dummy_cs(4)
NAME
dummy_cs - PCMCIA dummy device driver
SYNOPSIS
insmod dummy_cs.o [pc_debug=n] [free_ports=n] [irq_list=i,j,...]
DESCRIPTION
The dummy_cs module has two purposes. It is intended as a
demonstration of how to write the PCMCIA interface code
for a client driver, and the source code is heavily com
mented. It is also written to function as a sort of
generic ``point enabler'': when bound to any PCMCIA IO
card, it will read the card's Configuration Information
Structure, and configure the card appropriately. The con
figuration includes setting up IO and memory windows, con
figuring the card for interrupts, and initializing the
card's PCMCIA configuration registers.
It turns out that many cards report incomplete or inaccu
rate configuration information, due to vendor carelessness
and the complexity of the data format. A vendor driver
can generally take for granted many configuration details,
so there is not much incentive for vendors to ensure that
the on-card information is complete. Thus, the dummy_cs
module is limited by its generality: since it makes no
assumptions about card types, it is forced to rely on the
card information, for better or worse.
PARAMETERS
- pc_debug=n
- Selects the PCMCIA debugging level. This parameter
is only available if the module is compiled with
debugging enabled. A non-zero value enables debug
ging. - free_ports=n
- A flag indicating if the IO ports allocated for the
card should be freed from the kernel resource maps.
This is useful if the dummy driver is being used to
configure a card in preparation for loading a spe
cific PCMCIA-unaware driver. The default is 0
(false). - irq_list=i,j,...
- Specifies the set of interrupts that may be allo
cated by this driver.
AUTHOR
David Hinds - dahinds@users.sourceforge.net