iio: core: Add support for writing 64 bit attrs

Prior to this patch it was only possible to read 64 bit integers.

Signed-off-by: Sam Winchenbach <swinchenbach@arka.org>
Link: https://patch.msgid.link/20250328174831.227202-6-sam.winchenbach@framepointer.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index b9f4113ae5fc3ee1ef76be6808cc437286690dae..c9955a1c10903e505a39606a1a561628fea6cd4f 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -26,6 +26,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/wait.h>
+#include <linux/wordpart.h>
 
 #include <linux/iio/buffer.h>
 #include <linux/iio/buffer_impl.h>
@@ -966,8 +967,10 @@ static ssize_t iio_write_channel_info(struct device *dev,
        struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
        int ret, fract_mult = 100000;
        int integer, fract = 0;
+       long long integer64;
        bool is_char = false;
        bool scale_db = false;
+       bool is_64bit = false;
 
        /* Assumes decimal - precision based on number of digits */
        if (!indio_dev->info->write_raw)
@@ -991,6 +994,9 @@ static ssize_t iio_write_channel_info(struct device *dev,
                case IIO_VAL_CHAR:
                        is_char = true;
                        break;
+               case IIO_VAL_INT_64:
+                       is_64bit = true;
+                       break;
                default:
                        return -EINVAL;
                }
@@ -1001,6 +1007,13 @@ static ssize_t iio_write_channel_info(struct device *dev,
                if (sscanf(buf, "%c", &ch) != 1)
                        return -EINVAL;
                integer = ch;
+       } else if (is_64bit) {
+               ret = kstrtoll(buf, 0, &integer64);
+               if (ret)
+                       return ret;
+
+               fract = upper_32_bits(integer64);
+               integer = lower_32_bits(integer64);
        } else {
                ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
                                            scale_db);