diff options
Diffstat (limited to 'drivers/iio/temperature/maxim_thermocouple.c')
| -rw-r--r-- | drivers/iio/temperature/maxim_thermocouple.c | 138 |
1 files changed, 83 insertions, 55 deletions
diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c index c31b9633f32d..205939680fd4 100644 --- a/drivers/iio/temperature/maxim_thermocouple.c +++ b/drivers/iio/temperature/maxim_thermocouple.c @@ -6,12 +6,14 @@ * Author: <matt.ranostay@konsulko.com> */ -#include <linux/module.h> #include <linux/init.h> -#include <linux/mutex.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> #include <linux/err.h> #include <linux/spi/spi.h> +#include <linux/types.h> #include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> #include <linux/iio/trigger.h> #include <linux/iio/buffer.h> #include <linux/iio/triggered_buffer.h> @@ -22,13 +24,25 @@ enum { MAX6675, MAX31855, + MAX31855K, + MAX31855J, + MAX31855N, + MAX31855S, + MAX31855T, + MAX31855E, + MAX31855R, +}; + +static const char maxim_tc_types[] = { + 'K', '?', 'K', 'J', 'N', 'S', 'T', 'E', 'R' }; static const struct iio_chan_spec max6675_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), .scan_index = 0, .scan_type = { .sign = 's', @@ -46,7 +60,8 @@ static const struct iio_chan_spec max31855_channels[] = { .type = IIO_TEMP, .address = 2, .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), .scan_index = 0, .scan_type = { .sign = 's', @@ -106,8 +121,16 @@ static const struct maxim_thermocouple_chip maxim_thermocouple_chips[] = { struct maxim_thermocouple_data { struct spi_device *spi; const struct maxim_thermocouple_chip *chip; - - u8 buffer[16] ____cacheline_aligned; + char tc_type; + /* Buffer for reading up to 2 hardware channels. */ + struct { + union { + __be16 raw16; + __be32 raw32; + __be16 raw[2]; + }; + aligned_s64 timestamp; + } buffer __aligned(IIO_DMA_MINALIGN); }; static int maxim_thermocouple_read(struct maxim_thermocouple_data *data, @@ -115,18 +138,16 @@ static int maxim_thermocouple_read(struct maxim_thermocouple_data *data, { unsigned int storage_bytes = data->chip->read_size; unsigned int shift = chan->scan_type.shift + (chan->address * 8); - __be16 buf16; - __be32 buf32; int ret; switch (storage_bytes) { case 2: - ret = spi_read(data->spi, (void *)&buf16, storage_bytes); - *val = be16_to_cpu(buf16); + ret = spi_read(data->spi, &data->buffer.raw16, storage_bytes); + *val = be16_to_cpu(data->buffer.raw16); break; case 4: - ret = spi_read(data->spi, (void *)&buf32, storage_bytes); - *val = be32_to_cpu(buf32); + ret = spi_read(data->spi, &data->buffer.raw32, storage_bytes); + *val = be32_to_cpu(data->buffer.raw32); break; default: ret = -EINVAL; @@ -151,10 +172,11 @@ static irqreturn_t maxim_thermocouple_trigger_handler(int irq, void *private) struct maxim_thermocouple_data *data = iio_priv(indio_dev); int ret; - ret = spi_read(data->spi, data->buffer, data->chip->read_size); + ret = spi_read(data->spi, data->buffer.raw, data->chip->read_size); if (!ret) { - iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, - iio_get_time_ns(indio_dev)); + iio_push_to_buffers_with_ts(indio_dev, &data->buffer, + sizeof(data->buffer), + iio_get_time_ns(indio_dev)); } iio_trigger_notify_done(indio_dev->trig); @@ -167,36 +189,35 @@ static int maxim_thermocouple_read_raw(struct iio_dev *indio_dev, int *val, int *val2, long mask) { struct maxim_thermocouple_data *data = iio_priv(indio_dev); - int ret = -EINVAL; + int ret; switch (mask) { case IIO_CHAN_INFO_RAW: - ret = iio_device_claim_direct_mode(indio_dev); - if (ret) - return ret; + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; ret = maxim_thermocouple_read(data, chan, val); - iio_device_release_direct_mode(indio_dev); - - if (!ret) - return IIO_VAL_INT; + iio_device_release_direct(indio_dev); + if (ret) + return ret; - break; + return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: switch (chan->channel2) { case IIO_MOD_TEMP_AMBIENT: *val = 62; *val2 = 500000; /* 1000 * 0.0625 */ - ret = IIO_VAL_INT_PLUS_MICRO; - break; + return IIO_VAL_INT_PLUS_MICRO; default: *val = 250; /* 1000 * 0.25 */ - ret = IIO_VAL_INT; - }; - break; + return IIO_VAL_INT; + } + case IIO_CHAN_INFO_THERMOCOUPLE_TYPE: + *val = data->tc_type; + return IIO_VAL_CHAR; + default: + return -EINVAL; } - - return ret; } static const struct iio_info maxim_thermocouple_info = { @@ -208,8 +229,9 @@ static int maxim_thermocouple_probe(struct spi_device *spi) const struct spi_device_id *id = spi_get_device_id(spi); struct iio_dev *indio_dev; struct maxim_thermocouple_data *data; + const int chip_type = (id->driver_data == MAX6675) ? MAX6675 : MAX31855; const struct maxim_thermocouple_chip *chip = - &maxim_thermocouple_chips[id->driver_data]; + &maxim_thermocouple_chips[chip_type]; int ret; indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data)); @@ -222,52 +244,58 @@ static int maxim_thermocouple_probe(struct spi_device *spi) indio_dev->available_scan_masks = chip->scan_masks; indio_dev->num_channels = chip->num_channels; indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->dev.parent = &spi->dev; data = iio_priv(indio_dev); data->spi = spi; data->chip = chip; + data->tc_type = maxim_tc_types[id->driver_data]; - ret = iio_triggered_buffer_setup(indio_dev, NULL, + ret = devm_iio_triggered_buffer_setup(&spi->dev, + indio_dev, NULL, maxim_thermocouple_trigger_handler, NULL); if (ret) return ret; - ret = iio_device_register(indio_dev); - if (ret) - goto error_unreg_buffer; - - return 0; - -error_unreg_buffer: - iio_triggered_buffer_cleanup(indio_dev); + if (id->driver_data == MAX31855) + dev_warn(&spi->dev, "generic max31855 ID is deprecated\nplease use more specific part type"); - return ret; -} - -static int maxim_thermocouple_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - - iio_device_unregister(indio_dev); - iio_triggered_buffer_cleanup(indio_dev); - - return 0; + return devm_iio_device_register(&spi->dev, indio_dev); } static const struct spi_device_id maxim_thermocouple_id[] = { {"max6675", MAX6675}, {"max31855", MAX31855}, - {}, + {"max31855k", MAX31855K}, + {"max31855j", MAX31855J}, + {"max31855n", MAX31855N}, + {"max31855s", MAX31855S}, + {"max31855t", MAX31855T}, + {"max31855e", MAX31855E}, + {"max31855r", MAX31855R}, + { } }; MODULE_DEVICE_TABLE(spi, maxim_thermocouple_id); +static const struct of_device_id maxim_thermocouple_of_match[] = { + { .compatible = "maxim,max6675" }, + { .compatible = "maxim,max31855" }, + { .compatible = "maxim,max31855k" }, + { .compatible = "maxim,max31855j" }, + { .compatible = "maxim,max31855n" }, + { .compatible = "maxim,max31855s" }, + { .compatible = "maxim,max31855t" }, + { .compatible = "maxim,max31855e" }, + { .compatible = "maxim,max31855r" }, + { }, +}; +MODULE_DEVICE_TABLE(of, maxim_thermocouple_of_match); + static struct spi_driver maxim_thermocouple_driver = { .driver = { .name = MAXIM_THERMOCOUPLE_DRV_NAME, + .of_match_table = maxim_thermocouple_of_match, }, .probe = maxim_thermocouple_probe, - .remove = maxim_thermocouple_remove, .id_table = maxim_thermocouple_id, }; module_spi_driver(maxim_thermocouple_driver); |