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/linux/Documentation/userspace-api/media/v4l/
H A Ddev-touch.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
10 ``/dev/v4l-touch0`` to ``/dev/v4l-touch255`` with major number 81 and
20 side-channel for diagnostics or tuning. In other systems, the ASIC is a simple
26 lines, or tx/rx). Mutual Capacitance measured is at the nodes where the
27 conductors cross. Alternatively, Self Capacitance measures the signal from each
30 A touch input may be determined by comparing the raw capacitance measurement to
31 a no-touch reference (or "baseline") measurement:
33 Delta = Raw - Reference
35 The reference measurement takes account of variations in the capacitance across
51 :ref:`Touch Formats <tch-formats>`.
/linux/Documentation/devicetree/bindings/input/
H A Diqs269a.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jeff LaBundy <jeff@labundy.com>
13 - $ref: input.yaml#
16 The Azoteq IQS269A is an 8-channel capacitive touch controller that features
17 additional Hall-effect and inductive sensing capabilities.
24 - azoteq,iqs269a
25 - azoteq,iqs269a-00
26 - azoteq,iqs269a-d0
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H A Diqs626a.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jeff LaBundy <jeff@labundy.com>
13 The Azoteq IQS626A is a 14-channel capacitive touch controller that features
14 additional Hall-effect and inductive sensing capabilities.
19 - $ref: touchscreen/touchscreen.yaml#
31 "#address-cells":
34 "#size-cells":
37 azoteq,suspend-mode:
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H A Dazoteq,iqs7222.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jeff LaBundy <jeff@labundy.com>
21 - azoteq,iqs7222a
22 - azoteq,iqs7222b
23 - azoteq,iqs7222c
24 - azoteq,iqs7222d
29 irq-gpios:
32 Specifies the GPIO connected to the device's active-low RDY output.
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/linux/Documentation/devicetree/bindings/input/touchscreen/
H A Dazoteq,iqs7211.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jeff LaBundy <jeff@labundy.com>
13 The Azoteq IQS7210A, IQS7211A and IQS7211E trackpad and touchscreen control-
14 lers employ projected-capacitance sensing and can track two contacts.
21 - azoteq,iqs7210a
22 - azoteq,iqs7211a
23 - azoteq,iqs7211e
28 irq-gpios:
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/linux/drivers/input/mouse/
H A Dcyapa_gen5.c6 * Copyright (C) 2014-2015 Cypress Semiconductor, Inc.
21 #include <linux/crc-itu-t.h>
33 #define CYAPA_TSG_IMG_MAX_RECORDS (CYAPA_TSG_IMG_END_ROW_NUM - \
141 * Bit 7 - 3: reserved
142 * Bit 2 - 0: touch type;
146 * 3 - 15 : reserved.
154 * Bit 6 - 5: indicates an event associated with this touch instance
159 * Bit 4 - 0: An arbitrary ID tag associated with a finger
164 /* Bit 7 - 0 of X-axis coordinate of the touch in pixel. */
167 /* Bit 15 - 8 of X-axis coordinate of the touch in pixel. */
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/linux/Documentation/driver-api/
H A Dpin-control.rst9 - Enumerating and naming controllable pins
11 - Multiplexing of pins, pads, fingers (etc) see below for details
13 - Configuration of pins, pads, fingers (etc), such as software-controlled
14 biasing and driving mode specific pins, such as pull-up, pull-down, open drain,
15 load capacitance etc.
17 Top-level interface
22 - A PIN CONTROLLER is a piece of hardware, usually a set of registers, that
23 can control PINs. It may be able to multiplex, bias, set load capacitance,
26 - PINS are equal to pads, fingers, balls or whatever packaging input or
30 be sparse - i.e. there may be gaps in the space with numbers where no
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/linux/drivers/usb/musb/
H A Dmusb_core.c1 // SPDX-License-Identifier: GPL-2.0
6 * Copyright (C) 2005-2006 by Texas Instruments
7 * Copyright (C) 2006-2007 Nokia Corporation
11 * Inventra (Multipoint) Dual-Role Controller Driver for Linux.
15 * in the works. These are normal Linux-USB controller drivers which
29 * - Lack of host-side transaction scheduling, for all transfer types.
35 * includes DaVinci EVM in a common non-OTG mode.
59 * - Kconfig for everything user-configurable
60 * - platform_device for addressing, irq, and platform_data
61 * - platform_data is mostly for board-specific information
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