README: revamp to reflect recent progress

Signed-off-by: James Calligeros <jcalligeros99@gmail.com>

README.md

@@ -1,41 +1,30 @@
 ## Asahi Linux speaker safety daemon
 
-This is still very much a work in progress, is probably not "proper" Rust,
+## IMPORTANT
-and almost definitely makes competent developers extremely sad.
+This software is still pre-release and not fit for use or testing on user machines. Please
+do not ask for help with installing or using this software, the Pipewire configuration,
+or enabling speaker output on your machine. An announcement will be made when speaker
+support is ready for use.
 
-We currently rely on a local version of the `alsa` crate, pending the merge of
+## Requirements
-bindings to `snd_ctl_elem_value_{read,write}` and `snd_ctl_elem_set_id`.
+* We currently rely on a local version of the `alsa` crate, as a release has not yet been
+  pushed to crates.io with the required bindings.
+* A patched eleven secret herbs and spices kernel
 
-## What works
+## Todo list
-* Parsing config file
+- [x] Data structures representing a speaker element
-* All borrows seem to work fine
+- [x] Parsing machine-specific values from a config file
-* Volume getting/setting
+- [x] Logging
-
+- [x] Mixer control data structures
-## Needs improvement
+- [x] Manipulating mixer controls
-* Probably everything
+- [x] Retrieving V/ISENSE values
-
+- [x] Model of voice coil/magnet temperatures
-## Need to implement
+- [x] Ramping volume according to safety model
-* Daemonise and loop
+- [x] Tolerate multiple sample rates
-* Threading (should probably make sure it works as intended first)
+- [ ] Sleep reliably while playback has stopped
-* Getting V/ISENSE (pending changes to the codec drivers, we have mock implementations)
+- [ ] Daemonise correctly
-* Actually fail safe (see below)
+- [ ] Kernel driver interlock
-
+- [ ] Packaging/distro-agnosticism
-## On failing safe
-We need a way to guarantee safety on _any_ fail condition. The TAS codecs have a safe
-mode which cuts all outputs down by 18 dB. This works out to being about half their
-full output capabiltiy. It might be worth having the `macaudio` driver start them
-explicitly in this mode, and only unlock full output capability with an IOCTL that
-can be sent by `speakersafetyd` when it's sure it has started correctly. We would
-then of course also need an IOCTL to do the opposite if we encounter a runtime error.
-
-It was suggested by someone on IRC that this would be conducive to some sort of
-keepalive IOCTL, where the driver would automatically put the codecs into safe mode
-if it didn't hear from us for a while. This seems like it would suck to implement.
-
-Like any SLA, it is likely that we will never be able to guarantee 100% safety for all
-nonstandard setups. The reference PipeWire DSP graph plus this should be enough for 99% of
-users, but I feel at some point those who insist on using Pulse or raw ALSA are just going
-to have to put up with a best effort service and accept the (small) risk of this failing.
 
 ## Sundry
 The `alsa` crate is Copyright (c) 2015-2021 David Henningsson, and other