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| author | Anton Staaf <robotboy@chromium.org> | 2015-03-16 10:56:37 -0700 |
|---|---|---|
| committer | ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> | 2015-03-16 23:04:39 +0000 |
| commit | fa671e65917b6673250af23e58372bcec272ca0e (patch) | |
| tree | 342eb28f7e77b28113fd74308fc02c21ad15ef5a /extra | |
| parent | 90ef8b700629381ac62aae4f87612ef84b32cb35 (diff) | |
| download | chrome-ec-fa671e65917b6673250af23e58372bcec272ca0e.tar.gz | |
USB: Add udev rule to handle CCD devices
This udev rule creates a directory in /dev/google for each
device attached. The name of the directory is unique to the
device and is prefixed with the device product name. Within
the directory there is a serial directory that contains
symlinks to each USB serial port exposed by the device. The
symlinks are named based on the USB interface name provided
by the EC. Additional subdirectories can be added for I2C,
JTAG, GPIOs, and SPI as needed.
Signed-off-by: Anton Staaf <robotboy@chromium.org>
BRANCH=None
BUG=None
TEST=Verify that two different CCD devices generate uniquely named
entries.
Change-Id: I7e6f2ace29b7302c7c072bcf6aab7c8f060b993a
Reviewed-on: https://chromium-review.googlesource.com/260420
Trybot-Ready: Anton Staaf <robotboy@chromium.org>
Tested-by: Anton Staaf <robotboy@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Commit-Queue: Anton Staaf <robotboy@chromium.org>
Diffstat (limited to 'extra')
| -rw-r--r-- | extra/usb_serial/50-google-serial.rules | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/extra/usb_serial/50-google-serial.rules b/extra/usb_serial/50-google-serial.rules new file mode 100644 index 0000000000..ee2db62543 --- /dev/null +++ b/extra/usb_serial/50-google-serial.rules @@ -0,0 +1,14 @@ +# +# Match a Google device with an interface that supports the simple serial +# driver. +# +# The first rule matches the google VID and records the product name, USB bus +# number and USB device path (the device path is the list of hub ports between +# the root and the device). This becomes a unique name under which the second +# rule creates the symlinks to the serial devices. The second rule will only +# fire if the .GOOGLE_CCD_NAME variable has been set by the first rule. If +# some other udev rule has set the same name previously, there would be a +# conflict, so this name is chosen to be verbose and likely unique. +# +SUBSYSTEMS=="usb", ATTRS{idVendor}=="18d1", ENV{.GOOGLE_CCD_NAME}="$attr{product}-$attr{busnum}-$attr{devpath}" +SUBSYSTEMS=="usb", ENV{.GOOGLE_CCD_NAME}!="", ATTRS{bInterfaceClass}=="ff", ATTRS{bInterfaceSubClass}=="50", ATTRS{bInterfaceProtocol}=="01", OPTIONS+="string_escape=replace", SYMLINK+="google/$env{.GOOGLE_CCD_NAME}/serial/$attr{interface}" |