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authorIan Abbott <abbotti@mev.co.uk>2023-09-13 20:07:07 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-10-05 14:34:04 +0300
commita7b9ffd8c208d5911ba44a31e65d7c40400bbebd (patch)
tree7e2a700f650216d895c5d551ac449c4f6ce34016 /drivers/comedi
parent7187a0939a1773e6a2663a02a6c456047a5e6289 (diff)
downloadlinux-a7b9ffd8c208d5911ba44a31e65d7c40400bbebd.tar.xz
comedi: ni_labpc_common: Conditionally remove I/O port support
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 ni_labpc_common module is used by the ni_labpc module (for ISA cards), the ni_labpc_cs module (for PCMCIA cards), and the ni_labpc_pci module (for PCI cards). The ISA and PCMCIA cards use port I/O and the PCI cards use memory-mapped I/O. Conditionally compile the parts of the module that use the port I/O functions so they are compiled if and only if the `CONFIG_HAS_IOPORT` macro is defined, so that the module can be built if the port I/O functions have not been declared. Add a run-time check in the `labpc_common_attach()` to return an error if the comedi device wants to use port I/O when the `CONFIG_HAS_IOPORT` macro is undefined. The changes allow the module to be built even if the port I/O functions have not been declared. Cc: Arnd Bergmann <arnd@kernel.org> Cc: Niklas Schnelle <schnelle@linux.ibm.com> Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Link: https://lore.kernel.org/r/20230913170712.111719-9-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/comedi')
-rw-r--r--drivers/comedi/drivers/ni_labpc_common.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/ni_labpc_common.c b/drivers/comedi/drivers/ni_labpc_common.c
index 5d5c1d0e9cb6..7e0ce0ce0adf 100644
--- a/drivers/comedi/drivers/ni_labpc_common.c
+++ b/drivers/comedi/drivers/ni_labpc_common.c
@@ -78,6 +78,9 @@ static const struct comedi_lrange range_labpc_ao = {
* functions that do inb/outb and readb/writeb so we can use
* function pointers to decide which to use
*/
+
+#ifdef CONFIG_HAS_IOPORT
+
static unsigned int labpc_inb(struct comedi_device *dev, unsigned long reg)
{
return inb(dev->iobase + reg);
@@ -89,6 +92,8 @@ static void labpc_outb(struct comedi_device *dev,
outb(byte, dev->iobase + reg);
}
+#endif /* CONFIG_HAS_IOPORT */
+
static unsigned int labpc_readb(struct comedi_device *dev, unsigned long reg)
{
return readb(dev->mmio + reg);
@@ -1200,8 +1205,12 @@ int labpc_common_attach(struct comedi_device *dev,
devpriv->read_byte = labpc_readb;
devpriv->write_byte = labpc_writeb;
} else {
+#ifdef CONFIG_HAS_IOPORT
devpriv->read_byte = labpc_inb;
devpriv->write_byte = labpc_outb;
+#else
+ return -ENXIO;
+#endif
}
/* initialize board's command registers */