PCI: Add pci_irq_type() to query the allocated interrupt typegrafted

Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 46 insertions, 0 deletions

diff --git a/drivers/tty/ipwireless/tty.h b/drivers/tty/ipwireless/tty.h
new file mode 100644
index 000000000..ec698d9f3
--- /dev/null
+++ b/drivers/tty/ipwireless/tty.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * IPWireless 3G PCMCIA Network Driver
+ *
+ * Original code
+ *   by Stephen Blackheath <stephen@blacksapphire.com>,
+ *      Ben Martel <benm@symmetric.co.nz>
+ *
+ * Copyrighted as follows:
+ *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
+ *
+ * Various driver changes and rewrites, port to new kernels
+ *   Copyright (C) 2006-2007 Jiri Kosina
+ *
+ * Misc code cleanups and updates
+ *   Copyright (C) 2007 David Sterba
+ */
+
+#ifndef _IPWIRELESS_CS_TTY_H_
+#define _IPWIRELESS_CS_TTY_H_
+
+#include <linux/types.h>
+#include <linux/sched.h>
+
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+
+struct ipw_tty;
+struct ipw_network;
+struct ipw_hardware;
+
+int ipwireless_tty_init(void);
+void ipwireless_tty_release(void);
+
+struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hw,
+				      struct ipw_network *net);
+void ipwireless_tty_free(struct ipw_tty *tty);
+void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data,
+			     unsigned int length);
+int ipwireless_tty_is_modem(struct ipw_tty *tty);
+void ipwireless_tty_notify_control_line_change(struct ipw_tty *tty,
+					       unsigned int channel_idx,
+					       unsigned int control_lines,
+					       unsigned int changed_mask);
+
+#endif