Bluetooth: hci_qca: Add qcomm devcoredump sysfs support

This patch implements the hci_qca driver side .coredump() callback to
trigger a devcoredump via sysfs and .enable_coredump() callback to
check if the devcoredump functionality is enabled for a device.

Signed-off-by: Sai Teja Aluvala <quic_saluvala@quicinc.com>
Reviewed-by: Manish Mandlik <mmandlik@google.com>

drivers/bluetooth/hci_qca.c

@@ -1697,6 +1697,15 @@ static int qca_power_on(struct hci_dev *hdev)
 	return ret;
 }
 
+#ifdef CONFIG_DEV_COREDUMP
+static bool hciqca_coredump_enabled(struct hci_dev *hdev)
+{
+	struct hci_uart *hu = hci_get_drvdata(hdev);
+
+	return !hu->serdev->dev.coredump_disabled;
+}
+#endif
+
 static int qca_setup(struct hci_uart *hu)
 {
 	struct hci_dev *hdev = hu->hdev;
@@ -1772,6 +1781,9 @@ static int qca_setup(struct hci_uart *hu)
 		qca_debugfs_init(hdev);
 		hu->hdev->hw_error = qca_hw_error;
 		hu->hdev->cmd_timeout = qca_cmd_timeout;
+#ifdef CONFIG_DEV_COREDUMP
+		hu->hdev->dump.enabled = hciqca_coredump_enabled;
+#endif
 		if (device_can_wakeup(hu->serdev->ctrl->dev.parent))
 			hu->hdev->wakeup = qca_wakeup;
 	} else if (ret == -ENOENT) {
@@ -2351,6 +2363,18 @@ static const struct acpi_device_id qca_bluetooth_acpi_match[] = {
 MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match);
 #endif
 
+#ifdef CONFIG_DEV_COREDUMP
+static void hciqca_coredump(struct device *dev)
+{
+	struct serdev_device *serdev = to_serdev_device(dev);
+	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
+	struct hci_uart *hu = &qcadev->serdev_hu;
+	struct hci_dev  *hdev = hu->hdev;
+
+	if (!dev->coredump_disabled && hdev->dump.coredump)
+		hdev->dump.coredump(hdev);
+}
+#endif
 
 static struct serdev_device_driver qca_serdev_driver = {
 	.probe = qca_serdev_probe,
@@ -2361,6 +2385,9 @@ static struct serdev_device_driver qca_serdev_driver = {
 		.acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
 		.shutdown = qca_serdev_shutdown,
 		.pm = &qca_pm_ops,
+#ifdef CONFIG_DEV_COREDUMP
+		.coredump = hciqca_coredump,
+#endif
 	},
 };