[PATCH v3 2/2] platform/surface: aggregator: Log critical errors during SAM probing

[Weifeng Liu <weifeng.liu.z@xxxxxxxxx>]

Emits messages upon errors during probing of SAM.  Hopefully this could
provide useful context to user for the purpose of diagnosis when
something miserable happen.

Reviewed-by: Maximilian Luz <luzmaximilian@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Weifeng Liu <weifeng.liu.z@xxxxxxxxx>
---
 drivers/platform/surface/aggregator/core.c | 42 ++++++++++++++--------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/drivers/platform/surface/aggregator/core.c b/drivers/platform/surface/aggregator/core.c
index 7b1871eb7a6f..046fa63446bf 100644
--- a/drivers/platform/surface/aggregator/core.c
+++ b/drivers/platform/surface/aggregator/core.c
@@ -618,15 +618,17 @@ static const struct acpi_gpio_mapping ssam_acpi_gpios[] = {
 
 static int ssam_serial_hub_probe(struct serdev_device *serdev)
 {
-	struct acpi_device *ssh = ACPI_COMPANION(&serdev->dev);
+	struct device *dev = &serdev->dev;
+	struct acpi_device *ssh = ACPI_COMPANION(dev);
 	struct ssam_controller *ctrl;
 	acpi_status astatus;
 	int status;
 
-	if (gpiod_count(&serdev->dev, NULL) < 0)
-		return -ENODEV;
+	status = gpiod_count(dev, NULL);
+	if (status < 0)
+		return dev_err_probe(dev, status, "no GPIO found\n");
 
-	status = devm_acpi_dev_add_driver_gpios(&serdev->dev, ssam_acpi_gpios);
+	status = devm_acpi_dev_add_driver_gpios(dev, ssam_acpi_gpios);
 	if (status)
 		return status;
 
@@ -637,8 +639,11 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)
 
 	/* Initialize controller. */
 	status = ssam_controller_init(ctrl, serdev);
-	if (status)
+	if (status) {
+		dev_err_probe(dev, status,
+			      "failed to initialize ssam controller\n");
 		goto err_ctrl_init;
+	}
 
 	ssam_controller_lock(ctrl);
 
@@ -657,14 +662,13 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)
 	if (status == -ENXIO)
 		status = -EPROBE_DEFER;
 	if (status) {
-		dev_err_probe(&serdev->dev, status,
-			      "failed to open serdev device\n");
+		dev_err_probe(dev, status, "failed to open serdev device\n");
 		goto err_devopen;
 	}
 
 	astatus = ssam_serdev_setup_via_acpi(ssh->handle, serdev);
 	if (ACPI_FAILURE(astatus)) {
-		status = -ENXIO;
+		status = dev_err_probe(dev, -ENXIO, "failed to setup serdev\n");
 		goto err_devinit;
 	}
 
@@ -680,25 +684,33 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)
 	 * states.
 	 */
 	status = ssam_log_firmware_version(ctrl);
-	if (status)
+	if (status) {
+		dev_err_probe(dev, status, "failed to get firmware version\n");
 		goto err_initrq;
+	}
 
 	status = ssam_ctrl_notif_d0_entry(ctrl);
-	if (status)
+	if (status) {
+		dev_err_probe(dev, status, "D0-entry notification failed\n");
 		goto err_initrq;
+	}
 
 	status = ssam_ctrl_notif_display_on(ctrl);
-	if (status)
+	if (status) {
+		dev_err_probe(dev, status, "display-on notification failed\n");
 		goto err_initrq;
+	}
 
-	status = sysfs_create_group(&serdev->dev.kobj, &ssam_sam_group);
+	status = sysfs_create_group(&dev->kobj, &ssam_sam_group);
 	if (status)
 		goto err_initrq;
 
 	/* Set up IRQ. */
 	status = ssam_irq_setup(ctrl);
-	if (status)
+	if (status) {
+		dev_err_probe(dev, status, "failed to setup IRQ\n");
 		goto err_irq;
+	}
 
 	/* Finally, set main controller reference. */
 	status = ssam_try_set_controller(ctrl);
@@ -715,7 +727,7 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)
 	 *       resumed. In short, this causes some spurious unwanted wake-ups.
 	 *       For now let's thus default power/wakeup to false.
 	 */
-	device_set_wakeup_capable(&serdev->dev, true);
+	device_set_wakeup_capable(dev, true);
 	acpi_dev_clear_dependencies(ssh);
 
 	return 0;
@@ -723,7 +735,7 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)
 err_mainref:
 	ssam_irq_free(ctrl);
 err_irq:
-	sysfs_remove_group(&serdev->dev.kobj, &ssam_sam_group);
+	sysfs_remove_group(&dev->kobj, &ssam_sam_group);
 err_initrq:
 	ssam_controller_lock(ctrl);
 	ssam_controller_shutdown(ctrl);
-- 
2.44.0