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linux/drivers/nfc
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Paul Geurts a9bc28aa4e NFC: trf7970a: Ignore antenna noise when checking for RF field 
The main channel Received Signal Strength Indicator (RSSI) measurement
is used to determine whether an RF field is present or not. RSSI != 0
is interpreted as an RF Field is present. This does not take RF noise
and measurement inaccuracy into account, and results in false positives
in the field.

Define a noise level and make sure the RF field is only interpreted as
present when the RSSI is above the noise level.

Fixes: 851ee3cbf8 ("NFC: trf7970a: Don't turn on RF if there is already an RF field")
Signed-off-by: Paul Geurts <paul.geurts@prodrive-technologies.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Link: https://patch.msgid.link/20260422100930.581237-1-paul.geurts@prodrive-technologies.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-04-27 18:00:43 -07:00
..
fdp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2023-06-22 18:40:38 -07:00
microread nfc: microread: Drop unused include 2026-03-23 17:41:01 -07:00
nfcmrvl nfc: nfcmrvl: refactor endpoint lookup 2026-03-31 19:24:30 -07:00
nxp-nci Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-03-19 14:16:00 -07:00
pn533 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-04-09 13:20:59 -07:00
pn544 NFC: pn544: i2c: Replace strcpy() with strscpy() 2026-03-03 17:12:46 -08:00
s3fwrn5 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2026-04-09 13:20:59 -07:00
st-nci treewide, timers: Rename from_timer() to timer_container_of() 2025-06-08 09:07:37 +02:00
st21nfca Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
st95hf nfc: st95hf: drop driver owner assignment 2024-03-29 12:32:51 -07:00
Kconfig
Makefile
mei_phy.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
mei_phy.h NFC: mei_phy: fix kernel-doc warnings 2025-11-17 19:32:32 -08:00
nfcsim.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
port100.c nfc: port100: refactor endpoint lookup 2026-03-31 19:24:30 -07:00
trf7970a.c NFC: trf7970a: Ignore antenna noise when checking for RF field 2026-04-27 18:00:43 -07:00
virtual_ncidev.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00