[PATCH v2 2/3] iio: adc128s052: add ACPI _HID AANT1280

[Javier Arteaga <javier@emutex.com>]

From: Nicola Lunghi <nicola.lunghi@emutex.com>

ACPI _HID AANT1280 matches an ADC124S101 present on E3940 SKUs of the UP
Squared board.

Add it to the driver.

Signed-off-by: Nicola Lunghi <nicola.lunghi@emutex.com>
[javier@emutex.com: fix up commit message and one checkpatch warning]
Signed-off-by: Javier Arteaga <javier@emutex.com>
---
 drivers/iio/adc/ti-adc128s052.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
index e6716c326c5e..bc5096e98900 100644
--- a/drivers/iio/adc/ti-adc128s052.c
+++ b/drivers/iio/adc/ti-adc128s052.c
@@ -12,6 +12,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/acpi.h>
 #include <linux/err.h>
 #include <linux/spi/spi.h>
 #include <linux/module.h>
@@ -136,9 +137,22 @@ static int adc128_probe(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev;
 	struct adc128 *adc;
-	int config = spi_get_device_id(spi)->driver_data;
+	int config;
 	int ret;
 
+	if (ACPI_COMPANION(&spi->dev)) {
+		const struct acpi_device_id *ad_id;
+
+		ad_id = acpi_match_device(spi->dev.driver->acpi_match_table,
+					  &spi->dev);
+		if (!ad_id)
+			return -ENODEV;
+
+		config = ad_id->driver_data;
+	} else {
+		config = spi_get_device_id(spi)->driver_data;
+	}
+
 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
 	if (!indio_dev)
 		return -ENOMEM;
@@ -207,10 +221,19 @@ static const struct spi_device_id adc128_id[] = {
 };
 MODULE_DEVICE_TABLE(spi, adc128_id);
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id adc128_acpi_match[] = {
+	{ "AANT1280", 2 }, /* ADC124S021 compatible ACPI ID */
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, adc128_acpi_match);
+#endif
+
 static struct spi_driver adc128_driver = {
 	.driver = {
 		.name = "adc128s052",
 		.of_match_table = of_match_ptr(adc128_of_match),
+		.acpi_match_table = ACPI_PTR(adc128_acpi_match),
 	},
 	.probe = adc128_probe,
 	.remove = adc128_remove,
-- 
2.17.0