68 lines
2.3 KiB
Bash
68 lines
2.3 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 2023,2024 Digi International Inc.
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, you can obtain one at http://mozilla.org/MPL/2.0/.
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#
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# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#
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MMC_NODE="##NODE##"
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# Lock file to track and prevent to re-run the script when rebinding the MMC node.
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LOCKFILE="/tmp/qca65x4.lock"
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# At this point of the boot (udev script), the system log (syslog) is not
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# available yet, so use the kernel log buffer from userspace.
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log() {
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printf "<$1>qca65x4: $2\n" >/dev/kmsg
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}
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if test -f "$LOCKFILE"; then
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# Script called due to rebinding of mmc. Ignore it and remove the lock file.
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rm $LOCKFILE
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exit 1
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fi
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# Force re-detection of the mmc node
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rebind_mmc_node() {
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DRIVER_NODE=$(find /sys/bus/platform/drivers -name ${MMC_NODE} | xargs dirname 2> /dev/null) || return 1
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echo ${MMC_NODE} > ${DRIVER_NODE}/unbind
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# Give some time to the mmc driver to re-detect the MMC node in order to re-initialize it.
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sleep 2
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echo ${MMC_NODE} > ${DRIVER_NODE}/bind
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}
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load_and_check() {
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modprobe wlan
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[ -d "/sys/class/net/wlan0" ] && return 0 || return 1
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}
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# Do nothing if the wireless node does not exist on the device tree
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[ -d "/proc/device-tree/wireless" ] || exit 0
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# Do nothing if the module is already loaded
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grep -qws 'wlan' /proc/modules && exit 0
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load_and_check && log "3" "[INFO] wlan module loaded" && exit 0
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# If we are here, the load has failed. Retry.
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log "3" "[WARN] Loading wlan module failed, retrying..."
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# Create a lock file, as rebinding the mmc node will trigger the udev rules
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# Do not remove the file at the end, it will be called by the script in the rebind call
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touch $LOCKFILE
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# Try by re-binding the mmc node.
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rebind_mmc_node && load_and_check && log "3" "[INFO] wlan module loaded" && exit 0
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log "3" "[ERROR] Loading wlan module"
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exit 1
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