Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
4 * sensors, fan control, keyboard backlight control) used in Intel-based Apple
5 * computers.
6 *
7 * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
8 * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
9 *
10 * Based on hdaps.c driver:
11 * Copyright (C) 2005 Robert Love <rml@novell.com>
12 * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
13 *
14 * Fan control based on smcFanControl:
15 * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
16 */
17
18#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19
20#include <linux/delay.h>
21#include <linux/platform_device.h>
22#include <linux/input.h>
23#include <linux/kernel.h>
24#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/timer.h>
27#include <linux/dmi.h>
28#include <linux/mutex.h>
29#include <linux/hwmon-sysfs.h>
30#include <linux/io.h>
31#include <linux/leds.h>
32#include <linux/hwmon.h>
33#include <linux/workqueue.h>
34#include <linux/err.h>
35
36/* data port used by Apple SMC */
37#define APPLESMC_DATA_PORT 0x300
38/* command/status port used by Apple SMC */
39#define APPLESMC_CMD_PORT 0x304
40
41#define APPLESMC_NR_PORTS 32 /* 0x300-0x31f */
42
43#define APPLESMC_MAX_DATA_LENGTH 32
44
45/* wait up to 128 ms for a status change. */
46#define APPLESMC_MIN_WAIT 0x0010
47#define APPLESMC_RETRY_WAIT 0x0100
48#define APPLESMC_MAX_WAIT 0x20000
49
50#define APPLESMC_READ_CMD 0x10
51#define APPLESMC_WRITE_CMD 0x11
52#define APPLESMC_GET_KEY_BY_INDEX_CMD 0x12
53#define APPLESMC_GET_KEY_TYPE_CMD 0x13
54
55#define KEY_COUNT_KEY "#KEY" /* r-o ui32 */
56
57#define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6-10 bytes) */
58#define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6-10 bytes) */
59#define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */
60
61#define CLAMSHELL_KEY "MSLD" /* r-o ui8 (unused) */
62
63#define MOTION_SENSOR_X_KEY "MO_X" /* r-o sp78 (2 bytes) */
64#define MOTION_SENSOR_Y_KEY "MO_Y" /* r-o sp78 (2 bytes) */
65#define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */
66#define MOTION_SENSOR_KEY "MOCN" /* r/w ui16 */
67
68#define FANS_COUNT "FNum" /* r-o ui8 */
69#define FANS_MANUAL "FS! " /* r-w ui16 */
70#define FAN_ID_FMT "F%dID" /* r-o char[16] */
71
72#define TEMP_SENSOR_TYPE "sp78"
73
74/* List of keys used to read/write fan speeds */
75static const char *const fan_speed_fmt[] = {
76 "F%dAc", /* actual speed */
77 "F%dMn", /* minimum speed (rw) */
78 "F%dMx", /* maximum speed */
79 "F%dSf", /* safe speed - not all models */
80 "F%dTg", /* target speed (manual: rw) */
81};
82
83#define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */
84#define INIT_WAIT_MSECS 50 /* ... in 50ms increments */
85
86#define APPLESMC_POLL_INTERVAL 50 /* msecs */
87#define APPLESMC_INPUT_FUZZ 4 /* input event threshold */
88#define APPLESMC_INPUT_FLAT 4
89
90#define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
91#define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
92
93/* Dynamic device node attributes */
94struct applesmc_dev_attr {
95 struct sensor_device_attribute sda; /* hwmon attributes */
96 char name[32]; /* room for node file name */
97};
98
99/* Dynamic device node group */
100struct applesmc_node_group {
101 char *format; /* format string */
102 void *show; /* show function */
103 void *store; /* store function */
104 int option; /* function argument */
105 struct applesmc_dev_attr *nodes; /* dynamic node array */
106};
107
108/* AppleSMC entry - cached register information */
109struct applesmc_entry {
110 char key[5]; /* four-letter key code */
111 u8 valid; /* set when entry is successfully read once */
112 u8 len; /* bounded by APPLESMC_MAX_DATA_LENGTH */
113 char type[5]; /* four-letter type code */
114 u8 flags; /* 0x10: func; 0x40: write; 0x80: read */
115};
116
117/* Register lookup and registers common to all SMCs */
118static struct applesmc_registers {
119 struct mutex mutex; /* register read/write mutex */
120 unsigned int key_count; /* number of SMC registers */
121 unsigned int fan_count; /* number of fans */
122 unsigned int temp_count; /* number of temperature registers */
123 unsigned int temp_begin; /* temperature lower index bound */
124 unsigned int temp_end; /* temperature upper index bound */
125 unsigned int index_count; /* size of temperature index array */
126 int num_light_sensors; /* number of light sensors */
127 bool has_accelerometer; /* has motion sensor */
128 bool has_key_backlight; /* has keyboard backlight */
129 bool init_complete; /* true when fully initialized */
130 struct applesmc_entry *cache; /* cached key entries */
131 const char **index; /* temperature key index */
132} smcreg = {
133 .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
134};
135
136static const int debug;
137static struct platform_device *pdev;
138static s16 rest_x;
139static s16 rest_y;
140static u8 backlight_state[2];
141
142static struct device *hwmon_dev;
143static struct input_dev *applesmc_idev;
144
145/*
146 * Last index written to key_at_index sysfs file, and value to use for all other
147 * key_at_index_* sysfs files.
148 */
149static unsigned int key_at_index;
150
151static struct workqueue_struct *applesmc_led_wq;
152
153/*
154 * wait_read - Wait for a byte to appear on SMC port. Callers must
155 * hold applesmc_lock.
156 */
157static int wait_read(void)
158{
159 unsigned long end = jiffies + (APPLESMC_MAX_WAIT * HZ) / USEC_PER_SEC;
160 u8 status;
161 int us;
162
163 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
164 usleep_range(us, us * 16);
165 status = inb(APPLESMC_CMD_PORT);
166 /* read: wait for smc to settle */
167 if (status & 0x01)
168 return 0;
169 /* timeout: give up */
170 if (time_after(jiffies, end))
171 break;
172 }
173
174 pr_warn("wait_read() fail: 0x%02x\n", status);
175 return -EIO;
176}
177
178/*
179 * send_byte - Write to SMC port, retrying when necessary. Callers
180 * must hold applesmc_lock.
181 */
182static int send_byte(u8 cmd, u16 port)
183{
184 u8 status;
185 int us;
186 unsigned long end = jiffies + (APPLESMC_MAX_WAIT * HZ) / USEC_PER_SEC;
187
188 outb(cmd, port);
189 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
190 usleep_range(us, us * 16);
191 status = inb(APPLESMC_CMD_PORT);
192 /* write: wait for smc to settle */
193 if (status & 0x02)
194 continue;
195 /* ready: cmd accepted, return */
196 if (status & 0x04)
197 return 0;
198 /* timeout: give up */
199 if (time_after(jiffies, end))
200 break;
201 /* busy: long wait and resend */
202 udelay(APPLESMC_RETRY_WAIT);
203 outb(cmd, port);
204 }
205
206 pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status);
207 return -EIO;
208}
209
210static int send_command(u8 cmd)
211{
212 return send_byte(cmd, APPLESMC_CMD_PORT);
213}
214
215static int send_argument(const char *key)
216{
217 int i;
218
219 for (i = 0; i < 4; i++)
220 if (send_byte(key[i], APPLESMC_DATA_PORT))
221 return -EIO;
222 return 0;
223}
224
225static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
226{
227 u8 status, data = 0;
228 int i;
229
230 if (send_command(cmd) || send_argument(key)) {
231 pr_warn("%.4s: read arg fail\n", key);
232 return -EIO;
233 }
234
235 /* This has no effect on newer (2012) SMCs */
236 if (send_byte(len, APPLESMC_DATA_PORT)) {
237 pr_warn("%.4s: read len fail\n", key);
238 return -EIO;
239 }
240
241 for (i = 0; i < len; i++) {
242 if (wait_read()) {
243 pr_warn("%.4s: read data[%d] fail\n", key, i);
244 return -EIO;
245 }
246 buffer[i] = inb(APPLESMC_DATA_PORT);
247 }
248
249 /* Read the data port until bit0 is cleared */
250 for (i = 0; i < 16; i++) {
251 udelay(APPLESMC_MIN_WAIT);
252 status = inb(APPLESMC_CMD_PORT);
253 if (!(status & 0x01))
254 break;
255 data = inb(APPLESMC_DATA_PORT);
256 }
257 if (i)
258 pr_warn("flushed %d bytes, last value is: %d\n", i, data);
259
260 return 0;
261}
262
263static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
264{
265 int i;
266
267 if (send_command(cmd) || send_argument(key)) {
268 pr_warn("%s: write arg fail\n", key);
269 return -EIO;
270 }
271
272 if (send_byte(len, APPLESMC_DATA_PORT)) {
273 pr_warn("%.4s: write len fail\n", key);
274 return -EIO;
275 }
276
277 for (i = 0; i < len; i++) {
278 if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
279 pr_warn("%s: write data fail\n", key);
280 return -EIO;
281 }
282 }
283
284 return 0;
285}
286
287static int read_register_count(unsigned int *count)
288{
289 __be32 be;
290 int ret;
291
292 ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
293 if (ret)
294 return ret;
295
296 *count = be32_to_cpu(be);
297 return 0;
298}
299
300/*
301 * Serialized I/O
302 *
303 * Returns zero on success or a negative error on failure.
304 * All functions below are concurrency safe - callers should NOT hold lock.
305 */
306
307static int applesmc_read_entry(const struct applesmc_entry *entry,
308 u8 *buf, u8 len)
309{
310 int ret;
311
312 if (entry->len != len)
313 return -EINVAL;
314 mutex_lock(&smcreg.mutex);
315 ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
316 mutex_unlock(&smcreg.mutex);
317
318 return ret;
319}
320
321static int applesmc_write_entry(const struct applesmc_entry *entry,
322 const u8 *buf, u8 len)
323{
324 int ret;
325
326 if (entry->len != len)
327 return -EINVAL;
328 mutex_lock(&smcreg.mutex);
329 ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
330 mutex_unlock(&smcreg.mutex);
331 return ret;
332}
333
334static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
335{
336 struct applesmc_entry *cache = &smcreg.cache[index];
337 u8 key[4], info[6];
338 __be32 be;
339 int ret = 0;
340
341 if (cache->valid)
342 return cache;
343
344 mutex_lock(&smcreg.mutex);
345
346 if (cache->valid)
347 goto out;
348 be = cpu_to_be32(index);
349 ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
350 if (ret)
351 goto out;
352 ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
353 if (ret)
354 goto out;
355
356 memcpy(cache->key, key, 4);
357 cache->len = info[0];
358 memcpy(cache->type, &info[1], 4);
359 cache->flags = info[5];
360 cache->valid = 1;
361
362out:
363 mutex_unlock(&smcreg.mutex);
364 if (ret)
365 return ERR_PTR(ret);
366 return cache;
367}
368
369static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
370{
371 int begin = 0, end = smcreg.key_count;
372 const struct applesmc_entry *entry;
373
374 while (begin != end) {
375 int middle = begin + (end - begin) / 2;
376 entry = applesmc_get_entry_by_index(middle);
377 if (IS_ERR(entry)) {
378 *lo = 0;
379 return PTR_ERR(entry);
380 }
381 if (strcmp(entry->key, key) < 0)
382 begin = middle + 1;
383 else
384 end = middle;
385 }
386
387 *lo = begin;
388 return 0;
389}
390
391static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
392{
393 int begin = 0, end = smcreg.key_count;
394 const struct applesmc_entry *entry;
395
396 while (begin != end) {
397 int middle = begin + (end - begin) / 2;
398 entry = applesmc_get_entry_by_index(middle);
399 if (IS_ERR(entry)) {
400 *hi = smcreg.key_count;
401 return PTR_ERR(entry);
402 }
403 if (strcmp(key, entry->key) < 0)
404 end = middle;
405 else
406 begin = middle + 1;
407 }
408
409 *hi = begin;
410 return 0;
411}
412
413static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
414{
415 int begin, end;
416 int ret;
417
418 ret = applesmc_get_lower_bound(&begin, key);
419 if (ret)
420 return ERR_PTR(ret);
421 ret = applesmc_get_upper_bound(&end, key);
422 if (ret)
423 return ERR_PTR(ret);
424 if (end - begin != 1)
425 return ERR_PTR(-EINVAL);
426
427 return applesmc_get_entry_by_index(begin);
428}
429
430static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
431{
432 const struct applesmc_entry *entry;
433
434 entry = applesmc_get_entry_by_key(key);
435 if (IS_ERR(entry))
436 return PTR_ERR(entry);
437
438 return applesmc_read_entry(entry, buffer, len);
439}
440
441static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
442{
443 const struct applesmc_entry *entry;
444
445 entry = applesmc_get_entry_by_key(key);
446 if (IS_ERR(entry))
447 return PTR_ERR(entry);
448
449 return applesmc_write_entry(entry, buffer, len);
450}
451
452static int applesmc_has_key(const char *key, bool *value)
453{
454 const struct applesmc_entry *entry;
455
456 entry = applesmc_get_entry_by_key(key);
457 if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
458 return PTR_ERR(entry);
459
460 *value = !IS_ERR(entry);
461 return 0;
462}
463
464/*
465 * applesmc_read_s16 - Read 16-bit signed big endian register
466 */
467static int applesmc_read_s16(const char *key, s16 *value)
468{
469 u8 buffer[2];
470 int ret;
471
472 ret = applesmc_read_key(key, buffer, 2);
473 if (ret)
474 return ret;
475
476 *value = ((s16)buffer[0] << 8) | buffer[1];
477 return 0;
478}
479
480/*
481 * applesmc_device_init - initialize the accelerometer. Can sleep.
482 */
483static void applesmc_device_init(void)
484{
485 int total;
486 u8 buffer[2];
487
488 if (!smcreg.has_accelerometer)
489 return;
490
491 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
492 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
493 (buffer[0] != 0x00 || buffer[1] != 0x00))
494 return;
495 buffer[0] = 0xe0;
496 buffer[1] = 0x00;
497 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
498 msleep(INIT_WAIT_MSECS);
499 }
500
501 pr_warn("failed to init the device\n");
502}
503
504static int applesmc_init_index(struct applesmc_registers *s)
505{
506 const struct applesmc_entry *entry;
507 unsigned int i;
508
509 if (s->index)
510 return 0;
511
512 s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
513 if (!s->index)
514 return -ENOMEM;
515
516 for (i = s->temp_begin; i < s->temp_end; i++) {
517 entry = applesmc_get_entry_by_index(i);
518 if (IS_ERR(entry))
519 continue;
520 if (strcmp(entry->type, TEMP_SENSOR_TYPE))
521 continue;
522 s->index[s->index_count++] = entry->key;
523 }
524
525 return 0;
526}
527
528/*
529 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
530 */
531static int applesmc_init_smcreg_try(void)
532{
533 struct applesmc_registers *s = &smcreg;
534 bool left_light_sensor = 0, right_light_sensor = 0;
535 unsigned int count;
536 u8 tmp[1];
537 int ret;
538
539 if (s->init_complete)
540 return 0;
541
542 ret = read_register_count(&count);
543 if (ret)
544 return ret;
545
546 if (s->cache && s->key_count != count) {
547 pr_warn("key count changed from %d to %d\n",
548 s->key_count, count);
549 kfree(s->cache);
550 s->cache = NULL;
551 }
552 s->key_count = count;
553
554 if (!s->cache)
555 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
556 if (!s->cache)
557 return -ENOMEM;
558
559 ret = applesmc_read_key(FANS_COUNT, tmp, 1);
560 if (ret)
561 return ret;
562 s->fan_count = tmp[0];
563 if (s->fan_count > 10)
564 s->fan_count = 10;
565
566 ret = applesmc_get_lower_bound(&s->temp_begin, "T");
567 if (ret)
568 return ret;
569 ret = applesmc_get_lower_bound(&s->temp_end, "U");
570 if (ret)
571 return ret;
572 s->temp_count = s->temp_end - s->temp_begin;
573
574 ret = applesmc_init_index(s);
575 if (ret)
576 return ret;
577
578 ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
579 if (ret)
580 return ret;
581 ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
582 if (ret)
583 return ret;
584 ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
585 if (ret)
586 return ret;
587 ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
588 if (ret)
589 return ret;
590
591 s->num_light_sensors = left_light_sensor + right_light_sensor;
592 s->init_complete = true;
593
594 pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
595 s->key_count, s->fan_count, s->temp_count, s->index_count,
596 s->has_accelerometer,
597 s->num_light_sensors,
598 s->has_key_backlight);
599
600 return 0;
601}
602
603static void applesmc_destroy_smcreg(void)
604{
605 kfree(smcreg.index);
606 smcreg.index = NULL;
607 kfree(smcreg.cache);
608 smcreg.cache = NULL;
609 smcreg.init_complete = false;
610}
611
612/*
613 * applesmc_init_smcreg - Initialize register cache.
614 *
615 * Retries until initialization is successful, or the operation times out.
616 *
617 */
618static int applesmc_init_smcreg(void)
619{
620 int ms, ret;
621
622 for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
623 ret = applesmc_init_smcreg_try();
624 if (!ret) {
625 if (ms)
626 pr_info("init_smcreg() took %d ms\n", ms);
627 return 0;
628 }
629 msleep(INIT_WAIT_MSECS);
630 }
631
632 applesmc_destroy_smcreg();
633
634 return ret;
635}
636
637/* Device model stuff */
638static int applesmc_probe(struct platform_device *dev)
639{
640 int ret;
641
642 ret = applesmc_init_smcreg();
643 if (ret)
644 return ret;
645
646 applesmc_device_init();
647
648 return 0;
649}
650
651/* Synchronize device with memorized backlight state */
652static int applesmc_pm_resume(struct device *dev)
653{
654 if (smcreg.has_key_backlight)
655 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
656 return 0;
657}
658
659/* Reinitialize device on resume from hibernation */
660static int applesmc_pm_restore(struct device *dev)
661{
662 applesmc_device_init();
663 return applesmc_pm_resume(dev);
664}
665
666static const struct dev_pm_ops applesmc_pm_ops = {
667 .resume = applesmc_pm_resume,
668 .restore = applesmc_pm_restore,
669};
670
671static struct platform_driver applesmc_driver = {
672 .probe = applesmc_probe,
673 .driver = {
674 .name = "applesmc",
675 .pm = &applesmc_pm_ops,
676 },
677};
678
679/*
680 * applesmc_calibrate - Set our "resting" values. Callers must
681 * hold applesmc_lock.
682 */
683static void applesmc_calibrate(void)
684{
685 applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
686 applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
687 rest_x = -rest_x;
688}
689
690static void applesmc_idev_poll(struct input_dev *idev)
691{
692 s16 x, y;
693
694 if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
695 return;
696 if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
697 return;
698
699 x = -x;
700 input_report_abs(idev, ABS_X, x - rest_x);
701 input_report_abs(idev, ABS_Y, y - rest_y);
702 input_sync(idev);
703}
704
705/* Sysfs Files */
706
707static ssize_t applesmc_name_show(struct device *dev,
708 struct device_attribute *attr, char *buf)
709{
710 return snprintf(buf, PAGE_SIZE, "applesmc\n");
711}
712
713static ssize_t applesmc_position_show(struct device *dev,
714 struct device_attribute *attr, char *buf)
715{
716 int ret;
717 s16 x, y, z;
718
719 ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
720 if (ret)
721 goto out;
722 ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
723 if (ret)
724 goto out;
725 ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
726 if (ret)
727 goto out;
728
729out:
730 if (ret)
731 return ret;
732 else
733 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
734}
735
736static ssize_t applesmc_light_show(struct device *dev,
737 struct device_attribute *attr, char *sysfsbuf)
738{
739 const struct applesmc_entry *entry;
740 static int data_length;
741 int ret;
742 u8 left = 0, right = 0;
743 u8 buffer[10];
744
745 if (!data_length) {
746 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
747 if (IS_ERR(entry))
748 return PTR_ERR(entry);
749 if (entry->len > 10)
750 return -ENXIO;
751 data_length = entry->len;
752 pr_info("light sensor data length set to %d\n", data_length);
753 }
754
755 ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
756 if (ret)
757 goto out;
758 /* newer macbooks report a single 10-bit bigendian value */
759 if (data_length == 10) {
760 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
761 goto out;
762 }
763 left = buffer[2];
764
765 ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
766 if (ret)
767 goto out;
768 right = buffer[2];
769
770out:
771 if (ret)
772 return ret;
773 else
774 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
775}
776
777/* Displays sensor key as label */
778static ssize_t applesmc_show_sensor_label(struct device *dev,
779 struct device_attribute *devattr, char *sysfsbuf)
780{
781 const char *key = smcreg.index[to_index(devattr)];
782
783 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
784}
785
786/* Displays degree Celsius * 1000 */
787static ssize_t applesmc_show_temperature(struct device *dev,
788 struct device_attribute *devattr, char *sysfsbuf)
789{
790 const char *key = smcreg.index[to_index(devattr)];
791 int ret;
792 s16 value;
793 int temp;
794
795 ret = applesmc_read_s16(key, &value);
796 if (ret)
797 return ret;
798
799 temp = 250 * (value >> 6);
800
801 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
802}
803
804static ssize_t applesmc_show_fan_speed(struct device *dev,
805 struct device_attribute *attr, char *sysfsbuf)
806{
807 int ret;
808 unsigned int speed = 0;
809 char newkey[5];
810 u8 buffer[2];
811
812 scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
813 to_index(attr));
814
815 ret = applesmc_read_key(newkey, buffer, 2);
816 if (ret)
817 return ret;
818
819 speed = ((buffer[0] << 8 | buffer[1]) >> 2);
820 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
821}
822
823static ssize_t applesmc_store_fan_speed(struct device *dev,
824 struct device_attribute *attr,
825 const char *sysfsbuf, size_t count)
826{
827 int ret;
828 unsigned long speed;
829 char newkey[5];
830 u8 buffer[2];
831
832 if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
833 return -EINVAL; /* Bigger than a 14-bit value */
834
835 scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
836 to_index(attr));
837
838 buffer[0] = (speed >> 6) & 0xff;
839 buffer[1] = (speed << 2) & 0xff;
840 ret = applesmc_write_key(newkey, buffer, 2);
841
842 if (ret)
843 return ret;
844 else
845 return count;
846}
847
848static ssize_t applesmc_show_fan_manual(struct device *dev,
849 struct device_attribute *attr, char *sysfsbuf)
850{
851 int ret;
852 u16 manual = 0;
853 u8 buffer[2];
854
855 ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
856 if (ret)
857 return ret;
858
859 manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
860 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
861}
862
863static ssize_t applesmc_store_fan_manual(struct device *dev,
864 struct device_attribute *attr,
865 const char *sysfsbuf, size_t count)
866{
867 int ret;
868 u8 buffer[2];
869 unsigned long input;
870 u16 val;
871
872 if (kstrtoul(sysfsbuf, 10, &input) < 0)
873 return -EINVAL;
874
875 ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
876 if (ret)
877 goto out;
878
879 val = (buffer[0] << 8 | buffer[1]);
880
881 if (input)
882 val = val | (0x01 << to_index(attr));
883 else
884 val = val & ~(0x01 << to_index(attr));
885
886 buffer[0] = (val >> 8) & 0xFF;
887 buffer[1] = val & 0xFF;
888
889 ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
890
891out:
892 if (ret)
893 return ret;
894 else
895 return count;
896}
897
898static ssize_t applesmc_show_fan_position(struct device *dev,
899 struct device_attribute *attr, char *sysfsbuf)
900{
901 int ret;
902 char newkey[5];
903 u8 buffer[17];
904
905 scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, to_index(attr));
906
907 ret = applesmc_read_key(newkey, buffer, 16);
908 buffer[16] = 0;
909
910 if (ret)
911 return ret;
912 else
913 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
914}
915
916static ssize_t applesmc_calibrate_show(struct device *dev,
917 struct device_attribute *attr, char *sysfsbuf)
918{
919 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
920}
921
922static ssize_t applesmc_calibrate_store(struct device *dev,
923 struct device_attribute *attr, const char *sysfsbuf, size_t count)
924{
925 applesmc_calibrate();
926
927 return count;
928}
929
930static void applesmc_backlight_set(struct work_struct *work)
931{
932 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
933}
934static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
935
936static void applesmc_brightness_set(struct led_classdev *led_cdev,
937 enum led_brightness value)
938{
939 int ret;
940
941 backlight_state[0] = value;
942 ret = queue_work(applesmc_led_wq, &backlight_work);
943
944 if (debug && (!ret))
945 dev_dbg(led_cdev->dev, "work was already on the queue.\n");
946}
947
948static ssize_t applesmc_key_count_show(struct device *dev,
949 struct device_attribute *attr, char *sysfsbuf)
950{
951 int ret;
952 u8 buffer[4];
953 u32 count;
954
955 ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
956 if (ret)
957 return ret;
958
959 count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
960 ((u32)buffer[2]<<8) + buffer[3];
961 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
962}
963
964static ssize_t applesmc_key_at_index_read_show(struct device *dev,
965 struct device_attribute *attr, char *sysfsbuf)
966{
967 const struct applesmc_entry *entry;
968 int ret;
969
970 entry = applesmc_get_entry_by_index(key_at_index);
971 if (IS_ERR(entry))
972 return PTR_ERR(entry);
973 ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
974 if (ret)
975 return ret;
976
977 return entry->len;
978}
979
980static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
981 struct device_attribute *attr, char *sysfsbuf)
982{
983 const struct applesmc_entry *entry;
984
985 entry = applesmc_get_entry_by_index(key_at_index);
986 if (IS_ERR(entry))
987 return PTR_ERR(entry);
988
989 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
990}
991
992static ssize_t applesmc_key_at_index_type_show(struct device *dev,
993 struct device_attribute *attr, char *sysfsbuf)
994{
995 const struct applesmc_entry *entry;
996
997 entry = applesmc_get_entry_by_index(key_at_index);
998 if (IS_ERR(entry))
999 return PTR_ERR(entry);
1000
1001 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
1002}
1003
1004static ssize_t applesmc_key_at_index_name_show(struct device *dev,
1005 struct device_attribute *attr, char *sysfsbuf)
1006{
1007 const struct applesmc_entry *entry;
1008
1009 entry = applesmc_get_entry_by_index(key_at_index);
1010 if (IS_ERR(entry))
1011 return PTR_ERR(entry);
1012
1013 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
1014}
1015
1016static ssize_t applesmc_key_at_index_show(struct device *dev,
1017 struct device_attribute *attr, char *sysfsbuf)
1018{
1019 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
1020}
1021
1022static ssize_t applesmc_key_at_index_store(struct device *dev,
1023 struct device_attribute *attr, const char *sysfsbuf, size_t count)
1024{
1025 unsigned long newkey;
1026
1027 if (kstrtoul(sysfsbuf, 10, &newkey) < 0
1028 || newkey >= smcreg.key_count)
1029 return -EINVAL;
1030
1031 key_at_index = newkey;
1032 return count;
1033}
1034
1035static struct led_classdev applesmc_backlight = {
1036 .name = "smc::kbd_backlight",
1037 .default_trigger = "nand-disk",
1038 .brightness_set = applesmc_brightness_set,
1039};
1040
1041static struct applesmc_node_group info_group[] = {
1042 { "name", applesmc_name_show },
1043 { "key_count", applesmc_key_count_show },
1044 { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1045 { "key_at_index_name", applesmc_key_at_index_name_show },
1046 { "key_at_index_type", applesmc_key_at_index_type_show },
1047 { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1048 { "key_at_index_data", applesmc_key_at_index_read_show },
1049 { }
1050};
1051
1052static struct applesmc_node_group accelerometer_group[] = {
1053 { "position", applesmc_position_show },
1054 { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1055 { }
1056};
1057
1058static struct applesmc_node_group light_sensor_group[] = {
1059 { "light", applesmc_light_show },
1060 { }
1061};
1062
1063static struct applesmc_node_group fan_group[] = {
1064 { "fan%d_label", applesmc_show_fan_position },
1065 { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1066 { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1067 { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1068 { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1069 { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1070 { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1071 { }
1072};
1073
1074static struct applesmc_node_group temp_group[] = {
1075 { "temp%d_label", applesmc_show_sensor_label },
1076 { "temp%d_input", applesmc_show_temperature },
1077 { }
1078};
1079
1080/* Module stuff */
1081
1082/*
1083 * applesmc_destroy_nodes - remove files and free associated memory
1084 */
1085static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1086{
1087 struct applesmc_node_group *grp;
1088 struct applesmc_dev_attr *node;
1089
1090 for (grp = groups; grp->nodes; grp++) {
1091 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1092 sysfs_remove_file(&pdev->dev.kobj,
1093 &node->sda.dev_attr.attr);
1094 kfree(grp->nodes);
1095 grp->nodes = NULL;
1096 }
1097}
1098
1099/*
1100 * applesmc_create_nodes - create a two-dimensional group of sysfs files
1101 */
1102static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1103{
1104 struct applesmc_node_group *grp;
1105 struct applesmc_dev_attr *node;
1106 struct attribute *attr;
1107 int ret, i;
1108
1109 for (grp = groups; grp->format; grp++) {
1110 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1111 if (!grp->nodes) {
1112 ret = -ENOMEM;
1113 goto out;
1114 }
1115 for (i = 0; i < num; i++) {
1116 node = &grp->nodes[i];
1117 scnprintf(node->name, sizeof(node->name), grp->format,
1118 i + 1);
1119 node->sda.index = (grp->option << 16) | (i & 0xffff);
1120 node->sda.dev_attr.show = grp->show;
1121 node->sda.dev_attr.store = grp->store;
1122 attr = &node->sda.dev_attr.attr;
1123 sysfs_attr_init(attr);
1124 attr->name = node->name;
1125 attr->mode = 0444 | (grp->store ? 0200 : 0);
1126 ret = sysfs_create_file(&pdev->dev.kobj, attr);
1127 if (ret) {
1128 attr->name = NULL;
1129 goto out;
1130 }
1131 }
1132 }
1133
1134 return 0;
1135out:
1136 applesmc_destroy_nodes(groups);
1137 return ret;
1138}
1139
1140/* Create accelerometer resources */
1141static int applesmc_create_accelerometer(void)
1142{
1143 int ret;
1144
1145 if (!smcreg.has_accelerometer)
1146 return 0;
1147
1148 ret = applesmc_create_nodes(accelerometer_group, 1);
1149 if (ret)
1150 goto out;
1151
1152 applesmc_idev = input_allocate_device();
1153 if (!applesmc_idev) {
1154 ret = -ENOMEM;
1155 goto out_sysfs;
1156 }
1157
1158 /* initial calibrate for the input device */
1159 applesmc_calibrate();
1160
1161 /* initialize the input device */
1162 applesmc_idev->name = "applesmc";
1163 applesmc_idev->id.bustype = BUS_HOST;
1164 applesmc_idev->dev.parent = &pdev->dev;
1165 input_set_abs_params(applesmc_idev, ABS_X,
1166 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1167 input_set_abs_params(applesmc_idev, ABS_Y,
1168 -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1169
1170 ret = input_setup_polling(applesmc_idev, applesmc_idev_poll);
1171 if (ret)
1172 goto out_idev;
1173
1174 input_set_poll_interval(applesmc_idev, APPLESMC_POLL_INTERVAL);
1175
1176 ret = input_register_device(applesmc_idev);
1177 if (ret)
1178 goto out_idev;
1179
1180 return 0;
1181
1182out_idev:
1183 input_free_device(applesmc_idev);
1184
1185out_sysfs:
1186 applesmc_destroy_nodes(accelerometer_group);
1187
1188out:
1189 pr_warn("driver init failed (ret=%d)!\n", ret);
1190 return ret;
1191}
1192
1193/* Release all resources used by the accelerometer */
1194static void applesmc_release_accelerometer(void)
1195{
1196 if (!smcreg.has_accelerometer)
1197 return;
1198 input_unregister_device(applesmc_idev);
1199 applesmc_destroy_nodes(accelerometer_group);
1200}
1201
1202static int applesmc_create_light_sensor(void)
1203{
1204 if (!smcreg.num_light_sensors)
1205 return 0;
1206 return applesmc_create_nodes(light_sensor_group, 1);
1207}
1208
1209static void applesmc_release_light_sensor(void)
1210{
1211 if (!smcreg.num_light_sensors)
1212 return;
1213 applesmc_destroy_nodes(light_sensor_group);
1214}
1215
1216static int applesmc_create_key_backlight(void)
1217{
1218 if (!smcreg.has_key_backlight)
1219 return 0;
1220 applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1221 if (!applesmc_led_wq)
1222 return -ENOMEM;
1223 return led_classdev_register(&pdev->dev, &applesmc_backlight);
1224}
1225
1226static void applesmc_release_key_backlight(void)
1227{
1228 if (!smcreg.has_key_backlight)
1229 return;
1230 led_classdev_unregister(&applesmc_backlight);
1231 destroy_workqueue(applesmc_led_wq);
1232}
1233
1234static int applesmc_dmi_match(const struct dmi_system_id *id)
1235{
1236 return 1;
1237}
1238
1239/*
1240 * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1241 * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1242 */
1243static const struct dmi_system_id applesmc_whitelist[] __initconst = {
1244 { applesmc_dmi_match, "Apple MacBook Air", {
1245 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1246 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1247 },
1248 { applesmc_dmi_match, "Apple MacBook Pro", {
1249 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1250 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1251 },
1252 { applesmc_dmi_match, "Apple MacBook", {
1253 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1254 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1255 },
1256 { applesmc_dmi_match, "Apple Macmini", {
1257 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1258 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1259 },
1260 { applesmc_dmi_match, "Apple MacPro", {
1261 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1262 DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1263 },
1264 { applesmc_dmi_match, "Apple iMac", {
1265 DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1266 DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1267 },
1268 { .ident = NULL }
1269};
1270
1271static int __init applesmc_init(void)
1272{
1273 int ret;
1274
1275 if (!dmi_check_system(applesmc_whitelist)) {
1276 pr_warn("supported laptop not found!\n");
1277 ret = -ENODEV;
1278 goto out;
1279 }
1280
1281 if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1282 "applesmc")) {
1283 ret = -ENXIO;
1284 goto out;
1285 }
1286
1287 ret = platform_driver_register(&applesmc_driver);
1288 if (ret)
1289 goto out_region;
1290
1291 pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1292 NULL, 0);
1293 if (IS_ERR(pdev)) {
1294 ret = PTR_ERR(pdev);
1295 goto out_driver;
1296 }
1297
1298 /* create register cache */
1299 ret = applesmc_init_smcreg();
1300 if (ret)
1301 goto out_device;
1302
1303 ret = applesmc_create_nodes(info_group, 1);
1304 if (ret)
1305 goto out_smcreg;
1306
1307 ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1308 if (ret)
1309 goto out_info;
1310
1311 ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1312 if (ret)
1313 goto out_fans;
1314
1315 ret = applesmc_create_accelerometer();
1316 if (ret)
1317 goto out_temperature;
1318
1319 ret = applesmc_create_light_sensor();
1320 if (ret)
1321 goto out_accelerometer;
1322
1323 ret = applesmc_create_key_backlight();
1324 if (ret)
1325 goto out_light_sysfs;
1326
1327 hwmon_dev = hwmon_device_register(&pdev->dev);
1328 if (IS_ERR(hwmon_dev)) {
1329 ret = PTR_ERR(hwmon_dev);
1330 goto out_light_ledclass;
1331 }
1332
1333 return 0;
1334
1335out_light_ledclass:
1336 applesmc_release_key_backlight();
1337out_light_sysfs:
1338 applesmc_release_light_sensor();
1339out_accelerometer:
1340 applesmc_release_accelerometer();
1341out_temperature:
1342 applesmc_destroy_nodes(temp_group);
1343out_fans:
1344 applesmc_destroy_nodes(fan_group);
1345out_info:
1346 applesmc_destroy_nodes(info_group);
1347out_smcreg:
1348 applesmc_destroy_smcreg();
1349out_device:
1350 platform_device_unregister(pdev);
1351out_driver:
1352 platform_driver_unregister(&applesmc_driver);
1353out_region:
1354 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1355out:
1356 pr_warn("driver init failed (ret=%d)!\n", ret);
1357 return ret;
1358}
1359
1360static void __exit applesmc_exit(void)
1361{
1362 hwmon_device_unregister(hwmon_dev);
1363 applesmc_release_key_backlight();
1364 applesmc_release_light_sensor();
1365 applesmc_release_accelerometer();
1366 applesmc_destroy_nodes(temp_group);
1367 applesmc_destroy_nodes(fan_group);
1368 applesmc_destroy_nodes(info_group);
1369 applesmc_destroy_smcreg();
1370 platform_device_unregister(pdev);
1371 platform_driver_unregister(&applesmc_driver);
1372 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1373}
1374
1375module_init(applesmc_init);
1376module_exit(applesmc_exit);
1377
1378MODULE_AUTHOR("Nicolas Boichat");
1379MODULE_DESCRIPTION("Apple SMC");
1380MODULE_LICENSE("GPL v2");
1381MODULE_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#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, 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
607static 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 */
622static 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 */
642static 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 */
656static 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 */
664static int applesmc_pm_restore(struct device *dev)
665{
666 applesmc_device_init();
667 return applesmc_pm_resume(dev);
668}
669
670static const struct dev_pm_ops applesmc_pm_ops = {
671 .resume = applesmc_pm_resume,
672 .restore = applesmc_pm_restore,
673};
674
675static 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 */
688static 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
695static 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
713static 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
719static 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
735out:
736 if (ret)
737 return ret;
738 else
739 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
740}
741
742static 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
773out:
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 */
781static 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 */
790static 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
807static 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
826static 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
850static 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
866static 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
893out:
894 if (ret)
895 return ret;
896 else
897 return count;
898}
899
900static 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
918static 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
924static 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
932static void applesmc_backlight_set(struct work_struct *work)
933{
934 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
935}
936static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
937
938static 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
950static 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
967static 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
983static 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
995static 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
1007static 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
1019static 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
1025static 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
1038static struct led_classdev applesmc_backlight = {
1039 .name = "smc::kbd_backlight",
1040 .default_trigger = "nand-disk",
1041 .brightness_set = applesmc_brightness_set,
1042};
1043
1044static 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
1055static struct applesmc_node_group accelerometer_group[] = {
1056 { "position", applesmc_position_show },
1057 { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1058 { }
1059};
1060
1061static struct applesmc_node_group light_sensor_group[] = {
1062 { "light", applesmc_light_show },
1063 { }
1064};
1065
1066static 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
1077static 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 */
1088static 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 */
1105static 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;
1137out:
1138 applesmc_destroy_nodes(groups);
1139 return ret;
1140}
1141
1142/* Create accelerometer ressources */
1143static 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
1184out_idev:
1185 input_free_polled_device(applesmc_idev);
1186
1187out_sysfs:
1188 applesmc_destroy_nodes(accelerometer_group);
1189
1190out:
1191 pr_warn("driver init failed (ret=%d)!\n", ret);
1192 return ret;
1193}
1194
1195/* Release all ressources used by the accelerometer */
1196static 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
1205static 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
1212static void applesmc_release_light_sensor(void)
1213{
1214 if (!smcreg.num_light_sensors)
1215 return;
1216 applesmc_destroy_nodes(light_sensor_group);
1217}
1218
1219static 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
1229static 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
1237static 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 */
1246static __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
1274static 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
1338out_light_ledclass:
1339 applesmc_release_key_backlight();
1340out_light_sysfs:
1341 applesmc_release_light_sensor();
1342out_accelerometer:
1343 applesmc_release_accelerometer();
1344out_temperature:
1345 applesmc_destroy_nodes(temp_group);
1346out_fans:
1347 applesmc_destroy_nodes(fan_group);
1348out_info:
1349 applesmc_destroy_nodes(info_group);
1350out_smcreg:
1351 applesmc_destroy_smcreg();
1352out_device:
1353 platform_device_unregister(pdev);
1354out_driver:
1355 platform_driver_unregister(&applesmc_driver);
1356out_region:
1357 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1358out:
1359 pr_warn("driver init failed (ret=%d)!\n", ret);
1360 return ret;
1361}
1362
1363static 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
1378module_init(applesmc_init);
1379module_exit(applesmc_exit);
1380
1381MODULE_AUTHOR("Nicolas Boichat");
1382MODULE_DESCRIPTION("Apple SMC");
1383MODULE_LICENSE("GPL v2");
1384MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);