[v3,12/13] comedi: amplc_dio200_common: Conditionally remove I/O port support
Commit Message
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_common module is used by the amplc_dio200 module (for
ISA cards) and the amplc_dio200_pci module (for PCI and PCI Express
cards). It supports both port I/O and memory-mapped I/O.
Port I/O and memory-mapped I/O is confined to the `dio200___read8()`,
`dio200___read32()`, `dio200___write8()` and `dio200___write32()`
functions. Conditionally compile two versions of those functions. If
the `CONFIG_HAS_IOPORT` macro is defined, call either the port I/O or
memory mapped I/O functions depending on the `mmio` member of the
`struct comedi_device`. If the `CONFIG_HAS_IOPORT` macro is undefined
only call the memory-mapped I/O functions.
Add a run-time check to `amplc_dio200_common_attach()` to return an
error if the 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>
---
v2: Correct `CONFIG_HAS_PORTIO` to `CONFIG_HAS_IOPORT` in commit
description.
v3: N/A.
---
drivers/comedi/drivers/amplc_dio200_common.c | 36 ++++++++++++++++++++
1 file changed, 36 insertions(+)
@@ -86,6 +86,8 @@ struct dio200_subdev_intr {
unsigned int active:1;
};
+#ifdef CONFIG_HAS_IOPORT
+
static unsigned char dio200___read8(struct comedi_device *dev,
unsigned int offset)
{
@@ -120,6 +122,34 @@ static void dio200___write32(struct comedi_device *dev,
outl(val, dev->iobase + offset);
}
+#else /* CONFIG_HAS_IOPORT */
+
+static unsigned char dio200___read8(struct comedi_device *dev,
+ unsigned int offset)
+{
+ return readb(dev->mmio + offset);
+}
+
+static void dio200___write8(struct comedi_device *dev,
+ unsigned int offset, unsigned char val)
+{
+ writeb(val, dev->mmio + offset);
+}
+
+static unsigned int dio200___read32(struct comedi_device *dev,
+ unsigned int offset)
+{
+ return readl(dev->mmio + offset);
+}
+
+static void dio200___write32(struct comedi_device *dev,
+ unsigned int offset, unsigned int val)
+{
+ writel(val, dev->mmio + offset);
+}
+
+#endif /* CONFIG_HAS_IOPORT */
+
static unsigned char dio200_read8(struct comedi_device *dev,
unsigned int offset)
{
@@ -803,6 +833,12 @@ int amplc_dio200_common_attach(struct comedi_device *dev, unsigned int irq,
unsigned int n;
int ret;
+ if (!IS_ENABLED(CONFIG_HAS_IOPORT) && !dev->mmio) {
+ dev_err(dev->class_dev,
+ "error! need I/O port support\n");
+ return -ENXIO;
+ }
+
ret = comedi_alloc_subdevices(dev, board->n_subdevs);
if (ret)
return ret;