 
90 #define APPLESMC_POLL_INTERVAL	50	/* msecs */
91 #define APPLESMC_INPUT_FUZZ	4	/* input event threshold */
92 #define APPLESMC_INPUT_FLAT	4
93 
94 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
95 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
96 
97 /* Dynamic device node attributes */
98 struct applesmc_dev_attr {
99 	struct sensor_device_attribute sda;	/* hwmon attributes */
100 	char name[32];				/* room for node file name */
101 };
102 
103 /* Dynamic device node group */
104 struct applesmc_node_group {
105 	char *format;				/* format string */
106 	void *show;				/* show function */
107 	void *store;				/* store function */
108 	int option;				/* function argument */
109 	struct applesmc_dev_attr *nodes;	/* dynamic node array */
110 };
111 
112 /* AppleSMC entry - cached register information */
113 struct applesmc_entry {
114 	char key[5];		/* four-letter key code */
115 	u8 valid;		/* set when entry is successfully read once */
116 	u8 len;			/* bounded by APPLESMC_MAX_DATA_LENGTH */
117 	char type[5];		/* four-letter type code */
118 	u8 flags;		/* 0x10: func; 0x40: write; 0x80: read */
119 };
120 
121 /* Register lookup and registers common to all SMCs */
122 static struct applesmc_registers {
123 	struct mutex mutex;		/* register read/write mutex */
124 	unsigned int key_count;		/* number of SMC registers */
125 	unsigned int fan_count;		/* number of fans */
126 	unsigned int temp_count;	/* number of temperature registers */
127 	unsigned int temp_begin;	/* temperature lower index bound */
128 	unsigned int temp_end;		/* temperature upper index bound */
129 	unsigned int index_count;	/* size of temperature index array */
130 	int num_light_sensors;		/* number of light sensors */
131 	bool has_accelerometer;		/* has motion sensor */
132 	bool has_key_backlight;		/* has keyboard backlight */
133 	bool init_complete;		/* true when fully initialized */
134 	struct applesmc_entry *cache;	/* cached key entries */
135 	const char **index;		/* temperature key index */
136 } smcreg = {
137 	.mutex = __MUTEX_INITIALIZER(smcreg.mutex),
138 };
139 
140 static const int debug;
141 static struct platform_device *pdev;
142 static s16 rest_x;
143 static s16 rest_y;
144 static u8 backlight_state[2];
145 
146 static struct device *hwmon_dev;
147 static struct input_dev *applesmc_idev;
148 
149 /*
150  * Last index written to key_at_index sysfs file, and value to use for all other
151  * key_at_index_* sysfs files.
152  */
153 static unsigned int key_at_index;
154 
155 static struct workqueue_struct *applesmc_led_wq;
156 
157 /*
158  * Wait for specific status bits with a mask on the SMC.
159  * Used before all transactions.
160  * This does 10 fast loops of 8us then exponentially backs off for a
161  * minimum total wait of 262ms. Depending on usleep_range this could
162  * run out past 500ms.
163  */
164 
wait_status(u8 val,u8 mask)165 static int wait_status(u8 val, u8 mask)
166 {
167 	u8 status;
168 	int us;
169 	int i;
170 
171 	us = APPLESMC_MIN_WAIT;
172 	for (i = 0; i < 24 ; i++) {
173 		status = inb(APPLESMC_CMD_PORT);
174 		if ((status & mask) == val)
175 			return 0;
176 		usleep_range(us, us * 2);
177 		if (i > 9)
178 			us <<= 1;
179 	}
180 	return -EIO;
181 }
182 
183 /* send_byte - Write to SMC data port. Callers must hold applesmc_lock. */
184 
send_byte(u8 cmd,u16 port)185 static int send_byte(u8 cmd, u16 port)
186 {
187 	int status;
188 
189 	status = wait_status(0, SMC_STATUS_IB_CLOSED);
190 	if (status)
191 		return status;
192 	/*
193 	 * This needs to be a separate read looking for bit 0x04
194 	 * after bit 0x02 falls. If consolidated with the wait above
195 	 * this extra read may not happen if status returns both
196 	 * simultaneously and this would appear to be required.
197 	 */
198 	status = wait_status(SMC_STATUS_BUSY, SMC_STATUS_BUSY);
199 	if (status)
200 		return status;
201 
202 	outb(cmd, port);
203 	return 0;
204 }
205 
206 /* send_command - Write a command to the SMC. Callers must hold applesmc_lock. */
207 
send_command(u8 cmd)208 static int send_command(u8 cmd)
209 {
210 	int ret;
211 
212 	ret = wait_status(0, SMC_STATUS_IB_CLOSED);
213 	if (ret)
214 		return ret;
215 	outb(cmd, APPLESMC_CMD_PORT);
216 	return 0;
217 }
218 
219 /*
220  * Based on logic from the Apple driver. This is issued before any interaction
221  * If busy is stuck high, issue a read command to reset the SMC state machine.
222  * If busy is stuck high after the command then the SMC is jammed.
223  */
224 
smc_sane(void)225 static int smc_sane(void)
226 {
227 	int ret;
228 
229 	ret = wait_status(0, SMC_STATUS_BUSY);
230 	if (!ret)
231 		return ret;
232 	ret = send_command(APPLESMC_READ_CMD);
233 	if (ret)
234 		return ret;
235 	return wait_status(0, SMC_STATUS_BUSY);
236 }
237 
send_argument(const char * key)238 static int send_argument(const char *key)
239 {
240 	int i;
241 
242 	for (i = 0; i < 4; i++)
243 		if (send_byte(key[i], APPLESMC_DATA_PORT))
244 			return -EIO;
245 	return 0;
246 }
247 
read_smc(u8 cmd,const char * key,u8 * buffer,u8 len)248 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
249 {
250 	u8 status, data = 0;
251 	int i;
252 	int ret;
253 
254 	ret = smc_sane();
255 	if (ret)
256 		return ret;
257 
258 	if (send_command(cmd) || send_argument(key)) {
259 		pr_warn("%.4s: read arg fail\n", key);
260 		return -EIO;
261 	}
262 
263 	/* This has no effect on newer (2012) SMCs */
264 	if (send_byte(len, APPLESMC_DATA_PORT)) {
265 		pr_warn("%.4s: read len fail\n", key);
266 		return -EIO;
267 	}
268 
269 	for (i = 0; i < len; i++) {
270 		if (wait_status(SMC_STATUS_AWAITING_DATA | SMC_STATUS_BUSY,
271 				SMC_STATUS_AWAITING_DATA | SMC_STATUS_BUSY)) {
272 			pr_warn("%.4s: read data[%d] fail\n", key, i);
273 			return -EIO;
274 		}
275 		buffer[i] = inb(APPLESMC_DATA_PORT);
276 	}
277 
278 	/* Read the data port until bit0 is cleared */
279 	for (i = 0; i < 16; i++) {
280 		udelay(APPLESMC_MIN_WAIT);
281 		status = inb(APPLESMC_CMD_PORT);
282 		if (!(status & SMC_STATUS_AWAITING_DATA))
283 			break;
284 		data = inb(APPLESMC_DATA_PORT);
285 	}
286 	if (i)
287 		pr_warn("flushed %d bytes, last value is: %d\n", i, data);
288 
289 	return wait_status(0, SMC_STATUS_BUSY);
290 }
291 
write_smc(u8 cmd,const char * key,const u8 * buffer,u8 len)292 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
293 {
294 	int i;
295 	int ret;
296 
297 	ret = smc_sane();
298 	if (ret)
299 		return ret;
300 
301 	if (send_command(cmd) || send_argument(key)) {
302 		pr_warn("%s: write arg fail\n", key);
303 		return -EIO;
304 	}
305 
306 	if (send_byte(len, APPLESMC_DATA_PORT)) {
307 		pr_warn("%.4s: write len fail\n", key);
308 		return -EIO;
309 	}
310 
311 	for (i = 0; i < len; i++) {
312 		if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
313 			pr_warn("%s: write data fail\n", key);
314 			return -EIO;
315 		}
316 	}
317 
318 	return wait_status(0, SMC_STATUS_BUSY);
319 }
320 
read_register_count(unsigned int * count)321 static int read_register_count(unsigned int *count)
322 {
323 	__be32 be;
324 	int ret;
325 
326 	ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
327 	if (ret)
328 		return ret;
329 
330 	*count = be32_to_cpu(be);
331 	return 0;
332 }
333 
334 /*
335  * Serialized I/O
336  *
337  * Returns zero on success or a negative error on failure.
338  * All functions below are concurrency safe - callers should NOT hold lock.
339  */
340 
applesmc_read_entry(const struct applesmc_entry * entry,u8 * buf,u8 len)341 static int applesmc_read_entry(const struct applesmc_entry *entry,
342 			       u8 *buf, u8 len)
343 {
344 	int ret;
345 
346 	if (entry->len != len)
347 		return -EINVAL;
348 	mutex_lock(&smcreg.mutex);
349 	ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
350 	mutex_unlock(&smcreg.mutex);
351 
352 	return ret;
353 }
354 
applesmc_write_entry(const struct applesmc_entry * entry,const u8 * buf,u8 len)355 static int applesmc_write_entry(const struct applesmc_entry *entry,
356 				const u8 *buf, u8 len)
357 {
358 	int ret;
359 
360 	if (entry->len != len)
361 		return -EINVAL;
362 	mutex_lock(&smcreg.mutex);
363 	ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
364 	mutex_unlock(&smcreg.mutex);
365 	return ret;
366 }
367 
applesmc_get_entry_by_index(int index)368 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
369 {
370 	struct applesmc_entry *cache = &smcreg.cache[index];
371 	u8 key[4], info[6];
372 	__be32 be;
373 	int ret = 0;
374 
375 	if (cache->valid)
376 		return cache;
377 
378 	mutex_lock(&smcreg.mutex);
379 
380 	if (cache->valid)
381 		goto out;
382 	be = cpu_to_be32(index);
383 	ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
384 	if (ret)
385 		goto out;
386 	ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
387 	if (ret)
388 		goto out;
389 
390 	memcpy(cache->key, key, 4);
391 	cache->len = info[0];
392 	memcpy(cache->type, &info[1], 4);
393 	cache->flags = info[5];
394 	cache->valid = true;
395 
396 out:
397 	mutex_unlock(&smcreg.mutex);
398 	if (ret)
399 		return ERR_PTR(ret);
400 	return cache;
401 }
402 
applesmc_get_lower_bound(unsigned int * lo,const char * key)403 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
404 {
405 	int begin = 0, end = smcreg.key_count;
406 	const struct applesmc_entry *entry;
407 
408 	while (begin != end) {
409 		int middle = begin + (end - begin) / 2;
410 		entry = applesmc_get_entry_by_index(middle);
411 		if (IS_ERR(entry)) {
412 			*lo = 0;
413 			return PTR_ERR(entry);
414 		}
415 		if (strcmp(entry->key, key) < 0)
416 			begin = middle + 1;
417 		else
418 			end = middle;
419 	}
420 
421 	*lo = begin;
422 	return 0;
423 }
424 
applesmc_get_upper_bound(unsigned int * hi,const char * key)425 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
426 {
427 	int begin = 0, end = smcreg.key_count;
428 	const struct applesmc_entry *entry;
429 
430 	while (begin != end) {
431 		int middle = begin + (end - begin) / 2;
432 		entry = applesmc_get_entry_by_index(middle);
433 		if (IS_ERR(entry)) {
434 			*hi = smcreg.key_count;
435 			return PTR_ERR(entry);
436 		}
437 		if (strcmp(key, entry->key) < 0)
438 			end = middle;
439 		else
440 			begin = middle + 1;
441 	}
442 
443 	*hi = begin;
444 	return 0;
445 }
446 
applesmc_get_entry_by_key(const char * key)447 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
448 {
449 	int begin, end;
450 	int ret;
451 
452 	ret = applesmc_get_lower_bound(&begin, key);
453 	if (ret)
454 		return ERR_PTR(ret);
455 	ret = applesmc_get_upper_bound(&end, key);
456 	if (ret)
457 		return ERR_PTR(ret);
458 	if (end - begin != 1)
459 		return ERR_PTR(-EINVAL);
460 
461 	return applesmc_get_entry_by_index(begin);
462 }
463 
applesmc_read_key(const char * key,u8 * buffer,u8 len)464 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
465 {
466 	const struct applesmc_entry *entry;
467 
468 	entry = applesmc_get_entry_by_key(key);
469 	if (IS_ERR(entry))
470 		return PTR_ERR(entry);
471 
472 	return applesmc_read_entry(entry, buffer, len);
473 }
474 
applesmc_write_key(const char * key,const u8 * buffer,u8 len)475 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
476 {
477 	const struct applesmc_entry *entry;
478 
479 	entry = applesmc_get_entry_by_key(key);
480 	if (IS_ERR(entry))
481 		return PTR_ERR(entry);
482 
483 	return applesmc_write_entry(entry, buffer, len);
484 }
485 
applesmc_has_key(const char * key,bool * value)486 static int applesmc_has_key(const char *key, bool *value)
487 {
488 	const struct applesmc_entry *entry;
489 
490 	entry = applesmc_get_entry_by_key(key);
491 	if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
492 		return PTR_ERR(entry);
493 
494 	*value = !IS_ERR(entry);
495 	return 0;
496 }
497 
498 /*
499  * applesmc_read_s16 - Read 16-bit signed big endian register
500  */
applesmc_read_s16(const char * key,s16 * value)501 static int applesmc_read_s16(const char *key, s16 *value)
502 {
503 	u8 buffer[2];
504 	int ret;
505 
506 	ret = applesmc_read_key(key, buffer, 2);
507 	if (ret)
508 		return ret;
509 
510 	*value = ((s16)buffer[0] << 8) | buffer[1];
511 	return 0;
512 }
513 
514 /*
515  * applesmc_device_init - initialize the accelerometer.  Can sleep.
516  */
applesmc_device_init(void)517 static void applesmc_device_init(void)
518 {
519 	int total;
520 	u8 buffer[2];
521 
522 	if (!smcreg.has_accelerometer)
523 		return;
524 
525 	for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
526 		if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
527 				(buffer[0] != 0x00 || buffer[1] != 0x00))
528 			return;
529 		buffer[0] = 0xe0;
530 		buffer[1] = 0x00;
531 		applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
532 		msleep(INIT_WAIT_MSECS);
533 	}
534 
535 	pr_warn("failed to init the device\n");
536 }
537 
applesmc_init_index(struct applesmc_registers * s)538 static int applesmc_init_index(struct applesmc_registers *s)
539 {
540 	const struct applesmc_entry *entry;
541 	unsigned int i;
542 
543 	if (s->index)
544 		return 0;
545 
546 	s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
547 	if (!s->index)
548 		return -ENOMEM;
549 
550 	for (i = s->temp_begin; i < s->temp_end; i++) {
551 		entry = applesmc_get_entry_by_index(i);
552 		if (IS_ERR(entry))
553 			continue;
554 		if (strcmp(entry->type, TEMP_SENSOR_TYPE))
555 			continue;
556 		s->index[s->index_count++] = entry->key;
557 	}
558 
559 	return 0;
560 }
561 
562 /*
563  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
564  */
applesmc_init_smcreg_try(void)565 static int applesmc_init_smcreg_try(void)
566 {
567 	struct applesmc_registers *s = &smcreg;
568 	bool left_light_sensor = false, right_light_sensor = false;
569 	unsigned int count;
570 	u8 tmp[1];
571 	int ret;
572 
573 	if (s->init_complete)
574 		return 0;
575 
576 	ret = read_register_count(&count);
577 	if (ret)
578 		return ret;
579 
580 	if (s->cache && s->key_count != count) {
581 		pr_warn("key count changed from %d to %d\n",
582 			s->key_count, count);
583 		kfree(s->cache);
584 		s->cache = NULL;
585 	}
586 	s->key_count = count;
587 
588 	if (!s->cache)
589 		s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
590 	if (!s->cache)
591 		return -ENOMEM;
592 
593 	ret = applesmc_read_key(FANS_COUNT, tmp, 1);
594 	if (ret)
595 		return ret;
596 	s->fan_count = tmp[0];
597 	if (s->fan_count > 10)
598 		s->fan_count = 10;
599 
600 	ret = applesmc_get_lower_bound(&s->temp_begin, "T");
601 	if (ret)
602 		return ret;
603 	ret = applesmc_get_lower_bound(&s->temp_end, "U");
604 	if (ret)
605 		return ret;
606 	s->temp_count = s->temp_end - s->temp_begin;
607 
608 	ret = applesmc_init_index(s);
609 	if (ret)
610 		return ret;
611 
612 	ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
613 	if (ret)
614 		return ret;
615 	ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
616 	if (ret)
617 		return ret;
618 	ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
619 	if (ret)
620 		return ret;
621 	ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
622 	if (ret)
623 		return ret;
624 
625 	s->num_light_sensors = left_light_sensor + right_light_sensor;
626 	s->init_complete = true;
627 
628 	pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
629 	       s->key_count, s->fan_count, s->temp_count, s->index_count,
630 	       s->has_accelerometer,
631 	       s->num_light_sensors,
632 	       s->has_key_backlight);
633 
634 	return 0;
635 }
636 
applesmc_destroy_smcreg(void)637 static void applesmc_destroy_smcreg(void)
638 {
639 	kfree(smcreg.index);
640 	smcreg.index = NULL;
641 	kfree(smcreg.cache);
642 	smcreg.cache = NULL;
643 	smcreg.init_complete = false;
644 }
645 
646 /*
647  * applesmc_init_smcreg - Initialize register cache.
648  *
649  * Retries until initialization is successful, or the operation times out.
650  *
651  */
applesmc_init_smcreg(void)652 static int applesmc_init_smcreg(void)
653 {
654 	int ms, ret;
655 
656 	for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
657 		ret = applesmc_init_smcreg_try();
658 		if (!ret) {
659 			if (ms)
660 				pr_info("init_smcreg() took %d ms\n", ms);
661 			return 0;
662 		}
663 		msleep(INIT_WAIT_MSECS);
664 	}
665 
666 	applesmc_destroy_smcreg();
667 
668 	return ret;
669 }
670 
671 /* Device model stuff */
applesmc_probe(struct platform_device * dev)672 static int applesmc_probe(struct platform_device *dev)
673 {
674 	int ret;
675 
676 	ret = applesmc_init_smcreg();
677 	if (ret)
678 		return ret;
679 
680 	applesmc_device_init();
681 
682 	return 0;
683 }
684 
685 /* Synchronize device with memorized backlight state */
applesmc_pm_resume(struct device * dev)686 static int applesmc_pm_resume(struct device *dev)
687 {
688 	if (smcreg.has_key_backlight)
689 		applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
690 	return 0;
691 }
692 
693 /* Reinitialize device on resume from hibernation */
applesmc_pm_restore(struct device * dev)694 static int applesmc_pm_restore(struct device *dev)
695 {
696 	applesmc_device_init();
697 	return applesmc_pm_resume(dev);
698 }
699 
700 static const struct dev_pm_ops applesmc_pm_ops = {
701 	.resume = applesmc_pm_resume,
702 	.restore = applesmc_pm_restore,
703 };
704 
705 static struct platform_driver applesmc_driver = {
706 	.probe = applesmc_probe,
707 	.driver	= {
708 		.name = "applesmc",
709 		.pm = &applesmc_pm_ops,
710 	},
711 };
712 
713 /*
714  * applesmc_calibrate - Set our "resting" values.  Callers must
715  * hold applesmc_lock.
716  */
applesmc_calibrate(void)717 static void applesmc_calibrate(void)
718 {
719 	applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
720 	applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
721 	rest_x = -rest_x;
722 }
723 
applesmc_idev_poll(struct input_dev * idev)724 static void applesmc_idev_poll(struct input_dev *idev)
725 {
726 	s16 x, y;
727 
728 	if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
729 		return;
730 	if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
731 		return;
732 
733 	x = -x;
734 	input_report_abs(idev, ABS_X, x - rest_x);
735 	input_report_abs(idev, ABS_Y, y - rest_y);
736 	input_sync(idev);
737 }
738 
739 /* Sysfs Files */
740 
applesmc_name_show(struct device * dev,struct device_attribute * attr,char * buf)741 static ssize_t applesmc_name_show(struct device *dev,
742 				   struct device_attribute *attr, char *buf)
743 {
744 	return sysfs_emit(buf, "applesmc\n");
745 }
746 
applesmc_position_show(struct device * dev,struct device_attribute * attr,char * buf)747 static ssize_t applesmc_position_show(struct device *dev,
748 				   struct device_attribute *attr, char *buf)
749 {
750 	int ret;
751 	s16 x, y, z;
752 
753 	ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
754 	if (ret)
755 		goto out;
756 	ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
757 	if (ret)
758 		goto out;
759 	ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
760 	if (ret)
761 		goto out;
762 
763 out:
764 	if (ret)
765 		return ret;
766 
767 	return sysfs_emit(buf, "(%d,%d,%d)\n", x, y, z);
768 }
769 
applesmc_light_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)770 static ssize_t applesmc_light_show(struct device *dev,
771 				struct device_attribute *attr, char *sysfsbuf)
772 {
773 	const struct applesmc_entry *entry;
774 	static int data_length;
775 	int ret;
776 	u8 left = 0, right = 0;
777 	u8 buffer[10];
778 
779 	if (!data_length) {
780 		entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
781 		if (IS_ERR(entry))
782 			return PTR_ERR(entry);
783 		if (entry->len > 10)
784 			return -ENXIO;
785 		data_length = entry->len;
786 		pr_info("light sensor data length set to %d\n", data_length);
787 	}
788 
789 	ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
790 	if (ret)
791 		goto out;
792 	/* newer macbooks report a single 10-bit bigendian value */
793 	if (data_length == 10) {
794 		left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
795 		goto out;
796 	}
797 	left = buffer[2];
798 
799 	ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
800 	if (ret)
801 		goto out;
802 	right = buffer[2];
803 
804 out:
805 	if (ret)
806 		return ret;
807 
808 	return sysfs_emit(sysfsbuf, "(%d,%d)\n", left, right);
809 }
810 
811 /* Displays sensor key as label */
applesmc_show_sensor_label(struct device * dev,struct device_attribute * devattr,char * sysfsbuf)812 static ssize_t applesmc_show_sensor_label(struct device *dev,
813 			struct device_attribute *devattr, char *sysfsbuf)
814 {
815 	const char *key = smcreg.index[to_index(devattr)];
816 
817 	return sysfs_emit(sysfsbuf, "%s\n", key);
818 }
819 
820 /* Displays degree Celsius * 1000 */
applesmc_show_temperature(struct device * dev,struct device_attribute * devattr,char * sysfsbuf)821 static ssize_t applesmc_show_temperature(struct device *dev,
822 			struct device_attribute *devattr, char *sysfsbuf)
823 {
824 	const char *key = smcreg.index[to_index(devattr)];
825 	int ret;
826 	s16 value;
827 	int temp;
828 
829 	ret = applesmc_read_s16(key, &value);
830 	if (ret)
831 		return ret;
832 
833 	temp = 250 * (value >> 6);
834 
835 	return sysfs_emit(sysfsbuf, "%d\n", temp);
836 }
837 
applesmc_show_fan_speed(struct device * dev,struct device_attribute * attr,char * sysfsbuf)838 static ssize_t applesmc_show_fan_speed(struct device *dev,
839 				struct device_attribute *attr, char *sysfsbuf)
840 {
841 	int ret;
842 	unsigned int speed = 0;
843 	char newkey[5];
844 	u8 buffer[2];
845 
846 	scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
847 		  to_index(attr));
848 
849 	ret = applesmc_read_key(newkey, buffer, 2);
850 	if (ret)
851 		return ret;
852 
853 	speed = ((buffer[0] << 8 | buffer[1]) >> 2);
854 	return sysfs_emit(sysfsbuf, "%u\n", speed);
855 }
856 
applesmc_store_fan_speed(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)857 static ssize_t applesmc_store_fan_speed(struct device *dev,
858 					struct device_attribute *attr,
859 					const char *sysfsbuf, size_t count)
860 {
861 	int ret;
862 	unsigned long speed;
863 	char newkey[5];
864 	u8 buffer[2];
865 
866 	if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
867 		return -EINVAL;		/* Bigger than a 14-bit value */
868 
869 	scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
870 		  to_index(attr));
871 
872 	buffer[0] = (speed >> 6) & 0xff;
873 	buffer[1] = (speed << 2) & 0xff;
874 	ret = applesmc_write_key(newkey, buffer, 2);
875 
876 	if (ret)
877 		return ret;
878 	else
879 		return count;
880 }
881 
applesmc_show_fan_manual(struct device * dev,struct device_attribute * attr,char * sysfsbuf)882 static ssize_t applesmc_show_fan_manual(struct device *dev,
883 			struct device_attribute *attr, char *sysfsbuf)
884 {
885 	int ret;
886 	u16 manual = 0;
887 	u8 buffer[2];
888 
889 	ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
890 	if (ret)
891 		return ret;
892 
893 	manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
894 	return sysfs_emit(sysfsbuf, "%d\n", manual);
895 }
896 
applesmc_store_fan_manual(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)897 static ssize_t applesmc_store_fan_manual(struct device *dev,
898 					 struct device_attribute *attr,
899 					 const char *sysfsbuf, size_t count)
900 {
901 	int ret;
902 	u8 buffer[2];
903 	unsigned long input;
904 	u16 val;
905 
906 	if (kstrtoul(sysfsbuf, 10, &input) < 0)
907 		return -EINVAL;
908 
909 	ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
910 	if (ret)
911 		goto out;
912 
913 	val = (buffer[0] << 8 | buffer[1]);
914 
915 	if (input)
916 		val = val | (0x01 << to_index(attr));
917 	else
918 		val = val & ~(0x01 << to_index(attr));
919 
920 	buffer[0] = (val >> 8) & 0xFF;
921 	buffer[1] = val & 0xFF;
922 
923 	ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
924 
925 out:
926 	if (ret)
927 		return ret;
928 	else
929 		return count;
930 }
931 
applesmc_show_fan_position(struct device * dev,struct device_attribute * attr,char * sysfsbuf)932 static ssize_t applesmc_show_fan_position(struct device *dev,
933 				struct device_attribute *attr, char *sysfsbuf)
934 {
935 	int ret;
936 	char newkey[5];
937 	u8 buffer[17];
938 
939 	scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, to_index(attr));
940 
941 	ret = applesmc_read_key(newkey, buffer, 16);
942 	buffer[16] = 0;
943 
944 	if (ret)
945 		return ret;
946 
947 	return sysfs_emit(sysfsbuf, "%s\n", buffer + 4);
948 }
949 
applesmc_calibrate_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)950 static ssize_t applesmc_calibrate_show(struct device *dev,
951 				struct device_attribute *attr, char *sysfsbuf)
952 {
953 	return sysfs_emit(sysfsbuf, "(%d,%d)\n", rest_x, rest_y);
954 }
955 
applesmc_calibrate_store(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)956 static ssize_t applesmc_calibrate_store(struct device *dev,
957 	struct device_attribute *attr, const char *sysfsbuf, size_t count)
958 {
959 	applesmc_calibrate();
960 
961 	return count;
962 }
963 
applesmc_backlight_set(struct work_struct * work)964 static void applesmc_backlight_set(struct work_struct *work)
965 {
966 	applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
967 }
968 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
969 
applesmc_brightness_set(struct led_classdev * led_cdev,enum led_brightness value)970 static void applesmc_brightness_set(struct led_classdev *led_cdev,
971 						enum led_brightness value)
972 {
973 	int ret;
974 
975 	backlight_state[0] = value;
976 	ret = queue_work(applesmc_led_wq, &backlight_work);
977 
978 	if (debug && (!ret))
979 		dev_dbg(led_cdev->dev, "work was already on the queue.\n");
980 }
981 
applesmc_key_count_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)982 static ssize_t applesmc_key_count_show(struct device *dev,
983 				struct device_attribute *attr, char *sysfsbuf)
984 {
985 	int ret;
986 	u8 buffer[4];
987 	u32 count;
988 
989 	ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
990 	if (ret)
991 		return ret;
992 
993 	count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
994 						((u32)buffer[2]<<8) + buffer[3];
995 	return sysfs_emit(sysfsbuf, "%d\n", count);
996 }
997 
applesmc_key_at_index_read_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)998 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
999 				struct device_attribute *attr, char *sysfsbuf)
1000 {
1001 	const struct applesmc_entry *entry;
1002 	int ret;
1003 
1004 	entry = applesmc_get_entry_by_index(key_at_index);
1005 	if (IS_ERR(entry))
1006 		return PTR_ERR(entry);
1007 	ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
1008 	if (ret)
1009 		return ret;
1010 
1011 	return entry->len;
1012 }
1013 
applesmc_key_at_index_data_length_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)1014 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
1015 				struct device_attribute *attr, char *sysfsbuf)
1016 {
1017 	const struct applesmc_entry *entry;
1018 
1019 	entry = applesmc_get_entry_by_index(key_at_index);
1020 	if (IS_ERR(entry))
1021 		return PTR_ERR(entry);
1022 
1023 	return sysfs_emit(sysfsbuf, "%d\n", entry->len);
1024 }
1025 
applesmc_key_at_index_type_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)1026 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
1027 				struct device_attribute *attr, char *sysfsbuf)
1028 {
1029 	const struct applesmc_entry *entry;
1030 
1031 	entry = applesmc_get_entry_by_index(key_at_index);
1032 	if (IS_ERR(entry))
1033 		return PTR_ERR(entry);
1034 
1035 	return sysfs_emit(sysfsbuf, "%s\n", entry->type);
1036 }
1037 
applesmc_key_at_index_name_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)1038 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
1039 				struct device_attribute *attr, char *sysfsbuf)
1040 {
1041 	const struct applesmc_entry *entry;
1042 
1043 	entry = applesmc_get_entry_by_index(key_at_index);
1044 	if (IS_ERR(entry))
1045 		return PTR_ERR(entry);
1046 
1047 	return sysfs_emit(sysfsbuf, "%s\n", entry->key);
1048 }
1049 
applesmc_key_at_index_show(struct device * dev,struct device_attribute * attr,char * sysfsbuf)1050 static ssize_t applesmc_key_at_index_show(struct device *dev,
1051 				struct device_attribute *attr, char *sysfsbuf)
1052 {
1053 	return sysfs_emit(sysfsbuf, "%d\n", key_at_index);
1054 }
1055 
applesmc_key_at_index_store(struct device * dev,struct device_attribute * attr,const char * sysfsbuf,size_t count)1056 static ssize_t applesmc_key_at_index_store(struct device *dev,
1057 	struct device_attribute *attr, const char *sysfsbuf, size_t count)
1058 {
1059 	unsigned long newkey;
1060 
1061 	if (kstrtoul(sysfsbuf, 10, &newkey) < 0
1062 	    || newkey >= smcreg.key_count)
1063 		return -EINVAL;
1064 
1065 	key_at_index = newkey;
1066 	return count;
1067 }
1068 
1069 static struct led_classdev applesmc_backlight = {
1070 	.name			= "smc::kbd_backlight",
1071 	.default_trigger	= "nand-disk",
1072 	.brightness_set		= applesmc_brightness_set,
1073 };
1074 
1075 static struct applesmc_node_group info_group[] = {
1076 	{ "name", applesmc_name_show },
1077 	{ "key_count", applesmc_key_count_show },
1078 	{ "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1079 	{ "key_at_index_name", applesmc_key_at_index_name_show },
1080 	{ "key_at_index_type", applesmc_key_at_index_type_show },
1081 	{ "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1082 	{ "key_at_index_data", applesmc_key_at_index_read_show },
1083 	{ }
1084 };
1085 
1086 static struct applesmc_node_group accelerometer_group[] = {
1087 	{ "position", applesmc_position_show },
1088 	{ "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1089 	{ }
1090 };
1091 
1092 static struct applesmc_node_group light_sensor_group[] = {
1093 	{ "light", applesmc_light_show },
1094 	{ }
1095 };
1096 
1097 static struct applesmc_node_group fan_group[] = {
1098 	{ "fan%d_label", applesmc_show_fan_position },
1099 	{ "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1100 	{ "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1101 	{ "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1102 	{ "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1103 	{ "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1104 	{ "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1105 	{ }
1106 };
1107 
1108 static struct applesmc_node_group temp_group[] = {
1109 	{ "temp%d_label", applesmc_show_sensor_label },
1110 	{ "temp%d_input", applesmc_show_temperature },
1111 	{ }
1112 };
1113 
1114 /* Module stuff */
1115 
1116 /*
1117  * applesmc_destroy_nodes - remove files and free associated memory
1118  */
applesmc_destroy_nodes(struct applesmc_node_group * groups)1119 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1120 {
1121 	struct applesmc_node_group *grp;
1122 	struct applesmc_dev_attr *node;
1123 
1124 	for (grp = groups; grp->nodes; grp++) {
1125 		for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1126 			sysfs_remove_file(&pdev->dev.kobj,
1127 					  &node->sda.dev_attr.attr);
1128 		kfree(grp->nodes);
1129 		grp->nodes = NULL;
1130 	}
1131 }
1132 
1133 /*
1134  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1135  */
applesmc_create_nodes(struct applesmc_node_group * groups,int num)1136 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1137 {
1138 	struct applesmc_node_group *grp;
1139 	struct applesmc_dev_attr *node;
1140 	struct attribute *attr;
1141 	int ret, i;
1142 
1143 	for (grp = groups; grp->format; grp++) {
1144 		grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1145 		if (!grp->nodes) {
1146 			ret = -ENOMEM;
1147 			goto out;
1148 		}
1149 		for (i = 0; i < num; i++) {
1150 			node = &grp->nodes[i];
1151 			scnprintf(node->name, sizeof(node->name), grp->format,
1152 				  i + 1);
1153 			node->sda.index = (grp->option << 16) | (i & 0xffff);
1154 			node->sda.dev_attr.show = grp->show;
1155 			node->sda.dev_attr.store = grp->store;
1156 			attr = &node->sda.dev_attr.attr;
1157 			sysfs_attr_init(attr);
1158 			attr->name = node->name;
1159 			attr->mode = 0444 | (grp->store ? 0200 : 0);
1160 			ret = sysfs_create_file(&pdev->dev.kobj, attr);
1161 			if (ret) {
1162 				attr->name = NULL;
1163 				goto out;
1164 			}
1165 		}
1166 	}
1167 
1168 	return 0;
1169 out:
1170 	applesmc_destroy_nodes(groups);
1171 	return ret;
1172 }
1173 
1174 /* Create accelerometer resources */
applesmc_create_accelerometer(void)1175 static int applesmc_create_accelerometer(void)
1176 {
1177 	int ret;
1178 
1179 	if (!smcreg.has_accelerometer)
1180 		return 0;
1181 
1182 	ret = applesmc_create_nodes(accelerometer_group, 1);
1183 	if (ret)
1184 		goto out;
1185 
1186 	applesmc_idev = input_allocate_device();
1187 	if (!applesmc_idev) {
1188 		ret = -ENOMEM;
1189 		goto out_sysfs;
1190 	}
1191 
1192 	/* initial calibrate for the input device */
1193 	applesmc_calibrate();
1194 
1195 	/* initialize the input device */
1196 	applesmc_idev->name = "applesmc";
1197 	applesmc_idev->id.bustype = BUS_HOST;
1198 	applesmc_idev->dev.parent = &pdev->dev;
1199 	input_set_abs_params(applesmc_idev, ABS_X,
1200 			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1201 	input_set_abs_params(applesmc_idev, ABS_Y,
1202 			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1203 
1204 	ret = input_setup_polling(applesmc_idev, applesmc_idev_poll);
1205 	if (ret)
1206 		goto out_idev;
1207 
1208 	input_set_poll_interval(applesmc_idev, APPLESMC_POLL_INTERVAL);
1209 
1210 	ret = input_register_device(applesmc_idev);
1211 	if (ret)
1212 		goto out_idev;
1213 
1214 	return 0;
1215 
1216 out_idev:
1217 	input_free_device(applesmc_idev);
1218 
1219 out_sysfs:
1220 	applesmc_destroy_nodes(accelerometer_group);
1221 
1222 out:
1223 	pr_warn("driver init failed (ret=%d)!\n", ret);
1224 	return ret;
1225 }
1226 
1227 /* Release all resources used by the accelerometer */
applesmc_release_accelerometer(void)1228 static void applesmc_release_accelerometer(void)
1229 {
1230 	if (!smcreg.has_accelerometer)
1231 		return;
1232 	input_unregister_device(applesmc_idev);
1233 	applesmc_destroy_nodes(accelerometer_group);
1234 }
1235 
applesmc_create_light_sensor(void)1236 static int applesmc_create_light_sensor(void)
1237 {
1238 	if (!smcreg.num_light_sensors)
1239 		return 0;
1240 	return applesmc_create_nodes(light_sensor_group, 1);
1241 }
1242 
applesmc_release_light_sensor(void)1243 static void applesmc_release_light_sensor(void)
1244 {
1245 	if (!smcreg.num_light_sensors)
1246 		return;
1247 	applesmc_destroy_nodes(light_sensor_group);
1248 }
1249 
applesmc_create_key_backlight(void)1250 static int applesmc_create_key_backlight(void)
1251 {
1252 	if (!smcreg.has_key_backlight)
1253 		return 0;
1254 	applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1255 	if (!applesmc_led_wq)
1256 		return -ENOMEM;
1257 	return led_classdev_register(&pdev->dev, &applesmc_backlight);
1258 }
1259 
applesmc_release_key_backlight(void)1260 static void applesmc_release_key_backlight(void)
1261 {
1262 	if (!smcreg.has_key_backlight)
1263 		return;
1264 	led_classdev_unregister(&applesmc_backlight);
1265 	destroy_workqueue(applesmc_led_wq);
1266 }
1267 
applesmc_dmi_match(const struct dmi_system_id * id)1268 static int applesmc_dmi_match(const struct dmi_system_id *id)
1269 {
1270 	return 1;
1271 }
1272 
1273 /*
1274  * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1275  * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1276  */
1277 static const struct dmi_system_id applesmc_whitelist[] __initconst = {
1278 	{ applesmc_dmi_match, "Apple MacBook Air", {
1279 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1280 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1281 	},
1282 	{ applesmc_dmi_match, "Apple MacBook Pro", {
1283 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1284 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1285 	},
1286 	{ applesmc_dmi_match, "Apple MacBook", {
1287 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1288 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1289 	},
1290 	{ applesmc_dmi_match, "Apple Macmini", {
1291 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1292 	  DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1293 	},
1294 	{ applesmc_dmi_match, "Apple MacPro", {
1295 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1296 	  DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1297 	},
1298 	{ applesmc_dmi_match, "Apple iMac", {
1299 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1300 	  DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1301 	},
1302 	{ applesmc_dmi_match, "Apple Xserve", {
1303 	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1304 	  DMI_MATCH(DMI_PRODUCT_NAME, "Xserve") },
1305 	},
1306 	{ .ident = NULL }
1307 };
1308 
applesmc_init(void)1309 static int __init applesmc_init(void)
1310 {
1311 	int ret;
1312 
1313 	if (!dmi_check_system(applesmc_whitelist)) {
1314 		pr_warn("supported laptop not found!\n");
1315 		ret = -ENODEV;
1316 		goto out;
1317 	}
1318 
1319 	if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1320 								"applesmc")) {
1321 		ret = -ENXIO;
1322 		goto out;
1323 	}
1324 
1325 	ret = platform_driver_register(&applesmc_driver);
1326 	if (ret)
1327 		goto out_region;
1328 
1329 	pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1330 					       NULL, 0);
1331 	if (IS_ERR(pdev)) {
1332 		ret = PTR_ERR(pdev);
1333 		goto out_driver;
1334 	}
1335 
1336 	/* create register cache */
1337 	ret = applesmc_init_smcreg();
1338 	if (ret)
1339 		goto out_device;
1340 
1341 	ret = applesmc_create_nodes(info_group, 1);
1342 	if (ret)
1343 		goto out_smcreg;
1344 
1345 	ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1346 	if (ret)
1347 		goto out_info;
1348 
1349 	ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1350 	if (ret)
1351 		goto out_fans;
1352 
1353 	ret = applesmc_create_accelerometer();
1354 	if (ret)
1355 		goto out_temperature;
1356 
1357 	ret = applesmc_create_light_sensor();
1358 	if (ret)
1359 		goto out_accelerometer;
1360 
1361 	ret = applesmc_create_key_backlight();
1362 	if (ret)
1363 		goto out_light_sysfs;
1364 
1365 	hwmon_dev = hwmon_device_register(&pdev->dev);
1366 	if (IS_ERR(hwmon_dev)) {
1367 		ret = PTR_ERR(hwmon_dev);
1368 		goto out_light_ledclass;
1369 	}
1370 
1371 	return 0;
1372 
1373 out_light_ledclass:
1374 	applesmc_release_key_backlight();
1375 out_light_sysfs:
1376 	applesmc_release_light_sensor();
1377 out_accelerometer:
1378 	applesmc_release_accelerometer();
1379 out_temperature:
1380 	applesmc_destroy_nodes(temp_group);
1381 out_fans:
1382 	applesmc_destroy_nodes(fan_group);
1383 out_info:
1384 	applesmc_destroy_nodes(info_group);
1385 out_smcreg:
1386 	applesmc_destroy_smcreg();
1387 out_device:
1388 	platform_device_unregister(pdev);
1389 out_driver:
1390 	platform_driver_unregister(&applesmc_driver);
1391 out_region:
1392 	release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1393 out:
1394 	pr_warn("driver init failed (ret=%d)!\n", ret);
1395 	return ret;
1396 }
1397 
applesmc_exit(void)1398 static void __exit applesmc_exit(void)
1399 {
1400 	hwmon_device_unregister(hwmon_dev);
1401 	applesmc_release_key_backlight();
1402 	applesmc_release_light_sensor();
1403 	applesmc_release_accelerometer();
1404 	applesmc_destroy_nodes(temp_group);
1405 	applesmc_destroy_nodes(fan_group);
1406 	applesmc_destroy_nodes(info_group);
1407 	applesmc_destroy_smcreg();
1408 	platform_device_unregister(pdev);
1409 	platform_driver_unregister(&applesmc_driver);
1410 	release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1411 }
1412 
1413 module_init(applesmc_init);
1414 module_exit(applesmc_exit);
1415 
1416 MODULE_AUTHOR("Nicolas Boichat");
1417 MODULE_DESCRIPTION("Apple SMC");
1418 MODULE_LICENSE("GPL v2");
1419 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);
1420