[PATCH] drivers: add LCD support

Add support for auxiliary displays, the ks0108 LCD controller, the
cfag12864b LCD and adds a framebuffer device: cfag12864bfb.

- Add a "auxdisplay/" folder in "drivers/" for auxiliary display
  drivers.

- Add support for the ks0108 LCD Controller as a device driver.  (uses
  parport interface)

- Add support for the cfag12864b LCD as a device driver.  (uses ks0108
  LCD Controller driver)

- Add a framebuffer device called cfag12864bfb.  (uses cfag12864b LCD
  driver)

- Add the usual Documentation, includes, Makefiles, Kconfigs,
  MAINTAINERS, CREDITS...

- Miguel Ojeda will maintain all the stuff above.

[rdunlap@xenotime.net: workqueue fixups]
[akpm@osdl.org: kconfig fix]
Signed-off-by: Miguel Ojeda Sandonis <maxextreme@gmail.com>
Cc: Greg KH <greg@kroah.com>
Acked-by: Paulo Marques <pmarques@grupopie.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 109 insertions, 0 deletions

diff --git a/drivers/auxdisplay/Kconfig b/drivers/auxdisplay/Kconfig
new file mode 100644
index 000000000000..0300e7f54cc4
--- /dev/null
+++ b/drivers/auxdisplay/Kconfig
@@ -0,0 +1,109 @@
+#
+# For a description of the syntax of this configuration file,
+# see Documentation/kbuild/kconfig-language.txt.
+#
+# Auxiliary display drivers configuration.
+#
+
+menu "Auxiliary Display support"
+
+config KS0108
+        tristate "KS0108 LCD Controller"
+        depends on PARPORT_PC
+        default n
+        ---help---
+          If you have a LCD controlled by one or more KS0108
+          controllers, say Y. You will need also another more specific
+          driver for your LCD.
+
+          Depends on Parallel Port support. If you say Y at
+          parport, you will be able to compile this as a module (M)
+          and built-in as well (Y).
+
+          To compile this as a module, choose M here:
+          the module will be called ks0108.
+
+          If unsure, say N.
+
+config KS0108_PORT
+        hex "Parallel port where the LCD is connected"
+        depends on KS0108
+        default 0x378
+        ---help---
+          The address of the parallel port where the LCD is connected.
+
+          The first  standard parallel port address is 0x378.
+          The second standard parallel port address is 0x278.
+          The third  standard parallel port address is 0x3BC.
+
+          You can specify a different address if you need.
+
+          If you don't know what I'm talking about, load the parport module,
+          and execute "dmesg" or "cat /proc/ioports". You can see there how
+          many parallel ports are present and which address each one has.
+
+          Usually you only need to use 0x378.
+
+          If you compile this as a module, you can still override this
+          using the module parameters.
+
+config KS0108_DELAY
+        int "Delay between each control writing (microseconds)"
+        depends on KS0108
+        default "2"
+        ---help---
+          Amount of time the ks0108 should wait between each control write
+          to the parallel port.
+
+          If your driver seems to miss random writings, increment this.
+
+          If you don't know what I'm talking about, ignore it.
+
+          If you compile this as a module, you can still override this
+          value using the module parameters.
+
+config CFAG12864B
+        tristate "CFAG12864B LCD"
+        depends on X86
+        depends on FB
+        depends on KS0108
+        default n
+        ---help---
+          If you have a Crystalfontz 128x64 2-color LCD, cfag12864b Series,
+          say Y. You also need the ks0108 LCD Controller driver.
+
+          For help about how to wire your LCD to the parallel port,
+          check Documentation/auxdisplay/cfag12864b
+
+          Depends on the x86 arch and the framebuffer support.
+
+          The LCD framebuffer driver can be attached to a console.
+          It will work fine. However, you can't attach it to the fbdev driver
+          of the xorg server.
+
+          To compile this as a module, choose M here:
+          the modules will be called cfag12864b and cfag12864bfb.
+
+          If unsure, say N.
+
+config CFAG12864B_RATE
+       int "Refresh rate (hertz)"
+        depends on CFAG12864B
+        default "20"
+        ---help---
+          Refresh rate of the LCD.
+
+          As the LCD is not memory mapped, the driver has to make the work by
+          software. This means you should be careful setting this value higher.
+          If your CPUs are really slow or you feel the system is slowed down,
+          decrease the value.
+
+          Be careful modifying this value to a very high value:
+          You can freeze the computer, or the LCD maybe can't draw as fast as you
+          are requesting.
+
+          If you don't know what I'm talking about, ignore it.
+
+          If you compile this as a module, you can still override this
+          value using the module parameters.
+endmenu