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/linux/Documentation/driver-api/
H A Dspi.rst7 often in the range of 1-20 MHz), a "Master Out, Slave In" (MOSI) data
8 line, and a "Master In, Slave Out" (MISO) data line. SPI is a full
12 additional chipselect line is usually active-low (nCS); four signals are
18 only "master" side interfaces are supported, where Linux talks to SPI
25 a pair of FIFOs connected to dual DMA engines on the other side of the
28 the SPI side of their device as a :c:type:`struct spi_controller
29 <spi_controller>`. SPI devices are children of that master,
33 board-specific initialization code. A :c:type:`struct spi_driver
46 .. kernel-doc:: include/linux/spi/spi.h
49 .. kernel-doc:: drivers/spi/spi.c
[all …]
H A Di2c.rst5 the "Inter-IC" bus, a simple bus protocol which is widely used where low
7 some vendors use another name (such as "Two-Wire Interface", TWI) for
12 I2C is a multi-master bus; open drain signaling is used to arbitrate
16 The Linux I2C programming interfaces support the master side of bus
17 interactions and the slave side. The programming interface is
38 .. kernel-doc:: include/linux/i2c.h
41 .. kernel-doc:: drivers/i2c/i2c-boardinfo.c
44 .. kernel-doc:: drivers/i2c/i2c-core-base.c
47 .. kernel-doc:: drivers/i2c/i2c-core-smbus.c
/linux/Documentation/devicetree/bindings/i2c/
H A Di2c-arb-gpio-challenge.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-arb-gpio-challenge.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
10 - Doug Anderson <dianders@chromium.org>
11 - Peter Rosin <peda@axentia.se>
15 the master of an I2C bus in a multimaster situation.
18 standard I2C multi-master rules. Using GPIOs is generally useful in the case
25 problems (hard to tell if i2c issues were caused by one master, another,
[all …]
/linux/arch/arm/mach-at91/
H A Dpm_suspend.S1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm/mach-at91/pm_slow_clock.S
13 #include "pm_data-offsets.h"
16 .arch armv7-a
28 * Wait until master clock is ready (after switching master clock source)
30 * @r_mckid: register holding master clock identifier
32 * Side effects: overwrites r7, r8
49 * Wait until master oscillator has stabilized.
51 * Side effects: overwrites r7
62 * Side effects: overwrites r7
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/linux/include/uapi/linux/hdlc/
H A Dioctl.h1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
9 #define CLOCK_EXT 1 /* External TX and RX clock - DTE */
10 #define CLOCK_INT 2 /* Internal TX and RX clock - DCE */
27 #define PARITY_CRC16_PR0_CCITT 4 /* CRC16, initial 0x0000, ITU-T version */
28 #define PARITY_CRC16_PR1_CCITT 5 /* CRC16, initial 0xFFFF, ITU-T version */
35 #define LMI_CCITT 3 /* ITU-T Annex A */
42 unsigned int clock_type; /* internal, external, TX-internal etc. */
48 unsigned int clock_type; /* internal, external, TX-internal etc. */
65 unsigned short dce; /* 1 for DCE (network side) operation */
74 char master[IFNAMSIZ]; /* Name of master FRAD device */ member
[all …]
/linux/drivers/tty/
H A Dpty.c1 // SPDX-License-Identifier: GPL-2.0
5 * Added support for a Unix98-style ptmx device.
6 * -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
49 if (tty->driver->subtype == PTY_TYPE_MASTER) in pty_close()
50 WARN_ON(tty->count > 1); in pty_close()
54 if (tty->count > 2) in pty_close()
57 set_bit(TTY_IO_ERROR, &tty->flags); in pty_close()
58 wake_up_interruptible(&tty->read_wait); in pty_close()
59 wake_up_interruptible(&tty->write_wait); in pty_close()
60 spin_lock_irq(&tty->ctrl.lock); in pty_close()
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/linux/Documentation/admin-guide/
H A Ddevices.rst11 version in the mainline Linux kernel is the master document. Updates
13 :ref:`Documentation/process/submitting-patches.rst <submittingpatches>` document).
63 --------------------------------------
81 /dev/nfsd socksys symbolic Required by iBCS-2
82 /dev/X0R null symbolic Required by iBCS-2
85 Note: ``/dev/X0R`` is <letter X>-<digit 0>-<letter R>.
100 /dev/scd? sr? hard Alternate SCSI CD-ROM name
114 /dev/cdrom CD-ROM device symbolic Current CD-ROM device
115 /dev/cdwriter CD-writer symbolic Current CD-writer device
138 Non-transient sockets and named pipes may exist in /dev. Common entries are:
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/linux/sound/pci/ca0106/
H A Dca0106_mixer.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2004 James Courtier-Dutton <James@superbug.demon.co.uk>
67 if (emu->spdif_enable) { in ca0106_spdif_enable()
73 val = inl(emu->port + CA0106_GPIO) & ~0x101; in ca0106_spdif_enable()
74 outl(val, emu->port + CA0106_GPIO); in ca0106_spdif_enable()
82 val = inl(emu->port + CA0106_GPIO) | 0x101; in ca0106_spdif_enable()
83 outl(val, emu->port + CA0106_GPIO); in ca0106_spdif_enable()
89 unsigned int val = emu->capture_source; in ca0106_set_capture_source()
103 ngain = emu->i2c_capture_volume[val][0]; /* Left */ in ca0106_set_i2c_capture_source()
104 ogain = emu->i2c_capture_volume[emu->i2c_capture_source][0]; /* Left */ in ca0106_set_i2c_capture_source()
[all …]
/linux/Documentation/i2c/
H A Dgpio-fault-injection.rst5 The GPIO based I2C bus master driver can be configured to provide fault
7 which is driven by the I2C bus master driver under test. The GPIO fault
9 master driver should handle gracefully.
12 'i2c-fault-injector' subdirectory in the Kernel debugfs filesystem, usually
15 injection. They will be described now along with their intended use-cases.
21 -----
26 because the bus master under test will not be able to clock. It should detect
31 -----
36 master under test should detect this condition and trigger a bus recovery (see
48 there are I2C client devices which detect a stuck SDA on their side and release
[all …]
/linux/arch/um/drivers/
H A Dpty.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
34 *data = ((struct pty_chan) { .announce = opts->announce, in pty_chan_init()
36 .raw = opts->raw }); in pty_chan_init()
49 err = -errno; in pts_open()
54 if (data->raw) { in pts_open()
55 CATCH_EINTR(err = tcgetattr(fd, &data->tt)); in pts_open()
65 sprintf(data->dev_name, "%s", dev); in pts_open()
66 *dev_out = data->dev_name; in pts_open()
68 if (data->announce) in pts_open()
[all …]
/linux/include/drm/
H A Ddrm_audio_component.h1 // SPDX-License-Identifier: MIT
14 * struct drm_audio_component_ops - Ops implemented by DRM driver, called by hda driver
68 * struct drm_audio_component_audio_ops - Ops implemented by hda driver, called by DRM driver
88 * number to a port number in the graphics side.
92 * @master_bind: (Optional) component master bind callback
94 * Called at binding master component, for HDA codec-specific
99 * @master_unbind: (Optional) component master unbind callback
101 * Called at unbinding master component, for HDA codec-specific
108 * struct drm_audio_component - Used for direct communication between DRM and hda drivers
124 * @master_bind_complete: completion held during component master binding
/linux/sound/ppc/
H A Dsnd_ps3_reg.h1 /* SPDX-License-Identifier: GPL-2.0-only */
73 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
75 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
96 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
98 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
106 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
108 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
125 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
127 +-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+
131 #define PS3_AUDIO_AX_MCTRL_ASOMT(n) (1 << (3 - (n))) /* RWIVF */
[all …]
/linux/Documentation/trace/
H A Dstm.rst1 .. SPDX-License-Identifier: GPL-2.0
10 which is assigned a unique pair of master and channel. While some of
14 master/channel combination from this pool.
16 On the receiving end of this STP stream (the decoder side), trace
17 sources can only be identified by master/channel combination, so in
20 master/channel pairs to the trace sources that it understands.
23 master 7 channel 15, while arbitrary user applications can use masters
34 associated with it, located in "stp-policy" subsystem directory in
40 $ ls /config/stp-policy/dummy_stm.my-policy/user
42 $ cat /config/stp-policy/dummy_stm.my-policy/user/masters
[all …]
/linux/Documentation/sound/designs/
H A Dcontrol-names.rst8 ---------------
39 Side side left/right for 7.1 surround
54 Master
55 Master Mono
56 Hardware Master
68 Headset Mic mic part of combined headset jack - 4-pin
70 Headphone Mic mic part of either/or - 3-pin headphone or mic
79 Analog Loopback D/A -> A/D loopback
80 Digital Loopback playback -> capture loopback -
98 -----------------------
[all …]
/linux/Documentation/spi/
H A Dspi-lm70llp.rst2 spi_lm70llp : LM70-LLP parport-to-SPI adapter
15 -----------
19 This is a SPI master controller driver. It can be used in conjunction with
27 --------------------
28 The schematic for this particular board (the LM70EVAL-LLP) is
39 D0 2 - -
40 D1 3 --> V+ 5
41 D2 4 --> V+ 5
42 D3 5 --> V+ 5
43 D4 6 --> V+ 5
[all …]
/linux/sound/soc/generic/
H A Daudio-graph-card2-custom-sample.dtsi1 // SPDX-License-Identifier: GPL-2.0
3 * audio-graph-card2-custom-sample.dtsi
8 * This sample indicates how to use audio-graph-card2 and its
9 * custom driver. "audio-graph-card2-custom-sample" is the custome driver
10 * which is using audio-graph-card2.
15 * #include "../../../../../sound/soc/generic/audio-graph-card2-custom-sample.dtsi"
23 * "compatible" on each test-component. see below
26 * - compatible = "test-cpu";
27 * + compatible = "test-cpu-verbose";
32 * - compatible = "test-codec";
[all …]
/linux/Documentation/driver-api/usb/
H A Dgadget.rst11 This document presents a Linux-USB "Gadget" kernel mode API, for use
17 - Supports USB 2.0, for high speed devices which can stream data at
20 - Handles devices with dozens of endpoints just as well as ones with
21 just two fixed-function ones. Gadget drivers can be written so
24 - Flexible enough to expose more complex USB device capabilities such
28 - USB "On-The-Go" (OTG) support, in conjunction with updates to the
29 Linux-USB host side.
31 - Sharing data structures and API models with the Linux-USB host side
32 API. This helps the OTG support, and looks forward to more-symmetric
34 side drivers).
[all …]
/linux/Documentation/driver-api/acpi/
H A Dlinuxized-acpica.rst1 .. SPDX-License-Identifier: GPL-2.0
5 Linuxized ACPICA - Introduction to ACPICA Release Automation
8 :Copyright: |copy| 2013-2016, Intel Corporation
24 system (OS)-independent reference implementation of the Advanced
36 +---------------------------------------------------------+
38 | +---------------------------------------------------+ |
39 | | +------------------+ | |
41 | | +------------------+ | |
42 | | +----------------------+ | |
44 | | +----------------------+ | |
[all …]
/linux/Documentation/driver-api/soundwire/
H A Derror_handling.rst13 1. Bus clash or parity errors: This mechanism relies on low-level detectors
20 impact its audibility (most-significant bits will be more impacted in PCM),
34 be applied. In case of a bad programming (command sent to non-existent
35 Slave or to a non-implemented register) or electrical issue, no response
36 signals the command was ignored. Some Master implementations allow for a
40 reset and re-enumerate all devices.
47 driver will return a -ETIMEOUT. Such timeouts are symptoms of a faulty
56 problems when enabling multiple bus segments (a command with side effects
58 hard-reset might be the best solution.
62 that the Slave might behave in implementation-defined ways. The bus
[all …]
/linux/Documentation/devicetree/bindings/net/
H A Dmdio-mux.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/net/mdio-mux.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Andrew Lunn <andrew@lunn.ch>
18 mdio-parent-bus:
21 The phandle of the MDIO bus that this multiplexer's master-side port is
24 '#address-cells':
27 '#size-cells':
31 '^mdio@[0-9a-f]+$':
/linux/drivers/gpu/drm/msm/
H A DNOTES5 + MDP3 - ?? seems to be what is on geeksphone peak device
6 + MDP4 - S3 (APQ8060, touchpad), S4-pro (APQ8064, nexus4 & ifc6410)
7 + MDP5 - snapdragon 800
14 And on gpu side of things:
20 with N different kms devices from xf86-video-freedreno. Plus, it
27 And one or more 'struct msm_gpu' for the various different gpu sub-
38 plane -> PIPE{RGBn,VGn} \
39 crtc -> OVLP{n} + DMA{P,S,E} (??) |-> MDP "device"
40 encoder -> DTV/LCDC/DSI (within MDP4) /
41 connector -> HDMI/DSI/etc --> other device(s)
[all …]
/linux/Documentation/filesystems/
H A Dubifs-authentication.rst1 .. SPDX-License-Identifier: GPL-2.0
24 binary to perform a malicious action when executed [DMC-CBC-ATTACK]. Since
28 Other full disk encryption systems like dm-crypt cover all filesystem metadata,
31 time. For dm-crypt and other filesystems that build upon the Linux block IO
32 layer, the dm-integrity or dm-verity subsystems [DM-INTEGRITY, DM-VERITY]
34 These can also be combined with dm-crypt [CRYPTSETUP2].
44 ----------------
50 addition, it deals with flash-specific wear-leveling and transparent I/O error
60 +------------+ +*******+ +-----------+ +-----+
61 | | * UBIFS * | UBI-BLOCK | | ... |
[all …]
H A Dfscrypt.rst2 Filesystem-level encryption (fscrypt)
11 Note: "fscrypt" in this document refers to the kernel-level portion,
14 covers the kernel-level portion. For command-line examples of how to
20 <https://source.android.com/security/encryption/file-based>`_, over
25 Unlike dm-crypt, fscrypt operates at the filesystem level rather than
28 filesystem. This is useful for multi-user systems where each user's
29 data-at-rest needs to be cryptographically isolated from the others.
34 directly into supported filesystems --- currently ext4, F2FS, UBIFS,
44 fscrypt does not support encrypting files in-place. Instead, it
54 ---------------
[all …]
/linux/drivers/i3c/master/
H A Dsvc-i3c-master.c1 // SPDX-License-Identifier: GPL-2.0
3 * Silvaco dual-role I3C master driver
14 #include <linux/i3c/master.h>
24 /* Master Mode Registers */
162 * struct svc_i3c_master - Silvaco I3C Master structure
163 * @base: I3C master controller
170 * @hj_work: Hot-join work
185 * @lock: Transfer lock, protect between IBI work thread and callbacks from master
222 * struct svc_i3c_i2c_dev_data - Device specific data
223 * @index: Index in the master tables corresponding to this device
[all …]
/linux/sound/pci/ice1712/
H A Dphase.c1 // SPDX-License-Identifier: GPL-2.0-or-later
11 * Audio controller: VIA Envy24HT-S (slightly trimmed down Envy24HT, 4in/4out)
13 * Digital receiver: CS8414-CS (supported in this release)
18 * - CS directly from GPIO 10
19 * - CCLK via 74HCT125's gate #4 from GPIO 4
20 * - CDTI via 74HCT125's gate #2 from GPIO 5
28 * Digital receiver: CS8414-CS (supported in this release)
46 unsigned short master[2]; member
51 #define WM_DAC_ATTEN 0x00 /* DAC1-8 analog attenuation */
52 #define WM_DAC_MASTER_ATTEN 0x08 /* DAC master analog attenuation */
[all …]

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