diff options
Diffstat (limited to 'Documentation/vme_api.txt')
| -rw-r--r-- | Documentation/vme_api.txt | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Documentation/vme_api.txt b/Documentation/vme_api.txt index ca5b82797f6c..90006550f485 100644 --- a/Documentation/vme_api.txt +++ b/Documentation/vme_api.txt @@ -8,13 +8,14 @@ As with other subsystems within the Linux kernel, VME device drivers register with the VME subsystem, typically called from the devices init routine. This is achieved via a call to the following function: - int vme_register_driver (struct vme_driver *driver); + int vme_register_driver (struct vme_driver *driver, unsigned int ndevs); If driver registration is successful this function returns zero, if an error occurred a negative error code will be returned. A pointer to a structure of type 'vme_driver' must be provided to the -registration function. The structure is as follows: +registration function. Along with ndevs, which is the number of devices your +driver is able to support. The structure is as follows: struct vme_driver { struct list_head node; @@ -32,8 +33,8 @@ At the minimum, the '.name', '.match' and '.probe' elements of this structure should be correctly set. The '.name' element is a pointer to a string holding the device driver's name. -The '.match' function allows controlling the number of devices that need to -be registered. The match function should return 1 if a device should be +The '.match' function allows control over which VME devices should be registered +with the driver. The match function should return 1 if a device should be probed and 0 otherwise. This example match function (from vme_user.c) limits the number of devices probed to one: @@ -385,13 +386,13 @@ location monitor location. Each location monitor can monitor a number of adjacent locations: int vme_lm_attach(struct vme_resource *res, int num, - void (*callback)(int)); + void (*callback)(void *)); int vme_lm_detach(struct vme_resource *res, int num); The callback function is declared as follows. - void callback(int num); + void callback(void *data); Slot Detection |