iio: adc: ti-ads1015: Convert to OF match data

Replace chip type enumeration in match data with pointer to static constant
structure which contains all the different chip properties in one place, and
then replace handling of chip type in probe() with simple copy of fields in
the new match data structure into struct iio_dev.

This reduces code and increases static data.
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Cc: Daniel Baluta <daniel.baluta@nxp.com>
Link: https://lore.kernel.org/r/20220328194725.149150-8-marex@denx.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ti-ads1015.c

@@ -76,11 +76,12 @@
 #define ADS1015_DEFAULT_DATA_RATE	4
 #define ADS1015_DEFAULT_CHAN		0
 
-enum chip_ids {
-	ADSXXXX = 0,
-	ADS1015,
-	ADS1115,
-	TLA2024,
+struct ads1015_chip_data {
+	struct iio_chan_spec const	*channels;
+	int				num_channels;
+	const struct iio_info		*info;
+	const int			*data_rate;
+	bool				has_comparator;
 };
 
 enum ads1015_channels {
@@ -95,11 +96,11 @@ enum ads1015_channels {
 	ADS1015_TIMESTAMP,
 };
 
-static const unsigned int ads1015_data_rate[] = {
+static const int ads1015_data_rate[] = {
 	128, 250, 490, 920, 1600, 2400, 3300, 3300
 };
 
-static const unsigned int ads1115_data_rate[] = {
+static const int ads1115_data_rate[] = {
 	8, 16, 32, 64, 128, 250, 475, 860
 };
 
@@ -226,7 +227,7 @@ struct ads1015_data {
 	unsigned int comp_mode;
 	struct ads1015_thresh_data thresh_data[ADS1015_CHANNELS];
 
-	unsigned int *data_rate;
+	const int *data_rate;
 	/*
 	 * Set to true when the ADC is switched to the continuous-conversion
 	 * mode and exits from a power-down state.  This flag is used to avoid
@@ -961,12 +962,18 @@ static int ads1015_set_conv_mode(struct ads1015_data *data, int mode)
 static int ads1015_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
+	const struct ads1015_chip_data *chip;
 	struct iio_dev *indio_dev;
 	struct ads1015_data *data;
 	int ret;
-	enum chip_ids chip;
 	int i;
 
+	chip = device_get_match_data(&client->dev);
+	if (!chip)
+		chip = (const struct ads1015_chip_data *)id->driver_data;
+	if (!chip)
+		return dev_err_probe(&client->dev, -EINVAL, "Unknown chip\n");
+
 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
 		return -ENOMEM;
@@ -979,34 +986,12 @@ static int ads1015_probe(struct i2c_client *client,
 	indio_dev->name = ADS1015_DRV_NAME;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	chip = (uintptr_t)device_get_match_data(&client->dev);
-	if (chip == ADSXXXX)
-		chip = id->driver_data;
-	switch (chip) {
-	case ADS1015:
-		indio_dev->channels = ads1015_channels;
-		indio_dev->num_channels = ARRAY_SIZE(ads1015_channels);
-		indio_dev->info = &ads1015_info;
-		data->data_rate = (unsigned int *) &ads1015_data_rate;
-		break;
-	case ADS1115:
-		indio_dev->channels = ads1115_channels;
-		indio_dev->num_channels = ARRAY_SIZE(ads1115_channels);
-		indio_dev->info = &ads1115_info;
-		data->data_rate = (unsigned int *) &ads1115_data_rate;
-		break;
-	case TLA2024:
-		indio_dev->channels = tla2024_channels;
-		indio_dev->num_channels = ARRAY_SIZE(tla2024_channels);
-		indio_dev->info = &tla2024_info;
-		data->data_rate = (unsigned int *) &ads1015_data_rate;
-		break;
-	default:
-		dev_err(&client->dev, "Unknown chip %d\n", chip);
-		return -EINVAL;
-	}
-
+	indio_dev->channels = chip->channels;
+	indio_dev->num_channels = chip->num_channels;
+	indio_dev->info = chip->info;
+	data->data_rate = chip->data_rate;
 	data->event_channel = ADS1015_CHANNELS;
+
 	/*
 	 * Set default lower and upper threshold to min and max value
 	 * respectively.
@@ -1021,9 +1006,9 @@ static int ads1015_probe(struct i2c_client *client,
 	/* we need to keep this ABI the same as used by hwmon ADS1015 driver */
 	ads1015_get_channels_config(client);
 
-	data->regmap = devm_regmap_init_i2c(client, (chip == TLA2024) ?
-					    &tla2024_regmap_config :
-					    &ads1015_regmap_config);
+	data->regmap = devm_regmap_init_i2c(client, chip->has_comparator ?
+					    &ads1015_regmap_config :
+					    &tla2024_regmap_config);
 	if (IS_ERR(data->regmap)) {
 		dev_err(&client->dev, "Failed to allocate register map\n");
 		return PTR_ERR(data->regmap);
@@ -1037,7 +1022,7 @@ static int ads1015_probe(struct i2c_client *client,
 		return ret;
 	}
 
-	if (client->irq && chip != TLA2024) {
+	if (client->irq && chip->has_comparator) {
 		unsigned long irq_trig =
 			irqd_get_trigger_type(irq_get_irq_data(client->irq));
 		unsigned int cfg_comp_mask = ADS1015_CFG_COMP_QUE_MASK |
@@ -1136,27 +1121,42 @@ static const struct dev_pm_ops ads1015_pm_ops = {
 			   ads1015_runtime_resume, NULL)
 };
 
+static const struct ads1015_chip_data ads1015_data = {
+	.channels	= ads1015_channels,
+	.num_channels	= ARRAY_SIZE(ads1015_channels),
+	.info		= &ads1015_info,
+	.data_rate	= ads1015_data_rate,
+	.has_comparator	= true,
+};
+
+static const struct ads1015_chip_data ads1115_data = {
+	.channels	= ads1115_channels,
+	.num_channels	= ARRAY_SIZE(ads1115_channels),
+	.info		= &ads1115_info,
+	.data_rate	= ads1115_data_rate,
+	.has_comparator	= true,
+};
+
+static const struct ads1015_chip_data tla2024_data = {
+	.channels	= tla2024_channels,
+	.num_channels	= ARRAY_SIZE(tla2024_channels),
+	.info		= &tla2024_info,
+	.data_rate	= ads1015_data_rate,
+	.has_comparator	= false,
+};
+
 static const struct i2c_device_id ads1015_id[] = {
-	{"ads1015", ADS1015},
-	{"ads1115", ADS1115},
-	{"tla2024", TLA2024},
+	{ "ads1015", (kernel_ulong_t)&ads1015_data },
+	{ "ads1115", (kernel_ulong_t)&ads1115_data },
+	{ "tla2024", (kernel_ulong_t)&tla2024_data },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, ads1015_id);
 
 static const struct of_device_id ads1015_of_match[] = {
-	{
-		.compatible = "ti,ads1015",
-		.data = (void *)ADS1015
-	},
-	{
-		.compatible = "ti,ads1115",
-		.data = (void *)ADS1115
-	},
-	{
-		.compatible = "ti,tla2024",
-		.data = (void *)TLA2024
-	},
+	{ .compatible = "ti,ads1015", .data = &ads1015_data },
+	{ .compatible = "ti,ads1115", .data = &ads1115_data },
+	{ .compatible = "ti,tla2024", .data = &tla2024_data },
 	{}
 };
 MODULE_DEVICE_TABLE(of, ads1015_of_match);