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iio: ep93xx: remove redundant return value check of platform_get_resource()
[linux-2.6/btrfs-unstable.git] / drivers / hwmon / applesmc.c
blob5c677ba44014307c7651928641393da6e90f5eae
1 /*
2 * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
3 * sensors, fan control, keyboard backlight control) used in Intel-based Apple
4 * computers.
5 *
6 * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
7 * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
8 *
9 * Based on hdaps.c driver:
10 * Copyright (C) 2005 Robert Love <rml@novell.com>
11 * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
12 *
13 * Fan control based on smcFanControl:
14 * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
15 *
16 * This program is free software; you can redistribute it and/or modify it
17 * under the terms of the GNU General Public License v2 as published by the
18 * Free Software Foundation.
19 *
20 * This program is distributed in the hope that it will be useful, but WITHOUT
21 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
22 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
23 * more details.
24 *
25 * You should have received a copy of the GNU General Public License along with
26 * this program; if not, write to the Free Software Foundation, Inc.,
27 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
28 */
29
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #include <linux/delay.h>
33 #include <linux/platform_device.h>
34 #include <linux/input-polldev.h>
35 #include <linux/kernel.h>
36 #include <linux/slab.h>
37 #include <linux/module.h>
38 #include <linux/timer.h>
39 #include <linux/dmi.h>
40 #include <linux/mutex.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/io.h>
43 #include <linux/leds.h>
44 #include <linux/hwmon.h>
45 #include <linux/workqueue.h>
46 #include <linux/err.h>
47
48 /* data port used by Apple SMC */
49 #define APPLESMC_DATA_PORT 0x300
50 /* command/status port used by Apple SMC */
51 #define APPLESMC_CMD_PORT 0x304
52
53 #define APPLESMC_NR_PORTS 32 /* 0x300-0x31f */
54
55 #define APPLESMC_MAX_DATA_LENGTH 32
56
57 /* wait up to 128 ms for a status change. */
58 #define APPLESMC_MIN_WAIT 0x0010
59 #define APPLESMC_RETRY_WAIT 0x0100
60 #define APPLESMC_MAX_WAIT 0x20000
61
62 #define APPLESMC_READ_CMD 0x10
63 #define APPLESMC_WRITE_CMD 0x11
64 #define APPLESMC_GET_KEY_BY_INDEX_CMD 0x12
65 #define APPLESMC_GET_KEY_TYPE_CMD 0x13
66
67 #define KEY_COUNT_KEY "#KEY" /* r-o ui32 */
68
69 #define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6-10 bytes) */
70 #define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6-10 bytes) */
71 #define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */
72
73 #define CLAMSHELL_KEY "MSLD" /* r-o ui8 (unused) */
74
75 #define MOTION_SENSOR_X_KEY "MO_X" /* r-o sp78 (2 bytes) */
76 #define MOTION_SENSOR_Y_KEY "MO_Y" /* r-o sp78 (2 bytes) */
77 #define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */
78 #define MOTION_SENSOR_KEY "MOCN" /* r/w ui16 */
79
80 #define FANS_COUNT "FNum" /* r-o ui8 */
81 #define FANS_MANUAL "FS! " /* r-w ui16 */
82 #define FAN_ID_FMT "F%dID" /* r-o char[16] */
83
84 #define TEMP_SENSOR_TYPE "sp78"
85
86 /* List of keys used to read/write fan speeds */
87 static const char *const fan_speed_fmt[] = {
88 "F%dAc", /* actual speed */
89 "F%dMn", /* minimum speed (rw) */
90 "F%dMx", /* maximum speed */
91 "F%dSf", /* safe speed - not all models */
92 "F%dTg", /* target speed (manual: rw) */
93 };
94
95 #define INIT_TIMEOUT_MSECS 5000 /* wait up to 5s for device init ... */
96 #define INIT_WAIT_MSECS 50 /* ... in 50ms increments */
97
98 #define APPLESMC_POLL_INTERVAL 50 /* msecs */
99 #define APPLESMC_INPUT_FUZZ 4 /* input event threshold */
100 #define APPLESMC_INPUT_FLAT 4
101
102 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
103 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
104
105 /* Dynamic device node attributes */
106 struct applesmc_dev_attr {
107 struct sensor_device_attribute sda; /* hwmon attributes */
108 char name[32]; /* room for node file name */
109 };
110
111 /* Dynamic device node group */
112 struct applesmc_node_group {
113 char *format; /* format string */
114 void *show; /* show function */
115 void *store; /* store function */
116 int option; /* function argument */
117 struct applesmc_dev_attr *nodes; /* dynamic node array */
118 };
119
120 /* AppleSMC entry - cached register information */
121 struct applesmc_entry {
122 char key[5]; /* four-letter key code */
123 u8 valid; /* set when entry is successfully read once */
124 u8 len; /* bounded by APPLESMC_MAX_DATA_LENGTH */
125 char type[5]; /* four-letter type code */
126 u8 flags; /* 0x10: func; 0x40: write; 0x80: read */
127 };
128
129 /* Register lookup and registers common to all SMCs */
130 static struct applesmc_registers {
131 struct mutex mutex; /* register read/write mutex */
132 unsigned int key_count; /* number of SMC registers */
133 unsigned int fan_count; /* number of fans */
134 unsigned int temp_count; /* number of temperature registers */
135 unsigned int temp_begin; /* temperature lower index bound */
136 unsigned int temp_end; /* temperature upper index bound */
137 unsigned int index_count; /* size of temperature index array */
138 int num_light_sensors; /* number of light sensors */
139 bool has_accelerometer; /* has motion sensor */
140 bool has_key_backlight; /* has keyboard backlight */
141 bool init_complete; /* true when fully initialized */
142 struct applesmc_entry *cache; /* cached key entries */
143 const char **index; /* temperature key index */
144 } smcreg = {
145 .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
146 };
147
148 static const int debug;
149 static struct platform_device *pdev;
150 static s16 rest_x;
151 static s16 rest_y;
152 static u8 backlight_state[2];
153
154 static struct device *hwmon_dev;
155 static struct input_polled_dev *applesmc_idev;
156
157 /*
158 * Last index written to key_at_index sysfs file, and value to use for all other
159 * key_at_index_* sysfs files.
160 */
161 static unsigned int key_at_index;
162
163 static struct workqueue_struct *applesmc_led_wq;
164
165 /*
166 * wait_read - Wait for a byte to appear on SMC port. Callers must
167 * hold applesmc_lock.
168 */
169 static int wait_read(void)
170 {
171 u8 status;
172 int us;
173 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
174 udelay(us);
175 status = inb(APPLESMC_CMD_PORT);
176 /* read: wait for smc to settle */
177 if (status & 0x01)
178 return 0;
179 }
180
181 pr_warn("wait_read() fail: 0x%02x\n", status);
182 return -EIO;
183 }
184
185 /*
186 * send_byte - Write to SMC port, retrying when necessary. Callers
187 * must hold applesmc_lock.
188 */
189 static int send_byte(u8 cmd, u16 port)
190 {
191 u8 status;
192 int us;
193
194 outb(cmd, port);
195 for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
196 udelay(us);
197 status = inb(APPLESMC_CMD_PORT);
198 /* write: wait for smc to settle */
199 if (status & 0x02)
200 continue;
201 /* ready: cmd accepted, return */
202 if (status & 0x04)
203 return 0;
204 /* timeout: give up */
205 if (us << 1 == APPLESMC_MAX_WAIT)
206 break;
207 /* busy: long wait and resend */
208 udelay(APPLESMC_RETRY_WAIT);
209 outb(cmd, port);
210 }
211
212 pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status);
213 return -EIO;
214 }
215
216 static int send_command(u8 cmd)
217 {
218 return send_byte(cmd, APPLESMC_CMD_PORT);
219 }
220
221 static int send_argument(const char *key)
222 {
223 int i;
224
225 for (i = 0; i < 4; i++)
226 if (send_byte(key[i], APPLESMC_DATA_PORT))
227 return -EIO;
228 return 0;
229 }
230
231 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
232 {
233 u8 status, data = 0;
234 int i;
235
236 if (send_command(cmd) || send_argument(key)) {
237 pr_warn("%.4s: read arg fail\n", key);
238 return -EIO;
239 }
240
241 /* This has no effect on newer (2012) SMCs */
242 if (send_byte(len, APPLESMC_DATA_PORT)) {
243 pr_warn("%.4s: read len fail\n", key);
244 return -EIO;
245 }
246
247 for (i = 0; i < len; i++) {
248 if (wait_read()) {
249 pr_warn("%.4s: read data[%d] fail\n", key, i);
250 return -EIO;
251 }
252 buffer[i] = inb(APPLESMC_DATA_PORT);
253 }
254
255 /* Read the data port until bit0 is cleared */
256 for (i = 0; i < 16; i++) {
257 udelay(APPLESMC_MIN_WAIT);
258 status = inb(APPLESMC_CMD_PORT);
259 if (!(status & 0x01))
260 break;
261 data = inb(APPLESMC_DATA_PORT);
262 }
263 if (i)
264 pr_warn("flushed %d bytes, last value is: %d\n", i, data);
265
266 return 0;
267 }
268
269 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
270 {
271 int i;
272
273 if (send_command(cmd) || send_argument(key)) {
274 pr_warn("%s: write arg fail\n", key);
275 return -EIO;
276 }
277
278 if (send_byte(len, APPLESMC_DATA_PORT)) {
279 pr_warn("%.4s: write len fail\n", key);
280 return -EIO;
281 }
282
283 for (i = 0; i < len; i++) {
284 if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
285 pr_warn("%s: write data fail\n", key);
286 return -EIO;
287 }
288 }
289
290 return 0;
291 }
292
293 static int read_register_count(unsigned int *count)
294 {
295 __be32 be;
296 int ret;
297
298 ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
299 if (ret)
300 return ret;
301
302 *count = be32_to_cpu(be);
303 return 0;
304 }
305
306 /*
307 * Serialized I/O
308 *
309 * Returns zero on success or a negative error on failure.
310 * All functions below are concurrency safe - callers should NOT hold lock.
311 */
312
313 static int applesmc_read_entry(const struct applesmc_entry *entry,
314 u8 *buf, u8 len)
315 {
316 int ret;
317
318 if (entry->len != len)
319 return -EINVAL;
320 mutex_lock(&smcreg.mutex);
321 ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
322 mutex_unlock(&smcreg.mutex);
323
324 return ret;
325 }
326
327 static int applesmc_write_entry(const struct applesmc_entry *entry,
328 const u8 *buf, u8 len)
329 {
330 int ret;
331
332 if (entry->len != len)
333 return -EINVAL;
334 mutex_lock(&smcreg.mutex);
335 ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
336 mutex_unlock(&smcreg.mutex);
337 return ret;
338 }
339
340 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
341 {
342 struct applesmc_entry *cache = &smcreg.cache[index];
343 u8 key[4], info[6];
344 __be32 be;
345 int ret = 0;
346
347 if (cache->valid)
348 return cache;
349
350 mutex_lock(&smcreg.mutex);
351
352 if (cache->valid)
353 goto out;
354 be = cpu_to_be32(index);
355 ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
356 if (ret)
357 goto out;
358 ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
359 if (ret)
360 goto out;
361
362 memcpy(cache->key, key, 4);
363 cache->len = info[0];
364 memcpy(cache->type, &info[1], 4);
365 cache->flags = info[5];
366 cache->valid = 1;
367
368 out:
369 mutex_unlock(&smcreg.mutex);
370 if (ret)
371 return ERR_PTR(ret);
372 return cache;
373 }
374
375 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
376 {
377 int begin = 0, end = smcreg.key_count;
378 const struct applesmc_entry *entry;
379
380 while (begin != end) {
381 int middle = begin + (end - begin) / 2;
382 entry = applesmc_get_entry_by_index(middle);
383 if (IS_ERR(entry)) {
384 *lo = 0;
385 return PTR_ERR(entry);
386 }
387 if (strcmp(entry->key, key) < 0)
388 begin = middle + 1;
389 else
390 end = middle;
391 }
392
393 *lo = begin;
394 return 0;
395 }
396
397 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
398 {
399 int begin = 0, end = smcreg.key_count;
400 const struct applesmc_entry *entry;
401
402 while (begin != end) {
403 int middle = begin + (end - begin) / 2;
404 entry = applesmc_get_entry_by_index(middle);
405 if (IS_ERR(entry)) {
406 *hi = smcreg.key_count;
407 return PTR_ERR(entry);
408 }
409 if (strcmp(key, entry->key) < 0)
410 end = middle;
411 else
412 begin = middle + 1;
413 }
414
415 *hi = begin;
416 return 0;
417 }
418
419 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
420 {
421 int begin, end;
422 int ret;
423
424 ret = applesmc_get_lower_bound(&begin, key);
425 if (ret)
426 return ERR_PTR(ret);
427 ret = applesmc_get_upper_bound(&end, key);
428 if (ret)
429 return ERR_PTR(ret);
430 if (end - begin != 1)
431 return ERR_PTR(-EINVAL);
432
433 return applesmc_get_entry_by_index(begin);
434 }
435
436 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
437 {
438 const struct applesmc_entry *entry;
439
440 entry = applesmc_get_entry_by_key(key);
441 if (IS_ERR(entry))
442 return PTR_ERR(entry);
443
444 return applesmc_read_entry(entry, buffer, len);
445 }
446
447 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
448 {
449 const struct applesmc_entry *entry;
450
451 entry = applesmc_get_entry_by_key(key);
452 if (IS_ERR(entry))
453 return PTR_ERR(entry);
454
455 return applesmc_write_entry(entry, buffer, len);
456 }
457
458 static int applesmc_has_key(const char *key, bool *value)
459 {
460 const struct applesmc_entry *entry;
461
462 entry = applesmc_get_entry_by_key(key);
463 if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
464 return PTR_ERR(entry);
465
466 *value = !IS_ERR(entry);
467 return 0;
468 }
469
470 /*
471 * applesmc_read_s16 - Read 16-bit signed big endian register
472 */
473 static int applesmc_read_s16(const char *key, s16 *value)
474 {
475 u8 buffer[2];
476 int ret;
477
478 ret = applesmc_read_key(key, buffer, 2);
479 if (ret)
480 return ret;
481
482 *value = ((s16)buffer[0] << 8) | buffer[1];
483 return 0;
484 }
485
486 /*
487 * applesmc_device_init - initialize the accelerometer. Can sleep.
488 */
489 static void applesmc_device_init(void)
490 {
491 int total;
492 u8 buffer[2];
493
494 if (!smcreg.has_accelerometer)
495 return;
496
497 for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
498 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
499 (buffer[0] != 0x00 || buffer[1] != 0x00))
500 return;
501 buffer[0] = 0xe0;
502 buffer[1] = 0x00;
503 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
504 msleep(INIT_WAIT_MSECS);
505 }
506
507 pr_warn("failed to init the device\n");
508 }
509
510 static int applesmc_init_index(struct applesmc_registers *s)
511 {
512 const struct applesmc_entry *entry;
513 unsigned int i;
514
515 if (s->index)
516 return 0;
517
518 s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
519 if (!s->index)
520 return -ENOMEM;
521
522 for (i = s->temp_begin; i < s->temp_end; i++) {
523 entry = applesmc_get_entry_by_index(i);
524 if (IS_ERR(entry))
525 continue;
526 if (strcmp(entry->type, TEMP_SENSOR_TYPE))
527 continue;
528 s->index[s->index_count++] = entry->key;
529 }
530
531 return 0;
532 }
533
534 /*
535 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
536 */
537 static 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
609 static 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 */
624 static 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 */
644 static 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 */
658 static 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 */
666 static int applesmc_pm_restore(struct device *dev)
667 {
668 applesmc_device_init();
669 return applesmc_pm_resume(dev);
670 }
671
672 static const struct dev_pm_ops applesmc_pm_ops = {
673 .resume = applesmc_pm_resume,
674 .restore = applesmc_pm_restore,
675 };
676
677 static 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 */
689 static 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
696 static 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
714 static 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
720 static 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
736 out:
737 if (ret)
738 return ret;
739 else
740 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
741 }
742
743 static 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
774 out:
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 */
782 static 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 */
791 static 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
808 static 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
828 static 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
853 static 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
869 static 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
896 out:
897 if (ret)
898 return ret;
899 else
900 return count;
901 }
902
903 static 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
921 static 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
927 static 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
935 static void applesmc_backlight_set(struct work_struct *work)
936 {
937 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
938 }
939 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
940
941 static 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
953 static 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
970 static 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
986 static 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
998 static 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
1010 static 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
1022 static 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
1028 static 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
1041 static struct led_classdev applesmc_backlight = {
1042 .name = "smc::kbd_backlight",
1043 .default_trigger = "nand-disk",
1044 .brightness_set = applesmc_brightness_set,
1045 };
1046
1047 static 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
1058 static struct applesmc_node_group accelerometer_group[] = {
1059 { "position", applesmc_position_show },
1060 { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1061 { }
1062 };
1063
1064 static struct applesmc_node_group light_sensor_group[] = {
1065 { "light", applesmc_light_show },
1066 { }
1067 };
1068
1069 static 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
1080 static 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 */
1091 static 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 */
1108 static 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;
1141 out:
1142 applesmc_destroy_nodes(groups);
1143 return ret;
1144 }
1145
1146 /* Create accelerometer resources */
1147 static 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
1188 out_idev:
1189 input_free_polled_device(applesmc_idev);
1190
1191 out_sysfs:
1192 applesmc_destroy_nodes(accelerometer_group);
1193
1194 out:
1195 pr_warn("driver init failed (ret=%d)!\n", ret);
1196 return ret;
1197 }
1198
1199 /* Release all resources used by the accelerometer */
1200 static 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
1209 static 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
1216 static void applesmc_release_light_sensor(void)
1217 {
1218 if (!smcreg.num_light_sensors)
1219 return;
1220 applesmc_destroy_nodes(light_sensor_group);
1221 }
1222
1223 static 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
1233 static 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
1241 static 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 */
1250 static 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
1278 static 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
1342 out_light_ledclass:
1343 applesmc_release_key_backlight();
1344 out_light_sysfs:
1345 applesmc_release_light_sensor();
1346 out_accelerometer:
1347 applesmc_release_accelerometer();
1348 out_temperature:
1349 applesmc_destroy_nodes(temp_group);
1350 out_fans:
1351 applesmc_destroy_nodes(fan_group);
1352 out_info:
1353 applesmc_destroy_nodes(info_group);
1354 out_smcreg:
1355 applesmc_destroy_smcreg();
1356 out_device:
1357 platform_device_unregister(pdev);
1358 out_driver:
1359 platform_driver_unregister(&applesmc_driver);
1360 out_region:
1361 release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1362 out:
1363 pr_warn("driver init failed (ret=%d)!\n", ret);
1364 return ret;
1365 }
1366
1367 static 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
1382 module_init(applesmc_init);
1383 module_exit(applesmc_exit);
1384
1385 MODULE_AUTHOR("Nicolas Boichat");
1386 MODULE_DESCRIPTION("Apple SMC");
1387 MODULE_LICENSE("GPL v2");
1388 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);
(deprecated) Btrfs devel tree