snap: Need separate connection for each hidraw device

Signed-off-by: Daniel Schaefer <dhs@frame.work>

Author: JohnAZoidberg

README.md

@@ -40,8 +40,16 @@ You can find lots of examples in [EXAMPLES.md](./EXAMPLES.md).
 
 #### Snap Interfaces
 
-The snap uses strict confinement. After installing, connect the required interfaces
-to allow access to the hardware:
+The snap uses strict confinement. Several interfaces (`cros-ec`, `hidraw`) require
+store assertions or a gadget snap to provide slots, which are not available on
+standard desktop systems. For local testing, install with `--devmode`:
+
+```sh
+sudo snap install --dangerous --devmode framework-tool_*.snap
+```
+
+When installed from the snap store (with proper assertions), connect the required
+interfaces to allow access to the hardware:
 
 ```sh
 # Required for most functionality (EC communication)

contrib/snap.md

@@ -24,22 +24,19 @@ snapcraft clean
 
 ## Installing Locally
 
-Install the locally built snap (bypasses store signature check):
+Several interfaces (`cros-ec`, `hidraw`) require store assertions or a gadget
+snap to provide slots, which are not available on standard desktop systems.
+For local testing, install with `--devmode` to bypass confinement:
 
 ```sh
-sudo snap install --dangerous framework-tool_*.snap
+sudo snap install --dangerous --devmode framework-tool_*.snap
 ```
 
 ## Connecting Interfaces
 
-The snap uses strict confinement, so hardware interfaces must be connected
-manually after install:
-
-```sh
-for plug in cros-ec hardware-observe hidraw raw-usb block-devices io-ports-control physical-memory-observe; do
-  sudo snap connect framework-tool:$plug
-done
-```
+See the [Snap Interfaces](../../README.md#snap-interfaces) section in the README
+for the full list of interface connect commands (applicable when installed from
+the snap store with proper assertions).
 
 Verify the connections:
 

snap/snapcraft.yaml

@@ -25,8 +25,9 @@ grade: stable
 confinement: strict
 compression: lzo
 
-# /dev/cros_ec needs ioctl access, which requires custom-device interface.
-# This needs a store assertion for the slot. For local testing use --devmode.
+# custom-device needs a store assertion for the slot.
+# hidraw slots must be provided by the core or gadget snap.
+# For local testing use --devmode to bypass these restrictions.
 plugs:
   cros-ec:
     interface: custom-device