762 lines
18 KiB
C
762 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/fixp-arith.h>
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#include <linux/iio/adc/qcom-vadc-common.h>
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#include <linux/math64.h>
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#include <linux/log2.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/units.h>
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/**
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* struct vadc_map_pt - Map the graph representation for ADC channel
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* @x: Represent the ADC digitized code.
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* @y: Represent the physical data which can be temperature, voltage,
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* resistance.
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*/
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struct vadc_map_pt {
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s32 x;
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s32 y;
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};
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/* Voltage to temperature */
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static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
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{1758, -40000 },
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{1742, -35000 },
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{1719, -30000 },
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{1691, -25000 },
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{1654, -20000 },
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{1608, -15000 },
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{1551, -10000 },
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{1483, -5000 },
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{1404, 0 },
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{1315, 5000 },
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{1218, 10000 },
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{1114, 15000 },
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{1007, 20000 },
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{900, 25000 },
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{795, 30000 },
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{696, 35000 },
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{605, 40000 },
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{522, 45000 },
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{448, 50000 },
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{383, 55000 },
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{327, 60000 },
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{278, 65000 },
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{237, 70000 },
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{202, 75000 },
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{172, 80000 },
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{146, 85000 },
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{125, 90000 },
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{107, 95000 },
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{92, 100000 },
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{79, 105000 },
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{68, 110000 },
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{59, 115000 },
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{51, 120000 },
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{44, 125000 }
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};
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/*
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* Voltage to temperature table for 100k pull up for NTCG104EF104 with
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* 1.875V reference.
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*/
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static const struct vadc_map_pt adcmap_100k_104ef_104fb_1875_vref[] = {
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{ 1831, -40000 },
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{ 1814, -35000 },
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{ 1791, -30000 },
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{ 1761, -25000 },
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{ 1723, -20000 },
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{ 1675, -15000 },
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{ 1616, -10000 },
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{ 1545, -5000 },
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{ 1463, 0 },
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{ 1370, 5000 },
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{ 1268, 10000 },
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{ 1160, 15000 },
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{ 1049, 20000 },
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{ 937, 25000 },
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{ 828, 30000 },
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{ 726, 35000 },
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{ 630, 40000 },
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{ 544, 45000 },
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{ 467, 50000 },
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{ 399, 55000 },
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{ 340, 60000 },
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{ 290, 65000 },
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{ 247, 70000 },
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{ 209, 75000 },
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{ 179, 80000 },
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{ 153, 85000 },
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{ 130, 90000 },
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{ 112, 95000 },
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{ 96, 100000 },
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{ 82, 105000 },
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{ 71, 110000 },
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{ 62, 115000 },
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{ 53, 120000 },
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{ 46, 125000 },
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};
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static const struct vadc_map_pt adcmap7_die_temp[] = {
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{ 857300, 160000 },
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{ 820100, 140000 },
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{ 782500, 120000 },
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{ 744600, 100000 },
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{ 706400, 80000 },
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{ 667900, 60000 },
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{ 629300, 40000 },
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{ 590500, 20000 },
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{ 551500, 0 },
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{ 512400, -20000 },
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{ 473100, -40000 },
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{ 433700, -60000 },
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};
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/*
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* Resistance to temperature table for 100k pull up for NTCG104EF104.
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*/
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static const struct vadc_map_pt adcmap7_100k[] = {
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{ 4250657, -40960 },
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{ 3962085, -39936 },
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{ 3694875, -38912 },
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{ 3447322, -37888 },
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{ 3217867, -36864 },
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{ 3005082, -35840 },
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{ 2807660, -34816 },
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{ 2624405, -33792 },
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{ 2454218, -32768 },
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{ 2296094, -31744 },
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{ 2149108, -30720 },
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{ 2012414, -29696 },
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{ 1885232, -28672 },
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{ 1766846, -27648 },
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{ 1656598, -26624 },
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{ 1553884, -25600 },
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{ 1458147, -24576 },
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{ 1368873, -23552 },
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{ 1285590, -22528 },
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{ 1207863, -21504 },
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{ 1135290, -20480 },
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{ 1067501, -19456 },
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{ 1004155, -18432 },
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{ 944935, -17408 },
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{ 889550, -16384 },
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{ 837731, -15360 },
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{ 789229, -14336 },
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{ 743813, -13312 },
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{ 701271, -12288 },
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{ 661405, -11264 },
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{ 624032, -10240 },
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{ 588982, -9216 },
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{ 556100, -8192 },
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{ 525239, -7168 },
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{ 496264, -6144 },
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{ 469050, -5120 },
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{ 443480, -4096 },
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{ 419448, -3072 },
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{ 396851, -2048 },
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{ 375597, -1024 },
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{ 355598, 0 },
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{ 336775, 1024 },
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{ 319052, 2048 },
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{ 302359, 3072 },
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{ 286630, 4096 },
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{ 271806, 5120 },
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{ 257829, 6144 },
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{ 244646, 7168 },
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{ 232209, 8192 },
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{ 220471, 9216 },
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{ 209390, 10240 },
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{ 198926, 11264 },
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{ 189040, 12288 },
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{ 179698, 13312 },
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{ 170868, 14336 },
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{ 162519, 15360 },
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{ 154622, 16384 },
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{ 147150, 17408 },
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{ 140079, 18432 },
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{ 133385, 19456 },
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{ 127046, 20480 },
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{ 121042, 21504 },
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{ 115352, 22528 },
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{ 109960, 23552 },
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{ 104848, 24576 },
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{ 100000, 25600 },
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{ 95402, 26624 },
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{ 91038, 27648 },
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{ 86897, 28672 },
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{ 82965, 29696 },
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{ 79232, 30720 },
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{ 75686, 31744 },
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{ 72316, 32768 },
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{ 69114, 33792 },
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{ 66070, 34816 },
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{ 63176, 35840 },
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{ 60423, 36864 },
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{ 57804, 37888 },
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{ 55312, 38912 },
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{ 52940, 39936 },
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{ 50681, 40960 },
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{ 48531, 41984 },
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{ 46482, 43008 },
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{ 44530, 44032 },
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{ 42670, 45056 },
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{ 40897, 46080 },
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{ 39207, 47104 },
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{ 37595, 48128 },
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{ 36057, 49152 },
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{ 34590, 50176 },
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{ 33190, 51200 },
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{ 31853, 52224 },
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{ 30577, 53248 },
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{ 29358, 54272 },
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{ 28194, 55296 },
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{ 27082, 56320 },
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{ 26020, 57344 },
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{ 25004, 58368 },
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{ 24033, 59392 },
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{ 23104, 60416 },
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{ 22216, 61440 },
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{ 21367, 62464 },
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{ 20554, 63488 },
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{ 19776, 64512 },
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{ 19031, 65536 },
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{ 18318, 66560 },
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{ 17636, 67584 },
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{ 16982, 68608 },
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{ 16355, 69632 },
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{ 15755, 70656 },
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{ 15180, 71680 },
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{ 14628, 72704 },
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{ 14099, 73728 },
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{ 13592, 74752 },
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{ 13106, 75776 },
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{ 12640, 76800 },
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{ 12192, 77824 },
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{ 11762, 78848 },
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{ 11350, 79872 },
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{ 10954, 80896 },
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{ 10574, 81920 },
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{ 10209, 82944 },
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{ 9858, 83968 },
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{ 9521, 84992 },
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{ 9197, 86016 },
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{ 8886, 87040 },
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{ 8587, 88064 },
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{ 8299, 89088 },
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{ 8023, 90112 },
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{ 7757, 91136 },
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{ 7501, 92160 },
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{ 7254, 93184 },
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{ 7017, 94208 },
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{ 6789, 95232 },
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{ 6570, 96256 },
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{ 6358, 97280 },
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{ 6155, 98304 },
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{ 5959, 99328 },
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{ 5770, 100352 },
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{ 5588, 101376 },
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{ 5412, 102400 },
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{ 5243, 103424 },
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{ 5080, 104448 },
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{ 4923, 105472 },
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{ 4771, 106496 },
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{ 4625, 107520 },
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{ 4484, 108544 },
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{ 4348, 109568 },
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{ 4217, 110592 },
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{ 4090, 111616 },
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{ 3968, 112640 },
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{ 3850, 113664 },
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{ 3736, 114688 },
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{ 3626, 115712 },
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{ 3519, 116736 },
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{ 3417, 117760 },
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{ 3317, 118784 },
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{ 3221, 119808 },
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{ 3129, 120832 },
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{ 3039, 121856 },
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{ 2952, 122880 },
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{ 2868, 123904 },
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{ 2787, 124928 },
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{ 2709, 125952 },
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{ 2633, 126976 },
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{ 2560, 128000 },
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{ 2489, 129024 },
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{ 2420, 130048 }
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};
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static const struct vadc_prescale_ratio adc5_prescale_ratios[] = {
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{.num = 1, .den = 1},
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{.num = 1, .den = 3},
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{.num = 1, .den = 4},
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{.num = 1, .den = 6},
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{.num = 1, .den = 20},
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{.num = 1, .den = 8},
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{.num = 10, .den = 81},
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{.num = 1, .den = 10},
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{.num = 1, .den = 16}
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};
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static int qcom_vadc_scale_hw_calib_volt(
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const struct vadc_prescale_ratio *prescale,
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const struct adc5_data *data,
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u16 adc_code, int *result_uv);
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static int qcom_vadc_scale_hw_calib_therm(
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const struct vadc_prescale_ratio *prescale,
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const struct adc5_data *data,
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u16 adc_code, int *result_mdec);
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static int qcom_vadc7_scale_hw_calib_therm(
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const struct vadc_prescale_ratio *prescale,
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const struct adc5_data *data,
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u16 adc_code, int *result_mdec);
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static int qcom_vadc_scale_hw_smb_temp(
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const struct vadc_prescale_ratio *prescale,
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const struct adc5_data *data,
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u16 adc_code, int *result_mdec);
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static int qcom_vadc_scale_hw_chg5_temp(
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const struct vadc_prescale_ratio *prescale,
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const struct adc5_data *data,
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u16 adc_code, int *result_mdec);
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static int qcom_vadc_scale_hw_calib_die_temp(
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const struct vadc_prescale_ratio *prescale,
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const struct adc5_data *data,
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u16 adc_code, int *result_mdec);
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static int qcom_vadc7_scale_hw_calib_die_temp(
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const struct vadc_prescale_ratio *prescale,
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const struct adc5_data *data,
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u16 adc_code, int *result_mdec);
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static struct qcom_adc5_scale_type scale_adc5_fn[] = {
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[SCALE_HW_CALIB_DEFAULT] = {qcom_vadc_scale_hw_calib_volt},
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[SCALE_HW_CALIB_THERM_100K_PULLUP] = {qcom_vadc_scale_hw_calib_therm},
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[SCALE_HW_CALIB_XOTHERM] = {qcom_vadc_scale_hw_calib_therm},
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[SCALE_HW_CALIB_THERM_100K_PU_PM7] = {
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qcom_vadc7_scale_hw_calib_therm},
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[SCALE_HW_CALIB_PMIC_THERM] = {qcom_vadc_scale_hw_calib_die_temp},
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[SCALE_HW_CALIB_PMIC_THERM_PM7] = {
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qcom_vadc7_scale_hw_calib_die_temp},
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[SCALE_HW_CALIB_PM5_CHG_TEMP] = {qcom_vadc_scale_hw_chg5_temp},
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[SCALE_HW_CALIB_PM5_SMB_TEMP] = {qcom_vadc_scale_hw_smb_temp},
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};
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static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,
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u32 tablesize, s32 input, int *output)
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{
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u32 i = 0;
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if (!pts)
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return -EINVAL;
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while (i < tablesize && pts[i].x > input)
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i++;
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if (i == 0) {
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*output = pts[0].y;
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} else if (i == tablesize) {
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*output = pts[tablesize - 1].y;
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} else {
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/* interpolate linearly */
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*output = fixp_linear_interpolate(pts[i - 1].x, pts[i - 1].y,
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pts[i].x, pts[i].y,
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input);
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}
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return 0;
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}
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static s32 qcom_vadc_map_temp_voltage(const struct vadc_map_pt *pts,
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u32 tablesize, int input)
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{
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u32 i = 0;
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/*
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* Table must be sorted, find the interval of 'y' which contains value
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* 'input' and map it to proper 'x' value
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*/
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while (i < tablesize && pts[i].y < input)
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i++;
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if (i == 0)
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return pts[0].x;
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if (i == tablesize)
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return pts[tablesize - 1].x;
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/* interpolate linearly */
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return fixp_linear_interpolate(pts[i - 1].y, pts[i - 1].x,
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pts[i].y, pts[i].x, input);
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}
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static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph,
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u16 adc_code,
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bool absolute,
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s64 *scale_voltage)
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{
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*scale_voltage = (adc_code - calib_graph->gnd);
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*scale_voltage *= calib_graph->dx;
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*scale_voltage = div64_s64(*scale_voltage, calib_graph->dy);
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if (absolute)
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*scale_voltage += calib_graph->dx;
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if (*scale_voltage < 0)
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*scale_voltage = 0;
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}
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static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute, u16 adc_code,
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int *result_uv)
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{
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s64 voltage = 0, result = 0;
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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voltage = voltage * prescale->den;
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result = div64_s64(voltage, prescale->num);
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*result_uv = result;
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return 0;
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}
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static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute, u16 adc_code,
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int *result_mdec)
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{
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s64 voltage = 0;
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int ret;
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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if (absolute)
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voltage = div64_s64(voltage, 1000);
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ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb,
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ARRAY_SIZE(adcmap_100k_104ef_104fb),
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voltage, result_mdec);
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if (ret)
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return ret;
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return 0;
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}
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static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute,
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u16 adc_code, int *result_mdec)
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{
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s64 voltage = 0;
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u64 temp; /* Temporary variable for do_div */
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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if (voltage > 0) {
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temp = voltage * prescale->den;
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do_div(temp, prescale->num * 2);
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voltage = temp;
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} else {
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voltage = 0;
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}
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*result_mdec = milli_kelvin_to_millicelsius(voltage);
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return 0;
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}
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static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute,
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u16 adc_code, int *result_mdec)
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{
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s64 voltage = 0, result = 0;
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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voltage = voltage * prescale->den;
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voltage = div64_s64(voltage, prescale->num);
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voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));
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voltage = (voltage + PMI_CHG_SCALE_2);
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result = div64_s64(voltage, 1000000);
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*result_mdec = result;
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return 0;
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}
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/* convert voltage to ADC code, using 1.875V reference */
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static u16 qcom_vadc_scale_voltage_code(s32 voltage,
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const struct vadc_prescale_ratio *prescale,
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const u32 full_scale_code_volt,
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unsigned int factor)
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{
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s64 volt = voltage;
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s64 adc_vdd_ref_mv = 1875; /* reference voltage */
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volt *= prescale->num * factor * full_scale_code_volt;
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volt = div64_s64(volt, (s64)prescale->den * adc_vdd_ref_mv * 1000);
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return volt;
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}
|
|
|
|
static int qcom_vadc_scale_code_voltage_factor(u16 adc_code,
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
unsigned int factor)
|
|
{
|
|
s64 voltage, temp, adc_vdd_ref_mv = 1875;
|
|
|
|
/*
|
|
* The normal data range is between 0V to 1.875V. On cases where
|
|
* we read low voltage values, the ADC code can go beyond the
|
|
* range and the scale result is incorrect so we clamp the values
|
|
* for the cases where the code represents a value below 0V
|
|
*/
|
|
if (adc_code > VADC5_MAX_CODE)
|
|
adc_code = 0;
|
|
|
|
/* (ADC code * vref_vadc (1.875V)) / full_scale_code */
|
|
voltage = (s64) adc_code * adc_vdd_ref_mv * 1000;
|
|
voltage = div64_s64(voltage, data->full_scale_code_volt);
|
|
if (voltage > 0) {
|
|
voltage *= prescale->den;
|
|
temp = prescale->num * factor;
|
|
voltage = div64_s64(voltage, temp);
|
|
} else {
|
|
voltage = 0;
|
|
}
|
|
|
|
return (int) voltage;
|
|
}
|
|
|
|
static int qcom_vadc7_scale_hw_calib_therm(
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result_mdec)
|
|
{
|
|
s64 resistance = adc_code;
|
|
int ret, result;
|
|
|
|
if (adc_code >= RATIO_MAX_ADC7)
|
|
return -EINVAL;
|
|
|
|
/* (ADC code * R_PULLUP (100Kohm)) / (full_scale_code - ADC code)*/
|
|
resistance *= R_PU_100K;
|
|
resistance = div64_s64(resistance, RATIO_MAX_ADC7 - adc_code);
|
|
|
|
ret = qcom_vadc_map_voltage_temp(adcmap7_100k,
|
|
ARRAY_SIZE(adcmap7_100k),
|
|
resistance, &result);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*result_mdec = result;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_vadc_scale_hw_calib_volt(
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result_uv)
|
|
{
|
|
*result_uv = qcom_vadc_scale_code_voltage_factor(adc_code,
|
|
prescale, data, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_vadc_scale_hw_calib_therm(
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result_mdec)
|
|
{
|
|
int voltage;
|
|
|
|
voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
|
|
prescale, data, 1000);
|
|
|
|
/* Map voltage to temperature from look-up table */
|
|
return qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb_1875_vref,
|
|
ARRAY_SIZE(adcmap_100k_104ef_104fb_1875_vref),
|
|
voltage, result_mdec);
|
|
}
|
|
|
|
static int qcom_vadc_scale_hw_calib_die_temp(
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result_mdec)
|
|
{
|
|
*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
|
|
prescale, data, 2);
|
|
*result_mdec = milli_kelvin_to_millicelsius(*result_mdec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_vadc7_scale_hw_calib_die_temp(
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result_mdec)
|
|
{
|
|
|
|
int voltage;
|
|
|
|
voltage = qcom_vadc_scale_code_voltage_factor(adc_code,
|
|
prescale, data, 1);
|
|
|
|
return qcom_vadc_map_voltage_temp(adcmap7_die_temp, ARRAY_SIZE(adcmap7_die_temp),
|
|
voltage, result_mdec);
|
|
}
|
|
|
|
static int qcom_vadc_scale_hw_smb_temp(
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result_mdec)
|
|
{
|
|
*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code * 100,
|
|
prescale, data, PMIC5_SMB_TEMP_SCALE_FACTOR);
|
|
*result_mdec = PMIC5_SMB_TEMP_CONSTANT - *result_mdec;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_vadc_scale_hw_chg5_temp(
|
|
const struct vadc_prescale_ratio *prescale,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result_mdec)
|
|
{
|
|
*result_mdec = qcom_vadc_scale_code_voltage_factor(adc_code,
|
|
prescale, data, 4);
|
|
*result_mdec = PMIC5_CHG_TEMP_SCALE_FACTOR - *result_mdec;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
|
|
const struct vadc_linear_graph *calib_graph,
|
|
const struct vadc_prescale_ratio *prescale,
|
|
bool absolute,
|
|
u16 adc_code, int *result)
|
|
{
|
|
switch (scaletype) {
|
|
case SCALE_DEFAULT:
|
|
return qcom_vadc_scale_volt(calib_graph, prescale,
|
|
absolute, adc_code,
|
|
result);
|
|
case SCALE_THERM_100K_PULLUP:
|
|
case SCALE_XOTHERM:
|
|
return qcom_vadc_scale_therm(calib_graph, prescale,
|
|
absolute, adc_code,
|
|
result);
|
|
case SCALE_PMIC_THERM:
|
|
return qcom_vadc_scale_die_temp(calib_graph, prescale,
|
|
absolute, adc_code,
|
|
result);
|
|
case SCALE_PMI_CHG_TEMP:
|
|
return qcom_vadc_scale_chg_temp(calib_graph, prescale,
|
|
absolute, adc_code,
|
|
result);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(qcom_vadc_scale);
|
|
|
|
u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
|
|
u32 full_scale_code_volt, int temp)
|
|
{
|
|
const struct vadc_prescale_ratio *prescale = &adc5_prescale_ratios[prescale_ratio];
|
|
s32 voltage;
|
|
|
|
voltage = qcom_vadc_map_temp_voltage(adcmap_100k_104ef_104fb_1875_vref,
|
|
ARRAY_SIZE(adcmap_100k_104ef_104fb_1875_vref),
|
|
temp);
|
|
return qcom_vadc_scale_voltage_code(voltage, prescale, full_scale_code_volt, 1000);
|
|
}
|
|
EXPORT_SYMBOL(qcom_adc_tm5_temp_volt_scale);
|
|
|
|
int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
|
|
unsigned int prescale_ratio,
|
|
const struct adc5_data *data,
|
|
u16 adc_code, int *result)
|
|
{
|
|
const struct vadc_prescale_ratio *prescale = &adc5_prescale_ratios[prescale_ratio];
|
|
|
|
if (!(scaletype >= SCALE_HW_CALIB_DEFAULT &&
|
|
scaletype < SCALE_HW_CALIB_INVALID)) {
|
|
pr_err("Invalid scale type %d\n", scaletype);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return scale_adc5_fn[scaletype].scale_fn(prescale, data,
|
|
adc_code, result);
|
|
}
|
|
EXPORT_SYMBOL(qcom_adc5_hw_scale);
|
|
|
|
int qcom_adc5_prescaling_from_dt(u32 num, u32 den)
|
|
{
|
|
unsigned int pre;
|
|
|
|
for (pre = 0; pre < ARRAY_SIZE(adc5_prescale_ratios); pre++)
|
|
if (adc5_prescale_ratios[pre].num == num &&
|
|
adc5_prescale_ratios[pre].den == den)
|
|
break;
|
|
|
|
if (pre == ARRAY_SIZE(adc5_prescale_ratios))
|
|
return -EINVAL;
|
|
|
|
return pre;
|
|
}
|
|
EXPORT_SYMBOL(qcom_adc5_prescaling_from_dt);
|
|
|
|
int qcom_adc5_hw_settle_time_from_dt(u32 value,
|
|
const unsigned int *hw_settle)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < VADC_HW_SETTLE_SAMPLES_MAX; i++) {
|
|
if (value == hw_settle[i])
|
|
return i;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(qcom_adc5_hw_settle_time_from_dt);
|
|
|
|
int qcom_adc5_avg_samples_from_dt(u32 value)
|
|
{
|
|
if (!is_power_of_2(value) || value > ADC5_AVG_SAMPLES_MAX)
|
|
return -EINVAL;
|
|
|
|
return __ffs(value);
|
|
}
|
|
EXPORT_SYMBOL(qcom_adc5_avg_samples_from_dt);
|
|
|
|
int qcom_adc5_decimation_from_dt(u32 value, const unsigned int *decimation)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ADC5_DECIMATION_SAMPLES_MAX; i++) {
|
|
if (value == decimation[i])
|
|
return i;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(qcom_adc5_decimation_from_dt);
|
|
|
|
int qcom_vadc_decimation_from_dt(u32 value)
|
|
{
|
|
if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||
|
|
value > VADC_DECIMATION_MAX)
|
|
return -EINVAL;
|
|
|
|
return __ffs64(value / VADC_DECIMATION_MIN);
|
|
}
|
|
EXPORT_SYMBOL(qcom_vadc_decimation_from_dt);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Qualcomm ADC common functionality");
|