#include<linux/kernel.h>

typedef struct {
    int r;
    int temperature;
} ntc_table_t;

static ntc_table_t ntc[] = {
    {188424, -40},
    {177892, -39},
    {168031, -38},
    {158793, -37},
    {150135, -36},
    {142016, -35},
    {134398, -34},
    {127247, -33},
    {120531, -32},
    {114221, -31},
    {108289, -30},
    {102711, -29},
    {97461, -28},
    {92519, -27},
    {87865, -26},
    {83480, -25},
    {79346, -24},
    {75447, -23},
    {71769, -22},
    {68297, -21},
    {65019, -20},
    {61922, -19},
    {58995, -18},
    {56228, -17},
    {53610, -16},
    {51133, -15},
    {48789, -14},
    {46568, -13},
    {44465, -12},
    {42472, -11},
    {40582, -10},
    {38789, -9},
    {37089, -8},
    {35475, -7},
    {33942, -6},
    {32486, -5},
    {31103, -4},
    {29789, -3},
    {28539, -2},
    {27350, -1},
    {26219, 0},
    {25142, 1},
    {24117, 2},
    {23140, 3},
    {22210, 4},
    {21324, 5},
    {20479, 6},
    {19673, 7},
    {18904, 8},
    {18170, 9},
    {17470, 10},
    {16801, 11},
    {16162, 12},
    {15552, 13},
    {14969, 14},
    {14412, 15},
    {13879, 16},
    {13369, 17},
    {12881, 18},
    {12414, 19},
    {11967, 20},
    {11539, 21},
    {11129, 22},
    {10737, 23},
    {10360, 24},
    {10000, 25},
    {9617, 26},
    {9252, 27},
    {8902, 28},
    {8569, 29},
    {8249, 30},
    {7944, 31},
    {7652, 32},
    {7372, 33},
    {7104, 34},
    {6848, 35},
    {6602, 36},
    {6367, 37},
    {6142, 38},
    {5926, 39},
    {5719, 40},
    {5520, 41},
    {5329, 42},
    {5147, 43},
    {4971, 44},
    {4803, 45},
    {4641, 46},
    {4486, 47},
    {4336, 48},
    {4193, 49},
    {4055, 50},
    {3923, 51},
    {3795, 52},
    {3673, 53},
    {3555, 54},
    {3442, 55},
    {3333, 56},
    {3228, 57},
    {3127, 58},
    {3029, 59},
    {2936, 60},
    {2845, 61},
    {2758, 62},
    {2674, 63},
    {2593, 64},
    {2516, 65},
    {2440, 66},
    {2368, 67},
    {2298, 68},
    {2230, 69},
    {2165, 70},
    {2103, 71},
    {2042, 72},
    {1983, 73},
    {1927, 74},
    {1872, 75},
    {1819, 76},
    {1768, 77},
    {1719, 78},
    {1671, 79},
    {1625, 80},
    {1580, 81},
    {1537, 82},
    {1496, 83},
    {1455, 84},
    {1416, 85},
    {1378, 86},
    {1342, 87},
    {1306, 88},
    {1272, 89},
    {1239, 90},
    {1207, 91},
    {1176, 92},
    {1145, 93},
    {1116, 94},
    {1088, 95},
    {1060, 96},
    {1034, 97},
    {1008, 98},
    {983,  99},
    {958, 100},
    {935, 101},
    {912, 102},
    {890, 103},
    {868, 104},
    {847, 105},
    {827, 106},
    {807, 107},
    {788, 108},
    {769, 109},
    {751, 110},
    {734, 111},
    {717, 112},
    {700, 113},
    {684, 114},
    {668, 115},
    {653, 116},
    {638, 117},
    {624, 118},
    {610, 119},
    {596, 120},
    {583, 121},
    {570, 122},
    {558, 123},
    {545, 124},
    {534, 125},
};

static unsigned int ntc_abs(int a, int b)
{
    if(a > b) {
        return (a - b);
    }
    return b - a;
}

#define RX(mv) (10000*(mv)/(1800-mv))

int get_ntc_temperature(int mv)
{
    int num = sizeof(ntc) / sizeof(ntc[0]);
    int i = 0;
    unsigned int d = 0xfffffff;
    int t;
    int r = RX(mv);

    while(i < num) {
        if (ntc_abs(r, ntc[i].r) < d) {
            t = ntc[i].temperature;
            d = ntc_abs(r, ntc[i].r);
        }
        i++;
    }

    printk(KERN_DEBUG "v: %d, r: %d, t: %d\n", mv, r, t);
    return t;
}