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This ensures a fully functional device, but with limited capabilities. Signed-off-by: Tomas Melin --- drivers/iio/adc/ad9467.c | 72 ++++++++++++++++++++++++++++++--------------= ---- 1 file changed, 45 insertions(+), 27 deletions(-) diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c index 59c3fa3bcc9b0b8b36b78c3b54fd7977cae23496..eb57f72211430fc2c41baa9ed1a= 1e0ecf798ad57 100644 --- a/drivers/iio/adc/ad9467.c +++ b/drivers/iio/adc/ad9467.c @@ -912,8 +912,11 @@ static int __ad9467_update_clock(struct ad9467_state *= st, long r_clk) if (ret) return ret; =20 - guard(mutex)(&st->lock); - return ad9467_calibrate(st); + if (iio_backend_has_caps(st->back, IIO_BACKEND_CAP_CALIBRATION)) { + guard(mutex)(&st->lock); + return ad9467_calibrate(st); + } + return 0; } =20 static int ad9467_write_raw(struct iio_dev *indio_dev, @@ -1119,12 +1122,15 @@ static ssize_t ad9467_chan_test_mode_read(struct fi= le *file, len =3D scnprintf(buf, sizeof(buf), "Running \"%s\" Test:\n\t", ad9467_test_modes[chan->mode]); =20 - ret =3D iio_backend_debugfs_print_chan_status(st->back, chan->idx, - buf + len, - sizeof(buf) - len); - if (ret < 0) - return ret; - len +=3D ret; + if (iio_backend_has_caps(st->back, IIO_BACKEND_CAP_CALIBRATION)) { + ret =3D iio_backend_debugfs_print_chan_status(st->back, + chan->idx, + buf + len, + sizeof(buf) - len); + if (ret < 0) + return ret; + len +=3D ret; + } } else if (chan->mode =3D=3D AN877_ADC_TESTMODE_OFF) { len =3D scnprintf(buf, sizeof(buf), "No test Running...\n"); } else { @@ -1188,16 +1194,19 @@ static ssize_t ad9467_chan_test_mode_write(struct f= ile *file, return ret; =20 /* some patterns have a backend matching monitoring block */ - if (mode =3D=3D AN877_ADC_TESTMODE_PN9_SEQ) { - ret =3D ad9467_backend_testmode_on(st, chan->idx, + if (iio_backend_has_caps(st->back, + IIO_BACKEND_CAP_CALIBRATION)) { + if (mode =3D=3D AN877_ADC_TESTMODE_PN9_SEQ) { + ret =3D ad9467_backend_testmode_on(st, chan->idx, IIO_BACKEND_ADI_PRBS_9A); - if (ret) - return ret; - } else if (mode =3D=3D AN877_ADC_TESTMODE_PN23_SEQ) { - ret =3D ad9467_backend_testmode_on(st, chan->idx, + if (ret) + return ret; + } else if (mode =3D=3D AN877_ADC_TESTMODE_PN23_SEQ) { + ret =3D ad9467_backend_testmode_on(st, chan->idx, IIO_BACKEND_ADI_PRBS_23A); - if (ret) - return ret; + if (ret) + return ret; + } } } =20 @@ -1263,8 +1272,10 @@ static void ad9467_debugfs_init(struct iio_dev *indi= o_dev) if (!st->chan_test) return; =20 - debugfs_create_file("calibration_table_dump", 0400, d, st, - &ad9467_calib_table_fops); + if (iio_backend_has_caps(st->back, IIO_BACKEND_CAP_CALIBRATION)) { + debugfs_create_file("calibration_table_dump", 0400, d, st, + &ad9467_calib_table_fops); + } =20 for (chan =3D 0; chan < st->info->num_channels; chan++) { snprintf(attr_name, sizeof(attr_name), "in_voltage%u_test_mode", @@ -1339,17 +1350,24 @@ static int ad9467_probe(struct spi_device *spi) if (ret) return ret; =20 - ret =3D devm_iio_backend_request_buffer(&spi->dev, st->back, indio_dev); - if (ret) - return ret; + if (iio_backend_has_caps(st->back, IIO_BACKEND_CAP_BUFFERING)) { + ret =3D devm_iio_backend_request_buffer(&spi->dev, st->back, + indio_dev); + if (ret) + return ret; + } =20 - ret =3D devm_iio_backend_enable(&spi->dev, st->back); - if (ret) - return ret; + if (!iio_backend_has_caps(st->back, IIO_BACKEND_CAP_ALWAYS_ON)) { + ret =3D devm_iio_backend_enable(&spi->dev, st->back); + if (ret) + return ret; + } =20 - ret =3D ad9467_calibrate(st); - if (ret) - return ret; + if (iio_backend_has_caps(st->back, IIO_BACKEND_CAP_CALIBRATION)) { + ret =3D ad9467_calibrate(st); + if (ret) + return ret; + } =20 ret =3D devm_iio_device_register(&spi->dev, indio_dev); if (ret) --=20 2.47.3