Basic braille screen reader support
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. [akpm@linux-foundation.org: fix exports] Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Cc: Jiri Kosina <jikos@jikos.cz> Cc: Dmitry Torokhov <dtor@mail.ru> Acked-by: Alan Cox <alan@redhat.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Samuel Thibault
Linus Torvalds
Родитель
730f412c08
Коммит
f7511d5f66
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@ -0,0 +1,34 @@
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Linux Braille Console
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To get early boot messages on a braille device (before userspace screen
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readers can start), you first need to compile the support for the usual serial
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console (see serial-console.txt), and for braille device (in Device Drivers -
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Accessibility).
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Then you need to specify a console=brl, option on the kernel command line, the
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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
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to the first serial port, and console=brl,ttyS0,115200 to override the baud rate
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to 115200, etc.
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By default, the braille device will just show the last kernel message (console
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mode). To review previous messages, press the Insert key to switch to the VT
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review mode. In review mode, the arrow keys permit to browse in the VT content,
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page up/down keys go at the top/bottom of the screen, and the home key goes back
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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
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parameter.
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For simplicity, only one braille console can be enabled, other uses of
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console=brl,... will be discarded. Also note that it does not interfere with
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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 <samuel.thibault@ens-lyon.org>
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@ -496,6 +496,11 @@ and is between 256 and 4096 characters. It is defined in the file
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switching to the matching ttyS device later. The
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options are the same as for ttyS, above.
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If the device connected to the port is not a TTY but a braille
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device, prepend "brl," before the device type, for instance
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console=brl,ttyS0
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For now, only VisioBraille is supported.
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earlycon= [KNL] Output early console device and options.
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uart[8250],io,<addr>[,options]
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uart[8250],mmio,<addr>[,options]
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@ -133,9 +133,6 @@ EXPORT_SYMBOL(adb_try_handler_change);
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EXPORT_SYMBOL(cuda_request);
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EXPORT_SYMBOL(cuda_poll);
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#endif /* CONFIG_ADB_CUDA */
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#ifdef CONFIG_VT
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EXPORT_SYMBOL(kd_mksound);
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#endif
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EXPORT_SYMBOL(to_tm);
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#ifdef CONFIG_PPC32
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@ -183,9 +183,6 @@ EXPORT_SYMBOL(cuda_poll);
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#if defined(CONFIG_BOOTX_TEXT)
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EXPORT_SYMBOL(btext_update_display);
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#endif
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#ifdef CONFIG_VT
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EXPORT_SYMBOL(kd_mksound);
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#endif
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EXPORT_SYMBOL(to_tm);
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EXPORT_SYMBOL(pm_power_off);
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@ -84,6 +84,8 @@ source "drivers/memstick/Kconfig"
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source "drivers/leds/Kconfig"
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source "drivers/accessibility/Kconfig"
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source "drivers/infiniband/Kconfig"
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source "drivers/edac/Kconfig"
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@ -70,6 +70,7 @@ obj-$(CONFIG_WATCHDOG) += watchdog/
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obj-$(CONFIG_PHONE) += telephony/
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obj-$(CONFIG_MD) += md/
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obj-$(CONFIG_BT) += bluetooth/
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obj-$(CONFIG_ACCESSIBILITY) += accessibility/
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obj-$(CONFIG_ISDN) += isdn/
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obj-$(CONFIG_EDAC) += edac/
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obj-$(CONFIG_MCA) += mca/
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@ -0,0 +1,23 @@
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menuconfig ACCESSIBILITY
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bool "Accessibility support"
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---help---
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Enable a submenu where accessibility items may be enabled.
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If unsure, say N.
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if ACCESSIBILITY
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config A11Y_BRAILLE_CONSOLE
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bool "Console on braille device"
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depends on VT
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depends on SERIAL_CORE_CONSOLE
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---help---
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Enables console output on a braille device connected to a 8250
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serial port. For now only the VisioBraille device is supported.
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To actually enable it, you need to pass option
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console=brl,ttyS0
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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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@ -0,0 +1 @@
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obj-y += braille/
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@ -0,0 +1 @@
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obj-$(CONFIG_A11Y_BRAILLE_CONSOLE) += braille_console.o
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@ -0,0 +1,397 @@
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/*
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* Minimalistic braille device kernel support.
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*
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* By default, shows console messages on the braille device.
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* Pressing Insert switches to VC browsing.
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*
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* Copyright (C) Samuel Thibault <samuel.thibault@ens-lyon.org>
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*
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* This program is free software ; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation ; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY ; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the program ; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/autoconf.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/console.h>
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#include <linux/notifier.h>
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#include <linux/selection.h>
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#include <linux/vt_kern.h>
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#include <linux/consolemap.h>
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#include <linux/keyboard.h>
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#include <linux/kbd_kern.h>
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#include <linux/input.h>
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MODULE_AUTHOR("samuel.thibault@ens-lyon.org");
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MODULE_DESCRIPTION("braille device");
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MODULE_LICENSE("GPL");
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/*
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* Braille device support part.
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*/
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/* Emit various sounds */
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static int sound;
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module_param(sound, bool, 0);
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MODULE_PARM_DESC(sound, "emit sounds");
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static void beep(unsigned int freq)
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{
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if (sound)
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kd_mksound(freq, HZ/10);
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}
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/* mini console */
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#define WIDTH 40
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#define BRAILLE_KEY KEY_INSERT
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static u16 console_buf[WIDTH];
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static int console_cursor;
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/* mini view of VC */
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static int vc_x, vc_y, lastvc_x, lastvc_y;
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/* show console ? (or show VC) */
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static int console_show = 1;
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/* pending newline ? */
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static int console_newline = 1;
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static int lastVC = -1;
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static struct console *braille_co;
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/* Very VisioBraille-specific */
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static void braille_write(u16 *buf)
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{
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static u16 lastwrite[WIDTH];
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unsigned char data[1 + 1 + 2*WIDTH + 2 + 1], csum = 0, *c;
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u16 out;
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int i;
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if (!braille_co)
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return;
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if (!memcmp(lastwrite, buf, WIDTH * sizeof(*buf)))
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return;
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memcpy(lastwrite, buf, WIDTH * sizeof(*buf));
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#define SOH 1
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#define STX 2
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#define ETX 2
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#define EOT 4
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#define ENQ 5
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data[0] = STX;
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data[1] = '>';
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csum ^= '>';
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c = &data[2];
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for (i = 0; i < WIDTH; i++) {
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out = buf[i];
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if (out >= 0x100)
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out = '?';
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else if (out == 0x00)
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out = ' ';
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csum ^= out;
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if (out <= 0x05) {
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*c++ = SOH;
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out |= 0x40;
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}
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*c++ = out;
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}
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if (csum <= 0x05) {
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*c++ = SOH;
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csum |= 0x40;
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}
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*c++ = csum;
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*c++ = ETX;
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braille_co->write(braille_co, data, c - data);
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}
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/* Follow the VC cursor*/
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static void vc_follow_cursor(struct vc_data *vc)
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{
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vc_x = vc->vc_x - (vc->vc_x % WIDTH);
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vc_y = vc->vc_y;
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lastvc_x = vc->vc_x;
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lastvc_y = vc->vc_y;
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}
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/* Maybe the VC cursor moved, if so follow it */
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static void vc_maybe_cursor_moved(struct vc_data *vc)
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{
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if (vc->vc_x != lastvc_x || vc->vc_y != lastvc_y)
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vc_follow_cursor(vc);
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}
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/* Show portion of VC at vc_x, vc_y */
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static void vc_refresh(struct vc_data *vc)
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{
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u16 buf[WIDTH];
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int i;
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for (i = 0; i < WIDTH; i++) {
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u16 glyph = screen_glyph(vc,
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2 * (vc_x + i) + vc_y * vc->vc_size_row);
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buf[i] = inverse_translate(vc, glyph, 1);
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}
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braille_write(buf);
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}
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/*
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* Link to keyboard
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*/
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static int keyboard_notifier_call(struct notifier_block *blk,
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unsigned long code, void *_param)
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{
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struct keyboard_notifier_param *param = _param;
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struct vc_data *vc = param->vc;
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int ret = NOTIFY_OK;
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if (!param->down)
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return ret;
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switch (code) {
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case KBD_KEYCODE:
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if (console_show) {
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if (param->value == BRAILLE_KEY) {
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console_show = 0;
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beep(880);
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vc_maybe_cursor_moved(vc);
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vc_refresh(vc);
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ret = NOTIFY_STOP;
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}
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} else {
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ret = NOTIFY_STOP;
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switch (param->value) {
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case KEY_INSERT:
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beep(440);
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console_show = 1;
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lastVC = -1;
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braille_write(console_buf);
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break;
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case KEY_LEFT:
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if (vc_x > 0) {
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vc_x -= WIDTH;
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if (vc_x < 0)
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vc_x = 0;
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} else if (vc_y >= 1) {
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beep(880);
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vc_y--;
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vc_x = vc->vc_cols-WIDTH;
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} else
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beep(220);
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break;
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case KEY_RIGHT:
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if (vc_x + WIDTH < vc->vc_cols) {
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vc_x += WIDTH;
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} else if (vc_y + 1 < vc->vc_rows) {
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beep(880);
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vc_y++;
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vc_x = 0;
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} else
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beep(220);
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break;
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case KEY_DOWN:
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if (vc_y + 1 < vc->vc_rows)
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vc_y++;
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else
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beep(220);
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break;
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case KEY_UP:
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if (vc_y >= 1)
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vc_y--;
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else
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beep(220);
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break;
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case KEY_HOME:
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vc_follow_cursor(vc);
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break;
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case KEY_PAGEUP:
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vc_x = 0;
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vc_y = 0;
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break;
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case KEY_PAGEDOWN:
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vc_x = 0;
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vc_y = vc->vc_rows-1;
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break;
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default:
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ret = NOTIFY_OK;
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break;
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}
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if (ret == NOTIFY_STOP)
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vc_refresh(vc);
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}
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break;
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case KBD_POST_KEYSYM:
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{
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unsigned char type = KTYP(param->value) - 0xf0;
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if (type == KT_SPEC) {
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unsigned char val = KVAL(param->value);
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int on_off = -1;
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switch (val) {
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case KVAL(K_CAPS):
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on_off = vc_kbd_led(kbd_table + fg_console,
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VC_CAPSLOCK);
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break;
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case KVAL(K_NUM):
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on_off = vc_kbd_led(kbd_table + fg_console,
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VC_NUMLOCK);
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break;
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case KVAL(K_HOLD):
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on_off = vc_kbd_led(kbd_table + fg_console,
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VC_SCROLLOCK);
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break;
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}
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if (on_off == 1)
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beep(880);
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else if (on_off == 0)
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beep(440);
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}
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}
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case KBD_UNBOUND_KEYCODE:
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case KBD_UNICODE:
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case KBD_KEYSYM:
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/* Unused */
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break;
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}
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return ret;
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}
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static struct notifier_block keyboard_notifier_block = {
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.notifier_call = keyboard_notifier_call,
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};
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static int vt_notifier_call(struct notifier_block *blk,
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unsigned long code, void *_param)
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{
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struct vt_notifier_param *param = _param;
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struct vc_data *vc = param->vc;
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switch (code) {
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case VT_ALLOCATE:
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break;
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case VT_DEALLOCATE:
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break;
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case VT_WRITE:
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{
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unsigned char c = param->c;
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if (vc->vc_num != fg_console)
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break;
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switch (c) {
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case '\b':
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case 127:
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if (console_cursor > 0) {
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console_cursor--;
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console_buf[console_cursor] = ' ';
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}
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break;
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case '\n':
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case '\v':
|
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case '\f':
|
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case '\r':
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console_newline = 1;
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break;
|
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case '\t':
|
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c = ' ';
|
||||
/* Fallthrough */
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default:
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if (c < 32)
|
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/* Ignore other control sequences */
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break;
|
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if (console_newline) {
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memset(console_buf, 0, sizeof(console_buf));
|
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console_cursor = 0;
|
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console_newline = 0;
|
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}
|
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if (console_cursor == WIDTH)
|
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memmove(console_buf, &console_buf[1],
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(WIDTH-1) * sizeof(*console_buf));
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else
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console_cursor++;
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console_buf[console_cursor-1] = c;
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break;
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}
|
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if (console_show)
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braille_write(console_buf);
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else {
|
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vc_maybe_cursor_moved(vc);
|
||||
vc_refresh(vc);
|
||||
}
|
||||
break;
|
||||
}
|
||||
case VT_UPDATE:
|
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/* Maybe a VT switch, flush */
|
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if (console_show) {
|
||||
if (vc->vc_num != lastVC) {
|
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lastVC = vc->vc_num;
|
||||
memset(console_buf, 0, sizeof(console_buf));
|
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console_cursor = 0;
|
||||
braille_write(console_buf);
|
||||
}
|
||||
} else {
|
||||
vc_maybe_cursor_moved(vc);
|
||||
vc_refresh(vc);
|
||||
}
|
||||
break;
|
||||
}
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
||||
static struct notifier_block vt_notifier_block = {
|
||||
.notifier_call = vt_notifier_call,
|
||||
};
|
||||
|
||||
/*
|
||||
* Called from printk.c when console=brl is given
|
||||
*/
|
||||
|
||||
int braille_register_console(struct console *console, int index,
|
||||
char *console_options, char *braille_options)
|
||||
{
|
||||
int ret;
|
||||
if (!console_options)
|
||||
/* Only support VisioBraille for now */
|
||||
console_options = "57600o8";
|
||||
if (braille_co)
|
||||
return -ENODEV;
|
||||
if (console->setup) {
|
||||
ret = console->setup(console, console_options);
|
||||
if (ret != 0)
|
||||
return ret;
|
||||
}
|
||||
console->flags |= CON_ENABLED;
|
||||
console->index = index;
|
||||
braille_co = console;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int braille_unregister_console(struct console *console)
|
||||
{
|
||||
if (braille_co != console)
|
||||
return -EINVAL;
|
||||
braille_co = NULL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init braille_init(void)
|
||||
{
|
||||
register_keyboard_notifier(&keyboard_notifier_block);
|
||||
register_vt_notifier(&vt_notifier_block);
|
||||
return 0;
|
||||
}
|
||||
|
||||
console_initcall(braille_init);
|
||||
|
|
@ -277,6 +277,7 @@ u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode)
|
|||
return p->inverse_translations[m][glyph];
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(inverse_translate);
|
||||
|
||||
static void update_user_maps(void)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -110,6 +110,7 @@ const int max_vals[] = {
|
|||
const int NR_TYPES = ARRAY_SIZE(max_vals);
|
||||
|
||||
struct kbd_struct kbd_table[MAX_NR_CONSOLES];
|
||||
EXPORT_SYMBOL_GPL(kbd_table);
|
||||
static struct kbd_struct *kbd = kbd_table;
|
||||
|
||||
struct vt_spawn_console vt_spawn_con = {
|
||||
|
|
@ -260,6 +261,7 @@ void kd_mksound(unsigned int hz, unsigned int ticks)
|
|||
} else
|
||||
kd_nosound(0);
|
||||
}
|
||||
EXPORT_SYMBOL(kd_mksound);
|
||||
|
||||
/*
|
||||
* Setting the keyboard rate.
|
||||
|
|
|
|||
|
|
@ -4004,6 +4004,7 @@ u16 screen_glyph(struct vc_data *vc, int offset)
|
|||
c |= 0x100;
|
||||
return c;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(screen_glyph);
|
||||
|
||||
/* used by vcs - note the word offset */
|
||||
unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
|
||||
|
|
|
|||
|
|
@ -91,6 +91,7 @@ void give_up_console(const struct consw *sw);
|
|||
#define CON_ENABLED (4)
|
||||
#define CON_BOOT (8)
|
||||
#define CON_ANYTIME (16) /* Safe to call when cpu is offline */
|
||||
#define CON_BRL (32) /* Used for a braille device */
|
||||
|
||||
struct console {
|
||||
char name[16];
|
||||
|
|
@ -121,6 +122,9 @@ extern struct tty_driver *console_device(int *);
|
|||
extern void console_stop(struct console *);
|
||||
extern void console_start(struct console *);
|
||||
extern int is_console_locked(void);
|
||||
extern int braille_register_console(struct console *, int index,
|
||||
char *console_options, char *braille_options);
|
||||
extern int braille_unregister_console(struct console *);
|
||||
|
||||
extern int console_suspend_enabled;
|
||||
|
||||
|
|
|
|||
|
|
@ -111,6 +111,9 @@ struct console_cmdline
|
|||
char name[8]; /* Name of the driver */
|
||||
int index; /* Minor dev. to use */
|
||||
char *options; /* Options for the driver */
|
||||
#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
|
||||
char *brl_options; /* Options for braille driver */
|
||||
#endif
|
||||
};
|
||||
|
||||
#define MAX_CMDLINECONSOLES 8
|
||||
|
|
@ -808,15 +811,60 @@ static void call_console_drivers(unsigned start, unsigned end)
|
|||
|
||||
#endif
|
||||
|
||||
static int __add_preferred_console(char *name, int idx, char *options,
|
||||
char *brl_options)
|
||||
{
|
||||
struct console_cmdline *c;
|
||||
int i;
|
||||
|
||||
/*
|
||||
* See if this tty is not yet registered, and
|
||||
* if we have a slot free.
|
||||
*/
|
||||
for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++)
|
||||
if (strcmp(console_cmdline[i].name, name) == 0 &&
|
||||
console_cmdline[i].index == idx) {
|
||||
if (!brl_options)
|
||||
selected_console = i;
|
||||
return 0;
|
||||
}
|
||||
if (i == MAX_CMDLINECONSOLES)
|
||||
return -E2BIG;
|
||||
if (!brl_options)
|
||||
selected_console = i;
|
||||
c = &console_cmdline[i];
|
||||
strlcpy(c->name, name, sizeof(c->name));
|
||||
c->options = options;
|
||||
#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
|
||||
c->brl_options = brl_options;
|
||||
#endif
|
||||
c->index = idx;
|
||||
return 0;
|
||||
}
|
||||
/*
|
||||
* Set up a list of consoles. Called from init/main.c
|
||||
*/
|
||||
static int __init console_setup(char *str)
|
||||
{
|
||||
char buf[sizeof(console_cmdline[0].name) + 4]; /* 4 for index */
|
||||
char *s, *options;
|
||||
char *s, *options, *brl_options = NULL;
|
||||
int idx;
|
||||
|
||||
#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
|
||||
if (!memcmp(str, "brl,", 4)) {
|
||||
brl_options = "";
|
||||
str += 4;
|
||||
} else if (!memcmp(str, "brl=", 4)) {
|
||||
brl_options = str + 4;
|
||||
str = strchr(brl_options, ',');
|
||||
if (!str) {
|
||||
printk(KERN_ERR "need port name after brl=\n");
|
||||
return 1;
|
||||
}
|
||||
*(str++) = 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Decode str into name, index, options.
|
||||
*/
|
||||
|
|
@ -841,7 +889,7 @@ static int __init console_setup(char *str)
|
|||
idx = simple_strtoul(s, NULL, 10);
|
||||
*s = 0;
|
||||
|
||||
add_preferred_console(buf, idx, options);
|
||||
__add_preferred_console(buf, idx, options, brl_options);
|
||||
return 1;
|
||||
}
|
||||
__setup("console=", console_setup);
|
||||
|
|
@ -861,28 +909,7 @@ __setup("console=", console_setup);
|
|||
*/
|
||||
int add_preferred_console(char *name, int idx, char *options)
|
||||
{
|
||||
struct console_cmdline *c;
|
||||
int i;
|
||||
|
||||
/*
|
||||
* See if this tty is not yet registered, and
|
||||
* if we have a slot free.
|
||||
*/
|
||||
for (i = 0; i < MAX_CMDLINECONSOLES && console_cmdline[i].name[0]; i++)
|
||||
if (strcmp(console_cmdline[i].name, name) == 0 &&
|
||||
console_cmdline[i].index == idx) {
|
||||
selected_console = i;
|
||||
return 0;
|
||||
}
|
||||
if (i == MAX_CMDLINECONSOLES)
|
||||
return -E2BIG;
|
||||
selected_console = i;
|
||||
c = &console_cmdline[i];
|
||||
memcpy(c->name, name, sizeof(c->name));
|
||||
c->name[sizeof(c->name) - 1] = 0;
|
||||
c->options = options;
|
||||
c->index = idx;
|
||||
return 0;
|
||||
return __add_preferred_console(name, idx, options, NULL);
|
||||
}
|
||||
|
||||
int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options)
|
||||
|
|
@ -1163,6 +1190,16 @@ void register_console(struct console *console)
|
|||
continue;
|
||||
if (console->index < 0)
|
||||
console->index = console_cmdline[i].index;
|
||||
#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
|
||||
if (console_cmdline[i].brl_options) {
|
||||
console->flags |= CON_BRL;
|
||||
braille_register_console(console,
|
||||
console_cmdline[i].index,
|
||||
console_cmdline[i].options,
|
||||
console_cmdline[i].brl_options);
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
if (console->setup &&
|
||||
console->setup(console, console_cmdline[i].options) != 0)
|
||||
break;
|
||||
|
|
@ -1221,6 +1258,11 @@ int unregister_console(struct console *console)
|
|||
struct console *a, *b;
|
||||
int res = 1;
|
||||
|
||||
#ifdef CONFIG_A11Y_BRAILLE_CONSOLE
|
||||
if (console->flags & CON_BRL)
|
||||
return braille_unregister_console(console);
|
||||
#endif
|
||||
|
||||
acquire_console_sem();
|
||||
if (console_drivers == console) {
|
||||
console_drivers=console->next;
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче