linux-kernel - [PATCH] regmap: add support for 7/17 register formating

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Date:   Wed, 26 May 2021 11:52:24 +0300
From:   Antoniu Miclaus <antoniu.miclaus@...log.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <broonie@...nel.org>, <gregkh@...uxfoundation.org>,
        <rafael@...nel.org>, Antoniu Miclaus <antoniu.miclaus@...log.com>,
        Andrei Drimbarean <andrei.drimbarean@...log.com>
Subject: [PATCH] regmap: add support for 7/17 register formating

This patch adds support for 7 bits register, 17 bits value type register
formating. This is used, for example, by the Analog Devices
ADMV1013/ADMV1014.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
Signed-off-by: Andrei Drimbarean <andrei.drimbarean@...log.com>
---
 drivers/base/regmap/regmap.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 19f57ccfbe1d..bc1c36b93c15 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -230,6 +230,16 @@ static void regmap_format_7_9_write(struct regmap *map,
 	*out = cpu_to_be16((reg << 9) | val);
 }
 
+static void regmap_format_7_17_write(struct regmap *map,
+				    unsigned int reg, unsigned int val)
+{
+	u8 *out = map->work_buf;
+
+	out[2] = val;
+	out[1] = val >> 8;
+	out[0] = (val >> 16) | (reg << 1);
+}
+
 static void regmap_format_10_14_write(struct regmap *map,
 				    unsigned int reg, unsigned int val)
 {
@@ -864,6 +874,9 @@ struct regmap *__regmap_init(struct device *dev,
 		case 9:
 			map->format.format_write = regmap_format_7_9_write;
 			break;
+		case 17:
+			map->format.format_write = regmap_format_7_17_write;
+			break;
 		default:
 			goto err_hwlock;
 		}
-- 
2.25.1