<div dir="ltr">Hi Mark,<div><br></div><div>There are no high-level docs, unfortunately. There's some valuable info in comments in drv.c, sync.c, async.c, img.c etc. but it only covers specific parts, not how they should interact.</div><div><br></div><div>There are 6 drivers for press-type sensors: aes3500.c, aes4000.c, fdu2000.c, upektc.c, uru4000.c, vcom5s.c. But there isn't much difference between press and swipe drivers. FP_SCAN_TYPE_* is used to determine which messages to show ("please touch the sensor" vs. "please swipe..."), and I think that's it. Besides that, all drivers essentially do the same thing: obtain the fingerprint image and submit it. You can use any driver as a reference.</div><div><br></div><div><div><br></div></div><div dir="ltr"><br><div class="gmail_quote"><div dir="ltr">On Fri, Mar 9, 2018 at 7:50 PM Mark Harfouche <<a href="mailto:mark.harfouche@gmail.com" target="_blank">mark.harfouche@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="m_8177662341642847222m_6183061558386683585m_-8744784386542286602markdown-here-wrapper"><p style="margin:0px 0px 1.2em!important">Hello all,</p>
<p style="margin:0px 0px 1.2em!important">I would like to develop a driver for the Validity 0091 sensor available on the Dell XPS13/15 9X60.</p>
<p style="margin:0px 0px 1.2em!important">I would say I have the driver reverse engineered to 95% (There might be a few things I still don’t understand from the internal state machine).<br><a href="https://github.com/hmaarrfk/Validity91" target="_blank">https://github.com/hmaarrfk/Validity91</a><br>WIP: <a href="https://github.com/freedesktop/libfprint" target="_blank">https://github.com/freedesktop/libfprint</a></p>
<p style="margin:0px 0px 1.2em!important">I found the libfprint source, can compile it, and started creating my own driver.</p>
<p style="margin:0px 0px 1.2em!important">However, I am confused about the internal workings of libfprint and the functions I need to define.<br>I tried to follow examples that were included, but it seemed that they were mostly “swipe”‘ sensors, and not capacitive style sensor.<br>Is there any good documentation about the state machines I need to implement with regards to the functions</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important">    .open = dev_open,
    .close = dev_close,
    .activate = dev_activate,
    .deactivate = dev_deactivate,
    .change_state = dev_change_state,
</code></pre><p style="margin:0px 0px 1.2em!important">Thanks,</p>
<p style="margin:0px 0px 1.2em!important">Mark</p>
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</blockquote></div></div></div>