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+Driver documentation for yealink usb-p1k phones
+
+0. Status
+~~~~~~~~~
+
+The p1k is a relatively cheap usb 1.1 phone with:
+  - keyboard            full support, yealink.ko / input event API
+  - LCD                 full support, yealink.ko / sysfs API
+  - LED                 full support, yealink.ko / sysfs API
+  - dialtone            full support, yealink.ko / sysfs API
+  - ringtone            full support, yealink.ko / sysfs API
+  - audio playback      full support, snd_usb_audio.ko / alsa API
+  - audio record        full support, snd_usb_audio.ko / alsa API
+
+For vendor documentation see http://www.yealink.com
+
+
+1. Compilation (stand alone version)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Currently only kernel 2.6.x.y versions are supported.
+In order to build the yealink.ko module do:
+
+  make
+
+If you encounter problems please check if in the MAKE_OPTS variable in
+the Makefile is pointing to the location where your kernel sources
+are located, default /usr/src/linux.
+
+
+
+2. keyboard features
+~~~~~~~~~~~~~~~~~~~~
+The current mapping in the kernel is provided by the map_p1k_to_key
+function:
+
+   Physical USB-P1K button layout       input events
+
+
+              up                             up
+        IN           OUT                left,   right
+             down                           down
+
+      pickup   C    hangup              enter, backspace, escape
+        1      2      3                 1, 2, 3
+        4      5      6                 4, 5, 6,
+        7      8      9                 7, 8, 9,
+        *      0      #                 *, 0, #,
+
+  The "up" and "down" keys, are symbolised by arrows on the button.
+  The "pickup" and "hangup" keys are symbolised by a green and red phone
+  on the button.
+
+
+3. LCD features
+~~~~~~~~~~~~~~~
+The LCD is divided and organised as a 3 line display:
+
+    |[]   [][]   [][]   [][]   in   |[][]
+    |[] M [][] D [][] : [][]   out  |[][]
+                              store
+
+    NEW REP         SU MO TU WE TH FR SA
+
+    [] [] [] [] [] [] [] [] [] [] [] []
+    [] [] [] [] [] [] [] [] [] [] [] []
+
+
+Line 1  Format (see below)      : 18.e8.M8.88...188
+        Icon names              :   M  D  :  IN OUT STORE
+Line 2  Format                  : .........
+        Icon name               : NEW REP SU MO TU WE TH FR SA
+Line 3  Format                  : 888888888888
+
+
+Format description:
+  From a user space perspective the world is seperated in "digits" and "icons".
+  A digit can have a character set, an icon can only be ON or OFF.
+
+  Format specifier
+    '8' :  Generic 7 segment digit with individual addressable segments
+
+    Reduced capabillity 7 segm digit, when segments are hard wired together.
+    '1' : 2 segments digit only able to produce a 1.
+    'e' : Most significant day of the month digit,
+          able to produce at least 1 2 3.
+    'M' : Most significant minute digit,
+          able to produce at least 0 1 2 3 4 5.
+
+    Icons or pictograms:
+    '.' : For example like AM, PM, SU, a 'dot' .. or other single segment
+          elements.
+
+
+4. Driver usage
+~~~~~~~~~~~~~~~
+For userland the following interfaces are available using the sysfs interface:
+  /sys/.../
+           line1        Read/Write, lcd line1
+           line2        Read/Write, lcd line2
+           line3        Read/Write, lcd line3
+
+           get_icons    Read, returns a set of available icons.
+           hide_icon    Write, hide the element by writing the icon name.
+           show_icon    Write, display the element by writing the icon name.
+
+           map_seg7     Read/Write, the 7 segments char set, common for all
+                        yealink phones. (see map_to_7segment.h)
+
+           ringtone     Write, upload binary representation of a ringtone,
+                        see yealink.c. status EXPERIMENTAL due to potential
+                        races between async. and sync usb calls.
+
+
+4.1 lineX
+~~~~~~~~~
+Reading /sys/../lineX will return the format string with its current value:
+
+  Example:
+  cat ./line3
+  888888888888
+  Linux Rocks!
+
+Writing to /sys/../lineX will set the coresponding LCD line.
+ - Excess characters are ignored.
+ - If less characters are written than allowed, the remaining digits are
+   unchanged.
+ - The tab '\t'and '\n' char does not overwrite the original content.
+ - Writing a space to an icon will always hide its content.
+
+  Example:
+  date +"%m.%e.%k:%M"  | sed 's/^0/ /' > ./line1
+
+  Will update the LCD with the current date & time.
+
+
+4.2 get_icons
+~~~~~~~~~~~~~
+Reading will return all available icon names and its current settings:
+
+  cat ./get_icons
+  on M
+  on D
+  on :
+     IN
+     OUT
+     STORE
+     NEW
+     REP
+     SU
+     MO
+     TU
+     WE
+     TH
+     FR
+     SA
+     LED
+     DIALTONE
+     RINGTONE
+
+
+4.3 show/hide icons
+~~~~~~~~~~~~~~~~~~~
+Writing to these files will update the state of the icon.
+Only one icon at a time can be updated.
+
+If an icon is also on a ./lineX the corresponding value is
+updated with the first letter of the icon.
+
+  Example - light up the store icon:
+  echo -n "STORE" > ./show_icon
+
+  cat ./line1
+  18.e8.M8.88...188
+               S
+
+  Example - sound the ringtone for 10 seconds:
+  echo -n RINGTONE > /sys/..../show_icon
+  sleep 10
+  echo -n RINGTONE > /sys/..../hide_icon
+
+
+5. Sound features
+~~~~~~~~~~~~~~~~~
+Sound is supported by the ALSA driver: snd_usb_audio
+
+One 16-bit channel with sample and playback rates of 8000 Hz is the practical
+limit of the device.
+
+  Example - recording test:
+  arecord -v -d 10 -r 8000 -f S16_LE -t wav  foobar.wav
+
+  Example - playback test:
+  aplay foobar.wav
+
+
+6. Credits & Acknowledgments
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  - Olivier Vandorpe, for starting the usbb2k-api project doing much of
+        the reverse engineering.
+  - Martin Diehl, for pointing out how to handle USB memory allocation.
+  - Dmitry Torokhov, for the numerous code reviews and suggestions.
+