gpio: add bt8xxgpio driver

This adds the bt8xxgpio driver.  The purpose of the bt8xxgpio driver is to
export all of the 24 GPIO pins available on Brooktree 8xx chips to the
kernel GPIO infrastructure.

This makes it possible to use a physically modified BT8xx card as
cheap digital GPIO card.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: David Brownell <david-b@pacbell.net>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 6ec0e35b98e..de202dbe530 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -83,6 +83,24 @@ config GPIO_PCF857X
           This driver provides an in-kernel interface to those GPIOs using
           platform-neutral GPIO calls.
 
+comment "PCI GPIO expanders:"
+
+config GPIO_BT8XX
+        tristate "BT8XX GPIO abuser"
+        depends on PCI && VIDEO_BT848=n
+        help
+          The BT8xx frame grabber chip has 24 GPIO pins than can be abused
+          as a cheap PCI GPIO card.
+
+          This chip can be found on Miro, Hauppauge and STB TV-cards.
+
+          The card needs to be physically altered for using it as a
+          GPIO card. For more information on how to build a GPIO card
+          from a BT8xx TV card, see the documentation file at
+          Documentation/bt8xxgpio.txt
+
+          If unsure, say N.
+
 comment "SPI GPIO expanders:"
 
 config GPIO_MAX7301