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