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Signed-off-by: Marcelo Schmitt --- Change log v3 -> v4: - Squashed triggered buffer support into main driver. drivers/iio/adc/Kconfig | 1 + drivers/iio/adc/ltc2378.c | 76 +++++++++++++++++++++++++++------------ 2 files changed, 54 insertions(+), 23 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 8d2fadbf74b1..ac162425dc91 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -950,6 +950,7 @@ 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 5b28630003b1..fcccd2774549 100644 --- a/drivers/iio/adc/ltc2378.c +++ b/drivers/iio/adc/ltc2378.c @@ -6,6 +6,7 @@ * Author: Marcelo Schmitt */ +#include #include #include #include @@ -29,6 +30,8 @@ #include #include #include +#include +#include #include #define LTC2378_TDSDOBUSYL_NS 5 @@ -68,7 +71,7 @@ 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; @@ -108,7 +111,7 @@ struct ltc2378_state { static const struct ltc2378_chip_info ltc2338_18_chip_info = { .name = "ltc2338-18", .internal_ref_uv = 4096000, - .chan = LTC2378_BIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -116,7 +119,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -124,7 +127,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -132,7 +135,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -140,7 +143,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -148,7 +151,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -156,7 +159,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -164,7 +167,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 1600 * HZ_PER_KHZ, .tconv_ns = 412, @@ -172,7 +175,7 @@ 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_UNIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_UNIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_UNIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 2 * HZ_PER_MHZ, .tconv_ns = 322, @@ -180,7 +183,7 @@ 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_BIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -188,7 +191,7 @@ 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_BIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -196,7 +199,7 @@ 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_BIPOLAR_DIFF_CHANNEL(20), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(20), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(20), .max_sample_rate_hz = 250 * HZ_PER_KHZ, .tconv_ns = 3000, @@ -204,7 +207,7 @@ 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_BIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -212,7 +215,7 @@ 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_BIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -220,7 +223,7 @@ 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_BIPOLAR_DIFF_CHANNEL(20), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(20), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(20), .max_sample_rate_hz = 500 * HZ_PER_KHZ, .tconv_ns = 1500, @@ -228,7 +231,7 @@ 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_BIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -236,7 +239,7 @@ 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_BIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 1 * HZ_PER_MHZ, .tconv_ns = 527, @@ -244,7 +247,7 @@ 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_BIPOLAR_DIFF_CHANNEL(20), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(20), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(20), .max_sample_rate_hz = 1 * HZ_PER_MHZ, .tconv_ns = 675, @@ -252,7 +255,7 @@ 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_BIPOLAR_DIFF_CHANNEL(18), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(18), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(18), .max_sample_rate_hz = 1600 * HZ_PER_KHZ, .tconv_ns = 412, @@ -260,7 +263,7 @@ 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_BIPOLAR_DIFF_CHANNEL(16), + .chan = { LTC2378_BIPOLAR_DIFF_CHANNEL(16), IIO_CHAN_SOFT_TIMESTAMP(1) }, .offload_chan = LTC2378_OFFLOAD_BIPOLAR_DIFF_CHANNEL(16), .max_sample_rate_hz = 2 * HZ_PER_MHZ, .tconv_ns = 322, @@ -279,6 +282,25 @@ 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) { @@ -640,8 +662,16 @@ 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 dev_err_probe(dev, ret, + "failed to setup triggered buffer\n"); } else if (ret) { return dev_err_probe(dev, ret, "failed to get offload\n"); } else { -- 2.53.0