| /linux/Documentation/devicetree/bindings/iio/proximity/ |
| H A D | devantech-srf04.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/iio/proximity/devantech-srf04.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andreas Klinger <ak@it-klinger.de>
13 Bit-banging driver using two GPIOs:
14 - trigger-gpio is raised by the driver to start sending out an ultrasonic
16 - echo-gpio is held high by the sensor after sending ultrasonic burst
20 https://www.robot-electronics.co.uk/htm/srf04tech.htm
22 https://www.maxbotix.com/documents/LV-MaxSonar-EZ_Datasheet.pdf
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| H A D | parallax-ping.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/iio/proximity/parallax-ping.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andreas Klinger <ak@it-klinger.de>
13 Bit-banging driver using one GPIO:
14 - ping-gpios is raised by the driver to start measurement
15 - direction of ping-gpio is then switched into input with an interrupt
19 http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
20 http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
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| /linux/Documentation/devicetree/bindings/pps/ |
| H A D | pps-gpio.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/pps/pps-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Fabio Estevam <festevam@gmail.com>
14 const: pps-gpio
16 gpios:
20 echo-gpios:
21 description: The GPIO that provides the PPS ECHO signal.
24 echo-active-ms:
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| /linux/Documentation/admin-guide/gpio/ |
| H A D | gpio-aggregator.rst | 1 .. SPDX-License-Identifier: GPL-2.0-only
6 The GPIO Aggregator provides a mechanism to aggregate GPIOs, and expose them as
10 Aggregating GPIOs using Sysfs
11 -----------------------------
15 system permissions, on an all-or-nothing basis: either a GPIO controller is
18 The GPIO Aggregator provides access control for a set of one or more GPIOs, by
21 simplifies and hardens exporting GPIOs to a virtual machine, as the VM can just
22 grab the full GPIO controller, and no longer needs to care about which GPIOs to
26 write-only attribute files in sysfs.
28 /sys/bus/platform/drivers/gpio-aggregator/
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| H A D | gpio-virtuser.rst | 1 .. SPDX-License-Identifier: GPL-2.0-only
7 that request GPIOs and then control their behavior over debugfs. Virtual
8 consumer devices can be instantiated from device-tree or over configfs.
10 A virtual consumer uses the driver-facing GPIO APIs and allows to cover it with
11 automated tests driven by user-space. The GPIOs are requested using
12 ``gpiod_get_array()`` and so we support multiple GPIOs per connector ID.
15 -----------------------
17 The gpio-consumer module registers a configfs subsystem called
18 ``'gpio-virtuser'``. For details of the configfs filesystem, please refer to
25 **Group:** ``/config/gpio-virtuser``
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| /linux/drivers/iio/proximity/ |
| H A D | srf04.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * SRF04: ultrasonic sensor for distance measuring by using GPIOs
5 * Copyright (c) 2017 Andreas Klinger <ak@it-klinger.de>
8 * https://www.robot-electronics.co.uk/htm/srf04tech.htm
12 * +---+
14 * trig: --+ +------------------------------------------------------
16 * |<->|
19 * ultra +-+ +-+ +-+
21 * burst: ---------+ +-+ +-+ +-----------------------------------------
23 * ultra . +-+ +-+ +-+
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| H A D | ping.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * PING: ultrasonic sensor for distance measuring by using only one GPIOs
5 * Copyright (c) 2019 Andreas Klinger <ak@it-klinger.de>
8 * http://parallax.com/sites/default/files/downloads/28041-LaserPING-2m-Rangefinder-Guide.pdf
9 * http://parallax.com/sites/default/files/downloads/28015-PING-Documentation-v1.6.pdf
16 * |<->| interrupt interrupt
18 * |<---------------------->|
20 * . --> one round trip of ultra sonic waves
27 * echo: __________________________________/ \_/ \_/ \________________
80 if (gpiod_get_value(data->gpiod_ping)) { in ping_handle_irq()
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| /linux/Documentation/userspace-api/gpio/ |
| H A D | sysfs.rst | 6 been moved to Documentation/ABI/obsolete/sysfs-gpio.
16 ----------------------
18 configure a sysfs user interface to GPIOs. This is different from the
27 then changing its output state, then updating the code before re-enabling
38 Please read Documentation/driver-api/gpio/drivers-on-gpio.rst
44 --------------
47 - Control interfaces used to get userspace control over GPIOs;
49 - GPIOs themselves; and
51 - GPIO controllers ("gpio_chip" instances).
55 The control interfaces are write-only:
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| /linux/Documentation/misc-devices/ |
| H A D | c2port.rst | 1 .. SPDX-License-Identifier: GPL-2.0
23 --------
26 C2 Interface used for in-system programming of micro controllers.
28 By using this driver you can reprogram the in-system flash without EC2
30 where the micro controller is connected via special GPIOs pins.
33 ----------
38 - AN127: FLASH Programming via the C2 Interface at
41 - C2 Specification at
45 banging) designed to enable in-system programming, debugging, and
46 boundary-scan testing on low pin-count Silicon Labs devices. Currently
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| /linux/Documentation/driver-api/ |
| H A D | pps.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 PPS - Pulse Per Second
22 --------
32 Carrier Detect pin) or to a parallel port (ACK-pin) or to a special
33 CPU's GPIOs (this is the common case in embedded systems) but in each
38 GPS receiver as PPS source, to obtain a wallclock-time with
39 sub-millisecond synchronisation to UTC.
43 ------------------
46 CPU GPIO-Pin as physical link to the signal, I encountered a deeper
56 purpose GPIO line. In this case even basic file-related functionality
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| H A D | pin-control.rst | 9 - 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,
17 Top-level interface
22 - A PIN CONTROLLER is a piece of hardware, usually a set of registers, that
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
60 .. code-block:: c
97 See ``arch/arm/mach-ux500/Kconfig`` for an example.
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| /linux/arch/arm/boot/dts/ti/omap/ |
| H A D | omap3-echo.dts | 1 // SPDX-License-Identifier: GPL-2.0-only
5 /dts-v1/;
9 #include <dt-bindings/input/input.h>
10 #include <dt-bindings/leds/common.h>
13 model = "Amazon Echo (first generation)";
14 compatible = "amazon,omap3-echo", "ti,omap3630", "ti,omap3";
18 cpu0-supply = <&vdd1_reg>;
28 compatible = "regulator-fixed";
29 regulator-name = "vcc5v";
30 regulator-min-microvolt = <5000000>;
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| /linux/arch/powerpc/platforms/ |
| H A D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0
36 bool "ePAPR para-virtualization support"
38 Enables ePAPR para-virtualization support for guests.
47 a hypervisor. This option is not user-selectable but should
64 bool "Device-tree based CPU feature discovery & setup"
109 e.g. "echo 5 > /sys/devices/system/mpic/timer_wakeup"
123 registers are used for inter-processor communication.
205 bool "On-chip CPU temperature sensor support"
208 G3 and G4 processors have an on-chip temperature sensor called the
209 'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
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| /linux/drivers/gpio/ |
| H A D | TODO | 1 This is a place for planning the ongoing long-term work in the GPIO
8 to move away from the global GPIO numberspace and toward a descriptor-based
18 establish the numberspace at compile-time, making it hard to add any numbers
26 The runtime-assigned GPIO numberspace (what you get if you assign the GPIO
27 base as -1 in struct gpio_chip) has also became unpredictable due to factors
28 such as probe ordering and the introduction of -EPROBE_DEFER making probe
37 - Convert all GPIO device drivers to only #include <linux/gpio/driver.h>
39 - Convert all consumer drivers to only #include <linux/gpio/consumer.h>
41 - Convert all machine descriptors in "boardfiles" to only
46 - When this work is complete (will require some of the items in the
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| /linux/Documentation/hwmon/ |
| H A D | ltc4245.rst | 10 Addresses scanned: 0x20-0x3f
20 -----------
28 -----------
38 $ echo ltc4245 0x23 > /sys/bus/i2c/devices/i2c-1/new_device
42 -------------
44 The LTC4245 has built-in limits for over and under current warnings. This
48 into the values specified in the sysfs-interface document. The current readings
55 in4_input Vee (-12v) input voltage (mV)
60 in4_min_alarm Vee (-12v) input undervoltage alarm
65 curr4_input Vee (-12v) current (mA)
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| /linux/drivers/fsi/ |
| H A D | fsi-master-ast-cf.c | 1 // SPDX-License-Identifier: GPL-2.0+
25 #include "fsi-master.h"
26 #include "cf-fsi-fw.h"
28 #define FW_FILE_NAME "cf-fsi-fw.bin"
132 msg->msg <<= bits; in msg_push_bits()
133 msg->msg |= data & ((1ull << bits) - 1); in msg_push_bits()
134 msg->bits += bits; in msg_push_bits()
142 top = msg->bits & 0x3; in msg_push_crc()
144 /* start bit, and any non-aligned top bits */ in msg_push_crc()
145 crc = crc4(0, 1 << top | msg->msg >> (msg->bits - top), top + 1); in msg_push_crc()
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| /linux/drivers/net/can/dev/ |
| H A D | dev.c | 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
4 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
13 #include <linux/can/can-ml.h>
24 if (new_state <= priv->state) in can_update_state_error_stats()
29 priv->can_stats.error_warning++; in can_update_state_error_stats()
32 priv->can_stats.error_passive++; in can_update_state_error_stats()
35 priv->can_stats.bus_off++; in can_update_state_error_stats()
110 *tx_state = can_state_err_to_state(bec->txerr); in can_state_get_by_berr_counter()
111 *rx_state = can_state_err_to_state(bec->rxerr); in can_state_get_by_berr_counter()
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| /linux/drivers/spi/ |
| H A D | spi-lantiq-ssc.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011-2015 Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
4 * Copyright (C) 2016 Hauke Mehrtens <hauke@hauke-m.de>
71 #define LTQ_SPI_CON_EM BIT(24) /* Echo mode */
142 #define LTQ_SPI_RXCNT_TODO_M 0xFFFF /* Recevie to-do value */
191 return __raw_readl(spi->regbase + reg); in lantiq_ssc_readl()
197 __raw_writel(val, spi->regbase + reg); in lantiq_ssc_writel()
203 u32 val = __raw_readl(spi->regbase + reg); in lantiq_ssc_maskl()
207 __raw_writel(val, spi->regbase + reg); in lantiq_ssc_maskl()
212 const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg; in tx_fifo_level()
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| /linux/drivers/platform/x86/ |
| H A D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0-only
12 x86 platforms, including vendor-specific laptop extension drivers.
23 This driver adds support for the ACPI-WMI (Windows Management
26 ACPI-WMI is a proprietary extension to ACPI to expose parts of the
27 ACPI firmware to userspace - this is done through various vendor
38 any ACPI-WMI devices.
45 Say Y here if you want to be able to read a firmware-embedded
50 be called wmi-bmof.
62 control, fn-lock, mic-mute LED, and other extra features.
65 will be called huawei-wmi.
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| /linux/drivers/net/ethernet/freescale/ |
| H A D | fec_main.c | 1 // SPDX-License-Identifier: GPL-2.0+
17 * Copyright (c) 2001-2005 Greg Ungerer (gerg@snapgear.com)
20 * Copyright (c) 2004-2006 Macq Electronique SA.
22 * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
194 { .compatible = "fsl,imx25-fec", .data = &fec_imx25_info, },
195 { .compatible = "fsl,imx27-fec", .data = &fec_imx27_info, },
196 { .compatible = "fsl,imx28-fec", .data = &fec_imx28_info, },
197 { .compatible = "fsl,imx6q-fec", .data = &fec_imx6q_info, },
198 { .compatible = "fsl,mvf600-fec", .data = &fec_mvf600_info, },
199 { .compatible = "fsl,imx6sx-fec", .data = &fec_imx6x_info, },
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| /linux/drivers/isdn/hardware/mISDN/ |
| H A D | hfcmulti.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * hfcmulti.c low level driver for hfc-4s/hfc-8s/hfc-e1 based cards
7 * Peter Sprenger (sprengermoving-bytes.de)
9 * inspired by existing hfc-pci driver:
10 * Copyright 1999 by Werner Cornelius (werner@isdn-development.de)
22 * Bit 0-7 = 0x00001 = HFC-E1 (1 port)
23 * or Bit 0-7 = 0x00004 = HFC-4S (4 ports)
24 * or Bit 0-7 = 0x00008 = HFC-8S (8 ports)
26 * Bit 9 = 0x00200 = Disable DTMF detect on all B-channels via hardware
38 * example: 0x20204 one HFC-4S with dtmf detection and 128 timeslots on PCM
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