linux-kernel - [PATCH v4 4/5] iio: accel: mc3230: add multiple devices support

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Message-Id: <20250113-mainlining-mc3510c-v4-4-4118411ef569@gmail.com>
Date: Mon, 13 Jan 2025 17:02:03 +0300
From: Vasiliy Doylov via B4 Relay <devnull+nekodevelopper.gmail.com@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>, 
 Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, Vasiliy Doylov <nekodevelopper@...il.com>
Subject: [PATCH v4 4/5] iio: accel: mc3230: add multiple devices support

From: Vasiliy Doylov <nekodevelopper@...il.com>

Refactor code to support multiple generations of MCUBE devices by
defining name, chip id and product code in mc3230_chip_info struct.

Signed-off-by: Vasiliy Doylov <nekodevelopper@...il.com>
---
 drivers/iio/accel/mc3230.c | 52 +++++++++++++++++++++++++++++++++-------------
 1 file changed, 38 insertions(+), 14 deletions(-)

diff --git a/drivers/iio/accel/mc3230.c b/drivers/iio/accel/mc3230.c
index 443b5b30c83144478c27a86dbdc12e4e944a34df..c8d394c3ecf08fad60f0f2ae7be6fd992327d843 100644
--- a/drivers/iio/accel/mc3230.c
+++ b/drivers/iio/accel/mc3230.c
@@ -22,20 +22,29 @@
 #define MC3230_MODE_OPCON_STANDBY	0x03
 
 #define MC3230_REG_CHIP_ID		0x18
-#define MC3230_CHIP_ID			0x01
-
 #define MC3230_REG_PRODUCT_CODE		0x3b
-#define MC3230_PRODUCT_CODE		0x19
 
 /*
  * The accelerometer has one measurement range:
  *
  * -1.5g - +1.5g (8-bit, signed)
  *
- * scale = (1.5 + 1.5) * 9.81 / (2^8 - 1)	= 0.115411765
  */
 
-static const int mc3230_nscale = 115411765;
+struct mc3230_chip_info {
+	const char *name;
+	const u8 chip_id;
+	const u8 product_code;
+	const int scale;
+};
+
+static const struct mc3230_chip_info mc3230_chip_info = {
+	.name = "mc3230",
+	.chip_id = 0x01,
+	.product_code = 0x19,
+	/* (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.115411765 */
+	.scale = 115411765,
+};
 
 #define MC3230_CHANNEL(reg, axis) {	\
 	.type = IIO_ACCEL,	\
@@ -48,6 +57,7 @@ static const int mc3230_nscale = 115411765;
 }
 
 struct mc3230_data {
+	const struct mc3230_chip_info *chip_info;
 	struct i2c_client *client;
 	struct iio_mount_matrix orientation;
 };
@@ -111,7 +121,7 @@ static int mc3230_read_raw(struct iio_dev *indio_dev,
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		*val = 0;
-		*val2 = mc3230_nscale;
+		*val2 = data->chip_info->scale;
 		return IIO_VAL_INT_PLUS_NANO;
 	default:
 		return -EINVAL;
@@ -127,15 +137,28 @@ static int mc3230_probe(struct i2c_client *client)
 	int ret;
 	struct iio_dev *indio_dev;
 	struct mc3230_data *data;
+	const struct mc3230_chip_info *chip_info;
+
+	chip_info = i2c_get_match_data(client);
+	if (chip_info == NULL) {
+		dev_err(&client->dev, "failed to get match data");
+		return -ENODATA;
+	}
 
 	/* First check chip-id and product-id */
 	ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID);
-	if (ret != MC3230_CHIP_ID)
-		return (ret < 0) ? ret : -ENODEV;
+	if (ret != chip_info->chip_id) {
+		dev_info(&client->dev,
+			"chip id check fail: 0x%x != 0x%x !\n",
+			ret, chip_info->chip_id);
+	}
 
 	ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE);
-	if (ret != MC3230_PRODUCT_CODE)
-		return (ret < 0) ? ret : -ENODEV;
+	if (ret != chip_info->product_code) {
+		dev_info(&client->dev,
+			"product code check fail: 0x%x != 0x%x !\n",
+			ret, chip_info->product_code);
+	}
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev) {
@@ -144,11 +167,12 @@ static int mc3230_probe(struct i2c_client *client)
 	}
 
 	data = iio_priv(indio_dev);
+	data->chip_info = chip_info;
 	data->client = client;
 	i2c_set_clientdata(client, indio_dev);
 
 	indio_dev->info = &mc3230_info;
-	indio_dev->name = "mc3230";
+	indio_dev->name = chip_info->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = mc3230_channels;
 	indio_dev->num_channels = ARRAY_SIZE(mc3230_channels);
@@ -200,13 +224,13 @@ static int mc3230_resume(struct device *dev)
 static DEFINE_SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume);
 
 static const struct i2c_device_id mc3230_i2c_id[] = {
-	{ "mc3230" },
-	{}
+	{ "mc3230", (kernel_ulong_t)&mc3230_chip_info },
+	{ }
 };
 MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id);
 
 static const struct of_device_id mc3230_of_match[] = {
-	{ .compatible = "mcube,mc3230" },
+	{ .compatible = "mcube,mc3230", &mc3230_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, mc3230_of_match);

-- 
2.47.1