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home.md

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+---
+title: homepage
+description: 
+published: true
+date: 2024-03-07T22:18:27.322Z
+tags: 
+editor: markdown
+dateCreated: 2024-03-07T22:18:25.914Z
+---
+
+# Header
+Your content here

reference/keyboard-mapping.md

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+---
+title: Keyboard Mapping
+description: Changing keyboard mapping at the hwdb level
+published: true
+date: 2024-03-07T22:50:17.227Z
+tags: 
+editor: markdown
+dateCreated: 2024-03-07T22:50:15.696Z
+---
+
+References:
+- https://wiki.archlinux.org/index.php/Map_scancodes_to_keycodes
+- https://github.com/Earnestly/pkgbuilds/blob/master/system-config/hwdb-capslock-as-control.hwdb
+
+Maping keys is pretty simple, and if it's done at the udev level, it's universal, so it doesn't require any X or Wayland specific configuration.
+
+As an example, I map my compose key (menu key) to right meta (aka super, logo, windows, apple, or command key), and CapsLock to left Control.
+
+## Get Scancode
+
+First, get the scancode(s) of the key(s) you wish to change. Easiest way is to use `evteest(1)`. For each keypress, you'll get information similar to the following:
+
+```
+Event: time 1496690003.603531, -------------- SYN_REPORT ------------
+Event: time 1496690003.723467, type 4 (EV_MSC), code 4 (MSC_SCAN), value 70065
+Event: time 1496690003.723467, type 1 (EV_KEY), code 127 (KEY_COMPOSE), value 0
+```
+
+The code you will need to use in the udev hwdb config file is the `MSC_SCAN` value (in this case: 70065).
+
+## Get Hardware ID
+
+Next you will need the hardware Vendor and Product ids from `lsusb(1)`. These are two sets of four hexidecimal digits separated by a colon (:) printed right before the device name.
+
+```
+Bus 001 Device 005: ID 258a:1006 <keyboard name here>
+```
+
+In this example, the Vendor ID is `258a`, and the Product ID is `1006`.
+
+## Create udev hwdb Configuration
+
+Then create `/etc/udev/hwdb.d/61-custom-keyboard.hwdb` with the following contents:
+
+```
+evdev:input:b0003v258Ap1006*
+ KEYBOARD_KEY_70065=rightmeta
+ KEYBOARD_KEY_70039=leftctrl
+```
+
+A few notes on the format of this file:
+- The format for the device identifying line for usb devices is `evdev:input:b0003v<Vendor ID>p<ProductID>*`. 
+	- If `<Product ID>` and `<Vendor ID>` contain letters, they must be capitalized
+	- These scancodes can be quite device-specific, so it is wise to be specific to *at least* the vendor and product IDs
+	- There are methods for identifying atk keyboards as well. Check the Arch Wiki page listed in the references above for more info
+- Defining a key to change is done with `KEYBOARD_KEY_<scancode>=<new keycode>`
+	- `<scancode>` is the code we pulled from evtest earlier
+	- `<new keycode>` is the keycode we want to emit when the key is pressed. Names of keycodes are listed in `/usr/include/linux/input-event-codes.h`, and should be all lowercased in your udev config.
+- The filename `61-custom-keyboard.hwdb` is somewhat arbitrary, but make sure that you order your file *after* the existing `60-keyboard.hwdb`.
+
+## Update Hardware Database Index
+
+After changing the config files, the hwdb needs to be rebuilt:
+
+```
+# systemd-hwdb update
+```
+
+To start using this new hwdb, either reboot or tell udev to reload:
+
+```
+# udevadm trigger
+```
+
+Note that this will only work for adding or modifying existing key mappings. Deleted key mappings are kept in the kernel until a reboot.
+
+## Testing the New Mappings
+
+A simple test can be run before trying the keys directly:
+
+```
+# udevadm info /dev/input/by-path/*-usb-*-kbd | grep KEYBOARD_KEY
+```