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path: root/drivers/hwmon/ntc_thermistor.c
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Diffstat (limited to 'drivers/hwmon/ntc_thermistor.c')
-rw-r--r--drivers/hwmon/ntc_thermistor.c109
1 files changed, 48 insertions, 61 deletions
diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c
index cedb3ee0f762..ed638ebd0923 100644
--- a/drivers/hwmon/ntc_thermistor.c
+++ b/drivers/hwmon/ntc_thermistor.c
@@ -26,25 +26,6 @@ enum ntc_thermistor_type {
TYPE_NCPXXXH103,
};
-struct ntc_thermistor_platform_data {
- /*
- * 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.
- */
- unsigned int pullup_uv;
- unsigned int pullup_ohm;
- unsigned int pulldown_ohm;
- enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect;
- struct iio_channel *chan;
-};
-
struct ntc_compensation {
int temp_c;
unsigned int ohm;
@@ -337,15 +318,30 @@ static const struct ntc_type ntc_type[] = {
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 {
- struct ntc_thermistor_platform_data *pdata;
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_thermistor_platform_data *pdata)
+static int ntc_adc_iio_read(struct ntc_data *data)
{
- struct iio_channel *channel = pdata->chan;
+ struct iio_channel *channel = data->chan;
int uv, ret;
ret = iio_read_channel_processed_scale(channel, &uv, 1000);
@@ -365,7 +361,7 @@ static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000);
if (ret < 0) {
/* Assume 12 bit ADC with vref at pullup_uv */
- uv = (pdata->pullup_uv * (s64)raw) >> 12;
+ uv = (data->pullup_uv * (s64)raw) >> 12;
}
}
@@ -407,20 +403,19 @@ static const struct of_device_id ntc_match[] = {
};
MODULE_DEVICE_TABLE(of, ntc_match);
-static struct ntc_thermistor_platform_data *
-ntc_thermistor_parse_dt(struct device *dev)
+static struct ntc_data *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;
- struct ntc_thermistor_platform_data *pdata;
int ret;
if (!np)
return NULL;
- pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
return ERR_PTR(-ENOMEM);
chan = devm_iio_channel_get(dev, NULL);
@@ -434,21 +429,21 @@ ntc_thermistor_parse_dt(struct device *dev)
if (type != IIO_VOLTAGE)
return ERR_PTR(-EINVAL);
- if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv))
+ if (of_property_read_u32(np, "pullup-uv", &data->pullup_uv))
return ERR_PTR(-ENODEV);
- if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm))
+ if (of_property_read_u32(np, "pullup-ohm", &data->pullup_ohm))
return ERR_PTR(-ENODEV);
- if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm))
+ if (of_property_read_u32(np, "pulldown-ohm", &data->pulldown_ohm))
return ERR_PTR(-ENODEV);
if (of_find_property(np, "connected-positive", NULL))
- pdata->connect = NTC_CONNECTED_POSITIVE;
+ data->connect = NTC_CONNECTED_POSITIVE;
else /* status change should be possible if not always on. */
- pdata->connect = NTC_CONNECTED_GROUND;
+ data->connect = NTC_CONNECTED_GROUND;
- pdata->chan = chan;
+ data->chan = chan;
- return pdata;
+ return data;
}
static inline u64 div64_u64_safe(u64 dividend, u64 divisor)
@@ -462,24 +457,23 @@ 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;
- u32 puv = pdata->pullup_uv;
+ u32 puv = data->pullup_uv;
u64 n, puo, pdo;
- puo = pdata->pullup_ohm;
- pdo = pdata->pulldown_ohm;
+ puo = data->pullup_ohm;
+ pdo = data->pulldown_ohm;
if (uv == 0)
- return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
+ return (data->connect == NTC_CONNECTED_POSITIVE) ?
INT_MAX : 0;
if (uv >= puv)
- return (pdata->connect == NTC_CONNECTED_POSITIVE) ?
+ return (data->connect == NTC_CONNECTED_POSITIVE) ?
0 : INT_MAX;
- if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0)
+ if (data->connect == NTC_CONNECTED_POSITIVE && puo == 0)
n = div_u64(pdo * (puv - uv), uv);
- else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0)
+ else if (data->connect == NTC_CONNECTED_GROUND && pdo == 0)
n = div_u64(puo * uv, puv - uv);
- else if (pdata->connect == NTC_CONNECTED_POSITIVE)
+ else if (data->connect == NTC_CONNECTED_POSITIVE)
n = div64_u64_safe(pdo * puo * (puv - uv),
puo * uv - pdo * (puv - uv));
else
@@ -579,7 +573,7 @@ static int ntc_thermistor_get_ohm(struct ntc_data *data)
{
int read_uv;
- read_uv = ntc_adc_iio_read(data->pdata);
+ read_uv = ntc_adc_iio_read(data);
if (read_uv < 0)
return read_uv;
return get_ohm_of_thermistor(data, read_uv);
@@ -650,38 +644,31 @@ static int ntc_thermistor_probe(struct platform_device *pdev)
const struct of_device_id *of_id =
of_match_device(of_match_ptr(ntc_match), dev);
const struct platform_device_id *pdev_id;
- struct ntc_thermistor_platform_data *pdata;
struct device *hwmon_dev;
struct ntc_data *data;
- pdata = ntc_thermistor_parse_dt(dev);
- if (IS_ERR(pdata))
- return PTR_ERR(pdata);
+ data = ntc_thermistor_parse_dt(dev);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
- if (!pdata) {
+ if (!data) {
dev_err(dev, "No platform init data supplied.\n");
return -ENODEV;
}
- if (pdata->pullup_uv == 0 ||
- (pdata->pullup_ohm == 0 && pdata->connect ==
+ if (data->pullup_uv == 0 ||
+ (data->pullup_ohm == 0 && data->connect ==
NTC_CONNECTED_GROUND) ||
- (pdata->pulldown_ohm == 0 && pdata->connect ==
+ (data->pulldown_ohm == 0 && data->connect ==
NTC_CONNECTED_POSITIVE) ||
- (pdata->connect != NTC_CONNECTED_POSITIVE &&
- pdata->connect != NTC_CONNECTED_GROUND)) {
+ (data->connect != NTC_CONNECTED_POSITIVE &&
+ data->connect != NTC_CONNECTED_GROUND)) {
dev_err(dev, "Required data to use NTC driver not supplied.\n");
return -EINVAL;
}
- data = devm_kzalloc(dev, sizeof(struct ntc_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
-
pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);
- data->pdata = pdata;
-
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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 11:41:39 +0000