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Linus Walleij ef1a6ab36d Input: zinitix - do not report shadow fingers 
[ Upstream commit e941dc13fd ]

I observed the following problem with the BT404 touch pad
running the Phosh UI:

When e.g. typing on the virtual keyboard pressing "g" would
produce "ggg".

After some analysis it turns out the firmware reports that three
fingers hit that coordinate at the same time, finger 0, 2 and
4 (of the five available 0,1,2,3,4).

DOWN
  Zinitix-TS 3-0020: finger 0 down (246, 395)
  Zinitix-TS 3-0020: finger 1 up (0, 0)
  Zinitix-TS 3-0020: finger 2 down (246, 395)
  Zinitix-TS 3-0020: finger 3 up (0, 0)
  Zinitix-TS 3-0020: finger 4 down (246, 395)
UP
  Zinitix-TS 3-0020: finger 0 up (246, 395)
  Zinitix-TS 3-0020: finger 2 up (246, 395)
  Zinitix-TS 3-0020: finger 4 up (246, 395)

This is one touch and release: i.e. this is all reported on
touch (down) and release.

There is a field in the struct touch_event called finger_cnt
which is actually a bitmask of the fingers active in the
event.

Rename this field finger_mask as this matches the use contents
better, then use for_each_set_bit() to iterate over just the
fingers that are actally active.

Factor out a finger reporting function zinitix_report_fingers()
to handle all fingers.

Also be more careful in reporting finger down/up: we were
reporting every event with input_mt_report_slot_state(..., true);
but this should only be reported on finger down or move,
not on finger up, so also add code to check p->sub_status
to see what is happening and report correctly.

After this my Zinitix BT404 touchscreen report fingers
flawlessly.

The vendor drive I have notably does not use the "finger_cnt"
and contains obviously incorrect code like this:

  if (touch_dev->touch_info.finger_cnt > MAX_SUPPORTED_FINGER_NUM)
      touch_dev->touch_info.finger_cnt = MAX_SUPPORTED_FINGER_NUM;

As MAX_SUPPORTED_FINGER_NUM is an ordinal and the field is
a bitmask this seems quite confused.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20220228233017.2270599-1-linus.walleij@linaro.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-04-08 14:39:48 +02:00
..
accessibility speakup-dectlk: Restore pitch setting 2022-02-16 12:54:30 +01:00
acpi ACPI: video: Force backlight native for Clevo NL5xRU and NL5xNU 2022-03-28 09:57:10 +02:00
amba ARM: 9120/1: Revert "amba: make use of -1 IRQs warn" 2021-11-06 14:10:09 +01:00
android binder: fix handling of error during copy 2022-01-27 10:54:06 +01:00
ata ata: pata_hpt37x: fix PCI clock detection 2022-03-08 19:09:31 +01:00
atm atm: eni: Add check for dma_map_single 2022-03-23 09:13:27 +01:00
auxdisplay auxdisplay: ht16k33: Fix frame buffer device blanking 2021-11-18 14:04:24 +01:00
base driver core: Free DMA range map when device is released 2022-03-02 11:42:56 +01:00
bcma bcma: Fix memory leak for internally-handled cores 2021-09-15 09:50:45 +02:00
block virtio-blk: Don't use MAX_DISCARD_SEGMENTS if max_discard_seg is zero 2022-03-16 14:15:57 +01:00
bluetooth Bluetooth: vhci: Set HCI_QUIRK_VALID_LE_STATES 2022-01-27 10:54:18 +01:00
bus Revert "drivers: bus: simple-pm-bus: Add support for probing simple bus only devices" 2022-02-05 12:37:55 +01:00
cdrom
char virtio_console: break out of buf poll on remove 2022-04-08 14:39:47 +02:00
clk clk: qcom: gdsc: Add support to update GDSC transition delay 2022-03-16 14:15:56 +01:00
clocksource ARM: dts: Use 32KiHz oscillator on devkit8000 2022-03-08 19:09:36 +01:00
connector
counter counter: stm32-lptimer-cnt: remove iio counter abi 2022-01-27 10:54:08 +01:00
cpufreq cpufreq: Fix initialization of min and max frequency QoS requests 2022-01-27 10:54:17 +01:00
cpuidle cpuidle: Fix kobject memory leaks in error paths 2021-11-18 14:04:05 +01:00
crypto crypto: qat - disable registration of algorithms 2022-03-28 09:57:10 +02:00
dax
dca
devfreq
dio
dma dmaengine: shdma: Fix runtime PM imbalance on error 2022-03-08 19:09:30 +01:00
dma-buf dma-buf: heaps: Fix potential spectre v1 gadget 2022-02-08 18:30:36 +01:00
edac EDAC: Fix calculation of returned address and next offset in edac_align_ptr() 2022-02-23 12:01:07 +01:00
eisa
extcon
firewire
firmware efi: fix return value of __setup handlers 2022-03-23 09:13:27 +01:00
fpga fpga: machxo2-spi: Fix missing error code in machxo2_write_complete() 2021-09-30 10:11:04 +02:00
fsi
gnss
gpio Revert "gpio: Revert regression in sysfs-gpio (gpiolib.c)" 2022-04-08 14:39:48 +02:00
gpu drm/panel: simple: Fix Innolux G070Y2-L01 BPP settings 2022-03-23 09:13:28 +01:00
greybus
hid HID: logitech-dj: add new lightspeed receiver id 2022-04-08 14:39:47 +02:00
hsi HSI: core: Fix return freed object in hsi_new_client 2022-01-27 10:54:12 +01:00
hv hv: utils: add PTP_1588_CLOCK to Kconfig to fix build 2022-04-08 14:39:46 +02:00
hwmon hwmon: (pmbus) Clear pmbus fault/warning bits after read 2022-03-16 14:16:00 +01:00
hwspinlock
hwtracing coresight: cti: Correct the parameter for pm_runtime_put 2021-11-18 14:03:51 +01:00
i2c i2c: qup: allow COMPILE_TEST 2022-03-08 19:09:30 +01:00
i3c
ide
idle
iio iio: Fix error handling for PM 2022-03-02 11:42:53 +01:00
infiniband RDMA/cma: Do not change route.addr.src_addr outside state checks 2022-03-02 11:42:56 +01:00
input Input: zinitix - do not report shadow fingers 2022-04-08 14:39:48 +02:00
interconnect treewide: Change list_sort to use const pointers 2021-09-30 10:11:04 +02:00
iommu iommu/amd: Recover from event log overflow 2022-03-08 19:09:31 +01:00
ipack ipack: ipoctal: fix module reference leak 2021-10-06 15:56:01 +02:00
irqchip irqchip/sifive-plic: Add missing thead,c900-plic match string 2022-02-23 12:01:05 +01:00
isdn isdn: hfcpci: check the return value of dma_set_mask() in setup_hw() 2022-03-16 14:15:57 +01:00
leds
lightnvm
macintosh
mailbox soc: mediatek: cmdq: add address shift in jump 2021-09-18 13:40:16 +02:00
mcb mcb: fix error handling in mcb_alloc_bus() 2021-09-30 10:11:00 +02:00
md dm: fix alloc_dax error handling in alloc_dev 2022-01-27 10:54:22 +01:00
media media: venus: core: Drop second v4l2 device unregister 2022-02-01 17:25:38 +01:00
memory memory: renesas-rpc-if: Return error in case devm_ioremap_resource() fails 2022-01-27 10:53:48 +01:00
memstick memstick: jmb38x_ms: use appropriate free function in jmb38x_ms_alloc_host() 2021-11-18 14:04:07 +01:00
message
mfd mfd: atmel-flexcom: Use .resume_noirq 2022-01-27 10:53:51 +01:00
misc eeprom: ee1004: limit i2c reads to I2C_SMBUS_BLOCK_MAX 2022-02-16 12:54:27 +01:00
mmc mmc: meson: Fix usage of meson_mmc_post_req() 2022-03-16 14:16:01 +01:00
most most: fix control-message timeouts 2021-11-18 14:03:51 +01:00
mtd mtd: rawnand: brcmnand: Fixed incorrect sub-page ECC status 2022-02-23 12:01:04 +01:00
mux
net net:mcf8390: Use platform_get_irq() to get the interrupt 2022-04-08 14:39:48 +02:00
nfc nfc: st21nfca: Fix potential buffer overflows in EVT_TRANSACTION 2022-03-28 09:57:07 +02:00
ntb ntb: intel: fix port config status offset for SPR 2022-03-08 19:09:32 +01:00
nubus
nvdimm libnvdimm/pmem: Fix crash triggered when I/O in-flight during unbind 2021-09-18 13:40:36 +02:00
nvme nvme-rdma: fix possible use-after-free in transport error_recovery work 2022-02-23 12:01:00 +01:00
nvmem nvmem: core: set size for sysfs bin file 2022-01-27 10:54:22 +01:00
of of: base: Improve argument length mismatch error 2022-01-27 10:54:28 +01:00
opp opp: Fix return in _opp_add_static_v2() 2021-11-18 14:04:22 +01:00
oprofile
parisc parisc: Fix sglist access in ccio-dma.c 2022-02-23 12:00:57 +01:00
parport parport: remove non-zero check on count 2021-09-18 13:40:34 +02:00
pci PCI: hv: Fix NUMA node assignment when kernel boots with custom NUMA topology 2022-02-23 12:00:57 +01:00
pcmcia pcmcia: fix setting of kthread task states 2022-01-27 10:54:03 +01:00
perf
phy phy: usb: Leave some clocks running during suspend 2022-02-23 12:01:05 +01:00
pinctrl pinctrl: sunxi: Use unique lockdep classes for IRQs 2022-03-08 19:09:36 +01:00
platform surface: surface3_power: Fix battery readings on batteries without a serial number 2022-03-02 11:42:51 +01:00
pnp
power power: reset: mt6397: Check for null res pointer 2022-01-27 10:54:00 +01:00
powercap
pps
ps3
ptp ptp_pch: Load module automatically if ID matches 2021-10-13 10:04:27 +02:00
pwm pwm: stm32-lp: Don't modify HW state in .remove() callback 2021-09-26 14:09:01 +02:00
rapidio
ras
regulator regulator: core: fix false positive in regulator_late_cleanup() 2022-03-08 19:09:29 +01:00
remoteproc remoteproc: qcom: pil_info: Don't memcpy_toio more than is provided 2022-01-20 09:17:50 +01:00
reset reset: socfpga: add empty driver allowing consumers to probe 2021-11-18 14:03:42 +01:00
rpmsg rpmsg: char: Fix race between the release of rpmsg_eptdev and cdev 2022-02-01 17:25:43 +01:00
rtc rtc: cmos: Evaluate century appropriate 2022-02-08 18:30:39 +01:00
s390 scsi: zfcp: Fix failed recovery on gone remote port with non-NPIV FCP devices 2022-02-01 17:25:39 +01:00
sbus
scsi scsi: mpt3sas: Page fault in reply q processing 2022-03-23 09:13:29 +01:00
sfi
sh maple: fix wrong return value of maple_bus_init(). 2021-11-26 10:39:12 +01:00
siox
slimbus
soc soc: fsl: qe: Check of ioremap return value 2022-03-08 19:09:37 +01:00
soundwire soundwire: debugfs: use controller id and link_id for debugfs 2021-11-18 14:04:16 +01:00
spi spi: Fix erroneous sgs value with min_t() 2022-04-08 14:39:48 +02:00
spmi
ssb
staging staging: fbtft: fb_st7789v: reset display before initialization 2022-03-28 09:57:08 +02:00
target scsi: target: iscsi: Make sure the np under each tpg is unique 2022-02-16 12:54:19 +01:00
tc
tee optee: use driver internal tee_context for some rpc 2022-03-02 11:42:47 +01:00
thermal thermal: core: Fix TZ_GET_TRIP NULL pointer dereference 2022-03-08 19:09:32 +01:00
thunderbolt thunderbolt: Runtime PM activate both ends of the device link 2022-01-27 10:54:14 +01:00
tty serial: stm32: prevent TDR register overwrite when sending x_char 2022-03-08 19:09:30 +01:00
uio
usb USB: serial: simple: add Nokia phone driver 2022-04-08 14:39:46 +02:00
vdpa vdpa/mlx5: should verify CTRL_VQ feature exists for MQ 2022-04-08 14:39:47 +02:00
vfio vfio: Use config not menuconfig for VFIO_NOIOMMU 2021-09-18 13:40:12 +02:00
vhost vsock: each transport cycles only on its own sockets 2022-03-23 09:13:27 +01:00
video fbcon: Add option to enable legacy hardware acceleration 2022-02-08 18:30:40 +01:00
virt
virtio virtio: acknowledge all features before access 2022-03-16 14:16:02 +01:00
visorbus
vlynq
vme
w1 w1: Misuse of get_user()/put_user() reported by sparse 2022-01-27 10:54:22 +01:00
watchdog ar7: fix kernel builds for compiler test 2021-11-18 14:04:24 +01:00
xen xen/gnttab: fix gnttab_end_foreign_access() without page specified 2022-03-11 12:11:54 +01:00
zorro
Kconfig
Makefile