1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/bug.h>
3 #include <linux/kernel.h>
4 #include <linux/bitops.h>
5 #include <linux/math64.h>
6 #include <linux/log2.h>
7 #include <linux/err.h>
8 #include <linux/module.h>
9 #include <linux/units.h>
10 
11 #include "qcom-vadc-common.h"
12 
13 /* Voltage to temperature */
14 static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
15 	{1758,	-40},
16 	{1742,	-35},
17 	{1719,	-30},
18 	{1691,	-25},
19 	{1654,	-20},
20 	{1608,	-15},
21 	{1551,	-10},
22 	{1483,	-5},
23 	{1404,	0},
24 	{1315,	5},
25 	{1218,	10},
26 	{1114,	15},
27 	{1007,	20},
28 	{900,	25},
29 	{795,	30},
30 	{696,	35},
31 	{605,	40},
32 	{522,	45},
33 	{448,	50},
34 	{383,	55},
35 	{327,	60},
36 	{278,	65},
37 	{237,	70},
38 	{202,	75},
39 	{172,	80},
40 	{146,	85},
41 	{125,	90},
42 	{107,	95},
43 	{92,	100},
44 	{79,	105},
45 	{68,	110},
46 	{59,	115},
47 	{51,	120},
48 	{44,	125}
49 };
50 
51 /*
52  * Voltage to temperature table for 100k pull up for NTCG104EF104 with
53  * 1.875V reference.
54  */
55 static const struct vadc_map_pt adcmap_100k_104ef_104fb_1875_vref[] = {
56 	{ 1831,	-40000 },
57 	{ 1814,	-35000 },
58 	{ 1791,	-30000 },
59 	{ 1761,	-25000 },
60 	{ 1723,	-20000 },
61 	{ 1675,	-15000 },
62 	{ 1616,	-10000 },
63 	{ 1545,	-5000 },
64 	{ 1463,	0 },
65 	{ 1370,	5000 },
66 	{ 1268,	10000 },
67 	{ 1160,	15000 },
68 	{ 1049,	20000 },
69 	{ 937,	25000 },
70 	{ 828,	30000 },
71 	{ 726,	35000 },
72 	{ 630,	40000 },
73 	{ 544,	45000 },
74 	{ 467,	50000 },
75 	{ 399,	55000 },
76 	{ 340,	60000 },
77 	{ 290,	65000 },
78 	{ 247,	70000 },
79 	{ 209,	75000 },
80 	{ 179,	80000 },
81 	{ 153,	85000 },
82 	{ 130,	90000 },
83 	{ 112,	95000 },
84 	{ 96,	100000 },
85 	{ 82,	105000 },
86 	{ 71,	110000 },
87 	{ 62,	115000 },
88 	{ 53,	120000 },
89 	{ 46,	125000 },
90 };
91 
92 static const struct vadc_map_pt adcmap7_die_temp[] = {
93 	{ 433700, 1967},
94 	{ 473100, 1964},
95 	{ 512400, 1957},
96 	{ 551500, 1949},
97 	{ 590500, 1940},
98 	{ 629300, 1930},
99 	{ 667900, 1921},
100 	{ 706400, 1910},
101 	{ 744600, 1896},
102 	{ 782500, 1878},
103 	{ 820100, 1859},
104 	{ 857300, 0},
105 };
106 
107 /*
108  * Resistance to temperature table for 100k pull up for NTCG104EF104.
109  */
110 static const struct vadc_map_pt adcmap7_100k[] = {
111 	{ 4250657, -40960 },
112 	{ 3962085, -39936 },
113 	{ 3694875, -38912 },
114 	{ 3447322, -37888 },
115 	{ 3217867, -36864 },
116 	{ 3005082, -35840 },
117 	{ 2807660, -34816 },
118 	{ 2624405, -33792 },
119 	{ 2454218, -32768 },
120 	{ 2296094, -31744 },
121 	{ 2149108, -30720 },
122 	{ 2012414, -29696 },
123 	{ 1885232, -28672 },
124 	{ 1766846, -27648 },
125 	{ 1656598, -26624 },
126 	{ 1553884, -25600 },
127 	{ 1458147, -24576 },
128 	{ 1368873, -23552 },
129 	{ 1285590, -22528 },
130 	{ 1207863, -21504 },
131 	{ 1135290, -20480 },
132 	{ 1067501, -19456 },
133 	{ 1004155, -18432 },
134 	{ 944935, -17408 },
135 	{ 889550, -16384 },
136 	{ 837731, -15360 },
137 	{ 789229, -14336 },
138 	{ 743813, -13312 },
139 	{ 701271, -12288 },
140 	{ 661405, -11264 },
141 	{ 624032, -10240 },
142 	{ 588982, -9216 },
143 	{ 556100, -8192 },
144 	{ 525239, -7168 },
145 	{ 496264, -6144 },
146 	{ 469050, -5120 },
147 	{ 443480, -4096 },
148 	{ 419448, -3072 },
149 	{ 396851, -2048 },
150 	{ 375597, -1024 },
151 	{ 355598, 0 },
152 	{ 336775, 1024 },
153 	{ 319052, 2048 },
154 	{ 302359, 3072 },
155 	{ 286630, 4096 },
156 	{ 271806, 5120 },
157 	{ 257829, 6144 },
158 	{ 244646, 7168 },
159 	{ 232209, 8192 },
160 	{ 220471, 9216 },
161 	{ 209390, 10240 },
162 	{ 198926, 11264 },
163 	{ 189040, 12288 },
164 	{ 179698, 13312 },
165 	{ 170868, 14336 },
166 	{ 162519, 15360 },
167 	{ 154622, 16384 },
168 	{ 147150, 17408 },
169 	{ 140079, 18432 },
170 	{ 133385, 19456 },
171 	{ 127046, 20480 },
172 	{ 121042, 21504 },
173 	{ 115352, 22528 },
174 	{ 109960, 23552 },
175 	{ 104848, 24576 },
176 	{ 100000, 25600 },
177 	{ 95402, 26624 },
178 	{ 91038, 27648 },
179 	{ 86897, 28672 },
180 	{ 82965, 29696 },
181 	{ 79232, 30720 },
182 	{ 75686, 31744 },
183 	{ 72316, 32768 },
184 	{ 69114, 33792 },
185 	{ 66070, 34816 },
186 	{ 63176, 35840 },
187 	{ 60423, 36864 },
188 	{ 57804, 37888 },
189 	{ 55312, 38912 },
190 	{ 52940, 39936 },
191 	{ 50681, 40960 },
192 	{ 48531, 41984 },
193 	{ 46482, 43008 },
194 	{ 44530, 44032 },
195 	{ 42670, 45056 },
196 	{ 40897, 46080 },
197 	{ 39207, 47104 },
198 	{ 37595, 48128 },
199 	{ 36057, 49152 },
200 	{ 34590, 50176 },
201 	{ 33190, 51200 },
202 	{ 31853, 52224 },
203 	{ 30577, 53248 },
204 	{ 29358, 54272 },
205 	{ 28194, 55296 },
206 	{ 27082, 56320 },
207 	{ 26020, 57344 },
208 	{ 25004, 58368 },
209 	{ 24033, 59392 },
210 	{ 23104, 60416 },
211 	{ 22216, 61440 },
212 	{ 21367, 62464 },
213 	{ 20554, 63488 },
214 	{ 19776, 64512 },
215 	{ 19031, 65536 },
216 	{ 18318, 66560 },
217 	{ 17636, 67584 },
218 	{ 16982, 68608 },
219 	{ 16355, 69632 },
220 	{ 15755, 70656 },
221 	{ 15180, 71680 },
222 	{ 14628, 72704 },
223 	{ 14099, 73728 },
224 	{ 13592, 74752 },
225 	{ 13106, 75776 },
226 	{ 12640, 76800 },
227 	{ 12192, 77824 },
228 	{ 11762, 78848 },
229 	{ 11350, 79872 },
230 	{ 10954, 80896 },
231 	{ 10574, 81920 },
232 	{ 10209, 82944 },
233 	{ 9858, 83968 },
234 	{ 9521, 84992 },
235 	{ 9197, 86016 },
236 	{ 8886, 87040 },
237 	{ 8587, 88064 },
238 	{ 8299, 89088 },
239 	{ 8023, 90112 },
240 	{ 7757, 91136 },
241 	{ 7501, 92160 },
242 	{ 7254, 93184 },
243 	{ 7017, 94208 },
244 	{ 6789, 95232 },
245 	{ 6570, 96256 },
246 	{ 6358, 97280 },
247 	{ 6155, 98304 },
248 	{ 5959, 99328 },
249 	{ 5770, 100352 },
250 	{ 5588, 101376 },
251 	{ 5412, 102400 },
252 	{ 5243, 103424 },
253 	{ 5080, 104448 },
254 	{ 4923, 105472 },
255 	{ 4771, 106496 },
256 	{ 4625, 107520 },
257 	{ 4484, 108544 },
258 	{ 4348, 109568 },
259 	{ 4217, 110592 },
260 	{ 4090, 111616 },
261 	{ 3968, 112640 },
262 	{ 3850, 113664 },
263 	{ 3736, 114688 },
264 	{ 3626, 115712 },
265 	{ 3519, 116736 },
266 	{ 3417, 117760 },
267 	{ 3317, 118784 },
268 	{ 3221, 119808 },
269 	{ 3129, 120832 },
270 	{ 3039, 121856 },
271 	{ 2952, 122880 },
272 	{ 2868, 123904 },
273 	{ 2787, 124928 },
274 	{ 2709, 125952 },
275 	{ 2633, 126976 },
276 	{ 2560, 128000 },
277 	{ 2489, 129024 },
278 	{ 2420, 130048 }
279 };
280 
281 static int qcom_vadc_scale_hw_calib_volt(
282 				const struct vadc_prescale_ratio *prescale,
283 				const struct adc5_data *data,
284 				u16 adc_code, int *result_uv);
285 static int qcom_vadc_scale_hw_calib_therm(
286 				const struct vadc_prescale_ratio *prescale,
287 				const struct adc5_data *data,
288 				u16 adc_code, int *result_mdec);
289 static int qcom_vadc7_scale_hw_calib_therm(
290 				const struct vadc_prescale_ratio *prescale,
291 				const struct adc5_data *data,
292 				u16 adc_code, int *result_mdec);
293 static int qcom_vadc_scale_hw_smb_temp(
294 				const struct vadc_prescale_ratio *prescale,
295 				const struct adc5_data *data,
296 				u16 adc_code, int *result_mdec);
297 static int qcom_vadc_scale_hw_chg5_temp(
298 				const struct vadc_prescale_ratio *prescale,
299 				const struct adc5_data *data,
300 				u16 adc_code, int *result_mdec);
301 static int qcom_vadc_scale_hw_calib_die_temp(
302 				const struct vadc_prescale_ratio *prescale,
303 				const struct adc5_data *data,
304 				u16 adc_code, int *result_mdec);
305 static int qcom_vadc7_scale_hw_calib_die_temp(
306 				const struct vadc_prescale_ratio *prescale,
307 				const struct adc5_data *data,
308 				u16 adc_code, int *result_mdec);
309 
310 static struct qcom_adc5_scale_type scale_adc5_fn[] = {
311 	[SCALE_HW_CALIB_DEFAULT] = {qcom_vadc_scale_hw_calib_volt},
312 	[SCALE_HW_CALIB_THERM_100K_PULLUP] = {qcom_vadc_scale_hw_calib_therm},
313 	[SCALE_HW_CALIB_XOTHERM] = {qcom_vadc_scale_hw_calib_therm},
314 	[SCALE_HW_CALIB_THERM_100K_PU_PM7] = {
315 					qcom_vadc7_scale_hw_calib_therm},
316 	[SCALE_HW_CALIB_PMIC_THERM] = {qcom_vadc_scale_hw_calib_die_temp},
317 	[SCALE_HW_CALIB_PMIC_THERM_PM7] = {
318 					qcom_vadc7_scale_hw_calib_die_temp},
319 	[SCALE_HW_CALIB_PM5_CHG_TEMP] = {qcom_vadc_scale_hw_chg5_temp},
320 	[SCALE_HW_CALIB_PM5_SMB_TEMP] = {qcom_vadc_scale_hw_smb_temp},
321 };
322 
323 static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,
324 				      u32 tablesize, s32 input, int *output)
325 {
326 	bool descending = 1;
327 	u32 i = 0;
328 
329 	if (!pts)
330 		return -EINVAL;
331 
332 	/* Check if table is descending or ascending */
333 	if (tablesize > 1) {
334 		if (pts[0].x < pts[1].x)
335 			descending = 0;
336 	}
337 
338 	while (i < tablesize) {
339 		if ((descending) && (pts[i].x < input)) {
340 			/* table entry is less than measured*/
341 			 /* value and table is descending, stop */
342 			break;
343 		} else if ((!descending) &&
344 				(pts[i].x > input)) {
345 			/* table entry is greater than measured*/
346 			/*value and table is ascending, stop */
347 			break;
348 		}
349 		i++;
350 	}
351 
352 	if (i == 0) {
353 		*output = pts[0].y;
354 	} else if (i == tablesize) {
355 		*output = pts[tablesize - 1].y;
356 	} else {
357 		/* result is between search_index and search_index-1 */
358 		/* interpolate linearly */
359 		*output = (((s32)((pts[i].y - pts[i - 1].y) *
360 			(input - pts[i - 1].x)) /
361 			(pts[i].x - pts[i - 1].x)) +
362 			pts[i - 1].y);
363 	}
364 
365 	return 0;
366 }
367 
368 static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph,
369 				  u16 adc_code,
370 				  bool absolute,
371 				  s64 *scale_voltage)
372 {
373 	*scale_voltage = (adc_code - calib_graph->gnd);
374 	*scale_voltage *= calib_graph->dx;
375 	*scale_voltage = div64_s64(*scale_voltage, calib_graph->dy);
376 	if (absolute)
377 		*scale_voltage += calib_graph->dx;
378 
379 	if (*scale_voltage < 0)
380 		*scale_voltage = 0;
381 }
382 
383 static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph,
384 				const struct vadc_prescale_ratio *prescale,
385 				bool absolute, u16 adc_code,
386 				int *result_uv)
387 {
388 	s64 voltage = 0, result = 0;
389 
390 	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
391 
392 	voltage = voltage * prescale->den;
393 	result = div64_s64(voltage, prescale->num);
394 	*result_uv = result;
395 
396 	return 0;
397 }
398 
399 static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
400 				 const struct vadc_prescale_ratio *prescale,
401 				 bool absolute, u16 adc_code,
402 				 int *result_mdec)
403 {
404 	s64 voltage = 0;
405 	int ret;
406 
407 	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
408 
409 	if (absolute)
410 		voltage = div64_s64(voltage, 1000);
411 
412 	ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb,
413 					 ARRAY_SIZE(adcmap_100k_104ef_104fb),
414 					 voltage, result_mdec);
415 	if (ret)
416 		return ret;
417 
418 	*result_mdec *= 1000;
419 
420 	return 0;
421 }
422 
423 static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,
424 				    const struct vadc_prescale_ratio *prescale,
425 				    bool absolute,
426 				    u16 adc_code, int *result_mdec)
427 {
428 	s64 voltage = 0;
429 	u64 temp; /* Temporary variable for do_div */
430 
431 	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
432 
433 	if (voltage > 0) {
434 		temp = voltage * prescale->den;
435 		do_div(temp, prescale->num * 2);
436 		voltage = temp;
437 	} else {
438 		voltage = 0;
439 	}
440 
441 	*result_mdec = milli_kelvin_to_millicelsius(voltage);
442 
443 	return 0;
444 }
445 
446 static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
447 				    const struct vadc_prescale_ratio *prescale,
448 				    bool absolute,
449 				    u16 adc_code, int *result_mdec)
450 {
451 	s64 voltage = 0, result = 0;
452 
453 	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
454 
455 	voltage = voltage * prescale->den;
456 	voltage = div64_s64(voltage, prescale->num);
457 	voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));
458 	voltage = (voltage + PMI_CHG_SCALE_2);
459 	result =  div64_s64(voltage, 1000000);
460 	*result_mdec = result;
461 
462 	return 0;
463 }
464 
465 static int qcom_vadc_scale_code_voltage_factor(u16 adc_code,
466 				const struct vadc_prescale_ratio *prescale,
467 				const struct adc5_data *data,
468 				unsigned int factor)
469 {
470 	s64 voltage, temp, adc_vdd_ref_mv = 1875;
471 
472 	/*
473 	 * The normal data range is between 0V to 1.875V. On cases where
474 	 * we read low voltage values, the ADC code can go beyond the
475 	 * range and the scale result is incorrect so we clamp the values
476 	 * for the cases where the code represents a value below 0V
477 	 */
478 	if (adc_code > VADC5_MAX_CODE)
479 		adc_code = 0;
480 
481 	/* (ADC code * vref_vadc (1.875V)) / full_scale_code */
482 	voltage = (s64) adc_code * adc_vdd_ref_mv * 1000;
483 	voltage = div64_s64(voltage, data->full_scale_code_volt);
484 	if (voltage > 0) {
485 		voltage *= prescale->den;
486 		temp = prescale->num * factor;
487 		voltage = div64_s64(voltage, temp);
488 	} else {
489 		voltage = 0;
490 	}
491 
492 	return (int) voltage;
493 }
494 
495 static int qcom_vadc7_scale_hw_calib_therm(
496 				const struct vadc_prescale_ratio *prescale,
497 				const struct adc5_data *data,
498 				u16 adc_code, int *result_mdec)
499 {
500 	s64 resistance = adc_code;
501 	int ret, result;
502 
503 	if (adc_code >= RATIO_MAX_ADC7)
504 		return -EINVAL;
505 
506 	/* (ADC code * R_PULLUP (100Kohm)) / (full_scale_code - ADC code)*/
507 	resistance *= R_PU_100K;
508 	resistance = div64_s64(resistance, RATIO_MAX_ADC7 - adc_code);
509 
510 	ret = qcom_vadc_map_voltage_temp(adcmap7_100k,
511 				 ARRAY_SIZE(adcmap7_100k),
512 				 resistance, &result);
513 	if (ret)
514 		return ret;
515 
516 	*result_mdec = result;
517 
518 	return 0;
519 }
520 
521 static int qcom_vadc_scale_hw_calib_volt(
522 				const struct vadc_prescale_ratio *prescale,
523 				const struct adc5_data *data,
524 				u16 adc_code, int *result_uv)
525 {
526 	*result_uv = qcom_vadc_scale_code_voltage_factor(adc_code,
527 				prescale, data, 1);
528 
529 	return 0;
530 }
531 
532 static int qcom_vadc_scale_hw_calib_therm(
533 				const struct vadc_prescale_ratio *prescale,
534 				const struct adc5_data *data,
535 				u16 adc_code, int *result_mdec)
536 {
537 	int voltage;
538 
539 	voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
540 				prescale, data, 1000);
541 
542 	/* Map voltage to temperature from look-up table */
543 	return qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb_1875_vref,
544 				 ARRAY_SIZE(adcmap_100k_104ef_104fb_1875_vref),
545 				 voltage, result_mdec);
546 }
547 
548 static int qcom_vadc_scale_hw_calib_die_temp(
549 				const struct vadc_prescale_ratio *prescale,
550 				const struct adc5_data *data,
551 				u16 adc_code, int *result_mdec)
552 {
553 	*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
554 				prescale, data, 2);
555 	*result_mdec = milli_kelvin_to_millicelsius(*result_mdec);
556 
557 	return 0;
558 }
559 
560 static int qcom_vadc7_scale_hw_calib_die_temp(
561 				const struct vadc_prescale_ratio *prescale,
562 				const struct adc5_data *data,
563 				u16 adc_code, int *result_mdec)
564 {
565 
566 	int voltage, vtemp0, temp, i;
567 
568 	voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
569 				prescale, data, 1);
570 
571 	if (adcmap7_die_temp[0].x > voltage) {
572 		*result_mdec = DIE_TEMP_ADC7_SCALE_1;
573 		return 0;
574 	}
575 
576 	if (adcmap7_die_temp[ARRAY_SIZE(adcmap7_die_temp) - 1].x <= voltage) {
577 		*result_mdec = DIE_TEMP_ADC7_MAX;
578 		return 0;
579 	}
580 
581 	for (i = 0; i < ARRAY_SIZE(adcmap7_die_temp); i++)
582 		if (adcmap7_die_temp[i].x > voltage)
583 			break;
584 
585 	vtemp0 = adcmap7_die_temp[i - 1].x;
586 	voltage = voltage - vtemp0;
587 	temp = div64_s64(voltage * DIE_TEMP_ADC7_SCALE_FACTOR,
588 		adcmap7_die_temp[i - 1].y);
589 	temp += DIE_TEMP_ADC7_SCALE_1 + (DIE_TEMP_ADC7_SCALE_2 * (i - 1));
590 	*result_mdec = temp;
591 
592 	return 0;
593 }
594 
595 static int qcom_vadc_scale_hw_smb_temp(
596 				const struct vadc_prescale_ratio *prescale,
597 				const struct adc5_data *data,
598 				u16 adc_code, int *result_mdec)
599 {
600 	*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code * 100,
601 				prescale, data, PMIC5_SMB_TEMP_SCALE_FACTOR);
602 	*result_mdec = PMIC5_SMB_TEMP_CONSTANT - *result_mdec;
603 
604 	return 0;
605 }
606 
607 static int qcom_vadc_scale_hw_chg5_temp(
608 				const struct vadc_prescale_ratio *prescale,
609 				const struct adc5_data *data,
610 				u16 adc_code, int *result_mdec)
611 {
612 	*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
613 				prescale, data, 4);
614 	*result_mdec = PMIC5_CHG_TEMP_SCALE_FACTOR - *result_mdec;
615 
616 	return 0;
617 }
618 
619 int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
620 		    const struct vadc_linear_graph *calib_graph,
621 		    const struct vadc_prescale_ratio *prescale,
622 		    bool absolute,
623 		    u16 adc_code, int *result)
624 {
625 	switch (scaletype) {
626 	case SCALE_DEFAULT:
627 		return qcom_vadc_scale_volt(calib_graph, prescale,
628 					    absolute, adc_code,
629 					    result);
630 	case SCALE_THERM_100K_PULLUP:
631 	case SCALE_XOTHERM:
632 		return qcom_vadc_scale_therm(calib_graph, prescale,
633 					     absolute, adc_code,
634 					     result);
635 	case SCALE_PMIC_THERM:
636 		return qcom_vadc_scale_die_temp(calib_graph, prescale,
637 						absolute, adc_code,
638 						result);
639 	case SCALE_PMI_CHG_TEMP:
640 		return qcom_vadc_scale_chg_temp(calib_graph, prescale,
641 						absolute, adc_code,
642 						result);
643 	default:
644 		return -EINVAL;
645 	}
646 }
647 EXPORT_SYMBOL(qcom_vadc_scale);
648 
649 int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
650 		    const struct vadc_prescale_ratio *prescale,
651 		    const struct adc5_data *data,
652 		    u16 adc_code, int *result)
653 {
654 	if (!(scaletype >= SCALE_HW_CALIB_DEFAULT &&
655 		scaletype < SCALE_HW_CALIB_INVALID)) {
656 		pr_err("Invalid scale type %d\n", scaletype);
657 		return -EINVAL;
658 	}
659 
660 	return scale_adc5_fn[scaletype].scale_fn(prescale, data,
661 					adc_code, result);
662 }
663 EXPORT_SYMBOL(qcom_adc5_hw_scale);
664 
665 int qcom_vadc_decimation_from_dt(u32 value)
666 {
667 	if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||
668 	    value > VADC_DECIMATION_MAX)
669 		return -EINVAL;
670 
671 	return __ffs64(value / VADC_DECIMATION_MIN);
672 }
673 EXPORT_SYMBOL(qcom_vadc_decimation_from_dt);
674 
675 MODULE_LICENSE("GPL v2");
676 MODULE_DESCRIPTION("Qualcomm ADC common functionality");
677