Merge branch 'drm-fixes-5.0' of git://people.freedesktop.org/~agd5f/linux into drm...
[linux-2.6-microblaze.git] / drivers / regulator / max8997-regulator.c
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // max8997.c - Regulator driver for the Maxim 8997/8966
4 //
5 // Copyright (C) 2011 Samsung Electronics
6 // MyungJoo Ham <myungjoo.ham@samsung.com>
7 //
8 // This driver is based on max8998.c
9
10 #include <linux/bug.h>
11 #include <linux/err.h>
12 #include <linux/gpio.h>
13 #include <linux/of_gpio.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/mfd/max8997.h>
20 #include <linux/mfd/max8997-private.h>
21 #include <linux/regulator/of_regulator.h>
22
23 struct max8997_data {
24         struct device *dev;
25         struct max8997_dev *iodev;
26         int num_regulators;
27         int ramp_delay; /* in mV/us */
28
29         bool buck1_gpiodvs;
30         bool buck2_gpiodvs;
31         bool buck5_gpiodvs;
32         u8 buck1_vol[8];
33         u8 buck2_vol[8];
34         u8 buck5_vol[8];
35         int buck125_gpios[3];
36         int buck125_gpioindex;
37         bool ignore_gpiodvs_side_effect;
38
39         u8 saved_states[MAX8997_REG_MAX];
40 };
41
42 static const unsigned int safeoutvolt[] = {
43         4850000,
44         4900000,
45         4950000,
46         3300000,
47 };
48
49 static inline void max8997_set_gpio(struct max8997_data *max8997)
50 {
51         int set3 = (max8997->buck125_gpioindex) & 0x1;
52         int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1;
53         int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1;
54
55         gpio_set_value(max8997->buck125_gpios[0], set1);
56         gpio_set_value(max8997->buck125_gpios[1], set2);
57         gpio_set_value(max8997->buck125_gpios[2], set3);
58 }
59
60 struct voltage_map_desc {
61         int min;
62         int max;
63         int step;
64 };
65
66 /* Voltage maps in uV */
67 static const struct voltage_map_desc ldo_voltage_map_desc = {
68         .min = 800000,  .max = 3950000, .step = 50000,
69 }; /* LDO1 ~ 18, 21 all */
70
71 static const struct voltage_map_desc buck1245_voltage_map_desc = {
72         .min = 650000,  .max = 2225000, .step = 25000,
73 }; /* Buck1, 2, 4, 5 */
74
75 static const struct voltage_map_desc buck37_voltage_map_desc = {
76         .min = 750000,  .max = 3900000, .step = 50000,
77 }; /* Buck3, 7 */
78
79 /* current map in uA */
80 static const struct voltage_map_desc charger_current_map_desc = {
81         .min = 200000,  .max = 950000,  .step = 50000,
82 };
83
84 static const struct voltage_map_desc topoff_current_map_desc = {
85         .min = 50000,   .max = 200000,  .step = 10000,
86 };
87
88 static const struct voltage_map_desc *reg_voltage_map[] = {
89         [MAX8997_LDO1] = &ldo_voltage_map_desc,
90         [MAX8997_LDO2] = &ldo_voltage_map_desc,
91         [MAX8997_LDO3] = &ldo_voltage_map_desc,
92         [MAX8997_LDO4] = &ldo_voltage_map_desc,
93         [MAX8997_LDO5] = &ldo_voltage_map_desc,
94         [MAX8997_LDO6] = &ldo_voltage_map_desc,
95         [MAX8997_LDO7] = &ldo_voltage_map_desc,
96         [MAX8997_LDO8] = &ldo_voltage_map_desc,
97         [MAX8997_LDO9] = &ldo_voltage_map_desc,
98         [MAX8997_LDO10] = &ldo_voltage_map_desc,
99         [MAX8997_LDO11] = &ldo_voltage_map_desc,
100         [MAX8997_LDO12] = &ldo_voltage_map_desc,
101         [MAX8997_LDO13] = &ldo_voltage_map_desc,
102         [MAX8997_LDO14] = &ldo_voltage_map_desc,
103         [MAX8997_LDO15] = &ldo_voltage_map_desc,
104         [MAX8997_LDO16] = &ldo_voltage_map_desc,
105         [MAX8997_LDO17] = &ldo_voltage_map_desc,
106         [MAX8997_LDO18] = &ldo_voltage_map_desc,
107         [MAX8997_LDO21] = &ldo_voltage_map_desc,
108         [MAX8997_BUCK1] = &buck1245_voltage_map_desc,
109         [MAX8997_BUCK2] = &buck1245_voltage_map_desc,
110         [MAX8997_BUCK3] = &buck37_voltage_map_desc,
111         [MAX8997_BUCK4] = &buck1245_voltage_map_desc,
112         [MAX8997_BUCK5] = &buck1245_voltage_map_desc,
113         [MAX8997_BUCK6] = NULL,
114         [MAX8997_BUCK7] = &buck37_voltage_map_desc,
115         [MAX8997_EN32KHZ_AP] = NULL,
116         [MAX8997_EN32KHZ_CP] = NULL,
117         [MAX8997_ENVICHG] = NULL,
118         [MAX8997_ESAFEOUT1] = NULL,
119         [MAX8997_ESAFEOUT2] = NULL,
120         [MAX8997_CHARGER_CV] = NULL,
121         [MAX8997_CHARGER] = &charger_current_map_desc,
122         [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc,
123 };
124
125 static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev,
126                 unsigned int selector)
127 {
128         int rid = rdev_get_id(rdev);
129
130         if (rid != MAX8997_CHARGER_CV)
131                 goto err;
132
133         switch (selector) {
134         case 0x00:
135                 return 4200000;
136         case 0x01 ... 0x0E:
137                 return 4000000 + 20000 * (selector - 0x01);
138         case 0x0F:
139                 return 4350000;
140         default:
141                 return -EINVAL;
142         }
143 err:
144         return -EINVAL;
145 }
146
147 static int max8997_list_voltage(struct regulator_dev *rdev,
148                 unsigned int selector)
149 {
150         const struct voltage_map_desc *desc;
151         int rid = rdev_get_id(rdev);
152         int val;
153
154         if (rid < 0 || rid >= ARRAY_SIZE(reg_voltage_map))
155                 return -EINVAL;
156
157         desc = reg_voltage_map[rid];
158         if (desc == NULL)
159                 return -EINVAL;
160
161         val = desc->min + desc->step * selector;
162         if (val > desc->max)
163                 return -EINVAL;
164
165         return val;
166 }
167
168 static int max8997_get_enable_register(struct regulator_dev *rdev,
169                 int *reg, int *mask, int *pattern)
170 {
171         int rid = rdev_get_id(rdev);
172
173         switch (rid) {
174         case MAX8997_LDO1 ... MAX8997_LDO21:
175                 *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
176                 *mask = 0xC0;
177                 *pattern = 0xC0;
178                 break;
179         case MAX8997_BUCK1:
180                 *reg = MAX8997_REG_BUCK1CTRL;
181                 *mask = 0x01;
182                 *pattern = 0x01;
183                 break;
184         case MAX8997_BUCK2:
185                 *reg = MAX8997_REG_BUCK2CTRL;
186                 *mask = 0x01;
187                 *pattern = 0x01;
188                 break;
189         case MAX8997_BUCK3:
190                 *reg = MAX8997_REG_BUCK3CTRL;
191                 *mask = 0x01;
192                 *pattern = 0x01;
193                 break;
194         case MAX8997_BUCK4:
195                 *reg = MAX8997_REG_BUCK4CTRL;
196                 *mask = 0x01;
197                 *pattern = 0x01;
198                 break;
199         case MAX8997_BUCK5:
200                 *reg = MAX8997_REG_BUCK5CTRL;
201                 *mask = 0x01;
202                 *pattern = 0x01;
203                 break;
204         case MAX8997_BUCK6:
205                 *reg = MAX8997_REG_BUCK6CTRL;
206                 *mask = 0x01;
207                 *pattern = 0x01;
208                 break;
209         case MAX8997_BUCK7:
210                 *reg = MAX8997_REG_BUCK7CTRL;
211                 *mask = 0x01;
212                 *pattern = 0x01;
213                 break;
214         case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP:
215                 *reg = MAX8997_REG_MAINCON1;
216                 *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP);
217                 *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP);
218                 break;
219         case MAX8997_ENVICHG:
220                 *reg = MAX8997_REG_MBCCTRL1;
221                 *mask = 0x80;
222                 *pattern = 0x80;
223                 break;
224         case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2:
225                 *reg = MAX8997_REG_SAFEOUTCTRL;
226                 *mask = 0x40 << (rid - MAX8997_ESAFEOUT1);
227                 *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1);
228                 break;
229         case MAX8997_CHARGER:
230                 *reg = MAX8997_REG_MBCCTRL2;
231                 *mask = 0x40;
232                 *pattern = 0x40;
233                 break;
234         default:
235                 /* Not controllable or not exists */
236                 return -EINVAL;
237         }
238
239         return 0;
240 }
241
242 static int max8997_reg_is_enabled(struct regulator_dev *rdev)
243 {
244         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
245         struct i2c_client *i2c = max8997->iodev->i2c;
246         int ret, reg, mask, pattern;
247         u8 val;
248
249         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
250         if (ret)
251                 return ret;
252
253         ret = max8997_read_reg(i2c, reg, &val);
254         if (ret)
255                 return ret;
256
257         return (val & mask) == pattern;
258 }
259
260 static int max8997_reg_enable(struct regulator_dev *rdev)
261 {
262         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
263         struct i2c_client *i2c = max8997->iodev->i2c;
264         int ret, reg, mask, pattern;
265
266         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
267         if (ret)
268                 return ret;
269
270         return max8997_update_reg(i2c, reg, pattern, mask);
271 }
272
273 static int max8997_reg_disable(struct regulator_dev *rdev)
274 {
275         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
276         struct i2c_client *i2c = max8997->iodev->i2c;
277         int ret, reg, mask, pattern;
278
279         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
280         if (ret)
281                 return ret;
282
283         return max8997_update_reg(i2c, reg, ~pattern, mask);
284 }
285
286 static int max8997_get_voltage_register(struct regulator_dev *rdev,
287                 int *_reg, int *_shift, int *_mask)
288 {
289         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
290         int rid = rdev_get_id(rdev);
291         int reg, shift = 0, mask = 0x3f;
292
293         switch (rid) {
294         case MAX8997_LDO1 ... MAX8997_LDO21:
295                 reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1);
296                 break;
297         case MAX8997_BUCK1:
298                 reg = MAX8997_REG_BUCK1DVS1;
299                 if (max8997->buck1_gpiodvs)
300                         reg += max8997->buck125_gpioindex;
301                 break;
302         case MAX8997_BUCK2:
303                 reg = MAX8997_REG_BUCK2DVS1;
304                 if (max8997->buck2_gpiodvs)
305                         reg += max8997->buck125_gpioindex;
306                 break;
307         case MAX8997_BUCK3:
308                 reg = MAX8997_REG_BUCK3DVS;
309                 break;
310         case MAX8997_BUCK4:
311                 reg = MAX8997_REG_BUCK4DVS;
312                 break;
313         case MAX8997_BUCK5:
314                 reg = MAX8997_REG_BUCK5DVS1;
315                 if (max8997->buck5_gpiodvs)
316                         reg += max8997->buck125_gpioindex;
317                 break;
318         case MAX8997_BUCK7:
319                 reg = MAX8997_REG_BUCK7DVS;
320                 break;
321         case MAX8997_ESAFEOUT1 ...  MAX8997_ESAFEOUT2:
322                 reg = MAX8997_REG_SAFEOUTCTRL;
323                 shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0;
324                 mask = 0x3;
325                 break;
326         case MAX8997_CHARGER_CV:
327                 reg = MAX8997_REG_MBCCTRL3;
328                 shift = 0;
329                 mask = 0xf;
330                 break;
331         case MAX8997_CHARGER:
332                 reg = MAX8997_REG_MBCCTRL4;
333                 shift = 0;
334                 mask = 0xf;
335                 break;
336         case MAX8997_CHARGER_TOPOFF:
337                 reg = MAX8997_REG_MBCCTRL5;
338                 shift = 0;
339                 mask = 0xf;
340                 break;
341         default:
342                 return -EINVAL;
343         }
344
345         *_reg = reg;
346         *_shift = shift;
347         *_mask = mask;
348
349         return 0;
350 }
351
352 static int max8997_get_voltage_sel(struct regulator_dev *rdev)
353 {
354         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
355         struct i2c_client *i2c = max8997->iodev->i2c;
356         int reg, shift, mask, ret;
357         u8 val;
358
359         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
360         if (ret)
361                 return ret;
362
363         ret = max8997_read_reg(i2c, reg, &val);
364         if (ret)
365                 return ret;
366
367         val >>= shift;
368         val &= mask;
369
370         return val;
371 }
372
373 static inline int max8997_get_voltage_proper_val(
374                 const struct voltage_map_desc *desc,
375                 int min_vol, int max_vol)
376 {
377         int i;
378
379         if (desc == NULL)
380                 return -EINVAL;
381
382         if (max_vol < desc->min || min_vol > desc->max)
383                 return -EINVAL;
384
385         if (min_vol < desc->min)
386                 min_vol = desc->min;
387
388         i = DIV_ROUND_UP(min_vol - desc->min, desc->step);
389
390         if (desc->min + desc->step * i > max_vol)
391                 return -EINVAL;
392
393         return i;
394 }
395
396 static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev,
397                 int min_uV, int max_uV, unsigned *selector)
398 {
399         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
400         struct i2c_client *i2c = max8997->iodev->i2c;
401         int rid = rdev_get_id(rdev);
402         int lb, ub;
403         int reg, shift = 0, mask, ret = 0;
404         u8 val = 0x0;
405
406         if (rid != MAX8997_CHARGER_CV)
407                 return -EINVAL;
408
409         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
410         if (ret)
411                 return ret;
412
413         if (max_uV < 4000000 || min_uV > 4350000)
414                 return -EINVAL;
415
416         if (min_uV <= 4000000)
417                 val = 0x1;
418         else if (min_uV <= 4200000 && max_uV >= 4200000)
419                 val = 0x0;
420         else {
421                 lb = (min_uV - 4000001) / 20000 + 2;
422                 ub = (max_uV - 4000000) / 20000 + 1;
423
424                 if (lb > ub)
425                         return -EINVAL;
426
427                 if (lb < 0xf)
428                         val = lb;
429                 else {
430                         if (ub >= 0xf)
431                                 val = 0xf;
432                         else
433                                 return -EINVAL;
434                 }
435         }
436
437         *selector = val;
438
439         ret = max8997_update_reg(i2c, reg, val << shift, mask);
440
441         return ret;
442 }
443
444 /*
445  * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF
446  * BUCK1, 2, and 5 are available if they are not controlled by gpio
447  */
448 static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
449                 int min_uV, int max_uV, unsigned *selector)
450 {
451         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
452         struct i2c_client *i2c = max8997->iodev->i2c;
453         const struct voltage_map_desc *desc;
454         int rid = rdev_get_id(rdev);
455         int i, reg, shift, mask, ret;
456
457         switch (rid) {
458         case MAX8997_LDO1 ... MAX8997_LDO21:
459                 break;
460         case MAX8997_BUCK1 ... MAX8997_BUCK5:
461                 break;
462         case MAX8997_BUCK6:
463                 return -EINVAL;
464         case MAX8997_BUCK7:
465                 break;
466         case MAX8997_CHARGER:
467                 break;
468         case MAX8997_CHARGER_TOPOFF:
469                 break;
470         default:
471                 return -EINVAL;
472         }
473
474         desc = reg_voltage_map[rid];
475
476         i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
477         if (i < 0)
478                 return i;
479
480         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
481         if (ret)
482                 return ret;
483
484         ret = max8997_update_reg(i2c, reg, i << shift, mask << shift);
485         *selector = i;
486
487         return ret;
488 }
489
490 static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev,
491                                                 unsigned int old_selector,
492                                                 unsigned int new_selector)
493 {
494         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
495         int rid = rdev_get_id(rdev);
496         const struct voltage_map_desc *desc = reg_voltage_map[rid];
497
498         /* Delay is required only if the voltage is increasing */
499         if (old_selector >= new_selector)
500                 return 0;
501
502         /* No need to delay if gpio_dvs_mode */
503         switch (rid) {
504         case MAX8997_BUCK1:
505                 if (max8997->buck1_gpiodvs)
506                         return 0;
507                 break;
508         case MAX8997_BUCK2:
509                 if (max8997->buck2_gpiodvs)
510                         return 0;
511                 break;
512         case MAX8997_BUCK5:
513                 if (max8997->buck5_gpiodvs)
514                         return 0;
515                 break;
516         }
517
518         switch (rid) {
519         case MAX8997_BUCK1:
520         case MAX8997_BUCK2:
521         case MAX8997_BUCK4:
522         case MAX8997_BUCK5:
523                 return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
524                                     max8997->ramp_delay * 1000);
525         }
526
527         return 0;
528 }
529
530 /*
531  * Assess the damage on the voltage setting of BUCK1,2,5 by the change.
532  *
533  * When GPIO-DVS mode is used for multiple bucks, changing the voltage value
534  * of one of the bucks may affect that of another buck, which is the side
535  * effect of the change (set_voltage). This function examines the GPIO-DVS
536  * configurations and checks whether such side-effect exists.
537  */
538 static int max8997_assess_side_effect(struct regulator_dev *rdev,
539                 u8 new_val, int *best)
540 {
541         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
542         int rid = rdev_get_id(rdev);
543         u8 *buckx_val[3];
544         bool buckx_gpiodvs[3];
545         int side_effect[8];
546         int min_side_effect = INT_MAX;
547         int i;
548
549         *best = -1;
550
551         switch (rid) {
552         case MAX8997_BUCK1:
553                 rid = 0;
554                 break;
555         case MAX8997_BUCK2:
556                 rid = 1;
557                 break;
558         case MAX8997_BUCK5:
559                 rid = 2;
560                 break;
561         default:
562                 return -EINVAL;
563         }
564
565         buckx_val[0] = max8997->buck1_vol;
566         buckx_val[1] = max8997->buck2_vol;
567         buckx_val[2] = max8997->buck5_vol;
568         buckx_gpiodvs[0] = max8997->buck1_gpiodvs;
569         buckx_gpiodvs[1] = max8997->buck2_gpiodvs;
570         buckx_gpiodvs[2] = max8997->buck5_gpiodvs;
571
572         for (i = 0; i < 8; i++) {
573                 int others;
574
575                 if (new_val != (buckx_val[rid])[i]) {
576                         side_effect[i] = -1;
577                         continue;
578                 }
579
580                 side_effect[i] = 0;
581                 for (others = 0; others < 3; others++) {
582                         int diff;
583
584                         if (others == rid)
585                                 continue;
586                         if (buckx_gpiodvs[others] == false)
587                                 continue; /* Not affected */
588                         diff = (buckx_val[others])[i] -
589                                 (buckx_val[others])[max8997->buck125_gpioindex];
590                         if (diff > 0)
591                                 side_effect[i] += diff;
592                         else if (diff < 0)
593                                 side_effect[i] -= diff;
594                 }
595                 if (side_effect[i] == 0) {
596                         *best = i;
597                         return 0; /* NO SIDE EFFECT! Use This! */
598                 }
599                 if (side_effect[i] < min_side_effect) {
600                         min_side_effect = side_effect[i];
601                         *best = i;
602                 }
603         }
604
605         if (*best == -1)
606                 return -EINVAL;
607
608         return side_effect[*best];
609 }
610
611 /*
612  * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls
613  * max8997_set_voltage_ldobuck to do the job.
614  */
615 static int max8997_set_voltage_buck(struct regulator_dev *rdev,
616                 int min_uV, int max_uV, unsigned *selector)
617 {
618         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
619         int rid = rdev_get_id(rdev);
620         const struct voltage_map_desc *desc;
621         int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
622         bool gpio_dvs_mode = false;
623
624         if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
625                 return -EINVAL;
626
627         switch (rid) {
628         case MAX8997_BUCK1:
629                 if (max8997->buck1_gpiodvs)
630                         gpio_dvs_mode = true;
631                 break;
632         case MAX8997_BUCK2:
633                 if (max8997->buck2_gpiodvs)
634                         gpio_dvs_mode = true;
635                 break;
636         case MAX8997_BUCK5:
637                 if (max8997->buck5_gpiodvs)
638                         gpio_dvs_mode = true;
639                 break;
640         }
641
642         if (!gpio_dvs_mode)
643                 return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV,
644                                                 selector);
645
646         desc = reg_voltage_map[rid];
647         new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
648         if (new_val < 0)
649                 return new_val;
650
651         tmp_dmg = INT_MAX;
652         tmp_idx = -1;
653         tmp_val = -1;
654         do {
655                 damage = max8997_assess_side_effect(rdev, new_val, &new_idx);
656                 if (damage == 0)
657                         goto out;
658
659                 if (tmp_dmg > damage) {
660                         tmp_idx = new_idx;
661                         tmp_val = new_val;
662                         tmp_dmg = damage;
663                 }
664
665                 new_val++;
666         } while (desc->min + desc->step * new_val <= desc->max);
667
668         new_idx = tmp_idx;
669         new_val = tmp_val;
670
671         if (max8997->ignore_gpiodvs_side_effect == false)
672                 return -EINVAL;
673
674         dev_warn(&rdev->dev,
675                 "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET:  %d -> %d\n",
676                 max8997->buck125_gpioindex, tmp_idx);
677
678 out:
679         if (new_idx < 0 || new_val < 0)
680                 return -EINVAL;
681
682         max8997->buck125_gpioindex = new_idx;
683         max8997_set_gpio(max8997);
684         *selector = new_val;
685
686         return 0;
687 }
688
689 /* For SAFEOUT1 and SAFEOUT2 */
690 static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev,
691                                            unsigned selector)
692 {
693         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
694         struct i2c_client *i2c = max8997->iodev->i2c;
695         int rid = rdev_get_id(rdev);
696         int reg, shift = 0, mask, ret;
697
698         if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2)
699                 return -EINVAL;
700
701         ret = max8997_get_voltage_register(rdev, &reg, &shift, &mask);
702         if (ret)
703                 return ret;
704
705         return max8997_update_reg(i2c, reg, selector << shift, mask << shift);
706 }
707
708 static int max8997_reg_disable_suspend(struct regulator_dev *rdev)
709 {
710         struct max8997_data *max8997 = rdev_get_drvdata(rdev);
711         struct i2c_client *i2c = max8997->iodev->i2c;
712         int ret, reg, mask, pattern;
713         int rid = rdev_get_id(rdev);
714
715         ret = max8997_get_enable_register(rdev, &reg, &mask, &pattern);
716         if (ret)
717                 return ret;
718
719         max8997_read_reg(i2c, reg, &max8997->saved_states[rid]);
720
721         if (rid == MAX8997_LDO1 ||
722                         rid == MAX8997_LDO10 ||
723                         rid == MAX8997_LDO21) {
724                 dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n",
725                                 rdev->desc->name);
726                 return max8997_update_reg(i2c, reg, 0x40, mask);
727         }
728
729         dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
730                         rdev->desc->name, max8997->saved_states[rid] & mask,
731                         (~pattern) & mask);
732         return max8997_update_reg(i2c, reg, ~pattern, mask);
733 }
734
735 static struct regulator_ops max8997_ldo_ops = {
736         .list_voltage           = max8997_list_voltage,
737         .is_enabled             = max8997_reg_is_enabled,
738         .enable                 = max8997_reg_enable,
739         .disable                = max8997_reg_disable,
740         .get_voltage_sel        = max8997_get_voltage_sel,
741         .set_voltage            = max8997_set_voltage_ldobuck,
742         .set_suspend_disable    = max8997_reg_disable_suspend,
743 };
744
745 static struct regulator_ops max8997_buck_ops = {
746         .list_voltage           = max8997_list_voltage,
747         .is_enabled             = max8997_reg_is_enabled,
748         .enable                 = max8997_reg_enable,
749         .disable                = max8997_reg_disable,
750         .get_voltage_sel        = max8997_get_voltage_sel,
751         .set_voltage            = max8997_set_voltage_buck,
752         .set_voltage_time_sel   = max8997_set_voltage_buck_time_sel,
753         .set_suspend_disable    = max8997_reg_disable_suspend,
754 };
755
756 static struct regulator_ops max8997_fixedvolt_ops = {
757         .list_voltage           = max8997_list_voltage,
758         .is_enabled             = max8997_reg_is_enabled,
759         .enable                 = max8997_reg_enable,
760         .disable                = max8997_reg_disable,
761         .set_suspend_disable    = max8997_reg_disable_suspend,
762 };
763
764 static struct regulator_ops max8997_safeout_ops = {
765         .list_voltage           = regulator_list_voltage_table,
766         .is_enabled             = max8997_reg_is_enabled,
767         .enable                 = max8997_reg_enable,
768         .disable                = max8997_reg_disable,
769         .get_voltage_sel        = max8997_get_voltage_sel,
770         .set_voltage_sel        = max8997_set_voltage_safeout_sel,
771         .set_suspend_disable    = max8997_reg_disable_suspend,
772 };
773
774 static struct regulator_ops max8997_fixedstate_ops = {
775         .list_voltage           = max8997_list_voltage_charger_cv,
776         .get_voltage_sel        = max8997_get_voltage_sel,
777         .set_voltage            = max8997_set_voltage_charger_cv,
778 };
779
780 static int max8997_set_current_limit(struct regulator_dev *rdev,
781                                      int min_uA, int max_uA)
782 {
783         unsigned dummy;
784         int rid = rdev_get_id(rdev);
785
786         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
787                 return -EINVAL;
788
789         /* Reuse max8997_set_voltage_ldobuck to set current_limit. */
790         return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy);
791 }
792
793 static int max8997_get_current_limit(struct regulator_dev *rdev)
794 {
795         int sel, rid = rdev_get_id(rdev);
796
797         if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF)
798                 return -EINVAL;
799
800         sel = max8997_get_voltage_sel(rdev);
801         if (sel < 0)
802                 return sel;
803
804         /* Reuse max8997_list_voltage to get current_limit. */
805         return max8997_list_voltage(rdev, sel);
806 }
807
808 static struct regulator_ops max8997_charger_ops = {
809         .is_enabled             = max8997_reg_is_enabled,
810         .enable                 = max8997_reg_enable,
811         .disable                = max8997_reg_disable,
812         .get_current_limit      = max8997_get_current_limit,
813         .set_current_limit      = max8997_set_current_limit,
814 };
815
816 static struct regulator_ops max8997_charger_fixedstate_ops = {
817         .get_current_limit      = max8997_get_current_limit,
818         .set_current_limit      = max8997_set_current_limit,
819 };
820
821 #define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\
822         .name           = #_name,               \
823         .id             = MAX8997_##_name,      \
824         .ops            = &_ops,                \
825         .type           = REGULATOR_VOLTAGE,    \
826         .owner          = THIS_MODULE,          \
827 }
828
829 #define MAX8997_CURRENT_REGULATOR(_name, _ops) {\
830         .name           = #_name,               \
831         .id             = MAX8997_##_name,      \
832         .ops            = &_ops,                \
833         .type           = REGULATOR_CURRENT,    \
834         .owner          = THIS_MODULE,          \
835 }
836
837 static struct regulator_desc regulators[] = {
838         MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops),
839         MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops),
840         MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops),
841         MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops),
842         MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops),
843         MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops),
844         MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops),
845         MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops),
846         MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops),
847         MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops),
848         MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops),
849         MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops),
850         MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops),
851         MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops),
852         MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops),
853         MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops),
854         MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops),
855         MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops),
856         MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops),
857         MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops),
858         MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops),
859         MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops),
860         MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops),
861         MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops),
862         MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops),
863         MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops),
864         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops),
865         MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops),
866         MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops),
867         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops),
868         MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops),
869         MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops),
870         MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops),
871         MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF,
872                                   max8997_charger_fixedstate_ops),
873 };
874
875 #ifdef CONFIG_OF
876 static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev,
877                         struct max8997_platform_data *pdata,
878                         struct device_node *pmic_np)
879 {
880         int i, gpio;
881
882         for (i = 0; i < 3; i++) {
883                 gpio = of_get_named_gpio(pmic_np,
884                                         "max8997,pmic-buck125-dvs-gpios", i);
885                 if (!gpio_is_valid(gpio)) {
886                         dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio);
887                         return -EINVAL;
888                 }
889                 pdata->buck125_gpios[i] = gpio;
890         }
891         return 0;
892 }
893
894 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
895                                         struct max8997_platform_data *pdata)
896 {
897         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
898         struct device_node *pmic_np, *regulators_np, *reg_np;
899         struct max8997_regulator_data *rdata;
900         unsigned int i, dvs_voltage_nr = 1, ret;
901
902         pmic_np = iodev->dev->of_node;
903         if (!pmic_np) {
904                 dev_err(&pdev->dev, "could not find pmic sub-node\n");
905                 return -ENODEV;
906         }
907
908         regulators_np = of_get_child_by_name(pmic_np, "regulators");
909         if (!regulators_np) {
910                 dev_err(&pdev->dev, "could not find regulators sub-node\n");
911                 return -EINVAL;
912         }
913
914         /* count the number of regulators to be supported in pmic */
915         pdata->num_regulators = of_get_child_count(regulators_np);
916
917         rdata = devm_kcalloc(&pdev->dev,
918                              pdata->num_regulators, sizeof(*rdata),
919                              GFP_KERNEL);
920         if (!rdata) {
921                 of_node_put(regulators_np);
922                 return -ENOMEM;
923         }
924
925         pdata->regulators = rdata;
926         for_each_child_of_node(regulators_np, reg_np) {
927                 for (i = 0; i < ARRAY_SIZE(regulators); i++)
928                         if (of_node_name_eq(reg_np, regulators[i].name))
929                                 break;
930
931                 if (i == ARRAY_SIZE(regulators)) {
932                         dev_warn(&pdev->dev, "don't know how to configure regulator %pOFn\n",
933                                  reg_np);
934                         continue;
935                 }
936
937                 rdata->id = i;
938                 rdata->initdata = of_get_regulator_init_data(&pdev->dev,
939                                                              reg_np,
940                                                              &regulators[i]);
941                 rdata->reg_node = reg_np;
942                 rdata++;
943         }
944         of_node_put(regulators_np);
945
946         if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
947                 pdata->buck1_gpiodvs = true;
948
949         if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
950                 pdata->buck2_gpiodvs = true;
951
952         if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
953                 pdata->buck5_gpiodvs = true;
954
955         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
956                                                 pdata->buck5_gpiodvs) {
957                 ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np);
958                 if (ret)
959                         return -EINVAL;
960
961                 if (of_property_read_u32(pmic_np,
962                                 "max8997,pmic-buck125-default-dvs-idx",
963                                 &pdata->buck125_default_idx)) {
964                         pdata->buck125_default_idx = 0;
965                 } else {
966                         if (pdata->buck125_default_idx >= 8) {
967                                 pdata->buck125_default_idx = 0;
968                                 dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n");
969                         }
970                 }
971
972                 if (of_get_property(pmic_np,
973                         "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
974                         pdata->ignore_gpiodvs_side_effect = true;
975
976                 dvs_voltage_nr = 8;
977         }
978
979         if (of_property_read_u32_array(pmic_np,
980                                 "max8997,pmic-buck1-dvs-voltage",
981                                 pdata->buck1_voltage, dvs_voltage_nr)) {
982                 dev_err(&pdev->dev, "buck1 voltages not specified\n");
983                 return -EINVAL;
984         }
985
986         if (of_property_read_u32_array(pmic_np,
987                                 "max8997,pmic-buck2-dvs-voltage",
988                                 pdata->buck2_voltage, dvs_voltage_nr)) {
989                 dev_err(&pdev->dev, "buck2 voltages not specified\n");
990                 return -EINVAL;
991         }
992
993         if (of_property_read_u32_array(pmic_np,
994                                 "max8997,pmic-buck5-dvs-voltage",
995                                 pdata->buck5_voltage, dvs_voltage_nr)) {
996                 dev_err(&pdev->dev, "buck5 voltages not specified\n");
997                 return -EINVAL;
998         }
999
1000         return 0;
1001 }
1002 #else
1003 static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
1004                                         struct max8997_platform_data *pdata)
1005 {
1006         return 0;
1007 }
1008 #endif /* CONFIG_OF */
1009
1010 static int max8997_pmic_probe(struct platform_device *pdev)
1011 {
1012         struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
1013         struct max8997_platform_data *pdata = iodev->pdata;
1014         struct regulator_config config = { };
1015         struct regulator_dev *rdev;
1016         struct max8997_data *max8997;
1017         struct i2c_client *i2c;
1018         int i, ret, nr_dvs;
1019         u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
1020
1021         if (!pdata) {
1022                 dev_err(&pdev->dev, "No platform init data supplied.\n");
1023                 return -ENODEV;
1024         }
1025
1026         if (iodev->dev->of_node) {
1027                 ret = max8997_pmic_dt_parse_pdata(pdev, pdata);
1028                 if (ret)
1029                         return ret;
1030         }
1031
1032         max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
1033                                GFP_KERNEL);
1034         if (!max8997)
1035                 return -ENOMEM;
1036
1037         max8997->dev = &pdev->dev;
1038         max8997->iodev = iodev;
1039         max8997->num_regulators = pdata->num_regulators;
1040         platform_set_drvdata(pdev, max8997);
1041         i2c = max8997->iodev->i2c;
1042
1043         max8997->buck125_gpioindex = pdata->buck125_default_idx;
1044         max8997->buck1_gpiodvs = pdata->buck1_gpiodvs;
1045         max8997->buck2_gpiodvs = pdata->buck2_gpiodvs;
1046         max8997->buck5_gpiodvs = pdata->buck5_gpiodvs;
1047         memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3);
1048         max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect;
1049
1050         nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1051                         pdata->buck5_gpiodvs) ? 8 : 1;
1052
1053         for (i = 0; i < nr_dvs; i++) {
1054                 max8997->buck1_vol[i] = ret =
1055                         max8997_get_voltage_proper_val(
1056                                         &buck1245_voltage_map_desc,
1057                                         pdata->buck1_voltage[i],
1058                                         pdata->buck1_voltage[i] +
1059                                         buck1245_voltage_map_desc.step);
1060                 if (ret < 0)
1061                         return ret;
1062
1063                 max8997->buck2_vol[i] = ret =
1064                         max8997_get_voltage_proper_val(
1065                                         &buck1245_voltage_map_desc,
1066                                         pdata->buck2_voltage[i],
1067                                         pdata->buck2_voltage[i] +
1068                                         buck1245_voltage_map_desc.step);
1069                 if (ret < 0)
1070                         return ret;
1071
1072                 max8997->buck5_vol[i] = ret =
1073                         max8997_get_voltage_proper_val(
1074                                         &buck1245_voltage_map_desc,
1075                                         pdata->buck5_voltage[i],
1076                                         pdata->buck5_voltage[i] +
1077                                         buck1245_voltage_map_desc.step);
1078                 if (ret < 0)
1079                         return ret;
1080
1081                 if (max_buck1 < max8997->buck1_vol[i])
1082                         max_buck1 = max8997->buck1_vol[i];
1083                 if (max_buck2 < max8997->buck2_vol[i])
1084                         max_buck2 = max8997->buck2_vol[i];
1085                 if (max_buck5 < max8997->buck5_vol[i])
1086                         max_buck5 = max8997->buck5_vol[i];
1087         }
1088
1089         /* For the safety, set max voltage before setting up */
1090         for (i = 0; i < 8; i++) {
1091                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1092                                 max_buck1, 0x3f);
1093                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1094                                 max_buck2, 0x3f);
1095                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1096                                 max_buck5, 0x3f);
1097         }
1098
1099         /* Initialize all the DVS related BUCK registers */
1100         for (i = 0; i < nr_dvs; i++) {
1101                 max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i,
1102                                 max8997->buck1_vol[i],
1103                                 0x3f);
1104                 max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i,
1105                                 max8997->buck2_vol[i],
1106                                 0x3f);
1107                 max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i,
1108                                 max8997->buck5_vol[i],
1109                                 0x3f);
1110         }
1111
1112         /*
1113          * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them.
1114          * If at least one of them cares, set gpios.
1115          */
1116         if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
1117                         pdata->buck5_gpiodvs) {
1118
1119                 if (!gpio_is_valid(pdata->buck125_gpios[0]) ||
1120                                 !gpio_is_valid(pdata->buck125_gpios[1]) ||
1121                                 !gpio_is_valid(pdata->buck125_gpios[2])) {
1122                         dev_err(&pdev->dev, "GPIO NOT VALID\n");
1123                         return -EINVAL;
1124                 }
1125
1126                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0],
1127                                         "MAX8997 SET1");
1128                 if (ret)
1129                         return ret;
1130
1131                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1],
1132                                         "MAX8997 SET2");
1133                 if (ret)
1134                         return ret;
1135
1136                 ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2],
1137                                 "MAX8997 SET3");
1138                 if (ret)
1139                         return ret;
1140
1141                 gpio_direction_output(pdata->buck125_gpios[0],
1142                                 (max8997->buck125_gpioindex >> 2)
1143                                 & 0x1); /* SET1 */
1144                 gpio_direction_output(pdata->buck125_gpios[1],
1145                                 (max8997->buck125_gpioindex >> 1)
1146                                 & 0x1); /* SET2 */
1147                 gpio_direction_output(pdata->buck125_gpios[2],
1148                                 (max8997->buck125_gpioindex >> 0)
1149                                 & 0x1); /* SET3 */
1150         }
1151
1152         /* DVS-GPIO disabled */
1153         max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ?
1154                         (1 << 1) : (0 << 1), 1 << 1);
1155         max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ?
1156                         (1 << 1) : (0 << 1), 1 << 1);
1157         max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ?
1158                         (1 << 1) : (0 << 1), 1 << 1);
1159
1160         /* Misc Settings */
1161         max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
1162         max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
1163
1164         for (i = 0; i < pdata->num_regulators; i++) {
1165                 const struct voltage_map_desc *desc;
1166                 int id = pdata->regulators[i].id;
1167
1168                 desc = reg_voltage_map[id];
1169                 if (desc) {
1170                         regulators[id].n_voltages =
1171                                 (desc->max - desc->min) / desc->step + 1;
1172                 } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) {
1173                         regulators[id].volt_table = safeoutvolt;
1174                         regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt);
1175                 } else if (id == MAX8997_CHARGER_CV) {
1176                         regulators[id].n_voltages = 16;
1177                 }
1178
1179                 config.dev = max8997->dev;
1180                 config.init_data = pdata->regulators[i].initdata;
1181                 config.driver_data = max8997;
1182                 config.of_node = pdata->regulators[i].reg_node;
1183
1184                 rdev = devm_regulator_register(&pdev->dev, &regulators[id],
1185                                                &config);
1186                 if (IS_ERR(rdev)) {
1187                         dev_err(max8997->dev, "regulator init failed for %d\n",
1188                                         id);
1189                         return PTR_ERR(rdev);
1190                 }
1191         }
1192
1193         return 0;
1194 }
1195
1196 static const struct platform_device_id max8997_pmic_id[] = {
1197         { "max8997-pmic", 0},
1198         { },
1199 };
1200 MODULE_DEVICE_TABLE(platform, max8997_pmic_id);
1201
1202 static struct platform_driver max8997_pmic_driver = {
1203         .driver = {
1204                 .name = "max8997-pmic",
1205         },
1206         .probe = max8997_pmic_probe,
1207         .id_table = max8997_pmic_id,
1208 };
1209
1210 static int __init max8997_pmic_init(void)
1211 {
1212         return platform_driver_register(&max8997_pmic_driver);
1213 }
1214 subsys_initcall(max8997_pmic_init);
1215
1216 static void __exit max8997_pmic_cleanup(void)
1217 {
1218         platform_driver_unregister(&max8997_pmic_driver);
1219 }
1220 module_exit(max8997_pmic_cleanup);
1221
1222 MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver");
1223 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
1224 MODULE_LICENSE("GPL");