iio: light: vcnl4000: Make irq handling more generic

This driver supports 4 chips, by which only one (vcnl4010) handles
interrupts and has support for triggered buffer. The setup of these
functions is hardcoded for vcnl4010 inside the generic vcnl4000_probe,
and thus ignores the chip specific configuration structure where all
other chip specific functions are specified.

This complicates adding interrupt handler and triggered buffer support
to chips which may have support for it.

Add members for irq threads and iio_buffer_setup_ops to the generic
vcnl4000_chip_spec struct, so that instead of checking a chip specific
boolean irq support, we check for a chip specific triggered buffer
handler, and/or a chip specific irq thread handler.
Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230117190017.3789181-3-marten.lindahl@axis.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/light/vcnl4000.c

@@ -150,11 +150,13 @@ struct vcnl4000_chip_spec {
 	struct iio_chan_spec const *channels;
 	const int num_channels;
 	const struct iio_info *info;
-	bool irq_support;
+	const struct iio_buffer_setup_ops *buffer_setup_ops;
 	int (*init)(struct vcnl4000_data *data);
 	int (*measure_light)(struct vcnl4000_data *data, int *val);
 	int (*measure_proximity)(struct vcnl4000_data *data, int *val);
 	int (*set_power_state)(struct vcnl4000_data *data, bool on);
+	irqreturn_t (*irq_thread)(int irq, void *priv);
+	irqreturn_t (*trig_buffer_func)(int irq, void *priv);
 };
 
 static const struct i2c_device_id vcnl4000_id[] = {
@@ -1121,7 +1123,6 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
 		.channels = vcnl4000_channels,
 		.num_channels = ARRAY_SIZE(vcnl4000_channels),
 		.info = &vcnl4000_info,
-		.irq_support = false,
 	},
 	[VCNL4010] = {
 		.prod = "VCNL4010/4020",
@@ -1132,7 +1133,9 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
 		.channels = vcnl4010_channels,
 		.num_channels = ARRAY_SIZE(vcnl4010_channels),
 		.info = &vcnl4010_info,
-		.irq_support = true,
+		.irq_thread = vcnl4010_irq_thread,
+		.trig_buffer_func = vcnl4010_trigger_handler,
+		.buffer_setup_ops = &vcnl4010_buffer_ops,
 	},
 	[VCNL4040] = {
 		.prod = "VCNL4040",
@@ -1143,7 +1146,6 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
 		.channels = vcnl4040_channels,
 		.num_channels = ARRAY_SIZE(vcnl4040_channels),
 		.info = &vcnl4040_info,
-		.irq_support = false,
 	},
 	[VCNL4200] = {
 		.prod = "VCNL4200",
@@ -1154,7 +1156,6 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
 		.channels = vcnl4000_channels,
 		.num_channels = ARRAY_SIZE(vcnl4000_channels),
 		.info = &vcnl4000_info,
-		.irq_support = false,
 	},
 };
 
@@ -1214,22 +1215,25 @@ static int vcnl4000_probe(struct i2c_client *client)
 	indio_dev->name = VCNL4000_DRV_NAME;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 
-	if (client->irq && data->chip_spec->irq_support) {
+	if (data->chip_spec->trig_buffer_func &&
+	    data->chip_spec->buffer_setup_ops) {
 		ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
 						      NULL,
-						      vcnl4010_trigger_handler,
-						      &vcnl4010_buffer_ops);
+						      data->chip_spec->trig_buffer_func,
+						      data->chip_spec->buffer_setup_ops);
 		if (ret < 0) {
 			dev_err(&client->dev,
 				"unable to setup iio triggered buffer\n");
 			return ret;
 		}
+	}
 
+	if (client->irq && data->chip_spec->irq_thread) {
 		ret = devm_request_threaded_irq(&client->dev, client->irq,
-						NULL, vcnl4010_irq_thread,
+						NULL, data->chip_spec->irq_thread,
 						IRQF_TRIGGER_FALLING |
 						IRQF_ONESHOT,
-						"vcnl4010_irq",
+						"vcnl4000_irq",
 						indio_dev);
 		if (ret < 0) {
 			dev_err(&client->dev, "irq request failed\n");