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Diffstat (limited to 'drivers/hwmon/ntc_thermistor.c')
-rw-r--r--drivers/hwmon/ntc_thermistor.c752
1 files changed, 483 insertions, 269 deletions
diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c
index 830a842d796a..d6b48178343d 100644
--- a/drivers/hwmon/ntc_thermistor.c
+++ b/drivers/hwmon/ntc_thermistor.c
@@ -1,57 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ntc_thermistor.c - NTC Thermistors
*
* Copyright (C) 2010 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
*/
#include <linux/slab.h>
#include <linux/module.h>
-#include <linux/pm_runtime.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/of.h>
-#include <linux/of_device.h>
-
-#include <linux/platform_data/ntc_thermistor.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/machine.h>
-#include <linux/iio/driver.h>
+#include <linux/fixp-arith.h>
#include <linux/iio/consumer.h>
-
#include <linux/hwmon.h>
-#include <linux/hwmon-sysfs.h>
+
+enum ntc_thermistor_type {
+ TYPE_B57330V2103,
+ TYPE_B57891S0103,
+ TYPE_NCPXXWB473,
+ TYPE_NCPXXWF104,
+ TYPE_NCPXXWL333,
+ TYPE_NCPXXXH103,
+ TYPE_NCPXXWM474,
+};
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_NCP18WM474,
+ NTC_LAST,
+};
+
static const struct platform_device_id ntc_thermistor_id[] = {
- { "ncp15wb473", TYPE_NCPXXWB473 },
- { "ncp18wb473", TYPE_NCPXXWB473 },
- { "ncp21wb473", TYPE_NCPXXWB473 },
- { "ncp03wb473", TYPE_NCPXXWB473 },
- { "ncp15wl333", TYPE_NCPXXWL333 },
- { },
+ [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_NCP18WM474] = { "ncp18wm474", TYPE_NCPXXWM474 },
+ [NTC_LAST] = { },
};
+MODULE_DEVICE_TABLE(platform, ntc_thermistor_id);
/*
* A compensation table should be sorted by the values of .ohm
@@ -132,101 +146,272 @@ static const struct ntc_compensation ncpXXwl333[] = {
{ .temp_c = 125, .ohm = 707 },
};
-struct ntc_data {
- struct device *hwmon_dev;
- struct ntc_thermistor_platform_data *pdata;
- const struct ntc_compensation *comp;
- struct device *dev;
- int n_comp;
- char name[PLATFORM_NAME_SIZE];
+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 },
};
-#ifdef CONFIG_OF
-static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
-{
- struct iio_channel *channel = pdata->chan;
- unsigned int result;
- int val, ret;
-
- ret = iio_read_channel_raw(channel, &val);
- if (ret < 0) {
- pr_err("read channel() error: %d\n", ret);
- return ret;
- }
-
- /* unit: mV */
- result = pdata->pullup_uv * val;
- result >>= 12;
+static const struct ntc_compensation ncpXXxh103[] = {
+ { .temp_c = -40, .ohm = 195652 },
+ { .temp_c = -35, .ohm = 148171 },
+ { .temp_c = -30, .ohm = 113347 },
+ { .temp_c = -25, .ohm = 87559 },
+ { .temp_c = -20, .ohm = 68237 },
+ { .temp_c = -15, .ohm = 53650 },
+ { .temp_c = -10, .ohm = 42506 },
+ { .temp_c = -5, .ohm = 33892 },
+ { .temp_c = 0, .ohm = 27219 },
+ { .temp_c = 5, .ohm = 22021 },
+ { .temp_c = 10, .ohm = 17926 },
+ { .temp_c = 15, .ohm = 14674 },
+ { .temp_c = 20, .ohm = 12081 },
+ { .temp_c = 25, .ohm = 10000 },
+ { .temp_c = 30, .ohm = 8315 },
+ { .temp_c = 35, .ohm = 6948 },
+ { .temp_c = 40, .ohm = 5834 },
+ { .temp_c = 45, .ohm = 4917 },
+ { .temp_c = 50, .ohm = 4161 },
+ { .temp_c = 55, .ohm = 3535 },
+ { .temp_c = 60, .ohm = 3014 },
+ { .temp_c = 65, .ohm = 2586 },
+ { .temp_c = 70, .ohm = 2228 },
+ { .temp_c = 75, .ohm = 1925 },
+ { .temp_c = 80, .ohm = 1669 },
+ { .temp_c = 85, .ohm = 1452 },
+ { .temp_c = 90, .ohm = 1268 },
+ { .temp_c = 95, .ohm = 1110 },
+ { .temp_c = 100, .ohm = 974 },
+ { .temp_c = 105, .ohm = 858 },
+ { .temp_c = 110, .ohm = 758 },
+ { .temp_c = 115, .ohm = 672 },
+ { .temp_c = 120, .ohm = 596 },
+ { .temp_c = 125, .ohm = 531 },
+};
- return result;
-}
+static const struct ntc_compensation ncpXXwm474[] = {
+ { .temp_c = -40, .ohm = 10900000 },
+ { .temp_c = -35, .ohm = 9600000 },
+ { .temp_c = -30, .ohm = 8300000 },
+ { .temp_c = -25, .ohm = 7000000 },
+ { .temp_c = -20, .ohm = 5980000 },
+ { .temp_c = -15, .ohm = 4960000 },
+ { .temp_c = -10, .ohm = 3940000 },
+ { .temp_c = -5, .ohm = 2920000 },
+ { .temp_c = 0, .ohm = 1900000 },
+ { .temp_c = 5, .ohm = 1614000 },
+ { .temp_c = 10, .ohm = 1328000 },
+ { .temp_c = 15, .ohm = 1042000 },
+ { .temp_c = 20, .ohm = 756000 },
+ { .temp_c = 25, .ohm = 470000 },
+ { .temp_c = 30, .ohm = 404000 },
+ { .temp_c = 35, .ohm = 338000 },
+ { .temp_c = 40, .ohm = 272000 },
+ { .temp_c = 45, .ohm = 206000 },
+ { .temp_c = 50, .ohm = 140000 },
+ { .temp_c = 55, .ohm = 122000 },
+ { .temp_c = 60, .ohm = 104000 },
+ { .temp_c = 65, .ohm = 86000 },
+ { .temp_c = 70, .ohm = 68000 },
+ { .temp_c = 75, .ohm = 50000 },
+ { .temp_c = 80, .ohm = 44200 },
+ { .temp_c = 85, .ohm = 38400 },
+ { .temp_c = 90, .ohm = 32600 },
+ { .temp_c = 95, .ohm = 26800 },
+ { .temp_c = 100, .ohm = 21000 },
+ { .temp_c = 105, .ohm = 18600 },
+ { .temp_c = 110, .ohm = 16200 },
+ { .temp_c = 115, .ohm = 13800 },
+ { .temp_c = 120, .ohm = 11400 },
+ { .temp_c = 125, .ohm = 9000 },
+};
-static const struct of_device_id ntc_match[] = {
- { .compatible = "ntc,ncp15wb473",
- .data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
- { .compatible = "ntc,ncp18wb473",
- .data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
- { .compatible = "ntc,ncp21wb473",
- .data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
- { .compatible = "ntc,ncp03wb473",
- .data = &ntc_thermistor_id[TYPE_NCPXXWB473] },
- { .compatible = "ntc,ncp15wl333",
- .data = &ntc_thermistor_id[TYPE_NCPXXWL333] },
- { },
+/*
+ * 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 },
};
-MODULE_DEVICE_TABLE(of, ntc_match);
-static struct ntc_thermistor_platform_data *
-ntc_thermistor_parse_dt(struct platform_device *pdev)
-{
- struct iio_channel *chan;
- struct device_node *np = pdev->dev.of_node;
- struct ntc_thermistor_platform_data *pdata;
+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 },
+};
- if (!np)
- return NULL;
+struct ntc_type {
+ const struct ntc_compensation *comp;
+ int n_comp;
+};
- pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
- return ERR_PTR(-ENOMEM);
+#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),
+ NTC_TYPE(TYPE_NCPXXWM474, ncpXXwm474),
+};
- chan = iio_channel_get(&pdev->dev, NULL);
- if (IS_ERR(chan))
- return ERR_CAST(chan);
+/*
+ * 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;
+};
- if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
- return ERR_PTR(-ENODEV);
- if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm))
- return ERR_PTR(-ENODEV);
- if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm))
- return ERR_PTR(-ENODEV);
+static int ntc_adc_iio_read(struct ntc_data *data)
+{
+ struct iio_channel *channel = data->chan;
+ int uv, ret;
- if (of_find_property(np, "connected-positive", NULL))
- pdata->connect = NTC_CONNECTED_POSITIVE;
- else /* status change should be possible if not always on. */
- pdata->connect = NTC_CONNECTED_GROUND;
+ ret = iio_read_channel_processed_scale(channel, &uv, 1000);
+ if (ret < 0) {
+ int raw;
- pdata->chan = chan;
- pdata->read_uv = ntc_adc_iio_read;
+ /*
+ * 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 pdata;
-}
-static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)
-{
- if (pdata->chan)
- iio_channel_release(pdata->chan);
-}
-#else
-static struct ntc_thermistor_platform_data *
-ntc_thermistor_parse_dt(struct platform_device *pdev)
-{
- return NULL;
+ return uv;
}
-static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)
-{ }
-#endif
-
static inline u64 div64_u64_safe(u64 dividend, u64 divisor)
{
if (divisor == 0 && dividend == 0)
@@ -238,34 +423,29 @@ static inline u64 div64_u64_safe(u64 dividend, u64 divisor)
static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv)
{
- struct ntc_thermistor_platform_data *pdata = data->pdata;
- u64 mv = uv / 1000;
- u64 pmv = pdata->pullup_uv / 1000;
+ u32 puv = data->pullup_uv;
u64 n, puo, pdo;
- puo = pdata->pullup_ohm;
- pdo = pdata->pulldown_ohm;
-
- if (mv == 0) {
- if (pdata->connect == NTC_CONNECTED_POSITIVE)
- return INT_MAX;
- return 0;
- }
- if (mv >= pmv)
- return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
- 0 : INT_MAX;
-
- if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0)
- n = div64_u64_safe(pdo * (pmv - mv), mv);
- else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0)
- n = div64_u64_safe(puo * mv, pmv - mv);
- else if (pdata->connect == NTC_CONNECTED_POSITIVE)
- n = div64_u64_safe(pdo * puo * (pmv - mv),
- puo * mv - pdo * (pmv - mv));
+ puo = data->pullup_ohm;
+ pdo = data->pulldown_ohm;
+
+ /* faulty adc value */
+ if (uv == 0 || uv >= puv)
+ return -ENODATA;
+
+ 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 * mv, pdo * (pmv - mv) - puo * mv);
+ n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv);
+
+ /* sensor out of bounds */
+ if (n > data->comp[0].ohm || n < data->comp[data->n_comp - 1].ohm)
+ return -ENODATA;
- if (n > INT_MAX)
- n = INT_MAX;
return n;
}
@@ -341,15 +521,16 @@ static int get_temp_mc(struct ntc_data *data, unsigned int ohm)
int temp;
lookup_comp(data, ohm, &low, &high);
- if (low == high) {
- /* Unable to use linear approximation */
- temp = data->comp[low].temp_c * 1000;
- } else {
- temp = data->comp[low].temp_c * 1000 +
- ((data->comp[high].temp_c - data->comp[low].temp_c) *
- 1000 * ((int)ohm - (int)data->comp[low].ohm)) /
- ((int)data->comp[high].ohm - (int)data->comp[low].ohm);
- }
+ /*
+ * 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;
}
@@ -357,175 +538,208 @@ static int ntc_thermistor_get_ohm(struct ntc_data *data)
{
int read_uv;
- if (data->pdata->read_ohm)
- return data->pdata->read_ohm();
-
- if (data->pdata->read_uv) {
- read_uv = data->pdata->read_uv(data->pdata);
- if (read_uv < 0)
- return read_uv;
- return get_ohm_of_thermistor(data, read_uv);
- }
- return -EINVAL;
+ read_uv = ntc_adc_iio_read(data);
+ if (read_uv < 0)
+ return read_uv;
+ return get_ohm_of_thermistor(data, read_uv);
}
-static ssize_t ntc_show_name(struct device *dev,
- struct device_attribute *attr, char *buf)
+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;
- return sprintf(buf, "%s\n", data->name);
-}
-
-static ssize_t ntc_show_type(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- return sprintf(buf, "4\n");
+ 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 ssize_t ntc_show_temp(struct device *dev,
- struct device_attribute *attr, char *buf)
+static umode_t ntc_is_visible(const void *data, enum hwmon_sensor_types type,
+ u32 attr, int channel)
{
- struct ntc_data *data = dev_get_drvdata(dev);
- int ohm;
-
- ohm = ntc_thermistor_get_ohm(data);
- if (ohm < 0)
- return ohm;
-
- return sprintf(buf, "%d\n", get_temp_mc(data, ohm));
+ if (type == hwmon_temp) {
+ switch (attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_type:
+ return 0444;
+ default:
+ break;
+ }
+ }
+ return 0;
}
-static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0);
-static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ntc_show_temp, NULL, 0);
-static DEVICE_ATTR(name, S_IRUGO, ntc_show_name, NULL);
+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 struct attribute *ntc_attributes[] = {
- &dev_attr_name.attr,
- &sensor_dev_attr_temp1_type.dev_attr.attr,
- &sensor_dev_attr_temp1_input.dev_attr.attr,
- NULL,
+static const struct hwmon_ops ntc_hwmon_ops = {
+ .is_visible = ntc_is_visible,
+ .read = ntc_read,
};
-static const struct attribute_group ntc_attr_group = {
- .attrs = ntc_attributes,
+static const struct hwmon_chip_info ntc_chip_info = {
+ .ops = &ntc_hwmon_ops,
+ .info = ntc_info,
};
-static int ntc_thermistor_probe(struct platform_device *pdev)
+static int ntc_thermistor_parse_props(struct device *dev,
+ struct ntc_data *data)
{
- const struct of_device_id *of_id =
- of_match_device(of_match_ptr(ntc_match), &pdev->dev);
- const struct platform_device_id *pdev_id;
- struct ntc_thermistor_platform_data *pdata;
- struct ntc_data *data;
+ struct iio_channel *chan;
+ enum iio_chan_type type;
int ret;
- pdata = ntc_thermistor_parse_dt(pdev);
- if (IS_ERR(pdata))
- return PTR_ERR(pdata);
- else if (pdata == NULL)
- pdata = pdev->dev.platform_data;
+ chan = devm_iio_channel_get(dev, NULL);
+ if (IS_ERR(chan))
+ return PTR_ERR(chan);
- if (!pdata) {
- dev_err(&pdev->dev, "No platform init data supplied.\n");
- return -ENODEV;
- }
+ ret = iio_get_channel_type(chan, &type);
+ if (ret < 0)
+ return ret;
- /* Either one of the two is required. */
- if (!pdata->read_uv && !pdata->read_ohm) {
- dev_err(&pdev->dev,
- "Both read_uv and read_ohm missing. Need either one of the two.\n");
+ if (type != IIO_VOLTAGE)
return -EINVAL;
- }
- if (pdata->read_uv && pdata->read_ohm) {
- dev_warn(&pdev->dev,
- "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n");
- pdata->read_uv = NULL;
- }
+ ret = device_property_read_u32(dev, "pullup-uv", &data->pullup_uv);
+ if (ret)
+ return dev_err_probe(dev, ret, "pullup-uv not specified\n");
- if (pdata->read_uv && (pdata->pullup_uv == 0 ||
- (pdata->pullup_ohm == 0 && pdata->connect ==
- NTC_CONNECTED_GROUND) ||
- (pdata->pulldown_ohm == 0 && pdata->connect ==
- NTC_CONNECTED_POSITIVE) ||
- (pdata->connect != NTC_CONNECTED_POSITIVE &&
- pdata->connect != NTC_CONNECTED_GROUND))) {
- dev_err(&pdev->dev,
- "Required data to use read_uv not supplied.\n");
- return -EINVAL;
- }
+ 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(&pdev->dev, sizeof(struct ntc_data), GFP_KERNEL);
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
- pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);
-
- data->dev = &pdev->dev;
- data->pdata = pdata;
- strlcpy(data->name, pdev_id->name, sizeof(data->name));
+ ret = ntc_thermistor_parse_props(dev, data);
+ if (ret)
+ return ret;
- switch (pdev_id->driver_data) {
- case TYPE_NCPXXWB473:
- data->comp = ncpXXwb473;
- data->n_comp = ARRAY_SIZE(ncpXXwb473);
- break;
- case TYPE_NCPXXWL333:
- data->comp = ncpXXwl333;
- data->n_comp = ARRAY_SIZE(ncpXXwl333);
- break;
- default:
- dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n",
- pdev_id->driver_data, pdev_id->name);
+ 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;
}
- platform_set_drvdata(pdev, data);
+ pdev_id = device_get_match_data(dev);
- ret = sysfs_create_group(&data->dev->kobj, &ntc_attr_group);
- if (ret) {
- dev_err(data->dev, "unable to create sysfs files\n");
- return ret;
+ 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->hwmon_dev = hwmon_device_register(data->dev);
- if (IS_ERR(data->hwmon_dev)) {
- dev_err(data->dev, "unable to register as hwmon device.\n");
- ret = PTR_ERR(data->hwmon_dev);
- goto err_after_sysfs;
+ 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(&pdev->dev, "Thermistor type: %s successfully probed.\n",
- pdev->name);
+ dev_info(dev, "Thermistor type: %s successfully probed.\n",
+ pdev_id->name);
return 0;
-err_after_sysfs:
- sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
- ntc_iio_channel_release(pdata);
- return ret;
}
-static int ntc_thermistor_remove(struct platform_device *pdev)
-{
- struct ntc_data *data = platform_get_drvdata(pdev);
- struct ntc_thermistor_platform_data *pdata = data->pdata;
-
- hwmon_device_unregister(data->hwmon_dev);
- sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);
- ntc_iio_channel_release(pdata);
-
- 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] },
+ { .compatible = "murata,ncp18wm474",
+ .data = &ntc_thermistor_id[NTC_NCP18WM474] },
+
+ /* 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",
- .owner = THIS_MODULE,
- .of_match_table = of_match_ptr(ntc_match),
+ .of_match_table = ntc_match,
},
.probe = ntc_thermistor_probe,
- .remove = ntc_thermistor_remove,
.id_table = ntc_thermistor_id,
};
generated by cgit (git 2.34.1) at 2025-12-25 06:17:50 +0000