[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>
diff --git a/Documentation/auxdisplay/cfag12864b b/Documentation/auxdisplay/cfag12864b
new file mode 100644
index 0000000..3572b98
--- /dev/null
+++ b/Documentation/auxdisplay/cfag12864b
@@ -0,0 +1,105 @@
+ ===================================
+ cfag12864b LCD Driver Documentation
+ ===================================
+
+License: GPLv2
+Author & Maintainer: Miguel Ojeda Sandonis <maxextreme@gmail.com>
+Date: 2006-10-27
+
+
+
+--------
+0. INDEX
+--------
+
+ 1. DRIVER INFORMATION
+ 2. DEVICE INFORMATION
+ 3. WIRING
+ 4. USERSPACE PROGRAMMING
+
+
+---------------------
+1. DRIVER INFORMATION
+---------------------
+
+This driver support one cfag12864b display at time.
+
+
+---------------------
+2. DEVICE INFORMATION
+---------------------
+
+Manufacturer: Crystalfontz
+Device Name: Crystalfontz 12864b LCD Series
+Device Code: cfag12864b
+Webpage: http://www.crystalfontz.com
+Device Webpage: http://www.crystalfontz.com/products/12864b/
+Type: LCD (Liquid Crystal Display)
+Width: 128
+Height: 64
+Colors: 2 (B/N)
+Controller: ks0108
+Controllers: 2
+Pages: 8 each controller
+Addresses: 64 each page
+Data size: 1 byte each address
+Memory size: 2 * 8 * 64 * 1 = 1024 bytes = 1 Kbyte
+
+
+---------
+3. WIRING
+---------
+
+The cfag12864b LCD Series don't have official wiring.
+
+The common wiring is done to the parallel port as shown:
+
+Parallel Port cfag12864b
+
+ Name Pin# Pin# Name
+
+Strobe ( 1)------------------------------(17) Enable
+Data 0 ( 2)------------------------------( 4) Data 0
+Data 1 ( 3)------------------------------( 5) Data 1
+Data 2 ( 4)------------------------------( 6) Data 2
+Data 3 ( 5)------------------------------( 7) Data 3
+Data 4 ( 6)------------------------------( 8) Data 4
+Data 5 ( 7)------------------------------( 9) Data 5
+Data 6 ( 8)------------------------------(10) Data 6
+Data 7 ( 9)------------------------------(11) Data 7
+ (10) [+5v]---( 1) Vdd
+ (11) [GND]---( 2) Ground
+ (12) [+5v]---(14) Reset
+ (13) [GND]---(15) Read / Write
+ Line (14)------------------------------(13) Controller Select 1
+ (15)
+ Init (16)------------------------------(12) Controller Select 2
+Select (17)------------------------------(16) Data / Instruction
+Ground (18)---[GND] [+5v]---(19) LED +
+Ground (19)---[GND]
+Ground (20)---[GND] E A Values:
+Ground (21)---[GND] [GND]---[P1]---(18) Vee · R = Resistor = 22 ohm
+Ground (22)---[GND] | · P1 = Preset = 10 Kohm
+Ground (23)---[GND] ---- S ------( 3) V0 · P2 = Preset = 1 Kohm
+Ground (24)---[GND] | |
+Ground (25)---[GND] [GND]---[P2]---[R]---(20) LED -
+
+
+------------------------
+4. USERSPACE PROGRAMMING
+------------------------
+
+The cfag12864bfb describes a framebuffer device (/dev/fbX).
+
+It has a size of 1024 bytes = 1 Kbyte.
+Each bit represents one pixel. If the bit is high, the pixel will
+turn on. If the pixel is low, the pixel will turn off.
+
+You can use the framebuffer as a file: fopen, fwrite, fclose...
+Although the LCD won't get updated until the next refresh time arrives.
+
+Also, you can mmap the framebuffer: open & mmap, munmap & close...
+which is the best option for most uses.
+
+Check Documentation/auxdisplay/cfag12864b-example.c
+for a real working userspace complete program with usage examples.