staging:iio: add a raw and processed elements to info_mask

This will allow us to have drivers where the channel value
may not be read or written but other information is available.
Also adds the ability to have both processed and raw access
to a given channel, though in most cases this doesn't make
sense.

Ultimately will lead to simpler code by allowing us to drop
the special case handling for the value reading cases.

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>

diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h
index b07ddd36ca42df39c20bc650531b1cff1c50508e..dda16028df131628765393198e08a2593cbf5280 100644 (file)
--- a/drivers/staging/iio/iio.h
+++ b/drivers/staging/iio/iio.h
@@ -26,8 +26,9 @@ enum iio_data_type {
 
 /* Could add the raw attributes as well - allowing buffer only devices */
 enum iio_chan_info_enum {
-       /* 0 is reserved for raw attributes */
-       IIO_CHAN_INFO_SCALE = 1,
+       IIO_CHAN_INFO_RAW = 0,
+       IIO_CHAN_INFO_PROCESSED,
+       IIO_CHAN_INFO_SCALE,
        IIO_CHAN_INFO_OFFSET,
        IIO_CHAN_INFO_CALIBSCALE,
        IIO_CHAN_INFO_CALIBBIAS,
@@ -42,6 +43,10 @@ enum iio_chan_info_enum {
 #define IIO_CHAN_INFO_SHARED_BIT(type) BIT(type*2)
 #define IIO_CHAN_INFO_SEPARATE_BIT(type) BIT(type*2 + 1)
 
+#define IIO_CHAN_INFO_RAW_SEPARATE_BIT                 \
+       IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_RAW)
+#define IIO_CHAN_INFO_PROCESSED_SEPARATE_BIT                   \
+       IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_PROCESSED)
 #define IIO_CHAN_INFO_SCALE_SEPARATE_BIT               \
        IIO_CHAN_INFO_SEPARATE_BIT(IIO_CHAN_INFO_SCALE)
 #define IIO_CHAN_INFO_SCALE_SHARED_BIT                 \

diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c
index 9e42713e5f554f1699615e6c9b2fa543650df0f6..817e3fa7a9db0d94383af6b3010ed2e731a3ac86 100644 (file)
--- a/drivers/staging/iio/industrialio-core.c
+++ b/drivers/staging/iio/industrialio-core.c
@@ -576,7 +576,8 @@ error_ret:
 static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
                                        struct iio_chan_spec const *chan)
 {
-       int ret, i, attrcount = 0;
+       int ret, attrcount = 0;
+       int i = 4;
        const struct iio_chan_spec_ext_info *ext_info;
 
        if (chan->channel < 0)
@@ -595,7 +596,7 @@ static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
                goto error_ret;
        attrcount++;
 
-       for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) {
+       for_each_set_bit_from(i, &chan->info_mask, sizeof(long)*8) {
                ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2],
                                             chan,
                                             &iio_read_channel_info,