config PANEL

tristate "Parallel port LCD/Keypad Panel support"

depends on PARPORT

select CHARLCD

---help---

Say Y here if you have an HD44780 or KS-0074 LCD connected to your

parallel port. This driver also features 4 and 6-key keypads. The LCD

is accessible through the /dev/lcd char device (10, 156), and the

keypad through /dev/keypad (10, 185). This code can either be

compiled as a module, or linked into the kernel and started at boot.

If you don't understand what all this is about, say N.

if PANEL

config PANEL_PARPORT

int "Default parallel port number (0=LPT1)"

range 0 255

default "0"

---help---

This is the index of the parallel port the panel is connected to. One

driver instance only supports one parallel port, so if your keypad

and LCD are connected to two separate ports, you have to start two

modules with different arguments. Numbering starts with '0' for LPT1,

and so on.

config PANEL_PROFILE

int "Default panel profile (0-5, 0=custom)"

range 0 5

default "5"

---help---

To ease configuration, the driver supports different configuration

profiles for past and recent wirings. These profiles can also be

used to define an approximative configuration, completed by a few

other options. Here are the profiles :

0 = custom (see further)

1 = 2x16 parallel LCD, old keypad

2 = 2x16 serial LCD (KS-0074), new keypad

3 = 2x16 parallel LCD (Hantronix), no keypad

4 = 2x16 parallel LCD (Nexcom NSA1045) with Nexcom's keypad

5 = 2x40 parallel LCD (old one), with old keypad

Custom configurations allow you to define how your display is

wired to the parallel port, and how it works. This is only intended

for experts.

config PANEL_KEYPAD

depends on PANEL_PROFILE="0"

int "Keypad type (0=none, 1=old 6 keys, 2=new 6 keys, 3=Nexcom 4 keys)"

range 0 3

default 0

---help---

This enables and configures a keypad connected to the parallel port.

The keys will be read from character device 10,185. Valid values are :

0 : do not enable this driver

1 : old 6 keys keypad

2 : new 6 keys keypad, as used on the server at www.ant-computing.com

3 : Nexcom NSA1045's 4 keys keypad

New profiles can be described in the driver source. The driver also

supports simultaneous keys pressed when the keypad supports them.

config PANEL_LCD

depends on PANEL_PROFILE="0"

int "LCD type (0=none, 1=custom, 2=old //, 3=ks0074, 4=hantronix, 5=Nexcom)"

range 0 5

default 0

---help---

This enables and configures an LCD connected to the parallel port.

The driver includes an interpreter for escape codes starting with

'\e[L' which are specific to the LCD, and a few ANSI codes. The

driver will be registered as character device 10,156, usually

under the name '/dev/lcd'. There are a total of 6 supported types :

0 : do not enable the driver

1 : custom configuration and wiring (see further)

2 : 2x16 & 2x40 parallel LCD (old wiring)

3 : 2x16 serial LCD (KS-0074 based)

4 : 2x16 parallel LCD (Hantronix wiring)

5 : 2x16 parallel LCD (Nexcom wiring)

When type '1' is specified, other options will appear to configure

more precise aspects (wiring, dimensions, protocol, ...). Please note

that those values changed from the 2.4 driver for better consistency.

config PANEL_LCD_HEIGHT

depends on PANEL_PROFILE="0" && PANEL_LCD="1"

int "Number of lines on the LCD (1-2)"

range 1 2

default 2

---help---

This is the number of visible character lines on the LCD in custom profile.

It can either be 1 or 2.

config PANEL_LCD_WIDTH

depends on PANEL_PROFILE="0" && PANEL_LCD="1"

int "Number of characters per line on the LCD (1-40)"

range 1 40

default 40

---help---

This is the number of characters per line on the LCD in custom profile.

Common values are 16,20,24,40.

config PANEL_LCD_BWIDTH

depends on PANEL_PROFILE="0" && PANEL_LCD="1"

int "Internal LCD line width (1-40, 40 by default)"

range 1 40

default 40

---help---

Most LCDs use a standard controller which supports hardware lines of 40

characters, although sometimes only 16, 20 or 24 of them are really wired

to the terminal. This results in some non-visible but addressable characters,

and is the case for most parallel LCDs. Other LCDs, and some serial ones,

however, use the same line width internally as what is visible. The KS0074

for example, uses 16 characters per line for 16 visible characters per line.

This option lets you configure the value used by your LCD in 'custom' profile.

If you don't know, put '40' here.

config PANEL_LCD_HWIDTH

depends on PANEL_PROFILE="0" && PANEL_LCD="1"

int "Hardware LCD line width (1-64, 64 by default)"

range 1 64

default 64

---help---

Most LCDs use a single address bit to differentiate line 0 and line 1. Since

some of them need to be able to address 40 chars with the lower bits, they

often use the immediately superior power of 2, which is 64, to address the

next line.

If you don't know what your LCD uses, in doubt let 16 here for a 2x16, and

64 here for a 2x40.

config PANEL_LCD_CHARSET

depends on PANEL_PROFILE="0" && PANEL_LCD="1"

int "LCD character set (0=normal, 1=KS0074)"

range 0 1

default 0

---help---

Some controllers such as the KS0074 use a somewhat strange character set

where many symbols are at unusual places. The driver knows how to map

'standard' ASCII characters to the character sets used by these controllers.

Valid values are :

0 : normal (untranslated) character set

1 : KS0074 character set

If you don't know, use the normal one (0).

config PANEL_LCD_PROTO

depends on PANEL_PROFILE="0" && PANEL_LCD="1"

int "LCD communication mode (0=parallel 8 bits, 1=serial)"

range 0 1

default 0

---help---

This driver now supports any serial or parallel LCD wired to a parallel

port. But before assigning signals, the driver needs to know if it will

be driving a serial LCD or a parallel one. Serial LCDs only use 2 wires

(SDA/SCL), while parallel ones use 2 or 3 wires for the control signals

(E, RS, sometimes RW), and 4 or 8 for the data. Use 0 here for a 8 bits

parallel LCD, and 1 for a serial LCD.

config PANEL_LCD_PIN_E

depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"

int "Parallel port pin number & polarity connected to the LCD E signal (-17...17) "

range -17 17

default 14

---help---

This describes the number of the parallel port pin to which the LCD 'E'

signal has been connected. It can be :

0 : no connection (eg: connected to ground)

1..17 : directly connected to any of these pins on the DB25 plug

-1..-17 : connected to the same pin through an inverter (eg: transistor).

Default for the 'E' pin in custom profile is '14' (AUTOFEED).

config PANEL_LCD_PIN_RS

depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"

int "Parallel port pin number & polarity connected to the LCD RS signal (-17...17) "

range -17 17

default 17

---help---

This describes the number of the parallel port pin to which the LCD 'RS'

signal has been connected. It can be :

0 : no connection (eg: connected to ground)

1..17 : directly connected to any of these pins on the DB25 plug

-1..-17 : connected to the same pin through an inverter (eg: transistor).

Default for the 'RS' pin in custom profile is '17' (SELECT IN).

config PANEL_LCD_PIN_RW

depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO="0"

int "Parallel port pin number & polarity connected to the LCD RW signal (-17...17) "

range -17 17

default 16

---help---

This describes the number of the parallel port pin to which the LCD 'RW'

signal has been connected. It can be :

0 : no connection (eg: connected to ground)

1..17 : directly connected to any of these pins on the DB25 plug

-1..-17 : connected to the same pin through an inverter (eg: transistor).

Default for the 'RW' pin in custom profile is '16' (INIT).

config PANEL_LCD_PIN_SCL

depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"

int "Parallel port pin number & polarity connected to the LCD SCL signal (-17...17) "

range -17 17

default 1

---help---

This describes the number of the parallel port pin to which the serial

LCD 'SCL' signal has been connected. It can be :

0 : no connection (eg: connected to ground)

1..17 : directly connected to any of these pins on the DB25 plug

-1..-17 : connected to the same pin through an inverter (eg: transistor).

Default for the 'SCL' pin in custom profile is '1' (STROBE).

config PANEL_LCD_PIN_SDA

depends on PANEL_PROFILE="0" && PANEL_LCD="1" && PANEL_LCD_PROTO!="0"

int "Parallel port pin number & polarity connected to the LCD SDA signal (-17...17) "

range -17 17

default 2

---help---

This describes the number of the parallel port pin to which the serial

LCD 'SDA' signal has been connected. It can be :

0 : no connection (eg: connected to ground)

1..17 : directly connected to any of these pins on the DB25 plug

-1..-17 : connected to the same pin through an inverter (eg: transistor).

Default for the 'SDA' pin in custom profile is '2' (D0).

config PANEL_LCD_PIN_BL

depends on PANEL_PROFILE="0" && PANEL_LCD="1"

int "Parallel port pin number & polarity connected to the LCD backlight signal (-17...17) "

range -17 17

default 0

---help---

This describes the number of the parallel port pin to which the LCD 'BL' signal

has been connected. It can be :

0 : no connection (eg: connected to ground)

1..17 : directly connected to any of these pins on the DB25 plug

-1..-17 : connected to the same pin through an inverter (eg: transistor).

Default for the 'BL' pin in custom profile is '0' (uncontrolled).

config PANEL_CHANGE_MESSAGE

bool "Change LCD initialization message ?"

default "n"

---help---

This allows you to replace the boot message indicating the kernel version

and the driver version with a custom message. This is useful on appliances

where a simple 'Starting system' message can be enough to stop a customer

from worrying.

If you say 'Y' here, you'll be able to choose a message yourself. Otherwise,

say 'N' and keep the default message with the version.

config PANEL_BOOT_MESSAGE

depends on PANEL_CHANGE_MESSAGE="y"

string "New initialization message"

default ""

---help---

This allows you to replace the boot message indicating the kernel version

and the driver version with a custom message. This is useful on appliances

where a simple 'Starting system' message can be enough to stop a customer

from worrying.

An empty message will only clear the display at driver init time. Any other

printf()-formatted message is valid with newline and escape codes.

endif # PANEL

obj-$(CONFIG_PANEL) += panel.o