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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 */
87static 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 */
106struct 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 */
112struct 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 */
121struct 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 */
130static 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
148static const int debug;
149static struct platform_device *pdev;
150static s16 rest_x;
151static s16 rest_y;
152static u8 backlight_state[2];
153
154static struct device *hwmon_dev;
155static 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 */
161static unsigned int key_at_index;
162
163static 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 */
169static 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 */
189static 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
216static int send_command(u8 cmd)
217{
218 return send_byte(cmd, APPLESMC_CMD_PORT);
219}
220
221static 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
231static 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
269static 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
293static 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
313static 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
327static 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
340static 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
368out:
369 mutex_unlock(&smcreg.mutex);
370 if (ret)
371 return ERR_PTR(ret);
372 return cache;
373}
374
375static 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
397static 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
419static 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
436static 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
447static 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
458static 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 */
473static 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 */
489static 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
510static 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 */
537static int applesmc_init_smcreg_try(void)
538{
539 struct applesmc_registers *s = &smcreg;
540 bool left_light_sensor = 0, right_light_sensor = 0;
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 if (s->fan_count > 10)
570 s->fan_count = 10;
571
572 ret = applesmc_get_lower_bound(&s->temp_begin, "T");
573 if (ret)
574 return ret;
575 ret = applesmc_get_lower_bound(&s->temp_end, "U");
576 if (ret)
577 return ret;
578 s->temp_count = s->temp_end - s->temp_begin;
579
580 ret = applesmc_init_index(s);
581 if (ret)
582 return ret;
583
584 ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
585 if (ret)
586 return ret;
587 ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
588 if (ret)
589 return ret;
590 ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
591 if (ret)
592 return ret;
593 ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
594 if (ret)
595 return ret;
596
597 s->num_light_sensors = left_light_sensor + right_light_sensor;
598 s->init_complete = true;
599
600 pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
601 s->key_count, s->fan_count, s->temp_count, s->index_count,
602 s->has_accelerometer,
603 s->num_light_sensors,
604 s->has_key_backlight);
605
606 return 0;
607}
608
609static void applesmc_destroy_smcreg(void)
610{
611 kfree(smcreg.index);
612 smcreg.index = NULL;
613 kfree(smcreg.cache);
614 smcreg.cache = NULL;
615 smcreg.init_complete = false;
616}
617
618/*
619 * applesmc_init_smcreg - Initialize register cache.
620 *
621 * Retries until initialization is successful, or the operation times out.
622 *
623 */
624static int applesmc_init_smcreg(void)
625{
626 int ms, ret;
627
628 for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
629 ret = applesmc_init_smcreg_try();
630 if (!ret) {
631 if (ms)
632 pr_info("init_smcreg() took %d ms\n", ms);
633 return 0;
634 }
635 msleep(INIT_WAIT_MSECS);
636 }
637
638 applesmc_destroy_smcreg();
639
640 return ret;
641}
642
643/* Device model stuff */
644static int applesmc_probe(struct platform_device *dev)
645{
646 int ret;
647
648 ret = applesmc_init_smcreg();
649 if (ret)
650 return ret;
651
652 applesmc_device_init();
653
654 return 0;
655}
656
657/* Synchronize device with memorized backlight state */
658static int applesmc_pm_resume(struct device *dev)
659{
660 if (smcreg.has_key_backlight)
661 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
662 return 0;
663}
664
665/* Reinitialize device on resume from hibernation */
666static int applesmc_pm_restore(struct device *dev)
667{
668 applesmc_device_init();
669 return applesmc_pm_resume(dev);
670}
671
672static const struct dev_pm_ops applesmc_pm_ops = {
673 .resume = applesmc_pm_resume,
674 .restore = applesmc_pm_restore,
675};
676
677static struct platform_driver applesmc_driver = {
678 .probe = applesmc_probe,
679 .driver = {
680 .name = "applesmc",
681 .pm = &applesmc_pm_ops,
682 },
683};
684
685/*
686 * applesmc_calibrate - Set our "resting" values. Callers must
687 * hold applesmc_lock.
688 */
689static void applesmc_calibrate(void)
690{
691 applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
692 applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
693 rest_x = -rest_x;
694}
695
696static void applesmc_idev_poll(struct input_polled_dev *dev)
697{
698 struct input_dev *idev = dev->input;
699 s16 x, y;
700
701 if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
702 return;
703 if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
704 return;
705
706 x = -x;
707 input_report_abs(idev, ABS_X, x - rest_x);
708 input_report_abs(idev, ABS_Y, y - rest_y);
709 input_sync(idev);
710}
711
712/* Sysfs Files */
713
714static ssize_t applesmc_name_show(struct device *dev,
715 struct device_attribute *attr, char *buf)
716{
717 return snprintf(buf, PAGE_SIZE, "applesmc\n");
718}
719
720static ssize_t applesmc_position_show(struct device *dev,
721 struct device_attribute *attr, char *buf)
722{
723 int ret;
724 s16 x, y, z;
725
726 ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
727 if (ret)
728 goto out;
729 ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
730 if (ret)
731 goto out;
732 ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
733 if (ret)
734 goto out;
735
736out:
737 if (ret)
738 return ret;
739 else
740 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
741}
742
743static ssize_t applesmc_light_show(struct device *dev,
744 struct device_attribute *attr, char *sysfsbuf)
745{
746 const struct applesmc_entry *entry;
747 static int data_length;
748 int ret;
749 u8 left = 0, right = 0;
750 u8 buffer[10];
751
752 if (!data_length) {
753 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
754 if (IS_ERR(entry))
755 return PTR_ERR(entry);
756 if (entry->len > 10)
757 return -ENXIO;
758 data_length = entry->len;
759 pr_info("light sensor data length set to %d\n", data_length);
760 }
761
762 ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
763 /* newer macbooks report a single 10-bit bigendian value */
764 if (data_length == 10) {
765 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
766 goto out;
767 }
768 left = buffer[2];
769 if (ret)
770 goto out;
771 ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
772 right = buffer[2];
773
774out:
775 if (ret)
776 return ret;
777 else
778 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
779}
780
781/* Displays sensor key as label */
782static ssize_t applesmc_show_sensor_label(struct device *dev,
783 struct device_attribute *devattr, char *sysfsbuf)
784{
785 const char *key = smcreg.index[to_index(devattr)];
786
787 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
788}
789
790/* Displays degree Celsius * 1000 */
791static ssize_t applesmc_show_temperature(struct device *dev,
792 struct device_attribute *devattr, char *sysfsbuf)
793{
794 const char *key = smcreg.index[to_index(devattr)];
795 int ret;
796 s16 value;
797 int temp;
798
799 ret = applesmc_read_s16(key, &value);
800 if (ret)
801 return ret;
802
803 temp = 250 * (value >> 6);
804
805 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
806}
807
808static ssize_t applesmc_show_fan_speed(struct device *dev,
809 struct device_attribute *attr, char *sysfsbuf)
810{
811 int ret;
812 unsigned int speed = 0;
813 char newkey[5];
814 u8 buffer[2];
815
816 scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
817 to_index(attr));
818
819 ret = applesmc_read_key(newkey, buffer, 2);
820 speed = ((buffer[0] << 8 | buffer[1]) >> 2);
821
822 if (ret)
823 return ret;
824 else
825 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
826}
827
828static ssize_t applesmc_store_fan_speed(struct device *dev,
829 struct device_attribute *attr,
830 const char *sysfsbuf, size_t count)
831{
832 int ret;
833 unsigned long speed;
834 char newkey[5];
835 u8 buffer[2];
836
837 if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
838 return -EINVAL; /* Bigger than a 14-bit value */
839
840 scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
841 to_index(attr));
842
843 buffer[0] = (speed >> 6) & 0xff;
844 buffer[1] = (speed << 2) & 0xff;
845 ret = applesmc_write_key(newkey, buffer, 2);
846
847 if (ret)
848 return ret;
849 else
850 return count;
851}
852
853static ssize_t applesmc_show_fan_manual(struct device *dev,
854 struct device_attribute *attr, char *sysfsbuf)
855{
856 int ret;
857 u16 manual = 0;
858 u8 buffer[2];
859
860 ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
861 manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
862
863 if (ret)
864 return ret;
865 else
866 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
867}
868
869static ssize_t applesmc_store_fan_manual(struct device *dev,
870 struct device_attribute *attr,
871 const char *sysfsbuf, size_t count)
872{
873 int ret;
874 u8 buffer[2];
875 unsigned long input;
876 u16 val;
877
878 if (kstrtoul(sysfsbuf, 10, &input) < 0)
879 return -EINVAL;
880
881 ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
882 val = (buffer[0] << 8 | buffer[1]);
883 if (ret)
884 goto out;
885
886 if (input)
887 val = val | (0x01 << to_index(attr));
888 else
889 val = val & ~(0x01 << to_index(attr));
890
891 buffer[0] = (val >> 8) & 0xFF;
892 buffer[1] = val & 0xFF;
893
894 ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
895
896out:
897 if (ret)
898 return ret;
899 else
900 return count;
901}
902
903static ssize_t applesmc_show_fan_position(struct device *dev,
904 struct device_attribute *attr, char *sysfsbuf)
905{
906 int ret;
907 char newkey[5];
908 u8 buffer[17];
909
910 scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, to_index(attr));
911
912 ret = applesmc_read_key(newkey, buffer, 16);
913 buffer[16] = 0;
914
915 if (ret)
916 return ret;
917 else
918 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
919}
920
921static ssize_t applesmc_calibrate_show(struct device *dev,
922 struct device_attribute *attr, char *sysfsbuf)
923{
924 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
925}
926
927static ssize_t applesmc_calibrate_store(struct device *dev,
928 struct device_attribute *attr, const char *sysfsbuf, size_t count)
929{
930 applesmc_calibrate();
931
932 return count;
933}
934
935static void applesmc_backlight_set(struct work_struct *work)
936{
937 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
938}
939static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
940
941static void applesmc_brightness_set(struct led_classdev *led_cdev,
942 enum led_brightness value)
943{
944 int ret;
945
946 backlight_state[0] = value;
947 ret = queue_work(applesmc_led_wq, &backlight_work);
948
949 if (debug && (!ret))
950 dev_dbg(led_cdev->dev, "work was already on the queue.\n");
951}
952
953static ssize_t applesmc_key_count_show(struct device *dev,
954 struct device_attribute *attr, char *sysfsbuf)
955{
956 int ret;
957 u8 buffer[4];
958 u32 count;
959
960 ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
961 count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
962 ((u32)buffer[2]<<8) + buffer[3];
963
964 if (ret)
965 return ret;
966 else
967 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
968}
969
970static ssize_t applesmc_key_at_index_read_show(struct device *dev,
971 struct device_attribute *attr, char *sysfsbuf)
972{
973 const struct applesmc_entry *entry;
974 int ret;
975
976 entry = applesmc_get_entry_by_index(key_at_index);
977 if (IS_ERR(entry))
978 return PTR_ERR(entry);
979 ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
980 if (ret)
981 return ret;
982
983 return entry->len;
984}
985
986static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
987 struct device_attribute *attr, char *sysfsbuf)
988{
989 const struct applesmc_entry *entry;
990
991 entry = applesmc_get_entry_by_index(key_at_index);
992 if (IS_ERR(entry))
993 return PTR_ERR(entry);
994
995 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
996}
997
998static ssize_t applesmc_key_at_index_type_show(struct device *dev,
999 struct device_attribute *attr, char *sysfsbuf)
1000{
1001 const struct applesmc_entry *entry;
1002
1003 entry = applesmc_get_entry_by_index(key_at_index);
1004 if (IS_ERR(entry))
1005 return PTR_ERR(entry);
1006
1007 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
1008}
1009
1010static ssize_t applesmc_key_at_index_name_show(struct device *dev,
1011 struct device_attribute *attr, char *sysfsbuf)
1012{
1013 const struct applesmc_entry *entry;
1014
1015 entry = applesmc_get_entry_by_index(key_at_index);
1016 if (IS_ERR(entry))
1017 return PTR_ERR(entry);
1018
1019 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
1020}
1021
1022static ssize_t applesmc_key_at_index_show(struct device *dev,
1023 struct device_attribute *attr, char *sysfsbuf)
1024{
1025 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
1026}
1027
1028static ssize_t applesmc_key_at_index_store(struct device *dev,
1029 struct device_attribute *attr, const char *sysfsbuf, size_t count)
1030{
1031 unsigned long newkey;
1032
1033 if (kstrtoul(sysfsbuf, 10, &newkey) < 0
1034 || newkey >= smcreg.key_count)
1035 return -EINVAL;
1036
1037 key_at_index = newkey;
1038 return count;
1039}
1040
1041static struct led_classdev applesmc_backlight = {
1042 .name = "smc::kbd_backlight",
1043 .default_trigger = "nand-disk",
1044 .brightness_set = applesmc_brightness_set,
1045};
1046
1047static struct applesmc_node_group info_group[] = {
1048 { "name", applesmc_name_show },
1049 { "key_count", applesmc_key_count_show },
1050 { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1051 { "key_at_index_name", applesmc_key_at_index_name_show },
1052 { "key_at_index_type", applesmc_key_at_index_type_show },
1053 { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1054 { "key_at_index_data", applesmc_key_at_index_read_show },
1055 { }
1056};
1057
1058static struct applesmc_node_group accelerometer_group[] = {
1059 { "position", applesmc_position_show },
1060 { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1061 { }
1062};
1063
1064static struct applesmc_node_group light_sensor_group[] = {
1065 { "light", applesmc_light_show },
1066 { }
1067};
1068
1069static struct applesmc_node_group fan_group[] = {
1070 { "fan%d_label", applesmc_show_fan_position },
1071 { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1072 { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1073 { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1074 { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1075 { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1076 { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1077 { }
1078};
1079
1080static struct applesmc_node_group temp_group[] = {
1081 { "temp%d_label", applesmc_show_sensor_label },
1082 { "temp%d_input", applesmc_show_temperature },
1083 { }
1084};
1085
1086/* Module stuff */
1087
1088/*
1089 * applesmc_destroy_nodes - remove files and free associated memory
1090 */
1091static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1092{
1093 struct applesmc_node_group *grp;
1094 struct applesmc_dev_attr *node;
1095
1096 for (grp = groups; grp->nodes; grp++) {
1097 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1098 sysfs_remove_file(&pdev->dev.kobj,
1099 &node->sda.dev_attr.attr);
1100 kfree(grp->nodes);
1101 grp->nodes = NULL;
1102 }
1103}
1104
1105/*
1106 * applesmc_create_nodes - create a two-dimensional group of sysfs files
1107 */
1108static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1109{
1110 struct applesmc_node_group *grp;
1111 struct applesmc_dev_attr *node;
1112 struct attribute *attr;
1113 int ret, i;
1114
1115 for (grp = groups; grp->format; grp++) {
1116 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1117 if (!grp->nodes) {
1118 ret = -ENOMEM;
1119 goto out;
1120 }
1121 for (i = 0; i < num; i++) {
1122 node = &grp->nodes[i];
1123 scnprintf(node->name, sizeof(node->name), grp->format,
1124 i + 1);
1125 node->sda.index = (grp->option << 16) | (i & 0xffff);
1126 node->sda.dev_attr.show = grp->show;
1127 node->sda.dev_attr.store = grp->store;
1128 attr = &node->sda.dev_attr.attr;
1129 sysfs_attr_init(attr);
1130 attr->name = node->name;
1131 attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1132 ret = sysfs_create_file(&pdev->dev.kobj, attr);
1133 if (ret) {
1134 attr->name = NULL;
1135 goto out;
1136 }
1137 }
1138 }
1139
1140 return 0;
1141out:
1142 applesmc_destroy_nodes(groups);
1143 return ret;
1144}
1145
1146/* Create accelerometer resources */
1147static int applesmc_create_accelerometer(void)
1148{
1149 struct input_dev *idev;
1150 int ret;
1151
1152 if (!smcreg.has_accelerometer)
1153 return 0;
1154
1155 ret = applesmc_create_nodes(accelerometer_group, 1);
1156 if (ret)
1157 goto out;
1158
1159 applesmc_idev = input_allocate_polled_device();
1160 if (!applesmc_idev) {
1161 ret = -ENOMEM;
1162 goto out_sysfs;
1163 }
1164
1165 applesmc_idev->poll = applesmc_idev_poll;
1166 applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1167
1168 /* initial calibrate for the input device */
1169 applesmc_calibrate();
1170
1171 /* initialize the input device */
1172 idev = applesmc_idev->input;
1173 idev->name = "applesmc";
1174 idev->id.bustype = BUS_HOST;
1175 idev->dev.parent = &pdev->dev;
1176 idev->evbit[0] = BIT_MASK(EV_ABS);
1177 input_set_abs_params(idev, ABS_X,
1178 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1179 input_set_abs_params(idev, ABS_Y,
1180 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1181
1182 ret = input_register_polled_device(applesmc_idev);
1183 if (ret)
1184 goto out_idev;
1185
1186 return 0;
1187
1188out_idev:
1189 input_free_polled_device(applesmc_idev);
1190
1191out_sysfs:
1192 applesmc_destroy_nodes(accelerometer_group);
1193
1194out:
1195 pr_warn("driver init failed (ret=%d)!\n", ret);
1196 return ret;
1197}
1198
1199/* Release all resources used by the accelerometer */
1200static void applesmc_release_accelerometer(void)
1201{
1202 if (!smcreg.has_accelerometer)
1203 return;
1204 input_unregister_polled_device(applesmc_idev);
1205 input_free_polled_device(applesmc_idev);
1206 applesmc_destroy_nodes(accelerometer_group);
1207}
1208
1209static int applesmc_create_light_sensor(void)
1210{
1211 if (!smcreg.num_light_sensors)
1212 return 0;
1213 return applesmc_create_nodes(light_sensor_group, 1);
1214}
1215
1216static void applesmc_release_light_sensor(void)
1217{
1218 if (!smcreg.num_light_sensors)
1219 return;
1220 applesmc_destroy_nodes(light_sensor_group);
1221}
1222
1223static int applesmc_create_key_backlight(void)
1224{
1225 if (!smcreg.has_key_backlight)
1226 return 0;
1227 applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1228 if (!applesmc_led_wq)
1229 return -ENOMEM;
1230 return led_classdev_register(&pdev->dev, &applesmc_backlight);
1231}
1232
1233static void applesmc_release_key_backlight(void)
1234{
1235 if (!smcreg.has_key_backlight)
1236 return;
1237 led_classdev_unregister(&applesmc_backlight);
1238 destroy_workqueue(applesmc_led_wq);
1239}
1240
1241static int applesmc_dmi_match(const struct dmi_system_id *id)
1242{
1243 return 1;
1244}
1245
1246/*
1247 * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1248 * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1249 */
1250static const struct dmi_system_id applesmc_whitelist[] __initconst = {
1251 { applesmc_dmi_match, "Apple MacBook Air", {
1252 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1253 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1254 },
1255 { applesmc_dmi_match, "Apple MacBook Pro", {
1256 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1257 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1258 },
1259 { applesmc_dmi_match, "Apple MacBook", {
1260 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1261 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1262 },
1263 { applesmc_dmi_match, "Apple Macmini", {
1264 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1265 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1266 },
1267 { applesmc_dmi_match, "Apple MacPro", {
1268 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1269 DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1270 },
1271 { applesmc_dmi_match, "Apple iMac", {
1272 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1273 DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1274 },
1275 { .ident = NULL }
1276};
1277
1278static int __init applesmc_init(void)
1279{
1280 int ret;
1281
1282 if (!dmi_check_system(applesmc_whitelist)) {
1283 pr_warn("supported laptop not found!\n");
1284 ret = -ENODEV;
1285 goto out;
1286 }
1287
1288 if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1289 "applesmc")) {
1290 ret = -ENXIO;
1291 goto out;
1292 }
1293
1294 ret = platform_driver_register(&applesmc_driver);
1295 if (ret)
1296 goto out_region;
1297
1298 pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1299 NULL, 0);
1300 if (IS_ERR(pdev)) {
1301 ret = PTR_ERR(pdev);
1302 goto out_driver;
1303 }
1304
1305 /* create register cache */
1306 ret = applesmc_init_smcreg();
1307 if (ret)
1308 goto out_device;
1309
1310 ret = applesmc_create_nodes(info_group, 1);
1311 if (ret)
1312 goto out_smcreg;
1313
1314 ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1315 if (ret)
1316 goto out_info;
1317
1318 ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1319 if (ret)
1320 goto out_fans;
1321
1322 ret = applesmc_create_accelerometer();
1323 if (ret)
1324 goto out_temperature;
1325
1326 ret = applesmc_create_light_sensor();
1327 if (ret)
1328 goto out_accelerometer;
1329
1330 ret = applesmc_create_key_backlight();
1331 if (ret)
1332 goto out_light_sysfs;
1333
1334 hwmon_dev = hwmon_device_register(&pdev->dev);
1335 if (IS_ERR(hwmon_dev)) {
1336 ret = PTR_ERR(hwmon_dev);
1337 goto out_light_ledclass;
1338 }
1339
1340 return 0;
1341
1342out_light_ledclass:
1343 applesmc_release_key_backlight();
1344out_light_sysfs:
1345 applesmc_release_light_sensor();
1346out_accelerometer:
1347 applesmc_release_accelerometer();
1348out_temperature:
1349 applesmc_destroy_nodes(temp_group);
1350out_fans:
1351 applesmc_destroy_nodes(fan_group);
1352out_info:
1353 applesmc_destroy_nodes(info_group);
1354out_smcreg:
1355 applesmc_destroy_smcreg();
1356out_device:
1357 platform_device_unregister(pdev);
1358out_driver:
1359 platform_driver_unregister(&applesmc_driver);
1360out_region:
1361 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1362out:
1363 pr_warn("driver init failed (ret=%d)!\n", ret);
1364 return ret;
1365}
1366
1367static void __exit applesmc_exit(void)
1368{
1369 hwmon_device_unregister(hwmon_dev);
1370 applesmc_release_key_backlight();
1371 applesmc_release_light_sensor();
1372 applesmc_release_accelerometer();
1373 applesmc_destroy_nodes(temp_group);
1374 applesmc_destroy_nodes(fan_group);
1375 applesmc_destroy_nodes(info_group);
1376 applesmc_destroy_smcreg();
1377 platform_device_unregister(pdev);
1378 platform_driver_unregister(&applesmc_driver);
1379 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1380}
1381
1382module_init(applesmc_init);
1383module_exit(applesmc_exit);
1384
1385MODULE_AUTHOR("Nicolas Boichat");
1386MODULE_DESCRIPTION("Apple SMC");
1387MODULE_LICENSE("GPL v2");
1388MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);
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
47/* data port used by Apple SMC */
48#define APPLESMC_DATA_PORT 0x300
49/* command/status port used by Apple SMC */
50#define APPLESMC_CMD_PORT 0x304
51
52#define APPLESMC_NR_PORTS 32 /* 0x300-0x31f */
53
54#define APPLESMC_MAX_DATA_LENGTH 32
55
56/* wait up to 32 ms for a status change. */
57#define APPLESMC_MIN_WAIT 0x0040
58#define APPLESMC_MAX_WAIT 0x8000
59
60#define APPLESMC_STATUS_MASK 0x0f
61#define APPLESMC_READ_CMD 0x10
62#define APPLESMC_WRITE_CMD 0x11
63#define APPLESMC_GET_KEY_BY_INDEX_CMD 0x12
64#define APPLESMC_GET_KEY_TYPE_CMD 0x13
65
66#define KEY_COUNT_KEY "#KEY" /* r-o ui32 */
67
68#define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6-10 bytes) */
69#define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6-10 bytes) */
70#define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */
71
72#define CLAMSHELL_KEY "MSLD" /* r-o ui8 (unused) */
73
74#define MOTION_SENSOR_X_KEY "MO_X" /* r-o sp78 (2 bytes) */
75#define MOTION_SENSOR_Y_KEY "MO_Y" /* r-o sp78 (2 bytes) */
76#define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */
77#define MOTION_SENSOR_KEY "MOCN" /* r/w ui16 */
78
79#define FANS_COUNT "FNum" /* r-o ui8 */
80#define FANS_MANUAL "FS! " /* r-w ui16 */
81#define FAN_ID_FMT "F%dID" /* r-o char[16] */
82
83/* List of keys used to read/write fan speeds */
84static const char *const fan_speed_fmt[] = {
85 "F%dAc", /* actual speed */
86 "F%dMn", /* minimum speed (rw) */
87 "F%dMx", /* maximum speed */
88 "F%dSf", /* safe speed - not all models */
89 "F%dTg", /* target speed (manual: rw) */
90};
91
92#define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */
93#define INIT_WAIT_MSECS 50 /* ... in 50ms increments */
94
95#define APPLESMC_POLL_INTERVAL 50 /* msecs */
96#define APPLESMC_INPUT_FUZZ 4 /* input event threshold */
97#define APPLESMC_INPUT_FLAT 4
98
99#define SENSOR_X 0
100#define SENSOR_Y 1
101#define SENSOR_Z 2
102
103#define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
104#define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
105
106/* Dynamic device node attributes */
107struct applesmc_dev_attr {
108 struct sensor_device_attribute sda; /* hwmon attributes */
109 char name[32]; /* room for node file name */
110};
111
112/* Dynamic device node group */
113struct applesmc_node_group {
114 char *format; /* format string */
115 void *show; /* show function */
116 void *store; /* store function */
117 int option; /* function argument */
118 struct applesmc_dev_attr *nodes; /* dynamic node array */
119};
120
121/* AppleSMC entry - cached register information */
122struct applesmc_entry {
123 char key[5]; /* four-letter key code */
124 u8 valid; /* set when entry is successfully read once */
125 u8 len; /* bounded by APPLESMC_MAX_DATA_LENGTH */
126 char type[5]; /* four-letter type code */
127 u8 flags; /* 0x10: func; 0x40: write; 0x80: read */
128};
129
130/* Register lookup and registers common to all SMCs */
131static struct applesmc_registers {
132 struct mutex mutex; /* register read/write mutex */
133 unsigned int key_count; /* number of SMC registers */
134 unsigned int fan_count; /* number of fans */
135 unsigned int temp_count; /* number of temperature registers */
136 unsigned int temp_begin; /* temperature lower index bound */
137 unsigned int temp_end; /* temperature upper index bound */
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} smcreg = {
144 .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
145};
146
147static const int debug;
148static struct platform_device *pdev;
149static s16 rest_x;
150static s16 rest_y;
151static u8 backlight_state[2];
152
153static struct device *hwmon_dev;
154static struct input_polled_dev *applesmc_idev;
155
156/*
157 * Last index written to key_at_index sysfs file, and value to use for all other
158 * key_at_index_* sysfs files.
159 */
160static unsigned int key_at_index;
161
162static struct workqueue_struct *applesmc_led_wq;
163
164/*
165 * __wait_status - Wait up to 32ms for the status port to get a certain value
166 * (masked with 0x0f), returning zero if the value is obtained. Callers must
167 * hold applesmc_lock.
168 */
169static int __wait_status(u8 val)
170{
171 int us;
172
173 val = val & APPLESMC_STATUS_MASK;
174
175 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
176 udelay(us);
177 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val)
178 return 0;
179 }
180
181 return -EIO;
182}
183
184/*
185 * special treatment of command port - on newer macbooks, it seems necessary
186 * to resend the command byte before polling the status again. Callers must
187 * hold applesmc_lock.
188 */
189static int send_command(u8 cmd)
190{
191 int us;
192 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
193 outb(cmd, APPLESMC_CMD_PORT);
194 udelay(us);
195 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == 0x0c)
196 return 0;
197 }
198 return -EIO;
199}
200
201static int send_argument(const char *key)
202{
203 int i;
204
205 for (i = 0; i < 4; i++) {
206 outb(key[i], APPLESMC_DATA_PORT);
207 if (__wait_status(0x04))
208 return -EIO;
209 }
210 return 0;
211}
212
213static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
214{
215 int i;
216
217 if (send_command(cmd) || send_argument(key)) {
218 pr_warn("%.4s: read arg fail\n", key);
219 return -EIO;
220 }
221
222 outb(len, APPLESMC_DATA_PORT);
223
224 for (i = 0; i < len; i++) {
225 if (__wait_status(0x05)) {
226 pr_warn("%.4s: read data fail\n", key);
227 return -EIO;
228 }
229 buffer[i] = inb(APPLESMC_DATA_PORT);
230 }
231
232 return 0;
233}
234
235static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
236{
237 int i;
238
239 if (send_command(cmd) || send_argument(key)) {
240 pr_warn("%s: write arg fail\n", key);
241 return -EIO;
242 }
243
244 outb(len, APPLESMC_DATA_PORT);
245
246 for (i = 0; i < len; i++) {
247 if (__wait_status(0x04)) {
248 pr_warn("%s: write data fail\n", key);
249 return -EIO;
250 }
251 outb(buffer[i], APPLESMC_DATA_PORT);
252 }
253
254 return 0;
255}
256
257static int read_register_count(unsigned int *count)
258{
259 __be32 be;
260 int ret;
261
262 ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
263 if (ret)
264 return ret;
265
266 *count = be32_to_cpu(be);
267 return 0;
268}
269
270/*
271 * Serialized I/O
272 *
273 * Returns zero on success or a negative error on failure.
274 * All functions below are concurrency safe - callers should NOT hold lock.
275 */
276
277static int applesmc_read_entry(const struct applesmc_entry *entry,
278 u8 *buf, u8 len)
279{
280 int ret;
281
282 if (entry->len != len)
283 return -EINVAL;
284 mutex_lock(&smcreg.mutex);
285 ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
286 mutex_unlock(&smcreg.mutex);
287
288 return ret;
289}
290
291static int applesmc_write_entry(const struct applesmc_entry *entry,
292 const u8 *buf, u8 len)
293{
294 int ret;
295
296 if (entry->len != len)
297 return -EINVAL;
298 mutex_lock(&smcreg.mutex);
299 ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
300 mutex_unlock(&smcreg.mutex);
301 return ret;
302}
303
304static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
305{
306 struct applesmc_entry *cache = &smcreg.cache[index];
307 u8 key[4], info[6];
308 __be32 be;
309 int ret = 0;
310
311 if (cache->valid)
312 return cache;
313
314 mutex_lock(&smcreg.mutex);
315
316 if (cache->valid)
317 goto out;
318 be = cpu_to_be32(index);
319 ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
320 if (ret)
321 goto out;
322 ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
323 if (ret)
324 goto out;
325
326 memcpy(cache->key, key, 4);
327 cache->len = info[0];
328 memcpy(cache->type, &info[1], 4);
329 cache->flags = info[5];
330 cache->valid = 1;
331
332out:
333 mutex_unlock(&smcreg.mutex);
334 if (ret)
335 return ERR_PTR(ret);
336 return cache;
337}
338
339static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
340{
341 int begin = 0, end = smcreg.key_count;
342 const struct applesmc_entry *entry;
343
344 while (begin != end) {
345 int middle = begin + (end - begin) / 2;
346 entry = applesmc_get_entry_by_index(middle);
347 if (IS_ERR(entry)) {
348 *lo = 0;
349 return PTR_ERR(entry);
350 }
351 if (strcmp(entry->key, key) < 0)
352 begin = middle + 1;
353 else
354 end = middle;
355 }
356
357 *lo = begin;
358 return 0;
359}
360
361static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
362{
363 int begin = 0, end = smcreg.key_count;
364 const struct applesmc_entry *entry;
365
366 while (begin != end) {
367 int middle = begin + (end - begin) / 2;
368 entry = applesmc_get_entry_by_index(middle);
369 if (IS_ERR(entry)) {
370 *hi = smcreg.key_count;
371 return PTR_ERR(entry);
372 }
373 if (strcmp(key, entry->key) < 0)
374 end = middle;
375 else
376 begin = middle + 1;
377 }
378
379 *hi = begin;
380 return 0;
381}
382
383static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
384{
385 int begin, end;
386 int ret;
387
388 ret = applesmc_get_lower_bound(&begin, key);
389 if (ret)
390 return ERR_PTR(ret);
391 ret = applesmc_get_upper_bound(&end, key);
392 if (ret)
393 return ERR_PTR(ret);
394 if (end - begin != 1)
395 return ERR_PTR(-EINVAL);
396
397 return applesmc_get_entry_by_index(begin);
398}
399
400static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
401{
402 const struct applesmc_entry *entry;
403
404 entry = applesmc_get_entry_by_key(key);
405 if (IS_ERR(entry))
406 return PTR_ERR(entry);
407
408 return applesmc_read_entry(entry, buffer, len);
409}
410
411static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
412{
413 const struct applesmc_entry *entry;
414
415 entry = applesmc_get_entry_by_key(key);
416 if (IS_ERR(entry))
417 return PTR_ERR(entry);
418
419 return applesmc_write_entry(entry, buffer, len);
420}
421
422static int applesmc_has_key(const char *key, bool *value)
423{
424 const struct applesmc_entry *entry;
425
426 entry = applesmc_get_entry_by_key(key);
427 if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
428 return PTR_ERR(entry);
429
430 *value = !IS_ERR(entry);
431 return 0;
432}
433
434/*
435 * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z).
436 */
437static int applesmc_read_motion_sensor(int index, s16 *value)
438{
439 u8 buffer[2];
440 int ret;
441
442 switch (index) {
443 case SENSOR_X:
444 ret = applesmc_read_key(MOTION_SENSOR_X_KEY, buffer, 2);
445 break;
446 case SENSOR_Y:
447 ret = applesmc_read_key(MOTION_SENSOR_Y_KEY, buffer, 2);
448 break;
449 case SENSOR_Z:
450 ret = applesmc_read_key(MOTION_SENSOR_Z_KEY, buffer, 2);
451 break;
452 default:
453 ret = -EINVAL;
454 }
455
456 *value = ((s16)buffer[0] << 8) | buffer[1];
457
458 return ret;
459}
460
461/*
462 * applesmc_device_init - initialize the accelerometer. Can sleep.
463 */
464static void applesmc_device_init(void)
465{
466 int total;
467 u8 buffer[2];
468
469 if (!smcreg.has_accelerometer)
470 return;
471
472 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
473 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
474 (buffer[0] != 0x00 || buffer[1] != 0x00))
475 return;
476 buffer[0] = 0xe0;
477 buffer[1] = 0x00;
478 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
479 msleep(INIT_WAIT_MSECS);
480 }
481
482 pr_warn("failed to init the device\n");
483}
484
485/*
486 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
487 */
488static int applesmc_init_smcreg_try(void)
489{
490 struct applesmc_registers *s = &smcreg;
491 bool left_light_sensor, right_light_sensor;
492 u8 tmp[1];
493 int ret;
494
495 if (s->init_complete)
496 return 0;
497
498 ret = read_register_count(&s->key_count);
499 if (ret)
500 return ret;
501
502 if (!s->cache)
503 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
504 if (!s->cache)
505 return -ENOMEM;
506
507 ret = applesmc_read_key(FANS_COUNT, tmp, 1);
508 if (ret)
509 return ret;
510 s->fan_count = tmp[0];
511
512 ret = applesmc_get_lower_bound(&s->temp_begin, "T");
513 if (ret)
514 return ret;
515 ret = applesmc_get_lower_bound(&s->temp_end, "U");
516 if (ret)
517 return ret;
518 s->temp_count = s->temp_end - s->temp_begin;
519
520 ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
521 if (ret)
522 return ret;
523 ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
524 if (ret)
525 return ret;
526 ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
527 if (ret)
528 return ret;
529 ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
530 if (ret)
531 return ret;
532
533 s->num_light_sensors = left_light_sensor + right_light_sensor;
534 s->init_complete = true;
535
536 pr_info("key=%d fan=%d temp=%d acc=%d lux=%d kbd=%d\n",
537 s->key_count, s->fan_count, s->temp_count,
538 s->has_accelerometer,
539 s->num_light_sensors,
540 s->has_key_backlight);
541
542 return 0;
543}
544
545/*
546 * applesmc_init_smcreg - Initialize register cache.
547 *
548 * Retries until initialization is successful, or the operation times out.
549 *
550 */
551static int applesmc_init_smcreg(void)
552{
553 int ms, ret;
554
555 for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
556 ret = applesmc_init_smcreg_try();
557 if (!ret) {
558 if (ms)
559 pr_info("init_smcreg() took %d ms\n", ms);
560 return 0;
561 }
562 msleep(INIT_WAIT_MSECS);
563 }
564
565 kfree(smcreg.cache);
566 smcreg.cache = NULL;
567
568 return ret;
569}
570
571static void applesmc_destroy_smcreg(void)
572{
573 kfree(smcreg.cache);
574 smcreg.cache = NULL;
575 smcreg.init_complete = false;
576}
577
578/* Device model stuff */
579static int applesmc_probe(struct platform_device *dev)
580{
581 int ret;
582
583 ret = applesmc_init_smcreg();
584 if (ret)
585 return ret;
586
587 applesmc_device_init();
588
589 return 0;
590}
591
592/* Synchronize device with memorized backlight state */
593static int applesmc_pm_resume(struct device *dev)
594{
595 if (smcreg.has_key_backlight)
596 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
597 return 0;
598}
599
600/* Reinitialize device on resume from hibernation */
601static int applesmc_pm_restore(struct device *dev)
602{
603 applesmc_device_init();
604 return applesmc_pm_resume(dev);
605}
606
607static const struct dev_pm_ops applesmc_pm_ops = {
608 .resume = applesmc_pm_resume,
609 .restore = applesmc_pm_restore,
610};
611
612static struct platform_driver applesmc_driver = {
613 .probe = applesmc_probe,
614 .driver = {
615 .name = "applesmc",
616 .owner = THIS_MODULE,
617 .pm = &applesmc_pm_ops,
618 },
619};
620
621/*
622 * applesmc_calibrate - Set our "resting" values. Callers must
623 * hold applesmc_lock.
624 */
625static void applesmc_calibrate(void)
626{
627 applesmc_read_motion_sensor(SENSOR_X, &rest_x);
628 applesmc_read_motion_sensor(SENSOR_Y, &rest_y);
629 rest_x = -rest_x;
630}
631
632static void applesmc_idev_poll(struct input_polled_dev *dev)
633{
634 struct input_dev *idev = dev->input;
635 s16 x, y;
636
637 if (applesmc_read_motion_sensor(SENSOR_X, &x))
638 return;
639 if (applesmc_read_motion_sensor(SENSOR_Y, &y))
640 return;
641
642 x = -x;
643 input_report_abs(idev, ABS_X, x - rest_x);
644 input_report_abs(idev, ABS_Y, y - rest_y);
645 input_sync(idev);
646}
647
648/* Sysfs Files */
649
650static ssize_t applesmc_name_show(struct device *dev,
651 struct device_attribute *attr, char *buf)
652{
653 return snprintf(buf, PAGE_SIZE, "applesmc\n");
654}
655
656static ssize_t applesmc_position_show(struct device *dev,
657 struct device_attribute *attr, char *buf)
658{
659 int ret;
660 s16 x, y, z;
661
662 ret = applesmc_read_motion_sensor(SENSOR_X, &x);
663 if (ret)
664 goto out;
665 ret = applesmc_read_motion_sensor(SENSOR_Y, &y);
666 if (ret)
667 goto out;
668 ret = applesmc_read_motion_sensor(SENSOR_Z, &z);
669 if (ret)
670 goto out;
671
672out:
673 if (ret)
674 return ret;
675 else
676 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
677}
678
679static ssize_t applesmc_light_show(struct device *dev,
680 struct device_attribute *attr, char *sysfsbuf)
681{
682 const struct applesmc_entry *entry;
683 static int data_length;
684 int ret;
685 u8 left = 0, right = 0;
686 u8 buffer[10];
687
688 if (!data_length) {
689 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
690 if (IS_ERR(entry))
691 return PTR_ERR(entry);
692 if (entry->len > 10)
693 return -ENXIO;
694 data_length = entry->len;
695 pr_info("light sensor data length set to %d\n", data_length);
696 }
697
698 ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
699 /* newer macbooks report a single 10-bit bigendian value */
700 if (data_length == 10) {
701 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
702 goto out;
703 }
704 left = buffer[2];
705 if (ret)
706 goto out;
707 ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
708 right = buffer[2];
709
710out:
711 if (ret)
712 return ret;
713 else
714 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
715}
716
717/* Displays sensor key as label */
718static ssize_t applesmc_show_sensor_label(struct device *dev,
719 struct device_attribute *devattr, char *sysfsbuf)
720{
721 int index = smcreg.temp_begin + to_index(devattr);
722 const struct applesmc_entry *entry;
723
724 entry = applesmc_get_entry_by_index(index);
725 if (IS_ERR(entry))
726 return PTR_ERR(entry);
727
728 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
729}
730
731/* Displays degree Celsius * 1000 */
732static ssize_t applesmc_show_temperature(struct device *dev,
733 struct device_attribute *devattr, char *sysfsbuf)
734{
735 int index = smcreg.temp_begin + to_index(devattr);
736 const struct applesmc_entry *entry;
737 int ret;
738 u8 buffer[2];
739 unsigned int temp;
740
741 entry = applesmc_get_entry_by_index(index);
742 if (IS_ERR(entry))
743 return PTR_ERR(entry);
744 if (entry->len > 2)
745 return -EINVAL;
746
747 ret = applesmc_read_entry(entry, buffer, entry->len);
748 if (ret)
749 return ret;
750
751 if (entry->len == 2) {
752 temp = buffer[0] * 1000;
753 temp += (buffer[1] >> 6) * 250;
754 } else {
755 temp = buffer[0] * 4000;
756 }
757
758 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", temp);
759}
760
761static ssize_t applesmc_show_fan_speed(struct device *dev,
762 struct device_attribute *attr, char *sysfsbuf)
763{
764 int ret;
765 unsigned int speed = 0;
766 char newkey[5];
767 u8 buffer[2];
768
769 sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
770
771 ret = applesmc_read_key(newkey, buffer, 2);
772 speed = ((buffer[0] << 8 | buffer[1]) >> 2);
773
774 if (ret)
775 return ret;
776 else
777 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
778}
779
780static ssize_t applesmc_store_fan_speed(struct device *dev,
781 struct device_attribute *attr,
782 const char *sysfsbuf, size_t count)
783{
784 int ret;
785 unsigned long speed;
786 char newkey[5];
787 u8 buffer[2];
788
789 if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
790 return -EINVAL; /* Bigger than a 14-bit value */
791
792 sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
793
794 buffer[0] = (speed >> 6) & 0xff;
795 buffer[1] = (speed << 2) & 0xff;
796 ret = applesmc_write_key(newkey, buffer, 2);
797
798 if (ret)
799 return ret;
800 else
801 return count;
802}
803
804static ssize_t applesmc_show_fan_manual(struct device *dev,
805 struct device_attribute *attr, char *sysfsbuf)
806{
807 int ret;
808 u16 manual = 0;
809 u8 buffer[2];
810
811 ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
812 manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
813
814 if (ret)
815 return ret;
816 else
817 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
818}
819
820static ssize_t applesmc_store_fan_manual(struct device *dev,
821 struct device_attribute *attr,
822 const char *sysfsbuf, size_t count)
823{
824 int ret;
825 u8 buffer[2];
826 unsigned long input;
827 u16 val;
828
829 if (kstrtoul(sysfsbuf, 10, &input) < 0)
830 return -EINVAL;
831
832 ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
833 val = (buffer[0] << 8 | buffer[1]);
834 if (ret)
835 goto out;
836
837 if (input)
838 val = val | (0x01 << to_index(attr));
839 else
840 val = val & ~(0x01 << to_index(attr));
841
842 buffer[0] = (val >> 8) & 0xFF;
843 buffer[1] = val & 0xFF;
844
845 ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
846
847out:
848 if (ret)
849 return ret;
850 else
851 return count;
852}
853
854static ssize_t applesmc_show_fan_position(struct device *dev,
855 struct device_attribute *attr, char *sysfsbuf)
856{
857 int ret;
858 char newkey[5];
859 u8 buffer[17];
860
861 sprintf(newkey, FAN_ID_FMT, to_index(attr));
862
863 ret = applesmc_read_key(newkey, buffer, 16);
864 buffer[16] = 0;
865
866 if (ret)
867 return ret;
868 else
869 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
870}
871
872static ssize_t applesmc_calibrate_show(struct device *dev,
873 struct device_attribute *attr, char *sysfsbuf)
874{
875 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
876}
877
878static ssize_t applesmc_calibrate_store(struct device *dev,
879 struct device_attribute *attr, const char *sysfsbuf, size_t count)
880{
881 applesmc_calibrate();
882
883 return count;
884}
885
886static void applesmc_backlight_set(struct work_struct *work)
887{
888 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
889}
890static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
891
892static void applesmc_brightness_set(struct led_classdev *led_cdev,
893 enum led_brightness value)
894{
895 int ret;
896
897 backlight_state[0] = value;
898 ret = queue_work(applesmc_led_wq, &backlight_work);
899
900 if (debug && (!ret))
901 printk(KERN_DEBUG "applesmc: work was already on the queue.\n");
902}
903
904static ssize_t applesmc_key_count_show(struct device *dev,
905 struct device_attribute *attr, char *sysfsbuf)
906{
907 int ret;
908 u8 buffer[4];
909 u32 count;
910
911 ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
912 count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
913 ((u32)buffer[2]<<8) + buffer[3];
914
915 if (ret)
916 return ret;
917 else
918 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
919}
920
921static ssize_t applesmc_key_at_index_read_show(struct device *dev,
922 struct device_attribute *attr, char *sysfsbuf)
923{
924 const struct applesmc_entry *entry;
925 int ret;
926
927 entry = applesmc_get_entry_by_index(key_at_index);
928 if (IS_ERR(entry))
929 return PTR_ERR(entry);
930 ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
931 if (ret)
932 return ret;
933
934 return entry->len;
935}
936
937static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
938 struct device_attribute *attr, char *sysfsbuf)
939{
940 const struct applesmc_entry *entry;
941
942 entry = applesmc_get_entry_by_index(key_at_index);
943 if (IS_ERR(entry))
944 return PTR_ERR(entry);
945
946 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
947}
948
949static ssize_t applesmc_key_at_index_type_show(struct device *dev,
950 struct device_attribute *attr, char *sysfsbuf)
951{
952 const struct applesmc_entry *entry;
953
954 entry = applesmc_get_entry_by_index(key_at_index);
955 if (IS_ERR(entry))
956 return PTR_ERR(entry);
957
958 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
959}
960
961static ssize_t applesmc_key_at_index_name_show(struct device *dev,
962 struct device_attribute *attr, char *sysfsbuf)
963{
964 const struct applesmc_entry *entry;
965
966 entry = applesmc_get_entry_by_index(key_at_index);
967 if (IS_ERR(entry))
968 return PTR_ERR(entry);
969
970 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
971}
972
973static ssize_t applesmc_key_at_index_show(struct device *dev,
974 struct device_attribute *attr, char *sysfsbuf)
975{
976 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
977}
978
979static ssize_t applesmc_key_at_index_store(struct device *dev,
980 struct device_attribute *attr, const char *sysfsbuf, size_t count)
981{
982 unsigned long newkey;
983
984 if (kstrtoul(sysfsbuf, 10, &newkey) < 0
985 || newkey >= smcreg.key_count)
986 return -EINVAL;
987
988 key_at_index = newkey;
989 return count;
990}
991
992static struct led_classdev applesmc_backlight = {
993 .name = "smc::kbd_backlight",
994 .default_trigger = "nand-disk",
995 .brightness_set = applesmc_brightness_set,
996};
997
998static struct applesmc_node_group info_group[] = {
999 { "name", applesmc_name_show },
1000 { "key_count", applesmc_key_count_show },
1001 { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1002 { "key_at_index_name", applesmc_key_at_index_name_show },
1003 { "key_at_index_type", applesmc_key_at_index_type_show },
1004 { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1005 { "key_at_index_data", applesmc_key_at_index_read_show },
1006 { }
1007};
1008
1009static struct applesmc_node_group accelerometer_group[] = {
1010 { "position", applesmc_position_show },
1011 { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1012 { }
1013};
1014
1015static struct applesmc_node_group light_sensor_group[] = {
1016 { "light", applesmc_light_show },
1017 { }
1018};
1019
1020static struct applesmc_node_group fan_group[] = {
1021 { "fan%d_label", applesmc_show_fan_position },
1022 { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1023 { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1024 { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1025 { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1026 { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1027 { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1028 { }
1029};
1030
1031static struct applesmc_node_group temp_group[] = {
1032 { "temp%d_label", applesmc_show_sensor_label },
1033 { "temp%d_input", applesmc_show_temperature },
1034 { }
1035};
1036
1037/* Module stuff */
1038
1039/*
1040 * applesmc_destroy_nodes - remove files and free associated memory
1041 */
1042static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1043{
1044 struct applesmc_node_group *grp;
1045 struct applesmc_dev_attr *node;
1046
1047 for (grp = groups; grp->nodes; grp++) {
1048 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1049 sysfs_remove_file(&pdev->dev.kobj,
1050 &node->sda.dev_attr.attr);
1051 kfree(grp->nodes);
1052 grp->nodes = NULL;
1053 }
1054}
1055
1056/*
1057 * applesmc_create_nodes - create a two-dimensional group of sysfs files
1058 */
1059static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1060{
1061 struct applesmc_node_group *grp;
1062 struct applesmc_dev_attr *node;
1063 struct attribute *attr;
1064 int ret, i;
1065
1066 for (grp = groups; grp->format; grp++) {
1067 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1068 if (!grp->nodes) {
1069 ret = -ENOMEM;
1070 goto out;
1071 }
1072 for (i = 0; i < num; i++) {
1073 node = &grp->nodes[i];
1074 sprintf(node->name, grp->format, i + 1);
1075 node->sda.index = (grp->option << 16) | (i & 0xffff);
1076 node->sda.dev_attr.show = grp->show;
1077 node->sda.dev_attr.store = grp->store;
1078 attr = &node->sda.dev_attr.attr;
1079 sysfs_attr_init(attr);
1080 attr->name = node->name;
1081 attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1082 ret = sysfs_create_file(&pdev->dev.kobj, attr);
1083 if (ret) {
1084 attr->name = NULL;
1085 goto out;
1086 }
1087 }
1088 }
1089
1090 return 0;
1091out:
1092 applesmc_destroy_nodes(groups);
1093 return ret;
1094}
1095
1096/* Create accelerometer ressources */
1097static int applesmc_create_accelerometer(void)
1098{
1099 struct input_dev *idev;
1100 int ret;
1101
1102 if (!smcreg.has_accelerometer)
1103 return 0;
1104
1105 ret = applesmc_create_nodes(accelerometer_group, 1);
1106 if (ret)
1107 goto out;
1108
1109 applesmc_idev = input_allocate_polled_device();
1110 if (!applesmc_idev) {
1111 ret = -ENOMEM;
1112 goto out_sysfs;
1113 }
1114
1115 applesmc_idev->poll = applesmc_idev_poll;
1116 applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1117
1118 /* initial calibrate for the input device */
1119 applesmc_calibrate();
1120
1121 /* initialize the input device */
1122 idev = applesmc_idev->input;
1123 idev->name = "applesmc";
1124 idev->id.bustype = BUS_HOST;
1125 idev->dev.parent = &pdev->dev;
1126 idev->evbit[0] = BIT_MASK(EV_ABS);
1127 input_set_abs_params(idev, ABS_X,
1128 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1129 input_set_abs_params(idev, ABS_Y,
1130 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1131
1132 ret = input_register_polled_device(applesmc_idev);
1133 if (ret)
1134 goto out_idev;
1135
1136 return 0;
1137
1138out_idev:
1139 input_free_polled_device(applesmc_idev);
1140
1141out_sysfs:
1142 applesmc_destroy_nodes(accelerometer_group);
1143
1144out:
1145 pr_warn("driver init failed (ret=%d)!\n", ret);
1146 return ret;
1147}
1148
1149/* Release all ressources used by the accelerometer */
1150static void applesmc_release_accelerometer(void)
1151{
1152 if (!smcreg.has_accelerometer)
1153 return;
1154 input_unregister_polled_device(applesmc_idev);
1155 input_free_polled_device(applesmc_idev);
1156 applesmc_destroy_nodes(accelerometer_group);
1157}
1158
1159static int applesmc_create_light_sensor(void)
1160{
1161 if (!smcreg.num_light_sensors)
1162 return 0;
1163 return applesmc_create_nodes(light_sensor_group, 1);
1164}
1165
1166static void applesmc_release_light_sensor(void)
1167{
1168 if (!smcreg.num_light_sensors)
1169 return;
1170 applesmc_destroy_nodes(light_sensor_group);
1171}
1172
1173static int applesmc_create_key_backlight(void)
1174{
1175 if (!smcreg.has_key_backlight)
1176 return 0;
1177 applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1178 if (!applesmc_led_wq)
1179 return -ENOMEM;
1180 return led_classdev_register(&pdev->dev, &applesmc_backlight);
1181}
1182
1183static void applesmc_release_key_backlight(void)
1184{
1185 if (!smcreg.has_key_backlight)
1186 return;
1187 led_classdev_unregister(&applesmc_backlight);
1188 destroy_workqueue(applesmc_led_wq);
1189}
1190
1191static int applesmc_dmi_match(const struct dmi_system_id *id)
1192{
1193 return 1;
1194}
1195
1196/*
1197 * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1198 * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1199 */
1200static __initdata struct dmi_system_id applesmc_whitelist[] = {
1201 { applesmc_dmi_match, "Apple MacBook Air", {
1202 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1203 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1204 },
1205 { applesmc_dmi_match, "Apple MacBook Pro", {
1206 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1207 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1208 },
1209 { applesmc_dmi_match, "Apple MacBook", {
1210 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1211 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1212 },
1213 { applesmc_dmi_match, "Apple Macmini", {
1214 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1215 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1216 },
1217 { applesmc_dmi_match, "Apple MacPro", {
1218 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1219 DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1220 },
1221 { applesmc_dmi_match, "Apple iMac", {
1222 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1223 DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1224 },
1225 { .ident = NULL }
1226};
1227
1228static int __init applesmc_init(void)
1229{
1230 int ret;
1231
1232 if (!dmi_check_system(applesmc_whitelist)) {
1233 pr_warn("supported laptop not found!\n");
1234 ret = -ENODEV;
1235 goto out;
1236 }
1237
1238 if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1239 "applesmc")) {
1240 ret = -ENXIO;
1241 goto out;
1242 }
1243
1244 ret = platform_driver_register(&applesmc_driver);
1245 if (ret)
1246 goto out_region;
1247
1248 pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1249 NULL, 0);
1250 if (IS_ERR(pdev)) {
1251 ret = PTR_ERR(pdev);
1252 goto out_driver;
1253 }
1254
1255 /* create register cache */
1256 ret = applesmc_init_smcreg();
1257 if (ret)
1258 goto out_device;
1259
1260 ret = applesmc_create_nodes(info_group, 1);
1261 if (ret)
1262 goto out_smcreg;
1263
1264 ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1265 if (ret)
1266 goto out_info;
1267
1268 ret = applesmc_create_nodes(temp_group, smcreg.temp_count);
1269 if (ret)
1270 goto out_fans;
1271
1272 ret = applesmc_create_accelerometer();
1273 if (ret)
1274 goto out_temperature;
1275
1276 ret = applesmc_create_light_sensor();
1277 if (ret)
1278 goto out_accelerometer;
1279
1280 ret = applesmc_create_key_backlight();
1281 if (ret)
1282 goto out_light_sysfs;
1283
1284 hwmon_dev = hwmon_device_register(&pdev->dev);
1285 if (IS_ERR(hwmon_dev)) {
1286 ret = PTR_ERR(hwmon_dev);
1287 goto out_light_ledclass;
1288 }
1289
1290 return 0;
1291
1292out_light_ledclass:
1293 applesmc_release_key_backlight();
1294out_light_sysfs:
1295 applesmc_release_light_sensor();
1296out_accelerometer:
1297 applesmc_release_accelerometer();
1298out_temperature:
1299 applesmc_destroy_nodes(temp_group);
1300out_fans:
1301 applesmc_destroy_nodes(fan_group);
1302out_info:
1303 applesmc_destroy_nodes(info_group);
1304out_smcreg:
1305 applesmc_destroy_smcreg();
1306out_device:
1307 platform_device_unregister(pdev);
1308out_driver:
1309 platform_driver_unregister(&applesmc_driver);
1310out_region:
1311 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1312out:
1313 pr_warn("driver init failed (ret=%d)!\n", ret);
1314 return ret;
1315}
1316
1317static void __exit applesmc_exit(void)
1318{
1319 hwmon_device_unregister(hwmon_dev);
1320 applesmc_release_key_backlight();
1321 applesmc_release_light_sensor();
1322 applesmc_release_accelerometer();
1323 applesmc_destroy_nodes(temp_group);
1324 applesmc_destroy_nodes(fan_group);
1325 applesmc_destroy_nodes(info_group);
1326 applesmc_destroy_smcreg();
1327 platform_device_unregister(pdev);
1328 platform_driver_unregister(&applesmc_driver);
1329 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1330}
1331
1332module_init(applesmc_init);
1333module_exit(applesmc_exit);
1334
1335MODULE_AUTHOR("Nicolas Boichat");
1336MODULE_DESCRIPTION("Apple SMC");
1337MODULE_LICENSE("GPL v2");
1338MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);