iio: temperature: tmp117: Convert enum->pointer for data in the match tables

Convert enum->pointer for data in the match tables, so that
device_get_match_data() can do match against OF/ACPI/I2C tables, once i2c
bus type match support added to it.

Add struct tmp11x_info and replace enum->struct *tmp11x_info for data in
the match table. Drop tmp117_identify() and simplify tmp117_probe() by
replacing device_get_match_data() and id lookup for retrieving data by
i2c_get_match_data().

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.kernel.org/r/20230812161154.196555-1-biju.das.jz@bp.renesas.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/temperature/tmp117.c

@@ -42,6 +42,12 @@ struct tmp117_data {
 	s16 calibbias;
 };
 
+struct tmp11x_info {
+	const char *name;
+	struct iio_chan_spec const *channels;
+	int num_channels;
+};
+
 static int tmp117_read_raw(struct iio_dev *indio_dev,
 			   struct iio_chan_spec const *channel, int *val,
 			   int *val2, long mask)
@@ -119,57 +125,54 @@ static const struct iio_chan_spec tmp116_channels[] = {
 	},
 };
 
+static const struct tmp11x_info tmp116_channels_info = {
+	.name = "tmp116",
+	.channels = tmp116_channels,
+	.num_channels = ARRAY_SIZE(tmp116_channels)
+};
+
+static const struct tmp11x_info tmp117_channels_info = {
+	.name = "tmp117",
+	.channels = tmp117_channels,
+	.num_channels = ARRAY_SIZE(tmp117_channels)
+};
+
 static const struct iio_info tmp117_info = {
 	.read_raw = tmp117_read_raw,
 	.write_raw = tmp117_write_raw,
 };
 
-static int tmp117_identify(struct i2c_client *client)
+static int tmp117_probe(struct i2c_client *client)
 {
-	const struct i2c_device_id *id;
+	const struct tmp11x_info *match_data;
-	unsigned long match_data;
+	struct tmp117_data *data;
+	struct iio_dev *indio_dev;
 	int dev_id;
 
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+		return -EOPNOTSUPP;
+
 	dev_id = i2c_smbus_read_word_swapped(client, TMP117_REG_DEVICE_ID);
 	if (dev_id < 0)
 		return dev_id;
 
 	switch (dev_id) {
 	case TMP116_DEVICE_ID:
+		match_data = &tmp116_channels_info;
+		break;
 	case TMP117_DEVICE_ID:
-		return dev_id;
+		match_data = &tmp117_channels_info;
-	}
+		break;
-
+	default:
-	dev_info(&client->dev, "Unknown device id (0x%x), use fallback compatible\n",
+		dev_info(&client->dev,
+			 "Unknown device id (0x%x), use fallback compatible\n",
 			 dev_id);
-
+		match_data = i2c_get_match_data(client);
-	match_data = (uintptr_t)device_get_match_data(&client->dev);
-	if (match_data)
-		return match_data;
-
-	id = i2c_client_get_device_id(client);
-	if (id)
-		return id->driver_data;
-
-	dev_err(&client->dev, "Failed to identify unsupported device\n");
-
-	return -ENODEV;
 	}
 
-static int tmp117_probe(struct i2c_client *client)
+	if (!match_data)
-{
+		return dev_err_probe(&client->dev, -ENODEV,
-	struct tmp117_data *data;
+				     "Failed to identify unsupported device\n");
-	struct iio_dev *indio_dev;
-	int ret, dev_id;
-
-	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
-		return -EOPNOTSUPP;
-
-	ret = tmp117_identify(client);
-	if (ret < 0)
-		return ret;
-
-	dev_id = ret;
 
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
@@ -181,33 +184,24 @@ static int tmp117_probe(struct i2c_client *client)
 
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &tmp117_info;
+	indio_dev->channels = match_data->channels;
+	indio_dev->num_channels = match_data->num_channels;
+	indio_dev->name = match_data->name;
 
-	switch (dev_id) {
-	case TMP116_DEVICE_ID:
-		indio_dev->channels = tmp116_channels;
-		indio_dev->num_channels = ARRAY_SIZE(tmp116_channels);
-		indio_dev->name = "tmp116";
-		break;
-	case TMP117_DEVICE_ID:
-		indio_dev->channels = tmp117_channels;
-		indio_dev->num_channels = ARRAY_SIZE(tmp117_channels);
-		indio_dev->name = "tmp117";
-		break;
-	}
 
 	return devm_iio_device_register(&client->dev, indio_dev);
 }
 
 static const struct of_device_id tmp117_of_match[] = {
-	{ .compatible = "ti,tmp116", .data = (void *)TMP116_DEVICE_ID },
+	{ .compatible = "ti,tmp116", .data = &tmp116_channels_info },
-	{ .compatible = "ti,tmp117", .data = (void *)TMP117_DEVICE_ID },
+	{ .compatible = "ti,tmp117", .data = &tmp117_channels_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, tmp117_of_match);
 
 static const struct i2c_device_id tmp117_id[] = {
-	{ "tmp116", TMP116_DEVICE_ID },
+	{ "tmp116", (kernel_ulong_t)&tmp116_channels_info },
-	{ "tmp117", TMP117_DEVICE_ID },
+	{ "tmp117", (kernel_ulong_t)&tmp117_channels_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tmp117_id);