diff options
Diffstat (limited to 'drivers/iio/industrialio-core.c')
| -rw-r--r-- | drivers/iio/industrialio-core.c | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 0f6cda7ffe45..6a6568d4a2cb 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -667,7 +667,6 @@ static ssize_t __iio_format_value(char *buf, size_t offset, unsigned int type, vals[1]); case IIO_VAL_FRACTIONAL: tmp2 = div_s64((s64)vals[0] * 1000000000LL, vals[1]); - tmp1 = vals[1]; tmp0 = (int)div_s64_rem(tmp2, 1000000000, &tmp1); if ((tmp2 < 0) && (tmp0 == 0)) return sysfs_emit_at(buf, offset, "-0.%09u", abs(tmp1)); @@ -1912,7 +1911,7 @@ static void iio_sanity_check_avail_scan_masks(struct iio_dev *indio_dev) int i; av_masks = indio_dev->available_scan_masks; - masklength = indio_dev->masklength; + masklength = iio_get_masklength(indio_dev); longs_per_mask = BITS_TO_LONGS(masklength); /* @@ -1965,6 +1964,49 @@ static void iio_sanity_check_avail_scan_masks(struct iio_dev *indio_dev) } } +/** + * iio_active_scan_mask_index - Get index of the active scan mask inside the + * available scan masks array + * @indio_dev: the IIO device containing the active and available scan masks + * + * Returns: the index or -EINVAL if active_scan_mask is not set + */ +int iio_active_scan_mask_index(struct iio_dev *indio_dev) + +{ + const unsigned long *av_masks; + unsigned int masklength = iio_get_masklength(indio_dev); + int i = 0; + + if (!indio_dev->active_scan_mask) + return -EINVAL; + + /* + * As in iio_scan_mask_match and iio_sanity_check_avail_scan_masks, + * the condition here do not handle multi-long masks correctly. + * It only checks the first long to be zero, and will use such mask + * as a terminator even if there was bits set after the first long. + * + * This should be fine since the available_scan_mask has already been + * sanity tested using iio_sanity_check_avail_scan_masks. + * + * See iio_scan_mask_match and iio_sanity_check_avail_scan_masks for + * more details + */ + av_masks = indio_dev->available_scan_masks; + while (*av_masks) { + if (indio_dev->active_scan_mask == av_masks) + return i; + av_masks += BITS_TO_LONGS(masklength); + i++; + } + + dev_warn(indio_dev->dev.parent, + "active scan mask is not part of the available scan masks\n"); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(iio_active_scan_mask_index); + int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) { struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |