kernel.git/drivers/iio/inkern.c, branch linux-6.4.y

iio: inkern: fix coding style warnings

2022-08-15T21:30:00Z

Just cosmetics. No functional change intended... Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220715122903.332535-16-nuno.sa@analog.com Signed-off-by: Jonathan Cameron

iio: inkern: remove OF dependencies

2022-08-15T21:30:00Z

Since all users of the OF dependendent API are now converted to use the firmware agnostic alternative, we can drop OF dependencies from the IIO in kernel interface. Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220715122903.332535-15-nuno.sa@analog.com Signed-off-by: Jonathan Cameron

iio: inkern: move to fwnode properties

2022-08-15T21:29:59Z

This moves the IIO in kernel interface to use fwnode properties and thus be firmware agnostic. Note that the interface is still not firmware agnostic. At this point we have both OF and fwnode interfaces so that we don't break any user. On top of this we also want to have a per driver conversion and that is the main reason we have both of_xlate() and fwnode_xlate() support. Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220715122903.332535-6-nuno.sa@analog.com Signed-off-by: Jonathan Cameron

iio: inkern: split of_iio_channel_get_by_name()

2022-08-15T21:29:59Z

This change splits of_iio_channel_get_by_name() so that it decouples looking for channels in the current node from looking in it's parents nodes. This will be helpful when moving to fwnode properties where we need to release the handles when looking for channels in parent's nodes. No functional change intended... Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220715122903.332535-5-nuno.sa@analog.com Signed-off-by: Jonathan Cameron

iio: inkern: only return error codes in iio_channel_get_*() APIs

2022-08-15T21:29:59Z

APIs like of_iio_channel_get_by_name() and of_iio_channel_get_all() were returning a mix of NULL and pointers with NULL being the way to "notify" that we should do a "system" lookup for channels. This make it very confusing and prone to errors as commit 9f63cc0921ec ("iio: inkern: fix return value in devm_of_iio_channel_get_by_name()") proves. On top of this, patterns like 'if (channel != NULL) return channel' were being used where channel could actually be an error code which makes the code hard to read. This change also makes some functional changes on how errors were being handled. In the original behavior, even if we get an error like '-ENOMEM', we still continue with the search. We should only continue to lookup for the channel when it makes sense to do so. Hence, the main error handling in 'of_iio_channel_get_by_name()' is changed to the following logic: * If a channel 'name' is provided and we do find it via 'io-channel-names', we should be able to get it. If we get any error, we should not proceed with the lookup. Moreover, we should return an error so that callers won't proceed with a system lookup. * If a channel 'name' is provided and we cannot find it ('index < 0'), 'of_parse_phandle_with_args()' is expected to fail with '-EINVAL'. Hence, we should only continue if we get that error. * If a channel 'name' is not provided we should only carry on with the search if 'of_parse_phandle_with_args()' returns '-ENOENT'. Also note that a system channel lookup is only done if the returned error code (from 'of_iio_channel_get_by_name()' or 'of_iio_channel_get_all()' is -ENODEV. Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220715122903.332535-4-nuno.sa@analog.com Signed-off-by: Jonathan Cameron

iio: inkern: fix return value in devm_of_iio_channel_get_by_name()

2022-08-15T21:29:59Z

of_iio_channel_get_by_name() can either return NULL or an error pointer so that only doing IS_ERR() is not enough. Fix it by checking the NULL pointer case and return -ENODEV in that case. Note this is done like this so that users of the function (which only check for error pointers) do not need to be changed. This is not ideal since we are losing error codes and as such, in a follow up change, things will be unified so that of_iio_channel_get_by_name() only returns error codes. Fixes: 6e39b145cef7 ("iio: provide of_iio_channel_get_by_name() and devm_ version it") Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220715122903.332535-3-nuno.sa@analog.com Signed-off-by: Jonathan Cameron

iio: inkern: only release the device node when done with it

2022-08-15T21:29:59Z

'of_node_put()' can potentially release the memory pointed to by 'iiospec.np' which would leave us with an invalid pointer (and we would still pass it in 'of_xlate()'). Note that it is not guaranteed for the of_node lifespan to be attached to the device (to which is attached) lifespan so that there is (even though very unlikely) the possibility for the node to be freed while the device is still around. Thus, as there are indeed some of_xlate users which do access the node, a race is indeed possible. As such, we can only release the node after we are done with it. Fixes: 17d82b47a215d ("iio: Add OF support") Signed-off-by: Nuno Sá Link: https://lore.kernel.org/r/20220715122903.332535-2-nuno.sa@analog.com Signed-off-by: Jonathan Cameron

iio: inkern: make a best effort on offset calculation

2022-01-30T14:38:03Z

iio_convert_raw_to_processed_unlocked() assumes the offset is an integer. Make a best effort to get a valid offset value for fractional cases without breaking implicit truncations. Fixes: 48e44ce0f881 ("iio:inkern: Add function to read the processed value") Signed-off-by: Liam Beguin Reviewed-by: Peter Rosin Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220108205319.2046348-4-liambeguin@gmail.com Cc: Signed-off-by: Jonathan Cameron

iio: inkern: apply consumer scale when no channel scale is available

2022-01-30T14:38:03Z

When a consumer calls iio_read_channel_processed() and no channel scale is available, it's assumed that the scale is one and the raw value is returned as expected. On the other hand, if the consumer calls iio_convert_raw_to_processed() the scaling factor requested by the consumer is not applied. This for example causes the consumer to process mV when expecting uV. Make sure to always apply the scaling factor requested by the consumer. Fixes: adc8ec5ff183 ("iio: inkern: pass through raw values if no scaling") Signed-off-by: Liam Beguin Reviewed-by: Peter Rosin Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220108205319.2046348-3-liambeguin@gmail.com Cc: Signed-off-by: Jonathan Cameron

iio: inkern: apply consumer scale on IIO_VAL_INT cases

2022-01-30T14:37:47Z

When a consumer calls iio_read_channel_processed() and the channel has an integer scale, the scale channel scale is applied and the processed value is returned as expected. On the other hand, if the consumer calls iio_convert_raw_to_processed() the scaling factor requested by the consumer is not applied. This for example causes the consumer to process mV when expecting uV. Make sure to always apply the scaling factor requested by the consumer. Fixes: 48e44ce0f881 ("iio:inkern: Add function to read the processed value") Signed-off-by: Liam Beguin Reviewed-by: Peter Rosin Reviewed-by: Andy Shevchenko Link: https://lore.kernel.org/r/20220108205319.2046348-2-liambeguin@gmail.com Cc: Signed-off-by: Jonathan Cameron