Merge tag 'tty-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / hwmon / applesmc.c
1 /*
2  * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
3  * sensors, fan control, keyboard backlight control) used in Intel-based Apple
4  * computers.
5  *
6  * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
7  * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
8  *
9  * Based on hdaps.c driver:
10  * Copyright (C) 2005 Robert Love <rml@novell.com>
11  * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
12  *
13  * Fan control based on smcFanControl:
14  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
15  *
16  * This program is free software; you can redistribute it and/or modify it
17  * under the terms of the GNU General Public License v2 as published by the
18  * Free Software Foundation.
19  *
20  * This program is distributed in the hope that it will be useful, but WITHOUT
21  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
22  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
23  * more details.
24  *
25  * You should have received a copy of the GNU General Public License along with
26  * this program; if not, write to the Free Software Foundation, Inc.,
27  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
28  */
29
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #include <linux/delay.h>
33 #include <linux/platform_device.h>
34 #include <linux/input-polldev.h>
35 #include <linux/kernel.h>
36 #include <linux/slab.h>
37 #include <linux/module.h>
38 #include <linux/timer.h>
39 #include <linux/dmi.h>
40 #include <linux/mutex.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/io.h>
43 #include <linux/leds.h>
44 #include <linux/hwmon.h>
45 #include <linux/workqueue.h>
46
47 /* data port used by Apple SMC */
48 #define APPLESMC_DATA_PORT      0x300
49 /* command/status port used by Apple SMC */
50 #define APPLESMC_CMD_PORT       0x304
51
52 #define APPLESMC_NR_PORTS       32 /* 0x300-0x31f */
53
54 #define APPLESMC_MAX_DATA_LENGTH 32
55
56 /* wait up to 32 ms for a status change. */
57 #define APPLESMC_MIN_WAIT       0x0010
58 #define APPLESMC_MAX_WAIT       0x8000
59
60 #define APPLESMC_STATUS_MASK    0x0f
61 #define APPLESMC_READ_CMD       0x10
62 #define APPLESMC_WRITE_CMD      0x11
63 #define APPLESMC_GET_KEY_BY_INDEX_CMD   0x12
64 #define APPLESMC_GET_KEY_TYPE_CMD       0x13
65
66 #define KEY_COUNT_KEY           "#KEY" /* r-o ui32 */
67
68 #define LIGHT_SENSOR_LEFT_KEY   "ALV0" /* r-o {alv (6-10 bytes) */
69 #define LIGHT_SENSOR_RIGHT_KEY  "ALV1" /* r-o {alv (6-10 bytes) */
70 #define BACKLIGHT_KEY           "LKSB" /* w-o {lkb (2 bytes) */
71
72 #define CLAMSHELL_KEY           "MSLD" /* r-o ui8 (unused) */
73
74 #define MOTION_SENSOR_X_KEY     "MO_X" /* r-o sp78 (2 bytes) */
75 #define MOTION_SENSOR_Y_KEY     "MO_Y" /* r-o sp78 (2 bytes) */
76 #define MOTION_SENSOR_Z_KEY     "MO_Z" /* r-o sp78 (2 bytes) */
77 #define MOTION_SENSOR_KEY       "MOCN" /* r/w ui16 */
78
79 #define FANS_COUNT              "FNum" /* r-o ui8 */
80 #define FANS_MANUAL             "FS! " /* r-w ui16 */
81 #define FAN_ID_FMT              "F%dID" /* r-o char[16] */
82
83 #define TEMP_SENSOR_TYPE        "sp78"
84
85 /* List of keys used to read/write fan speeds */
86 static const char *const fan_speed_fmt[] = {
87         "F%dAc",                /* actual speed */
88         "F%dMn",                /* minimum speed (rw) */
89         "F%dMx",                /* maximum speed */
90         "F%dSf",                /* safe speed - not all models */
91         "F%dTg",                /* target speed (manual: rw) */
92 };
93
94 #define INIT_TIMEOUT_MSECS      5000    /* wait up to 5s for device init ... */
95 #define INIT_WAIT_MSECS         50      /* ... in 50ms increments */
96
97 #define APPLESMC_POLL_INTERVAL  50      /* msecs */
98 #define APPLESMC_INPUT_FUZZ     4       /* input event threshold */
99 #define APPLESMC_INPUT_FLAT     4
100
101 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
102 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
103
104 /* Dynamic device node attributes */
105 struct applesmc_dev_attr {
106         struct sensor_device_attribute sda;     /* hwmon attributes */
107         char name[32];                          /* room for node file name */
108 };
109
110 /* Dynamic device node group */
111 struct applesmc_node_group {
112         char *format;                           /* format string */
113         void *show;                             /* show function */
114         void *store;                            /* store function */
115         int option;                             /* function argument */
116         struct applesmc_dev_attr *nodes;        /* dynamic node array */
117 };
118
119 /* AppleSMC entry - cached register information */
120 struct applesmc_entry {
121         char key[5];            /* four-letter key code */
122         u8 valid;               /* set when entry is successfully read once */
123         u8 len;                 /* bounded by APPLESMC_MAX_DATA_LENGTH */
124         char type[5];           /* four-letter type code */
125         u8 flags;               /* 0x10: func; 0x40: write; 0x80: read */
126 };
127
128 /* Register lookup and registers common to all SMCs */
129 static struct applesmc_registers {
130         struct mutex mutex;             /* register read/write mutex */
131         unsigned int key_count;         /* number of SMC registers */
132         unsigned int fan_count;         /* number of fans */
133         unsigned int temp_count;        /* number of temperature registers */
134         unsigned int temp_begin;        /* temperature lower index bound */
135         unsigned int temp_end;          /* temperature upper index bound */
136         unsigned int index_count;       /* size of temperature index array */
137         int num_light_sensors;          /* number of light sensors */
138         bool has_accelerometer;         /* has motion sensor */
139         bool has_key_backlight;         /* has keyboard backlight */
140         bool init_complete;             /* true when fully initialized */
141         struct applesmc_entry *cache;   /* cached key entries */
142         const char **index;             /* temperature key index */
143 } smcreg = {
144         .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
145 };
146
147 static const int debug;
148 static struct platform_device *pdev;
149 static s16 rest_x;
150 static s16 rest_y;
151 static u8 backlight_state[2];
152
153 static struct device *hwmon_dev;
154 static struct input_polled_dev *applesmc_idev;
155
156 /*
157  * Last index written to key_at_index sysfs file, and value to use for all other
158  * key_at_index_* sysfs files.
159  */
160 static unsigned int key_at_index;
161
162 static struct workqueue_struct *applesmc_led_wq;
163
164 /*
165  * __wait_status - Wait up to 32ms for the status port to get a certain value
166  * (masked with 0x0f), returning zero if the value is obtained.  Callers must
167  * hold applesmc_lock.
168  */
169 static int __wait_status(u8 val)
170 {
171         int us;
172
173         val = val & APPLESMC_STATUS_MASK;
174
175         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
176                 udelay(us);
177                 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val)
178                         return 0;
179         }
180
181         return -EIO;
182 }
183
184 /*
185  * special treatment of command port - on newer macbooks, it seems necessary
186  * to resend the command byte before polling the status again. Callers must
187  * hold applesmc_lock.
188  */
189 static int send_command(u8 cmd)
190 {
191         int us;
192         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
193                 outb(cmd, APPLESMC_CMD_PORT);
194                 udelay(us);
195                 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == 0x0c)
196                         return 0;
197         }
198         return -EIO;
199 }
200
201 static int send_argument(const char *key)
202 {
203         int i;
204
205         for (i = 0; i < 4; i++) {
206                 outb(key[i], APPLESMC_DATA_PORT);
207                 if (__wait_status(0x04))
208                         return -EIO;
209         }
210         return 0;
211 }
212
213 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
214 {
215         int i;
216
217         if (send_command(cmd) || send_argument(key)) {
218                 pr_warn("%.4s: read arg fail\n", key);
219                 return -EIO;
220         }
221
222         outb(len, APPLESMC_DATA_PORT);
223
224         for (i = 0; i < len; i++) {
225                 if (__wait_status(0x05)) {
226                         pr_warn("%.4s: read data fail\n", key);
227                         return -EIO;
228                 }
229                 buffer[i] = inb(APPLESMC_DATA_PORT);
230         }
231
232         return 0;
233 }
234
235 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
236 {
237         int i;
238
239         if (send_command(cmd) || send_argument(key)) {
240                 pr_warn("%s: write arg fail\n", key);
241                 return -EIO;
242         }
243
244         outb(len, APPLESMC_DATA_PORT);
245
246         for (i = 0; i < len; i++) {
247                 if (__wait_status(0x04)) {
248                         pr_warn("%s: write data fail\n", key);
249                         return -EIO;
250                 }
251                 outb(buffer[i], APPLESMC_DATA_PORT);
252         }
253
254         return 0;
255 }
256
257 static int read_register_count(unsigned int *count)
258 {
259         __be32 be;
260         int ret;
261
262         ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
263         if (ret)
264                 return ret;
265
266         *count = be32_to_cpu(be);
267         return 0;
268 }
269
270 /*
271  * Serialized I/O
272  *
273  * Returns zero on success or a negative error on failure.
274  * All functions below are concurrency safe - callers should NOT hold lock.
275  */
276
277 static int applesmc_read_entry(const struct applesmc_entry *entry,
278                                u8 *buf, u8 len)
279 {
280         int ret;
281
282         if (entry->len != len)
283                 return -EINVAL;
284         mutex_lock(&smcreg.mutex);
285         ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
286         mutex_unlock(&smcreg.mutex);
287
288         return ret;
289 }
290
291 static int applesmc_write_entry(const struct applesmc_entry *entry,
292                                 const u8 *buf, u8 len)
293 {
294         int ret;
295
296         if (entry->len != len)
297                 return -EINVAL;
298         mutex_lock(&smcreg.mutex);
299         ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
300         mutex_unlock(&smcreg.mutex);
301         return ret;
302 }
303
304 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
305 {
306         struct applesmc_entry *cache = &smcreg.cache[index];
307         u8 key[4], info[6];
308         __be32 be;
309         int ret = 0;
310
311         if (cache->valid)
312                 return cache;
313
314         mutex_lock(&smcreg.mutex);
315
316         if (cache->valid)
317                 goto out;
318         be = cpu_to_be32(index);
319         ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
320         if (ret)
321                 goto out;
322         ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
323         if (ret)
324                 goto out;
325
326         memcpy(cache->key, key, 4);
327         cache->len = info[0];
328         memcpy(cache->type, &info[1], 4);
329         cache->flags = info[5];
330         cache->valid = 1;
331
332 out:
333         mutex_unlock(&smcreg.mutex);
334         if (ret)
335                 return ERR_PTR(ret);
336         return cache;
337 }
338
339 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
340 {
341         int begin = 0, end = smcreg.key_count;
342         const struct applesmc_entry *entry;
343
344         while (begin != end) {
345                 int middle = begin + (end - begin) / 2;
346                 entry = applesmc_get_entry_by_index(middle);
347                 if (IS_ERR(entry)) {
348                         *lo = 0;
349                         return PTR_ERR(entry);
350                 }
351                 if (strcmp(entry->key, key) < 0)
352                         begin = middle + 1;
353                 else
354                         end = middle;
355         }
356
357         *lo = begin;
358         return 0;
359 }
360
361 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
362 {
363         int begin = 0, end = smcreg.key_count;
364         const struct applesmc_entry *entry;
365
366         while (begin != end) {
367                 int middle = begin + (end - begin) / 2;
368                 entry = applesmc_get_entry_by_index(middle);
369                 if (IS_ERR(entry)) {
370                         *hi = smcreg.key_count;
371                         return PTR_ERR(entry);
372                 }
373                 if (strcmp(key, entry->key) < 0)
374                         end = middle;
375                 else
376                         begin = middle + 1;
377         }
378
379         *hi = begin;
380         return 0;
381 }
382
383 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
384 {
385         int begin, end;
386         int ret;
387
388         ret = applesmc_get_lower_bound(&begin, key);
389         if (ret)
390                 return ERR_PTR(ret);
391         ret = applesmc_get_upper_bound(&end, key);
392         if (ret)
393                 return ERR_PTR(ret);
394         if (end - begin != 1)
395                 return ERR_PTR(-EINVAL);
396
397         return applesmc_get_entry_by_index(begin);
398 }
399
400 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
401 {
402         const struct applesmc_entry *entry;
403
404         entry = applesmc_get_entry_by_key(key);
405         if (IS_ERR(entry))
406                 return PTR_ERR(entry);
407
408         return applesmc_read_entry(entry, buffer, len);
409 }
410
411 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
412 {
413         const struct applesmc_entry *entry;
414
415         entry = applesmc_get_entry_by_key(key);
416         if (IS_ERR(entry))
417                 return PTR_ERR(entry);
418
419         return applesmc_write_entry(entry, buffer, len);
420 }
421
422 static int applesmc_has_key(const char *key, bool *value)
423 {
424         const struct applesmc_entry *entry;
425
426         entry = applesmc_get_entry_by_key(key);
427         if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
428                 return PTR_ERR(entry);
429
430         *value = !IS_ERR(entry);
431         return 0;
432 }
433
434 /*
435  * applesmc_read_s16 - Read 16-bit signed big endian register
436  */
437 static int applesmc_read_s16(const char *key, s16 *value)
438 {
439         u8 buffer[2];
440         int ret;
441
442         ret = applesmc_read_key(key, buffer, 2);
443         if (ret)
444                 return ret;
445
446         *value = ((s16)buffer[0] << 8) | buffer[1];
447         return 0;
448 }
449
450 /*
451  * applesmc_device_init - initialize the accelerometer.  Can sleep.
452  */
453 static void applesmc_device_init(void)
454 {
455         int total;
456         u8 buffer[2];
457
458         if (!smcreg.has_accelerometer)
459                 return;
460
461         for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
462                 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
463                                 (buffer[0] != 0x00 || buffer[1] != 0x00))
464                         return;
465                 buffer[0] = 0xe0;
466                 buffer[1] = 0x00;
467                 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
468                 msleep(INIT_WAIT_MSECS);
469         }
470
471         pr_warn("failed to init the device\n");
472 }
473
474 static int applesmc_init_index(struct applesmc_registers *s)
475 {
476         const struct applesmc_entry *entry;
477         unsigned int i;
478
479         if (s->index)
480                 return 0;
481
482         s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
483         if (!s->index)
484                 return -ENOMEM;
485
486         for (i = s->temp_begin; i < s->temp_end; i++) {
487                 entry = applesmc_get_entry_by_index(i);
488                 if (IS_ERR(entry))
489                         continue;
490                 if (strcmp(entry->type, TEMP_SENSOR_TYPE))
491                         continue;
492                 s->index[s->index_count++] = entry->key;
493         }
494
495         return 0;
496 }
497
498 /*
499  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
500  */
501 static int applesmc_init_smcreg_try(void)
502 {
503         struct applesmc_registers *s = &smcreg;
504         bool left_light_sensor, right_light_sensor;
505         u8 tmp[1];
506         int ret;
507
508         if (s->init_complete)
509                 return 0;
510
511         ret = read_register_count(&s->key_count);
512         if (ret)
513                 return ret;
514
515         if (!s->cache)
516                 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
517         if (!s->cache)
518                 return -ENOMEM;
519
520         ret = applesmc_read_key(FANS_COUNT, tmp, 1);
521         if (ret)
522                 return ret;
523         s->fan_count = tmp[0];
524
525         ret = applesmc_get_lower_bound(&s->temp_begin, "T");
526         if (ret)
527                 return ret;
528         ret = applesmc_get_lower_bound(&s->temp_end, "U");
529         if (ret)
530                 return ret;
531         s->temp_count = s->temp_end - s->temp_begin;
532
533         ret = applesmc_init_index(s);
534         if (ret)
535                 return ret;
536
537         ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
538         if (ret)
539                 return ret;
540         ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
541         if (ret)
542                 return ret;
543         ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
544         if (ret)
545                 return ret;
546         ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
547         if (ret)
548                 return ret;
549
550         s->num_light_sensors = left_light_sensor + right_light_sensor;
551         s->init_complete = true;
552
553         pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
554                s->key_count, s->fan_count, s->temp_count, s->index_count,
555                s->has_accelerometer,
556                s->num_light_sensors,
557                s->has_key_backlight);
558
559         return 0;
560 }
561
562 static void applesmc_destroy_smcreg(void)
563 {
564         kfree(smcreg.index);
565         smcreg.index = NULL;
566         kfree(smcreg.cache);
567         smcreg.cache = NULL;
568         smcreg.init_complete = false;
569 }
570
571 /*
572  * applesmc_init_smcreg - Initialize register cache.
573  *
574  * Retries until initialization is successful, or the operation times out.
575  *
576  */
577 static int applesmc_init_smcreg(void)
578 {
579         int ms, ret;
580
581         for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
582                 ret = applesmc_init_smcreg_try();
583                 if (!ret) {
584                         if (ms)
585                                 pr_info("init_smcreg() took %d ms\n", ms);
586                         return 0;
587                 }
588                 msleep(INIT_WAIT_MSECS);
589         }
590
591         applesmc_destroy_smcreg();
592
593         return ret;
594 }
595
596 /* Device model stuff */
597 static int applesmc_probe(struct platform_device *dev)
598 {
599         int ret;
600
601         ret = applesmc_init_smcreg();
602         if (ret)
603                 return ret;
604
605         applesmc_device_init();
606
607         return 0;
608 }
609
610 /* Synchronize device with memorized backlight state */
611 static int applesmc_pm_resume(struct device *dev)
612 {
613         if (smcreg.has_key_backlight)
614                 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
615         return 0;
616 }
617
618 /* Reinitialize device on resume from hibernation */
619 static int applesmc_pm_restore(struct device *dev)
620 {
621         applesmc_device_init();
622         return applesmc_pm_resume(dev);
623 }
624
625 static const struct dev_pm_ops applesmc_pm_ops = {
626         .resume = applesmc_pm_resume,
627         .restore = applesmc_pm_restore,
628 };
629
630 static struct platform_driver applesmc_driver = {
631         .probe = applesmc_probe,
632         .driver = {
633                 .name = "applesmc",
634                 .owner = THIS_MODULE,
635                 .pm = &applesmc_pm_ops,
636         },
637 };
638
639 /*
640  * applesmc_calibrate - Set our "resting" values.  Callers must
641  * hold applesmc_lock.
642  */
643 static void applesmc_calibrate(void)
644 {
645         applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
646         applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
647         rest_x = -rest_x;
648 }
649
650 static void applesmc_idev_poll(struct input_polled_dev *dev)
651 {
652         struct input_dev *idev = dev->input;
653         s16 x, y;
654
655         if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
656                 return;
657         if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
658                 return;
659
660         x = -x;
661         input_report_abs(idev, ABS_X, x - rest_x);
662         input_report_abs(idev, ABS_Y, y - rest_y);
663         input_sync(idev);
664 }
665
666 /* Sysfs Files */
667
668 static ssize_t applesmc_name_show(struct device *dev,
669                                    struct device_attribute *attr, char *buf)
670 {
671         return snprintf(buf, PAGE_SIZE, "applesmc\n");
672 }
673
674 static ssize_t applesmc_position_show(struct device *dev,
675                                    struct device_attribute *attr, char *buf)
676 {
677         int ret;
678         s16 x, y, z;
679
680         ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
681         if (ret)
682                 goto out;
683         ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
684         if (ret)
685                 goto out;
686         ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
687         if (ret)
688                 goto out;
689
690 out:
691         if (ret)
692                 return ret;
693         else
694                 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
695 }
696
697 static ssize_t applesmc_light_show(struct device *dev,
698                                 struct device_attribute *attr, char *sysfsbuf)
699 {
700         const struct applesmc_entry *entry;
701         static int data_length;
702         int ret;
703         u8 left = 0, right = 0;
704         u8 buffer[10];
705
706         if (!data_length) {
707                 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
708                 if (IS_ERR(entry))
709                         return PTR_ERR(entry);
710                 if (entry->len > 10)
711                         return -ENXIO;
712                 data_length = entry->len;
713                 pr_info("light sensor data length set to %d\n", data_length);
714         }
715
716         ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
717         /* newer macbooks report a single 10-bit bigendian value */
718         if (data_length == 10) {
719                 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
720                 goto out;
721         }
722         left = buffer[2];
723         if (ret)
724                 goto out;
725         ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
726         right = buffer[2];
727
728 out:
729         if (ret)
730                 return ret;
731         else
732                 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
733 }
734
735 /* Displays sensor key as label */
736 static ssize_t applesmc_show_sensor_label(struct device *dev,
737                         struct device_attribute *devattr, char *sysfsbuf)
738 {
739         const char *key = smcreg.index[to_index(devattr)];
740
741         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
742 }
743
744 /* Displays degree Celsius * 1000 */
745 static ssize_t applesmc_show_temperature(struct device *dev,
746                         struct device_attribute *devattr, char *sysfsbuf)
747 {
748         const char *key = smcreg.index[to_index(devattr)];
749         int ret;
750         s16 value;
751         int temp;
752
753         ret = applesmc_read_s16(key, &value);
754         if (ret)
755                 return ret;
756
757         temp = 250 * (value >> 6);
758
759         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
760 }
761
762 static ssize_t applesmc_show_fan_speed(struct device *dev,
763                                 struct device_attribute *attr, char *sysfsbuf)
764 {
765         int ret;
766         unsigned int speed = 0;
767         char newkey[5];
768         u8 buffer[2];
769
770         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
771
772         ret = applesmc_read_key(newkey, buffer, 2);
773         speed = ((buffer[0] << 8 | buffer[1]) >> 2);
774
775         if (ret)
776                 return ret;
777         else
778                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
779 }
780
781 static ssize_t applesmc_store_fan_speed(struct device *dev,
782                                         struct device_attribute *attr,
783                                         const char *sysfsbuf, size_t count)
784 {
785         int ret;
786         unsigned long speed;
787         char newkey[5];
788         u8 buffer[2];
789
790         if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
791                 return -EINVAL;         /* Bigger than a 14-bit value */
792
793         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
794
795         buffer[0] = (speed >> 6) & 0xff;
796         buffer[1] = (speed << 2) & 0xff;
797         ret = applesmc_write_key(newkey, buffer, 2);
798
799         if (ret)
800                 return ret;
801         else
802                 return count;
803 }
804
805 static ssize_t applesmc_show_fan_manual(struct device *dev,
806                         struct device_attribute *attr, char *sysfsbuf)
807 {
808         int ret;
809         u16 manual = 0;
810         u8 buffer[2];
811
812         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
813         manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
814
815         if (ret)
816                 return ret;
817         else
818                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
819 }
820
821 static ssize_t applesmc_store_fan_manual(struct device *dev,
822                                          struct device_attribute *attr,
823                                          const char *sysfsbuf, size_t count)
824 {
825         int ret;
826         u8 buffer[2];
827         unsigned long input;
828         u16 val;
829
830         if (kstrtoul(sysfsbuf, 10, &input) < 0)
831                 return -EINVAL;
832
833         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
834         val = (buffer[0] << 8 | buffer[1]);
835         if (ret)
836                 goto out;
837
838         if (input)
839                 val = val | (0x01 << to_index(attr));
840         else
841                 val = val & ~(0x01 << to_index(attr));
842
843         buffer[0] = (val >> 8) & 0xFF;
844         buffer[1] = val & 0xFF;
845
846         ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
847
848 out:
849         if (ret)
850                 return ret;
851         else
852                 return count;
853 }
854
855 static ssize_t applesmc_show_fan_position(struct device *dev,
856                                 struct device_attribute *attr, char *sysfsbuf)
857 {
858         int ret;
859         char newkey[5];
860         u8 buffer[17];
861
862         sprintf(newkey, FAN_ID_FMT, to_index(attr));
863
864         ret = applesmc_read_key(newkey, buffer, 16);
865         buffer[16] = 0;
866
867         if (ret)
868                 return ret;
869         else
870                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
871 }
872
873 static ssize_t applesmc_calibrate_show(struct device *dev,
874                                 struct device_attribute *attr, char *sysfsbuf)
875 {
876         return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
877 }
878
879 static ssize_t applesmc_calibrate_store(struct device *dev,
880         struct device_attribute *attr, const char *sysfsbuf, size_t count)
881 {
882         applesmc_calibrate();
883
884         return count;
885 }
886
887 static void applesmc_backlight_set(struct work_struct *work)
888 {
889         applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
890 }
891 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
892
893 static void applesmc_brightness_set(struct led_classdev *led_cdev,
894                                                 enum led_brightness value)
895 {
896         int ret;
897
898         backlight_state[0] = value;
899         ret = queue_work(applesmc_led_wq, &backlight_work);
900
901         if (debug && (!ret))
902                 printk(KERN_DEBUG "applesmc: work was already on the queue.\n");
903 }
904
905 static ssize_t applesmc_key_count_show(struct device *dev,
906                                 struct device_attribute *attr, char *sysfsbuf)
907 {
908         int ret;
909         u8 buffer[4];
910         u32 count;
911
912         ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
913         count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
914                                                 ((u32)buffer[2]<<8) + buffer[3];
915
916         if (ret)
917                 return ret;
918         else
919                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
920 }
921
922 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
923                                 struct device_attribute *attr, char *sysfsbuf)
924 {
925         const struct applesmc_entry *entry;
926         int ret;
927
928         entry = applesmc_get_entry_by_index(key_at_index);
929         if (IS_ERR(entry))
930                 return PTR_ERR(entry);
931         ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
932         if (ret)
933                 return ret;
934
935         return entry->len;
936 }
937
938 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
939                                 struct device_attribute *attr, char *sysfsbuf)
940 {
941         const struct applesmc_entry *entry;
942
943         entry = applesmc_get_entry_by_index(key_at_index);
944         if (IS_ERR(entry))
945                 return PTR_ERR(entry);
946
947         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
948 }
949
950 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
951                                 struct device_attribute *attr, char *sysfsbuf)
952 {
953         const struct applesmc_entry *entry;
954
955         entry = applesmc_get_entry_by_index(key_at_index);
956         if (IS_ERR(entry))
957                 return PTR_ERR(entry);
958
959         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
960 }
961
962 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
963                                 struct device_attribute *attr, char *sysfsbuf)
964 {
965         const struct applesmc_entry *entry;
966
967         entry = applesmc_get_entry_by_index(key_at_index);
968         if (IS_ERR(entry))
969                 return PTR_ERR(entry);
970
971         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
972 }
973
974 static ssize_t applesmc_key_at_index_show(struct device *dev,
975                                 struct device_attribute *attr, char *sysfsbuf)
976 {
977         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
978 }
979
980 static ssize_t applesmc_key_at_index_store(struct device *dev,
981         struct device_attribute *attr, const char *sysfsbuf, size_t count)
982 {
983         unsigned long newkey;
984
985         if (kstrtoul(sysfsbuf, 10, &newkey) < 0
986             || newkey >= smcreg.key_count)
987                 return -EINVAL;
988
989         key_at_index = newkey;
990         return count;
991 }
992
993 static struct led_classdev applesmc_backlight = {
994         .name                   = "smc::kbd_backlight",
995         .default_trigger        = "nand-disk",
996         .brightness_set         = applesmc_brightness_set,
997 };
998
999 static struct applesmc_node_group info_group[] = {
1000         { "name", applesmc_name_show },
1001         { "key_count", applesmc_key_count_show },
1002         { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1003         { "key_at_index_name", applesmc_key_at_index_name_show },
1004         { "key_at_index_type", applesmc_key_at_index_type_show },
1005         { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1006         { "key_at_index_data", applesmc_key_at_index_read_show },
1007         { }
1008 };
1009
1010 static struct applesmc_node_group accelerometer_group[] = {
1011         { "position", applesmc_position_show },
1012         { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1013         { }
1014 };
1015
1016 static struct applesmc_node_group light_sensor_group[] = {
1017         { "light", applesmc_light_show },
1018         { }
1019 };
1020
1021 static struct applesmc_node_group fan_group[] = {
1022         { "fan%d_label", applesmc_show_fan_position },
1023         { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1024         { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1025         { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1026         { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1027         { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1028         { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1029         { }
1030 };
1031
1032 static struct applesmc_node_group temp_group[] = {
1033         { "temp%d_label", applesmc_show_sensor_label },
1034         { "temp%d_input", applesmc_show_temperature },
1035         { }
1036 };
1037
1038 /* Module stuff */
1039
1040 /*
1041  * applesmc_destroy_nodes - remove files and free associated memory
1042  */
1043 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1044 {
1045         struct applesmc_node_group *grp;
1046         struct applesmc_dev_attr *node;
1047
1048         for (grp = groups; grp->nodes; grp++) {
1049                 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1050                         sysfs_remove_file(&pdev->dev.kobj,
1051                                           &node->sda.dev_attr.attr);
1052                 kfree(grp->nodes);
1053                 grp->nodes = NULL;
1054         }
1055 }
1056
1057 /*
1058  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1059  */
1060 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1061 {
1062         struct applesmc_node_group *grp;
1063         struct applesmc_dev_attr *node;
1064         struct attribute *attr;
1065         int ret, i;
1066
1067         for (grp = groups; grp->format; grp++) {
1068                 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1069                 if (!grp->nodes) {
1070                         ret = -ENOMEM;
1071                         goto out;
1072                 }
1073                 for (i = 0; i < num; i++) {
1074                         node = &grp->nodes[i];
1075                         sprintf(node->name, grp->format, i + 1);
1076                         node->sda.index = (grp->option << 16) | (i & 0xffff);
1077                         node->sda.dev_attr.show = grp->show;
1078                         node->sda.dev_attr.store = grp->store;
1079                         attr = &node->sda.dev_attr.attr;
1080                         sysfs_attr_init(attr);
1081                         attr->name = node->name;
1082                         attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1083                         ret = sysfs_create_file(&pdev->dev.kobj, attr);
1084                         if (ret) {
1085                                 attr->name = NULL;
1086                                 goto out;
1087                         }
1088                 }
1089         }
1090
1091         return 0;
1092 out:
1093         applesmc_destroy_nodes(groups);
1094         return ret;
1095 }
1096
1097 /* Create accelerometer ressources */
1098 static int applesmc_create_accelerometer(void)
1099 {
1100         struct input_dev *idev;
1101         int ret;
1102
1103         if (!smcreg.has_accelerometer)
1104                 return 0;
1105
1106         ret = applesmc_create_nodes(accelerometer_group, 1);
1107         if (ret)
1108                 goto out;
1109
1110         applesmc_idev = input_allocate_polled_device();
1111         if (!applesmc_idev) {
1112                 ret = -ENOMEM;
1113                 goto out_sysfs;
1114         }
1115
1116         applesmc_idev->poll = applesmc_idev_poll;
1117         applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1118
1119         /* initial calibrate for the input device */
1120         applesmc_calibrate();
1121
1122         /* initialize the input device */
1123         idev = applesmc_idev->input;
1124         idev->name = "applesmc";
1125         idev->id.bustype = BUS_HOST;
1126         idev->dev.parent = &pdev->dev;
1127         idev->evbit[0] = BIT_MASK(EV_ABS);
1128         input_set_abs_params(idev, ABS_X,
1129                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1130         input_set_abs_params(idev, ABS_Y,
1131                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1132
1133         ret = input_register_polled_device(applesmc_idev);
1134         if (ret)
1135                 goto out_idev;
1136
1137         return 0;
1138
1139 out_idev:
1140         input_free_polled_device(applesmc_idev);
1141
1142 out_sysfs:
1143         applesmc_destroy_nodes(accelerometer_group);
1144
1145 out:
1146         pr_warn("driver init failed (ret=%d)!\n", ret);
1147         return ret;
1148 }
1149
1150 /* Release all ressources used by the accelerometer */
1151 static void applesmc_release_accelerometer(void)
1152 {
1153         if (!smcreg.has_accelerometer)
1154                 return;
1155         input_unregister_polled_device(applesmc_idev);
1156         input_free_polled_device(applesmc_idev);
1157         applesmc_destroy_nodes(accelerometer_group);
1158 }
1159
1160 static int applesmc_create_light_sensor(void)
1161 {
1162         if (!smcreg.num_light_sensors)
1163                 return 0;
1164         return applesmc_create_nodes(light_sensor_group, 1);
1165 }
1166
1167 static void applesmc_release_light_sensor(void)
1168 {
1169         if (!smcreg.num_light_sensors)
1170                 return;
1171         applesmc_destroy_nodes(light_sensor_group);
1172 }
1173
1174 static int applesmc_create_key_backlight(void)
1175 {
1176         if (!smcreg.has_key_backlight)
1177                 return 0;
1178         applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1179         if (!applesmc_led_wq)
1180                 return -ENOMEM;
1181         return led_classdev_register(&pdev->dev, &applesmc_backlight);
1182 }
1183
1184 static void applesmc_release_key_backlight(void)
1185 {
1186         if (!smcreg.has_key_backlight)
1187                 return;
1188         led_classdev_unregister(&applesmc_backlight);
1189         destroy_workqueue(applesmc_led_wq);
1190 }
1191
1192 static int applesmc_dmi_match(const struct dmi_system_id *id)
1193 {
1194         return 1;
1195 }
1196
1197 /*
1198  * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1199  * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1200  */
1201 static __initdata struct dmi_system_id applesmc_whitelist[] = {
1202         { applesmc_dmi_match, "Apple MacBook Air", {
1203           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1204           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1205         },
1206         { applesmc_dmi_match, "Apple MacBook Pro", {
1207           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1208           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1209         },
1210         { applesmc_dmi_match, "Apple MacBook", {
1211           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1212           DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1213         },
1214         { applesmc_dmi_match, "Apple Macmini", {
1215           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1216           DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1217         },
1218         { applesmc_dmi_match, "Apple MacPro", {
1219           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1220           DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1221         },
1222         { applesmc_dmi_match, "Apple iMac", {
1223           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1224           DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1225         },
1226         { .ident = NULL }
1227 };
1228
1229 static int __init applesmc_init(void)
1230 {
1231         int ret;
1232
1233         if (!dmi_check_system(applesmc_whitelist)) {
1234                 pr_warn("supported laptop not found!\n");
1235                 ret = -ENODEV;
1236                 goto out;
1237         }
1238
1239         if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1240                                                                 "applesmc")) {
1241                 ret = -ENXIO;
1242                 goto out;
1243         }
1244
1245         ret = platform_driver_register(&applesmc_driver);
1246         if (ret)
1247                 goto out_region;
1248
1249         pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1250                                                NULL, 0);
1251         if (IS_ERR(pdev)) {
1252                 ret = PTR_ERR(pdev);
1253                 goto out_driver;
1254         }
1255
1256         /* create register cache */
1257         ret = applesmc_init_smcreg();
1258         if (ret)
1259                 goto out_device;
1260
1261         ret = applesmc_create_nodes(info_group, 1);
1262         if (ret)
1263                 goto out_smcreg;
1264
1265         ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1266         if (ret)
1267                 goto out_info;
1268
1269         ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1270         if (ret)
1271                 goto out_fans;
1272
1273         ret = applesmc_create_accelerometer();
1274         if (ret)
1275                 goto out_temperature;
1276
1277         ret = applesmc_create_light_sensor();
1278         if (ret)
1279                 goto out_accelerometer;
1280
1281         ret = applesmc_create_key_backlight();
1282         if (ret)
1283                 goto out_light_sysfs;
1284
1285         hwmon_dev = hwmon_device_register(&pdev->dev);
1286         if (IS_ERR(hwmon_dev)) {
1287                 ret = PTR_ERR(hwmon_dev);
1288                 goto out_light_ledclass;
1289         }
1290
1291         return 0;
1292
1293 out_light_ledclass:
1294         applesmc_release_key_backlight();
1295 out_light_sysfs:
1296         applesmc_release_light_sensor();
1297 out_accelerometer:
1298         applesmc_release_accelerometer();
1299 out_temperature:
1300         applesmc_destroy_nodes(temp_group);
1301 out_fans:
1302         applesmc_destroy_nodes(fan_group);
1303 out_info:
1304         applesmc_destroy_nodes(info_group);
1305 out_smcreg:
1306         applesmc_destroy_smcreg();
1307 out_device:
1308         platform_device_unregister(pdev);
1309 out_driver:
1310         platform_driver_unregister(&applesmc_driver);
1311 out_region:
1312         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1313 out:
1314         pr_warn("driver init failed (ret=%d)!\n", ret);
1315         return ret;
1316 }
1317
1318 static void __exit applesmc_exit(void)
1319 {
1320         hwmon_device_unregister(hwmon_dev);
1321         applesmc_release_key_backlight();
1322         applesmc_release_light_sensor();
1323         applesmc_release_accelerometer();
1324         applesmc_destroy_nodes(temp_group);
1325         applesmc_destroy_nodes(fan_group);
1326         applesmc_destroy_nodes(info_group);
1327         applesmc_destroy_smcreg();
1328         platform_device_unregister(pdev);
1329         platform_driver_unregister(&applesmc_driver);
1330         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1331 }
1332
1333 module_init(applesmc_init);
1334 module_exit(applesmc_exit);
1335
1336 MODULE_AUTHOR("Nicolas Boichat");
1337 MODULE_DESCRIPTION("Apple SMC");
1338 MODULE_LICENSE("GPL v2");
1339 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);