On Sat, 21 Oct 2023 20:12:03 -0700 Sukrut Bellary <sukrut.bellary@xxxxxxxxx> wrote: > The adcxx4s communicates with a host processor via an SPI/Microwire Bus > interface. The device family responds with 12-bit data, of which the LSB > bits are transmitted by the lower resolution devices as 0. > The unavailable bits are 0 in LSB. > Shift is calculated per resolution and used in scaling and > raw data read. > > Lets reuse the driver to support the family of devices with name > ADC<bb><c>S<sss>, where > * bb is the resolution in number of bits (8, 10, 12) > * c is the number of channels (1, 2, 4, 8) > * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS > and 101 for 1 MSPS) > > Complete datasheets are available at TI's website here: > https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf > > Tested only with ti-adc102s051 on BegalePlay SBC. > https://www.beagleboard.org/boards/beagleplay > > arm64: dts: ti: k3-am625-beagleplay: Add adc102s051 > Add adc102s051 support. > Tested on beaglePlay SBC > https://www.beagleboard.org/boards/beagleplay > > Co-developed-by: Nishanth Menon <nm@xxxxxx> > Signed-off-by: Nishanth Menon <nm@xxxxxx> > Signed-off-by: Sukrut Bellary <sukrut.bellary@xxxxxxxxx> > --- > Changes in v2: > - Arranged of_device_id and spi_device_id in numeric order. > - Used enum to index into adc128_config. > - Reorder adc128_config in alphabetical. > - Include channel resolution information. > - Shift is calculated per resolution and used in scaling and > raw data read. > - Link to v1: https://lore.kernel.org/all/20220701042919.18180-3-nm@xxxxxx/ > --- > drivers/iio/adc/ti-adc128s052.c | 131 +++++++++++++++++++++++--------- > 1 file changed, 96 insertions(+), 35 deletions(-) > > diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c > index a456ea78462f..61e3181b8daf 100644 > --- a/drivers/iio/adc/ti-adc128s052.c > +++ b/drivers/iio/adc/ti-adc128s052.c > @@ -7,6 +7,22 @@ > * https://www.ti.com/lit/ds/symlink/adc128s052.pdf > * https://www.ti.com/lit/ds/symlink/adc122s021.pdf > * https://www.ti.com/lit/ds/symlink/adc124s021.pdf > + * > + * The adcxx4s communicates with a host processor via an SPI/Microwire Bus > + * interface. This driver supports the whole family of devices with a name > + * ADC<bb><c>S<sss>, where > + * bb is the resolution in number of bits (8, 10, 12) > + * c is the number of channels (1, 2, 4, 8) > + * sss is the maximum conversion speed (021 for 200 kSPS, 051 for 500 kSPS > + * and 101 for 1 MSPS) > + * > + * Complete datasheets are available at TI's website here: > + * https://www.ti.com/lit/gpn/adc<bb><c>s<sss>.pdf > + * > + * 8, 10, and 12 bits converters send 12-bit data with > + * unavailable bits set to 0 in LSB. > + * Shift is calculated per resolution and used in scaling and > + * raw data read. > */ > > #include <linux/err.h> > @@ -53,7 +69,7 @@ static int adc128_adc_conversion(struct adc128 *adc, u8 channel) > if (ret < 0) > return ret; > > - return ((adc->buffer[0] << 8 | adc->buffer[1]) & 0xFFF); > + return (adc->buffer[0] << 8 | adc->buffer[1]); Firstly outer brackets don't add anything. Secondly, this is an endian conversion. return be16_to_cpu(adc->buffer); should do the job as we know it's aligned enough for a be16. > } > > static int adc128_read_raw(struct iio_dev *indio_dev, > @@ -70,7 +86,8 @@ static int adc128_read_raw(struct iio_dev *indio_dev, > if (ret < 0) > return ret; > > - *val = ret; > + *val = (ret >> channel->scan_type.shift) & > + GENMASK(channel->scan_type.realbits - 1, 0); > return IIO_VAL_INT; > > case IIO_CHAN_INFO_SCALE: > @@ -80,7 +97,7 @@ static int adc128_read_raw(struct iio_dev *indio_dev, > return ret; > > *val = ret / 1000; > - *val2 = 12; > + *val2 = channel->scan_type.realbits; > return IIO_VAL_FRACTIONAL_LOG2; > > default: > @@ -89,24 +106,34 @@ static int adc128_read_raw(struct iio_dev *indio_dev, > > } > > -#define ADC128_VOLTAGE_CHANNEL(num) \ > - { \ > - .type = IIO_VOLTAGE, \ > - .indexed = 1, \ > - .channel = (num), \ > - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \ > +#define _ADC128_VOLTAGE_CHANNEL(num, real_bits, store_bits) \ > + { \ > + .type = IIO_VOLTAGE, \ > + .indexed = 1, \ > + .channel = (num), \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ > + .scan_index = (num), \ > + .scan_type = { \ > + .sign = 'u', \ > + .realbits = (real_bits), \ > + .storagebits = (store_bits), \ > + .shift = (12 - real_bits), \ > + }, \ > } > > -static const struct iio_chan_spec adc128s052_channels[] = { > - ADC128_VOLTAGE_CHANNEL(0), > - ADC128_VOLTAGE_CHANNEL(1), > - ADC128_VOLTAGE_CHANNEL(2), > - ADC128_VOLTAGE_CHANNEL(3), > - ADC128_VOLTAGE_CHANNEL(4), > - ADC128_VOLTAGE_CHANNEL(5), > - ADC128_VOLTAGE_CHANNEL(6), > - ADC128_VOLTAGE_CHANNEL(7), > +#define ADC082_VOLTAGE_CHANNEL(num) _ADC128_VOLTAGE_CHANNEL(num, 8, 16) > +#define ADC102_VOLTAGE_CHANNEL(num) _ADC128_VOLTAGE_CHANNEL(num, 10, 16) > +#define ADC128_VOLTAGE_CHANNEL(num) _ADC128_VOLTAGE_CHANNEL(num, 12, 16) > + > +static const struct iio_chan_spec adc082s021_channels[] = { > + ADC082_VOLTAGE_CHANNEL(0), > + ADC082_VOLTAGE_CHANNEL(1), > +}; > + > +static const struct iio_chan_spec adc102s021_channels[] = { > + ADC102_VOLTAGE_CHANNEL(0), > + ADC102_VOLTAGE_CHANNEL(1), > }; > > static const struct iio_chan_spec adc122s021_channels[] = { > @@ -121,10 +148,32 @@ static const struct iio_chan_spec adc124s021_channels[] = { > ADC128_VOLTAGE_CHANNEL(3), > }; > > +static const struct iio_chan_spec adc128s052_channels[] = { > + ADC128_VOLTAGE_CHANNEL(0), > + ADC128_VOLTAGE_CHANNEL(1), > + ADC128_VOLTAGE_CHANNEL(2), > + ADC128_VOLTAGE_CHANNEL(3), > + ADC128_VOLTAGE_CHANNEL(4), > + ADC128_VOLTAGE_CHANNEL(5), > + ADC128_VOLTAGE_CHANNEL(6), > + ADC128_VOLTAGE_CHANNEL(7), > +}; > + > static const struct adc128_configuration adc128_config[] = { > - { adc128s052_channels, ARRAY_SIZE(adc128s052_channels) }, > + { adc082s021_channels, ARRAY_SIZE(adc082s021_channels) }, > + { adc102s021_channels, ARRAY_SIZE(adc102s021_channels) }, > { adc122s021_channels, ARRAY_SIZE(adc122s021_channels) }, > { adc124s021_channels, ARRAY_SIZE(adc124s021_channels) }, > + { adc128s052_channels, ARRAY_SIZE(adc128s052_channels) }, > +}; > + > +/* Ensure match with adc128_config indices */ Make sure that is the case by using them when setting it up. static const struct adc128_configuration adc128_config[] { [ADC128_CONFIG_INDEX_082S] = { adc082s021_channels, ARRAY_SIZE(..) }, [ADC128_CONFIG_INDEX_102S] = .. } Or I think you can make it irrelevant by not using an array at all. static const struct ad128_configruation adc082s021_config = { }; etc then just use the address of the right one directly. In this driver, I suspect that is simpler than using the array. > +enum adc128_configuration_index { > + ADC128_CONFIG_INDEX_082S, > + ADC128_CONFIG_INDEX_102S, > + ADC128_CONFIG_INDEX_122S, > + ADC128_CONFIG_INDEX_124S, > + ADC128_CONFIG_INDEX_128S, > }; > > static const struct iio_info adc128_info = { > @@ -177,31 +226,43 @@ static int adc128_probe(struct spi_device *spi) > } > > static const struct of_device_id adc128_of_match[] = { > - { .compatible = "ti,adc128s052", .data = &adc128_config[0] }, > - { .compatible = "ti,adc122s021", .data = &adc128_config[1] }, > - { .compatible = "ti,adc122s051", .data = &adc128_config[1] }, > - { .compatible = "ti,adc122s101", .data = &adc128_config[1] }, > - { .compatible = "ti,adc124s021", .data = &adc128_config[2] }, > - { .compatible = "ti,adc124s051", .data = &adc128_config[2] }, > - { .compatible = "ti,adc124s101", .data = &adc128_config[2] }, > + { .compatible = "ti,adc082s021", .data = &adc128_config[ADC128_CONFIG_INDEX_082S] }, > + { .compatible = "ti,adc082s051", .data = &adc128_config[ADC128_CONFIG_INDEX_082S] }, > + { .compatible = "ti,adc082s101", .data = &adc128_config[ADC128_CONFIG_INDEX_082S] }, > + { .compatible = "ti,adc102s021", .data = &adc128_config[ADC128_CONFIG_INDEX_102S] }, > + { .compatible = "ti,adc102s051", .data = &adc128_config[ADC128_CONFIG_INDEX_102S] }, > + { .compatible = "ti,adc102s101", .data = &adc128_config[ADC128_CONFIG_INDEX_102S] }, > + { .compatible = "ti,adc122s021", .data = &adc128_config[ADC128_CONFIG_INDEX_122S] }, > + { .compatible = "ti,adc122s051", .data = &adc128_config[ADC128_CONFIG_INDEX_122S] }, > + { .compatible = "ti,adc122s101", .data = &adc128_config[ADC128_CONFIG_INDEX_122S] }, > + { .compatible = "ti,adc124s021", .data = &adc128_config[ADC128_CONFIG_INDEX_124S] }, > + { .compatible = "ti,adc124s051", .data = &adc128_config[ADC128_CONFIG_INDEX_124S] }, > + { .compatible = "ti,adc124s101", .data = &adc128_config[ADC128_CONFIG_INDEX_124S] }, > + { .compatible = "ti,adc128s052", .data = &adc128_config[ADC128_CONFIG_INDEX_128S] }, > { /* sentinel */ }, > }; > MODULE_DEVICE_TABLE(of, adc128_of_match); > > static const struct spi_device_id adc128_id[] = { > - { "adc128s052", (kernel_ulong_t)&adc128_config[0] }, > - { "adc122s021", (kernel_ulong_t)&adc128_config[1] }, > - { "adc122s051", (kernel_ulong_t)&adc128_config[1] }, > - { "adc122s101", (kernel_ulong_t)&adc128_config[1] }, > - { "adc124s021", (kernel_ulong_t)&adc128_config[2] }, > - { "adc124s051", (kernel_ulong_t)&adc128_config[2] }, > - { "adc124s101", (kernel_ulong_t)&adc128_config[2] }, > + { "adc082s021", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_082S] }, > + { "adc082s051", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_082S] }, > + { "adc082s101", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_082S] }, > + { "adc102s021", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_102S] }, > + { "adc102s051", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_102S] }, > + { "adc102s101", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_102S] }, > + { "adc122s021", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_122S] }, > + { "adc122s051", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_122S] }, > + { "adc122s101", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_122S] }, > + { "adc124s021", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_124S] }, > + { "adc124s051", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_124S] }, > + { "adc124s101", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_124S] }, > + { "adc128s052", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_128S] }, > { } > }; > MODULE_DEVICE_TABLE(spi, adc128_id); > > static const struct acpi_device_id adc128_acpi_match[] = { > - { "AANT1280", (kernel_ulong_t)&adc128_config[2] }, > + { "AANT1280", (kernel_ulong_t)&adc128_config[ADC128_CONFIG_INDEX_124S] }, > { } > }; > MODULE_DEVICE_TABLE(acpi, adc128_acpi_match);
