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staging:iio: Make read / write attributes for channel values optional.

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Until now all channels have had read/write attributes. This patch
allows for channels where we can't actually read the value (or for
output devices, write it!)

v2 introduces separate elements for processed and raw thus removing
some special case code from the core.  Thanks to Lars-Peter for an
excellent suggestion!

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jonathan Cameron 2012-04-15 17:41:30 +01:00 committed by Greg Kroah-Hartman
parent a8c0ed7565
commit 75a973c754
1 changed files with 4 additions and 16 deletions
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20
drivers/staging/iio/industrialio-core.c
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@ -80,6 +80,8 @@ static const char * const iio_modifier_names[] = {
/* relies on pairs of these shared then separate */
static const char * const iio_chan_info_postfix[] = {
[IIO_CHAN_INFO_RAW] = "raw",
[IIO_CHAN_INFO_PROCESSED] = "input",
[IIO_CHAN_INFO_SCALE] = "scale",
[IIO_CHAN_INFO_OFFSET] = "offset",
[IIO_CHAN_INFO_CALIBSCALE] = "calibscale",
@ -577,26 +579,12 @@ static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan)
{
int ret, attrcount = 0;
int i = 4;
int i;
const struct iio_chan_spec_ext_info *ext_info;
if (chan->channel < 0)
return 0;
ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val],
chan,
&iio_read_channel_info,
(chan->output ?
&iio_write_channel_info : NULL),
0,
0,
&indio_dev->dev,
&indio_dev->channel_attr_list);
if (ret)
goto error_ret;
attrcount++;
for_each_set_bit_from(i, &chan->info_mask, sizeof(long)*8) {
for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
chan,
&iio_read_channel_info,