linux-kernel - [PATCH 10/13] comedi: amplc_dio200_pci: Conditionally remove devices that use port I/O

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Date:   Wed, 13 Sep 2023 12:20:29 +0100
From:   Ian Abbott <abbotti@....co.uk>
To:     linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Ian Abbott <abbotti@....co.uk>
Subject: [PATCH 10/13] comedi: amplc_dio200_pci: Conditionally remove devices that use port I/O

In a future patch, the port I/O functions (`inb()`, `outb()`, and
friends will only be declared in the `HAS_IOPORT` configuration option
is enabled.

The amplc_dio200_pci module supports various Amplicon PCI and PCI
Express devices.  Some of the supported devices (the PCI ones) use port
I/O, and some of them (the PCIe ones) only use memory-mapped I/O.

Conditionally compile in support for the devices that need port I/O if
and only if the `CONFIG_HAS_PORTIO` macro is defined.

Add a run-time check in `dio200_pci_auto_attach()` to return an error if
the device actually requires port I/O (based on the PCI BAR resource
flags) but the `HAS_IOPORT` configuration option is not enabled.

Cc: Arnd Bergmann <arnd@...nel.org>
Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/comedi/drivers/amplc_dio200_pci.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/amplc_dio200_pci.c b/drivers/comedi/drivers/amplc_dio200_pci.c
index 527994d82a1f..cb5b328a28e3 100644
--- a/drivers/comedi/drivers/amplc_dio200_pci.c
+++ b/drivers/comedi/drivers/amplc_dio200_pci.c
@@ -223,14 +223,17 @@
  */
 
 enum dio200_pci_model {
+#ifdef CONFIG_HAS_IOPORT
 	pci215_model,
 	pci272_model,
+#endif /* CONFIG_HAS_IOPORT */
 	pcie215_model,
 	pcie236_model,
 	pcie296_model
 };
 
 static const struct dio200_board dio200_pci_boards[] = {
+#ifdef CONFIG_HAS_IOPORT
 	[pci215_model] = {
 		.name		= "pci215",
 		.mainbar	= 2,
@@ -252,6 +255,7 @@ static const struct dio200_board dio200_pci_boards[] = {
 		.sdinfo		= { 0x00, 0x08, 0x10, 0x3f },
 		.has_int_sce	= true,
 	},
+#endif /* CONFIG_HAS_IOPORT */
 	[pcie215_model] = {
 		.name		= "pcie215",
 		.mainbar	= 1,
@@ -364,8 +368,12 @@ static int dio200_pci_auto_attach(struct comedi_device *dev,
 				"error! cannot remap registers\n");
 			return -ENOMEM;
 		}
-	} else {
+	} else if (IS_ENABLED(CONFIG_HAS_IOPORT)) {
 		dev->iobase = pci_resource_start(pci_dev, bar);
+	} else {
+		dev_err(dev->class_dev,
+			"error! need I/O port support\n");
+		return -ENXIO;
 	}
 
 	if (board->is_pcie) {
@@ -385,8 +393,10 @@ static struct comedi_driver dio200_pci_comedi_driver = {
 };
 
 static const struct pci_device_id dio200_pci_table[] = {
+#ifdef CONFIG_HAS_IOPORT
 	{ PCI_VDEVICE(AMPLICON, 0x000b), pci215_model },
 	{ PCI_VDEVICE(AMPLICON, 0x000a), pci272_model },
+#endif /* CONFIG_HAS_IOPORT */
 	{ PCI_VDEVICE(AMPLICON, 0x0011), pcie236_model },
 	{ PCI_VDEVICE(AMPLICON, 0x0012), pcie215_model },
 	{ PCI_VDEVICE(AMPLICON, 0x0014), pcie296_model },
-- 
2.40.1