hwmon: tegra: tsensor: lp0 save/restore configuration
[linux-2.6.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 <jesper.juhl@gmail.com>
12  *
13  * Fan control based on smcFanControl:
14  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
15  *
16  * This program is free software; you can redistribute it and/or modify it
17  * under the terms of the GNU General Public License v2 as published by the
18  * Free Software Foundation.
19  *
20  * This program is distributed in the hope that it will be useful, but WITHOUT
21  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
22  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
23  * more details.
24  *
25  * You should have received a copy of the GNU General Public License along with
26  * this program; if not, write to the Free Software Foundation, Inc.,
27  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
28  */
29
30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31
32 #include <linux/delay.h>
33 #include <linux/platform_device.h>
34 #include <linux/input-polldev.h>
35 #include <linux/kernel.h>
36 #include <linux/slab.h>
37 #include <linux/module.h>
38 #include <linux/timer.h>
39 #include <linux/dmi.h>
40 #include <linux/mutex.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/io.h>
43 #include <linux/leds.h>
44 #include <linux/hwmon.h>
45 #include <linux/workqueue.h>
46
47 /* data port used by Apple SMC */
48 #define APPLESMC_DATA_PORT      0x300
49 /* command/status port used by Apple SMC */
50 #define APPLESMC_CMD_PORT       0x304
51
52 #define APPLESMC_NR_PORTS       32 /* 0x300-0x31f */
53
54 #define APPLESMC_MAX_DATA_LENGTH 32
55
56 /* wait up to 32 ms for a status change. */
57 #define APPLESMC_MIN_WAIT       0x0040
58 #define APPLESMC_MAX_WAIT       0x8000
59
60 #define APPLESMC_STATUS_MASK    0x0f
61 #define APPLESMC_READ_CMD       0x10
62 #define APPLESMC_WRITE_CMD      0x11
63 #define APPLESMC_GET_KEY_BY_INDEX_CMD   0x12
64 #define APPLESMC_GET_KEY_TYPE_CMD       0x13
65
66 #define KEY_COUNT_KEY           "#KEY" /* r-o ui32 */
67
68 #define LIGHT_SENSOR_LEFT_KEY   "ALV0" /* r-o {alv (6-10 bytes) */
69 #define LIGHT_SENSOR_RIGHT_KEY  "ALV1" /* r-o {alv (6-10 bytes) */
70 #define BACKLIGHT_KEY           "LKSB" /* w-o {lkb (2 bytes) */
71
72 #define CLAMSHELL_KEY           "MSLD" /* r-o ui8 (unused) */
73
74 #define MOTION_SENSOR_X_KEY     "MO_X" /* r-o sp78 (2 bytes) */
75 #define MOTION_SENSOR_Y_KEY     "MO_Y" /* r-o sp78 (2 bytes) */
76 #define MOTION_SENSOR_Z_KEY     "MO_Z" /* r-o sp78 (2 bytes) */
77 #define MOTION_SENSOR_KEY       "MOCN" /* r/w ui16 */
78
79 #define FANS_COUNT              "FNum" /* r-o ui8 */
80 #define FANS_MANUAL             "FS! " /* r-w ui16 */
81 #define FAN_ID_FMT              "F%dID" /* r-o char[16] */
82
83 /* List of keys used to read/write fan speeds */
84 static const char *const fan_speed_fmt[] = {
85         "F%dAc",                /* actual speed */
86         "F%dMn",                /* minimum speed (rw) */
87         "F%dMx",                /* maximum speed */
88         "F%dSf",                /* safe speed - not all models */
89         "F%dTg",                /* target speed (manual: rw) */
90 };
91
92 #define INIT_TIMEOUT_MSECS      5000    /* wait up to 5s for device init ... */
93 #define INIT_WAIT_MSECS         50      /* ... in 50ms increments */
94
95 #define APPLESMC_POLL_INTERVAL  50      /* msecs */
96 #define APPLESMC_INPUT_FUZZ     4       /* input event threshold */
97 #define APPLESMC_INPUT_FLAT     4
98
99 #define SENSOR_X 0
100 #define SENSOR_Y 1
101 #define SENSOR_Z 2
102
103 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
104 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
105
106 /* Dynamic device node attributes */
107 struct applesmc_dev_attr {
108         struct sensor_device_attribute sda;     /* hwmon attributes */
109         char name[32];                          /* room for node file name */
110 };
111
112 /* Dynamic device node group */
113 struct applesmc_node_group {
114         char *format;                           /* format string */
115         void *show;                             /* show function */
116         void *store;                            /* store function */
117         int option;                             /* function argument */
118         struct applesmc_dev_attr *nodes;        /* dynamic node array */
119 };
120
121 /* AppleSMC entry - cached register information */
122 struct applesmc_entry {
123         char key[5];            /* four-letter key code */
124         u8 valid;               /* set when entry is successfully read once */
125         u8 len;                 /* bounded by APPLESMC_MAX_DATA_LENGTH */
126         char type[5];           /* four-letter type code */
127         u8 flags;               /* 0x10: func; 0x40: write; 0x80: read */
128 };
129
130 /* Register lookup and registers common to all SMCs */
131 static struct applesmc_registers {
132         struct mutex mutex;             /* register read/write mutex */
133         unsigned int key_count;         /* number of SMC registers */
134         unsigned int fan_count;         /* number of fans */
135         unsigned int temp_count;        /* number of temperature registers */
136         unsigned int temp_begin;        /* temperature lower index bound */
137         unsigned int temp_end;          /* temperature upper index bound */
138         int num_light_sensors;          /* number of light sensors */
139         bool has_accelerometer;         /* has motion sensor */
140         bool has_key_backlight;         /* has keyboard backlight */
141         bool init_complete;             /* true when fully initialized */
142         struct applesmc_entry *cache;   /* cached key entries */
143 } smcreg = {
144         .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
145 };
146
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("%s: 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("%s: 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                         return PTR_ERR(entry);
349                 if (strcmp(entry->key, key) < 0)
350                         begin = middle + 1;
351                 else
352                         end = middle;
353         }
354
355         *lo = begin;
356         return 0;
357 }
358
359 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
360 {
361         int begin = 0, end = smcreg.key_count;
362         const struct applesmc_entry *entry;
363
364         while (begin != end) {
365                 int middle = begin + (end - begin) / 2;
366                 entry = applesmc_get_entry_by_index(middle);
367                 if (IS_ERR(entry))
368                         return PTR_ERR(entry);
369                 if (strcmp(key, entry->key) < 0)
370                         end = middle;
371                 else
372                         begin = middle + 1;
373         }
374
375         *hi = begin;
376         return 0;
377 }
378
379 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
380 {
381         int begin, end;
382         int ret;
383
384         ret = applesmc_get_lower_bound(&begin, key);
385         if (ret)
386                 return ERR_PTR(ret);
387         ret = applesmc_get_upper_bound(&end, key);
388         if (ret)
389                 return ERR_PTR(ret);
390         if (end - begin != 1)
391                 return ERR_PTR(-EINVAL);
392
393         return applesmc_get_entry_by_index(begin);
394 }
395
396 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
397 {
398         const struct applesmc_entry *entry;
399
400         entry = applesmc_get_entry_by_key(key);
401         if (IS_ERR(entry))
402                 return PTR_ERR(entry);
403
404         return applesmc_read_entry(entry, buffer, len);
405 }
406
407 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
408 {
409         const struct applesmc_entry *entry;
410
411         entry = applesmc_get_entry_by_key(key);
412         if (IS_ERR(entry))
413                 return PTR_ERR(entry);
414
415         return applesmc_write_entry(entry, buffer, len);
416 }
417
418 static int applesmc_has_key(const char *key, bool *value)
419 {
420         const struct applesmc_entry *entry;
421
422         entry = applesmc_get_entry_by_key(key);
423         if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
424                 return PTR_ERR(entry);
425
426         *value = !IS_ERR(entry);
427         return 0;
428 }
429
430 /*
431  * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z).
432  */
433 static int applesmc_read_motion_sensor(int index, s16 *value)
434 {
435         u8 buffer[2];
436         int ret;
437
438         switch (index) {
439         case SENSOR_X:
440                 ret = applesmc_read_key(MOTION_SENSOR_X_KEY, buffer, 2);
441                 break;
442         case SENSOR_Y:
443                 ret = applesmc_read_key(MOTION_SENSOR_Y_KEY, buffer, 2);
444                 break;
445         case SENSOR_Z:
446                 ret = applesmc_read_key(MOTION_SENSOR_Z_KEY, buffer, 2);
447                 break;
448         default:
449                 ret = -EINVAL;
450         }
451
452         *value = ((s16)buffer[0] << 8) | buffer[1];
453
454         return ret;
455 }
456
457 /*
458  * applesmc_device_init - initialize the accelerometer.  Can sleep.
459  */
460 static void applesmc_device_init(void)
461 {
462         int total;
463         u8 buffer[2];
464
465         if (!smcreg.has_accelerometer)
466                 return;
467
468         for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
469                 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
470                                 (buffer[0] != 0x00 || buffer[1] != 0x00))
471                         return;
472                 buffer[0] = 0xe0;
473                 buffer[1] = 0x00;
474                 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
475                 msleep(INIT_WAIT_MSECS);
476         }
477
478         pr_warn("failed to init the device\n");
479 }
480
481 /*
482  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
483  */
484 static int applesmc_init_smcreg_try(void)
485 {
486         struct applesmc_registers *s = &smcreg;
487         bool left_light_sensor, right_light_sensor;
488         u8 tmp[1];
489         int ret;
490
491         if (s->init_complete)
492                 return 0;
493
494         ret = read_register_count(&s->key_count);
495         if (ret)
496                 return ret;
497
498         if (!s->cache)
499                 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
500         if (!s->cache)
501                 return -ENOMEM;
502
503         ret = applesmc_read_key(FANS_COUNT, tmp, 1);
504         if (ret)
505                 return ret;
506         s->fan_count = tmp[0];
507
508         ret = applesmc_get_lower_bound(&s->temp_begin, "T");
509         if (ret)
510                 return ret;
511         ret = applesmc_get_lower_bound(&s->temp_end, "U");
512         if (ret)
513                 return ret;
514         s->temp_count = s->temp_end - s->temp_begin;
515
516         ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
517         if (ret)
518                 return ret;
519         ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
520         if (ret)
521                 return ret;
522         ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
523         if (ret)
524                 return ret;
525         ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
526         if (ret)
527                 return ret;
528
529         s->num_light_sensors = left_light_sensor + right_light_sensor;
530         s->init_complete = true;
531
532         pr_info("key=%d fan=%d temp=%d acc=%d lux=%d kbd=%d\n",
533                s->key_count, s->fan_count, s->temp_count,
534                s->has_accelerometer,
535                s->num_light_sensors,
536                s->has_key_backlight);
537
538         return 0;
539 }
540
541 /*
542  * applesmc_init_smcreg - Initialize register cache.
543  *
544  * Retries until initialization is successful, or the operation times out.
545  *
546  */
547 static int applesmc_init_smcreg(void)
548 {
549         int ms, ret;
550
551         for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
552                 ret = applesmc_init_smcreg_try();
553                 if (!ret) {
554                         if (ms)
555                                 pr_info("init_smcreg() took %d ms\n", ms);
556                         return 0;
557                 }
558                 msleep(INIT_WAIT_MSECS);
559         }
560
561         kfree(smcreg.cache);
562         smcreg.cache = NULL;
563
564         return ret;
565 }
566
567 static void applesmc_destroy_smcreg(void)
568 {
569         kfree(smcreg.cache);
570         smcreg.cache = NULL;
571         smcreg.init_complete = false;
572 }
573
574 /* Device model stuff */
575 static int applesmc_probe(struct platform_device *dev)
576 {
577         int ret;
578
579         ret = applesmc_init_smcreg();
580         if (ret)
581                 return ret;
582
583         applesmc_device_init();
584
585         return 0;
586 }
587
588 /* Synchronize device with memorized backlight state */
589 static int applesmc_pm_resume(struct device *dev)
590 {
591         if (smcreg.has_key_backlight)
592                 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
593         return 0;
594 }
595
596 /* Reinitialize device on resume from hibernation */
597 static int applesmc_pm_restore(struct device *dev)
598 {
599         applesmc_device_init();
600         return applesmc_pm_resume(dev);
601 }
602
603 static const struct dev_pm_ops applesmc_pm_ops = {
604         .resume = applesmc_pm_resume,
605         .restore = applesmc_pm_restore,
606 };
607
608 static struct platform_driver applesmc_driver = {
609         .probe = applesmc_probe,
610         .driver = {
611                 .name = "applesmc",
612                 .owner = THIS_MODULE,
613                 .pm = &applesmc_pm_ops,
614         },
615 };
616
617 /*
618  * applesmc_calibrate - Set our "resting" values.  Callers must
619  * hold applesmc_lock.
620  */
621 static void applesmc_calibrate(void)
622 {
623         applesmc_read_motion_sensor(SENSOR_X, &rest_x);
624         applesmc_read_motion_sensor(SENSOR_Y, &rest_y);
625         rest_x = -rest_x;
626 }
627
628 static void applesmc_idev_poll(struct input_polled_dev *dev)
629 {
630         struct input_dev *idev = dev->input;
631         s16 x, y;
632
633         if (applesmc_read_motion_sensor(SENSOR_X, &x))
634                 return;
635         if (applesmc_read_motion_sensor(SENSOR_Y, &y))
636                 return;
637
638         x = -x;
639         input_report_abs(idev, ABS_X, x - rest_x);
640         input_report_abs(idev, ABS_Y, y - rest_y);
641         input_sync(idev);
642 }
643
644 /* Sysfs Files */
645
646 static ssize_t applesmc_name_show(struct device *dev,
647                                    struct device_attribute *attr, char *buf)
648 {
649         return snprintf(buf, PAGE_SIZE, "applesmc\n");
650 }
651
652 static ssize_t applesmc_position_show(struct device *dev,
653                                    struct device_attribute *attr, char *buf)
654 {
655         int ret;
656         s16 x, y, z;
657
658         ret = applesmc_read_motion_sensor(SENSOR_X, &x);
659         if (ret)
660                 goto out;
661         ret = applesmc_read_motion_sensor(SENSOR_Y, &y);
662         if (ret)
663                 goto out;
664         ret = applesmc_read_motion_sensor(SENSOR_Z, &z);
665         if (ret)
666                 goto out;
667
668 out:
669         if (ret)
670                 return ret;
671         else
672                 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
673 }
674
675 static ssize_t applesmc_light_show(struct device *dev,
676                                 struct device_attribute *attr, char *sysfsbuf)
677 {
678         const struct applesmc_entry *entry;
679         static int data_length;
680         int ret;
681         u8 left = 0, right = 0;
682         u8 buffer[10];
683
684         if (!data_length) {
685                 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
686                 if (IS_ERR(entry))
687                         return PTR_ERR(entry);
688                 if (entry->len > 10)
689                         return -ENXIO;
690                 data_length = entry->len;
691                 pr_info("light sensor data length set to %d\n", data_length);
692         }
693
694         ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
695         /* newer macbooks report a single 10-bit bigendian value */
696         if (data_length == 10) {
697                 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
698                 goto out;
699         }
700         left = buffer[2];
701         if (ret)
702                 goto out;
703         ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
704         right = buffer[2];
705
706 out:
707         if (ret)
708                 return ret;
709         else
710                 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
711 }
712
713 /* Displays sensor key as label */
714 static ssize_t applesmc_show_sensor_label(struct device *dev,
715                         struct device_attribute *devattr, char *sysfsbuf)
716 {
717         int index = smcreg.temp_begin + to_index(devattr);
718         const struct applesmc_entry *entry;
719
720         entry = applesmc_get_entry_by_index(index);
721         if (IS_ERR(entry))
722                 return PTR_ERR(entry);
723
724         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
725 }
726
727 /* Displays degree Celsius * 1000 */
728 static ssize_t applesmc_show_temperature(struct device *dev,
729                         struct device_attribute *devattr, char *sysfsbuf)
730 {
731         int index = smcreg.temp_begin + to_index(devattr);
732         const struct applesmc_entry *entry;
733         int ret;
734         u8 buffer[2];
735         unsigned int temp;
736
737         entry = applesmc_get_entry_by_index(index);
738         if (IS_ERR(entry))
739                 return PTR_ERR(entry);
740         if (entry->len > 2)
741                 return -EINVAL;
742
743         ret = applesmc_read_entry(entry, buffer, entry->len);
744         if (ret)
745                 return ret;
746
747         if (entry->len == 2) {
748                 temp = buffer[0] * 1000;
749                 temp += (buffer[1] >> 6) * 250;
750         } else {
751                 temp = buffer[0] * 4000;
752         }
753
754         return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", temp);
755 }
756
757 static ssize_t applesmc_show_fan_speed(struct device *dev,
758                                 struct device_attribute *attr, char *sysfsbuf)
759 {
760         int ret;
761         unsigned int speed = 0;
762         char newkey[5];
763         u8 buffer[2];
764
765         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
766
767         ret = applesmc_read_key(newkey, buffer, 2);
768         speed = ((buffer[0] << 8 | buffer[1]) >> 2);
769
770         if (ret)
771                 return ret;
772         else
773                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
774 }
775
776 static ssize_t applesmc_store_fan_speed(struct device *dev,
777                                         struct device_attribute *attr,
778                                         const char *sysfsbuf, size_t count)
779 {
780         int ret;
781         unsigned long speed;
782         char newkey[5];
783         u8 buffer[2];
784
785         if (strict_strtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
786                 return -EINVAL;         /* Bigger than a 14-bit value */
787
788         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
789
790         buffer[0] = (speed >> 6) & 0xff;
791         buffer[1] = (speed << 2) & 0xff;
792         ret = applesmc_write_key(newkey, buffer, 2);
793
794         if (ret)
795                 return ret;
796         else
797                 return count;
798 }
799
800 static ssize_t applesmc_show_fan_manual(struct device *dev,
801                         struct device_attribute *attr, char *sysfsbuf)
802 {
803         int ret;
804         u16 manual = 0;
805         u8 buffer[2];
806
807         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
808         manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
809
810         if (ret)
811                 return ret;
812         else
813                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
814 }
815
816 static ssize_t applesmc_store_fan_manual(struct device *dev,
817                                          struct device_attribute *attr,
818                                          const char *sysfsbuf, size_t count)
819 {
820         int ret;
821         u8 buffer[2];
822         unsigned long input;
823         u16 val;
824
825         if (strict_strtoul(sysfsbuf, 10, &input) < 0)
826                 return -EINVAL;
827
828         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
829         val = (buffer[0] << 8 | buffer[1]);
830         if (ret)
831                 goto out;
832
833         if (input)
834                 val = val | (0x01 << to_index(attr));
835         else
836                 val = val & ~(0x01 << to_index(attr));
837
838         buffer[0] = (val >> 8) & 0xFF;
839         buffer[1] = val & 0xFF;
840
841         ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
842
843 out:
844         if (ret)
845                 return ret;
846         else
847                 return count;
848 }
849
850 static ssize_t applesmc_show_fan_position(struct device *dev,
851                                 struct device_attribute *attr, char *sysfsbuf)
852 {
853         int ret;
854         char newkey[5];
855         u8 buffer[17];
856
857         sprintf(newkey, FAN_ID_FMT, to_index(attr));
858
859         ret = applesmc_read_key(newkey, buffer, 16);
860         buffer[16] = 0;
861
862         if (ret)
863                 return ret;
864         else
865                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
866 }
867
868 static ssize_t applesmc_calibrate_show(struct device *dev,
869                                 struct device_attribute *attr, char *sysfsbuf)
870 {
871         return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
872 }
873
874 static ssize_t applesmc_calibrate_store(struct device *dev,
875         struct device_attribute *attr, const char *sysfsbuf, size_t count)
876 {
877         applesmc_calibrate();
878
879         return count;
880 }
881
882 static void applesmc_backlight_set(struct work_struct *work)
883 {
884         applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
885 }
886 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
887
888 static void applesmc_brightness_set(struct led_classdev *led_cdev,
889                                                 enum led_brightness value)
890 {
891         int ret;
892
893         backlight_state[0] = value;
894         ret = queue_work(applesmc_led_wq, &backlight_work);
895
896         if (debug && (!ret))
897                 printk(KERN_DEBUG "applesmc: work was already on the queue.\n");
898 }
899
900 static ssize_t applesmc_key_count_show(struct device *dev,
901                                 struct device_attribute *attr, char *sysfsbuf)
902 {
903         int ret;
904         u8 buffer[4];
905         u32 count;
906
907         ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
908         count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
909                                                 ((u32)buffer[2]<<8) + buffer[3];
910
911         if (ret)
912                 return ret;
913         else
914                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
915 }
916
917 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
918                                 struct device_attribute *attr, char *sysfsbuf)
919 {
920         const struct applesmc_entry *entry;
921         int ret;
922
923         entry = applesmc_get_entry_by_index(key_at_index);
924         if (IS_ERR(entry))
925                 return PTR_ERR(entry);
926         ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
927         if (ret)
928                 return ret;
929
930         return entry->len;
931 }
932
933 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
934                                 struct device_attribute *attr, char *sysfsbuf)
935 {
936         const struct applesmc_entry *entry;
937
938         entry = applesmc_get_entry_by_index(key_at_index);
939         if (IS_ERR(entry))
940                 return PTR_ERR(entry);
941
942         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
943 }
944
945 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
946                                 struct device_attribute *attr, char *sysfsbuf)
947 {
948         const struct applesmc_entry *entry;
949
950         entry = applesmc_get_entry_by_index(key_at_index);
951         if (IS_ERR(entry))
952                 return PTR_ERR(entry);
953
954         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
955 }
956
957 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
958                                 struct device_attribute *attr, char *sysfsbuf)
959 {
960         const struct applesmc_entry *entry;
961
962         entry = applesmc_get_entry_by_index(key_at_index);
963         if (IS_ERR(entry))
964                 return PTR_ERR(entry);
965
966         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
967 }
968
969 static ssize_t applesmc_key_at_index_show(struct device *dev,
970                                 struct device_attribute *attr, char *sysfsbuf)
971 {
972         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
973 }
974
975 static ssize_t applesmc_key_at_index_store(struct device *dev,
976         struct device_attribute *attr, const char *sysfsbuf, size_t count)
977 {
978         unsigned long newkey;
979
980         if (strict_strtoul(sysfsbuf, 10, &newkey) < 0
981             || newkey >= smcreg.key_count)
982                 return -EINVAL;
983
984         key_at_index = newkey;
985         return count;
986 }
987
988 static struct led_classdev applesmc_backlight = {
989         .name                   = "smc::kbd_backlight",
990         .default_trigger        = "nand-disk",
991         .brightness_set         = applesmc_brightness_set,
992 };
993
994 static struct applesmc_node_group info_group[] = {
995         { "name", applesmc_name_show },
996         { "key_count", applesmc_key_count_show },
997         { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
998         { "key_at_index_name", applesmc_key_at_index_name_show },
999         { "key_at_index_type", applesmc_key_at_index_type_show },
1000         { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1001         { "key_at_index_data", applesmc_key_at_index_read_show },
1002         { }
1003 };
1004
1005 static struct applesmc_node_group accelerometer_group[] = {
1006         { "position", applesmc_position_show },
1007         { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1008         { }
1009 };
1010
1011 static struct applesmc_node_group light_sensor_group[] = {
1012         { "light", applesmc_light_show },
1013         { }
1014 };
1015
1016 static struct applesmc_node_group fan_group[] = {
1017         { "fan%d_label", applesmc_show_fan_position },
1018         { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1019         { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1020         { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1021         { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1022         { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1023         { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1024         { }
1025 };
1026
1027 static struct applesmc_node_group temp_group[] = {
1028         { "temp%d_label", applesmc_show_sensor_label },
1029         { "temp%d_input", applesmc_show_temperature },
1030         { }
1031 };
1032
1033 /* Module stuff */
1034
1035 /*
1036  * applesmc_destroy_nodes - remove files and free associated memory
1037  */
1038 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1039 {
1040         struct applesmc_node_group *grp;
1041         struct applesmc_dev_attr *node;
1042
1043         for (grp = groups; grp->nodes; grp++) {
1044                 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1045                         sysfs_remove_file(&pdev->dev.kobj,
1046                                           &node->sda.dev_attr.attr);
1047                 kfree(grp->nodes);
1048                 grp->nodes = NULL;
1049         }
1050 }
1051
1052 /*
1053  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1054  */
1055 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1056 {
1057         struct applesmc_node_group *grp;
1058         struct applesmc_dev_attr *node;
1059         struct attribute *attr;
1060         int ret, i;
1061
1062         for (grp = groups; grp->format; grp++) {
1063                 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1064                 if (!grp->nodes) {
1065                         ret = -ENOMEM;
1066                         goto out;
1067                 }
1068                 for (i = 0; i < num; i++) {
1069                         node = &grp->nodes[i];
1070                         sprintf(node->name, grp->format, i + 1);
1071                         node->sda.index = (grp->option << 16) | (i & 0xffff);
1072                         node->sda.dev_attr.show = grp->show;
1073                         node->sda.dev_attr.store = grp->store;
1074                         attr = &node->sda.dev_attr.attr;
1075                         sysfs_attr_init(attr);
1076                         attr->name = node->name;
1077                         attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1078                         ret = sysfs_create_file(&pdev->dev.kobj, attr);
1079                         if (ret) {
1080                                 attr->name = NULL;
1081                                 goto out;
1082                         }
1083                 }
1084         }
1085
1086         return 0;
1087 out:
1088         applesmc_destroy_nodes(groups);
1089         return ret;
1090 }
1091
1092 /* Create accelerometer ressources */
1093 static int applesmc_create_accelerometer(void)
1094 {
1095         struct input_dev *idev;
1096         int ret;
1097
1098         if (!smcreg.has_accelerometer)
1099                 return 0;
1100
1101         ret = applesmc_create_nodes(accelerometer_group, 1);
1102         if (ret)
1103                 goto out;
1104
1105         applesmc_idev = input_allocate_polled_device();
1106         if (!applesmc_idev) {
1107                 ret = -ENOMEM;
1108                 goto out_sysfs;
1109         }
1110
1111         applesmc_idev->poll = applesmc_idev_poll;
1112         applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1113
1114         /* initial calibrate for the input device */
1115         applesmc_calibrate();
1116
1117         /* initialize the input device */
1118         idev = applesmc_idev->input;
1119         idev->name = "applesmc";
1120         idev->id.bustype = BUS_HOST;
1121         idev->dev.parent = &pdev->dev;
1122         idev->evbit[0] = BIT_MASK(EV_ABS);
1123         input_set_abs_params(idev, ABS_X,
1124                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1125         input_set_abs_params(idev, ABS_Y,
1126                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1127
1128         ret = input_register_polled_device(applesmc_idev);
1129         if (ret)
1130                 goto out_idev;
1131
1132         return 0;
1133
1134 out_idev:
1135         input_free_polled_device(applesmc_idev);
1136
1137 out_sysfs:
1138         applesmc_destroy_nodes(accelerometer_group);
1139
1140 out:
1141         pr_warn("driver init failed (ret=%d)!\n", ret);
1142         return ret;
1143 }
1144
1145 /* Release all ressources used by the accelerometer */
1146 static void applesmc_release_accelerometer(void)
1147 {
1148         if (!smcreg.has_accelerometer)
1149                 return;
1150         input_unregister_polled_device(applesmc_idev);
1151         input_free_polled_device(applesmc_idev);
1152         applesmc_destroy_nodes(accelerometer_group);
1153 }
1154
1155 static int applesmc_create_light_sensor(void)
1156 {
1157         if (!smcreg.num_light_sensors)
1158                 return 0;
1159         return applesmc_create_nodes(light_sensor_group, 1);
1160 }
1161
1162 static void applesmc_release_light_sensor(void)
1163 {
1164         if (!smcreg.num_light_sensors)
1165                 return;
1166         applesmc_destroy_nodes(light_sensor_group);
1167 }
1168
1169 static int applesmc_create_key_backlight(void)
1170 {
1171         if (!smcreg.has_key_backlight)
1172                 return 0;
1173         applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1174         if (!applesmc_led_wq)
1175                 return -ENOMEM;
1176         return led_classdev_register(&pdev->dev, &applesmc_backlight);
1177 }
1178
1179 static void applesmc_release_key_backlight(void)
1180 {
1181         if (!smcreg.has_key_backlight)
1182                 return;
1183         led_classdev_unregister(&applesmc_backlight);
1184         destroy_workqueue(applesmc_led_wq);
1185 }
1186
1187 static int applesmc_dmi_match(const struct dmi_system_id *id)
1188 {
1189         return 1;
1190 }
1191
1192 /* Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1193  * So we need to put "Apple MacBook Pro" before "Apple MacBook". */
1194 static __initdata struct dmi_system_id applesmc_whitelist[] = {
1195         { applesmc_dmi_match, "Apple MacBook Air", {
1196           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1197           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1198         },
1199         { applesmc_dmi_match, "Apple MacBook Pro", {
1200           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1201           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1202         },
1203         { applesmc_dmi_match, "Apple MacBook", {
1204           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1205           DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1206         },
1207         { applesmc_dmi_match, "Apple Macmini", {
1208           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1209           DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1210         },
1211         { applesmc_dmi_match, "Apple MacPro", {
1212           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1213           DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1214         },
1215         { applesmc_dmi_match, "Apple iMac", {
1216           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1217           DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1218         },
1219         { .ident = NULL }
1220 };
1221
1222 static int __init applesmc_init(void)
1223 {
1224         int ret;
1225
1226         if (!dmi_check_system(applesmc_whitelist)) {
1227                 pr_warn("supported laptop not found!\n");
1228                 ret = -ENODEV;
1229                 goto out;
1230         }
1231
1232         if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1233                                                                 "applesmc")) {
1234                 ret = -ENXIO;
1235                 goto out;
1236         }
1237
1238         ret = platform_driver_register(&applesmc_driver);
1239         if (ret)
1240                 goto out_region;
1241
1242         pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1243                                                NULL, 0);
1244         if (IS_ERR(pdev)) {
1245                 ret = PTR_ERR(pdev);
1246                 goto out_driver;
1247         }
1248
1249         /* create register cache */
1250         ret = applesmc_init_smcreg();
1251         if (ret)
1252                 goto out_device;
1253
1254         ret = applesmc_create_nodes(info_group, 1);
1255         if (ret)
1256                 goto out_smcreg;
1257
1258         ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1259         if (ret)
1260                 goto out_info;
1261
1262         ret = applesmc_create_nodes(temp_group, smcreg.temp_count);
1263         if (ret)
1264                 goto out_fans;
1265
1266         ret = applesmc_create_accelerometer();
1267         if (ret)
1268                 goto out_temperature;
1269
1270         ret = applesmc_create_light_sensor();
1271         if (ret)
1272                 goto out_accelerometer;
1273
1274         ret = applesmc_create_key_backlight();
1275         if (ret)
1276                 goto out_light_sysfs;
1277
1278         hwmon_dev = hwmon_device_register(&pdev->dev);
1279         if (IS_ERR(hwmon_dev)) {
1280                 ret = PTR_ERR(hwmon_dev);
1281                 goto out_light_ledclass;
1282         }
1283
1284         return 0;
1285
1286 out_light_ledclass:
1287         applesmc_release_key_backlight();
1288 out_light_sysfs:
1289         applesmc_release_light_sensor();
1290 out_accelerometer:
1291         applesmc_release_accelerometer();
1292 out_temperature:
1293         applesmc_destroy_nodes(temp_group);
1294 out_fans:
1295         applesmc_destroy_nodes(fan_group);
1296 out_info:
1297         applesmc_destroy_nodes(info_group);
1298 out_smcreg:
1299         applesmc_destroy_smcreg();
1300 out_device:
1301         platform_device_unregister(pdev);
1302 out_driver:
1303         platform_driver_unregister(&applesmc_driver);
1304 out_region:
1305         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1306 out:
1307         pr_warn("driver init failed (ret=%d)!\n", ret);
1308         return ret;
1309 }
1310
1311 static void __exit applesmc_exit(void)
1312 {
1313         hwmon_device_unregister(hwmon_dev);
1314         applesmc_release_key_backlight();
1315         applesmc_release_light_sensor();
1316         applesmc_release_accelerometer();
1317         applesmc_destroy_nodes(temp_group);
1318         applesmc_destroy_nodes(fan_group);
1319         applesmc_destroy_nodes(info_group);
1320         applesmc_destroy_smcreg();
1321         platform_device_unregister(pdev);
1322         platform_driver_unregister(&applesmc_driver);
1323         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1324 }
1325
1326 module_init(applesmc_init);
1327 module_exit(applesmc_exit);
1328
1329 MODULE_AUTHOR("Nicolas Boichat");
1330 MODULE_DESCRIPTION("Apple SMC");
1331 MODULE_LICENSE("GPL v2");
1332 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);