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author | Cristian Pop <cristian.pop@analog.com> | 2020-09-28 11:09:57 +0200 |
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committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2020-11-08 17:07:39 +0100 |
commit | 75ed0be7200def4015654d896bc3c8e3b22ccefa (patch) | |
tree | d7a229bee916aaec70bf579767674049ed09a8cd /drivers/iio/adc | |
parent | iio:Documentation: Add documentation for label channel attribute (diff) | |
download | linux-75ed0be7200def4015654d896bc3c8e3b22ccefa.tar.xz linux-75ed0be7200def4015654d896bc3c8e3b22ccefa.zip |
iio: adc: ad7768-1: Add channel labels.
For better identification of the channels.
Signed-off-by: Cristian Pop <cristian.pop@analog.com>
Link: https://lore.kernel.org/r/20200928090959.88842-3-cristian.pop@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio/adc')
-rw-r--r-- | drivers/iio/adc/ad7768-1.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index 0e93b0766eb4..5c0cbee03230 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -161,6 +161,7 @@ struct ad7768_state { struct completion completion; struct iio_trigger *trig; struct gpio_desc *gpio_sync_in; + const char *labels[ARRAY_SIZE(ad7768_channels)]; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. @@ -407,6 +408,14 @@ static int ad7768_write_raw(struct iio_dev *indio_dev, } } +static int ad7768_read_label(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, char *label) +{ + struct ad7768_state *st = iio_priv(indio_dev); + + return sprintf(label, "%s\n", st->labels[chan->channel]); +} + static struct attribute *ad7768_attributes[] = { &iio_dev_attr_sampling_frequency_available.dev_attr.attr, NULL @@ -420,6 +429,7 @@ static const struct iio_info ad7768_info = { .attrs = &ad7768_group, .read_raw = &ad7768_read_raw, .write_raw = &ad7768_write_raw, + .read_label = ad7768_read_label, .debugfs_reg_access = &ad7768_reg_access, }; @@ -532,6 +542,33 @@ static void ad7768_clk_disable(void *data) clk_disable_unprepare(st->mclk); } +static int ad7768_set_channel_label(struct iio_dev *indio_dev, + int num_channels) +{ + struct ad7768_state *st = iio_priv(indio_dev); + struct device *device = indio_dev->dev.parent; + struct fwnode_handle *fwnode; + struct fwnode_handle *child; + const char *label; + int crt_ch = 0; + + fwnode = dev_fwnode(device); + fwnode_for_each_child_node(fwnode, child) { + if (fwnode_property_read_u32(child, "reg", &crt_ch)) + continue; + + if (crt_ch >= num_channels) + continue; + + if (fwnode_property_read_string(child, "label", &label)) + continue; + + st->labels[crt_ch] = label; + } + + return 0; +} + static int ad7768_probe(struct spi_device *spi) { struct ad7768_state *st; @@ -604,6 +641,10 @@ static int ad7768_probe(struct spi_device *spi) init_completion(&st->completion); + ret = ad7768_set_channel_label(indio_dev, ARRAY_SIZE(ad7768_channels)); + if (ret) + return ret; + ret = devm_request_irq(&spi->dev, spi->irq, &ad7768_interrupt, IRQF_TRIGGER_RISING | IRQF_ONESHOT, |