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iio: adc: ti-lmp92064: add buffering support
Enable buffered reading of samples from the LMP92064 ADC.
The main benefit of this change is being able to read out current and
voltage measurements in a single transfer, allowing instantaneous power
measurements.
Reads into the buffer can be triggered by any software triggers, e.g.
the iio-trig-hrtimer:
$ mkdir /sys/kernel/config/iio/triggers/hrtimer/my-trigger
$ cat /sys/bus/iio/devices/iio\:device3/name
lmp92064
$ iio_readdev -t my-trigger -b 16 iio:device3 | hexdump
WARNING: High-speed mode not enabled
0000000
0000 0176 0101 0001 5507 abd5 7645 1768
0000010 0000 016d 0101 0001 ee1e ac6b 7645 1768
...
Signed-off-by: Leonard Göhrs <l.goehrs@pengutronix.de>
Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20230707063635.1496437-1-l.goehrs@pengutronix.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
parent
1f2a4d506f
commit
6c7bc1d27b
1 changed files with 53 additions and 0 deletions
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@ -16,7 +16,10 @@
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#include <linux/spi/spi.h>
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#include <linux/spi/spi.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/driver.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#define TI_LMP92064_REG_CONFIG_A 0x0000
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#define TI_LMP92064_REG_CONFIG_A 0x0000
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#define TI_LMP92064_REG_CONFIG_B 0x0001
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#define TI_LMP92064_REG_CONFIG_B 0x0001
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@ -91,6 +94,12 @@ static const struct iio_chan_spec lmp92064_adc_channels[] = {
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.address = TI_LMP92064_CHAN_INC,
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.address = TI_LMP92064_CHAN_INC,
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.info_mask_separate =
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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.scan_index = TI_LMP92064_CHAN_INC,
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.scan_type = {
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.sign = 'u',
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.realbits = 12,
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.storagebits = 16,
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},
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.datasheet_name = "INC",
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.datasheet_name = "INC",
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},
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},
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{
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{
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@ -98,8 +107,20 @@ static const struct iio_chan_spec lmp92064_adc_channels[] = {
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.address = TI_LMP92064_CHAN_INV,
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.address = TI_LMP92064_CHAN_INV,
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.info_mask_separate =
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.info_mask_separate =
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
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.scan_index = TI_LMP92064_CHAN_INV,
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.scan_type = {
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.sign = 'u',
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.realbits = 12,
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.storagebits = 16,
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},
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.datasheet_name = "INV",
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.datasheet_name = "INV",
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},
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},
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IIO_CHAN_SOFT_TIMESTAMP(2),
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};
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static const unsigned long lmp92064_scan_masks[] = {
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BIT(TI_LMP92064_CHAN_INC) | BIT(TI_LMP92064_CHAN_INV),
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0
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};
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};
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static int lmp92064_read_meas(struct lmp92064_adc_priv *priv, u16 *res)
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static int lmp92064_read_meas(struct lmp92064_adc_priv *priv, u16 *res)
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@ -171,6 +192,32 @@ static int lmp92064_read_raw(struct iio_dev *indio_dev,
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}
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}
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}
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}
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static irqreturn_t lmp92064_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct lmp92064_adc_priv *priv = iio_priv(indio_dev);
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struct {
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u16 values[2];
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int64_t timestamp __aligned(8);
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} data;
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int ret;
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memset(&data, 0, sizeof(data));
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ret = lmp92064_read_meas(priv, data.values);
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if (ret)
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goto err;
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iio_push_to_buffers_with_timestamp(indio_dev, &data,
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iio_get_time_ns(indio_dev));
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err:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static int lmp92064_reset(struct lmp92064_adc_priv *priv,
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static int lmp92064_reset(struct lmp92064_adc_priv *priv,
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struct gpio_desc *gpio_reset)
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struct gpio_desc *gpio_reset)
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{
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{
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@ -301,6 +348,12 @@ static int lmp92064_adc_probe(struct spi_device *spi)
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indio_dev->channels = lmp92064_adc_channels;
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indio_dev->channels = lmp92064_adc_channels;
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indio_dev->num_channels = ARRAY_SIZE(lmp92064_adc_channels);
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indio_dev->num_channels = ARRAY_SIZE(lmp92064_adc_channels);
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indio_dev->info = &lmp92064_adc_info;
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indio_dev->info = &lmp92064_adc_info;
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indio_dev->available_scan_masks = lmp92064_scan_masks;
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ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
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lmp92064_trigger_handler, NULL);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to setup buffered read\n");
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return devm_iio_device_register(dev, indio_dev);
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return devm_iio_device_register(dev, indio_dev);
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}
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}
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