// SPDX-License-Identifier: GPL-2.0-or-later /* * ntc_thermistor.c - NTC Thermistors * * Copyright (C) 2010 Samsung Electronics * MyungJoo Ham */ #include #include #include #include #include #include #include #include #include #include enum ntc_thermistor_type { TYPE_B57330V2103, TYPE_B57891S0103, TYPE_NCPXXWB473, TYPE_NCPXXWF104, TYPE_NCPXXWL333, TYPE_NCPXXXH103, }; struct ntc_compensation { int temp_c; unsigned int ohm; }; /* * Used as index in a zero-terminated array, holes not allowed so * that NTC_LAST is the first empty array entry. */ enum { NTC_B57330V2103, NTC_B57891S0103, NTC_NCP03WB473, NTC_NCP03WF104, NTC_NCP15WB473, NTC_NCP15WL333, NTC_NCP15XH103, NTC_NCP18WB473, NTC_NCP21WB473, NTC_LAST, }; static const struct platform_device_id ntc_thermistor_id[] = { [NTC_B57330V2103] = { "b57330v2103", TYPE_B57330V2103 }, [NTC_B57891S0103] = { "b57891s0103", TYPE_B57891S0103 }, [NTC_NCP03WB473] = { "ncp03wb473", TYPE_NCPXXWB473 }, [NTC_NCP03WF104] = { "ncp03wf104", TYPE_NCPXXWF104 }, [NTC_NCP15WB473] = { "ncp15wb473", TYPE_NCPXXWB473 }, [NTC_NCP15WL333] = { "ncp15wl333", TYPE_NCPXXWL333 }, [NTC_NCP15XH103] = { "ncp15xh103", TYPE_NCPXXXH103 }, [NTC_NCP18WB473] = { "ncp18wb473", TYPE_NCPXXWB473 }, [NTC_NCP21WB473] = { "ncp21wb473", TYPE_NCPXXWB473 }, [NTC_LAST] = { }, }; /* * A compensation table should be sorted by the values of .ohm * in descending order. * The following compensation tables are from the specification of Murata NTC * Thermistors Datasheet */ static const struct ntc_compensation ncpXXwb473[] = { { .temp_c = -40, .ohm = 1747920 }, { .temp_c = -35, .ohm = 1245428 }, { .temp_c = -30, .ohm = 898485 }, { .temp_c = -25, .ohm = 655802 }, { .temp_c = -20, .ohm = 483954 }, { .temp_c = -15, .ohm = 360850 }, { .temp_c = -10, .ohm = 271697 }, { .temp_c = -5, .ohm = 206463 }, { .temp_c = 0, .ohm = 158214 }, { .temp_c = 5, .ohm = 122259 }, { .temp_c = 10, .ohm = 95227 }, { .temp_c = 15, .ohm = 74730 }, { .temp_c = 20, .ohm = 59065 }, { .temp_c = 25, .ohm = 47000 }, { .temp_c = 30, .ohm = 37643 }, { .temp_c = 35, .ohm = 30334 }, { .temp_c = 40, .ohm = 24591 }, { .temp_c = 45, .ohm = 20048 }, { .temp_c = 50, .ohm = 16433 }, { .temp_c = 55, .ohm = 13539 }, { .temp_c = 60, .ohm = 11209 }, { .temp_c = 65, .ohm = 9328 }, { .temp_c = 70, .ohm = 7798 }, { .temp_c = 75, .ohm = 6544 }, { .temp_c = 80, .ohm = 5518 }, { .temp_c = 85, .ohm = 4674 }, { .temp_c = 90, .ohm = 3972 }, { .temp_c = 95, .ohm = 3388 }, { .temp_c = 100, .ohm = 2902 }, { .temp_c = 105, .ohm = 2494 }, { .temp_c = 110, .ohm = 2150 }, { .temp_c = 115, .ohm = 1860 }, { .temp_c = 120, .ohm = 1615 }, { .temp_c = 125, .ohm = 1406 }, }; static const struct ntc_compensation ncpXXwl333[] = { { .temp_c = -40, .ohm = 1610154 }, { .temp_c = -35, .ohm = 1130850 }, { .temp_c = -30, .ohm = 802609 }, { .temp_c = -25, .ohm = 575385 }, { .temp_c = -20, .ohm = 416464 }, { .temp_c = -15, .ohm = 304219 }, { .temp_c = -10, .ohm = 224193 }, { .temp_c = -5, .ohm = 166623 }, { .temp_c = 0, .ohm = 124850 }, { .temp_c = 5, .ohm = 94287 }, { .temp_c = 10, .ohm = 71747 }, { .temp_c = 15, .ohm = 54996 }, { .temp_c = 20, .ohm = 42455 }, { .temp_c = 25, .ohm = 33000 }, { .temp_c = 30, .ohm = 25822 }, { .temp_c = 35, .ohm = 20335 }, { .temp_c = 40, .ohm = 16115 }, { .temp_c = 45, .ohm = 12849 }, { .temp_c = 50, .ohm = 10306 }, { .temp_c = 55, .ohm = 8314 }, { .temp_c = 60, .ohm = 6746 }, { .temp_c = 65, .ohm = 5503 }, { .temp_c = 70, .ohm = 4513 }, { .temp_c = 75, .ohm = 3721 }, { .temp_c = 80, .ohm = 3084 }, { .temp_c = 85, .ohm = 2569 }, { .temp_c = 90, .ohm = 2151 }, { .temp_c = 95, .ohm = 1809 }, { .temp_c = 100, .ohm = 1529 }, { .temp_c = 105, .ohm = 1299 }, { .temp_c = 110, .ohm = 1108 }, { .temp_c = 115, .ohm = 949 }, { .temp_c = 120, .ohm = 817 }, { .temp_c = 125, .ohm = 707 }, }; static const struct ntc_compensation ncpXXwf104[] = { { .temp_c = -40, .ohm = 4397119 }, { .temp_c = -35, .ohm = 3088599 }, { .temp_c = -30, .ohm = 2197225 }, { .temp_c = -25, .ohm = 1581881 }, { .temp_c = -20, .ohm = 1151037 }, { .temp_c = -15, .ohm = 846579 }, { .temp_c = -10, .ohm = 628988 }, { .temp_c = -5, .ohm = 471632 }, { .temp_c = 0, .ohm = 357012 }, { .temp_c = 5, .ohm = 272500 }, { .temp_c = 10, .ohm = 209710 }, { .temp_c = 15, .ohm = 162651 }, { .temp_c = 20, .ohm = 127080 }, { .temp_c = 25, .ohm = 100000 }, { .temp_c = 30, .ohm = 79222 }, { .temp_c = 35, .ohm = 63167 }, { .temp_c = 40, .ohm = 50677 }, { .temp_c = 45, .ohm = 40904 }, { .temp_c = 50, .ohm = 33195 }, { .temp_c = 55, .ohm = 27091 }, { .temp_c = 60, .ohm = 22224 }, { .temp_c = 65, .ohm = 18323 }, { .temp_c = 70, .ohm = 15184 }, { .temp_c = 75, .ohm = 12635 }, { .temp_c = 80, .ohm = 10566 }, { .temp_c = 85, .ohm = 8873 }, { .temp_c = 90, .ohm = 7481 }, { .temp_c = 95, .ohm = 6337 }, { .temp_c = 100, .ohm = 5384 }, { .temp_c = 105, .ohm = 4594 }, { .temp_c = 110, .ohm = 3934 }, { .temp_c = 115, .ohm = 3380 }, { .temp_c = 120, .ohm = 2916 }, { .temp_c = 125, .ohm = 2522 }, }; static const struct ntc_compensation ncpXXxh103[] = { { .temp_c = -40, .ohm = 247565 }, { .temp_c = -35, .ohm = 181742 }, { .temp_c = -30, .ohm = 135128 }, { .temp_c = -25, .ohm = 101678 }, { .temp_c = -20, .ohm = 77373 }, { .temp_c = -15, .ohm = 59504 }, { .temp_c = -10, .ohm = 46222 }, { .temp_c = -5, .ohm = 36244 }, { .temp_c = 0, .ohm = 28674 }, { .temp_c = 5, .ohm = 22878 }, { .temp_c = 10, .ohm = 18399 }, { .temp_c = 15, .ohm = 14910 }, { .temp_c = 20, .ohm = 12169 }, { .temp_c = 25, .ohm = 10000 }, { .temp_c = 30, .ohm = 8271 }, { .temp_c = 35, .ohm = 6883 }, { .temp_c = 40, .ohm = 5762 }, { .temp_c = 45, .ohm = 4851 }, { .temp_c = 50, .ohm = 4105 }, { .temp_c = 55, .ohm = 3492 }, { .temp_c = 60, .ohm = 2985 }, { .temp_c = 65, .ohm = 2563 }, { .temp_c = 70, .ohm = 2211 }, { .temp_c = 75, .ohm = 1915 }, { .temp_c = 80, .ohm = 1666 }, { .temp_c = 85, .ohm = 1454 }, { .temp_c = 90, .ohm = 1275 }, { .temp_c = 95, .ohm = 1121 }, { .temp_c = 100, .ohm = 990 }, { .temp_c = 105, .ohm = 876 }, { .temp_c = 110, .ohm = 779 }, { .temp_c = 115, .ohm = 694 }, { .temp_c = 120, .ohm = 620 }, { .temp_c = 125, .ohm = 556 }, }; /* * The following compensation tables are from the specifications in EPCOS NTC * Thermistors Datasheets */ static const struct ntc_compensation b57330v2103[] = { { .temp_c = -40, .ohm = 190030 }, { .temp_c = -35, .ohm = 145360 }, { .temp_c = -30, .ohm = 112060 }, { .temp_c = -25, .ohm = 87041 }, { .temp_c = -20, .ohm = 68104 }, { .temp_c = -15, .ohm = 53665 }, { .temp_c = -10, .ohm = 42576 }, { .temp_c = -5, .ohm = 34001 }, { .temp_c = 0, .ohm = 27326 }, { .temp_c = 5, .ohm = 22096 }, { .temp_c = 10, .ohm = 17973 }, { .temp_c = 15, .ohm = 14703 }, { .temp_c = 20, .ohm = 12090 }, { .temp_c = 25, .ohm = 10000 }, { .temp_c = 30, .ohm = 8311 }, { .temp_c = 35, .ohm = 6941 }, { .temp_c = 40, .ohm = 5825 }, { .temp_c = 45, .ohm = 4911 }, { .temp_c = 50, .ohm = 4158 }, { .temp_c = 55, .ohm = 3536 }, { .temp_c = 60, .ohm = 3019 }, { .temp_c = 65, .ohm = 2588 }, { .temp_c = 70, .ohm = 2227 }, { .temp_c = 75, .ohm = 1924 }, { .temp_c = 80, .ohm = 1668 }, { .temp_c = 85, .ohm = 1451 }, { .temp_c = 90, .ohm = 1266 }, { .temp_c = 95, .ohm = 1108 }, { .temp_c = 100, .ohm = 973 }, { .temp_c = 105, .ohm = 857 }, { .temp_c = 110, .ohm = 757 }, { .temp_c = 115, .ohm = 671 }, { .temp_c = 120, .ohm = 596 }, { .temp_c = 125, .ohm = 531 }, }; static const struct ntc_compensation b57891s0103[] = { { .temp_c = -55.0, .ohm = 878900 }, { .temp_c = -50.0, .ohm = 617590 }, { .temp_c = -45.0, .ohm = 439340 }, { .temp_c = -40.0, .ohm = 316180 }, { .temp_c = -35.0, .ohm = 230060 }, { .temp_c = -30.0, .ohm = 169150 }, { .temp_c = -25.0, .ohm = 125550 }, { .temp_c = -20.0, .ohm = 94143 }, { .temp_c = -15.0, .ohm = 71172 }, { .temp_c = -10.0, .ohm = 54308 }, { .temp_c = -5.0, .ohm = 41505 }, { .temp_c = 0.0, .ohm = 32014 }, { .temp_c = 5.0, .ohm = 25011 }, { .temp_c = 10.0, .ohm = 19691 }, { .temp_c = 15.0, .ohm = 15618 }, { .temp_c = 20.0, .ohm = 12474 }, { .temp_c = 25.0, .ohm = 10000 }, { .temp_c = 30.0, .ohm = 8080 }, { .temp_c = 35.0, .ohm = 6569 }, { .temp_c = 40.0, .ohm = 5372 }, { .temp_c = 45.0, .ohm = 4424 }, { .temp_c = 50.0, .ohm = 3661 }, { .temp_c = 55.0, .ohm = 3039 }, { .temp_c = 60.0, .ohm = 2536 }, { .temp_c = 65.0, .ohm = 2128 }, { .temp_c = 70.0, .ohm = 1794 }, { .temp_c = 75.0, .ohm = 1518 }, { .temp_c = 80.0, .ohm = 1290 }, { .temp_c = 85.0, .ohm = 1100 }, { .temp_c = 90.0, .ohm = 942 }, { .temp_c = 95.0, .ohm = 809 }, { .temp_c = 100.0, .ohm = 697 }, { .temp_c = 105.0, .ohm = 604 }, { .temp_c = 110.0, .ohm = 525 }, { .temp_c = 115.0, .ohm = 457 }, { .temp_c = 120.0, .ohm = 400 }, { .temp_c = 125.0, .ohm = 351 }, { .temp_c = 130.0, .ohm = 308 }, { .temp_c = 135.0, .ohm = 272 }, { .temp_c = 140.0, .ohm = 240 }, { .temp_c = 145.0, .ohm = 213 }, { .temp_c = 150.0, .ohm = 189 }, { .temp_c = 155.0, .ohm = 168 }, }; struct ntc_type { const struct ntc_compensation *comp; int n_comp; }; #define NTC_TYPE(ntc, compensation) \ [(ntc)] = { .comp = (compensation), .n_comp = ARRAY_SIZE(compensation) } static const struct ntc_type ntc_type[] = { NTC_TYPE(TYPE_B57330V2103, b57330v2103), NTC_TYPE(TYPE_B57891S0103, b57891s0103), NTC_TYPE(TYPE_NCPXXWB473, ncpXXwb473), NTC_TYPE(TYPE_NCPXXWF104, ncpXXwf104), NTC_TYPE(TYPE_NCPXXWL333, ncpXXwl333), NTC_TYPE(TYPE_NCPXXXH103, ncpXXxh103), }; /* * pullup_uV, pullup_ohm, pulldown_ohm, and connect are required. * * How to setup pullup_ohm, pulldown_ohm, and connect is * described at Documentation/hwmon/ntc_thermistor.rst * * pullup/down_ohm: 0 for infinite / not-connected * * chan: iio_channel pointer to communicate with the ADC which the * thermistor is using for conversion of the analog values. */ struct ntc_data { const struct ntc_compensation *comp; int n_comp; unsigned int pullup_uv; unsigned int pullup_ohm; unsigned int pulldown_ohm; enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect; struct iio_channel *chan; }; static int ntc_adc_iio_read(struct ntc_data *data) { struct iio_channel *channel = data->chan; int uv, ret; ret = iio_read_channel_processed_scale(channel, &uv, 1000); if (ret < 0) { int raw; /* * This fallback uses a raw read and then * assumes the ADC is 12 bits, scaling with * a factor 1000 to get to microvolts. */ ret = iio_read_channel_raw(channel, &raw); if (ret < 0) { pr_err("read channel() error: %d\n", ret); return ret; } ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000); if (ret < 0) { /* Assume 12 bit ADC with vref at pullup_uv */ uv = (data->pullup_uv * (s64)raw) >> 12; } } return uv; } static const struct of_device_id ntc_match[] = { { .compatible = "epcos,b57330v2103", .data = &ntc_thermistor_id[NTC_B57330V2103]}, { .compatible = "epcos,b57891s0103", .data = &ntc_thermistor_id[NTC_B57891S0103] }, { .compatible = "murata,ncp03wb473", .data = &ntc_thermistor_id[NTC_NCP03WB473] }, { .compatible = "murata,ncp03wf104", .data = &ntc_thermistor_id[NTC_NCP03WF104] }, { .compatible = "murata,ncp15wb473", .data = &ntc_thermistor_id[NTC_NCP15WB473] }, { .compatible = "murata,ncp15wl333", .data = &ntc_thermistor_id[NTC_NCP15WL333] }, { .compatible = "murata,ncp15xh103", .data = &ntc_thermistor_id[NTC_NCP15XH103] }, { .compatible = "murata,ncp18wb473", .data = &ntc_thermistor_id[NTC_NCP18WB473] }, { .compatible = "murata,ncp21wb473", .data = &ntc_thermistor_id[NTC_NCP21WB473] }, /* Usage of vendor name "ntc" is deprecated */ { .compatible = "ntc,ncp03wb473", .data = &ntc_thermistor_id[NTC_NCP03WB473] }, { .compatible = "ntc,ncp15wb473", .data = &ntc_thermistor_id[NTC_NCP15WB473] }, { .compatible = "ntc,ncp15wl333", .data = &ntc_thermistor_id[NTC_NCP15WL333] }, { .compatible = "ntc,ncp18wb473", .data = &ntc_thermistor_id[NTC_NCP18WB473] }, { .compatible = "ntc,ncp21wb473", .data = &ntc_thermistor_id[NTC_NCP21WB473] }, { }, }; MODULE_DEVICE_TABLE(of, ntc_match); static inline u64 div64_u64_safe(u64 dividend, u64 divisor) { if (divisor == 0 && dividend == 0) return 0; if (divisor == 0) return UINT_MAX; return div64_u64(dividend, divisor); } static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) { u32 puv = data->pullup_uv; u64 n, puo, pdo; puo = data->pullup_ohm; pdo = data->pulldown_ohm; if (uv == 0) return (data->connect == NTC_CONNECTED_POSITIVE) ? INT_MAX : 0; if (uv >= puv) return (data->connect == NTC_CONNECTED_POSITIVE) ? 0 : INT_MAX; if (data->connect == NTC_CONNECTED_POSITIVE && puo == 0) n = div_u64(pdo * (puv - uv), uv); else if (data->connect == NTC_CONNECTED_GROUND && pdo == 0) n = div_u64(puo * uv, puv - uv); else if (data->connect == NTC_CONNECTED_POSITIVE) n = div64_u64_safe(pdo * puo * (puv - uv), puo * uv - pdo * (puv - uv)); else n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv); if (n > INT_MAX) n = INT_MAX; return n; } static void lookup_comp(struct ntc_data *data, unsigned int ohm, int *i_low, int *i_high) { int start, end, mid; /* * Handle special cases: Resistance is higher than or equal to * resistance in first table entry, or resistance is lower or equal * to resistance in last table entry. * In these cases, return i_low == i_high, either pointing to the * beginning or to the end of the table depending on the condition. */ if (ohm >= data->comp[0].ohm) { *i_low = 0; *i_high = 0; return; } if (ohm <= data->comp[data->n_comp - 1].ohm) { *i_low = data->n_comp - 1; *i_high = data->n_comp - 1; return; } /* Do a binary search on compensation table */ start = 0; end = data->n_comp; while (start < end) { mid = start + (end - start) / 2; /* * start <= mid < end * data->comp[start].ohm > ohm >= data->comp[end].ohm * * We could check for "ohm == data->comp[mid].ohm" here, but * that is a quite unlikely condition, and we would have to * check again after updating start. Check it at the end instead * for simplicity. */ if (ohm >= data->comp[mid].ohm) { end = mid; } else { start = mid + 1; /* * ohm >= data->comp[start].ohm might be true here, * since we set start to mid + 1. In that case, we are * done. We could keep going, but the condition is quite * likely to occur, so it is worth checking for it. */ if (ohm >= data->comp[start].ohm) end = start; } /* * start <= end * data->comp[start].ohm >= ohm >= data->comp[end].ohm */ } /* * start == end * ohm >= data->comp[end].ohm */ *i_low = end; if (ohm == data->comp[end].ohm) *i_high = end; else *i_high = end - 1; } static int get_temp_mc(struct ntc_data *data, unsigned int ohm) { int low, high; int temp; lookup_comp(data, ohm, &low, &high); /* * First multiplying the table temperatures with 1000 to get to * millicentigrades (which is what we want) and then interpolating * will give the best precision. */ temp = fixp_linear_interpolate(data->comp[low].ohm, data->comp[low].temp_c * 1000, data->comp[high].ohm, data->comp[high].temp_c * 1000, ohm); return temp; } static int ntc_thermistor_get_ohm(struct ntc_data *data) { int read_uv; read_uv = ntc_adc_iio_read(data); if (read_uv < 0) return read_uv; return get_ohm_of_thermistor(data, read_uv); } static int ntc_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { struct ntc_data *data = dev_get_drvdata(dev); int ohm; switch (type) { case hwmon_temp: switch (attr) { case hwmon_temp_input: ohm = ntc_thermistor_get_ohm(data); if (ohm < 0) return ohm; *val = get_temp_mc(data, ohm); return 0; case hwmon_temp_type: *val = 4; return 0; default: break; } break; default: break; } return -EINVAL; } static umode_t ntc_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { if (type == hwmon_temp) { switch (attr) { case hwmon_temp_input: case hwmon_temp_type: return 0444; default: break; } } return 0; } static const struct hwmon_channel_info *ntc_info[] = { HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_TYPE), NULL }; static const struct hwmon_ops ntc_hwmon_ops = { .is_visible = ntc_is_visible, .read = ntc_read, }; static const struct hwmon_chip_info ntc_chip_info = { .ops = &ntc_hwmon_ops, .info = ntc_info, }; static int ntc_thermistor_parse_dt(struct device *dev, struct ntc_data *data) { struct iio_channel *chan; enum iio_chan_type type; struct device_node *np = dev->of_node; int ret; chan = devm_iio_channel_get(dev, NULL); if (IS_ERR(chan)) return PTR_ERR(chan); ret = iio_get_channel_type(chan, &type); if (ret < 0) return ret; if (type != IIO_VOLTAGE) return -EINVAL; if (of_property_read_u32(np, "pullup-uv", &data->pullup_uv)) return -ENODEV; if (of_property_read_u32(np, "pullup-ohm", &data->pullup_ohm)) return -ENODEV; if (of_property_read_u32(np, "pulldown-ohm", &data->pulldown_ohm)) return -ENODEV; if (of_find_property(np, "connected-positive", NULL)) data->connect = NTC_CONNECTED_POSITIVE; else /* status change should be possible if not always on. */ data->connect = NTC_CONNECTED_GROUND; data->chan = chan; return 0; } static int ntc_thermistor_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; const struct of_device_id *of_id = of_match_device(of_match_ptr(ntc_match), dev); const struct platform_device_id *pdev_id; struct device *hwmon_dev; struct ntc_data *data; int ret; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; ret = ntc_thermistor_parse_dt(dev, data); if (ret) return ret; if (data->pullup_uv == 0 || (data->pullup_ohm == 0 && data->connect == NTC_CONNECTED_GROUND) || (data->pulldown_ohm == 0 && data->connect == NTC_CONNECTED_POSITIVE) || (data->connect != NTC_CONNECTED_POSITIVE && data->connect != NTC_CONNECTED_GROUND)) { dev_err(dev, "Required data to use NTC driver not supplied.\n"); return -EINVAL; } pdev_id = of_id ? of_id->data : platform_get_device_id(pdev); if (pdev_id->driver_data >= ARRAY_SIZE(ntc_type)) { dev_err(dev, "Unknown device type: %lu(%s)\n", pdev_id->driver_data, pdev_id->name); return -EINVAL; } data->comp = ntc_type[pdev_id->driver_data].comp; data->n_comp = ntc_type[pdev_id->driver_data].n_comp; hwmon_dev = devm_hwmon_device_register_with_info(dev, pdev_id->name, data, &ntc_chip_info, NULL); if (IS_ERR(hwmon_dev)) { dev_err(dev, "unable to register as hwmon device.\n"); return PTR_ERR(hwmon_dev); } dev_info(dev, "Thermistor type: %s successfully probed.\n", pdev_id->name); return 0; } static struct platform_driver ntc_thermistor_driver = { .driver = { .name = "ntc-thermistor", .of_match_table = of_match_ptr(ntc_match), }, .probe = ntc_thermistor_probe, .id_table = ntc_thermistor_id, }; module_platform_driver(ntc_thermistor_driver); MODULE_DESCRIPTION("NTC Thermistor Driver"); MODULE_AUTHOR("MyungJoo Ham "); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:ntc-thermistor");