Update documentation

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## 0.20.0 (TBD)
+## 0.20.0 (November 30, 2024)
 
 * Add support for Raspberry Pi Compute Module 5.
 * **Gpio**: Add `set_bias` to `InputPin` (contributed by @KronsyC).

src/pwm.rs

@@ -20,44 +20,20 @@
 //! use with other peripherals. Be careful not to enable two peripherals on the same pin
 //! at the same time.
 //!
-//! ## Using PWM without superuser privileges (`sudo`)
-//!
-//! As of kernel version 4.14.34, released on April 16 2018, it's possible to
-//! configure your Raspberry Pi to allow non-root access to PWM. 4.14.34 includes
-//! a [patch] that allows `udev` to change file permissions when a
-//! PWM channel is exported. This will let any user that's a member of the `gpio`
-//! group configure PWM without having to use `sudo`.
-//!
-//! The `udev` rules needed to make this work haven't been patched in yet as of
-//! June 2018, but you can easily add them yourself. Make sure you're running
-//! 4.14.34 or later, and append the following snippet to
-//! `/etc/udev/rules.d/99-com.rules`. Reboot the Raspberry Pi afterwards.
-//!
-//! ```text
-//! SUBSYSTEM=="pwm*", PROGRAM="/bin/sh -c '\
-//!     chown -R root:gpio /sys/class/pwm && chmod -R 770 /sys/class/pwm;\
-//!     chown -R root:gpio /sys/devices/platform/soc/*.pwm/pwm/pwmchip* &&\
-//!     chmod -R 770 /sys/devices/platform/soc/*.pwm/pwm/pwmchip*\
-//! '"
-//! ```
-//!
 //! ## Troubleshooting
 //!
 //! ### Permission denied
 //!
-//! If [`new`] returns an `io::ErrorKind::PermissionDenied`
-//! error, make sure `/sys/class/pwm` and all of its subdirectories
-//! are owned by `root:gpio`, the current user is a member of the `gpio` group
-//! and `udev` is properly configured as mentioned above. Alternatively, you can
-//! launch your application using `sudo`.
+//! If [`new`] returns an `io::ErrorKind::PermissionDenied` error, make sure
+//! `/sys/class/pwm` and its subdirectories has the appropriate permissions for the current user.
+//! Alternatively, you can launch your application using `sudo`.
 //!
 //! ### Not found
 //!
 //! If [`new`] returns an `io::ErrorKind::NotFound` error, you may have
 //! forgotten to enable the selected PWM channel. The configuration options
 //! to enable either of the two PWM channels are listed above.
 //!
-//! [patch]: https://github.com/raspberrypi/linux/issues/1983
 //! [`new`]: struct.Pwm.html#method.new
 
 use std::error;