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kernel/drivers/hwmon/ntc_thermistor.c
Krzysztof Kozlowski 9add51f2bc hwmon: ntc_thermistor: constify pointers to hwmon_channel_info 
Statically allocated array of pointed to hwmon_channel_info can be made
const for safety.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2023-04-19 07:08:37 -07:00

708 lines
20 KiB
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ntc_thermistor.c - NTC Thermistors
*
* Copyright (C) 2010 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/math64.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/err.h>
#include <linux/fixp-arith.h>
#include <linux/iio/consumer.h>
#include <linux/hwmon.h>
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_SSG1404001221,
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_SSG1404001221] = { "ssg1404_001221", 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 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 * const 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_props(struct device *dev,
struct ntc_data *data)
{
struct iio_channel *chan;
enum iio_chan_type type;
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;
ret = device_property_read_u32(dev, "pullup-uv", &data->pullup_uv);
if (ret)
return dev_err_probe(dev, ret, "pullup-uv not specified\n");
ret = device_property_read_u32(dev, "pullup-ohm", &data->pullup_ohm);
if (ret)
return dev_err_probe(dev, ret, "pullup-ohm not specified\n");
ret = device_property_read_u32(dev, "pulldown-ohm", &data->pulldown_ohm);
if (ret)
return dev_err_probe(dev, ret, "pulldown-ohm not specified\n");
if (device_property_read_bool(dev, "connected-positive"))
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 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_props(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 = device_get_match_data(dev);
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 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] },
{ .compatible = "samsung,1404-001221",
.data = &ntc_thermistor_id[NTC_SSG1404001221] },
/* 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 struct platform_driver ntc_thermistor_driver = {
.driver = {
.name = "ntc-thermistor",
.of_match_table = 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 <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ntc-thermistor");
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