linux-kernel - Applied "regmap: Support bulk reads for devices without raw formatting" to the regmap tree

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Date:	Mon, 31 Aug 2015 11:19:34 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Applied "regmap: Support bulk reads for devices without raw formatting" to the regmap tree

The patch

   regmap: Support bulk reads for devices without raw formatting

has been applied to the regmap tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From d5b98eb12420ce856caaf57dc5256eedc56a3747 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@...nel.org>
Date: Fri, 28 Aug 2015 20:04:53 +0100
Subject: [PATCH] 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@...nel.org>
---
 drivers/base/regmap/regmap.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 27456c7..b77f1c6 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;
+				}
+			}
 		}
 	}

-- 
2.5.0

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