[PATCH v5 2/8] iio: imu: adis: Add optional self_test callback

[Radu Sabau via B4 Relay]

From: Radu Sabau <radu.sabau@xxxxxxxxxx>

Add an optional self_test callback to struct adis_data, for devices
whose self-test doesn't fit the generic mask-write/sleep/check-status
sequence. Purely additive: defaults to NULL, no change for existing
drivers.

Reviewed-by: Nuno Sá <nuno.sa@xxxxxxxxxx>
Signed-off-by: Radu Sabau <radu.sabau@xxxxxxxxxx>
---
 drivers/iio/imu/adis.c       | 3 +++
 include/linux/iio/imu/adis.h | 7 +++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
index 793e3b6b0ea7..5c3bb7259037 100644
--- a/drivers/iio/imu/adis.c
+++ b/drivers/iio/imu/adis.c
@@ -357,6 +357,9 @@ static int adis_self_test(struct adis *adis)
 	int ret;
 	const struct adis_timeout *timeouts = adis->data->timeouts;
 
+	if (adis->data->self_test)
+		return adis->data->self_test(adis);
+
 	ret = __adis_write_reg_16(adis, adis->data->self_test_reg,
 				  adis->data->self_test_mask);
 	if (ret) {
diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index 97323b8d1cb3..c09b381eb619 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -52,6 +52,12 @@ struct adis_timeout {
  * @self_test_mask: Bitmask of supported self-test operations
  * @self_test_reg: Register address to request self test command
  * @self_test_no_autoclear: True if device's self-test needs clear of ctrl reg
+ * @self_test: Optional device-specific self-test override. When set,
+ *		it is called instead of the generic mask-write/sleep/
+ *		check-status sequence. The callback owns its own pass/fail
+ *		determination entirely (it should call __adis_check_status()
+ *		itself if it wants status-register checks). Must return 0 on
+ *		success, a negative error code otherwise.
  * @status_error_msgs: Array of error messages
  * @status_error_mask: Bitmask of errors supported by the device
  * @timeouts: Chip specific delays
@@ -82,6 +88,7 @@ struct adis_data {
 	unsigned int self_test_mask;
 	unsigned int self_test_reg;
 	bool self_test_no_autoclear;
+	int (*self_test)(struct adis *adis);
 	const struct adis_timeout *timeouts;
 
 	const char * const *status_error_msgs;

-- 
2.43.0