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authorMark Brown <broonie@kernel.org>2015-08-28 20:04:53 +0100
committerMark Brown <broonie@kernel.org>2015-08-31 11:15:07 +0100
commitd5b98eb12420ce856caaf57dc5256eedc56a3747 (patch)
tree563e312e36672c13caed1bad13bf1906ff3442cc /drivers/base/regmap/regmap.c
parent9c9f7f675970ba1b888272f016157de21f69e7e2 (diff)
downloadlinux-linaro-stable-d5b98eb12420ce856caaf57dc5256eedc56a3747.tar.gz
regmap: Support bulk reads for devices without raw formatting
When doing a bulk read from a device which lacks raw I/O support we fall back to doing register at a time reads but we still use the raw formatters in order to render the data into the word size used by the device (since bulk reads still operate on the device word size rather than unsigned ints). This means that devices without raw formatting such as those that provide reg_read() are not supported. Provide handling for them by copying the values read into native endian values of the appropriate size. Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base/regmap/regmap.c')
-rw-r--r--drivers/base/regmap/regmap.c29
1 files changed, 28 insertions, 1 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 27456c7978b9..b77f1c6abdad 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -2338,7 +2338,34 @@ int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
&ival);
if (ret != 0)
return ret;
- map->format.format_val(val + (i * val_bytes), ival, 0);
+
+ if (map->format.format_val) {
+ map->format.format_val(val + (i * val_bytes), ival, 0);
+ } else {
+ /* Devices providing read and write
+ * operations can use the bulk I/O
+ * functions if they define a val_bytes,
+ * we assume that the values are native
+ * endian.
+ */
+ u32 *u32 = val;
+ u16 *u16 = val;
+ u8 *u8 = val;
+
+ switch (map->format.val_bytes) {
+ case 4:
+ u32[i] = ival;
+ break;
+ case 2:
+ u16[i] = ival;
+ break;
+ case 1:
+ u8[i] = ival;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
}
}