diff options
Diffstat (limited to 'drivers/iio/temperature/max31856.c')
| -rw-r--r-- | drivers/iio/temperature/max31856.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/iio/temperature/max31856.c b/drivers/iio/temperature/max31856.c index 8457ca9ae326..b4cb21ab2e85 100644 --- a/drivers/iio/temperature/max31856.c +++ b/drivers/iio/temperature/max31856.c @@ -6,6 +6,7 @@ * Copyright (C) 2018-2019 Rockwell Collins */ +#include <linux/ctype.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> @@ -53,7 +54,8 @@ static const struct iio_chan_spec max31856_channels[] = { { /* Thermocouple Temperature */ .type = IIO_TEMP, .info_mask_separate = - BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE), .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) }, @@ -75,6 +77,10 @@ struct max31856_data { int averaging; }; +static const char max31856_tc_types[] = { + 'B', 'E', 'J', 'K', 'N', 'R', 'S', 'T' +}; + static int max31856_read(struct max31856_data *data, u8 reg, u8 val[], unsigned int read_size) { @@ -232,6 +238,9 @@ static int max31856_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *val = 1 << data->averaging; return IIO_VAL_INT; + case IIO_CHAN_INFO_THERMOCOUPLE_TYPE: + *val = max31856_tc_types[data->thermocouple_type]; + return IIO_VAL_CHAR; default: ret = -EINVAL; break; @@ -240,6 +249,18 @@ static int max31856_read_raw(struct iio_dev *indio_dev, return ret; } +static int max31856_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_THERMOCOUPLE_TYPE: + return IIO_VAL_CHAR; + default: + return IIO_VAL_INT; + } +} + static int max31856_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) @@ -259,7 +280,24 @@ static int max31856_write_raw(struct iio_dev *indio_dev, data->averaging = msb; max31856_init(data); break; + case IIO_CHAN_INFO_THERMOCOUPLE_TYPE: + { + int tc_type = -1; + int i; + + for (i = 0; i < ARRAY_SIZE(max31856_tc_types); i++) { + if (max31856_tc_types[i] == toupper(val)) { + tc_type = i; + break; + } + } + if (tc_type < 0) + return -EINVAL; + data->thermocouple_type = tc_type; + max31856_init(data); + break; + } default: return -EINVAL; } @@ -356,6 +394,7 @@ static const struct attribute_group max31856_group = { static const struct iio_info max31856_info = { .read_raw = max31856_read_raw, .write_raw = max31856_write_raw, + .write_raw_get_fmt = max31856_write_raw_get_fmt, .attrs = &max31856_group, }; |