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Reviewed-by: Andy Shevchenko Reviewed-by: David Lechner Signed-off-by: Marcelo Schmitt --- No changes in v8. drivers/iio/adc/Kconfig | 1 + drivers/iio/adc/ltc2378.c | 75 +++++++++++++++++++++++++++------------ 2 files changed, 53 insertions(+), 23 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 96df8453b826..6cf67f7a6eed 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -952,6 +952,7 @@ config LTC2378 select IIO_BUFFER select IIO_BUFFER_DMA select IIO_BUFFER_DMAENGINE + select IIO_TRIGGERED_BUFFER select SPI_OFFLOAD select SPI_OFFLOAD_TRIGGER_PWM help diff --git a/drivers/iio/adc/ltc2378.c b/drivers/iio/adc/ltc2378.c index 7baee02450d3..5128c2a23f75 100644 --- a/drivers/iio/adc/ltc2378.c +++ b/drivers/iio/adc/ltc2378.c @@ -6,6 +6,7 @@ * Author: Marcelo Schmitt */ +#include #include #include #include @@ -32,6 +33,8 @@ #include #include #include +#include +#include #include #define LTC2378_TDSDOBUSYL_NS 5 @@ -105,7 +108,7 @@ struct ltc2378_chip_info { const char *name; unsigned int internal_ref_uV; - struct iio_chan_spec chan; + struct iio_chan_spec chan[2]; /* 1 physical chan + 1 timestamp chan */ struct iio_chan_spec offload_chan; unsigned int max_sample_rate_Hz; unsigned int tconv_ns; @@ -146,7 +149,7 @@ struct ltc2378_state { static const struct ltc2378_chip_info ltc2338_18_chip_info = { .name = "ltc2338-18", .internal_ref_uV = 2048000, - .chan = LTC2378_DIFF_CHANNEL(18), + .chan = { LTC2378_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(18), .max_sample_rate_Hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -154,7 +157,7 @@ static const struct ltc2378_chip_info ltc2338_18_chip_info = { static const struct ltc2378_chip_info ltc2364_16_chip_info = { .name = "ltc2364-16", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(16), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(16), .max_sample_rate_Hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -162,7 +165,7 @@ static const struct ltc2378_chip_info ltc2364_16_chip_info = { static const struct ltc2378_chip_info ltc2364_18_chip_info = { .name = "ltc2364-18", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(18), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(18), .max_sample_rate_Hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -170,7 +173,7 @@ static const struct ltc2378_chip_info ltc2364_18_chip_info = { static const struct ltc2378_chip_info ltc2367_16_chip_info = { .name = "ltc2367-16", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(16), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(16), .max_sample_rate_Hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -178,7 +181,7 @@ static const struct ltc2378_chip_info ltc2367_16_chip_info = { static const struct ltc2378_chip_info ltc2367_18_chip_info = { .name = "ltc2367-18", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(18), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(18), .max_sample_rate_Hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -186,7 +189,7 @@ static const struct ltc2378_chip_info ltc2367_18_chip_info = { static const struct ltc2378_chip_info ltc2368_16_chip_info = { .name = "ltc2368-16", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(16), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(16), .max_sample_rate_Hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -194,7 +197,7 @@ static const struct ltc2378_chip_info ltc2368_16_chip_info = { static const struct ltc2378_chip_info ltc2368_18_chip_info = { .name = "ltc2368-18", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(18), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(18), .max_sample_rate_Hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -202,7 +205,7 @@ static const struct ltc2378_chip_info ltc2368_18_chip_info = { static const struct ltc2378_chip_info ltc2369_18_chip_info = { .name = "ltc2369-18", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(18), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(18), .max_sample_rate_Hz = 1600 * HZ_PER_KHZ, .tconv_ns = 412, @@ -210,7 +213,7 @@ static const struct ltc2378_chip_info ltc2369_18_chip_info = { static const struct ltc2378_chip_info ltc2370_16_chip_info = { .name = "ltc2370-16", - .chan = LTC2378_PSEUDO_DIFF_CHANNEL(16), + .chan = { LTC2378_PSEUDO_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_PSEUDO_DIFF_CHANNEL(16), .max_sample_rate_Hz = 2 * HZ_PER_MHZ, .tconv_ns = 322, @@ -218,7 +221,7 @@ static const struct ltc2378_chip_info ltc2370_16_chip_info = { static const struct ltc2378_chip_info ltc2376_16_chip_info = { .name = "ltc2376-16", - .chan = LTC2378_DIFF_CHANNEL(16), + .chan = { LTC2378_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(16), .max_sample_rate_Hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -226,7 +229,7 @@ static const struct ltc2378_chip_info ltc2376_16_chip_info = { static const struct ltc2378_chip_info ltc2376_18_chip_info = { .name = "ltc2376-18", - .chan = LTC2378_DIFF_CHANNEL(18), + .chan = { LTC2378_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(18), .max_sample_rate_Hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -234,7 +237,7 @@ static const struct ltc2378_chip_info ltc2376_18_chip_info = { static const struct ltc2378_chip_info ltc2376_20_chip_info = { .name = "ltc2376-20", - .chan = LTC2378_DIFF_CHANNEL(20), + .chan = { LTC2378_DIFF_CHANNEL(20), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(20), .max_sample_rate_Hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -242,7 +245,7 @@ static const struct ltc2378_chip_info ltc2376_20_chip_info = { static const struct ltc2378_chip_info ltc2377_16_chip_info = { .name = "ltc2377-16", - .chan = LTC2378_DIFF_CHANNEL(16), + .chan = { LTC2378_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(16), .max_sample_rate_Hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -250,7 +253,7 @@ static const struct ltc2378_chip_info ltc2377_16_chip_info = { static const struct ltc2378_chip_info ltc2377_18_chip_info = { .name = "ltc2377-18", - .chan = LTC2378_DIFF_CHANNEL(18), + .chan = { LTC2378_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(18), .max_sample_rate_Hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -258,7 +261,7 @@ static const struct ltc2378_chip_info ltc2377_18_chip_info = { static const struct ltc2378_chip_info ltc2377_20_chip_info = { .name = "ltc2377-20", - .chan = LTC2378_DIFF_CHANNEL(20), + .chan = { LTC2378_DIFF_CHANNEL(20), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(20), .max_sample_rate_Hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -266,7 +269,7 @@ static const struct ltc2378_chip_info ltc2377_20_chip_info = { static const struct ltc2378_chip_info ltc2378_16_chip_info = { .name = "ltc2378-16", - .chan = LTC2378_DIFF_CHANNEL(16), + .chan = { LTC2378_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(16), .max_sample_rate_Hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -274,7 +277,7 @@ static const struct ltc2378_chip_info ltc2378_16_chip_info = { static const struct ltc2378_chip_info ltc2378_18_chip_info = { .name = "ltc2378-18", - .chan = LTC2378_DIFF_CHANNEL(18), + .chan = { LTC2378_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(18), .max_sample_rate_Hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -282,7 +285,7 @@ static const struct ltc2378_chip_info ltc2378_18_chip_info = { static const struct ltc2378_chip_info ltc2378_20_chip_info = { .name = "ltc2378-20", - .chan = LTC2378_DIFF_CHANNEL(20), + .chan = { LTC2378_DIFF_CHANNEL(20), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(20), .max_sample_rate_Hz = 1 * HZ_PER_MHZ, .tconv_ns = 675, @@ -290,7 +293,7 @@ static const struct ltc2378_chip_info ltc2378_20_chip_info = { static const struct ltc2378_chip_info ltc2379_18_chip_info = { .name = "ltc2379-18", - .chan = LTC2378_DIFF_CHANNEL(18), + .chan = { LTC2378_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(18), .max_sample_rate_Hz = 1600 * HZ_PER_KHZ, .tconv_ns = 412, @@ -298,7 +301,7 @@ static const struct ltc2378_chip_info ltc2379_18_chip_info = { static const struct ltc2378_chip_info ltc2380_16_chip_info = { .name = "ltc2380-16", - .chan = LTC2378_DIFF_CHANNEL(16), + .chan = { LTC2378_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_DIFF_CHANNEL(16), .max_sample_rate_Hz = 2 * HZ_PER_MHZ, .tconv_ns = 322, @@ -317,6 +320,25 @@ static int ltc2378_convert_and_acquire(struct ltc2378_state *st) return ret; } +static irqreturn_t ltc2378_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct ltc2378_state *st = iio_priv(indio_dev); + int ret; + + ret = ltc2378_convert_and_acquire(st); + if (ret < 0) + goto err_out; + + iio_push_to_buffers_with_ts(indio_dev, &st->scan, sizeof(st->scan), + pf->timestamp); + +err_out: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + static int ltc2378_channel_single_read(const struct iio_chan_spec *chan, struct ltc2378_state *st, int *val) { @@ -706,8 +728,15 @@ static int ltc2378_probe(struct spi_device *spi) /* Fall back to low speed usage when no SPI offload is available. */ if (ret == -ENODEV) { indio_dev->info = <c2378_iio_info; - indio_dev->channels = &st->info->chan; - indio_dev->num_channels = 1; + indio_dev->channels = st->info->chan; + indio_dev->num_channels = ARRAY_SIZE(st->info->chan); + + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + iio_pollfunc_store_time, + ltc2378_trigger_handler, + NULL); + if (ret) + return ret; } else if (ret) { return dev_err_probe(dev, ret, "failed to get offload\n"); } else { -- 2.53.0