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This adds a minimalistic braille screen reader support. This is meant to be used by blind people e.g. on boot failures or when / cannot be mounted etc and thus the userland screen readers can not work. [[email protected]: fix exports] Signed-off-by: Samuel Thibault <[email protected]> Cc: Jiri Kosina <[email protected]> Cc: Dmitry Torokhov <[email protected]> Acked-by: Alan Cox <[email protected]> Cc: Randy Dunlap <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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Linux Braille Console | ||
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To get early boot messages on a braille device (before userspace screen | ||
readers can start), you first need to compile the support for the usual serial | ||
console (see serial-console.txt), and for braille device (in Device Drivers - | ||
Accessibility). | ||
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Then you need to specify a console=brl, option on the kernel command line, the | ||
format is: | ||
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console=brl,serial_options... | ||
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where serial_options... are the same as described in serial-console.txt | ||
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So for instance you can use console=brl,ttyS0 if the braille device is connected | ||
to the first serial port, and console=brl,ttyS0,115200 to override the baud rate | ||
to 115200, etc. | ||
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By default, the braille device will just show the last kernel message (console | ||
mode). To review previous messages, press the Insert key to switch to the VT | ||
review mode. In review mode, the arrow keys permit to browse in the VT content, | ||
page up/down keys go at the top/bottom of the screen, and the home key goes back | ||
to the cursor, hence providing very basic screen reviewing facility. | ||
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Sound feedback can be obtained by adding the braille_console.sound=1 kernel | ||
parameter. | ||
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For simplicity, only one braille console can be enabled, other uses of | ||
console=brl,... will be discarded. Also note that it does not interfere with | ||
the console selection mecanism described in serial-console.txt | ||
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For now, only the VisioBraille device is supported. | ||
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Samuel Thibault <[email protected]> |
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menuconfig ACCESSIBILITY | ||
bool "Accessibility support" | ||
---help--- | ||
Enable a submenu where accessibility items may be enabled. | ||
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If unsure, say N. | ||
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if ACCESSIBILITY | ||
config A11Y_BRAILLE_CONSOLE | ||
bool "Console on braille device" | ||
depends on VT | ||
depends on SERIAL_CORE_CONSOLE | ||
---help--- | ||
Enables console output on a braille device connected to a 8250 | ||
serial port. For now only the VisioBraille device is supported. | ||
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To actually enable it, you need to pass option | ||
console=brl,ttyS0 | ||
to the kernel. Options are the same as for serial console. | ||
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If unsure, say N. | ||
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endif # ACCESSIBILITY |
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obj-y += braille/ |
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obj-$(CONFIG_A11Y_BRAILLE_CONSOLE) += braille_console.o |
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