linux-kernel - [PATCH v4 3/7] iio: potentiometer: Add channel information in device data

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Date:   Sun, 20 Feb 2022 08:16:28 +0530
From:   Jagath Jog J <jagathjog1996@...il.com>
To:     jic23@...nel.org, lars@...afoo.de, andy.shevchenko@...il.com,
        sst@...zta.fm, robh+dt@...nel.org
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/7] iio: potentiometer: Add channel information in device data

Adding each device wiper count and channel information into
device private data.
Utilizing addr member of struct iio_chan_spec to get the
wiper register address so that the value can be read or write
to the same address.

Signed-off-by: Jagath Jog J <jagathjog1996@...il.com>
---
 drivers/iio/potentiometer/ds1803.c | 33 ++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/potentiometer/ds1803.c b/drivers/iio/potentiometer/ds1803.c
index c9cf7181cb7f..cf822e21284e 100644
--- a/drivers/iio/potentiometer/ds1803.c
+++ b/drivers/iio/potentiometer/ds1803.c
@@ -16,7 +16,8 @@
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 
-#define DS1803_WRITE(chan)	(0xa8 | ((chan) + 1))
+#define DS1803_WIPER_0         0xA9
+#define DS1803_WIPER_1         0xAA
 
 enum ds1803_type {
 	DS1803_010,
@@ -25,8 +26,11 @@ enum ds1803_type {
 };
 
 struct ds1803_cfg {
+	int wipers;
 	int avail[3];
 	int kohms;
+	const struct iio_chan_spec *channels;
+	u8 num_channels;
 };
 
 struct ds1803_data {
@@ -34,25 +38,32 @@ struct ds1803_data {
 	const struct ds1803_cfg *cfg;
 };
 
-#define DS1803_CHANNEL(ch) {						\
+#define DS1803_CHANNEL(ch, addr) {					\
 	.type = IIO_RESISTANCE,						\
 	.indexed = 1,							\
 	.output = 1,							\
 	.channel = (ch),						\
+	.address = (addr),						\
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
 	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),		\
 	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW),   \
 }
 
 static const struct iio_chan_spec ds1803_channels[] = {
-	DS1803_CHANNEL(0),
-	DS1803_CHANNEL(1),
+	DS1803_CHANNEL(0, DS1803_WIPER_0),
+	DS1803_CHANNEL(1, DS1803_WIPER_1),
 };
 
 static const struct ds1803_cfg ds1803_cfg[] = {
-	[DS1803_010] = { .avail = { 0, 1, 255 }, .kohms =  10, },
-	[DS1803_050] = { .avail = { 0, 1, 255 }, .kohms =  50, },
-	[DS1803_100] = { .avail = { 0, 1, 255 }, .kohms = 100, },
+	[DS1803_010] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms =  10,
+			 .channels = ds1803_channels,
+			 .num_channels = ARRAY_SIZE(ds1803_channels) },
+	[DS1803_050] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms =  50,
+			 .channels = ds1803_channels,
+			 .num_channels = ARRAY_SIZE(ds1803_channels) },
+	[DS1803_100] = { .wipers = 2, .avail = { 0, 1, 255 }, .kohms = 100,
+			 .channels = ds1803_channels,
+			 .num_channels = ARRAY_SIZE(ds1803_channels) },
 };
 
 static int ds1803_read_raw(struct iio_dev *indio_dev,
@@ -88,7 +99,7 @@ static int ds1803_write_raw(struct iio_dev *indio_dev,
 			    int val, int val2, long mask)
 {
 	struct ds1803_data *data = iio_priv(indio_dev);
-	int pot = chan->channel;
+	u8 addr = chan->address;
 	int max_pos = data->cfg->avail[2];
 
 	if (val2 != 0)
@@ -103,7 +114,7 @@ static int ds1803_write_raw(struct iio_dev *indio_dev,
 		return -EINVAL;
 	}
 
-	return i2c_smbus_write_byte_data(data->client, DS1803_WRITE(pot), val);
+	return i2c_smbus_write_byte_data(data->client, addr, val);
 }
 
 static int ds1803_read_avail(struct iio_dev *indio_dev,
@@ -146,8 +157,8 @@ static int ds1803_probe(struct i2c_client *client, const struct i2c_device_id *i
 	data->cfg = &ds1803_cfg[id->driver_data];
 
 	indio_dev->info = &ds1803_info;
-	indio_dev->channels = ds1803_channels;
-	indio_dev->num_channels = ARRAY_SIZE(ds1803_channels);
+	indio_dev->channels = data->cfg->channels;
+	indio_dev->num_channels = data->cfg->num_channels;
 	indio_dev->name = client->name;
 
 	return devm_iio_device_register(dev, indio_dev);
-- 
2.17.1