kernel/linux.git/drivers/input/touchscreen/tsc2007_core.c, branch v6.19.11

Input: tsc2007 - prevent overflow in pressure calculation

2025-09-03T14:44:00+00:00

The touch resistance calculation in the tsc2007 driver is prone to overflow if (z2 - z1) is large and also x is reasonably big. This overflow results in the driver emitting input events when very little touch pressure is applied. In these events the x and y coordinates can be substantially off. Avoid the overflow by using u64 when calculating resistance value. Signed-off-by: Johannes Kirchmair Link: https://lore.kernel.org/r/20250129-fix_tsc_calculation_overflow-v2-1-9e51333496ad@skidata.com Signed-off-by: Dmitry Torokhov

Input: tsc2007 - make interrupt optional

2025-09-03T13:59:13+00:00

In case tsc2007 is used as an ADC sensor there will be no interrupt provided at all, so set up an interrupt only if one is present. Signed-off-by: Svyatoslav Ryhel Link: https://lore.kernel.org/r/20250824091927.105121-3-clamor95@gmail.com Signed-off-by: Dmitry Torokhov

Input: tsc2007 - change warning to debug message if pen GPIO is not defined

2025-09-03T13:59:04+00:00

Since pen GPIO request is optional, there is no reason to throw dev_warn if such GPIO is not defined. Signed-off-by: Svyatoslav Ryhel Link: https://lore.kernel.org/r/20250824091927.105121-2-clamor95@gmail.com Signed-off-by: Dmitry Torokhov

Input: tsc2007 - accept standard properties

2024-12-11T00:17:30+00:00

Only some driver-specific properties were accepted, change it to use the now-available standard properties which are found in devicetrees containing this chip. Signed-off-by: Andreas Kemnade Acked-by: Dmitry Torokhov Link: https://lore.kernel.org/r/20241205204413.2466775-2-akemnade@kernel.org Signed-off-by: Kevin Hilman

Input: drop explicit initialization of struct i2c_device_id::driver_data to 0

2024-05-13T22:43:19+00:00

These drivers don't use the driver_data member of struct i2c_device_id, so don't explicitly initialize this member. This prepares putting driver_data in an anonymous union which requires either no initialization or named designators. But it's also a nice cleanup on its own. While add it, also remove commas after the sentinel entries. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20240509174158.2211071-2-u.kleine-koenig@pengutronix.de Signed-off-by: Dmitry Torokhov

Input: Switch i2c drivers back to use .probe()

2023-05-17T16:59:11+00:00

After commit b8a1a4cd5a98 ("i2c: Provide a temporary .probe_new() call-back type"), all drivers being converted to .probe_new() and then 03c835f498b5 ("i2c: Switch .probe() to not take an id parameter") convert back to (the new) .probe() to be able to eventually drop .probe_new() from struct i2c_driver. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20230517164645.162294-1-u.kleine-koenig@pengutronix.de Signed-off-by: Dmitry Torokhov

Input: tsc2007 - enable cansleep pendown GPIO

2023-04-03T04:37:49+00:00

When a hard IRQ is triggered, the soft IRQ, which decides if an actual pen down happened, should always be triggered. This enables the usage of "can_sleep" GPIO chips as "pen down" GPIO, as the value is not read during the hard IRQ anymore. This might be the case if the GPIO chip is an expander behind i2c. Signed-off-by: Benjamin Bara Signed-off-by: Richard Leitner Link: https://lore.kernel.org/r/20230328-tsc2007-sleep-v5-1-fc55e76d0ced@skidata.com Signed-off-by: Dmitry Torokhov

Input: tsc2007_core - Convert to i2c's .probe_new()

2022-12-02T22:53:47+00:00

.probe_new() doesn't get the i2c_device_id * parameter, so determine that explicitly in the probe function. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20221118224540.619276-264-uwe@kleine-koenig.org Signed-off-by: Dmitry Torokhov

Input: tsc2007 - make use of device properties

2021-03-16T00:12:04+00:00

Device property API allows to gather device resources from different sources, such as ACPI. Convert the drivers to unleash the power of device property API. Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20210314210951.645783-2-andy.shevchenko@gmail.com Signed-off-by: Dmitry Torokhov

Input: tsc2007 - convert to GPIO descriptors

2021-03-16T00:12:02+00:00

This converts the driver to use GPIO descriptors. Note that it now uses logical polarity and thus nagation has been dropped. Signed-off-by: Andy Shevchenko Link: https://lore.kernel.org/r/20210314210951.645783-1-andy.shevchenko@gmail.com Signed-off-by: Dmitry Torokhov