[PATCH v4 1/8] iio: imu: adis: Add optional self_test callback

[Radu Sabau via B4 Relay <devnull+radu.sabau.analog.com@kernel.org>]

From: Radu Sabau <radu.sabau@analog.com>

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.

Signed-off-by: Radu Sabau <radu.sabau@analog.com>
---
 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 a2bc1d14ed91..388518ebba2e 100644
--- a/drivers/iio/imu/adis.c
+++ b/drivers/iio/imu/adis.c
@@ -360,6 +360,9 @@ 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 bfb6df68e6c9..14f9b304c252 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -51,6 +51,12 @@ 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
@@ -81,6 +87,7 @@ 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