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Message-Id: <20250423-mcp3911-fixes-v1-1-5bd0b68ec481@gmail.com>
Date: Wed, 23 Apr 2025 16:46:49 +0200
From: Marcus Folkesson <marcus.folkesson@...il.com>
To: Kent Gustavsson <kent@...oris.se>, Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
Kent Gustavsson <nedo80@...il.com>, devicetree@...r.kernel.org,
Marcus Folkesson <marcus.folkesson@...il.com>,
Lukas Rauber <lukas.rauber@...itza.de>
Subject: [PATCH 1/3] iio: adc: mcp3911: fix device dependent mappings for
conversion result registers
The conversion result registers differs between devices. Make sure the
mapping is correct by using a device dependent .get_raw() callback function.
Fixes: 732ad34260d3 ("iio: adc: mcp3911: add support for the whole MCP39xx family")
Co-developed-by: Lukas Rauber <lukas.rauber@...itza.de>
Signed-off-by: Lukas Rauber <lukas.rauber@...itza.de>
Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
drivers/iio/adc/mcp3911.c | 37 +++++++++++++++++++++++++++++++++----
1 file changed, 33 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/adc/mcp3911.c b/drivers/iio/adc/mcp3911.c
index 6748b44d568db68120172a950bbfffb6adc7cfa3..b72ed4928da88664a00dc143ebf218cb4a7be421 100644
--- a/drivers/iio/adc/mcp3911.c
+++ b/drivers/iio/adc/mcp3911.c
@@ -79,6 +79,8 @@
#define MCP3910_CONFIG1_CLKEXT BIT(6)
#define MCP3910_CONFIG1_VREFEXT BIT(7)
+#define MCP3910_CHANNEL(ch) (MCP3911_REG_CHANNEL0 + (ch))
+
#define MCP3910_REG_OFFCAL_CH0 0x0f
#define MCP3910_OFFCAL(ch) (MCP3910_REG_OFFCAL_CH0 + (ch) * 6)
@@ -110,6 +112,7 @@ struct mcp3911_chip_info {
int (*get_offset)(struct mcp3911 *adc, int channel, int *val);
int (*set_offset)(struct mcp3911 *adc, int channel, int val);
int (*set_scale)(struct mcp3911 *adc, int channel, u32 val);
+ int (*get_raw)(struct mcp3911 *adc, int channel, int *val);
};
struct mcp3911 {
@@ -170,6 +173,18 @@ static int mcp3911_update(struct mcp3911 *adc, u8 reg, u32 mask, u32 val, u8 len
return mcp3911_write(adc, reg, val, len);
}
+static int mcp3911_read_s24(struct mcp3911 *const adc, u8 const reg, s32 *const val)
+{
+ u32 uval;
+ int const ret = mcp3911_read(adc, reg, &uval, 3);
+
+ if (ret)
+ return ret;
+
+ *val = sign_extend32(uval, 23);
+ return ret;
+}
+
static int mcp3910_enable_offset(struct mcp3911 *adc, bool enable)
{
unsigned int mask = MCP3910_CONFIG0_EN_OFFCAL;
@@ -194,6 +209,11 @@ static int mcp3910_set_offset(struct mcp3911 *adc, int channel, int val)
return adc->chip->enable_offset(adc, 1);
}
+static int mcp3910_get_raw(struct mcp3911 *adc, int channel, s32 *val)
+{
+ return mcp3911_read_s24(adc, MCP3910_CHANNEL(channel), val);
+}
+
static int mcp3911_enable_offset(struct mcp3911 *adc, bool enable)
{
unsigned int mask = MCP3911_STATUSCOM_EN_OFFCAL;
@@ -218,6 +238,11 @@ static int mcp3911_set_offset(struct mcp3911 *adc, int channel, int val)
return adc->chip->enable_offset(adc, 1);
}
+static int mcp3911_get_raw(struct mcp3911 *adc, int channel, s32 *val)
+{
+ return mcp3911_read_s24(adc, MCP3911_CHANNEL(channel), val);
+}
+
static int mcp3910_get_osr(struct mcp3911 *adc, u32 *val)
{
int ret;
@@ -321,12 +346,9 @@ static int mcp3911_read_raw(struct iio_dev *indio_dev,
guard(mutex)(&adc->lock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
- ret = mcp3911_read(adc,
- MCP3911_CHANNEL(channel->channel), val, 3);
+ ret = adc->chip->get_raw(adc, channel->channel, val);
if (ret)
return ret;
-
- *val = sign_extend32(*val, 23);
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
ret = adc->chip->get_offset(adc, channel->channel, val);
@@ -799,6 +821,7 @@ static const struct mcp3911_chip_info mcp3911_chip_info[] = {
.get_offset = mcp3910_get_offset,
.set_offset = mcp3910_set_offset,
.set_scale = mcp3910_set_scale,
+ .get_raw = mcp3910_get_raw,
},
[MCP3911] = {
.channels = mcp3911_channels,
@@ -810,6 +833,7 @@ static const struct mcp3911_chip_info mcp3911_chip_info[] = {
.get_offset = mcp3911_get_offset,
.set_offset = mcp3911_set_offset,
.set_scale = mcp3911_set_scale,
+ .get_raw = mcp3911_get_raw,
},
[MCP3912] = {
.channels = mcp3912_channels,
@@ -821,6 +845,7 @@ static const struct mcp3911_chip_info mcp3911_chip_info[] = {
.get_offset = mcp3910_get_offset,
.set_offset = mcp3910_set_offset,
.set_scale = mcp3910_set_scale,
+ .get_raw = mcp3910_get_raw,
},
[MCP3913] = {
.channels = mcp3913_channels,
@@ -832,6 +857,7 @@ static const struct mcp3911_chip_info mcp3911_chip_info[] = {
.get_offset = mcp3910_get_offset,
.set_offset = mcp3910_set_offset,
.set_scale = mcp3910_set_scale,
+ .get_raw = mcp3910_get_raw,
},
[MCP3914] = {
.channels = mcp3914_channels,
@@ -843,6 +869,7 @@ static const struct mcp3911_chip_info mcp3911_chip_info[] = {
.get_offset = mcp3910_get_offset,
.set_offset = mcp3910_set_offset,
.set_scale = mcp3910_set_scale,
+ .get_raw = mcp3910_get_raw,
},
[MCP3918] = {
.channels = mcp3918_channels,
@@ -854,6 +881,7 @@ static const struct mcp3911_chip_info mcp3911_chip_info[] = {
.get_offset = mcp3910_get_offset,
.set_offset = mcp3910_set_offset,
.set_scale = mcp3910_set_scale,
+ .get_raw = mcp3910_get_raw,
},
[MCP3919] = {
.channels = mcp3919_channels,
@@ -865,6 +893,7 @@ static const struct mcp3911_chip_info mcp3911_chip_info[] = {
.get_offset = mcp3910_get_offset,
.set_offset = mcp3910_set_offset,
.set_scale = mcp3910_set_scale,
+ .get_raw = mcp3910_get_raw,
},
};
static const struct of_device_id mcp3911_dt_ids[] = {
--
2.49.0
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