Same story than hid_hw_raw_requests:
This allows to intercept and prevent or change the behavior of
hid_hw_output_report() from a bpf program.
The intent is to solve a couple of use case:
- firewalling a HID device: a firewall can monitor who opens the hidraw
nodes and then prevent or allow access to write operations on that
hidraw node.
- change the behavior of a device and emulate a new HID feature request
The hook is allowed to be run as sleepable so it can itself call
hid_hw_output_report(), which allows to "convert" one feature request into
another or even call the feature request on a different HID device on the
same physical device.
Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-7-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
We add 3 new tests:
- first, we make sure we can prevent the raw_request to happen
- second, we make sure that we can detect that a given hidraw client
was actually doing the request, and for that client only, call ourself
hid_bpf_hw_request(), returning a custom value
- last, we ensure that we can not loop between hooks for
hid_hw_raw_request() and manual calls to hid_bpf_hw_request() from that
hook
Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-6-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
When we attach a sleepable hook to hid_hw_raw_requests, we can (and in
many cases should) call ourself hid_bpf_raw_request(), to actually fetch
data from the device itself.
However, this means that we might enter an infinite loop between
hid_hw_raw_requests hooks and hid_bpf_hw_request() call.
To prevent that, if a hid_bpf_hw_request() call is emitted, we prevent
any new call of this kfunc by storing the information in the context.
This way we can always trace/monitor/filter the incoming bpf requests,
while preventing those loops to happen.
I don't think exposing "from_bpf" is very interesting because while
writing such a bpf program, you need to match at least the report number
and/or the source of the call. So a blind "if there is a
hid_hw_raw_request() call, I'm emitting another one" makes no real
sense.
Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-5-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This allows to intercept and prevent or change the behavior of
hid_hw_raw_request() from a bpf program.
The intent is to solve a couple of use case:
- firewalling a HID device: a firewall can monitor who opens the hidraw
nodes and then prevent or allow access to write operations on that
hidraw node.
- change the behavior of a device and emulate a new HID feature request
The hook is allowed to be run as sleepable so it can itself call
hid_bpf_hw_request(), which allows to "convert" one feature request into
another or even call the feature request on a different HID device on the
same physical device.
Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-4-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
We want to add sleepable callbacks for hid_hw_raw_request() and
hid_hw_output_report(), but we can not use a plain RCU for those.
Prepare for a SRCU so we can extend HID-BPF.
This changes a little bit how hid_bpf_device_init() behaves, as it may
now fail, so there is a tiny hid-core.c change to accommodate for this.
Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-3-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This allows to know who actually sent what when we process the request
to the device.
This will be useful for a BPF firewall program to allow or not requests
coming from a dedicated hidraw node client.
Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-2-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Looks like if a bpf program gets inserted and then removed,
hdev->bpf.device_data is then allocated, but the loop iterating
over the bpf program is never assigning ret.
This is a problem and also revealed another bug in which only the last
value of ret was checked. This effectively meant than only the last
program in the chain could change the size of the incoming buffer.
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/all/00f7b624-219f-4a05-a7ad-5335f15a41c7@moroto.mountain
Fixes: 4a86220e04 ("HID: bpf: remove tracing HID-BPF capability")
Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-1-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
* spelling fix: XBox -> Xbox, lowercase 'b' as per Microsoft branding
* rephrase: paddle -> paddles, the controller itself has more than one paddle
* rephrase: replace usage of "those" in favor of explicitly making reference
to the paddles
* grammatical fix: report -> reports, use present tense verb.
* spelling fix: interpret
* consistency: capitalize the first word in bullet points
Signed-off-by: Luis Felipe Hernandez <luis.hernandez093@gmail.com>
Link: https://patch.msgid.link/20240625105553.50830-1-luis.hernandez093@gmail.com
[bentiss: renamed the file into Xbox, not XBox]
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
It is useful to change the name, the phys and/or the uniq of a
struct hid_device during .rdesc_fixup().
For example, hid-uclogic.ko changes the uniq to store the firmware version
to differentiate between 2 devices sharing the same PID. In the same
way, changing the device name is useful when the device export 3 nodes,
all with the same name.
Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-16-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
The idea is to provide a list of stucts and their editable fields.
Currently no functional changes are introduced here, we will add some
more writeable fields in the next patch.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-15-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This is the current decision we took: we don't provide automatic loading
of HID-BPF by the kernel directly, but rely on an external tool for it.
This tool is currently udev-hid-bpf, so let's make people aware of it.
Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-11-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Very mechanical:
- Change HID_BPF_DEVICE_EVENT and HID_BPF_RDESC_FIXUP #defines
- add a matching SEC(".struct_ops.link")
- in ArtistPro16Gen2 make the 2 functions static and have a new one
calling them
Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-7-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
We drop the need for the attach() bpf syscall, but we need to set up
the hid_id field before calling __load().
The .bpf.c part is mechanical: we create one struct_ops per HID-BPF
program, as all the tests are for one program at a time.
Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-4-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
We do this implementation in several steps to not have the CI failing:
- first (this patch), we add struct_ops while keeping the existing infra
available
- then we change the selftests, the examples and the existing in-tree
HID-BPF programs
- then we remove the existing trace points making old HID-BPF obsolete
There are a few advantages of struct_ops over tracing:
- compatibility with sleepable programs (for hid_hw_raw_request() in
a later patch)
- a lot simpler in the kernel: it's a simple rcu protected list
- we can add more parameters to the function called without much trouble
- the "attach" is now generic through BPF-core: the caller just needs to
set hid_id and flags before calling __load().
- all the BPF tough part is not handled in BPF-core through generic
processing
- hid_bpf_ctx is now only writable where it needs be
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20240608-hid_bpf_struct_ops-v3-3-6ac6ade58329@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
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Merge tag 'for-linus-2024060801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid
Pull HID fixes from Benjamin Tissoires:
- fix potential read out of bounds in hid-asus (Andrew Ballance)
- fix endian-conversion on little endian systems in intel-ish-hid (Arnd
Bergmann)
- A couple of new input event codes (Aseda Aboagye)
- errors handling fixes in hid-nvidia-shield (Chen Ni), hid-nintendo
(Christophe JAILLET), hid-logitech-dj (José Expósito)
- current leakage fix while the device is in suspend on a i2c-hid
laptop (Johan Hovold)
- other assorted smaller fixes and device ID / quirk entry additions
* tag 'for-linus-2024060801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid:
HID: Ignore battery for ELAN touchscreens 2F2C and 4116
HID: i2c-hid: elan: fix reset suspend current leakage
dt-bindings: HID: i2c-hid: elan: add 'no-reset-on-power-off' property
dt-bindings: HID: i2c-hid: elan: add Elan eKTH5015M
dt-bindings: HID: i2c-hid: add dedicated Ilitek ILI2901 schema
input: Add support for "Do Not Disturb"
input: Add event code for accessibility key
hid: asus: asus_report_fixup: fix potential read out of bounds
HID: logitech-hidpp: add missing MODULE_DESCRIPTION() macro
HID: intel-ish-hid: fix endian-conversion
HID: nintendo: Fix an error handling path in nintendo_hid_probe()
HID: logitech-dj: Fix memory leak in logi_dj_recv_switch_to_dj_mode()
HID: core: remove unnecessary WARN_ON() in implement()
HID: nvidia-shield: Add missing check for input_ff_create_memless
HID: intel-ish-hid: Fix build error for COMPILE_TEST
- Fix the initial state of the save button in 'make gconfig'
- Improve the Kconfig documentation
- Fix a Kconfig bug regarding property visibility
- Fix build breakage for systems where 'sed' is not installed in /bin
- Fix a false warning about missing MODULE_DESCRIPTION()
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Merge tag 'kbuild-fixes-v6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- Fix the initial state of the save button in 'make gconfig'
- Improve the Kconfig documentation
- Fix a Kconfig bug regarding property visibility
- Fix build breakage for systems where 'sed' is not installed in /bin
- Fix a false warning about missing MODULE_DESCRIPTION()
* tag 'kbuild-fixes-v6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
modpost: do not warn about missing MODULE_DESCRIPTION() for vmlinux.o
kbuild: explicitly run mksysmap as sed script from link-vmlinux.sh
kconfig: remove wrong expr_trans_bool()
kconfig: doc: document behavior of 'select' and 'imply' followed by 'if'
kconfig: doc: fix a typo in the note about 'imply'
kconfig: gconf: give a proper initial state to the Save button
kconfig: remove unneeded code for user-supplied values being out of range
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Merge tag 'media/v6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media fixes from Mauro Carvalho Chehab:
- fixes for the new ipu6 driver (and related fixes to mei csi driver)
- fix a double debugfs remove logic at mgb4 driver
- a documentation fix
* tag 'media/v6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
media: intel/ipu6: add csi2 port sanity check in notifier bound
media: intel/ipu6: update the maximum supported csi2 port number to 6
media: mei: csi: Warn less verbosely of a missing device fwnode
media: mei: csi: Put the IPU device reference
media: intel/ipu6: fix the buffer flags caused by wrong parentheses
media: intel/ipu6: Fix an error handling path in isys_probe()
media: intel/ipu6: Move isys_remove() close to isys_probe()
media: intel/ipu6: Fix some redundant resources freeing in ipu6_pci_remove()
media: Documentation: v4l: Fix ACTIVE route flag
media: mgb4: Fix double debugfs remove
that can result in missed wakeups and hung tasks.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2024-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf event fix from Ingo Molnar:
"Fix race between perf_event_free_task() and perf_event_release_kernel()
that can result in missed wakeups and hung tasks"
* tag 'perf-urgent-2024-06-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/core: Fix missing wakeup when waiting for context reference
All except the nilfs2 fix affect MM and all are singletons - see the
chagelogs for details.
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Merge tag 'mm-hotfixes-stable-2024-06-07-15-24' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull misc fixes from Andrew Morton:
"14 hotfixes, 6 of which are cc:stable.
All except the nilfs2 fix affect MM and all are singletons - see the
chagelogs for details"
* tag 'mm-hotfixes-stable-2024-06-07-15-24' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
nilfs2: fix nilfs_empty_dir() misjudgment and long loop on I/O errors
mm: fix xyz_noprof functions calling profiled functions
codetag: avoid race at alloc_slab_obj_exts
mm/hugetlb: do not call vma_add_reservation upon ENOMEM
mm/ksm: fix ksm_zero_pages accounting
mm/ksm: fix ksm_pages_scanned accounting
kmsan: do not wipe out origin when doing partial unpoisoning
vmalloc: check CONFIG_EXECMEM in is_vmalloc_or_module_addr()
mm: page_alloc: fix highatomic typing in multi-block buddies
nilfs2: fix potential kernel bug due to lack of writeback flag waiting
memcg: remove the lockdep assert from __mod_objcg_mlstate()
mm: arm64: fix the out-of-bounds issue in contpte_clear_young_dirty_ptes
mm: huge_mm: fix undefined reference to `mthp_stats' for CONFIG_SYSFS=n
mm: drop the 'anon_' prefix for swap-out mTHP counters
- set of interrupt handling and Kconfig fixes for gpio-tqmx86
- add a buffer for storing output values in gpio-tqmx86 as reading back the
registers always returns the input values
- add missing MODULE_DESCRIPTION()s to several GPIO drivers
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Merge tag 'gpio-fixes-for-v6.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
Pull gpio fixes from Bartosz Golaszewski:
- interrupt handling and Kconfig fixes for gpio-tqmx86
- add a buffer for storing output values in gpio-tqmx86 as reading back
the registers always returns the input values
- add missing MODULE_DESCRIPTION()s to several GPIO drivers
* tag 'gpio-fixes-for-v6.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
gpio: add missing MODULE_DESCRIPTION() macros
gpio: tqmx86: fix broken IRQ_TYPE_EDGE_BOTH interrupt type
gpio: tqmx86: store IRQ trigger type and unmask status separately
gpio: tqmx86: introduce shadow register for GPIO output value
gpio: tqmx86: fix typo in Kconfig label
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Merge tag 'io_uring-6.10-20240607' of git://git.kernel.dk/linux
Pull io_uring fixes from Jens Axboe:
- Fix a locking order issue with setting max async thread workers
(Hagar)
- Fix for a NULL pointer dereference for failed async flagged requests
using ring provided buffers. This doesn't affect the current kernel,
but it does affect older kernels, and is being queued up for 6.10
just to make the stable process easier (me)
- Fix for NAPI timeout calculations for how long to busy poll, and
subsequently how much to sleep post that if a wait timeout is passed
in (me)
- Fix for a regression in this release cycle, where we could end up
using a partially unitialized match value for io-wq (Su)
* tag 'io_uring-6.10-20240607' of git://git.kernel.dk/linux:
io_uring: fix possible deadlock in io_register_iowq_max_workers()
io_uring/io-wq: avoid garbage value of 'match' in io_wq_enqueue()
io_uring/napi: fix timeout calculation
io_uring: check for non-NULL file pointer in io_file_can_poll()
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Merge tag 'for-6.10-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
- fix handling of folio private changes.
The private value holds pointer to our extent buffer structure
representing a metadata range. Release and create of the range was
not properly synchronized when updating the private bit which ended
up in double folio_put, leading to all sorts of breakage
- fix a crash, reported as duplicate key in metadata, but caused by a
race of fsync and size extending write. Requires prealloc target
range + fsync and other conditions (log tree state, timing)
- fix leak of qgroup extent records after transaction abort
* tag 'for-6.10-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: protect folio::private when attaching extent buffer folios
btrfs: fix leak of qgroup extent records after transaction abort
btrfs: fix crash on racing fsync and size-extending write into prealloc
- Fix an occasional memory overwrite caused by a fix added in 6.10
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Merge tag 'nfsd-6.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux
Pull nfsd fix from Chuck Lever:
- Fix an occasional memory overwrite caused by a fix added in 6.10
* tag 'nfsd-6.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
SUNRPC: Fix loop termination condition in gss_free_in_token_pages()
* Another fix to avoid allocating pages that overlap with ERR_PTR, which
manifests on rv32.
* A revert for the badaccess patch I incorrectly picked up an early
version of.
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Merge tag 'riscv-for-linus-6.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fixes from Palmer Dabbelt:
- Another fix to avoid allocating pages that overlap with ERR_PTR,
which manifests on rv32
- A revert for the badaccess patch I incorrectly picked up an early
version of
* tag 'riscv-for-linus-6.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
Revert "riscv: mm: accelerate pagefault when badaccess"
riscv: fix overlap of allocated page and PTR_ERR
- Do not create PT_LOAD program header for the kenel image when
the virtual memory informaton in OS_INFO data is not available.
That fixes stand-alone dump failures against kernels that do not
provide the virtual memory informaton
- Add KVM s390 shared zeropage selftest
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Merge tag 's390-6.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Alexander Gordeev:
- Do not create PT_LOAD program header for the kenel image when the
virtual memory informaton in OS_INFO data is not available. That
fixes stand-alone dump failures against kernels that do not provide
the virtual memory informaton
- Add KVM s390 shared zeropage selftest
* tag 's390-6.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
KVM: s390x: selftests: Add shared zeropage test
s390/crash: Do not use VM info if os_info does not have it
Highlights:
- Default silead touchscreen driver to 10 fingers and drop 10 finger setting
from all DMI quirks. More of a cleanup then a pure fix, but since the DMI
quirks always get updated through the fixes branch this avoids conflicts.
- Kconfig fix for randconfig builds
- dell-smbios: Fix wrong token data in sysfs
- amd-hsmp: Fix driver poking unsupported hw when loaded manually
The following is an automated git shortlog grouped by driver:
Input:
- silead - Always support 10 fingers
dell-smbios:
- Simplify error handling
- Fix wrong token data in sysfs
platform/x86/amd/hsmp:
- Check HSMP support on AMD family of processors
touchscreen_dmi:
- Use 2-argument strscpy()
- Drop "silead,max-fingers" property
yt2-1380:
- add CONFIG_EXTCON dependency
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Merge tag 'platform-drivers-x86-v6.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86
Pull x86 platform driver fixes from Hans de Goede:
- Default silead touchscreen driver to 10 fingers and drop 10 finger
setting from all DMI quirks. More of a cleanup then a pure fix, but
since the DMI quirks always get updated through the fixes branch
this avoids conflicts.
- Kconfig fix for randconfig builds
- dell-smbios: Fix wrong token data in sysfs
- amd-hsmp: Fix driver poking unsupported hw when loaded manually
* tag 'platform-drivers-x86-v6.10-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86:
platform/x86/amd/hsmp: Check HSMP support on AMD family of processors
platform/x86: dell-smbios: Simplify error handling
platform/x86: dell-smbios: Fix wrong token data in sysfs
platform/x86: yt2-1380: add CONFIG_EXTCON dependency
platform/x86: touchscreen_dmi: Use 2-argument strscpy()
platform/x86: touchscreen_dmi: Drop "silead,max-fingers" property
Input: silead - Always support 10 fingers
Including:
- Core:
- Make iommu-dma code recognize 'force_aperture' again
- Fix for potential NULL-ptr dereference from iommu_sva_bind_device()
return value
- AMD IOMMU fixes:
- Fix lockdep splat for invalid wait context
- Add feature bit check before enabling PPR
- Make workqueue name fit into buffer
- Fix memory leak in sysfs code
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Merge tag 'iommu-fixes-v6.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull iommu fixes from Joerg Roedel:
"Core:
- Make iommu-dma code recognize 'force_aperture' again
- Fix for potential NULL-ptr dereference from iommu_sva_bind_device()
return value
AMD IOMMU fixes:
- Fix lockdep splat for invalid wait context
- Add feature bit check before enabling PPR
- Make workqueue name fit into buffer
- Fix memory leak in sysfs code"
* tag 'iommu-fixes-v6.10-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
iommu/amd: Fix Invalid wait context issue
iommu/amd: Check EFR[EPHSup] bit before enabling PPR
iommu/amd: Fix workqueue name
iommu: Return right value in iommu_sva_bind_device()
iommu/dma: Fix domain init
iommu/amd: Fix sysfs leak in iommu init
- Fix a regression for the PATA MacIO driver were it would fail to probe
because of the recent changes of initializing the limits in SCSI core.
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Merge tag 'ata-6.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux
Pull ata fix from Niklas Cassel:
- Fix a regression for the PATA MacIO driver were it would fail to
probe because of the recent changes of initializing the limits in
SCSI core
* tag 'ata-6.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux:
ata: pata_macio: Fix max_segment_size with PAGE_SIZE == 64K
At least ASUS Zenbook 14 (2023) and ASUS Zenbook 14 Pro (2023) are affected.
The touchscreen reports a battery status of 0% and jumps to 1% when a
stylus is used.
The device ID was added and the battery ignore quirk was enabled for it.
[jkosina@suse.com: reformatted changelog a bit]
Signed-off-by: Louis Dalibard <ontake@ontake.dev>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
The Elan eKTH5015M touch controller found on the Lenovo ThinkPad X13s
shares the VCC33 supply with other peripherals that may remain powered
during suspend (e.g. when enabled as wakeup sources).
The reset line is also wired so that it can be left deasserted when the
supply is off.
This is important as it avoids holding the controller in reset for
extended periods of time when it remains powered, which can lead to
increased power consumption, and also avoids leaking current through the
X13s reset circuitry during suspend (and after driver unbind).
Use the new 'no-reset-on-power-off' devicetree property to determine
when reset needs to be asserted on power down.
Notably this also avoids wasting power on machine variants without a
touchscreen for which the driver would otherwise exit probe with reset
asserted.
Fixes: bd3cba00dc ("HID: i2c-hid: elan: Add support for Elan eKTH6915 i2c-hid touchscreens")
Cc: <stable@vger.kernel.org> # 6.0
Cc: Douglas Anderson <dianders@chromium.org>
Tested-by: Steev Klimaszewski <steev@kali.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20240507144821.12275-5-johan+linaro@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
When the power supply is shared with other peripherals the reset line
can be wired in such a way that it can remain deasserted regardless of
whether the supply is on or not.
This is important as it can be used to avoid holding the controller in
reset for extended periods of time when it remains powered, something
which can lead to increased power consumption. Leaving reset deasserted
also avoids leaking current through the reset circuitry pull-up
resistors.
Add a new 'no-reset-on-power-off' devicetree property which can be used
by the OS to determine when reset needs to be asserted on power down.
Note that this property can also be used when the supply cannot be
turned off by the OS at all.
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240507144821.12275-4-johan+linaro@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
Add a compatible string for the Elan eKTH5015M touch controller.
Judging from the current binding and commit bd3cba00dc ("HID: i2c-hid:
elan: Add support for Elan eKTH6915 i2c-hid touchscreens"), eKTH5015M
appears to be compatible with eKTH6915. Notably the power-on sequence is
the same.
While at it, drop a redundant label from the example.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20240507144821.12275-3-johan+linaro@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
The Ilitek ILI2901 touch screen controller was apparently incorrectly
added to the Elan eKTH6915 schema simply because it also has a reset
gpio and is currently managed by the Elan driver in Linux.
The two controllers are not related even if an unfortunate wording in
the commit message adding the Ilitek compatible made it sound like they
were.
Add a dedicated schema for the ILI2901 which does not specify the I2C
address (which is likely 0x41 rather than 0x10 as for other Ilitek touch
controllers) to avoid cluttering the Elan schema with unrelated devices
and to make it easier to find the correct schema when adding further
Ilitek controllers.
Fixes: d74ac6f60a ("dt-bindings: HID: i2c-hid: elan: Introduce Ilitek ili2901")
Cc: Zhengqiao Xia <xiazhengqiao@huaqin.corp-partner.google.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20240507144821.12275-2-johan+linaro@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
HUTRR94 added support for a new usage titled "System Do Not Disturb"
which toggles a system-wide Do Not Disturb setting. This commit simply
adds a new event code for the usage.
Signed-off-by: Aseda Aboagye <aaboagye@chromium.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Link: https://lore.kernel.org/r/Zl-gUHE70s7wCAoB@google.com
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
