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Separate out bus-scanning and device-probing logic.

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This commit is contained in:
Michael Brown
2005-04-14 13:33:03 +00:00
parent 4c0d5a0b71
commit ce8dea0dff
3 changed files with 62 additions and 12 deletions
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35
src/core/dev.c
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@@ -2,6 +2,20 @@
#include "stddef.h"
#include "dev.h"
/*
* Each driver specifies a name, the bus-scanning function
* (find_bus_boot_device) that it wants to use, a driver information
* structure (bus_driver) containing e.g. device IDs to be passed to
* find_bus_boot_device, and a probe function (probe) to be called
* whenever a suitable device is found.
*
* The generic device-probing code knows nothing about particular bus
* types; it simply passes the driver information structure
* (bus_driver) to the bus-scanning function (find_bus_boot_device),
* then passes the result of that function (if not NULL) to the probe
* function (probe).
*/
/* Defined by linker */
extern struct boot_driver boot_drivers[];
extern struct boot_driver boot_drivers_end[];
@@ -19,19 +33,30 @@ void print_drivers ( void ) {
}
/* Get the next available boot device */
int probe ( struct dev *dev ) {
int find_boot_device ( struct dev *dev ) {
for ( ; boot_driver < boot_drivers_end ; boot_driver++ ) {
dev->name = "unknown";
if ( boot_driver->probe ( dev ) )
dev->driver = boot_driver;
dev->name = boot_driver->name;
DBG ( "Probing driver %s...\n", dev->name );
if ( boot_driver->find_bus_boot_device ( dev,
boot_driver->bus_driver ) ) {
DBG ( "Found device %s (ID %hhx:%hx:%hx)\n",
dev->name, dev->devid->bus_type,
dev->devid->vendor_id, dev->devid->device_id );
return 1;
}
}
/* No more boot devices found */
boot_driver = boot_drivers;
return 0;
}
/* Probe the boot device */
int probe ( struct dev *dev ) {
return dev->driver->probe ( dev, dev->bus );
}
/* Disable a device */
void disable ( struct dev *dev ) {
if ( dev->dev_op ) {