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

[Javier Arteaga]

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

ACPI _HID AANT1280 matches an ADC124S101 present on the UP Squared board
that is compatible with adc128s052.

Add it to the driver.

Signed-off-by: Nicola Lunghi <nicola.lun...@emutex.com>
[jav...@emutex.com: fix up commit message and one checkpatch warning]
Signed-off-by: Javier Arteaga <jav...@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 56ec04d1c68f..917273f1268c 100644
--- a/drivers/iio/adc/ti-adc128s052.c
+++ b/drivers/iio/adc/ti-adc128s052.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/iio/iio.h>
 #include <linux/regulator/consumer.h>
+#include <linux/acpi.h>
 
 struct adc128_configuration {
        const struct iio_chan_spec      *channels;
@@ -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;
@@ -199,10 +213,19 @@ 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 = adc128_of_match,
+               .acpi_match_table = ACPI_PTR(adc128_acpi_match),
        },
        .probe = adc128_probe,
        .remove = adc128_remove,
-- 
2.17.0