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charset="utf-8" Add a new functionality to ad7779 driver that streams data through data output interface using IIO backend interface. Signed-off-by: Ioana Risteiu --- drivers/iio/adc/ad7779.c | 107 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 106 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad7779.c b/drivers/iio/adc/ad7779.c index f7e681c0e8c0..abf3fff20dd4 100644 --- a/drivers/iio/adc/ad7779.c +++ b/drivers/iio/adc/ad7779.c @@ -31,6 +31,8 @@ #include #include =20 +#include + #define AD7779_SPI_READ_CMD BIT(7) =20 #define AD7779_DISABLE_SD BIT(7) @@ -157,6 +159,8 @@ struct ad7779_state { u8 reg_rx_buf[3]; u8 reg_tx_buf[3]; u8 reset_buf[8]; + + struct iio_backend *back; }; =20 static const char * const ad7779_filter_type[] =3D { @@ -630,12 +634,38 @@ static int ad7779_reset(struct iio_dev *indio_dev, st= ruct gpio_desc *reset_gpio) return ret; } =20 +static int ad7779_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct ad7779_state *st =3D iio_priv(indio_dev); + unsigned int c; + int ret; + + for (c =3D 0; c < AD7779_NUM_CHANNELS; c++) { + if (test_bit(c, scan_mask)) + ret =3D iio_backend_chan_enable(st->back, c); + else + ret =3D iio_backend_chan_disable(st->back, c); + if (ret) + return ret; + } + + return 0; +} + static const struct iio_info ad7779_info =3D { .read_raw =3D ad7779_read_raw, .write_raw =3D ad7779_write_raw, .debugfs_reg_access =3D &ad7779_reg_access, }; =20 +static const struct iio_info ad7779_info_data =3D { + .read_raw =3D ad7779_read_raw, + .write_raw =3D ad7779_write_raw, + .debugfs_reg_access =3D &ad7779_reg_access, + .update_scan_mode =3D &ad7779_update_scan_mode, +}; + static const struct iio_enum ad7779_filter_enum =3D { .items =3D ad7779_filter_type, .num_items =3D ARRAY_SIZE(ad7779_filter_type), @@ -674,6 +704,7 @@ static const struct iio_chan_spec_ext_info ad7779_ext_f= ilter[] =3D { =20 #define AD777x_CHAN_FILTER_S(index) \ AD777x_CHAN_S(index, ad7779_ext_filter) + static const struct iio_chan_spec ad7779_channels[] =3D { AD777x_CHAN_NO_FILTER_S(0), AD777x_CHAN_NO_FILTER_S(1), @@ -752,6 +783,44 @@ static int ad7779_conf(struct ad7779_state *st, struct= gpio_desc *start_gpio) return 0; } =20 +static int ad7779_set_data_lines(struct iio_dev *indio_dev, + unsigned int num_lanes) +{ + struct ad7779_state *st =3D iio_priv(indio_dev); + int ret; + + ret =3D ad7779_set_sampling_frequency(st, num_lanes * AD7779_DEFAULT_SAMP= LING_1LINE); + if (ret) + return ret; + + ret =3D iio_backend_num_lanes_set(st->back, num_lanes); + if (ret) + return ret; + + return ad7779_spi_write_mask(st, AD7779_REG_DOUT_FORMAT, + AD7779_DOUT_FORMAT_MSK, + FIELD_PREP(AD7779_DOUT_FORMAT_MSK, 2 - ilog2(num_lanes))); +} + +static int ad7779_setup_channels(struct iio_dev *indio_dev, const struct a= d7779_state *st) +{ + struct iio_chan_spec *channels; + struct device *dev =3D &st->spi->dev; + + channels =3D devm_kmemdup_array(dev, st->chip_info->channels, + ARRAY_SIZE(ad7779_channels), + sizeof(*channels), GFP_KERNEL); + if (!channels) + return -ENOMEM; + + for (int i =3D 0; i < ARRAY_SIZE(ad7779_channels); i++) + channels[i].scan_type.endianness =3D IIO_CPU; + + indio_dev->channels =3D channels; + + return 0; +} + static int ad7779_setup_without_backend(struct ad7779_state *st, struct ii= o_dev *indio_dev) { int ret; @@ -796,6 +865,38 @@ static int ad7779_setup_without_backend(struct ad7779_= state *st, struct iio_dev FIELD_PREP(AD7779_DCLK_CLK_DIV_MSK, 7)); } =20 +static int ad7779_setup_backend(struct ad7779_state *st, struct iio_dev *i= ndio_dev) +{ + struct device *dev =3D &st->spi->dev; + int ret =3D -EINVAL; + int num_lanes; + + indio_dev->info =3D &ad7779_info_data; + + ret =3D ad7779_setup_channels(indio_dev, st); + if (ret) + return ret; + + st->back =3D devm_iio_backend_get(dev, NULL); + if (IS_ERR(st->back)) + return dev_err_probe(dev, PTR_ERR(st->back), + "failed to get iio backend"); + + ret =3D devm_iio_backend_request_buffer(dev, st->back, indio_dev); + if (ret) + return ret; + + ret =3D devm_iio_backend_enable(dev, st->back); + if (ret) + return ret; + + ret =3D device_property_read_u32(dev, "adi,num-lanes", &num_lanes); + if (ret) + return ad7779_set_data_lines(indio_dev, 4); + + return ad7779_set_data_lines(indio_dev, num_lanes); +} + static int ad7779_probe(struct spi_device *spi) { struct iio_dev *indio_dev; @@ -848,7 +949,10 @@ static int ad7779_probe(struct spi_device *spi) indio_dev->modes =3D INDIO_DIRECT_MODE; indio_dev->num_channels =3D ARRAY_SIZE(ad7779_channels); =20 - ret =3D ad7779_setup_without_backend(st, indio_dev); + if (device_property_present(dev, "io-backends")) + ret =3D ad7779_setup_backend(st, indio_dev); + else + ret =3D ad7779_setup_without_backend(st, indio_dev); =20 if (ret) return ret; @@ -943,3 +1047,4 @@ module_spi_driver(ad7779_driver); MODULE_AUTHOR("Ramona Alexandra Nechita "); MODULE_DESCRIPTION("Analog Devices AD7779 ADC"); MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("IIO_BACKEND"); --=20 2.47.2