From: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
This change adds a basic verification of the EEPROM by writing a known
value to the customer version ID register, and reading it back.
This validates that the EEPROM & SPI communication are functioning
properly, and the device is ready to use.
Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---
drivers/iio/frequency/ad9523.c | 28 ++++++++++++++++++++++++++++
1 file changed, 28 insertions(+)
diff --git a/drivers/iio/frequency/ad9523.c b/drivers/iio/frequency/ad9523.c
index 9b9eee27176c..dd159a1237f3 100644
--- a/drivers/iio/frequency/ad9523.c
+++ b/drivers/iio/frequency/ad9523.c
@@ -749,6 +749,30 @@ static int ad9523_reg_access(struct iio_dev *indio_dev,
return ret;
}
+static int ad9523_verify_eeprom(struct iio_dev *indio_dev)
+{
+ int ret, id;
+
+ id = ad9523_read(indio_dev, AD9523_EEPROM_CUSTOMER_VERSION_ID);
+ if (id < 0)
+ return id;
+
+ ret = ad9523_write(indio_dev, AD9523_EEPROM_CUSTOMER_VERSION_ID, 0xAD95);
+ if (ret < 0)
+ return ret;
+
+ ret = ad9523_read(indio_dev, AD9523_EEPROM_CUSTOMER_VERSION_ID);
+ if (ret < 0)
+ return ret;
+
+ if (ret != 0xAD95) {
+ dev_err(&indio_dev->dev, "SPI Read Verify failed (0x%X)\n", ret);
+ return -EIO;
+ }
+
+ return ad9523_write(indio_dev, AD9523_EEPROM_CUSTOMER_VERSION_ID, id);
+}
+
static const struct iio_info ad9523_info = {
.read_raw = &ad9523_read_raw,
.write_raw = &ad9523_write_raw,
@@ -780,6 +804,10 @@ static int ad9523_setup(struct iio_dev *indio_dev)
if (ret < 0)
return ret;
+ ret = ad9523_verify_eeprom(indio_dev);
+ if (ret < 0)
+ return ret;
+
/*
* PLL1 Setup
*/
--
2.17.1
