74 lines
2.7 KiB
Bash
74 lines
2.7 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 2017,2018 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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# 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: $2\n" >/dev/kmsg
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}
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# Get the permissions of the filesystem containing the given path
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get_filesystem_access() {
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[ -z "${1}" ] && return
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fs_device="$(df ${1} | awk 'NR==2 { print $1 }')"
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fs_access="$(awk -v dev="${fs_device}" '$0 ~ dev { print substr($4,1,2) }' < /proc/mounts)"
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echo ${fs_access}
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}
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# Get the mount point of the filesystem containing the given path
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get_filesystem_mount_point() {
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[ -z "${1}" ] && return
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fs_device="$(df ${1} | awk 'NR==2 { print $1 }')"
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fs_mount_point="$(awk -v dev="${fs_device}" '$0 ~ dev { print $2 }' < /proc/mounts)"
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echo ${fs_mount_point}
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}
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# Remount the filesystem containing the given path as 'read-write' if it was
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# mounted as 'read-only'.
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set_filesystem_rw_access() {
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[ -z "${1}" ] && return
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if [ "$(get_filesystem_access ${1})" = "ro" ]; then
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mount -o remount,rw $(get_filesystem_mount_point ${1})
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fi
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}
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# Do nothing if the wireless node does not exist on the device tree
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[ -d "/proc/device-tree/wireless" ] || exit 0
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# Do nothing if the module is already loaded
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grep -qws 'wlan' /proc/modules && exit 0
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FS_ORIGINAL_ACCESS="$(get_filesystem_access ${FIRMWARE_DIR})"
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# Load the wireless module with the params defined in modprobe.d/qualcomm.conf
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# and reduce the console log level to avoid debug messages at boot time
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LOGLEVEL="$(sed -ne 's,^kernel.printk[^=]*=[[:blank:]]*\(.*\)$,\1,g;T;p' /etc/sysctl.conf 2>/dev/null)"
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[ -n "${LOGLEVEL}" ] && sysctl -q -w kernel.printk="${LOGLEVEL}"
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modprobe wlan
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# Verify the interface is present
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[ -d "/sys/class/net/wlan0" ] || log "3" "[ERROR] Loading wlan module"
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# Restore the filesystem with the original access permissions if it has been
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# changed inside the script.
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if [ "$(get_filesystem_access ${FIRMWARE_DIR})" != "${FS_ORIGINAL_ACCESS}" ]; then
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mount -o remount,${FS_ORIGINAL_ACCESS} $(get_filesystem_mount_point ${FIRMWARE_DIR})
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fi
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